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FFmpeg/libavformat/matroska.c
Michael Niedermayer f3356e9c9e more fine grained discarding of packets 
Originally committed as revision 4051 to svn://svn.ffmpeg.org/ffmpeg/trunk
2005-03-17 01:25:01 +00:00

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/*
* Matroska file demuxer (no muxer yet)
* Copyright (c) 2003-2004 The ffmpeg Project
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* @file matroska.c
* Matroska file demuxer
* by Ronald Bultje <rbultje@ronald.bitfreak.net>
* with a little help from Moritz Bunkus <moritz@bunkus.org>
* 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 "avi.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_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_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.
*/
#define MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC "V_MS/VFW/FOURCC"
#define MATROSKA_CODEC_ID_VIDEO_UNCOMPRESSED "V_UNCOMPRESSED"
#define MATROSKA_CODEC_ID_VIDEO_MPEG4_SP "V_MPEG4/ISO/SP"
#define MATROSKA_CODEC_ID_VIDEO_MPEG4_ASP "V_MPEG4/ISO/ASP"
#define MATROSKA_CODEC_ID_VIDEO_MPEG4_AP "V_MPEG4/ISO/AP"
#define MATROSKA_CODEC_ID_VIDEO_MPEG4_AVC "V_MPEG4/ISO/AVC"
#define MATROSKA_CODEC_ID_VIDEO_MSMPEG4V3 "V_MPEG4/MS/V3"
#define MATROSKA_CODEC_ID_VIDEO_MPEG1 "V_MPEG1"
#define MATROSKA_CODEC_ID_VIDEO_MPEG2 "V_MPEG2"
#define MATROSKA_CODEC_ID_VIDEO_MJPEG "V_MJPEG"
/* TODO: Real/Quicktime */
#define MATROSKA_CODEC_ID_AUDIO_ACM "A_MS/ACM"
#define MATROSKA_CODEC_ID_AUDIO_MPEG1_L1 "A_MPEG/L1"
#define MATROSKA_CODEC_ID_AUDIO_MPEG1_L2 "A_MPEG/L2"
#define MATROSKA_CODEC_ID_AUDIO_MPEG1_L3 "A_MPEG/L3"
#define MATROSKA_CODEC_ID_AUDIO_PCM_INT_BE "A_PCM/INT/BIG"
#define MATROSKA_CODEC_ID_AUDIO_PCM_INT_LE "A_PCM/INT/LIT"
#define MATROSKA_CODEC_ID_AUDIO_PCM_FLOAT "A_PCM/FLOAT/IEEE"
#define MATROSKA_CODEC_ID_AUDIO_AC3 "A_AC3"
#define MATROSKA_CODEC_ID_AUDIO_DTS "A_DTS"
#define MATROSKA_CODEC_ID_AUDIO_VORBIS "A_VORBIS"
#define MATROSKA_CODEC_ID_AUDIO_ACM "A_MS/ACM"
#define MATROSKA_CODEC_ID_AUDIO_MPEG2 "A_AAC/MPEG2/"
#define MATROSKA_CODEC_ID_AUDIO_MPEG4 "A_AAC/MPEG4/"
/* 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,
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;
/* length, position (time, ns) */
int64_t duration,
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. %llu (0x%llx)\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 %llu (0x%llx)\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 %lld (0x%llx)\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 %lld (0x%llx)\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 && size != 8 && size != 10) {
offset_t pos = url_ftell(pb);
av_log(matroska->ctx, AV_LOG_ERROR,
"Invalid float element size %d at position %llu (0x%llx)\n",
size, pos, pos);
return AVERROR_INVALIDDATA;
}
if (size == 10) {
av_log(matroska->ctx, AV_LOG_ERROR,
"FIXME! 10-byte floats unimplemented\n");
return AVERROR_UNKNOWN;
}
if (size == 4) {
float f;
while (size-- > 0)
#ifdef WORDS_BIGENDIAN
((uint8_t *) &f)[3 - size] = get_byte(pb);
#else
((uint8_t *) &f)[size] = get_byte(pb);
#endif
*num = f;
} else {
double d;
while (size-- > 0)
#ifdef WORDS_BIGENDIAN
((uint8_t *) &d)[7 - size] = get_byte(pb);
#else
((uint8_t *) &d)[size] = get_byte(pb);
#endif
*num = d;
}
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. %llu (0x%llx)\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. %llu (0x%llx)\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 (!total)
return AVERROR_INVALIDDATA;
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 %llu (> %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 %llu (> %d) 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 %llu (> %u) 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_free(matroska->packets);
matroska->packets = NULL;
}
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->duration = num * matroska->time_scale;
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->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: {
int64_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/%llu)\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)))
break;
if (id != seek_id) {
av_log(matroska->ctx, AV_LOG_INFO,
"We looked for ID=0x%x but got "
"ID=0x%x (pos=%llu)",
seek_id, id, seek_pos +
matroska->segment_start);
goto finish;
}
/* read master + parse */
if ((res = ebml_read_master(matroska, &id)) < 0)
break;
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;
}
if (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;
}
static int
matroska_read_header (AVFormatContext *s,
AVFormatParameters *ap)
{
MatroskaDemuxContext *matroska = s->priv_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;
}
}
if (res < 0)
return res;
/* Have we found a cluster? */
if (res == 1) {
int i;
enum CodecID codec_id;
MatroskaTrack *track;
AVStream *st;
void *extradata = NULL;
int extradata_size = 0;
for (i = 0; i < matroska->num_tracks; i++) {
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;
/* 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);
} else if (!strcmp(track->codec_id,
MATROSKA_CODEC_ID_VIDEO_MPEG4_SP) ||
!strcmp(track->codec_id,
MATROSKA_CODEC_ID_VIDEO_MPEG4_ASP) ||
!strcmp(track->codec_id,
MATROSKA_CODEC_ID_VIDEO_MPEG4_AP))
codec_id = CODEC_ID_MPEG4;
else if (!strcmp(track->codec_id,
MATROSKA_CODEC_ID_VIDEO_MPEG4_AVC))
codec_id = CODEC_ID_H264;
/* else if (!strcmp(track->codec_id, */
/* MATROSKA_CODEC_ID_VIDEO_UNCOMPRESSED)) */
/* codec_id = CODEC_ID_???; */
else if (!strcmp(track->codec_id,
MATROSKA_CODEC_ID_VIDEO_MSMPEG4V3))
codec_id = CODEC_ID_MSMPEG4V3;
else if (!strcmp(track->codec_id,
MATROSKA_CODEC_ID_VIDEO_MPEG1) ||
!strcmp(track->codec_id,
MATROSKA_CODEC_ID_VIDEO_MPEG2))
codec_id = CODEC_ID_MPEG2VIDEO;
/* 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 (!strcmp(track->codec_id,
MATROSKA_CODEC_ID_AUDIO_MPEG1_L1) ||
!strcmp(track->codec_id,
MATROSKA_CODEC_ID_AUDIO_MPEG1_L2) ||
!strcmp(track->codec_id,
MATROSKA_CODEC_ID_AUDIO_MPEG1_L3))
codec_id = CODEC_ID_MP3;
else if (!strcmp(track->codec_id,
MATROSKA_CODEC_ID_AUDIO_PCM_INT_BE))
codec_id = CODEC_ID_PCM_U16BE;
else if (!strcmp(track->codec_id,
MATROSKA_CODEC_ID_AUDIO_PCM_INT_LE))
codec_id = CODEC_ID_PCM_U16LE;
/* else if (!strcmp(track->codec_id, */
/* MATROSKA_CODEC_ID_AUDIO_PCM_FLOAT)) */
/* codec_id = CODEC_ID_PCM_???; */
else if (!strcmp(track->codec_id,
MATROSKA_CODEC_ID_AUDIO_AC3))
codec_id = CODEC_ID_AC3;
else if (!strcmp(track->codec_id,
MATROSKA_CODEC_ID_AUDIO_DTS))
codec_id = CODEC_ID_DTS;
/* No such codec id so far. */
/* else if (!strcmp(track->codec_id, */
/* MATROSKA_CODEC_ID_AUDIO_DTS)) */
/* codec_id = CODEC_ID_DTS; */
else if (!strcmp(track->codec_id,
MATROSKA_CODEC_ID_AUDIO_VORBIS)) {
unsigned char *p = track->codec_priv, *cdp;
int cps = track->codec_priv_size;
int nf, s[3], cds;
int i;
nf = *p++;
cps--;
if(nf != 2)
continue;
for(i = 0; i < 2; i++){
int xv;
s[i] = 0;
do {
xv = *p++;
s[i] += xv;
cps--;
} while(xv == 255);
}
s[2] = cps - s[0] - s[1];
cds = cps + 6;
extradata = cdp = av_malloc(cds);
if(extradata == NULL)
return AVERROR_NOMEM;
extradata_size = cds;
for(i = 0; i < 3; i++){
*cdp++ = s[i] >> 8;
*cdp++ = s[i] & 0xff;
memcpy(cdp, p, s[i]);
cdp += s[i];
p += s[i];
cps -= s[i];
}
codec_id = CODEC_ID_VORBIS;
} else if (!strcmp(track->codec_id,
MATROSKA_CODEC_ID_AUDIO_MPEG2) ||
!strcmp(track->codec_id,
MATROSKA_CODEC_ID_AUDIO_MPEG4))
codec_id = CODEC_ID_AAC;
else
codec_id = CODEC_ID_NONE;
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, 24, 1, 1000); /* 24 bit pts in ms */
st->codec.codec_id = codec_id;
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)
st->codec.sample_aspect_ratio.num =
videotrack->pixel_width;
else
st->codec.sample_aspect_ratio.num =
videotrack->display_width;
if (videotrack->display_height == 0)
st->codec.sample_aspect_ratio.num =
videotrack->pixel_height;
else
st->codec.sample_aspect_ratio.num =
videotrack->display_height;
} 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;
}
/* What do we do with private data? E.g. for Vorbis. */
}
}
return 0;
}
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;
int is_keyframe = PKT_FLAG_KEY, last_num_packets = matroska->num_packets;
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;
uint64_t time;
uint32_t *lace_size = NULL;
int n, track, flags, laces = 0;
uint64_t num;
if ((res = ebml_read_binary(matroska, &id, &data, &size)) < 0)
break;
origdata = data;
/* first byte(s): blocknum */
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;
}
/* time (relative to cluster time) */
time = ((data[0] << 8) | data[1]) * matroska->time_scale;
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 = 0;
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) {
if (time < 0 && (-time) > cluster_time)
timecode = cluster_time;
else
timecode = cluster_time + 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 / 1000000; /* ns to ms */
matroska_queue_packet(matroska, pkt);
}
}
av_free(lace_size);
av_free(origdata);
break;
}
case MATROSKA_ID_BLOCKDURATION: {
uint64_t num;
if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
break;
av_log(matroska->ctx, AV_LOG_INFO,
"FIXME: implement support for BlockDuration\n");
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;
}
}
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 %lld\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 * matroska->time_scale;
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;
if (matroska->writing_app)
av_free(matroska->writing_app);
if (matroska->muxing_app)
av_free(matroska->muxing_app);
if (matroska->index)
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];
if (track->codec_id)
av_free(track->codec_id);
if (track->codec_name)
av_free(track->codec_name);
if (track->codec_priv)
av_free(track->codec_priv);
if (track->name)
av_free(track->name);
if (track->language)
av_free(track->language);
av_free(track);
}
for (n = 0; n < s->nb_streams; n++) {
av_free(s->streams[n]->codec.extradata);
}
memset(matroska, 0, sizeof(MatroskaDemuxContext));
return 0;
}
static AVInputFormat matroska_iformat = {
"matroska",
"Matroska file format",
sizeof(MatroskaDemuxContext),
matroska_probe,
matroska_read_header,
matroska_read_packet,
matroska_read_close,
};
int
matroska_init(void)
{
av_register_input_format(&matroska_iformat);
return 0;
}
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