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ffmpeg / libavformat / matroskadec.c @ 9bcb92ca

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/*
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 * Matroska file demuxer (no muxer yet)
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 * Copyright (c) 2003-2004 The ffmpeg Project
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file matroskadec.c
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 * Matroska file demuxer
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 * by Ronald Bultje <rbultje@ronald.bitfreak.net>
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 * with a little help from Moritz Bunkus <moritz@bunkus.org>
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 * Specs available on the matroska project page:
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 * http://www.matroska.org/.
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 */
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#include "avformat.h"
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/* For codec_get_id(). */
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#include "riff.h"
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#include "isom.h"
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#include "matroska.h"
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#include "libavcodec/mpeg4audio.h"
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#include "libavutil/intfloat_readwrite.h"
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#include "libavutil/avstring.h"
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#include "libavutil/lzo.h"
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#ifdef CONFIG_ZLIB
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#include <zlib.h>
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#endif
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#ifdef CONFIG_BZLIB
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#include <bzlib.h>
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#endif
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typedef enum {
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    EBML_NONE,
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    EBML_UINT,
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    EBML_FLOAT,
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    EBML_STR,
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    EBML_UTF8,
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    EBML_BIN,
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    EBML_NEST,
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    EBML_PASS,
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    EBML_STOP,
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} EbmlType;
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typedef const struct EbmlSyntax {
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    uint32_t id;
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    EbmlType type;
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    int list_elem_size;
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    int data_offset;
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    union {
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        uint64_t    u;
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        double      f;
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        const char *s;
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        const struct EbmlSyntax *n;
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    } def;
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} EbmlSyntax;
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typedef struct {
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    int nb_elem;
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    void *elem;
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} EbmlList;
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typedef struct {
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    int      size;
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    uint8_t *data;
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    int64_t  pos;
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} EbmlBin;
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typedef struct {
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    uint64_t version;
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    uint64_t max_size;
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    uint64_t id_length;
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    char    *doctype;
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    uint64_t doctype_version;
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} Ebml;
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typedef struct {
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    uint64_t algo;
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    EbmlBin  settings;
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} MatroskaTrackCompression;
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typedef struct {
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    uint64_t scope;
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    uint64_t type;
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    MatroskaTrackCompression compression;
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} MatroskaTrackEncoding;
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typedef struct {
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    double   frame_rate;
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    uint64_t display_width;
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    uint64_t display_height;
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    uint64_t pixel_width;
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    uint64_t pixel_height;
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    uint64_t fourcc;
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} MatroskaTrackVideo;
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typedef struct {
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    double   samplerate;
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    double   out_samplerate;
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    uint64_t bitdepth;
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    uint64_t channels;
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    /* real audio header (extracted from extradata) */
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    int      coded_framesize;
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    int      sub_packet_h;
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    int      frame_size;
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    int      sub_packet_size;
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    int      sub_packet_cnt;
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    int      pkt_cnt;
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    uint8_t *buf;
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} MatroskaTrackAudio;
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typedef struct {
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    uint64_t num;
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    uint64_t type;
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    char    *codec_id;
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    EbmlBin  codec_priv;
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    char    *language;
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    double time_scale;
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    uint64_t default_duration;
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    uint64_t flag_default;
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    MatroskaTrackVideo video;
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    MatroskaTrackAudio audio;
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    EbmlList encodings;
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    AVStream *stream;
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} MatroskaTrack;
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typedef struct {
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    char *filename;
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    char *mime;
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    EbmlBin bin;
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} MatroskaAttachement;
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typedef struct {
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    uint64_t start;
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    uint64_t end;
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    uint64_t uid;
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    char    *title;
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} MatroskaChapter;
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typedef struct {
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    uint64_t track;
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    uint64_t pos;
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} MatroskaIndexPos;
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typedef struct {
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    uint64_t time;
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    EbmlList pos;
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} MatroskaIndex;
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typedef struct {
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    uint64_t id;
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    uint64_t pos;
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} MatroskaSeekhead;
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typedef struct {
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    uint64_t start;
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    uint64_t length;
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} MatroskaLevel;
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typedef struct {
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    AVFormatContext *ctx;
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    /* ebml stuff */
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    int num_levels;
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    MatroskaLevel levels[EBML_MAX_DEPTH];
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    int level_up;
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    uint64_t time_scale;
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    double   duration;
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    char    *title;
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    EbmlList tracks;
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    EbmlList attachments;
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    EbmlList chapters;
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    EbmlList index;
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    EbmlList seekhead;
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    /* num_streams is the number of streams that av_new_stream() was called
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     * for ( = that are available to the calling program). */
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    int num_streams;
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    /* cache for ID peeking */
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    uint32_t peek_id;
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    /* byte position of the segment inside the stream */
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    offset_t segment_start;
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    /* The packet queue. */
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    AVPacket **packets;
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    int num_packets;
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    int done;
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    int has_cluster_id;
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    /* What to skip before effectively reading a packet. */
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    int skip_to_keyframe;
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    AVStream *skip_to_stream;
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} MatroskaDemuxContext;
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typedef struct {
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    uint64_t duration;
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    int64_t  reference;
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    EbmlBin  bin;
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} MatroskaBlock;
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typedef struct {
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    uint64_t timecode;
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    EbmlList blocks;
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} MatroskaCluster;
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#define ARRAY_SIZE(x)  (sizeof(x)/sizeof(*x))
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static EbmlSyntax ebml_header[] = {
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    { EBML_ID_EBMLREADVERSION,        EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
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    { EBML_ID_EBMLMAXSIZELENGTH,      EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
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    { EBML_ID_EBMLMAXIDLENGTH,        EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
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    { EBML_ID_DOCTYPE,                EBML_STR,  0, offsetof(Ebml,doctype), {.s="(none)"} },
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    { EBML_ID_DOCTYPEREADVERSION,     EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
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    { EBML_ID_EBMLVERSION,            EBML_NONE },
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    { EBML_ID_DOCTYPEVERSION,         EBML_NONE },
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    { EBML_ID_VOID,                   EBML_NONE },
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    { 0 }
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};
239

    
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static EbmlSyntax ebml_syntax[] = {
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    { EBML_ID_HEADER,                 EBML_NEST, 0, 0, {.n=ebml_header} },
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    { 0 }
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};
244

    
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static EbmlSyntax matroska_info[] = {
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    { MATROSKA_ID_TIMECODESCALE,      EBML_UINT,  0, offsetof(MatroskaDemuxContext,time_scale), {.u=1000000} },
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    { MATROSKA_ID_DURATION,           EBML_FLOAT, 0, offsetof(MatroskaDemuxContext,duration) },
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    { MATROSKA_ID_TITLE,              EBML_UTF8,  0, offsetof(MatroskaDemuxContext,title) },
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    { MATROSKA_ID_WRITINGAPP,         EBML_NONE },
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    { MATROSKA_ID_MUXINGAPP,          EBML_NONE },
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    { MATROSKA_ID_DATEUTC,            EBML_NONE },
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    { MATROSKA_ID_SEGMENTUID,         EBML_NONE },
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    { EBML_ID_VOID,                   EBML_NONE },
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    { 0 }
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};
256

    
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static EbmlSyntax matroska_track_video[] = {
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    { MATROSKA_ID_VIDEOFRAMERATE,     EBML_FLOAT,0, offsetof(MatroskaTrackVideo,frame_rate) },
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    { MATROSKA_ID_VIDEODISPLAYWIDTH,  EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_width) },
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    { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_height) },
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    { MATROSKA_ID_VIDEOPIXELWIDTH,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_width) },
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    { MATROSKA_ID_VIDEOPIXELHEIGHT,   EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_height) },
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    { MATROSKA_ID_VIDEOCOLORSPACE,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,fourcc) },
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    { MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
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    { MATROSKA_ID_VIDEOSTEREOMODE,    EBML_NONE },
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    { MATROSKA_ID_VIDEOASPECTRATIO,   EBML_NONE },
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    { EBML_ID_VOID,                   EBML_NONE },
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    { 0 }
269
};
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static EbmlSyntax matroska_track_audio[] = {
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    { MATROSKA_ID_AUDIOSAMPLINGFREQ,  EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
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    { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
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    { MATROSKA_ID_AUDIOBITDEPTH,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
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    { MATROSKA_ID_AUDIOCHANNELS,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
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    { EBML_ID_VOID,                   EBML_NONE },
277
    { 0 }
278
};
279

    
280
static EbmlSyntax matroska_track_encoding_compression[] = {
281
    { MATROSKA_ID_ENCODINGCOMPALGO,   EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
282
    { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
283
    { EBML_ID_VOID,                   EBML_NONE },
284
    { 0 }
285
};
286

    
287
static EbmlSyntax matroska_track_encoding[] = {
288
    { MATROSKA_ID_ENCODINGSCOPE,      EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
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    { MATROSKA_ID_ENCODINGTYPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
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    { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
291
    { EBML_ID_VOID,                   EBML_NONE },
292
    { 0 }
293
};
294

    
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static EbmlSyntax matroska_track_encodings[] = {
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    { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
297
    { EBML_ID_VOID,                   EBML_NONE },
298
    { 0 }
299
};
300

    
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static EbmlSyntax matroska_track[] = {
302
    { MATROSKA_ID_TRACKNUMBER,          EBML_UINT, 0, offsetof(MatroskaTrack,num) },
303
    { MATROSKA_ID_TRACKTYPE,            EBML_UINT, 0, offsetof(MatroskaTrack,type) },
304
    { MATROSKA_ID_CODECID,              EBML_STR,  0, offsetof(MatroskaTrack,codec_id) },
305
    { MATROSKA_ID_CODECPRIVATE,         EBML_BIN,  0, offsetof(MatroskaTrack,codec_priv) },
306
    { MATROSKA_ID_TRACKLANGUAGE,        EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
307
    { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
308
    { MATROSKA_ID_TRACKTIMECODESCALE,   EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
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    { MATROSKA_ID_TRACKFLAGDEFAULT,     EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
310
    { MATROSKA_ID_TRACKVIDEO,           EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
311
    { MATROSKA_ID_TRACKAUDIO,           EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
312
    { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
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    { MATROSKA_ID_TRACKUID,             EBML_NONE },
314
    { MATROSKA_ID_TRACKNAME,            EBML_NONE },
315
    { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
316
    { MATROSKA_ID_TRACKFLAGFORCED,      EBML_NONE },
317
    { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
318
    { MATROSKA_ID_CODECNAME,            EBML_NONE },
319
    { MATROSKA_ID_CODECDECODEALL,       EBML_NONE },
320
    { MATROSKA_ID_CODECINFOURL,         EBML_NONE },
321
    { MATROSKA_ID_CODECDOWNLOADURL,     EBML_NONE },
322
    { MATROSKA_ID_TRACKMINCACHE,        EBML_NONE },
323
    { MATROSKA_ID_TRACKMAXCACHE,        EBML_NONE },
324
    { EBML_ID_VOID,                     EBML_NONE },
325
    { 0 }
326
};
327

    
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static EbmlSyntax matroska_tracks[] = {
329
    { MATROSKA_ID_TRACKENTRY,         EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
330
    { EBML_ID_VOID,                   EBML_NONE },
331
    { 0 }
332
};
333

    
334
static EbmlSyntax matroska_attachment[] = {
335
    { MATROSKA_ID_FILENAME,           EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
336
    { MATROSKA_ID_FILEMIMETYPE,       EBML_STR,  0, offsetof(MatroskaAttachement,mime) },
337
    { MATROSKA_ID_FILEDATA,           EBML_BIN,  0, offsetof(MatroskaAttachement,bin) },
338
    { MATROSKA_ID_FILEUID,            EBML_NONE },
339
    { EBML_ID_VOID,                   EBML_NONE },
340
    { 0 }
341
};
342

    
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static EbmlSyntax matroska_attachments[] = {
344
    { MATROSKA_ID_ATTACHEDFILE,       EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
345
    { EBML_ID_VOID,                   EBML_NONE },
346
    { 0 }
347
};
348

    
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static EbmlSyntax matroska_chapter_display[] = {
350
    { MATROSKA_ID_CHAPSTRING,         EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
351
    { EBML_ID_VOID,                   EBML_NONE },
352
    { 0 }
353
};
354

    
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static EbmlSyntax matroska_chapter_entry[] = {
356
    { MATROSKA_ID_CHAPTERTIMESTART,   EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
357
    { MATROSKA_ID_CHAPTERTIMEEND,     EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
358
    { MATROSKA_ID_CHAPTERUID,         EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
359
    { MATROSKA_ID_CHAPTERDISPLAY,     EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
360
    { MATROSKA_ID_CHAPTERFLAGHIDDEN,  EBML_NONE },
361
    { EBML_ID_VOID,                   EBML_NONE },
362
    { 0 }
363
};
364

    
365
static EbmlSyntax matroska_chapter[] = {
366
    { MATROSKA_ID_CHAPTERATOM,        EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
367
    { MATROSKA_ID_EDITIONUID,         EBML_NONE },
368
    { MATROSKA_ID_EDITIONFLAGHIDDEN,  EBML_NONE },
369
    { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
370
    { EBML_ID_VOID,                   EBML_NONE },
371
    { 0 }
372
};
373

    
374
static EbmlSyntax matroska_chapters[] = {
375
    { MATROSKA_ID_EDITIONENTRY,       EBML_NEST, 0, 0, {.n=matroska_chapter} },
376
    { EBML_ID_VOID,                   EBML_NONE },
377
    { 0 }
378
};
379

    
380
static EbmlSyntax matroska_index_pos[] = {
381
    { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
382
    { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos)   },
383
    { EBML_ID_VOID,                   EBML_NONE },
384
    { 0 }
385
};
386

    
387
static EbmlSyntax matroska_index_entry[] = {
388
    { MATROSKA_ID_CUETIME,            EBML_UINT, 0, offsetof(MatroskaIndex,time) },
389
    { MATROSKA_ID_CUETRACKPOSITION,   EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
390
    { EBML_ID_VOID,                   EBML_NONE },
391
    { 0 }
392
};
393

    
394
static EbmlSyntax matroska_index[] = {
395
    { MATROSKA_ID_POINTENTRY,         EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
396
    { EBML_ID_VOID,                   EBML_NONE },
397
    { 0 }
398
};
399

    
400
static EbmlSyntax matroska_tags[] = {
401
    { EBML_ID_VOID,                   EBML_NONE },
402
    { 0 }
403
};
404

    
405
static EbmlSyntax matroska_seekhead_entry[] = {
406
    { MATROSKA_ID_SEEKID,             EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
407
    { MATROSKA_ID_SEEKPOSITION,       EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
408
    { EBML_ID_VOID,                   EBML_NONE },
409
    { 0 }
410
};
411

    
412
static EbmlSyntax matroska_seekhead[] = {
413
    { MATROSKA_ID_SEEKENTRY,          EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
414
    { EBML_ID_VOID,                   EBML_NONE },
415
    { 0 }
416
};
417

    
418
static EbmlSyntax matroska_segment[] = {
419
    { MATROSKA_ID_INFO,           EBML_NEST, 0, 0, {.n=matroska_info       } },
420
    { MATROSKA_ID_TRACKS,         EBML_NEST, 0, 0, {.n=matroska_tracks     } },
421
    { MATROSKA_ID_ATTACHMENTS,    EBML_NEST, 0, 0, {.n=matroska_attachments} },
422
    { MATROSKA_ID_CHAPTERS,       EBML_NEST, 0, 0, {.n=matroska_chapters   } },
423
    { MATROSKA_ID_CUES,           EBML_NEST, 0, 0, {.n=matroska_index      } },
424
    { MATROSKA_ID_TAGS,           EBML_NEST, 0, 0, {.n=matroska_tags       } },
425
    { MATROSKA_ID_SEEKHEAD,       EBML_NEST, 0, 0, {.n=matroska_seekhead   } },
426
    { MATROSKA_ID_CLUSTER,        EBML_STOP, 0, offsetof(MatroskaDemuxContext,has_cluster_id) },
427
    { EBML_ID_VOID,               EBML_NONE },
428
    { 0 }
429
};
430

    
431
static EbmlSyntax matroska_segments[] = {
432
    { MATROSKA_ID_SEGMENT,        EBML_NEST, 0, 0, {.n=matroska_segment    } },
433
    { 0 }
434
};
435

    
436
static EbmlSyntax matroska_blockgroup[] = {
437
    { MATROSKA_ID_BLOCK,          EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
438
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
439
    { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
440
    { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
441
    { EBML_ID_VOID,               EBML_NONE },
442
    { 0 }
443
};
444

    
445
static EbmlSyntax matroska_cluster[] = {
446
    { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
447
    { MATROSKA_ID_BLOCKGROUP,     EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
448
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
449
    { EBML_ID_VOID,               EBML_NONE },
450
    { 0 }
451
};
452

    
453
static EbmlSyntax matroska_clusters[] = {
454
    { MATROSKA_ID_CLUSTER,        EBML_NEST, 0, 0, {.n=matroska_cluster} },
455
    { 0 }
456
};
457

    
458
/*
459
 * Return: whether we reached the end of a level in the hierarchy or not
460
 */
461
static int ebml_level_end(MatroskaDemuxContext *matroska)
462
{
463
    ByteIOContext *pb = matroska->ctx->pb;
464
    offset_t pos = url_ftell(pb);
465

    
466
    if (matroska->num_levels > 0) {
467
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
468
        if (pos - level->start >= level->length) {
469
            matroska->num_levels--;
470
            return 1;
471
        }
472
    }
473
    return 0;
474
}
475

    
476
/*
477
 * Read: an "EBML number", which is defined as a variable-length
478
 * array of bytes. The first byte indicates the length by giving a
479
 * number of 0-bits followed by a one. The position of the first
480
 * "one" bit inside the first byte indicates the length of this
481
 * number.
482
 * Returns: num. of bytes read. < 0 on error.
483
 */
484
static int ebml_read_num(MatroskaDemuxContext *matroska,
485
                         int max_size, uint64_t *number)
486
{
487
    ByteIOContext *pb = matroska->ctx->pb;
488
    int len_mask = 0x80, read = 1, n = 1;
489
    int64_t total = 0;
490

    
491
    /* the first byte tells us the length in bytes - get_byte() can normally
492
     * return 0, but since that's not a valid first ebmlID byte, we can
493
     * use it safely here to catch EOS. */
494
    if (!(total = get_byte(pb))) {
495
        /* we might encounter EOS here */
496
        if (!url_feof(pb)) {
497
            offset_t pos = url_ftell(pb);
498
            av_log(matroska->ctx, AV_LOG_ERROR,
499
                   "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
500
                   pos, pos);
501
        }
502
        return AVERROR(EIO); /* EOS or actual I/O error */
503
    }
504

    
505
    /* get the length of the EBML number */
506
    while (read <= max_size && !(total & len_mask)) {
507
        read++;
508
        len_mask >>= 1;
509
    }
510
    if (read > max_size) {
511
        offset_t pos = url_ftell(pb) - 1;
512
        av_log(matroska->ctx, AV_LOG_ERROR,
513
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
514
               (uint8_t) total, pos, pos);
515
        return AVERROR_INVALIDDATA;
516
    }
517

    
518
    /* read out length */
519
    total &= ~len_mask;
520
    while (n++ < read)
521
        total = (total << 8) | get_byte(pb);
522

    
523
    *number = total;
524

    
525
    return read;
526
}
527

    
528
/*
529
 * Read: the element content data ID.
530
 * 0 is success, < 0 is failure.
531
 */
532
static int ebml_read_element_id(MatroskaDemuxContext *matroska, uint32_t *id)
533
{
534
    int read;
535
    uint64_t total;
536

    
537
    /* if we re-call this, use our cached ID */
538
    if (matroska->peek_id != 0) {
539
        *id = matroska->peek_id;
540
        return 0;
541
    }
542

    
543
    /* read out the "EBML number", include tag in ID */
544
    if ((read = ebml_read_num(matroska, 4, &total)) < 0)
545
        return read;
546
    *id = matroska->peek_id  = total | (1 << (read * 7));
547

    
548
    return 0;
549
}
550

    
551
/*
552
 * Read: element content length.
553
 * Return: the number of bytes read or < 0 on error.
554
 */
555
static int ebml_read_element_length(MatroskaDemuxContext *matroska,
556
                                    uint64_t *length)
557
{
558
    /* clear cache since we're now beyond that data point */
559
    matroska->peek_id = 0;
560

    
561
    /* read out the "EBML number", include tag in ID */
562
    return ebml_read_num(matroska, 8, length);
563
}
564

    
565
/*
566
 * Seek to a given offset.
567
 * 0 is success, -1 is failure.
568
 */
569
static int ebml_read_seek(MatroskaDemuxContext *matroska, offset_t offset)
570
{
571
    ByteIOContext *pb = matroska->ctx->pb;
572

    
573
    /* clear ID cache, if any */
574
    matroska->peek_id = 0;
575

    
576
    return (url_fseek(pb, offset, SEEK_SET) == offset) ? 0 : -1;
577
}
578

    
579
/*
580
 * Read the next element as an unsigned int.
581
 * 0 is success, < 0 is failure.
582
 */
583
static int ebml_read_uint(ByteIOContext *pb, int size, uint64_t *num)
584
{
585
    int n = 0;
586

    
587
    if (size < 1 || size > 8)
588
        return AVERROR_INVALIDDATA;
589

    
590
    /* big-endian ordening; build up number */
591
    *num = 0;
592
    while (n++ < size)
593
        *num = (*num << 8) | get_byte(pb);
594

    
595
    return 0;
596
}
597

    
598
/*
599
 * Read the next element as a float.
600
 * 0 is success, < 0 is failure.
601
 */
602
static int ebml_read_float(ByteIOContext *pb, int size, double *num)
603
{
604
    if (size == 4) {
605
        *num= av_int2flt(get_be32(pb));
606
    } else if(size==8){
607
        *num= av_int2dbl(get_be64(pb));
608
    } else
609
        return AVERROR_INVALIDDATA;
610

    
611
    return 0;
612
}
613

    
614
/*
615
 * Read the next element as an ASCII string.
616
 * 0 is success, < 0 is failure.
617
 */
618
static int ebml_read_ascii(ByteIOContext *pb, int size, char **str)
619
{
620
    av_free(*str);
621
    /* ebml strings are usually not 0-terminated, so we allocate one
622
     * byte more, read the string and NULL-terminate it ourselves. */
623
    if (!(*str = av_malloc(size + 1)))
624
        return AVERROR(ENOMEM);
625
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
626
        av_free(*str);
627
        return AVERROR(EIO);
628
    }
629
    (*str)[size] = '\0';
630

    
631
    return 0;
632
}
633

    
634
/*
635
 * Read the next element, but only the header. The contents
636
 * are supposed to be sub-elements which can be read separately.
637
 * 0 is success, < 0 is failure.
638
 */
639
static int ebml_read_master(MatroskaDemuxContext *matroska, int length)
640
{
641
    ByteIOContext *pb = matroska->ctx->pb;
642
    MatroskaLevel *level;
643

    
644
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
645
        av_log(matroska->ctx, AV_LOG_ERROR,
646
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
647
        return AVERROR(ENOSYS);
648
    }
649

    
650
    level = &matroska->levels[matroska->num_levels++];
651
    level->start = url_ftell(pb);
652
    level->length = length;
653

    
654
    return 0;
655
}
656

    
657
/*
658
 * Read the next element as binary data.
659
 * 0 is success, < 0 is failure.
660
 */
661
static int ebml_read_binary(ByteIOContext *pb, int length, EbmlBin *bin)
662
{
663
    av_free(bin->data);
664
    if (!(bin->data = av_malloc(length)))
665
        return AVERROR(ENOMEM);
666

    
667
    bin->size = length;
668
    bin->pos  = url_ftell(pb);
669
    if (get_buffer(pb, bin->data, length) != length)
670
        return AVERROR(EIO);
671

    
672
    return 0;
673
}
674

    
675
/*
676
 * Read signed/unsigned "EBML" numbers.
677
 * Return: number of bytes processed, < 0 on error.
678
 * XXX: use ebml_read_num().
679
 */
680
static int matroska_ebmlnum_uint(uint8_t *data, uint32_t size, uint64_t *num)
681
{
682
    int len_mask = 0x80, read = 1, n = 1, num_ffs = 0;
683
    uint64_t total;
684

    
685
    if (size <= 0)
686
        return AVERROR_INVALIDDATA;
687

    
688
    total = data[0];
689
    while (read <= 8 && !(total & len_mask)) {
690
        read++;
691
        len_mask >>= 1;
692
    }
693
    if (read > 8)
694
        return AVERROR_INVALIDDATA;
695

    
696
    if ((total &= (len_mask - 1)) == len_mask - 1)
697
        num_ffs++;
698
    if (size < read)
699
        return AVERROR_INVALIDDATA;
700
    while (n < read) {
701
        if (data[n] == 0xff)
702
            num_ffs++;
703
        total = (total << 8) | data[n];
704
        n++;
705
    }
706

    
707
    if (read == num_ffs)
708
        *num = (uint64_t)-1;
709
    else
710
        *num = total;
711

    
712
    return read;
713
}
714

    
715
/*
716
 * Same as above, but signed.
717
 */
718
static int matroska_ebmlnum_sint(uint8_t *data, uint32_t size, int64_t *num)
719
{
720
    uint64_t unum;
721
    int res;
722

    
723
    /* read as unsigned number first */
724
    if ((res = matroska_ebmlnum_uint(data, size, &unum)) < 0)
725
        return res;
726

    
727
    /* make signed (weird way) */
728
    if (unum == (uint64_t)-1)
729
        *num = INT64_MAX;
730
    else
731
        *num = unum - ((1LL << ((7 * res) - 1)) - 1);
732

    
733
    return res;
734
}
735

    
736

    
737
static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
738
                                                 int num)
739
{
740
    MatroskaTrack *tracks = matroska->tracks.elem;
741
    int i;
742

    
743
    for (i=0; i < matroska->tracks.nb_elem; i++)
744
        if (tracks[i].num == num)
745
            return &tracks[i];
746

    
747
    av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
748
    return NULL;
749
}
750

    
751

    
752
/*
753
 * Put one packet in an application-supplied AVPacket struct.
754
 * Returns 0 on success or -1 on failure.
755
 */
756
static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
757
                                   AVPacket *pkt)
758
{
759
    if (matroska->num_packets > 0) {
760
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
761
        av_free(matroska->packets[0]);
762
        if (matroska->num_packets > 1) {
763
            memmove(&matroska->packets[0], &matroska->packets[1],
764
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
765
            matroska->packets =
766
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
767
                           sizeof(AVPacket *));
768
        } else {
769
            av_freep(&matroska->packets);
770
        }
771
        matroska->num_packets--;
772
        return 0;
773
    }
774

    
775
    return -1;
776
}
777

    
778
/*
779
 * Put a packet into our internal queue. Will be delivered to the
780
 * user/application during the next get_packet() call.
781
 */
782
static void matroska_queue_packet(MatroskaDemuxContext *matroska, AVPacket *pkt)
783
{
784
    matroska->packets =
785
        av_realloc(matroska->packets, (matroska->num_packets + 1) *
786
                   sizeof(AVPacket *));
787
    matroska->packets[matroska->num_packets] = pkt;
788
    matroska->num_packets++;
789
}
790

    
791
/*
792
 * Free all packets in our internal queue.
793
 */
794
static void matroska_clear_queue(MatroskaDemuxContext *matroska)
795
{
796
    if (matroska->packets) {
797
        int n;
798
        for (n = 0; n < matroska->num_packets; n++) {
799
            av_free_packet(matroska->packets[n]);
800
            av_free(matroska->packets[n]);
801
        }
802
        av_free(matroska->packets);
803
        matroska->packets = NULL;
804
        matroska->num_packets = 0;
805
    }
806
}
807

    
808

    
809
/*
810
 * Autodetecting...
811
 */
812
static int matroska_probe(AVProbeData *p)
813
{
814
    uint64_t total = 0;
815
    int len_mask = 0x80, size = 1, n = 1;
816
    char probe_data[] = "matroska";
817

    
818
    /* ebml header? */
819
    if (AV_RB32(p->buf) != EBML_ID_HEADER)
820
        return 0;
821

    
822
    /* length of header */
823
    total = p->buf[4];
824
    while (size <= 8 && !(total & len_mask)) {
825
        size++;
826
        len_mask >>= 1;
827
    }
828
    if (size > 8)
829
      return 0;
830
    total &= (len_mask - 1);
831
    while (n < size)
832
        total = (total << 8) | p->buf[4 + n++];
833

    
834
    /* does the probe data contain the whole header? */
835
    if (p->buf_size < 4 + size + total)
836
      return 0;
837

    
838
    /* the header must contain the document type 'matroska'. For now,
839
     * we don't parse the whole header but simply check for the
840
     * availability of that array of characters inside the header.
841
     * Not fully fool-proof, but good enough. */
842
    for (n = 4+size; n <= 4+size+total-(sizeof(probe_data)-1); n++)
843
        if (!memcmp(p->buf+n, probe_data, sizeof(probe_data)-1))
844
            return AVPROBE_SCORE_MAX;
845

    
846
    return 0;
847
}
848

    
849
static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
850
                      void *data, int once);
851

    
852
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
853
                           EbmlSyntax *syntax, void *data)
854
{
855
    ByteIOContext *pb = matroska->ctx->pb;
856
    uint32_t id = syntax->id;
857
    uint64_t length;
858
    int res;
859

    
860
    data = (char *)data + syntax->data_offset;
861
    if (syntax->list_elem_size) {
862
        EbmlList *list = data;
863
        list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
864
        data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
865
        memset(data, 0, syntax->list_elem_size);
866
        list->nb_elem++;
867
    }
868

    
869
    if (syntax->type != EBML_PASS && syntax->type != EBML_STOP)
870
        if ((res = ebml_read_element_id(matroska, &id)) < 0 ||
871
            (res = ebml_read_element_length(matroska, &length)) < 0)
872
            return res;
873

    
874
    switch (syntax->type) {
875
    case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
876
    case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
877
    case EBML_STR:
878
    case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
879
    case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
880
    case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
881
                         return res;
882
                     if (id == MATROSKA_ID_SEGMENT)
883
                         matroska->segment_start = url_ftell(matroska->ctx->pb);
884
                     return ebml_parse_nest(matroska, syntax->def.n, data, 0);
885
    case EBML_PASS:  return ebml_parse_nest(matroska, syntax->def.n, data, 1);
886
    case EBML_STOP:  *(int *)data = 1;      return 1;
887
    default:         url_fskip(pb, length); return 0;
888
    }
889
    if (res == AVERROR_INVALIDDATA)
890
        av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
891
    else if (res == AVERROR(EIO))
892
        av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
893
    return res;
894
}
895

    
896
static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
897
                         uint32_t id, void *data)
898
{
899
    int i;
900
    for (i=0; syntax[i].id; i++)
901
        if (id == syntax[i].id)
902
            break;
903
    if (!syntax[i].id)
904
        av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
905
    return ebml_parse_elem(matroska, &syntax[i], data);
906
}
907

    
908
static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
909
                      void *data, int once)
910
{
911
    int i, res = 0;
912
    uint32_t id = 0;
913

    
914
    for (i=0; syntax[i].id; i++)
915
        switch (syntax[i].type) {
916
        case EBML_UINT:
917
            *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
918
            break;
919
        case EBML_FLOAT:
920
            *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
921
            break;
922
        case EBML_STR:
923
        case EBML_UTF8:
924
            *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
925
            break;
926
        }
927

    
928
    while (!res && !ebml_level_end(matroska)) {
929
        res = ebml_read_element_id(matroska, &id);
930
        if (!res)
931
        res = ebml_parse_id(matroska, syntax, id, data);
932
        if (once)
933
            break;
934
    }
935

    
936
    return res;
937
}
938

    
939
static void ebml_free(EbmlSyntax *syntax, void *data)
940
{
941
    int i, j;
942
    for (i=0; syntax[i].id; i++) {
943
        void *data_off = (char *)data + syntax[i].data_offset;
944
        switch (syntax[i].type) {
945
        case EBML_STR:
946
        case EBML_UTF8:  av_freep(data_off);                      break;
947
        case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
948
        case EBML_NEST:
949
            if (syntax[i].list_elem_size) {
950
                EbmlList *list = data_off;
951
                char *ptr = list->elem;
952
                for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
953
                    ebml_free(syntax[i].def.n, ptr);
954
                av_free(list->elem);
955
            } else
956
                ebml_free(syntax[i].def.n, data_off);
957
        default:  break;
958
        }
959
    }
960
}
961

    
962
static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
963
                                  MatroskaTrack *track)
964
{
965
    MatroskaTrackEncoding *encodings = track->encodings.elem;
966
    uint8_t* data = *buf;
967
    int isize = *buf_size;
968
    uint8_t* pkt_data = NULL;
969
    int pkt_size = isize;
970
    int result = 0;
971
    int olen;
972

    
973
    switch (encodings[0].compression.algo) {
974
    case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
975
        return encodings[0].compression.settings.size;
976
    case MATROSKA_TRACK_ENCODING_COMP_LZO:
977
        do {
978
            olen = pkt_size *= 3;
979
            pkt_data = av_realloc(pkt_data,
980
                                  pkt_size+LZO_OUTPUT_PADDING);
981
            result = lzo1x_decode(pkt_data, &olen, data, &isize);
982
        } while (result==LZO_OUTPUT_FULL && pkt_size<10000000);
983
        if (result)
984
            goto failed;
985
        pkt_size -= olen;
986
        break;
987
#ifdef CONFIG_ZLIB
988
    case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
989
        z_stream zstream = {0};
990
        if (inflateInit(&zstream) != Z_OK)
991
            return -1;
992
        zstream.next_in = data;
993
        zstream.avail_in = isize;
994
        do {
995
            pkt_size *= 3;
996
            pkt_data = av_realloc(pkt_data, pkt_size);
997
            zstream.avail_out = pkt_size - zstream.total_out;
998
            zstream.next_out = pkt_data + zstream.total_out;
999
            result = inflate(&zstream, Z_NO_FLUSH);
1000
        } while (result==Z_OK && pkt_size<10000000);
1001
        pkt_size = zstream.total_out;
1002
        inflateEnd(&zstream);
1003
        if (result != Z_STREAM_END)
1004
            goto failed;
1005
        break;
1006
    }
1007
#endif
1008
#ifdef CONFIG_BZLIB
1009
    case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
1010
        bz_stream bzstream = {0};
1011
        if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
1012
            return -1;
1013
        bzstream.next_in = data;
1014
        bzstream.avail_in = isize;
1015
        do {
1016
            pkt_size *= 3;
1017
            pkt_data = av_realloc(pkt_data, pkt_size);
1018
            bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
1019
            bzstream.next_out = pkt_data + bzstream.total_out_lo32;
1020
            result = BZ2_bzDecompress(&bzstream);
1021
        } while (result==BZ_OK && pkt_size<10000000);
1022
        pkt_size = bzstream.total_out_lo32;
1023
        BZ2_bzDecompressEnd(&bzstream);
1024
        if (result != BZ_STREAM_END)
1025
            goto failed;
1026
        break;
1027
    }
1028
#endif
1029
    }
1030

    
1031
    *buf = pkt_data;
1032
    *buf_size = pkt_size;
1033
    return 0;
1034
 failed:
1035
    av_free(pkt_data);
1036
    return -1;
1037
}
1038

    
1039
static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1040
{
1041
    EbmlList *seekhead_list = &matroska->seekhead;
1042
    MatroskaSeekhead *seekhead = seekhead_list->elem;
1043
    uint32_t peek_id_cache = matroska->peek_id;
1044
    uint32_t level_up = matroska->level_up;
1045
    offset_t before_pos = url_ftell(matroska->ctx->pb);
1046
    MatroskaLevel level;
1047
    int i;
1048

    
1049
    for (i=0; i<seekhead_list->nb_elem; i++) {
1050
        if (seekhead[i].pos <= before_pos
1051
            || seekhead[i].id == MATROSKA_ID_SEEKHEAD
1052
            || seekhead[i].id == MATROSKA_ID_CLUSTER)
1053
            continue;
1054

    
1055
        /* seek */
1056
        if (ebml_read_seek(matroska,
1057
                           seekhead[i].pos+matroska->segment_start) < 0)
1058
            continue;
1059

    
1060
        /* we don't want to lose our seekhead level, so we add
1061
         * a dummy. This is a crude hack. */
1062
        if (matroska->num_levels == EBML_MAX_DEPTH) {
1063
            av_log(matroska->ctx, AV_LOG_INFO,
1064
                   "Max EBML element depth (%d) reached, "
1065
                   "cannot parse further.\n", EBML_MAX_DEPTH);
1066
            break;
1067
        }
1068

    
1069
        level.start = 0;
1070
        level.length = (uint64_t)-1;
1071
        matroska->levels[matroska->num_levels] = level;
1072
        matroska->num_levels++;
1073

    
1074
        ebml_parse_id(matroska, matroska_segment, seekhead[i].id, matroska);
1075

    
1076
        /* remove dummy level */
1077
        while (matroska->num_levels) {
1078
            uint64_t length = matroska->levels[--matroska->num_levels].length;
1079
            if (length == (uint64_t)-1)
1080
                break;
1081
        }
1082
    }
1083

    
1084
    /* seek back */
1085
    ebml_read_seek(matroska, before_pos);
1086
    matroska->peek_id = peek_id_cache;
1087
    matroska->level_up = level_up;
1088
}
1089

    
1090
static int matroska_aac_profile(char *codec_id)
1091
{
1092
    static const char *aac_profiles[] = { "MAIN", "LC", "SSR" };
1093
    int profile;
1094

    
1095
    for (profile=0; profile<ARRAY_SIZE(aac_profiles); profile++)
1096
        if (strstr(codec_id, aac_profiles[profile]))
1097
            break;
1098
    return profile + 1;
1099
}
1100

    
1101
static int matroska_aac_sri(int samplerate)
1102
{
1103
    int sri;
1104

    
1105
    for (sri=0; sri<ARRAY_SIZE(ff_mpeg4audio_sample_rates); sri++)
1106
        if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1107
            break;
1108
    return sri;
1109
}
1110

    
1111
static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1112
{
1113
    MatroskaDemuxContext *matroska = s->priv_data;
1114
    EbmlList *attachements_list = &matroska->attachments;
1115
    MatroskaAttachement *attachements;
1116
    EbmlList *chapters_list = &matroska->chapters;
1117
    MatroskaChapter *chapters;
1118
    MatroskaTrack *tracks;
1119
    EbmlList *index_list;
1120
    MatroskaIndex *index;
1121
    Ebml ebml = { 0 };
1122
    AVStream *st;
1123
    int i, j;
1124

    
1125
    matroska->ctx = s;
1126

    
1127
    /* First read the EBML header. */
1128
    if (ebml_parse_nest(matroska, ebml_syntax, &ebml, 1)
1129
        || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1130
        || ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
1131
        || ebml.doctype_version > 2) {
1132
        av_log(matroska->ctx, AV_LOG_ERROR,
1133
               "EBML header using unsupported features\n"
1134
               "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1135
               ebml.version, ebml.doctype, ebml.doctype_version);
1136
        return AVERROR_NOFMT;
1137
    }
1138
    ebml_free(ebml_syntax, &ebml);
1139

    
1140
    /* The next thing is a segment. */
1141
    if (ebml_parse_nest(matroska, matroska_segments, matroska, 1) < 0)
1142
        return -1;
1143
    matroska_execute_seekhead(matroska);
1144

    
1145
    if (matroska->duration)
1146
        matroska->ctx->duration = matroska->duration * matroska->time_scale
1147
                                  * 1000 / AV_TIME_BASE;
1148
    if (matroska->title)
1149
        strncpy(matroska->ctx->title, matroska->title,
1150
                sizeof(matroska->ctx->title)-1);
1151

    
1152
    tracks = matroska->tracks.elem;
1153
    for (i=0; i < matroska->tracks.nb_elem; i++) {
1154
        MatroskaTrack *track = &tracks[i];
1155
        enum CodecID codec_id = CODEC_ID_NONE;
1156
        EbmlList *encodings_list = &tracks->encodings;
1157
        MatroskaTrackEncoding *encodings = encodings_list->elem;
1158
        uint8_t *extradata = NULL;
1159
        int extradata_size = 0;
1160
        int extradata_offset = 0;
1161

    
1162
        /* Apply some sanity checks. */
1163
        if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1164
            track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1165
            track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1166
            av_log(matroska->ctx, AV_LOG_INFO,
1167
                   "Unknown or unsupported track type %"PRIu64"\n",
1168
                   track->type);
1169
            continue;
1170
        }
1171
        if (track->codec_id == NULL)
1172
            continue;
1173

    
1174
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1175
            if (!track->default_duration)
1176
                track->default_duration = 1000000000/track->video.frame_rate;
1177
            if (!track->video.display_width)
1178
                track->video.display_width = track->video.pixel_width;
1179
            if (!track->video.display_height)
1180
                track->video.display_height = track->video.pixel_height;
1181
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1182
            if (!track->audio.out_samplerate)
1183
                track->audio.out_samplerate = track->audio.samplerate;
1184
        }
1185
        if (encodings_list->nb_elem > 1) {
1186
            av_log(matroska->ctx, AV_LOG_ERROR,
1187
                   "Multiple combined encodings no supported");
1188
        } else if (encodings_list->nb_elem == 1) {
1189
            if (encodings[0].type ||
1190
                (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1191
#ifdef CONFIG_ZLIB
1192
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1193
#endif
1194
#ifdef CONFIG_BZLIB
1195
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1196
#endif
1197
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1198
                encodings[0].scope = 0;
1199
                av_log(matroska->ctx, AV_LOG_ERROR,
1200
                       "Unsupported encoding type");
1201
            } else if (track->codec_priv.size && encodings[0].scope&2) {
1202
                uint8_t *codec_priv = track->codec_priv.data;
1203
                int offset = matroska_decode_buffer(&track->codec_priv.data,
1204
                                                    &track->codec_priv.size,
1205
                                                    track);
1206
                if (offset < 0) {
1207
                    track->codec_priv.data = NULL;
1208
                    track->codec_priv.size = 0;
1209
                    av_log(matroska->ctx, AV_LOG_ERROR,
1210
                           "Failed to decode codec private data\n");
1211
                } else if (offset > 0) {
1212
                    track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1213
                    memcpy(track->codec_priv.data,
1214
                           encodings[0].compression.settings.data, offset);
1215
                    memcpy(track->codec_priv.data+offset, codec_priv,
1216
                           track->codec_priv.size);
1217
                    track->codec_priv.size += offset;
1218
                }
1219
                if (codec_priv != track->codec_priv.data)
1220
                    av_free(codec_priv);
1221
            }
1222
        }
1223

    
1224
        for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1225
            if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1226
                        strlen(ff_mkv_codec_tags[j].str))){
1227
                codec_id= ff_mkv_codec_tags[j].id;
1228
                break;
1229
            }
1230
        }
1231

    
1232
        st = track->stream = av_new_stream(s, matroska->num_streams++);
1233
        if (st == NULL)
1234
            return AVERROR(ENOMEM);
1235

    
1236
        if (!strcmp(track->codec_id, MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC)
1237
            && track->codec_priv.size >= 40
1238
            && track->codec_priv.data != NULL) {
1239
            track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1240
            codec_id = codec_get_id(codec_bmp_tags, track->video.fourcc);
1241
        } else if (!strcmp(track->codec_id, MATROSKA_CODEC_ID_AUDIO_ACM)
1242
                   && track->codec_priv.size >= 18
1243
                   && track->codec_priv.data != NULL) {
1244
            uint16_t tag = AV_RL16(track->codec_priv.data);
1245
            codec_id = codec_get_id(codec_wav_tags, tag);
1246
        } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1247
                   && (track->codec_priv.size >= 86)
1248
                   && (track->codec_priv.data != NULL)) {
1249
            track->video.fourcc = AV_RL32(track->codec_priv.data);
1250
            codec_id=codec_get_id(codec_movvideo_tags, track->video.fourcc);
1251
        } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1252
            int profile = matroska_aac_profile(track->codec_id);
1253
            int sri = matroska_aac_sri(track->audio.samplerate);
1254
            extradata = av_malloc(5);
1255
            if (extradata == NULL)
1256
                return AVERROR(ENOMEM);
1257
            extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1258
            extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1259
            if (strstr(track->codec_id, "SBR")) {
1260
                sri = matroska_aac_sri(track->audio.out_samplerate);
1261
                extradata[2] = 0x56;
1262
                extradata[3] = 0xE5;
1263
                extradata[4] = 0x80 | (sri<<3);
1264
                extradata_size = 5;
1265
            } else
1266
                extradata_size = 2;
1267
        } else if (codec_id == CODEC_ID_TTA) {
1268
            ByteIOContext b;
1269
            extradata_size = 30;
1270
            extradata = av_mallocz(extradata_size);
1271
            if (extradata == NULL)
1272
                return AVERROR(ENOMEM);
1273
            init_put_byte(&b, extradata, extradata_size, 1,
1274
                          NULL, NULL, NULL, NULL);
1275
            put_buffer(&b, "TTA1", 4);
1276
            put_le16(&b, 1);
1277
            put_le16(&b, track->audio.channels);
1278
            put_le16(&b, track->audio.bitdepth);
1279
            put_le32(&b, track->audio.out_samplerate);
1280
            put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1281
        } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1282
                   codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1283
            extradata_offset = 26;
1284
            track->codec_priv.size -= extradata_offset;
1285
        } else if (codec_id == CODEC_ID_RA_144) {
1286
            track->audio.out_samplerate = 8000;
1287
            track->audio.channels = 1;
1288
        } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1289
                   codec_id == CODEC_ID_ATRAC3) {
1290
            ByteIOContext b;
1291

    
1292
            init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1293
                          0, NULL, NULL, NULL, NULL);
1294
            url_fskip(&b, 24);
1295
            track->audio.coded_framesize = get_be32(&b);
1296
            url_fskip(&b, 12);
1297
            track->audio.sub_packet_h    = get_be16(&b);
1298
            track->audio.frame_size      = get_be16(&b);
1299
            track->audio.sub_packet_size = get_be16(&b);
1300
            track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1301
            if (codec_id == CODEC_ID_RA_288) {
1302
                st->codec->block_align = track->audio.coded_framesize;
1303
                track->codec_priv.size = 0;
1304
            } else {
1305
                st->codec->block_align = track->audio.sub_packet_size;
1306
                extradata_offset = 78;
1307
                track->codec_priv.size -= extradata_offset;
1308
            }
1309
        }
1310

    
1311
        if (codec_id == CODEC_ID_NONE)
1312
            av_log(matroska->ctx, AV_LOG_INFO,
1313
                   "Unknown/unsupported CodecID %s.\n", track->codec_id);
1314

    
1315
        av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1316

    
1317
        st->codec->codec_id = codec_id;
1318
        st->start_time = 0;
1319
        if (strcmp(track->language, "und"))
1320
            av_strlcpy(st->language, track->language, 4);
1321

    
1322
        if (track->flag_default)
1323
            st->disposition |= AV_DISPOSITION_DEFAULT;
1324

    
1325
        if (track->default_duration)
1326
            av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1327
                      track->default_duration, 1000000000, 30000);
1328

    
1329
        if(extradata){
1330
            st->codec->extradata = extradata;
1331
            st->codec->extradata_size = extradata_size;
1332
        } else if(track->codec_priv.data && track->codec_priv.size > 0){
1333
            st->codec->extradata = av_malloc(track->codec_priv.size);
1334
            if(st->codec->extradata == NULL)
1335
                return AVERROR(ENOMEM);
1336
            st->codec->extradata_size = track->codec_priv.size;
1337
            memcpy(st->codec->extradata,
1338
                   track->codec_priv.data + extradata_offset,
1339
                   track->codec_priv.size);
1340
        }
1341

    
1342
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1343
            st->codec->codec_type = CODEC_TYPE_VIDEO;
1344
            st->codec->codec_tag  = track->video.fourcc;
1345
            st->codec->width  = track->video.pixel_width;
1346
            st->codec->height = track->video.pixel_height;
1347
            av_reduce(&st->codec->sample_aspect_ratio.num,
1348
                      &st->codec->sample_aspect_ratio.den,
1349
                      st->codec->height * track->video.display_width,
1350
                      st->codec-> width * track->video.display_height,
1351
                      255);
1352
            st->need_parsing = AVSTREAM_PARSE_HEADERS;
1353
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1354
            st->codec->codec_type = CODEC_TYPE_AUDIO;
1355
            st->codec->sample_rate = track->audio.out_samplerate;
1356
            st->codec->channels = track->audio.channels;
1357
        } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1358
            st->codec->codec_type = CODEC_TYPE_SUBTITLE;
1359
        }
1360
    }
1361

    
1362
    attachements = attachements_list->elem;
1363
    for (j=0; j<attachements_list->nb_elem; j++) {
1364
        if (!(attachements[j].filename && attachements[j].mime &&
1365
              attachements[j].bin.data && attachements[j].bin.size > 0)) {
1366
            av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1367
        } else {
1368
            AVStream *st = av_new_stream(s, matroska->num_streams++);
1369
            if (st == NULL)
1370
                break;
1371
            st->filename          = av_strdup(attachements[j].filename);
1372
            st->codec->codec_id = CODEC_ID_NONE;
1373
            st->codec->codec_type = CODEC_TYPE_ATTACHMENT;
1374
            st->codec->extradata  = av_malloc(attachements[j].bin.size);
1375
            if(st->codec->extradata == NULL)
1376
                break;
1377
            st->codec->extradata_size = attachements[j].bin.size;
1378
            memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1379

    
1380
            for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1381
                if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1382
                             strlen(ff_mkv_mime_tags[i].str))) {
1383
                    st->codec->codec_id = ff_mkv_mime_tags[i].id;
1384
                    break;
1385
                }
1386
            }
1387
        }
1388
    }
1389

    
1390
    chapters = chapters_list->elem;
1391
    for (i=0; i<chapters_list->nb_elem; i++)
1392
        if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid)
1393
            ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1394
                           chapters[i].start, chapters[i].end,
1395
                           chapters[i].title);
1396

    
1397
    index_list = &matroska->index;
1398
    index = index_list->elem;
1399
    for (i=0; i<index_list->nb_elem; i++) {
1400
        EbmlList *pos_list = &index[i].pos;
1401
        MatroskaIndexPos *pos = pos_list->elem;
1402
        for (j=0; j<pos_list->nb_elem; j++) {
1403
            MatroskaTrack *track = matroska_find_track_by_num(matroska,
1404
                                                              pos[j].track);
1405
            if (track && track->stream)
1406
                av_add_index_entry(track->stream,
1407
                                   pos[j].pos + matroska->segment_start,
1408
                                   index[i].time*matroska->time_scale/AV_TIME_BASE,
1409
                                   0, 0, AVINDEX_KEYFRAME);
1410
        }
1411
    }
1412

    
1413
    return 0;
1414
}
1415

    
1416
static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1417
                                int size, int64_t pos, uint64_t cluster_time,
1418
                                uint64_t duration, int is_keyframe)
1419
{
1420
    MatroskaTrack *track;
1421
    int res = 0;
1422
    AVStream *st;
1423
    AVPacket *pkt;
1424
    int16_t block_time;
1425
    uint32_t *lace_size = NULL;
1426
    int n, flags, laces = 0;
1427
    uint64_t num;
1428

    
1429
    if ((n = matroska_ebmlnum_uint(data, size, &num)) < 0) {
1430
        av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1431
        return res;
1432
    }
1433
    data += n;
1434
    size -= n;
1435

    
1436
    track = matroska_find_track_by_num(matroska, num);
1437
    if (size <= 3 || !track || !track->stream) {
1438
        av_log(matroska->ctx, AV_LOG_INFO,
1439
               "Invalid stream %"PRIu64" or size %u\n", num, size);
1440
        return res;
1441
    }
1442
    st = track->stream;
1443
    if (st->discard >= AVDISCARD_ALL)
1444
        return res;
1445
    if (duration == AV_NOPTS_VALUE)
1446
        duration = track->default_duration / matroska->time_scale;
1447

    
1448
    block_time = AV_RB16(data);
1449
    data += 2;
1450
    flags = *data++;
1451
    size -= 3;
1452
    if (is_keyframe == -1)
1453
        is_keyframe = flags & 0x80 ? PKT_FLAG_KEY : 0;
1454

    
1455
    if (matroska->skip_to_keyframe) {
1456
        if (!is_keyframe || st != matroska->skip_to_stream)
1457
            return res;
1458
        matroska->skip_to_keyframe = 0;
1459
    }
1460

    
1461
    switch ((flags & 0x06) >> 1) {
1462
        case 0x0: /* no lacing */
1463
            laces = 1;
1464
            lace_size = av_mallocz(sizeof(int));
1465
            lace_size[0] = size;
1466
            break;
1467

    
1468
        case 0x1: /* xiph lacing */
1469
        case 0x2: /* fixed-size lacing */
1470
        case 0x3: /* EBML lacing */
1471
            assert(size>0); // size <=3 is checked before size-=3 above
1472
            laces = (*data) + 1;
1473
            data += 1;
1474
            size -= 1;
1475
            lace_size = av_mallocz(laces * sizeof(int));
1476

    
1477
            switch ((flags & 0x06) >> 1) {
1478
                case 0x1: /* xiph lacing */ {
1479
                    uint8_t temp;
1480
                    uint32_t total = 0;
1481
                    for (n = 0; res == 0 && n < laces - 1; n++) {
1482
                        while (1) {
1483
                            if (size == 0) {
1484
                                res = -1;
1485
                                break;
1486
                            }
1487
                            temp = *data;
1488
                            lace_size[n] += temp;
1489
                            data += 1;
1490
                            size -= 1;
1491
                            if (temp != 0xff)
1492
                                break;
1493
                        }
1494
                        total += lace_size[n];
1495
                    }
1496
                    lace_size[n] = size - total;
1497
                    break;
1498
                }
1499

    
1500
                case 0x2: /* fixed-size lacing */
1501
                    for (n = 0; n < laces; n++)
1502
                        lace_size[n] = size / laces;
1503
                    break;
1504

    
1505
                case 0x3: /* EBML lacing */ {
1506
                    uint32_t total;
1507
                    n = matroska_ebmlnum_uint(data, size, &num);
1508
                    if (n < 0) {
1509
                        av_log(matroska->ctx, AV_LOG_INFO,
1510
                               "EBML block data error\n");
1511
                        break;
1512
                    }
1513
                    data += n;
1514
                    size -= n;
1515
                    total = lace_size[0] = num;
1516
                    for (n = 1; res == 0 && n < laces - 1; n++) {
1517
                        int64_t snum;
1518
                        int r;
1519
                        r = matroska_ebmlnum_sint (data, size, &snum);
1520
                        if (r < 0) {
1521
                            av_log(matroska->ctx, AV_LOG_INFO,
1522
                                   "EBML block data error\n");
1523
                            break;
1524
                        }
1525
                        data += r;
1526
                        size -= r;
1527
                        lace_size[n] = lace_size[n - 1] + snum;
1528
                        total += lace_size[n];
1529
                    }
1530
                    lace_size[n] = size - total;
1531
                    break;
1532
                }
1533
            }
1534
            break;
1535
    }
1536

    
1537
    if (res == 0) {
1538
        uint64_t timecode = AV_NOPTS_VALUE;
1539

    
1540
        if (cluster_time != (uint64_t)-1
1541
            && (block_time >= 0 || cluster_time >= -block_time))
1542
            timecode = cluster_time + block_time;
1543

    
1544
        for (n = 0; n < laces; n++) {
1545
            if (st->codec->codec_id == CODEC_ID_RA_288 ||
1546
                st->codec->codec_id == CODEC_ID_COOK ||
1547
                st->codec->codec_id == CODEC_ID_ATRAC3) {
1548
                int a = st->codec->block_align;
1549
                int sps = track->audio.sub_packet_size;
1550
                int cfs = track->audio.coded_framesize;
1551
                int h = track->audio.sub_packet_h;
1552
                int y = track->audio.sub_packet_cnt;
1553
                int w = track->audio.frame_size;
1554
                int x;
1555

    
1556
                if (!track->audio.pkt_cnt) {
1557
                    if (st->codec->codec_id == CODEC_ID_RA_288)
1558
                        for (x=0; x<h/2; x++)
1559
                            memcpy(track->audio.buf+x*2*w+y*cfs,
1560
                                   data+x*cfs, cfs);
1561
                    else
1562
                        for (x=0; x<w/sps; x++)
1563
                            memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1564

    
1565
                    if (++track->audio.sub_packet_cnt >= h) {
1566
                        track->audio.sub_packet_cnt = 0;
1567
                        track->audio.pkt_cnt = h*w / a;
1568
                    }
1569
                }
1570
                while (track->audio.pkt_cnt) {
1571
                    pkt = av_mallocz(sizeof(AVPacket));
1572
                    av_new_packet(pkt, a);
1573
                    memcpy(pkt->data, track->audio.buf
1574
                           + a * (h*w / a - track->audio.pkt_cnt--), a);
1575
                    pkt->pos = pos;
1576
                    pkt->stream_index = st->index;
1577
                    matroska_queue_packet(matroska, pkt);
1578
                }
1579
            } else {
1580
                MatroskaTrackEncoding *encodings = track->encodings.elem;
1581
                int offset = 0, pkt_size = lace_size[n];
1582
                uint8_t *pkt_data = data;
1583

    
1584
                if (encodings && encodings->scope & 1) {
1585
                    offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1586
                    if (offset < 0)
1587
                        continue;
1588
                }
1589

    
1590
                pkt = av_mallocz(sizeof(AVPacket));
1591
                /* XXX: prevent data copy... */
1592
                if (av_new_packet(pkt, pkt_size+offset) < 0) {
1593
                    av_free(pkt);
1594
                    res = AVERROR(ENOMEM);
1595
                    n = laces-1;
1596
                    break;
1597
                }
1598
                if (offset)
1599
                    memcpy (pkt->data, encodings->compression.settings.data, offset);
1600
                memcpy (pkt->data+offset, pkt_data, pkt_size);
1601

    
1602
                if (pkt_data != data)
1603
                    av_free(pkt_data);
1604

    
1605
                if (n == 0)
1606
                    pkt->flags = is_keyframe;
1607
                pkt->stream_index = st->index;
1608

    
1609
                pkt->pts = timecode;
1610
                pkt->pos = pos;
1611
                pkt->duration = duration;
1612

    
1613
                matroska_queue_packet(matroska, pkt);
1614
            }
1615

    
1616
            if (timecode != AV_NOPTS_VALUE)
1617
                timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1618
            data += lace_size[n];
1619
        }
1620
    }
1621

    
1622
    av_free(lace_size);
1623
    return res;
1624
}
1625

    
1626
static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1627
{
1628
    MatroskaCluster cluster = { 0 };
1629
    EbmlList *blocks_list;
1630
    MatroskaBlock *blocks;
1631
    int i, res = ebml_parse_nest(matroska, matroska_clusters, &cluster, 1);
1632
    blocks_list = &cluster.blocks;
1633
    blocks = blocks_list->elem;
1634
    for (i=0; !res && i<blocks_list->nb_elem; i++)
1635
        if (blocks[i].bin.size > 0)
1636
            res=matroska_parse_block(matroska,
1637
                                     blocks[i].bin.data, blocks[i].bin.size,
1638
                                     blocks[i].bin.pos,  cluster.timecode,
1639
                                     blocks[i].duration, !blocks[i].reference);
1640
    ebml_free(matroska_cluster, &cluster);
1641
    return res;
1642
}
1643

    
1644
static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1645
{
1646
    MatroskaDemuxContext *matroska = s->priv_data;
1647

    
1648
    while (matroska_deliver_packet(matroska, pkt)) {
1649
        if (matroska->done)
1650
            return AVERROR(EIO);
1651
        if (matroska_parse_cluster(matroska) < 0)
1652
            matroska->done = 1;
1653
    }
1654

    
1655
    return 0;
1656
}
1657

    
1658
static int matroska_read_seek(AVFormatContext *s, int stream_index,
1659
                              int64_t timestamp, int flags)
1660
{
1661
    MatroskaDemuxContext *matroska = s->priv_data;
1662
    AVStream *st = s->streams[stream_index];
1663
    int index;
1664

    
1665
    index = av_index_search_timestamp(st, timestamp, flags);
1666
    if (index < 0)
1667
        return 0;
1668

    
1669
    matroska_clear_queue(matroska);
1670

    
1671
    url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
1672
    matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1673
    matroska->skip_to_stream = st;
1674
    matroska->peek_id = 0;
1675
    av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1676
    return 0;
1677
}
1678

    
1679
static int matroska_read_close(AVFormatContext *s)
1680
{
1681
    MatroskaDemuxContext *matroska = s->priv_data;
1682
    MatroskaTrack *tracks = matroska->tracks.elem;
1683
    int n;
1684

    
1685
    matroska_clear_queue(matroska);
1686

    
1687
    for (n=0; n < matroska->tracks.nb_elem; n++)
1688
        if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1689
            av_free(tracks[n].audio.buf);
1690
    ebml_free(matroska_segment, matroska);
1691

    
1692
    return 0;
1693
}
1694

    
1695
AVInputFormat matroska_demuxer = {
1696
    "matroska",
1697
    NULL_IF_CONFIG_SMALL("Matroska file format"),
1698
    sizeof(MatroskaDemuxContext),
1699
    matroska_probe,
1700
    matroska_read_header,
1701
    matroska_read_packet,
1702
    matroska_read_close,
1703
    matroska_read_seek,
1704
};