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. */
91 typedef const struct EbmlSyntax {
101 const struct EbmlSyntax *n;
105 typedef struct EbmlList {
110 typedef struct EbmlBin {
117 typedef struct Ebml {
122 uint64_t doctype_version;
125 typedef struct MatroskaTrackCompression {
128 } MatroskaTrackCompression;
130 typedef struct MatroskaTrackEncryption {
133 } MatroskaTrackEncryption;
135 typedef struct MatroskaTrackEncoding {
138 MatroskaTrackCompression compression;
139 MatroskaTrackEncryption encryption;
140 } MatroskaTrackEncoding;
142 typedef struct MatroskaMasteringMeta {
151 double max_luminance;
152 double min_luminance;
153 } MatroskaMasteringMeta;
155 typedef struct MatroskaTrackVideoColor {
156 uint64_t matrix_coefficients;
157 uint64_t bits_per_channel;
158 uint64_t chroma_sub_horz;
159 uint64_t chroma_sub_vert;
160 uint64_t cb_sub_horz;
161 uint64_t cb_sub_vert;
162 uint64_t chroma_siting_horz;
163 uint64_t chroma_siting_vert;
165 uint64_t transfer_characteristics;
169 MatroskaMasteringMeta mastering_meta;
170 } MatroskaTrackVideoColor;
172 typedef struct MatroskaTrackVideoProjection {
178 } MatroskaTrackVideoProjection;
180 typedef struct MatroskaTrackVideo {
182 uint64_t display_width;
183 uint64_t display_height;
184 uint64_t pixel_width;
185 uint64_t pixel_height;
187 uint64_t display_unit;
189 uint64_t field_order;
190 uint64_t stereo_mode;
193 MatroskaTrackVideoProjection projection;
194 } MatroskaTrackVideo;
196 typedef struct MatroskaTrackAudio {
198 double out_samplerate;
202 /* real audio header (extracted from extradata) */
209 uint64_t buf_timecode;
211 } MatroskaTrackAudio;
213 typedef struct MatroskaTrackPlane {
216 } MatroskaTrackPlane;
218 typedef struct MatroskaTrackOperation {
219 EbmlList combine_planes;
220 } MatroskaTrackOperation;
222 typedef struct MatroskaTrack {
231 uint64_t default_duration;
232 uint64_t flag_default;
233 uint64_t flag_forced;
234 uint64_t seek_preroll;
235 MatroskaTrackVideo video;
236 MatroskaTrackAudio audio;
237 MatroskaTrackOperation operation;
239 uint64_t codec_delay;
240 uint64_t codec_delay_in_track_tb;
243 int64_t end_timecode;
245 uint64_t max_block_additional_id;
247 uint32_t palette[AVPALETTE_COUNT];
251 typedef struct MatroskaAttachment {
258 } MatroskaAttachment;
260 typedef struct MatroskaChapter {
269 typedef struct MatroskaIndexPos {
274 typedef struct MatroskaIndex {
279 typedef struct MatroskaTag {
287 typedef struct MatroskaTagTarget {
295 typedef struct MatroskaTags {
296 MatroskaTagTarget target;
300 typedef struct MatroskaSeekhead {
305 typedef struct MatroskaLevel {
310 typedef struct MatroskaBlock {
315 uint64_t additional_id;
317 int64_t discard_padding;
320 typedef struct MatroskaCluster {
326 typedef struct MatroskaLevel1Element {
330 } MatroskaLevel1Element;
332 typedef struct MatroskaDemuxContext {
333 const AVClass *class;
334 AVFormatContext *ctx;
338 MatroskaLevel levels[EBML_MAX_DEPTH];
348 EbmlList attachments;
354 /* byte position of the segment inside the stream */
355 int64_t segment_start;
357 /* the packet queue */
359 AVPacketList *queue_end;
363 /* What to skip before effectively reading a packet. */
364 int skip_to_keyframe;
365 uint64_t skip_to_timecode;
367 /* File has a CUES element, but we defer parsing until it is needed. */
368 int cues_parsing_deferred;
370 /* Level1 elements and whether they were read yet */
371 MatroskaLevel1Element level1_elems[64];
372 int num_level1_elems;
374 MatroskaCluster current_cluster;
376 /* WebM DASH Manifest live flag */
379 /* Bandwidth value for WebM DASH Manifest */
381 } MatroskaDemuxContext;
383 #define CHILD_OF(parent) { .def = { .n = parent } }
385 static const EbmlSyntax ebml_syntax[], matroska_segment[], matroska_track_video_color[], matroska_track_video[],
386 matroska_track[], matroska_track_encoding[], matroska_track_encodings[],
387 matroska_track_combine_planes[], matroska_track_operation[], matroska_tracks[],
388 matroska_attachments[], matroska_chapter_entry[], matroska_chapter[], matroska_chapters[],
389 matroska_index_entry[], matroska_index[], matroska_tag[], matroska_tags[], matroska_seekhead[],
390 matroska_blockadditions[], matroska_blockgroup[], matroska_cluster_parsing[];
392 static const EbmlSyntax ebml_header[] = {
393 { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml, version), { .u = EBML_VERSION } },
394 { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml, max_size), { .u = 8 } },
395 { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml, id_length), { .u = 4 } },
396 { EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml, doctype), { .s = "(none)" } },
397 { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml, doctype_version), { .u = 1 } },
398 { EBML_ID_EBMLVERSION, EBML_NONE },
399 { EBML_ID_DOCTYPEVERSION, EBML_NONE },
400 CHILD_OF(ebml_syntax)
403 static const EbmlSyntax ebml_syntax[] = {
404 { EBML_ID_HEADER, EBML_NEST, 0, 0, { .n = ebml_header } },
405 { MATROSKA_ID_SEGMENT, EBML_STOP },
409 static const EbmlSyntax matroska_info[] = {
410 { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } },
411 { MATROSKA_ID_DURATION, EBML_FLOAT, 0, offsetof(MatroskaDemuxContext, duration) },
412 { MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, title) },
413 { MATROSKA_ID_WRITINGAPP, EBML_NONE },
414 { MATROSKA_ID_MUXINGAPP, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, muxingapp) },
415 { MATROSKA_ID_DATEUTC, EBML_BIN, 0, offsetof(MatroskaDemuxContext, date_utc) },
416 { MATROSKA_ID_SEGMENTUID, EBML_NONE },
417 CHILD_OF(matroska_segment)
420 static const EbmlSyntax matroska_mastering_meta[] = {
421 { MATROSKA_ID_VIDEOCOLOR_RX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, r_x), { .f=-1 } },
422 { MATROSKA_ID_VIDEOCOLOR_RY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, r_y), { .f=-1 } },
423 { MATROSKA_ID_VIDEOCOLOR_GX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, g_x), { .f=-1 } },
424 { MATROSKA_ID_VIDEOCOLOR_GY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, g_y), { .f=-1 } },
425 { MATROSKA_ID_VIDEOCOLOR_BX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, b_x), { .f=-1 } },
426 { MATROSKA_ID_VIDEOCOLOR_BY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, b_y), { .f=-1 } },
427 { MATROSKA_ID_VIDEOCOLOR_WHITEX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, white_x), { .f=-1 } },
428 { MATROSKA_ID_VIDEOCOLOR_WHITEY, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, white_y), { .f=-1 } },
429 { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, min_luminance), { .f=-1 } },
430 { MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX, EBML_FLOAT, 0, offsetof(MatroskaMasteringMeta, max_luminance), { .f=-1 } },
431 CHILD_OF(matroska_track_video_color)
434 static const EbmlSyntax matroska_track_video_color[] = {
435 { MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, matrix_coefficients), { .u = AVCOL_SPC_UNSPECIFIED } },
436 { MATROSKA_ID_VIDEOCOLORBITSPERCHANNEL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, bits_per_channel), { .u=0 } },
437 { MATROSKA_ID_VIDEOCOLORCHROMASUBHORZ, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_horz), { .u=0 } },
438 { MATROSKA_ID_VIDEOCOLORCHROMASUBVERT, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_vert), { .u=0 } },
439 { MATROSKA_ID_VIDEOCOLORCBSUBHORZ, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, cb_sub_horz), { .u=0 } },
440 { MATROSKA_ID_VIDEOCOLORCBSUBVERT, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, cb_sub_vert), { .u=0 } },
441 { MATROSKA_ID_VIDEOCOLORCHROMASITINGHORZ, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_siting_horz), { .u = MATROSKA_COLOUR_CHROMASITINGHORZ_UNDETERMINED } },
442 { MATROSKA_ID_VIDEOCOLORCHROMASITINGVERT, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, chroma_siting_vert), { .u = MATROSKA_COLOUR_CHROMASITINGVERT_UNDETERMINED } },
443 { MATROSKA_ID_VIDEOCOLORRANGE, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, range), { .u = AVCOL_RANGE_UNSPECIFIED } },
444 { MATROSKA_ID_VIDEOCOLORTRANSFERCHARACTERISTICS, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, transfer_characteristics), { .u = AVCOL_TRC_UNSPECIFIED } },
445 { MATROSKA_ID_VIDEOCOLORPRIMARIES, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, primaries), { .u = AVCOL_PRI_UNSPECIFIED } },
446 { MATROSKA_ID_VIDEOCOLORMAXCLL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, max_cll), { .u=0 } },
447 { MATROSKA_ID_VIDEOCOLORMAXFALL, EBML_UINT, 0, offsetof(MatroskaTrackVideoColor, max_fall), { .u=0 } },
448 { MATROSKA_ID_VIDEOCOLORMASTERINGMETA, EBML_NEST, 0, offsetof(MatroskaTrackVideoColor, mastering_meta), { .n = matroska_mastering_meta } },
449 CHILD_OF(matroska_track_video)
452 static const EbmlSyntax matroska_track_video_projection[] = {
453 { MATROSKA_ID_VIDEOPROJECTIONTYPE, EBML_UINT, 0, offsetof(MatroskaTrackVideoProjection, type), { .u = MATROSKA_VIDEO_PROJECTION_TYPE_RECTANGULAR } },
454 { MATROSKA_ID_VIDEOPROJECTIONPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrackVideoProjection, private) },
455 { MATROSKA_ID_VIDEOPROJECTIONPOSEYAW, EBML_FLOAT, 0, offsetof(MatroskaTrackVideoProjection, yaw), { .f=0.0 } },
456 { MATROSKA_ID_VIDEOPROJECTIONPOSEPITCH, EBML_FLOAT, 0, offsetof(MatroskaTrackVideoProjection, pitch), { .f=0.0 } },
457 { MATROSKA_ID_VIDEOPROJECTIONPOSEROLL, EBML_FLOAT, 0, offsetof(MatroskaTrackVideoProjection, roll), { .f=0.0 } },
458 CHILD_OF(matroska_track_video)
461 static const EbmlSyntax matroska_track_video[] = {
462 { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT, 0, offsetof(MatroskaTrackVideo, frame_rate) },
463 { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_width), { .u=-1 } },
464 { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_height), { .u=-1 } },
465 { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_width) },
466 { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_height) },
467 { MATROSKA_ID_VIDEOCOLORSPACE, EBML_BIN, 0, offsetof(MatroskaTrackVideo, color_space) },
468 { MATROSKA_ID_VIDEOALPHAMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, alpha_mode) },
469 { MATROSKA_ID_VIDEOCOLOR, EBML_NEST, sizeof(MatroskaTrackVideoColor), offsetof(MatroskaTrackVideo, color), { .n = matroska_track_video_color } },
470 { MATROSKA_ID_VIDEOPROJECTION, EBML_NEST, 0, offsetof(MatroskaTrackVideo, projection), { .n = matroska_track_video_projection } },
471 { MATROSKA_ID_VIDEOPIXELCROPB, EBML_NONE },
472 { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
473 { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
474 { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
475 { MATROSKA_ID_VIDEODISPLAYUNIT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_unit), { .u= MATROSKA_VIDEO_DISPLAYUNIT_PIXELS } },
476 { MATROSKA_ID_VIDEOFLAGINTERLACED, EBML_UINT, 0, offsetof(MatroskaTrackVideo, interlaced), { .u = MATROSKA_VIDEO_INTERLACE_FLAG_UNDETERMINED } },
477 { MATROSKA_ID_VIDEOFIELDORDER, EBML_UINT, 0, offsetof(MatroskaTrackVideo, field_order), { .u = MATROSKA_VIDEO_FIELDORDER_UNDETERMINED } },
478 { MATROSKA_ID_VIDEOSTEREOMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, stereo_mode), { .u = MATROSKA_VIDEO_STEREOMODE_TYPE_NB } },
479 { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
480 CHILD_OF(matroska_track)
483 static const EbmlSyntax matroska_track_audio[] = {
484 { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } },
485 { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, out_samplerate) },
486 { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio, bitdepth) },
487 { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio, channels), { .u = 1 } },
488 CHILD_OF(matroska_track)
491 static const EbmlSyntax matroska_track_encoding_compression[] = {
492 { MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, offsetof(MatroskaTrackCompression, algo), { .u = 0 } },
493 { MATROSKA_ID_ENCODINGCOMPSETTINGS, EBML_BIN, 0, offsetof(MatroskaTrackCompression, settings) },
494 CHILD_OF(matroska_track_encoding)
497 static const EbmlSyntax matroska_track_encoding_encryption[] = {
498 { MATROSKA_ID_ENCODINGENCALGO, EBML_UINT, 0, offsetof(MatroskaTrackEncryption,algo), {.u = 0} },
499 { MATROSKA_ID_ENCODINGENCKEYID, EBML_BIN, 0, offsetof(MatroskaTrackEncryption,key_id) },
500 { MATROSKA_ID_ENCODINGENCAESSETTINGS, EBML_NONE },
501 { MATROSKA_ID_ENCODINGSIGALGO, EBML_NONE },
502 { MATROSKA_ID_ENCODINGSIGHASHALGO, EBML_NONE },
503 { MATROSKA_ID_ENCODINGSIGKEYID, EBML_NONE },
504 { MATROSKA_ID_ENCODINGSIGNATURE, EBML_NONE },
505 CHILD_OF(matroska_track_encoding)
507 static const EbmlSyntax matroska_track_encoding[] = {
508 { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, scope), { .u = 1 } },
509 { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, type), { .u = 0 } },
510 { MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } },
511 { MATROSKA_ID_ENCODINGENCRYPTION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, encryption), { .n = matroska_track_encoding_encryption } },
512 { MATROSKA_ID_ENCODINGORDER, EBML_NONE },
513 CHILD_OF(matroska_track_encodings)
516 static const EbmlSyntax matroska_track_encodings[] = {
517 { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } },
518 CHILD_OF(matroska_track)
521 static const EbmlSyntax matroska_track_plane[] = {
522 { MATROSKA_ID_TRACKPLANEUID, EBML_UINT, 0, offsetof(MatroskaTrackPlane,uid) },
523 { MATROSKA_ID_TRACKPLANETYPE, EBML_UINT, 0, offsetof(MatroskaTrackPlane,type) },
524 CHILD_OF(matroska_track_combine_planes)
527 static const EbmlSyntax matroska_track_combine_planes[] = {
528 { MATROSKA_ID_TRACKPLANE, EBML_NEST, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n = matroska_track_plane} },
529 CHILD_OF(matroska_track_operation)
532 static const EbmlSyntax matroska_track_operation[] = {
533 { MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, {.n = matroska_track_combine_planes} },
534 CHILD_OF(matroska_track)
537 static const EbmlSyntax matroska_track[] = {
538 { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack, num) },
539 { MATROSKA_ID_TRACKNAME, EBML_UTF8, 0, offsetof(MatroskaTrack, name) },
540 { MATROSKA_ID_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTrack, uid) },
541 { MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, offsetof(MatroskaTrack, type) },
542 { MATROSKA_ID_CODECID, EBML_STR, 0, offsetof(MatroskaTrack, codec_id) },
543 { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack, codec_priv) },
544 { MATROSKA_ID_CODECDELAY, EBML_UINT, 0, offsetof(MatroskaTrack, codec_delay) },
545 { MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack, language), { .s = "eng" } },
546 { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack, default_duration) },
547 { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } },
548 { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack, flag_default), { .u = 1 } },
549 { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } },
550 { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } },
551 { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } },
552 { MATROSKA_ID_TRACKOPERATION, EBML_NEST, 0, offsetof(MatroskaTrack, operation), { .n = matroska_track_operation } },
553 { MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST, 0, 0, { .n = matroska_track_encodings } },
554 { MATROSKA_ID_TRACKMAXBLKADDID, EBML_UINT, 0, offsetof(MatroskaTrack, max_block_additional_id) },
555 { MATROSKA_ID_SEEKPREROLL, EBML_UINT, 0, offsetof(MatroskaTrack, seek_preroll) },
556 { MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE },
557 { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
558 { MATROSKA_ID_CODECNAME, EBML_NONE },
559 { MATROSKA_ID_CODECDECODEALL, EBML_NONE },
560 { MATROSKA_ID_CODECINFOURL, EBML_NONE },
561 { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
562 { MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
563 { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
564 CHILD_OF(matroska_tracks)
567 static const EbmlSyntax matroska_tracks[] = {
568 { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } },
569 CHILD_OF(matroska_segment)
572 static const EbmlSyntax matroska_attachment[] = {
573 { MATROSKA_ID_FILEUID, EBML_UINT, 0, offsetof(MatroskaAttachment, uid) },
574 { MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachment, filename) },
575 { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachment, mime) },
576 { MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachment, bin) },
577 { MATROSKA_ID_FILEDESC, EBML_NONE },
578 CHILD_OF(matroska_attachments)
581 static const EbmlSyntax matroska_attachments[] = {
582 { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } },
583 CHILD_OF(matroska_segment)
586 static const EbmlSyntax matroska_chapter_display[] = {
587 { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter, title) },
588 { MATROSKA_ID_CHAPLANG, EBML_NONE },
589 { MATROSKA_ID_CHAPCOUNTRY, EBML_NONE },
590 CHILD_OF(matroska_chapter_entry)
593 static const EbmlSyntax matroska_chapter_entry[] = {
594 { MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, offsetof(MatroskaChapter, start), { .u = AV_NOPTS_VALUE } },
595 { MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, offsetof(MatroskaChapter, end), { .u = AV_NOPTS_VALUE } },
596 { MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaChapter, uid) },
597 { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, { .n = matroska_chapter_display } },
598 { MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
599 { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
600 { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
601 { MATROSKA_ID_CHAPTERATOM, EBML_NONE },
602 CHILD_OF(matroska_chapter)
605 static const EbmlSyntax matroska_chapter[] = {
606 { MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } },
607 { MATROSKA_ID_EDITIONUID, EBML_NONE },
608 { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
609 { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
610 { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
611 CHILD_OF(matroska_chapters)
614 static const EbmlSyntax matroska_chapters[] = {
615 { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, { .n = matroska_chapter } },
616 CHILD_OF(matroska_segment)
619 static const EbmlSyntax matroska_index_pos[] = {
620 { MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos, track) },
621 { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos, pos) },
622 { MATROSKA_ID_CUERELATIVEPOSITION,EBML_NONE },
623 { MATROSKA_ID_CUEDURATION, EBML_NONE },
624 { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
625 CHILD_OF(matroska_index_entry)
628 static const EbmlSyntax matroska_index_entry[] = {
629 { MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex, time) },
630 { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } },
631 CHILD_OF(matroska_index)
634 static const EbmlSyntax matroska_index[] = {
635 { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } },
636 CHILD_OF(matroska_segment)
639 static const EbmlSyntax matroska_simpletag[] = {
640 { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag, name) },
641 { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag, string) },
642 { MATROSKA_ID_TAGLANG, EBML_STR, 0, offsetof(MatroskaTag, lang), { .s = "und" } },
643 { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTag, def) },
644 { MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0, offsetof(MatroskaTag, def) },
645 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag, sub), { .n = matroska_simpletag } },
646 CHILD_OF(matroska_tag)
649 static const EbmlSyntax matroska_tagtargets[] = {
650 { MATROSKA_ID_TAGTARGETS_TYPE, EBML_STR, 0, offsetof(MatroskaTagTarget, type) },
651 { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } },
652 { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, trackuid) },
653 { MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, chapteruid) },
654 { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, attachuid) },
655 CHILD_OF(matroska_tag)
658 static const EbmlSyntax matroska_tag[] = {
659 { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags, tag), { .n = matroska_simpletag } },
660 { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, offsetof(MatroskaTags, target), { .n = matroska_tagtargets } },
661 CHILD_OF(matroska_tags)
664 static const EbmlSyntax matroska_tags[] = {
665 { MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } },
666 CHILD_OF(matroska_segment)
669 static const EbmlSyntax matroska_seekhead_entry[] = {
670 { MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead, id) },
671 { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } },
672 CHILD_OF(matroska_seekhead)
675 static const EbmlSyntax matroska_seekhead[] = {
676 { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } },
677 CHILD_OF(matroska_segment)
680 static const EbmlSyntax matroska_segment[] = {
681 { MATROSKA_ID_INFO, EBML_LEVEL1, 0, 0, { .n = matroska_info } },
682 { MATROSKA_ID_TRACKS, EBML_LEVEL1, 0, 0, { .n = matroska_tracks } },
683 { MATROSKA_ID_ATTACHMENTS, EBML_LEVEL1, 0, 0, { .n = matroska_attachments } },
684 { MATROSKA_ID_CHAPTERS, EBML_LEVEL1, 0, 0, { .n = matroska_chapters } },
685 { MATROSKA_ID_CUES, EBML_LEVEL1, 0, 0, { .n = matroska_index } },
686 { MATROSKA_ID_TAGS, EBML_LEVEL1, 0, 0, { .n = matroska_tags } },
687 { MATROSKA_ID_SEEKHEAD, EBML_LEVEL1, 0, 0, { .n = matroska_seekhead } },
688 { MATROSKA_ID_CLUSTER, EBML_STOP },
689 { 0 } /* We don't want to go back to level 0, so don't add the parent. */
692 static const EbmlSyntax matroska_segments[] = {
693 { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, { .n = matroska_segment } },
697 static const EbmlSyntax matroska_blockmore[] = {
698 { MATROSKA_ID_BLOCKADDID, EBML_UINT, 0, offsetof(MatroskaBlock,additional_id) },
699 { MATROSKA_ID_BLOCKADDITIONAL, EBML_BIN, 0, offsetof(MatroskaBlock,additional) },
700 CHILD_OF(matroska_blockadditions)
703 static const EbmlSyntax matroska_blockadditions[] = {
704 { MATROSKA_ID_BLOCKMORE, EBML_NEST, 0, 0, {.n = matroska_blockmore} },
705 CHILD_OF(matroska_blockgroup)
708 static const EbmlSyntax matroska_blockgroup[] = {
709 { MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
710 { MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, { .n = matroska_blockadditions} },
711 { MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, offsetof(MatroskaBlock, duration) },
712 { MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, offsetof(MatroskaBlock, discard_padding) },
713 { MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 0, offsetof(MatroskaBlock, reference), { .i = INT64_MIN } },
714 { MATROSKA_ID_CODECSTATE, EBML_NONE },
715 { 1, EBML_UINT, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } },
716 CHILD_OF(matroska_cluster_parsing)
719 static const EbmlSyntax matroska_cluster_parsing[] = {
720 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
721 { MATROSKA_ID_BLOCKGROUP, EBML_NEST, 0, 0, { .n = matroska_blockgroup } },
722 { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) },
723 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
724 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
725 CHILD_OF(matroska_segment)
728 static const EbmlSyntax matroska_cluster_initial[] = {
729 { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) },
730 { MATROSKA_ID_BLOCKGROUP, EBML_STOP },
731 { MATROSKA_ID_SIMPLEBLOCK, EBML_STOP },
732 { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
733 { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
734 CHILD_OF(matroska_segment)
737 static const EbmlSyntax matroska_cluster_enter[] = {
738 { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = matroska_cluster_initial } },
742 static const EbmlSyntax matroska_clusters[] = {
743 { MATROSKA_ID_CLUSTER, EBML_STOP },
744 { MATROSKA_ID_CUES, EBML_NONE },
745 { MATROSKA_ID_TAGS, EBML_NONE },
746 { MATROSKA_ID_INFO, EBML_NONE },
747 { MATROSKA_ID_TRACKS, EBML_NONE },
748 { MATROSKA_ID_ATTACHMENTS, EBML_NONE },
749 { MATROSKA_ID_CHAPTERS, EBML_NONE },
750 { MATROSKA_ID_SEEKHEAD, EBML_NONE },
751 { 0 } /* We don't want to go back to level 0, so don't add the parent. */
755 static const char *const matroska_doctypes[] = { "matroska", "webm" };
757 static int matroska_read_close(AVFormatContext *s);
760 * This function prepares the status for parsing of level 1 elements.
762 static int matroska_reset_status(MatroskaDemuxContext *matroska,
763 uint32_t id, int64_t position)
766 int err = avio_seek(matroska->ctx->pb, position, SEEK_SET);
771 matroska->current_id = id;
772 matroska->num_levels = 1;
773 matroska->resync_pos = avio_tell(matroska->ctx->pb);
775 matroska->resync_pos -= (av_log2(id) + 7) / 8;
780 static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos)
782 AVIOContext *pb = matroska->ctx->pb;
785 /* Try to seek to the last position to resync from. If this doesn't work,
786 * we resync from the earliest position available: The start of the buffer. */
787 if (last_pos < avio_tell(pb) && avio_seek(pb, last_pos + 1, SEEK_SET) < 0) {
788 av_log(matroska->ctx, AV_LOG_WARNING,
789 "Seek to desired resync point failed. Seeking to "
790 "earliest point available instead.\n");
791 avio_seek(pb, FFMAX(avio_tell(pb) + (pb->buffer - pb->buf_ptr),
792 last_pos + 1), SEEK_SET);
797 // try to find a toplevel element
798 while (!avio_feof(pb)) {
799 if (id == MATROSKA_ID_INFO || id == MATROSKA_ID_TRACKS ||
800 id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS ||
801 id == MATROSKA_ID_SEEKHEAD || id == MATROSKA_ID_ATTACHMENTS ||
802 id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) {
803 /* Prepare the context for parsing of a level 1 element. */
804 matroska_reset_status(matroska, id, -1);
805 /* Given that we are here means that an error has occured,
806 * so treat the segment as unknown length in order not to
807 * discard valid data that happens to be beyond the designated
808 * end of the segment. */
809 matroska->levels[0].length = EBML_UNKNOWN_LENGTH;
812 id = (id << 8) | avio_r8(pb);
816 return pb->error ? pb->error : AVERROR_EOF;
820 * Read: an "EBML number", which is defined as a variable-length
821 * array of bytes. The first byte indicates the length by giving a
822 * number of 0-bits followed by a one. The position of the first
823 * "one" bit inside the first byte indicates the length of this
825 * Returns: number of bytes read, < 0 on error
827 static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb,
828 int max_size, uint64_t *number, int eof_forbidden)
834 /* The first byte tells us the length in bytes - except when it is zero. */
839 /* get the length of the EBML number */
840 read = 8 - ff_log2_tab[total];
842 if (!total || read > max_size) {
843 pos = avio_tell(pb) - 1;
845 av_log(matroska->ctx, AV_LOG_ERROR,
846 "0x00 at pos %"PRId64" (0x%"PRIx64") invalid as first byte "
847 "of an EBML number\n", pos, pos);
849 av_log(matroska->ctx, AV_LOG_ERROR,
850 "Length %d indicated by an EBML number's first byte 0x%02x "
851 "at pos %"PRId64" (0x%"PRIx64") exceeds max length %d.\n",
852 read, (uint8_t) total, pos, pos, max_size);
854 return AVERROR_INVALIDDATA;
857 /* read out length */
858 total ^= 1 << ff_log2_tab[total];
860 total = (total << 8) | avio_r8(pb);
862 if (pb->eof_reached) {
874 av_log(matroska->ctx, AV_LOG_ERROR,
875 "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
880 av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
881 "at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
888 * Read a EBML length value.
889 * This needs special handling for the "unknown length" case which has multiple
892 static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
895 int res = ebml_read_num(matroska, pb, 8, number, 1);
896 if (res > 0 && *number + 1 == 1ULL << (7 * res))
897 *number = EBML_UNKNOWN_LENGTH;
902 * Read the next element as an unsigned int.
903 * Returns NEEDS_CHECKING.
905 static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num)
909 /* big-endian ordering; build up number */
912 *num = (*num << 8) | avio_r8(pb);
914 return NEEDS_CHECKING;
918 * Read the next element as a signed int.
919 * Returns NEEDS_CHECKING.
921 static int ebml_read_sint(AVIOContext *pb, int size, int64_t *num)
928 *num = sign_extend(avio_r8(pb), 8);
930 /* big-endian ordering; build up number */
932 *num = ((uint64_t)*num << 8) | avio_r8(pb);
935 return NEEDS_CHECKING;
939 * Read the next element as a float.
940 * Returns NEEDS_CHECKING or < 0 on obvious failure.
942 static int ebml_read_float(AVIOContext *pb, int size, double *num)
947 *num = av_int2float(avio_rb32(pb));
949 *num = av_int2double(avio_rb64(pb));
951 return AVERROR_INVALIDDATA;
953 return NEEDS_CHECKING;
957 * Read the next element as an ASCII string.
958 * 0 is success, < 0 or NEEDS_CHECKING is failure.
960 static int ebml_read_ascii(AVIOContext *pb, int size, char **str)
965 /* EBML strings are usually not 0-terminated, so we allocate one
966 * byte more, read the string and NULL-terminate it ourselves. */
967 if (!(res = av_malloc(size + 1)))
968 return AVERROR(ENOMEM);
969 if ((ret = avio_read(pb, (uint8_t *) res, size)) != size) {
971 return ret < 0 ? ret : NEEDS_CHECKING;
981 * Read the next element as binary data.
982 * 0 is success, < 0 or NEEDS_CHECKING is failure.
984 static int ebml_read_binary(AVIOContext *pb, int length, EbmlBin *bin)
988 ret = av_buffer_realloc(&bin->buf, length + AV_INPUT_BUFFER_PADDING_SIZE);
991 memset(bin->buf->data + length, 0, AV_INPUT_BUFFER_PADDING_SIZE);
993 bin->data = bin->buf->data;
995 bin->pos = avio_tell(pb);
996 if ((ret = avio_read(pb, bin->data, length)) != length) {
997 av_buffer_unref(&bin->buf);
1000 return ret < 0 ? ret : NEEDS_CHECKING;
1007 * Read the next element, but only the header. The contents
1008 * are supposed to be sub-elements which can be read separately.
1009 * 0 is success, < 0 is failure.
1011 static int ebml_read_master(MatroskaDemuxContext *matroska, uint64_t length)
1013 AVIOContext *pb = matroska->ctx->pb;
1014 MatroskaLevel *level;
1016 if (matroska->num_levels >= EBML_MAX_DEPTH) {
1017 av_log(matroska->ctx, AV_LOG_ERROR,
1018 "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
1019 return AVERROR(ENOSYS);
1022 level = &matroska->levels[matroska->num_levels++];
1023 level->start = avio_tell(pb);
1024 level->length = length;
1030 * Read signed/unsigned "EBML" numbers.
1031 * Return: number of bytes processed, < 0 on error
1033 static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
1034 uint8_t *data, uint32_t size, uint64_t *num)
1037 ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
1038 return ebml_read_num(matroska, &pb, FFMIN(size, 8), num, 1);
1042 * Same as above, but signed.
1044 static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
1045 uint8_t *data, uint32_t size, int64_t *num)
1050 /* read as unsigned number first */
1051 if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
1054 /* make signed (weird way) */
1055 *num = unum - ((1LL << (7 * res - 1)) - 1);
1060 static int ebml_parse(MatroskaDemuxContext *matroska,
1061 EbmlSyntax *syntax, void *data);
1063 static EbmlSyntax *ebml_parse_id(EbmlSyntax *syntax, uint32_t id)
1066 for (i = 0; syntax[i].id; i++)
1067 if (id == syntax[i].id)
1073 static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
1078 for (i = 0; syntax[i].id; i++)
1079 switch (syntax[i].type) {
1081 *(int64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.i;
1084 *(uint64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.u;
1087 *(double *) ((char *) data + syntax[i].data_offset) = syntax[i].def.f;
1091 // the default may be NULL
1092 if (syntax[i].def.s) {
1093 uint8_t **dst = (uint8_t **) ((uint8_t *) data + syntax[i].data_offset);
1094 *dst = av_strdup(syntax[i].def.s);
1096 return AVERROR(ENOMEM);
1101 if (!matroska->levels[matroska->num_levels - 1].length) {
1102 matroska->num_levels--;
1107 res = ebml_parse(matroska, syntax, data);
1110 return res == LEVEL_ENDED ? 0 : res;
1113 static int is_ebml_id_valid(uint32_t id)
1115 // Due to endian nonsense in Matroska, the highest byte with any bits set
1116 // will contain the leading length bit. This bit in turn identifies the
1117 // total byte length of the element by its position within the byte.
1118 unsigned int bits = av_log2(id);
1119 return id && (bits + 7) / 8 == (8 - bits % 8);
1123 * Allocate and return the entry for the level1 element with the given ID. If
1124 * an entry already exists, return the existing entry.
1126 static MatroskaLevel1Element *matroska_find_level1_elem(MatroskaDemuxContext *matroska,
1130 MatroskaLevel1Element *elem;
1132 if (!is_ebml_id_valid(id))
1135 // Some files link to all clusters; useless.
1136 if (id == MATROSKA_ID_CLUSTER)
1139 // There can be multiple seekheads.
1140 if (id != MATROSKA_ID_SEEKHEAD) {
1141 for (i = 0; i < matroska->num_level1_elems; i++) {
1142 if (matroska->level1_elems[i].id == id)
1143 return &matroska->level1_elems[i];
1147 // Only a completely broken file would have more elements.
1148 // It also provides a low-effort way to escape from circular seekheads
1149 // (every iteration will add a level1 entry).
1150 if (matroska->num_level1_elems >= FF_ARRAY_ELEMS(matroska->level1_elems)) {
1151 av_log(matroska->ctx, AV_LOG_ERROR, "Too many level1 elements or circular seekheads.\n");
1155 elem = &matroska->level1_elems[matroska->num_level1_elems++];
1156 *elem = (MatroskaLevel1Element){.id = id};
1161 static int ebml_parse(MatroskaDemuxContext *matroska,
1162 EbmlSyntax *syntax, void *data)
1164 static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
1168 // max. 16 MB for strings
1169 [EBML_STR] = 0x1000000,
1170 [EBML_UTF8] = 0x1000000,
1171 // max. 256 MB for binary data
1172 [EBML_BIN] = 0x10000000,
1173 // no limits for anything else
1175 AVIOContext *pb = matroska->ctx->pb;
1178 int64_t pos = avio_tell(pb);
1179 int res, update_pos = 1, level_check;
1181 MatroskaLevel1Element *level1_elem;
1182 MatroskaLevel *level = matroska->num_levels ? &matroska->levels[matroska->num_levels - 1] : NULL;
1184 if (!matroska->current_id) {
1186 res = ebml_read_num(matroska, pb, 4, &id, 0);
1188 if (pb->eof_reached && res == AVERROR_EOF) {
1189 if (matroska->is_live)
1190 // in live mode, finish parsing if EOF is reached.
1192 if (level && level->length == EBML_UNKNOWN_LENGTH && pos == avio_tell(pb)) {
1193 // Unknown-length levels automatically end at EOF.
1194 matroska->num_levels--;
1200 matroska->current_id = id | 1 << 7 * res;
1202 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. */
1225 data = (char *) data + syntax->data_offset;
1226 if (syntax->list_elem_size) {
1227 EbmlList *list = data;
1228 newelem = av_realloc_array(list->elem, list->nb_elem + 1, syntax->list_elem_size);
1230 return AVERROR(ENOMEM);
1231 list->elem = newelem;
1232 data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
1233 memset(data, 0, syntax->list_elem_size);
1237 if (syntax->type != EBML_STOP) {
1238 matroska->current_id = 0;
1239 if ((res = ebml_read_length(matroska, pb, &length)) < 0)
1241 if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
1242 av_log(matroska->ctx, AV_LOG_ERROR,
1243 "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for syntax element %i\n",
1244 length, max_lengths[syntax->type], syntax->type);
1245 return AVERROR_INVALIDDATA;
1247 if (matroska->num_levels > 0) {
1248 MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
1249 AVIOContext *pb = matroska->ctx->pb;
1250 int64_t pos = avio_tell(pb);
1252 if (length != EBML_UNKNOWN_LENGTH &&
1253 level->length != EBML_UNKNOWN_LENGTH) {
1254 uint64_t elem_end = pos + length,
1255 level_end = level->start + level->length;
1257 if (elem_end < level_end) {
1259 } else if (elem_end == level_end) {
1260 level_check = LEVEL_ENDED;
1262 av_log(matroska->ctx, AV_LOG_ERROR,
1263 "Element at 0x%"PRIx64" ending at 0x%"PRIx64" exceeds "
1264 "containing master element ending at 0x%"PRIx64"\n",
1265 pos, elem_end, level_end);
1266 return AVERROR_INVALIDDATA;
1268 } else if (length != EBML_UNKNOWN_LENGTH) {
1270 } else if (level->length != EBML_UNKNOWN_LENGTH) {
1271 av_log(matroska->ctx, AV_LOG_ERROR, "Unknown-sized element "
1272 "at 0x%"PRIx64" inside parent with finite size\n", pos);
1273 return AVERROR_INVALIDDATA;
1274 } else if (id != MATROSKA_ID_CLUSTER) {
1275 // According to the specifications only clusters and segments
1276 // are allowed to be unknown-sized.
1277 av_log(matroska->ctx, AV_LOG_ERROR,
1278 "Found unknown-sized element other than a cluster at "
1279 "0x%"PRIx64". Dropping the invalid element.\n", pos);
1280 return AVERROR_INVALIDDATA;
1287 // We have found an element that is allowed at this place
1288 // in the hierarchy and it passed all checks, so treat the beginning
1289 // of the element as the "last known good" position.
1290 matroska->resync_pos = pos;
1294 switch (syntax->type) {
1296 res = ebml_read_uint(pb, length, data);
1299 res = ebml_read_sint(pb, length, data);
1302 res = ebml_read_float(pb, length, data);
1306 res = ebml_read_ascii(pb, length, data);
1309 res = ebml_read_binary(pb, length, data);
1313 if ((res = ebml_read_master(matroska, length)) < 0)
1315 if (id == MATROSKA_ID_SEGMENT)
1316 matroska->segment_start = avio_tell(matroska->ctx->pb);
1317 if (id == MATROSKA_ID_CUES)
1318 matroska->cues_parsing_deferred = 0;
1319 if (syntax->type == EBML_LEVEL1 &&
1320 (level1_elem = matroska_find_level1_elem(matroska, syntax->id))) {
1321 if (level1_elem->parsed)
1322 av_log(matroska->ctx, AV_LOG_ERROR, "Duplicate element\n");
1323 level1_elem->parsed = 1;
1325 if (res = ebml_parse_nest(matroska, syntax->def.n, data))
1333 if (ffio_limit(pb, length) != length) {
1334 // ffio_limit emits its own error message,
1335 // so we don't have to.
1336 return AVERROR(EIO);
1338 if ((res2 = avio_skip(pb, length - 1)) >= 0) {
1339 // avio_skip might take us past EOF. We check for this
1340 // by skipping only length - 1 bytes, reading a byte and
1341 // checking the error flags. This is done in order to check
1342 // that the element has been properly skipped even when
1343 // no filesize (that ffio_limit relies on) is available.
1345 res = NEEDS_CHECKING;
1352 if (res == NEEDS_CHECKING) {
1353 if (pb->eof_reached) {
1362 if (res == AVERROR_INVALIDDATA)
1363 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
1364 else if (res == AVERROR(EIO))
1365 av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
1366 else if (res == AVERROR_EOF) {
1367 av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely\n");
1375 if (level_check == LEVEL_ENDED && matroska->num_levels) {
1376 level = &matroska->levels[matroska->num_levels - 1];
1377 pos = avio_tell(pb);
1379 // Given that pos >= level->start no check for
1380 // level->length != EBML_UNKNOWN_LENGTH is necessary.
1381 while (matroska->num_levels && pos == level->start + level->length) {
1382 matroska->num_levels--;
1390 static void ebml_free(EbmlSyntax *syntax, void *data)
1393 for (i = 0; syntax[i].id; i++) {
1394 void *data_off = (char *) data + syntax[i].data_offset;
1395 switch (syntax[i].type) {
1401 av_buffer_unref(&((EbmlBin *) data_off)->buf);
1405 if (syntax[i].list_elem_size) {
1406 EbmlList *list = data_off;
1407 char *ptr = list->elem;
1408 for (j = 0; j < list->nb_elem;
1409 j++, ptr += syntax[i].list_elem_size)
1410 ebml_free(syntax[i].def.n, ptr);
1411 av_freep(&list->elem);
1414 ebml_free(syntax[i].def.n, data_off);
1424 static int matroska_probe(const AVProbeData *p)
1427 int len_mask = 0x80, size = 1, n = 1, i;
1430 if (AV_RB32(p->buf) != EBML_ID_HEADER)
1433 /* length of header */
1435 while (size <= 8 && !(total & len_mask)) {
1441 total &= (len_mask - 1);
1443 total = (total << 8) | p->buf[4 + n++];
1445 /* Does the probe data contain the whole header? */
1446 if (p->buf_size < 4 + size + total)
1449 /* The header should contain a known document type. For now,
1450 * we don't parse the whole header but simply check for the
1451 * availability of that array of characters inside the header.
1452 * Not fully fool-proof, but good enough. */
1453 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
1454 size_t probelen = strlen(matroska_doctypes[i]);
1455 if (total < probelen)
1457 for (n = 4 + size; n <= 4 + size + total - probelen; n++)
1458 if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
1459 return AVPROBE_SCORE_MAX;
1462 // probably valid EBML header but no recognized doctype
1463 return AVPROBE_SCORE_EXTENSION;
1466 static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
1469 MatroskaTrack *tracks = matroska->tracks.elem;
1472 for (i = 0; i < matroska->tracks.nb_elem; i++)
1473 if (tracks[i].num == num)
1476 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
1480 static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
1481 MatroskaTrack *track)
1483 MatroskaTrackEncoding *encodings = track->encodings.elem;
1484 uint8_t *data = *buf;
1485 int isize = *buf_size;
1486 uint8_t *pkt_data = NULL;
1487 uint8_t av_unused *newpktdata;
1488 int pkt_size = isize;
1492 if (pkt_size >= 10000000U)
1493 return AVERROR_INVALIDDATA;
1495 switch (encodings[0].compression.algo) {
1496 case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
1498 int header_size = encodings[0].compression.settings.size;
1499 uint8_t *header = encodings[0].compression.settings.data;
1501 if (header_size && !header) {
1502 av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
1509 pkt_size = isize + header_size;
1510 pkt_data = av_malloc(pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1512 return AVERROR(ENOMEM);
1514 memcpy(pkt_data, header, header_size);
1515 memcpy(pkt_data + header_size, data, isize);
1519 case MATROSKA_TRACK_ENCODING_COMP_LZO:
1521 olen = pkt_size *= 3;
1522 newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING
1523 + AV_INPUT_BUFFER_PADDING_SIZE);
1525 result = AVERROR(ENOMEM);
1528 pkt_data = newpktdata;
1529 result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
1530 } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
1532 result = AVERROR_INVALIDDATA;
1539 case MATROSKA_TRACK_ENCODING_COMP_ZLIB:
1541 z_stream zstream = { 0 };
1542 if (inflateInit(&zstream) != Z_OK)
1544 zstream.next_in = data;
1545 zstream.avail_in = isize;
1548 newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1550 inflateEnd(&zstream);
1551 result = AVERROR(ENOMEM);
1554 pkt_data = newpktdata;
1555 zstream.avail_out = pkt_size - zstream.total_out;
1556 zstream.next_out = pkt_data + zstream.total_out;
1557 result = inflate(&zstream, Z_NO_FLUSH);
1558 } while (result == Z_OK && pkt_size < 10000000);
1559 pkt_size = zstream.total_out;
1560 inflateEnd(&zstream);
1561 if (result != Z_STREAM_END) {
1562 if (result == Z_MEM_ERROR)
1563 result = AVERROR(ENOMEM);
1565 result = AVERROR_INVALIDDATA;
1572 case MATROSKA_TRACK_ENCODING_COMP_BZLIB:
1574 bz_stream bzstream = { 0 };
1575 if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1577 bzstream.next_in = data;
1578 bzstream.avail_in = isize;
1581 newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
1583 BZ2_bzDecompressEnd(&bzstream);
1584 result = AVERROR(ENOMEM);
1587 pkt_data = newpktdata;
1588 bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1589 bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1590 result = BZ2_bzDecompress(&bzstream);
1591 } while (result == BZ_OK && pkt_size < 10000000);
1592 pkt_size = bzstream.total_out_lo32;
1593 BZ2_bzDecompressEnd(&bzstream);
1594 if (result != BZ_STREAM_END) {
1595 if (result == BZ_MEM_ERROR)
1596 result = AVERROR(ENOMEM);
1598 result = AVERROR_INVALIDDATA;
1605 return AVERROR_INVALIDDATA;
1608 memset(pkt_data + pkt_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
1611 *buf_size = pkt_size;
1619 static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1620 AVDictionary **metadata, char *prefix)
1622 MatroskaTag *tags = list->elem;
1626 for (i = 0; i < list->nb_elem; i++) {
1627 const char *lang = tags[i].lang &&
1628 strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1630 if (!tags[i].name) {
1631 av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
1635 snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1637 av_strlcpy(key, tags[i].name, sizeof(key));
1638 if (tags[i].def || !lang) {
1639 av_dict_set(metadata, key, tags[i].string, 0);
1640 if (tags[i].sub.nb_elem)
1641 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1644 av_strlcat(key, "-", sizeof(key));
1645 av_strlcat(key, lang, sizeof(key));
1646 av_dict_set(metadata, key, tags[i].string, 0);
1647 if (tags[i].sub.nb_elem)
1648 matroska_convert_tag(s, &tags[i].sub, metadata, key);
1651 ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
1654 static void matroska_convert_tags(AVFormatContext *s)
1656 MatroskaDemuxContext *matroska = s->priv_data;
1657 MatroskaTags *tags = matroska->tags.elem;
1660 for (i = 0; i < matroska->tags.nb_elem; i++) {
1661 if (tags[i].target.attachuid) {
1662 MatroskaAttachment *attachment = matroska->attachments.elem;
1664 for (j = 0; j < matroska->attachments.nb_elem; j++) {
1665 if (attachment[j].uid == tags[i].target.attachuid &&
1666 attachment[j].stream) {
1667 matroska_convert_tag(s, &tags[i].tag,
1668 &attachment[j].stream->metadata, NULL);
1673 av_log(NULL, AV_LOG_WARNING,
1674 "The tags at index %d refer to a "
1675 "non-existent attachment %"PRId64".\n",
1676 i, tags[i].target.attachuid);
1678 } else if (tags[i].target.chapteruid) {
1679 MatroskaChapter *chapter = matroska->chapters.elem;
1681 for (j = 0; j < matroska->chapters.nb_elem; j++) {
1682 if (chapter[j].uid == tags[i].target.chapteruid &&
1683 chapter[j].chapter) {
1684 matroska_convert_tag(s, &tags[i].tag,
1685 &chapter[j].chapter->metadata, NULL);
1690 av_log(NULL, AV_LOG_WARNING,
1691 "The tags at index %d refer to a non-existent chapter "
1693 i, tags[i].target.chapteruid);
1695 } else if (tags[i].target.trackuid) {
1696 MatroskaTrack *track = matroska->tracks.elem;
1698 for (j = 0; j < matroska->tracks.nb_elem; j++) {
1699 if (track[j].uid == tags[i].target.trackuid &&
1701 matroska_convert_tag(s, &tags[i].tag,
1702 &track[j].stream->metadata, NULL);
1707 av_log(NULL, AV_LOG_WARNING,
1708 "The tags at index %d refer to a non-existent track "
1710 i, tags[i].target.trackuid);
1713 matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1714 tags[i].target.type);
1719 static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
1722 uint32_t saved_id = matroska->current_id;
1723 int64_t before_pos = avio_tell(matroska->ctx->pb);
1724 MatroskaLevel level;
1729 offset = pos + matroska->segment_start;
1730 if (avio_seek(matroska->ctx->pb, offset, SEEK_SET) == offset) {
1731 /* We don't want to lose our seekhead level, so we add
1732 * a dummy. This is a crude hack. */
1733 if (matroska->num_levels == EBML_MAX_DEPTH) {
1734 av_log(matroska->ctx, AV_LOG_INFO,
1735 "Max EBML element depth (%d) reached, "
1736 "cannot parse further.\n", EBML_MAX_DEPTH);
1737 ret = AVERROR_INVALIDDATA;
1740 level.length = EBML_UNKNOWN_LENGTH;
1741 matroska->levels[matroska->num_levels] = level;
1742 matroska->num_levels++;
1743 matroska->current_id = 0;
1745 ret = ebml_parse(matroska, matroska_segment, matroska);
1746 if (ret == LEVEL_ENDED) {
1747 /* This can only happen if the seek brought us beyond EOF. */
1752 /* Seek back - notice that in all instances where this is used
1753 * it is safe to set the level to 1. */
1754 matroska_reset_status(matroska, saved_id, before_pos);
1759 static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1761 EbmlList *seekhead_list = &matroska->seekhead;
1764 // we should not do any seeking in the streaming case
1765 if (!(matroska->ctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
1768 for (i = 0; i < seekhead_list->nb_elem; i++) {
1769 MatroskaSeekhead *seekheads = seekhead_list->elem;
1770 uint32_t id = seekheads[i].id;
1771 uint64_t pos = seekheads[i].pos;
1773 MatroskaLevel1Element *elem = matroska_find_level1_elem(matroska, id);
1774 if (!elem || elem->parsed)
1779 // defer cues parsing until we actually need cue data.
1780 if (id == MATROSKA_ID_CUES)
1783 if (matroska_parse_seekhead_entry(matroska, pos) < 0) {
1784 // mark index as broken
1785 matroska->cues_parsing_deferred = -1;
1793 static void matroska_add_index_entries(MatroskaDemuxContext *matroska)
1795 EbmlList *index_list;
1796 MatroskaIndex *index;
1797 uint64_t index_scale = 1;
1800 if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1803 index_list = &matroska->index;
1804 index = index_list->elem;
1805 if (index_list->nb_elem < 2)
1807 if (index[1].time > 1E14 / matroska->time_scale) {
1808 av_log(matroska->ctx, AV_LOG_WARNING, "Dropping apparently-broken index.\n");
1811 for (i = 0; i < index_list->nb_elem; i++) {
1812 EbmlList *pos_list = &index[i].pos;
1813 MatroskaIndexPos *pos = pos_list->elem;
1814 for (j = 0; j < pos_list->nb_elem; j++) {
1815 MatroskaTrack *track = matroska_find_track_by_num(matroska,
1817 if (track && track->stream)
1818 av_add_index_entry(track->stream,
1819 pos[j].pos + matroska->segment_start,
1820 index[i].time / index_scale, 0, 0,
1826 static void matroska_parse_cues(MatroskaDemuxContext *matroska) {
1829 if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
1832 for (i = 0; i < matroska->num_level1_elems; i++) {
1833 MatroskaLevel1Element *elem = &matroska->level1_elems[i];
1834 if (elem->id == MATROSKA_ID_CUES && !elem->parsed) {
1835 if (matroska_parse_seekhead_entry(matroska, elem->pos) < 0)
1836 matroska->cues_parsing_deferred = -1;
1842 matroska_add_index_entries(matroska);
1845 static int matroska_aac_profile(char *codec_id)
1847 static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
1850 for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
1851 if (strstr(codec_id, aac_profiles[profile]))
1856 static int matroska_aac_sri(int samplerate)
1860 for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
1861 if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
1866 static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
1868 /* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
1869 avpriv_dict_set_timestamp(metadata, "creation_time", date_utc / 1000 + 978307200000000LL);
1872 static int matroska_parse_flac(AVFormatContext *s,
1873 MatroskaTrack *track,
1876 AVStream *st = track->stream;
1877 uint8_t *p = track->codec_priv.data;
1878 int size = track->codec_priv.size;
1880 if (size < 8 + FLAC_STREAMINFO_SIZE || p[4] & 0x7f) {
1881 av_log(s, AV_LOG_WARNING, "Invalid FLAC private data\n");
1882 track->codec_priv.size = 0;
1886 track->codec_priv.size = 8 + FLAC_STREAMINFO_SIZE;
1888 p += track->codec_priv.size;
1889 size -= track->codec_priv.size;
1891 /* parse the remaining metadata blocks if present */
1893 int block_last, block_type, block_size;
1895 flac_parse_block_header(p, &block_last, &block_type, &block_size);
1899 if (block_size > size)
1902 /* check for the channel mask */
1903 if (block_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
1904 AVDictionary *dict = NULL;
1905 AVDictionaryEntry *chmask;
1907 ff_vorbis_comment(s, &dict, p, block_size, 0);
1908 chmask = av_dict_get(dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
1910 uint64_t mask = strtol(chmask->value, NULL, 0);
1911 if (!mask || mask & ~0x3ffffULL) {
1912 av_log(s, AV_LOG_WARNING,
1913 "Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
1915 st->codecpar->channel_layout = mask;
1917 av_dict_free(&dict);
1927 static int mkv_field_order(MatroskaDemuxContext *matroska, int64_t field_order)
1929 int major, minor, micro, bttb = 0;
1931 /* workaround a bug in our Matroska muxer, introduced in version 57.36 alongside
1932 * this function, and fixed in 57.52 */
1933 if (matroska->muxingapp && sscanf(matroska->muxingapp, "Lavf%d.%d.%d", &major, &minor, µ) == 3)
1934 bttb = (major == 57 && minor >= 36 && minor <= 51 && micro >= 100);
1936 switch (field_order) {
1937 case MATROSKA_VIDEO_FIELDORDER_PROGRESSIVE:
1938 return AV_FIELD_PROGRESSIVE;
1939 case MATROSKA_VIDEO_FIELDORDER_UNDETERMINED:
1940 return AV_FIELD_UNKNOWN;
1941 case MATROSKA_VIDEO_FIELDORDER_TT:
1943 case MATROSKA_VIDEO_FIELDORDER_BB:
1945 case MATROSKA_VIDEO_FIELDORDER_BT:
1946 return bttb ? AV_FIELD_TB : AV_FIELD_BT;
1947 case MATROSKA_VIDEO_FIELDORDER_TB:
1948 return bttb ? AV_FIELD_BT : AV_FIELD_TB;
1950 return AV_FIELD_UNKNOWN;
1954 static void mkv_stereo_mode_display_mul(int stereo_mode,
1955 int *h_width, int *h_height)
1957 switch (stereo_mode) {
1958 case MATROSKA_VIDEO_STEREOMODE_TYPE_MONO:
1959 case MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_RL:
1960 case MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR:
1961 case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_RL:
1962 case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR:
1964 case MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT:
1965 case MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT:
1966 case MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_RL:
1967 case MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR:
1970 case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTTOM_TOP:
1971 case MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM:
1972 case MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_RL:
1973 case MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR:
1979 static int mkv_parse_video_color(AVStream *st, const MatroskaTrack *track) {
1980 const MatroskaTrackVideoColor *color = track->video.color.elem;
1981 const MatroskaMasteringMeta *mastering_meta;
1982 int has_mastering_primaries, has_mastering_luminance;
1984 if (!track->video.color.nb_elem)
1987 mastering_meta = &color->mastering_meta;
1988 // Mastering primaries are CIE 1931 coords, and must be > 0.
1989 has_mastering_primaries =
1990 mastering_meta->r_x > 0 && mastering_meta->r_y > 0 &&
1991 mastering_meta->g_x > 0 && mastering_meta->g_y > 0 &&
1992 mastering_meta->b_x > 0 && mastering_meta->b_y > 0 &&
1993 mastering_meta->white_x > 0 && mastering_meta->white_y > 0;
1994 has_mastering_luminance = mastering_meta->max_luminance > 0;
1996 if (color->matrix_coefficients != AVCOL_SPC_RESERVED)
1997 st->codecpar->color_space = color->matrix_coefficients;
1998 if (color->primaries != AVCOL_PRI_RESERVED &&
1999 color->primaries != AVCOL_PRI_RESERVED0)
2000 st->codecpar->color_primaries = color->primaries;
2001 if (color->transfer_characteristics != AVCOL_TRC_RESERVED &&
2002 color->transfer_characteristics != AVCOL_TRC_RESERVED0)
2003 st->codecpar->color_trc = color->transfer_characteristics;
2004 if (color->range != AVCOL_RANGE_UNSPECIFIED &&
2005 color->range <= AVCOL_RANGE_JPEG)
2006 st->codecpar->color_range = color->range;
2007 if (color->chroma_siting_horz != MATROSKA_COLOUR_CHROMASITINGHORZ_UNDETERMINED &&
2008 color->chroma_siting_vert != MATROSKA_COLOUR_CHROMASITINGVERT_UNDETERMINED &&
2009 color->chroma_siting_horz < MATROSKA_COLOUR_CHROMASITINGHORZ_NB &&
2010 color->chroma_siting_vert < MATROSKA_COLOUR_CHROMASITINGVERT_NB) {
2011 st->codecpar->chroma_location =
2012 avcodec_chroma_pos_to_enum((color->chroma_siting_horz - 1) << 7,
2013 (color->chroma_siting_vert - 1) << 7);
2015 if (color->max_cll && color->max_fall) {
2018 AVContentLightMetadata *metadata = av_content_light_metadata_alloc(&size);
2020 return AVERROR(ENOMEM);
2021 ret = av_stream_add_side_data(st, AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
2022 (uint8_t *)metadata, size);
2024 av_freep(&metadata);
2027 metadata->MaxCLL = color->max_cll;
2028 metadata->MaxFALL = color->max_fall;
2031 if (has_mastering_primaries || has_mastering_luminance) {
2032 // Use similar rationals as other standards.
2033 const int chroma_den = 50000;
2034 const int luma_den = 10000;
2035 AVMasteringDisplayMetadata *metadata =
2036 (AVMasteringDisplayMetadata*) av_stream_new_side_data(
2037 st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
2038 sizeof(AVMasteringDisplayMetadata));
2040 return AVERROR(ENOMEM);
2042 memset(metadata, 0, sizeof(AVMasteringDisplayMetadata));
2043 if (has_mastering_primaries) {
2044 metadata->display_primaries[0][0] = av_make_q(
2045 round(mastering_meta->r_x * chroma_den), chroma_den);
2046 metadata->display_primaries[0][1] = av_make_q(
2047 round(mastering_meta->r_y * chroma_den), chroma_den);
2048 metadata->display_primaries[1][0] = av_make_q(
2049 round(mastering_meta->g_x * chroma_den), chroma_den);
2050 metadata->display_primaries[1][1] = av_make_q(
2051 round(mastering_meta->g_y * chroma_den), chroma_den);
2052 metadata->display_primaries[2][0] = av_make_q(
2053 round(mastering_meta->b_x * chroma_den), chroma_den);
2054 metadata->display_primaries[2][1] = av_make_q(
2055 round(mastering_meta->b_y * chroma_den), chroma_den);
2056 metadata->white_point[0] = av_make_q(
2057 round(mastering_meta->white_x * chroma_den), chroma_den);
2058 metadata->white_point[1] = av_make_q(
2059 round(mastering_meta->white_y * chroma_den), chroma_den);
2060 metadata->has_primaries = 1;
2062 if (has_mastering_luminance) {
2063 metadata->max_luminance = av_make_q(
2064 round(mastering_meta->max_luminance * luma_den), luma_den);
2065 metadata->min_luminance = av_make_q(
2066 round(mastering_meta->min_luminance * luma_den), luma_den);
2067 metadata->has_luminance = 1;
2073 static int mkv_parse_video_projection(AVStream *st, const MatroskaTrack *track) {
2074 AVSphericalMapping *spherical;
2075 enum AVSphericalProjection projection;
2076 size_t spherical_size;
2077 uint32_t l = 0, t = 0, r = 0, b = 0;
2078 uint32_t padding = 0;
2082 bytestream2_init(&gb, track->video.projection.private.data,
2083 track->video.projection.private.size);
2085 if (bytestream2_get_byte(&gb) != 0) {
2086 av_log(NULL, AV_LOG_WARNING, "Unknown spherical metadata\n");
2090 bytestream2_skip(&gb, 3); // flags
2092 switch (track->video.projection.type) {
2093 case MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR:
2094 if (track->video.projection.private.size == 20) {
2095 t = bytestream2_get_be32(&gb);
2096 b = bytestream2_get_be32(&gb);
2097 l = bytestream2_get_be32(&gb);
2098 r = bytestream2_get_be32(&gb);
2100 if (b >= UINT_MAX - t || r >= UINT_MAX - l) {
2101 av_log(NULL, AV_LOG_ERROR,
2102 "Invalid bounding rectangle coordinates "
2103 "%"PRIu32",%"PRIu32",%"PRIu32",%"PRIu32"\n",
2105 return AVERROR_INVALIDDATA;
2107 } else if (track->video.projection.private.size != 0) {
2108 av_log(NULL, AV_LOG_ERROR, "Unknown spherical metadata\n");
2109 return AVERROR_INVALIDDATA;
2112 if (l || t || r || b)
2113 projection = AV_SPHERICAL_EQUIRECTANGULAR_TILE;
2115 projection = AV_SPHERICAL_EQUIRECTANGULAR;
2117 case MATROSKA_VIDEO_PROJECTION_TYPE_CUBEMAP:
2118 if (track->video.projection.private.size < 4) {
2119 av_log(NULL, AV_LOG_ERROR, "Missing projection private properties\n");
2120 return AVERROR_INVALIDDATA;
2121 } else if (track->video.projection.private.size == 12) {
2122 uint32_t layout = bytestream2_get_be32(&gb);
2124 av_log(NULL, AV_LOG_WARNING,
2125 "Unknown spherical cubemap layout %"PRIu32"\n", layout);
2128 projection = AV_SPHERICAL_CUBEMAP;
2129 padding = bytestream2_get_be32(&gb);
2131 av_log(NULL, AV_LOG_ERROR, "Unknown spherical metadata\n");
2132 return AVERROR_INVALIDDATA;
2135 case MATROSKA_VIDEO_PROJECTION_TYPE_RECTANGULAR:
2136 /* No Spherical metadata */
2139 av_log(NULL, AV_LOG_WARNING,
2140 "Unknown spherical metadata type %"PRIu64"\n",
2141 track->video.projection.type);
2145 spherical = av_spherical_alloc(&spherical_size);
2147 return AVERROR(ENOMEM);
2149 spherical->projection = projection;
2151 spherical->yaw = (int32_t) (track->video.projection.yaw * (1 << 16));
2152 spherical->pitch = (int32_t) (track->video.projection.pitch * (1 << 16));
2153 spherical->roll = (int32_t) (track->video.projection.roll * (1 << 16));
2155 spherical->padding = padding;
2157 spherical->bound_left = l;
2158 spherical->bound_top = t;
2159 spherical->bound_right = r;
2160 spherical->bound_bottom = b;
2162 ret = av_stream_add_side_data(st, AV_PKT_DATA_SPHERICAL, (uint8_t *)spherical,
2165 av_freep(&spherical);
2172 static int get_qt_codec(MatroskaTrack *track, uint32_t *fourcc, enum AVCodecID *codec_id)
2174 const AVCodecTag *codec_tags;
2176 codec_tags = track->type == MATROSKA_TRACK_TYPE_VIDEO ?
2177 ff_codec_movvideo_tags : ff_codec_movaudio_tags;
2179 /* Normalize noncompliant private data that starts with the fourcc
2180 * by expanding/shifting the data by 4 bytes and storing the data
2181 * size at the start. */
2182 if (ff_codec_get_id(codec_tags, AV_RL32(track->codec_priv.data))) {
2183 int ret = av_buffer_realloc(&track->codec_priv.buf,
2184 track->codec_priv.size + 4 + AV_INPUT_BUFFER_PADDING_SIZE);
2188 track->codec_priv.data = track->codec_priv.buf->data;
2189 memmove(track->codec_priv.data + 4, track->codec_priv.data, track->codec_priv.size);
2190 track->codec_priv.size += 4;
2191 AV_WB32(track->codec_priv.data, track->codec_priv.size);
2194 *fourcc = AV_RL32(track->codec_priv.data + 4);
2195 *codec_id = ff_codec_get_id(codec_tags, *fourcc);
2200 static int matroska_parse_tracks(AVFormatContext *s)
2202 MatroskaDemuxContext *matroska = s->priv_data;
2203 MatroskaTrack *tracks = matroska->tracks.elem;
2208 for (i = 0; i < matroska->tracks.nb_elem; i++) {
2209 MatroskaTrack *track = &tracks[i];
2210 enum AVCodecID codec_id = AV_CODEC_ID_NONE;
2211 EbmlList *encodings_list = &track->encodings;
2212 MatroskaTrackEncoding *encodings = encodings_list->elem;
2213 uint8_t *extradata = NULL;
2214 int extradata_size = 0;
2215 int extradata_offset = 0;
2216 uint32_t fourcc = 0;
2218 char* key_id_base64 = NULL;
2221 /* Apply some sanity checks. */
2222 if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
2223 track->type != MATROSKA_TRACK_TYPE_AUDIO &&
2224 track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
2225 track->type != MATROSKA_TRACK_TYPE_METADATA) {
2226 av_log(matroska->ctx, AV_LOG_INFO,
2227 "Unknown or unsupported track type %"PRIu64"\n",
2231 if (!track->codec_id)
2234 if (track->audio.samplerate < 0 || track->audio.samplerate > INT_MAX ||
2235 isnan(track->audio.samplerate)) {
2236 av_log(matroska->ctx, AV_LOG_WARNING,
2237 "Invalid sample rate %f, defaulting to 8000 instead.\n",
2238 track->audio.samplerate);
2239 track->audio.samplerate = 8000;
2242 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2243 if (!track->default_duration && track->video.frame_rate > 0) {
2244 double default_duration = 1000000000 / track->video.frame_rate;
2245 if (default_duration > UINT64_MAX || default_duration < 0) {
2246 av_log(matroska->ctx, AV_LOG_WARNING,
2247 "Invalid frame rate %e. Cannot calculate default duration.\n",
2248 track->video.frame_rate);
2250 track->default_duration = default_duration;
2253 if (track->video.display_width == -1)
2254 track->video.display_width = track->video.pixel_width;
2255 if (track->video.display_height == -1)
2256 track->video.display_height = track->video.pixel_height;
2257 if (track->video.color_space.size == 4)
2258 fourcc = AV_RL32(track->video.color_space.data);
2259 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2260 if (!track->audio.out_samplerate)
2261 track->audio.out_samplerate = track->audio.samplerate;
2263 if (encodings_list->nb_elem > 1) {
2264 av_log(matroska->ctx, AV_LOG_ERROR,
2265 "Multiple combined encodings not supported");
2266 } else if (encodings_list->nb_elem == 1) {
2267 if (encodings[0].type) {
2268 if (encodings[0].encryption.key_id.size > 0) {
2269 /* Save the encryption key id to be stored later as a
2271 const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
2272 key_id_base64 = av_malloc(b64_size);
2273 if (key_id_base64 == NULL)
2274 return AVERROR(ENOMEM);
2276 av_base64_encode(key_id_base64, b64_size,
2277 encodings[0].encryption.key_id.data,
2278 encodings[0].encryption.key_id.size);
2280 encodings[0].scope = 0;
2281 av_log(matroska->ctx, AV_LOG_ERROR,
2282 "Unsupported encoding type");
2286 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
2289 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
2292 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO &&
2294 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP) {
2295 encodings[0].scope = 0;
2296 av_log(matroska->ctx, AV_LOG_ERROR,
2297 "Unsupported encoding type");
2298 } else if (track->codec_priv.size && encodings[0].scope & 2) {
2299 uint8_t *codec_priv = track->codec_priv.data;
2300 int ret = matroska_decode_buffer(&track->codec_priv.data,
2301 &track->codec_priv.size,
2304 track->codec_priv.data = NULL;
2305 track->codec_priv.size = 0;
2306 av_log(matroska->ctx, AV_LOG_ERROR,
2307 "Failed to decode codec private data\n");
2310 if (codec_priv != track->codec_priv.data) {
2311 av_buffer_unref(&track->codec_priv.buf);
2312 if (track->codec_priv.data) {
2313 track->codec_priv.buf = av_buffer_create(track->codec_priv.data,
2314 track->codec_priv.size + AV_INPUT_BUFFER_PADDING_SIZE,
2316 if (!track->codec_priv.buf) {
2317 av_freep(&track->codec_priv.data);
2318 track->codec_priv.size = 0;
2319 return AVERROR(ENOMEM);
2326 for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
2327 if (!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
2328 strlen(ff_mkv_codec_tags[j].str))) {
2329 codec_id = ff_mkv_codec_tags[j].id;
2334 st = track->stream = avformat_new_stream(s, NULL);
2336 av_free(key_id_base64);
2337 return AVERROR(ENOMEM);
2340 if (key_id_base64) {
2341 /* export encryption key id as base64 metadata tag */
2342 av_dict_set(&st->metadata, "enc_key_id", key_id_base64, 0);
2343 av_freep(&key_id_base64);
2346 if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
2347 track->codec_priv.size >= 40 &&
2348 track->codec_priv.data) {
2349 track->ms_compat = 1;
2350 bit_depth = AV_RL16(track->codec_priv.data + 14);
2351 fourcc = AV_RL32(track->codec_priv.data + 16);
2352 codec_id = ff_codec_get_id(ff_codec_bmp_tags,
2355 codec_id = ff_codec_get_id(ff_codec_movvideo_tags,
2357 extradata_offset = 40;
2358 } else if (!strcmp(track->codec_id, "A_MS/ACM") &&
2359 track->codec_priv.size >= 14 &&
2360 track->codec_priv.data) {
2362 ffio_init_context(&b, track->codec_priv.data,
2363 track->codec_priv.size,
2364 0, NULL, NULL, NULL, NULL);
2365 ret = ff_get_wav_header(s, &b, st->codecpar, track->codec_priv.size, 0);
2368 codec_id = st->codecpar->codec_id;
2369 fourcc = st->codecpar->codec_tag;
2370 extradata_offset = FFMIN(track->codec_priv.size, 18);
2371 } else if (!strcmp(track->codec_id, "A_QUICKTIME")
2372 /* Normally 36, but allow noncompliant private data */
2373 && (track->codec_priv.size >= 32)
2374 && (track->codec_priv.data)) {
2375 uint16_t sample_size;
2376 int ret = get_qt_codec(track, &fourcc, &codec_id);
2379 sample_size = AV_RB16(track->codec_priv.data + 26);
2381 if (sample_size == 8) {
2382 fourcc = MKTAG('r','a','w',' ');
2383 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2384 } else if (sample_size == 16) {
2385 fourcc = MKTAG('t','w','o','s');
2386 codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
2389 if ((fourcc == MKTAG('t','w','o','s') ||
2390 fourcc == MKTAG('s','o','w','t')) &&
2392 codec_id = AV_CODEC_ID_PCM_S8;
2393 } else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
2394 (track->codec_priv.size >= 21) &&
2395 (track->codec_priv.data)) {
2396 int ret = get_qt_codec(track, &fourcc, &codec_id);
2399 if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI ")) {
2400 fourcc = MKTAG('S','V','Q','3');
2401 codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
2403 if (codec_id == AV_CODEC_ID_NONE)
2404 av_log(matroska->ctx, AV_LOG_ERROR,
2405 "mov FourCC not found %s.\n", av_fourcc2str(fourcc));
2406 if (track->codec_priv.size >= 86) {
2407 bit_depth = AV_RB16(track->codec_priv.data + 82);
2408 ffio_init_context(&b, track->codec_priv.data,
2409 track->codec_priv.size,
2410 0, NULL, NULL, NULL, NULL);
2411 if (ff_get_qtpalette(codec_id, &b, track->palette)) {
2413 track->has_palette = 1;
2416 } else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
2417 switch (track->audio.bitdepth) {
2419 codec_id = AV_CODEC_ID_PCM_U8;
2422 codec_id = AV_CODEC_ID_PCM_S24BE;
2425 codec_id = AV_CODEC_ID_PCM_S32BE;
2428 } else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
2429 switch (track->audio.bitdepth) {
2431 codec_id = AV_CODEC_ID_PCM_U8;
2434 codec_id = AV_CODEC_ID_PCM_S24LE;
2437 codec_id = AV_CODEC_ID_PCM_S32LE;
2440 } else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
2441 track->audio.bitdepth == 64) {
2442 codec_id = AV_CODEC_ID_PCM_F64LE;
2443 } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
2444 int profile = matroska_aac_profile(track->codec_id);
2445 int sri = matroska_aac_sri(track->audio.samplerate);
2446 extradata = av_mallocz(5 + AV_INPUT_BUFFER_PADDING_SIZE);
2448 return AVERROR(ENOMEM);
2449 extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
2450 extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
2451 if (strstr(track->codec_id, "SBR")) {
2452 sri = matroska_aac_sri(track->audio.out_samplerate);
2453 extradata[2] = 0x56;
2454 extradata[3] = 0xE5;
2455 extradata[4] = 0x80 | (sri << 3);
2459 } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - AV_INPUT_BUFFER_PADDING_SIZE) {
2460 /* Only ALAC's magic cookie is stored in Matroska's track headers.
2461 * Create the "atom size", "tag", and "tag version" fields the
2462 * decoder expects manually. */
2463 extradata_size = 12 + track->codec_priv.size;
2464 extradata = av_mallocz(extradata_size +
2465 AV_INPUT_BUFFER_PADDING_SIZE);
2467 return AVERROR(ENOMEM);
2468 AV_WB32(extradata, extradata_size);
2469 memcpy(&extradata[4], "alac", 4);
2470 AV_WB32(&extradata[8], 0);
2471 memcpy(&extradata[12], track->codec_priv.data,
2472 track->codec_priv.size);
2473 } else if (codec_id == AV_CODEC_ID_TTA) {
2474 extradata_size = 30;
2475 extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
2477 return AVERROR(ENOMEM);
2478 ffio_init_context(&b, extradata, extradata_size, 1,
2479 NULL, NULL, NULL, NULL);
2480 avio_write(&b, "TTA1", 4);
2482 if (track->audio.channels > UINT16_MAX ||
2483 track->audio.bitdepth > UINT16_MAX) {
2484 av_log(matroska->ctx, AV_LOG_WARNING,
2485 "Too large audio channel number %"PRIu64
2486 " or bitdepth %"PRIu64". Skipping track.\n",
2487 track->audio.channels, track->audio.bitdepth);
2488 av_freep(&extradata);
2489 if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
2490 return AVERROR_INVALIDDATA;
2494 avio_wl16(&b, track->audio.channels);
2495 avio_wl16(&b, track->audio.bitdepth);
2496 if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
2497 return AVERROR_INVALIDDATA;
2498 avio_wl32(&b, track->audio.out_samplerate);
2499 avio_wl32(&b, av_rescale((matroska->duration * matroska->time_scale),
2500 track->audio.out_samplerate,
2501 AV_TIME_BASE * 1000));
2502 } else if (codec_id == AV_CODEC_ID_RV10 ||
2503 codec_id == AV_CODEC_ID_RV20 ||
2504 codec_id == AV_CODEC_ID_RV30 ||
2505 codec_id == AV_CODEC_ID_RV40) {
2506 extradata_offset = 26;
2507 } else if (codec_id == AV_CODEC_ID_RA_144) {
2508 track->audio.out_samplerate = 8000;
2509 track->audio.channels = 1;
2510 } else if ((codec_id == AV_CODEC_ID_RA_288 ||
2511 codec_id == AV_CODEC_ID_COOK ||
2512 codec_id == AV_CODEC_ID_ATRAC3 ||
2513 codec_id == AV_CODEC_ID_SIPR)
2514 && track->codec_priv.data) {
2517 ffio_init_context(&b, track->codec_priv.data,
2518 track->codec_priv.size,
2519 0, NULL, NULL, NULL, NULL);
2521 flavor = avio_rb16(&b);
2522 track->audio.coded_framesize = avio_rb32(&b);
2524 track->audio.sub_packet_h = avio_rb16(&b);
2525 track->audio.frame_size = avio_rb16(&b);
2526 track->audio.sub_packet_size = avio_rb16(&b);
2528 track->audio.coded_framesize <= 0 ||
2529 track->audio.sub_packet_h <= 0 ||
2530 track->audio.frame_size <= 0 ||
2531 track->audio.sub_packet_size <= 0 && codec_id != AV_CODEC_ID_SIPR)
2532 return AVERROR_INVALIDDATA;
2533 track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
2534 track->audio.frame_size);
2535 if (!track->audio.buf)
2536 return AVERROR(ENOMEM);
2537 if (codec_id == AV_CODEC_ID_RA_288) {
2538 st->codecpar->block_align = track->audio.coded_framesize;
2539 track->codec_priv.size = 0;
2541 if (codec_id == AV_CODEC_ID_SIPR && flavor < 4) {
2542 static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
2543 track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
2544 st->codecpar->bit_rate = sipr_bit_rate[flavor];
2546 st->codecpar->block_align = track->audio.sub_packet_size;
2547 extradata_offset = 78;
2549 } else if (codec_id == AV_CODEC_ID_FLAC && track->codec_priv.size) {
2550 ret = matroska_parse_flac(s, track, &extradata_offset);
2553 } else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
2554 fourcc = AV_RL32(track->codec_priv.data);
2555 } else if (codec_id == AV_CODEC_ID_VP9 && track->codec_priv.size) {
2556 /* we don't need any value stored in CodecPrivate.
2557 make sure that it's not exported as extradata. */
2558 track->codec_priv.size = 0;
2559 } else if (codec_id == AV_CODEC_ID_AV1 && track->codec_priv.size) {
2560 /* For now, propagate only the OBUs, if any. Once libavcodec is
2561 updated to handle isobmff style extradata this can be removed. */
2562 extradata_offset = 4;
2564 track->codec_priv.size -= extradata_offset;
2566 if (codec_id == AV_CODEC_ID_NONE)
2567 av_log(matroska->ctx, AV_LOG_INFO,
2568 "Unknown/unsupported AVCodecID %s.\n", track->codec_id);
2570 if (track->time_scale < 0.01)
2571 track->time_scale = 1.0;
2572 avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
2573 1000 * 1000 * 1000); /* 64 bit pts in ns */
2575 /* convert the delay from ns to the track timebase */
2576 track->codec_delay_in_track_tb = av_rescale_q(track->codec_delay,
2577 (AVRational){ 1, 1000000000 },
2580 st->codecpar->codec_id = codec_id;
2582 if (strcmp(track->language, "und"))
2583 av_dict_set(&st->metadata, "language", track->language, 0);
2584 av_dict_set(&st->metadata, "title", track->name, 0);
2586 if (track->flag_default)
2587 st->disposition |= AV_DISPOSITION_DEFAULT;
2588 if (track->flag_forced)
2589 st->disposition |= AV_DISPOSITION_FORCED;
2591 if (!st->codecpar->extradata) {
2593 st->codecpar->extradata = extradata;
2594 st->codecpar->extradata_size = extradata_size;
2595 } else if (track->codec_priv.data && track->codec_priv.size > 0) {
2596 if (ff_alloc_extradata(st->codecpar, track->codec_priv.size))
2597 return AVERROR(ENOMEM);
2598 memcpy(st->codecpar->extradata,
2599 track->codec_priv.data + extradata_offset,
2600 track->codec_priv.size);
2604 if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
2605 MatroskaTrackPlane *planes = track->operation.combine_planes.elem;
2606 int display_width_mul = 1;
2607 int display_height_mul = 1;
2609 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
2610 st->codecpar->codec_tag = fourcc;
2612 st->codecpar->bits_per_coded_sample = bit_depth;
2613 st->codecpar->width = track->video.pixel_width;
2614 st->codecpar->height = track->video.pixel_height;
2616 if (track->video.interlaced == MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED)
2617 st->codecpar->field_order = mkv_field_order(matroska, track->video.field_order);
2618 else if (track->video.interlaced == MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE)
2619 st->codecpar->field_order = AV_FIELD_PROGRESSIVE;
2621 if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
2622 mkv_stereo_mode_display_mul(track->video.stereo_mode, &display_width_mul, &display_height_mul);
2624 if (track->video.display_unit < MATROSKA_VIDEO_DISPLAYUNIT_UNKNOWN) {
2625 av_reduce(&st->sample_aspect_ratio.num,
2626 &st->sample_aspect_ratio.den,
2627 st->codecpar->height * track->video.display_width * display_width_mul,
2628 st->codecpar->width * track->video.display_height * display_height_mul,
2631 if (st->codecpar->codec_id != AV_CODEC_ID_HEVC)
2632 st->need_parsing = AVSTREAM_PARSE_HEADERS;
2634 if (track->default_duration) {
2635 av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
2636 1000000000, track->default_duration, 30000);
2637 #if FF_API_R_FRAME_RATE
2638 if ( st->avg_frame_rate.num < st->avg_frame_rate.den * 1000LL
2639 && st->avg_frame_rate.num > st->avg_frame_rate.den * 5LL)
2640 st->r_frame_rate = st->avg_frame_rate;
2644 /* export stereo mode flag as metadata tag */
2645 if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
2646 av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
2648 /* export alpha mode flag as metadata tag */
2649 if (track->video.alpha_mode)
2650 av_dict_set(&st->metadata, "alpha_mode", "1", 0);
2652 /* if we have virtual track, mark the real tracks */
2653 for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
2655 if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
2657 snprintf(buf, sizeof(buf), "%s_%d",
2658 ff_matroska_video_stereo_plane[planes[j].type], i);
2659 for (k=0; k < matroska->tracks.nb_elem; k++)
2660 if (planes[j].uid == tracks[k].uid && tracks[k].stream) {
2661 av_dict_set(&tracks[k].stream->metadata,
2662 "stereo_mode", buf, 0);
2666 // add stream level stereo3d side data if it is a supported format
2667 if (track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
2668 track->video.stereo_mode != 10 && track->video.stereo_mode != 12) {
2669 int ret = ff_mkv_stereo3d_conv(st, track->video.stereo_mode);
2674 ret = mkv_parse_video_color(st, track);
2677 ret = mkv_parse_video_projection(st, track);
2680 } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
2681 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
2682 st->codecpar->codec_tag = fourcc;
2683 st->codecpar->sample_rate = track->audio.out_samplerate;
2684 st->codecpar->channels = track->audio.channels;
2685 if (!st->codecpar->bits_per_coded_sample)
2686 st->codecpar->bits_per_coded_sample = track->audio.bitdepth;
2687 if (st->codecpar->codec_id == AV_CODEC_ID_MP3 ||
2688 st->codecpar->codec_id == AV_CODEC_ID_MLP ||
2689 st->codecpar->codec_id == AV_CODEC_ID_TRUEHD)
2690 st->need_parsing = AVSTREAM_PARSE_FULL;
2691 else if (st->codecpar->codec_id != AV_CODEC_ID_AAC)
2692 st->need_parsing = AVSTREAM_PARSE_HEADERS;
2693 if (track->codec_delay > 0) {
2694 st->codecpar->initial_padding = av_rescale_q(track->codec_delay,
2695 (AVRational){1, 1000000000},
2696 (AVRational){1, st->codecpar->codec_id == AV_CODEC_ID_OPUS ?
2697 48000 : st->codecpar->sample_rate});
2699 if (track->seek_preroll > 0) {
2700 st->codecpar->seek_preroll = av_rescale_q(track->seek_preroll,
2701 (AVRational){1, 1000000000},
2702 (AVRational){1, st->codecpar->sample_rate});
2704 } else if (codec_id == AV_CODEC_ID_WEBVTT) {
2705 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
2707 if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
2708 st->disposition |= AV_DISPOSITION_CAPTIONS;
2709 } else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
2710 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
2711 } else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
2712 st->disposition |= AV_DISPOSITION_METADATA;
2714 } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
2715 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
2722 static int matroska_read_header(AVFormatContext *s)
2724 MatroskaDemuxContext *matroska = s->priv_data;
2725 EbmlList *attachments_list = &matroska->attachments;
2726 EbmlList *chapters_list = &matroska->chapters;
2727 MatroskaAttachment *attachments;
2728 MatroskaChapter *chapters;
2729 uint64_t max_start = 0;
2735 matroska->cues_parsing_deferred = 1;
2737 /* First read the EBML header. */
2738 if (ebml_parse(matroska, ebml_syntax, &ebml) || !ebml.doctype) {
2739 av_log(matroska->ctx, AV_LOG_ERROR, "EBML header parsing failed\n");
2740 ebml_free(ebml_syntax, &ebml);
2741 return AVERROR_INVALIDDATA;
2743 if (ebml.version > EBML_VERSION ||
2744 ebml.max_size > sizeof(uint64_t) ||
2745 ebml.id_length > sizeof(uint32_t) ||
2746 ebml.doctype_version > 3) {
2747 avpriv_report_missing_feature(matroska->ctx,
2748 "EBML version %"PRIu64", doctype %s, doc version %"PRIu64,
2749 ebml.version, ebml.doctype, ebml.doctype_version);
2750 ebml_free(ebml_syntax, &ebml);
2751 return AVERROR_PATCHWELCOME;
2752 } else if (ebml.doctype_version == 3) {
2753 av_log(matroska->ctx, AV_LOG_WARNING,
2754 "EBML header using unsupported features\n"
2755 "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
2756 ebml.version, ebml.doctype, ebml.doctype_version);
2758 for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
2759 if (!strcmp(ebml.doctype, matroska_doctypes[i]))
2761 if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
2762 av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
2763 if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
2764 ebml_free(ebml_syntax, &ebml);
2765 return AVERROR_INVALIDDATA;
2768 ebml_free(ebml_syntax, &ebml);
2770 /* The next thing is a segment. */
2771 pos = avio_tell(matroska->ctx->pb);
2772 res = ebml_parse(matroska, matroska_segments, matroska);
2773 // try resyncing until we find a EBML_STOP type element.
2775 res = matroska_resync(matroska, pos);
2778 pos = avio_tell(matroska->ctx->pb);
2779 res = ebml_parse(matroska, matroska_segment, matroska);
2781 /* Set data_offset as it might be needed later by seek_frame_generic. */
2782 if (matroska->current_id == MATROSKA_ID_CLUSTER)
2783 s->internal->data_offset = avio_tell(matroska->ctx->pb) - 4;
2784 matroska_execute_seekhead(matroska);
2786 if (!matroska->time_scale)
2787 matroska->time_scale = 1000000;
2788 if (matroska->duration)
2789 matroska->ctx->duration = matroska->duration * matroska->time_scale *
2790 1000 / AV_TIME_BASE;
2791 av_dict_set(&s->metadata, "title", matroska->title, 0);
2792 av_dict_set(&s->metadata, "encoder", matroska->muxingapp, 0);
2794 if (matroska->date_utc.size == 8)
2795 matroska_metadata_creation_time(&s->metadata, AV_RB64(matroska->date_utc.data));
2797 res = matroska_parse_tracks(s);
2801 attachments = attachments_list->elem;
2802 for (j = 0; j < attachments_list->nb_elem; j++) {
2803 if (!(attachments[j].filename && attachments[j].mime &&
2804 attachments[j].bin.data && attachments[j].bin.size > 0)) {
2805 av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
2807 AVStream *st = avformat_new_stream(s, NULL);
2810 av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
2811 av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
2812 st->codecpar->codec_id = AV_CODEC_ID_NONE;
2814 for (i = 0; ff_mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2815 if (!strncmp(ff_mkv_image_mime_tags[i].str, attachments[j].mime,
2816 strlen(ff_mkv_image_mime_tags[i].str))) {
2817 st->codecpar->codec_id = ff_mkv_image_mime_tags[i].id;
2822 attachments[j].stream = st;
2824 if (st->codecpar->codec_id != AV_CODEC_ID_NONE) {
2825 AVPacket *pkt = &st->attached_pic;
2827 st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
2828 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
2830 av_init_packet(pkt);
2831 pkt->buf = av_buffer_ref(attachments[j].bin.buf);
2833 return AVERROR(ENOMEM);
2834 pkt->data = attachments[j].bin.data;
2835 pkt->size = attachments[j].bin.size;
2836 pkt->stream_index = st->index;
2837 pkt->flags |= AV_PKT_FLAG_KEY;
2839 st->codecpar->codec_type = AVMEDIA_TYPE_ATTACHMENT;
2840 if (ff_alloc_extradata(st->codecpar, attachments[j].bin.size))
2842 memcpy(st->codecpar->extradata, attachments[j].bin.data,
2843 attachments[j].bin.size);
2845 for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {
2846 if (!strncmp(ff_mkv_mime_tags[i].str, attachments[j].mime,
2847 strlen(ff_mkv_mime_tags[i].str))) {
2848 st->codecpar->codec_id = ff_mkv_mime_tags[i].id;
2856 chapters = chapters_list->elem;
2857 for (i = 0; i < chapters_list->nb_elem; i++)
2858 if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid &&
2859 (max_start == 0 || chapters[i].start > max_start)) {
2860 chapters[i].chapter =
2861 avpriv_new_chapter(s, chapters[i].uid,
2862 (AVRational) { 1, 1000000000 },
2863 chapters[i].start, chapters[i].end,
2865 if (chapters[i].chapter) {
2866 av_dict_set(&chapters[i].chapter->metadata,
2867 "title", chapters[i].title, 0);
2869 max_start = chapters[i].start;
2872 matroska_add_index_entries(matroska);
2874 matroska_convert_tags(s);
2878 matroska_read_close(s);
2883 * Put one packet in an application-supplied AVPacket struct.
2884 * Returns 0 on success or -1 on failure.
2886 static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
2889 if (matroska->queue) {
2890 MatroskaTrack *tracks = matroska->tracks.elem;
2891 MatroskaTrack *track;
2893 ff_packet_list_get(&matroska->queue, &matroska->queue_end, pkt);
2894 track = &tracks[pkt->stream_index];
2895 if (track->has_palette) {
2896 uint8_t *pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
2898 av_log(matroska->ctx, AV_LOG_ERROR, "Cannot append palette to packet\n");
2900 memcpy(pal, track->palette, AVPALETTE_SIZE);
2902 track->has_palette = 0;
2911 * Free all packets in our internal queue.
2913 static void matroska_clear_queue(MatroskaDemuxContext *matroska)
2915 ff_packet_list_free(&matroska->queue, &matroska->queue_end);
2918 static int matroska_parse_laces(MatroskaDemuxContext *matroska, uint8_t **buf,
2919 int *buf_size, int type,
2920 uint32_t **lace_buf, int *laces)
2922 int res = 0, n, size = *buf_size;
2923 uint8_t *data = *buf;
2924 uint32_t *lace_size;
2928 *lace_buf = av_malloc(sizeof(**lace_buf));
2930 return AVERROR(ENOMEM);
2932 *lace_buf[0] = size;
2936 av_assert0(size > 0);
2940 lace_size = av_malloc_array(*laces, sizeof(*lace_size));
2942 return AVERROR(ENOMEM);
2945 case 0x1: /* Xiph lacing */
2949 for (n = 0; res == 0 && n < *laces - 1; n++) {
2953 if (size <= total) {
2954 res = AVERROR_INVALIDDATA;
2959 lace_size[n] += temp;
2966 if (size <= total) {
2967 res = AVERROR_INVALIDDATA;
2971 lace_size[n] = size - total;
2975 case 0x2: /* fixed-size lacing */
2976 if (size % (*laces)) {
2977 res = AVERROR_INVALIDDATA;
2980 for (n = 0; n < *laces; n++)
2981 lace_size[n] = size / *laces;
2984 case 0x3: /* EBML lacing */
2988 n = matroska_ebmlnum_uint(matroska, data, size, &num);
2989 if (n < 0 || num > INT_MAX) {
2990 av_log(matroska->ctx, AV_LOG_INFO,
2991 "EBML block data error\n");
2992 res = n<0 ? n : AVERROR_INVALIDDATA;
2997 total = lace_size[0] = num;
2998 for (n = 1; res == 0 && n < *laces - 1; n++) {
3001 r = matroska_ebmlnum_sint(matroska, data, size, &snum);
3002 if (r < 0 || lace_size[n - 1] + snum > (uint64_t)INT_MAX) {
3003 av_log(matroska->ctx, AV_LOG_INFO,
3004 "EBML block data error\n");
3005 res = r<0 ? r : AVERROR_INVALIDDATA;
3010 lace_size[n] = lace_size[n - 1] + snum;
3011 total += lace_size[n];
3013 if (size <= total) {
3014 res = AVERROR_INVALIDDATA;
3017 lace_size[*laces - 1] = size - total;
3023 *lace_buf = lace_size;
3029 static int matroska_parse_rm_audio(MatroskaDemuxContext *matroska,
3030 MatroskaTrack *track, AVStream *st,
3031 uint8_t *data, int size, uint64_t timecode,
3034 int a = st->codecpar->block_align;
3035 int sps = track->audio.sub_packet_size;
3036 int cfs = track->audio.coded_framesize;
3037 int h = track->audio.sub_packet_h;
3038 int y = track->audio.sub_packet_cnt;
3039 int w = track->audio.frame_size;
3042 if (!track->audio.pkt_cnt) {
3043 if (track->audio.sub_packet_cnt == 0)
3044 track->audio.buf_timecode = timecode;
3045 if (st->codecpar->codec_id == AV_CODEC_ID_RA_288) {
3046 if (size < cfs * h / 2) {
3047 av_log(matroska->ctx, AV_LOG_ERROR,
3048 "Corrupt int4 RM-style audio packet size\n");
3049 return AVERROR_INVALIDDATA;
3051 for (x = 0; x < h / 2; x++)
3052 memcpy(track->audio.buf + x * 2 * w + y * cfs,
3053 data + x * cfs, cfs);
3054 } else if (st->codecpar->codec_id == AV_CODEC_ID_SIPR) {
3056 av_log(matroska->ctx, AV_LOG_ERROR,
3057 "Corrupt sipr RM-style audio packet size\n");
3058 return AVERROR_INVALIDDATA;
3060 memcpy(track->audio.buf + y * w, data, w);
3062 if (size < sps * w / sps || h<=0 || w%sps) {
3063 av_log(matroska->ctx, AV_LOG_ERROR,
3064 "Corrupt generic RM-style audio packet size\n");
3065 return AVERROR_INVALIDDATA;
3067 for (x = 0; x < w / sps; x++)
3068 memcpy(track->audio.buf +
3069 sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)),
3070 data + x * sps, sps);
3073 if (++track->audio.sub_packet_cnt >= h) {
3074 if (st->codecpar->codec_id == AV_CODEC_ID_SIPR)
3075 ff_rm_reorder_sipr_data(track->audio.buf, h, w);
3076 track->audio.sub_packet_cnt = 0;
3077 track->audio.pkt_cnt = h * w / a;
3081 while (track->audio.pkt_cnt) {
3083 AVPacket pktl, *pkt = &pktl;
3085 ret = av_new_packet(pkt, a);
3090 track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--),
3092 pkt->pts = track->audio.buf_timecode;
3093 track->audio.buf_timecode = AV_NOPTS_VALUE;
3095 pkt->stream_index = st->index;
3096 ret = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3098 av_packet_unref(pkt);
3099 return AVERROR(ENOMEM);
3106 /* reconstruct full wavpack blocks from mangled matroska ones */
3107 static int matroska_parse_wavpack(MatroskaTrack *track, uint8_t *src,
3108 uint8_t **pdst, int *size)
3110 uint8_t *dst = NULL;
3115 int ret, offset = 0;
3117 if (srclen < 12 || track->stream->codecpar->extradata_size < 2)
3118 return AVERROR_INVALIDDATA;
3120 ver = AV_RL16(track->stream->codecpar->extradata);
3122 samples = AV_RL32(src);
3126 while (srclen >= 8) {
3131 uint32_t flags = AV_RL32(src);
3132 uint32_t crc = AV_RL32(src + 4);
3136 multiblock = (flags & 0x1800) != 0x1800;
3139 ret = AVERROR_INVALIDDATA;
3142 blocksize = AV_RL32(src);
3148 if (blocksize > srclen) {
3149 ret = AVERROR_INVALIDDATA;
3153 tmp = av_realloc(dst, dstlen + blocksize + 32 + AV_INPUT_BUFFER_PADDING_SIZE);
3155 ret = AVERROR(ENOMEM);
3159 dstlen += blocksize + 32;
3161 AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag
3162 AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8
3163 AV_WL16(dst + offset + 8, ver); // version
3164 AV_WL16(dst + offset + 10, 0); // track/index_no
3165 AV_WL32(dst + offset + 12, 0); // total samples
3166 AV_WL32(dst + offset + 16, 0); // block index
3167 AV_WL32(dst + offset + 20, samples); // number of samples
3168 AV_WL32(dst + offset + 24, flags); // flags
3169 AV_WL32(dst + offset + 28, crc); // crc
3170 memcpy(dst + offset + 32, src, blocksize); // block data
3173 srclen -= blocksize;
3174 offset += blocksize + 32;
3177 memset(dst + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3189 static int matroska_parse_prores(MatroskaTrack *track, uint8_t *src,
3190 uint8_t **pdst, int *size)
3195 if (AV_RB32(&src[4]) != MKBETAG('i', 'c', 'p', 'f')) {
3196 dst = av_malloc(dstlen + 8 + AV_INPUT_BUFFER_PADDING_SIZE);
3198 return AVERROR(ENOMEM);
3200 AV_WB32(dst, dstlen);
3201 AV_WB32(dst + 4, MKBETAG('i', 'c', 'p', 'f'));
3202 memcpy(dst + 8, src, dstlen);
3203 memset(dst + 8 + dstlen, 0, AV_INPUT_BUFFER_PADDING_SIZE);
3213 static int matroska_parse_webvtt(MatroskaDemuxContext *matroska,
3214 MatroskaTrack *track,
3216 uint8_t *data, int data_len,
3221 AVPacket pktl, *pkt = &pktl;
3222 uint8_t *id, *settings, *text, *buf;
3223 int id_len, settings_len, text_len;
3228 return AVERROR_INVALIDDATA;
3231 q = data + data_len;
3236 if (*p == '\r' || *p == '\n') {
3245 if (p >= q || *p != '\n')
3246 return AVERROR_INVALIDDATA;
3252 if (*p == '\r' || *p == '\n') {
3253 settings_len = p - settings;
3261 if (p >= q || *p != '\n')
3262 return AVERROR_INVALIDDATA;
3267 while (text_len > 0) {
3268 const int len = text_len - 1;
3269 const uint8_t c = p[len];
3270 if (c != '\r' && c != '\n')
3276 return AVERROR_INVALIDDATA;
3278 err = av_new_packet(pkt, text_len);
3283 memcpy(pkt->data, text, text_len);
3286 buf = av_packet_new_side_data(pkt,
3287 AV_PKT_DATA_WEBVTT_IDENTIFIER,
3290 av_packet_unref(pkt);
3291 return AVERROR(ENOMEM);
3293 memcpy(buf, id, id_len);
3296 if (settings_len > 0) {
3297 buf = av_packet_new_side_data(pkt,
3298 AV_PKT_DATA_WEBVTT_SETTINGS,
3301 av_packet_unref(pkt);
3302 return AVERROR(ENOMEM);
3304 memcpy(buf, settings, settings_len);
3307 // Do we need this for subtitles?
3308 // pkt->flags = AV_PKT_FLAG_KEY;
3310 pkt->stream_index = st->index;
3311 pkt->pts = timecode;
3313 // Do we need this for subtitles?
3314 // pkt->dts = timecode;
3316 pkt->duration = duration;
3319 err = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3321 av_packet_unref(pkt);
3322 return AVERROR(ENOMEM);
3328 static int matroska_parse_frame(MatroskaDemuxContext *matroska,
3329 MatroskaTrack *track, AVStream *st,
3330 AVBufferRef *buf, uint8_t *data, int pkt_size,
3331 uint64_t timecode, uint64_t lace_duration,
3332 int64_t pos, int is_keyframe,
3333 uint8_t *additional, uint64_t additional_id, int additional_size,
3334 int64_t discard_padding)
3336 MatroskaTrackEncoding *encodings = track->encodings.elem;
3337 uint8_t *pkt_data = data;
3339 AVPacket pktl, *pkt = &pktl;
3341 if (encodings && !encodings->type && encodings->scope & 1) {
3342 res = matroska_decode_buffer(&pkt_data, &pkt_size, track);
3347 if (st->codecpar->codec_id == AV_CODEC_ID_WAVPACK) {
3349 res = matroska_parse_wavpack(track, pkt_data, &wv_data, &pkt_size);
3351 av_log(matroska->ctx, AV_LOG_ERROR,
3352 "Error parsing a wavpack block.\n");
3355 if (pkt_data != data)
3356 av_freep(&pkt_data);
3360 if (st->codecpar->codec_id == AV_CODEC_ID_PRORES) {
3362 res = matroska_parse_prores(track, pkt_data, &pr_data, &pkt_size);
3364 av_log(matroska->ctx, AV_LOG_ERROR,
3365 "Error parsing a prores block.\n");
3368 if (pkt_data != data)
3369 av_freep(&pkt_data);
3373 av_init_packet(pkt);
3374 if (pkt_data != data)
3375 pkt->buf = av_buffer_create(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE,
3378 pkt->buf = av_buffer_ref(buf);
3381 res = AVERROR(ENOMEM);
3385 pkt->data = pkt_data;
3386 pkt->size = pkt_size;
3387 pkt->flags = is_keyframe;
3388 pkt->stream_index = st->index;
3390 if (additional_size > 0) {
3391 uint8_t *side_data = av_packet_new_side_data(pkt,
3392 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
3393 additional_size + 8);
3395 av_packet_unref(pkt);
3396 return AVERROR(ENOMEM);
3398 AV_WB64(side_data, additional_id);
3399 memcpy(side_data + 8, additional, additional_size);
3402 if (discard_padding) {
3403 uint8_t *side_data = av_packet_new_side_data(pkt,
3404 AV_PKT_DATA_SKIP_SAMPLES,
3407 av_packet_unref(pkt);
3408 return AVERROR(ENOMEM);
3410 discard_padding = av_rescale_q(discard_padding,
3411 (AVRational){1, 1000000000},
3412 (AVRational){1, st->codecpar->sample_rate});
3413 if (discard_padding > 0) {
3414 AV_WL32(side_data + 4, discard_padding);
3416 AV_WL32(side_data, -discard_padding);
3420 if (track->ms_compat)
3421 pkt->dts = timecode;
3423 pkt->pts = timecode;
3425 pkt->duration = lace_duration;
3427 #if FF_API_CONVERGENCE_DURATION
3428 FF_DISABLE_DEPRECATION_WARNINGS
3429 if (st->codecpar->codec_id == AV_CODEC_ID_SUBRIP) {
3430 pkt->convergence_duration = lace_duration;
3432 FF_ENABLE_DEPRECATION_WARNINGS
3435 res = ff_packet_list_put(&matroska->queue, &matroska->queue_end, pkt, 0);
3437 av_packet_unref(pkt);
3438 return AVERROR(ENOMEM);
3444 if (pkt_data != data)
3445 av_freep(&pkt_data);
3449 static int matroska_parse_block(MatroskaDemuxContext *matroska, AVBufferRef *buf, uint8_t *data,
3450 int size, int64_t pos, uint64_t cluster_time,
3451 uint64_t block_duration, int is_keyframe,
3452 uint8_t *additional, uint64_t additional_id, int additional_size,
3453 int64_t cluster_pos, int64_t discard_padding)
3455 uint64_t timecode = AV_NOPTS_VALUE;
3456 MatroskaTrack *track;
3460 uint32_t *lace_size = NULL;
3461 int n, flags, laces = 0;
3463 int trust_default_duration = 1;
3465 if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
3471 track = matroska_find_track_by_num(matroska, num);
3472 if (!track || !track->stream) {
3473 av_log(matroska->ctx, AV_LOG_INFO,
3474 "Invalid stream %"PRIu64"\n", num);
3475 return AVERROR_INVALIDDATA;
3476 } else if (size <= 3)
3479 if (st->discard >= AVDISCARD_ALL)
3481 av_assert1(block_duration != AV_NOPTS_VALUE);
3483 block_time = sign_extend(AV_RB16(data), 16);
3487 if (is_keyframe == -1)
3488 is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
3490 if (cluster_time != (uint64_t) -1 &&
3491 (block_time >= 0 || cluster_time >= -block_time)) {
3492 timecode = cluster_time + block_time - track->codec_delay_in_track_tb;
3493 if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE &&
3494 timecode < track->end_timecode)
3495 is_keyframe = 0; /* overlapping subtitles are not key frame */
3497 ff_reduce_index(matroska->ctx, st->index);
3498 av_add_index_entry(st, cluster_pos, timecode, 0, 0,
3503 if (matroska->skip_to_keyframe &&
3504 track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
3505 // Compare signed timecodes. Timecode may be negative due to codec delay
3506 // offset. We don't support timestamps greater than int64_t anyway - see
3508 if ((int64_t)timecode < (int64_t)matroska->skip_to_timecode)
3511 matroska->skip_to_keyframe = 0;
3512 else if (!st->skip_to_keyframe) {
3513 av_log(matroska->ctx, AV_LOG_ERROR, "File is broken, keyframes not correctly marked!\n");
3514 matroska->skip_to_keyframe = 0;
3518 res = matroska_parse_laces(matroska, &data, &size, (flags & 0x06) >> 1,
3519 &lace_size, &laces);
3524 if (track->audio.samplerate == 8000) {
3525 // If this is needed for more codecs, then add them here
3526 if (st->codecpar->codec_id == AV_CODEC_ID_AC3) {
3527 if (track->audio.samplerate != st->codecpar->sample_rate || !st->codecpar->frame_size)
3528 trust_default_duration = 0;
3532 if (!block_duration && trust_default_duration)
3533 block_duration = track->default_duration * laces / matroska->time_scale;
3535 if (cluster_time != (uint64_t)-1 && (block_time >= 0 || cluster_time >= -block_time))
3536 track->end_timecode =
3537 FFMAX(track->end_timecode, timecode + block_duration);
3539 for (n = 0; n < laces; n++) {
3540 int64_t lace_duration = block_duration*(n+1) / laces - block_duration*n / laces;
3542 if (lace_size[n] > size) {
3543 av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
3547 if ((st->codecpar->codec_id == AV_CODEC_ID_RA_288 ||
3548 st->codecpar->codec_id == AV_CODEC_ID_COOK ||
3549 st->codecpar->codec_id == AV_CODEC_ID_SIPR ||
3550 st->codecpar->codec_id == AV_CODEC_ID_ATRAC3) &&
3551 st->codecpar->block_align && track->audio.sub_packet_size) {
3552 res = matroska_parse_rm_audio(matroska, track, st, data,
3558 } else if (st->codecpar->codec_id == AV_CODEC_ID_WEBVTT) {
3559 res = matroska_parse_webvtt(matroska, track, st,
3561 timecode, lace_duration,
3566 res = matroska_parse_frame(matroska, track, st, buf, data, lace_size[n],
3567 timecode, lace_duration, pos,
3568 !n ? is_keyframe : 0,
3569 additional, additional_id, additional_size,
3575 if (timecode != AV_NOPTS_VALUE)
3576 timecode = lace_duration ? timecode + lace_duration : AV_NOPTS_VALUE;
3577 data += lace_size[n];
3578 size -= lace_size[n];
3586 static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
3588 MatroskaCluster *cluster = &matroska->current_cluster;
3589 MatroskaBlock *block = &cluster->block;
3592 av_assert0(matroska->num_levels <= 2);
3594 if (matroska->num_levels == 1) {
3595 res = ebml_parse(matroska, matroska_clusters, NULL);
3598 /* Found a cluster: subtract the size of the ID already read. */
3599 cluster->pos = avio_tell(matroska->ctx->pb) - 4;
3601 res = ebml_parse(matroska, matroska_cluster_enter, cluster);
3607 if (matroska->num_levels == 2) {
3608 /* We are inside a cluster. */
3609 res = ebml_parse(matroska, matroska_cluster_parsing, cluster);
3611 if (res >= 0 && block->bin.size > 0) {
3612 int is_keyframe = block->non_simple ? block->reference == INT64_MIN : -1;
3613 uint8_t* additional = block->additional.size > 0 ?
3614 block->additional.data : NULL;
3616 res = matroska_parse_block(matroska, block->bin.buf, block->bin.data,
3617 block->bin.size, block->bin.pos,
3618 cluster->timecode, block->duration,
3619 is_keyframe, additional, block->additional_id,
3620 block->additional.size, cluster->pos,
3621 block->discard_padding);
3624 ebml_free(matroska_blockgroup, block);
3625 memset(block, 0, sizeof(*block));
3626 } else if (!matroska->num_levels) {
3634 static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
3636 MatroskaDemuxContext *matroska = s->priv_data;
3639 if (matroska->resync_pos == -1) {
3640 // This can only happen if generic seeking has been used.
3641 matroska->resync_pos = avio_tell(s->pb);
3644 while (matroska_deliver_packet(matroska, pkt)) {
3646 return (ret < 0) ? ret : AVERROR_EOF;
3647 if (matroska_parse_cluster(matroska) < 0)
3648 ret = matroska_resync(matroska, matroska->resync_pos);
3654 static int matroska_read_seek(AVFormatContext *s, int stream_index,
3655 int64_t timestamp, int flags)
3657 MatroskaDemuxContext *matroska = s->priv_data;
3658 MatroskaTrack *tracks = NULL;
3659 AVStream *st = s->streams[stream_index];
3662 /* Parse the CUES now since we need the index data to seek. */
3663 if (matroska->cues_parsing_deferred > 0) {
3664 matroska->cues_parsing_deferred = 0;
3665 matroska_parse_cues(matroska);
3668 if (!st->nb_index_entries)
3670 timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
3672 if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3673 matroska_reset_status(matroska, 0, st->index_entries[st->nb_index_entries - 1].pos);
3674 while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0 || index == st->nb_index_entries - 1) {
3675 matroska_clear_queue(matroska);
3676 if (matroska_parse_cluster(matroska) < 0)
3681 matroska_clear_queue(matroska);
3682 if (index < 0 || (matroska->cues_parsing_deferred < 0 && index == st->nb_index_entries - 1))
3685 tracks = matroska->tracks.elem;
3686 for (i = 0; i < matroska->tracks.nb_elem; i++) {
3687 tracks[i].audio.pkt_cnt = 0;
3688 tracks[i].audio.sub_packet_cnt = 0;
3689 tracks[i].audio.buf_timecode = AV_NOPTS_VALUE;
3690 tracks[i].end_timecode = 0;
3693 /* We seek to a level 1 element, so set the appropriate status. */
3694 matroska_reset_status(matroska, 0, st->index_entries[index].pos);
3695 if (flags & AVSEEK_FLAG_ANY) {
3696 st->skip_to_keyframe = 0;
3697 matroska->skip_to_timecode = timestamp;
3699 st->skip_to_keyframe = 1;
3700 matroska->skip_to_timecode = st->index_entries[index].timestamp;
3702 matroska->skip_to_keyframe = 1;
3704 ff_update_cur_dts(s, st, st->index_entries[index].timestamp);
3707 // slightly hackish but allows proper fallback to
3708 // the generic seeking code.
3709 matroska_reset_status(matroska, 0, -1);
3710 matroska->resync_pos = -1;
3711 matroska_clear_queue(matroska);
3712 st->skip_to_keyframe =
3713 matroska->skip_to_keyframe = 0;
3718 static int matroska_read_close(AVFormatContext *s)
3720 MatroskaDemuxContext *matroska = s->priv_data;
3721 MatroskaTrack *tracks = matroska->tracks.elem;
3724 matroska_clear_queue(matroska);
3726 for (n = 0; n < matroska->tracks.nb_elem; n++)
3727 if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
3728 av_freep(&tracks[n].audio.buf);
3729 ebml_free(matroska_segment, matroska);
3735 int64_t start_time_ns;
3736 int64_t end_time_ns;
3737 int64_t start_offset;
3741 /* This function searches all the Cues and returns the CueDesc corresponding to
3742 * the timestamp ts. Returned CueDesc will be such that start_time_ns <= ts <
3743 * end_time_ns. All 4 fields will be set to -1 if ts >= file's duration.
3745 static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start) {
3746 MatroskaDemuxContext *matroska = s->priv_data;
3749 int nb_index_entries = s->streams[0]->nb_index_entries;
3750 AVIndexEntry *index_entries = s->streams[0]->index_entries;
3751 if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
3752 for (i = 1; i < nb_index_entries; i++) {
3753 if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
3754 index_entries[i].timestamp * matroska->time_scale > ts) {
3759 cue_desc.start_time_ns = index_entries[i].timestamp * matroska->time_scale;
3760 cue_desc.start_offset = index_entries[i].pos - matroska->segment_start;
3761 if (i != nb_index_entries - 1) {
3762 cue_desc.end_time_ns = index_entries[i + 1].timestamp * matroska->time_scale;
3763 cue_desc.end_offset = index_entries[i + 1].pos - matroska->segment_start;
3765 cue_desc.end_time_ns = matroska->duration * matroska->time_scale;
3766 // FIXME: this needs special handling for files where Cues appear
3767 // before Clusters. the current logic assumes Cues appear after
3769 cue_desc.end_offset = cues_start - matroska->segment_start;
3774 static int webm_clusters_start_with_keyframe(AVFormatContext *s)
3776 MatroskaDemuxContext *matroska = s->priv_data;
3777 uint32_t id = matroska->current_id;
3778 int64_t cluster_pos, before_pos;
3780 if (s->streams[0]->nb_index_entries <= 0) return 0;
3781 // seek to the first cluster using cues.
3782 index = av_index_search_timestamp(s->streams[0], 0, 0);
3783 if (index < 0) return 0;
3784 cluster_pos = s->streams[0]->index_entries[index].pos;
3785 before_pos = avio_tell(s->pb);
3787 uint64_t cluster_id, cluster_length;
3790 avio_seek(s->pb, cluster_pos, SEEK_SET);
3791 // read cluster id and length
3792 read = ebml_read_num(matroska, matroska->ctx->pb, 4, &cluster_id, 1);
3793 if (read < 0 || cluster_id != 0xF43B675) // done with all clusters
3795 read = ebml_read_length(matroska, matroska->ctx->pb, &cluster_length);
3799 matroska_reset_status(matroska, 0, cluster_pos);
3800 matroska_clear_queue(matroska);
3801 if (matroska_parse_cluster(matroska) < 0 ||
3805 pkt = &matroska->queue->pkt;
3806 // 4 + read is the length of the cluster id and the cluster length field.
3807 cluster_pos += 4 + read + cluster_length;
3808 if (!(pkt->flags & AV_PKT_FLAG_KEY)) {
3814 /* Restore the status after matroska_read_header: */
3815 matroska_reset_status(matroska, id, before_pos);
3820 static int buffer_size_after_time_downloaded(int64_t time_ns, double search_sec, int64_t bps,
3821 double min_buffer, double* buffer,
3822 double* sec_to_download, AVFormatContext *s,
3825 double nano_seconds_per_second = 1000000000.0;
3826 double time_sec = time_ns / nano_seconds_per_second;
3828 int64_t time_to_search_ns = (int64_t)(search_sec * nano_seconds_per_second);
3829 int64_t end_time_ns = time_ns + time_to_search_ns;
3830 double sec_downloaded = 0.0;
3831 CueDesc desc_curr = get_cue_desc(s, time_ns, cues_start);
3832 if (desc_curr.start_time_ns == -1)
3834 *sec_to_download = 0.0;
3836 // Check for non cue start time.
3837 if (time_ns > desc_curr.start_time_ns) {
3838 int64_t cue_nano = desc_curr.end_time_ns - time_ns;
3839 double percent = (double)(cue_nano) / (desc_curr.end_time_ns - desc_curr.start_time_ns);
3840 double cueBytes = (desc_curr.end_offset - desc_curr.start_offset) * percent;
3841 double timeToDownload = (cueBytes * 8.0) / bps;
3843 sec_downloaded += (cue_nano / nano_seconds_per_second) - timeToDownload;
3844 *sec_to_download += timeToDownload;
3846 // Check if the search ends within the first cue.
3847 if (desc_curr.end_time_ns >= end_time_ns) {
3848 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3849 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3850 sec_downloaded = percent_to_sub * sec_downloaded;
3851 *sec_to_download = percent_to_sub * *sec_to_download;
3854 if ((sec_downloaded + *buffer) <= min_buffer) {
3858 // Get the next Cue.
3859 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3862 while (desc_curr.start_time_ns != -1) {
3863 int64_t desc_bytes = desc_curr.end_offset - desc_curr.start_offset;
3864 int64_t desc_ns = desc_curr.end_time_ns - desc_curr.start_time_ns;
3865 double desc_sec = desc_ns / nano_seconds_per_second;
3866 double bits = (desc_bytes * 8.0);
3867 double time_to_download = bits / bps;
3869 sec_downloaded += desc_sec - time_to_download;
3870 *sec_to_download += time_to_download;
3872 if (desc_curr.end_time_ns >= end_time_ns) {
3873 double desc_end_time_sec = desc_curr.end_time_ns / nano_seconds_per_second;
3874 double percent_to_sub = search_sec / (desc_end_time_sec - time_sec);
3875 sec_downloaded = percent_to_sub * sec_downloaded;
3876 *sec_to_download = percent_to_sub * *sec_to_download;
3878 if ((sec_downloaded + *buffer) <= min_buffer)
3883 if ((sec_downloaded + *buffer) <= min_buffer) {
3888 desc_curr = get_cue_desc(s, desc_curr.end_time_ns, cues_start);
3890 *buffer = *buffer + sec_downloaded;
3894 /* This function computes the bandwidth of the WebM file with the help of
3895 * buffer_size_after_time_downloaded() function. Both of these functions are
3896 * adapted from WebM Tools project and are adapted to work with FFmpeg's
3897 * Matroska parsing mechanism.
3899 * Returns the bandwidth of the file on success; -1 on error.
3901 static int64_t webm_dash_manifest_compute_bandwidth(AVFormatContext *s, int64_t cues_start)
3903 MatroskaDemuxContext *matroska = s->priv_data;
3904 AVStream *st = s->streams[0];
3905 double bandwidth = 0.0;
3908 for (i = 0; i < st->nb_index_entries; i++) {
3909 int64_t prebuffer_ns = 1000000000;
3910 int64_t time_ns = st->index_entries[i].timestamp * matroska->time_scale;
3911 double nano_seconds_per_second = 1000000000.0;
3912 int64_t prebuffered_ns = time_ns + prebuffer_ns;
3913 double prebuffer_bytes = 0.0;
3914 int64_t temp_prebuffer_ns = prebuffer_ns;
3915 int64_t pre_bytes, pre_ns;
3916 double pre_sec, prebuffer, bits_per_second;
3917 CueDesc desc_beg = get_cue_desc(s, time_ns, cues_start);
3919 // Start with the first Cue.
3920 CueDesc desc_end = desc_beg;
3922 // Figure out how much data we have downloaded for the prebuffer. This will
3923 // be used later to adjust the bits per sample to try.
3924 while (desc_end.start_time_ns != -1 && desc_end.end_time_ns < prebuffered_ns) {
3925 // Prebuffered the entire Cue.
3926 prebuffer_bytes += desc_end.end_offset - desc_end.start_offset;
3927 temp_prebuffer_ns -= desc_end.end_time_ns - desc_end.start_time_ns;
3928 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
3930 if (desc_end.start_time_ns == -1) {
3931 // The prebuffer is larger than the duration.
3932 if (matroska->duration * matroska->time_scale >= prebuffered_ns)
3934 bits_per_second = 0.0;
3936 // The prebuffer ends in the last Cue. Estimate how much data was
3938 pre_bytes = desc_end.end_offset - desc_end.start_offset;
3939 pre_ns = desc_end.end_time_ns - desc_end.start_time_ns;
3940 pre_sec = pre_ns / nano_seconds_per_second;
3942 pre_bytes * ((temp_prebuffer_ns / nano_seconds_per_second) / pre_sec);
3944 prebuffer = prebuffer_ns / nano_seconds_per_second;
3946 // Set this to 0.0 in case our prebuffer buffers the entire video.
3947 bits_per_second = 0.0;
3949 int64_t desc_bytes = desc_end.end_offset - desc_beg.start_offset;
3950 int64_t desc_ns = desc_end.end_time_ns - desc_beg.start_time_ns;
3951 double desc_sec = desc_ns / nano_seconds_per_second;
3952 double calc_bits_per_second = (desc_bytes * 8) / desc_sec;
3954 // Drop the bps by the percentage of bytes buffered.
3955 double percent = (desc_bytes - prebuffer_bytes) / desc_bytes;
3956 double mod_bits_per_second = calc_bits_per_second * percent;
3958 if (prebuffer < desc_sec) {
3960 (double)(matroska->duration * matroska->time_scale) / nano_seconds_per_second;
3962 // Add 1 so the bits per second should be a little bit greater than file
3964 int64_t bps = (int64_t)(mod_bits_per_second) + 1;
3965 const double min_buffer = 0.0;
3966 double buffer = prebuffer;
3967 double sec_to_download = 0.0;
3969 int rv = buffer_size_after_time_downloaded(prebuffered_ns, search_sec, bps,
3970 min_buffer, &buffer, &sec_to_download,
3974 } else if (rv == 0) {
3975 bits_per_second = (double)(bps);
3980 desc_end = get_cue_desc(s, desc_end.end_time_ns, cues_start);
3981 } while (desc_end.start_time_ns != -1);
3983 if (bandwidth < bits_per_second) bandwidth = bits_per_second;
3985 return (int64_t)bandwidth;
3988 static int webm_dash_manifest_cues(AVFormatContext *s, int64_t init_range)
3990 MatroskaDemuxContext *matroska = s->priv_data;
3991 EbmlList *seekhead_list = &matroska->seekhead;
3992 MatroskaSeekhead *seekhead = seekhead_list->elem;
3994 int64_t cues_start = -1, cues_end = -1, before_pos, bandwidth;
3998 // determine cues start and end positions
3999 for (i = 0; i < seekhead_list->nb_elem; i++)
4000 if (seekhead[i].id == MATROSKA_ID_CUES)
4003 if (i >= seekhead_list->nb_elem) return -1;
4005 before_pos = avio_tell(matroska->ctx->pb);
4006 cues_start = seekhead[i].pos + matroska->segment_start;
4007 if (avio_seek(matroska->ctx->pb, cues_start, SEEK_SET) == cues_start) {
4008 // cues_end is computed as cues_start + cues_length + length of the
4009 // Cues element ID (i.e. 4) + EBML length of the Cues element.
4010 // cues_end is inclusive and the above sum is reduced by 1.
4011 uint64_t cues_length, cues_id;
4013 bytes_read = ebml_read_num (matroska, matroska->ctx->pb, 4, &cues_id, 1);
4014 if (bytes_read < 0 || cues_id != (MATROSKA_ID_CUES & 0xfffffff))
4015 return bytes_read < 0 ? bytes_read : AVERROR_INVALIDDATA;
4016 bytes_read = ebml_read_length(matroska, matroska->ctx->pb, &cues_length);
4019 cues_end = cues_start + 4 + bytes_read + cues_length - 1;
4021 avio_seek(matroska->ctx->pb, before_pos, SEEK_SET);
4022 if (cues_start == -1 || cues_end == -1) return -1;
4025 matroska_parse_cues(matroska);
4028 av_dict_set_int(&s->streams[0]->metadata, CUES_START, cues_start, 0);
4031 av_dict_set_int(&s->streams[0]->metadata, CUES_END, cues_end, 0);
4033 // if the file has cues at the start, fix up the init range so tht
4034 // it does not include it
4035 if (cues_start <= init_range)
4036 av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, cues_start - 1, 0);
4039 bandwidth = webm_dash_manifest_compute_bandwidth(s, cues_start);
4040 if (bandwidth < 0) return -1;
4041 av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH, bandwidth, 0);
4043 // check if all clusters start with key frames
4044 av_dict_set_int(&s->streams[0]->metadata, CLUSTER_KEYFRAME, webm_clusters_start_with_keyframe(s), 0);
4046 // store cue point timestamps as a comma separated list for checking subsegment alignment in
4047 // the muxer. assumes that each timestamp cannot be more than 20 characters long.
4048 buf = av_malloc_array(s->streams[0]->nb_index_entries, 20);
4049 if (!buf) return -1;
4051 for (i = 0; i < s->streams[0]->nb_index_entries; i++) {
4052 int ret = snprintf(buf + end, 20,
4053 "%" PRId64"%s", s->streams[0]->index_entries[i].timestamp,
4054 i != s->streams[0]->nb_index_entries - 1 ? "," : "");
4055 if (ret <= 0 || (ret == 20 && i == s->streams[0]->nb_index_entries - 1)) {
4056 av_log(s, AV_LOG_ERROR, "timestamp too long.\n");
4058 return AVERROR_INVALIDDATA;
4062 av_dict_set(&s->streams[0]->metadata, CUE_TIMESTAMPS, buf, 0);
4068 static int webm_dash_manifest_read_header(AVFormatContext *s)
4071 int ret = matroska_read_header(s);
4073 MatroskaTrack *tracks;
4074 MatroskaDemuxContext *matroska = s->priv_data;
4076 av_log(s, AV_LOG_ERROR, "Failed to read file headers\n");
4079 if (!s->nb_streams) {
4080 matroska_read_close(s);
4081 av_log(s, AV_LOG_ERROR, "No streams found\n");
4082 return AVERROR_INVALIDDATA;
4085 if (!matroska->is_live) {
4086 buf = av_asprintf("%g", matroska->duration);
4087 if (!buf) return AVERROR(ENOMEM);
4088 av_dict_set(&s->streams[0]->metadata, DURATION, buf, 0);
4091 // initialization range
4092 // 5 is the offset of Cluster ID.
4093 init_range = avio_tell(s->pb) - 5;
4094 av_dict_set_int(&s->streams[0]->metadata, INITIALIZATION_RANGE, init_range, 0);
4097 // basename of the file
4098 buf = strrchr(s->url, '/');
4099 av_dict_set(&s->streams[0]->metadata, FILENAME, buf ? ++buf : s->url, 0);
4102 tracks = matroska->tracks.elem;
4103 av_dict_set_int(&s->streams[0]->metadata, TRACK_NUMBER, tracks[0].num, 0);
4105 // parse the cues and populate Cue related fields
4106 if (!matroska->is_live) {
4107 ret = webm_dash_manifest_cues(s, init_range);
4109 av_log(s, AV_LOG_ERROR, "Error parsing Cues\n");
4114 // use the bandwidth from the command line if it was provided
4115 if (matroska->bandwidth > 0) {
4116 av_dict_set_int(&s->streams[0]->metadata, BANDWIDTH,
4117 matroska->bandwidth, 0);
4122 static int webm_dash_manifest_read_packet(AVFormatContext *s, AVPacket *pkt)
4127 #define OFFSET(x) offsetof(MatroskaDemuxContext, x)
4128 static const AVOption options[] = {
4129 { "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 },
4130 { "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 },
4134 static const AVClass webm_dash_class = {
4135 .class_name = "WebM DASH Manifest demuxer",
4136 .item_name = av_default_item_name,
4138 .version = LIBAVUTIL_VERSION_INT,
4141 AVInputFormat ff_matroska_demuxer = {
4142 .name = "matroska,webm",
4143 .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"),
4144 .extensions = "mkv,mk3d,mka,mks",
4145 .priv_data_size = sizeof(MatroskaDemuxContext),
4146 .read_probe = matroska_probe,
4147 .read_header = matroska_read_header,
4148 .read_packet = matroska_read_packet,
4149 .read_close = matroska_read_close,
4150 .read_seek = matroska_read_seek,
4151 .mime_type = "audio/webm,audio/x-matroska,video/webm,video/x-matroska"
4154 AVInputFormat ff_webm_dash_manifest_demuxer = {
4155 .name = "webm_dash_manifest",
4156 .long_name = NULL_IF_CONFIG_SMALL("WebM DASH Manifest"),
4157 .priv_data_size = sizeof(MatroskaDemuxContext),
4158 .read_header = webm_dash_manifest_read_header,
4159 .read_packet = webm_dash_manifest_read_packet,
4160 .read_close = matroska_read_close,
4161 .priv_class = &webm_dash_class,