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/*
* Matroska file demuxer
* Copyright (c) 2003-2008 The FFmpeg Project
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Matroska file demuxer
* @author Ronald Bultje <rbultje@ronald.bitfreak.net>
* @author with a little help from Moritz Bunkus <moritz@bunkus.org>
* @author totally reworked by Aurelien Jacobs <aurel@gnuage.org>
* @see specs available on the Matroska project page: http://www.matroska.org/
*/
#include "config.h"
#include <inttypes.h>
#include <stdio.h>
#include "libavutil/avstring.h"
#include "libavutil/base64.h"
#include "libavutil/bprint.h"
#include "libavutil/dict.h"
#include "libavutil/intfloat.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/lzo.h"
#include "libavutil/mastering_display_metadata.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/time_internal.h"
#include "libavutil/spherical.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/flac.h"
#include "libavcodec/mpeg4audio.h"
#include "libavcodec/packet_internal.h"
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#include "isom.h"
#include "matroska.h"
#include "oggdec.h"
/* For ff_codec_get_id(). */
#include "riff.h"
#include "rmsipr.h"
#if CONFIG_BZLIB
#include <bzlib.h>
#endif
#if CONFIG_ZLIB
#include <zlib.h>
#endif
#include "qtpalette.h"
#define EBML_UNKNOWN_LENGTH UINT64_MAX /* EBML unknown length, in uint64_t */
#define NEEDS_CHECKING 2 /* Indicates that some error checks
* still need to be performed */
#define LEVEL_ENDED 3 /* return value of ebml_parse when the
* syntax level used for parsing ended. */
#define SKIP_THRESHOLD 1024 * 1024 /* In non-seekable mode, if more than SKIP_THRESHOLD
* of unkown, potentially damaged data is encountered,
* it is considered an error. */
#define UNKNOWN_EQUIV 50 * 1024 /* An unknown element is considered equivalent
* to this many bytes of unknown data for the
* SKIP_THRESHOLD check. */
typedef enum {
EBML_NONE,
EBML_UINT,
EBML_SINT,
EBML_FLOAT,
EBML_STR,
EBML_UTF8,
EBML_BIN,
EBML_NEST,
EBML_LEVEL1,
EBML_STOP,
EBML_TYPE_COUNT
} EbmlType;
typedef struct CountedElement {
union {
uint64_t u;
int64_t i;
double f;
char *s;
} el;
unsigned count;
} CountedElement;
typedef const struct EbmlSyntax {
uint32_t id;
uint8_t type;
uint8_t is_counted;
size_t list_elem_size;
size_t data_offset;
union {
int64_t i;
uint64_t u;
double f;
const char *s;
const struct EbmlSyntax *n;
} def;
} EbmlSyntax;
typedef struct EbmlList {
int nb_elem;
unsigned int alloc_elem_size;
void *elem;
} EbmlList;
typedef struct EbmlBin {
int size;
AVBufferRef *buf;
uint8_t *data;
int64_t pos;
} EbmlBin;
typedef struct Ebml {
uint64_t version;
uint64_t max_size;
uint64_t id_length;
char *doctype;
uint64_t doctype_version;
} Ebml;
typedef struct MatroskaTrackCompression {
uint64_t algo;
EbmlBin settings;
} MatroskaTrackCompression;
typedef struct MatroskaTrackEncryption {
uint64_t algo;
EbmlBin key_id;
} MatroskaTrackEncryption;
typedef struct MatroskaTrackEncoding {
uint64_t scope;
uint64_t type;
MatroskaTrackCompression compression;
MatroskaTrackEncryption encryption;
} MatroskaTrackEncoding;
typedef struct MatroskaMasteringMeta {
double r_x;
double r_y;
double g_x;
double g_y;
double b_x;
double b_y;
double white_x;
double white_y;
double max_luminance;
CountedElement min_luminance;
} MatroskaMasteringMeta;
typedef struct MatroskaTrackVideoColor {
uint64_t matrix_coefficients;
uint64_t bits_per_channel;
uint64_t chroma_sub_horz;
uint64_t chroma_sub_vert;
uint64_t cb_sub_horz;
uint64_t cb_sub_vert;
uint64_t chroma_siting_horz;
uint64_t chroma_siting_vert;
uint64_t range;
uint64_t transfer_characteristics;
uint64_t primaries;
uint64_t max_cll;
uint64_t max_fall;
MatroskaMasteringMeta mastering_meta;
} MatroskaTrackVideoColor;
typedef struct MatroskaTrackVideoProjection {
uint64_t type;
EbmlBin private;
double yaw;
double pitch;
double roll;
} MatroskaTrackVideoProjection;
typedef struct MatroskaTrackVideo {
double frame_rate;
uint64_t display_width;
uint64_t display_height;
uint64_t pixel_width;
uint64_t pixel_height;
EbmlBin color_space;
uint64_t display_unit;
uint64_t interlaced;
uint64_t field_order;
uint64_t stereo_mode;
uint64_t alpha_mode;
EbmlList color;
MatroskaTrackVideoProjection projection;
} MatroskaTrackVideo;
typedef struct MatroskaTrackAudio {
double samplerate;
double out_samplerate;
uint64_t bitdepth;
uint64_t channels;
/* real audio header (extracted from extradata) */
int coded_framesize;
int sub_packet_h;
int frame_size;
int sub_packet_size;
int sub_packet_cnt;
int pkt_cnt;
uint64_t buf_timecode;
uint8_t *buf;
} MatroskaTrackAudio;
typedef struct MatroskaTrackPlane {
uint64_t uid;
uint64_t type;
} MatroskaTrackPlane;
typedef struct MatroskaTrackOperation {
EbmlList combine_planes;
} MatroskaTrackOperation;
typedef struct MatroskaTrack {
uint64_t num;
uint64_t uid;
uint64_t type;
char *name;
char *codec_id;
EbmlBin codec_priv;
char *language;
double time_scale;
uint64_t default_duration;
uint64_t flag_default;
uint64_t flag_forced;
uint64_t flag_comment;
uint64_t flag_hearingimpaired;
uint64_t flag_visualimpaired;
uint64_t flag_textdescriptions;
CountedElement flag_original;
uint64_t seek_preroll;
MatroskaTrackVideo video;
MatroskaTrackAudio audio;
MatroskaTrackOperation operation;
EbmlList encodings;
uint64_t codec_delay;
uint64_t codec_delay_in_track_tb;
AVStream *stream;
int64_t end_timecode;
int ms_compat;
int needs_decoding;
uint64_t max_block_additional_id;
uint32_t palette[AVPALETTE_COUNT];
int has_palette;
} MatroskaTrack;
typedef struct MatroskaAttachment {
uint64_t uid;
char *filename;
char *description;
char *mime;
EbmlBin bin;
AVStream *stream;
} MatroskaAttachment;
typedef struct MatroskaChapter {
uint64_t start;
uint64_t end;
uint64_t uid;
char *title;
AVChapter *chapter;
} MatroskaChapter;
typedef struct MatroskaIndexPos {
uint64_t track;
uint64_t pos;
} MatroskaIndexPos;
typedef struct MatroskaIndex {
uint64_t time;
EbmlList pos;
} MatroskaIndex;
typedef struct MatroskaTag {
char *name;
char *string;
char *lang;
uint64_t def;
EbmlList sub;
} MatroskaTag;
typedef struct MatroskaTagTarget {
char *type;
uint64_t typevalue;
uint64_t trackuid;
uint64_t chapteruid;
uint64_t attachuid;
} MatroskaTagTarget;
typedef struct MatroskaTags {
MatroskaTagTarget target;
EbmlList tag;
} MatroskaTags;
typedef struct MatroskaSeekhead {
uint64_t id;
uint64_t pos;
} MatroskaSeekhead;
typedef struct MatroskaLevel {
uint64_t start;
uint64_t length;
} MatroskaLevel;
typedef struct MatroskaBlock {
uint64_t duration;
CountedElement reference;
uint64_t non_simple;
EbmlBin bin;
uint64_t additional_id;
EbmlBin additional;
int64_t discard_padding;
} MatroskaBlock;
typedef struct MatroskaCluster {
MatroskaBlock block;
uint64_t timecode;
int64_t pos;
} MatroskaCluster;
typedef struct MatroskaLevel1Element {
int64_t pos;
uint32_t id;
int parsed;
} MatroskaLevel1Element;
typedef struct MatroskaDemuxContext {
const AVClass *class;
AVFormatContext *ctx;
/* EBML stuff */
MatroskaLevel levels[EBML_MAX_DEPTH];
int num_levels;
uint32_t current_id;
int64_t resync_pos;
int unknown_count;
uint64_t time_scale;
double duration;
char *title;
char *muxingapp;
EbmlBin date_utc;
EbmlList tracks;
EbmlList attachments;
EbmlList chapters;
EbmlList index;
EbmlList tags;
EbmlList seekhead;
/* byte position of the segment inside the stream */
int64_t segment_start;
/* This packet coincides with FFFormatContext.parse_pkt
* and is not owned by us. */
AVPacket *pkt;
/* the packet queue */
PacketList *queue;
PacketList *queue_end;
int done;
/* What to skip before effectively reading a packet. */
int skip_to_keyframe;
uint64_t skip_to_timecode;
/* File has a CUES element, but we defer parsing until it is needed. */
int cues_parsing_deferred;
/* Level1 elements and whether they were read yet */
MatroskaLevel1Element level1_elems[64];
int num_level1_elems;
MatroskaCluster current_cluster;
/* WebM DASH Manifest live flag */
int is_live;
/* Bandwidth value for WebM DASH Manifest */
int bandwidth;
} MatroskaDemuxContext;
#define CHILD_OF(parent) { .def = { .n = parent } }
// The following forward declarations need their size because
// a tentative definition with internal linkage must not be an
// incomplete type (6.7.2 in C90, 6.9.2 in C99).
// Removing the sizes breaks MSVC.
static EbmlSyntax ebml_syntax[3], matroska_segment[9], matroska_track_video_color[15], matroska_track_video[19],
matroska_track[32], matroska_track_encoding[6], matroska_track_encodings[2],
matroska_track_combine_planes[2], matroska_track_operation[2], matroska_tracks[2],
matroska_attachments[2], matroska_chapter_entry[9], matroska_chapter[6], matroska_chapters[2],
matroska_index_entry[3], matroska_index[2], matroska_tag[3], matroska_tags[2], matroska_seekhead[2],
matroska_blockadditions[2], matroska_blockgroup[8], matroska_cluster_parsing[8];
static EbmlSyntax ebml_header[] = {
{ EBML_ID_EBMLREADVERSION, EBML_UINT, 0, 0, offsetof(Ebml, version), { .u = EBML_VERSION } },
{ EBML_ID_EBMLMAXSIZELENGTH, EBML_UINT, 0, 0, offsetof(Ebml, max_size), { .u = 8 } },
{ EBML_ID_EBMLMAXIDLENGTH, EBML_UINT, 0, 0, offsetof(Ebml, id_length), { .u = 4 } },
{ EBML_ID_DOCTYPE, EBML_STR, 0, 0, offsetof(Ebml, doctype), { .s = "(none)" } },
{ EBML_ID_DOCTYPEREADVERSION, EBML_UINT, 0, 0, offsetof(Ebml, doctype_version), { .u = 1 } },
{ EBML_ID_EBMLVERSION, EBML_NONE },
{ EBML_ID_DOCTYPEVERSION, EBML_NONE },
CHILD_OF(ebml_syntax)
};
static EbmlSyntax ebml_syntax[] = {
{ EBML_ID_HEADER, EBML_NEST, 0, 0, 0, { .n = ebml_header } },
{ MATROSKA_ID_SEGMENT, EBML_STOP },
{ 0 }
};
static EbmlSyntax matroska_info[] = {
{ MATROSKA_ID_TIMECODESCALE, EBML_UINT, 0, 0, offsetof(MatroskaDemuxContext, time_scale), { .u = 1000000 } },
{ MATROSKA_ID_DURATION, EBML_FLOAT, 0, 0, offsetof(MatroskaDemuxContext, duration) },
{ MATROSKA_ID_TITLE, EBML_UTF8, 0, 0, offsetof(MatroskaDemuxContext, title) },
{ MATROSKA_ID_WRITINGAPP, EBML_NONE },
{ MATROSKA_ID_MUXINGAPP, EBML_UTF8, 0, 0, offsetof(MatroskaDemuxContext, muxingapp) },
{ MATROSKA_ID_DATEUTC, EBML_BIN, 0, 0, offsetof(MatroskaDemuxContext, date_utc) },
{ MATROSKA_ID_SEGMENTUID, EBML_NONE },
CHILD_OF(matroska_segment)
};
static EbmlSyntax matroska_mastering_meta[] = {
{ MATROSKA_ID_VIDEOCOLOR_RX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, r_x) },
{ MATROSKA_ID_VIDEOCOLOR_RY, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, r_y) },
{ MATROSKA_ID_VIDEOCOLOR_GX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, g_x) },
{ MATROSKA_ID_VIDEOCOLOR_GY, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, g_y) },
{ MATROSKA_ID_VIDEOCOLOR_BX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, b_x) },
{ MATROSKA_ID_VIDEOCOLOR_BY, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, b_y) },
{ MATROSKA_ID_VIDEOCOLOR_WHITEX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, white_x) },
{ MATROSKA_ID_VIDEOCOLOR_WHITEY, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, white_y) },
{ MATROSKA_ID_VIDEOCOLOR_LUMINANCEMIN, EBML_FLOAT, 1, 0, offsetof(MatroskaMasteringMeta, min_luminance) },
{ MATROSKA_ID_VIDEOCOLOR_LUMINANCEMAX, EBML_FLOAT, 0, 0, offsetof(MatroskaMasteringMeta, max_luminance) },
CHILD_OF(matroska_track_video_color)
};
static EbmlSyntax matroska_track_video_color[] = {
{ MATROSKA_ID_VIDEOCOLORMATRIXCOEFF, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, matrix_coefficients), { .u = AVCOL_SPC_UNSPECIFIED } },
{ MATROSKA_ID_VIDEOCOLORBITSPERCHANNEL, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, bits_per_channel), { .u = 0 } },
{ MATROSKA_ID_VIDEOCOLORCHROMASUBHORZ, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_horz) },
{ MATROSKA_ID_VIDEOCOLORCHROMASUBVERT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, chroma_sub_vert) },
{ MATROSKA_ID_VIDEOCOLORCBSUBHORZ, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, cb_sub_horz) },
{ MATROSKA_ID_VIDEOCOLORCBSUBVERT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, cb_sub_vert) },
{ MATROSKA_ID_VIDEOCOLORCHROMASITINGHORZ, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, chroma_siting_horz), { .u = MATROSKA_COLOUR_CHROMASITINGHORZ_UNDETERMINED } },
{ MATROSKA_ID_VIDEOCOLORCHROMASITINGVERT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, chroma_siting_vert), { .u = MATROSKA_COLOUR_CHROMASITINGVERT_UNDETERMINED } },
{ MATROSKA_ID_VIDEOCOLORRANGE, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, range), { .u = AVCOL_RANGE_UNSPECIFIED } },
{ MATROSKA_ID_VIDEOCOLORTRANSFERCHARACTERISTICS, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, transfer_characteristics), { .u = AVCOL_TRC_UNSPECIFIED } },
{ MATROSKA_ID_VIDEOCOLORPRIMARIES, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, primaries), { .u = AVCOL_PRI_UNSPECIFIED } },
{ MATROSKA_ID_VIDEOCOLORMAXCLL, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, max_cll) },
{ MATROSKA_ID_VIDEOCOLORMAXFALL, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoColor, max_fall) },
{ MATROSKA_ID_VIDEOCOLORMASTERINGMETA, EBML_NEST, 0, 0, offsetof(MatroskaTrackVideoColor, mastering_meta), { .n = matroska_mastering_meta } },
CHILD_OF(matroska_track_video)
};
static EbmlSyntax matroska_track_video_projection[] = {
{ MATROSKA_ID_VIDEOPROJECTIONTYPE, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideoProjection, type), { .u = MATROSKA_VIDEO_PROJECTION_TYPE_RECTANGULAR } },
{ MATROSKA_ID_VIDEOPROJECTIONPRIVATE, EBML_BIN, 0, 0, offsetof(MatroskaTrackVideoProjection, private) },
{ MATROSKA_ID_VIDEOPROJECTIONPOSEYAW, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackVideoProjection, yaw), { .f = 0.0 } },
{ MATROSKA_ID_VIDEOPROJECTIONPOSEPITCH, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackVideoProjection, pitch), { .f = 0.0 } },
{ MATROSKA_ID_VIDEOPROJECTIONPOSEROLL, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackVideoProjection, roll), { .f = 0.0 } },
CHILD_OF(matroska_track_video)
};
static EbmlSyntax matroska_track_video[] = {
{ MATROSKA_ID_VIDEOFRAMERATE, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackVideo, frame_rate) },
{ MATROSKA_ID_VIDEODISPLAYWIDTH, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, display_width), { .u=-1 } },
{ MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, display_height), { .u=-1 } },
{ MATROSKA_ID_VIDEOPIXELWIDTH, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, pixel_width) },
{ MATROSKA_ID_VIDEOPIXELHEIGHT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, pixel_height) },
{ MATROSKA_ID_VIDEOCOLORSPACE, EBML_BIN, 0, 0, offsetof(MatroskaTrackVideo, color_space) },
{ MATROSKA_ID_VIDEOALPHAMODE, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, alpha_mode), { .u = 0 } },
{ MATROSKA_ID_VIDEOCOLOR, EBML_NEST, 0, sizeof(MatroskaTrackVideoColor), offsetof(MatroskaTrackVideo, color), { .n = matroska_track_video_color } },
{ MATROSKA_ID_VIDEOPROJECTION, EBML_NEST, 0, 0, offsetof(MatroskaTrackVideo, projection), { .n = matroska_track_video_projection } },
{ MATROSKA_ID_VIDEOPIXELCROPB, EBML_NONE },
{ MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
{ MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
{ MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
{ MATROSKA_ID_VIDEODISPLAYUNIT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, display_unit), { .u= MATROSKA_VIDEO_DISPLAYUNIT_PIXELS } },
{ MATROSKA_ID_VIDEOFLAGINTERLACED, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, interlaced), { .u = MATROSKA_VIDEO_INTERLACE_FLAG_UNDETERMINED } },
{ MATROSKA_ID_VIDEOFIELDORDER, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, field_order), { .u = MATROSKA_VIDEO_FIELDORDER_UNDETERMINED } },
{ MATROSKA_ID_VIDEOSTEREOMODE, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, stereo_mode), { .u = MATROSKA_VIDEO_STEREOMODE_TYPE_NB } },
{ MATROSKA_ID_VIDEOASPECTRATIO, EBML_NONE },
CHILD_OF(matroska_track)
};
static EbmlSyntax matroska_track_audio[] = {
{ MATROSKA_ID_AUDIOSAMPLINGFREQ, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackAudio, samplerate), { .f = 8000.0 } },
{ MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, EBML_FLOAT, 0, 0, offsetof(MatroskaTrackAudio, out_samplerate) },
{ MATROSKA_ID_AUDIOBITDEPTH, EBML_UINT, 0, 0, offsetof(MatroskaTrackAudio, bitdepth) },
{ MATROSKA_ID_AUDIOCHANNELS, EBML_UINT, 0, 0, offsetof(MatroskaTrackAudio, channels), { .u = 1 } },
CHILD_OF(matroska_track)
};
static EbmlSyntax matroska_track_encoding_compression[] = {
{ MATROSKA_ID_ENCODINGCOMPALGO, EBML_UINT, 0, 0, offsetof(MatroskaTrackCompression, algo), { .u = MATROSKA_TRACK_ENCODING_COMP_ZLIB } },
{ MATROSKA_ID_ENCODINGCOMPSETTINGS, EBML_BIN, 0, 0, offsetof(MatroskaTrackCompression, settings) },
CHILD_OF(matroska_track_encoding)
};
static EbmlSyntax matroska_track_encoding_encryption[] = {
{ MATROSKA_ID_ENCODINGENCALGO, EBML_UINT, 0, 0, offsetof(MatroskaTrackEncryption,algo), {.u = 0} },
{ MATROSKA_ID_ENCODINGENCKEYID, EBML_BIN, 0, 0, offsetof(MatroskaTrackEncryption,key_id) },
{ MATROSKA_ID_ENCODINGENCAESSETTINGS, EBML_NONE },
{ MATROSKA_ID_ENCODINGSIGALGO, EBML_NONE },
{ MATROSKA_ID_ENCODINGSIGHASHALGO, EBML_NONE },
{ MATROSKA_ID_ENCODINGSIGKEYID, EBML_NONE },
{ MATROSKA_ID_ENCODINGSIGNATURE, EBML_NONE },
CHILD_OF(matroska_track_encoding)
};
static EbmlSyntax matroska_track_encoding[] = {
{ MATROSKA_ID_ENCODINGSCOPE, EBML_UINT, 0, 0, offsetof(MatroskaTrackEncoding, scope), { .u = 1 } },
{ MATROSKA_ID_ENCODINGTYPE, EBML_UINT, 0, 0, offsetof(MatroskaTrackEncoding, type), { .u = 0 } },
{ MATROSKA_ID_ENCODINGCOMPRESSION, EBML_NEST, 0, 0, offsetof(MatroskaTrackEncoding, compression), { .n = matroska_track_encoding_compression } },
{ MATROSKA_ID_ENCODINGENCRYPTION, EBML_NEST, 0, 0, offsetof(MatroskaTrackEncoding, encryption), { .n = matroska_track_encoding_encryption } },
{ MATROSKA_ID_ENCODINGORDER, EBML_NONE },
CHILD_OF(matroska_track_encodings)
};
static EbmlSyntax matroska_track_encodings[] = {
{ MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, 0, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack, encodings), { .n = matroska_track_encoding } },
CHILD_OF(matroska_track)
};
static EbmlSyntax matroska_track_plane[] = {
{ MATROSKA_ID_TRACKPLANEUID, EBML_UINT, 0, 0, offsetof(MatroskaTrackPlane,uid) },
{ MATROSKA_ID_TRACKPLANETYPE, EBML_UINT, 0, 0, offsetof(MatroskaTrackPlane,type) },
CHILD_OF(matroska_track_combine_planes)
};
static EbmlSyntax matroska_track_combine_planes[] = {
{ MATROSKA_ID_TRACKPLANE, EBML_NEST, 0, sizeof(MatroskaTrackPlane), offsetof(MatroskaTrackOperation,combine_planes), {.n = matroska_track_plane} },
CHILD_OF(matroska_track_operation)
};
static EbmlSyntax matroska_track_operation[] = {
{ MATROSKA_ID_TRACKCOMBINEPLANES, EBML_NEST, 0, 0, 0, {.n = matroska_track_combine_planes} },
CHILD_OF(matroska_track)
};
static EbmlSyntax matroska_track[] = {
{ MATROSKA_ID_TRACKNUMBER, EBML_UINT, 0, 0, offsetof(MatroskaTrack, num) },
{ MATROSKA_ID_TRACKNAME, EBML_UTF8, 0, 0, offsetof(MatroskaTrack, name) },
{ MATROSKA_ID_TRACKUID, EBML_UINT, 0, 0, offsetof(MatroskaTrack, uid) },
{ MATROSKA_ID_TRACKTYPE, EBML_UINT, 0, 0, offsetof(MatroskaTrack, type) },
{ MATROSKA_ID_CODECID, EBML_STR, 0, 0, offsetof(MatroskaTrack, codec_id) },
{ MATROSKA_ID_CODECPRIVATE, EBML_BIN, 0, 0, offsetof(MatroskaTrack, codec_priv) },
{ MATROSKA_ID_CODECDELAY, EBML_UINT, 0, 0, offsetof(MatroskaTrack, codec_delay), { .u = 0 } },
{ MATROSKA_ID_TRACKLANGUAGE, EBML_STR, 0, 0, offsetof(MatroskaTrack, language), { .s = "eng" } },
{ MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, 0, offsetof(MatroskaTrack, default_duration) },
{ MATROSKA_ID_TRACKTIMECODESCALE, EBML_FLOAT, 0, 0, offsetof(MatroskaTrack, time_scale), { .f = 1.0 } },
{ MATROSKA_ID_TRACKFLAGCOMMENTARY, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_comment), { .u = 0 } },
{ MATROSKA_ID_TRACKFLAGDEFAULT, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_default), { .u = 1 } },
{ MATROSKA_ID_TRACKFLAGFORCED, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_forced), { .u = 0 } },
{ MATROSKA_ID_TRACKFLAGHEARINGIMPAIRED, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_hearingimpaired), { .u = 0 } },
{ MATROSKA_ID_TRACKFLAGVISUALIMPAIRED, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_visualimpaired), { .u = 0 } },
{ MATROSKA_ID_TRACKFLAGTEXTDESCRIPTIONS, EBML_UINT, 0, 0, offsetof(MatroskaTrack, flag_textdescriptions), { .u = 0 } },
{ MATROSKA_ID_TRACKFLAGORIGINAL, EBML_UINT, 1, 0, offsetof(MatroskaTrack, flag_original), {.u = 0 } },
{ MATROSKA_ID_TRACKVIDEO, EBML_NEST, 0, 0, offsetof(MatroskaTrack, video), { .n = matroska_track_video } },
{ MATROSKA_ID_TRACKAUDIO, EBML_NEST, 0, 0, offsetof(MatroskaTrack, audio), { .n = matroska_track_audio } },
{ MATROSKA_ID_TRACKOPERATION, EBML_NEST, 0, 0, offsetof(MatroskaTrack, operation), { .n = matroska_track_operation } },
{ MATROSKA_ID_TRACKCONTENTENCODINGS, EBML_NEST, 0, 0, 0, { .n = matroska_track_encodings } },
{ MATROSKA_ID_TRACKMAXBLKADDID, EBML_UINT, 0, 0, offsetof(MatroskaTrack, max_block_additional_id), { .u = 0 } },
{ MATROSKA_ID_SEEKPREROLL, EBML_UINT, 0, 0, offsetof(MatroskaTrack, seek_preroll), { .u = 0 } },
{ MATROSKA_ID_TRACKFLAGENABLED, EBML_NONE },
{ MATROSKA_ID_TRACKFLAGLACING, EBML_NONE },
{ MATROSKA_ID_CODECNAME, EBML_NONE },
{ MATROSKA_ID_CODECDECODEALL, EBML_NONE },
{ MATROSKA_ID_CODECINFOURL, EBML_NONE },
{ MATROSKA_ID_CODECDOWNLOADURL, EBML_NONE },
{ MATROSKA_ID_TRACKMINCACHE, EBML_NONE },
{ MATROSKA_ID_TRACKMAXCACHE, EBML_NONE },
CHILD_OF(matroska_tracks)
};
static EbmlSyntax matroska_tracks[] = {
{ MATROSKA_ID_TRACKENTRY, EBML_NEST, 0, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext, tracks), { .n = matroska_track } },
CHILD_OF(matroska_segment)
};
static EbmlSyntax matroska_attachment[] = {
{ MATROSKA_ID_FILEUID, EBML_UINT, 0, 0, offsetof(MatroskaAttachment, uid) },
{ MATROSKA_ID_FILENAME, EBML_UTF8, 0, 0, offsetof(MatroskaAttachment, filename) },
{ MATROSKA_ID_FILEMIMETYPE, EBML_STR, 0, 0, offsetof(MatroskaAttachment, mime) },
{ MATROSKA_ID_FILEDATA, EBML_BIN, 0, 0, offsetof(MatroskaAttachment, bin) },
{ MATROSKA_ID_FILEDESC, EBML_UTF8, 0, 0, offsetof(MatroskaAttachment, description) },
CHILD_OF(matroska_attachments)
};
static EbmlSyntax matroska_attachments[] = {
{ MATROSKA_ID_ATTACHEDFILE, EBML_NEST, 0, sizeof(MatroskaAttachment), offsetof(MatroskaDemuxContext, attachments), { .n = matroska_attachment } },
CHILD_OF(matroska_segment)
};
static EbmlSyntax matroska_chapter_display[] = {
{ MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, 0, offsetof(MatroskaChapter, title) },
{ MATROSKA_ID_CHAPLANG, EBML_NONE },
{ MATROSKA_ID_CHAPCOUNTRY, EBML_NONE },
CHILD_OF(matroska_chapter_entry)
};
static EbmlSyntax matroska_chapter_entry[] = {
{ MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, 0, offsetof(MatroskaChapter, start), { .u = AV_NOPTS_VALUE } },
{ MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, 0, offsetof(MatroskaChapter, end), { .u = AV_NOPTS_VALUE } },
{ MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, 0, offsetof(MatroskaChapter, uid) },
{ MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, 0, { .n = matroska_chapter_display } },
{ MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
{ MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
{ MATROSKA_ID_CHAPTERPHYSEQUIV, EBML_NONE },
{ MATROSKA_ID_CHAPTERATOM, EBML_NONE },
CHILD_OF(matroska_chapter)
};
static EbmlSyntax matroska_chapter[] = {
{ MATROSKA_ID_CHAPTERATOM, EBML_NEST, 0, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext, chapters), { .n = matroska_chapter_entry } },
{ MATROSKA_ID_EDITIONUID, EBML_NONE },
{ MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
{ MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
{ MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
CHILD_OF(matroska_chapters)
};
static EbmlSyntax matroska_chapters[] = {
{ MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, 0, { .n = matroska_chapter } },
CHILD_OF(matroska_segment)
};
static EbmlSyntax matroska_index_pos[] = {
{ MATROSKA_ID_CUETRACK, EBML_UINT, 0, 0, offsetof(MatroskaIndexPos, track) },
{ MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, 0, offsetof(MatroskaIndexPos, pos) },
{ MATROSKA_ID_CUERELATIVEPOSITION,EBML_NONE },
{ MATROSKA_ID_CUEDURATION, EBML_NONE },
{ MATROSKA_ID_CUEBLOCKNUMBER, EBML_NONE },
CHILD_OF(matroska_index_entry)
};
static EbmlSyntax matroska_index_entry[] = {
{ MATROSKA_ID_CUETIME, EBML_UINT, 0, 0, offsetof(MatroskaIndex, time) },
{ MATROSKA_ID_CUETRACKPOSITION, EBML_NEST, 0, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex, pos), { .n = matroska_index_pos } },
CHILD_OF(matroska_index)
};
static EbmlSyntax matroska_index[] = {
{ MATROSKA_ID_POINTENTRY, EBML_NEST, 0, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext, index), { .n = matroska_index_entry } },
CHILD_OF(matroska_segment)
};
static EbmlSyntax matroska_simpletag[] = {
{ MATROSKA_ID_TAGNAME, EBML_UTF8, 0, 0, offsetof(MatroskaTag, name) },
{ MATROSKA_ID_TAGSTRING, EBML_UTF8, 0, 0, offsetof(MatroskaTag, string) },
{ MATROSKA_ID_TAGLANG, EBML_STR, 0, 0, offsetof(MatroskaTag, lang), { .s = "und" } },
{ MATROSKA_ID_TAGDEFAULT, EBML_UINT, 0, 0, offsetof(MatroskaTag, def) },
{ MATROSKA_ID_TAGDEFAULT_BUG, EBML_UINT, 0, 0, offsetof(MatroskaTag, def) },
{ MATROSKA_ID_SIMPLETAG, EBML_NEST, 0, sizeof(MatroskaTag), offsetof(MatroskaTag, sub), { .n = matroska_simpletag } },
CHILD_OF(matroska_tag)
};
static EbmlSyntax matroska_tagtargets[] = {
{ MATROSKA_ID_TAGTARGETS_TYPE, EBML_STR, 0, 0, offsetof(MatroskaTagTarget, type) },
{ MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, 0, offsetof(MatroskaTagTarget, typevalue), { .u = 50 } },
{ MATROSKA_ID_TAGTARGETS_TRACKUID, EBML_UINT, 0, 0, offsetof(MatroskaTagTarget, trackuid), { .u = 0 } },
{ MATROSKA_ID_TAGTARGETS_CHAPTERUID, EBML_UINT, 0, 0, offsetof(MatroskaTagTarget, chapteruid), { .u = 0 } },
{ MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, 0, offsetof(MatroskaTagTarget, attachuid), { .u = 0 } },
CHILD_OF(matroska_tag)
};
static EbmlSyntax matroska_tag[] = {
{ MATROSKA_ID_SIMPLETAG, EBML_NEST, 0, sizeof(MatroskaTag), offsetof(MatroskaTags, tag), { .n = matroska_simpletag } },
{ MATROSKA_ID_TAGTARGETS, EBML_NEST, 0, 0, offsetof(MatroskaTags, target), { .n = matroska_tagtargets } },
CHILD_OF(matroska_tags)
};
static EbmlSyntax matroska_tags[] = {
{ MATROSKA_ID_TAG, EBML_NEST, 0, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext, tags), { .n = matroska_tag } },
CHILD_OF(matroska_segment)
};
static EbmlSyntax matroska_seekhead_entry[] = {
{ MATROSKA_ID_SEEKID, EBML_UINT, 0, 0, offsetof(MatroskaSeekhead, id) },
{ MATROSKA_ID_SEEKPOSITION, EBML_UINT, 0, 0, offsetof(MatroskaSeekhead, pos), { .u = -1 } },
CHILD_OF(matroska_seekhead)
};
static EbmlSyntax matroska_seekhead[] = {
{ MATROSKA_ID_SEEKENTRY, EBML_NEST, 0, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext, seekhead), { .n = matroska_seekhead_entry } },
CHILD_OF(matroska_segment)
};
static EbmlSyntax matroska_segment[] = {
{ MATROSKA_ID_CLUSTER, EBML_STOP },
{ MATROSKA_ID_INFO, EBML_LEVEL1, 0, 0, 0, { .n = matroska_info } },
{ MATROSKA_ID_TRACKS, EBML_LEVEL1, 0, 0, 0, { .n = matroska_tracks } },
{ MATROSKA_ID_ATTACHMENTS, EBML_LEVEL1, 0, 0, 0, { .n = matroska_attachments } },
{ MATROSKA_ID_CHAPTERS, EBML_LEVEL1, 0, 0, 0, { .n = matroska_chapters } },
{ MATROSKA_ID_CUES, EBML_LEVEL1, 0, 0, 0, { .n = matroska_index } },
{ MATROSKA_ID_TAGS, EBML_LEVEL1, 0, 0, 0, { .n = matroska_tags } },
{ MATROSKA_ID_SEEKHEAD, EBML_LEVEL1, 0, 0, 0, { .n = matroska_seekhead } },
{ 0 } /* We don't want to go back to level 0, so don't add the parent. */
};
static EbmlSyntax matroska_segments[] = {
{ MATROSKA_ID_SEGMENT, EBML_NEST, 0, 0, 0, { .n = matroska_segment } },
{ 0 }
};
static EbmlSyntax matroska_blockmore[] = {
{ MATROSKA_ID_BLOCKADDID, EBML_UINT, 0, 0, offsetof(MatroskaBlock,additional_id), { .u = 1 } },
{ MATROSKA_ID_BLOCKADDITIONAL, EBML_BIN, 0, 0, offsetof(MatroskaBlock,additional) },
CHILD_OF(matroska_blockadditions)
};
static EbmlSyntax matroska_blockadditions[] = {
{ MATROSKA_ID_BLOCKMORE, EBML_NEST, 0, 0, 0, {.n = matroska_blockmore} },
CHILD_OF(matroska_blockgroup)
};
static EbmlSyntax matroska_blockgroup[] = {
{ MATROSKA_ID_BLOCK, EBML_BIN, 0, 0, offsetof(MatroskaBlock, bin) },
{ MATROSKA_ID_BLOCKADDITIONS, EBML_NEST, 0, 0, 0, { .n = matroska_blockadditions} },
{ MATROSKA_ID_BLOCKDURATION, EBML_UINT, 0, 0, offsetof(MatroskaBlock, duration) },
{ MATROSKA_ID_DISCARDPADDING, EBML_SINT, 0, 0, offsetof(MatroskaBlock, discard_padding) },
{ MATROSKA_ID_BLOCKREFERENCE, EBML_SINT, 1, 0, offsetof(MatroskaBlock, reference) },
{ MATROSKA_ID_CODECSTATE, EBML_NONE },
{ 1, EBML_UINT, 0, 0, offsetof(MatroskaBlock, non_simple), { .u = 1 } },
CHILD_OF(matroska_cluster_parsing)
};
// The following array contains SimpleBlock and BlockGroup twice
// in order to reuse the other values for matroska_cluster_enter.
static EbmlSyntax matroska_cluster_parsing[] = {
{ MATROSKA_ID_SIMPLEBLOCK, EBML_BIN, 0, 0, offsetof(MatroskaBlock, bin) },
{ MATROSKA_ID_BLOCKGROUP, EBML_NEST, 0, 0, 0, { .n = matroska_blockgroup } },
{ MATROSKA_ID_CLUSTERTIMECODE, EBML_UINT, 0, 0, offsetof(MatroskaCluster, timecode) },
{ MATROSKA_ID_SIMPLEBLOCK, EBML_STOP },
{ MATROSKA_ID_BLOCKGROUP, EBML_STOP },
{ MATROSKA_ID_CLUSTERPOSITION, EBML_NONE },
{ MATROSKA_ID_CLUSTERPREVSIZE, EBML_NONE },
CHILD_OF(matroska_segment)
};
static EbmlSyntax matroska_cluster_enter[] = {
{ MATROSKA_ID_CLUSTER, EBML_NEST, 0, 0, 0, { .n = &matroska_cluster_parsing[2] } },
{ 0 }
};
#undef CHILD_OF
static const CodecMime mkv_image_mime_tags[] = {
{"image/gif" , AV_CODEC_ID_GIF},
{"image/jpeg" , AV_CODEC_ID_MJPEG},
{"image/png" , AV_CODEC_ID_PNG},
{"image/tiff" , AV_CODEC_ID_TIFF},
{"" , AV_CODEC_ID_NONE}
};
static const CodecMime mkv_mime_tags[] = {
{"text/plain" , AV_CODEC_ID_TEXT},
{"application/x-truetype-font", AV_CODEC_ID_TTF},
{"application/x-font" , AV_CODEC_ID_TTF},
{"application/vnd.ms-opentype", AV_CODEC_ID_OTF},
{"binary" , AV_CODEC_ID_BIN_DATA},
{"" , AV_CODEC_ID_NONE}
};
static const char *const matroska_doctypes[] = { "matroska", "webm" };
/*
* This function prepares the status for parsing of level 1 elements.
*/
static int matroska_reset_status(MatroskaDemuxContext *matroska,
uint32_t id, int64_t position)
{
int64_t err = 0;
if (position >= 0) {
err = avio_seek(matroska->ctx->pb, position, SEEK_SET);
if (err > 0)
err = 0;
} else
position = avio_tell(matroska->ctx->pb);
matroska->current_id = id;
matroska->num_levels = 1;
matroska->unknown_count = 0;
matroska->resync_pos = position;
if (id)
matroska->resync_pos -= (av_log2(id) + 7) / 8;
return err;
}
static int matroska_resync(MatroskaDemuxContext *matroska, int64_t last_pos)
{
AVIOContext *pb = matroska->ctx->pb;
uint32_t id;
/* Try to seek to the last position to resync from. If this doesn't work,
* we resync from the earliest position available: The start of the buffer. */
if (last_pos < avio_tell(pb) && avio_seek(pb, last_pos + 1, SEEK_SET) < 0) {
av_log(matroska->ctx, AV_LOG_WARNING,
"Seek to desired resync point failed. Seeking to "
"earliest point available instead.\n");
avio_seek(pb, FFMAX(avio_tell(pb) + (pb->buffer - pb->buf_ptr),
last_pos + 1), SEEK_SET);
}
id = avio_rb32(pb);
// try to find a toplevel element
while (!avio_feof(pb)) {
if (id == MATROSKA_ID_INFO || id == MATROSKA_ID_TRACKS ||
id == MATROSKA_ID_CUES || id == MATROSKA_ID_TAGS ||
id == MATROSKA_ID_SEEKHEAD || id == MATROSKA_ID_ATTACHMENTS ||
id == MATROSKA_ID_CLUSTER || id == MATROSKA_ID_CHAPTERS) {
/* Prepare the context for parsing of a level 1 element. */
matroska_reset_status(matroska, id, -1);
/* Given that we are here means that an error has occurred,
* so treat the segment as unknown length in order not to
* discard valid data that happens to be beyond the designated
* end of the segment. */
matroska->levels[0].length = EBML_UNKNOWN_LENGTH;
return 0;
}
id = (id << 8) | avio_r8(pb);
}
matroska->done = 1;
return pb->error ? pb->error : AVERROR_EOF;
}
/*
* Read: an "EBML number", which is defined as a variable-length
* array of bytes. The first byte indicates the length by giving a
* number of 0-bits followed by a one. The position of the first
* "one" bit inside the first byte indicates the length of this
* number.
* Returns: number of bytes read, < 0 on error
*/
static int ebml_read_num(MatroskaDemuxContext *matroska, AVIOContext *pb,
int max_size, uint64_t *number, int eof_forbidden)
{
int read, n = 1;
uint64_t total;
int64_t pos;
/* The first byte tells us the length in bytes - except when it is zero. */
total = avio_r8(pb);
if (pb->eof_reached)
goto err;
/* get the length of the EBML number */
read = 8 - ff_log2_tab[total];
if (!total || read > max_size) {
pos = avio_tell(pb) - 1;
if (!total) {
av_log(matroska->ctx, AV_LOG_ERROR,
"0x00 at pos %"PRId64" (0x%"PRIx64") invalid as first byte "
"of an EBML number\n", pos, pos);
} else {
av_log(matroska->ctx, AV_LOG_ERROR,
"Length %d indicated by an EBML number's first byte 0x%02x "
"at pos %"PRId64" (0x%"PRIx64") exceeds max length %d.\n",
read, (uint8_t) total, pos, pos, max_size);
}
return AVERROR_INVALIDDATA;
}
/* read out length */
total ^= 1 << ff_log2_tab[total];
while (n++ < read)
total = (total << 8) | avio_r8(pb);
if (pb->eof_reached) {
eof_forbidden = 1;
goto err;
}
*number = total;
return read;
err:
pos = avio_tell(pb);
if (pb->error) {
av_log(matroska->ctx, AV_LOG_ERROR,
"Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
pos, pos);
return pb->error;
}
if (eof_forbidden) {
av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
"at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
return AVERROR(EIO);
}
return AVERROR_EOF;
}
/**
* Read a EBML length value.
* This needs special handling for the "unknown length" case which has multiple
* encodings.
*/
static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
uint64_t *number)
{
int res = ebml_read_num(matroska, pb, 8, number, 1);
if (res > 0 && *number + 1 == 1ULL << (7 * res))
*number = EBML_UNKNOWN_LENGTH;
return res;
}
/*
* Read the next element as an unsigned int.
* Returns NEEDS_CHECKING unless size == 0.
*/
static int ebml_read_uint(AVIOContext *pb, int size,
uint64_t default_value, uint64_t *num)
{
int n = 0;
if (size == 0) {
*num = default_value;
return 0;
}
/* big-endian ordering; build up number */
*num = 0;
while (n++ < size)
*num = (*num << 8) | avio_r8(pb);
return NEEDS_CHECKING;
}
/*
* Read the next element as a signed int.
* Returns NEEDS_CHECKING unless size == 0.
*/
static int ebml_read_sint(AVIOContext *pb, int size,
int64_t default_value, int64_t *num)
{
int n = 1;
if (size == 0) {
*num = default_value;
return 0;
} else {
*num = sign_extend(avio_r8(pb), 8);
/* big-endian ordering; build up number */
while (n++ < size)
*num = ((uint64_t)*num << 8) | avio_r8(pb);
}
return NEEDS_CHECKING;
}
/*
* Read the next element as a float.
* Returns 0 if size == 0, NEEDS_CHECKING or < 0 on obvious failure.
*/
static int ebml_read_float(AVIOContext *pb, int size,
double default_value, double *num)
{
if (size == 0) {
*num = default_value;
return 0;
} else if (size == 4) {
*num = av_int2float(avio_rb32(pb));
} else if (size == 8) {
*num = av_int2double(avio_rb64(pb));
} else
return AVERROR_INVALIDDATA;
return NEEDS_CHECKING;
}
/*
* Read the next element as an ASCII string.
* 0 is success, < 0 or NEEDS_CHECKING is failure.
*/
static int ebml_read_ascii(AVIOContext *pb, int size,
const char *default_value, char **str)
{
char *res;
int ret;
if (size == 0 && default_value) {
res = av_strdup(default_value);
if (!res)
return AVERROR(ENOMEM);
} else {
/* EBML strings are usually not 0-terminated, so we allocate one
* byte more, read the string and NUL-terminate it ourselves. */
if (!(res = av_malloc(size + 1)))
return AVERROR(ENOMEM);
if ((ret = avio_read(pb, (uint8_t *) res, size)) != size) {
av_free(res);
return ret < 0 ? ret : NEEDS_CHECKING;
}
(res)[size] = '\0';
}
av_free(*str);
*str = res;
return 0;
}
/*
* Read the next element as binary data.
* 0 is success, < 0 or NEEDS_CHECKING is failure.
*/
static int ebml_read_binary(AVIOContext *pb, int length,
int64_t pos, EbmlBin *bin)
{
int ret;
ret = av_buffer_realloc(&bin->buf, length + AV_INPUT_BUFFER_PADDING_SIZE);
if (ret < 0)
return ret;
memset(bin->buf->data + length, 0, AV_INPUT_BUFFER_PADDING_SIZE);
bin->data = bin->buf->data;
bin->size = length;
bin->pos = pos;
if ((ret = avio_read(pb, bin->data, length)) != length) {
av_buffer_unref(&bin->buf);
bin->data = NULL;
bin->size = 0;
return ret < 0 ? ret : NEEDS_CHECKING;
}
return 0;
}
/*
* Read the next element, but only the header. The contents
* are supposed to be sub-elements which can be read separately.
* 0 is success, < 0 is failure.
*/
static int ebml_read_master(MatroskaDemuxContext *matroska,
uint64_t length, int64_t pos)
{
MatroskaLevel *level;
if (matroska->num_levels >= EBML_MAX_DEPTH) {
av_log(matroska->ctx, AV_LOG_ERROR,
"File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
return AVERROR(ENOSYS);
}
level = &matroska->levels[matroska->num_levels++];
level->start = pos;
level->length = length;
return 0;
}
/*
* Read a signed "EBML number"
* Return: number of bytes processed, < 0 on error
*/
static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
AVIOContext *pb, int64_t *num)
{
uint64_t unum;
int res;
/* read as unsigned number first */
if ((res = ebml_read_num(matroska, pb, 8, &unum, 1)) < 0)
return res;
/* make signed (weird way) */
*num = unum - ((1LL << (7 * res - 1)) - 1);
return res;
}
static int ebml_parse(MatroskaDemuxContext *matroska,
EbmlSyntax *syntax, void *data);
static EbmlSyntax *ebml_parse_id(EbmlSyntax *syntax, uint32_t id)
{
int i;
// Whoever touches this should be aware of the duplication
// existing in matroska_cluster_parsing.
for (i = 0; syntax[i].id; i++)
if (id == syntax[i].id)
break;
return &syntax[i];
}
static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
void *data)
{
int res;
if (data) {
for (int i = 0; syntax[i].id; i++) {
void *dst = (char *)data + syntax[i].data_offset;
switch (syntax[i].type) {
case EBML_UINT:
*(uint64_t *)dst = syntax[i].def.u;
break;
case EBML_SINT:
*(int64_t *) dst = syntax[i].def.i;
break;
case EBML_FLOAT:
*(double *) dst = syntax[i].def.f;
break;
case EBML_STR:
case EBML_UTF8:
// the default may be NULL
if (syntax[i].def.s) {
*(char**)dst = av_strdup(syntax[i].def.s);
if (!*(char**)dst)
return AVERROR(ENOMEM);
}
break;
}
}
if (!matroska->levels[matroska->num_levels - 1].length) {
matroska->num_levels--;
return 0;
}
}
do {
res = ebml_parse(matroska, syntax, data);
} while (!res);
return res == LEVEL_ENDED ? 0 : res;
}
static int is_ebml_id_valid(uint32_t id)
{
// Due to endian nonsense in Matroska, the highest byte with any bits set
// will contain the leading length bit. This bit in turn identifies the
// total byte length of the element by its position within the byte.
unsigned int bits = av_log2(id);
return id && (bits + 7) / 8 == (8 - bits % 8);
}
/*
* Allocate and return the entry for the level1 element with the given ID. If
* an entry already exists, return the existing entry.
*/
static MatroskaLevel1Element *matroska_find_level1_elem(MatroskaDemuxContext *matroska,
uint32_t id, int64_t pos)
{
int i;
MatroskaLevel1Element *elem;
if (!is_ebml_id_valid(id))
return NULL;
// Some files link to all clusters; useless.
if (id == MATROSKA_ID_CLUSTER)
return NULL;
// There can be multiple SeekHeads and Tags.
for (i = 0; i < matroska->num_level1_elems; i++) {
if (matroska->level1_elems[i].id == id) {
if (matroska->level1_elems[i].pos == pos ||
id != MATROSKA_ID_SEEKHEAD && id != MATROSKA_ID_TAGS)
return &matroska->level1_elems[i];
}
}
// Only a completely broken file would have more elements.
if (matroska->num_level1_elems >= FF_ARRAY_ELEMS(matroska->level1_elems)) {
av_log(matroska->ctx, AV_LOG_ERROR, "Too many level1 elements.\n");
return NULL;
}
elem = &matroska->level1_elems[matroska->num_level1_elems++];
*elem = (MatroskaLevel1Element){.id = id};
return elem;
}
static int ebml_parse(MatroskaDemuxContext *matroska,
EbmlSyntax *syntax, void *data)
{
static const uint64_t max_lengths[EBML_TYPE_COUNT] = {
// Forbid unknown-length EBML_NONE elements.
[EBML_NONE] = EBML_UNKNOWN_LENGTH - 1,
[EBML_UINT] = 8,
[EBML_SINT] = 8,
[EBML_FLOAT] = 8,
// max. 16 MB for strings
[EBML_STR] = 0x1000000,
[EBML_UTF8] = 0x1000000,
// max. 256 MB for binary data
[EBML_BIN] = 0x10000000,
// no limits for anything else
};
AVIOContext *pb = matroska->ctx->pb;
uint32_t id;
uint64_t length;
int64_t pos = avio_tell(pb), pos_alt;
int res, update_pos = 1, level_check;
MatroskaLevel1Element *level1_elem;
MatroskaLevel *level = matroska->num_levels ? &matroska->levels[matroska->num_levels - 1] : NULL;
if (!matroska->current_id) {
uint64_t id;
res = ebml_read_num(matroska, pb, 4, &id, 0);
if (res < 0) {
if (pb->eof_reached && res == AVERROR_EOF) {
if (matroska->is_live)
// in live mode, finish parsing if EOF is reached.
return 1;
if (level && pos == avio_tell(pb)) {
if (level->length == EBML_UNKNOWN_LENGTH) {
// Unknown-length levels automatically end at EOF.
matroska->num_levels--;
return LEVEL_ENDED;
} else {
av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely "
"at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
}
}
}
return res;
}
matroska->current_id = id | 1 << 7 * res;
pos_alt = pos + res;
} else {
pos_alt = pos;
pos -= (av_log2(matroska->current_id) + 7) / 8;
}
id = matroska->current_id;
syntax = ebml_parse_id(syntax, id);
if (!syntax->id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
if (level && level->length == EBML_UNKNOWN_LENGTH) {
// Unknown-length levels end when an element from an upper level
// in the hierarchy is encountered.
while (syntax->def.n) {
syntax = ebml_parse_id(syntax->def.n, id);
if (syntax->id) {
matroska->num_levels--;
return LEVEL_ENDED;
}
};
}
av_log(matroska->ctx, AV_LOG_DEBUG, "Unknown entry 0x%"PRIX32" at pos. "
"%"PRId64"\n", id, pos);
update_pos = 0; /* Don't update resync_pos as an error might have happened. */
}
if (data) {
data = (char *) data + syntax->data_offset;
if (syntax->list_elem_size) {
EbmlList *list = data;
void *newelem;
if ((unsigned)list->nb_elem + 1 >= UINT_MAX / syntax->list_elem_size)
return AVERROR(ENOMEM);
newelem = av_fast_realloc(list->elem,
&list->alloc_elem_size,
(list->nb_elem + 1) * syntax->list_elem_size);
if (!newelem)
return AVERROR(ENOMEM);
list->elem = newelem;
data = (char *) list->elem + list->nb_elem * syntax->list_elem_size;
memset(data, 0, syntax->list_elem_size);
list->nb_elem++;
}
}
if (syntax->type != EBML_STOP) {
matroska->current_id = 0;
if ((res = ebml_read_length(matroska, pb, &length)) < 0)
return res;
pos_alt += res;
if (matroska->num_levels > 0) {
if (length != EBML_UNKNOWN_LENGTH &&
level->length != EBML_UNKNOWN_LENGTH) {
uint64_t elem_end = pos_alt + length,
level_end = level->start + level->length;
if (elem_end < level_end) {
level_check = 0;
} else if (elem_end == level_end) {
level_check = LEVEL_ENDED;
} else {
av_log(matroska->ctx, AV_LOG_ERROR,
"Element at 0x%"PRIx64" ending at 0x%"PRIx64" exceeds "
"containing master element ending at 0x%"PRIx64"\n",
pos, elem_end, level_end);
return AVERROR_INVALIDDATA;
}
} else if (length != EBML_UNKNOWN_LENGTH) {
level_check = 0;
} else if (level->length != EBML_UNKNOWN_LENGTH) {
av_log(matroska->ctx, AV_LOG_ERROR, "Unknown-sized element "
"at 0x%"PRIx64" inside parent with finite size\n", pos);
return AVERROR_INVALIDDATA;
} else {
level_check = 0;
if (id != MATROSKA_ID_CLUSTER && (syntax->type == EBML_LEVEL1
|| syntax->type == EBML_NEST)) {
// According to the current specifications only clusters and
// segments are allowed to be unknown-length. We also accept
// other unknown-length master elements.
av_log(matroska->ctx, AV_LOG_WARNING,
"Found unknown-length element 0x%"PRIX32" other than "
"a cluster at 0x%"PRIx64". Spec-incompliant, but "
"parsing will nevertheless be attempted.\n", id, pos);
update_pos = -1;
}
}
} else
level_check = 0;
if (max_lengths[syntax->type] && length > max_lengths[syntax->type]) {
if (length != EBML_UNKNOWN_LENGTH) {
av_log(matroska->ctx, AV_LOG_ERROR,
"Invalid length 0x%"PRIx64" > 0x%"PRIx64" for element "
"with ID 0x%"PRIX32" at 0x%"PRIx64"\n",
length, max_lengths[syntax->type], id, pos);
} else if (syntax->type != EBML_NONE) {
av_log(matroska->ctx, AV_LOG_ERROR,
"Element with ID 0x%"PRIX32" at pos. 0x%"PRIx64" has "
"unknown length, yet the length of an element of its "
"type must be known.\n", id, pos);
} else {
av_log(matroska->ctx, AV_LOG_ERROR,
"Found unknown-length element with ID 0x%"PRIX32" at "
"pos. 0x%"PRIx64" for which no syntax for parsing is "
"available.\n", id, pos);
}
return AVERROR_INVALIDDATA;
}
if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
// Loosing sync will likely manifest itself as encountering unknown
// elements which are not reliably distinguishable from elements
// belonging to future extensions of the format.
// We use a heuristic to detect such situations: If the current
// element is not expected at the current syntax level and there
// were only a few unknown elements in a row, then the element is
// skipped or considered defective based upon the length of the
// current element (i.e. how much would be skipped); if there were
// more than a few skipped elements in a row and skipping the current
// element would lead us more than SKIP_THRESHOLD away from the last
// known good position, then it is inferred that an error occurred.
// The dependency on the number of unknown elements in a row exists
// because the distance to the last known good position is
// automatically big if the last parsed element was big.
// In both cases, each unknown element is considered equivalent to
// UNKNOWN_EQUIV of skipped bytes for the check.
// The whole check is only done for non-seekable output, because
// in this situation skipped data can't simply be rechecked later.
// This is especially important when using unkown length elements
// as the check for whether a child exceeds its containing master
// element is not effective in this situation.
if (update_pos) {
matroska->unknown_count = 0;
} else {
int64_t dist = length + UNKNOWN_EQUIV * matroska->unknown_count++;
if (matroska->unknown_count > 3)
dist += pos_alt - matroska->resync_pos;
if (dist > SKIP_THRESHOLD) {
av_log(matroska->ctx, AV_LOG_ERROR,
"Unknown element %"PRIX32" at pos. 0x%"PRIx64" with "
"length 0x%"PRIx64" considered as invalid data. Last "
"known good position 0x%"PRIx64", %d unknown elements"
" in a row\n", id, pos, length, matroska->resync_pos,
matroska->unknown_count);
return AVERROR_INVALIDDATA;
}
}
}
if (update_pos > 0) {
// We have found an element that is allowed at this place
// in the hierarchy and it passed all checks, so treat the beginning
// of the element as the "last known good" position.
matroska->resync_pos = pos;
}
if (!data && length != EBML_UNKNOWN_LENGTH)
goto skip;
}
switch (syntax->type) {
case EBML_UINT:
res = ebml_read_uint(pb, length, syntax->def.u, data);
break;
case EBML_SINT:
res = ebml_read_sint(pb, length, syntax->def.i, data);
break;
case EBML_FLOAT:
res = ebml_read_float(pb, length, syntax->def.f, data);
break;
case EBML_STR:
case EBML_UTF8:
res = ebml_read_ascii(pb, length, syntax->def.s, data);
break;
case EBML_BIN:
res = ebml_read_binary(pb, length, pos_alt, data);
break;
case EBML_LEVEL1:
case EBML_NEST:
if ((res = ebml_read_master(matroska, length, pos_alt)) < 0)
return res;
if (id == MATROSKA_ID_SEGMENT)
matroska->segment_start = pos_alt;
if (id == MATROSKA_ID_CUES)
matroska->cues_parsing_deferred = 0;
if (syntax->type == EBML_LEVEL1 &&
(level1_elem = matroska_find_level1_elem(matroska, syntax->id, pos))) {
if (!level1_elem->pos) {
// Zero is not a valid position for a level 1 element.
level1_elem->pos = pos;
} else if (level1_elem->pos != pos)
av_log(matroska->ctx, AV_LOG_ERROR, "Duplicate element\n");
level1_elem->parsed = 1;
}
if (res = ebml_parse_nest(matroska, syntax->def.n, data))
return res;
break;
case EBML_STOP:
return 1;
skip:
default:
if (length) {
int64_t res2;
if (ffio_limit(pb, length) != length) {
// ffio_limit emits its own error message,
// so we don't have to.
return AVERROR(EIO);
}
if ((res2 = avio_skip(pb, length - 1)) >= 0) {
// avio_skip might take us past EOF. We check for this
// by skipping only length - 1 bytes, reading a byte and
// checking the error flags. This is done in order to check
// that the element has been properly skipped even when
// no filesize (that ffio_limit relies on) is available.
avio_r8(pb);
res = NEEDS_CHECKING;
} else
res = res2;
} else
res = 0;
}
if (res) {
if (res == NEEDS_CHECKING) {
if (pb->eof_reached) {
if (pb->error)
res = pb->error;
else
res = AVERROR_EOF;
} else
goto level_check;
}
if (res == AVERROR_INVALIDDATA)
av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
else if (res == AVERROR(EIO))
av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
else if (res == AVERROR_EOF) {
av_log(matroska->ctx, AV_LOG_ERROR, "File ended prematurely\n");
res = AVERROR(EIO);
}
return res;
}
level_check:
if (syntax->is_counted && data) {
CountedElement *elem = data;
if (elem->count != UINT_MAX)
elem->count++;
}
if (level_check == LEVEL_ENDED && matroska->num_levels) {
level = &matroska->levels[matroska->num_levels - 1];
pos = avio_tell(pb);
// Given that pos >= level->start no check for
// level->length != EBML_UNKNOWN_LENGTH is necessary.
while (matroska->num_levels && pos == level->start + level->length) {
matroska->num_levels--;
level--;
}
}
return level_check;
}
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_buffer_unref(&((EbmlBin *) data_off)->buf);
break;
case EBML_LEVEL1:
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_freep(&list->elem);
list->nb_elem = 0;
list->alloc_elem_size = 0;
} else
ebml_free(syntax[i].def.n, data_off);
default:
break;
}
}
}
/*
* Autodetecting...
*/
static int matroska_probe(const AVProbeData *p)
{
uint64_t total = 0;
int len_mask = 0x80, size = 1, n = 1, i;
/* EBML header? */
if (AV_RB32(p->buf) != EBML_ID_HEADER)
return 0;
/* length of header */
total = p->buf[4];
while (size <= 8 && !(total & len_mask)) {
size++;
len_mask >>= 1;
}
if (size > 8)
return 0;
total &= (len_mask - 1);
while (n < size)
total = (total << 8) | p->buf[4 + n++];
if (total + 1 == 1ULL << (7 * size)){
/* Unknown-length header - simply parse the whole buffer. */
total = p->buf_size - 4 - size;
} else {
/* Does the probe data contain the whole header? */
if (p->buf_size < 4 + size + total)
return 0;
}
/* The header should contain a known document type. For now,
* we don't parse the whole header but simply check for the
* availability of that array of characters inside the header.
* Not fully fool-proof, but good enough. */
for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
size_t probelen = strlen(matroska_doctypes[i]);
if (total < probelen)
continue;
for (n = 4 + size; n <= 4 + size + total - probelen; n++)
if (!memcmp(p->buf + n, matroska_doctypes[i], probelen))
return AVPROBE_SCORE_MAX;
}
// probably valid EBML header but no recognized doctype
return AVPROBE_SCORE_EXTENSION;
}
static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
uint64_t 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 %"PRIu64"\n", num);
return NULL;
}
static int matroska_decode_buffer(uint8_t **buf, int *buf_size,
MatroskaTrack *track)
{
MatroskaTrackEncoding *encodings = track->encodings.elem;
uint8_t *data = *buf;
int isize = *buf_size;
uint8_t *pkt_data = NULL;
uint8_t av_unused *newpktdata;
int pkt_size = isize;
int result = 0;
int olen;
if (pkt_size >= 10000000U)
return AVERROR_INVALIDDATA;
switch (encodings[0].compression.algo) {
case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
{
int header_size = encodings[0].compression.settings.size;
uint8_t *header = encodings[0].compression.settings.data;
if (header_size && !header) {
av_log(NULL, AV_LOG_ERROR, "Compression size but no data in headerstrip\n");
return -1;
}
if (!header_size)
return 0;
pkt_size = isize + header_size;
pkt_data = av_malloc(pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!pkt_data)
return AVERROR(ENOMEM);
memcpy(pkt_data, header, header_size);
memcpy(pkt_data + header_size, data, isize);
break;
}
#if CONFIG_LZO
case MATROSKA_TRACK_ENCODING_COMP_LZO:
do {
int insize = isize;
olen = pkt_size *= 3;
newpktdata = av_realloc(pkt_data, pkt_size + AV_LZO_OUTPUT_PADDING
+ AV_INPUT_BUFFER_PADDING_SIZE);
if (!newpktdata) {
result = AVERROR(ENOMEM);
goto failed;
}
pkt_data = newpktdata;
result = av_lzo1x_decode(pkt_data, &olen, data, &insize);
} while (result == AV_LZO_OUTPUT_FULL && pkt_size < 10000000);
if (result) {
result = AVERROR_INVALIDDATA;
goto failed;
}
pkt_size -= olen;
break;
#endif
#if CONFIG_ZLIB
case MATROSKA_TRACK_ENCODING_COMP_ZLIB:
{
z_stream zstream = { 0 };
if (inflateInit(&zstream) != Z_OK)
return -1;
zstream.next_in = data;
zstream.avail_in = isize;
do {
pkt_size *= 3;
newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!newpktdata) {
inflateEnd(&zstream);
result = AVERROR(ENOMEM);
goto failed;
}
pkt_data = newpktdata;
zstream.avail_out = pkt_size - zstream.total_out;
zstream.next_out = pkt_data + zstream.total_out;
result = inflate(&zstream, Z_NO_FLUSH);
} while (result == Z_OK && pkt_size < 10000000);
pkt_size = zstream.total_out;
inflateEnd(&zstream);
if (result != Z_STREAM_END) {
if (result == Z_MEM_ERROR)
result = AVERROR(ENOMEM);
else
result = AVERROR_INVALIDDATA;
goto failed;
}
break;
}
#endif
#if CONFIG_BZLIB
case MATROSKA_TRACK_ENCODING_COMP_BZLIB:
{
bz_stream bzstream = { 0 };
if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
return -1;
bzstream.next_in = data;
bzstream.avail_in = isize;
do {
pkt_size *= 3;
newpktdata = av_realloc(pkt_data, pkt_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!newpktdata) {
BZ2_bzDecompressEnd(&bzstream);
result = AVERROR(ENOMEM);
goto failed;
}
pkt_data = newpktdata;
bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
bzstream.next_out = pkt_data + bzstream.total_out_lo32;
result = BZ2_bzDecompress(&bzstream);
} while (result == BZ_OK && pkt_size < 10000000);
pkt_size = bzstream.total_out_lo32;
BZ2_bzDecompressEnd(&bzstream);
if (result != BZ_STREAM_END) {
if (result == BZ_MEM_ERROR)
result = AVERROR(ENOMEM);
else
result = AVERROR_INVALIDDATA;
goto failed;
}
break;
}
#endif
default:
return AVERROR_INVALIDDATA;
}
memset(pkt_data + pkt_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
*buf = pkt_data;
*buf_size = pkt_size;
return 0;
failed:
av_free(pkt_data);
return result;
}
static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
AVDictionary **metadata, char *prefix)
{
MatroskaTag *tags = list->elem;
char key[1024];
int i;
for (i = 0; i < list->nb_elem; i++) {
const char *lang = tags[i].lang &&
strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
if (!tags[i].name) {
av_log(s, AV_LOG_WARNING, "Skipping invalid tag with no TagName.\n");
continue;
}
if (prefix)
snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
else
av_strlcpy(key, tags[i].name, sizeof(key));
if (tags[i].def || !lang) {
av_dict_set(metadata, key, tags[i].string, 0);
if (tags[i].sub.nb_elem)
matroska_convert_tag(s, &tags[i].sub, metadata, key);
}
if (lang) {
av_strlcat(key, "-", sizeof(key));
av_strlcat(key, lang, sizeof(key));
av_dict_set(metadata, key, tags[i].string, 0);
if (tags[i].sub.nb_elem)
matroska_convert_tag(s, &tags[i].sub, metadata, key);
}
}
ff_metadata_conv(metadata, NULL, ff_mkv_metadata_conv);
}
static void matroska_convert_tags(AVFormatContext *s)
{
MatroskaDemuxContext *matroska = s->priv_data;
MatroskaTags *tags = matroska->tags.elem;
int i, j;
for (i = 0; i < matroska->tags.nb_elem; i++) {
if (tags[i].target.attachuid) {
MatroskaAttachment *attachment = matroska->attachments.elem;
int found = 0;
for (j = 0; j < matroska->attachments.nb_elem; j++) {
if (attachment[j].uid == tags[i].target.attachuid &&
attachment[j].stream) {
matroska_convert_tag(s, &tags[i].tag,
&attachment[j].stream->metadata, NULL);
found = 1;
}
}
if (!found) {
av_log(s, AV_LOG_WARNING,
"The tags at index %d refer to a "
"non-existent attachment %"PRId64".\n",
i, tags[i].target.attachuid);
}
} else if (tags[i].target.chapteruid) {
MatroskaChapter *chapter = matroska->chapters.elem;
int found = 0;
for (j = 0; j < matroska->chapters.nb_elem; j++) {
if (chapter[j].uid == tags[i].target.chapteruid &&
chapter[j].chapter) {
matroska_convert_tag(s, &tags[i].tag,
&chapter[j].chapter->metadata, NULL);
found = 1;
}
}
if (!found) {
av_log(s, AV_LOG_WARNING,
"The tags at index %d refer to a non-existent chapter "
"%"PRId64".\n",
i, tags[i].target.chapteruid);
}
} else if (tags[i].target.trackuid) {
MatroskaTrack *track = matroska->tracks.elem;
int found = 0;
for (j = 0; j < matroska->tracks.nb_elem; j++) {
if (track[j].uid == tags[i].target.trackuid &&
track[j].stream) {
matroska_convert_tag(s, &tags[i].tag,
&track[j].stream->metadata, NULL);
found = 1;
}
}
if (!found) {
av_log(s, AV_LOG_WARNING,
"The tags at index %d refer to a non-existent track "
"%"PRId64".\n",
i, tags[i].target.trackuid);
}
} else {
matroska_convert_tag(s, &tags[i].tag, &s->metadata,
tags[i].target.type);
}
}
}
static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
int64_t pos)
{
uint32_t saved_id = matroska->current_id;
int64_t before_pos = avio_tell(matroska->ctx->pb);
int ret = 0;
int ret2;
/* seek */
if (avio_seek(matroska->ctx->pb, pos, SEEK_SET) == pos) {
/* We don't want to lose our seekhead level, so we add
* a dummy. This is a crude hack. */
if (matroska->num_levels == EBML_MAX_DEPTH) {
av_log(matroska->ctx, AV_LOG_INFO,
"Max EBML element depth (%d) reached, "
"cannot parse further.\n", EBML_MAX_DEPTH);
ret = AVERROR_INVALIDDATA;
} else {
matroska->levels[matroska->num_levels] = (MatroskaLevel) { 0, EBML_UNKNOWN_LENGTH };
matroska->num_levels++;
matroska->current_id = 0;
ret = ebml_parse(matroska, matroska_segment, matroska);
if (ret == LEVEL_ENDED) {
/* This can only happen if the seek brought us beyond EOF. */
ret = AVERROR_EOF;
}
}
}
/* Seek back - notice that in all instances where this is used
* it is safe to set the level to 1. */
ret2 = matroska_reset_status(matroska, saved_id, before_pos);
if (ret >= 0)
ret = ret2;
return ret;
}
static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
{
EbmlList *seekhead_list = &matroska->seekhead;
int i;
// we should not do any seeking in the streaming case
if (!(matroska->ctx->pb->seekable & AVIO_SEEKABLE_NORMAL))
return;
for (i = 0; i < seekhead_list->nb_elem; i++) {
MatroskaSeekhead *seekheads = seekhead_list->elem;
uint32_t id = seekheads[i].id;
int64_t pos = seekheads[i].pos + matroska->segment_start;
MatroskaLevel1Element *elem;
if (id != seekheads[i].id || pos < matroska->segment_start)
continue;
elem = matroska_find_level1_elem(matroska, id, pos);
if (!elem || elem->parsed)
continue;
elem->pos = pos;
// defer cues parsing until we actually need cue data.
if (id == MATROSKA_ID_CUES)
continue;
if (matroska_parse_seekhead_entry(matroska, pos) < 0) {
// mark index as broken
matroska->cues_parsing_deferred = -1;
break;
}
elem->parsed = 1;
}
}
static void matroska_add_index_entries(MatroskaDemuxContext *matroska)
{
EbmlList *index_list;
MatroskaIndex *index;
uint64_t index_scale = 1;
int i, j;
if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
return;
index_list = &matroska->index;
index = index_list->elem;
if (index_list->nb_elem < 2)
return;
if (index[1].time > 1E14 / matroska->time_scale) {
av_log(matroska->ctx, AV_LOG_WARNING, "Dropping apparently-broken index.\n");
return;
}
for (i = 0; i < index_list->nb_elem; i++) {
EbmlList *pos_list = &index[i].pos;
MatroskaIndexPos *pos = pos_list->elem;
for (j = 0; j < pos_list->nb_elem; j++) {
MatroskaTrack *track = matroska_find_track_by_num(matroska,
pos[j].track);
if (track && track->stream)
av_add_index_entry(track->stream,
pos[j].pos + matroska->segment_start,
index[i].time / index_scale, 0, 0,
AVINDEX_KEYFRAME);
}
}
}
static void matroska_parse_cues(MatroskaDemuxContext *matroska) {
int i;
if (matroska->ctx->flags & AVFMT_FLAG_IGNIDX)
return;
for (i = 0; i < matroska->num_level1_elems; i++) {
MatroskaLevel1Element *elem = &matroska->level1_elems[i];
if (elem->id == MATROSKA_ID_CUES && !elem->parsed) {
if (matroska_parse_seekhead_entry(matroska, elem->pos) < 0)
matroska->cues_parsing_deferred = -1;
elem->parsed = 1;
break;
}
}
matroska_add_index_entries(matroska);
}
static int matroska_aac_profile(char *codec_id)
{
static const char *const aac_profiles[] = { "MAIN", "LC", "SSR" };
int profile;
for (profile = 0; profile < FF_ARRAY_ELEMS(aac_profiles); profile++)
if (strstr(codec_id, aac_profiles[profile]))
break;
return profile + 1;
}
static int matroska_aac_sri(int samplerate)
{
int sri;
for (sri = 0; sri < FF_ARRAY_ELEMS(avpriv_mpeg4audio_sample_rates); sri++)
if (avpriv_mpeg4audio_sample_rates[sri] == samplerate)
break;
return sri;
}
static void matroska_metadata_creation_time(AVDictionary **metadata, int64_t date_utc)
{
/* Convert to seconds and adjust by number of seconds between 2001-01-01 and Epoch */
avpriv_dict_set_timestamp(metadata, "creation_time", date_utc / 1000 + 978307200000000LL);
}
static int matroska_parse_flac(AVFormatContext *s,
MatroskaTrack *track,
int *offset)
{
AVStream *st = track->stream;
uint8_t *p = track->codec_priv.data;
int size = track->codec_priv.size;
if (size < 8 + FLAC_STREAMINFO_SIZE || p[4] & 0x7f) {
av_log(s, AV_LOG_WARNING, "Invalid FLAC private data\n");
track->codec_priv.size = 0;
return 0;
}
*offset = 8;
track->codec_priv.size = 8 + FLAC_STREAMINFO_SIZE;
p += track->codec_priv.size;
size -= track->codec_priv.size;
/* parse the remaining metadata blocks if present */
while (size >= 4) {
int block_last, block_type, block_size;
flac_parse_block_header(p, &block_last, &block_type, &block_size);
p += 4;
size -= 4;
if (block_size > size)
return 0;
/* check for the channel mask */
if (block_type == FLAC_METADATA_TYPE_VORBIS_COMMENT) {
AVDictionary *dict = NULL;
AVDictionaryEntry *chmask;
ff_vorbis_comment(s, &dict, p, block_size, 0);
chmask = av_dict_get(dict, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", NULL, 0);
if (chmask) {
uint64_t mask = strtol(chmask->value, NULL, 0);
if (!mask || mask & ~0x3ffffULL) {
av_log(s, AV_LOG_WARNING,
"Invalid value of WAVEFORMATEXTENSIBLE_CHANNEL_MASK\n");
} else
st->codecpar->channel_layout = mask;
}
av_dict_free(&dict);
}
p += block_size;
size -= block_size;
}
return 0;
}
static int mkv_field_order(MatroskaDemuxContext *matroska, int64_t field_order)
{
int minor, micro, bttb = 0;
/* workaround a bug in our Matroska muxer, introduced in version 57.36 alongside
* this function, and fixed in 57.52 */
if (matroska->muxingapp && sscanf(matroska->muxingapp, "Lavf57.%d.%d", &minor, &micro) == 2)
bttb = (minor >= 36 && minor <= 51 && micro >= 100);
switch (field_order) {
case MATROSKA_VIDEO_FIELDORDER_PROGRESSIVE:
return AV_FIELD_PROGRESSIVE;
case MATROSKA_VIDEO_FIELDORDER_UNDETERMINED:
return AV_FIELD_UNKNOWN;
case MATROSKA_VIDEO_FIELDORDER_TT:
return AV_FIELD_TT;
case MATROSKA_VIDEO_FIELDORDER_BB:
return AV_FIELD_BB;
case MATROSKA_VIDEO_FIELDORDER_BT:
return bttb ? AV_FIELD_TB : AV_FIELD_BT;
case MATROSKA_VIDEO_FIELDORDER_TB:
return bttb ? AV_FIELD_BT : AV_FIELD_TB;
default:
return AV_FIELD_UNKNOWN;
}
}
static void mkv_stereo_mode_display_mul(int stereo_mode,
int *h_width, int *h_height)
{
switch (stereo_mode) {
case MATROSKA_VIDEO_STEREOMODE_TYPE_MONO:
case MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_RL:
case MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR:
case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_RL:
case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR:
break;
case MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT:
case MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT:
case MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_RL:
case MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR:
*h_width = 2;
break;
case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTTOM_TOP:
case MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM:
case MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_RL:
case MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR:
*h_height = 2;
break;
}
}
static int mkv_parse_video_color(AVStream *st, const MatroskaTrack *track) {
const MatroskaTrackVideoColor *color = track->video.color.elem;
const MatroskaMasteringMeta *mastering_meta;
int has_mastering_primaries, has_mastering_luminance;
if (!track->video.color.nb_elem)
return 0;
mastering_meta = &color->mastering_meta;
// Mastering primaries are CIE 1931 coords, and must be > 0.
has_mastering_primaries =
mastering_meta->r_x > 0 && mastering_meta->r_y > 0 &&
mastering_meta->g_x > 0 && mastering_meta->g_y > 0 &&
mastering_meta->b_x > 0 && mastering_meta->b_y > 0 &&
mastering_meta->white_x > 0 && mastering_meta->white_y > 0;
has_mastering_luminance = mastering_meta->max_luminance >
mastering_meta->min_luminance.el.f &&
mastering_meta->min_luminance.el.f >= 0 &&
mastering_meta->min_luminance.count;
if (color->matrix_coefficients != AVCOL_SPC_RESERVED)
st->codecpar->color_space = color->matrix_coefficients;
if (color->primaries != AVCOL_PRI_RESERVED &&
color->primaries != AVCOL_PRI_RESERVED0)
st->codecpar->color_primaries = color->primaries;
if (color->transfer_characteristics != AVCOL_TRC_RESERVED &&
color->transfer_characteristics != AVCOL_TRC_RESERVED0)
st->codecpar->color_trc = color->transfer_characteristics;
if (color->range != AVCOL_RANGE_UNSPECIFIED &&
color->range <= AVCOL_RANGE_JPEG)
st->codecpar->color_range = color->range;
if (color->chroma_siting_horz != MATROSKA_COLOUR_CHROMASITINGHORZ_UNDETERMINED &&
color->chroma_siting_vert != MATROSKA_COLOUR_CHROMASITINGVERT_UNDETERMINED &&
color->chroma_siting_horz < MATROSKA_COLOUR_CHROMASITINGHORZ_NB &&
color->chroma_siting_vert < MATROSKA_COLOUR_CHROMASITINGVERT_NB) {
st->codecpar->chroma_location =
avcodec_chroma_pos_to_enum((color->chroma_siting_horz - 1) << 7,
(color->chroma_siting_vert - 1) << 7);
}
if (color->max_cll && color->max_fall) {
size_t size = 0;
int ret;
AVContentLightMetadata *metadata = av_content_light_metadata_alloc(&size);
if (!metadata)
return AVERROR(ENOMEM);
ret = av_stream_add_side_data(st, AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
(uint8_t *)metadata, size);
if (ret < 0) {
av_freep(&metadata);
return ret;
}
metadata->MaxCLL = color->max_cll;
metadata->MaxFALL = color->max_fall;
}
if (has_mastering_primaries || has_mastering_luminance) {
AVMasteringDisplayMetadata *metadata =
(AVMasteringDisplayMetadata*) av_stream_new_side_data(
st, AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
sizeof(AVMasteringDisplayMetadata));
if (!metadata) {
return AVERROR(ENOMEM);
}
memset(metadata, 0, sizeof(AVMasteringDisplayMetadata));
if (has_mastering_primaries) {
metadata->display_primaries[0][0] = av_d2q(mastering_meta->r_x, INT_MAX);
metadata->display_primaries[0][1] = av_d2q(mastering_meta->r_y, INT_MAX);
metadata->display_primaries[1][0] = av_d2q(mastering_meta->g_x, INT_MAX);
metadata->display_primaries[1][1] = av_d2q(mastering_meta->g_y, INT_MAX);
metadata->display_primaries[2][0] = av_d2q(mastering_meta->b_x, INT_MAX);
metadata->display_primaries[2][1] = av_d2q(mastering_meta->b_y, INT_MAX);
metadata->white_point[0] = av_d2q(mastering_meta->white_x, INT_MAX);
metadata->white_point[1] = av_d2q(mastering_meta->white_y, INT_MAX);
metadata->has_primaries = 1;
}
if (has_mastering_luminance) {
metadata->max_luminance = av_d2q(mastering_meta->max_luminance, INT_MAX);
metadata->min_luminance = av_d2q(mastering_meta->min_luminance.el.f, INT_MAX);
metadata->has_luminance = 1;
}
}
return 0;
}
static int mkv_parse_video_projection(AVStream *st, const MatroskaTrack *track,
void *logctx)
{
AVSphericalMapping *spherical;
const MatroskaTrackVideoProjection *mkv_projection = &track->video.projection;
const uint8_t *priv_data = mkv_projection->private.data;
enum AVSphericalProjection projection;
size_t spherical_size;
uint32_t l = 0, t = 0, r = 0, b = 0;
uint32_t padding = 0;
int ret;
if (mkv_projection->private.size && priv_data[0] != 0) {
av_log(logctx, AV_LOG_WARNING, "Unknown spherical metadata\n");
return 0;
}
switch (track->video.projection.type) {
case MATROSKA_VIDEO_PROJECTION_TYPE_EQUIRECTANGULAR:
if (track->video.projection.private.size == 20) {
t = AV_RB32(priv_data + 4);
b = AV_RB32(priv_data + 8);
l = AV_RB32(priv_data + 12);
r = AV_RB32(priv_data + 16);
if (b >= UINT_MAX - t || r >= UINT_MAX - l) {
av_log(logctx, AV_LOG_ERROR,
"Invalid bounding rectangle coordinates "
"%"PRIu32",%"PRIu32",%"PRIu32",%"PRIu32"\n",
l, t, r, b);
return AVERROR_INVALIDDATA;
}
} else if (track->video.projection.private.size != 0) {
av_log(logctx, AV_LOG_ERROR, "Unknown spherical metadata\n");
return AVERROR_INVALIDDATA;
}
if (l || t || r || b)
projection = AV_SPHERICAL_EQUIRECTANGULAR_TILE;
else
projection = AV_SPHERICAL_EQUIRECTANGULAR;
break;
case MATROSKA_VIDEO_PROJECTION_TYPE_CUBEMAP:
if (track->video.projection.private.size < 4) {
av_log(logctx, AV_LOG_ERROR, "Missing projection private properties\n");
return AVERROR_INVALIDDATA;
} else if (track->video.projection.private.size == 12) {
uint32_t layout = AV_RB32(priv_data + 4);
if (layout) {
av_log(logctx, AV_LOG_WARNING,
"Unknown spherical cubemap layout %"PRIu32"\n", layout);
return 0;
}
projection = AV_SPHERICAL_CUBEMAP;
padding = AV_RB32(priv_data + 8);
} else {
av_log(logctx, AV_LOG_ERROR, "Unknown spherical metadata\n");
return AVERROR_INVALIDDATA;
}
break;
case MATROSKA_VIDEO_PROJECTION_TYPE_RECTANGULAR:
/* No Spherical metadata */
return 0;
default:
av_log(logctx, AV_LOG_WARNING,
"Unknown spherical metadata type %"PRIu64"\n",
track->video.projection.type);
return 0;
}
spherical = av_spherical_alloc(&spherical_size);
if (!spherical)
return AVERROR(ENOMEM);
spherical->projection = projection;
spherical->yaw = (int32_t) (track->video.projection.yaw * (1 << 16));
spherical->pitch = (int32_t) (track->video.projection.pitch * (1 << 16));
spherical->roll = (int32_t) (track->video.projection.roll * (1 << 16));
spherical->padding = padding;
spherical->bound_left = l;
spherical->bound_top = t;
spherical->bound_right = r;
spherical->bound_bottom = b;
ret = av_stream_add_side_data(st, AV_PKT_DATA_SPHERICAL, (uint8_t *)spherical,
spherical_size);
if (ret < 0) {
av_freep(&spherical);
return ret;
}
return 0;
}
static int get_qt_codec(MatroskaTrack *track, uint32_t *fourcc, enum AVCodecID *codec_id)
{
const AVCodecTag *codec_tags;
codec_tags = track->type == MATROSKA_TRACK_TYPE_VIDEO ?
ff_codec_movvideo_tags : ff_codec_movaudio_tags;
/* Normalize noncompliant private data that starts with the fourcc
* by expanding/shifting the data by 4 bytes and storing the data
* size at the start. */
if (ff_codec_get_id(codec_tags, AV_RL32(track->codec_priv.data))) {
int ret = av_buffer_realloc(&track->codec_priv.buf,
track->codec_priv.size + 4 + AV_INPUT_BUFFER_PADDING_SIZE);
if (ret < 0)
return ret;
track->codec_priv.data = track->codec_priv.buf->data;
memmove(track->codec_priv.data + 4, track->codec_priv.data, track->codec_priv.size);
track->codec_priv.size += 4;
AV_WB32(track->codec_priv.data, track->codec_priv.size);
}
*fourcc = AV_RL32(track->codec_priv.data + 4);
*codec_id = ff_codec_get_id(codec_tags, *fourcc);
return 0;
}
static int matroska_parse_tracks(AVFormatContext *s)
{
MatroskaDemuxContext *matroska = s->priv_data;
MatroskaTrack *tracks = matroska->tracks.elem;
int i, j, ret;
int k;
for (i = 0; i < matroska->tracks.nb_elem; i++) {
MatroskaTrack *track = &tracks[i];
enum AVCodecID codec_id = AV_CODEC_ID_NONE;
EbmlList *encodings_list = &track->encodings;
MatroskaTrackEncoding *encodings = encodings_list->elem;
uint8_t *extradata = NULL;
int extradata_size = 0;
int extradata_offset = 0;
uint32_t fourcc = 0;
FFIOContext b;
AVStream *st;
FFStream *sti;
char* key_id_base64 = NULL;
int bit_depth = -1;
/* Apply some sanity checks. */
if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
track->type != MATROSKA_TRACK_TYPE_AUDIO &&
track->type != MATROSKA_TRACK_TYPE_SUBTITLE &&
track->type != MATROSKA_TRACK_TYPE_METADATA) {
av_log(matroska->ctx, AV_LOG_INFO,
"Unknown or unsupported track type %"PRIu64"\n",
track->type);
continue;
}
if (!track->codec_id)
continue;
if ( track->type == MATROSKA_TRACK_TYPE_AUDIO && track->codec_id[0] != 'A'
|| track->type == MATROSKA_TRACK_TYPE_VIDEO && track->codec_id[0] != 'V'
|| track->type == MATROSKA_TRACK_TYPE_SUBTITLE && track->codec_id[0] != 'D' && track->codec_id[0] != 'S'
|| track->type == MATROSKA_TRACK_TYPE_METADATA && track->codec_id[0] != 'D' && track->codec_id[0] != 'S'
) {
av_log(matroska->ctx, AV_LOG_INFO, "Inconsistent track type\n");
continue;
}
if (track->audio.samplerate < 0 || track->audio.samplerate > INT_MAX ||
isnan(track->audio.samplerate)) {
av_log(matroska->ctx, AV_LOG_WARNING,
"Invalid sample rate %f, defaulting to 8000 instead.\n",
track->audio.samplerate);
track->audio.samplerate = 8000;
}
if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
if (!track->default_duration && track->video.frame_rate > 0) {
double default_duration = 1000000000 / track->video.frame_rate;
if (default_duration > UINT64_MAX || default_duration < 0) {
av_log(matroska->ctx, AV_LOG_WARNING,
"Invalid frame rate %e. Cannot calculate default duration.\n",
track->video.frame_rate);
} else {
track->default_duration = default_duration;
}
}
if (track->video.display_width == -1)
track->video.display_width = track->video.pixel_width;
if (track->video.display_height == -1)
track->video.display_height = track->video.pixel_height;
if (track->video.color_space.size == 4)
fourcc = AV_RL32(track->video.color_space.data);
} else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
if (!track->audio.out_samplerate)
track->audio.out_samplerate = track->audio.samplerate;
}
if (encodings_list->nb_elem > 1) {
av_log(matroska->ctx, AV_LOG_ERROR,
"Multiple combined encodings not supported");
} else if (encodings_list->nb_elem == 1) {
if (encodings[0].type) {
if (encodings[0].encryption.key_id.size > 0) {
/* Save the encryption key id to be stored later as a
metadata tag. */
const int b64_size = AV_BASE64_SIZE(encodings[0].encryption.key_id.size);
key_id_base64 = av_malloc(b64_size);
if (key_id_base64 == NULL)
return AVERROR(ENOMEM);
av_base64_encode(key_id_base64, b64_size,
encodings[0].encryption.key_id.data,
encodings[0].encryption.key_id.size);
} else {
encodings[0].scope = 0;
av_log(matroska->ctx, AV_LOG_ERROR,
"Unsupported encoding type");
}
} else if (
#if CONFIG_ZLIB
encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
#endif
#if CONFIG_BZLIB
encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
#endif
#if CONFIG_LZO
encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO &&
#endif
encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP) {
encodings[0].scope = 0;
av_log(matroska->ctx, AV_LOG_ERROR,
"Unsupported encoding type");
} else if (track->codec_priv.size && encodings[0].scope & 2) {
uint8_t *codec_priv = track->codec_priv.data;
int ret = matroska_decode_buffer(&track->codec_priv.data,
&track->codec_priv.size,
track);
if (ret < 0) {
track->codec_priv.data = NULL;
track->codec_priv.size = 0;
av_log(matroska->ctx, AV_LOG_ERROR,
"Failed to decode codec private data\n");
}
if (codec_priv != track->codec_priv.data) {
av_buffer_unref(&track->codec_priv.buf);
if (track->codec_priv.data) {
track->codec_priv.buf = av_buffer_create(track->codec_priv.data,
track->codec_priv.size + AV_INPUT_BUFFER_PADDING_SIZE,
NULL, NULL, 0);
if (!track->codec_priv.buf) {
av_freep(&track->codec_priv.data);
track->codec_priv.size = 0;
return AVERROR(ENOMEM);
}
}
}
}
}
track->needs_decoding = encodings && !encodings[0].type &&
encodings[0].scope & 1 &&
(encodings[0].compression.algo !=
MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP ||
encodings[0].compression.settings.size);
for (j = 0; ff_mkv_codec_tags[j].id != AV_CODEC_ID_NONE; j++) {
if (av_strstart(track->codec_id, ff_mkv_codec_tags[j].str, NULL)) {
codec_id = ff_mkv_codec_tags[j].id;
break;
}
}
st = track->stream = avformat_new_stream(s, NULL);
if (!st) {
av_free(key_id_base64);
return AVERROR(ENOMEM);
}
sti = ffstream(st);
if (key_id_base64) {
/* export encryption key id as base64 metadata tag */
av_dict_set(&st->metadata, "enc_key_id", key_id_base64,
AV_DICT_DONT_STRDUP_VAL);
}
if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC") &&
track->codec_priv.size >= 40 &&
track->codec_priv.data) {
track->ms_compat = 1;
bit_depth = AV_RL16(track->codec_priv.data + 14);
fourcc = AV_RL32(track->codec_priv.data + 16);
codec_id = ff_codec_get_id(ff_codec_bmp_tags,
fourcc);
if (!codec_id)
codec_id = ff_codec_get_id(ff_codec_movvideo_tags,
fourcc);
extradata_offset = 40;
} else if (!strcmp(track->codec_id, "A_MS/ACM") &&
track->codec_priv.size >= 14 &&
track->codec_priv.data) {
int ret;
ffio_init_context(&b, track->codec_priv.data,
track->codec_priv.size,
0, NULL, NULL, NULL, NULL);
ret = ff_get_wav_header(s, &b.pub, st->codecpar,
track->codec_priv.size, 0);
if (ret < 0)
return ret;
codec_id = st->codecpar->codec_id;
fourcc = st->codecpar->codec_tag;
extradata_offset = FFMIN(track->codec_priv.size, 18);
} else if (!strcmp(track->codec_id, "A_QUICKTIME")
/* Normally 36, but allow noncompliant private data */
&& (track->codec_priv.size >= 32)
&& (track->codec_priv.data)) {
uint16_t sample_size;
int ret = get_qt_codec(track, &fourcc, &codec_id);
if (ret < 0)
return ret;
sample_size = AV_RB16(track->codec_priv.data + 26);
if (fourcc == 0) {
if (sample_size == 8) {
fourcc = MKTAG('r','a','w',' ');
codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
} else if (sample_size == 16) {
fourcc = MKTAG('t','w','o','s');
codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
}
}
if ((fourcc == MKTAG('t','w','o','s') ||
fourcc == MKTAG('s','o','w','t')) &&
sample_size == 8)
codec_id = AV_CODEC_ID_PCM_S8;
} else if (!strcmp(track->codec_id, "V_QUICKTIME") &&
(track->codec_priv.size >= 21) &&
(track->codec_priv.data)) {
int ret = get_qt_codec(track, &fourcc, &codec_id);
if (ret < 0)
return ret;
if (codec_id == AV_CODEC_ID_NONE && AV_RL32(track->codec_priv.data+4) == AV_RL32("SMI ")) {
fourcc = MKTAG('S','V','Q','3');
codec_id = ff_codec_get_id(ff_codec_movvideo_tags, fourcc);
}
if (codec_id == AV_CODEC_ID_NONE)
av_log(matroska->ctx, AV_LOG_ERROR,
"mov FourCC not found %s.\n", av_fourcc2str(fourcc));
if (track->codec_priv.size >= 86) {
bit_depth = AV_RB16(track->codec_priv.data + 82);
ffio_init_context(&b, track->codec_priv.data,
track->codec_priv.size,
0, NULL, NULL, NULL, NULL);
if (ff_get_qtpalette(codec_id, &b.pub, track->palette)) {
bit_depth &= 0x1F;
track->has_palette = 1;
}
}
} else if (codec_id == AV_CODEC_ID_PCM_S16BE) {
switch (track->audio.bitdepth) {
case 8:
codec_id = AV_CODEC_ID_PCM_U8;
break;
case 24:
codec_id = AV_CODEC_ID_PCM_S24BE;
break;
case 32:
codec_id = AV_CODEC_ID_PCM_S32BE;
break;
}
} else if (codec_id == AV_CODEC_ID_PCM_S16LE) {
switch (track->audio.bitdepth) {
case 8:
codec_id = AV_CODEC_ID_PCM_U8;
break;
case 24:
codec_id = AV_CODEC_ID_PCM_S24LE;
break;
case 32:
codec_id = AV_CODEC_ID_PCM_S32LE;
break;
}
} else if (codec_id == AV_CODEC_ID_PCM_F32LE &&
track->audio.bitdepth == 64) {
codec_id = AV_CODEC_ID_PCM_F64LE;
} else if (codec_id == AV_CODEC_ID_AAC && !track->codec_priv.size) {
int profile = matroska_aac_profile(track->codec_id);
int sri = matroska_aac_sri(track->audio.samplerate);
extradata = av_mallocz(5 + AV_INPUT_BUFFER_PADDING_SIZE);
if (!extradata)
return AVERROR(ENOMEM);
extradata[0] = (profile << 3) | ((sri & 0x0E) >> 1);
extradata[1] = ((sri & 0x01) << 7) | (track->audio.channels << 3);
if (strstr(track->codec_id, "SBR")) {
sri = matroska_aac_sri(track->audio.out_samplerate);
extradata[2] = 0x56;
extradata[3] = 0xE5;
extradata[4] = 0x80 | (sri << 3);
extradata_size = 5;
} else
extradata_size = 2;
} else if (codec_id == AV_CODEC_ID_ALAC && track->codec_priv.size && track->codec_priv.size < INT_MAX - 12 - AV_INPUT_BUFFER_PADDING_SIZE) {
/* Only ALAC's magic cookie is stored in Matroska's track headers.
* Create the "atom size", "tag", and "tag version" fields the
* decoder expects manually. */
extradata_size = 12 + track->codec_priv.size;
extradata = av_mallocz(extradata_size +
AV_INPUT_BUFFER_PADDING_SIZE);
if (!extradata)
return AVERROR(ENOMEM);
AV_WB32(extradata, extradata_size);
memcpy(&extradata[4], "alac", 4);
AV_WB32(&extradata[8], 0);
memcpy(&extradata[12], track->codec_priv.data,
track->codec_priv.size);
} else if (codec_id == AV_CODEC_ID_TTA) {
uint8_t *ptr;
if (track->audio.channels > UINT16_MAX ||
track->audio.bitdepth > UINT16_MAX) {
av_log(matroska->ctx, AV_LOG_WARNING,
"Too large audio channel number %"PRIu64
" or bitdepth %"PRIu64". Skipping track.\n",
track->audio.channels, track->audio.bitdepth);
if (matroska->ctx->error_recognition & AV_EF_EXPLODE)
return AVERROR_INVALIDDATA;
else
continue;
}
if (track->audio.out_samplerate < 0 || track->audio.out_samplerate > INT_MAX)
return AVERROR_INVALIDDATA;
extradata_size = 22;
extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!extradata)
return AVERROR(ENOMEM);
ptr = extradata;
bytestream_put_be32(&ptr, AV_RB32("TTA1"));
bytestream_put_le16(&ptr, 1);
bytestream_put_le16(&ptr, track->audio.channels);
bytestream_put_le16(&ptr, track->audio.bitdepth);
bytestream_put_le32(&ptr, track->audio.out_samplerate);
bytestream_put_le32(&ptr, av_rescale(matroska->duration * matroska->time_scale,
track->audio.out_samplerate,
AV_TIME_BASE * 1000));
} else if (codec_id == AV_CODEC_ID_RV10 ||
codec_id == AV_CODEC_ID_RV20 ||
codec_id == AV_CODEC_ID_RV30 ||
codec_id == AV_CODEC_ID_RV40) {
extradata_offset = 26;
} else if (codec_id == AV_CODEC_ID_RA_144) {
track->audio.out_samplerate = 8000;
track->audio.channels = 1;
} else if ((codec_id == AV_CODEC_ID_RA_288 ||
codec_id == AV_CODEC_ID_COOK ||
codec_id == AV_CODEC_ID_ATRAC3 ||
codec_id == AV_CODEC_ID_SIPR)
&& track->codec_priv.data) {
const uint8_t *ptr = track->codec_priv.data;
int flavor;
if (track->codec_priv.size < 46)
return AVERROR_INVALIDDATA;
ptr += 22;
flavor = bytestream_get_be16(&ptr);
track->audio.coded_framesize = bytestream_get_be32(&ptr);
ptr += 12;
track->audio.sub_packet_h = bytestream_get_be16(&ptr);
track->audio.frame_size = bytestream_get_be16(&ptr);
track->audio.sub_packet_size = bytestream_get_be16(&ptr);
if (track->audio.coded_framesize <= 0 ||
track->audio.sub_packet_h <= 0 ||
track->audio.frame_size <= 0)
return AVERROR_INVALIDDATA;
if (codec_id == AV_CODEC_ID_RA_288) {
if (track->audio.sub_packet_h & 1 || 2 * track->audio.frame_size
!= (int64_t)track->audio.sub_packet_h * track->audio.coded_framesize)
return AVERROR_INVALIDDATA;
st->codecpar->block_align = track->audio.coded_framesize;
track->codec_priv.size = 0;
} else {
if (codec_id == AV_CODEC_ID_SIPR) {
static const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
if (flavor > 3)
return AVERROR_INVALIDDATA;
track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
st->codecpar->bit_rate = sipr_bit_rate[flavor];
} else if (track->audio.sub_packet_size <= 0 ||
track->audio.frame_size % track->audio.sub_packet_size)
return AVERROR_INVALIDDATA;
st->codecpar->block_align = track->audio.sub_packet_size;
extradata_offset = 78;
}
track->audio.buf = av_malloc_array(track->audio.sub_packet_h,
track->audio.frame_size);
if (!track->audio.buf)
return AVERROR(ENOMEM);
} else if (codec_id == AV_CODEC_ID_FLAC && track->codec_priv.size) {
ret = matroska_parse_flac(s, track, &extradata_offset);
if (ret < 0)
return ret;
} else if (codec_id == AV_CODEC_ID_WAVPACK && track->codec_priv.size < 2) {
av_log(matroska->ctx, AV_LOG_INFO, "Assuming WavPack version 4.10 "
"in absence of valid CodecPrivate.\n");
extradata_size = 2;
extradata = av_mallocz(2 + AV_INPUT_BUFFER_PADDING_SIZE);
if (!extradata)
return AVERROR(ENOMEM);
AV_WL16(extradata, 0x410);
} else if (codec_id == AV_CODEC_ID_PRORES && track->codec_priv.size == 4) {
fourcc = AV_RL32(track->codec_priv.data);
} else if (codec_id == AV_CODEC_ID_VP9 && track->codec_priv.size) {
/* we don't need any value stored in CodecPrivate.
make sure that it's not exported as extradata. */
track->codec_priv.size = 0;
}
track->codec_priv.size -= extradata_offset;
if (codec_id == AV_CODEC_ID_NONE)
av_log(matroska->ctx, AV_LOG_INFO,
"Unknown/unsupported AVCodecID %s.\n", track->codec_id);
if (track->time_scale < 0.01) {
av_log(matroska->ctx, AV_LOG_WARNING,
"Track TimestampScale too small %f, assuming 1.0.\n",
track->time_scale);
track->time_scale = 1.0;
}
avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
1000 * 1000 * 1000); /* 64 bit pts in ns */
/* convert the delay from ns to the track timebase */
track->codec_delay_in_track_tb = av_rescale_q(track->codec_delay,
(AVRational){ 1, 1000000000 },
st->time_base);
st->codecpar->codec_id = codec_id;
if (strcmp(track->language, "und"))
av_dict_set(&st->metadata, "language", track->language, 0);
av_dict_set(&st->metadata, "title", track->name, 0);
if (track->flag_default)
st->disposition |= AV_DISPOSITION_DEFAULT;
if (track->flag_forced)
st->disposition |= AV_DISPOSITION_FORCED;
if (track->flag_comment)
st->disposition |= AV_DISPOSITION_COMMENT;
if (track->flag_hearingimpaired)
st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
if (track->flag_visualimpaired)
st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
if (track->flag_original.count > 0)
st->disposition |= track->flag_original.el.u ? AV_DISPOSITION_ORIGINAL
: AV_DISPOSITION_DUB;
if (!st->codecpar->extradata) {
if (extradata) {
st->codecpar->extradata = extradata;
st->codecpar->extradata_size = extradata_size;
} else if (track->codec_priv.data && track->codec_priv.size > 0) {
if (ff_alloc_extradata(st->codecpar, track->codec_priv.size))
return AVERROR(ENOMEM);
memcpy(st->codecpar->extradata,
track->codec_priv.data + extradata_offset,
track->codec_priv.size);
}
}
if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
MatroskaTrackPlane *planes = track->operation.combine_planes.elem;
int display_width_mul = 1;
int display_height_mul = 1;
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_tag = fourcc;
if (bit_depth >= 0)
st->codecpar->bits_per_coded_sample = bit_depth;
st->codecpar->width = track->video.pixel_width;
st->codecpar->height = track->video.pixel_height;
if (track->video.interlaced == MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED)
st->codecpar->field_order = mkv_field_order(matroska, track->video.field_order);
else if (track->video.interlaced == MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE)
st->codecpar->field_order = AV_FIELD_PROGRESSIVE;
if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
mkv_stereo_mode_display_mul(track->video.stereo_mode, &display_width_mul, &display_height_mul);
if (track->video.display_unit < MATROSKA_VIDEO_DISPLAYUNIT_UNKNOWN) {
av_reduce(&st->sample_aspect_ratio.num,
&st->sample_aspect_ratio.den,
st->codecpar->height * track->video.display_width * display_width_mul,
st->codecpar->width * track->video.display_height * display_height_mul,
INT_MAX);
}
if (st->codecpar->codec_id != AV_CODEC_ID_HEVC)
sti->need_parsing = AVSTREAM_PARSE_HEADERS;
if (track->default_duration) {
int div = track->default_duration <= INT64_MAX ? 1 : 2;
av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
1000000000 / div, track->default_duration / div, 30000);
#if FF_API_R_FRAME_RATE
if ( st->avg_frame_rate.num < st->avg_frame_rate.den * 1000LL
&& st->avg_frame_rate.num > st->avg_frame_rate.den * 5LL)
st->r_frame_rate = st->avg_frame_rate;
#endif
}
/* export stereo mode flag as metadata tag */
if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
av_dict_set(&st->metadata, "stereo_mode", ff_matroska_video_stereo_mode[track->video.stereo_mode], 0);
/* export alpha mode flag as metadata tag */
if (track->video.alpha_mode)
av_dict_set(&st->metadata, "alpha_mode", "1", 0);
/* if we have virtual track, mark the real tracks */
for (j=0; j < track->operation.combine_planes.nb_elem; j++) {
char buf[32];
if (planes[j].type >= MATROSKA_VIDEO_STEREO_PLANE_COUNT)
continue;
snprintf(buf, sizeof(buf), "%s_%d",
ff_matroska_video_stereo_plane[planes[j].type], i);
for (k=0; k < matroska->tracks.nb_elem; k++)
if (planes[j].uid == tracks[k].uid && tracks[k].stream) {
av_dict_set(&tracks[k].stream->metadata,
"stereo_mode", buf, 0);
break;
}
}
// add stream level stereo3d side data if it is a supported format
if (track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
track->video.stereo_mode != 10 && track->video.stereo_mode != 12) {
int ret = ff_mkv_stereo3d_conv(st, track->video.stereo_mode);
if (ret < 0)
return ret;
}
ret = mkv_parse_video_color(st, track);
if (ret < 0)
return ret;
ret = mkv_parse_video_projection(st, track, matroska->ctx);
if (ret < 0)
return ret;
} else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_tag = fourcc;
st->codecpar->sample_rate = track->audio.out_samplerate;
st->codecpar->channels = track->audio.channels;
if (!st->codecpar->bits_per_coded_sample)
st->codecpar->bits_per_coded_sample = track->audio.bitdepth;
if (st->codecpar->codec_id == AV_CODEC_ID_MP3 ||
st->codecpar->codec_id == AV_CODEC_ID_MLP ||
st->codecpar->codec_id == AV_CODEC_ID_TRUEHD)
sti->need_parsing = AVSTREAM_PARSE_FULL;
else if (st->codecpar->codec_id != AV_CODEC_ID_AAC)
sti->need_parsing = AVSTREAM_PARSE_HEADERS;
if (track->codec_delay > 0) {
st->codecpar->initial_padding = av_rescale_q(track->codec_delay,
(AVRational){1, 1000000000},
(AVRational){1, st->codecpar->codec_id == AV_CODEC_ID_OPUS ?
48000 : st->codecpar->sample_rate});
}
if (track->seek_preroll > 0) {
st->codecpar->seek_preroll = av_rescale_q(track->seek_preroll,
(AVRational){1, 1000000000},
(AVRational){1, st->codecpar->sample_rate});
}
} else if (codec_id == AV_CODEC_ID_WEBVTT) {
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
if (!strcmp(track->codec_id, "D_WEBVTT/CAPTIONS")) {
st->disposition |= AV_DISPOSITION_CAPTIONS;
} else if (!strcmp(track->codec_id, "D_WEBVTT/DESCRIPTIONS")) {
st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
} else if (!strcmp(track->codec_id, "D_WEBVTT/METADATA")) {
st->disposition |= AV_DISPOSITION_METADATA;
}
} else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
if (track->flag_textdescriptions)
st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
}
}
return 0;
}
static int matroska_read_header(AVFormatContext *s)
{
FFFormatContext *const si = ffformatcontext(s);
MatroskaDemuxContext *matroska = s->priv_data;
EbmlList *attachments_list = &matroska->attachments;
EbmlList *chapters_list = &matroska->chapters;
MatroskaAttachment *attachments;
MatroskaChapter *chapters;
uint64_t max_start = 0;
int64_t pos;
Ebml ebml = { 0 };
int i, j, res;
matroska->ctx = s;
matroska->cues_parsing_deferred = 1;
/* First read the EBML header. */
if (ebml_parse(matroska, ebml_syntax, &ebml) || !ebml.doctype) {
av_log(matroska->ctx, AV_LOG_ERROR, "EBML header parsing failed\n");
ebml_free(ebml_syntax, &ebml);
return AVERROR_INVALIDDATA;
}
if (ebml.version > EBML_VERSION ||
ebml.max_size > sizeof(uint64_t) ||
ebml.id_length > sizeof(uint32_t) ||
ebml.doctype_version > 3) {
avpriv_report_missing_feature(matroska->ctx,
"EBML version %"PRIu64", doctype %s, doc version %"PRIu64,
ebml.version, ebml.doctype, ebml.doctype_version);
ebml_free(ebml_syntax, &ebml);
return AVERROR_PATCHWELCOME;
} else if (ebml.doctype_version == 3) {
av_log(matroska->ctx, AV_LOG_WARNING,
"EBML header using unsupported features\n"
"(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
ebml.version, ebml.doctype, ebml.doctype_version);
}
for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
if (!strcmp(ebml.doctype, matroska_doctypes[i]))
break;
if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
if (matroska->ctx->error_recognition & AV_EF_EXPLODE) {
ebml_free(ebml_syntax, &ebml);
return AVERROR_INVALIDDATA;
}
}
ebml_free(ebml_syntax, &ebml);
matroska->pkt = si->parse_pkt;
/* The next thing is a segment. */
pos = avio_tell(matroska->ctx->pb);
res = ebml_parse(matroska, matroska_segments, matroska);
// Try resyncing until we find an EBML_STOP type element.
while (res != 1) {
res = matroska_resync(matroska, pos);
if (res < 0)
return res;
pos = avio_tell(matroska->ctx->pb);
res = ebml_parse(matroska, matroska_segment, matroska);
if (res == AVERROR(EIO)) // EOF is translated to EIO, this exists the loop on EOF
return res;
}
/* Set data_offset as it might be needed later by seek_frame_generic. */
if (matroska->current_id == MATROSKA_ID_CLUSTER)
si->data_offset = avio_tell(matroska->ctx->pb) - 4;
matroska_execute_seekhead(matroska);
if (!matroska->time_scale)
matroska->time_scale = 1000000;
if (matroska->duration)
matroska->ctx->duration = matroska->duration * matroska->