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"
53 #include "avio_internal.h"
58 /* For ff_codec_get_id(). */
69 #include "qtpalette.h"
71 #define EBML_UNKNOWN_LENGTH UINT64_MAX /* EBML unknown length, in uint64_t */
72 #define NEEDS_CHECKING 2 /* Indicates that some error checks
73 * still need to be performed */
74 #define LEVEL_ENDED 3 /* return value of ebml_parse when the
75 * syntax level used for parsing ended. */
76 #define SKIP_THRESHOLD 1024 * 1024 /* In non-seekable mode, if more than SKIP_THRESHOLD
77 * of unkown, potentially damaged data is encountered,
78 * it is considered an error. */
79 #define UNKNOWN_EQUIV 50 * 1024 /* An unknown element is considered equivalent
80 * to this many bytes of unknown data for the
81 * SKIP_THRESHOLD check. */
97 typedef const struct EbmlSyntax {
100 size_t list_elem_size;
107 const struct EbmlSyntax *n;
111 typedef struct EbmlList {
113 unsigned int alloc_elem_size;
117 typedef struct EbmlBin {
124 typedef struct Ebml {
129 uint64_t doctype_version;
132 typedef struct MatroskaTrackCompression {
135 } MatroskaTrackCompression;
137 typedef struct MatroskaTrackEncryption {
140 } MatroskaTrackEncryption;
142 typedef struct MatroskaTrackEncoding {
145 MatroskaTrackCompression compression;
146 MatroskaTrackEncryption encryption;
147 } MatroskaTrackEncoding;
149 typedef struct MatroskaMasteringMeta {
158 double max_luminance;
159 double min_luminance;
160 } MatroskaMasteringMeta;
162 typedef struct MatroskaTrackVideoColor {
163 uint64_t matrix_coefficients;
164 uint64_t bits_per_channel;
165 uint64_t chroma_sub_horz;
166 uint64_t chroma_sub_vert;
167 uint64_t cb_sub_horz;
168 uint64_t cb_sub_vert;
169 uint64_t chroma_siting_horz;
170 uint64_t chroma_siting_vert;
172 uint64_t transfer_characteristics;
176 MatroskaMasteringMeta mastering_meta;
177 } MatroskaTrackVideoColor;
179 typedef struct MatroskaTrackVideoProjection {
185 } MatroskaTrackVideoProjection;
187 typedef struct MatroskaTrackVideo {
189 uint64_t display_width;
190 uint64_t display_height;
191 uint64_t pixel_width;
192 uint64_t pixel_height;
194 uint64_t display_unit;
196 uint64_t field_order;
197 uint64_t stereo_mode;
200 MatroskaTrackVideoProjection projection;
201 } MatroskaTrackVideo;
203 typedef struct MatroskaTrackAudio {
205 double out_samplerate;
209 /* real audio header (extracted from extradata) */
216 uint64_t buf_timecode;
218 } MatroskaTrackAudio;
220 typedef struct MatroskaTrackPlane {
223 } MatroskaTrackPlane;
225 typedef struct MatroskaTrackOperation {
226 EbmlList combine_planes;
227 } MatroskaTrackOperation;
229 typedef struct MatroskaTrack {
238 uint64_t default_duration;
239 uint64_t flag_default;
240 uint64_t flag_forced;
241 uint64_t seek_preroll;
242 MatroskaTrackVideo video;
243 MatroskaTrackAudio audio;
244 MatroskaTrackOperation operation;
246 uint64_t codec_delay;
247 uint64_t codec_delay_in_track_tb;
250 int64_t end_timecode;
252 uint64_t max_block_additional_id;
254 uint32_t palette[AVPALETTE_COUNT];
258 typedef struct MatroskaAttachment {
265 } MatroskaAttachment;
267 typedef struct MatroskaChapter {
276 typedef struct MatroskaIndexPos {
281 typedef struct MatroskaIndex {
286 typedef struct MatroskaTag {
294 typedef struct MatroskaTagTarget {
302 typedef struct MatroskaTags {
303 MatroskaTagTarget target;
307 typedef struct MatroskaSeekhead {
312 typedef struct MatroskaLevel {
317 typedef struct MatroskaBlock {
322 uint64_t additional_id;
324 int64_t discard_padding;
327 typedef struct MatroskaCluster {
333 typedef struct MatroskaLevel1Element {
337 } MatroskaLevel1Element;
339 typedef struct MatroskaDemuxContext {
340 const AVClass *class;
341 AVFormatContext *ctx;
344 MatroskaLevel levels[EBML_MAX_DEPTH];
356 EbmlList attachments;
362 /* byte position of the segment inside the stream */
363 int64_t segment_start;
365 /* the packet queue */
367 AVPacketList *queue_end;
371 /* What to skip before effectively reading a packet. */
372 int skip_to_keyframe;
373 uint64_t skip_to_timecode;
375 /* File has a CUES element, but we defer parsing until it is needed. */
376 int cues_parsing_deferred;
378 /* Level1 elements and whether they were read yet */
379 MatroskaLevel1Element level1_elems[64];
380 int num_level1_elems;
382 MatroskaCluster current_cluster;
384 /* WebM DASH Manifest live flag */
387 /* Bandwidth value for WebM DASH Manifest */
389 } MatroskaDemuxContext;
391 #define CHILD_OF(parent) { .def = { .n = parent } }
393 // The following forward declarations need their size because
394 // a tentative definition with internal linkage must not be an
395 // incomplete type (6.7.2 in C90, 6.9.2 in C99).
396 // Removing the sizes breaks MSVC.
397 static EbmlSyntax ebml_syntax[3], matroska_segment[9], matroska_track_video_color[15], matroska_track_video[19],
398 matroska_track[27], matroska_track_encoding[6], matroska_track_encodings[2],
399 matroska_track_combine_planes[2], matroska_track_operation[2], matroska_tracks[2],
400 matroska_attachments[2], matroska_chapter_entry[9], matroska_chapter[6], matroska_chapters[2],
401 matroska_index_entry[3], matroska_index[2], matroska_tag[3], matroska_tags[2], matroska_seekhead[2],
402 matroska_blockadditions[2], matroska_blockgroup[8], matroska_cluster_parsing[8];
404 static EbmlSyntax ebml_header[] = {
405 { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml, version), { .u = EBML_VERSION } },
406 { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml, max_size), { .u = 8 } },
407 { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml, id_length), { .u = 4 } },
408 { EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml, doctype), { .s = "(none)" } },
409 { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml, doctype_version), { .u = 1 } },
410 { EBML_ID_EBMLVERSION, EBML_NONE },
411 { EBML_ID_DOCTYPEVERSION, EBML_NONE },
412 CHILD_OF(ebml_syntax)
415 static EbmlSyntax ebml_syntax[] = {
416 { EBML_ID_HEADER, EBML_NEST, 0, 0, { .n = ebml_header } },
417 { MATROSKA_ID_SEGMENT, EBML_STOP },
421 static EbmlSyntax matroska_info[] = {
422 { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } },
423 { MATROSKA_ID_DURATION, EBML_FLOAT, 0, offsetof(MatroskaDemuxContext, duration) },
424 { MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, title) },
425 { MATROSKA_ID_WRITINGAPP, EBML_NONE },
426 { MATROSKA_ID_MUXINGAPP, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, muxingapp) },
427 { MATROSKA_ID_DATEUTC, EBML_BIN, 0, offsetof(MatroskaDemuxContext, date_utc) },
428 { MATROSKA_ID_SEGMENTUID, EBML_NONE },
429 CHILD_OF(matroska_segment)
432 static EbmlSyntax matroska_mastering_meta[] = {
433 { MATROSKA_ID_VIDEOCOLOR_RX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, r_x), { .f=-1 } },
434 { MATROSKA_ID_VIDEOCOLOR_RY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, r_y), { .f=-1 } },
435 { MATROSKA_ID_VIDEOCOLOR_GX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, g_x), { .f=-1 } },
436 { MATROSKA_ID_VIDEOCOLOR_GY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, g_y), { .f=-1 } },
437 { MATROSKA_ID_VIDEOCOLOR_BX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, b_x), { .f=-1 } },
438 { MATROSKA_ID_VIDEOCOLOR_BY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, b_y), { .f=-1 } },
439 { MATROSKA_ID_VIDEOCOLOR_WHITEX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, white_x), { .f=-1 } },
440 { MATROSKA_ID_VIDEOCOLOR_WHITEY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, white_y), { .f=-1 } },
441 { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, min_luminance), { .f=-1 } },
442 { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, max_luminance), { .f=-1 } },
443 CHILD_OF(matroska_track_video_color)
446 static EbmlSyntax matroska_track_video_color[] = {
447 { MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, matrix_coefficients), { .u = AVCOL_SPC_UNSPECIFIED } },
448 { MATROSKA_ID_VIDEOCOLORBITSPERCHANNEL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, bits_per_channel), { .u=0 } },
449 { MATROSKA_ID_VIDEOCOLORCHROMASUBHORZ, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_horz), { .u=0 } },
450 { MATROSKA_ID_VIDEOCOLORCHROMASUBVERT, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_vert), { .u=0 } },
451 { MATROSKA_ID_VIDEOCOLORCBSUBHORZ, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, cb_sub_horz), { .u=0 } },
452 { MATROSKA_ID_VIDEOCOLORCBSUBVERT, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, cb_sub_vert), { .u=0 } },
453 { MATROSKA_ID_VIDEOCOLORCHROMASITINGHORZ, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_siting_horz), { .u = MATROSKA_COLOUR_CHROMASITINGHORZ_UNDETERMINED } },
454 { MATROSKA_ID_VIDEOCOLORCHROMASITINGVERT, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_siting_vert), { .u = MATROSKA_COLOUR_CHROMASITINGVERT_UNDETERMINED } },
455 { MATROSKA_ID_VIDEOCOLORRANGE, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, range), { .u = AVCOL_RANGE_UNSPECIFIED } },
456 { MATROSKA_ID_VIDEOCOLORTRANSFERCHARACTERISTICS, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, transfer_characteristics), { .u = AVCOL_TRC_UNSPECIFIED } },
457 { MATROSKA_ID_VIDEOCOLORPRIMARIES, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, primaries), { .u = AVCOL_PRI_UNSPECIFIED } },
458 { MATROSKA_ID_VIDEOCOLORMAXCLL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, max_cll), { .u=0 } },
459 { MATROSKA_ID_VIDEOCOLORMAXFALL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, max_fall), { .u=0 } },
460 { MATROSKA_ID_VIDEOCOLORMASTERINGMETA, EBML_NEST, 0, offsetof(MatroskaTrackVideoColor, mastering_meta), { .n = matroska_mastering_meta } },
461 CHILD_OF(matroska_track_video)
464 static EbmlSyntax matroska_track_video_projection[] = {
465 { MATROSKA_ID_VIDEOPROJECTIONTYPE, EBML_UINT, 0, offsetof(MatroskaTrackVideoProjection, type), { .u = MATROSKA_VIDEO_PROJECTION_TYPE_RECTANGULAR } },
466 { MATROSKA_ID_VIDEOPROJECTIONPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrackVideoProjection, private) },
467 { MATROSKA_ID_VIDEOPROJECTIONPOSEYAW, EBML_FLOAT, 0, offsetof(MatroskaTrackVideoProjection, yaw), { .f=0.0 } },
468 { MATROSKA_ID_VIDEOPROJECTIONPOSEPITCH, EBML_FLOAT, 0, offsetof(MatroskaTrackVideoProjection, pitch), { .f=0.0 } },
469 { MATROSKA_ID_VIDEOPROJECTIONPOSEROLL, EBML_FLOAT, 0, offsetof(MatroskaTrackVideoProjection, roll), { .f=0.0 } },
470 CHILD_OF(matroska_track_video)
473 static EbmlSyntax matroska_track_video[] = {
474 { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT, 0, offsetof(MatroskaTrackVideo, frame_rate) },
475 { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_width), { .u=-1 } },
476 { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_height), { .u=-1 } },
477 { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_width) },
478 { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_height) },
479 { MATROSKA_ID_VIDEOCOLORSPACE, EBML_BIN, 0, offsetof(MatroskaTrackVideo, color_space) },
480 { MATROSKA_ID_VIDEOALPHAMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, alpha_mode) },
481 { MATROSKA_ID_VIDEOCOLOR, EBML_NEST, sizeof(MatroskaTrackVideoColor), offsetof(MatroskaTrackVideo, color), { .n = matroska_track_video_color } },
482 { MATROSKA_ID_VIDEOPROJECTION, EBML_NEST, 0, offsetof(MatroskaTrackVideo, projection), { .n = matroska_track_video_projection } },
483 { MATROSKA_ID_VIDEOPIXELCROPB, EBML_NONE },
484 { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
485 { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
486 { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
487 { MATROSKA_ID_VIDEODISPLAYUNIT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_unit), { .u= MATROSKA_VIDEO_DISPLAYUNIT_PIXELS } },
488 { MATROSKA_ID_VIDEOFLAGINTERLACED, EBML_UINT, 0, offsetof(MatroskaTrackVideo, interlaced), { .u = MATROSKA_VIDEO_INTERLACE_FLAG_UNDETERMINED } },
489 { MATROSKA_ID_VIDEOFIELDORDER, EBML_UINT, 0, offsetof(MatroskaTrackVideo, field_order), { .u = MATROSKA_VIDEO_FIELDORDER_UNDETERMINED } },
490 { MATROSKA_ID_VIDEOSTEREOMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, stereo_mode), { .u = MATROSKA_VIDEO_STEREOMODE_TYPE_NB } },
491 { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
492 CHILD_OF(matroska_track)
495 static EbmlSyntax matroska_track_audio[] = {
496 { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } },
497 { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, out_samplerate) },
498 { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio, bitdepth) },
499 { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio, channels), { .u = 1 } },
500 CHILD_OF(matroska_track)
503 static EbmlSyntax matroska_track_encoding_compression[] = {
504 { MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, offsetof(MatroskaTrackCompression, algo), { .u = 0 } },
505 { MATROSKA_ID_ENCODINGCOMPSETTINGS, EBML_BIN, 0, offsetof(MatroskaTrackCompression, settings) },
506 CHILD_OF(matroska_track_encoding)
509 static EbmlSyntax matroska_track_encoding_encryption[] = {
510 { MATROSKA_ID_ENCODINGENCALGO, EBML_UINT, 0, offsetof(MatroskaTrackEncryption,algo), {.u = 0} },
511 { MATROSKA_ID_ENCODINGENCKEYID, EBML_BIN, 0, offsetof(MatroskaTrackEncryption,key_id) },
512 { MATROSKA_ID_ENCODINGENCAESSETTINGS, EBML_NONE },
513 { MATROSKA_ID_ENCODINGSIGALGO, EBML_NONE },
514 { MATROSKA_ID_ENCODINGSIGHASHALGO, EBML_NONE },
515 { MATROSKA_ID_ENCODINGSIGKEYID, EBML_NONE },
516 { MATROSKA_ID_ENCODINGSIGNATURE, EBML_NONE },
517 CHILD_OF(matroska_track_encoding)
519 static EbmlSyntax matroska_track_encoding[] = {
520 { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, scope), { .u = 1 } },
521 { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, type), { .u = 0 } },
522 { MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } },
523 { MATROSKA_ID_ENCODINGENCRYPTION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, encryption), { .n = matroska_track_encoding_encryption } },
524 { MATROSKA_ID_ENCODINGORDER, EBML_NONE },
525 CHILD_OF(matroska_track_encodings)
528 static EbmlSyntax matroska_track_encodings[] = {
529 { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } },
530 CHILD_OF(matroska_track)
533 static EbmlSyntax matroska_track_plane[] = {
534 { MATROSKA_ID_TRACKPLANEUID, EBML_UINT, 0, offsetof(MatroskaTrackPlane,uid) },
535 { MATROSKA_ID_TRACKPLANETYPE, EBML_UINT, 0, offsetof(MatroskaTrackPlane,type) },
536 CHILD_OF(matroska_track_combine_planes)
539 static EbmlSyntax matroska_track_combine_planes[] = {
540 { MATROSKA_ID_TRACKPLANE, EBML_NEST, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n = matroska_track_plane} },
541 CHILD_OF(matroska_track_operation)
544 static EbmlSyntax matroska_track_operation[] = {
545 { MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, {.n = matroska_track_combine_planes} },
546 CHILD_OF(matroska_track)
549 static EbmlSyntax matroska_track[] = {
550 { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack, num) },
551 { MATROSKA_ID_TRACKNAME, EBML_UTF8, 0, offsetof(MatroskaTrack, name) },
552 { MATROSKA_ID_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTrack, uid) },
553 { MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, offsetof(MatroskaTrack, type) },
554 { MATROSKA_ID_CODECID, EBML_STR, 0, offsetof(MatroskaTrack, codec_id) },
555 { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack, codec_priv) },
556 { MATROSKA_ID_CODECDELAY, EBML_UINT, 0, offsetof(MatroskaTrack, codec_delay) },
557 { MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack, language), { .s = "eng" } },
558 { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack, default_duration) },
559 { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } },
560 { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack, flag_default), { .u = 1 } },
561 { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } },
562 { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } },
563 { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } },
564 { MATROSKA_ID_TRACKOPERATION, EBML_NEST, 0, offsetof(MatroskaTrack, operation), { .n = matroska_track_operation } },
565 { MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST, 0, 0, { .n = matroska_track_encodings } },
566 { MATROSKA_ID_TRACKMAXBLKADDID, EBML_UINT, 0, offsetof(MatroskaTrack, max_block_additional_id) },
567 { MATROSKA_ID_SEEKPREROLL, EBML_UINT, 0, offsetof(MatroskaTrack, seek_preroll) },
568 { MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE },
569 { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
570 { MATROSKA_ID_CODECNAME, EBML_NONE },
571 { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
572 { MATROSKA_ID_CODECINFOURL, EBML_NONE },
573 { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
574 { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
575 { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
576 CHILD_OF(matroska_tracks)
579 static EbmlSyntax matroska_tracks[] = {
580 { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } },
581 CHILD_OF(matroska_segment)
584 static EbmlSyntax matroska_attachment[] = {
585 { MATROSKA_ID_FILEUID, EBML_UINT, 0, offsetof(MatroskaAttachment, uid) },
586 { MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachment, filename) },
587 { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachment, mime) },
588 { MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachment, bin) },
589 { MATROSKA_ID_FILEDESC, EBML_NONE },
590 CHILD_OF(matroska_attachments)
593 static EbmlSyntax matroska_attachments[] = {
594 { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } },
595 CHILD_OF(matroska_segment)
598 static EbmlSyntax matroska_chapter_display[] = {
599 { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter, title) },
600 { MATROSKA_ID_CHAPLANG, EBML_NONE },
601 { MATROSKA_ID_CHAPCOUNTRY, EBML_NONE },
602 CHILD_OF(matroska_chapter_entry)
605 static EbmlSyntax matroska_chapter_entry[] = {
606 { MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, offsetof(MatroskaChapter, start), { .u = AV_NOPTS_VALUE } },
607 { MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, offsetof(MatroskaChapter, end), { .u = AV_NOPTS_VALUE } },
608 { MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaChapter, uid) },
609 { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, { .n = matroska_chapter_display } },
610 { MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
611 { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
612 { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
613 { MATROSKA_ID_CHAPTERATOM, EBML_NONE },
614 CHILD_OF(matroska_chapter)
617 static EbmlSyntax matroska_chapter[] = {
618 { MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } },
619 { MATROSKA_ID_EDITIONUID, EBML_NONE },
620 { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
621 { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
622 { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
623 CHILD_OF(matroska_chapters)
626 static EbmlSyntax matroska_chapters[] = {
627 { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, { .n = matroska_chapter } },
628 CHILD_OF(matroska_segment)
631 static EbmlSyntax matroska_index_pos[] = {
632 { MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos, track) },
633 { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos, pos) },
634 { MATROSKA_ID_CUERELATIVEPOSITION,EBML_NONE },
635 { MATROSKA_ID_CUEDURATION, EBML_NONE },
636 { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
637 CHILD_OF(matroska_index_entry)
640 static EbmlSyntax matroska_index_entry[] = {
641 { MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex, time) },
642 { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } },
643 CHILD_OF(matroska_index)
646 static EbmlSyntax matroska_index[] = {
647 { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } },
648 CHILD_OF(matroska_segment)
651 static EbmlSyntax matroska_simpletag[] = {
652 { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag, name) },
653 { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag, string) },
654 { MATROSKA_ID_TAGLANG, EBML_STR, 0, offsetof(MatroskaTag, lang), { .s = "und" } },
655 { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTag, def) },
656 { MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0, offsetof(MatroskaTag, def) },
657 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag, sub), { .n = matroska_simpletag } },
658 CHILD_OF(matroska_tag)
661 static EbmlSyntax matroska_tagtargets[] = {
662 { MATROSKA_ID_TAGTARGETS_TYPE, EBML_STR, 0, offsetof(MatroskaTagTarget, type) },
663 { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } },
664 { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, trackuid) },
665 { MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, chapteruid) },
666 { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, attachuid) },
667 CHILD_OF(matroska_tag)
670 static EbmlSyntax matroska_tag[] = {
671 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags, tag), { .n = matroska_simpletag } },
672 { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, offsetof(MatroskaTags, target), { .n = matroska_tagtargets } },
673 CHILD_OF(matroska_tags)
676 static EbmlSyntax matroska_tags[] = {
677 { MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } },
678 CHILD_OF(matroska_segment)
681 static EbmlSyntax matroska_seekhead_entry[] = {
682 { MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead, id) },
683 { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } },
684 CHILD_OF(matroska_seekhead)
687 static EbmlSyntax matroska_seekhead[] = {
688 { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } },
689 CHILD_OF(matroska_segment)
692 static EbmlSyntax matroska_segment[] = {
693 { MATROSKA_ID_CLUSTER, EBML_STOP },
694 { MATROSKA_ID_INFO, EBML_LEVEL1, 0, 0, { .n = matroska_info } },
695 { MATROSKA_ID_TRACKS, EBML_LEVEL1, 0, 0, { .n = matroska_tracks } },
696 { MATROSKA_ID_ATTACHMENTS, EBML_LEVEL1, 0, 0, { .n = matroska_attachments } },
697 { MATROSKA_ID_CHAPTERS, EBML_LEVEL1, 0, 0, { .n = matroska_chapters } },
698 { MATROSKA_ID_CUES, EBML_LEVEL1, 0, 0, { .n = matroska_index } },
699 { MATROSKA_ID_TAGS, EBML_LEVEL1, 0, 0, { .n = matroska_tags } },
700 { MATROSKA_ID_SEEKHEAD, EBML_LEVEL1, 0, 0, { .n = matroska_seekhead } },
701 { 0 } /* We don't want to go back to level 0, so don't add the parent. */
704 static EbmlSyntax matroska_segments[] = {
705 { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, { .n = matroska_segment } },
709 static EbmlSyntax matroska_blockmore[] = {
710 { MATROSKA_ID_BLOCKADDID, EBML_UINT, 0, offsetof(MatroskaBlock,additional_id), { .u = 1 } },
711 { MATROSKA_ID_BLOCKADDITIONAL, EBML_BIN, 0, offsetof(MatroskaBlock,additional) },
712 CHILD_OF(matroska_blockadditions)
715 static EbmlSyntax matroska_blockadditions[] = {
716 { MATROSKA_ID_BLOCKMORE, EBML_NEST, 0, 0, {.n = matroska_blockmore} },
717 CHILD_OF(matroska_blockgroup)
720 static EbmlSyntax matroska_blockgroup[] = {
721 { MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
722 { MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, { .n = matroska_blockadditions} },
723 { MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, offsetof(MatroskaBlock, duration) },
724 { MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, offsetof(MatroskaBlock, discard_padding) },
725 { MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 0, offsetof(MatroskaBlock, reference), { .i = INT64_MIN } },
726 { MATROSKA_ID_CODECSTATE, EBML_NONE },
727 { 1, EBML_UINT, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } },
728 CHILD_OF(matroska_cluster_parsing)
731 // The following array contains SimpleBlock and BlockGroup twice
732 // in order to reuse the other values for matroska_cluster_enter.
733 static EbmlSyntax matroska_cluster_parsing[] = {
734 { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
735 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, 0, 0, { .n = matroska_blockgroup } },
736 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
737 { MATROSKA_ID_SIMPLEBLOCK, EBML_STOP },
738 { MATROSKA_ID_BLOCKGROUP, EBML_STOP },
739 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
740 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
741 CHILD_OF(matroska_segment)
744 static EbmlSyntax matroska_cluster_enter[] = {
745 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = &matroska_cluster_parsing[2] } },
750 static const char *const matroska_doctypes[] = { "matroska", "webm" };
752 static int matroska_read_close(AVFormatContext *s);
755 * This function prepares the status for parsing of level 1 elements.
757 static int matroska_reset_status(MatroskaDemuxContext *matroska,
758 uint32_t id, int64_t position)
761 int64_t err = avio_seek(matroska->ctx->pb, position, SEEK_SET);
766 matroska->current_id = id;
767 matroska->num_levels = 1;
768 matroska->unknown_count = 0;
769 matroska->resync_pos = avio_tell(matroska->ctx->pb);
771 matroska->resync_pos -= (av_log2(id) + 7) / 8;
776 static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos)
778 AVIOContext *pb = matroska->ctx->pb;
781 /* Try to seek to the last position to resync from. If this doesn't work,
782 * we resync from the earliest position available: The start of the buffer. */
783 if (last_pos < avio_tell(pb) && avio_seek(pb, last_pos + 1, SEEK_SET) < 0) {
784 av_log(matroska->ctx, AV_LOG_WARNING,
785 "Seek to desired resync point failed. Seeking to "
786 "earliest point available instead.\n");
787 avio_seek(pb, FFMAX(avio_tell(pb) + (pb->buffer - pb->buf_ptr),
788 last_pos + 1), SEEK_SET);
793 // try to find a toplevel element
794 while (!avio_feof(pb)) {
795 if (id == MATROSKA_ID_INFO || id == MATROSKA_ID_TRACKS ||
796 id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS ||
797 id == MATROSKA_ID_SEEKHEAD || id == MATROSKA_ID_ATTACHMENTS ||
798 id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) {
799 /* Prepare the context for parsing of a level 1 element. */
800 matroska_reset_status(matroska, id, -1);
801 /* Given that we are here means that an error has occurred,
802 * so treat the segment as unknown length in order not to
803 * discard valid data that happens to be beyond the designated
804 * end of the segment. */
805 matroska->levels[0].length = EBML_UNKNOWN_LENGTH;
808 id = (id << 8) | avio_r8(pb);
812 return pb->error ? pb->error : AVERROR_EOF;
816 * Read: an "EBML number", which is defined as a variable-length
817 * array of bytes. The first byte indicates the length by giving a
818 * number of 0-bits followed by a one. The position of the first
819 * "one" bit inside the first byte indicates the length of this
821 * Returns: number of bytes read, < 0 on error
823 static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb,
824 int max_size, uint64_t *number, int eof_forbidden)
830 /* The first byte tells us the length in bytes - except when it is zero. */
835 /* get the length of the EBML number */
836 read = 8 - ff_log2_tab[total];
838 if (!total || read > max_size) {
839 pos = avio_tell(pb) - 1;
841 av_log(matroska->ctx, AV_LOG_ERROR,
842 "0x00 at pos %"PRId64" (0x%"PRIx64") invalid as first byte "
843 "of an EBML number\n", pos, pos);
845 av_log(matroska->ctx, AV_LOG_ERROR,
846 "Length %d indicated by an EBML number's first byte 0x%02x "
847 "at pos %"PRId64" (0x%"PRIx64") exceeds max length %d.\n",
848 read, (uint8_t) total, pos, pos, max_size);
850 return AVERROR_INVALIDDATA;
853 /* read out length */
854 total ^= 1 << ff_log2_tab[total];
856 total = (total << 8) | avio_r8(pb);
858 if (pb->eof_reached) {
870 av_log(matroska->ctx, AV_LOG_ERROR,
871 "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
876 av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
877 "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
884 * Read a EBML length value.
885 * This needs special handling for the "unknown length" case which has multiple
888 static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
891 int res = ebml_read_num(matroska, pb, 8, number, 1);
892 if (res > 0 && *number + 1 == 1ULL << (7 * res))
893 *number = EBML_UNKNOWN_LENGTH;
898 * Read the next element as an unsigned int.
899 * Returns NEEDS_CHECKING.
901 static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num)
905 /* big-endian ordering; build up number */
908 *num = (*num << 8) | avio_r8(pb);
910 return NEEDS_CHECKING;
914 * Read the next element as a signed int.
915 * Returns NEEDS_CHECKING.
917 static int ebml_read_sint(AVIOContext *pb, int size, int64_t *num)
924 *num = sign_extend(avio_r8(pb), 8);
926 /* big-endian ordering; build up number */
928 *num = ((uint64_t)*num << 8) | avio_r8(pb);
931 return NEEDS_CHECKING;
935 * Read the next element as a float.
936 * Returns NEEDS_CHECKING or < 0 on obvious failure.
938 static int ebml_read_float(AVIOContext *pb, int size, double *num)
943 *num = av_int2float(avio_rb32(pb));
945 *num = av_int2double(avio_rb64(pb));
947 return AVERROR_INVALIDDATA;
949 return NEEDS_CHECKING;
953 * Read the next element as an ASCII string.
954 * 0 is success, < 0 or NEEDS_CHECKING is failure.
956 static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
961 /* EBML strings are usually not 0-terminated, so we allocate one
962 * byte more, read the string and NULL-terminate it ourselves. */
963 if (!(res = av_malloc(size + 1)))
964 return AVERROR(ENOMEM);
965 if ((ret = avio_read(pb, (uint8_t *) res, size)) != size) {
967 return ret < 0 ? ret : NEEDS_CHECKING;
977 * Read the next element as binary data.
978 * 0 is success, < 0 or NEEDS_CHECKING is failure.
980 static int ebml_read_binary(AVIOContext *pb, int length,
981 int64_t pos, EbmlBin *bin)
985 ret = av_buffer_realloc(&bin->buf, length + AV_INPUT_BUFFER_PADDING_SIZE);
988 memset(bin->buf->data + length, 0, AV_INPUT_BUFFER_PADDING_SIZE);
990 bin->data = bin->buf->data;
993 if ((ret = avio_read(pb, bin->data, length)) != length) {
994 av_buffer_unref(&bin->buf);
997 return ret < 0 ? ret : NEEDS_CHECKING;
1004 * Read the next element, but only the header. The contents
1005 * are supposed to be sub-elements which can be read separately.
1006 * 0 is success, < 0 is failure.
1008 static int ebml_read_master(MatroskaDemuxContext *matroska,
1009 uint64_t length, int64_t pos)
1011 MatroskaLevel *level;
1013 if (matroska->num_levels >= EBML_MAX_DEPTH) {
1014 av_log(matroska->ctx, AV_LOG_ERROR,
1015 "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
1016 return AVERROR(ENOSYS);
1019 level = &matroska->levels[matroska->num_levels++];
1021 level->length = length;
1027 * Read a signed "EBML number"
1028 * Return: number of bytes processed, < 0 on error
1030 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
1031 AVIOContext *pb, int64_t *num)
1036 /* read as unsigned number first */
1037 if ((res = ebml_read_num(matroska, pb, 8, &unum, 1)) < 0)
1040 /* make signed (weird way) */
1041 *num = unum - ((1LL << (7 * res - 1)) - 1);
1046 static int ebml_parse(MatroskaDemuxContext *matroska,
1047 EbmlSyntax *syntax, void *data);
1049 static EbmlSyntax *ebml_parse_id(EbmlSyntax *syntax, uint32_t id)
1053 // Whoever touches this should be aware of the duplication
1054 // existing in matroska_cluster_parsing.
1055 for (i = 0; syntax[i].id; i++)
1056 if (id == syntax[i].id)
1062 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
1068 for (int i = 0; syntax[i].id; i++)
1069 switch (syntax[i].type) {
1071 *(uint64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.u;
1074 *(int64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.i;
1077 *(double *) ((char *) data + syntax[i].data_offset) = syntax[i].def.f;
1081 // the default may be NULL
1082 if (syntax[i].def.s) {
1083 uint8_t **dst = (uint8_t **) ((uint8_t *) data + syntax[i].data_offset);
1084 *dst = av_strdup(syntax[i].def.s);
1086 return AVERROR(ENOMEM);
1091 if (!matroska->levels[matroska->num_levels - 1].length) {
1092 matroska->num_levels--;
1098 res = ebml_parse(matroska, syntax, data);
1101 return res == LEVEL_ENDED ? 0 : res;
1104 static int is_ebml_id_valid(uint32_t id)
1106 // Due to endian nonsense in Matroska, the highest byte with any bits set
1107 // will contain the leading length bit. This bit in turn identifies the
1108 // total byte length of the element by its position within the byte.
1109 unsigned int bits = av_log2(id);
1110 return id && (bits + 7) / 8 == (8 - bits % 8);
1114 * Allocate and return the entry for the level1 element with the given ID. If
1115 * an entry already exists, return the existing entry.
1117 static MatroskaLevel1Element *matroska_find_level1_elem(MatroskaDemuxContext *matroska,
1121 MatroskaLevel1Element *elem;
1123 if (!is_ebml_id_valid(id))
1126 // Some files link to all clusters; useless.
1127 if (id == MATROSKA_ID_CLUSTER)
1130 // There can be multiple seekheads.
1131 if (id != MATROSKA_ID_SEEKHEAD) {
1132 for (i = 0; i < matroska->num_level1_elems; i++) {
1133 if (matroska->level1_elems[i].id == id)
1134 return &matroska->level1_elems[i];
1138 // Only a completely broken file would have more elements.
1139 // It also provides a low-effort way to escape from circular seekheads
1140 // (every iteration will add a level1 entry).
1141 if (matroska->num_level1_elems >= FF_ARRAY_ELEMS(matroska->level1_elems)) {
1142 av_log(matroska->ctx, AV_LOG_ERROR, "Too many level1 elements or circular seekheads.\n");
1146 elem = &matroska->level1_elems[matroska->num_level1_elems++];
1147 *elem = (MatroskaLevel1Element){.id = id};
1152 static int ebml_parse(MatroskaDemuxContext *matroska,
1153 EbmlSyntax *syntax, void *data)
1155 static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
1156 // Forbid unknown-length EBML_NONE elements.
1157 [EBML_NONE] = EBML_UNKNOWN_LENGTH - 1,
1161 // max. 16 MB for strings
1162 [EBML_STR] = 0x1000000,
1163 [EBML_UTF8] = 0x1000000,
1164 // max. 256 MB for binary data
1165 [EBML_BIN] = 0x10000000,
1166 // no limits for anything else
1168 AVIOContext *pb = matroska->ctx->pb;
1171 int64_t pos = avio_tell(pb), pos_alt;
1172 int res, update_pos = 1, level_check;
1173 MatroskaLevel1Element *level1_elem;
1174 MatroskaLevel *level = matroska->num_levels ? &matroska->levels[matroska->num_levels - 1] : NULL;
1176 if (!matroska->current_id) {
1178 res = ebml_read_num(matroska, pb, 4, &id, 0);
1180 if (pb->eof_reached && res == AVERROR_EOF) {
1181 if (matroska->is_live)
1182 // in live mode, finish parsing if EOF is reached.
1184 if (level && pos == avio_tell(pb)) {
1185 if (level->length == EBML_UNKNOWN_LENGTH) {
1186 // Unknown-length levels automatically end at EOF.
1187 matroska->num_levels--;
1190 av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
1191 "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
1197 matroska->current_id = id | 1 << 7 * res;
1198 pos_alt = pos + res;
1201 pos -= (av_log2(matroska->current_id) + 7) / 8;
1204 id = matroska->current_id;
1206 syntax = ebml_parse_id(syntax, id);
1207 if (!syntax->id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
1208 if (level && level->length == EBML_UNKNOWN_LENGTH) {
1209 // Unknown-length levels end when an element from an upper level
1210 // in the hierarchy is encountered.
1211 while (syntax->def.n) {
1212 syntax = ebml_parse_id(syntax->def.n, id);
1214 matroska->num_levels--;
1220 av_log(matroska->ctx, AV_LOG_DEBUG, "Unknown entry 0x%"PRIX32" at pos. "
1221 "%"PRId64"\n", id, pos);
1222 update_pos = 0; /* Don't update resync_pos as an error might have happened. */
1226 data = (char *) data + syntax->data_offset;
1227 if (syntax->list_elem_size) {
1228 EbmlList *list = data;
1231 if ((unsigned)list->nb_elem + 1 >= UINT_MAX / syntax->list_elem_size)
1232 return AVERROR(ENOMEM);
1233 newelem = av_fast_realloc(list->elem,
1234 &list->alloc_elem_size,
1235 (list->nb_elem + 1) * syntax->list_elem_size);
1237 return AVERROR(ENOMEM);
1238 list->elem = newelem;
1239 data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
1240 memset(data, 0, syntax->list_elem_size);
1245 if (syntax->type != EBML_STOP) {
1246 matroska->current_id = 0;
1247 if ((res = ebml_read_length(matroska, pb, &length)) < 0)
1252 if (matroska->num_levels > 0) {
1253 if (length != EBML_UNKNOWN_LENGTH &&
1254 level->length != EBML_UNKNOWN_LENGTH) {
1255 uint64_t elem_end = pos_alt + length,
1256 level_end = level->start + level->length;
1258 if (elem_end < level_end) {
1260 } else if (elem_end == level_end) {
1261 level_check = LEVEL_ENDED;
1263 av_log(matroska->ctx, AV_LOG_ERROR,
1264 "Element at 0x%"PRIx64" ending at 0x%"PRIx64" exceeds "
1265 "containing master element ending at 0x%"PRIx64"\n",
1266 pos, elem_end, level_end);
1267 return AVERROR_INVALIDDATA;
1269 } else if (length != EBML_UNKNOWN_LENGTH) {
1271 } else if (level->length != EBML_UNKNOWN_LENGTH) {
1272 av_log(matroska->ctx, AV_LOG_ERROR, "Unknown-sized element "
1273 "at 0x%"PRIx64" inside parent with finite size\n", pos);
1274 return AVERROR_INVALIDDATA;
1277 if (id != MATROSKA_ID_CLUSTER && (syntax->type == EBML_LEVEL1
1278 || syntax->type == EBML_NEST)) {
1279 // According to the current specifications only clusters and
1280 // segments are allowed to be unknown-length. We also accept
1281 // other unknown-length master elements.
1282 av_log(matroska->ctx, AV_LOG_WARNING,
1283 "Found unknown-length element 0x%"PRIX32" other than "
1284 "a cluster at 0x%"PRIx64". Spec-incompliant, but "
1285 "parsing will nevertheless be attempted.\n", id, pos);
1292 if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
1293 if (length != EBML_UNKNOWN_LENGTH) {
1294 av_log(matroska->ctx, AV_LOG_ERROR,
1295 "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for element "
1296 "with ID 0x%"PRIX32" at 0x%"PRIx64"\n",
1297 length, max_lengths[syntax->type], id, pos);
1298 } else if (syntax->type != EBML_NONE) {
1299 av_log(matroska->ctx, AV_LOG_ERROR,
1300 "Element with ID 0x%"PRIX32" at pos. 0x%"PRIx64" has "
1301 "unknown length, yet the length of an element of its "
1302 "type must be known.\n", id, pos);
1304 av_log(matroska->ctx, AV_LOG_ERROR,
1305 "Found unknown-length element with ID 0x%"PRIX32" at "
1306 "pos. 0x%"PRIx64" for which no syntax for parsing is "
1307 "available.\n", id, pos);
1309 return AVERROR_INVALIDDATA;
1312 if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
1313 // Loosing sync will likely manifest itself as encountering unknown
1314 // elements which are not reliably distinguishable from elements
1315 // belonging to future extensions of the format.
1316 // We use a heuristic to detect such situations: If the current
1317 // element is not expected at the current syntax level and there
1318 // were only a few unknown elements in a row, then the element is
1319 // skipped or considered defective based upon the length of the
1320 // current element (i.e. how much would be skipped); if there were
1321 // more than a few skipped elements in a row and skipping the current
1322 // element would lead us more than SKIP_THRESHOLD away from the last
1323 // known good position, then it is inferred that an error occurred.
1324 // The dependency on the number of unknown elements in a row exists
1325 // because the distance to the last known good position is
1326 // automatically big if the last parsed element was big.
1327 // In both cases, each unknown element is considered equivalent to
1328 // UNKNOWN_EQUIV of skipped bytes for the check.
1329 // The whole check is only done for non-seekable output, because
1330 // in this situation skipped data can't simply be rechecked later.
1331 // This is especially important when using unkown length elements
1332 // as the check for whether a child exceeds its containing master
1333 // element is not effective in this situation.
1335 matroska->unknown_count = 0;
1337 int64_t dist = length + UNKNOWN_EQUIV * matroska->unknown_count++;
1339 if (matroska->unknown_count > 3)
1340 dist += pos_alt - matroska->resync_pos;
1342 if (dist > SKIP_THRESHOLD) {
1343 av_log(matroska->ctx, AV_LOG_ERROR,
1344 "Unknown element %"PRIX32" at pos. 0x%"PRIx64" with "
1345 "length 0x%"PRIx64" considered as invalid data. Last "
1346 "known good position 0x%"PRIx64", %d unknown elements"
1347 " in a row\n", id, pos, length, matroska->resync_pos,
1348 matroska->unknown_count);
1349 return AVERROR_INVALIDDATA;
1354 if (update_pos > 0) {
1355 // We have found an element that is allowed at this place
1356 // in the hierarchy and it passed all checks, so treat the beginning
1357 // of the element as the "last known good" position.
1358 matroska->resync_pos = pos;
1361 if (!data && length != EBML_UNKNOWN_LENGTH)
1365 switch (syntax->type) {
1367 res = ebml_read_uint(pb, length, data);
1370 res = ebml_read_sint(pb, length, data);
1373 res = ebml_read_float(pb, length, data);
1377 res = ebml_read_ascii(pb, length, data);
1380 res = ebml_read_binary(pb, length, pos_alt, data);
1384 if ((res = ebml_read_master(matroska, length, pos_alt)) < 0)
1386 if (id == MATROSKA_ID_SEGMENT)
1387 matroska->segment_start = pos_alt;
1388 if (id == MATROSKA_ID_CUES)
1389 matroska->cues_parsing_deferred = 0;
1390 if (syntax->type == EBML_LEVEL1 &&
1391 (level1_elem = matroska_find_level1_elem(matroska, syntax->id))) {
1392 if (!level1_elem->pos) {
1393 // Zero is not a valid position for a level 1 element.
1394 level1_elem->pos = pos;
1395 } else if (level1_elem->pos != pos)
1396 av_log(matroska->ctx, AV_LOG_ERROR, "Duplicate element\n");
1397 level1_elem->parsed = 1;
1399 if (res = ebml_parse_nest(matroska, syntax->def.n, data))
1408 if (ffio_limit(pb, length) != length) {
1409 // ffio_limit emits its own error message,
1410 // so we don't have to.
1411 return AVERROR(EIO);
1413 if ((res2 = avio_skip(pb, length - 1)) >= 0) {
1414 // avio_skip might take us past EOF. We check for this
1415 // by skipping only length - 1 bytes, reading a byte and
1416 // checking the error flags. This is done in order to check
1417 // that the element has been properly skipped even when
1418 // no filesize (that ffio_limit relies on) is available.
1420 res = NEEDS_CHECKING;
1427 if (res == NEEDS_CHECKING) {
1428 if (pb->eof_reached) {
1437 if (res == AVERROR_INVALIDDATA)
1438 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
1439 else if (res == AVERROR(EIO))
1440 av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
1441 else if (res == AVERROR_EOF) {
1442 av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely\n");
1450 if (level_check == LEVEL_ENDED && matroska->num_levels) {
1451 level = &matroska->levels[matroska->num_levels - 1];
1452 pos = avio_tell(pb);
1454 // Given that pos >= level->start no check for
1455 // level->length != EBML_UNKNOWN_LENGTH is necessary.
1456 while (matroska->num_levels && pos == level->start + level->length) {
1457 matroska->num_levels--;
1465 static void ebml_free(EbmlSyntax *syntax, void *data)
1468 for (i = 0; syntax[i].id; i++) {
1469 void *data_off = (char *) data + syntax[i].data_offset;
1470 switch (syntax[i].type) {
1476 av_buffer_unref(&((EbmlBin *) data_off)->buf);
1480 if (syntax[i].list_elem_size) {
1481 EbmlList *list = data_off;
1482 char *ptr = list->elem;
1483 for (j = 0; j < list->nb_elem;
1484 j++, ptr += syntax[i].list_elem_size)
1485 ebml_free(syntax[i].def.n, ptr);
1486 av_freep(&list->elem);
1488 list->alloc_elem_size = 0;
1490 ebml_free(syntax[i].def.n, data_off);
1500 static int matroska_probe(const AVProbeData *p)
1503 int len_mask = 0x80, size = 1, n = 1, i;
1506 if (AV_RB32(p->buf) != EBML_ID_HEADER)
1509 /* length of header */
1511 while (size <= 8 && !(total & len_mask)) {
1517 total &= (len_mask - 1);
1519 total = (total << 8) | p->buf[4 + n++];
1521 if (total + 1 == 1ULL << (7 * size)){
1522 /* Unknown-length header - simply parse the whole buffer. */
1523 total = p->buf_size - 4 - size;
1525 /* Does the probe data contain the whole header? */
1526 if (p->buf_size < 4 + size + total)
1530 /* The header should contain a known document type. For now,
1531 * we don't parse the whole header but simply check for the
1532 * availability of that array of characters inside the header.
1533 * Not fully fool-proof, but good enough. */
1534 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
1535 size_t probelen = strlen(matroska_doctypes[i]);
1536 if (total < probelen)
1538 for (n = 4 + size; n <= 4 + size + total - probelen; n++)
1539 if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
1540 return AVPROBE_SCORE_MAX;
1543 // probably valid EBML header but no recognized doctype
1544 return AVPROBE_SCORE_EXTENSION;
1547 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
1550 MatroskaTrack *tracks = matroska->tracks.elem;
1553 for (i = 0; i < matroska->tracks.nb_elem; i++)
1554 if (tracks[i].num == num)
1557 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
1561 static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
1562 MatroskaTrack *track)
1564 MatroskaTrackEncoding *encodings = track->encodings.elem;
1565 uint8_t *data = *buf;
1566 int isize = *buf_size;
1567 uint8_t *pkt_data = NULL;
1568 uint8_t av_unused *newpktdata;
1569 int pkt_size = isize;
1573 if (pkt_size >= 10000000U)
1574 return AVERROR_INVALIDDATA;
1576 switch (encodings[0].compression.algo) {
1577 case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
1579 int header_size = encodings[0].compression.settings.size;
1580 uint8_t *header = encodings[0].compression.settings.data;
1582 if (header_size && !header) {
1583 av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
1590 pkt_size = isize + header_size;
1591 pkt_data = av_malloc(pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1593 return AVERROR(ENOMEM);
1595 memcpy(pkt_data, header, header_size);
1596 memcpy(pkt_data + header_size, data, isize);
1600 case MATROSKA_TRACK_ENCODING_COMP_LZO:
1603 olen = pkt_size *= 3;
1604 newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING
1605 + AV_INPUT_BUFFER_PADDING_SIZE);
1607 result = AVERROR(ENOMEM);
1610 pkt_data = newpktdata;
1611 result = av_lzo1x_decode(pkt_data, &olen, data, &insize);
1612 } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
1614 result = AVERROR_INVALIDDATA;
1621 case MATROSKA_TRACK_ENCODING_COMP_ZLIB:
1623 z_stream zstream = { 0 };
1624 if (inflateInit(&zstream) != Z_OK)
1626 zstream.next_in = data;
1627 zstream.avail_in = isize;
1630 newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1632 inflateEnd(&zstream);
1633 result = AVERROR(ENOMEM);
1636 pkt_data = newpktdata;
1637 zstream.avail_out = pkt_size - zstream.total_out;
1638 zstream.next_out = pkt_data + zstream.total_out;
1639 result = inflate(&zstream, Z_NO_FLUSH);
1640 } while (result == Z_OK && pkt_size < 10000000);
1641 pkt_size = zstream.total_out;
1642 inflateEnd(&zstream);
1643 if (result != Z_STREAM_END) {
1644 if (result == Z_MEM_ERROR)
1645 result = AVERROR(ENOMEM);
1647 result = AVERROR_INVALIDDATA;
1654 case MATROSKA_TRACK_ENCODING_COMP_BZLIB:
1656 bz_stream bzstream = { 0 };
1657 if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1659 bzstream.next_in = data;
1660 bzstream.avail_in = isize;
1663 newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1665 BZ2_bzDecompressEnd(&bzstream);
1666 result = AVERROR(ENOMEM);
1669 pkt_data = newpktdata;
1670 bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1671 bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1672 result = BZ2_bzDecompress(&bzstream);
1673 } while (result == BZ_OK && pkt_size < 10000000);
1674 pkt_size = bzstream.total_out_lo32;
1675 BZ2_bzDecompressEnd(&bzstream);
1676 if (result != BZ_STREAM_END) {
1677 if (result == BZ_MEM_ERROR)
1678 result = AVERROR(ENOMEM);
1680 result = AVERROR_INVALIDDATA;
1687 return AVERROR_INVALIDDATA;
1690 memset(pkt_data + pkt_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1693 *buf_size = pkt_size;
1701 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1702 AVDictionary **metadata, char *prefix)
1704 MatroskaTag *tags = list->elem;
1708 for (i = 0; i < list->nb_elem; i++) {
1709 const char *lang = tags[i].lang &&
1710 strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1712 if (!tags[i].name) {
1713 av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1717 snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1719 av_strlcpy(key, tags[i].name, sizeof(key));
1720 if (tags[i].def || !lang) {
1721 av_dict_set(metadata, key, tags[i].string, 0);
1722 if (tags[i].sub.nb_elem)
1723 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1726 av_strlcat(key, "-", sizeof(key));
1727 av_strlcat(key, lang, sizeof(key));
1728 av_dict_set(metadata, key, tags[i].string, 0);
1729 if (tags[i].sub.nb_elem)
1730 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1733 ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
1736 static void matroska_convert_tags(AVFormatContext *s)
1738 MatroskaDemuxContext *matroska = s->priv_data;
1739 MatroskaTags *tags = matroska->tags.elem;
1742 for (i = 0; i < matroska->tags.nb_elem; i++) {
1743 if (tags[i].target.attachuid) {
1744 MatroskaAttachment *attachment = matroska->attachments.elem;
1746 for (j = 0; j < matroska->attachments.nb_elem; j++) {
1747 if (attachment[j].uid == tags[i].target.attachuid &&
1748 attachment[j].stream) {
1749 matroska_convert_tag(s, &tags[i].tag,
1750 &attachment[j].stream->metadata, NULL);
1755 av_log(NULL, AV_LOG_WARNING,
1756 "The tags at index %d refer to a "
1757 "non-existent attachment %"PRId64".\n",
1758 i, tags[i].target.attachuid);
1760 } else if (tags[i].target.chapteruid) {
1761 MatroskaChapter *chapter = matroska->chapters.elem;
1763 for (j = 0; j < matroska->chapters.nb_elem; j++) {
1764 if (chapter[j].uid == tags[i].target.chapteruid &&
1765 chapter[j].chapter) {
1766 matroska_convert_tag(s, &tags[i].tag,
1767 &chapter[j].chapter->metadata, NULL);
1772 av_log(NULL, AV_LOG_WARNING,
1773 "The tags at index %d refer to a non-existent chapter "
1775 i, tags[i].target.chapteruid);
1777 } else if (tags[i].target.trackuid) {
1778 MatroskaTrack *track = matroska->tracks.elem;
1780 for (j = 0; j < matroska->tracks.nb_elem; j++) {
1781 if (track[j].uid == tags[i].target.trackuid &&
1783 matroska_convert_tag(s, &tags[i].tag,
1784 &track[j].stream->metadata, NULL);
1789 av_log(NULL, AV_LOG_WARNING,
1790 "The tags at index %d refer to a non-existent track "
1792 i, tags[i].target.trackuid);
1795 matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1796 tags[i].target.type);
1801 static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
1804 uint32_t saved_id = matroska->current_id;
1805 int64_t before_pos = avio_tell(matroska->ctx->pb);
1809 if (avio_seek(matroska->ctx->pb, pos, SEEK_SET) == pos) {
1810 /* We don't want to lose our seekhead level, so we add
1811 * a dummy. This is a crude hack. */
1812 if (matroska->num_levels == EBML_MAX_DEPTH) {
1813 av_log(matroska->ctx, AV_LOG_INFO,
1814 "Max EBML element depth (%d) reached, "
1815 "cannot parse further.\n", EBML_MAX_DEPTH);
1816 ret = AVERROR_INVALIDDATA;
1818 matroska->levels[matroska->num_levels] = (MatroskaLevel) { 0, EBML_UNKNOWN_LENGTH };
1819 matroska->num_levels++;
1820 matroska->current_id = 0;
1822 ret = ebml_parse(matroska, matroska_segment, matroska);
1823 if (ret == LEVEL_ENDED) {
1824 /* This can only happen if the seek brought us beyond EOF. */
1829 /* Seek back - notice that in all instances where this is used
1830 * it is safe to set the level to 1. */
1831 matroska_reset_status(matroska, saved_id, before_pos);
1836 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1838 EbmlList *seekhead_list = &matroska->seekhead;
1841 // we should not do any seeking in the streaming case
1842 if (!(matroska->ctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
1845 for (i = 0; i < seekhead_list->nb_elem; i++) {
1846 MatroskaSeekhead *seekheads = seekhead_list->elem;
1847 uint32_t id = seekheads[i].id;
1848 int64_t pos = seekheads[i].pos + matroska->segment_start;
1850 MatroskaLevel1Element *elem = matroska_find_level1_elem(matroska, id);
1851 if (!elem || elem->parsed)
1856 // defer cues parsing until we actually need cue data.
1857 if (id == MATROSKA_ID_CUES)
1860 if (matroska_parse_seekhead_entry(matroska, pos) < 0) {
1861 // mark index as broken
1862 matroska->cues_parsing_deferred = -1;
1870 static void matroska_add_index_entries(MatroskaDemuxContext *matroska)
1872 EbmlList *index_list;
1873 MatroskaIndex *index;
1874 uint64_t index_scale = 1;
1877 if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1880 index_list = &matroska->index;
1881 index = index_list->elem;
1882 if (index_list->nb_elem < 2)
1884 if (index[1].time > 1E14 / matroska->time_scale) {
1885 av_log(matroska->ctx, AV_LOG_WARNING, "Dropping apparently-broken index.\n");
1888 for (i = 0; i < index_list->nb_elem; i++) {
1889 EbmlList *pos_list = &index[i].pos;
1890 MatroskaIndexPos *pos = pos_list->elem;
1891 for (j = 0; j < pos_list->nb_elem; j++) {
1892 MatroskaTrack *track = matroska_find_track_by_num(matroska,
1894 if (track && track->stream)
1895 av_add_index_entry(track->stream,
1896 pos[j].pos + matroska->segment_start,
1897 index[i].time / index_scale, 0, 0,
1903 static void matroska_parse_cues(MatroskaDemuxContext *matroska) {
1906 if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1909 for (i = 0; i < matroska->num_level1_elems; i++) {
1910 MatroskaLevel1Element *elem = &matroska->level1_elems[i];
1911 if (elem->id == MATROSKA_ID_CUES && !elem->parsed) {
1912 if (matroska_parse_seekhead_entry(matroska, elem->pos) < 0)
1913 matroska->cues_parsing_deferred = -1;
1919 matroska_add_index_entries(matroska);
1922 static int matroska_aac_profile(char *codec_id)
1924 static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
1927 for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
1928 if (strstr(codec_id, aac_profiles[profile]))
1933 static int matroska_aac_sri(int samplerate)
1937 for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
1938 if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
1943 static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
1945 /* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
1946 avpriv_dict_set_timestamp(metadata, "creation_time", date_utc / 1000 + 978307200000000LL);
1949 static int matroska_parse_flac(AVFormatContext *s,
1950 MatroskaTrack *track,
1953 AVStream *st = track->stream;
1954 uint8_t *p = track->codec_priv.data;
1955 int size = track->codec_priv.size;
1957 if (size < 8 + FLAC_STREAMINFO_SIZE || p[4] & 0x7f) {
1958 av_log(s, AV_LOG_WARNING, "Invalid FLAC private data\n");
1959 track->codec_priv.size = 0;
1963 track->codec_priv.size = 8 + FLAC_STREAMINFO_SIZE;
1965 p += track->codec_priv.size;
1966 size -= track->codec_priv.size;
1968 /* parse the remaining metadata blocks if present */
1970 int block_last, block_type, block_size;
1972 flac_parse_block_header(p, &block_last, &block_type, &block_size);
1976 if (block_size > size)
1979 /* check for the channel mask */
1980 if (block_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
1981 AVDictionary *dict = NULL;
1982 AVDictionaryEntry *chmask;
1984 ff_vorbis_comment(s, &dict, p, block_size, 0);
1985 chmask = av_dict_get(dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
1987 uint64_t mask = strtol(chmask->value, NULL, 0);
1988 if (!mask || mask & ~0x3ffffULL) {
1989 av_log(s, AV_LOG_WARNING,
1990 "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
1992 st->codecpar->channel_layout = mask;
1994 av_dict_free(&dict);
2004 static int mkv_field_order(MatroskaDemuxContext *matroska, int64_t field_order)
2006 int major, minor, micro, bttb = 0;
2008 /* workaround a bug in our Matroska muxer, introduced in version 57.36 alongside
2009 * this function, and fixed in 57.52 */
2010 if (matroska->muxingapp && sscanf(matroska->muxingapp, "Lavf%d.%d.%d", &major, &minor, µ) == 3)
2011 bttb = (major == 57 && minor >= 36 && minor <= 51 && micro >= 100);
2013 switch (field_order) {
2014 case MATROSKA_VIDEO_FIELDORDER_PROGRESSIVE:
2015 return AV_FIELD_PROGRESSIVE;
2016 case MATROSKA_VIDEO_FIELDORDER_UNDETERMINED:
2017 return AV_FIELD_UNKNOWN;
2018 case MATROSKA_VIDEO_FIELDORDER_TT:
2020 case MATROSKA_VIDEO_FIELDORDER_BB:
2022 case MATROSKA_VIDEO_FIELDORDER_BT:
2023 return bttb ? AV_FIELD_TB : AV_FIELD_BT;
2024 case MATROSKA_VIDEO_FIELDORDER_TB:
2025 return bttb ? AV_FIELD_BT : AV_FIELD_TB;
2027 return AV_FIELD_UNKNOWN;
2031 static void mkv_stereo_mode_display_mul(int stereo_mode,
2032 int *h_width, int *h_height)
2034 switch (stereo_mode) {
2035 case MATROSKA_VIDEO_STEREOMODE_TYPE_MONO:
2036 case MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_RL:
2037 case MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR:
2038 case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_RL:
2039 case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR:
2041 case MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT:
2042 case MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT:
2043 case MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_RL:
2044 case MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR:
2047 case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTTOM_TOP:
2048 case MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM:
2049 case MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_RL:
2050 case MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR:
2056 static int mkv_parse_video_color(AVStream *st, const MatroskaTrack *track) {
2057 const MatroskaTrackVideoColor *color = track->video.color.elem;
2058 const MatroskaMasteringMeta *mastering_meta;
2059 int has_mastering_primaries, has_mastering_luminance;
2061 if (!track->video.color.nb_elem)
2064 mastering_meta = &color->mastering_meta;
2065 // Mastering primaries are CIE 1931 coords, and must be > 0.
2066 has_mastering_primaries =
2067 mastering_meta->r_x > 0 && mastering_meta->r_y > 0 &&
2068 mastering_meta->g_x > 0 && mastering_meta->g_y > 0 &&
2069 mastering_meta->b_x > 0 && mastering_meta->b_y > 0 &&
2070 mastering_meta->white_x > 0 && mastering_meta->white_y > 0;
2071 has_mastering_luminance = mastering_meta->max_luminance > 0;
2073 if (color->matrix_coefficients != AVCOL_SPC_RESERVED)
2074 st->codecpar->color_space = color->matrix_coefficients;
2075 if (color->primaries != AVCOL_PRI_RESERVED &&
2076 color->primaries != AVCOL_PRI_RESERVED0)
2077 st->codecpar->color_primaries = color->primaries;
2078 if (color->transfer_characteristics != AVCOL_TRC_RESERVED &&
2079 color->transfer_characteristics != AVCOL_TRC_RESERVED0)
2080 st->codecpar->color_trc = color->transfer_characteristics;
2081 if (color->range != AVCOL_RANGE_UNSPECIFIED &&
2082 color->range <= AVCOL_RANGE_JPEG)
2083 st->codecpar->color_range = color->range;
2084 if (color->chroma_siting_horz != MATROSKA_COLOUR_CHROMASITINGHORZ_UNDETERMINED &&
2085 color->chroma_siting_vert != MATROSKA_COLOUR_CHROMASITINGVERT_UNDETERMINED &&
2086 color->chroma_siting_horz < MATROSKA_COLOUR_CHROMASITINGHORZ_NB &&
2087 color->chroma_siting_vert < MATROSKA_COLOUR_CHROMASITINGVERT_NB) {
2088 st->codecpar->chroma_location =
2089 avcodec_chroma_pos_to_enum((color->chroma_siting_horz - 1) << 7,
2090 (color->chroma_siting_vert - 1) << 7);
2092 if (color->max_cll && color->max_fall) {
2095 AVContentLightMetadata *metadata = av_content_light_metadata_alloc(&size);
2097 return AVERROR(ENOMEM);
2098 ret = av_stream_add_side_data(st, AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
2099 (uint8_t *)metadata, size);
2101 av_freep(&metadata);
2104 metadata->MaxCLL = color->max_cll;
2105 metadata->MaxFALL = color->max_fall;
2108 if (has_mastering_primaries || has_mastering_luminance) {
2109 AVMasteringDisplayMetadata *metadata =
2110 (AVMasteringDisplayMetadata*) av_stream_new_side_data(
2111 st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
2112 sizeof(AVMasteringDisplayMetadata));
2114 return AVERROR(ENOMEM);
2116 memset(metadata, 0, sizeof(AVMasteringDisplayMetadata));
2117 if (has_mastering_primaries) {
2118 metadata->display_primaries[0][0] = av_d2q(mastering_meta->r_x, INT_MAX);
2119 metadata->display_primaries[0][1] = av_d2q(mastering_meta->r_y, INT_MAX);
2120 metadata->display_primaries[1][0] = av_d2q(mastering_meta->g_x, INT_MAX);
2121 metadata->display_primaries[1][1] = av_d2q(mastering_meta->g_y, INT_MAX);
2122 metadata->display_primaries[2][0] = av_d2q(mastering_meta->b_x, INT_MAX);
2123 metadata->display_primaries[2][1] = av_d2q(mastering_meta->b_y, INT_MAX);
2124 metadata->white_point[0] = av_d2q(mastering_meta->white_x, INT_MAX);
2125 metadata->white_point[1] = av_d2q(mastering_meta->white_y, INT_MAX);
2126 metadata->has_primaries = 1;
2128 if (has_mastering_luminance) {
2129 metadata->max_luminance = av_d2q(mastering_meta->max_luminance, INT_MAX);
2130 metadata->min_luminance = av_d2q(mastering_meta->min_luminance, INT_MAX);
2131 metadata->has_luminance = 1;
2137 static int mkv_parse_video_projection(AVStream *st, const MatroskaTrack *track) {
2138 AVSphericalMapping *spherical;
2139 enum AVSphericalProjection projection;
2140 size_t spherical_size;
2141 uint32_t l = 0, t = 0, r = 0, b = 0;
2142 uint32_t padding = 0;
2146 bytestream2_init(&gb, track->video.projection.private.data,
2147 track->video.projection.private.size);
2149 if (bytestream2_get_byte(&gb) != 0) {
2150 av_log(NULL, AV_LOG_WARNING, "Unknown spherical metadata\n");
2154 bytestream2_skip(&gb, 3); // flags
2156 switch (track->video.projection.type) {
2157 case MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR:
2158 if (track->video.projection.private.size == 20) {
2159 t = bytestream2_get_be32(&gb);
2160 b = bytestream2_get_be32(&gb);
2161 l = bytestream2_get_be32(&gb);
2162 r = bytestream2_get_be32(&gb);
2164 if (b >= UINT_MAX - t || r >= UINT_MAX - l) {
2165 av_log(NULL, AV_LOG_ERROR,
2166 "Invalid bounding rectangle coordinates "
2167 "%"PRIu32",%"PRIu32",%"PRIu32",%"PRIu32"\n",
2169 return AVERROR_INVALIDDATA;
2171 } else if (track->video.projection.private.size != 0) {
2172 av_log(NULL, AV_LOG_ERROR, "Unknown spherical metadata\n");
2173 return AVERROR_INVALIDDATA;
2176 if (l || t || r || b)
2177 projection = AV_SPHERICAL_EQUIRECTANGULAR_TILE;
2179 projection = AV_SPHERICAL_EQUIRECTANGULAR;
2181 case MATROSKA_VIDEO_PROJECTION_TYPE_CUBEMAP:
2182 if (track->video.projection.private.size < 4) {
2183 av_log(NULL, AV_LOG_ERROR, "Missing projection private properties\n");
2184 return AVERROR_INVALIDDATA;
2185 } else if (track->video.projection.private.size == 12) {
2186 uint32_t layout = bytestream2_get_be32(&gb);
2188 av_log(NULL, AV_LOG_WARNING,
2189 "Unknown spherical cubemap layout %"PRIu32"\n", layout);
2192 projection = AV_SPHERICAL_CUBEMAP;
2193 padding = bytestream2_get_be32(&gb);
2195 av_log(NULL, AV_LOG_ERROR, "Unknown spherical metadata\n");
2196 return AVERROR_INVALIDDATA;
2199 case MATROSKA_VIDEO_PROJECTION_TYPE_RECTANGULAR:
2200 /* No Spherical metadata */
2203 av_log(NULL, AV_LOG_WARNING,
2204 "Unknown spherical metadata type %"PRIu64"\n",
2205 track->video.projection.type);
2209 spherical = av_spherical_alloc(&spherical_size);
2211 return AVERROR(ENOMEM);
2213 spherical->projection = projection;
2215 spherical->yaw = (int32_t) (track->video.projection.yaw * (1 << 16));
2216 spherical->pitch = (int32_t) (track->video.projection.pitch * (1 << 16));
2217 spherical->roll = (int32_t) (track->video.projection.roll * (1 << 16));
2219 spherical->padding = padding;
2221 spherical->bound_left = l;
2222 spherical->bound_top = t;
2223 spherical->bound_right = r;
2224 spherical->bound_bottom = b;
2226 ret = av_stream_add_side_data(st, AV_PKT_DATA_SPHERICAL, (uint8_t *)spherical,
2229 av_freep(&spherical);
2236 static int get_qt_codec(MatroskaTrack *track, uint32_t *fourcc, enum AVCodecID *codec_id)
2238 const AVCodecTag *codec_tags;
2240 codec_tags = track->type == MATROSKA_TRACK_TYPE_VIDEO ?
2241 ff_codec_movvideo_tags : ff_codec_movaudio_tags;
2243 /* Normalize noncompliant private data that starts with the fourcc
2244 * by expanding/shifting the data by 4 bytes and storing the data
2245 * size at the start. */
2246 if (ff_codec_get_id(codec_tags, AV_RL32(track->codec_priv.data))) {
2247 int ret = av_buffer_realloc(&track->codec_priv.buf,
2248 track->codec_priv.size + 4 + AV_INPUT_BUFFER_PADDING_SIZE);
2252 track->codec_priv.data = track->codec_priv.buf->data;
2253 memmove(track->codec_priv.data + 4, track->codec_priv.data, track->codec_priv.size);
2254 track->codec_priv.size += 4;
2255 AV_WB32(track->codec_priv.data, track->codec_priv.size);
2258 *fourcc = AV_RL32(track->codec_priv.data + 4);
2259 *codec_id = ff_codec_get_id(codec_tags, *fourcc);
2264 static int matroska_parse_tracks(AVFormatContext *s)
2266 MatroskaDemuxContext *matroska = s->priv_data;
2267 MatroskaTrack *tracks = matroska->tracks.elem;
2272 for (i = 0; i < matroska->tracks.nb_elem; i++) {
2273 MatroskaTrack *track = &tracks[i];
2274 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
2275 EbmlList *encodings_list = &track->encodings;
2276 MatroskaTrackEncoding *encodings = encodings_list->elem;
2277 uint8_t *extradata = NULL;
2278 int extradata_size = 0;
2279 int extradata_offset = 0;
2280 uint32_t fourcc = 0;
2282 char* key_id_base64 = NULL;
2285 /* Apply some sanity checks. */
2286 if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
2287 track->type != MATROSKA_TRACK_TYPE_AUDIO &&
2288 track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
2289 track->type != MATROSKA_TRACK_TYPE_METADATA) {
2290 av_log(matroska->ctx, AV_LOG_INFO,
2291 "Unknown or unsupported track type %"PRIu64"\n",
2295 if (!track->codec_id)
2298 if (track->audio.samplerate < 0 || track->audio.samplerate > INT_MAX ||
2299 isnan(track->audio.samplerate)) {
2300 av_log(matroska->ctx, AV_LOG_WARNING,
2301 "Invalid sample rate %f, defaulting to 8000 instead.\n",
2302 track->audio.samplerate);
2303 track->audio.samplerate = 8000;
2306 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2307 if (!track->default_duration && track->video.frame_rate > 0) {
2308 double default_duration = 1000000000 / track->video.frame_rate;
2309 if (default_duration > UINT64_MAX || default_duration < 0) {
2310 av_log(matroska->ctx, AV_LOG_WARNING,
2311 "Invalid frame rate %e. Cannot calculate default duration.\n",
2312 track->video.frame_rate);
2314 track->default_duration = default_duration;
2317 if (track->video.display_width == -1)
2318 track->video.display_width = track->video.pixel_width;
2319 if (track->video.display_height == -1)
2320 track->video.display_height = track->video.pixel_height;
2321 if (track->video.color_space.size == 4)
2322 fourcc = AV_RL32(track->video.color_space.data);
2323 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2324 if (!track->audio.out_samplerate)
2325 track->audio.out_samplerate = track->audio.samplerate;
2327 if (encodings_list->nb_elem > 1) {
2328 av_log(matroska->ctx, AV_LOG_ERROR,
2329 "Multiple combined encodings not supported");
2330 } else if (encodings_list->nb_elem == 1) {
2331 if (encodings[0].type) {
2332 if (encodings[0].encryption.key_id.size > 0) {
2333 /* Save the encryption key id to be stored later as a
2335 const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
2336 key_id_base64 = av_malloc(b64_size);
2337 if (key_id_base64 == NULL)
2338 return AVERROR(ENOMEM);
2340 av_base64_encode(key_id_base64, b64_size,
2341 encodings[0].encryption.key_id.data,
2342 encodings[0].encryption.key_id.size);
2344 encodings[0].scope = 0;
2345 av_log(matroska->ctx, AV_LOG_ERROR,
2346 "Unsupported encoding type");
2350 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
2353 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
2356 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO &&
2358 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP) {
2359 encodings[0].scope = 0;
2360 av_log(matroska->ctx, AV_LOG_ERROR,
2361 "Unsupported encoding type");
2362 } else if (track->codec_priv.size && encodings[0].scope & 2) {
2363 uint8_t *codec_priv = track->codec_priv.data;
2364 int ret = matroska_decode_buffer(&track->codec_priv.data,
2365 &track->codec_priv.size,
2368 track->codec_priv.data = NULL;
2369 track->codec_priv.size = 0;
2370 av_log(matroska->ctx, AV_LOG_ERROR,
2371 "Failed to decode codec private data\n");
2374 if (codec_priv != track->codec_priv.data) {
2375 av_buffer_unref(&track->codec_priv.buf);
2376 if (track->codec_priv.data) {
2377 track->codec_priv.buf = av_buffer_create(track->codec_priv.data,
2378 track->codec_priv.size + AV_INPUT_BUFFER_PADDING_SIZE,
2380 if (!track->codec_priv.buf) {
2381 av_freep(&track->codec_priv.data);
2382 track->codec_priv.size = 0;
2383 return AVERROR(ENOMEM);
2390 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
2391 if (!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
2392 strlen(ff_mkv_codec_tags[j].str))) {
2393 codec_id = ff_mkv_codec_tags[j].id;
2398 st = track->stream = avformat_new_stream(s, NULL);
2400 av_free(key_id_base64);
2401 return AVERROR(ENOMEM);
2404 if (key_id_base64) {
2405 /* export encryption key id as base64 metadata tag */
2406 av_dict_set(&st->metadata, "enc_key_id", key_id_base64,
2407 AV_DICT_DONT_STRDUP_VAL);
2410 if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
2411 track->codec_priv.size >= 40 &&
2412 track->codec_priv.data) {
2413 track->ms_compat = 1;
2414 bit_depth = AV_RL16(track->codec_priv.data + 14);
2415 fourcc = AV_RL32(track->codec_priv.data + 16);
2416 codec_id = ff_codec_get_id(ff_codec_bmp_tags,
2419 codec_id = ff_codec_get_id(ff_codec_movvideo_tags,
2421 extradata_offset = 40;
2422 } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
2423 track->codec_priv.size >= 14 &&
2424 track->codec_priv.data) {
2426 ffio_init_context(&b, track->codec_priv.data,
2427 track->codec_priv.size,
2428 0, NULL, NULL, NULL, NULL);
2429 ret = ff_get_wav_header(s, &b, st->codecpar, track->codec_priv.size, 0);
2432 codec_id = st->codecpar->codec_id;
2433 fourcc = st->codecpar->codec_tag;
2434 extradata_offset = FFMIN(track->codec_priv.size, 18);
2435 } else if (!strcmp(track->codec_id, "A_QUICKTIME")
2436 /* Normally 36, but allow noncompliant private data */
2437 && (track->codec_priv.size >= 32)
2438 && (track->codec_priv.data)) {
2439 uint16_t sample_size;
2440 int ret = get_qt_codec(track, &fourcc, &codec_id);
2443 sample_size = AV_RB16(track->codec_priv.data + 26);
2445 if (sample_size == 8) {
2446 fourcc = MKTAG('r','a','w',' ');
2447 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2448 } else if (sample_size == 16) {
2449 fourcc = MKTAG('t','w','o','s');
2450 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2453 if ((fourcc == MKTAG('t','w','o','s') ||
2454 fourcc == MKTAG('s','o','w','t')) &&
2456 codec_id = AV_CODEC_ID_PCM_S8;
2457 } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
2458 (track->codec_priv.size >= 21) &&
2459 (track->codec_priv.data)) {
2460 int ret = get_qt_codec(track, &fourcc, &codec_id);
2463 if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI ")) {
2464 fourcc = MKTAG('S','V','Q','3');
2465 codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
2467 if (codec_id == AV_CODEC_ID_NONE)
2468 av_log(matroska->ctx, AV_LOG_ERROR,
2469 "mov FourCC not found %s.\n", av_fourcc2str(fourcc));
2470 if (track->codec_priv.size >= 86) {
2471 bit_depth = AV_RB16(track->codec_priv.data + 82);
2472 ffio_init_context(&b, track->codec_priv.data,
2473 track->codec_priv.size,
2474 0, NULL, NULL, NULL, NULL);
2475 if (ff_get_qtpalette(codec_id, &b, track->palette)) {
2477 track->has_palette = 1;
2480 } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
2481 switch (track->audio.bitdepth) {
2483 codec_id = AV_CODEC_ID_PCM_U8;
2486 codec_id = AV_CODEC_ID_PCM_S24BE;
2489 codec_id = AV_CODEC_ID_PCM_S32BE;
2492 } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
2493 switch (track->audio.bitdepth) {
2495 codec_id = AV_CODEC_ID_PCM_U8;
2498 codec_id = AV_CODEC_ID_PCM_S24LE;
2501 codec_id = AV_CODEC_ID_PCM_S32LE;
2504 } else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
2505 track->audio.bitdepth == 64) {
2506 codec_id = AV_CODEC_ID_PCM_F64LE;
2507 } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
2508 int profile = matroska_aac_profile(track->codec_id);
2509 int sri = matroska_aac_sri(track->audio.samplerate);
2510 extradata = av_mallocz(5 + AV_INPUT_BUFFER_PADDING_SIZE);
2512 return AVERROR(ENOMEM);
2513 extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
2514 extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
2515 if (strstr(track->codec_id, "SBR")) {
2516 sri = matroska_aac_sri(track->audio.out_samplerate);
2517 extradata[2] = 0x56;
2518 extradata[3] = 0xE5;
2519 extradata[4] = 0x80 | (sri << 3);
2523 } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - AV_INPUT_BUFFER_PADDING_SIZE) {
2524 /* Only ALAC's magic cookie is stored in Matroska's track headers.
2525 * Create the "atom size", "tag", and "tag version" fields the
2526 * decoder expects manually. */
2527 extradata_size = 12 + track->codec_priv.size;
2528 extradata = av_mallocz(extradata_size +
2529 AV_INPUT_BUFFER_PADDING_SIZE);
2531 return AVERROR(ENOMEM);
2532 AV_WB32(extradata, extradata_size);
2533 memcpy(&extradata[4], "alac", 4);
2534 AV_WB32(&extradata[8], 0);
2535 memcpy(&extradata[12], track->codec_priv.data,
2536 track->codec_priv.size);
2537 } else if (codec_id == AV_CODEC_ID_TTA) {
2539 if (track->audio.channels > UINT16_MAX ||
2540 track->audio.bitdepth > UINT16_MAX) {
2541 av_log(matroska->ctx, AV_LOG_WARNING,
2542 "Too large audio channel number %"PRIu64
2543 " or bitdepth %"PRIu64". Skipping track.\n",
2544 track->audio.channels, track->audio.bitdepth);
2545 if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
2546 return AVERROR_INVALIDDATA;
2550 if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
2551 return AVERROR_INVALIDDATA;
2552 extradata_size = 22;
2553 extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
2555 return AVERROR(ENOMEM);
2557 bytestream_put_be32(&ptr, AV_RB32("TTA1"));
2558 bytestream_put_le16(&ptr, 1);
2559 bytestream_put_le16(&ptr, track->audio.channels);
2560 bytestream_put_le16(&ptr, track->audio.bitdepth);
2561 bytestream_put_le32(&ptr, track->audio.out_samplerate);
2562 bytestream_put_le32(&ptr, av_rescale(matroska->duration * matroska->time_scale,
2563 track->audio.out_samplerate,
2564 AV_TIME_BASE * 1000));
2565 } else if (codec_id == AV_CODEC_ID_RV10 ||
2566 codec_id == AV_CODEC_ID_RV20 ||
2567 codec_id == AV_CODEC_ID_RV30 ||
2568 codec_id == AV_CODEC_ID_RV40) {
2569 extradata_offset = 26;
2570 } else if (codec_id == AV_CODEC_ID_RA_144) {
2571 track->audio.out_samplerate = 8000;
2572 track->audio.channels = 1;
2573 } else if ((codec_id == AV_CODEC_ID_RA_288 ||
2574 codec_id == AV_CODEC_ID_COOK ||
2575 codec_id == AV_CODEC_ID_ATRAC3 ||
2576 codec_id == AV_CODEC_ID_SIPR)
2577 && track->codec_priv.data) {
2580 ffio_init_context(&b, track->codec_priv.data,
2581 track->codec_priv.size,
2582 0, NULL, NULL, NULL, NULL);
2584 flavor = avio_rb16(&b);
2585 track->audio.coded_framesize = avio_rb32(&b);
2587 track->audio.sub_packet_h = avio_rb16(&b);
2588 track->audio.frame_size = avio_rb16(&b);
2589 track->audio.sub_packet_size = avio_rb16(&b);
2591 track->audio.coded_framesize <= 0 ||
2592 track->audio.sub_packet_h <= 0 ||
2593 track->audio.frame_size <= 0 ||
2594 track->audio.sub_packet_size <= 0 && codec_id != AV_CODEC_ID_SIPR)
2595 return AVERROR_INVALIDDATA;
2596 track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
2597 track->audio.frame_size);
2598 if (!track->audio.buf)
2599 return AVERROR(ENOMEM);
2600 if (codec_id == AV_CODEC_ID_RA_288) {
2601 st->codecpar->block_align = track->audio.coded_framesize;
2602 track->codec_priv.size = 0;
2604 if (codec_id == AV_CODEC_ID_SIPR && flavor < 4) {
2605 static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
2606 track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
2607 st->codecpar->bit_rate = sipr_bit_rate[flavor];
2609 st->codecpar->block_align = track->audio.sub_packet_size;
2610 extradata_offset = 78;
2612 } else if (codec_id == AV_CODEC_ID_FLAC && track->codec_priv.size) {
2613 ret = matroska_parse_flac(s, track, &extradata_offset);
2616 } else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
2617 fourcc = AV_RL32(track->codec_priv.data);
2618 } else if (codec_id == AV_CODEC_ID_VP9 && track->codec_priv.size) {
2619 /* we don't need any value stored in CodecPrivate.
2620 make sure that it's not exported as extradata. */
2621 track->codec_priv.size = 0;
2622 } else if (codec_id == AV_CODEC_ID_AV1 && track->codec_priv.size) {
2623 /* For now, propagate only the OBUs, if any. Once libavcodec is
2624 updated to handle isobmff style extradata this can be removed. */
2625 extradata_offset = 4;
2627 track->codec_priv.size -= extradata_offset;
2629 if (codec_id == AV_CODEC_ID_NONE)
2630 av_log(matroska->ctx, AV_LOG_INFO,
2631 "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
2633 if (track->time_scale < 0.01)
2634 track->time_scale = 1.0;
2635 avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
2636 1000 * 1000 * 1000); /* 64 bit pts in ns */
2638 /* convert the delay from ns to the track timebase */
2639 track->codec_delay_in_track_tb = av_rescale_q(track->codec_delay,
2640 (AVRational){ 1, 1000000000 },
2643 st->codecpar->codec_id = codec_id;
2645 if (strcmp(track->language, "und"))
2646 av_dict_set(&st->metadata, "language", track->language, 0);
2647 av_dict_set(&st->metadata, "title", track->name, 0);
2649 if (track->flag_default)
2650 st->disposition |= AV_DISPOSITION_DEFAULT;
2651 if (track->flag_forced)
2652 st->disposition |= AV_DISPOSITION_FORCED;
2654 if (!st->codecpar->extradata) {
2656 st->codecpar->extradata = extradata;
2657 st->codecpar->extradata_size = extradata_size;
2658 } else if (track->codec_priv.data && track->codec_priv.size > 0) {
2659 if (ff_alloc_extradata(st->codecpar, track->codec_priv.size))
2660 return AVERROR(ENOMEM);
2661 memcpy(st->codecpar->extradata,
2662 track->codec_priv.data + extradata_offset,
2663 track->codec_priv.size);
2667 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2668 MatroskaTrackPlane *planes = track->operation.combine_planes.elem;
2669 int display_width_mul = 1;
2670 int display_height_mul = 1;
2672 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
2673 st->codecpar->codec_tag = fourcc;
2675 st->codecpar->bits_per_coded_sample = bit_depth;
2676 st->codecpar->width = track->video.pixel_width;
2677 st->codecpar->height = track->video.pixel_height;
2679 if (track->video.interlaced == MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED)
2680 st->codecpar->field_order = mkv_field_order(matroska, track->video.field_order);
2681 else if (track->video.interlaced == MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE)
2682 st->codecpar->field_order = AV_FIELD_PROGRESSIVE;
2684 if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
2685 mkv_stereo_mode_display_mul(track->video.stereo_mode, &display_width_mul, &display_height_mul);
2687 if (track->video.display_unit < MATROSKA_VIDEO_DISPLAYUNIT_UNKNOWN) {
2688 av_reduce(&st->sample_aspect_ratio.num,
2689 &st->sample_aspect_ratio.den,
2690 st->codecpar->height * track->video.display_width * display_width_mul,
2691 st->codecpar->width * track->video.display_height * display_height_mul,
2694 if (st->codecpar->codec_id != AV_CODEC_ID_HEVC)
2695 st->need_parsing = AVSTREAM_PARSE_HEADERS;
2697 if (track->default_duration) {
2698 av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
2699 1000000000, track->default_duration, 30000);
2700 #if FF_API_R_FRAME_RATE
2701 if ( st->avg_frame_rate.num < st->avg_frame_rate.den * 1000LL
2702 && st->avg_frame_rate.num > st->avg_frame_rate.den * 5LL)
2703 st->r_frame_rate = st->avg_frame_rate;
2707 /* export stereo mode flag as metadata tag */
2708 if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
2709 av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
2711 /* export alpha mode flag as metadata tag */
2712 if (track->video.alpha_mode)
2713 av_dict_set(&st->metadata, "alpha_mode", "1", 0);
2715 /* if we have virtual track, mark the real tracks */
2716 for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
2718 if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
2720 snprintf(buf, sizeof(buf), "%s_%d",
2721 ff_matroska_video_stereo_plane[planes[j].type], i);
2722 for (k=0; k < matroska->tracks.nb_elem; k++)
2723 if (planes[j].uid == tracks[k].uid && tracks[k].stream) {
2724 av_dict_set(&tracks[k].stream->metadata,
2725 "stereo_mode", buf, 0);
2729 // add stream level stereo3d side data if it is a supported format
2730 if (track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
2731 track->video.stereo_mode != 10 && track->video.stereo_mode != 12) {
2732 int ret = ff_mkv_stereo3d_conv(st, track->video.stereo_mode);
2737 ret = mkv_parse_video_color(st, track);
2740 ret = mkv_parse_video_projection(st, track);
2743 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2744 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
2745 st->codecpar->codec_tag = fourcc;
2746 st->codecpar->sample_rate = track->audio.out_samplerate;
2747 st->codecpar->channels = track->audio.channels;
2748 if (!st->codecpar->bits_per_coded_sample)
2749 st->codecpar->bits_per_coded_sample = track->audio.bitdepth;
2750 if (st->codecpar->codec_id == AV_CODEC_ID_MP3 ||
2751 st->codecpar->codec_id == AV_CODEC_ID_MLP ||
2752 st->codecpar->codec_id == AV_CODEC_ID_TRUEHD)
2753 st->need_parsing = AVSTREAM_PARSE_FULL;
2754 else if (st->codecpar->codec_id != AV_CODEC_ID_AAC)
2755 st->need_parsing = AVSTREAM_PARSE_HEADERS;
2756 if (track->codec_delay > 0) {
2757 st->codecpar->initial_padding = av_rescale_q(track->codec_delay,
2758 (AVRational){1, 1000000000},
2759 (AVRational){1, st->codecpar->codec_id == AV_CODEC_ID_OPUS ?
2760 48000 : st->codecpar->sample_rate});
2762 if (track->seek_preroll > 0) {
2763 st->codecpar->seek_preroll = av_rescale_q(track->seek_preroll,
2764 (AVRational){1, 1000000000},
2765 (AVRational){1, st->codecpar->sample_rate});
2767 } else if (codec_id == AV_CODEC_ID_WEBVTT) {
2768 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
2770 if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
2771 st->disposition |= AV_DISPOSITION_CAPTIONS;
2772 } else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
2773 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2774 } else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
2775 st->disposition |= AV_DISPOSITION_METADATA;
2777 } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2778 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
2785 static int matroska_read_header(AVFormatContext *s)
2787 MatroskaDemuxContext *matroska = s->priv_data;
2788 EbmlList *attachments_list = &matroska->attachments;
2789 EbmlList *chapters_list = &matroska->chapters;
2790 MatroskaAttachment *attachments;
2791 MatroskaChapter *chapters;
2792 uint64_t max_start = 0;
2798 matroska->cues_parsing_deferred = 1;
2800 /* First read the EBML header. */
2801 if (ebml_parse(matroska, ebml_syntax, &ebml) || !ebml.doctype) {
2802 av_log(matroska->ctx, AV_LOG_ERROR, "EBML header parsing failed\n");
2803 ebml_free(ebml_syntax, &ebml);
2804 return AVERROR_INVALIDDATA;
2806 if (ebml.version > EBML_VERSION ||
2807 ebml.max_size > sizeof(uint64_t) ||
2808 ebml.id_length > sizeof(uint32_t) ||
2809 ebml.doctype_version > 3) {
2810 avpriv_report_missing_feature(matroska->ctx,
2811 "EBML version %"PRIu64", doctype %s, doc version %"PRIu64,
2812 ebml.version, ebml.doctype, ebml.doctype_version);
2813 ebml_free(ebml_syntax, &ebml);
2814 return AVERROR_PATCHWELCOME;
2815 } else if (ebml.doctype_version == 3) {
2816 av_log(matroska->ctx, AV_LOG_WARNING,
2817 "EBML header using unsupported features\n"
2818 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2819 ebml.version, ebml.doctype, ebml.doctype_version);
2821 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
2822 if (!strcmp(ebml.doctype, matroska_doctypes[i]))
2824 if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
2825 av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
2826 if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
2827 ebml_free(ebml_syntax, &ebml);
2828 return AVERROR_INVALIDDATA;
2831 ebml_free(ebml_syntax, &ebml);
2833 /* The next thing is a segment. */
2834 pos = avio_tell(matroska->ctx->pb);
2835 res = ebml_parse(matroska, matroska_segments, matroska);
2836 // Try resyncing until we find an EBML_STOP type element.
2838 res = matroska_resync(matroska, pos);
2841 pos = avio_tell(matroska->ctx->pb);
2842 res = ebml_parse(matroska, matroska_segment, matroska);
2844 /* Set data_offset as it might be needed later by seek_frame_generic. */
2845 if (matroska->current_id == MATROSKA_ID_CLUSTER)
2846 s->internal->data_offset = avio_tell(matroska->ctx->pb) - 4;
2847 matroska_execute_seekhead(matroska);
2849 if (!matroska->time_scale)
2850 matroska->time_scale = 1000000;
2851 if (matroska->duration)
2852 matroska->ctx->duration = matroska->duration * matroska->time_scale *
2853 1000 / AV_TIME_BASE;
2854 av_dict_set(&s->metadata, "title", matroska->title, 0);
2855 av_dict_set(&s->metadata, "encoder", matroska->muxingapp, 0);
2857 if (matroska->date_utc.size == 8)
2858 matroska_metadata_creation_time(&s->metadata, AV_RB64(matroska->date_utc.data));
2860 res = matroska_parse_tracks(s);
2864 attachments = attachments_list->elem;
2865 for (j = 0; j < attachments_list->nb_elem; j++) {
2866 if (!(attachments[j].filename && attachments[j].mime &&
2867 attachments[j].bin.data && attachments[j].bin.size > 0)) {
2868 av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
2870 AVStream *st = avformat_new_stream(s, NULL);
2873 av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
2874 av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
2875 st->codecpar->codec_id = AV_CODEC_ID_NONE;
2877 for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2878 if (!strncmp(ff_mkv_image_mime_tags[i].str, attachments[j].mime,
2879 strlen(ff_mkv_image_mime_tags[i].str))) {
2880 st->codecpar->codec_id = ff_mkv_image_mime_tags[i].id;
2885 attachments[j].stream = st;
2887 if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
2888 AVPacket *pkt = &st->attached_pic;
2890 st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
2891 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
2893 av_init_packet(pkt);
2894 pkt->buf = av_buffer_ref(attachments[j].bin.buf);
2896 return AVERROR(ENOMEM);
2897 pkt->data = attachments[j].bin.data;
2898 pkt->size = attachments[j].bin.size;
2899 pkt->stream_index = st->index;
2900 pkt->flags |= AV_PKT_FLAG_KEY;
2902 st->codecpar->codec_type = AVMEDIA_TYPE_ATTACHMENT;
2903 if (ff_alloc_extradata(st->codecpar, attachments[j].bin.size))
2905 memcpy(st->codecpar->extradata, attachments[j].bin.data,
2906 attachments[j].bin.size);
2908 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2909 if (!strncmp(ff_mkv_mime_tags[i].str, attachments[j].mime,
2910 strlen(ff_mkv_mime_tags[i].str))) {
2911 st->codecpar->codec_id = ff_mkv_mime_tags[i].id;
2919 chapters = chapters_list->elem;
2920 for (i = 0; i < chapters_list->nb_elem; i++)
2921 if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid &&
2922 (max_start == 0 || chapters[i].start > max_start)) {
2923 chapters[i].chapter =
2924 avpriv_new_chapter(s, chapters[i].uid,
2925 (AVRational) { 1, 1000000000 },
2926 chapters[i].start, chapters[i].end,
2928 if (chapters[i].chapter) {
2929 av_dict_set(&chapters[i].chapter->metadata,
2930 "title", chapters[i].title, 0);
2932 max_start = chapters[i].start;
2935 matroska_add_index_entries(matroska);
2937 matroska_convert_tags(s);
2941 matroska_read_close(s);
2946 * Put one packet in an application-supplied AVPacket struct.
2947 * Returns 0 on success or -1 on failure.
2949 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
2952 if (matroska->queue) {
2953 MatroskaTrack *tracks = matroska->tracks.elem;
2954 MatroskaTrack *track;
2956 ff_packet_list_get(&matroska->queue, &matroska->queue_end, pkt);
2957 track = &tracks[pkt->stream_index];
2958 if (track->has_palette) {
2959 uint8_t *pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
2961 av_log(matroska->ctx, AV_LOG_ERROR, "Cannot append palette to packet\n");
2963 memcpy(pal, track->palette, AVPALETTE_SIZE);
2965 track->has_palette = 0;
2974 * Free all packets in our internal queue.
2976 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
2978 ff_packet_list_free(&matroska->queue, &matroska->queue_end);
2981 static int matroska_parse_laces(MatroskaDemuxContext *matroska, uint8_t **buf,
2982 int size, int type, AVIOContext *pb,
2983 uint32_t lace_size[256], int *laces)
2986 uint8_t *data = *buf;
2990 lace_size[0] = size;
2994 av_assert0(size > 0);
3000 case 0x1: /* Xiph lacing */
3004 for (n = 0; n < *laces - 1; n++) {
3008 if (size <= total) {
3009 return AVERROR_INVALIDDATA;
3013 lace_size[n] += temp;
3020 if (size <= total) {
3021 return AVERROR_INVALIDDATA;
3024 lace_size[n] = size - total;
3028 case 0x2: /* fixed-size lacing */
3029 if (size % (*laces)) {
3030 return AVERROR_INVALIDDATA;
3032 for (n = 0; n < *laces; n++)
3033 lace_size[n] = size / *laces;
3036 case 0x3: /* EBML lacing */
3044 n = ebml_read_num(matroska, pb, 8, &num, 1);
3048 return AVERROR_INVALIDDATA;
3050 total = lace_size[0] = num;
3052 for (n = 1; n < *laces - 1; n++) {
3055 r = matroska_ebmlnum_sint(matroska, pb, &snum);
3058 if (lace_size[n - 1] + snum > (uint64_t)INT_MAX)
3059 return AVERROR_INVALIDDATA;
3061 lace_size[n] = lace_size[n - 1] + snum;
3062 total += lace_size[n];
3067 if (size <= total) {
3068 return AVERROR_INVALIDDATA;
3070 lace_size[*laces - 1] = size - total;
3080 static int matroska_parse_rm_audio(MatroskaDemuxContext *matroska,
3081 MatroskaTrack *track, AVStream *st,
3082 uint8_t *data, int size, uint64_t timecode,
3085 int a = st->codecpar->block_align;
3086 int sps = track->audio.sub_packet_size;
3087 int cfs = track->audio.coded_framesize;
3088 int h = track->audio.sub_packet_h;
3089 int y = track->audio.sub_packet_cnt;
3090 int w = track->audio.frame_size;
3093 if (!track->audio.pkt_cnt) {
3094 if (track->audio.sub_packet_cnt == 0)
3095 track->audio.buf_timecode = timecode;
3096 if (st->codecpar->codec_id == AV_CODEC_ID_RA_288) {
3097 if (size < cfs * h / 2) {
3098 av_log(matroska->ctx, AV_LOG_ERROR,
3099 "Corrupt int4 RM-style audio packet size\n");
3100 return AVERROR_INVALIDDATA;
3102 for (x = 0; x < h / 2; x++)
3103 memcpy(track->audio.buf + x * 2 * w + y * cfs,
3104 data + x * cfs, cfs);
3105 } else if (st->codecpar->codec_id == AV_CODEC_ID_SIPR) {
3107 av_log(matroska->ctx, AV_LOG_ERROR,
3108 "Corrupt sipr RM-style audio packet size\n");
3109 return AVERROR_INVALIDDATA;
3111 memcpy(track->audio.buf + y * w, data, w);
3113 if (size < sps * w / sps || h<=0 || w%sps) {
3114 av_log(matroska->ctx, AV_LOG_ERROR,
3115 "Corrupt generic RM-style audio packet size\n");
3116 return AVERROR_INVALIDDATA;
3118 for (x = 0; x < w / sps; x++)
3119 memcpy(track->audio.buf +
3120 sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)),
3121 data + x * sps, sps);
3124 if (++track->audio.sub_packet_cnt >= h) {
3125 if (st->codecpar->codec_id == AV_CODEC_ID_SIPR)
3126 ff_rm_reorder_sipr_data(track->audio.buf, h, w);
3127 track->audio.sub_packet_cnt = 0;
3128 track->audio.pkt_cnt = h * w / a;
3132 while (track->audio.pkt_cnt) {
3134 AVPacket pktl, *pkt = &pktl;
3136 ret = av_new_packet(pkt, a);
3141 track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--),
3143 pkt->pts = track->audio.buf_timecode;
3144 track->audio.buf_timecode = AV_NOPTS_VALUE;
3146 pkt->stream_index = st->index;
3147 ret = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3149 av_packet_unref(pkt);
3150 return AVERROR(ENOMEM);
3157 /* reconstruct full wavpack blocks from mangled matroska ones */
3158 static int matroska_parse_wavpack(MatroskaTrack *track, uint8_t *src,
3159 uint8_t **pdst, int *size)
3161 uint8_t *dst = NULL;
3166 int ret, offset = 0;
3168 if (srclen < 12 || track->stream->codecpar->extradata_size < 2)
3169 return AVERROR_INVALIDDATA;
3171 ver = AV_RL16(track->stream->codecpar->extradata);
3173 samples = AV_RL32(src);
3177 while (srclen >= 8) {
3182 uint32_t flags = AV_RL32(src);
3183 uint32_t crc = AV_RL32(src + 4);
3187 multiblock = (flags & 0x1800) != 0x1800;
3190 ret = AVERROR_INVALIDDATA;
3193 blocksize = AV_RL32(src);
3199 if (blocksize > srclen) {
3200 ret = AVERROR_INVALIDDATA;
3204 tmp = av_realloc(dst, dstlen + blocksize + 32 + AV_INPUT_BUFFER_PADDING_SIZE);
3206 ret = AVERROR(ENOMEM);
3210 dstlen += blocksize + 32;
3212 AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag
3213 AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8
3214 AV_WL16(dst + offset + 8, ver); // version
3215 AV_WL16(dst + offset + 10, 0); // track/index_no
3216 AV_WL32(dst + offset + 12, 0); // total samples
3217 AV_WL32(dst + offset + 16, 0); // block index
3218 AV_WL32(dst + offset + 20, samples); // number of samples
3219 AV_WL32(dst + offset + 24, flags); // flags
3220 AV_WL32(dst + offset + 28, crc); // crc
3221 memcpy(dst + offset + 32, src, blocksize); // block data
3224 srclen -= blocksize;
3225 offset += blocksize + 32;
3228 memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3240 static int matroska_parse_prores(MatroskaTrack *track, uint8_t *src,
3241 uint8_t **pdst, int *size)
3244 int dstlen = *size + 8;
3246 dst = av_malloc(dstlen + AV_INPUT_BUFFER_PADDING_SIZE);
3248 return AVERROR(ENOMEM);
3250 AV_WB32(dst, dstlen);
3251 AV_WB32(dst + 4, MKBETAG('i', 'c', 'p', 'f'));
3252 memcpy(dst + 8, src, dstlen - 8);
3253 memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3261 static int matroska_parse_webvtt(MatroskaDemuxContext *matroska,
3262 MatroskaTrack *track,
3264 uint8_t *data, int data_len,
3269 AVPacket pktl, *pkt = &pktl;
3270 uint8_t *id, *settings, *text, *buf;
3271 int id_len, settings_len, text_len;
3276 return AVERROR_INVALIDDATA;
3279 q = data + data_len;
3284 if (*p == '\r' || *p == '\n') {
3293 if (p >= q || *p != '\n')
3294 return AVERROR_INVALIDDATA;
3300 if (*p == '\r' || *p == '\n') {
3301 settings_len = p - settings;
3309 if (p >= q || *p != '\n')
3310 return AVERROR_INVALIDDATA;
3315 while (text_len > 0) {
3316 const int len = text_len - 1;
3317 const uint8_t c = p[len];
3318 if (c != '\r' && c != '\n')
3324 return AVERROR_INVALIDDATA;
3326 err = av_new_packet(pkt, text_len);
3331 memcpy(pkt->data, text, text_len);
3334 buf = av_packet_new_side_data(pkt,
3335 AV_PKT_DATA_WEBVTT_IDENTIFIER,
3338 av_packet_unref(pkt);
3339 return AVERROR(ENOMEM);
3341 memcpy(buf, id, id_len);
3344 if (settings_len > 0) {
3345 buf = av_packet_new_side_data(pkt,
3346 AV_PKT_DATA_WEBVTT_SETTINGS,
3349 av_packet_unref(pkt);
3350 return AVERROR(ENOMEM);
3352 memcpy(buf, settings, settings_len);
3355 // Do we need this for subtitles?
3356 // pkt->flags = AV_PKT_FLAG_KEY;
3358 pkt->stream_index = st->index;
3359 pkt->pts = timecode;
3361 // Do we need this for subtitles?
3362 // pkt->dts = timecode;
3364 pkt->duration = duration;
3367 err = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3369 av_packet_unref(pkt);
3370 return AVERROR(ENOMEM);
3376 static int matroska_parse_frame(MatroskaDemuxContext *matroska,
3377 MatroskaTrack *track, AVStream *st,
3378 AVBufferRef *buf, uint8_t *data, int pkt_size,
3379 uint64_t timecode, uint64_t lace_duration,
3380 int64_t pos, int is_keyframe,
3381 uint8_t *additional, uint64_t additional_id, int additional_size,
3382 int64_t discard_padding)
3384 MatroskaTrackEncoding *encodings = track->encodings.elem;
3385 uint8_t *pkt_data = data;
3387 AVPacket pktl, *pkt = &pktl;
3389 if (encodings && !encodings->type && encodings->scope & 1) {
3390 res = matroska_decode_buffer(&pkt_data, &pkt_size, track);
3395 if (st->codecpar->codec_id == AV_CODEC_ID_WAVPACK) {
3397 res = matroska_parse_wavpack(track, pkt_data, &wv_data, &pkt_size);
3399 av_log(matroska->ctx, AV_LOG_ERROR,
3400 "Error parsing a wavpack block.\n");
3403 if (pkt_data != data)
3404 av_freep(&pkt_data);
3408 if (st->codecpar->codec_id == AV_CODEC_ID_PRORES &&
3409 AV_RB32(pkt_data + 4) != MKBETAG('i', 'c', 'p', 'f')) {
3411 res = matroska_parse_prores(track, pkt_data, &pr_data, &pkt_size);
3413 av_log(matroska->ctx, AV_LOG_ERROR,
3414 "Error parsing a prores block.\n");
3417 if (pkt_data != data)
3418 av_freep(&pkt_data);
3422 av_init_packet(pkt);
3423 if (pkt_data != data)
3424 pkt->buf = av_buffer_create(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE,
3427 pkt->buf = av_buffer_ref(buf);
3430 res = AVERROR(ENOMEM);
3434 pkt->data = pkt_data;
3435 pkt->size = pkt_size;
3436 pkt->flags = is_keyframe;
3437 pkt->stream_index = st->index;
3439 if (additional_size > 0) {
3440 uint8_t *side_data = av_packet_new_side_data(pkt,
3441 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
3442 additional_size + 8);
3444 av_packet_unref(pkt);
3445 return AVERROR(ENOMEM);
3447 AV_WB64(side_data, additional_id);
3448 memcpy(side_data + 8, additional, additional_size);
3451 if (discard_padding) {
3452 uint8_t *side_data = av_packet_new_side_data(pkt,
3453 AV_PKT_DATA_SKIP_SAMPLES,
3456 av_packet_unref(pkt);
3457 return AVERROR(ENOMEM);
3459 discard_padding = av_rescale_q(discard_padding,
3460 (AVRational){1, 1000000000},
3461 (AVRational){1, st->codecpar->sample_rate});
3462 if (discard_padding > 0) {
3463 AV_WL32(side_data + 4, discard_padding);
3465 AV_WL32(side_data, -discard_padding);
3469 if (track->ms_compat)
3470 pkt->dts = timecode;
3472 pkt->pts = timecode;
3474 pkt->duration = lace_duration;
3476 #if FF_API_CONVERGENCE_DURATION
3477 FF_DISABLE_DEPRECATION_WARNINGS
3478 if (st->codecpar->codec_id == AV_CODEC_ID_SUBRIP) {
3479 pkt->convergence_duration = lace_duration;
3481 FF_ENABLE_DEPRECATION_WARNINGS
3484 res = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3486 av_packet_unref(pkt);
3487 return AVERROR(ENOMEM);
3493 if (pkt_data != data)
3494 av_freep(&pkt_data);
3498 static int matroska_parse_block(MatroskaDemuxContext *matroska, AVBufferRef *buf, uint8_t *data,
3499 int size, int64_t pos, uint64_t cluster_time,
3500 uint64_t block_duration, int is_keyframe,
3501 uint8_t *additional, uint64_t additional_id, int additional_size,
3502 int64_t cluster_pos, int64_t discard_padding)
3504 uint64_t timecode = AV_NOPTS_VALUE;
3505 MatroskaTrack *track;
3510 uint32_t lace_size[256];
3511 int n, flags, laces = 0;
3513 int trust_default_duration = 1;
3515 ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
3517 if ((n = ebml_read_num(matroska, &pb, 8, &num, 1)) < 0)
3522 track = matroska_find_track_by_num(matroska, num);
3523 if (!track || !track->stream) {
3524 av_log(matroska->ctx, AV_LOG_INFO,
3525 "Invalid stream %"PRIu64"\n", num);
3526 return AVERROR_INVALIDDATA;
3527 } else if (size <= 3)
3530 if (st->discard >= AVDISCARD_ALL)
3532 av_assert1(block_duration != AV_NOPTS_VALUE);
3534 block_time = sign_extend(AV_RB16(data), 16);
3538 if (is_keyframe == -1)
3539 is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
3541 if (cluster_time != (uint64_t) -1 &&
3542 (block_time >= 0 || cluster_time >= -block_time)) {
3543 timecode = cluster_time + block_time - track->codec_delay_in_track_tb;
3544 if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
3545 timecode < track->end_timecode)
3546 is_keyframe = 0; /* overlapping subtitles are not key frame */
3548 ff_reduce_index(matroska->ctx, st->index);
3549 av_add_index_entry(st, cluster_pos, timecode, 0, 0,
3554 if (matroska->skip_to_keyframe &&
3555 track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
3556 // Compare signed timecodes. Timecode may be negative due to codec delay
3557 // offset. We don't support timestamps greater than int64_t anyway - see
3559 if ((int64_t)timecode < (int64_t)matroska->skip_to_timecode)
3562 matroska->skip_to_keyframe = 0;
3563 else if (!st->skip_to_keyframe) {
3564 av_log(matroska->ctx, AV_LOG_ERROR, "File is broken, keyframes not correctly marked!\n");
3565 matroska->skip_to_keyframe = 0;
3569 res = matroska_parse_laces(matroska, &data, size, (flags & 0x06) >> 1,
3570 &pb, lace_size, &laces);
3572 av_log(matroska->ctx, AV_LOG_ERROR, "Error parsing frame sizes.\n");
3576 if (track->audio.samplerate == 8000) {
3577 // If this is needed for more codecs, then add them here
3578 if (st->codecpar->codec_id == AV_CODEC_ID_AC3) {
3579 if (track->audio.samplerate != st->codecpar->sample_rate || !st->codecpar->frame_size)
3580 trust_default_duration = 0;
3584 if (!block_duration && trust_default_duration)
3585 block_duration = track->default_duration * laces / matroska->time_scale;
3587 if (cluster_time != (uint64_t)-1 && (block_time >= 0 || cluster_time >= -block_time))
3588 track->end_timecode =
3589 FFMAX(track->end_timecode, timecode + block_duration);
3591 for (n = 0; n < laces; n++) {
3592 int64_t lace_duration = block_duration*(n+1) / laces - block_duration*n / laces;
3594 if ((st->codecpar->codec_id == AV_CODEC_ID_RA_288 ||
3595 st->codecpar->codec_id == AV_CODEC_ID_COOK ||
3596 st->codecpar->codec_id == AV_CODEC_ID_SIPR ||
3597 st->codecpar->codec_id == AV_CODEC_ID_ATRAC3) &&
3598 st->codecpar->block_align && track->audio.sub_packet_size) {
3599 res = matroska_parse_rm_audio(matroska, track, st, data,
3605 } else if (st->codecpar->codec_id == AV_CODEC_ID_WEBVTT) {
3606 res = matroska_parse_webvtt(matroska, track, st,
3608 timecode, lace_duration,
3613 res = matroska_parse_frame(matroska, track, st, buf, data, lace_size[n],
3614 timecode, lace_duration, pos,
3615 !n ? is_keyframe : 0,
3616 additional, additional_id, additional_size,
3622 if (timecode != AV_NOPTS_VALUE)
3623 timecode = lace_duration ? timecode + lace_duration : AV_NOPTS_VALUE;
3624 data += lace_size[n];
3630 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
3632 MatroskaCluster *cluster = &matroska->current_cluster;
3633 MatroskaBlock *block = &cluster->block;
3636 av_assert0(matroska->num_levels <= 2);
3638 if (matroska->num_levels == 1) {
3639 res = ebml_parse(matroska, matroska_segment, NULL);
3642 /* Found a cluster: subtract the size of the ID already read. */
3643 cluster->pos = avio_tell(matroska->ctx->pb) - 4;
3645 res = ebml_parse(matroska, matroska_cluster_enter, cluster);
3651 if (matroska->num_levels == 2) {
3652 /* We are inside a cluster. */
3653 res = ebml_parse(matroska, matroska_cluster_parsing, cluster);
3655 if (res >= 0 && block->bin.size > 0) {
3656 int is_keyframe = block->non_simple ? block->reference == INT64_MIN : -1;
3657 uint8_t* additional = block->additional.size > 0 ?
3658 block->additional.data : NULL;
3660 res = matroska_parse_block(matroska, block->bin.buf, block->bin.data,
3661 block->bin.size, block->bin.pos,
3662 cluster->timecode, block->duration,
3663 is_keyframe, additional, block->additional_id,
3664 block->additional.size, cluster->pos,
3665 block->discard_padding);
3668 ebml_free(matroska_blockgroup, block);
3669 memset(block, 0, sizeof(*block));
3670 } else if (!matroska->num_levels) {
3671 if (!avio_feof(matroska->ctx->pb)) {
3672 avio_r8(matroska->ctx->pb);
3673 if (!avio_feof(matroska->ctx->pb)) {
3674 av_log(matroska->ctx, AV_LOG_WARNING, "File extends beyond "
3675 "end of segment.\n");
3676 return AVERROR_INVALIDDATA;
3686 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
3688 MatroskaDemuxContext *matroska = s->priv_data;
3691 if (matroska->resync_pos == -1) {
3692 // This can only happen if generic seeking has been used.
3693 matroska->resync_pos = avio_tell(s->pb);
3696 while (matroska_deliver_packet(matroska, pkt)) {
3698 return (ret < 0) ? ret : AVERROR_EOF;
3699 if (matroska_parse_cluster(matroska) < 0 && !matroska->done)
3700 ret = matroska_resync(matroska, matroska->resync_pos);
3706 static int matroska_read_seek(AVFormatContext *s, int stream_index,
3707 int64_t timestamp, int flags)
3709 MatroskaDemuxContext *matroska = s->priv_data;
3710 MatroskaTrack *tracks = NULL;
3711 AVStream *st = s->streams[stream_index];
3714 /* Parse the CUES now since we need the index data to seek. */
3715 if (matroska->cues_parsing_deferred > 0) {
3716 matroska->cues_parsing_deferred = 0;
3717 matroska_parse_cues(matroska);
3720 if (!st->nb_index_entries)
3722 timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
3724 if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3725 matroska_reset_status(matroska, 0, st->index_entries[st->nb_index_entries - 1].pos);
3726 while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3727 matroska_clear_queue(matroska);
3728 if (matroska_parse_cluster(matroska) < 0)
3733 matroska_clear_queue(matroska);
3734 if (index < 0 || (matroska->cues_parsing_deferred < 0 && index == st->nb_index_entries - 1))
3737 tracks = matroska->tracks.elem;
3738 for (i = 0; i < matroska->tracks.nb_elem; i++) {
3739 tracks[i].audio.pkt_cnt = 0;
3740 tracks[i].audio.sub_packet_cnt = 0;
3741 tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
3742 tracks[i].end_timecode = 0;
3745 /* We seek to a level 1 element, so set the appropriate status. */
3746 matroska_reset_status(matroska, 0, st->index_entries[index].pos);
3747 if (flags & AVSEEK_FLAG_ANY) {
3748 st->skip_to_keyframe = 0;
3749 matroska->skip_to_timecode = timestamp;
3751 st->skip_to_keyframe = 1;
3752 matroska->skip_to_timecode = st->index_entries[index].timestamp;
3754 matroska->skip_to_keyframe = 1;
3756 ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
3759 // slightly hackish but allows proper fallback to
3760 // the generic seeking code.
3761 matroska_reset_status(matroska, 0, -1);
3762 matroska->resync_pos = -1;
3763 matroska_clear_queue(matroska);
3764 st->skip_to_keyframe =
3765 matroska->skip_to_keyframe = 0;
3770 static int matroska_read_close(AVFormatContext *s)
3772 MatroskaDemuxContext *matroska = s->priv_data;
3773 MatroskaTrack *tracks = matroska->tracks.elem;
3776 matroska_clear_queue(matroska);
3778 for (n = 0; n < matroska->tracks.nb_elem; n++)
3779 if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
3780 av_freep(&tracks[n].audio.buf);
3781 ebml_free(matroska_segment, matroska);
3787 int64_t start_time_ns;
3788 int64_t end_time_ns;
3789 int64_t start_offset;
3793 /* This function searches all the Cues and returns the CueDesc corresponding to
3794 * the timestamp ts. Returned CueDesc will be such that start_time_ns <= ts <
3795 * end_time_ns. All 4 fields will be set to -1 if ts >= file's duration.
3797 static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start) {
3798 MatroskaDemuxContext *matroska = s->priv_data;
3801 int nb_index_entries = s->streams[0]->nb_index_entries;
3802 AVIndexEntry *index_entries = s->streams[0]->index_entries;
3803 if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
3804 for (i = 1; i < nb_index_entries; i++) {
3805 if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
3806 index_entries[i].timestamp * matroska->time_scale > ts) {
3811 cue_desc.start_time_ns = index_entries[i].timestamp * matroska->time_scale;
3812 cue_desc.start_offset = index_entries[i].pos - matroska->segment_start;
3813 if (i != nb_index_entries - 1) {
3814 cue_desc.end_time_ns = index_entries[i + 1].timestamp * matroska->time_scale;
3815 cue_desc.end_offset = index_entries[i + 1].pos - matroska->segment_start;
3817 cue_desc.end_time_ns = matroska->duration * matroska->time_scale;
3818 // FIXME: this needs special handling for files where Cues appear
3819 // before Clusters. the current logic assumes Cues appear after
3821 cue_desc.end_offset = cues_start - matroska->segment_start;
3826 static int webm_clusters_start_with_keyframe(AVFormatContext *s)
3828 MatroskaDemuxContext *matroska = s->priv_data;
3829 uint32_t id = matroska->current_id;
3830 int64_t cluster_pos, before_pos;
3832 if (s->streams[0]->nb_index_entries <= 0) return 0;
3833 // seek to the first cluster using cues.
3834 index = av_index_search_timestamp(s->streams[0], 0, 0);
3835 if (index < 0) return 0;
3836 cluster_pos = s->streams[0]->index_entries[index].pos;
3837 before_pos = avio_tell(s->pb);
3839 uint64_t cluster_id, cluster_length;
3842 avio_seek(s->pb, cluster_pos, SEEK_SET);
3843 // read cluster id and length
3844 read = ebml_read_num(matroska, matroska->ctx->pb, 4, &cluster_id, 1);
3845 if (read < 0 || cluster_id != 0xF43B675) // done with all clusters
3847 read = ebml_read_length(matroska, matroska->ctx->pb, &cluster_length);
3851 matroska_reset_status(matroska, 0, cluster_pos);
3852 matroska_clear_queue(matroska);
3853 if (matroska_parse_cluster(matroska) < 0 ||
3857 pkt = &matroska->queue->pkt;
3858 // 4 + read is the length of the cluster id and the cluster length field.
3859 cluster_pos += 4 + read + cluster_length;
3860 if (!(pkt->flags & AV_PKT_FLAG_KEY)) {
3866 /* Restore the status after matroska_read_header: */
3867 matroska_reset_status(matroska, id, before_pos);
3872 static int buffer_size_after_time_downloaded(int64_t time_ns, double search_sec, int64_t bps,
3873 double min_buffer, double* buffer,
3874 double* sec_to_download, AVFormatContext *s,
3877 double nano_seconds_per_second = 1000000000.0;
3878 double time_sec = time_ns / nano_seconds_per_second;
3880 int64_t time_to_search_ns = (int64_t)(search_sec * nano_seconds_per_second);
3881 int64_t end_time_ns = time_ns + time_to_search_ns;
3882 double sec_downloaded = 0.0;
3883 CueDesc desc_curr = get_cue_desc(s, time_ns, cues_start);
3884 if (desc_curr.start_time_ns == -1)
3886 *sec_to_download = 0.0;
3888 // Check for non cue start time.
3889 if (time_ns > desc_curr.start_time_ns) {
3890 int64_t cue_nano = desc_curr.end_time_ns - time_ns;
3891 double percent = (double)(cue_nano) / (desc_curr.end_time_ns - desc_curr.start_time_ns);
3892 double cueBytes = (desc_curr.end_offset - desc_curr.start_offset) * percent;
3893 double timeToDownload = (cueBytes * 8.0) / bps;
3895 sec_downloaded += (cue_nano / nano_seconds_per_second) - timeToDownload;
3896 *sec_to_download += timeToDownload;
3898 // Check if the search ends within the first cue.
3899 if (desc_curr.end_time_ns >= end_time_ns) {
3900 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3901 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3902 sec_downloaded = percent_to_sub * sec_downloaded;
3903 *sec_to_download = percent_to_sub * *sec_to_download;
3906 if ((sec_downloaded + *buffer) <= min_buffer) {
3910 // Get the next Cue.
3911 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3914 while (desc_curr.start_time_ns != -1) {
3915 int64_t desc_bytes = desc_curr.end_offset - desc_curr.start_offset;
3916 int64_t desc_ns = desc_curr.end_time_ns - desc_curr.start_time_ns;
3917 double desc_sec = desc_ns / nano_seconds_per_second;
3918 double bits = (desc_bytes * 8.0);
3919 double time_to_download = bits / bps;
3921 sec_downloaded += desc_sec - time_to_download;
3922 *sec_to_download += time_to_download;
3924 if (desc_curr.end_time_ns >= end_time_ns) {
3925 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3926 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3927 sec_downloaded = percent_to_sub * sec_downloaded;
3928 *sec_to_download = percent_to_sub * *sec_to_download;
3930 if ((sec_downloaded + *buffer) <= min_buffer)
3935 if ((sec_downloaded + *buffer) <= min_buffer) {
3940 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3942 *buffer = *buffer + sec_downloaded;
3946 /* This function computes the bandwidth of the WebM file with the help of
3947 * buffer_size_after_time_downloaded() function. Both of these functions are
3948 * adapted from WebM Tools project and are adapted to work with FFmpeg's
3949 * Matroska parsing mechanism.
3951 * Returns the bandwidth of the file on success; -1 on error.
3953 static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t cues_start)
3955 MatroskaDemuxContext *matroska = s->priv_data;
3956 AVStream *st = s->streams[0];
3957 double bandwidth = 0.0;
3960 for (i = 0; i < st->nb_index_entries; i++) {
3961 int64_t prebuffer_ns = 1000000000;
3962 int64_t time_ns = st->index_entries[i].timestamp * matroska->time_scale;
3963 double nano_seconds_per_second = 1000000000.0;
3964 int64_t prebuffered_ns = time_ns + prebuffer_ns;
3965 double prebuffer_bytes = 0.0;
3966 int64_t temp_prebuffer_ns = prebuffer_ns;
3967 int64_t pre_bytes, pre_ns;
3968 double pre_sec, prebuffer, bits_per_second;
3969 CueDesc desc_beg = get_cue_desc(s, time_ns, cues_start);
3971 // Start with the first Cue.
3972 CueDesc desc_end = desc_beg;
3974 // Figure out how much data we have downloaded for the prebuffer. This will
3975 // be used later to adjust the bits per sample to try.
3976 while (desc_end.start_time_ns != -1 && desc_end.end_time_ns < prebuffered_ns) {
3977 // Prebuffered the entire Cue.
3978 prebuffer_bytes += desc_end.end_offset - desc_end.start_offset;
3979 temp_prebuffer_ns -= desc_end.end_time_ns - desc_end.start_time_ns;
3980 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
3982 if (desc_end.start_time_ns == -1) {
3983 // The prebuffer is larger than the duration.
3984 if (matroska->duration * matroska->time_scale >= prebuffered_ns)
3986 bits_per_second = 0.0;
3988 // The prebuffer ends in the last Cue. Estimate how much data was
3990 pre_bytes = desc_end.end_offset - desc_end.start_offset;
3991 pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
3992 pre_sec = pre_ns / nano_seconds_per_second;
3994 pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec);
3996 prebuffer = prebuffer_ns / nano_seconds_per_second;
3998 // Set this to 0.0 in case our prebuffer buffers the entire video.
3999 bits_per_second = 0.0;
4001 int64_t desc_bytes = desc_end.end_offset - desc_beg.start_offset;
4002 int64_t desc_ns = desc_end.end_time_ns - desc_beg.start_time_ns;
4003 double desc_sec = desc_ns / nano_seconds_per_second;
4004 double calc_bits_per_second = (desc_bytes * 8) / desc_sec;
4006 // Drop the bps by the percentage of bytes buffered.
4007 double percent = (desc_bytes - prebuffer_bytes) / desc_bytes;
4008 double mod_bits_per_second = calc_bits_per_second * percent;
4010 if (prebuffer < desc_sec) {
4012 (double)(matroska->duration * matroska->time_scale) / nano_seconds_per_second;
4014 // Add 1 so the bits per second should be a little bit greater than file
4016 int64_t bps = (int64_t)(mod_bits_per_second) + 1;
4017 const double min_buffer = 0.0;
4018 double buffer = prebuffer;
4019 double sec_to_download = 0.0;
4021 int rv = buffer_size_after_time_downloaded(prebuffered_ns, search_sec, bps,
4022 min_buffer, &buffer, &sec_to_download,
4026 } else if (rv == 0) {
4027 bits_per_second = (double)(bps);
4032 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
4033 } while (desc_end.start_time_ns != -1);
4035 if (bandwidth < bits_per_second) bandwidth = bits_per_second;
4037 return (int64_t)bandwidth;
4040 static int webm_dash_manifest_cues(AVFormatContext *s, int64_t init_range)
4042 MatroskaDemuxContext *matroska = s->priv_data;
4043 EbmlList *seekhead_list = &matroska->seekhead;
4044 MatroskaSeekhead *seekhead = seekhead_list->elem;
4046 int64_t cues_start = -1, cues_end = -1, before_pos, bandwidth;
4050 // determine cues start and end positions
4051 for (i = 0; i < seekhead_list->nb_elem; i++)
4052 if (seekhead[i].id == MATROSKA_ID_CUES)
4055 if (i >= seekhead_list->nb_elem) return -1;
4057 before_pos = avio_tell(matroska->ctx->pb);
4058 cues_start = seekhead[i].pos + matroska->segment_start;
4059 if (avio_seek(matroska->ctx->pb, cues_start, SEEK_SET) == cues_start) {
4060 // cues_end is computed as cues_start + cues_length + length of the
4061 // Cues element ID (i.e. 4) + EBML length of the Cues element.
4062 // cues_end is inclusive and the above sum is reduced by 1.
4063 uint64_t cues_length, cues_id;
4065 bytes_read = ebml_read_num (matroska, matroska->ctx->pb, 4, &cues_id, 1);
4066 if (bytes_read < 0 || cues_id != (MATROSKA_ID_CUES & 0xfffffff))
4067 return bytes_read < 0 ? bytes_read : AVERROR_INVALIDDATA;
4068 bytes_read = ebml_read_length(matroska, matroska->ctx->pb, &cues_length);
4071 cues_end = cues_start + 4 + bytes_read + cues_length - 1;
4073 avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
4074 if (cues_start == -1 || cues_end == -1) return -1;
4077 matroska_parse_cues(matroska);
4080 av_dict_set_int(&s->streams[0]->metadata, CUES_START, cues_start, 0);
4083 av_dict_set_int(&s->streams[0]->metadata, CUES_END, cues_end, 0);
4085 // if the file has cues at the start, fix up the init range so that
4086 // it does not include it
4087 if (cues_start <= init_range)
4088 av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, cues_start - 1, 0);
4091 bandwidth = webm_dash_manifest_compute_bandwidth(s, cues_start);
4092 if (bandwidth < 0) return -1;
4093 av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH, bandwidth, 0);
4095 // check if all clusters start with key frames
4096 av_dict_set_int(&s->streams[0]->metadata, CLUSTER_KEYFRAME, webm_clusters_start_with_keyframe(s), 0);
4098 // store cue point timestamps as a comma separated list for checking subsegment alignment in
4099 // the muxer. assumes that each timestamp cannot be more than 20 characters long.
4100 buf = av_malloc_array(s->streams[0]->nb_index_entries, 20);
4101 if (!buf) return -1;
4103 for (i = 0; i < s->streams[0]->nb_index_entries; i++) {
4104 int ret = snprintf(buf + end, 20,
4105 "%" PRId64"%s", s->streams[0]->index_entries[i].timestamp,
4106 i != s->streams[0]->nb_index_entries - 1 ? "," : "");
4107 if (ret <= 0 || (ret == 20 && i == s->streams[0]->nb_index_entries - 1)) {
4108 av_log(s, AV_LOG_ERROR, "timestamp too long.\n");
4110 return AVERROR_INVALIDDATA;
4114 av_dict_set(&s->streams[0]->metadata, CUE_TIMESTAMPS,
4115 buf, AV_DICT_DONT_STRDUP_VAL);
4120 static int webm_dash_manifest_read_header(AVFormatContext *s)
4123 int ret = matroska_read_header(s);
4125 MatroskaTrack *tracks;
4126 MatroskaDemuxContext *matroska = s->priv_data;
4128 av_log(s, AV_LOG_ERROR, "Failed to read file headers\n");
4131 if (!s->nb_streams) {
4132 matroska_read_close(s);
4133 av_log(s, AV_LOG_ERROR, "No streams found\n");
4134 return AVERROR_INVALIDDATA;
4137 if (!matroska->is_live) {
4138 buf = av_asprintf("%g", matroska->duration);
4139 if (!buf) return AVERROR(ENOMEM);
4140 av_dict_set(&s->streams[0]->metadata, DURATION,
4141 buf, AV_DICT_DONT_STRDUP_VAL);
4143 // initialization range
4144 // 5 is the offset of Cluster ID.
4145 init_range = avio_tell(s->pb) - 5;
4146 av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, init_range, 0);
4149 // basename of the file
4150 buf = strrchr(s->url, '/');
4151 av_dict_set(&s->streams[0]->metadata, FILENAME, buf ? ++buf : s->url, 0);
4154 tracks = matroska->tracks.elem;
4155 av_dict_set_int(&s->streams[0]->metadata, TRACK_NUMBER, tracks[0].num, 0);
4157 // parse the cues and populate Cue related fields
4158 if (!matroska->is_live) {
4159 ret = webm_dash_manifest_cues(s, init_range);
4161 av_log(s, AV_LOG_ERROR, "Error parsing Cues\n");
4166 // use the bandwidth from the command line if it was provided
4167 if (matroska->bandwidth > 0) {
4168 av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH,
4169 matroska->bandwidth, 0);
4174 static int webm_dash_manifest_read_packet(AVFormatContext *s, AVPacket *pkt)
4179 #define OFFSET(x) offsetof(MatroskaDemuxContext, x)
4180 static const AVOption options[] = {
4181 { "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 },
4182 { "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 },
4186 static const AVClass webm_dash_class = {
4187 .class_name = "WebM DASH Manifest demuxer",
4188 .item_name = av_default_item_name,
4190 .version = LIBAVUTIL_VERSION_INT,
4193 AVInputFormat ff_matroska_demuxer = {
4194 .name = "matroska,webm",
4195 .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
4196 .extensions = "mkv,mk3d,mka,mks",
4197 .priv_data_size = sizeof(MatroskaDemuxContext),
4198 .read_probe = matroska_probe,
4199 .read_header = matroska_read_header,
4200 .read_packet = matroska_read_packet,
4201 .read_close = matroska_read_close,
4202 .read_seek = matroska_read_seek,
4203 .mime_type = "audio/webm,audio/x-matroska,video/webm,video/x-matroska"
4206 AVInputFormat ff_webm_dash_manifest_demuxer = {
4207 .name = "webm_dash_manifest",
4208 .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
4209 .priv_data_size = sizeof(MatroskaDemuxContext),
4210 .read_header = webm_dash_manifest_read_header,
4211 .read_packet = webm_dash_manifest_read_packet,
4212 .read_close = matroska_read_close,
4213 .priv_class = &webm_dash_class,