2 * Matroska file demuxer
3 * Copyright (c) 2003-2008 The FFmpeg Project
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * Matroska file demuxer
25 * @author Ronald Bultje <rbultje@ronald.bitfreak.net>
26 * @author with a little help from Moritz Bunkus <moritz@bunkus.org>
27 * @author totally reworked by Aurelien Jacobs <aurel@gnuage.org>
28 * @see specs available on the Matroska project page: http://www.matroska.org/
36 #include "libavutil/avstring.h"
37 #include "libavutil/base64.h"
38 #include "libavutil/dict.h"
39 #include "libavutil/intfloat.h"
40 #include "libavutil/intreadwrite.h"
41 #include "libavutil/lzo.h"
42 #include "libavutil/mastering_display_metadata.h"
43 #include "libavutil/mathematics.h"
44 #include "libavutil/opt.h"
45 #include "libavutil/time_internal.h"
46 #include "libavutil/spherical.h"
48 #include "libavcodec/bytestream.h"
49 #include "libavcodec/flac.h"
50 #include "libavcodec/mpeg4audio.h"
51 #include "libavcodec/packet_internal.h"
54 #include "avio_internal.h"
59 /* For ff_codec_get_id(). */
70 #include "qtpalette.h"
72 #define EBML_UNKNOWN_LENGTH UINT64_MAX /* EBML unknown length, in uint64_t */
73 #define NEEDS_CHECKING 2 /* Indicates that some error checks
74 * still need to be performed */
75 #define LEVEL_ENDED 3 /* return value of ebml_parse when the
76 * syntax level used for parsing ended. */
77 #define SKIP_THRESHOLD 1024 * 1024 /* In non-seekable mode, if more than SKIP_THRESHOLD
78 * of unkown, potentially damaged data is encountered,
79 * it is considered an error. */
80 #define UNKNOWN_EQUIV 50 * 1024 /* An unknown element is considered equivalent
81 * to this many bytes of unknown data for the
82 * SKIP_THRESHOLD check. */
98 typedef struct CountedElement {
108 typedef const struct EbmlSyntax {
112 size_t list_elem_size;
119 const struct EbmlSyntax *n;
123 typedef struct EbmlList {
125 unsigned int alloc_elem_size;
129 typedef struct EbmlBin {
136 typedef struct Ebml {
141 uint64_t doctype_version;
144 typedef struct MatroskaTrackCompression {
147 } MatroskaTrackCompression;
149 typedef struct MatroskaTrackEncryption {
152 } MatroskaTrackEncryption;
154 typedef struct MatroskaTrackEncoding {
157 MatroskaTrackCompression compression;
158 MatroskaTrackEncryption encryption;
159 } MatroskaTrackEncoding;
161 typedef struct MatroskaMasteringMeta {
170 double max_luminance;
171 CountedElement min_luminance;
172 } MatroskaMasteringMeta;
174 typedef struct MatroskaTrackVideoColor {
175 uint64_t matrix_coefficients;
176 uint64_t bits_per_channel;
177 uint64_t chroma_sub_horz;
178 uint64_t chroma_sub_vert;
179 uint64_t cb_sub_horz;
180 uint64_t cb_sub_vert;
181 uint64_t chroma_siting_horz;
182 uint64_t chroma_siting_vert;
184 uint64_t transfer_characteristics;
188 MatroskaMasteringMeta mastering_meta;
189 } MatroskaTrackVideoColor;
191 typedef struct MatroskaTrackVideoProjection {
197 } MatroskaTrackVideoProjection;
199 typedef struct MatroskaTrackVideo {
201 uint64_t display_width;
202 uint64_t display_height;
203 uint64_t pixel_width;
204 uint64_t pixel_height;
206 uint64_t display_unit;
208 uint64_t field_order;
209 uint64_t stereo_mode;
212 MatroskaTrackVideoProjection projection;
213 } MatroskaTrackVideo;
215 typedef struct MatroskaTrackAudio {
217 double out_samplerate;
221 /* real audio header (extracted from extradata) */
228 uint64_t buf_timecode;
230 } MatroskaTrackAudio;
232 typedef struct MatroskaTrackPlane {
235 } MatroskaTrackPlane;
237 typedef struct MatroskaTrackOperation {
238 EbmlList combine_planes;
239 } MatroskaTrackOperation;
241 typedef struct MatroskaTrack {
250 uint64_t default_duration;
251 uint64_t flag_default;
252 uint64_t flag_forced;
253 uint64_t flag_comment;
254 uint64_t seek_preroll;
255 MatroskaTrackVideo video;
256 MatroskaTrackAudio audio;
257 MatroskaTrackOperation operation;
259 uint64_t codec_delay;
260 uint64_t codec_delay_in_track_tb;
263 int64_t end_timecode;
266 uint64_t max_block_additional_id;
268 uint32_t palette[AVPALETTE_COUNT];
272 typedef struct MatroskaAttachment {
280 } MatroskaAttachment;
282 typedef struct MatroskaChapter {
291 typedef struct MatroskaIndexPos {
296 typedef struct MatroskaIndex {
301 typedef struct MatroskaTag {
309 typedef struct MatroskaTagTarget {
317 typedef struct MatroskaTags {
318 MatroskaTagTarget target;
322 typedef struct MatroskaSeekhead {
327 typedef struct MatroskaLevel {
332 typedef struct MatroskaBlock {
334 CountedElement reference;
337 uint64_t additional_id;
339 int64_t discard_padding;
342 typedef struct MatroskaCluster {
348 typedef struct MatroskaLevel1Element {
352 } MatroskaLevel1Element;
354 typedef struct MatroskaDemuxContext {
355 const AVClass *class;
356 AVFormatContext *ctx;
359 MatroskaLevel levels[EBML_MAX_DEPTH];
371 EbmlList attachments;
377 /* byte position of the segment inside the stream */
378 int64_t segment_start;
380 /* the packet queue */
382 AVPacketList *queue_end;
386 /* What to skip before effectively reading a packet. */
387 int skip_to_keyframe;
388 uint64_t skip_to_timecode;
390 /* File has a CUES element, but we defer parsing until it is needed. */
391 int cues_parsing_deferred;
393 /* Level1 elements and whether they were read yet */
394 MatroskaLevel1Element level1_elems[64];
395 int num_level1_elems;
397 MatroskaCluster current_cluster;
399 /* WebM DASH Manifest live flag */
402 /* Bandwidth value for WebM DASH Manifest */
404 } MatroskaDemuxContext;
406 #define CHILD_OF(parent) { .def = { .n = parent } }
408 // The following forward declarations need their size because
409 // a tentative definition with internal linkage must not be an
410 // incomplete type (6.7.2 in C90, 6.9.2 in C99).
411 // Removing the sizes breaks MSVC.
412 static EbmlSyntax ebml_syntax[3], matroska_segment[9], matroska_track_video_color[15], matroska_track_video[19],
413 matroska_track[28], matroska_track_encoding[6], matroska_track_encodings[2],
414 matroska_track_combine_planes[2], matroska_track_operation[2], matroska_tracks[2],
415 matroska_attachments[2], matroska_chapter_entry[9], matroska_chapter[6], matroska_chapters[2],
416 matroska_index_entry[3], matroska_index[2], matroska_tag[3], matroska_tags[2], matroska_seekhead[2],
417 matroska_blockadditions[2], matroska_blockgroup[8], matroska_cluster_parsing[8];
419 static EbmlSyntax ebml_header[] = {
420 { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, 0, offsetof(Ebml, version), { .u = EBML_VERSION } },
421 { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, 0, offsetof(Ebml, max_size), { .u = 8 } },
422 { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, 0, offsetof(Ebml, id_length), { .u = 4 } },
423 { EBML_ID_DOCTYPE, EBML_STR, 0, 0, offsetof(Ebml, doctype), { .s = "(none)" } },
424 { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, 0, offsetof(Ebml, doctype_version), { .u = 1 } },
425 { EBML_ID_EBMLVERSION, EBML_NONE },
426 { EBML_ID_DOCTYPEVERSION, EBML_NONE },
427 CHILD_OF(ebml_syntax)
430 static EbmlSyntax ebml_syntax[] = {
431 { EBML_ID_HEADER, EBML_NEST, 0, 0, 0, { .n = ebml_header } },
432 { MATROSKA_ID_SEGMENT, EBML_STOP },
436 static EbmlSyntax matroska_info[] = {
437 { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, 0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } },
438 { MATROSKA_ID_DURATION, EBML_FLOAT, 0, 0, offsetof(MatroskaDemuxContext, duration) },
439 { MATROSKA_ID_TITLE, EBML_UTF8, 0, 0, offsetof(MatroskaDemuxContext, title) },
440 { MATROSKA_ID_WRITINGAPP, EBML_NONE },
441 { MATROSKA_ID_MUXINGAPP, EBML_UTF8, 0, 0, offsetof(MatroskaDemuxContext, muxingapp) },
442 { MATROSKA_ID_DATEUTC, EBML_BIN, 0, 0, offsetof(MatroskaDemuxContext, date_utc) },
443 { MATROSKA_ID_SEGMENTUID, EBML_NONE },
444 CHILD_OF(matroska_segment)
447 static EbmlSyntax matroska_mastering_meta[] = {
448 { MATROSKA_ID_VIDEOCOLOR_RX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, r_x) },
449 { MATROSKA_ID_VIDEOCOLOR_RY, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, r_y) },
450 { MATROSKA_ID_VIDEOCOLOR_GX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, g_x) },
451 { MATROSKA_ID_VIDEOCOLOR_GY, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, g_y) },
452 { MATROSKA_ID_VIDEOCOLOR_BX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, b_x) },
453 { MATROSKA_ID_VIDEOCOLOR_BY, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, b_y) },
454 { MATROSKA_ID_VIDEOCOLOR_WHITEX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, white_x) },
455 { MATROSKA_ID_VIDEOCOLOR_WHITEY, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, white_y) },
456 { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN, EBML_FLOAT, 1, 0, offsetof(MatroskaMasteringMeta, min_luminance) },
457 { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, max_luminance) },
458 CHILD_OF(matroska_track_video_color)
461 static EbmlSyntax matroska_track_video_color[] = {
462 { MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, matrix_coefficients), { .u = AVCOL_SPC_UNSPECIFIED } },
463 { MATROSKA_ID_VIDEOCOLORBITSPERCHANNEL, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, bits_per_channel), { .u = 0 } },
464 { MATROSKA_ID_VIDEOCOLORCHROMASUBHORZ, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_horz) },
465 { MATROSKA_ID_VIDEOCOLORCHROMASUBVERT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_vert) },
466 { MATROSKA_ID_VIDEOCOLORCBSUBHORZ, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, cb_sub_horz) },
467 { MATROSKA_ID_VIDEOCOLORCBSUBVERT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, cb_sub_vert) },
468 { MATROSKA_ID_VIDEOCOLORCHROMASITINGHORZ, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, chroma_siting_horz), { .u = MATROSKA_COLOUR_CHROMASITINGHORZ_UNDETERMINED } },
469 { MATROSKA_ID_VIDEOCOLORCHROMASITINGVERT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, chroma_siting_vert), { .u = MATROSKA_COLOUR_CHROMASITINGVERT_UNDETERMINED } },
470 { MATROSKA_ID_VIDEOCOLORRANGE, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, range), { .u = AVCOL_RANGE_UNSPECIFIED } },
471 { MATROSKA_ID_VIDEOCOLORTRANSFERCHARACTERISTICS, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, transfer_characteristics), { .u = AVCOL_TRC_UNSPECIFIED } },
472 { MATROSKA_ID_VIDEOCOLORPRIMARIES, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, primaries), { .u = AVCOL_PRI_UNSPECIFIED } },
473 { MATROSKA_ID_VIDEOCOLORMAXCLL, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, max_cll) },
474 { MATROSKA_ID_VIDEOCOLORMAXFALL, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, max_fall) },
475 { MATROSKA_ID_VIDEOCOLORMASTERINGMETA, EBML_NEST, 0, 0, offsetof(MatroskaTrackVideoColor, mastering_meta), { .n = matroska_mastering_meta } },
476 CHILD_OF(matroska_track_video)
479 static EbmlSyntax matroska_track_video_projection[] = {
480 { MATROSKA_ID_VIDEOPROJECTIONTYPE, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoProjection, type), { .u = MATROSKA_VIDEO_PROJECTION_TYPE_RECTANGULAR } },
481 { MATROSKA_ID_VIDEOPROJECTIONPRIVATE, EBML_BIN, 0, 0, offsetof(MatroskaTrackVideoProjection, private) },
482 { MATROSKA_ID_VIDEOPROJECTIONPOSEYAW, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackVideoProjection, yaw), { .f = 0.0 } },
483 { MATROSKA_ID_VIDEOPROJECTIONPOSEPITCH, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackVideoProjection, pitch), { .f = 0.0 } },
484 { MATROSKA_ID_VIDEOPROJECTIONPOSEROLL, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackVideoProjection, roll), { .f = 0.0 } },
485 CHILD_OF(matroska_track_video)
488 static EbmlSyntax matroska_track_video[] = {
489 { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackVideo, frame_rate) },
490 { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, display_width), { .u=-1 } },
491 { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, display_height), { .u=-1 } },
492 { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, pixel_width) },
493 { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, pixel_height) },
494 { MATROSKA_ID_VIDEOCOLORSPACE, EBML_BIN, 0, 0, offsetof(MatroskaTrackVideo, color_space) },
495 { MATROSKA_ID_VIDEOALPHAMODE, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, alpha_mode), { .u = 0 } },
496 { MATROSKA_ID_VIDEOCOLOR, EBML_NEST, 0, sizeof(MatroskaTrackVideoColor), offsetof(MatroskaTrackVideo, color), { .n = matroska_track_video_color } },
497 { MATROSKA_ID_VIDEOPROJECTION, EBML_NEST, 0, 0, offsetof(MatroskaTrackVideo, projection), { .n = matroska_track_video_projection } },
498 { MATROSKA_ID_VIDEOPIXELCROPB, EBML_NONE },
499 { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
500 { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
501 { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
502 { MATROSKA_ID_VIDEODISPLAYUNIT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, display_unit), { .u= MATROSKA_VIDEO_DISPLAYUNIT_PIXELS } },
503 { MATROSKA_ID_VIDEOFLAGINTERLACED, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, interlaced), { .u = MATROSKA_VIDEO_INTERLACE_FLAG_UNDETERMINED } },
504 { MATROSKA_ID_VIDEOFIELDORDER, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, field_order), { .u = MATROSKA_VIDEO_FIELDORDER_UNDETERMINED } },
505 { MATROSKA_ID_VIDEOSTEREOMODE, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, stereo_mode), { .u = MATROSKA_VIDEO_STEREOMODE_TYPE_NB } },
506 { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
507 CHILD_OF(matroska_track)
510 static EbmlSyntax matroska_track_audio[] = {
511 { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } },
512 { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackAudio, out_samplerate) },
513 { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, 0, offsetof(MatroskaTrackAudio, bitdepth) },
514 { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, 0, offsetof(MatroskaTrackAudio, channels), { .u = 1 } },
515 CHILD_OF(matroska_track)
518 static EbmlSyntax matroska_track_encoding_compression[] = {
519 { MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, 0, offsetof(MatroskaTrackCompression, algo), { .u = MATROSKA_TRACK_ENCODING_COMP_ZLIB } },
520 { MATROSKA_ID_ENCODINGCOMPSETTINGS, EBML_BIN, 0, 0, offsetof(MatroskaTrackCompression, settings) },
521 CHILD_OF(matroska_track_encoding)
524 static EbmlSyntax matroska_track_encoding_encryption[] = {
525 { MATROSKA_ID_ENCODINGENCALGO, EBML_UINT, 0, 0, offsetof(MatroskaTrackEncryption,algo), {.u = 0} },
526 { MATROSKA_ID_ENCODINGENCKEYID, EBML_BIN, 0, 0, offsetof(MatroskaTrackEncryption,key_id) },
527 { MATROSKA_ID_ENCODINGENCAESSETTINGS, EBML_NONE },
528 { MATROSKA_ID_ENCODINGSIGALGO, EBML_NONE },
529 { MATROSKA_ID_ENCODINGSIGHASHALGO, EBML_NONE },
530 { MATROSKA_ID_ENCODINGSIGKEYID, EBML_NONE },
531 { MATROSKA_ID_ENCODINGSIGNATURE, EBML_NONE },
532 CHILD_OF(matroska_track_encoding)
534 static EbmlSyntax matroska_track_encoding[] = {
535 { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, 0, offsetof(MatroskaTrackEncoding, scope), { .u = 1 } },
536 { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, 0, offsetof(MatroskaTrackEncoding, type), { .u = 0 } },
537 { MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } },
538 { MATROSKA_ID_ENCODINGENCRYPTION, EBML_NEST, 0, 0, offsetof(MatroskaTrackEncoding, encryption), { .n = matroska_track_encoding_encryption } },
539 { MATROSKA_ID_ENCODINGORDER, EBML_NONE },
540 CHILD_OF(matroska_track_encodings)
543 static EbmlSyntax matroska_track_encodings[] = {
544 { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, 0, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } },
545 CHILD_OF(matroska_track)
548 static EbmlSyntax matroska_track_plane[] = {
549 { MATROSKA_ID_TRACKPLANEUID, EBML_UINT, 0, 0, offsetof(MatroskaTrackPlane,uid) },
550 { MATROSKA_ID_TRACKPLANETYPE, EBML_UINT, 0, 0, offsetof(MatroskaTrackPlane,type) },
551 CHILD_OF(matroska_track_combine_planes)
554 static EbmlSyntax matroska_track_combine_planes[] = {
555 { MATROSKA_ID_TRACKPLANE, EBML_NEST, 0, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n = matroska_track_plane} },
556 CHILD_OF(matroska_track_operation)
559 static EbmlSyntax matroska_track_operation[] = {
560 { MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, 0, {.n = matroska_track_combine_planes} },
561 CHILD_OF(matroska_track)
564 static EbmlSyntax matroska_track[] = {
565 { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, 0, offsetof(MatroskaTrack, num) },
566 { MATROSKA_ID_TRACKNAME, EBML_UTF8, 0, 0, offsetof(MatroskaTrack, name) },
567 { MATROSKA_ID_TRACKUID, EBML_UINT, 0, 0, offsetof(MatroskaTrack, uid) },
568 { MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, 0, offsetof(MatroskaTrack, type) },
569 { MATROSKA_ID_CODECID, EBML_STR, 0, 0, offsetof(MatroskaTrack, codec_id) },
570 { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, 0, offsetof(MatroskaTrack, codec_priv) },
571 { MATROSKA_ID_CODECDELAY, EBML_UINT, 0, 0, offsetof(MatroskaTrack, codec_delay), { .u = 0 } },
572 { MATROSKA_ID_TRACKLANGUAGE, EBML_STR, 0, 0, offsetof(MatroskaTrack, language), { .s = "eng" } },
573 { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, 0, offsetof(MatroskaTrack, default_duration) },
574 { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } },
575 { MATROSKA_ID_TRACKFLAGCOMMENTARY, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_comment), { .u = 0 } },
576 { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_default), { .u = 1 } },
577 { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } },
578 { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } },
579 { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } },
580 { MATROSKA_ID_TRACKOPERATION, EBML_NEST, 0, 0, offsetof(MatroskaTrack, operation), { .n = matroska_track_operation } },
581 { MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST, 0, 0, 0, { .n = matroska_track_encodings } },
582 { MATROSKA_ID_TRACKMAXBLKADDID, EBML_UINT, 0, 0, offsetof(MatroskaTrack, max_block_additional_id), { .u = 0 } },
583 { MATROSKA_ID_SEEKPREROLL, EBML_UINT, 0, 0, offsetof(MatroskaTrack, seek_preroll), { .u = 0 } },
584 { MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE },
585 { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
586 { MATROSKA_ID_CODECNAME, EBML_NONE },
587 { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
588 { MATROSKA_ID_CODECINFOURL, EBML_NONE },
589 { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
590 { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
591 { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
592 CHILD_OF(matroska_tracks)
595 static EbmlSyntax matroska_tracks[] = {
596 { MATROSKA_ID_TRACKENTRY, EBML_NEST, 0, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } },
597 CHILD_OF(matroska_segment)
600 static EbmlSyntax matroska_attachment[] = {
601 { MATROSKA_ID_FILEUID, EBML_UINT, 0, 0, offsetof(MatroskaAttachment, uid) },
602 { MATROSKA_ID_FILENAME, EBML_UTF8, 0, 0, offsetof(MatroskaAttachment, filename) },
603 { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, 0, offsetof(MatroskaAttachment, mime) },
604 { MATROSKA_ID_FILEDATA, EBML_BIN, 0, 0, offsetof(MatroskaAttachment, bin) },
605 { MATROSKA_ID_FILEDESC, EBML_UTF8, 0, 0, offsetof(MatroskaAttachment, description) },
606 CHILD_OF(matroska_attachments)
609 static EbmlSyntax matroska_attachments[] = {
610 { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, 0, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } },
611 CHILD_OF(matroska_segment)
614 static EbmlSyntax matroska_chapter_display[] = {
615 { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, 0, offsetof(MatroskaChapter, title) },
616 { MATROSKA_ID_CHAPLANG, EBML_NONE },
617 { MATROSKA_ID_CHAPCOUNTRY, EBML_NONE },
618 CHILD_OF(matroska_chapter_entry)
621 static EbmlSyntax matroska_chapter_entry[] = {
622 { MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, 0, offsetof(MatroskaChapter, start), { .u = AV_NOPTS_VALUE } },
623 { MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, 0, offsetof(MatroskaChapter, end), { .u = AV_NOPTS_VALUE } },
624 { MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, 0, offsetof(MatroskaChapter, uid) },
625 { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, 0, { .n = matroska_chapter_display } },
626 { MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
627 { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
628 { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
629 { MATROSKA_ID_CHAPTERATOM, EBML_NONE },
630 CHILD_OF(matroska_chapter)
633 static EbmlSyntax matroska_chapter[] = {
634 { MATROSKA_ID_CHAPTERATOM, EBML_NEST, 0, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } },
635 { MATROSKA_ID_EDITIONUID, EBML_NONE },
636 { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
637 { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
638 { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
639 CHILD_OF(matroska_chapters)
642 static EbmlSyntax matroska_chapters[] = {
643 { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, 0, { .n = matroska_chapter } },
644 CHILD_OF(matroska_segment)
647 static EbmlSyntax matroska_index_pos[] = {
648 { MATROSKA_ID_CUETRACK, EBML_UINT, 0, 0, offsetof(MatroskaIndexPos, track) },
649 { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, 0, offsetof(MatroskaIndexPos, pos) },
650 { MATROSKA_ID_CUERELATIVEPOSITION,EBML_NONE },
651 { MATROSKA_ID_CUEDURATION, EBML_NONE },
652 { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
653 CHILD_OF(matroska_index_entry)
656 static EbmlSyntax matroska_index_entry[] = {
657 { MATROSKA_ID_CUETIME, EBML_UINT, 0, 0, offsetof(MatroskaIndex, time) },
658 { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, 0, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } },
659 CHILD_OF(matroska_index)
662 static EbmlSyntax matroska_index[] = {
663 { MATROSKA_ID_POINTENTRY, EBML_NEST, 0, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } },
664 CHILD_OF(matroska_segment)
667 static EbmlSyntax matroska_simpletag[] = {
668 { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, 0, offsetof(MatroskaTag, name) },
669 { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, 0, offsetof(MatroskaTag, string) },
670 { MATROSKA_ID_TAGLANG, EBML_STR, 0, 0, offsetof(MatroskaTag, lang), { .s = "und" } },
671 { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, 0, offsetof(MatroskaTag, def) },
672 { MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0, 0, offsetof(MatroskaTag, def) },
673 { MATROSKA_ID_SIMPLETAG, EBML_NEST, 0, sizeof(MatroskaTag), offsetof(MatroskaTag, sub), { .n = matroska_simpletag } },
674 CHILD_OF(matroska_tag)
677 static EbmlSyntax matroska_tagtargets[] = {
678 { MATROSKA_ID_TAGTARGETS_TYPE, EBML_STR, 0, 0, offsetof(MatroskaTagTarget, type) },
679 { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } },
680 { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, 0, offsetof(MatroskaTagTarget, trackuid), { .u = 0 } },
681 { MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, 0, offsetof(MatroskaTagTarget, chapteruid), { .u = 0 } },
682 { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, 0, offsetof(MatroskaTagTarget, attachuid), { .u = 0 } },
683 CHILD_OF(matroska_tag)
686 static EbmlSyntax matroska_tag[] = {
687 { MATROSKA_ID_SIMPLETAG, EBML_NEST, 0, sizeof(MatroskaTag), offsetof(MatroskaTags, tag), { .n = matroska_simpletag } },
688 { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, 0, offsetof(MatroskaTags, target), { .n = matroska_tagtargets } },
689 CHILD_OF(matroska_tags)
692 static EbmlSyntax matroska_tags[] = {
693 { MATROSKA_ID_TAG, EBML_NEST, 0, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } },
694 CHILD_OF(matroska_segment)
697 static EbmlSyntax matroska_seekhead_entry[] = {
698 { MATROSKA_ID_SEEKID, EBML_UINT, 0, 0, offsetof(MatroskaSeekhead, id) },
699 { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } },
700 CHILD_OF(matroska_seekhead)
703 static EbmlSyntax matroska_seekhead[] = {
704 { MATROSKA_ID_SEEKENTRY, EBML_NEST, 0, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } },
705 CHILD_OF(matroska_segment)
708 static EbmlSyntax matroska_segment[] = {
709 { MATROSKA_ID_CLUSTER, EBML_STOP },
710 { MATROSKA_ID_INFO, EBML_LEVEL1, 0, 0, 0, { .n = matroska_info } },
711 { MATROSKA_ID_TRACKS, EBML_LEVEL1, 0, 0, 0, { .n = matroska_tracks } },
712 { MATROSKA_ID_ATTACHMENTS, EBML_LEVEL1, 0, 0, 0, { .n = matroska_attachments } },
713 { MATROSKA_ID_CHAPTERS, EBML_LEVEL1, 0, 0, 0, { .n = matroska_chapters } },
714 { MATROSKA_ID_CUES, EBML_LEVEL1, 0, 0, 0, { .n = matroska_index } },
715 { MATROSKA_ID_TAGS, EBML_LEVEL1, 0, 0, 0, { .n = matroska_tags } },
716 { MATROSKA_ID_SEEKHEAD, EBML_LEVEL1, 0, 0, 0, { .n = matroska_seekhead } },
717 { 0 } /* We don't want to go back to level 0, so don't add the parent. */
720 static EbmlSyntax matroska_segments[] = {
721 { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, 0, { .n = matroska_segment } },
725 static EbmlSyntax matroska_blockmore[] = {
726 { MATROSKA_ID_BLOCKADDID, EBML_UINT, 0, 0, offsetof(MatroskaBlock,additional_id), { .u = 1 } },
727 { MATROSKA_ID_BLOCKADDITIONAL, EBML_BIN, 0, 0, offsetof(MatroskaBlock,additional) },
728 CHILD_OF(matroska_blockadditions)
731 static EbmlSyntax matroska_blockadditions[] = {
732 { MATROSKA_ID_BLOCKMORE, EBML_NEST, 0, 0, 0, {.n = matroska_blockmore} },
733 CHILD_OF(matroska_blockgroup)
736 static EbmlSyntax matroska_blockgroup[] = {
737 { MATROSKA_ID_BLOCK, EBML_BIN, 0, 0, offsetof(MatroskaBlock, bin) },
738 { MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, 0, { .n = matroska_blockadditions} },
739 { MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, 0, offsetof(MatroskaBlock, duration) },
740 { MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, 0, offsetof(MatroskaBlock, discard_padding) },
741 { MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 1, 0, offsetof(MatroskaBlock, reference) },
742 { MATROSKA_ID_CODECSTATE, EBML_NONE },
743 { 1, EBML_UINT, 0, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } },
744 CHILD_OF(matroska_cluster_parsing)
747 // The following array contains SimpleBlock and BlockGroup twice
748 // in order to reuse the other values for matroska_cluster_enter.
749 static EbmlSyntax matroska_cluster_parsing[] = {
750 { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, 0, offsetof(MatroskaBlock, bin) },
751 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, 0, 0, 0, { .n = matroska_blockgroup } },
752 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, 0, offsetof(MatroskaCluster, timecode) },
753 { MATROSKA_ID_SIMPLEBLOCK, EBML_STOP },
754 { MATROSKA_ID_BLOCKGROUP, EBML_STOP },
755 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
756 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
757 CHILD_OF(matroska_segment)
760 static EbmlSyntax matroska_cluster_enter[] = {
761 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, 0, { .n = &matroska_cluster_parsing[2] } },
766 static const CodecMime mkv_image_mime_tags[] = {
767 {"image/gif" , AV_CODEC_ID_GIF},
768 {"image/jpeg" , AV_CODEC_ID_MJPEG},
769 {"image/png" , AV_CODEC_ID_PNG},
770 {"image/tiff" , AV_CODEC_ID_TIFF},
772 {"" , AV_CODEC_ID_NONE}
775 static const CodecMime mkv_mime_tags[] = {
776 {"text/plain" , AV_CODEC_ID_TEXT},
777 {"application/x-truetype-font", AV_CODEC_ID_TTF},
778 {"application/x-font" , AV_CODEC_ID_TTF},
779 {"application/vnd.ms-opentype", AV_CODEC_ID_OTF},
780 {"binary" , AV_CODEC_ID_BIN_DATA},
782 {"" , AV_CODEC_ID_NONE}
785 static const char *const matroska_doctypes[] = { "matroska", "webm" };
787 static int matroska_read_close(AVFormatContext *s);
790 * This function prepares the status for parsing of level 1 elements.
792 static int matroska_reset_status(MatroskaDemuxContext *matroska,
793 uint32_t id, int64_t position)
796 int64_t err = avio_seek(matroska->ctx->pb, position, SEEK_SET);
801 matroska->current_id = id;
802 matroska->num_levels = 1;
803 matroska->unknown_count = 0;
804 matroska->resync_pos = avio_tell(matroska->ctx->pb);
806 matroska->resync_pos -= (av_log2(id) + 7) / 8;
811 static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos)
813 AVIOContext *pb = matroska->ctx->pb;
816 /* Try to seek to the last position to resync from. If this doesn't work,
817 * we resync from the earliest position available: The start of the buffer. */
818 if (last_pos < avio_tell(pb) && avio_seek(pb, last_pos + 1, SEEK_SET) < 0) {
819 av_log(matroska->ctx, AV_LOG_WARNING,
820 "Seek to desired resync point failed. Seeking to "
821 "earliest point available instead.\n");
822 avio_seek(pb, FFMAX(avio_tell(pb) + (pb->buffer - pb->buf_ptr),
823 last_pos + 1), SEEK_SET);
828 // try to find a toplevel element
829 while (!avio_feof(pb)) {
830 if (id == MATROSKA_ID_INFO || id == MATROSKA_ID_TRACKS ||
831 id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS ||
832 id == MATROSKA_ID_SEEKHEAD || id == MATROSKA_ID_ATTACHMENTS ||
833 id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) {
834 /* Prepare the context for parsing of a level 1 element. */
835 matroska_reset_status(matroska, id, -1);
836 /* Given that we are here means that an error has occurred,
837 * so treat the segment as unknown length in order not to
838 * discard valid data that happens to be beyond the designated
839 * end of the segment. */
840 matroska->levels[0].length = EBML_UNKNOWN_LENGTH;
843 id = (id << 8) | avio_r8(pb);
847 return pb->error ? pb->error : AVERROR_EOF;
851 * Read: an "EBML number", which is defined as a variable-length
852 * array of bytes. The first byte indicates the length by giving a
853 * number of 0-bits followed by a one. The position of the first
854 * "one" bit inside the first byte indicates the length of this
856 * Returns: number of bytes read, < 0 on error
858 static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb,
859 int max_size, uint64_t *number, int eof_forbidden)
865 /* The first byte tells us the length in bytes - except when it is zero. */
870 /* get the length of the EBML number */
871 read = 8 - ff_log2_tab[total];
873 if (!total || read > max_size) {
874 pos = avio_tell(pb) - 1;
876 av_log(matroska->ctx, AV_LOG_ERROR,
877 "0x00 at pos %"PRId64" (0x%"PRIx64") invalid as first byte "
878 "of an EBML number\n", pos, pos);
880 av_log(matroska->ctx, AV_LOG_ERROR,
881 "Length %d indicated by an EBML number's first byte 0x%02x "
882 "at pos %"PRId64" (0x%"PRIx64") exceeds max length %d.\n",
883 read, (uint8_t) total, pos, pos, max_size);
885 return AVERROR_INVALIDDATA;
888 /* read out length */
889 total ^= 1 << ff_log2_tab[total];
891 total = (total << 8) | avio_r8(pb);
893 if (pb->eof_reached) {
905 av_log(matroska->ctx, AV_LOG_ERROR,
906 "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
911 av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
912 "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
919 * Read a EBML length value.
920 * This needs special handling for the "unknown length" case which has multiple
923 static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
926 int res = ebml_read_num(matroska, pb, 8, number, 1);
927 if (res > 0 && *number + 1 == 1ULL << (7 * res))
928 *number = EBML_UNKNOWN_LENGTH;
933 * Read the next element as an unsigned int.
934 * Returns NEEDS_CHECKING unless size == 0.
936 static int ebml_read_uint(AVIOContext *pb, int size,
937 uint64_t default_value, uint64_t *num)
942 *num = default_value;
945 /* big-endian ordering; build up number */
948 *num = (*num << 8) | avio_r8(pb);
950 return NEEDS_CHECKING;
954 * Read the next element as a signed int.
955 * Returns NEEDS_CHECKING unless size == 0.
957 static int ebml_read_sint(AVIOContext *pb, int size,
958 int64_t default_value, int64_t *num)
963 *num = default_value;
966 *num = sign_extend(avio_r8(pb), 8);
968 /* big-endian ordering; build up number */
970 *num = ((uint64_t)*num << 8) | avio_r8(pb);
973 return NEEDS_CHECKING;
977 * Read the next element as a float.
978 * Returns 0 if size == 0, NEEDS_CHECKING or < 0 on obvious failure.
980 static int ebml_read_float(AVIOContext *pb, int size,
981 double default_value, double *num)
984 *num = default_value;
986 } else if (size == 4) {
987 *num = av_int2float(avio_rb32(pb));
988 } else if (size == 8) {
989 *num = av_int2double(avio_rb64(pb));
991 return AVERROR_INVALIDDATA;
993 return NEEDS_CHECKING;
997 * Read the next element as an ASCII string.
998 * 0 is success, < 0 or NEEDS_CHECKING is failure.
1000 static int ebml_read_ascii(AVIOContext *pb, int size,
1001 const char *default_value, char **str)
1006 if (size == 0 && default_value) {
1007 res = av_strdup(default_value);
1009 return AVERROR(ENOMEM);
1011 /* EBML strings are usually not 0-terminated, so we allocate one
1012 * byte more, read the string and NUL-terminate it ourselves. */
1013 if (!(res = av_malloc(size + 1)))
1014 return AVERROR(ENOMEM);
1015 if ((ret = avio_read(pb, (uint8_t *) res, size)) != size) {
1017 return ret < 0 ? ret : NEEDS_CHECKING;
1028 * Read the next element as binary data.
1029 * 0 is success, < 0 or NEEDS_CHECKING is failure.
1031 static int ebml_read_binary(AVIOContext *pb, int length,
1032 int64_t pos, EbmlBin *bin)
1036 ret = av_buffer_realloc(&bin->buf, length + AV_INPUT_BUFFER_PADDING_SIZE);
1039 memset(bin->buf->data + length, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1041 bin->data = bin->buf->data;
1044 if ((ret = avio_read(pb, bin->data, length)) != length) {
1045 av_buffer_unref(&bin->buf);
1048 return ret < 0 ? ret : NEEDS_CHECKING;
1055 * Read the next element, but only the header. The contents
1056 * are supposed to be sub-elements which can be read separately.
1057 * 0 is success, < 0 is failure.
1059 static int ebml_read_master(MatroskaDemuxContext *matroska,
1060 uint64_t length, int64_t pos)
1062 MatroskaLevel *level;
1064 if (matroska->num_levels >= EBML_MAX_DEPTH) {
1065 av_log(matroska->ctx, AV_LOG_ERROR,
1066 "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
1067 return AVERROR(ENOSYS);
1070 level = &matroska->levels[matroska->num_levels++];
1072 level->length = length;
1078 * Read a signed "EBML number"
1079 * Return: number of bytes processed, < 0 on error
1081 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
1082 AVIOContext *pb, int64_t *num)
1087 /* read as unsigned number first */
1088 if ((res = ebml_read_num(matroska, pb, 8, &unum, 1)) < 0)
1091 /* make signed (weird way) */
1092 *num = unum - ((1LL << (7 * res - 1)) - 1);
1097 static int ebml_parse(MatroskaDemuxContext *matroska,
1098 EbmlSyntax *syntax, void *data);
1100 static EbmlSyntax *ebml_parse_id(EbmlSyntax *syntax, uint32_t id)
1104 // Whoever touches this should be aware of the duplication
1105 // existing in matroska_cluster_parsing.
1106 for (i = 0; syntax[i].id; i++)
1107 if (id == syntax[i].id)
1113 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
1119 for (int i = 0; syntax[i].id; i++) {
1120 void *dst = (char *)data + syntax[i].data_offset;
1121 switch (syntax[i].type) {
1123 *(uint64_t *)dst = syntax[i].def.u;
1126 *(int64_t *) dst = syntax[i].def.i;
1129 *(double *) dst = syntax[i].def.f;
1133 // the default may be NULL
1134 if (syntax[i].def.s) {
1135 *(char**)dst = av_strdup(syntax[i].def.s);
1137 return AVERROR(ENOMEM);
1143 if (!matroska->levels[matroska->num_levels - 1].length) {
1144 matroska->num_levels--;
1150 res = ebml_parse(matroska, syntax, data);
1153 return res == LEVEL_ENDED ? 0 : res;
1156 static int is_ebml_id_valid(uint32_t id)
1158 // Due to endian nonsense in Matroska, the highest byte with any bits set
1159 // will contain the leading length bit. This bit in turn identifies the
1160 // total byte length of the element by its position within the byte.
1161 unsigned int bits = av_log2(id);
1162 return id && (bits + 7) / 8 == (8 - bits % 8);
1166 * Allocate and return the entry for the level1 element with the given ID. If
1167 * an entry already exists, return the existing entry.
1169 static MatroskaLevel1Element *matroska_find_level1_elem(MatroskaDemuxContext *matroska,
1170 uint32_t id, int64_t pos)
1173 MatroskaLevel1Element *elem;
1175 if (!is_ebml_id_valid(id))
1178 // Some files link to all clusters; useless.
1179 if (id == MATROSKA_ID_CLUSTER)
1182 // There can be multiple SeekHeads and Tags.
1183 for (i = 0; i < matroska->num_level1_elems; i++) {
1184 if (matroska->level1_elems[i].id == id) {
1185 if (matroska->level1_elems[i].pos == pos ||
1186 id != MATROSKA_ID_SEEKHEAD && id != MATROSKA_ID_TAGS)
1187 return &matroska->level1_elems[i];
1191 // Only a completely broken file would have more elements.
1192 if (matroska->num_level1_elems >= FF_ARRAY_ELEMS(matroska->level1_elems)) {
1193 av_log(matroska->ctx, AV_LOG_ERROR, "Too many level1 elements.\n");
1197 elem = &matroska->level1_elems[matroska->num_level1_elems++];
1198 *elem = (MatroskaLevel1Element){.id = id};
1203 static int ebml_parse(MatroskaDemuxContext *matroska,
1204 EbmlSyntax *syntax, void *data)
1206 static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
1207 // Forbid unknown-length EBML_NONE elements.
1208 [EBML_NONE] = EBML_UNKNOWN_LENGTH - 1,
1212 // max. 16 MB for strings
1213 [EBML_STR] = 0x1000000,
1214 [EBML_UTF8] = 0x1000000,
1215 // max. 256 MB for binary data
1216 [EBML_BIN] = 0x10000000,
1217 // no limits for anything else
1219 AVIOContext *pb = matroska->ctx->pb;
1222 int64_t pos = avio_tell(pb), pos_alt;
1223 int res, update_pos = 1, level_check;
1224 MatroskaLevel1Element *level1_elem;
1225 MatroskaLevel *level = matroska->num_levels ? &matroska->levels[matroska->num_levels - 1] : NULL;
1227 if (!matroska->current_id) {
1229 res = ebml_read_num(matroska, pb, 4, &id, 0);
1231 if (pb->eof_reached && res == AVERROR_EOF) {
1232 if (matroska->is_live)
1233 // in live mode, finish parsing if EOF is reached.
1235 if (level && pos == avio_tell(pb)) {
1236 if (level->length == EBML_UNKNOWN_LENGTH) {
1237 // Unknown-length levels automatically end at EOF.
1238 matroska->num_levels--;
1241 av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
1242 "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
1248 matroska->current_id = id | 1 << 7 * res;
1249 pos_alt = pos + res;
1252 pos -= (av_log2(matroska->current_id) + 7) / 8;
1255 id = matroska->current_id;
1257 syntax = ebml_parse_id(syntax, id);
1258 if (!syntax->id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
1259 if (level && level->length == EBML_UNKNOWN_LENGTH) {
1260 // Unknown-length levels end when an element from an upper level
1261 // in the hierarchy is encountered.
1262 while (syntax->def.n) {
1263 syntax = ebml_parse_id(syntax->def.n, id);
1265 matroska->num_levels--;
1271 av_log(matroska->ctx, AV_LOG_DEBUG, "Unknown entry 0x%"PRIX32" at pos. "
1272 "%"PRId64"\n", id, pos);
1273 update_pos = 0; /* Don't update resync_pos as an error might have happened. */
1277 data = (char *) data + syntax->data_offset;
1278 if (syntax->list_elem_size) {
1279 EbmlList *list = data;
1282 if ((unsigned)list->nb_elem + 1 >= UINT_MAX / syntax->list_elem_size)
1283 return AVERROR(ENOMEM);
1284 newelem = av_fast_realloc(list->elem,
1285 &list->alloc_elem_size,
1286 (list->nb_elem + 1) * syntax->list_elem_size);
1288 return AVERROR(ENOMEM);
1289 list->elem = newelem;
1290 data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
1291 memset(data, 0, syntax->list_elem_size);
1296 if (syntax->type != EBML_STOP) {
1297 matroska->current_id = 0;
1298 if ((res = ebml_read_length(matroska, pb, &length)) < 0)
1303 if (matroska->num_levels > 0) {
1304 if (length != EBML_UNKNOWN_LENGTH &&
1305 level->length != EBML_UNKNOWN_LENGTH) {
1306 uint64_t elem_end = pos_alt + length,
1307 level_end = level->start + level->length;
1309 if (elem_end < level_end) {
1311 } else if (elem_end == level_end) {
1312 level_check = LEVEL_ENDED;
1314 av_log(matroska->ctx, AV_LOG_ERROR,
1315 "Element at 0x%"PRIx64" ending at 0x%"PRIx64" exceeds "
1316 "containing master element ending at 0x%"PRIx64"\n",
1317 pos, elem_end, level_end);
1318 return AVERROR_INVALIDDATA;
1320 } else if (length != EBML_UNKNOWN_LENGTH) {
1322 } else if (level->length != EBML_UNKNOWN_LENGTH) {
1323 av_log(matroska->ctx, AV_LOG_ERROR, "Unknown-sized element "
1324 "at 0x%"PRIx64" inside parent with finite size\n", pos);
1325 return AVERROR_INVALIDDATA;
1328 if (id != MATROSKA_ID_CLUSTER && (syntax->type == EBML_LEVEL1
1329 || syntax->type == EBML_NEST)) {
1330 // According to the current specifications only clusters and
1331 // segments are allowed to be unknown-length. We also accept
1332 // other unknown-length master elements.
1333 av_log(matroska->ctx, AV_LOG_WARNING,
1334 "Found unknown-length element 0x%"PRIX32" other than "
1335 "a cluster at 0x%"PRIx64". Spec-incompliant, but "
1336 "parsing will nevertheless be attempted.\n", id, pos);
1343 if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
1344 if (length != EBML_UNKNOWN_LENGTH) {
1345 av_log(matroska->ctx, AV_LOG_ERROR,
1346 "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for element "
1347 "with ID 0x%"PRIX32" at 0x%"PRIx64"\n",
1348 length, max_lengths[syntax->type], id, pos);
1349 } else if (syntax->type != EBML_NONE) {
1350 av_log(matroska->ctx, AV_LOG_ERROR,
1351 "Element with ID 0x%"PRIX32" at pos. 0x%"PRIx64" has "
1352 "unknown length, yet the length of an element of its "
1353 "type must be known.\n", id, pos);
1355 av_log(matroska->ctx, AV_LOG_ERROR,
1356 "Found unknown-length element with ID 0x%"PRIX32" at "
1357 "pos. 0x%"PRIx64" for which no syntax for parsing is "
1358 "available.\n", id, pos);
1360 return AVERROR_INVALIDDATA;
1363 if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
1364 // Loosing sync will likely manifest itself as encountering unknown
1365 // elements which are not reliably distinguishable from elements
1366 // belonging to future extensions of the format.
1367 // We use a heuristic to detect such situations: If the current
1368 // element is not expected at the current syntax level and there
1369 // were only a few unknown elements in a row, then the element is
1370 // skipped or considered defective based upon the length of the
1371 // current element (i.e. how much would be skipped); if there were
1372 // more than a few skipped elements in a row and skipping the current
1373 // element would lead us more than SKIP_THRESHOLD away from the last
1374 // known good position, then it is inferred that an error occurred.
1375 // The dependency on the number of unknown elements in a row exists
1376 // because the distance to the last known good position is
1377 // automatically big if the last parsed element was big.
1378 // In both cases, each unknown element is considered equivalent to
1379 // UNKNOWN_EQUIV of skipped bytes for the check.
1380 // The whole check is only done for non-seekable output, because
1381 // in this situation skipped data can't simply be rechecked later.
1382 // This is especially important when using unkown length elements
1383 // as the check for whether a child exceeds its containing master
1384 // element is not effective in this situation.
1386 matroska->unknown_count = 0;
1388 int64_t dist = length + UNKNOWN_EQUIV * matroska->unknown_count++;
1390 if (matroska->unknown_count > 3)
1391 dist += pos_alt - matroska->resync_pos;
1393 if (dist > SKIP_THRESHOLD) {
1394 av_log(matroska->ctx, AV_LOG_ERROR,
1395 "Unknown element %"PRIX32" at pos. 0x%"PRIx64" with "
1396 "length 0x%"PRIx64" considered as invalid data. Last "
1397 "known good position 0x%"PRIx64", %d unknown elements"
1398 " in a row\n", id, pos, length, matroska->resync_pos,
1399 matroska->unknown_count);
1400 return AVERROR_INVALIDDATA;
1405 if (update_pos > 0) {
1406 // We have found an element that is allowed at this place
1407 // in the hierarchy and it passed all checks, so treat the beginning
1408 // of the element as the "last known good" position.
1409 matroska->resync_pos = pos;
1412 if (!data && length != EBML_UNKNOWN_LENGTH)
1416 switch (syntax->type) {
1418 res = ebml_read_uint(pb, length, syntax->def.u, data);
1421 res = ebml_read_sint(pb, length, syntax->def.i, data);
1424 res = ebml_read_float(pb, length, syntax->def.f, data);
1428 res = ebml_read_ascii(pb, length, syntax->def.s, data);
1431 res = ebml_read_binary(pb, length, pos_alt, data);
1435 if ((res = ebml_read_master(matroska, length, pos_alt)) < 0)
1437 if (id == MATROSKA_ID_SEGMENT)
1438 matroska->segment_start = pos_alt;
1439 if (id == MATROSKA_ID_CUES)
1440 matroska->cues_parsing_deferred = 0;
1441 if (syntax->type == EBML_LEVEL1 &&
1442 (level1_elem = matroska_find_level1_elem(matroska, syntax->id, pos))) {
1443 if (!level1_elem->pos) {
1444 // Zero is not a valid position for a level 1 element.
1445 level1_elem->pos = pos;
1446 } else if (level1_elem->pos != pos)
1447 av_log(matroska->ctx, AV_LOG_ERROR, "Duplicate element\n");
1448 level1_elem->parsed = 1;
1450 if (res = ebml_parse_nest(matroska, syntax->def.n, data))
1459 if (ffio_limit(pb, length) != length) {
1460 // ffio_limit emits its own error message,
1461 // so we don't have to.
1462 return AVERROR(EIO);
1464 if ((res2 = avio_skip(pb, length - 1)) >= 0) {
1465 // avio_skip might take us past EOF. We check for this
1466 // by skipping only length - 1 bytes, reading a byte and
1467 // checking the error flags. This is done in order to check
1468 // that the element has been properly skipped even when
1469 // no filesize (that ffio_limit relies on) is available.
1471 res = NEEDS_CHECKING;
1478 if (res == NEEDS_CHECKING) {
1479 if (pb->eof_reached) {
1488 if (res == AVERROR_INVALIDDATA)
1489 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
1490 else if (res == AVERROR(EIO))
1491 av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
1492 else if (res == AVERROR_EOF) {
1493 av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely\n");
1501 if (syntax->is_counted && data) {
1502 CountedElement *elem = data;
1503 if (elem->count != UINT_MAX)
1507 if (level_check == LEVEL_ENDED && matroska->num_levels) {
1508 level = &matroska->levels[matroska->num_levels - 1];
1509 pos = avio_tell(pb);
1511 // Given that pos >= level->start no check for
1512 // level->length != EBML_UNKNOWN_LENGTH is necessary.
1513 while (matroska->num_levels && pos == level->start + level->length) {
1514 matroska->num_levels--;
1522 static void ebml_free(EbmlSyntax *syntax, void *data)
1525 for (i = 0; syntax[i].id; i++) {
1526 void *data_off = (char *) data + syntax[i].data_offset;
1527 switch (syntax[i].type) {
1533 av_buffer_unref(&((EbmlBin *) data_off)->buf);
1537 if (syntax[i].list_elem_size) {
1538 EbmlList *list = data_off;
1539 char *ptr = list->elem;
1540 for (j = 0; j < list->nb_elem;
1541 j++, ptr += syntax[i].list_elem_size)
1542 ebml_free(syntax[i].def.n, ptr);
1543 av_freep(&list->elem);
1545 list->alloc_elem_size = 0;
1547 ebml_free(syntax[i].def.n, data_off);
1557 static int matroska_probe(const AVProbeData *p)
1560 int len_mask = 0x80, size = 1, n = 1, i;
1563 if (AV_RB32(p->buf) != EBML_ID_HEADER)
1566 /* length of header */
1568 while (size <= 8 && !(total & len_mask)) {
1574 total &= (len_mask - 1);
1576 total = (total << 8) | p->buf[4 + n++];
1578 if (total + 1 == 1ULL << (7 * size)){
1579 /* Unknown-length header - simply parse the whole buffer. */
1580 total = p->buf_size - 4 - size;
1582 /* Does the probe data contain the whole header? */
1583 if (p->buf_size < 4 + size + total)
1587 /* The header should contain a known document type. For now,
1588 * we don't parse the whole header but simply check for the
1589 * availability of that array of characters inside the header.
1590 * Not fully fool-proof, but good enough. */
1591 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
1592 size_t probelen = strlen(matroska_doctypes[i]);
1593 if (total < probelen)
1595 for (n = 4 + size; n <= 4 + size + total - probelen; n++)
1596 if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
1597 return AVPROBE_SCORE_MAX;
1600 // probably valid EBML header but no recognized doctype
1601 return AVPROBE_SCORE_EXTENSION;
1604 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
1607 MatroskaTrack *tracks = matroska->tracks.elem;
1610 for (i = 0; i < matroska->tracks.nb_elem; i++)
1611 if (tracks[i].num == num)
1614 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %"PRIu64"\n", num);
1618 static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
1619 MatroskaTrack *track)
1621 MatroskaTrackEncoding *encodings = track->encodings.elem;
1622 uint8_t *data = *buf;
1623 int isize = *buf_size;
1624 uint8_t *pkt_data = NULL;
1625 uint8_t av_unused *newpktdata;
1626 int pkt_size = isize;
1630 if (pkt_size >= 10000000U)
1631 return AVERROR_INVALIDDATA;
1633 switch (encodings[0].compression.algo) {
1634 case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
1636 int header_size = encodings[0].compression.settings.size;
1637 uint8_t *header = encodings[0].compression.settings.data;
1639 if (header_size && !header) {
1640 av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
1647 pkt_size = isize + header_size;
1648 pkt_data = av_malloc(pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1650 return AVERROR(ENOMEM);
1652 memcpy(pkt_data, header, header_size);
1653 memcpy(pkt_data + header_size, data, isize);
1657 case MATROSKA_TRACK_ENCODING_COMP_LZO:
1660 olen = pkt_size *= 3;
1661 newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING
1662 + AV_INPUT_BUFFER_PADDING_SIZE);
1664 result = AVERROR(ENOMEM);
1667 pkt_data = newpktdata;
1668 result = av_lzo1x_decode(pkt_data, &olen, data, &insize);
1669 } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
1671 result = AVERROR_INVALIDDATA;
1678 case MATROSKA_TRACK_ENCODING_COMP_ZLIB:
1680 z_stream zstream = { 0 };
1681 if (inflateInit(&zstream) != Z_OK)
1683 zstream.next_in = data;
1684 zstream.avail_in = isize;
1687 newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1689 inflateEnd(&zstream);
1690 result = AVERROR(ENOMEM);
1693 pkt_data = newpktdata;
1694 zstream.avail_out = pkt_size - zstream.total_out;
1695 zstream.next_out = pkt_data + zstream.total_out;
1696 result = inflate(&zstream, Z_NO_FLUSH);
1697 } while (result == Z_OK && pkt_size < 10000000);
1698 pkt_size = zstream.total_out;
1699 inflateEnd(&zstream);
1700 if (result != Z_STREAM_END) {
1701 if (result == Z_MEM_ERROR)
1702 result = AVERROR(ENOMEM);
1704 result = AVERROR_INVALIDDATA;
1711 case MATROSKA_TRACK_ENCODING_COMP_BZLIB:
1713 bz_stream bzstream = { 0 };
1714 if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1716 bzstream.next_in = data;
1717 bzstream.avail_in = isize;
1720 newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1722 BZ2_bzDecompressEnd(&bzstream);
1723 result = AVERROR(ENOMEM);
1726 pkt_data = newpktdata;
1727 bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1728 bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1729 result = BZ2_bzDecompress(&bzstream);
1730 } while (result == BZ_OK && pkt_size < 10000000);
1731 pkt_size = bzstream.total_out_lo32;
1732 BZ2_bzDecompressEnd(&bzstream);
1733 if (result != BZ_STREAM_END) {
1734 if (result == BZ_MEM_ERROR)
1735 result = AVERROR(ENOMEM);
1737 result = AVERROR_INVALIDDATA;
1744 return AVERROR_INVALIDDATA;
1747 memset(pkt_data + pkt_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1750 *buf_size = pkt_size;
1758 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1759 AVDictionary **metadata, char *prefix)
1761 MatroskaTag *tags = list->elem;
1765 for (i = 0; i < list->nb_elem; i++) {
1766 const char *lang = tags[i].lang &&
1767 strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1769 if (!tags[i].name) {
1770 av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1774 snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1776 av_strlcpy(key, tags[i].name, sizeof(key));
1777 if (tags[i].def || !lang) {
1778 av_dict_set(metadata, key, tags[i].string, 0);
1779 if (tags[i].sub.nb_elem)
1780 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1783 av_strlcat(key, "-", sizeof(key));
1784 av_strlcat(key, lang, sizeof(key));
1785 av_dict_set(metadata, key, tags[i].string, 0);
1786 if (tags[i].sub.nb_elem)
1787 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1790 ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
1793 static void matroska_convert_tags(AVFormatContext *s)
1795 MatroskaDemuxContext *matroska = s->priv_data;
1796 MatroskaTags *tags = matroska->tags.elem;
1799 for (i = 0; i < matroska->tags.nb_elem; i++) {
1800 if (tags[i].target.attachuid) {
1801 MatroskaAttachment *attachment = matroska->attachments.elem;
1803 for (j = 0; j < matroska->attachments.nb_elem; j++) {
1804 if (attachment[j].uid == tags[i].target.attachuid &&
1805 attachment[j].stream) {
1806 matroska_convert_tag(s, &tags[i].tag,
1807 &attachment[j].stream->metadata, NULL);
1812 av_log(s, AV_LOG_WARNING,
1813 "The tags at index %d refer to a "
1814 "non-existent attachment %"PRId64".\n",
1815 i, tags[i].target.attachuid);
1817 } else if (tags[i].target.chapteruid) {
1818 MatroskaChapter *chapter = matroska->chapters.elem;
1820 for (j = 0; j < matroska->chapters.nb_elem; j++) {
1821 if (chapter[j].uid == tags[i].target.chapteruid &&
1822 chapter[j].chapter) {
1823 matroska_convert_tag(s, &tags[i].tag,
1824 &chapter[j].chapter->metadata, NULL);
1829 av_log(s, AV_LOG_WARNING,
1830 "The tags at index %d refer to a non-existent chapter "
1832 i, tags[i].target.chapteruid);
1834 } else if (tags[i].target.trackuid) {
1835 MatroskaTrack *track = matroska->tracks.elem;
1837 for (j = 0; j < matroska->tracks.nb_elem; j++) {
1838 if (track[j].uid == tags[i].target.trackuid &&
1840 matroska_convert_tag(s, &tags[i].tag,
1841 &track[j].stream->metadata, NULL);
1846 av_log(s, AV_LOG_WARNING,
1847 "The tags at index %d refer to a non-existent track "
1849 i, tags[i].target.trackuid);
1852 matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1853 tags[i].target.type);
1858 static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
1861 uint32_t saved_id = matroska->current_id;
1862 int64_t before_pos = avio_tell(matroska->ctx->pb);
1866 if (avio_seek(matroska->ctx->pb, pos, SEEK_SET) == pos) {
1867 /* We don't want to lose our seekhead level, so we add
1868 * a dummy. This is a crude hack. */
1869 if (matroska->num_levels == EBML_MAX_DEPTH) {
1870 av_log(matroska->ctx, AV_LOG_INFO,
1871 "Max EBML element depth (%d) reached, "
1872 "cannot parse further.\n", EBML_MAX_DEPTH);
1873 ret = AVERROR_INVALIDDATA;
1875 matroska->levels[matroska->num_levels] = (MatroskaLevel) { 0, EBML_UNKNOWN_LENGTH };
1876 matroska->num_levels++;
1877 matroska->current_id = 0;
1879 ret = ebml_parse(matroska, matroska_segment, matroska);
1880 if (ret == LEVEL_ENDED) {
1881 /* This can only happen if the seek brought us beyond EOF. */
1886 /* Seek back - notice that in all instances where this is used
1887 * it is safe to set the level to 1. */
1888 matroska_reset_status(matroska, saved_id, before_pos);
1893 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1895 EbmlList *seekhead_list = &matroska->seekhead;
1898 // we should not do any seeking in the streaming case
1899 if (!(matroska->ctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
1902 for (i = 0; i < seekhead_list->nb_elem; i++) {
1903 MatroskaSeekhead *seekheads = seekhead_list->elem;
1904 uint32_t id = seekheads[i].id;
1905 int64_t pos = seekheads[i].pos + matroska->segment_start;
1906 MatroskaLevel1Element *elem;
1908 if (id != seekheads[i].id || pos < matroska->segment_start)
1911 elem = matroska_find_level1_elem(matroska, id, pos);
1912 if (!elem || elem->parsed)
1917 // defer cues parsing until we actually need cue data.
1918 if (id == MATROSKA_ID_CUES)
1921 if (matroska_parse_seekhead_entry(matroska, pos) < 0) {
1922 // mark index as broken
1923 matroska->cues_parsing_deferred = -1;
1931 static void matroska_add_index_entries(MatroskaDemuxContext *matroska)
1933 EbmlList *index_list;
1934 MatroskaIndex *index;
1935 uint64_t index_scale = 1;
1938 if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1941 index_list = &matroska->index;
1942 index = index_list->elem;
1943 if (index_list->nb_elem < 2)
1945 if (index[1].time > 1E14 / matroska->time_scale) {
1946 av_log(matroska->ctx, AV_LOG_WARNING, "Dropping apparently-broken index.\n");
1949 for (i = 0; i < index_list->nb_elem; i++) {
1950 EbmlList *pos_list = &index[i].pos;
1951 MatroskaIndexPos *pos = pos_list->elem;
1952 for (j = 0; j < pos_list->nb_elem; j++) {
1953 MatroskaTrack *track = matroska_find_track_by_num(matroska,
1955 if (track && track->stream)
1956 av_add_index_entry(track->stream,
1957 pos[j].pos + matroska->segment_start,
1958 index[i].time / index_scale, 0, 0,
1964 static void matroska_parse_cues(MatroskaDemuxContext *matroska) {
1967 if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1970 for (i = 0; i < matroska->num_level1_elems; i++) {
1971 MatroskaLevel1Element *elem = &matroska->level1_elems[i];
1972 if (elem->id == MATROSKA_ID_CUES && !elem->parsed) {
1973 if (matroska_parse_seekhead_entry(matroska, elem->pos) < 0)
1974 matroska->cues_parsing_deferred = -1;
1980 matroska_add_index_entries(matroska);
1983 static int matroska_aac_profile(char *codec_id)
1985 static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
1988 for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
1989 if (strstr(codec_id, aac_profiles[profile]))
1994 static int matroska_aac_sri(int samplerate)
1998 for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
1999 if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
2004 static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
2006 /* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
2007 avpriv_dict_set_timestamp(metadata, "creation_time", date_utc / 1000 + 978307200000000LL);
2010 static int matroska_parse_flac(AVFormatContext *s,
2011 MatroskaTrack *track,
2014 AVStream *st = track->stream;
2015 uint8_t *p = track->codec_priv.data;
2016 int size = track->codec_priv.size;
2018 if (size < 8 + FLAC_STREAMINFO_SIZE || p[4] & 0x7f) {
2019 av_log(s, AV_LOG_WARNING, "Invalid FLAC private data\n");
2020 track->codec_priv.size = 0;
2024 track->codec_priv.size = 8 + FLAC_STREAMINFO_SIZE;
2026 p += track->codec_priv.size;
2027 size -= track->codec_priv.size;
2029 /* parse the remaining metadata blocks if present */
2031 int block_last, block_type, block_size;
2033 flac_parse_block_header(p, &block_last, &block_type, &block_size);
2037 if (block_size > size)
2040 /* check for the channel mask */
2041 if (block_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
2042 AVDictionary *dict = NULL;
2043 AVDictionaryEntry *chmask;
2045 ff_vorbis_comment(s, &dict, p, block_size, 0);
2046 chmask = av_dict_get(dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
2048 uint64_t mask = strtol(chmask->value, NULL, 0);
2049 if (!mask || mask & ~0x3ffffULL) {
2050 av_log(s, AV_LOG_WARNING,
2051 "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
2053 st->codecpar->channel_layout = mask;
2055 av_dict_free(&dict);
2065 static int mkv_field_order(MatroskaDemuxContext *matroska, int64_t field_order)
2067 int minor, micro, bttb = 0;
2069 /* workaround a bug in our Matroska muxer, introduced in version 57.36 alongside
2070 * this function, and fixed in 57.52 */
2071 if (matroska->muxingapp && sscanf(matroska->muxingapp, "Lavf57.%d.%d", &minor, µ) == 2)
2072 bttb = (minor >= 36 && minor <= 51 && micro >= 100);
2074 switch (field_order) {
2075 case MATROSKA_VIDEO_FIELDORDER_PROGRESSIVE:
2076 return AV_FIELD_PROGRESSIVE;
2077 case MATROSKA_VIDEO_FIELDORDER_UNDETERMINED:
2078 return AV_FIELD_UNKNOWN;
2079 case MATROSKA_VIDEO_FIELDORDER_TT:
2081 case MATROSKA_VIDEO_FIELDORDER_BB:
2083 case MATROSKA_VIDEO_FIELDORDER_BT:
2084 return bttb ? AV_FIELD_TB : AV_FIELD_BT;
2085 case MATROSKA_VIDEO_FIELDORDER_TB:
2086 return bttb ? AV_FIELD_BT : AV_FIELD_TB;
2088 return AV_FIELD_UNKNOWN;
2092 static void mkv_stereo_mode_display_mul(int stereo_mode,
2093 int *h_width, int *h_height)
2095 switch (stereo_mode) {
2096 case MATROSKA_VIDEO_STEREOMODE_TYPE_MONO:
2097 case MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_RL:
2098 case MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR:
2099 case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_RL:
2100 case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR:
2102 case MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT:
2103 case MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT:
2104 case MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_RL:
2105 case MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR:
2108 case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTTOM_TOP:
2109 case MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM:
2110 case MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_RL:
2111 case MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR:
2117 static int mkv_parse_video_color(AVStream *st, const MatroskaTrack *track) {
2118 const MatroskaTrackVideoColor *color = track->video.color.elem;
2119 const MatroskaMasteringMeta *mastering_meta;
2120 int has_mastering_primaries, has_mastering_luminance;
2122 if (!track->video.color.nb_elem)
2125 mastering_meta = &color->mastering_meta;
2126 // Mastering primaries are CIE 1931 coords, and must be > 0.
2127 has_mastering_primaries =
2128 mastering_meta->r_x > 0 && mastering_meta->r_y > 0 &&
2129 mastering_meta->g_x > 0 && mastering_meta->g_y > 0 &&
2130 mastering_meta->b_x > 0 && mastering_meta->b_y > 0 &&
2131 mastering_meta->white_x > 0 && mastering_meta->white_y > 0;
2132 has_mastering_luminance = mastering_meta->max_luminance >
2133 mastering_meta->min_luminance.el.f &&
2134 mastering_meta->min_luminance.el.f >= 0 &&
2135 mastering_meta->min_luminance.count;
2137 if (color->matrix_coefficients != AVCOL_SPC_RESERVED)
2138 st->codecpar->color_space = color->matrix_coefficients;
2139 if (color->primaries != AVCOL_PRI_RESERVED &&
2140 color->primaries != AVCOL_PRI_RESERVED0)
2141 st->codecpar->color_primaries = color->primaries;
2142 if (color->transfer_characteristics != AVCOL_TRC_RESERVED &&
2143 color->transfer_characteristics != AVCOL_TRC_RESERVED0)
2144 st->codecpar->color_trc = color->transfer_characteristics;
2145 if (color->range != AVCOL_RANGE_UNSPECIFIED &&
2146 color->range <= AVCOL_RANGE_JPEG)
2147 st->codecpar->color_range = color->range;
2148 if (color->chroma_siting_horz != MATROSKA_COLOUR_CHROMASITINGHORZ_UNDETERMINED &&
2149 color->chroma_siting_vert != MATROSKA_COLOUR_CHROMASITINGVERT_UNDETERMINED &&
2150 color->chroma_siting_horz < MATROSKA_COLOUR_CHROMASITINGHORZ_NB &&
2151 color->chroma_siting_vert < MATROSKA_COLOUR_CHROMASITINGVERT_NB) {
2152 st->codecpar->chroma_location =
2153 avcodec_chroma_pos_to_enum((color->chroma_siting_horz - 1) << 7,
2154 (color->chroma_siting_vert - 1) << 7);
2156 if (color->max_cll && color->max_fall) {
2159 AVContentLightMetadata *metadata = av_content_light_metadata_alloc(&size);
2161 return AVERROR(ENOMEM);
2162 ret = av_stream_add_side_data(st, AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
2163 (uint8_t *)metadata, size);
2165 av_freep(&metadata);
2168 metadata->MaxCLL = color->max_cll;
2169 metadata->MaxFALL = color->max_fall;
2172 if (has_mastering_primaries || has_mastering_luminance) {
2173 AVMasteringDisplayMetadata *metadata =
2174 (AVMasteringDisplayMetadata*) av_stream_new_side_data(
2175 st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
2176 sizeof(AVMasteringDisplayMetadata));
2178 return AVERROR(ENOMEM);
2180 memset(metadata, 0, sizeof(AVMasteringDisplayMetadata));
2181 if (has_mastering_primaries) {
2182 metadata->display_primaries[0][0] = av_d2q(mastering_meta->r_x, INT_MAX);
2183 metadata->display_primaries[0][1] = av_d2q(mastering_meta->r_y, INT_MAX);
2184 metadata->display_primaries[1][0] = av_d2q(mastering_meta->g_x, INT_MAX);
2185 metadata->display_primaries[1][1] = av_d2q(mastering_meta->g_y, INT_MAX);
2186 metadata->display_primaries[2][0] = av_d2q(mastering_meta->b_x, INT_MAX);
2187 metadata->display_primaries[2][1] = av_d2q(mastering_meta->b_y, INT_MAX);
2188 metadata->white_point[0] = av_d2q(mastering_meta->white_x, INT_MAX);
2189 metadata->white_point[1] = av_d2q(mastering_meta->white_y, INT_MAX);
2190 metadata->has_primaries = 1;
2192 if (has_mastering_luminance) {
2193 metadata->max_luminance = av_d2q(mastering_meta->max_luminance, INT_MAX);
2194 metadata->min_luminance = av_d2q(mastering_meta->min_luminance.el.f, INT_MAX);
2195 metadata->has_luminance = 1;
2201 static int mkv_parse_video_projection(AVStream *st, const MatroskaTrack *track,
2204 AVSphericalMapping *spherical;
2205 const MatroskaTrackVideoProjection *mkv_projection = &track->video.projection;
2206 const uint8_t *priv_data = mkv_projection->private.data;
2207 enum AVSphericalProjection projection;
2208 size_t spherical_size;
2209 uint32_t l = 0, t = 0, r = 0, b = 0;
2210 uint32_t padding = 0;
2213 if (mkv_projection->private.size && priv_data[0] != 0) {
2214 av_log(logctx, AV_LOG_WARNING, "Unknown spherical metadata\n");
2218 switch (track->video.projection.type) {
2219 case MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR:
2220 if (track->video.projection.private.size == 20) {
2221 t = AV_RB32(priv_data + 4);
2222 b = AV_RB32(priv_data + 8);
2223 l = AV_RB32(priv_data + 12);
2224 r = AV_RB32(priv_data + 16);
2226 if (b >= UINT_MAX - t || r >= UINT_MAX - l) {
2227 av_log(logctx, AV_LOG_ERROR,
2228 "Invalid bounding rectangle coordinates "
2229 "%"PRIu32",%"PRIu32",%"PRIu32",%"PRIu32"\n",
2231 return AVERROR_INVALIDDATA;
2233 } else if (track->video.projection.private.size != 0) {
2234 av_log(logctx, AV_LOG_ERROR, "Unknown spherical metadata\n");
2235 return AVERROR_INVALIDDATA;
2238 if (l || t || r || b)
2239 projection = AV_SPHERICAL_EQUIRECTANGULAR_TILE;
2241 projection = AV_SPHERICAL_EQUIRECTANGULAR;
2243 case MATROSKA_VIDEO_PROJECTION_TYPE_CUBEMAP:
2244 if (track->video.projection.private.size < 4) {
2245 av_log(logctx, AV_LOG_ERROR, "Missing projection private properties\n");
2246 return AVERROR_INVALIDDATA;
2247 } else if (track->video.projection.private.size == 12) {
2248 uint32_t layout = AV_RB32(priv_data + 4);
2250 av_log(logctx, AV_LOG_WARNING,
2251 "Unknown spherical cubemap layout %"PRIu32"\n", layout);
2254 projection = AV_SPHERICAL_CUBEMAP;
2255 padding = AV_RB32(priv_data + 8);
2257 av_log(logctx, AV_LOG_ERROR, "Unknown spherical metadata\n");
2258 return AVERROR_INVALIDDATA;
2261 case MATROSKA_VIDEO_PROJECTION_TYPE_RECTANGULAR:
2262 /* No Spherical metadata */
2265 av_log(logctx, AV_LOG_WARNING,
2266 "Unknown spherical metadata type %"PRIu64"\n",
2267 track->video.projection.type);
2271 spherical = av_spherical_alloc(&spherical_size);
2273 return AVERROR(ENOMEM);
2275 spherical->projection = projection;
2277 spherical->yaw = (int32_t) (track->video.projection.yaw * (1 << 16));
2278 spherical->pitch = (int32_t) (track->video.projection.pitch * (1 << 16));
2279 spherical->roll = (int32_t) (track->video.projection.roll * (1 << 16));
2281 spherical->padding = padding;
2283 spherical->bound_left = l;
2284 spherical->bound_top = t;
2285 spherical->bound_right = r;
2286 spherical->bound_bottom = b;
2288 ret = av_stream_add_side_data(st, AV_PKT_DATA_SPHERICAL, (uint8_t *)spherical,
2291 av_freep(&spherical);
2298 static int get_qt_codec(MatroskaTrack *track, uint32_t *fourcc, enum AVCodecID *codec_id)
2300 const AVCodecTag *codec_tags;
2302 codec_tags = track->type == MATROSKA_TRACK_TYPE_VIDEO ?
2303 ff_codec_movvideo_tags : ff_codec_movaudio_tags;
2305 /* Normalize noncompliant private data that starts with the fourcc
2306 * by expanding/shifting the data by 4 bytes and storing the data
2307 * size at the start. */
2308 if (ff_codec_get_id(codec_tags, AV_RL32(track->codec_priv.data))) {
2309 int ret = av_buffer_realloc(&track->codec_priv.buf,
2310 track->codec_priv.size + 4 + AV_INPUT_BUFFER_PADDING_SIZE);
2314 track->codec_priv.data = track->codec_priv.buf->data;
2315 memmove(track->codec_priv.data + 4, track->codec_priv.data, track->codec_priv.size);
2316 track->codec_priv.size += 4;
2317 AV_WB32(track->codec_priv.data, track->codec_priv.size);
2320 *fourcc = AV_RL32(track->codec_priv.data + 4);
2321 *codec_id = ff_codec_get_id(codec_tags, *fourcc);
2326 static int matroska_parse_tracks(AVFormatContext *s)
2328 MatroskaDemuxContext *matroska = s->priv_data;
2329 MatroskaTrack *tracks = matroska->tracks.elem;
2334 for (i = 0; i < matroska->tracks.nb_elem; i++) {
2335 MatroskaTrack *track = &tracks[i];
2336 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
2337 EbmlList *encodings_list = &track->encodings;
2338 MatroskaTrackEncoding *encodings = encodings_list->elem;
2339 uint8_t *extradata = NULL;
2340 int extradata_size = 0;
2341 int extradata_offset = 0;
2342 uint32_t fourcc = 0;
2344 char* key_id_base64 = NULL;
2347 /* Apply some sanity checks. */
2348 if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
2349 track->type != MATROSKA_TRACK_TYPE_AUDIO &&
2350 track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
2351 track->type != MATROSKA_TRACK_TYPE_METADATA) {
2352 av_log(matroska->ctx, AV_LOG_INFO,
2353 "Unknown or unsupported track type %"PRIu64"\n",
2357 if (!track->codec_id)
2360 if ( track->type == MATROSKA_TRACK_TYPE_AUDIO && track->codec_id[0] != 'A'
2361 || track->type == MATROSKA_TRACK_TYPE_VIDEO && track->codec_id[0] != 'V'
2362 || track->type == MATROSKA_TRACK_TYPE_SUBTITLE && track->codec_id[0] != 'D' && track->codec_id[0] != 'S'
2363 || track->type == MATROSKA_TRACK_TYPE_METADATA && track->codec_id[0] != 'D' && track->codec_id[0] != 'S'
2365 av_log(matroska->ctx, AV_LOG_INFO, "Inconsistent track type\n");
2369 if (track->audio.samplerate < 0 || track->audio.samplerate > INT_MAX ||
2370 isnan(track->audio.samplerate)) {
2371 av_log(matroska->ctx, AV_LOG_WARNING,
2372 "Invalid sample rate %f, defaulting to 8000 instead.\n",
2373 track->audio.samplerate);
2374 track->audio.samplerate = 8000;
2377 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2378 if (!track->default_duration && track->video.frame_rate > 0) {
2379 double default_duration = 1000000000 / track->video.frame_rate;
2380 if (default_duration > UINT64_MAX || default_duration < 0) {
2381 av_log(matroska->ctx, AV_LOG_WARNING,
2382 "Invalid frame rate %e. Cannot calculate default duration.\n",
2383 track->video.frame_rate);
2385 track->default_duration = default_duration;
2388 if (track->video.display_width == -1)
2389 track->video.display_width = track->video.pixel_width;
2390 if (track->video.display_height == -1)
2391 track->video.display_height = track->video.pixel_height;
2392 if (track->video.color_space.size == 4)
2393 fourcc = AV_RL32(track->video.color_space.data);
2394 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2395 if (!track->audio.out_samplerate)
2396 track->audio.out_samplerate = track->audio.samplerate;
2398 if (encodings_list->nb_elem > 1) {
2399 av_log(matroska->ctx, AV_LOG_ERROR,
2400 "Multiple combined encodings not supported");
2401 } else if (encodings_list->nb_elem == 1) {
2402 if (encodings[0].type) {
2403 if (encodings[0].encryption.key_id.size > 0) {
2404 /* Save the encryption key id to be stored later as a
2406 const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
2407 key_id_base64 = av_malloc(b64_size);
2408 if (key_id_base64 == NULL)
2409 return AVERROR(ENOMEM);
2411 av_base64_encode(key_id_base64, b64_size,
2412 encodings[0].encryption.key_id.data,
2413 encodings[0].encryption.key_id.size);
2415 encodings[0].scope = 0;
2416 av_log(matroska->ctx, AV_LOG_ERROR,
2417 "Unsupported encoding type");
2421 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
2424 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
2427 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO &&
2429 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP) {
2430 encodings[0].scope = 0;
2431 av_log(matroska->ctx, AV_LOG_ERROR,
2432 "Unsupported encoding type");
2433 } else if (track->codec_priv.size && encodings[0].scope & 2) {
2434 uint8_t *codec_priv = track->codec_priv.data;
2435 int ret = matroska_decode_buffer(&track->codec_priv.data,
2436 &track->codec_priv.size,
2439 track->codec_priv.data = NULL;
2440 track->codec_priv.size = 0;
2441 av_log(matroska->ctx, AV_LOG_ERROR,
2442 "Failed to decode codec private data\n");
2445 if (codec_priv != track->codec_priv.data) {
2446 av_buffer_unref(&track->codec_priv.buf);
2447 if (track->codec_priv.data) {
2448 track->codec_priv.buf = av_buffer_create(track->codec_priv.data,
2449 track->codec_priv.size + AV_INPUT_BUFFER_PADDING_SIZE,
2451 if (!track->codec_priv.buf) {
2452 av_freep(&track->codec_priv.data);
2453 track->codec_priv.size = 0;
2454 return AVERROR(ENOMEM);
2460 track->needs_decoding = encodings && !encodings[0].type &&
2461 encodings[0].scope & 1 &&
2462 (encodings[0].compression.algo !=
2463 MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP ||
2464 encodings[0].compression.settings.size);
2466 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
2467 if (!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
2468 strlen(ff_mkv_codec_tags[j].str))) {
2469 codec_id = ff_mkv_codec_tags[j].id;
2474 st = track->stream = avformat_new_stream(s, NULL);
2476 av_free(key_id_base64);
2477 return AVERROR(ENOMEM);
2480 if (key_id_base64) {
2481 /* export encryption key id as base64 metadata tag */
2482 av_dict_set(&st->metadata, "enc_key_id", key_id_base64,
2483 AV_DICT_DONT_STRDUP_VAL);
2486 if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
2487 track->codec_priv.size >= 40 &&
2488 track->codec_priv.data) {
2489 track->ms_compat = 1;
2490 bit_depth = AV_RL16(track->codec_priv.data + 14);
2491 fourcc = AV_RL32(track->codec_priv.data + 16);
2492 codec_id = ff_codec_get_id(ff_codec_bmp_tags,
2495 codec_id = ff_codec_get_id(ff_codec_movvideo_tags,
2497 extradata_offset = 40;
2498 } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
2499 track->codec_priv.size >= 14 &&
2500 track->codec_priv.data) {
2502 ffio_init_context(&b, track->codec_priv.data,
2503 track->codec_priv.size,
2504 0, NULL, NULL, NULL, NULL);
2505 ret = ff_get_wav_header(s, &b, st->codecpar, track->codec_priv.size, 0);
2508 codec_id = st->codecpar->codec_id;
2509 fourcc = st->codecpar->codec_tag;
2510 extradata_offset = FFMIN(track->codec_priv.size, 18);
2511 } else if (!strcmp(track->codec_id, "A_QUICKTIME")
2512 /* Normally 36, but allow noncompliant private data */
2513 && (track->codec_priv.size >= 32)
2514 && (track->codec_priv.data)) {
2515 uint16_t sample_size;
2516 int ret = get_qt_codec(track, &fourcc, &codec_id);
2519 sample_size = AV_RB16(track->codec_priv.data + 26);
2521 if (sample_size == 8) {
2522 fourcc = MKTAG('r','a','w',' ');
2523 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2524 } else if (sample_size == 16) {
2525 fourcc = MKTAG('t','w','o','s');
2526 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2529 if ((fourcc == MKTAG('t','w','o','s') ||
2530 fourcc == MKTAG('s','o','w','t')) &&
2532 codec_id = AV_CODEC_ID_PCM_S8;
2533 } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
2534 (track->codec_priv.size >= 21) &&
2535 (track->codec_priv.data)) {
2536 int ret = get_qt_codec(track, &fourcc, &codec_id);
2539 if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI ")) {
2540 fourcc = MKTAG('S','V','Q','3');
2541 codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
2543 if (codec_id == AV_CODEC_ID_NONE)
2544 av_log(matroska->ctx, AV_LOG_ERROR,
2545 "mov FourCC not found %s.\n", av_fourcc2str(fourcc));
2546 if (track->codec_priv.size >= 86) {
2547 bit_depth = AV_RB16(track->codec_priv.data + 82);
2548 ffio_init_context(&b, track->codec_priv.data,
2549 track->codec_priv.size,
2550 0, NULL, NULL, NULL, NULL);
2551 if (ff_get_qtpalette(codec_id, &b, track->palette)) {
2553 track->has_palette = 1;
2556 } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
2557 switch (track->audio.bitdepth) {
2559 codec_id = AV_CODEC_ID_PCM_U8;
2562 codec_id = AV_CODEC_ID_PCM_S24BE;
2565 codec_id = AV_CODEC_ID_PCM_S32BE;
2568 } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
2569 switch (track->audio.bitdepth) {
2571 codec_id = AV_CODEC_ID_PCM_U8;
2574 codec_id = AV_CODEC_ID_PCM_S24LE;
2577 codec_id = AV_CODEC_ID_PCM_S32LE;
2580 } else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
2581 track->audio.bitdepth == 64) {
2582 codec_id = AV_CODEC_ID_PCM_F64LE;
2583 } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
2584 int profile = matroska_aac_profile(track->codec_id);
2585 int sri = matroska_aac_sri(track->audio.samplerate);
2586 extradata = av_mallocz(5 + AV_INPUT_BUFFER_PADDING_SIZE);
2588 return AVERROR(ENOMEM);
2589 extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
2590 extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
2591 if (strstr(track->codec_id, "SBR")) {
2592 sri = matroska_aac_sri(track->audio.out_samplerate);
2593 extradata[2] = 0x56;
2594 extradata[3] = 0xE5;
2595 extradata[4] = 0x80 | (sri << 3);
2599 } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - AV_INPUT_BUFFER_PADDING_SIZE) {
2600 /* Only ALAC's magic cookie is stored in Matroska's track headers.
2601 * Create the "atom size", "tag", and "tag version" fields the
2602 * decoder expects manually. */
2603 extradata_size = 12 + track->codec_priv.size;
2604 extradata = av_mallocz(extradata_size +
2605 AV_INPUT_BUFFER_PADDING_SIZE);
2607 return AVERROR(ENOMEM);
2608 AV_WB32(extradata, extradata_size);
2609 memcpy(&extradata[4], "alac", 4);
2610 AV_WB32(&extradata[8], 0);
2611 memcpy(&extradata[12], track->codec_priv.data,
2612 track->codec_priv.size);
2613 } else if (codec_id == AV_CODEC_ID_TTA) {
2615 if (track->audio.channels > UINT16_MAX ||
2616 track->audio.bitdepth > UINT16_MAX) {
2617 av_log(matroska->ctx, AV_LOG_WARNING,
2618 "Too large audio channel number %"PRIu64
2619 " or bitdepth %"PRIu64". Skipping track.\n",
2620 track->audio.channels, track->audio.bitdepth);
2621 if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
2622 return AVERROR_INVALIDDATA;
2626 if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
2627 return AVERROR_INVALIDDATA;
2628 extradata_size = 22;
2629 extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
2631 return AVERROR(ENOMEM);
2633 bytestream_put_be32(&ptr, AV_RB32("TTA1"));
2634 bytestream_put_le16(&ptr, 1);
2635 bytestream_put_le16(&ptr, track->audio.channels);
2636 bytestream_put_le16(&ptr, track->audio.bitdepth);
2637 bytestream_put_le32(&ptr, track->audio.out_samplerate);
2638 bytestream_put_le32(&ptr, av_rescale(matroska->duration * matroska->time_scale,
2639 track->audio.out_samplerate,
2640 AV_TIME_BASE * 1000));
2641 } else if (codec_id == AV_CODEC_ID_RV10 ||
2642 codec_id == AV_CODEC_ID_RV20 ||
2643 codec_id == AV_CODEC_ID_RV30 ||
2644 codec_id == AV_CODEC_ID_RV40) {
2645 extradata_offset = 26;
2646 } else if (codec_id == AV_CODEC_ID_RA_144) {
2647 track->audio.out_samplerate = 8000;
2648 track->audio.channels = 1;
2649 } else if ((codec_id == AV_CODEC_ID_RA_288 ||
2650 codec_id == AV_CODEC_ID_COOK ||
2651 codec_id == AV_CODEC_ID_ATRAC3 ||
2652 codec_id == AV_CODEC_ID_SIPR)
2653 && track->codec_priv.data) {
2656 ffio_init_context(&b, track->codec_priv.data,
2657 track->codec_priv.size,
2658 0, NULL, NULL, NULL, NULL);
2660 flavor = avio_rb16(&b);
2661 track->audio.coded_framesize = avio_rb32(&b);
2663 track->audio.sub_packet_h = avio_rb16(&b);
2664 track->audio.frame_size = avio_rb16(&b);
2665 track->audio.sub_packet_size = avio_rb16(&b);
2666 if (track->audio.coded_framesize <= 0 ||
2667 track->audio.sub_packet_h <= 0 ||
2668 track->audio.frame_size <= 0)
2669 return AVERROR_INVALIDDATA;
2671 if (codec_id == AV_CODEC_ID_RA_288) {
2672 if (track->audio.sub_packet_h & 1 || 2 * track->audio.frame_size
2673 != (int64_t)track->audio.sub_packet_h * track->audio.coded_framesize)
2674 return AVERROR_INVALIDDATA;
2675 st->codecpar->block_align = track->audio.coded_framesize;
2676 track->codec_priv.size = 0;
2678 if (codec_id == AV_CODEC_ID_SIPR) {
2679 static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
2681 return AVERROR_INVALIDDATA;
2682 track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
2683 st->codecpar->bit_rate = sipr_bit_rate[flavor];
2684 } else if (track->audio.sub_packet_size <= 0 ||
2685 track->audio.frame_size % track->audio.sub_packet_size)
2686 return AVERROR_INVALIDDATA;
2687 st->codecpar->block_align = track->audio.sub_packet_size;
2688 extradata_offset = 78;
2690 track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
2691 track->audio.frame_size);
2692 if (!track->audio.buf)
2693 return AVERROR(ENOMEM);
2694 } else if (codec_id == AV_CODEC_ID_FLAC && track->codec_priv.size) {
2695 ret = matroska_parse_flac(s, track, &extradata_offset);
2698 } else if (codec_id == AV_CODEC_ID_WAVPACK && track->codec_priv.size < 2) {
2699 av_log(matroska->ctx, AV_LOG_INFO, "Assuming WavPack version 4.10 "
2700 "in absence of valid CodecPrivate.\n");
2702 extradata = av_mallocz(2 + AV_INPUT_BUFFER_PADDING_SIZE);
2704 return AVERROR(ENOMEM);
2705 AV_WL16(extradata, 0x410);
2706 } else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
2707 fourcc = AV_RL32(track->codec_priv.data);
2708 } else if (codec_id == AV_CODEC_ID_VP9 && track->codec_priv.size) {
2709 /* we don't need any value stored in CodecPrivate.
2710 make sure that it's not exported as extradata. */
2711 track->codec_priv.size = 0;
2712 } else if (codec_id == AV_CODEC_ID_AV1 && track->codec_priv.size) {
2713 /* For now, propagate only the OBUs, if any. Once libavcodec is
2714 updated to handle isobmff style extradata this can be removed. */
2715 extradata_offset = 4;
2717 track->codec_priv.size -= extradata_offset;
2719 if (codec_id == AV_CODEC_ID_NONE)
2720 av_log(matroska->ctx, AV_LOG_INFO,
2721 "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
2723 if (track->time_scale < 0.01) {
2724 av_log(matroska->ctx, AV_LOG_WARNING,
2725 "Track TimestampScale too small %f, assuming 1.0.\n",
2727 track->time_scale = 1.0;
2729 avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
2730 1000 * 1000 * 1000); /* 64 bit pts in ns */
2732 /* convert the delay from ns to the track timebase */
2733 track->codec_delay_in_track_tb = av_rescale_q(track->codec_delay,
2734 (AVRational){ 1, 1000000000 },
2737 st->codecpar->codec_id = codec_id;
2739 if (strcmp(track->language, "und"))
2740 av_dict_set(&st->metadata, "language", track->language, 0);
2741 av_dict_set(&st->metadata, "title", track->name, 0);
2743 if (track->flag_default)
2744 st->disposition |= AV_DISPOSITION_DEFAULT;
2745 if (track->flag_forced)
2746 st->disposition |= AV_DISPOSITION_FORCED;
2747 if (track->flag_comment)
2748 st->disposition |= AV_DISPOSITION_COMMENT;
2750 if (!st->codecpar->extradata) {
2752 st->codecpar->extradata = extradata;
2753 st->codecpar->extradata_size = extradata_size;
2754 } else if (track->codec_priv.data && track->codec_priv.size > 0) {
2755 if (ff_alloc_extradata(st->codecpar, track->codec_priv.size))
2756 return AVERROR(ENOMEM);
2757 memcpy(st->codecpar->extradata,
2758 track->codec_priv.data + extradata_offset,
2759 track->codec_priv.size);
2763 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2764 MatroskaTrackPlane *planes = track->operation.combine_planes.elem;
2765 int display_width_mul = 1;
2766 int display_height_mul = 1;
2768 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
2769 st->codecpar->codec_tag = fourcc;
2771 st->codecpar->bits_per_coded_sample = bit_depth;
2772 st->codecpar->width = track->video.pixel_width;
2773 st->codecpar->height = track->video.pixel_height;
2775 if (track->video.interlaced == MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED)
2776 st->codecpar->field_order = mkv_field_order(matroska, track->video.field_order);
2777 else if (track->video.interlaced == MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE)
2778 st->codecpar->field_order = AV_FIELD_PROGRESSIVE;
2780 if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
2781 mkv_stereo_mode_display_mul(track->video.stereo_mode, &display_width_mul, &display_height_mul);
2783 if (track->video.display_unit < MATROSKA_VIDEO_DISPLAYUNIT_UNKNOWN) {
2784 av_reduce(&st->sample_aspect_ratio.num,
2785 &st->sample_aspect_ratio.den,
2786 st->codecpar->height * track->video.display_width * display_width_mul,
2787 st->codecpar->width * track->video.display_height * display_height_mul,
2790 if (st->codecpar->codec_id != AV_CODEC_ID_HEVC)
2791 st->need_parsing = AVSTREAM_PARSE_HEADERS;
2793 if (track->default_duration) {
2794 av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
2795 1000000000, track->default_duration, 30000);
2796 #if FF_API_R_FRAME_RATE
2797 if ( st->avg_frame_rate.num < st->avg_frame_rate.den * 1000LL
2798 && st->avg_frame_rate.num > st->avg_frame_rate.den * 5LL)
2799 st->r_frame_rate = st->avg_frame_rate;
2803 /* export stereo mode flag as metadata tag */
2804 if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
2805 av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
2807 /* export alpha mode flag as metadata tag */
2808 if (track->video.alpha_mode)
2809 av_dict_set(&st->metadata, "alpha_mode", "1", 0);
2811 /* if we have virtual track, mark the real tracks */
2812 for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
2814 if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
2816 snprintf(buf, sizeof(buf), "%s_%d",
2817 ff_matroska_video_stereo_plane[planes[j].type], i);
2818 for (k=0; k < matroska->tracks.nb_elem; k++)
2819 if (planes[j].uid == tracks[k].uid && tracks[k].stream) {
2820 av_dict_set(&tracks[k].stream->metadata,
2821 "stereo_mode", buf, 0);
2825 // add stream level stereo3d side data if it is a supported format
2826 if (track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
2827 track->video.stereo_mode != 10 && track->video.stereo_mode != 12) {
2828 int ret = ff_mkv_stereo3d_conv(st, track->video.stereo_mode);
2833 ret = mkv_parse_video_color(st, track);
2836 ret = mkv_parse_video_projection(st, track, matroska->ctx);
2839 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2840 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
2841 st->codecpar->codec_tag = fourcc;
2842 st->codecpar->sample_rate = track->audio.out_samplerate;
2843 st->codecpar->channels = track->audio.channels;
2844 if (!st->codecpar->bits_per_coded_sample)
2845 st->codecpar->bits_per_coded_sample = track->audio.bitdepth;
2846 if (st->codecpar->codec_id == AV_CODEC_ID_MP3 ||
2847 st->codecpar->codec_id == AV_CODEC_ID_MLP ||
2848 st->codecpar->codec_id == AV_CODEC_ID_TRUEHD)
2849 st->need_parsing = AVSTREAM_PARSE_FULL;
2850 else if (st->codecpar->codec_id != AV_CODEC_ID_AAC)
2851 st->need_parsing = AVSTREAM_PARSE_HEADERS;
2852 if (track->codec_delay > 0) {
2853 st->codecpar->initial_padding = av_rescale_q(track->codec_delay,
2854 (AVRational){1, 1000000000},
2855 (AVRational){1, st->codecpar->codec_id == AV_CODEC_ID_OPUS ?
2856 48000 : st->codecpar->sample_rate});
2858 if (track->seek_preroll > 0) {
2859 st->codecpar->seek_preroll = av_rescale_q(track->seek_preroll,
2860 (AVRational){1, 1000000000},
2861 (AVRational){1, st->codecpar->sample_rate});
2863 } else if (codec_id == AV_CODEC_ID_WEBVTT) {
2864 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
2866 if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
2867 st->disposition |= AV_DISPOSITION_CAPTIONS;
2868 } else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
2869 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2870 } else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
2871 st->disposition |= AV_DISPOSITION_METADATA;
2873 } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2874 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
2881 static int matroska_read_header(AVFormatContext *s)
2883 MatroskaDemuxContext *matroska = s->priv_data;
2884 EbmlList *attachments_list = &matroska->attachments;
2885 EbmlList *chapters_list = &matroska->chapters;
2886 MatroskaAttachment *attachments;
2887 MatroskaChapter *chapters;
2888 uint64_t max_start = 0;
2894 matroska->cues_parsing_deferred = 1;
2896 /* First read the EBML header. */
2897 if (ebml_parse(matroska, ebml_syntax, &ebml) || !ebml.doctype) {
2898 av_log(matroska->ctx, AV_LOG_ERROR, "EBML header parsing failed\n");
2899 ebml_free(ebml_syntax, &ebml);
2900 return AVERROR_INVALIDDATA;
2902 if (ebml.version > EBML_VERSION ||
2903 ebml.max_size > sizeof(uint64_t) ||
2904 ebml.id_length > sizeof(uint32_t) ||
2905 ebml.doctype_version > 3) {
2906 avpriv_report_missing_feature(matroska->ctx,
2907 "EBML version %"PRIu64", doctype %s, doc version %"PRIu64,
2908 ebml.version, ebml.doctype, ebml.doctype_version);
2909 ebml_free(ebml_syntax, &ebml);
2910 return AVERROR_PATCHWELCOME;
2911 } else if (ebml.doctype_version == 3) {
2912 av_log(matroska->ctx, AV_LOG_WARNING,
2913 "EBML header using unsupported features\n"
2914 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2915 ebml.version, ebml.doctype, ebml.doctype_version);
2917 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
2918 if (!strcmp(ebml.doctype, matroska_doctypes[i]))
2920 if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
2921 av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
2922 if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
2923 ebml_free(ebml_syntax, &ebml);
2924 return AVERROR_INVALIDDATA;
2927 ebml_free(ebml_syntax, &ebml);
2929 /* The next thing is a segment. */
2930 pos = avio_tell(matroska->ctx->pb);
2931 res = ebml_parse(matroska, matroska_segments, matroska);
2932 // Try resyncing until we find an EBML_STOP type element.
2934 res = matroska_resync(matroska, pos);
2937 pos = avio_tell(matroska->ctx->pb);
2938 res = ebml_parse(matroska, matroska_segment, matroska);
2940 /* Set data_offset as it might be needed later by seek_frame_generic. */
2941 if (matroska->current_id == MATROSKA_ID_CLUSTER)
2942 s->internal->data_offset = avio_tell(matroska->ctx->pb) - 4;
2943 matroska_execute_seekhead(matroska);
2945 if (!matroska->time_scale)
2946 matroska->time_scale = 1000000;
2947 if (matroska->duration)
2948 matroska->ctx->duration = matroska->duration * matroska->time_scale *
2949 1000 / AV_TIME_BASE;
2950 av_dict_set(&s->metadata, "title", matroska->title, 0);
2951 av_dict_set(&s->metadata, "encoder", matroska->muxingapp, 0);
2953 if (matroska->date_utc.size == 8)
2954 matroska_metadata_creation_time(&s->metadata, AV_RB64(matroska->date_utc.data));
2956 res = matroska_parse_tracks(s);
2960 attachments = attachments_list->elem;
2961 for (j = 0; j < attachments_list->nb_elem; j++) {
2962 if (!(attachments[j].filename && attachments[j].mime &&
2963 attachments[j].bin.data && attachments[j].bin.size > 0)) {
2964 av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
2966 AVStream *st = avformat_new_stream(s, NULL);
2969 av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
2970 av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
2971 if (attachments[j].description)
2972 av_dict_set(&st->metadata, "title", attachments[j].description, 0);
2973 st->codecpar->codec_id = AV_CODEC_ID_NONE;
2975 for (i = 0; mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2976 if (!strncmp(mkv_image_mime_tags[i].str, attachments[j].mime,
2977 strlen(mkv_image_mime_tags[i].str))) {
2978 st->codecpar->codec_id = mkv_image_mime_tags[i].id;
2983 attachments[j].stream = st;
2985 if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
2986 AVPacket *pkt = &st->attached_pic;
2988 st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
2989 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
2991 av_init_packet(pkt);
2992 pkt->buf = attachments[j].bin.buf;
2993 attachments[j].bin.buf = NULL;
2994 pkt->data = attachments[j].bin.data;
2995 pkt->size = attachments[j].bin.size;
2996 pkt->stream_index = st->index;
2997 pkt->flags |= AV_PKT_FLAG_KEY;
2999 st->codecpar->codec_type = AVMEDIA_TYPE_ATTACHMENT;
3000 if (ff_alloc_extradata(st->codecpar, attachments[j].bin.size))
3002 memcpy(st->codecpar->extradata, attachments[j].bin.data,
3003 attachments[j].bin.size);
3005 for (i = 0; mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
3006 if (!strncmp(mkv_mime_tags[i].str, attachments[j].mime,
3007 strlen(mkv_mime_tags[i].str))) {
3008 st->codecpar->codec_id = mkv_mime_tags[i].id;
3016 chapters = chapters_list->elem;
3017 for (i = 0; i < chapters_list->nb_elem; i++)
3018 if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid &&
3019 (max_start == 0 || chapters[i].start > max_start)) {
3020 chapters[i].chapter =
3021 avpriv_new_chapter(s, chapters[i].uid,
3022 (AVRational) { 1, 1000000000 },
3023 chapters[i].start, chapters[i].end,
3025 max_start = chapters[i].start;
3028 matroska_add_index_entries(matroska);
3030 matroska_convert_tags(s);
3034 matroska_read_close(s);
3039 * Put one packet in an application-supplied AVPacket struct.
3040 * Returns 0 on success or -1 on failure.
3042 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
3045 if (matroska->queue) {
3046 MatroskaTrack *tracks = matroska->tracks.elem;
3047 MatroskaTrack *track;
3049 avpriv_packet_list_get(&matroska->queue, &matroska->queue_end, pkt);
3050 track = &tracks[pkt->stream_index];
3051 if (track->has_palette) {
3052 uint8_t *pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
3054 av_log(matroska->ctx, AV_LOG_ERROR, "Cannot append palette to packet\n");
3056 memcpy(pal, track->palette, AVPALETTE_SIZE);
3058 track->has_palette = 0;
3067 * Free all packets in our internal queue.
3069 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
3071 avpriv_packet_list_free(&matroska->queue, &matroska->queue_end);
3074 static int matroska_parse_laces(MatroskaDemuxContext *matroska, uint8_t **buf,
3075 int size, int type, AVIOContext *pb,
3076 uint32_t lace_size[256], int *laces)
3079 uint8_t *data = *buf;
3083 lace_size[0] = size;
3088 return AVERROR_INVALIDDATA;
3095 case 0x1: /* Xiph lacing */
3099 for (n = 0; n < *laces - 1; n++) {
3104 return AVERROR_INVALIDDATA;
3107 lace_size[n] += temp;
3110 } while (temp == 0xff);
3113 return AVERROR_INVALIDDATA;
3115 lace_size[n] = size - total;
3119 case 0x2: /* fixed-size lacing */
3120 if (size % (*laces))
3121 return AVERROR_INVALIDDATA;
3122 for (n = 0; n < *laces; n++)
3123 lace_size[n] = size / *laces;
3126 case 0x3: /* EBML lacing */
3134 n = ebml_read_num(matroska, pb, 8, &num, 1);
3138 return AVERROR_INVALIDDATA;
3140 total = lace_size[0] = num;
3142 for (n = 1; n < *laces - 1; n++) {
3145 r = matroska_ebmlnum_sint(matroska, pb, &snum);
3148 if (lace_size[n - 1] + snum > (uint64_t)INT_MAX)
3149 return AVERROR_INVALIDDATA;
3151 lace_size[n] = lace_size[n - 1] + snum;
3152 total += lace_size[n];
3158 return AVERROR_INVALIDDATA;
3160 lace_size[*laces - 1] = size - total;
3170 static int matroska_parse_rm_audio(MatroskaDemuxContext *matroska,
3171 MatroskaTrack *track, AVStream *st,
3172 uint8_t *data, int size, uint64_t timecode,
3175 const int a = st->codecpar->block_align;
3176 const int sps = track->audio.sub_packet_size;
3177 const int cfs = track->audio.coded_framesize;
3178 const int h = track->audio.sub_packet_h;
3179 const int w = track->audio.frame_size;
3180 int y = track->audio.sub_packet_cnt;
3183 if (!track->audio.pkt_cnt) {
3184 if (track->audio.sub_packet_cnt == 0)
3185 track->audio.buf_timecode = timecode;
3186 if (st->codecpar->codec_id == AV_CODEC_ID_RA_288) {
3187 if (size < cfs * h / 2) {
3188 av_log(matroska->ctx, AV_LOG_ERROR,
3189 "Corrupt int4 RM-style audio packet size\n");
3190 return AVERROR_INVALIDDATA;
3192 for (x = 0; x < h / 2; x++)
3193 memcpy(track->audio.buf + x * 2 * w + y * cfs,
3194 data + x * cfs, cfs);
3195 } else if (st->codecpar->codec_id == AV_CODEC_ID_SIPR) {
3197 av_log(matroska->ctx, AV_LOG_ERROR,
3198 "Corrupt sipr RM-style audio packet size\n");
3199 return AVERROR_INVALIDDATA;
3201 memcpy(track->audio.buf + y * w, data, w);
3204 av_log(matroska->ctx, AV_LOG_ERROR,
3205 "Corrupt generic RM-style audio packet size\n");
3206 return AVERROR_INVALIDDATA;
3208 for (x = 0; x < w / sps; x++)
3209 memcpy(track->audio.buf +
3210 sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)),
3211 data + x * sps, sps);
3214 if (++track->audio.sub_packet_cnt >= h) {
3215 if (st->codecpar->codec_id == AV_CODEC_ID_SIPR)
3216 ff_rm_reorder_sipr_data(track->audio.buf, h, w);
3217 track->audio.sub_packet_cnt = 0;
3218 track->audio.pkt_cnt = h * w / a;
3222 while (track->audio.pkt_cnt) {
3224 AVPacket pktl, *pkt = &pktl;
3226 ret = av_new_packet(pkt, a);
3231 track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--),
3233 pkt->pts = track->audio.buf_timecode;
3234 track->audio.buf_timecode = AV_NOPTS_VALUE;
3236 pkt->stream_index = st->index;
3237 ret = avpriv_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, NULL, 0);
3239 av_packet_unref(pkt);
3240 return AVERROR(ENOMEM);
3247 /* reconstruct full wavpack blocks from mangled matroska ones */
3248 static int matroska_parse_wavpack(MatroskaTrack *track,
3249 uint8_t **data, int *size)
3251 uint8_t *dst = NULL;
3252 uint8_t *src = *data;
3257 int ret, offset = 0;
3260 return AVERROR_INVALIDDATA;
3262 av_assert1(track->stream->codecpar->extradata_size >= 2);
3263 ver = AV_RL16(track->stream->codecpar->extradata);
3265 samples = AV_RL32(src);
3269 while (srclen >= 8) {
3274 uint32_t flags = AV_RL32(src);
3275 uint32_t crc = AV_RL32(src + 4);
3279 multiblock = (flags & 0x1800) != 0x1800;
3282 ret = AVERROR_INVALIDDATA;
3285 blocksize = AV_RL32(src);
3291 if (blocksize > srclen) {
3292 ret = AVERROR_INVALIDDATA;
3296 tmp = av_realloc(dst, dstlen + blocksize + 32 + AV_INPUT_BUFFER_PADDING_SIZE);
3298 ret = AVERROR(ENOMEM);
3302 dstlen += blocksize + 32;
3304 AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag
3305 AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8
3306 AV_WL16(dst + offset + 8, ver); // version
3307 AV_WL16(dst + offset + 10, 0); // track/index_no
3308 AV_WL32(dst + offset + 12, 0); // total samples
3309 AV_WL32(dst + offset + 16, 0); // block index
3310 AV_WL32(dst + offset + 20, samples); // number of samples
3311 AV_WL32(dst + offset + 24, flags); // flags
3312 AV_WL32(dst + offset + 28, crc); // crc
3313 memcpy(dst + offset + 32, src, blocksize); // block data
3316 srclen -= blocksize;
3317 offset += blocksize + 32;
3320 memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3332 static int matroska_parse_prores(MatroskaTrack *track,
3333 uint8_t **data, int *size)
3336 int dstlen = *size + 8;
3338 dst = av_malloc(dstlen + AV_INPUT_BUFFER_PADDING_SIZE);
3340 return AVERROR(ENOMEM);
3342 AV_WB32(dst, dstlen);
3343 AV_WB32(dst + 4, MKBETAG('i', 'c', 'p', 'f'));
3344 memcpy(dst + 8, *data, dstlen - 8);
3345 memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3353 static int matroska_parse_webvtt(MatroskaDemuxContext *matroska,
3354 MatroskaTrack *track,
3356 uint8_t *data, int data_len,
3361 AVPacket pktl, *pkt = &pktl;
3362 uint8_t *id, *settings, *text, *buf;
3363 int id_len, settings_len, text_len;
3368 return AVERROR_INVALIDDATA;
3371 q = data + data_len;
3376 if (*p == '\r' || *p == '\n') {
3385 if (p >= q || *p != '\n')
3386 return AVERROR_INVALIDDATA;
3392 if (*p == '\r' || *p == '\n') {
3393 settings_len = p - settings;
3401 if (p >= q || *p != '\n')
3402 return AVERROR_INVALIDDATA;
3407 while (text_len > 0) {
3408 const int len = text_len - 1;
3409 const uint8_t c = p[len];
3410 if (c != '\r' && c != '\n')
3416 return AVERROR_INVALIDDATA;
3418 err = av_new_packet(pkt, text_len);
3423 memcpy(pkt->data, text, text_len);
3426 buf = av_packet_new_side_data(pkt,
3427 AV_PKT_DATA_WEBVTT_IDENTIFIER,
3430 av_packet_unref(pkt);
3431 return AVERROR(ENOMEM);
3433 memcpy(buf, id, id_len);
3436 if (settings_len > 0) {
3437 buf = av_packet_new_side_data(pkt,
3438 AV_PKT_DATA_WEBVTT_SETTINGS,
3441 av_packet_unref(pkt);
3442 return AVERROR(ENOMEM);
3444 memcpy(buf, settings, settings_len);
3447 // Do we need this for subtitles?
3448 // pkt->flags = AV_PKT_FLAG_KEY;
3450 pkt->stream_index = st->index;
3451 pkt->pts = timecode;
3453 // Do we need this for subtitles?
3454 // pkt->dts = timecode;
3456 pkt->duration = duration;
3459 err = avpriv_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, NULL, 0);
3461 av_packet_unref(pkt);
3462 return AVERROR(ENOMEM);
3468 static int matroska_parse_frame(MatroskaDemuxContext *matroska,
3469 MatroskaTrack *track, AVStream *st,
3470 AVBufferRef *buf, uint8_t *data, int pkt_size,
3471 uint64_t timecode, uint64_t lace_duration,
3472 int64_t pos, int is_keyframe,
3473 uint8_t *additional, uint64_t additional_id, int additional_size,
3474 int64_t discard_padding)
3476 uint8_t *pkt_data = data;
3478 AVPacket pktl, *pkt = &pktl;
3480 if (st->codecpar->codec_id == AV_CODEC_ID_WAVPACK) {
3481 res = matroska_parse_wavpack(track, &pkt_data, &pkt_size);
3483 av_log(matroska->ctx, AV_LOG_ERROR,
3484 "Error parsing a wavpack block.\n");
3492 if (st->codecpar->codec_id == AV_CODEC_ID_PRORES &&
3493 AV_RB32(pkt_data + 4) != MKBETAG('i', 'c', 'p', 'f')) {
3494 res = matroska_parse_prores(track, &pkt_data, &pkt_size);
3496 av_log(matroska->ctx, AV_LOG_ERROR,
3497 "Error parsing a prores block.\n");
3505 if (!pkt_size && !additional_size)
3508 av_init_packet(pkt);
3510 pkt->buf = av_buffer_create(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE,
3513 pkt->buf = av_buffer_ref(buf);
3516 res = AVERROR(ENOMEM);
3520 pkt->data = pkt_data;
3521 pkt->size = pkt_size;
3522 pkt->flags = is_keyframe;
3523 pkt->stream_index = st->index;
3525 if (additional_size > 0) {
3526 uint8_t *side_data = av_packet_new_side_data(pkt,
3527 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
3528 additional_size + 8);
3530 av_packet_unref(pkt);
3531 return AVERROR(ENOMEM);
3533 AV_WB64(side_data, additional_id);
3534 memcpy(side_data + 8, additional, additional_size);
3537 if (discard_padding) {
3538 uint8_t *side_data = av_packet_new_side_data(pkt,
3539 AV_PKT_DATA_SKIP_SAMPLES,
3542 av_packet_unref(pkt);
3543 return AVERROR(ENOMEM);
3545 discard_padding = av_rescale_q(discard_padding,
3546 (AVRational){1, 1000000000},
3547 (AVRational){1, st->codecpar->sample_rate});
3548 if (discard_padding > 0) {
3549 AV_WL32(side_data + 4, discard_padding);
3551 AV_WL32(side_data, -discard_padding);
3555 if (track->ms_compat)
3556 pkt->dts = timecode;
3558 pkt->pts = timecode;
3560 pkt->duration = lace_duration;
3562 #if FF_API_CONVERGENCE_DURATION
3563 FF_DISABLE_DEPRECATION_WARNINGS
3564 if (st->codecpar->codec_id == AV_CODEC_ID_SUBRIP) {
3565 pkt->convergence_duration = lace_duration;
3567 FF_ENABLE_DEPRECATION_WARNINGS
3570 res = avpriv_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, NULL, 0);
3572 av_packet_unref(pkt);
3573 return AVERROR(ENOMEM);
3585 static int matroska_parse_block(MatroskaDemuxContext *matroska, AVBufferRef *buf, uint8_t *data,
3586 int size, int64_t pos, uint64_t cluster_time,
3587 uint64_t block_duration, int is_keyframe,
3588 uint8_t *additional, uint64_t additional_id, int additional_size,
3589 int64_t cluster_pos, int64_t discard_padding)
3591 uint64_t timecode = AV_NOPTS_VALUE;
3592 MatroskaTrack *track;
3597 uint32_t lace_size[256];
3598 int n, flags, laces = 0;
3600 int trust_default_duration;
3602 ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
3604 if ((n = ebml_read_num(matroska, &pb, 8, &num, 1)) < 0)
3609 track = matroska_find_track_by_num(matroska, num);
3610 if (!track || size < 3)
3611 return AVERROR_INVALIDDATA;
3613 if (!(st = track->stream)) {
3614 av_log(matroska->ctx, AV_LOG_VERBOSE,
3615 "No stream associated to TrackNumber %"PRIu64". "
3616 "Ignoring Block with this TrackNumber.\n", num);
3620 if (st->discard >= AVDISCARD_ALL)
3622 if (block_duration > INT64_MAX)
3623 block_duration = INT64_MAX;
3625 block_time = sign_extend(AV_RB16(data), 16);
3629 if (is_keyframe == -1)
3630 is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
3632 if (cluster_time != (uint64_t) -1 &&
3633 (block_time >= 0 || cluster_time >= -block_time)) {
3634 uint64_t timecode_cluster_in_track_tb = (double) cluster_time / track->time_scale;
3635 timecode = timecode_cluster_in_track_tb + block_time - track->codec_delay_in_track_tb;
3636 if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
3637 timecode < track->end_timecode)
3638 is_keyframe = 0; /* overlapping subtitles are not key frame */
3640 ff_reduce_index(matroska->ctx, st->index);
3641 av_add_index_entry(st, cluster_pos, timecode, 0, 0,
3646 if (matroska->skip_to_keyframe &&
3647 track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
3648 // Compare signed timecodes. Timecode may be negative due to codec delay
3649 // offset. We don't support timestamps greater than int64_t anyway - see
3651 if ((int64_t)timecode < (int64_t)matroska->skip_to_timecode)
3654 matroska->skip_to_keyframe = 0;
3655 else if (!st->internal->skip_to_keyframe) {
3656 av_log(matroska->ctx, AV_LOG_ERROR, "File is broken, keyframes not correctly marked!\n");
3657 matroska->skip_to_keyframe = 0;
3661 res = matroska_parse_laces(matroska, &data, size, (flags & 0x06) >> 1,
3662 &pb, lace_size, &laces);
3664 av_log(matroska->ctx, AV_LOG_ERROR, "Error parsing frame sizes.\n");
3668 trust_default_duration = track->default_duration != 0;
3669 if (track->audio.samplerate == 8000 && trust_default_duration) {
3670 // If this is needed for more codecs, then add them here
3671 if (st->codecpar->codec_id == AV_CODEC_ID_AC3) {
3672 if (track->audio.samplerate != st->codecpar->sample_rate || !st->codecpar->frame_size)
3673 trust_default_duration = 0;
3677 if (!block_duration && trust_default_duration)
3678 block_duration = track->default_duration * laces / matroska->time_scale;
3680 if (cluster_time != (uint64_t)-1 && (block_time >= 0 || cluster_time >= -block_time))
3681 track->end_timecode =
3682 FFMAX(track->end_timecode, timecode + block_duration);
3684 for (n = 0; n < laces; n++) {
3685 int64_t lace_duration = block_duration*(n+1) / laces - block_duration*n / laces;
3686 uint8_t *out_data = data;
3687 int out_size = lace_size[n];
3689 if (track->needs_decoding) {
3690 res = matroska_decode_buffer(&out_data, &out_size, track);
3693 /* Given that we are here means that out_data is no longer
3694 * owned by buf, so set it to NULL. This depends upon
3695 * zero-length header removal compression being ignored. */
3696 av_assert1(out_data != data);
3700 if (track->audio.buf) {
3701 res = matroska_parse_rm_audio(matroska, track, st,
3708 } else if (st->codecpar->codec_id == AV_CODEC_ID_WEBVTT) {
3709 res = matroska_parse_webvtt(matroska, track, st,
3711 timecode, lace_duration,
3718 res = matroska_parse_frame(matroska, track, st, buf, out_data,
3719 out_size, timecode, lace_duration,
3720 pos, !n ? is_keyframe : 0,
3721 additional, additional_id, additional_size,
3727 if (timecode != AV_NOPTS_VALUE)
3728 timecode = lace_duration ? timecode + lace_duration : AV_NOPTS_VALUE;
3729 data += lace_size[n];
3735 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
3737 MatroskaCluster *cluster = &matroska->current_cluster;
3738 MatroskaBlock *block = &cluster->block;
3741 av_assert0(matroska->num_levels <= 2);
3743 if (matroska->num_levels == 1) {
3744 res = ebml_parse(matroska, matroska_segment, NULL);
3747 /* Found a cluster: subtract the size of the ID already read. */
3748 cluster->pos = avio_tell(matroska->ctx->pb) - 4;
3750 res = ebml_parse(matroska, matroska_cluster_enter, cluster);
3756 if (matroska->num_levels == 2) {
3757 /* We are inside a cluster. */
3758 res = ebml_parse(matroska, matroska_cluster_parsing, cluster);
3760 if (res >= 0 && block->bin.size > 0) {
3761 int is_keyframe = block->non_simple ? block->reference.count == 0 : -1;
3762 uint8_t* additional = block->additional.size > 0 ?
3763 block->additional.data : NULL;
3765 res = matroska_parse_block(matroska, block->bin.buf, block->bin.data,
3766 block->bin.size, block->bin.pos,
3767 cluster->timecode, block->duration,
3768 is_keyframe, additional, block->additional_id,
3769 block->additional.size, cluster->pos,
3770 block->discard_padding);
3773 ebml_free(matroska_blockgroup, block);
3774 memset(block, 0, sizeof(*block));
3775 } else if (!matroska->num_levels) {
3776 if (!avio_feof(matroska->ctx->pb)) {
3777 avio_r8(matroska->ctx->pb);
3778 if (!avio_feof(matroska->ctx->pb)) {
3779 av_log(matroska->ctx, AV_LOG_WARNING, "File extends beyond "
3780 "end of segment.\n");
3781 return AVERROR_INVALIDDATA;
3791 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
3793 MatroskaDemuxContext *matroska = s->priv_data;
3796 if (matroska->resync_pos == -1) {
3797 // This can only happen if generic seeking has been used.
3798 matroska->resync_pos = avio_tell(s->pb);
3801 while (matroska_deliver_packet(matroska, pkt)) {
3803 return (ret < 0) ? ret : AVERROR_EOF;
3804 if (matroska_parse_cluster(matroska) < 0 && !matroska->done)
3805 ret = matroska_resync(matroska, matroska->resync_pos);
3811 static int matroska_read_seek(AVFormatContext *s, int stream_index,
3812 int64_t timestamp, int flags)
3814 MatroskaDemuxContext *matroska = s->priv_data;
3815 MatroskaTrack *tracks = NULL;
3816 AVStream *st = s->streams[stream_index];
3819 /* Parse the CUES now since we need the index data to seek. */
3820 if (matroska->cues_parsing_deferred > 0) {
3821 matroska->cues_parsing_deferred = 0;
3822 matroska_parse_cues(matroska);
3825 if (!st->internal->nb_index_entries)
3827 timestamp = FFMAX(timestamp, st->internal->index_entries[0].timestamp);
3829 if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->internal->nb_index_entries - 1) {
3830 matroska_reset_status(matroska, 0, st->internal->index_entries[st->internal->nb_index_entries - 1].pos);
3831 while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->internal->nb_index_entries - 1) {
3832 matroska_clear_queue(matroska);
3833 if (matroska_parse_cluster(matroska) < 0)
3838 matroska_clear_queue(matroska);
3839 if (index < 0 || (matroska->cues_parsing_deferred < 0 && index == st->internal->nb_index_entries - 1))
3842 tracks = matroska->tracks.elem;
3843 for (i = 0; i < matroska->tracks.nb_elem; i++) {
3844 tracks[i].audio.pkt_cnt = 0;
3845 tracks[i].audio.sub_packet_cnt = 0;
3846 tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
3847 tracks[i].end_timecode = 0;
3850 /* We seek to a level 1 element, so set the appropriate status. */
3851 matroska_reset_status(matroska, 0, st->internal->index_entries[index].pos);
3852 if (flags & AVSEEK_FLAG_ANY) {
3853 st->internal->skip_to_keyframe = 0;
3854 matroska->skip_to_timecode = timestamp;
3856 st->internal->skip_to_keyframe = 1;
3857 matroska->skip_to_timecode = st->internal->index_entries[index].timestamp;
3859 matroska->skip_to_keyframe = 1;
3861 ff_update_cur_dts(s, st, st->internal->index_entries[index].timestamp);
3864 // slightly hackish but allows proper fallback to
3865 // the generic seeking code.
3866 matroska_reset_status(matroska, 0, -1);
3867 matroska->resync_pos = -1;
3868 matroska_clear_queue(matroska);
3869 st->internal->skip_to_keyframe =
3870 matroska->skip_to_keyframe = 0;
3875 static int matroska_read_close(AVFormatContext *s)
3877 MatroskaDemuxContext *matroska = s->priv_data;
3878 MatroskaTrack *tracks = matroska->tracks.elem;
3881 matroska_clear_queue(matroska);
3883 for (n = 0; n < matroska->tracks.nb_elem; n++)
3884 if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
3885 av_freep(&tracks[n].audio.buf);
3886 ebml_free(matroska_segment, matroska);
3892 int64_t start_time_ns;
3893 int64_t end_time_ns;
3894 int64_t start_offset;
3898 /* This function searches all the Cues and returns the CueDesc corresponding to
3899 * the timestamp ts. Returned CueDesc will be such that start_time_ns <= ts <
3900 * end_time_ns. All 4 fields will be set to -1 if ts >= file's duration.
3902 static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start) {
3903 MatroskaDemuxContext *matroska = s->priv_data;
3906 int nb_index_entries = s->streams[0]->internal->nb_index_entries;
3907 AVIndexEntry *index_entries = s->streams[0]->internal->index_entries;
3908 if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
3909 for (i = 1; i < nb_index_entries; i++) {
3910 if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
3911 index_entries[i].timestamp * matroska->time_scale > ts) {
3916 cue_desc.start_time_ns = index_entries[i].timestamp * matroska->time_scale;
3917 cue_desc.start_offset = index_entries[i].pos - matroska->segment_start;
3918 if (i != nb_index_entries - 1) {
3919 cue_desc.end_time_ns = index_entries[i + 1].timestamp * matroska->time_scale;
3920 cue_desc.end_offset = index_entries[i + 1].pos - matroska->segment_start;
3922 cue_desc.end_time_ns = matroska->duration * matroska->time_scale;
3923 // FIXME: this needs special handling for files where Cues appear
3924 // before Clusters. the current logic assumes Cues appear after
3926 cue_desc.end_offset = cues_start - matroska->segment_start;
3931 static int webm_clusters_start_with_keyframe(AVFormatContext *s)
3933 MatroskaDemuxContext *matroska = s->priv_data;
3934 uint32_t id = matroska->current_id;
3935 int64_t cluster_pos, before_pos;
3937 if (s->streams[0]->internal->nb_index_entries <= 0) return 0;
3938 // seek to the first cluster using cues.
3939 index = av_index_search_timestamp(s->streams[0], 0, 0);
3940 if (index < 0) return 0;
3941 cluster_pos = s->streams[0]->internal->index_entries[index].pos;
3942 before_pos = avio_tell(s->pb);
3944 uint64_t cluster_id, cluster_length;
3947 avio_seek(s->pb, cluster_pos, SEEK_SET);
3948 // read cluster id and length
3949 read = ebml_read_num(matroska, matroska->ctx->pb, 4, &cluster_id, 1);
3950 if (read < 0 || cluster_id != 0xF43B675) // done with all clusters
3952 read = ebml_read_length(matroska, matroska->ctx->pb, &cluster_length);
3956 matroska_reset_status(matroska, 0, cluster_pos);
3957 matroska_clear_queue(matroska);
3958 if (matroska_parse_cluster(matroska) < 0 ||
3962 pkt = &matroska->queue->pkt;
3963 // 4 + read is the length of the cluster id and the cluster length field.
3964 cluster_pos += 4 + read + cluster_length;
3965 if (!(pkt->flags & AV_PKT_FLAG_KEY)) {
3971 /* Restore the status after matroska_read_header: */
3972 matroska_reset_status(matroska, id, before_pos);
3977 static int buffer_size_after_time_downloaded(int64_t time_ns, double search_sec, int64_t bps,
3978 double min_buffer, double* buffer,
3979 double* sec_to_download, AVFormatContext *s,
3982 double nano_seconds_per_second = 1000000000.0;
3983 double time_sec = time_ns / nano_seconds_per_second;
3985 int64_t time_to_search_ns = (int64_t)(search_sec * nano_seconds_per_second);
3986 int64_t end_time_ns = time_ns + time_to_search_ns;
3987 double sec_downloaded = 0.0;
3988 CueDesc desc_curr = get_cue_desc(s, time_ns, cues_start);
3989 if (desc_curr.start_time_ns == -1)
3991 *sec_to_download = 0.0;
3993 // Check for non cue start time.
3994 if (time_ns > desc_curr.start_time_ns) {
3995 int64_t cue_nano = desc_curr.end_time_ns - time_ns;
3996 double percent = (double)(cue_nano) / (desc_curr.end_time_ns - desc_curr.start_time_ns);
3997 double cueBytes = (desc_curr.end_offset - desc_curr.start_offset) * percent;
3998 double timeToDownload = (cueBytes * 8.0) / bps;
4000 sec_downloaded += (cue_nano / nano_seconds_per_second) - timeToDownload;
4001 *sec_to_download += timeToDownload;
4003 // Check if the search ends within the first cue.
4004 if (desc_curr.end_time_ns >= end_time_ns) {
4005 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
4006 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
4007 sec_downloaded = percent_to_sub * sec_downloaded;
4008 *sec_to_download = percent_to_sub * *sec_to_download;
4011 if ((sec_downloaded + *buffer) <= min_buffer) {
4015 // Get the next Cue.
4016 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
4019 while (desc_curr.start_time_ns != -1) {
4020 int64_t desc_bytes = desc_curr.end_offset - desc_curr.start_offset;
4021 int64_t desc_ns = desc_curr.end_time_ns - desc_curr.start_time_ns;
4022 double desc_sec = desc_ns / nano_seconds_per_second;
4023 double bits = (desc_bytes * 8.0);
4024 double time_to_download = bits / bps;
4026 sec_downloaded += desc_sec - time_to_download;
4027 *sec_to_download += time_to_download;
4029 if (desc_curr.end_time_ns >= end_time_ns) {
4030 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
4031 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
4032 sec_downloaded = percent_to_sub * sec_downloaded;
4033 *sec_to_download = percent_to_sub * *sec_to_download;
4035 if ((sec_downloaded + *buffer) <= min_buffer)
4040 if ((sec_downloaded + *buffer) <= min_buffer) {
4045 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
4047 *buffer = *buffer + sec_downloaded;
4051 /* This function computes the bandwidth of the WebM file with the help of
4052 * buffer_size_after_time_downloaded() function. Both of these functions are
4053 * adapted from WebM Tools project and are adapted to work with FFmpeg's
4054 * Matroska parsing mechanism.
4056 * Returns the bandwidth of the file on success; -1 on error.
4058 static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t cues_start)
4060 MatroskaDemuxContext *matroska = s->priv_data;
4061 AVStream *st = s->streams[0];
4062 double bandwidth = 0.0;
4065 for (i = 0; i < st->internal->nb_index_entries; i++) {
4066 int64_t prebuffer_ns = 1000000000;
4067 int64_t time_ns = st->internal->index_entries[i].timestamp * matroska->time_scale;
4068 double nano_seconds_per_second = 1000000000.0;
4069 int64_t prebuffered_ns = time_ns + prebuffer_ns;
4070 double prebuffer_bytes = 0.0;
4071 int64_t temp_prebuffer_ns = prebuffer_ns;
4072 int64_t pre_bytes, pre_ns;
4073 double pre_sec, prebuffer, bits_per_second;
4074 CueDesc desc_beg = get_cue_desc(s, time_ns, cues_start);
4076 // Start with the first Cue.
4077 CueDesc desc_end = desc_beg;
4079 // Figure out how much data we have downloaded for the prebuffer. This will
4080 // be used later to adjust the bits per sample to try.
4081 while (desc_end.start_time_ns != -1 && desc_end.end_time_ns < prebuffered_ns) {
4082 // Prebuffered the entire Cue.
4083 prebuffer_bytes += desc_end.end_offset - desc_end.start_offset;
4084 temp_prebuffer_ns -= desc_end.end_time_ns - desc_end.start_time_ns;
4085 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
4087 if (desc_end.start_time_ns == -1) {
4088 // The prebuffer is larger than the duration.
4089 if (matroska->duration * matroska->time_scale >= prebuffered_ns)
4091 bits_per_second = 0.0;
4093 // The prebuffer ends in the last Cue. Estimate how much data was
4095 pre_bytes = desc_end.end_offset - desc_end.start_offset;
4096 pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
4097 pre_sec = pre_ns / nano_seconds_per_second;
4099 pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec);
4101 prebuffer = prebuffer_ns / nano_seconds_per_second;
4103 // Set this to 0.0 in case our prebuffer buffers the entire video.
4104 bits_per_second = 0.0;
4106 int64_t desc_bytes = desc_end.end_offset - desc_beg.start_offset;
4107 int64_t desc_ns = desc_end.end_time_ns - desc_beg.start_time_ns;
4108 double desc_sec = desc_ns / nano_seconds_per_second;
4109 double calc_bits_per_second = (desc_bytes * 8) / desc_sec;
4111 // Drop the bps by the percentage of bytes buffered.
4112 double percent = (desc_bytes - prebuffer_bytes) / desc_bytes;
4113 double mod_bits_per_second = calc_bits_per_second * percent;
4115 if (prebuffer < desc_sec) {
4117 (double)(matroska->duration * matroska->time_scale) / nano_seconds_per_second;
4119 // Add 1 so the bits per second should be a little bit greater than file
4121 int64_t bps = (int64_t)(mod_bits_per_second) + 1;
4122 const double min_buffer = 0.0;
4123 double buffer = prebuffer;
4124 double sec_to_download = 0.0;
4126 int rv = buffer_size_after_time_downloaded(prebuffered_ns, search_sec, bps,
4127 min_buffer, &buffer, &sec_to_download,
4131 } else if (rv == 0) {
4132 bits_per_second = (double)(bps);
4137 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
4138 } while (desc_end.start_time_ns != -1);
4140 if (bandwidth < bits_per_second) bandwidth = bits_per_second;
4142 return (int64_t)bandwidth;
4145 static int webm_dash_manifest_cues(AVFormatContext *s, int64_t init_range)
4147 MatroskaDemuxContext *matroska = s->priv_data;
4148 EbmlList *seekhead_list = &matroska->seekhead;
4149 MatroskaSeekhead *seekhead = seekhead_list->elem;
4151 int64_t cues_start = -1, cues_end = -1, before_pos, bandwidth;
4155 // determine cues start and end positions
4156 for (i = 0; i < seekhead_list->nb_elem; i++)
4157 if (seekhead[i].id == MATROSKA_ID_CUES)
4160 if (i >= seekhead_list->nb_elem) return -1;
4162 before_pos = avio_tell(matroska->ctx->pb);
4163 cues_start = seekhead[i].pos + matroska->segment_start;
4164 if (avio_seek(matroska->ctx->pb, cues_start, SEEK_SET) == cues_start) {
4165 // cues_end is computed as cues_start + cues_length + length of the
4166 // Cues element ID (i.e. 4) + EBML length of the Cues element.
4167 // cues_end is inclusive and the above sum is reduced by 1.
4168 uint64_t cues_length, cues_id;
4170 bytes_read = ebml_read_num (matroska, matroska->ctx->pb, 4, &cues_id, 1);
4171 if (bytes_read < 0 || cues_id != (MATROSKA_ID_CUES & 0xfffffff))
4172 return bytes_read < 0 ? bytes_read : AVERROR_INVALIDDATA;
4173 bytes_read = ebml_read_length(matroska, matroska->ctx->pb, &cues_length);
4176 cues_end = cues_start + 4 + bytes_read + cues_length - 1;
4178 avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
4179 if (cues_start == -1 || cues_end == -1) return -1;
4182 matroska_parse_cues(matroska);
4185 av_dict_set_int(&s->streams[0]->metadata, CUES_START, cues_start, 0);
4188 av_dict_set_int(&s->streams[0]->metadata, CUES_END, cues_end, 0);
4190 // if the file has cues at the start, fix up the init range so that
4191 // it does not include it
4192 if (cues_start <= init_range)
4193 av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, cues_start - 1, 0);
4196 bandwidth = webm_dash_manifest_compute_bandwidth(s, cues_start);
4197 if (bandwidth < 0) return -1;
4198 av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH, bandwidth, 0);
4200 // check if all clusters start with key frames
4201 av_dict_set_int(&s->streams[0]->metadata, CLUSTER_KEYFRAME, webm_clusters_start_with_keyframe(s), 0);
4203 // store cue point timestamps as a comma separated list for checking subsegment alignment in
4204 // the muxer. assumes that each timestamp cannot be more than 20 characters long.
4205 buf = av_malloc_array(s->streams[0]->internal->nb_index_entries, 20);
4206 if (!buf) return -1;
4208 for (i = 0; i < s->streams[0]->internal->nb_index_entries; i++) {
4209 int ret = snprintf(buf + end, 20,
4210 "%" PRId64"%s", s->streams[0]->internal->index_entries[i].timestamp,
4211 i != s->streams[0]->internal->nb_index_entries - 1 ? "," : "");
4212 if (ret <= 0 || (ret == 20 && i == s->streams[0]->internal->nb_index_entries - 1)) {
4213 av_log(s, AV_LOG_ERROR, "timestamp too long.\n");
4215 return AVERROR_INVALIDDATA;
4219 av_dict_set(&s->streams[0]->metadata, CUE_TIMESTAMPS,
4220 buf, AV_DICT_DONT_STRDUP_VAL);
4225 static int webm_dash_manifest_read_header(AVFormatContext *s)
4228 int ret = matroska_read_header(s);
4230 MatroskaTrack *tracks;
4231 MatroskaDemuxContext *matroska = s->priv_data;
4233 av_log(s, AV_LOG_ERROR, "Failed to read file headers\n");
4236 if (!matroska->tracks.nb_elem || !s->nb_streams) {
4237 av_log(s, AV_LOG_ERROR, "No track found\n");
4238 ret = AVERROR_INVALIDDATA;
4242 if (!matroska->is_live) {
4243 buf = av_asprintf("%g", matroska->duration);
4245 ret = AVERROR(ENOMEM);
4248 av_dict_set(&s->streams[0]->metadata, DURATION,
4249 buf, AV_DICT_DONT_STRDUP_VAL);
4251 // initialization range
4252 // 5 is the offset of Cluster ID.
4253 init_range = avio_tell(s->pb) - 5;
4254 av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, init_range, 0);
4257 // basename of the file
4258 buf = strrchr(s->url, '/');
4259 av_dict_set(&s->streams[0]->metadata, FILENAME, buf ? ++buf : s->url, 0);
4262 tracks = matroska->tracks.elem;
4263 av_dict_set_int(&s->streams[0]->metadata, TRACK_NUMBER, tracks[0].num, 0);
4265 // parse the cues and populate Cue related fields
4266 if (!matroska->is_live) {
4267 ret = webm_dash_manifest_cues(s, init_range);
4269 av_log(s, AV_LOG_ERROR, "Error parsing Cues\n");
4274 // use the bandwidth from the command line if it was provided
4275 if (matroska->bandwidth > 0) {
4276 av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH,
4277 matroska->bandwidth, 0);
4281 matroska_read_close(s);
4285 static int webm_dash_manifest_read_packet(AVFormatContext *s, AVPacket *pkt)
4290 #define OFFSET(x) offsetof(MatroskaDemuxContext, x)
4291 static const AVOption options[] = {
4292 { "live", "flag indicating that the input is a live file that only has the headers.", OFFSET(is_live), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
4293 { "bandwidth", "bandwidth of this stream to be specified in the DASH manifest.", OFFSET(bandwidth), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
4297 static const AVClass webm_dash_class = {
4298 .class_name = "WebM DASH Manifest demuxer",
4299 .item_name = av_default_item_name,
4301 .version = LIBAVUTIL_VERSION_INT,
4304 AVInputFormat ff_matroska_demuxer = {
4305 .name = "matroska,webm",
4306 .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
4307 .extensions = "mkv,mk3d,mka,mks",
4308 .priv_data_size = sizeof(MatroskaDemuxContext),
4309 .read_probe = matroska_probe,
4310 .read_header = matroska_read_header,
4311 .read_packet = matroska_read_packet,
4312 .read_close = matroska_read_close,
4313 .read_seek = matroska_read_seek,
4314 .mime_type = "audio/webm,audio/x-matroska,video/webm,video/x-matroska"
4317 AVInputFormat ff_webm_dash_manifest_demuxer = {
4318 .name = "webm_dash_manifest",
4319 .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
4320 .priv_data_size = sizeof(MatroskaDemuxContext),
4321 .read_header = webm_dash_manifest_read_header,
4322 .read_packet = webm_dash_manifest_read_packet,
4323 .read_close = matroska_read_close,
4324 .priv_class = &webm_dash_class,