/* * Matroska file demuxer * Copyright (c) 2003-2008 The Libav Project * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * Matroska file demuxer * @author Ronald Bultje * @author with a little help from Moritz Bunkus * @author totally reworked by Aurelien Jacobs * @see specs available on the Matroska project page: http://www.matroska.org/ */ #include "config.h" #include #if CONFIG_BZLIB #include #endif #if CONFIG_ZLIB #include #endif #include "libavutil/avstring.h" #include "libavutil/dict.h" #include "libavutil/intfloat.h" #include "libavutil/intreadwrite.h" #include "libavutil/lzo.h" #include "libavcodec/bytestream.h" #include "libavcodec/mpeg4audio.h" #include "avformat.h" #include "avio_internal.h" #include "internal.h" #include "isom.h" #include "matroska.h" /* For ff_codec_get_id(). */ #include "riff.h" #include "rmsipr.h" typedef enum { EBML_NONE, EBML_UINT, EBML_FLOAT, EBML_STR, EBML_UTF8, EBML_BIN, EBML_NEST, EBML_PASS, EBML_STOP, EBML_TYPE_COUNT } EbmlType; typedef const struct EbmlSyntax { uint32_t id; EbmlType type; int list_elem_size; int data_offset; union { uint64_t u; double f; const char *s; const struct EbmlSyntax *n; } def; } EbmlSyntax; typedef struct { int nb_elem; void *elem; } EbmlList; typedef struct { int size; uint8_t *data; int64_t pos; } EbmlBin; typedef struct { uint64_t version; uint64_t max_size; uint64_t id_length; char *doctype; uint64_t doctype_version; } Ebml; typedef struct { uint64_t algo; EbmlBin settings; } MatroskaTrackCompression; typedef struct { uint64_t scope; uint64_t type; MatroskaTrackCompression compression; } MatroskaTrackEncoding; typedef struct { double frame_rate; uint64_t display_width; uint64_t display_height; uint64_t pixel_width; uint64_t pixel_height; uint64_t fourcc; } MatroskaTrackVideo; typedef struct { double samplerate; double out_samplerate; uint64_t bitdepth; uint64_t channels; /* real audio header (extracted from extradata) */ int coded_framesize; int sub_packet_h; int frame_size; int sub_packet_size; int sub_packet_cnt; int pkt_cnt; uint64_t buf_timecode; uint8_t *buf; } MatroskaTrackAudio; typedef struct { uint64_t num; uint64_t uid; uint64_t type; char *name; char *codec_id; EbmlBin codec_priv; char *language; double time_scale; uint64_t default_duration; uint64_t flag_default; uint64_t flag_forced; MatroskaTrackVideo video; MatroskaTrackAudio audio; EbmlList encodings; AVStream *stream; int64_t end_timecode; int ms_compat; } MatroskaTrack; typedef struct { uint64_t uid; char *filename; char *mime; EbmlBin bin; AVStream *stream; } MatroskaAttachment; typedef struct { uint64_t start; uint64_t end; uint64_t uid; char *title; AVChapter *chapter; } MatroskaChapter; typedef struct { uint64_t track; uint64_t pos; } MatroskaIndexPos; typedef struct { uint64_t time; EbmlList pos; } MatroskaIndex; typedef struct { char *name; char *string; char *lang; uint64_t def; EbmlList sub; } MatroskaTag; typedef struct { char *type; uint64_t typevalue; uint64_t trackuid; uint64_t chapteruid; uint64_t attachuid; } MatroskaTagTarget; typedef struct { MatroskaTagTarget target; EbmlList tag; } MatroskaTags; typedef struct { uint64_t id; uint64_t pos; } MatroskaSeekhead; typedef struct { uint64_t start; uint64_t length; } MatroskaLevel; typedef struct { uint64_t timecode; EbmlList blocks; } MatroskaCluster; typedef struct { AVFormatContext *ctx; /* EBML stuff */ int num_levels; MatroskaLevel levels[EBML_MAX_DEPTH]; int level_up; uint32_t current_id; uint64_t time_scale; double duration; char *title; EbmlList tracks; EbmlList attachments; EbmlList chapters; EbmlList index; EbmlList tags; EbmlList seekhead; /* byte position of the segment inside the stream */ int64_t segment_start; /* the packet queue */ AVPacket **packets; int num_packets; AVPacket *prev_pkt; int done; /* What to skip before effectively reading a packet. */ int skip_to_keyframe; uint64_t skip_to_timecode; /* File has a CUES element, but we defer parsing until it is needed. */ int cues_parsing_deferred; int current_cluster_num_blocks; int64_t current_cluster_pos; MatroskaCluster current_cluster; /* File has SSA subtitles which prevent incremental cluster parsing. */ int contains_ssa; } MatroskaDemuxContext; typedef struct { uint64_t duration; int64_t reference; uint64_t non_simple; EbmlBin bin; } MatroskaBlock; static EbmlSyntax ebml_header[] = { { EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml, version), { .u = EBML_VERSION } }, { EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml, max_size), { .u = 8 } }, { EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml, id_length), { .u = 4 } }, { EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml, doctype), { .s = "(none)" } }, { EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml, doctype_version), { .u = 1 } }, { EBML_ID_EBMLVERSION, EBML_NONE }, { EBML_ID_DOCTYPEVERSION, EBML_NONE }, { 0 } }; static EbmlSyntax ebml_syntax[] = { { EBML_ID_HEADER, EBML_NEST, 0, 0, { .n = ebml_header } }, { 0 } }; static EbmlSyntax matroska_info[] = { { MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } }, { MATROSKA_ID_DURATION, EBML_FLOAT, 0, offsetof(MatroskaDemuxContext, duration) }, { MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext, title) }, { MATROSKA_ID_WRITINGAPP, EBML_NONE }, { MATROSKA_ID_MUXINGAPP, EBML_NONE }, { MATROSKA_ID_DATEUTC, EBML_NONE }, { MATROSKA_ID_SEGMENTUID, EBML_NONE }, { 0 } }; static EbmlSyntax matroska_track_video[] = { { MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT, 0, offsetof(MatroskaTrackVideo, frame_rate) }, { MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_width) }, { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_height) }, { MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_width) }, { MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, pixel_height) }, { MATROSKA_ID_VIDEOCOLORSPACE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, fourcc) }, { MATROSKA_ID_VIDEOPIXELCROPB, EBML_NONE }, { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE }, { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE }, { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE }, { MATROSKA_ID_VIDEODISPLAYUNIT, EBML_NONE }, { MATROSKA_ID_VIDEOFLAGINTERLACED, EBML_NONE }, { MATROSKA_ID_VIDEOSTEREOMODE, EBML_NONE }, { MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE }, { 0 } }; static EbmlSyntax matroska_track_audio[] = { { MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } }, { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, offsetof(MatroskaTrackAudio, out_samplerate) }, { MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio, bitdepth) }, { MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio, channels), { .u = 1 } }, { 0 } }; static EbmlSyntax matroska_track_encoding_compression[] = { { MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, offsetof(MatroskaTrackCompression, algo), { .u = 0 } }, { MATROSKA_ID_ENCODINGCOMPSETTINGS, EBML_BIN, 0, offsetof(MatroskaTrackCompression, settings) }, { 0 } }; static EbmlSyntax matroska_track_encoding[] = { { MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, scope), { .u = 1 } }, { MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding, type), { .u = 0 } }, { MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } }, { MATROSKA_ID_ENCODINGORDER, EBML_NONE }, { 0 } }; static EbmlSyntax matroska_track_encodings[] = { { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } }, { 0 } }; static EbmlSyntax matroska_track[] = { { MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack, num) }, { MATROSKA_ID_TRACKNAME, EBML_UTF8, 0, offsetof(MatroskaTrack, name) }, { MATROSKA_ID_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTrack, uid) }, { MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, offsetof(MatroskaTrack, type) }, { MATROSKA_ID_CODECID, EBML_STR, 0, offsetof(MatroskaTrack, codec_id) }, { MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack, codec_priv) }, { MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack, language), { .s = "eng" } }, { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack, default_duration) }, { MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } }, { MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack, flag_default), { .u = 1 } }, { MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } }, { MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } }, { MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } }, { MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST, 0, 0, { .n = matroska_track_encodings } }, { MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE }, { MATROSKA_ID_TRACKFLAGLACING, EBML_NONE }, { MATROSKA_ID_CODECNAME, EBML_NONE }, { MATROSKA_ID_CODECDECODEALL, EBML_NONE }, { MATROSKA_ID_CODECINFOURL, EBML_NONE }, { MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE }, { MATROSKA_ID_TRACKMINCACHE, EBML_NONE }, { MATROSKA_ID_TRACKMAXCACHE, EBML_NONE }, { MATROSKA_ID_TRACKMAXBLKADDID, EBML_NONE }, { 0 } }; static EbmlSyntax matroska_tracks[] = { { MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } }, { 0 } }; static EbmlSyntax matroska_attachment[] = { { MATROSKA_ID_FILEUID, EBML_UINT, 0, offsetof(MatroskaAttachment, uid) }, { MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachment, filename) }, { MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachment, mime) }, { MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachment, bin) }, { MATROSKA_ID_FILEDESC, EBML_NONE }, { 0 } }; static EbmlSyntax matroska_attachments[] = { { MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } }, { 0 } }; static EbmlSyntax matroska_chapter_display[] = { { MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter, title) }, { MATROSKA_ID_CHAPLANG, EBML_NONE }, { 0 } }; static EbmlSyntax matroska_chapter_entry[] = { { MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, offsetof(MatroskaChapter, start), { .u = AV_NOPTS_VALUE } }, { MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, offsetof(MatroskaChapter, end), { .u = AV_NOPTS_VALUE } }, { MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaChapter, uid) }, { MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, { .n = matroska_chapter_display } }, { MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE }, { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE }, { MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE }, { MATROSKA_ID_CHAPTERATOM, EBML_NONE }, { 0 } }; static EbmlSyntax matroska_chapter[] = { { MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } }, { MATROSKA_ID_EDITIONUID, EBML_NONE }, { MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE }, { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE }, { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE }, { 0 } }; static EbmlSyntax matroska_chapters[] = { { MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, { .n = matroska_chapter } }, { 0 } }; static EbmlSyntax matroska_index_pos[] = { { MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos, track) }, { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos, pos) }, { MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE }, { 0 } }; static EbmlSyntax matroska_index_entry[] = { { MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex, time) }, { MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } }, { 0 } }; static EbmlSyntax matroska_index[] = { { MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } }, { 0 } }; static EbmlSyntax matroska_simpletag[] = { { MATROSKA_ID_TAGNAME, EBML_UTF8, 0, offsetof(MatroskaTag, name) }, { MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, offsetof(MatroskaTag, string) }, { MATROSKA_ID_TAGLANG, EBML_STR, 0, offsetof(MatroskaTag, lang), { .s = "und" } }, { MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTag, def) }, { MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0, offsetof(MatroskaTag, def) }, { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag, sub), { .n = matroska_simpletag } }, { 0 } }; static EbmlSyntax matroska_tagtargets[] = { { MATROSKA_ID_TAGTARGETS_TYPE, EBML_STR, 0, offsetof(MatroskaTagTarget, type) }, { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } }, { MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, trackuid) }, { MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, chapteruid) }, { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget, attachuid) }, { 0 } }; static EbmlSyntax matroska_tag[] = { { MATROSKA_ID_SIMPLETAG, EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags, tag), { .n = matroska_simpletag } }, { MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, offsetof(MatroskaTags, target), { .n = matroska_tagtargets } }, { 0 } }; static EbmlSyntax matroska_tags[] = { { MATROSKA_ID_TAG, EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } }, { 0 } }; static EbmlSyntax matroska_seekhead_entry[] = { { MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead, id) }, { MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } }, { 0 } }; static EbmlSyntax matroska_seekhead[] = { { MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } }, { 0 } }; static EbmlSyntax matroska_segment[] = { { MATROSKA_ID_INFO, EBML_NEST, 0, 0, { .n = matroska_info } }, { MATROSKA_ID_TRACKS, EBML_NEST, 0, 0, { .n = matroska_tracks } }, { MATROSKA_ID_ATTACHMENTS, EBML_NEST, 0, 0, { .n = matroska_attachments } }, { MATROSKA_ID_CHAPTERS, EBML_NEST, 0, 0, { .n = matroska_chapters } }, { MATROSKA_ID_CUES, EBML_NEST, 0, 0, { .n = matroska_index } }, { MATROSKA_ID_TAGS, EBML_NEST, 0, 0, { .n = matroska_tags } }, { MATROSKA_ID_SEEKHEAD, EBML_NEST, 0, 0, { .n = matroska_seekhead } }, { MATROSKA_ID_CLUSTER, EBML_STOP }, { 0 } }; static EbmlSyntax matroska_segments[] = { { MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, { .n = matroska_segment } }, { 0 } }; static EbmlSyntax matroska_blockgroup[] = { { MATROSKA_ID_BLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) }, { MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, offsetof(MatroskaBlock, bin) }, { MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, offsetof(MatroskaBlock, duration), { .u = AV_NOPTS_VALUE } }, { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock, reference) }, { MATROSKA_ID_CODECSTATE, EBML_NONE }, { 1, EBML_UINT, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } }, { 0 } }; static EbmlSyntax matroska_cluster[] = { { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) }, { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } }, { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } }, { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE }, { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE }, { 0 } }; static EbmlSyntax matroska_clusters[] = { { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = matroska_cluster } }, { MATROSKA_ID_INFO, EBML_NONE }, { MATROSKA_ID_CUES, EBML_NONE }, { MATROSKA_ID_TAGS, EBML_NONE }, { MATROSKA_ID_SEEKHEAD, EBML_NONE }, { 0 } }; static EbmlSyntax matroska_cluster_incremental_parsing[] = { { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) }, { MATROSKA_ID_BLOCKGROUP, EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } }, { MATROSKA_ID_SIMPLEBLOCK, EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster, blocks), { .n = matroska_blockgroup } }, { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE }, { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE }, { MATROSKA_ID_INFO, EBML_NONE }, { MATROSKA_ID_CUES, EBML_NONE }, { MATROSKA_ID_TAGS, EBML_NONE }, { MATROSKA_ID_SEEKHEAD, EBML_NONE }, { MATROSKA_ID_CLUSTER, EBML_STOP }, { 0 } }; static EbmlSyntax matroska_cluster_incremental[] = { { MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, offsetof(MatroskaCluster, timecode) }, { MATROSKA_ID_BLOCKGROUP, EBML_STOP }, { MATROSKA_ID_SIMPLEBLOCK, EBML_STOP }, { MATROSKA_ID_CLUSTERPOSITION, EBML_NONE }, { MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE }, { 0 } }; static EbmlSyntax matroska_clusters_incremental[] = { { MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, { .n = matroska_cluster_incremental } }, { MATROSKA_ID_INFO, EBML_NONE }, { MATROSKA_ID_CUES, EBML_NONE }, { MATROSKA_ID_TAGS, EBML_NONE }, { MATROSKA_ID_SEEKHEAD, EBML_NONE }, { 0 } }; static const char *const matroska_doctypes[] = { "matroska", "webm" }; static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos) { AVIOContext *pb = matroska->ctx->pb; uint32_t id; matroska->current_id = 0; matroska->num_levels = 0; /* seek to next position to resync from */ if (avio_seek(pb, last_pos + 1, SEEK_SET) < 0) goto eof; id = avio_rb32(pb); // try to find a toplevel element while (!pb->eof_reached) { if (id == MATROSKA_ID_INFO || id == MATROSKA_ID_TRACKS || id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS || id == MATROSKA_ID_SEEKHEAD || id == MATROSKA_ID_ATTACHMENTS || id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) { matroska->current_id = id; return 0; } id = (id << 8) | avio_r8(pb); } eof: matroska->done = 1; return AVERROR_EOF; } /* * Return: Whether we reached the end of a level in the hierarchy or not. */ static int ebml_level_end(MatroskaDemuxContext *matroska) { AVIOContext *pb = matroska->ctx->pb; int64_t pos = avio_tell(pb); if (matroska->num_levels > 0) { MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1]; if (pos - level->start >= level->length || matroska->current_id) { matroska->num_levels--; return 1; } } return 0; } /* * Read: an "EBML number", which is defined as a variable-length * array of bytes. The first byte indicates the length by giving a * number of 0-bits followed by a one. The position of the first * "one" bit inside the first byte indicates the length of this * number. * Returns: number of bytes read, < 0 on error */ static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb, int max_size, uint64_t *number) { int read = 1, n = 1; uint64_t total = 0; /* The first byte tells us the length in bytes - avio_r8() can normally * return 0, but since that's not a valid first ebmlID byte, we can * use it safely here to catch EOS. */ if (!(total = avio_r8(pb))) { /* we might encounter EOS here */ if (!pb->eof_reached) { int64_t pos = avio_tell(pb); av_log(matroska->ctx, AV_LOG_ERROR, "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos); return pb->error ? pb->error : AVERROR(EIO); } return AVERROR_EOF; } /* get the length of the EBML number */ read = 8 - ff_log2_tab[total]; if (read > max_size) { int64_t pos = avio_tell(pb) - 1; av_log(matroska->ctx, AV_LOG_ERROR, "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n", (uint8_t) total, pos, pos); return AVERROR_INVALIDDATA; } /* read out length */ total ^= 1 << ff_log2_tab[total]; while (n++ < read) total = (total << 8) | avio_r8(pb); *number = total; return read; } /** * Read a EBML length value. * This needs special handling for the "unknown length" case which has multiple * encodings. */ static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb, uint64_t *number) { int res = ebml_read_num(matroska, pb, 8, number); if (res > 0 && *number + 1 == 1ULL << (7 * res)) *number = 0xffffffffffffffULL; return res; } /* * Read the next element as an unsigned int. * 0 is success, < 0 is failure. */ static int ebml_read_uint(AVIOContext *pb, int size, uint64_t *num) { int n = 0; if (size > 8) return AVERROR_INVALIDDATA; /* big-endian ordering; build up number */ *num = 0; while (n++ < size) *num = (*num << 8) | avio_r8(pb); return 0; } /* * Read the next element as a float. * 0 is success, < 0 is failure. */ static int ebml_read_float(AVIOContext *pb, int size, double *num) { if (size == 0) *num = 0; else if (size == 4) *num = av_int2float(avio_rb32(pb)); else if (size == 8) *num = av_int2double(avio_rb64(pb)); else return AVERROR_INVALIDDATA; return 0; } /* * Read the next element as an ASCII string. * 0 is success, < 0 is failure. */ static int ebml_read_ascii(AVIOContext *pb, int size, char **str) { char *res; /* EBML strings are usually not 0-terminated, so we allocate one * byte more, read the string and NULL-terminate it ourselves. */ if (!(res = av_malloc(size + 1))) return AVERROR(ENOMEM); if (avio_read(pb, (uint8_t *) res, size) != size) { av_free(res); return AVERROR(EIO); } (res)[size] = '\0'; av_free(*str); *str = res; return 0; } /* * Read the next element as binary data. * 0 is success, < 0 is failure. */ static int ebml_read_binary(AVIOContext *pb, int length, EbmlBin *bin) { av_free(bin->data); if (!(bin->data = av_malloc(length + FF_INPUT_BUFFER_PADDING_SIZE))) return AVERROR(ENOMEM); memset(bin->data + length, 0, FF_INPUT_BUFFER_PADDING_SIZE); bin->size = length; bin->pos = avio_tell(pb); if (avio_read(pb, bin->data, length) != length) { av_freep(&bin->data); return AVERROR(EIO); } return 0; } /* * Read the next element, but only the header. The contents * are supposed to be sub-elements which can be read separately. * 0 is success, < 0 is failure. */ static int ebml_read_master(MatroskaDemuxContext *matroska, uint64_t length) { AVIOContext *pb = matroska->ctx->pb; MatroskaLevel *level; if (matroska->num_levels >= EBML_MAX_DEPTH) { av_log(matroska->ctx, AV_LOG_ERROR, "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH); return AVERROR(ENOSYS); } level = &matroska->levels[matroska->num_levels++]; level->start = avio_tell(pb); level->length = length; return 0; } /* * Read signed/unsigned "EBML" numbers. * Return: number of bytes processed, < 0 on error */ static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska, uint8_t *data, uint32_t size, uint64_t *num) { AVIOContext pb; ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL); return ebml_read_num(matroska, &pb, FFMIN(size, 8), num); } /* * Same as above, but signed. */ static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska, uint8_t *data, uint32_t size, int64_t *num) { uint64_t unum; int res; /* read as unsigned number first */ if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0) return res; /* make signed (weird way) */ *num = unum - ((1LL << (7 * res - 1)) - 1); return res; } static int ebml_parse_elem(MatroskaDemuxContext *matroska, EbmlSyntax *syntax, void *data); static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax, uint32_t id, void *data) { int i; for (i = 0; syntax[i].id; i++) if (id == syntax[i].id) break; if (!syntax[i].id && id == MATROSKA_ID_CLUSTER && matroska->num_levels > 0 && matroska->levels[matroska->num_levels - 1].length == 0xffffffffffffff) return 0; // we reached the end of an unknown size cluster if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32) { av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id); if (matroska->ctx->error_recognition & AV_EF_EXPLODE) return AVERROR_INVALIDDATA; } return ebml_parse_elem(matroska, &syntax[i], data); } static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax, void *data) { if (!matroska->current_id) { uint64_t id; int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id); if (res < 0) return res; matroska->current_id = id | 1 << 7 * res; } return ebml_parse_id(matroska, syntax, matroska->current_id, data); } static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax, void *data) { int i, res = 0; for (i = 0; syntax[i].id; i++) switch (syntax[i].type) { case EBML_UINT: *(uint64_t *) ((char *) data + syntax[i].data_offset) = syntax[i].def.u; break; case EBML_FLOAT: *(double *) ((char *) data + syntax[i].data_offset) = syntax[i].def.f; break; case EBML_STR: case EBML_UTF8: // the default may be NULL if (syntax[i].def.s) { uint8_t **dst = (uint8_t **) ((uint8_t *) data + syntax[i].data_offset); *dst = av_strdup(syntax[i].def.s); if (!*dst) return AVERROR(ENOMEM); } break; } while (!res && !ebml_level_end(matroska)) res = ebml_parse(matroska, syntax, data); return res; } static int ebml_parse_elem(MatroskaDemuxContext *matroska, EbmlSyntax *syntax, void *data) { static const uint64_t max_lengths[EBML_TYPE_COUNT] = { [EBML_UINT] = 8, [EBML_FLOAT] = 8, // max. 16 MB for strings [EBML_STR] = 0x1000000, [EBML_UTF8] = 0x1000000, // max. 256 MB for binary data [EBML_BIN] = 0x10000000, // no limits for anything else }; AVIOContext *pb = matroska->ctx->pb; uint32_t id = syntax->id; uint64_t length; int res; data = (char *) data + syntax->data_offset; if (syntax->list_elem_size) { EbmlList *list = data; if ((res = av_reallocp_array(&list->elem, list->nb_elem + 1, syntax->list_elem_size)) < 0) { list->nb_elem = 0; return res; } data = (char *) list->elem + list->nb_elem * syntax->list_elem_size; memset(data, 0, syntax->list_elem_size); list->nb_elem++; } if (syntax->type != EBML_PASS && syntax->type != EBML_STOP) { matroska->current_id = 0; if ((res = ebml_read_length(matroska, pb, &length)) < 0) return res; if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) { av_log(matroska->ctx, AV_LOG_ERROR, "Invalid length 0x%"PRIx64" > 0x%"PRIx64" for syntax element %i\n", length, max_lengths[syntax->type], syntax->type); return AVERROR_INVALIDDATA; } } switch (syntax->type) { case EBML_UINT: res = ebml_read_uint(pb, length, data); break; case EBML_FLOAT: res = ebml_read_float(pb, length, data); break; case EBML_STR: case EBML_UTF8: res = ebml_read_ascii(pb, length, data); break; case EBML_BIN: res = ebml_read_binary(pb, length, data); break; case EBML_NEST: if ((res = ebml_read_master(matroska, length)) < 0) return res; if (id == MATROSKA_ID_SEGMENT) matroska->segment_start = avio_tell(matroska->ctx->pb); return ebml_parse_nest(matroska, syntax->def.n, data); case EBML_PASS: return ebml_parse_id(matroska, syntax->def.n, id, data); case EBML_STOP: return 1; default: return avio_skip(pb, length) < 0 ? AVERROR(EIO) : 0; } if (res == AVERROR_INVALIDDATA) av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n"); else if (res == AVERROR(EIO)) av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n"); return res; } static void ebml_free(EbmlSyntax *syntax, void *data) { int i, j; for (i = 0; syntax[i].id; i++) { void *data_off = (char *) data + syntax[i].data_offset; switch (syntax[i].type) { case EBML_STR: case EBML_UTF8: av_freep(data_off); break; case EBML_BIN: av_freep(&((EbmlBin *) data_off)->data); break; case EBML_NEST: if (syntax[i].list_elem_size) { EbmlList *list = data_off; char *ptr = list->elem; for (j = 0; j < list->nb_elem; j++, ptr += syntax[i].list_elem_size) ebml_free(syntax[i].def.n, ptr); av_free(list->elem); } else ebml_free(syntax[i].def.n, data_off); default: break; } } } /* * Autodetecting... */ static int matroska_probe(AVProbeData *p) { uint64_t total = 0; int len_mask = 0x80, size = 1, n = 1, i; /* EBML header? */ if (AV_RB32(p->buf) != EBML_ID_HEADER) return 0; /* length of header */ total = p->buf[4]; while (size <= 8 && !(total & len_mask)) { size++; len_mask >>= 1; } if (size > 8) return 0; total &= (len_mask - 1); while (n < size) total = (total << 8) | p->buf[4 + n++]; /* Does the probe data contain the whole header? */ if (p->buf_size < 4 + size + total) return 0; /* The header should contain a known document type. For now, * we don't parse the whole header but simply check for the * availability of that array of characters inside the header. * Not fully fool-proof, but good enough. */ for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) { int probelen = strlen(matroska_doctypes[i]); if (total < probelen) continue; for (n = 4 + size; n <= 4 + size + total - probelen; n++) if (!memcmp(p->buf + n, matroska_doctypes[i], probelen)) return AVPROBE_SCORE_MAX; } // probably valid EBML header but no recognized doctype return AVPROBE_SCORE_EXTENSION; } static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska, int num) { MatroskaTrack *tracks = matroska->tracks.elem; int i; for (i = 0; i < matroska->tracks.nb_elem; i++) if (tracks[i].num == num) return &tracks[i]; av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num); return NULL; } static int matroska_decode_buffer(uint8_t **buf, int *buf_size, MatroskaTrack *track) { MatroskaTrackEncoding *encodings = track->encodings.elem; uint8_t *data = *buf; int isize = *buf_size; uint8_t *pkt_data = NULL; uint8_t av_unused *newpktdata; int pkt_size = isize; int result = 0; int olen; if (pkt_size >= 10000000) return AVERROR_INVALIDDATA; switch (encodings[0].compression.algo) { case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP: { int header_size = encodings[0].compression.settings.size; uint8_t *header = encodings[0].compression.settings.data; if (!header_size) return 0; pkt_size = isize + header_size; pkt_data = av_malloc(pkt_size); if (!pkt_data) return AVERROR(ENOMEM); memcpy(pkt_data, header, header_size); memcpy(pkt_data + header_size, data, isize); break; } #if CONFIG_LZO case MATROSKA_TRACK_ENCODING_COMP_LZO: do { olen = pkt_size *= 3; newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING); if (!newpktdata) { result = AVERROR(ENOMEM); goto failed; } pkt_data = newpktdata; result = av_lzo1x_decode(pkt_data, &olen, data, &isize); } while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000); if (result) { result = AVERROR_INVALIDDATA; goto failed; } pkt_size -= olen; break; #endif #if CONFIG_ZLIB case MATROSKA_TRACK_ENCODING_COMP_ZLIB: { z_stream zstream = { 0 }; if (inflateInit(&zstream) != Z_OK) return -1; zstream.next_in = data; zstream.avail_in = isize; do { pkt_size *= 3; newpktdata = av_realloc(pkt_data, pkt_size); if (!newpktdata) { inflateEnd(&zstream); goto failed; } pkt_data = newpktdata; zstream.avail_out = pkt_size - zstream.total_out; zstream.next_out = pkt_data + zstream.total_out; result = inflate(&zstream, Z_NO_FLUSH); } while (result == Z_OK && pkt_size < 10000000); pkt_size = zstream.total_out; inflateEnd(&zstream); if (result != Z_STREAM_END) { if (result == Z_MEM_ERROR) result = AVERROR(ENOMEM); else result = AVERROR_INVALIDDATA; goto failed; } break; } #endif #if CONFIG_BZLIB case MATROSKA_TRACK_ENCODING_COMP_BZLIB: { bz_stream bzstream = { 0 }; if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK) return -1; bzstream.next_in = data; bzstream.avail_in = isize; do { pkt_size *= 3; newpktdata = av_realloc(pkt_data, pkt_size); if (!newpktdata) { BZ2_bzDecompressEnd(&bzstream); goto failed; } pkt_data = newpktdata; bzstream.avail_out = pkt_size - bzstream.total_out_lo32; bzstream.next_out = pkt_data + bzstream.total_out_lo32; result = BZ2_bzDecompress(&bzstream); } while (result == BZ_OK && pkt_size < 10000000); pkt_size = bzstream.total_out_lo32; BZ2_bzDecompressEnd(&bzstream); if (result != BZ_STREAM_END) { if (result == BZ_MEM_ERROR) result = AVERROR(ENOMEM); else result = AVERROR_INVALIDDATA; goto failed; } break; } #endif default: return AVERROR_INVALIDDATA; } *buf = pkt_data; *buf_size = pkt_size; return 0; failed: av_free(pkt_data); return result; } static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska, AVPacket *pkt, uint64_t display_duration) { AVBufferRef *line; char *layer, *ptr = pkt->data, *end = ptr + pkt->size; for (; *ptr != ',' && ptr < end - 1; ptr++) ; if (*ptr == ',') layer = ++ptr; for (; *ptr != ',' && ptr < end - 1; ptr++) ; if (*ptr == ',') { int64_t end_pts = pkt->pts + display_duration; int sc = matroska->time_scale * pkt->pts / 10000000; int ec = matroska->time_scale * end_pts / 10000000; int sh, sm, ss, eh, em, es, len; sh = sc / 360000; sc -= 360000 * sh; sm = sc / 6000; sc -= 6000 * sm; ss = sc / 100; sc -= 100 * ss; eh = ec / 360000; ec -= 360000 * eh; em = ec / 6000; ec -= 6000 * em; es = ec / 100; ec -= 100 * es; *ptr++ = '\0'; len = 50 + end - ptr + FF_INPUT_BUFFER_PADDING_SIZE; if (!(line = av_buffer_alloc(len))) return; snprintf(line->data, len, "Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n", layer, sh, sm, ss, sc, eh, em, es, ec, ptr); av_buffer_unref(&pkt->buf); pkt->buf = line; pkt->data = line->data; pkt->size = strlen(line->data); } } static int matroska_merge_packets(AVPacket *out, AVPacket *in) { int old_size = out->size; int ret = av_grow_packet(out, in->size); if (ret < 0) return ret; memcpy(out->data + old_size, in->data, in->size); av_free_packet(in); av_free(in); return 0; } static void matroska_convert_tag(AVFormatContext *s, EbmlList *list, AVDictionary **metadata, char *prefix) { MatroskaTag *tags = list->elem; char key[1024]; int i; for (i = 0; i < list->nb_elem; i++) { const char *lang = tags[i].lang && strcmp(tags[i].lang, "und") ? tags[i].lang : NULL; if (!tags[i].name) { av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n"); continue; } if (prefix) snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name); else av_strlcpy(key, tags[i].name, sizeof(key)); if (tags[i].def || !lang) { av_dict_set(metadata, key, tags[i].string, 0); if (tags[i].sub.nb_elem) matroska_convert_tag(s, &tags[i].sub, metadata, key); } if (lang) { av_strlcat(key, "-", sizeof(key)); av_strlcat(key, lang, sizeof(key)); av_dict_set(metadata, key, tags[i].string, 0); if (tags[i].sub.nb_elem) matroska_convert_tag(s, &tags[i].sub, metadata, key); } } ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv); } static void matroska_convert_tags(AVFormatContext *s) { MatroskaDemuxContext *matroska = s->priv_data; MatroskaTags *tags = matroska->tags.elem; int i, j; for (i = 0; i < matroska->tags.nb_elem; i++) { if (tags[i].target.attachuid) { MatroskaAttachment *attachment = matroska->attachments.elem; for (j = 0; j < matroska->attachments.nb_elem; j++) if (attachment[j].uid == tags[i].target.attachuid && attachment[j].stream) matroska_convert_tag(s, &tags[i].tag, &attachment[j].stream->metadata, NULL); } else if (tags[i].target.chapteruid) { MatroskaChapter *chapter = matroska->chapters.elem; for (j = 0; j < matroska->chapters.nb_elem; j++) if (chapter[j].uid == tags[i].target.chapteruid && chapter[j].chapter) matroska_convert_tag(s, &tags[i].tag, &chapter[j].chapter->metadata, NULL); } else if (tags[i].target.trackuid) { MatroskaTrack *track = matroska->tracks.elem; for (j = 0; j < matroska->tracks.nb_elem; j++) if (track[j].uid == tags[i].target.trackuid && track[j].stream) matroska_convert_tag(s, &tags[i].tag, &track[j].stream->metadata, NULL); } else { matroska_convert_tag(s, &tags[i].tag, &s->metadata, tags[i].target.type); } } } static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska, int idx) { EbmlList *seekhead_list = &matroska->seekhead; uint32_t level_up = matroska->level_up; uint32_t saved_id = matroska->current_id; MatroskaSeekhead *seekhead = seekhead_list->elem; int64_t before_pos = avio_tell(matroska->ctx->pb); MatroskaLevel level; int64_t offset; int ret = 0; if (idx >= seekhead_list->nb_elem || seekhead[idx].id == MATROSKA_ID_SEEKHEAD || seekhead[idx].id == MATROSKA_ID_CLUSTER) return 0; /* seek */ offset = seekhead[idx].pos + matroska->segment_start; if (avio_seek(matroska->ctx->pb, offset, SEEK_SET) == offset) { /* We don't want to lose our seekhead level, so we add * a dummy. This is a crude hack. */ if (matroska->num_levels == EBML_MAX_DEPTH) { av_log(matroska->ctx, AV_LOG_INFO, "Max EBML element depth (%d) reached, " "cannot parse further.\n", EBML_MAX_DEPTH); ret = AVERROR_INVALIDDATA; } else { level.start = 0; level.length = (uint64_t) -1; matroska->levels[matroska->num_levels] = level; matroska->num_levels++; matroska->current_id = 0; ret = ebml_parse(matroska, matroska_segment, matroska); /* remove dummy level */ while (matroska->num_levels) { uint64_t length = matroska->levels[--matroska->num_levels].length; if (length == (uint64_t) -1) break; } } } /* seek back */ avio_seek(matroska->ctx->pb, before_pos, SEEK_SET); matroska->level_up = level_up; matroska->current_id = saved_id; return ret; } static void matroska_execute_seekhead(MatroskaDemuxContext *matroska) { EbmlList *seekhead_list = &matroska->seekhead; int64_t before_pos = avio_tell(matroska->ctx->pb); int i; // we should not do any seeking in the streaming case if (!matroska->ctx->pb->seekable || (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)) return; for (i = 0; i < seekhead_list->nb_elem; i++) { MatroskaSeekhead *seekhead = seekhead_list->elem; if (seekhead[i].pos <= before_pos) continue; // defer cues parsing until we actually need cue data. if (seekhead[i].id == MATROSKA_ID_CUES) { matroska->cues_parsing_deferred = 1; continue; } if (matroska_parse_seekhead_entry(matroska, i) < 0) break; } } static void matroska_parse_cues(MatroskaDemuxContext *matroska) { EbmlList *seekhead_list = &matroska->seekhead; MatroskaSeekhead *seekhead = seekhead_list->elem; EbmlList *index_list; MatroskaIndex *index; int index_scale = 1; int i, j; for (i = 0; i < seekhead_list->nb_elem; i++) if (seekhead[i].id == MATROSKA_ID_CUES) break; assert(i <= seekhead_list->nb_elem); matroska_parse_seekhead_entry(matroska, i); index_list = &matroska->index; index = index_list->elem; if (index_list->nb_elem && index[0].time > 1E14 / matroska->time_scale) { av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n"); index_scale = matroska->time_scale; } for (i = 0; i < index_list->nb_elem; i++) { EbmlList *pos_list = &index[i].pos; MatroskaIndexPos *pos = pos_list->elem; for (j = 0; j < pos_list->nb_elem; j++) { MatroskaTrack *track = matroska_find_track_by_num(matroska, pos[j].track); if (track && track->stream) av_add_index_entry(track->stream, pos[j].pos + matroska->segment_start, index[i].time / index_scale, 0, 0, AVINDEX_KEYFRAME); } } } static int matroska_aac_profile(char *codec_id) { static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" }; int profile; for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++) if (strstr(codec_id, aac_profiles[profile])) break; return profile + 1; } static int matroska_aac_sri(int samplerate) { int sri; for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++) if (avpriv_mpeg4audio_sample_rates[sri] == samplerate) break; return sri; } static int matroska_read_header(AVFormatContext *s) { MatroskaDemuxContext *matroska = s->priv_data; EbmlList *attachments_list = &matroska->attachments; EbmlList *chapters_list = &matroska->chapters; MatroskaAttachment *attachments; MatroskaChapter *chapters; MatroskaTrack *tracks; uint64_t max_start = 0; int64_t pos; Ebml ebml = { 0 }; AVStream *st; int i, j, res; matroska->ctx = s; /* First read the EBML header. */ if (ebml_parse(matroska, ebml_syntax, &ebml) || ebml.version > EBML_VERSION || ebml.max_size > sizeof(uint64_t) || ebml.id_length > sizeof(uint32_t) || ebml.doctype_version > 2) { av_log(matroska->ctx, AV_LOG_ERROR, "EBML header using unsupported features\n" "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n", ebml.version, ebml.doctype, ebml.doctype_version); ebml_free(ebml_syntax, &ebml); return AVERROR_PATCHWELCOME; } for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) if (!strcmp(ebml.doctype, matroska_doctypes[i])) break; if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) { av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype); if (matroska->ctx->error_recognition & AV_EF_EXPLODE) { ebml_free(ebml_syntax, &ebml); return AVERROR_INVALIDDATA; } } ebml_free(ebml_syntax, &ebml); /* The next thing is a segment. */ pos = avio_tell(matroska->ctx->pb); res = ebml_parse(matroska, matroska_segments, matroska); // try resyncing until we find a EBML_STOP type element. while (res != 1) { res = matroska_resync(matroska, pos); if (res < 0) return res; pos = avio_tell(matroska->ctx->pb); res = ebml_parse(matroska, matroska_segment, matroska); } matroska_execute_seekhead(matroska); if (!matroska->time_scale) matroska->time_scale = 1000000; if (matroska->duration) matroska->ctx->duration = matroska->duration * matroska->time_scale * 1000 / AV_TIME_BASE; av_dict_set(&s->metadata, "title", matroska->title, 0); tracks = matroska->tracks.elem; for (i = 0; i < matroska->tracks.nb_elem; i++) { MatroskaTrack *track = &tracks[i]; enum AVCodecID codec_id = AV_CODEC_ID_NONE; EbmlList *encodings_list = &track->encodings; MatroskaTrackEncoding *encodings = encodings_list->elem; uint8_t *extradata = NULL; int extradata_size = 0; int extradata_offset = 0; AVIOContext b; /* Apply some sanity checks. */ if (track->type != MATROSKA_TRACK_TYPE_VIDEO && track->type != MATROSKA_TRACK_TYPE_AUDIO && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) { av_log(matroska->ctx, AV_LOG_INFO, "Unknown or unsupported track type %"PRIu64"\n", track->type); continue; } if (track->codec_id == NULL) continue; if (track->type == MATROSKA_TRACK_TYPE_VIDEO) { if (!track->default_duration && track->video.frame_rate > 0) track->default_duration = 1000000000 / track->video.frame_rate; if (!track->video.display_width) track->video.display_width = track->video.pixel_width; if (!track->video.display_height) track->video.display_height = track->video.pixel_height; } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) { if (!track->audio.out_samplerate) track->audio.out_samplerate = track->audio.samplerate; } if (encodings_list->nb_elem > 1) { av_log(matroska->ctx, AV_LOG_ERROR, "Multiple combined encodings not supported"); } else if (encodings_list->nb_elem == 1) { if (encodings[0].type || ( #if CONFIG_ZLIB encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB && #endif #if CONFIG_BZLIB encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB && #endif #if CONFIG_LZO encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO && #endif encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP)) { encodings[0].scope = 0; av_log(matroska->ctx, AV_LOG_ERROR, "Unsupported encoding type"); } else if (track->codec_priv.size && encodings[0].scope & 2) { uint8_t *codec_priv = track->codec_priv.data; int ret = matroska_decode_buffer(&track->codec_priv.data, &track->codec_priv.size, track); if (ret < 0) { track->codec_priv.data = NULL; track->codec_priv.size = 0; av_log(matroska->ctx, AV_LOG_ERROR, "Failed to decode codec private data\n"); } if (codec_priv != track->codec_priv.data) av_free(codec_priv); } } for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) { if (!strncmp(ff_mkv_codec_tags[j].str, track->codec_id, strlen(ff_mkv_codec_tags[j].str))) { codec_id = ff_mkv_codec_tags[j].id; break; } } st = track->stream = avformat_new_stream(s, NULL); if (st == NULL) return AVERROR(ENOMEM); if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") && track->codec_priv.size >= 40 && track->codec_priv.data != NULL) { track->ms_compat = 1; track->video.fourcc = AV_RL32(track->codec_priv.data + 16); codec_id = ff_codec_get_id(ff_codec_bmp_tags, track->video.fourcc); extradata_offset = 40; } else if (!strcmp(track->codec_id, "A_MS/ACM") && track->codec_priv.size >= 14 && track->codec_priv.data != NULL) { int ret; ffio_init_context(&b, track->codec_priv.data, track->codec_priv.size, 0, NULL, NULL, NULL, NULL); ret = ff_get_wav_header(&b, st->codec, track->codec_priv.size); if (ret < 0) return ret; codec_id = st->codec->codec_id; extradata_offset = FFMIN(track->codec_priv.size, 18); } else if (!strcmp(track->codec_id, "V_QUICKTIME") && (track->codec_priv.size >= 86) && (track->codec_priv.data != NULL)) { track->video.fourcc = AV_RL32(track->codec_priv.data); codec_id = ff_codec_get_id(ff_codec_movvideo_tags, track->video.fourcc); } else if (codec_id == AV_CODEC_ID_PCM_S16BE) { switch (track->audio.bitdepth) { case 8: codec_id = AV_CODEC_ID_PCM_U8; break; case 24: codec_id = AV_CODEC_ID_PCM_S24BE; break; case 32: codec_id = AV_CODEC_ID_PCM_S32BE; break; } } else if (codec_id == AV_CODEC_ID_PCM_S16LE) { switch (track->audio.bitdepth) { case 8: codec_id = AV_CODEC_ID_PCM_U8; break; case 24: codec_id = AV_CODEC_ID_PCM_S24LE; break; case 32: codec_id = AV_CODEC_ID_PCM_S32LE; break; } } else if (codec_id == AV_CODEC_ID_PCM_F32LE && track->audio.bitdepth == 64) { codec_id = AV_CODEC_ID_PCM_F64LE; } else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) { int profile = matroska_aac_profile(track->codec_id); int sri = matroska_aac_sri(track->audio.samplerate); extradata = av_mallocz(5 + FF_INPUT_BUFFER_PADDING_SIZE); if (extradata == NULL) return AVERROR(ENOMEM); extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1); extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3); if (strstr(track->codec_id, "SBR")) { sri = matroska_aac_sri(track->audio.out_samplerate); extradata[2] = 0x56; extradata[3] = 0xE5; extradata[4] = 0x80 | (sri << 3); extradata_size = 5; } else extradata_size = 2; } else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size) { /* Only ALAC's magic cookie is stored in Matroska's track headers. * Create the "atom size", "tag", and "tag version" fields the * decoder expects manually. */ extradata_size = 12 + track->codec_priv.size; extradata = av_mallocz(extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); if (extradata == NULL) return AVERROR(ENOMEM); AV_WB32(extradata, extradata_size); memcpy(&extradata[4], "alac", 4); AV_WB32(&extradata[8], 0); memcpy(&extradata[12], track->codec_priv.data, track->codec_priv.size); } else if (codec_id == AV_CODEC_ID_TTA) { extradata_size = 30; extradata = av_mallocz(extradata_size); if (extradata == NULL) return AVERROR(ENOMEM); ffio_init_context(&b, extradata, extradata_size, 1, NULL, NULL, NULL, NULL); avio_write(&b, "TTA1", 4); avio_wl16(&b, 1); avio_wl16(&b, track->audio.channels); avio_wl16(&b, track->audio.bitdepth); avio_wl32(&b, track->audio.out_samplerate); avio_wl32(&b, matroska->ctx->duration * track->audio.out_samplerate); } else if (codec_id == AV_CODEC_ID_RV10 || codec_id == AV_CODEC_ID_RV20 || codec_id == AV_CODEC_ID_RV30 || codec_id == AV_CODEC_ID_RV40) { extradata_offset = 26; } else if (codec_id == AV_CODEC_ID_RA_144) { track->audio.out_samplerate = 8000; track->audio.channels = 1; } else if (codec_id == AV_CODEC_ID_RA_288 || codec_id == AV_CODEC_ID_COOK || codec_id == AV_CODEC_ID_ATRAC3 || codec_id == AV_CODEC_ID_SIPR) { int flavor; ffio_init_context(&b, track->codec_priv.data, track->codec_priv.size, 0, NULL, NULL, NULL, NULL); avio_skip(&b, 22); flavor = avio_rb16(&b); track->audio.coded_framesize = avio_rb32(&b); avio_skip(&b, 12); track->audio.sub_packet_h = avio_rb16(&b); track->audio.frame_size = avio_rb16(&b); track->audio.sub_packet_size = avio_rb16(&b); if (flavor <= 0 || track->audio.coded_framesize <= 0 || track->audio.sub_packet_h <= 0 || track->audio.frame_size <= 0 || track->audio.sub_packet_size <= 0) return AVERROR_INVALIDDATA; track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h); if (codec_id == AV_CODEC_ID_RA_288) { st->codec->block_align = track->audio.coded_framesize; track->codec_priv.size = 0; } else { if (codec_id == AV_CODEC_ID_SIPR && flavor < 4) { const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 }; track->audio.sub_packet_size = ff_sipr_subpk_size[flavor]; st->codec->bit_rate = sipr_bit_rate[flavor]; } st->codec->block_align = track->audio.sub_packet_size; extradata_offset = 78; } } track->codec_priv.size -= extradata_offset; if (codec_id == AV_CODEC_ID_NONE) av_log(matroska->ctx, AV_LOG_INFO, "Unknown/unsupported AVCodecID %s.\n", track->codec_id); if (track->time_scale < 0.01) track->time_scale = 1.0; avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale, 1000 * 1000 * 1000); /* 64 bit pts in ns */ st->codec->codec_id = codec_id; st->start_time = 0; if (strcmp(track->language, "und")) av_dict_set(&st->metadata, "language", track->language, 0); av_dict_set(&st->metadata, "title", track->name, 0); if (track->flag_default) st->disposition |= AV_DISPOSITION_DEFAULT; if (track->flag_forced) st->disposition |= AV_DISPOSITION_FORCED; if (!st->codec->extradata) { if (extradata) { st->codec->extradata = extradata; st->codec->extradata_size = extradata_size; } else if (track->codec_priv.data && track->codec_priv.size > 0) { st->codec->extradata = av_mallocz(track->codec_priv.size + FF_INPUT_BUFFER_PADDING_SIZE); if (st->codec->extradata == NULL) return AVERROR(ENOMEM); st->codec->extradata_size = track->codec_priv.size; memcpy(st->codec->extradata, track->codec_priv.data + extradata_offset, track->codec_priv.size); } } if (track->type == MATROSKA_TRACK_TYPE_VIDEO) { st->codec->codec_type = AVMEDIA_TYPE_VIDEO; st->codec->codec_tag = track->video.fourcc; st->codec->width = track->video.pixel_width; st->codec->height = track->video.pixel_height; av_reduce(&st->sample_aspect_ratio.num, &st->sample_aspect_ratio.den, st->codec->height * track->video.display_width, st->codec->width * track->video.display_height, 255); if (st->codec->codec_id != AV_CODEC_ID_H264 && st->codec->codec_id != AV_CODEC_ID_HEVC) st->need_parsing = AVSTREAM_PARSE_HEADERS; if (track->default_duration) { av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den, 1000000000, track->default_duration, 30000); } } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) { st->codec->codec_type = AVMEDIA_TYPE_AUDIO; st->codec->sample_rate = track->audio.out_samplerate; st->codec->channels = track->audio.channels; if (st->codec->codec_id != AV_CODEC_ID_AAC) st->need_parsing = AVSTREAM_PARSE_HEADERS; } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) { st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; if (st->codec->codec_id == AV_CODEC_ID_SSA) matroska->contains_ssa = 1; } } attachments = attachments_list->elem; for (j = 0; j < attachments_list->nb_elem; j++) { if (!(attachments[j].filename && attachments[j].mime && attachments[j].bin.data && attachments[j].bin.size > 0)) { av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n"); } else { AVStream *st = avformat_new_stream(s, NULL); if (st == NULL) break; av_dict_set(&st->metadata, "filename", attachments[j].filename, 0); av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0); st->codec->codec_id = AV_CODEC_ID_NONE; st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT; st->codec->extradata = av_malloc(attachments[j].bin.size); if (st->codec->extradata == NULL) break; st->codec->extradata_size = attachments[j].bin.size; memcpy(st->codec->extradata, attachments[j].bin.data, attachments[j].bin.size); for (i = 0; ff_mkv_mime_tags[i].id != AV_CODEC_ID_NONE; i++) { if (!strncmp(ff_mkv_mime_tags[i].str, attachments[j].mime, strlen(ff_mkv_mime_tags[i].str))) { st->codec->codec_id = ff_mkv_mime_tags[i].id; break; } } attachments[j].stream = st; } } chapters = chapters_list->elem; for (i = 0; i < chapters_list->nb_elem; i++) if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid && (max_start == 0 || chapters[i].start > max_start)) { chapters[i].chapter = avpriv_new_chapter(s, chapters[i].uid, (AVRational) { 1, 1000000000 }, chapters[i].start, chapters[i].end, chapters[i].title); av_dict_set(&chapters[i].chapter->metadata, "title", chapters[i].title, 0); max_start = chapters[i].start; } matroska_convert_tags(s); return 0; } /* * Put one packet in an application-supplied AVPacket struct. * Returns 0 on success or -1 on failure. */ static int matroska_deliver_packet(MatroskaDemuxContext *matroska, AVPacket *pkt) { if (matroska->num_packets > 0) { memcpy(pkt, matroska->packets[0], sizeof(AVPacket)); av_free(matroska->packets[0]); if (matroska->num_packets > 1) { void *newpackets; memmove(&matroska->packets[0], &matroska->packets[1], (matroska->num_packets - 1) * sizeof(AVPacket *)); newpackets = av_realloc(matroska->packets, (matroska->num_packets - 1) * sizeof(AVPacket *)); if (newpackets) matroska->packets = newpackets; } else { av_freep(&matroska->packets); matroska->prev_pkt = NULL; } matroska->num_packets--; return 0; } return -1; } /* * Free all packets in our internal queue. */ static void matroska_clear_queue(MatroskaDemuxContext *matroska) { matroska->prev_pkt = NULL; if (matroska->packets) { int n; for (n = 0; n < matroska->num_packets; n++) { av_free_packet(matroska->packets[n]); av_free(matroska->packets[n]); } av_freep(&matroska->packets); matroska->num_packets = 0; } } static int matroska_parse_laces(MatroskaDemuxContext *matroska, uint8_t **buf, int *buf_size, int type, uint32_t **lace_buf, int *laces) { int res = 0, n, size = *buf_size; uint8_t *data = *buf; uint32_t *lace_size; if (!type) { *laces = 1; *lace_buf = av_mallocz(sizeof(int)); if (!*lace_buf) return AVERROR(ENOMEM); *lace_buf[0] = size; return 0; } assert(size > 0); *laces = *data + 1; data += 1; size -= 1; lace_size = av_mallocz(*laces * sizeof(int)); if (!lace_size) return AVERROR(ENOMEM); switch (type) { case 0x1: /* Xiph lacing */ { uint8_t temp; uint32_t total = 0; for (n = 0; res == 0 && n < *laces - 1; n++) { while (1) { if (size == 0) { res = AVERROR_EOF; break; } temp = *data; lace_size[n] += temp; data += 1; size -= 1; if (temp != 0xff) break; } total += lace_size[n]; } if (size <= total) { res = AVERROR_INVALIDDATA; break; } lace_size[n] = size - total; break; } case 0x2: /* fixed-size lacing */ if (size % (*laces)) { res = AVERROR_INVALIDDATA; break; } for (n = 0; n < *laces; n++) lace_size[n] = size / *laces; break; case 0x3: /* EBML lacing */ { uint64_t num; uint64_t total; n = matroska_ebmlnum_uint(matroska, data, size, &num); if (n < 0) { av_log(matroska->ctx, AV_LOG_INFO, "EBML block data error\n"); res = n; break; } data += n; size -= n; total = lace_size[0] = num; for (n = 1; res == 0 && n < *laces - 1; n++) { int64_t snum; int r; r = matroska_ebmlnum_sint(matroska, data, size, &snum); if (r < 0) { av_log(matroska->ctx, AV_LOG_INFO, "EBML block data error\n"); res = r; break; } data += r; size -= r; lace_size[n] = lace_size[n - 1] + snum; total += lace_size[n]; } if (size <= total) { res = AVERROR_INVALIDDATA; break; } lace_size[*laces - 1] = size - total; break; } } *buf = data; *lace_buf = lace_size; *buf_size = size; return res; } static int matroska_parse_rm_audio(MatroskaDemuxContext *matroska, MatroskaTrack *track, AVStream *st, uint8_t *data, int size, uint64_t timecode, uint64_t duration, int64_t pos) { int a = st->codec->block_align; int sps = track->audio.sub_packet_size; int cfs = track->audio.coded_framesize; int h = track->audio.sub_packet_h; int y = track->audio.sub_packet_cnt; int w = track->audio.frame_size; int x; if (!track->audio.pkt_cnt) { if (track->audio.sub_packet_cnt == 0) track->audio.buf_timecode = timecode; if (st->codec->codec_id == AV_CODEC_ID_RA_288) { if (size < cfs * h / 2) { av_log(matroska->ctx, AV_LOG_ERROR, "Corrupt int4 RM-style audio packet size\n"); return AVERROR_INVALIDDATA; } for (x = 0; x < h / 2; x++) memcpy(track->audio.buf + x * 2 * w + y * cfs, data + x * cfs, cfs); } else if (st->codec->codec_id == AV_CODEC_ID_SIPR) { if (size < w) { av_log(matroska->ctx, AV_LOG_ERROR, "Corrupt sipr RM-style audio packet size\n"); return AVERROR_INVALIDDATA; } memcpy(track->audio.buf + y * w, data, w); } else { if (size < sps * w / sps) { av_log(matroska->ctx, AV_LOG_ERROR, "Corrupt generic RM-style audio packet size\n"); return AVERROR_INVALIDDATA; } for (x = 0; x < w / sps; x++) memcpy(track->audio.buf + sps * (h * x + ((h + 1) / 2) * (y & 1) + (y >> 1)), data + x * sps, sps); } if (++track->audio.sub_packet_cnt >= h) { if (st->codec->codec_id == AV_CODEC_ID_SIPR) ff_rm_reorder_sipr_data(track->audio.buf, h, w); track->audio.sub_packet_cnt = 0; track->audio.pkt_cnt = h * w / a; } } while (track->audio.pkt_cnt) { AVPacket *pkt = av_mallocz(sizeof(AVPacket)); av_new_packet(pkt, a); memcpy(pkt->data, track->audio.buf + a * (h * w / a - track->audio.pkt_cnt--), a); pkt->pts = track->audio.buf_timecode; track->audio.buf_timecode = AV_NOPTS_VALUE; pkt->pos = pos; pkt->stream_index = st->index; dynarray_add(&matroska->packets, &matroska->num_packets, pkt); } return 0; } /* reconstruct full wavpack blocks from mangled matroska ones */ static int matroska_parse_wavpack(MatroskaTrack *track, uint8_t *src, uint8_t **pdst, int *size) { uint8_t *dst = NULL; int dstlen = 0; int srclen = *size; uint32_t samples; uint16_t ver; int ret, offset = 0; if (srclen < 12 || track->stream->codec->extradata_size < 2) return AVERROR_INVALIDDATA; ver = AV_RL16(track->stream->codec->extradata); samples = AV_RL32(src); src += 4; srclen -= 4; while (srclen >= 8) { int multiblock; uint32_t blocksize; uint8_t *tmp; uint32_t flags = AV_RL32(src); uint32_t crc = AV_RL32(src + 4); src += 8; srclen -= 8; multiblock = (flags & 0x1800) != 0x1800; if (multiblock) { if (srclen < 4) { ret = AVERROR_INVALIDDATA; goto fail; } blocksize = AV_RL32(src); src += 4; srclen -= 4; } else blocksize = srclen; if (blocksize > srclen) { ret = AVERROR_INVALIDDATA; goto fail; } tmp = av_realloc(dst, dstlen + blocksize + 32); if (!tmp) { ret = AVERROR(ENOMEM); goto fail; } dst = tmp; dstlen += blocksize + 32; AV_WL32(dst + offset, MKTAG('w', 'v', 'p', 'k')); // tag AV_WL32(dst + offset + 4, blocksize + 24); // blocksize - 8 AV_WL16(dst + offset + 8, ver); // version AV_WL16(dst + offset + 10, 0); // track/index_no AV_WL32(dst + offset + 12, 0); // total samples AV_WL32(dst + offset + 16, 0); // block index AV_WL32(dst + offset + 20, samples); // number of samples AV_WL32(dst + offset + 24, flags); // flags AV_WL32(dst + offset + 28, crc); // crc memcpy(dst + offset + 32, src, blocksize); // block data src += blocksize; srclen -= blocksize; offset += blocksize + 32; } *pdst = dst; *size = dstlen; return 0; fail: av_freep(&dst); return ret; } static int matroska_parse_frame(MatroskaDemuxContext *matroska, MatroskaTrack *track, AVStream *st, uint8_t *data, int pkt_size, uint64_t timecode, uint64_t duration, int64_t pos, int is_keyframe) { MatroskaTrackEncoding *encodings = track->encodings.elem; uint8_t *pkt_data = data; int offset = 0, res; AVPacket *pkt; if (encodings && encodings->scope & 1) { res = matroska_decode_buffer(&pkt_data, &pkt_size, track); if (res < 0) return res; } if (st->codec->codec_id == AV_CODEC_ID_WAVPACK) { uint8_t *wv_data; res = matroska_parse_wavpack(track, pkt_data, &wv_data, &pkt_size); if (res < 0) { av_log(matroska->ctx, AV_LOG_ERROR, "Error parsing a wavpack block.\n"); goto fail; } if (pkt_data != data) av_freep(&pkt_data); pkt_data = wv_data; } if (st->codec->codec_id == AV_CODEC_ID_PRORES) offset = 8; pkt = av_mallocz(sizeof(AVPacket)); /* XXX: prevent data copy... */ if (av_new_packet(pkt, pkt_size + offset) < 0) { av_free(pkt); return AVERROR(ENOMEM); } if (st->codec->codec_id == AV_CODEC_ID_PRORES) { uint8_t *buf = pkt->data; bytestream_put_be32(&buf, pkt_size); bytestream_put_be32(&buf, MKBETAG('i', 'c', 'p', 'f')); } memcpy(pkt->data + offset, pkt_data, pkt_size); if (pkt_data != data) av_free(pkt_data); pkt->flags = is_keyframe; pkt->stream_index = st->index; if (track->ms_compat) pkt->dts = timecode; else pkt->pts = timecode; pkt->pos = pos; if (st->codec->codec_id == AV_CODEC_ID_TEXT) pkt->convergence_duration = duration; else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE) pkt->duration = duration; if (st->codec->codec_id == AV_CODEC_ID_SSA) matroska_fix_ass_packet(matroska, pkt, duration); if (matroska->prev_pkt && timecode != AV_NOPTS_VALUE && matroska->prev_pkt->pts == timecode && matroska->prev_pkt->stream_index == st->index && st->codec->codec_id == AV_CODEC_ID_SSA) matroska_merge_packets(matroska->prev_pkt, pkt); else { dynarray_add(&matroska->packets, &matroska->num_packets, pkt); matroska->prev_pkt = pkt; } return 0; fail: if (pkt_data != data) av_freep(&pkt_data); return res; } static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data, int size, int64_t pos, uint64_t cluster_time, uint64_t block_duration, int is_keyframe, int64_t cluster_pos) { uint64_t timecode = AV_NOPTS_VALUE; MatroskaTrack *track; int res = 0; AVStream *st; int16_t block_time; uint32_t *lace_size = NULL; int n, flags, laces = 0; uint64_t num, duration; if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) { av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n"); return n; } data += n; size -= n; track = matroska_find_track_by_num(matroska, num); if (!track || !track->stream) { av_log(matroska->ctx, AV_LOG_INFO, "Invalid stream %"PRIu64" or size %u\n", num, size); return AVERROR_INVALIDDATA; } else if (size <= 3) return 0; st = track->stream; if (st->discard >= AVDISCARD_ALL) return res; block_time = AV_RB16(data); data += 2; flags = *data++; size -= 3; if (is_keyframe == -1) is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0; if (cluster_time != (uint64_t) -1 && (block_time >= 0 || cluster_time >= -block_time)) { timecode = cluster_time + block_time; if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE && timecode < track->end_timecode) is_keyframe = 0; /* overlapping subtitles are not key frame */ if (is_keyframe) av_add_index_entry(st, cluster_pos, timecode, 0, 0, AVINDEX_KEYFRAME); } if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) { if (!is_keyframe || timecode < matroska->skip_to_timecode) return res; matroska->skip_to_keyframe = 0; } res = matroska_parse_laces(matroska, &data, &size, (flags & 0x06) >> 1, &lace_size, &laces); if (res) goto end; if (block_duration != AV_NOPTS_VALUE) { duration = block_duration / laces; if (block_duration != duration * laces) { av_log(matroska->ctx, AV_LOG_WARNING, "Incorrect block_duration, possibly corrupted container"); } } else { duration = track->default_duration / matroska->time_scale; block_duration = duration * laces; } if (timecode != AV_NOPTS_VALUE) track->end_timecode = FFMAX(track->end_timecode, timecode + block_duration); for (n = 0; n < laces; n++) { if ((st->codec->codec_id == AV_CODEC_ID_RA_288 || st->codec->codec_id == AV_CODEC_ID_COOK || st->codec->codec_id == AV_CODEC_ID_SIPR || st->codec->codec_id == AV_CODEC_ID_ATRAC3) && st->codec->block_align && track->audio.sub_packet_size) { res = matroska_parse_rm_audio(matroska, track, st, data, lace_size[n], timecode, duration, pos); if (res) goto end; } else { res = matroska_parse_frame(matroska, track, st, data, lace_size[n], timecode, duration, pos, !n ? is_keyframe : 0); if (res) goto end; } if (timecode != AV_NOPTS_VALUE) timecode = duration ? timecode + duration : AV_NOPTS_VALUE; data += lace_size[n]; } end: av_free(lace_size); return res; } static int matroska_parse_cluster_incremental(MatroskaDemuxContext *matroska) { EbmlList *blocks_list; MatroskaBlock *blocks; int i, res; res = ebml_parse(matroska, matroska_cluster_incremental_parsing, &matroska->current_cluster); if (res == 1) { /* New Cluster */ if (matroska->current_cluster_pos) ebml_level_end(matroska); ebml_free(matroska_cluster, &matroska->current_cluster); memset(&matroska->current_cluster, 0, sizeof(MatroskaCluster)); matroska->current_cluster_num_blocks = 0; matroska->current_cluster_pos = avio_tell(matroska->ctx->pb); matroska->prev_pkt = NULL; /* sizeof the ID which was already read */ if (matroska->current_id) matroska->current_cluster_pos -= 4; res = ebml_parse(matroska, matroska_clusters_incremental, &matroska->current_cluster); /* Try parsing the block again. */ if (res == 1) res = ebml_parse(matroska, matroska_cluster_incremental_parsing, &matroska->current_cluster); } if (!res && matroska->current_cluster_num_blocks < matroska->current_cluster.blocks.nb_elem) { blocks_list = &matroska->current_cluster.blocks; blocks = blocks_list->elem; matroska->current_cluster_num_blocks = blocks_list->nb_elem; i = blocks_list->nb_elem - 1; if (blocks[i].bin.size > 0 && blocks[i].bin.data) { int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1; if (!blocks[i].non_simple) blocks[i].duration = AV_NOPTS_VALUE; res = matroska_parse_block(matroska, blocks[i].bin.data, blocks[i].bin.size, blocks[i].bin.pos, matroska->current_cluster.timecode, blocks[i].duration, is_keyframe, matroska->current_cluster_pos); } } if (res < 0) matroska->done = 1; return res; } static int matroska_parse_cluster(MatroskaDemuxContext *matroska) { MatroskaCluster cluster = { 0 }; EbmlList *blocks_list; MatroskaBlock *blocks; int i, res; int64_t pos; if (!matroska->contains_ssa) return matroska_parse_cluster_incremental(matroska); pos = avio_tell(matroska->ctx->pb); matroska->prev_pkt = NULL; if (matroska->current_id) pos -= 4; /* sizeof the ID which was already read */ res = ebml_parse(matroska, matroska_clusters, &cluster); blocks_list = &cluster.blocks; blocks = blocks_list->elem; for (i = 0; i < blocks_list->nb_elem && !res; i++) if (blocks[i].bin.size > 0 && blocks[i].bin.data) { int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1; if (!blocks[i].non_simple) blocks[i].duration = AV_NOPTS_VALUE; res = matroska_parse_block(matroska, blocks[i].bin.data, blocks[i].bin.size, blocks[i].bin.pos, cluster.timecode, blocks[i].duration, is_keyframe, pos); } ebml_free(matroska_cluster, &cluster); return res; } static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt) { MatroskaDemuxContext *matroska = s->priv_data; int ret = 0; while (!ret && matroska_deliver_packet(matroska, pkt)) { int64_t pos = avio_tell(matroska->ctx->pb); if (matroska->done) return AVERROR_EOF; if (matroska_parse_cluster(matroska) < 0) ret = matroska_resync(matroska, pos); } if (ret == AVERROR_INVALIDDATA && pkt->data) { pkt->flags |= AV_PKT_FLAG_CORRUPT; return 0; } return ret; } static int matroska_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) { MatroskaDemuxContext *matroska = s->priv_data; MatroskaTrack *tracks = matroska->tracks.elem; AVStream *st = s->streams[stream_index]; int i, index, index_sub, index_min; /* Parse the CUES now since we need the index data to seek. */ if (matroska->cues_parsing_deferred) { matroska_parse_cues(matroska); matroska->cues_parsing_deferred = 0; } if (!st->nb_index_entries) return 0; timestamp = FFMAX(timestamp, st->index_entries[0].timestamp); if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) { avio_seek(s->pb, st->index_entries[st->nb_index_entries - 1].pos, SEEK_SET); matroska->current_id = 0; while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) { matroska_clear_queue(matroska); if (matroska_parse_cluster(matroska) < 0) break; } } matroska_clear_queue(matroska); if (index < 0) return 0; index_min = index; for (i = 0; i < matroska->tracks.nb_elem; i++) { tracks[i].audio.pkt_cnt = 0; tracks[i].audio.sub_packet_cnt = 0; tracks[i].audio.buf_timecode = AV_NOPTS_VALUE; tracks[i].end_timecode = 0; if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE && !tracks[i].stream->discard != AVDISCARD_ALL) { index_sub = av_index_search_timestamp( tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD); if (index_sub >= 0 && st->index_entries[index_sub].pos < st->index_entries[index_min].pos && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000 / matroska->time_scale) index_min = index_sub; } } avio_seek(s->pb, st->index_entries[index_min].pos, SEEK_SET); matroska->current_id = 0; matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY); matroska->skip_to_timecode = st->index_entries[index].timestamp; matroska->done = 0; ff_update_cur_dts(s, st, st->index_entries[index].timestamp); return 0; } static int matroska_read_close(AVFormatContext *s) { MatroskaDemuxContext *matroska = s->priv_data; MatroskaTrack *tracks = matroska->tracks.elem; int n; matroska_clear_queue(matroska); for (n = 0; n < matroska->tracks.nb_elem; n++) if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO) av_free(tracks[n].audio.buf); ebml_free(matroska_cluster, &matroska->current_cluster); ebml_free(matroska_segment, matroska); return 0; } AVInputFormat ff_matroska_demuxer = { .name = "matroska,webm", .long_name = NULL_IF_CONFIG_SMALL("Matroska / WebM"), .priv_data_size = sizeof(MatroskaDemuxContext), .read_probe = matroska_probe, .read_header = matroska_read_header, .read_packet = matroska_read_packet, .read_close = matroska_read_close, .read_seek = matroska_read_seek, };