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9a9a3b03a6
ffmpeg/libavformat/matroskadec.c
Aurelien Jacobs 9a9a3b03a6 matroskadec: move declaration to upper block 
Originally committed as revision 14568 to svn://svn.ffmpeg.org/ffmpeg/trunk
2008-08-05 00:40:49 +00:00

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/*
* 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 matroskadec.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_id(). */
#include "riff.h"
#include "isom.h"
#include "matroska.h"
#include "libavcodec/mpeg4audio.h"
#include "libavutil/intfloat_readwrite.h"
#include "libavutil/avstring.h"
#include "libavutil/lzo.h"
#ifdef CONFIG_ZLIB
#include <zlib.h>
#endif
#ifdef CONFIG_BZLIB
#include <bzlib.h>
#endif
typedef enum {
EBML_NONE,
EBML_UINT,
EBML_FLOAT,
EBML_STR,
EBML_UTF8,
EBML_BIN,
EBML_NEST,
EBML_PASS,
EBML_STOP,
} EbmlType;
typedef const struct EbmlSyntax {
uint32_t id;
EbmlType type;
int list_elem_size;
int data_offset;
union {
uint64_t u;
double f;
const char *s;
const struct EbmlSyntax *n;
} def;
} EbmlSyntax;
typedef struct {
int nb_elem;
void *elem;
} EbmlList;
typedef struct {
int size;
uint8_t *data;
int64_t pos;
} EbmlBin;
typedef struct {
uint64_t version;
uint64_t max_size;
uint64_t id_length;
char *doctype;
uint64_t doctype_version;
} Ebml;
typedef struct {
uint64_t algo;
EbmlBin settings;
} MatroskaTrackCompression;
typedef struct {
uint64_t scope;
uint64_t type;
MatroskaTrackCompression compression;
} MatroskaTrackEncoding;
typedef struct {
double frame_rate;
uint64_t display_width;
uint64_t display_height;
uint64_t pixel_width;
uint64_t pixel_height;
uint64_t fourcc;
} MatroskaTrackVideo;
typedef struct {
double samplerate;
double out_samplerate;
uint64_t bitdepth;
uint64_t channels;
/* real audio header (extracted from extradata) */
int coded_framesize;
int sub_packet_h;
int frame_size;
int sub_packet_size;
int sub_packet_cnt;
int pkt_cnt;
uint8_t *buf;
} MatroskaTrackAudio;
typedef struct {
uint64_t num;
uint64_t type;
char *codec_id;
EbmlBin codec_priv;
char *language;
double time_scale;
uint64_t default_duration;
uint64_t flag_default;
MatroskaTrackVideo video;
MatroskaTrackAudio audio;
EbmlList encodings;
AVStream *stream;
} MatroskaTrack;
typedef struct {
char *filename;
char *mime;
EbmlBin bin;
} MatroskaAttachement;
typedef struct {
uint64_t start;
uint64_t end;
uint64_t uid;
char *title;
} MatroskaChapter;
typedef struct {
uint64_t track;
uint64_t pos;
} MatroskaIndexPos;
typedef struct {
uint64_t time;
EbmlList pos;
} MatroskaIndex;
typedef struct {
uint64_t id;
uint64_t pos;
} MatroskaSeekhead;
typedef struct MatroskaLevel {
uint64_t start;
uint64_t length;
} MatroskaLevel;
typedef struct MatroskaDemuxContext {
AVFormatContext *ctx;
/* ebml stuff */
int num_levels;
MatroskaLevel levels[EBML_MAX_DEPTH];
int level_up;
/* timescale in the file */
uint64_t time_scale;
double duration;
char *title;
EbmlList tracks;
EbmlList attachments;
EbmlList chapters;
EbmlList index;
EbmlList seekhead;
/* num_streams is the number of streams that av_new_stream() was called
* for ( = that are available to the calling program). */
int num_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;
int index_parsed;
int done;
/* What to skip before effectively reading a packet. */
int skip_to_keyframe;
AVStream *skip_to_stream;
} MatroskaDemuxContext;
#define ARRAY_SIZE(x) (sizeof(x)/sizeof(*x))
static EbmlSyntax ebml_header[] = {
{ EBML_ID_EBMLREADVERSION, EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
{ EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
{ EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
{ EBML_ID_DOCTYPE, EBML_STR, 0, offsetof(Ebml,doctype), {.s="(none)"} },
{ EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
{ EBML_ID_EBMLVERSION, EBML_NONE },
{ EBML_ID_DOCTYPEVERSION, EBML_NONE },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax ebml_syntax[] = {
{ EBML_ID_HEADER, EBML_NEST, 0, 0, {.n=ebml_header} },
{ 0 }
};
static EbmlSyntax matroska_info[] = {
{ MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, offsetof(MatroskaDemuxContext,time_scale), {.u=1000000} },
{ MATROSKA_ID_DURATION, EBML_FLOAT, 0, offsetof(MatroskaDemuxContext,duration) },
{ MATROSKA_ID_TITLE, EBML_UTF8, 0, offsetof(MatroskaDemuxContext,title) },
{ MATROSKA_ID_WRITINGAPP, EBML_NONE },
{ MATROSKA_ID_MUXINGAPP, EBML_NONE },
{ MATROSKA_ID_DATEUTC, EBML_NONE },
{ MATROSKA_ID_SEGMENTUID, EBML_NONE },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_track_video[] = {
{ MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT,0, offsetof(MatroskaTrackVideo,frame_rate) },
{ MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_width) },
{ MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_height) },
{ MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_width) },
{ MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_height) },
{ MATROSKA_ID_VIDEOCOLORSPACE, EBML_UINT, 0, offsetof(MatroskaTrackVideo,fourcc) },
{ MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
{ MATROSKA_ID_VIDEOSTEREOMODE, EBML_NONE },
{ MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_track_audio[] = {
{ MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
{ MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
{ MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
{ MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_track_encoding_compression[] = {
{ MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
{ MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_track_encoding[] = {
{ MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
{ MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
{ MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_track_encodings[] = {
{ MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_track[] = {
{ MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, offsetof(MatroskaTrack,num) },
{ MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, offsetof(MatroskaTrack,type) },
{ MATROSKA_ID_CODECID, EBML_STR, 0, offsetof(MatroskaTrack,codec_id) },
{ MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, offsetof(MatroskaTrack,codec_priv) },
{ MATROSKA_ID_TRACKLANGUAGE, EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
{ MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
{ MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
{ MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
{ MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
{ MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
{ MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
{ MATROSKA_ID_TRACKUID, EBML_NONE },
{ MATROSKA_ID_TRACKNAME, EBML_NONE },
{ MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE },
{ MATROSKA_ID_TRACKFLAGFORCED, EBML_NONE },
{ MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
{ MATROSKA_ID_CODECNAME, EBML_NONE },
{ MATROSKA_ID_CODECDECODEALL, EBML_NONE },
{ MATROSKA_ID_CODECINFOURL, EBML_NONE },
{ MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
{ MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
{ MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_tracks[] = {
{ MATROSKA_ID_TRACKENTRY, EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_attachment[] = {
{ MATROSKA_ID_FILENAME, EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
{ MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, offsetof(MatroskaAttachement,mime) },
{ MATROSKA_ID_FILEDATA, EBML_BIN, 0, offsetof(MatroskaAttachement,bin) },
{ MATROSKA_ID_FILEUID, EBML_NONE },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_attachments[] = {
{ MATROSKA_ID_ATTACHEDFILE, EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_chapter_display[] = {
{ MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_chapter_entry[] = {
{ MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
{ MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
{ MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
{ MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
{ MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_chapter[] = {
{ MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
{ MATROSKA_ID_EDITIONUID, EBML_NONE },
{ MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
{ MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_chapters[] = {
{ MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, {.n=matroska_chapter} },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_index_pos[] = {
{ MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
{ MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos) },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_index_entry[] = {
{ MATROSKA_ID_CUETIME, EBML_UINT, 0, offsetof(MatroskaIndex,time) },
{ MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_index[] = {
{ MATROSKA_ID_POINTENTRY, EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_tags[] = {
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_seekhead_entry[] = {
{ MATROSKA_ID_SEEKID, EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
{ MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_seekhead[] = {
{ MATROSKA_ID_SEEKENTRY, EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
/*
* 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(EIO); /* 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;
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;
}
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(ENOMEM);
}
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);
av_free(*str);
return AVERROR(EIO);
}
(*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, 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(ENOSYS);
}
/* 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(ENOMEM);
}
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(EIO);
}
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;
}
static MatroskaTrack *
matroska_find_track_by_num (MatroskaDemuxContext *matroska,
int num)
{
MatroskaTrack *tracks = matroska->tracks.elem;
int i;
for (i=0; i < matroska->tracks.nb_elem; i++)
if (tracks[i].num == num)
return &tracks[i];
av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
return NULL;
}
/*
* 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++;
}
/*
* Free all packets in our internal queue.
*/
static void
matroska_clear_queue (MatroskaDemuxContext *matroska)
{
if (matroska->packets) {
int n;
for (n = 0; n < matroska->num_packets; n++) {
av_free_packet(matroska->packets[n]);
av_free(matroska->packets[n]);
}
av_free(matroska->packets);
matroska->packets = NULL;
matroska->num_packets = 0;
}
}
/*
* 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' };
/* ebml header? */
if (AV_RB32(p->buf) != EBML_ID_HEADER)
return 0;
/* length of header */
total = p->buf[4];
while (size <= 8 && !(total & len_mask)) {
size++;
len_mask >>= 1;
}
if (size > 8)
return 0;
total &= (len_mask - 1);
while (n < size)
total = (total << 8) | p->buf[4 + n++];
/* does the probe data contain the whole header? */
if (p->buf_size < 4 + size + total)
return 0;
/* the header 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 ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
void *data, uint32_t expected_id, int once);
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
EbmlSyntax *syntax, void *data)
{
uint32_t id = syntax->id;
EbmlBin *bin;
int res;
data = (char *)data + syntax->data_offset;
if (syntax->list_elem_size) {
EbmlList *list = data;
list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
memset(data, 0, syntax->list_elem_size);
list->nb_elem++;
}
bin = data;
switch (syntax->type) {
case EBML_UINT: return ebml_read_uint (matroska, &id, data);
case EBML_FLOAT: return ebml_read_float(matroska, &id, data);
case EBML_STR:
case EBML_UTF8: av_free(*(char **)data);
return ebml_read_ascii(matroska, &id, data);
case EBML_BIN: av_free(bin->data);
bin->pos = url_ftell(matroska->ctx->pb);
return ebml_read_binary(matroska, &id, &bin->data,
&bin->size);
case EBML_NEST: if ((res=ebml_read_master(matroska, &id)) < 0)
return res;
if (id == MATROSKA_ID_SEGMENT)
matroska->segment_start = url_ftell(matroska->ctx->pb);
return ebml_parse(matroska, syntax->def.n, data, 0, 0);
case EBML_PASS: return ebml_parse(matroska, syntax->def.n, data, 0, 1);
case EBML_STOP: *(int *)data = 1; return 1;
default: return ebml_read_skip(matroska);
}
}
static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
uint32_t id, void *data)
{
int i;
for (i=0; syntax[i].id; i++)
if (id == syntax[i].id)
break;
if (!syntax[i].id)
av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
return ebml_parse_elem(matroska, &syntax[i], data);
}
static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
void *data, uint32_t expected_id, int once)
{
int i, res = 0;
uint32_t id = 0;
for (i=0; syntax[i].id; i++)
switch (syntax[i].type) {
case EBML_UINT:
*(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
break;
case EBML_FLOAT:
*(double *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
break;
case EBML_STR:
case EBML_UTF8:
*(char **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
break;
}
if (expected_id) {
res = ebml_read_master(matroska, &id);
if (id != expected_id)
return AVERROR_INVALIDDATA;
if (id == MATROSKA_ID_SEGMENT)
matroska->segment_start = url_ftell(matroska->ctx->pb);
}
while (!res) {
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
res = AVERROR(EIO);
break;
} else if (matroska->level_up) {
matroska->level_up--;
break;
}
res = ebml_parse_id(matroska, syntax, id, data);
if (once)
break;
if (matroska->level_up) {
matroska->level_up--;
break;
}
}
return res;
}
static void ebml_free(EbmlSyntax *syntax, void *data)
{
int i, j;
for (i=0; syntax[i].id; i++) {
void *data_off = (char *)data + syntax[i].data_offset;
switch (syntax[i].type) {
case EBML_STR:
case EBML_UTF8: av_freep(data_off); break;
case EBML_BIN: av_freep(&((EbmlBin *)data_off)->data); break;
case EBML_NEST:
if (syntax[i].list_elem_size) {
EbmlList *list = data_off;
char *ptr = list->elem;
for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
ebml_free(syntax[i].def.n, ptr);
av_free(list->elem);
} else
ebml_free(syntax[i].def.n, data_off);
default: break;
}
}
}
static int
matroska_parse_info (MatroskaDemuxContext *matroska)
{
int res = ebml_parse(matroska, matroska_info, matroska, MATROSKA_ID_INFO, 0);
if (matroska->duration)
matroska->ctx->duration = matroska->duration * matroska->time_scale
* 1000 / AV_TIME_BASE;
if (matroska->title)
strncpy(matroska->ctx->title, matroska->title,
sizeof(matroska->ctx->title)-1);
return res;
}
static int
matroska_decode_buffer(uint8_t** buf, int* buf_size, MatroskaTrack *track)
{
MatroskaTrackEncoding *encodings = track->encodings.elem;
uint8_t* data = *buf;
int isize = *buf_size;
uint8_t* pkt_data = NULL;
int pkt_size = isize;
int result = 0;
int olen;
switch (encodings[0].compression.algo) {
case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
return encodings[0].compression.settings.size;
case MATROSKA_TRACK_ENCODING_COMP_LZO:
do {
olen = pkt_size *= 3;
pkt_data = av_realloc(pkt_data,
pkt_size+LZO_OUTPUT_PADDING);
result = lzo1x_decode(pkt_data, &olen, data, &isize);
} while (result==LZO_OUTPUT_FULL && pkt_size<10000000);
if (result)
goto failed;
pkt_size -= olen;
break;
#ifdef CONFIG_ZLIB
case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
z_stream zstream = {0};
if (inflateInit(&zstream) != Z_OK)
return -1;
zstream.next_in = data;
zstream.avail_in = isize;
do {
pkt_size *= 3;
pkt_data = av_realloc(pkt_data, pkt_size);
zstream.avail_out = pkt_size - zstream.total_out;
zstream.next_out = pkt_data + zstream.total_out;
result = inflate(&zstream, Z_NO_FLUSH);
} while (result==Z_OK && pkt_size<10000000);
pkt_size = zstream.total_out;
inflateEnd(&zstream);
if (result != Z_STREAM_END)
goto failed;
break;
}
#endif
#ifdef CONFIG_BZLIB
case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
bz_stream bzstream = {0};
if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
return -1;
bzstream.next_in = data;
bzstream.avail_in = isize;
do {
pkt_size *= 3;
pkt_data = av_realloc(pkt_data, pkt_size);
bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
bzstream.next_out = pkt_data + bzstream.total_out_lo32;
result = BZ2_bzDecompress(&bzstream);
} while (result==BZ_OK && pkt_size<10000000);
pkt_size = bzstream.total_out_lo32;
BZ2_bzDecompressEnd(&bzstream);
if (result != BZ_STREAM_END)
goto failed;
break;
}
#endif
}
*buf = pkt_data;
*buf_size = pkt_size;
return 0;
failed:
av_free(pkt_data);
return -1;
}
static int
matroska_parse_tracks (MatroskaDemuxContext *matroska)
{
MatroskaTrack *tracks;
int i, res;
res = ebml_parse(matroska, matroska_tracks, matroska, MATROSKA_ID_TRACKS, 0);
tracks = matroska->tracks.elem;
for (i=0; i<matroska->tracks.nb_elem; i++) {
MatroskaTrack *track = &tracks[i];
EbmlList *encodings_list = &tracks->encodings;
MatroskaTrackEncoding *encodings = encodings_list->elem;
if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
track->type != MATROSKA_TRACK_TYPE_AUDIO &&
track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
av_log(matroska->ctx, AV_LOG_INFO,
"Unknown or unsupported track type %"PRIu64"\n",
track->type);
continue;
}
if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
if (!track->default_duration)
track->default_duration = 1000000000/track->video.frame_rate;
if (!track->video.display_width)
track->video.display_width = track->video.pixel_width;
if (!track->video.display_height)
track->video.display_height = track->video.pixel_height;
} else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
if (!track->audio.out_samplerate)
track->audio.out_samplerate = track->audio.samplerate;
}
if (encodings_list->nb_elem > 1) {
av_log(matroska->ctx, AV_LOG_ERROR,
"Multiple combined encodings no supported");
} else if (encodings_list->nb_elem == 1) {
if (encodings[0].type ||
(encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
#ifdef CONFIG_ZLIB
encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
#endif
#ifdef CONFIG_BZLIB
encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
#endif
encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
encodings[0].scope = 0;
av_log(matroska->ctx, AV_LOG_ERROR,
"Unsupported encoding type");
} else if (track->codec_priv.size && encodings[0].scope&2) {
uint8_t *codec_priv = track->codec_priv.data;
int offset = matroska_decode_buffer(&track->codec_priv.data,
&track->codec_priv.size,
track);
if (offset < 0) {
track->codec_priv.data = NULL;
track->codec_priv.size = 0;
av_log(matroska->ctx, AV_LOG_ERROR,
"Failed to decode codec private data\n");
} else if (offset > 0) {
track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
memcpy(track->codec_priv.data,
encodings[0].compression.settings.data, offset);
memcpy(track->codec_priv.data+offset, codec_priv,
track->codec_priv.size);
track->codec_priv.size += offset;
}
if (codec_priv != track->codec_priv.data)
av_free(codec_priv);
}
}
}
return res;
}
static int
matroska_parse_index (MatroskaDemuxContext *matroska)
{
return ebml_parse(matroska, matroska_index, matroska, MATROSKA_ID_CUES, 0);
}
static int
matroska_parse_metadata (MatroskaDemuxContext *matroska)
{
return ebml_parse(matroska, matroska_tags, matroska, MATROSKA_ID_TAGS, 0);
}
static int
matroska_parse_seekhead (MatroskaDemuxContext *matroska)
{
return ebml_parse(matroska, matroska_seekhead, matroska, MATROSKA_ID_SEEKHEAD, 0);
}
static void
matroska_execute_seekhead(MatroskaDemuxContext *matroska)
{
EbmlList *seekhead_list = &matroska->seekhead;
MatroskaSeekhead *seekhead = seekhead_list->elem;
uint32_t peek_id_cache = matroska->peek_id;
uint32_t level_up = matroska->level_up;
offset_t before_pos = url_ftell(matroska->ctx->pb);
MatroskaLevel level;
uint32_t id;
int i, res;
for (i=0; i<seekhead_list->nb_elem; i++) {
if (seekhead[i].pos <= before_pos
|| seekhead[i].id == MATROSKA_ID_SEEKHEAD
|| seekhead[i].id == MATROSKA_ID_CLUSTER)
continue;
/* seek */
if (ebml_read_seek(matroska,
seekhead[i].pos+matroska->segment_start) < 0)
continue;
/* 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);
break;
}
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 != seekhead[i].id) {
av_log(matroska->ctx, AV_LOG_INFO,
"We looked for ID=0x%x but got "
"ID=0x%x (pos=%"PRIu64")",
(int)seekhead[i].id, id, seekhead[i].pos +
matroska->segment_start);
goto finish;
}
/* read master + parse */
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) {
uint64_t length = matroska->levels[--matroska->num_levels].length;
if (length == (uint64_t)-1)
break;
}
}
/* seek back */
ebml_read_seek(matroska, before_pos);
matroska->peek_id = peek_id_cache;
matroska->level_up = level_up;
}
static int
matroska_parse_attachments(AVFormatContext *s)
{
MatroskaDemuxContext *matroska = s->priv_data;
EbmlList *attachements_list = &matroska->attachments;
MatroskaAttachement *attachements;
int i, j, res;
res = ebml_parse(matroska, matroska_attachments, matroska, MATROSKA_ID_ATTACHMENTS, 0);
attachements = attachements_list->elem;
for (j=0; j<attachements_list->nb_elem; j++) {
if (!(attachements[j].filename && attachements[j].mime &&
attachements[j].bin.data && attachements[j].bin.size > 0)) {
av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
} else {
AVStream *st = av_new_stream(s, matroska->num_streams++);
if (st == NULL)
break;
st->filename = av_strdup(attachements[j].filename);
st->codec->codec_id = CODEC_ID_NONE;
st->codec->codec_type = CODEC_TYPE_ATTACHMENT;
st->codec->extradata = av_malloc(attachements[j].bin.size);
if(st->codec->extradata == NULL)
break;
st->codec->extradata_size = attachements[j].bin.size;
memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
strlen(ff_mkv_mime_tags[i].str))) {
st->codec->codec_id = ff_mkv_mime_tags[i].id;
break;
}
}
}
}
return res;
}
static int
matroska_parse_chapters(AVFormatContext *s)
{
MatroskaDemuxContext *matroska = s->priv_data;
EbmlList *chapters_list = &matroska->chapters;
MatroskaChapter *chapters;
int i, res;
res = ebml_parse(matroska, matroska_chapters, matroska, MATROSKA_ID_CHAPTERS, 0);
chapters = chapters_list->elem;
for (i=0; i<chapters_list->nb_elem; i++)
if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid)
ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
chapters[i].start, chapters[i].end,
chapters[i].title);
return res;
}
static int
matroska_aac_profile (char *codec_id)
{
static const char *aac_profiles[] = {
"MAIN", "LC", "SSR"
};
int profile;
for (profile=0; profile<ARRAY_SIZE(aac_profiles); profile++)
if (strstr(codec_id, aac_profiles[profile]))
break;
return profile + 1;
}
static int
matroska_aac_sri (int samplerate)
{
int sri;
for (sri=0; sri<ARRAY_SIZE(ff_mpeg4audio_sample_rates); sri++)
if (ff_mpeg4audio_sample_rates[sri] == samplerate)
break;
return sri;
}
static int
matroska_read_header (AVFormatContext *s,
AVFormatParameters *ap)
{
MatroskaDemuxContext *matroska = s->priv_data;
MatroskaTrack *tracks;
EbmlList *index_list;
MatroskaIndex *index;
int i, j, last_level, res = 0;
Ebml ebml = { 0 };
AVStream *st;
uint32_t id;
matroska->ctx = s;
/* First read the EBML header. */
if (ebml_parse(matroska, ebml_syntax, &ebml, 0, 1)
|| ebml.version > EBML_VERSION || ebml.max_size > sizeof(uint64_t)
|| ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
|| ebml.doctype_version > 2) {
av_log(matroska->ctx, AV_LOG_ERROR,
"EBML header using unsupported features\n"
"(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
ebml.version, ebml.doctype, ebml.doctype_version);
return AVERROR_NOFMT;
}
ebml_free(ebml_syntax, &ebml);
/* The next thing is a segment. */
while (1) {
if (!(id = ebml_peek_id(matroska, &last_level)))
return AVERROR(EIO);
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(EIO);
break;
} else if (matroska->level_up) {
matroska->level_up--;
break;
}
switch (id) {
/* stream info */
case MATROSKA_ID_INFO: {
res = matroska_parse_info(matroska);
break;
}
/* track info headers */
case MATROSKA_ID_TRACKS: {
res = matroska_parse_tracks(matroska);
break;
}
/* stream index */
case MATROSKA_ID_CUES: {
if (!matroska->index_parsed) {
res = matroska_parse_index(matroska);
} else
res = ebml_read_skip(matroska);
break;
}
/* metadata */
case MATROSKA_ID_TAGS: {
if (!matroska->metadata_parsed) {
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: {
res = matroska_parse_seekhead(matroska);
break;
}
case MATROSKA_ID_ATTACHMENTS: {
res = matroska_parse_attachments(s);
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;
}
case MATROSKA_ID_CHAPTERS: {
res = matroska_parse_chapters(s);
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;
}
}
matroska_execute_seekhead(matroska);
/* Have we found a cluster? */
if (ebml_peek_id(matroska, NULL) != MATROSKA_ID_CLUSTER)
return -1;
{
tracks = matroska->tracks.elem;
for (i=0; i < matroska->tracks.nb_elem; i++) {
MatroskaTrack *track = &tracks[i];
enum CodecID codec_id = CODEC_ID_NONE;
uint8_t *extradata = NULL;
int extradata_size = 0;
int extradata_offset = 0;
/* Apply some sanity checks. */
if (track->codec_id == NULL)
continue;
for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
strlen(ff_mkv_codec_tags[j].str))){
codec_id= ff_mkv_codec_tags[j].id;
break;
}
}
st = track->stream = av_new_stream(s, matroska->num_streams++);
if (st == NULL)
return AVERROR(ENOMEM);
/* 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.data != NULL)) {
/* Offset of biCompression. Stored in LE. */
track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
codec_id = codec_get_id(codec_bmp_tags, track->video.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.data != NULL)) {
/* Offset of wFormatTag. Stored in LE. */
uint16_t tag = AV_RL16(track->codec_priv.data);
codec_id = codec_get_id(codec_wav_tags, tag);
}
if (!strcmp(track->codec_id, "V_QUICKTIME") &&
(track->codec_priv.size >= 86) &&
(track->codec_priv.data != NULL)) {
track->video.fourcc = AV_RL32(track->codec_priv.data);
codec_id=codec_get_id(codec_movvideo_tags, track->video.fourcc);
}
else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
int profile = matroska_aac_profile(track->codec_id);
int sri = matroska_aac_sri(track->audio.samplerate);
extradata = av_malloc(5);
if (extradata == NULL)
return AVERROR(ENOMEM);
extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
if (strstr(track->codec_id, "SBR")) {
sri = matroska_aac_sri(track->audio.out_samplerate);
extradata[2] = 0x56;
extradata[3] = 0xE5;
extradata[4] = 0x80 | (sri<<3);
extradata_size = 5;
} else {
extradata_size = 2;
}
}
else if (codec_id == CODEC_ID_TTA) {
ByteIOContext b;
extradata_size = 30;
extradata = av_mallocz(extradata_size);
if (extradata == NULL)
return AVERROR(ENOMEM);
init_put_byte(&b, extradata, extradata_size, 1,
NULL, NULL, NULL, NULL);
put_buffer(&b, "TTA1", 4);
put_le16(&b, 1);
put_le16(&b, track->audio.channels);
put_le16(&b, track->audio.bitdepth);
put_le32(&b, track->audio.out_samplerate);
put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
}
else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
extradata_offset = 26;
track->codec_priv.size -= extradata_offset;
}
else if (codec_id == CODEC_ID_RA_144) {
track->audio.out_samplerate = 8000;
track->audio.channels = 1;
}
else if (codec_id == CODEC_ID_RA_288 ||
codec_id == CODEC_ID_COOK ||
codec_id == CODEC_ID_ATRAC3) {
ByteIOContext b;
init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
0, NULL, NULL, NULL, NULL);
url_fskip(&b, 24);
track->audio.coded_framesize = get_be32(&b);
url_fskip(&b, 12);
track->audio.sub_packet_h = get_be16(&b);
track->audio.frame_size = get_be16(&b);
track->audio.sub_packet_size = get_be16(&b);
track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
if (codec_id == CODEC_ID_RA_288) {
st->codec->block_align = track->audio.coded_framesize;
track->codec_priv.size = 0;
} else {
st->codec->block_align = track->audio.sub_packet_size;
extradata_offset = 78;
track->codec_priv.size -= extradata_offset;
}
}
if (codec_id == CODEC_ID_NONE) {
av_log(matroska->ctx, AV_LOG_INFO,
"Unknown/unsupported CodecID %s.\n",
track->codec_id);
}
av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
st->codec->codec_id = codec_id;
st->start_time = 0;
if (strcmp(track->language, "und"))
av_strlcpy(st->language, track->language, 4);
if (track->flag_default)
st->disposition |= AV_DISPOSITION_DEFAULT;
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.data && track->codec_priv.size > 0){
st->codec->extradata = av_malloc(track->codec_priv.size);
if(st->codec->extradata == NULL)
return AVERROR(ENOMEM);
st->codec->extradata_size = track->codec_priv.size;
memcpy(st->codec->extradata,
track->codec_priv.data + extradata_offset,
track->codec_priv.size);
}
if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
st->codec->codec_type = CODEC_TYPE_VIDEO;
st->codec->codec_tag = track->video.fourcc;
st->codec->width = track->video.pixel_width;
st->codec->height = track->video.pixel_height;
av_reduce(&st->codec->sample_aspect_ratio.num,
&st->codec->sample_aspect_ratio.den,
st->codec->height * track->video.display_width,
st->codec-> width * track->video.display_height,
255);
st->need_parsing = AVSTREAM_PARSE_HEADERS;
} else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->sample_rate = track->audio.out_samplerate;
st->codec->channels = track->audio.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;
}
index_list = &matroska->index;
index = index_list->elem;
for (i=0; i<index_list->nb_elem; i++) {
EbmlList *pos_list = &index[i].pos;
MatroskaIndexPos *pos = pos_list->elem;
for (j=0; j<pos_list->nb_elem; j++) {
MatroskaTrack *track = matroska_find_track_by_num(matroska,
pos[j].track);
if (track && track->stream)
av_add_index_entry(track->stream,
pos[j].pos + matroska->segment_start,
index[i].time*matroska->time_scale/AV_TIME_BASE,
0, 0, AVINDEX_KEYFRAME);
}
}
return res;
}
static int
matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data, int size,
int64_t pos, uint64_t cluster_time, uint64_t duration,
int is_keyframe)
{
MatroskaTrack *track;
int res = 0;
AVStream *st;
AVPacket *pkt;
uint8_t *origdata = data;
int16_t block_time;
uint32_t *lace_size = NULL;
int n, flags, laces = 0;
uint64_t num;
/* 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);
return res;
}
data += n;
size -= n;
/* fetch track from num */
track = matroska_find_track_by_num(matroska, num);
if (size <= 3 || !track || !track->stream) {
av_log(matroska->ctx, AV_LOG_INFO,
"Invalid stream %"PRIu64" or size %u\n", num, size);
av_free(origdata);
return res;
}
st = track->stream;
if (st->discard >= AVDISCARD_ALL) {
av_free(origdata);
return res;
}
if (duration == AV_NOPTS_VALUE)
duration = track->default_duration / matroska->time_scale;
/* block_time (relative to cluster time) */
block_time = AV_RB16(data);
data += 2;
flags = *data++;
size -= 3;
if (is_keyframe == -1)
is_keyframe = flags & 0x80 ? PKT_FLAG_KEY : 0;
if (matroska->skip_to_keyframe) {
if (!is_keyframe || st != matroska->skip_to_stream) {
av_free(origdata);
return res;
}
matroska->skip_to_keyframe = 0;
}
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 */
assert(size>0); // size <=3 is checked before size-=3 above
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) {
uint64_t timecode = AV_NOPTS_VALUE;
if (cluster_time != (uint64_t)-1
&& (block_time >= 0 || cluster_time >= -block_time))
timecode = cluster_time + block_time;
for (n = 0; n < laces; n++) {
if (st->codec->codec_id == CODEC_ID_RA_288 ||
st->codec->codec_id == CODEC_ID_COOK ||
st->codec->codec_id == CODEC_ID_ATRAC3) {
int a = st->codec->block_align;
int sps = track->audio.sub_packet_size;
int cfs = track->audio.coded_framesize;
int h = track->audio.sub_packet_h;
int y = track->audio.sub_packet_cnt;
int w = track->audio.frame_size;
int x;
if (!track->audio.pkt_cnt) {
if (st->codec->codec_id == CODEC_ID_RA_288)
for (x=0; x<h/2; x++)
memcpy(track->audio.buf+x*2*w+y*cfs,
data+x*cfs, cfs);
else
for (x=0; x<w/sps; x++)
memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
if (++track->audio.sub_packet_cnt >= h) {
track->audio.sub_packet_cnt = 0;
track->audio.pkt_cnt = h*w / a;
}
}
while (track->audio.pkt_cnt) {
pkt = av_mallocz(sizeof(AVPacket));
av_new_packet(pkt, a);
memcpy(pkt->data, track->audio.buf
+ a * (h*w / a - track->audio.pkt_cnt--), a);
pkt->pos = pos;
pkt->stream_index = st->index;
matroska_queue_packet(matroska, pkt);
}
} else {
MatroskaTrackEncoding *encodings = track->encodings.elem;
int offset = 0, pkt_size = lace_size[n];
uint8_t *pkt_data = data;
if (encodings && encodings->scope & 1) {
offset = matroska_decode_buffer(&pkt_data, &pkt_size,
track);
if (offset < 0)
continue;
}
pkt = av_mallocz(sizeof(AVPacket));
/* XXX: prevent data copy... */
if (av_new_packet(pkt, pkt_size+offset) < 0) {
av_free(pkt);
res = AVERROR(ENOMEM);
n = laces-1;
break;
}
if (offset)
memcpy (pkt->data, encodings->compression.settings.data, offset);
memcpy (pkt->data+offset, pkt_data, pkt_size);
if (pkt_data != data)
av_free(pkt_data);
if (n == 0)
pkt->flags = is_keyframe;
pkt->stream_index = st->index;
pkt->pts = timecode;
pkt->pos = pos;
pkt->duration = duration;
matroska_queue_packet(matroska, pkt);
}
if (timecode != AV_NOPTS_VALUE)
timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
data += lace_size[n];
}
}
av_free(lace_size);
av_free(origdata);
return res;
}
static int
matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
uint64_t cluster_time)
{
int res = 0;
uint32_t id;
int is_keyframe = PKT_FLAG_KEY, last_num_packets = matroska->num_packets;
uint64_t duration = AV_NOPTS_VALUE;
uint8_t *data;
int size = 0;
int64_t pos = 0;
av_log(matroska->ctx, AV_LOG_DEBUG, "parsing blockgroup...\n");
while (res == 0) {
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
res = AVERROR(EIO);
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: {
pos = url_ftell(matroska->ctx->pb);
res = ebml_read_binary(matroska, &id, &data, &size);
break;
}
case MATROSKA_ID_BLOCKDURATION: {
if ((res = ebml_read_uint(matroska, &id, &duration)) < 0)
break;
break;
}
case MATROSKA_ID_BLOCKREFERENCE: {
int64_t num;
/* 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;
if ((res = ebml_read_sint(matroska, &id, &num)) < 0)
break;
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 (res)
return res;
if (size > 0)
res = matroska_parse_block(matroska, data, size, pos, cluster_time,
duration, is_keyframe);
return res;
}
static int
matroska_parse_cluster (MatroskaDemuxContext *matroska)
{
int res = 0;
uint32_t id;
uint64_t cluster_time = 0;
uint8_t *data;
int64_t pos;
int size;
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(EIO);
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;
case MATROSKA_ID_SIMPLEBLOCK:
pos = url_ftell(matroska->ctx->pb);
res = ebml_read_binary(matroska, &id, &data, &size);
if (res == 0)
res = matroska_parse_block(matroska, data, size, pos,
cluster_time, AV_NOPTS_VALUE,
-1);
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;
uint32_t id;
/* Read stream until we have a packet queued. */
while (matroska_deliver_packet(matroska, pkt)) {
/* Have we already reached the end? */
if (matroska->done)
return AVERROR(EIO);
res = 0;
while (res == 0) {
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
return AVERROR(EIO);
} 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 0;
}
static int
matroska_read_seek (AVFormatContext *s, int stream_index, int64_t timestamp,
int flags)
{
MatroskaDemuxContext *matroska = s->priv_data;
AVStream *st = s->streams[stream_index];
int index;
/* find index entry */
index = av_index_search_timestamp(st, timestamp, flags);
if (index < 0)
return 0;
matroska_clear_queue(matroska);
/* do the seek */
url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
matroska->skip_to_stream = st;
matroska->peek_id = 0;
av_update_cur_dts(s, st, st->index_entries[index].timestamp);
return 0;
}
static int
matroska_read_close (AVFormatContext *s)
{
MatroskaDemuxContext *matroska = s->priv_data;
MatroskaTrack *tracks = matroska->tracks.elem;
int n = 0;
matroska_clear_queue(matroska);
for (n=0; n < matroska->tracks.nb_elem; n++)
if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
av_free(tracks[n].audio.buf);
ebml_free(matroska_tracks, matroska);
ebml_free(matroska_index, matroska);
return 0;
}
AVInputFormat matroska_demuxer = {
"matroska",
NULL_IF_CONFIG_SMALL("Matroska file format"),
sizeof(MatroskaDemuxContext),
matroska_probe,
matroska_read_header,
matroska_read_packet,
matroska_read_close,
matroska_read_seek,
};
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