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ffmpeg / libavformat / matroskadec.c @ 0871e65c

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/*
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 * Matroska file demuxer
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 * Copyright (c) 2003-2008 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 libavformat/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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 * totally reworked by Aurelien Jacobs <aurel@gnuage.org>
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 * Specs available on the Matroska project page: http://www.matroska.org/.
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 */
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#include <stdio.h>
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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/intreadwrite.h"
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#include "libavutil/avstring.h"
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#include "libavutil/lzo.h"
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#if CONFIG_ZLIB
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#include <zlib.h>
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#endif
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#if 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;
60

    
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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;
78

    
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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;
84

    
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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;
92

    
93
typedef struct {
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    uint64_t algo;
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    EbmlBin  settings;
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} MatroskaTrackCompression;
97

    
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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;
103

    
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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;
112

    
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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;
128

    
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typedef struct {
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    uint64_t num;
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    uint64_t uid;
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    uint64_t type;
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    char    *name;
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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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    int64_t end_timecode;
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} MatroskaTrack;
147

    
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typedef struct {
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    uint64_t uid;
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    char *filename;
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    char *mime;
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    EbmlBin bin;
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    AVStream *stream;
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} MatroskaAttachement;
156

    
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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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    AVChapter *chapter;
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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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    char *name;
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    char *string;
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    char *lang;
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    uint64_t def;
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    EbmlList sub;
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} MatroskaTag;
183

    
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typedef struct {
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    char    *type;
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    uint64_t typevalue;
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    uint64_t trackuid;
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    uint64_t chapteruid;
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    uint64_t attachuid;
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} MatroskaTagTarget;
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typedef struct {
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    MatroskaTagTarget target;
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    EbmlList tag;
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} MatroskaTags;
196

    
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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 tags;
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    EbmlList seekhead;
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    /* byte position of the segment inside the stream */
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    int64_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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    AVPacket *prev_pkt;
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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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    uint64_t skip_to_timecode;
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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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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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    { 0 }
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};
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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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};
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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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    { 0 }
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};
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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_VIDEOPIXELCROPB,    EBML_NONE },
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    { MATROSKA_ID_VIDEOPIXELCROPT,    EBML_NONE },
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    { MATROSKA_ID_VIDEOPIXELCROPL,    EBML_NONE },
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    { MATROSKA_ID_VIDEOPIXELCROPR,    EBML_NONE },
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    { MATROSKA_ID_VIDEODISPLAYUNIT,   EBML_NONE },
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    { MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
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    { MATROSKA_ID_VIDEOSTEREOMODE,    EBML_NONE },
293
    { MATROSKA_ID_VIDEOASPECTRATIO,   EBML_NONE },
294
    { 0 }
295
};
296

    
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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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    { 0 }
303
};
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static EbmlSyntax matroska_track_encoding_compression[] = {
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    { MATROSKA_ID_ENCODINGCOMPALGO,   EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
307
    { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
308
    { 0 }
309
};
310

    
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static EbmlSyntax matroska_track_encoding[] = {
312
    { MATROSKA_ID_ENCODINGSCOPE,      EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
313
    { MATROSKA_ID_ENCODINGTYPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
314
    { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
315
    { MATROSKA_ID_ENCODINGORDER,      EBML_NONE },
316
    { 0 }
317
};
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static EbmlSyntax matroska_track_encodings[] = {
320
    { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
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    { 0 }
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};
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static EbmlSyntax matroska_track[] = {
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    { MATROSKA_ID_TRACKNUMBER,          EBML_UINT, 0, offsetof(MatroskaTrack,num) },
326
    { MATROSKA_ID_TRACKNAME,            EBML_UTF8, 0, offsetof(MatroskaTrack,name) },
327
    { MATROSKA_ID_TRACKUID,             EBML_UINT, 0, offsetof(MatroskaTrack,uid) },
328
    { MATROSKA_ID_TRACKTYPE,            EBML_UINT, 0, offsetof(MatroskaTrack,type) },
329
    { MATROSKA_ID_CODECID,              EBML_STR,  0, offsetof(MatroskaTrack,codec_id) },
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    { MATROSKA_ID_CODECPRIVATE,         EBML_BIN,  0, offsetof(MatroskaTrack,codec_priv) },
331
    { MATROSKA_ID_TRACKLANGUAGE,        EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
332
    { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
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    { MATROSKA_ID_TRACKTIMECODESCALE,   EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
334
    { MATROSKA_ID_TRACKFLAGDEFAULT,     EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
335
    { MATROSKA_ID_TRACKVIDEO,           EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
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    { MATROSKA_ID_TRACKAUDIO,           EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
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    { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
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    { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
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    { MATROSKA_ID_TRACKFLAGFORCED,      EBML_NONE },
340
    { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
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    { MATROSKA_ID_CODECNAME,            EBML_NONE },
342
    { MATROSKA_ID_CODECDECODEALL,       EBML_NONE },
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    { MATROSKA_ID_CODECINFOURL,         EBML_NONE },
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    { MATROSKA_ID_CODECDOWNLOADURL,     EBML_NONE },
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    { MATROSKA_ID_TRACKMINCACHE,        EBML_NONE },
346
    { MATROSKA_ID_TRACKMAXCACHE,        EBML_NONE },
347
    { MATROSKA_ID_TRACKMAXBLKADDID,     EBML_NONE },
348
    { 0 }
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};
350

    
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static EbmlSyntax matroska_tracks[] = {
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    { MATROSKA_ID_TRACKENTRY,         EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
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    { 0 }
354
};
355

    
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static EbmlSyntax matroska_attachment[] = {
357
    { MATROSKA_ID_FILEUID,            EBML_UINT, 0, offsetof(MatroskaAttachement,uid) },
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    { MATROSKA_ID_FILENAME,           EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
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    { MATROSKA_ID_FILEMIMETYPE,       EBML_STR,  0, offsetof(MatroskaAttachement,mime) },
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    { MATROSKA_ID_FILEDATA,           EBML_BIN,  0, offsetof(MatroskaAttachement,bin) },
361
    { MATROSKA_ID_FILEDESC,           EBML_NONE },
362
    { 0 }
363
};
364

    
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static EbmlSyntax matroska_attachments[] = {
366
    { MATROSKA_ID_ATTACHEDFILE,       EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
367
    { 0 }
368
};
369

    
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static EbmlSyntax matroska_chapter_display[] = {
371
    { MATROSKA_ID_CHAPSTRING,         EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
372
    { MATROSKA_ID_CHAPLANG,           EBML_NONE },
373
    { 0 }
374
};
375

    
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static EbmlSyntax matroska_chapter_entry[] = {
377
    { MATROSKA_ID_CHAPTERTIMESTART,   EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
378
    { MATROSKA_ID_CHAPTERTIMEEND,     EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
379
    { MATROSKA_ID_CHAPTERUID,         EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
380
    { MATROSKA_ID_CHAPTERDISPLAY,     EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
381
    { MATROSKA_ID_CHAPTERFLAGHIDDEN,  EBML_NONE },
382
    { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
383
    { MATROSKA_ID_CHAPTERPHYSEQUIV,   EBML_NONE },
384
    { MATROSKA_ID_CHAPTERATOM,        EBML_NONE },
385
    { 0 }
386
};
387

    
388
static EbmlSyntax matroska_chapter[] = {
389
    { MATROSKA_ID_CHAPTERATOM,        EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
390
    { MATROSKA_ID_EDITIONUID,         EBML_NONE },
391
    { MATROSKA_ID_EDITIONFLAGHIDDEN,  EBML_NONE },
392
    { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
393
    { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
394
    { 0 }
395
};
396

    
397
static EbmlSyntax matroska_chapters[] = {
398
    { MATROSKA_ID_EDITIONENTRY,       EBML_NEST, 0, 0, {.n=matroska_chapter} },
399
    { 0 }
400
};
401

    
402
static EbmlSyntax matroska_index_pos[] = {
403
    { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
404
    { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos)   },
405
    { MATROSKA_ID_CUEBLOCKNUMBER,     EBML_NONE },
406
    { 0 }
407
};
408

    
409
static EbmlSyntax matroska_index_entry[] = {
410
    { MATROSKA_ID_CUETIME,            EBML_UINT, 0, offsetof(MatroskaIndex,time) },
411
    { MATROSKA_ID_CUETRACKPOSITION,   EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
412
    { 0 }
413
};
414

    
415
static EbmlSyntax matroska_index[] = {
416
    { MATROSKA_ID_POINTENTRY,         EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
417
    { 0 }
418
};
419

    
420
static EbmlSyntax matroska_simpletag[] = {
421
    { MATROSKA_ID_TAGNAME,            EBML_UTF8, 0, offsetof(MatroskaTag,name) },
422
    { MATROSKA_ID_TAGSTRING,          EBML_UTF8, 0, offsetof(MatroskaTag,string) },
423
    { MATROSKA_ID_TAGLANG,            EBML_STR,  0, offsetof(MatroskaTag,lang), {.s="und"} },
424
    { MATROSKA_ID_TAGDEFAULT,         EBML_UINT, 0, offsetof(MatroskaTag,def) },
425
    { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
426
    { 0 }
427
};
428

    
429
static EbmlSyntax matroska_tagtargets[] = {
430
    { MATROSKA_ID_TAGTARGETS_TYPE,      EBML_STR,  0, offsetof(MatroskaTagTarget,type) },
431
    { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget,typevalue), {.u=50} },
432
    { MATROSKA_ID_TAGTARGETS_TRACKUID,  EBML_UINT, 0, offsetof(MatroskaTagTarget,trackuid) },
433
    { MATROSKA_ID_TAGTARGETS_CHAPTERUID,EBML_UINT, 0, offsetof(MatroskaTagTarget,chapteruid) },
434
    { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,attachuid) },
435
    { 0 }
436
};
437

    
438
static EbmlSyntax matroska_tag[] = {
439
    { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags,tag), {.n=matroska_simpletag} },
440
    { MATROSKA_ID_TAGTARGETS,         EBML_NEST, 0, offsetof(MatroskaTags,target), {.n=matroska_tagtargets} },
441
    { 0 }
442
};
443

    
444
static EbmlSyntax matroska_tags[] = {
445
    { MATROSKA_ID_TAG,                EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
446
    { 0 }
447
};
448

    
449
static EbmlSyntax matroska_seekhead_entry[] = {
450
    { MATROSKA_ID_SEEKID,             EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
451
    { MATROSKA_ID_SEEKPOSITION,       EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
452
    { 0 }
453
};
454

    
455
static EbmlSyntax matroska_seekhead[] = {
456
    { MATROSKA_ID_SEEKENTRY,          EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
457
    { 0 }
458
};
459

    
460
static EbmlSyntax matroska_segment[] = {
461
    { MATROSKA_ID_INFO,           EBML_NEST, 0, 0, {.n=matroska_info       } },
462
    { MATROSKA_ID_TRACKS,         EBML_NEST, 0, 0, {.n=matroska_tracks     } },
463
    { MATROSKA_ID_ATTACHMENTS,    EBML_NEST, 0, 0, {.n=matroska_attachments} },
464
    { MATROSKA_ID_CHAPTERS,       EBML_NEST, 0, 0, {.n=matroska_chapters   } },
465
    { MATROSKA_ID_CUES,           EBML_NEST, 0, 0, {.n=matroska_index      } },
466
    { MATROSKA_ID_TAGS,           EBML_NEST, 0, 0, {.n=matroska_tags       } },
467
    { MATROSKA_ID_SEEKHEAD,       EBML_NEST, 0, 0, {.n=matroska_seekhead   } },
468
    { MATROSKA_ID_CLUSTER,        EBML_STOP, 0, offsetof(MatroskaDemuxContext,has_cluster_id) },
469
    { 0 }
470
};
471

    
472
static EbmlSyntax matroska_segments[] = {
473
    { MATROSKA_ID_SEGMENT,        EBML_NEST, 0, 0, {.n=matroska_segment    } },
474
    { 0 }
475
};
476

    
477
static EbmlSyntax matroska_blockgroup[] = {
478
    { MATROSKA_ID_BLOCK,          EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
479
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
480
    { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
481
    { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
482
    { 0 }
483
};
484

    
485
static EbmlSyntax matroska_cluster[] = {
486
    { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
487
    { MATROSKA_ID_BLOCKGROUP,     EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
488
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
489
    { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
490
    { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
491
    { 0 }
492
};
493

    
494
static EbmlSyntax matroska_clusters[] = {
495
    { MATROSKA_ID_CLUSTER,        EBML_NEST, 0, 0, {.n=matroska_cluster} },
496
    { MATROSKA_ID_INFO,           EBML_NONE },
497
    { MATROSKA_ID_CUES,           EBML_NONE },
498
    { MATROSKA_ID_TAGS,           EBML_NONE },
499
    { MATROSKA_ID_SEEKHEAD,       EBML_NONE },
500
    { 0 }
501
};
502

    
503
/*
504
 * Return: Whether we reached the end of a level in the hierarchy or not.
505
 */
506
static int ebml_level_end(MatroskaDemuxContext *matroska)
507
{
508
    ByteIOContext *pb = matroska->ctx->pb;
509
    int64_t pos = url_ftell(pb);
510

    
511
    if (matroska->num_levels > 0) {
512
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
513
        if (pos - level->start >= level->length) {
514
            matroska->num_levels--;
515
            return 1;
516
        }
517
    }
518
    return 0;
519
}
520

    
521
/*
522
 * Read: an "EBML number", which is defined as a variable-length
523
 * array of bytes. The first byte indicates the length by giving a
524
 * number of 0-bits followed by a one. The position of the first
525
 * "one" bit inside the first byte indicates the length of this
526
 * number.
527
 * Returns: number of bytes read, < 0 on error
528
 */
529
static int ebml_read_num(MatroskaDemuxContext *matroska, ByteIOContext *pb,
530
                         int max_size, uint64_t *number)
531
{
532
    int len_mask = 0x80, read = 1, n = 1;
533
    int64_t total = 0;
534

    
535
    /* The first byte tells us the length in bytes - get_byte() can normally
536
     * return 0, but since that's not a valid first ebmlID byte, we can
537
     * use it safely here to catch EOS. */
538
    if (!(total = get_byte(pb))) {
539
        /* we might encounter EOS here */
540
        if (!url_feof(pb)) {
541
            int64_t pos = url_ftell(pb);
542
            av_log(matroska->ctx, AV_LOG_ERROR,
543
                   "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
544
                   pos, pos);
545
        }
546
        return AVERROR(EIO); /* EOS or actual I/O error */
547
    }
548

    
549
    /* get the length of the EBML number */
550
    while (read <= max_size && !(total & len_mask)) {
551
        read++;
552
        len_mask >>= 1;
553
    }
554
    if (read > max_size) {
555
        int64_t pos = url_ftell(pb) - 1;
556
        av_log(matroska->ctx, AV_LOG_ERROR,
557
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
558
               (uint8_t) total, pos, pos);
559
        return AVERROR_INVALIDDATA;
560
    }
561

    
562
    /* read out length */
563
    total &= ~len_mask;
564
    while (n++ < read)
565
        total = (total << 8) | get_byte(pb);
566

    
567
    *number = total;
568

    
569
    return read;
570
}
571

    
572
/*
573
 * Read the next element as an unsigned int.
574
 * 0 is success, < 0 is failure.
575
 */
576
static int ebml_read_uint(ByteIOContext *pb, int size, uint64_t *num)
577
{
578
    int n = 0;
579

    
580
    if (size < 1 || size > 8)
581
        return AVERROR_INVALIDDATA;
582

    
583
    /* big-endian ordering; build up number */
584
    *num = 0;
585
    while (n++ < size)
586
        *num = (*num << 8) | get_byte(pb);
587

    
588
    return 0;
589
}
590

    
591
/*
592
 * Read the next element as a float.
593
 * 0 is success, < 0 is failure.
594
 */
595
static int ebml_read_float(ByteIOContext *pb, int size, double *num)
596
{
597
    if (size == 4) {
598
        *num= av_int2flt(get_be32(pb));
599
    } else if(size==8){
600
        *num= av_int2dbl(get_be64(pb));
601
    } else
602
        return AVERROR_INVALIDDATA;
603

    
604
    return 0;
605
}
606

    
607
/*
608
 * Read the next element as an ASCII string.
609
 * 0 is success, < 0 is failure.
610
 */
611
static int ebml_read_ascii(ByteIOContext *pb, int size, char **str)
612
{
613
    av_free(*str);
614
    /* EBML strings are usually not 0-terminated, so we allocate one
615
     * byte more, read the string and NULL-terminate it ourselves. */
616
    if (!(*str = av_malloc(size + 1)))
617
        return AVERROR(ENOMEM);
618
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
619
        av_free(*str);
620
        return AVERROR(EIO);
621
    }
622
    (*str)[size] = '\0';
623

    
624
    return 0;
625
}
626

    
627
/*
628
 * Read the next element as binary data.
629
 * 0 is success, < 0 is failure.
630
 */
631
static int ebml_read_binary(ByteIOContext *pb, int length, EbmlBin *bin)
632
{
633
    av_free(bin->data);
634
    if (!(bin->data = av_malloc(length)))
635
        return AVERROR(ENOMEM);
636

    
637
    bin->size = length;
638
    bin->pos  = url_ftell(pb);
639
    if (get_buffer(pb, bin->data, length) != length)
640
        return AVERROR(EIO);
641

    
642
    return 0;
643
}
644

    
645
/*
646
 * Read the next element, but only the header. The contents
647
 * are supposed to be sub-elements which can be read separately.
648
 * 0 is success, < 0 is failure.
649
 */
650
static int ebml_read_master(MatroskaDemuxContext *matroska, int length)
651
{
652
    ByteIOContext *pb = matroska->ctx->pb;
653
    MatroskaLevel *level;
654

    
655
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
656
        av_log(matroska->ctx, AV_LOG_ERROR,
657
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
658
        return AVERROR(ENOSYS);
659
    }
660

    
661
    level = &matroska->levels[matroska->num_levels++];
662
    level->start = url_ftell(pb);
663
    level->length = length;
664

    
665
    return 0;
666
}
667

    
668
/*
669
 * Read signed/unsigned "EBML" numbers.
670
 * Return: number of bytes processed, < 0 on error
671
 */
672
static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
673
                                 uint8_t *data, uint32_t size, uint64_t *num)
674
{
675
    ByteIOContext pb;
676
    init_put_byte(&pb, data, size, 0, NULL, NULL, NULL, NULL);
677
    return ebml_read_num(matroska, &pb, 8, num);
678
}
679

    
680
/*
681
 * Same as above, but signed.
682
 */
683
static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
684
                                 uint8_t *data, uint32_t size, int64_t *num)
685
{
686
    uint64_t unum;
687
    int res;
688

    
689
    /* read as unsigned number first */
690
    if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
691
        return res;
692

    
693
    /* make signed (weird way) */
694
    *num = unum - ((1LL << (7*res - 1)) - 1);
695

    
696
    return res;
697
}
698

    
699
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
700
                           EbmlSyntax *syntax, void *data);
701

    
702
static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
703
                         uint32_t id, void *data)
704
{
705
    int i;
706
    for (i=0; syntax[i].id; i++)
707
        if (id == syntax[i].id)
708
            break;
709
    if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
710
        av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
711
    return ebml_parse_elem(matroska, &syntax[i], data);
712
}
713

    
714
static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
715
                      void *data)
716
{
717
    uint64_t id;
718
    int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
719
    id |= 1 << 7*res;
720
    return res < 0 ? res : ebml_parse_id(matroska, syntax, id, data);
721
}
722

    
723
static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
724
                           void *data)
725
{
726
    int i, res = 0;
727

    
728
    for (i=0; syntax[i].id; i++)
729
        switch (syntax[i].type) {
730
        case EBML_UINT:
731
            *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
732
            break;
733
        case EBML_FLOAT:
734
            *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
735
            break;
736
        case EBML_STR:
737
        case EBML_UTF8:
738
            *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
739
            break;
740
        }
741

    
742
    while (!res && !ebml_level_end(matroska))
743
        res = ebml_parse(matroska, syntax, data);
744

    
745
    return res;
746
}
747

    
748
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
749
                           EbmlSyntax *syntax, void *data)
750
{
751
    ByteIOContext *pb = matroska->ctx->pb;
752
    uint32_t id = syntax->id;
753
    uint64_t length;
754
    int res;
755

    
756
    data = (char *)data + syntax->data_offset;
757
    if (syntax->list_elem_size) {
758
        EbmlList *list = data;
759
        list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
760
        data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
761
        memset(data, 0, syntax->list_elem_size);
762
        list->nb_elem++;
763
    }
764

    
765
    if (syntax->type != EBML_PASS && syntax->type != EBML_STOP)
766
        if ((res = ebml_read_num(matroska, pb, 8, &length)) < 0)
767
            return res;
768

    
769
    switch (syntax->type) {
770
    case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
771
    case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
772
    case EBML_STR:
773
    case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
774
    case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
775
    case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
776
                         return res;
777
                     if (id == MATROSKA_ID_SEGMENT)
778
                         matroska->segment_start = url_ftell(matroska->ctx->pb);
779
                     return ebml_parse_nest(matroska, syntax->def.n, data);
780
    case EBML_PASS:  return ebml_parse_id(matroska, syntax->def.n, id, data);
781
    case EBML_STOP:  *(int *)data = 1;      return 1;
782
    default:         return url_fseek(pb,length,SEEK_CUR)<0 ? AVERROR(EIO) : 0;
783
    }
784
    if (res == AVERROR_INVALIDDATA)
785
        av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
786
    else if (res == AVERROR(EIO))
787
        av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
788
    return res;
789
}
790

    
791
static void ebml_free(EbmlSyntax *syntax, void *data)
792
{
793
    int i, j;
794
    for (i=0; syntax[i].id; i++) {
795
        void *data_off = (char *)data + syntax[i].data_offset;
796
        switch (syntax[i].type) {
797
        case EBML_STR:
798
        case EBML_UTF8:  av_freep(data_off);                      break;
799
        case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
800
        case EBML_NEST:
801
            if (syntax[i].list_elem_size) {
802
                EbmlList *list = data_off;
803
                char *ptr = list->elem;
804
                for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
805
                    ebml_free(syntax[i].def.n, ptr);
806
                av_free(list->elem);
807
            } else
808
                ebml_free(syntax[i].def.n, data_off);
809
        default:  break;
810
        }
811
    }
812
}
813

    
814

    
815
/*
816
 * Autodetecting...
817
 */
818
static int matroska_probe(AVProbeData *p)
819
{
820
    uint64_t total = 0;
821
    int len_mask = 0x80, size = 1, n = 1;
822
    static const char probe_data[] = "matroska";
823

    
824
    /* EBML header? */
825
    if (AV_RB32(p->buf) != EBML_ID_HEADER)
826
        return 0;
827

    
828
    /* length of header */
829
    total = p->buf[4];
830
    while (size <= 8 && !(total & len_mask)) {
831
        size++;
832
        len_mask >>= 1;
833
    }
834
    if (size > 8)
835
      return 0;
836
    total &= (len_mask - 1);
837
    while (n < size)
838
        total = (total << 8) | p->buf[4 + n++];
839

    
840
    /* Does the probe data contain the whole header? */
841
    if (p->buf_size < 4 + size + total)
842
      return 0;
843

    
844
    /* The header must contain the document type 'matroska'. For now,
845
     * we don't parse the whole header but simply check for the
846
     * availability of that array of characters inside the header.
847
     * Not fully fool-proof, but good enough. */
848
    for (n = 4+size; n <= 4+size+total-(sizeof(probe_data)-1); n++)
849
        if (!memcmp(p->buf+n, probe_data, sizeof(probe_data)-1))
850
            return AVPROBE_SCORE_MAX;
851

    
852
    return 0;
853
}
854

    
855
static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
856
                                                 int num)
857
{
858
    MatroskaTrack *tracks = matroska->tracks.elem;
859
    int i;
860

    
861
    for (i=0; i < matroska->tracks.nb_elem; i++)
862
        if (tracks[i].num == num)
863
            return &tracks[i];
864

    
865
    av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
866
    return NULL;
867
}
868

    
869
static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
870
                                  MatroskaTrack *track)
871
{
872
    MatroskaTrackEncoding *encodings = track->encodings.elem;
873
    uint8_t* data = *buf;
874
    int isize = *buf_size;
875
    uint8_t* pkt_data = NULL;
876
    int pkt_size = isize;
877
    int result = 0;
878
    int olen;
879

    
880
    switch (encodings[0].compression.algo) {
881
    case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
882
        return encodings[0].compression.settings.size;
883
    case MATROSKA_TRACK_ENCODING_COMP_LZO:
884
        do {
885
            olen = pkt_size *= 3;
886
            pkt_data = av_realloc(pkt_data, pkt_size+AV_LZO_OUTPUT_PADDING);
887
            result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
888
        } while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
889
        if (result)
890
            goto failed;
891
        pkt_size -= olen;
892
        break;
893
#if CONFIG_ZLIB
894
    case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
895
        z_stream zstream = {0};
896
        if (inflateInit(&zstream) != Z_OK)
897
            return -1;
898
        zstream.next_in = data;
899
        zstream.avail_in = isize;
900
        do {
901
            pkt_size *= 3;
902
            pkt_data = av_realloc(pkt_data, pkt_size);
903
            zstream.avail_out = pkt_size - zstream.total_out;
904
            zstream.next_out = pkt_data + zstream.total_out;
905
            result = inflate(&zstream, Z_NO_FLUSH);
906
        } while (result==Z_OK && pkt_size<10000000);
907
        pkt_size = zstream.total_out;
908
        inflateEnd(&zstream);
909
        if (result != Z_STREAM_END)
910
            goto failed;
911
        break;
912
    }
913
#endif
914
#if CONFIG_BZLIB
915
    case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
916
        bz_stream bzstream = {0};
917
        if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
918
            return -1;
919
        bzstream.next_in = data;
920
        bzstream.avail_in = isize;
921
        do {
922
            pkt_size *= 3;
923
            pkt_data = av_realloc(pkt_data, pkt_size);
924
            bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
925
            bzstream.next_out = pkt_data + bzstream.total_out_lo32;
926
            result = BZ2_bzDecompress(&bzstream);
927
        } while (result==BZ_OK && pkt_size<10000000);
928
        pkt_size = bzstream.total_out_lo32;
929
        BZ2_bzDecompressEnd(&bzstream);
930
        if (result != BZ_STREAM_END)
931
            goto failed;
932
        break;
933
    }
934
#endif
935
    default:
936
        return -1;
937
    }
938

    
939
    *buf = pkt_data;
940
    *buf_size = pkt_size;
941
    return 0;
942
 failed:
943
    av_free(pkt_data);
944
    return -1;
945
}
946

    
947
static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
948
                                    AVPacket *pkt, uint64_t display_duration)
949
{
950
    char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
951
    for (; *ptr!=',' && ptr<end-1; ptr++);
952
    if (*ptr == ',')
953
        layer = ++ptr;
954
    for (; *ptr!=',' && ptr<end-1; ptr++);
955
    if (*ptr == ',') {
956
        int64_t end_pts = pkt->pts + display_duration;
957
        int sc = matroska->time_scale * pkt->pts / 10000000;
958
        int ec = matroska->time_scale * end_pts  / 10000000;
959
        int sh, sm, ss, eh, em, es, len;
960
        sh = sc/360000;  sc -= 360000*sh;
961
        sm = sc/  6000;  sc -=   6000*sm;
962
        ss = sc/   100;  sc -=    100*ss;
963
        eh = ec/360000;  ec -= 360000*eh;
964
        em = ec/  6000;  ec -=   6000*em;
965
        es = ec/   100;  ec -=    100*es;
966
        *ptr++ = '\0';
967
        len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
968
        if (!(line = av_malloc(len)))
969
            return;
970
        snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
971
                 layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
972
        av_free(pkt->data);
973
        pkt->data = line;
974
        pkt->size = strlen(line);
975
    }
976
}
977

    
978
static void matroska_merge_packets(AVPacket *out, AVPacket *in)
979
{
980
    out->data = av_realloc(out->data, out->size+in->size);
981
    memcpy(out->data+out->size, in->data, in->size);
982
    out->size += in->size;
983
    av_destruct_packet(in);
984
    av_free(in);
985
}
986

    
987
static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
988
                                 AVMetadata **metadata, char *prefix)
989
{
990
    MatroskaTag *tags = list->elem;
991
    char key[1024];
992
    int i;
993

    
994
    for (i=0; i < list->nb_elem; i++) {
995
        const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
996
        if (prefix)  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
997
        else         av_strlcpy(key, tags[i].name, sizeof(key));
998
        if (tags[i].def || !lang) {
999
        av_metadata_set(metadata, key, tags[i].string);
1000
        if (tags[i].sub.nb_elem)
1001
            matroska_convert_tag(s, &tags[i].sub, metadata, key);
1002
        }
1003
        if (lang) {
1004
            av_strlcat(key, "-", sizeof(key));
1005
            av_strlcat(key, lang, sizeof(key));
1006
            av_metadata_set(metadata, key, tags[i].string);
1007
            if (tags[i].sub.nb_elem)
1008
                matroska_convert_tag(s, &tags[i].sub, metadata, key);
1009
        }
1010
    }
1011
}
1012

    
1013
static void matroska_convert_tags(AVFormatContext *s)
1014
{
1015
    MatroskaDemuxContext *matroska = s->priv_data;
1016
    MatroskaTags *tags = matroska->tags.elem;
1017
    int i, j;
1018

    
1019
    for (i=0; i < matroska->tags.nb_elem; i++) {
1020
        if (tags[i].target.attachuid) {
1021
            MatroskaAttachement *attachment = matroska->attachments.elem;
1022
            for (j=0; j<matroska->attachments.nb_elem; j++)
1023
                if (attachment[j].uid == tags[i].target.attachuid)
1024
                    matroska_convert_tag(s, &tags[i].tag,
1025
                                         &attachment[j].stream->metadata, NULL);
1026
        } else if (tags[i].target.chapteruid) {
1027
            MatroskaChapter *chapter = matroska->chapters.elem;
1028
            for (j=0; j<matroska->chapters.nb_elem; j++)
1029
                if (chapter[j].uid == tags[i].target.chapteruid)
1030
                    matroska_convert_tag(s, &tags[i].tag,
1031
                                         &chapter[j].chapter->metadata, NULL);
1032
        } else if (tags[i].target.trackuid) {
1033
            MatroskaTrack *track = matroska->tracks.elem;
1034
            for (j=0; j<matroska->tracks.nb_elem; j++)
1035
                if (track[j].uid == tags[i].target.trackuid)
1036
                    matroska_convert_tag(s, &tags[i].tag,
1037
                                         &track[j].stream->metadata, NULL);
1038
        } else {
1039
            matroska_convert_tag(s, &tags[i].tag, &s->metadata, NULL);
1040
        }
1041
    }
1042
}
1043

    
1044
static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1045
{
1046
    EbmlList *seekhead_list = &matroska->seekhead;
1047
    MatroskaSeekhead *seekhead = seekhead_list->elem;
1048
    uint32_t level_up = matroska->level_up;
1049
    int64_t before_pos = url_ftell(matroska->ctx->pb);
1050
    MatroskaLevel level;
1051
    int i;
1052

    
1053
    for (i=0; i<seekhead_list->nb_elem; i++) {
1054
        int64_t offset = seekhead[i].pos + matroska->segment_start;
1055

    
1056
        if (seekhead[i].pos <= before_pos
1057
            || seekhead[i].id == MATROSKA_ID_SEEKHEAD
1058
            || seekhead[i].id == MATROSKA_ID_CLUSTER)
1059
            continue;
1060

    
1061
        /* seek */
1062
        if (url_fseek(matroska->ctx->pb, offset, SEEK_SET) != offset)
1063
            continue;
1064

    
1065
        /* We don't want to lose our seekhead level, so we add
1066
         * a dummy. This is a crude hack. */
1067
        if (matroska->num_levels == EBML_MAX_DEPTH) {
1068
            av_log(matroska->ctx, AV_LOG_INFO,
1069
                   "Max EBML element depth (%d) reached, "
1070
                   "cannot parse further.\n", EBML_MAX_DEPTH);
1071
            break;
1072
        }
1073

    
1074
        level.start = 0;
1075
        level.length = (uint64_t)-1;
1076
        matroska->levels[matroska->num_levels] = level;
1077
        matroska->num_levels++;
1078

    
1079
        ebml_parse(matroska, matroska_segment, matroska);
1080

    
1081
        /* remove dummy level */
1082
        while (matroska->num_levels) {
1083
            uint64_t length = matroska->levels[--matroska->num_levels].length;
1084
            if (length == (uint64_t)-1)
1085
                break;
1086
        }
1087
    }
1088

    
1089
    /* seek back */
1090
    url_fseek(matroska->ctx->pb, before_pos, SEEK_SET);
1091
    matroska->level_up = level_up;
1092
}
1093

    
1094
static int matroska_aac_profile(char *codec_id)
1095
{
1096
    static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1097
    int profile;
1098

    
1099
    for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1100
        if (strstr(codec_id, aac_profiles[profile]))
1101
            break;
1102
    return profile + 1;
1103
}
1104

    
1105
static int matroska_aac_sri(int samplerate)
1106
{
1107
    int sri;
1108

    
1109
    for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
1110
        if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1111
            break;
1112
    return sri;
1113
}
1114

    
1115
static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1116
{
1117
    MatroskaDemuxContext *matroska = s->priv_data;
1118
    EbmlList *attachements_list = &matroska->attachments;
1119
    MatroskaAttachement *attachements;
1120
    EbmlList *chapters_list = &matroska->chapters;
1121
    MatroskaChapter *chapters;
1122
    MatroskaTrack *tracks;
1123
    EbmlList *index_list;
1124
    MatroskaIndex *index;
1125
    int index_scale = 1;
1126
    uint64_t max_start = 0;
1127
    Ebml ebml = { 0 };
1128
    AVStream *st;
1129
    int i, j;
1130

    
1131
    matroska->ctx = s;
1132

    
1133
    /* First read the EBML header. */
1134
    if (ebml_parse(matroska, ebml_syntax, &ebml)
1135
        || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1136
        || ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
1137
        || ebml.doctype_version > 2) {
1138
        av_log(matroska->ctx, AV_LOG_ERROR,
1139
               "EBML header using unsupported features\n"
1140
               "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1141
               ebml.version, ebml.doctype, ebml.doctype_version);
1142
        return AVERROR_NOFMT;
1143
    }
1144
    ebml_free(ebml_syntax, &ebml);
1145

    
1146
    /* The next thing is a segment. */
1147
    if (ebml_parse(matroska, matroska_segments, matroska) < 0)
1148
        return -1;
1149
    matroska_execute_seekhead(matroska);
1150

    
1151
    if (matroska->duration)
1152
        matroska->ctx->duration = matroska->duration * matroska->time_scale
1153
                                  * 1000 / AV_TIME_BASE;
1154
    av_metadata_set(&s->metadata, "title", matroska->title);
1155

    
1156
    tracks = matroska->tracks.elem;
1157
    for (i=0; i < matroska->tracks.nb_elem; i++) {
1158
        MatroskaTrack *track = &tracks[i];
1159
        enum CodecID codec_id = CODEC_ID_NONE;
1160
        EbmlList *encodings_list = &tracks->encodings;
1161
        MatroskaTrackEncoding *encodings = encodings_list->elem;
1162
        uint8_t *extradata = NULL;
1163
        int extradata_size = 0;
1164
        int extradata_offset = 0;
1165
        ByteIOContext b;
1166

    
1167
        /* Apply some sanity checks. */
1168
        if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1169
            track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1170
            track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1171
            av_log(matroska->ctx, AV_LOG_INFO,
1172
                   "Unknown or unsupported track type %"PRIu64"\n",
1173
                   track->type);
1174
            continue;
1175
        }
1176
        if (track->codec_id == NULL)
1177
            continue;
1178

    
1179
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1180
            if (!track->default_duration)
1181
                track->default_duration = 1000000000/track->video.frame_rate;
1182
            if (!track->video.display_width)
1183
                track->video.display_width = track->video.pixel_width;
1184
            if (!track->video.display_height)
1185
                track->video.display_height = track->video.pixel_height;
1186
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1187
            if (!track->audio.out_samplerate)
1188
                track->audio.out_samplerate = track->audio.samplerate;
1189
        }
1190
        if (encodings_list->nb_elem > 1) {
1191
            av_log(matroska->ctx, AV_LOG_ERROR,
1192
                   "Multiple combined encodings no supported");
1193
        } else if (encodings_list->nb_elem == 1) {
1194
            if (encodings[0].type ||
1195
                (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1196
#if CONFIG_ZLIB
1197
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1198
#endif
1199
#if CONFIG_BZLIB
1200
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1201
#endif
1202
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1203
                encodings[0].scope = 0;
1204
                av_log(matroska->ctx, AV_LOG_ERROR,
1205
                       "Unsupported encoding type");
1206
            } else if (track->codec_priv.size && encodings[0].scope&2) {
1207
                uint8_t *codec_priv = track->codec_priv.data;
1208
                int offset = matroska_decode_buffer(&track->codec_priv.data,
1209
                                                    &track->codec_priv.size,
1210
                                                    track);
1211
                if (offset < 0) {
1212
                    track->codec_priv.data = NULL;
1213
                    track->codec_priv.size = 0;
1214
                    av_log(matroska->ctx, AV_LOG_ERROR,
1215
                           "Failed to decode codec private data\n");
1216
                } else if (offset > 0) {
1217
                    track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1218
                    memcpy(track->codec_priv.data,
1219
                           encodings[0].compression.settings.data, offset);
1220
                    memcpy(track->codec_priv.data+offset, codec_priv,
1221
                           track->codec_priv.size);
1222
                    track->codec_priv.size += offset;
1223
                }
1224
                if (codec_priv != track->codec_priv.data)
1225
                    av_free(codec_priv);
1226
            }
1227
        }
1228

    
1229
        for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1230
            if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1231
                        strlen(ff_mkv_codec_tags[j].str))){
1232
                codec_id= ff_mkv_codec_tags[j].id;
1233
                break;
1234
            }
1235
        }
1236

    
1237
        st = track->stream = av_new_stream(s, 0);
1238
        if (st == NULL)
1239
            return AVERROR(ENOMEM);
1240

    
1241
        if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1242
            && track->codec_priv.size >= 40
1243
            && track->codec_priv.data != NULL) {
1244
            track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1245
            codec_id = codec_get_id(codec_bmp_tags, track->video.fourcc);
1246
        } else if (!strcmp(track->codec_id, "A_MS/ACM")
1247
                   && track->codec_priv.size >= 18
1248
                   && track->codec_priv.data != NULL) {
1249
            init_put_byte(&b, track->codec_priv.data, track->codec_priv.size,
1250
                          URL_RDONLY, NULL, NULL, NULL, NULL);
1251
            get_wav_header(&b, st->codec, track->codec_priv.size);
1252
            codec_id = st->codec->codec_id;
1253
            extradata_offset = 18;
1254
            track->codec_priv.size -= extradata_offset;
1255
        } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1256
                   && (track->codec_priv.size >= 86)
1257
                   && (track->codec_priv.data != NULL)) {
1258
            track->video.fourcc = AV_RL32(track->codec_priv.data);
1259
            codec_id=codec_get_id(codec_movvideo_tags, track->video.fourcc);
1260
        } else if (codec_id == CODEC_ID_PCM_S16BE) {
1261
            switch (track->audio.bitdepth) {
1262
            case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1263
            case 24:  codec_id = CODEC_ID_PCM_S24BE;  break;
1264
            case 32:  codec_id = CODEC_ID_PCM_S32BE;  break;
1265
            }
1266
        } else if (codec_id == CODEC_ID_PCM_S16LE) {
1267
            switch (track->audio.bitdepth) {
1268
            case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1269
            case 24:  codec_id = CODEC_ID_PCM_S24LE;  break;
1270
            case 32:  codec_id = CODEC_ID_PCM_S32LE;  break;
1271
            }
1272
        } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1273
            codec_id = CODEC_ID_PCM_F64LE;
1274
        } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1275
            int profile = matroska_aac_profile(track->codec_id);
1276
            int sri = matroska_aac_sri(track->audio.samplerate);
1277
            extradata = av_malloc(5);
1278
            if (extradata == NULL)
1279
                return AVERROR(ENOMEM);
1280
            extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1281
            extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1282
            if (strstr(track->codec_id, "SBR")) {
1283
                sri = matroska_aac_sri(track->audio.out_samplerate);
1284
                extradata[2] = 0x56;
1285
                extradata[3] = 0xE5;
1286
                extradata[4] = 0x80 | (sri<<3);
1287
                extradata_size = 5;
1288
            } else
1289
                extradata_size = 2;
1290
        } else if (codec_id == CODEC_ID_TTA) {
1291
            extradata_size = 30;
1292
            extradata = av_mallocz(extradata_size);
1293
            if (extradata == NULL)
1294
                return AVERROR(ENOMEM);
1295
            init_put_byte(&b, extradata, extradata_size, 1,
1296
                          NULL, NULL, NULL, NULL);
1297
            put_buffer(&b, "TTA1", 4);
1298
            put_le16(&b, 1);
1299
            put_le16(&b, track->audio.channels);
1300
            put_le16(&b, track->audio.bitdepth);
1301
            put_le32(&b, track->audio.out_samplerate);
1302
            put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1303
        } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1304
                   codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1305
            extradata_offset = 26;
1306
            track->codec_priv.size -= extradata_offset;
1307
        } else if (codec_id == CODEC_ID_RA_144) {
1308
            track->audio.out_samplerate = 8000;
1309
            track->audio.channels = 1;
1310
        } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1311
                   codec_id == CODEC_ID_ATRAC3) {
1312
            init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1313
                          0, NULL, NULL, NULL, NULL);
1314
            url_fskip(&b, 24);
1315
            track->audio.coded_framesize = get_be32(&b);
1316
            url_fskip(&b, 12);
1317
            track->audio.sub_packet_h    = get_be16(&b);
1318
            track->audio.frame_size      = get_be16(&b);
1319
            track->audio.sub_packet_size = get_be16(&b);
1320
            track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1321
            if (codec_id == CODEC_ID_RA_288) {
1322
                st->codec->block_align = track->audio.coded_framesize;
1323
                track->codec_priv.size = 0;
1324
            } else {
1325
                st->codec->block_align = track->audio.sub_packet_size;
1326
                extradata_offset = 78;
1327
                track->codec_priv.size -= extradata_offset;
1328
            }
1329
        }
1330

    
1331
        if (codec_id == CODEC_ID_NONE)
1332
            av_log(matroska->ctx, AV_LOG_INFO,
1333
                   "Unknown/unsupported CodecID %s.\n", track->codec_id);
1334

    
1335
        if (track->time_scale < 0.01)
1336
            track->time_scale = 1.0;
1337
        av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1338

    
1339
        st->codec->codec_id = codec_id;
1340
        st->start_time = 0;
1341
        if (strcmp(track->language, "und"))
1342
            av_metadata_set(&st->metadata, "language", track->language);
1343
        av_metadata_set(&st->metadata, "description", track->name);
1344

    
1345
        if (track->flag_default)
1346
            st->disposition |= AV_DISPOSITION_DEFAULT;
1347

    
1348
        if (track->default_duration)
1349
            av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1350
                      track->default_duration, 1000000000, 30000);
1351

    
1352
        if(extradata){
1353
            st->codec->extradata = extradata;
1354
            st->codec->extradata_size = extradata_size;
1355
        } else if(track->codec_priv.data && track->codec_priv.size > 0){
1356
            st->codec->extradata = av_mallocz(track->codec_priv.size +
1357
                                              FF_INPUT_BUFFER_PADDING_SIZE);
1358
            if(st->codec->extradata == NULL)
1359
                return AVERROR(ENOMEM);
1360
            st->codec->extradata_size = track->codec_priv.size;
1361
            memcpy(st->codec->extradata,
1362
                   track->codec_priv.data + extradata_offset,
1363
                   track->codec_priv.size);
1364
        }
1365

    
1366
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1367
            st->codec->codec_type = CODEC_TYPE_VIDEO;
1368
            st->codec->codec_tag  = track->video.fourcc;
1369
            st->codec->width  = track->video.pixel_width;
1370
            st->codec->height = track->video.pixel_height;
1371
            av_reduce(&st->sample_aspect_ratio.num,
1372
                      &st->sample_aspect_ratio.den,
1373
                      st->codec->height * track->video.display_width,
1374
                      st->codec-> width * track->video.display_height,
1375
                      255);
1376
            st->need_parsing = AVSTREAM_PARSE_HEADERS;
1377
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1378
            st->codec->codec_type = CODEC_TYPE_AUDIO;
1379
            st->codec->sample_rate = track->audio.out_samplerate;
1380
            st->codec->channels = track->audio.channels;
1381
        } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1382
            st->codec->codec_type = CODEC_TYPE_SUBTITLE;
1383
        }
1384
    }
1385

    
1386
    attachements = attachements_list->elem;
1387
    for (j=0; j<attachements_list->nb_elem; j++) {
1388
        if (!(attachements[j].filename && attachements[j].mime &&
1389
              attachements[j].bin.data && attachements[j].bin.size > 0)) {
1390
            av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1391
        } else {
1392
            AVStream *st = av_new_stream(s, 0);
1393
            if (st == NULL)
1394
                break;
1395
            av_metadata_set(&st->metadata, "filename",attachements[j].filename);
1396
            st->codec->codec_id = CODEC_ID_NONE;
1397
            st->codec->codec_type = CODEC_TYPE_ATTACHMENT;
1398
            st->codec->extradata  = av_malloc(attachements[j].bin.size);
1399
            if(st->codec->extradata == NULL)
1400
                break;
1401
            st->codec->extradata_size = attachements[j].bin.size;
1402
            memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1403

    
1404
            for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1405
                if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1406
                             strlen(ff_mkv_mime_tags[i].str))) {
1407
                    st->codec->codec_id = ff_mkv_mime_tags[i].id;
1408
                    break;
1409
                }
1410
            }
1411
            attachements[j].stream = st;
1412
        }
1413
    }
1414

    
1415
    chapters = chapters_list->elem;
1416
    for (i=0; i<chapters_list->nb_elem; i++)
1417
        if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
1418
            && (max_start==0 || chapters[i].start > max_start)) {
1419
            chapters[i].chapter =
1420
            ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1421
                           chapters[i].start, chapters[i].end,
1422
                           chapters[i].title);
1423
            av_metadata_set(&chapters[i].chapter->metadata,
1424
                            "title", chapters[i].title);
1425
            max_start = chapters[i].start;
1426
        }
1427

    
1428
    index_list = &matroska->index;
1429
    index = index_list->elem;
1430
    if (index_list->nb_elem
1431
        && index[0].time > 100000000000000/matroska->time_scale) {
1432
        av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1433
        index_scale = matroska->time_scale;
1434
    }
1435
    for (i=0; i<index_list->nb_elem; i++) {
1436
        EbmlList *pos_list = &index[i].pos;
1437
        MatroskaIndexPos *pos = pos_list->elem;
1438
        for (j=0; j<pos_list->nb_elem; j++) {
1439
            MatroskaTrack *track = matroska_find_track_by_num(matroska,
1440
                                                              pos[j].track);
1441
            if (track && track->stream)
1442
                av_add_index_entry(track->stream,
1443
                                   pos[j].pos + matroska->segment_start,
1444
                                   index[i].time/index_scale, 0, 0,
1445
                                   AVINDEX_KEYFRAME);
1446
        }
1447
    }
1448

    
1449
    matroska_convert_tags(s);
1450

    
1451
    return 0;
1452
}
1453

    
1454
/*
1455
 * Put one packet in an application-supplied AVPacket struct.
1456
 * Returns 0 on success or -1 on failure.
1457
 */
1458
static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1459
                                   AVPacket *pkt)
1460
{
1461
    if (matroska->num_packets > 0) {
1462
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1463
        av_free(matroska->packets[0]);
1464
        if (matroska->num_packets > 1) {
1465
            memmove(&matroska->packets[0], &matroska->packets[1],
1466
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
1467
            matroska->packets =
1468
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
1469
                           sizeof(AVPacket *));
1470
        } else {
1471
            av_freep(&matroska->packets);
1472
        }
1473
        matroska->num_packets--;
1474
        return 0;
1475
    }
1476

    
1477
    return -1;
1478
}
1479

    
1480
/*
1481
 * Free all packets in our internal queue.
1482
 */
1483
static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1484
{
1485
    if (matroska->packets) {
1486
        int n;
1487
        for (n = 0; n < matroska->num_packets; n++) {
1488
            av_free_packet(matroska->packets[n]);
1489
            av_free(matroska->packets[n]);
1490
        }
1491
        av_freep(&matroska->packets);
1492
        matroska->num_packets = 0;
1493
    }
1494
}
1495

    
1496
static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1497
                                int size, int64_t pos, uint64_t cluster_time,
1498
                                uint64_t duration, int is_keyframe,
1499
                                int64_t cluster_pos)
1500
{
1501
    uint64_t timecode = AV_NOPTS_VALUE;
1502
    MatroskaTrack *track;
1503
    int res = 0;
1504
    AVStream *st;
1505
    AVPacket *pkt;
1506
    int16_t block_time;
1507
    uint32_t *lace_size = NULL;
1508
    int n, flags, laces = 0;
1509
    uint64_t num;
1510

    
1511
    if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1512
        av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1513
        return res;
1514
    }
1515
    data += n;
1516
    size -= n;
1517

    
1518
    track = matroska_find_track_by_num(matroska, num);
1519
    if (size <= 3 || !track || !track->stream) {
1520
        av_log(matroska->ctx, AV_LOG_INFO,
1521
               "Invalid stream %"PRIu64" or size %u\n", num, size);
1522
        return res;
1523
    }
1524
    st = track->stream;
1525
    if (st->discard >= AVDISCARD_ALL)
1526
        return res;
1527
    if (duration == AV_NOPTS_VALUE)
1528
        duration = track->default_duration / matroska->time_scale;
1529

    
1530
    block_time = AV_RB16(data);
1531
    data += 2;
1532
    flags = *data++;
1533
    size -= 3;
1534
    if (is_keyframe == -1)
1535
        is_keyframe = flags & 0x80 ? PKT_FLAG_KEY : 0;
1536

    
1537
    if (cluster_time != (uint64_t)-1
1538
        && (block_time >= 0 || cluster_time >= -block_time)) {
1539
        timecode = cluster_time + block_time;
1540
        if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
1541
            && timecode < track->end_timecode)
1542
            is_keyframe = 0;  /* overlapping subtitles are not key frame */
1543
        if (is_keyframe)
1544
            av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
1545
        track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
1546
    }
1547

    
1548
    if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1549
        if (!is_keyframe || timecode < matroska->skip_to_timecode)
1550
            return res;
1551
        matroska->skip_to_keyframe = 0;
1552
    }
1553

    
1554
    switch ((flags & 0x06) >> 1) {
1555
        case 0x0: /* no lacing */
1556
            laces = 1;
1557
            lace_size = av_mallocz(sizeof(int));
1558
            lace_size[0] = size;
1559
            break;
1560

    
1561
        case 0x1: /* Xiph lacing */
1562
        case 0x2: /* fixed-size lacing */
1563
        case 0x3: /* EBML lacing */
1564
            assert(size>0); // size <=3 is checked before size-=3 above
1565
            laces = (*data) + 1;
1566
            data += 1;
1567
            size -= 1;
1568
            lace_size = av_mallocz(laces * sizeof(int));
1569

    
1570
            switch ((flags & 0x06) >> 1) {
1571
                case 0x1: /* Xiph lacing */ {
1572
                    uint8_t temp;
1573
                    uint32_t total = 0;
1574
                    for (n = 0; res == 0 && n < laces - 1; n++) {
1575
                        while (1) {
1576
                            if (size == 0) {
1577
                                res = -1;
1578
                                break;
1579
                            }
1580
                            temp = *data;
1581
                            lace_size[n] += temp;
1582
                            data += 1;
1583
                            size -= 1;
1584
                            if (temp != 0xff)
1585
                                break;
1586
                        }
1587
                        total += lace_size[n];
1588
                    }
1589
                    lace_size[n] = size - total;
1590
                    break;
1591
                }
1592

    
1593
                case 0x2: /* fixed-size lacing */
1594
                    for (n = 0; n < laces; n++)
1595
                        lace_size[n] = size / laces;
1596
                    break;
1597

    
1598
                case 0x3: /* EBML lacing */ {
1599
                    uint32_t total;
1600
                    n = matroska_ebmlnum_uint(matroska, data, size, &num);
1601
                    if (n < 0) {
1602
                        av_log(matroska->ctx, AV_LOG_INFO,
1603
                               "EBML block data error\n");
1604
                        break;
1605
                    }
1606
                    data += n;
1607
                    size -= n;
1608
                    total = lace_size[0] = num;
1609
                    for (n = 1; res == 0 && n < laces - 1; n++) {
1610
                        int64_t snum;
1611
                        int r;
1612
                        r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1613
                        if (r < 0) {
1614
                            av_log(matroska->ctx, AV_LOG_INFO,
1615
                                   "EBML block data error\n");
1616
                            break;
1617
                        }
1618
                        data += r;
1619
                        size -= r;
1620
                        lace_size[n] = lace_size[n - 1] + snum;
1621
                        total += lace_size[n];
1622
                    }
1623
                    lace_size[n] = size - total;
1624
                    break;
1625
                }
1626
            }
1627
            break;
1628
    }
1629

    
1630
    if (res == 0) {
1631
        for (n = 0; n < laces; n++) {
1632
            if (st->codec->codec_id == CODEC_ID_RA_288 ||
1633
                st->codec->codec_id == CODEC_ID_COOK ||
1634
                st->codec->codec_id == CODEC_ID_ATRAC3) {
1635
                int a = st->codec->block_align;
1636
                int sps = track->audio.sub_packet_size;
1637
                int cfs = track->audio.coded_framesize;
1638
                int h = track->audio.sub_packet_h;
1639
                int y = track->audio.sub_packet_cnt;
1640
                int w = track->audio.frame_size;
1641
                int x;
1642

    
1643
                if (!track->audio.pkt_cnt) {
1644
                    if (st->codec->codec_id == CODEC_ID_RA_288)
1645
                        for (x=0; x<h/2; x++)
1646
                            memcpy(track->audio.buf+x*2*w+y*cfs,
1647
                                   data+x*cfs, cfs);
1648
                    else
1649
                        for (x=0; x<w/sps; x++)
1650
                            memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1651

    
1652
                    if (++track->audio.sub_packet_cnt >= h) {
1653
                        track->audio.sub_packet_cnt = 0;
1654
                        track->audio.pkt_cnt = h*w / a;
1655
                    }
1656
                }
1657
                while (track->audio.pkt_cnt) {
1658
                    pkt = av_mallocz(sizeof(AVPacket));
1659
                    av_new_packet(pkt, a);
1660
                    memcpy(pkt->data, track->audio.buf
1661
                           + a * (h*w / a - track->audio.pkt_cnt--), a);
1662
                    pkt->pos = pos;
1663
                    pkt->stream_index = st->index;
1664
                    dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1665
                }
1666
            } else {
1667
                MatroskaTrackEncoding *encodings = track->encodings.elem;
1668
                int offset = 0, pkt_size = lace_size[n];
1669
                uint8_t *pkt_data = data;
1670

    
1671
                if (encodings && encodings->scope & 1) {
1672
                    offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1673
                    if (offset < 0)
1674
                        continue;
1675
                }
1676

    
1677
                pkt = av_mallocz(sizeof(AVPacket));
1678
                /* XXX: prevent data copy... */
1679
                if (av_new_packet(pkt, pkt_size+offset) < 0) {
1680
                    av_free(pkt);
1681
                    res = AVERROR(ENOMEM);
1682
                    break;
1683
                }
1684
                if (offset)
1685
                    memcpy (pkt->data, encodings->compression.settings.data, offset);
1686
                memcpy (pkt->data+offset, pkt_data, pkt_size);
1687

    
1688
                if (pkt_data != data)
1689
                    av_free(pkt_data);
1690

    
1691
                if (n == 0)
1692
                    pkt->flags = is_keyframe;
1693
                pkt->stream_index = st->index;
1694

    
1695
                pkt->pts = timecode;
1696
                pkt->pos = pos;
1697
                if (st->codec->codec_id == CODEC_ID_TEXT)
1698
                    pkt->convergence_duration = duration;
1699
                else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1700
                    pkt->duration = duration;
1701

    
1702
                if (st->codec->codec_id == CODEC_ID_SSA)
1703
                    matroska_fix_ass_packet(matroska, pkt, duration);
1704

    
1705
                if (matroska->prev_pkt &&
1706
                    timecode != AV_NOPTS_VALUE &&
1707
                    matroska->prev_pkt->pts == timecode &&
1708
                    matroska->prev_pkt->stream_index == st->index)
1709
                    matroska_merge_packets(matroska->prev_pkt, pkt);
1710
                else {
1711
                    dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1712
                    matroska->prev_pkt = pkt;
1713
                }
1714
            }
1715

    
1716
            if (timecode != AV_NOPTS_VALUE)
1717
                timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1718
            data += lace_size[n];
1719
        }
1720
    }
1721

    
1722
    av_free(lace_size);
1723
    return res;
1724
}
1725

    
1726
static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1727
{
1728
    MatroskaCluster cluster = { 0 };
1729
    EbmlList *blocks_list;
1730
    MatroskaBlock *blocks;
1731
    int i, res;
1732
    int64_t pos = url_ftell(matroska->ctx->pb);
1733
    matroska->prev_pkt = NULL;
1734
    if (matroska->has_cluster_id){
1735
        /* For the first cluster we parse, its ID was already read as
1736
           part of matroska_read_header(), so don't read it again */
1737
        res = ebml_parse_id(matroska, matroska_clusters,
1738
                            MATROSKA_ID_CLUSTER, &cluster);
1739
        pos -= 4;  /* sizeof the ID which was already read */
1740
        matroska->has_cluster_id = 0;
1741
    } else
1742
        res = ebml_parse(matroska, matroska_clusters, &cluster);
1743
    blocks_list = &cluster.blocks;
1744
    blocks = blocks_list->elem;
1745
    for (i=0; i<blocks_list->nb_elem; i++)
1746
        if (blocks[i].bin.size > 0)
1747
            res=matroska_parse_block(matroska,
1748
                                     blocks[i].bin.data, blocks[i].bin.size,
1749
                                     blocks[i].bin.pos,  cluster.timecode,
1750
                                     blocks[i].duration, !blocks[i].reference,
1751
                                     pos);
1752
    ebml_free(matroska_cluster, &cluster);
1753
    if (res < 0)  matroska->done = 1;
1754
    return res;
1755
}
1756

    
1757
static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1758
{
1759
    MatroskaDemuxContext *matroska = s->priv_data;
1760

    
1761
    while (matroska_deliver_packet(matroska, pkt)) {
1762
        if (matroska->done)
1763
            return AVERROR_EOF;
1764
        matroska_parse_cluster(matroska);
1765
    }
1766

    
1767
    return 0;
1768
}
1769

    
1770
static int matroska_read_seek(AVFormatContext *s, int stream_index,
1771
                              int64_t timestamp, int flags)
1772
{
1773
    MatroskaDemuxContext *matroska = s->priv_data;
1774
    MatroskaTrack *tracks = matroska->tracks.elem;
1775
    AVStream *st = s->streams[stream_index];
1776
    int i, index, index_sub, index_min;
1777

    
1778
    if (!st->nb_index_entries)
1779
        return 0;
1780
    timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
1781

    
1782
    if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1783
        url_fseek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
1784
        while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1785
            matroska_clear_queue(matroska);
1786
            if (matroska_parse_cluster(matroska) < 0)
1787
                break;
1788
        }
1789
    }
1790

    
1791
    matroska_clear_queue(matroska);
1792
    if (index < 0)
1793
        return 0;
1794

    
1795
    index_min = index;
1796
    for (i=0; i < matroska->tracks.nb_elem; i++) {
1797
        tracks[i].end_timecode = 0;
1798
        if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
1799
            && !tracks[i].stream->discard != AVDISCARD_ALL) {
1800
            index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
1801
            if (index_sub >= 0
1802
                && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
1803
                && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
1804
                index_min = index_sub;
1805
        }
1806
    }
1807

    
1808
    url_fseek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
1809
    matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1810
    matroska->skip_to_timecode = st->index_entries[index].timestamp;
1811
    matroska->done = 0;
1812
    av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1813
    return 0;
1814
}
1815

    
1816
static int matroska_read_close(AVFormatContext *s)
1817
{
1818
    MatroskaDemuxContext *matroska = s->priv_data;
1819
    MatroskaTrack *tracks = matroska->tracks.elem;
1820
    int n;
1821

    
1822
    matroska_clear_queue(matroska);
1823

    
1824
    for (n=0; n < matroska->tracks.nb_elem; n++)
1825
        if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1826
            av_free(tracks[n].audio.buf);
1827
    ebml_free(matroska_segment, matroska);
1828

    
1829
    return 0;
1830
}
1831

    
1832
AVInputFormat matroska_demuxer = {
1833
    "matroska",
1834
    NULL_IF_CONFIG_SMALL("Matroska file format"),
1835
    sizeof(MatroskaDemuxContext),
1836
    matroska_probe,
1837
    matroska_read_header,
1838
    matroska_read_packet,
1839
    matroska_read_close,
1840
    matroska_read_seek,
1841
    .metadata_conv = ff_mkv_metadata_conv,
1842
};