/* * Matroska file demuxer (no muxer yet) * Copyright (c) 2003-2004 The ffmpeg Project * * This file is part of FFmpeg. * * FFmpeg 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. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file matroska.c * Matroska file demuxer * by Ronald Bultje * with a little help from Moritz Bunkus * Specs available on the matroska project page: * http://www.matroska.org/. */ #include "avformat.h" /* For codec_get_bmp_id and codec_get_wav_id. */ #include "riff.h" #include "intfloat_readwrite.h" /* EBML version supported */ #define EBML_VERSION 1 /* top-level master-IDs */ #define EBML_ID_HEADER 0x1A45DFA3 /* IDs in the HEADER master */ #define EBML_ID_EBMLVERSION 0x4286 #define EBML_ID_EBMLREADVERSION 0x42F7 #define EBML_ID_EBMLMAXIDLENGTH 0x42F2 #define EBML_ID_EBMLMAXSIZELENGTH 0x42F3 #define EBML_ID_DOCTYPE 0x4282 #define EBML_ID_DOCTYPEVERSION 0x4287 #define EBML_ID_DOCTYPEREADVERSION 0x4285 /* general EBML types */ #define EBML_ID_VOID 0xEC /* * Matroska element IDs. max. 32-bit. */ /* toplevel segment */ #define MATROSKA_ID_SEGMENT 0x18538067 /* matroska top-level master IDs */ #define MATROSKA_ID_INFO 0x1549A966 #define MATROSKA_ID_TRACKS 0x1654AE6B #define MATROSKA_ID_CUES 0x1C53BB6B #define MATROSKA_ID_TAGS 0x1254C367 #define MATROSKA_ID_SEEKHEAD 0x114D9B74 #define MATROSKA_ID_CLUSTER 0x1F43B675 /* IDs in the info master */ #define MATROSKA_ID_TIMECODESCALE 0x2AD7B1 #define MATROSKA_ID_DURATION 0x4489 #define MATROSKA_ID_TITLE 0x7BA9 #define MATROSKA_ID_WRITINGAPP 0x5741 #define MATROSKA_ID_MUXINGAPP 0x4D80 #define MATROSKA_ID_DATEUTC 0x4461 /* ID in the tracks master */ #define MATROSKA_ID_TRACKENTRY 0xAE /* IDs in the trackentry master */ #define MATROSKA_ID_TRACKNUMBER 0xD7 #define MATROSKA_ID_TRACKUID 0x73C5 #define MATROSKA_ID_TRACKTYPE 0x83 #define MATROSKA_ID_TRACKAUDIO 0xE1 #define MATROSKA_ID_TRACKVIDEO 0xE0 #define MATROSKA_ID_CODECID 0x86 #define MATROSKA_ID_CODECPRIVATE 0x63A2 #define MATROSKA_ID_CODECNAME 0x258688 #define MATROSKA_ID_CODECINFOURL 0x3B4040 #define MATROSKA_ID_CODECDOWNLOADURL 0x26B240 #define MATROSKA_ID_TRACKNAME 0x536E #define MATROSKA_ID_TRACKLANGUAGE 0x22B59C #define MATROSKA_ID_TRACKFLAGENABLED 0xB9 #define MATROSKA_ID_TRACKFLAGDEFAULT 0x88 #define MATROSKA_ID_TRACKFLAGLACING 0x9C #define MATROSKA_ID_TRACKMINCACHE 0x6DE7 #define MATROSKA_ID_TRACKMAXCACHE 0x6DF8 #define MATROSKA_ID_TRACKDEFAULTDURATION 0x23E383 /* IDs in the trackvideo master */ #define MATROSKA_ID_VIDEOFRAMERATE 0x2383E3 #define MATROSKA_ID_VIDEODISPLAYWIDTH 0x54B0 #define MATROSKA_ID_VIDEODISPLAYHEIGHT 0x54BA #define MATROSKA_ID_VIDEOPIXELWIDTH 0xB0 #define MATROSKA_ID_VIDEOPIXELHEIGHT 0xBA #define MATROSKA_ID_VIDEOFLAGINTERLACED 0x9A #define MATROSKA_ID_VIDEOSTEREOMODE 0x53B9 #define MATROSKA_ID_VIDEOASPECTRATIO 0x54B3 #define MATROSKA_ID_VIDEOCOLOURSPACE 0x2EB524 /* IDs in the trackaudio master */ #define MATROSKA_ID_AUDIOSAMPLINGFREQ 0xB5 #define MATROSKA_ID_AUDIOOUTSAMPLINGFREQ 0x78B5 #define MATROSKA_ID_AUDIOBITDEPTH 0x6264 #define MATROSKA_ID_AUDIOCHANNELS 0x9F /* ID in the cues master */ #define MATROSKA_ID_POINTENTRY 0xBB /* IDs in the pointentry master */ #define MATROSKA_ID_CUETIME 0xB3 #define MATROSKA_ID_CUETRACKPOSITION 0xB7 /* IDs in the cuetrackposition master */ #define MATROSKA_ID_CUETRACK 0xF7 #define MATROSKA_ID_CUECLUSTERPOSITION 0xF1 /* IDs in the tags master */ /* TODO */ /* IDs in the seekhead master */ #define MATROSKA_ID_SEEKENTRY 0x4DBB /* IDs in the seekpoint master */ #define MATROSKA_ID_SEEKID 0x53AB #define MATROSKA_ID_SEEKPOSITION 0x53AC /* IDs in the cluster master */ #define MATROSKA_ID_CLUSTERTIMECODE 0xE7 #define MATROSKA_ID_BLOCKGROUP 0xA0 /* IDs in the blockgroup master */ #define MATROSKA_ID_BLOCK 0xA1 #define MATROSKA_ID_BLOCKDURATION 0x9B #define MATROSKA_ID_BLOCKREFERENCE 0xFB typedef enum { MATROSKA_TRACK_TYPE_VIDEO = 0x1, MATROSKA_TRACK_TYPE_AUDIO = 0x2, MATROSKA_TRACK_TYPE_COMPLEX = 0x3, MATROSKA_TRACK_TYPE_LOGO = 0x10, MATROSKA_TRACK_TYPE_SUBTITLE = 0x11, MATROSKA_TRACK_TYPE_CONTROL = 0x20, } MatroskaTrackType; typedef enum { MATROSKA_EYE_MODE_MONO = 0x0, MATROSKA_EYE_MODE_RIGHT = 0x1, MATROSKA_EYE_MODE_LEFT = 0x2, MATROSKA_EYE_MODE_BOTH = 0x3, } MatroskaEyeMode; typedef enum { MATROSKA_ASPECT_RATIO_MODE_FREE = 0x0, MATROSKA_ASPECT_RATIO_MODE_KEEP = 0x1, MATROSKA_ASPECT_RATIO_MODE_FIXED = 0x2, } MatroskaAspectRatioMode; /* * These aren't in any way "matroska-form" things, * it's just something I use in the muxer/demuxer. */ typedef enum { MATROSKA_TRACK_ENABLED = (1<<0), MATROSKA_TRACK_DEFAULT = (1<<1), MATROSKA_TRACK_LACING = (1<<2), MATROSKA_TRACK_SHIFT = (1<<16) } MatroskaTrackFlags; typedef enum { MATROSKA_VIDEOTRACK_INTERLACED = (MATROSKA_TRACK_SHIFT<<0) } MatroskaVideoTrackFlags; /* * Matroska Codec IDs. Strings. */ typedef struct CodecTags{ const char *str; enum CodecID id; }CodecTags; #define MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC "V_MS/VFW/FOURCC" #define MATROSKA_CODEC_ID_AUDIO_ACM "A_MS/ACM" static CodecTags codec_tags[]={ // {"V_MS/VFW/FOURCC" , CODEC_ID_NONE}, {"V_UNCOMPRESSED" , CODEC_ID_RAWVIDEO}, {"V_MPEG4/ISO/SP" , CODEC_ID_MPEG4}, {"V_MPEG4/ISO/ASP" , CODEC_ID_MPEG4}, {"V_MPEG4/ISO/AP" , CODEC_ID_MPEG4}, {"V_MPEG4/ISO/AVC" , CODEC_ID_H264}, {"V_MPEG4/MS/V3" , CODEC_ID_MSMPEG4V3}, {"V_MPEG1" , CODEC_ID_MPEG1VIDEO}, {"V_MPEG2" , CODEC_ID_MPEG2VIDEO}, {"V_MJPEG" , CODEC_ID_MJPEG}, {"V_REAL/RV10" , CODEC_ID_RV10}, {"V_REAL/RV20" , CODEC_ID_RV20}, {"V_REAL/RV30" , CODEC_ID_RV30}, {"V_REAL/RV40" , CODEC_ID_RV40}, /* TODO: Real/Quicktime */ // {"A_MS/ACM" , CODEC_ID_NONE}, {"A_MPEG/L1" , CODEC_ID_MP3}, {"A_MPEG/L2" , CODEC_ID_MP3}, {"A_MPEG/L3" , CODEC_ID_MP3}, {"A_PCM/INT/BIG" , CODEC_ID_PCM_U16BE}, {"A_PCM/INT/LIT" , CODEC_ID_PCM_U16LE}, // {"A_PCM/FLOAT/IEEE" , CODEC_ID_NONE}, {"A_AC3" , CODEC_ID_AC3}, {"A_DTS" , CODEC_ID_DTS}, {"A_VORBIS" , CODEC_ID_VORBIS}, {"A_AAC" , CODEC_ID_AAC}, {"A_WAVPACK4" , CODEC_ID_WAVPACK}, {NULL , CODEC_ID_NONE} /* TODO: AC3-9/10 (?), Real, Musepack, Quicktime */ }; /* max. depth in the EBML tree structure */ #define EBML_MAX_DEPTH 16 typedef struct Track { MatroskaTrackType type; /* Unique track number and track ID. stream_index is the index that * the calling app uses for this track. */ uint32_t num, uid, stream_index; char *name, *language; char *codec_id, *codec_name; unsigned char *codec_priv; int codec_priv_size; int64_t default_duration; MatroskaTrackFlags flags; } MatroskaTrack; typedef struct MatroskaVideoTrack { MatroskaTrack track; int pixel_width, pixel_height, display_width, display_height; uint32_t fourcc; MatroskaAspectRatioMode ar_mode; MatroskaEyeMode eye_mode; //.. } MatroskaVideoTrack; typedef struct MatroskaAudioTrack { MatroskaTrack track; int channels, bitdepth, internal_samplerate, samplerate; //.. } MatroskaAudioTrack; typedef struct MatroskaSubtitleTrack { MatroskaTrack track; //.. } MatroskaSubtitleTrack; typedef struct MatroskaLevel { uint64_t start, length; } MatroskaLevel; typedef struct MatroskaDemuxIndex { uint64_t pos; /* of the corresponding *cluster*! */ uint16_t track; /* reference to 'num' */ uint64_t time; /* in nanoseconds */ } MatroskaDemuxIndex; typedef struct MatroskaDemuxContext { AVFormatContext *ctx; /* ebml stuff */ int num_levels; MatroskaLevel levels[EBML_MAX_DEPTH]; int level_up; /* matroska stuff */ char *writing_app, *muxing_app; int64_t created; /* timescale in the file */ int64_t time_scale; /* position (time, ns) */ int64_t pos; /* num_streams is the number of streams that av_new_stream() was called * for ( = that are available to the calling program). */ int num_tracks, num_streams; MatroskaTrack *tracks[MAX_STREAMS]; /* cache for ID peeking */ uint32_t peek_id; /* byte position of the segment inside the stream */ offset_t segment_start; /* The packet queue. */ AVPacket **packets; int num_packets; /* have we already parse metadata/cues/clusters? */ int metadata_parsed, index_parsed, done; /* The index for seeking. */ int num_indexes; MatroskaDemuxIndex *index; } MatroskaDemuxContext; /* * The first few functions handle EBML file parsing. The rest * is the document interpretation. Matroska really just is a * EBML file. */ /* * Return: the amount of levels in the hierarchy that the * current element lies higher than the previous one. * The opposite isn't done - that's auto-done using master * element reading. */ static int ebml_read_element_level_up (MatroskaDemuxContext *matroska) { ByteIOContext *pb = &matroska->ctx->pb; offset_t pos = url_ftell(pb); int num = 0; while (matroska->num_levels > 0) { MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1]; if (pos >= level->start + level->length) { matroska->num_levels--; num++; } else { break; } } return num; } /* * 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: num. of bytes read. < 0 on error. */ static int ebml_read_num (MatroskaDemuxContext *matroska, int max_size, uint64_t *number) { ByteIOContext *pb = &matroska->ctx->pb; int len_mask = 0x80, read = 1, n = 1; int64_t total = 0; /* the first byte tells us the length in bytes - get_byte() 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 = get_byte(pb))) { /* we might encounter EOS here */ if (!url_feof(pb)) { offset_t pos = url_ftell(pb); av_log(matroska->ctx, AV_LOG_ERROR, "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos); } return AVERROR_IO; /* EOS or actual I/O error */ } /* get the length of the EBML number */ while (read <= max_size && !(total & len_mask)) { read++; len_mask >>= 1; } if (read > max_size) { offset_t pos = url_ftell(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 &= ~len_mask; while (n++ < read) total = (total << 8) | get_byte(pb); *number = total; return read; } /* * Read: the element content data ID. * Return: the number of bytes read or < 0 on error. */ static int ebml_read_element_id (MatroskaDemuxContext *matroska, uint32_t *id, int *level_up) { int read; uint64_t total; /* if we re-call this, use our cached ID */ if (matroska->peek_id != 0) { if (level_up) *level_up = 0; *id = matroska->peek_id; return 0; } /* read out the "EBML number", include tag in ID */ if ((read = ebml_read_num(matroska, 4, &total)) < 0) return read; *id = matroska->peek_id = total | (1 << (read * 7)); /* level tracking */ if (level_up) *level_up = ebml_read_element_level_up(matroska); return read; } /* * Read: element content length. * Return: the number of bytes read or < 0 on error. */ static int ebml_read_element_length (MatroskaDemuxContext *matroska, uint64_t *length) { /* clear cache since we're now beyond that data point */ matroska->peek_id = 0; /* read out the "EBML number", include tag in ID */ return ebml_read_num(matroska, 8, length); } /* * Return: the ID of the next element, or 0 on error. * Level_up contains the amount of levels that this * next element lies higher than the previous one. */ static uint32_t ebml_peek_id (MatroskaDemuxContext *matroska, int *level_up) { uint32_t id; assert(level_up != NULL); if (ebml_read_element_id(matroska, &id, level_up) < 0) return 0; return id; } /* * Seek to a given offset. * 0 is success, -1 is failure. */ static int ebml_read_seek (MatroskaDemuxContext *matroska, offset_t offset) { ByteIOContext *pb = &matroska->ctx->pb; /* clear ID cache, if any */ matroska->peek_id = 0; return (url_fseek(pb, offset, SEEK_SET) == offset) ? 0 : -1; } /* * Skip the next element. * 0 is success, -1 is failure. */ static int ebml_read_skip (MatroskaDemuxContext *matroska) { ByteIOContext *pb = &matroska->ctx->pb; uint32_t id; uint64_t length; int res; if ((res = ebml_read_element_id(matroska, &id, NULL)) < 0 || (res = ebml_read_element_length(matroska, &length)) < 0) return res; url_fskip(pb, length); return 0; } /* * Read the next element as an unsigned int. * 0 is success, < 0 is failure. */ static int ebml_read_uint (MatroskaDemuxContext *matroska, uint32_t *id, uint64_t *num) { ByteIOContext *pb = &matroska->ctx->pb; int n = 0, size, res; uint64_t rlength; if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 || (res = ebml_read_element_length(matroska, &rlength)) < 0) return res; size = rlength; if (size < 1 || size > 8) { offset_t pos = url_ftell(pb); av_log(matroska->ctx, AV_LOG_ERROR, "Invalid uint element size %d at position %"PRId64" (0x%"PRIx64")\n", size, pos, pos); return AVERROR_INVALIDDATA; } /* big-endian ordening; build up number */ *num = 0; while (n++ < size) *num = (*num << 8) | get_byte(pb); return 0; } /* * Read the next element as a signed int. * 0 is success, < 0 is failure. */ static int ebml_read_sint (MatroskaDemuxContext *matroska, uint32_t *id, int64_t *num) { ByteIOContext *pb = &matroska->ctx->pb; int size, n = 1, negative = 0, res; uint64_t rlength; if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 || (res = ebml_read_element_length(matroska, &rlength)) < 0) return res; size = rlength; if (size < 1 || size > 8) { offset_t pos = url_ftell(pb); av_log(matroska->ctx, AV_LOG_ERROR, "Invalid sint element size %d at position %"PRId64" (0x%"PRIx64")\n", size, pos, pos); return AVERROR_INVALIDDATA; } if ((*num = get_byte(pb)) & 0x80) { negative = 1; *num &= ~0x80; } *num = 0; while (n++ < size) *num = (*num << 8) | get_byte(pb); /* make signed */ if (negative) *num = *num - (1LL << ((8 * size) - 1)); return 0; } /* * Read the next element as a float. * 0 is success, < 0 is failure. */ static int ebml_read_float (MatroskaDemuxContext *matroska, uint32_t *id, double *num) { ByteIOContext *pb = &matroska->ctx->pb; int size, res; uint64_t rlength; if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 || (res = ebml_read_element_length(matroska, &rlength)) < 0) return res; size = rlength; if (size == 4) { *num= av_int2flt(get_be32(pb)); } else if(size==8){ *num= av_int2dbl(get_be64(pb)); } else{ offset_t pos = url_ftell(pb); av_log(matroska->ctx, AV_LOG_ERROR, "Invalid float element size %d at position %"PRIu64" (0x%"PRIx64")\n", size, pos, pos); return AVERROR_INVALIDDATA; } return 0; } /* * Read the next element as an ASCII string. * 0 is success, < 0 is failure. */ static int ebml_read_ascii (MatroskaDemuxContext *matroska, uint32_t *id, char **str) { ByteIOContext *pb = &matroska->ctx->pb; int size, res; uint64_t rlength; if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 || (res = ebml_read_element_length(matroska, &rlength)) < 0) return res; size = rlength; /* ebml strings are usually not 0-terminated, so we allocate one * byte more, read the string and NULL-terminate it ourselves. */ if (size < 0 || !(*str = av_malloc(size + 1))) { av_log(matroska->ctx, AV_LOG_ERROR, "Memory allocation failed\n"); return AVERROR_NOMEM; } if (get_buffer(pb, (uint8_t *) *str, size) != size) { offset_t pos = url_ftell(pb); av_log(matroska->ctx, AV_LOG_ERROR, "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos); return AVERROR_IO; } (*str)[size] = '\0'; return 0; } /* * Read the next element as a UTF-8 string. * 0 is success, < 0 is failure. */ static int ebml_read_utf8 (MatroskaDemuxContext *matroska, uint32_t *id, char **str) { return ebml_read_ascii(matroska, id, str); } /* * Read the next element as a date (nanoseconds since 1/1/2000). * 0 is success, < 0 is failure. */ static int ebml_read_date (MatroskaDemuxContext *matroska, uint32_t *id, int64_t *date) { return ebml_read_sint(matroska, id, date); } /* * 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, uint32_t *id) { ByteIOContext *pb = &matroska->ctx->pb; uint64_t length; MatroskaLevel *level; int res; if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 || (res = ebml_read_element_length(matroska, &length)) < 0) return res; /* protect... (Heaven forbids that the '>' is true) */ 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_NOTSUPP; } /* remember level */ level = &matroska->levels[matroska->num_levels++]; level->start = url_ftell(pb); level->length = length; return 0; } /* * Read the next element as binary data. * 0 is success, < 0 is failure. */ static int ebml_read_binary (MatroskaDemuxContext *matroska, uint32_t *id, uint8_t **binary, int *size) { ByteIOContext *pb = &matroska->ctx->pb; uint64_t rlength; int res; if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 || (res = ebml_read_element_length(matroska, &rlength)) < 0) return res; *size = rlength; if (!(*binary = av_malloc(*size))) { av_log(matroska->ctx, AV_LOG_ERROR, "Memory allocation error\n"); return AVERROR_NOMEM; } if (get_buffer(pb, *binary, *size) != *size) { offset_t pos = url_ftell(pb); av_log(matroska->ctx, AV_LOG_ERROR, "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos); return AVERROR_IO; } return 0; } /* * Read signed/unsigned "EBML" numbers. * Return: number of bytes processed, < 0 on error. * XXX: use ebml_read_num(). */ static int matroska_ebmlnum_uint (uint8_t *data, uint32_t size, uint64_t *num) { int len_mask = 0x80, read = 1, n = 1, num_ffs = 0; uint64_t total; if (size <= 0) return AVERROR_INVALIDDATA; total = data[0]; while (read <= 8 && !(total & len_mask)) { read++; len_mask >>= 1; } if (read > 8) return AVERROR_INVALIDDATA; if ((total &= (len_mask - 1)) == len_mask - 1) num_ffs++; if (size < read) return AVERROR_INVALIDDATA; while (n < read) { if (data[n] == 0xff) num_ffs++; total = (total << 8) | data[n]; n++; } if (read == num_ffs) *num = (uint64_t)-1; else *num = total; return read; } /* * Same as above, but signed. */ static int matroska_ebmlnum_sint (uint8_t *data, uint32_t size, int64_t *num) { uint64_t unum; int res; /* read as unsigned number first */ if ((res = matroska_ebmlnum_uint(data, size, &unum)) < 0) return res; /* make signed (weird way) */ if (unum == (uint64_t)-1) *num = INT64_MAX; else *num = unum - ((1LL << ((7 * res) - 1)) - 1); return res; } /* * Read an EBML header. * 0 is success, < 0 is failure. */ static int ebml_read_header (MatroskaDemuxContext *matroska, char **doctype, int *version) { uint32_t id; int level_up, res = 0; /* default init */ if (doctype) *doctype = NULL; if (version) *version = 1; if (!(id = ebml_peek_id(matroska, &level_up)) || level_up != 0 || id != EBML_ID_HEADER) { av_log(matroska->ctx, AV_LOG_ERROR, "This is not an EBML file (id=0x%x/0x%x)\n", id, EBML_ID_HEADER); return AVERROR_INVALIDDATA; } if ((res = ebml_read_master(matroska, &id)) < 0) return res; while (res == 0) { if (!(id = ebml_peek_id(matroska, &level_up))) return AVERROR_IO; /* end-of-header */ if (level_up) break; switch (id) { /* is our read version uptodate? */ case EBML_ID_EBMLREADVERSION: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) return res; if (num > EBML_VERSION) { av_log(matroska->ctx, AV_LOG_ERROR, "EBML version %"PRIu64" (> %d) is not supported\n", num, EBML_VERSION); return AVERROR_INVALIDDATA; } break; } /* we only handle 8 byte lengths at max */ case EBML_ID_EBMLMAXSIZELENGTH: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) return res; if (num > sizeof(uint64_t)) { av_log(matroska->ctx, AV_LOG_ERROR, "Integers of size %"PRIu64" (> %zd) not supported\n", num, sizeof(uint64_t)); return AVERROR_INVALIDDATA; } break; } /* we handle 4 byte IDs at max */ case EBML_ID_EBMLMAXIDLENGTH: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) return res; if (num > sizeof(uint32_t)) { av_log(matroska->ctx, AV_LOG_ERROR, "IDs of size %"PRIu64" (> %zu) not supported\n", num, sizeof(uint32_t)); return AVERROR_INVALIDDATA; } break; } case EBML_ID_DOCTYPE: { char *text; if ((res = ebml_read_ascii(matroska, &id, &text)) < 0) return res; if (doctype) { if (*doctype) av_free(*doctype); *doctype = text; } else av_free(text); break; } case EBML_ID_DOCTYPEREADVERSION: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) return res; if (version) *version = num; break; } default: av_log(matroska->ctx, AV_LOG_INFO, "Unknown data type 0x%x in EBML header", id); /* pass-through */ case EBML_ID_VOID: /* we ignore these two, as they don't tell us anything we * care about */ case EBML_ID_EBMLVERSION: case EBML_ID_DOCTYPEVERSION: res = ebml_read_skip (matroska); break; } } 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) { memmove(&matroska->packets[0], &matroska->packets[1], (matroska->num_packets - 1) * sizeof(AVPacket *)); matroska->packets = av_realloc(matroska->packets, (matroska->num_packets - 1) * sizeof(AVPacket *)); } else { av_freep(&matroska->packets); } matroska->num_packets--; return 0; } return -1; } /* * Put a packet into our internal queue. Will be delivered to the * user/application during the next get_packet() call. */ static void matroska_queue_packet (MatroskaDemuxContext *matroska, AVPacket *pkt) { matroska->packets = av_realloc(matroska->packets, (matroska->num_packets + 1) * sizeof(AVPacket *)); matroska->packets[matroska->num_packets] = pkt; matroska->num_packets++; } /* * Autodetecting... */ static int matroska_probe (AVProbeData *p) { uint64_t total = 0; int len_mask = 0x80, size = 1, n = 1; uint8_t probe_data[] = { 'm', 'a', 't', 'r', 'o', 's', 'k', 'a' }; if (p->buf_size < 5) return 0; /* ebml header? */ if ((p->buf[0] << 24 | p->buf[1] << 16 | p->buf[2] << 8 | p->buf[3]) != 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 must contain the document type 'matroska'. 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 (n = 4 + size; n < 4 + size + total - sizeof(probe_data); n++) if (!memcmp (&p->buf[n], probe_data, sizeof(probe_data))) return AVPROBE_SCORE_MAX; return 0; } /* * From here on, it's all XML-style DTD stuff... Needs no comments. */ static int matroska_parse_info (MatroskaDemuxContext *matroska) { int res = 0; uint32_t id; av_log(matroska->ctx, AV_LOG_DEBUG, "Parsing info...\n"); while (res == 0) { if (!(id = ebml_peek_id(matroska, &matroska->level_up))) { res = AVERROR_IO; break; } else if (matroska->level_up) { matroska->level_up--; break; } switch (id) { /* cluster timecode */ case MATROSKA_ID_TIMECODESCALE: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; matroska->time_scale = num; break; } case MATROSKA_ID_DURATION: { double num; if ((res = ebml_read_float(matroska, &id, &num)) < 0) break; matroska->ctx->duration = num * matroska->time_scale * 1000 / AV_TIME_BASE; break; } case MATROSKA_ID_TITLE: { char *text; if ((res = ebml_read_utf8(matroska, &id, &text)) < 0) break; strncpy(matroska->ctx->title, text, sizeof(matroska->ctx->title)-1); av_free(text); break; } case MATROSKA_ID_WRITINGAPP: { char *text; if ((res = ebml_read_utf8(matroska, &id, &text)) < 0) break; matroska->writing_app = text; break; } case MATROSKA_ID_MUXINGAPP: { char *text; if ((res = ebml_read_utf8(matroska, &id, &text)) < 0) break; matroska->muxing_app = text; break; } case MATROSKA_ID_DATEUTC: { int64_t time; if ((res = ebml_read_date(matroska, &id, &time)) < 0) break; matroska->created = time; break; } default: av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%x in info header\n", id); /* fall-through */ case EBML_ID_VOID: res = ebml_read_skip(matroska); break; } if (matroska->level_up) { matroska->level_up--; break; } } return res; } static int matroska_add_stream (MatroskaDemuxContext *matroska) { int res = 0; uint32_t id; MatroskaTrack *track; av_log(matroska->ctx, AV_LOG_DEBUG, "parsing track, adding stream..,\n"); /* Allocate a generic track. As soon as we know its type we'll realloc. */ track = av_mallocz(sizeof(MatroskaTrack)); matroska->num_tracks++; /* start with the master */ if ((res = ebml_read_master(matroska, &id)) < 0) return res; /* try reading the trackentry headers */ while (res == 0) { if (!(id = ebml_peek_id(matroska, &matroska->level_up))) { res = AVERROR_IO; break; } else if (matroska->level_up > 0) { matroska->level_up--; break; } switch (id) { /* track number (unique stream ID) */ case MATROSKA_ID_TRACKNUMBER: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; track->num = num; break; } /* track UID (unique identifier) */ case MATROSKA_ID_TRACKUID: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; track->uid = num; break; } /* track type (video, audio, combined, subtitle, etc.) */ case MATROSKA_ID_TRACKTYPE: { uint64_t num; if (track->type != 0) { av_log(matroska->ctx, AV_LOG_INFO, "More than one tracktype in an entry - skip\n"); break; } if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; track->type = num; /* ok, so we're actually going to reallocate this thing */ switch (track->type) { case MATROSKA_TRACK_TYPE_VIDEO: track = (MatroskaTrack *) av_realloc(track, sizeof(MatroskaVideoTrack)); break; case MATROSKA_TRACK_TYPE_AUDIO: track = (MatroskaTrack *) av_realloc(track, sizeof(MatroskaAudioTrack)); ((MatroskaAudioTrack *)track)->channels = 1; ((MatroskaAudioTrack *)track)->samplerate = 8000; break; case MATROSKA_TRACK_TYPE_SUBTITLE: track = (MatroskaTrack *) av_realloc(track, sizeof(MatroskaSubtitleTrack)); break; case MATROSKA_TRACK_TYPE_COMPLEX: case MATROSKA_TRACK_TYPE_LOGO: case MATROSKA_TRACK_TYPE_CONTROL: default: av_log(matroska->ctx, AV_LOG_INFO, "Unknown or unsupported track type 0x%x\n", track->type); track->type = 0; break; } matroska->tracks[matroska->num_tracks - 1] = track; break; } /* tracktype specific stuff for video */ case MATROSKA_ID_TRACKVIDEO: { MatroskaVideoTrack *videotrack; if (track->type != MATROSKA_TRACK_TYPE_VIDEO) { av_log(matroska->ctx, AV_LOG_INFO, "video data in non-video track - ignoring\n"); res = AVERROR_INVALIDDATA; break; } else if ((res = ebml_read_master(matroska, &id)) < 0) break; videotrack = (MatroskaVideoTrack *)track; while (res == 0) { if (!(id = ebml_peek_id(matroska, &matroska->level_up))) { res = AVERROR_IO; break; } else if (matroska->level_up > 0) { matroska->level_up--; break; } switch (id) { /* fixme, this should be one-up, but I get it here */ case MATROSKA_ID_TRACKDEFAULTDURATION: { uint64_t num; if ((res = ebml_read_uint (matroska, &id, &num)) < 0) break; track->default_duration = num; break; } /* video framerate */ case MATROSKA_ID_VIDEOFRAMERATE: { double num; if ((res = ebml_read_float(matroska, &id, &num)) < 0) break; track->default_duration = 1000000000 * (1. / num); break; } /* width of the size to display the video at */ case MATROSKA_ID_VIDEODISPLAYWIDTH: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; videotrack->display_width = num; break; } /* height of the size to display the video at */ case MATROSKA_ID_VIDEODISPLAYHEIGHT: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; videotrack->display_height = num; break; } /* width of the video in the file */ case MATROSKA_ID_VIDEOPIXELWIDTH: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; videotrack->pixel_width = num; break; } /* height of the video in the file */ case MATROSKA_ID_VIDEOPIXELHEIGHT: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; videotrack->pixel_height = num; break; } /* whether the video is interlaced */ case MATROSKA_ID_VIDEOFLAGINTERLACED: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; if (num) track->flags |= MATROSKA_VIDEOTRACK_INTERLACED; else track->flags &= ~MATROSKA_VIDEOTRACK_INTERLACED; break; } /* stereo mode (whether the video has two streams, * where one is for the left eye and the other for * the right eye, which creates a 3D-like * effect) */ case MATROSKA_ID_VIDEOSTEREOMODE: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; if (num != MATROSKA_EYE_MODE_MONO && num != MATROSKA_EYE_MODE_LEFT && num != MATROSKA_EYE_MODE_RIGHT && num != MATROSKA_EYE_MODE_BOTH) { av_log(matroska->ctx, AV_LOG_INFO, "Ignoring unknown eye mode 0x%x\n", (uint32_t) num); break; } videotrack->eye_mode = num; break; } /* aspect ratio behaviour */ case MATROSKA_ID_VIDEOASPECTRATIO: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; if (num != MATROSKA_ASPECT_RATIO_MODE_FREE && num != MATROSKA_ASPECT_RATIO_MODE_KEEP && num != MATROSKA_ASPECT_RATIO_MODE_FIXED) { av_log(matroska->ctx, AV_LOG_INFO, "Ignoring unknown aspect ratio 0x%x\n", (uint32_t) num); break; } videotrack->ar_mode = num; break; } /* colourspace (only matters for raw video) * fourcc */ case MATROSKA_ID_VIDEOCOLOURSPACE: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; videotrack->fourcc = num; break; } default: av_log(matroska->ctx, AV_LOG_INFO, "Unknown video track header entry " "0x%x - ignoring\n", id); /* pass-through */ case EBML_ID_VOID: res = ebml_read_skip(matroska); break; } if (matroska->level_up) { matroska->level_up--; break; } } break; } /* tracktype specific stuff for audio */ case MATROSKA_ID_TRACKAUDIO: { MatroskaAudioTrack *audiotrack; if (track->type != MATROSKA_TRACK_TYPE_AUDIO) { av_log(matroska->ctx, AV_LOG_INFO, "audio data in non-audio track - ignoring\n"); res = AVERROR_INVALIDDATA; break; } else if ((res = ebml_read_master(matroska, &id)) < 0) break; audiotrack = (MatroskaAudioTrack *)track; while (res == 0) { if (!(id = ebml_peek_id(matroska, &matroska->level_up))) { res = AVERROR_IO; break; } else if (matroska->level_up > 0) { matroska->level_up--; break; } switch (id) { /* samplerate */ case MATROSKA_ID_AUDIOSAMPLINGFREQ: { double num; if ((res = ebml_read_float(matroska, &id, &num)) < 0) break; audiotrack->internal_samplerate = audiotrack->samplerate = num; break; } case MATROSKA_ID_AUDIOOUTSAMPLINGFREQ: { double num; if ((res = ebml_read_float(matroska, &id, &num)) < 0) break; audiotrack->samplerate = num; break; } /* bitdepth */ case MATROSKA_ID_AUDIOBITDEPTH: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; audiotrack->bitdepth = num; break; } /* channels */ case MATROSKA_ID_AUDIOCHANNELS: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; audiotrack->channels = num; break; } default: av_log(matroska->ctx, AV_LOG_INFO, "Unknown audio track header entry " "0x%x - ignoring\n", id); /* pass-through */ case EBML_ID_VOID: res = ebml_read_skip(matroska); break; } if (matroska->level_up) { matroska->level_up--; break; } } break; } /* codec identifier */ case MATROSKA_ID_CODECID: { char *text; if ((res = ebml_read_ascii(matroska, &id, &text)) < 0) break; track->codec_id = text; break; } /* codec private data */ case MATROSKA_ID_CODECPRIVATE: { uint8_t *data; int size; if ((res = ebml_read_binary(matroska, &id, &data, &size) < 0)) break; track->codec_priv = data; track->codec_priv_size = size; break; } /* name of the codec */ case MATROSKA_ID_CODECNAME: { char *text; if ((res = ebml_read_utf8(matroska, &id, &text)) < 0) break; track->codec_name = text; break; } /* name of this track */ case MATROSKA_ID_TRACKNAME: { char *text; if ((res = ebml_read_utf8(matroska, &id, &text)) < 0) break; track->name = text; break; } /* language (matters for audio/subtitles, mostly) */ case MATROSKA_ID_TRACKLANGUAGE: { char *text; if ((res = ebml_read_utf8(matroska, &id, &text)) < 0) break; track->language = text; break; } /* whether this is actually used */ case MATROSKA_ID_TRACKFLAGENABLED: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; if (num) track->flags |= MATROSKA_TRACK_ENABLED; else track->flags &= ~MATROSKA_TRACK_ENABLED; break; } /* whether it's the default for this track type */ case MATROSKA_ID_TRACKFLAGDEFAULT: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; if (num) track->flags |= MATROSKA_TRACK_DEFAULT; else track->flags &= ~MATROSKA_TRACK_DEFAULT; break; } /* lacing (like MPEG, where blocks don't end/start on frame * boundaries) */ case MATROSKA_ID_TRACKFLAGLACING: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; if (num) track->flags |= MATROSKA_TRACK_LACING; else track->flags &= ~MATROSKA_TRACK_LACING; break; } /* default length (in time) of one data block in this track */ case MATROSKA_ID_TRACKDEFAULTDURATION: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; track->default_duration = num; break; } default: av_log(matroska->ctx, AV_LOG_INFO, "Unknown track header entry 0x%x - ignoring\n", id); /* pass-through */ case EBML_ID_VOID: /* we ignore these because they're nothing useful. */ case MATROSKA_ID_CODECINFOURL: case MATROSKA_ID_CODECDOWNLOADURL: case MATROSKA_ID_TRACKMINCACHE: case MATROSKA_ID_TRACKMAXCACHE: res = ebml_read_skip(matroska); break; } if (matroska->level_up) { matroska->level_up--; break; } } return res; } static int matroska_parse_tracks (MatroskaDemuxContext *matroska) { int res = 0; uint32_t id; av_log(matroska->ctx, AV_LOG_DEBUG, "parsing tracks...\n"); while (res == 0) { if (!(id = ebml_peek_id(matroska, &matroska->level_up))) { res = AVERROR_IO; break; } else if (matroska->level_up) { matroska->level_up--; break; } switch (id) { /* one track within the "all-tracks" header */ case MATROSKA_ID_TRACKENTRY: res = matroska_add_stream(matroska); break; default: av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%x in track header\n", id); /* fall-through */ case EBML_ID_VOID: res = ebml_read_skip(matroska); break; } if (matroska->level_up) { matroska->level_up--; break; } } return res; } static int matroska_parse_index (MatroskaDemuxContext *matroska) { int res = 0; uint32_t id; MatroskaDemuxIndex idx; av_log(matroska->ctx, AV_LOG_DEBUG, "parsing index...\n"); while (res == 0) { if (!(id = ebml_peek_id(matroska, &matroska->level_up))) { res = AVERROR_IO; break; } else if (matroska->level_up) { matroska->level_up--; break; } switch (id) { /* one single index entry ('point') */ case MATROSKA_ID_POINTENTRY: if ((res = ebml_read_master(matroska, &id)) < 0) break; /* in the end, we hope to fill one entry with a * timestamp, a file position and a tracknum */ idx.pos = (uint64_t) -1; idx.time = (uint64_t) -1; idx.track = (uint16_t) -1; while (res == 0) { if (!(id = ebml_peek_id(matroska, &matroska->level_up))) { res = AVERROR_IO; break; } else if (matroska->level_up) { matroska->level_up--; break; } switch (id) { /* one single index entry ('point') */ case MATROSKA_ID_CUETIME: { uint64_t time; if ((res = ebml_read_uint(matroska, &id, &time)) < 0) break; idx.time = time * matroska->time_scale; break; } /* position in the file + track to which it * belongs */ case MATROSKA_ID_CUETRACKPOSITION: if ((res = ebml_read_master(matroska, &id)) < 0) break; while (res == 0) { if (!(id = ebml_peek_id (matroska, &matroska->level_up))) { res = AVERROR_IO; break; } else if (matroska->level_up) { matroska->level_up--; break; } switch (id) { /* track number */ case MATROSKA_ID_CUETRACK: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; idx.track = num; break; } /* position in file */ case MATROSKA_ID_CUECLUSTERPOSITION: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; idx.pos = num; break; } default: av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%x in " "CuesTrackPositions\n", id); /* fall-through */ case EBML_ID_VOID: res = ebml_read_skip(matroska); break; } if (matroska->level_up) { matroska->level_up--; break; } } break; default: av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%x in cuespoint " "index\n", id); /* fall-through */ case EBML_ID_VOID: res = ebml_read_skip(matroska); break; } if (matroska->level_up) { matroska->level_up--; break; } } /* so let's see if we got what we wanted */ if (idx.pos != (uint64_t) -1 && idx.time != (uint64_t) -1 && idx.track != (uint16_t) -1) { if (matroska->num_indexes % 32 == 0) { /* re-allocate bigger index */ matroska->index = av_realloc(matroska->index, (matroska->num_indexes + 32) * sizeof(MatroskaDemuxIndex)); } matroska->index[matroska->num_indexes] = idx; matroska->num_indexes++; } break; default: av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%x in cues header\n", id); /* fall-through */ case EBML_ID_VOID: res = ebml_read_skip(matroska); break; } if (matroska->level_up) { matroska->level_up--; break; } } return res; } static int matroska_parse_metadata (MatroskaDemuxContext *matroska) { int res = 0; uint32_t id; while (res == 0) { if (!(id = ebml_peek_id(matroska, &matroska->level_up))) { res = AVERROR_IO; break; } else if (matroska->level_up) { matroska->level_up--; break; } switch (id) { /* Hm, this is unsupported... */ default: av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%x in metadata header\n", id); /* fall-through */ case EBML_ID_VOID: res = ebml_read_skip(matroska); break; } if (matroska->level_up) { matroska->level_up--; break; } } return res; } static int matroska_parse_seekhead (MatroskaDemuxContext *matroska) { int res = 0; uint32_t id; av_log(matroska->ctx, AV_LOG_DEBUG, "parsing seekhead...\n"); while (res == 0) { if (!(id = ebml_peek_id(matroska, &matroska->level_up))) { res = AVERROR_IO; break; } else if (matroska->level_up) { matroska->level_up--; break; } switch (id) { case MATROSKA_ID_SEEKENTRY: { uint32_t seek_id = 0, peek_id_cache = 0; uint64_t seek_pos = (uint64_t) -1, t; if ((res = ebml_read_master(matroska, &id)) < 0) break; while (res == 0) { if (!(id = ebml_peek_id(matroska, &matroska->level_up))) { res = AVERROR_IO; break; } else if (matroska->level_up) { matroska->level_up--; break; } switch (id) { case MATROSKA_ID_SEEKID: res = ebml_read_uint(matroska, &id, &t); seek_id = t; break; case MATROSKA_ID_SEEKPOSITION: res = ebml_read_uint(matroska, &id, &seek_pos); break; default: av_log(matroska->ctx, AV_LOG_INFO, "Unknown seekhead ID 0x%x\n", id); /* fall-through */ case EBML_ID_VOID: res = ebml_read_skip(matroska); break; } if (matroska->level_up) { matroska->level_up--; break; } } if (!seek_id || seek_pos == (uint64_t) -1) { av_log(matroska->ctx, AV_LOG_INFO, "Incomplete seekhead entry (0x%x/%"PRIu64")\n", seek_id, seek_pos); break; } switch (seek_id) { case MATROSKA_ID_CUES: case MATROSKA_ID_TAGS: { uint32_t level_up = matroska->level_up; offset_t before_pos; uint64_t length; MatroskaLevel level; /* remember the peeked ID and the current position */ peek_id_cache = matroska->peek_id; before_pos = url_ftell(&matroska->ctx->pb); /* seek */ if ((res = ebml_read_seek(matroska, seek_pos + matroska->segment_start)) < 0) return res; /* 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); return AVERROR_UNKNOWN; } level.start = 0; level.length = (uint64_t)-1; matroska->levels[matroska->num_levels] = level; matroska->num_levels++; /* check ID */ if (!(id = ebml_peek_id (matroska, &matroska->level_up))) goto finish; if (id != seek_id) { av_log(matroska->ctx, AV_LOG_INFO, "We looked for ID=0x%x but got " "ID=0x%x (pos=%"PRIu64")", seek_id, id, seek_pos + matroska->segment_start); goto finish; } /* read master + parse */ if ((res = ebml_read_master(matroska, &id)) < 0) goto finish; switch (id) { case MATROSKA_ID_CUES: if (!(res = matroska_parse_index(matroska)) || url_feof(&matroska->ctx->pb)) { matroska->index_parsed = 1; res = 0; } break; case MATROSKA_ID_TAGS: if (!(res = matroska_parse_metadata(matroska)) || url_feof(&matroska->ctx->pb)) { matroska->metadata_parsed = 1; res = 0; } break; } finish: /* remove dummy level */ while (matroska->num_levels) { matroska->num_levels--; length = matroska->levels[matroska->num_levels].length; if (length == (uint64_t)-1) break; } /* seek back */ if ((res = ebml_read_seek(matroska, before_pos)) < 0) return res; matroska->peek_id = peek_id_cache; matroska->level_up = level_up; break; } default: av_log(matroska->ctx, AV_LOG_INFO, "Ignoring seekhead entry for ID=0x%x\n", seek_id); break; } break; } default: av_log(matroska->ctx, AV_LOG_INFO, "Unknown seekhead ID 0x%x\n", id); /* fall-through */ case EBML_ID_VOID: res = ebml_read_skip(matroska); break; } if (matroska->level_up) { matroska->level_up--; break; } } return res; } #define ARRAY_SIZE(x) (sizeof(x)/sizeof(*x)) static int matroska_aac_profile (char *codec_id) { static const char *aac_profiles[] = { "MAIN", "LC", "SSR" }; int profile; for (profile=0; profilepriv_data; char *doctype; int version, last_level, res = 0; uint32_t id; matroska->ctx = s; /* First read the EBML header. */ doctype = NULL; if ((res = ebml_read_header(matroska, &doctype, &version)) < 0) return res; if ((doctype == NULL) || strcmp(doctype, "matroska")) { av_log(matroska->ctx, AV_LOG_ERROR, "Wrong EBML doctype ('%s' != 'matroska').\n", doctype ? doctype : "(none)"); if (doctype) av_free(doctype); return AVERROR_NOFMT; } av_free(doctype); if (version != 1) { av_log(matroska->ctx, AV_LOG_ERROR, "Matroska demuxer version 1 too old for file version %d\n", version); return AVERROR_NOFMT; } /* The next thing is a segment. */ while (1) { if (!(id = ebml_peek_id(matroska, &last_level))) return AVERROR_IO; if (id == MATROSKA_ID_SEGMENT) break; /* oi! */ av_log(matroska->ctx, AV_LOG_INFO, "Expected a Segment ID (0x%x), but received 0x%x!\n", MATROSKA_ID_SEGMENT, id); if ((res = ebml_read_skip(matroska)) < 0) return res; } /* We now have a Matroska segment. * Seeks are from the beginning of the segment, * after the segment ID/length. */ if ((res = ebml_read_master(matroska, &id)) < 0) return res; matroska->segment_start = url_ftell(&s->pb); matroska->time_scale = 1000000; /* we've found our segment, start reading the different contents in here */ while (res == 0) { if (!(id = ebml_peek_id(matroska, &matroska->level_up))) { res = AVERROR_IO; break; } else if (matroska->level_up) { matroska->level_up--; break; } switch (id) { /* stream info */ case MATROSKA_ID_INFO: { if ((res = ebml_read_master(matroska, &id)) < 0) break; res = matroska_parse_info(matroska); break; } /* track info headers */ case MATROSKA_ID_TRACKS: { if ((res = ebml_read_master(matroska, &id)) < 0) break; res = matroska_parse_tracks(matroska); break; } /* stream index */ case MATROSKA_ID_CUES: { if (!matroska->index_parsed) { if ((res = ebml_read_master(matroska, &id)) < 0) break; res = matroska_parse_index(matroska); } else res = ebml_read_skip(matroska); break; } /* metadata */ case MATROSKA_ID_TAGS: { if (!matroska->metadata_parsed) { if ((res = ebml_read_master(matroska, &id)) < 0) break; res = matroska_parse_metadata(matroska); } else res = ebml_read_skip(matroska); break; } /* file index (if seekable, seek to Cues/Tags to parse it) */ case MATROSKA_ID_SEEKHEAD: { if ((res = ebml_read_master(matroska, &id)) < 0) break; res = matroska_parse_seekhead(matroska); break; } case MATROSKA_ID_CLUSTER: { /* Do not read the master - this will be done in the next * call to matroska_read_packet. */ res = 1; break; } default: av_log(matroska->ctx, AV_LOG_INFO, "Unknown matroska file header ID 0x%x\n", id); /* fall-through */ case EBML_ID_VOID: res = ebml_read_skip(matroska); break; } if (matroska->level_up) { matroska->level_up--; break; } } /* Have we found a cluster? */ if (ebml_peek_id(matroska, NULL) == MATROSKA_ID_CLUSTER) { int i, j; MatroskaTrack *track; AVStream *st; for (i = 0; i < matroska->num_tracks; i++) { enum CodecID codec_id = CODEC_ID_NONE; uint8_t *extradata = NULL; int extradata_size = 0; track = matroska->tracks[i]; /* libavformat does not really support subtitles. * Also apply some sanity checks. */ if ((track->type == MATROSKA_TRACK_TYPE_SUBTITLE) || (track->codec_id == NULL)) continue; for(j=0; codec_tags[j].str; j++){ if(!strncmp(codec_tags[j].str, track->codec_id, strlen(codec_tags[j].str))){ codec_id= codec_tags[j].id; break; } } /* Set the FourCC from the CodecID. */ /* This is the MS compatibility mode which stores a * BITMAPINFOHEADER in the CodecPrivate. */ if (!strcmp(track->codec_id, MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC) && (track->codec_priv_size >= 40) && (track->codec_priv != NULL)) { unsigned char *p; /* Offset of biCompression. Stored in LE. */ p = (unsigned char *)track->codec_priv + 16; ((MatroskaVideoTrack *)track)->fourcc = (p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]; codec_id = codec_get_bmp_id(((MatroskaVideoTrack *)track)->fourcc); } /* This is the MS compatibility mode which stores a * WAVEFORMATEX in the CodecPrivate. */ else if (!strcmp(track->codec_id, MATROSKA_CODEC_ID_AUDIO_ACM) && (track->codec_priv_size >= 18) && (track->codec_priv != NULL)) { unsigned char *p; uint16_t tag; /* Offset of wFormatTag. Stored in LE. */ p = (unsigned char *)track->codec_priv; tag = (p[1] << 8) | p[0]; codec_id = codec_get_wav_id(tag); } else if (codec_id == CODEC_ID_AAC && !track->codec_priv_size) { MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *) track; int profile = matroska_aac_profile(track->codec_id); int sri = matroska_aac_sri(audiotrack->internal_samplerate); extradata = av_malloc(5); if (extradata == NULL) return AVERROR_NOMEM; extradata[0] = (profile << 3) | ((sri&0x0E) >> 1); extradata[1] = ((sri&0x01) << 7) | (audiotrack->channels<<3); if (strstr(track->codec_id, "SBR")) { sri = matroska_aac_sri(audiotrack->samplerate); extradata[2] = 0x56; extradata[3] = 0xE5; extradata[4] = 0x80 | (sri<<3); extradata_size = 5; } else { extradata_size = 2; } } if (codec_id == CODEC_ID_NONE) { av_log(matroska->ctx, AV_LOG_INFO, "Unknown/unsupported CodecID %s.\n", track->codec_id); } track->stream_index = matroska->num_streams; matroska->num_streams++; st = av_new_stream(s, track->stream_index); if (st == NULL) return AVERROR_NOMEM; av_set_pts_info(st, 64, matroska->time_scale, 1000*1000*1000); /* 64 bit pts in ns */ st->codec->codec_id = codec_id; if (track->default_duration) av_reduce(&st->codec->time_base.num, &st->codec->time_base.den, track->default_duration, 1000000000, 30000); if(extradata){ st->codec->extradata = extradata; st->codec->extradata_size = extradata_size; } else if(track->codec_priv && track->codec_priv_size > 0){ st->codec->extradata = av_malloc(track->codec_priv_size); if(st->codec->extradata == NULL) return AVERROR_NOMEM; st->codec->extradata_size = track->codec_priv_size; memcpy(st->codec->extradata, track->codec_priv, track->codec_priv_size); } if (track->type == MATROSKA_TRACK_TYPE_VIDEO) { MatroskaVideoTrack *videotrack = (MatroskaVideoTrack *)track; st->codec->codec_type = CODEC_TYPE_VIDEO; st->codec->codec_tag = videotrack->fourcc; st->codec->width = videotrack->pixel_width; st->codec->height = videotrack->pixel_height; if (videotrack->display_width == 0) videotrack->display_width= videotrack->pixel_width; if (videotrack->display_height == 0) videotrack->display_height= videotrack->pixel_height; av_reduce(&st->codec->sample_aspect_ratio.num, &st->codec->sample_aspect_ratio.den, st->codec->height * videotrack->display_width, st->codec-> width * videotrack->display_height, 255); } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) { MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *)track; st->codec->codec_type = CODEC_TYPE_AUDIO; st->codec->sample_rate = audiotrack->samplerate; st->codec->channels = audiotrack->channels; } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) { st->codec->codec_type = CODEC_TYPE_SUBTITLE; } /* What do we do with private data? E.g. for Vorbis. */ } res = 0; } return res; } static int matroska_find_track_by_num (MatroskaDemuxContext *matroska, int num) { int i; for (i = 0; i < matroska->num_tracks; i++) if (matroska->tracks[i]->num == num) return i; return -1; } static int matroska_parse_blockgroup (MatroskaDemuxContext *matroska, uint64_t cluster_time) { int res = 0; uint32_t id; AVPacket *pkt = NULL; int is_keyframe = PKT_FLAG_KEY, last_num_packets = matroska->num_packets; uint64_t duration = AV_NOPTS_VALUE; int track = -1; av_log(matroska->ctx, AV_LOG_DEBUG, "parsing blockgroup...\n"); while (res == 0) { if (!(id = ebml_peek_id(matroska, &matroska->level_up))) { res = AVERROR_IO; break; } else if (matroska->level_up) { matroska->level_up--; break; } switch (id) { /* one block inside the group. Note, block parsing is one * of the harder things, so this code is a bit complicated. * See http://www.matroska.org/ for documentation. */ case MATROSKA_ID_BLOCK: { uint8_t *data, *origdata; int size; int16_t block_time; uint32_t *lace_size = NULL; int n, flags, laces = 0; uint64_t num; int64_t pos= url_ftell(&matroska->ctx->pb); if ((res = ebml_read_binary(matroska, &id, &data, &size)) < 0) break; origdata = data; /* first byte(s): tracknum */ if ((n = matroska_ebmlnum_uint(data, size, &num)) < 0) { av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n"); av_free(origdata); break; } data += n; size -= n; /* fetch track from num */ track = matroska_find_track_by_num(matroska, num); if (size <= 3 || track < 0 || track >= matroska->num_tracks) { av_log(matroska->ctx, AV_LOG_INFO, "Invalid stream %d or size %u\n", track, size); av_free(origdata); break; } if(matroska->ctx->streams[ matroska->tracks[track]->stream_index ]->discard >= AVDISCARD_ALL){ av_free(origdata); break; } /* block_time (relative to cluster time) */ block_time = (data[0] << 8) | data[1]; data += 2; size -= 2; flags = *data; data += 1; size -= 1; switch ((flags & 0x06) >> 1) { case 0x0: /* no lacing */ laces = 1; lace_size = av_mallocz(sizeof(int)); lace_size[0] = size; break; case 0x1: /* xiph lacing */ case 0x2: /* fixed-size lacing */ case 0x3: /* EBML lacing */ if (size == 0) { res = -1; break; } laces = (*data) + 1; data += 1; size -= 1; lace_size = av_mallocz(laces * sizeof(int)); switch ((flags & 0x06) >> 1) { 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 = -1; break; } temp = *data; lace_size[n] += temp; data += 1; size -= 1; if (temp != 0xff) break; } total += lace_size[n]; } lace_size[n] = size - total; break; } case 0x2: /* fixed-size lacing */ for (n = 0; n < laces; n++) lace_size[n] = size / laces; break; case 0x3: /* EBML lacing */ { uint32_t total; n = matroska_ebmlnum_uint(data, size, &num); if (n < 0) { av_log(matroska->ctx, AV_LOG_INFO, "EBML block data error\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 (data, size, &snum); if (r < 0) { av_log(matroska->ctx, AV_LOG_INFO, "EBML block data error\n"); break; } data += r; size -= r; lace_size[n] = lace_size[n - 1] + snum; total += lace_size[n]; } lace_size[n] = size - total; break; } } break; } if (res == 0) { for (n = 0; n < laces; n++) { uint64_t timecode = AV_NOPTS_VALUE; pkt = av_mallocz(sizeof(AVPacket)); /* XXX: prevent data copy... */ if (av_new_packet(pkt,lace_size[n]) < 0) { res = AVERROR_NOMEM; break; } if (cluster_time != (uint64_t)-1 && n == 0) { if (cluster_time + block_time >= 0) timecode = cluster_time + block_time; } /* FIXME: duration */ memcpy(pkt->data, data, lace_size[n]); data += lace_size[n]; if (n == 0) pkt->flags = is_keyframe; pkt->stream_index = matroska->tracks[track]->stream_index; pkt->pts = timecode; pkt->pos= pos; matroska_queue_packet(matroska, pkt); } } av_free(lace_size); av_free(origdata); break; } case MATROSKA_ID_BLOCKDURATION: { if ((res = ebml_read_uint(matroska, &id, &duration)) < 0) break; break; } case MATROSKA_ID_BLOCKREFERENCE: /* We've found a reference, so not even the first frame in * the lace is a key frame. */ is_keyframe = 0; if (last_num_packets != matroska->num_packets) matroska->packets[last_num_packets]->flags = 0; res = ebml_read_skip(matroska); break; default: av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%x in blockgroup data\n", id); /* fall-through */ case EBML_ID_VOID: res = ebml_read_skip(matroska); break; } if (matroska->level_up) { matroska->level_up--; break; } } if (pkt) { if (duration != AV_NOPTS_VALUE) pkt->duration = duration; else if (track >= 0 && track < matroska->num_tracks) pkt->duration = matroska->tracks[track]->default_duration / matroska->time_scale; } return res; } static int matroska_parse_cluster (MatroskaDemuxContext *matroska) { int res = 0; uint32_t id; uint64_t cluster_time = 0; av_log(matroska->ctx, AV_LOG_DEBUG, "parsing cluster at %"PRId64"\n", url_ftell(&matroska->ctx->pb)); while (res == 0) { if (!(id = ebml_peek_id(matroska, &matroska->level_up))) { res = AVERROR_IO; break; } else if (matroska->level_up) { matroska->level_up--; break; } switch (id) { /* cluster timecode */ case MATROSKA_ID_CLUSTERTIMECODE: { uint64_t num; if ((res = ebml_read_uint(matroska, &id, &num)) < 0) break; cluster_time = num; break; } /* a group of blocks inside a cluster */ case MATROSKA_ID_BLOCKGROUP: if ((res = ebml_read_master(matroska, &id)) < 0) break; res = matroska_parse_blockgroup(matroska, cluster_time); break; default: av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%x in cluster data\n", id); /* fall-through */ case EBML_ID_VOID: res = ebml_read_skip(matroska); break; } if (matroska->level_up) { matroska->level_up--; break; } } return res; } static int matroska_read_packet (AVFormatContext *s, AVPacket *pkt) { MatroskaDemuxContext *matroska = s->priv_data; int res = 0; uint32_t id; /* Do we still have a packet queued? */ if (matroska_deliver_packet(matroska, pkt) == 0) return 0; /* Have we already reached the end? */ if (matroska->done) return AVERROR_IO; while (res == 0) { if (!(id = ebml_peek_id(matroska, &matroska->level_up))) { res = AVERROR_IO; break; } else if (matroska->level_up) { matroska->level_up--; break; } switch (id) { case MATROSKA_ID_CLUSTER: if ((res = ebml_read_master(matroska, &id)) < 0) break; if ((res = matroska_parse_cluster(matroska)) == 0) res = 1; /* Parsed one cluster, let's get out. */ break; default: case EBML_ID_VOID: res = ebml_read_skip(matroska); break; } if (matroska->level_up) { matroska->level_up--; break; } } if (res == -1) matroska->done = 1; return matroska_deliver_packet(matroska, pkt); } static int matroska_read_close (AVFormatContext *s) { MatroskaDemuxContext *matroska = s->priv_data; int n = 0; av_free(matroska->writing_app); av_free(matroska->muxing_app); av_free(matroska->index); if (matroska->packets != NULL) { for (n = 0; n < matroska->num_packets; n++) { av_free_packet(matroska->packets[n]); av_free(matroska->packets[n]); } av_free(matroska->packets); } for (n = 0; n < matroska->num_tracks; n++) { MatroskaTrack *track = matroska->tracks[n]; av_free(track->codec_id); av_free(track->codec_name); av_free(track->codec_priv); av_free(track->name); av_free(track->language); av_free(track); } return 0; } AVInputFormat matroska_demuxer = { "matroska", "Matroska file format", sizeof(MatroskaDemuxContext), matroska_probe, matroska_read_header, matroska_read_packet, matroska_read_close, };