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ffmpeg / libavformat / matroskadec.c @ 1b4d327b

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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
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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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#include "internal.h"
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/* For ff_codec_get_id(). */
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#include "riff.h"
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#include "isom.h"
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#include "rm.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;
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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;
75

    
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typedef struct {
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    int nb_elem;
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    void *elem;
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} EbmlList;
80

    
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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;
86

    
87
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;
94

    
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typedef struct {
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    uint64_t algo;
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    EbmlBin  settings;
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} MatroskaTrackCompression;
99

    
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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;
130

    
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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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    uint64_t flag_forced;
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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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    int ms_compat;
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} MatroskaTrack;
151

    
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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;
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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;
187

    
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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;
200

    
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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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    uint32_t current_id;
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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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    /* 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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    uint64_t non_simple;
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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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};
283

    
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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 },
293
    { 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 },
298
    { MATROSKA_ID_VIDEOASPECTRATIO,   EBML_NONE },
299
    { 0 }
300
};
301

    
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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} },
307
    { 0 }
308
};
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310
static EbmlSyntax matroska_track_encoding_compression[] = {
311
    { MATROSKA_ID_ENCODINGCOMPALGO,   EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
312
    { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
313
    { 0 }
314
};
315

    
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static EbmlSyntax matroska_track_encoding[] = {
317
    { MATROSKA_ID_ENCODINGSCOPE,      EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
318
    { MATROSKA_ID_ENCODINGTYPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
319
    { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
320
    { MATROSKA_ID_ENCODINGORDER,      EBML_NONE },
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    { 0 }
322
};
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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} },
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    { 0 }
327
};
328

    
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static EbmlSyntax matroska_track[] = {
330
    { MATROSKA_ID_TRACKNUMBER,          EBML_UINT, 0, offsetof(MatroskaTrack,num) },
331
    { MATROSKA_ID_TRACKNAME,            EBML_UTF8, 0, offsetof(MatroskaTrack,name) },
332
    { MATROSKA_ID_TRACKUID,             EBML_UINT, 0, offsetof(MatroskaTrack,uid) },
333
    { MATROSKA_ID_TRACKTYPE,            EBML_UINT, 0, offsetof(MatroskaTrack,type) },
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    { MATROSKA_ID_CODECID,              EBML_STR,  0, offsetof(MatroskaTrack,codec_id) },
335
    { MATROSKA_ID_CODECPRIVATE,         EBML_BIN,  0, offsetof(MatroskaTrack,codec_priv) },
336
    { MATROSKA_ID_TRACKLANGUAGE,        EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
337
    { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
338
    { MATROSKA_ID_TRACKTIMECODESCALE,   EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
339
    { MATROSKA_ID_TRACKFLAGDEFAULT,     EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
340
    { MATROSKA_ID_TRACKFLAGFORCED,      EBML_UINT, 0, offsetof(MatroskaTrack,flag_forced), {.u=0} },
341
    { MATROSKA_ID_TRACKVIDEO,           EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
342
    { 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} },
344
    { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
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    { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
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    { MATROSKA_ID_CODECNAME,            EBML_NONE },
347
    { MATROSKA_ID_CODECDECODEALL,       EBML_NONE },
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    { MATROSKA_ID_CODECINFOURL,         EBML_NONE },
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    { MATROSKA_ID_CODECDOWNLOADURL,     EBML_NONE },
350
    { MATROSKA_ID_TRACKMINCACHE,        EBML_NONE },
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    { MATROSKA_ID_TRACKMAXCACHE,        EBML_NONE },
352
    { MATROSKA_ID_TRACKMAXBLKADDID,     EBML_NONE },
353
    { 0 }
354
};
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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} },
358
    { 0 }
359
};
360

    
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static EbmlSyntax matroska_attachment[] = {
362
    { MATROSKA_ID_FILEUID,            EBML_UINT, 0, offsetof(MatroskaAttachement,uid) },
363
    { 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) },
366
    { MATROSKA_ID_FILEDESC,           EBML_NONE },
367
    { 0 }
368
};
369

    
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static EbmlSyntax matroska_attachments[] = {
371
    { MATROSKA_ID_ATTACHEDFILE,       EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
372
    { 0 }
373
};
374

    
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static EbmlSyntax matroska_chapter_display[] = {
376
    { MATROSKA_ID_CHAPSTRING,         EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
377
    { MATROSKA_ID_CHAPLANG,           EBML_NONE },
378
    { 0 }
379
};
380

    
381
static EbmlSyntax matroska_chapter_entry[] = {
382
    { MATROSKA_ID_CHAPTERTIMESTART,   EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
383
    { MATROSKA_ID_CHAPTERTIMEEND,     EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
384
    { MATROSKA_ID_CHAPTERUID,         EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
385
    { MATROSKA_ID_CHAPTERDISPLAY,     EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
386
    { MATROSKA_ID_CHAPTERFLAGHIDDEN,  EBML_NONE },
387
    { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
388
    { MATROSKA_ID_CHAPTERPHYSEQUIV,   EBML_NONE },
389
    { MATROSKA_ID_CHAPTERATOM,        EBML_NONE },
390
    { 0 }
391
};
392

    
393
static EbmlSyntax matroska_chapter[] = {
394
    { MATROSKA_ID_CHAPTERATOM,        EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
395
    { MATROSKA_ID_EDITIONUID,         EBML_NONE },
396
    { MATROSKA_ID_EDITIONFLAGHIDDEN,  EBML_NONE },
397
    { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
398
    { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
399
    { 0 }
400
};
401

    
402
static EbmlSyntax matroska_chapters[] = {
403
    { MATROSKA_ID_EDITIONENTRY,       EBML_NEST, 0, 0, {.n=matroska_chapter} },
404
    { 0 }
405
};
406

    
407
static EbmlSyntax matroska_index_pos[] = {
408
    { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
409
    { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos)   },
410
    { MATROSKA_ID_CUEBLOCKNUMBER,     EBML_NONE },
411
    { 0 }
412
};
413

    
414
static EbmlSyntax matroska_index_entry[] = {
415
    { MATROSKA_ID_CUETIME,            EBML_UINT, 0, offsetof(MatroskaIndex,time) },
416
    { MATROSKA_ID_CUETRACKPOSITION,   EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
417
    { 0 }
418
};
419

    
420
static EbmlSyntax matroska_index[] = {
421
    { MATROSKA_ID_POINTENTRY,         EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
422
    { 0 }
423
};
424

    
425
static EbmlSyntax matroska_simpletag[] = {
426
    { MATROSKA_ID_TAGNAME,            EBML_UTF8, 0, offsetof(MatroskaTag,name) },
427
    { MATROSKA_ID_TAGSTRING,          EBML_UTF8, 0, offsetof(MatroskaTag,string) },
428
    { MATROSKA_ID_TAGLANG,            EBML_STR,  0, offsetof(MatroskaTag,lang), {.s="und"} },
429
    { MATROSKA_ID_TAGDEFAULT,         EBML_UINT, 0, offsetof(MatroskaTag,def) },
430
    { MATROSKA_ID_TAGDEFAULT_BUG,     EBML_UINT, 0, offsetof(MatroskaTag,def) },
431
    { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
432
    { 0 }
433
};
434

    
435
static EbmlSyntax matroska_tagtargets[] = {
436
    { MATROSKA_ID_TAGTARGETS_TYPE,      EBML_STR,  0, offsetof(MatroskaTagTarget,type) },
437
    { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget,typevalue), {.u=50} },
438
    { MATROSKA_ID_TAGTARGETS_TRACKUID,  EBML_UINT, 0, offsetof(MatroskaTagTarget,trackuid) },
439
    { MATROSKA_ID_TAGTARGETS_CHAPTERUID,EBML_UINT, 0, offsetof(MatroskaTagTarget,chapteruid) },
440
    { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,attachuid) },
441
    { 0 }
442
};
443

    
444
static EbmlSyntax matroska_tag[] = {
445
    { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags,tag), {.n=matroska_simpletag} },
446
    { MATROSKA_ID_TAGTARGETS,         EBML_NEST, 0, offsetof(MatroskaTags,target), {.n=matroska_tagtargets} },
447
    { 0 }
448
};
449

    
450
static EbmlSyntax matroska_tags[] = {
451
    { MATROSKA_ID_TAG,                EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
452
    { 0 }
453
};
454

    
455
static EbmlSyntax matroska_seekhead_entry[] = {
456
    { MATROSKA_ID_SEEKID,             EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
457
    { MATROSKA_ID_SEEKPOSITION,       EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
458
    { 0 }
459
};
460

    
461
static EbmlSyntax matroska_seekhead[] = {
462
    { MATROSKA_ID_SEEKENTRY,          EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
463
    { 0 }
464
};
465

    
466
static EbmlSyntax matroska_segment[] = {
467
    { MATROSKA_ID_INFO,           EBML_NEST, 0, 0, {.n=matroska_info       } },
468
    { MATROSKA_ID_TRACKS,         EBML_NEST, 0, 0, {.n=matroska_tracks     } },
469
    { MATROSKA_ID_ATTACHMENTS,    EBML_NEST, 0, 0, {.n=matroska_attachments} },
470
    { MATROSKA_ID_CHAPTERS,       EBML_NEST, 0, 0, {.n=matroska_chapters   } },
471
    { MATROSKA_ID_CUES,           EBML_NEST, 0, 0, {.n=matroska_index      } },
472
    { MATROSKA_ID_TAGS,           EBML_NEST, 0, 0, {.n=matroska_tags       } },
473
    { MATROSKA_ID_SEEKHEAD,       EBML_NEST, 0, 0, {.n=matroska_seekhead   } },
474
    { MATROSKA_ID_CLUSTER,        EBML_STOP },
475
    { 0 }
476
};
477

    
478
static EbmlSyntax matroska_segments[] = {
479
    { MATROSKA_ID_SEGMENT,        EBML_NEST, 0, 0, {.n=matroska_segment    } },
480
    { 0 }
481
};
482

    
483
static EbmlSyntax matroska_blockgroup[] = {
484
    { MATROSKA_ID_BLOCK,          EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
485
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
486
    { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
487
    { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
488
    { 1,                          EBML_UINT, 0, offsetof(MatroskaBlock,non_simple), {.u=1} },
489
    { 0 }
490
};
491

    
492
static EbmlSyntax matroska_cluster[] = {
493
    { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
494
    { MATROSKA_ID_BLOCKGROUP,     EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
495
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
496
    { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
497
    { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
498
    { 0 }
499
};
500

    
501
static EbmlSyntax matroska_clusters[] = {
502
    { MATROSKA_ID_CLUSTER,        EBML_NEST, 0, 0, {.n=matroska_cluster} },
503
    { MATROSKA_ID_INFO,           EBML_NONE },
504
    { MATROSKA_ID_CUES,           EBML_NONE },
505
    { MATROSKA_ID_TAGS,           EBML_NONE },
506
    { MATROSKA_ID_SEEKHEAD,       EBML_NONE },
507
    { 0 }
508
};
509

    
510
static const char *matroska_doctypes[] = { "matroska", "webm" };
511

    
512
/*
513
 * Return: Whether we reached the end of a level in the hierarchy or not.
514
 */
515
static int ebml_level_end(MatroskaDemuxContext *matroska)
516
{
517
    ByteIOContext *pb = matroska->ctx->pb;
518
    int64_t pos = url_ftell(pb);
519

    
520
    if (matroska->num_levels > 0) {
521
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
522
        if (pos - level->start >= level->length || matroska->current_id) {
523
            matroska->num_levels--;
524
            return 1;
525
        }
526
    }
527
    return 0;
528
}
529

    
530
/*
531
 * Read: an "EBML number", which is defined as a variable-length
532
 * array of bytes. The first byte indicates the length by giving a
533
 * number of 0-bits followed by a one. The position of the first
534
 * "one" bit inside the first byte indicates the length of this
535
 * number.
536
 * Returns: number of bytes read, < 0 on error
537
 */
538
static int ebml_read_num(MatroskaDemuxContext *matroska, ByteIOContext *pb,
539
                         int max_size, uint64_t *number)
540
{
541
    int read = 1, n = 1;
542
    uint64_t total = 0;
543

    
544
    /* The first byte tells us the length in bytes - get_byte() can normally
545
     * return 0, but since that's not a valid first ebmlID byte, we can
546
     * use it safely here to catch EOS. */
547
    if (!(total = get_byte(pb))) {
548
        /* we might encounter EOS here */
549
        if (!url_feof(pb)) {
550
            int64_t pos = url_ftell(pb);
551
            av_log(matroska->ctx, AV_LOG_ERROR,
552
                   "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
553
                   pos, pos);
554
        }
555
        return AVERROR(EIO); /* EOS or actual I/O error */
556
    }
557

    
558
    /* get the length of the EBML number */
559
    read = 8 - ff_log2_tab[total];
560
    if (read > max_size) {
561
        int64_t pos = url_ftell(pb) - 1;
562
        av_log(matroska->ctx, AV_LOG_ERROR,
563
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
564
               (uint8_t) total, pos, pos);
565
        return AVERROR_INVALIDDATA;
566
    }
567

    
568
    /* read out length */
569
    total ^= 1 << ff_log2_tab[total];
570
    while (n++ < read)
571
        total = (total << 8) | get_byte(pb);
572

    
573
    *number = total;
574

    
575
    return read;
576
}
577

    
578
/**
579
 * Read a EBML length value.
580
 * This needs special handling for the "unknown length" case which has multiple
581
 * encodings.
582
 */
583
static int ebml_read_length(MatroskaDemuxContext *matroska, ByteIOContext *pb,
584
                            uint64_t *number)
585
{
586
    int res = ebml_read_num(matroska, pb, 8, number);
587
    if (res > 0 && *number + 1 == 1ULL << (7 * res))
588
        *number = 0xffffffffffffffULL;
589
    return res;
590
}
591

    
592
/*
593
 * Read the next element as an unsigned int.
594
 * 0 is success, < 0 is failure.
595
 */
596
static int ebml_read_uint(ByteIOContext *pb, int size, uint64_t *num)
597
{
598
    int n = 0;
599

    
600
    if (size > 8)
601
        return AVERROR_INVALIDDATA;
602

    
603
    /* big-endian ordering; build up number */
604
    *num = 0;
605
    while (n++ < size)
606
        *num = (*num << 8) | get_byte(pb);
607

    
608
    return 0;
609
}
610

    
611
/*
612
 * Read the next element as a float.
613
 * 0 is success, < 0 is failure.
614
 */
615
static int ebml_read_float(ByteIOContext *pb, int size, double *num)
616
{
617
    if (size == 0) {
618
        *num = 0;
619
    } else if (size == 4) {
620
        *num= av_int2flt(get_be32(pb));
621
    } else if(size==8){
622
        *num= av_int2dbl(get_be64(pb));
623
    } else
624
        return AVERROR_INVALIDDATA;
625

    
626
    return 0;
627
}
628

    
629
/*
630
 * Read the next element as an ASCII string.
631
 * 0 is success, < 0 is failure.
632
 */
633
static int ebml_read_ascii(ByteIOContext *pb, int size, char **str)
634
{
635
    av_free(*str);
636
    /* EBML strings are usually not 0-terminated, so we allocate one
637
     * byte more, read the string and NULL-terminate it ourselves. */
638
    if (!(*str = av_malloc(size + 1)))
639
        return AVERROR(ENOMEM);
640
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
641
        av_freep(str);
642
        return AVERROR(EIO);
643
    }
644
    (*str)[size] = '\0';
645

    
646
    return 0;
647
}
648

    
649
/*
650
 * Read the next element as binary data.
651
 * 0 is success, < 0 is failure.
652
 */
653
static int ebml_read_binary(ByteIOContext *pb, int length, EbmlBin *bin)
654
{
655
    av_free(bin->data);
656
    if (!(bin->data = av_malloc(length)))
657
        return AVERROR(ENOMEM);
658

    
659
    bin->size = length;
660
    bin->pos  = url_ftell(pb);
661
    if (get_buffer(pb, bin->data, length) != length) {
662
        av_freep(&bin->data);
663
        return AVERROR(EIO);
664
    }
665

    
666
    return 0;
667
}
668

    
669
/*
670
 * Read the next element, but only the header. The contents
671
 * are supposed to be sub-elements which can be read separately.
672
 * 0 is success, < 0 is failure.
673
 */
674
static int ebml_read_master(MatroskaDemuxContext *matroska, uint64_t length)
675
{
676
    ByteIOContext *pb = matroska->ctx->pb;
677
    MatroskaLevel *level;
678

    
679
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
680
        av_log(matroska->ctx, AV_LOG_ERROR,
681
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
682
        return AVERROR(ENOSYS);
683
    }
684

    
685
    level = &matroska->levels[matroska->num_levels++];
686
    level->start = url_ftell(pb);
687
    level->length = length;
688

    
689
    return 0;
690
}
691

    
692
/*
693
 * Read signed/unsigned "EBML" numbers.
694
 * Return: number of bytes processed, < 0 on error
695
 */
696
static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
697
                                 uint8_t *data, uint32_t size, uint64_t *num)
698
{
699
    ByteIOContext pb;
700
    init_put_byte(&pb, data, size, 0, NULL, NULL, NULL, NULL);
701
    return ebml_read_num(matroska, &pb, FFMIN(size, 8), num);
702
}
703

    
704
/*
705
 * Same as above, but signed.
706
 */
707
static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
708
                                 uint8_t *data, uint32_t size, int64_t *num)
709
{
710
    uint64_t unum;
711
    int res;
712

    
713
    /* read as unsigned number first */
714
    if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
715
        return res;
716

    
717
    /* make signed (weird way) */
718
    *num = unum - ((1LL << (7*res - 1)) - 1);
719

    
720
    return res;
721
}
722

    
723
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
724
                           EbmlSyntax *syntax, void *data);
725

    
726
static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
727
                         uint32_t id, void *data)
728
{
729
    int i;
730
    for (i=0; syntax[i].id; i++)
731
        if (id == syntax[i].id)
732
            break;
733
    if (!syntax[i].id && id == MATROSKA_ID_CLUSTER &&
734
        matroska->num_levels > 0 &&
735
        matroska->levels[matroska->num_levels-1].length == 0xffffffffffffff)
736
        return 0;  // we reached the end of an unknown size cluster
737
    if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
738
        av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
739
    return ebml_parse_elem(matroska, &syntax[i], data);
740
}
741

    
742
static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
743
                      void *data)
744
{
745
    if (!matroska->current_id) {
746
        uint64_t id;
747
        int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
748
        if (res < 0)
749
            return res;
750
        matroska->current_id = id | 1 << 7*res;
751
    }
752
    return ebml_parse_id(matroska, syntax, matroska->current_id, data);
753
}
754

    
755
static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
756
                           void *data)
757
{
758
    int i, res = 0;
759

    
760
    for (i=0; syntax[i].id; i++)
761
        switch (syntax[i].type) {
762
        case EBML_UINT:
763
            *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
764
            break;
765
        case EBML_FLOAT:
766
            *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
767
            break;
768
        case EBML_STR:
769
        case EBML_UTF8:
770
            *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
771
            break;
772
        }
773

    
774
    while (!res && !ebml_level_end(matroska))
775
        res = ebml_parse(matroska, syntax, data);
776

    
777
    return res;
778
}
779

    
780
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
781
                           EbmlSyntax *syntax, void *data)
782
{
783
    ByteIOContext *pb = matroska->ctx->pb;
784
    uint32_t id = syntax->id;
785
    uint64_t length;
786
    int res;
787

    
788
    data = (char *)data + syntax->data_offset;
789
    if (syntax->list_elem_size) {
790
        EbmlList *list = data;
791
        list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
792
        data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
793
        memset(data, 0, syntax->list_elem_size);
794
        list->nb_elem++;
795
    }
796

    
797
    if (syntax->type != EBML_PASS && syntax->type != EBML_STOP) {
798
        matroska->current_id = 0;
799
        if ((res = ebml_read_length(matroska, pb, &length)) < 0)
800
            return res;
801
    }
802

    
803
    switch (syntax->type) {
804
    case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
805
    case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
806
    case EBML_STR:
807
    case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
808
    case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
809
    case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
810
                         return res;
811
                     if (id == MATROSKA_ID_SEGMENT)
812
                         matroska->segment_start = url_ftell(matroska->ctx->pb);
813
                     return ebml_parse_nest(matroska, syntax->def.n, data);
814
    case EBML_PASS:  return ebml_parse_id(matroska, syntax->def.n, id, data);
815
    case EBML_STOP:  return 1;
816
    default:         return url_fseek(pb,length,SEEK_CUR)<0 ? AVERROR(EIO) : 0;
817
    }
818
    if (res == AVERROR_INVALIDDATA)
819
        av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
820
    else if (res == AVERROR(EIO))
821
        av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
822
    return res;
823
}
824

    
825
static void ebml_free(EbmlSyntax *syntax, void *data)
826
{
827
    int i, j;
828
    for (i=0; syntax[i].id; i++) {
829
        void *data_off = (char *)data + syntax[i].data_offset;
830
        switch (syntax[i].type) {
831
        case EBML_STR:
832
        case EBML_UTF8:  av_freep(data_off);                      break;
833
        case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
834
        case EBML_NEST:
835
            if (syntax[i].list_elem_size) {
836
                EbmlList *list = data_off;
837
                char *ptr = list->elem;
838
                for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
839
                    ebml_free(syntax[i].def.n, ptr);
840
                av_free(list->elem);
841
            } else
842
                ebml_free(syntax[i].def.n, data_off);
843
        default:  break;
844
        }
845
    }
846
}
847

    
848

    
849
/*
850
 * Autodetecting...
851
 */
852
static int matroska_probe(AVProbeData *p)
853
{
854
    uint64_t total = 0;
855
    int len_mask = 0x80, size = 1, n = 1, i;
856

    
857
    /* EBML header? */
858
    if (AV_RB32(p->buf) != EBML_ID_HEADER)
859
        return 0;
860

    
861
    /* length of header */
862
    total = p->buf[4];
863
    while (size <= 8 && !(total & len_mask)) {
864
        size++;
865
        len_mask >>= 1;
866
    }
867
    if (size > 8)
868
      return 0;
869
    total &= (len_mask - 1);
870
    while (n < size)
871
        total = (total << 8) | p->buf[4 + n++];
872

    
873
    /* Does the probe data contain the whole header? */
874
    if (p->buf_size < 4 + size + total)
875
      return 0;
876

    
877
    /* The header should contain a known document type. For now,
878
     * we don't parse the whole header but simply check for the
879
     * availability of that array of characters inside the header.
880
     * Not fully fool-proof, but good enough. */
881
    for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
882
        int probelen = strlen(matroska_doctypes[i]);
883
        for (n = 4+size; n <= 4+size+total-probelen; n++)
884
            if (!memcmp(p->buf+n, matroska_doctypes[i], probelen))
885
                return AVPROBE_SCORE_MAX;
886
    }
887

    
888
    // probably valid EBML header but no recognized doctype
889
    return AVPROBE_SCORE_MAX/2;
890
}
891

    
892
static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
893
                                                 int num)
894
{
895
    MatroskaTrack *tracks = matroska->tracks.elem;
896
    int i;
897

    
898
    for (i=0; i < matroska->tracks.nb_elem; i++)
899
        if (tracks[i].num == num)
900
            return &tracks[i];
901

    
902
    av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
903
    return NULL;
904
}
905

    
906
static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
907
                                  MatroskaTrack *track)
908
{
909
    MatroskaTrackEncoding *encodings = track->encodings.elem;
910
    uint8_t* data = *buf;
911
    int isize = *buf_size;
912
    uint8_t* pkt_data = NULL;
913
    int pkt_size = isize;
914
    int result = 0;
915
    int olen;
916

    
917
    if (pkt_size >= 10000000)
918
        return -1;
919

    
920
    switch (encodings[0].compression.algo) {
921
    case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
922
        return encodings[0].compression.settings.size;
923
    case MATROSKA_TRACK_ENCODING_COMP_LZO:
924
        do {
925
            olen = pkt_size *= 3;
926
            pkt_data = av_realloc(pkt_data, pkt_size+AV_LZO_OUTPUT_PADDING);
927
            result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
928
        } while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
929
        if (result)
930
            goto failed;
931
        pkt_size -= olen;
932
        break;
933
#if CONFIG_ZLIB
934
    case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
935
        z_stream zstream = {0};
936
        if (inflateInit(&zstream) != Z_OK)
937
            return -1;
938
        zstream.next_in = data;
939
        zstream.avail_in = isize;
940
        do {
941
            pkt_size *= 3;
942
            pkt_data = av_realloc(pkt_data, pkt_size);
943
            zstream.avail_out = pkt_size - zstream.total_out;
944
            zstream.next_out = pkt_data + zstream.total_out;
945
            result = inflate(&zstream, Z_NO_FLUSH);
946
        } while (result==Z_OK && pkt_size<10000000);
947
        pkt_size = zstream.total_out;
948
        inflateEnd(&zstream);
949
        if (result != Z_STREAM_END)
950
            goto failed;
951
        break;
952
    }
953
#endif
954
#if CONFIG_BZLIB
955
    case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
956
        bz_stream bzstream = {0};
957
        if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
958
            return -1;
959
        bzstream.next_in = data;
960
        bzstream.avail_in = isize;
961
        do {
962
            pkt_size *= 3;
963
            pkt_data = av_realloc(pkt_data, pkt_size);
964
            bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
965
            bzstream.next_out = pkt_data + bzstream.total_out_lo32;
966
            result = BZ2_bzDecompress(&bzstream);
967
        } while (result==BZ_OK && pkt_size<10000000);
968
        pkt_size = bzstream.total_out_lo32;
969
        BZ2_bzDecompressEnd(&bzstream);
970
        if (result != BZ_STREAM_END)
971
            goto failed;
972
        break;
973
    }
974
#endif
975
    default:
976
        return -1;
977
    }
978

    
979
    *buf = pkt_data;
980
    *buf_size = pkt_size;
981
    return 0;
982
 failed:
983
    av_free(pkt_data);
984
    return -1;
985
}
986

    
987
static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
988
                                    AVPacket *pkt, uint64_t display_duration)
989
{
990
    char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
991
    for (; *ptr!=',' && ptr<end-1; ptr++);
992
    if (*ptr == ',')
993
        layer = ++ptr;
994
    for (; *ptr!=',' && ptr<end-1; ptr++);
995
    if (*ptr == ',') {
996
        int64_t end_pts = pkt->pts + display_duration;
997
        int sc = matroska->time_scale * pkt->pts / 10000000;
998
        int ec = matroska->time_scale * end_pts  / 10000000;
999
        int sh, sm, ss, eh, em, es, len;
1000
        sh = sc/360000;  sc -= 360000*sh;
1001
        sm = sc/  6000;  sc -=   6000*sm;
1002
        ss = sc/   100;  sc -=    100*ss;
1003
        eh = ec/360000;  ec -= 360000*eh;
1004
        em = ec/  6000;  ec -=   6000*em;
1005
        es = ec/   100;  ec -=    100*es;
1006
        *ptr++ = '\0';
1007
        len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
1008
        if (!(line = av_malloc(len)))
1009
            return;
1010
        snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
1011
                 layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
1012
        av_free(pkt->data);
1013
        pkt->data = line;
1014
        pkt->size = strlen(line);
1015
    }
1016
}
1017

    
1018
static void matroska_merge_packets(AVPacket *out, AVPacket *in)
1019
{
1020
    out->data = av_realloc(out->data, out->size+in->size);
1021
    memcpy(out->data+out->size, in->data, in->size);
1022
    out->size += in->size;
1023
    av_destruct_packet(in);
1024
    av_free(in);
1025
}
1026

    
1027
static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1028
                                 AVMetadata **metadata, char *prefix)
1029
{
1030
    MatroskaTag *tags = list->elem;
1031
    char key[1024];
1032
    int i;
1033

    
1034
    for (i=0; i < list->nb_elem; i++) {
1035
        const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1036
        if (prefix)  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1037
        else         av_strlcpy(key, tags[i].name, sizeof(key));
1038
        if (tags[i].def || !lang) {
1039
        av_metadata_set2(metadata, key, tags[i].string, 0);
1040
        if (tags[i].sub.nb_elem)
1041
            matroska_convert_tag(s, &tags[i].sub, metadata, key);
1042
        }
1043
        if (lang) {
1044
            av_strlcat(key, "-", sizeof(key));
1045
            av_strlcat(key, lang, sizeof(key));
1046
            av_metadata_set2(metadata, key, tags[i].string, 0);
1047
            if (tags[i].sub.nb_elem)
1048
                matroska_convert_tag(s, &tags[i].sub, metadata, key);
1049
        }
1050
    }
1051
}
1052

    
1053
static void matroska_convert_tags(AVFormatContext *s)
1054
{
1055
    MatroskaDemuxContext *matroska = s->priv_data;
1056
    MatroskaTags *tags = matroska->tags.elem;
1057
    int i, j;
1058

    
1059
    for (i=0; i < matroska->tags.nb_elem; i++) {
1060
        if (tags[i].target.attachuid) {
1061
            MatroskaAttachement *attachment = matroska->attachments.elem;
1062
            for (j=0; j<matroska->attachments.nb_elem; j++)
1063
                if (attachment[j].uid == tags[i].target.attachuid)
1064
                    matroska_convert_tag(s, &tags[i].tag,
1065
                                         &attachment[j].stream->metadata, NULL);
1066
        } else if (tags[i].target.chapteruid) {
1067
            MatroskaChapter *chapter = matroska->chapters.elem;
1068
            for (j=0; j<matroska->chapters.nb_elem; j++)
1069
                if (chapter[j].uid == tags[i].target.chapteruid)
1070
                    matroska_convert_tag(s, &tags[i].tag,
1071
                                         &chapter[j].chapter->metadata, NULL);
1072
        } else if (tags[i].target.trackuid) {
1073
            MatroskaTrack *track = matroska->tracks.elem;
1074
            for (j=0; j<matroska->tracks.nb_elem; j++)
1075
                if (track[j].uid == tags[i].target.trackuid)
1076
                    matroska_convert_tag(s, &tags[i].tag,
1077
                                         &track[j].stream->metadata, NULL);
1078
        } else {
1079
            matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1080
                                 tags[i].target.type);
1081
        }
1082
    }
1083
}
1084

    
1085
static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1086
{
1087
    EbmlList *seekhead_list = &matroska->seekhead;
1088
    MatroskaSeekhead *seekhead = seekhead_list->elem;
1089
    uint32_t level_up = matroska->level_up;
1090
    int64_t before_pos = url_ftell(matroska->ctx->pb);
1091
    uint32_t saved_id = matroska->current_id;
1092
    MatroskaLevel level;
1093
    int i;
1094

    
1095
    // we should not do any seeking in the streaming case
1096
    if (url_is_streamed(matroska->ctx->pb) ||
1097
        (matroska->ctx->flags & AVFMT_FLAG_IGNIDX))
1098
        return;
1099

    
1100
    for (i=0; i<seekhead_list->nb_elem; i++) {
1101
        int64_t offset = seekhead[i].pos + matroska->segment_start;
1102

    
1103
        if (seekhead[i].pos <= before_pos
1104
            || seekhead[i].id == MATROSKA_ID_SEEKHEAD
1105
            || seekhead[i].id == MATROSKA_ID_CLUSTER)
1106
            continue;
1107

    
1108
        /* seek */
1109
        if (url_fseek(matroska->ctx->pb, offset, SEEK_SET) != offset)
1110
            continue;
1111

    
1112
        /* We don't want to lose our seekhead level, so we add
1113
         * a dummy. This is a crude hack. */
1114
        if (matroska->num_levels == EBML_MAX_DEPTH) {
1115
            av_log(matroska->ctx, AV_LOG_INFO,
1116
                   "Max EBML element depth (%d) reached, "
1117
                   "cannot parse further.\n", EBML_MAX_DEPTH);
1118
            break;
1119
        }
1120

    
1121
        level.start = 0;
1122
        level.length = (uint64_t)-1;
1123
        matroska->levels[matroska->num_levels] = level;
1124
        matroska->num_levels++;
1125
        matroska->current_id = 0;
1126

    
1127
        ebml_parse(matroska, matroska_segment, matroska);
1128

    
1129
        /* remove dummy level */
1130
        while (matroska->num_levels) {
1131
            uint64_t length = matroska->levels[--matroska->num_levels].length;
1132
            if (length == (uint64_t)-1)
1133
                break;
1134
        }
1135
    }
1136

    
1137
    /* seek back */
1138
    url_fseek(matroska->ctx->pb, before_pos, SEEK_SET);
1139
    matroska->level_up = level_up;
1140
    matroska->current_id = saved_id;
1141
}
1142

    
1143
static int matroska_aac_profile(char *codec_id)
1144
{
1145
    static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1146
    int profile;
1147

    
1148
    for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1149
        if (strstr(codec_id, aac_profiles[profile]))
1150
            break;
1151
    return profile + 1;
1152
}
1153

    
1154
static int matroska_aac_sri(int samplerate)
1155
{
1156
    int sri;
1157

    
1158
    for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
1159
        if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1160
            break;
1161
    return sri;
1162
}
1163

    
1164
static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1165
{
1166
    MatroskaDemuxContext *matroska = s->priv_data;
1167
    EbmlList *attachements_list = &matroska->attachments;
1168
    MatroskaAttachement *attachements;
1169
    EbmlList *chapters_list = &matroska->chapters;
1170
    MatroskaChapter *chapters;
1171
    MatroskaTrack *tracks;
1172
    EbmlList *index_list;
1173
    MatroskaIndex *index;
1174
    int index_scale = 1;
1175
    uint64_t max_start = 0;
1176
    Ebml ebml = { 0 };
1177
    AVStream *st;
1178
    int i, j, res;
1179

    
1180
    matroska->ctx = s;
1181

    
1182
    /* First read the EBML header. */
1183
    if (ebml_parse(matroska, ebml_syntax, &ebml)
1184
        || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1185
        || ebml.id_length > sizeof(uint32_t) || ebml.doctype_version > 2) {
1186
        av_log(matroska->ctx, AV_LOG_ERROR,
1187
               "EBML header using unsupported features\n"
1188
               "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1189
               ebml.version, ebml.doctype, ebml.doctype_version);
1190
        ebml_free(ebml_syntax, &ebml);
1191
        return AVERROR_PATCHWELCOME;
1192
    }
1193
    for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
1194
        if (!strcmp(ebml.doctype, matroska_doctypes[i]))
1195
            break;
1196
    if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
1197
        av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
1198
    }
1199
    ebml_free(ebml_syntax, &ebml);
1200

    
1201
    /* The next thing is a segment. */
1202
    if ((res = ebml_parse(matroska, matroska_segments, matroska)) < 0)
1203
        return res;
1204
    matroska_execute_seekhead(matroska);
1205

    
1206
    if (!matroska->time_scale)
1207
        matroska->time_scale = 1000000;
1208
    if (matroska->duration)
1209
        matroska->ctx->duration = matroska->duration * matroska->time_scale
1210
                                  * 1000 / AV_TIME_BASE;
1211
    av_metadata_set2(&s->metadata, "title", matroska->title, 0);
1212

    
1213
    tracks = matroska->tracks.elem;
1214
    for (i=0; i < matroska->tracks.nb_elem; i++) {
1215
        MatroskaTrack *track = &tracks[i];
1216
        enum CodecID codec_id = CODEC_ID_NONE;
1217
        EbmlList *encodings_list = &tracks->encodings;
1218
        MatroskaTrackEncoding *encodings = encodings_list->elem;
1219
        uint8_t *extradata = NULL;
1220
        int extradata_size = 0;
1221
        int extradata_offset = 0;
1222
        ByteIOContext b;
1223

    
1224
        /* Apply some sanity checks. */
1225
        if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1226
            track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1227
            track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1228
            av_log(matroska->ctx, AV_LOG_INFO,
1229
                   "Unknown or unsupported track type %"PRIu64"\n",
1230
                   track->type);
1231
            continue;
1232
        }
1233
        if (track->codec_id == NULL)
1234
            continue;
1235

    
1236
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1237
            if (!track->default_duration)
1238
                track->default_duration = 1000000000/track->video.frame_rate;
1239
            if (!track->video.display_width)
1240
                track->video.display_width = track->video.pixel_width;
1241
            if (!track->video.display_height)
1242
                track->video.display_height = track->video.pixel_height;
1243
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1244
            if (!track->audio.out_samplerate)
1245
                track->audio.out_samplerate = track->audio.samplerate;
1246
        }
1247
        if (encodings_list->nb_elem > 1) {
1248
            av_log(matroska->ctx, AV_LOG_ERROR,
1249
                   "Multiple combined encodings no supported");
1250
        } else if (encodings_list->nb_elem == 1) {
1251
            if (encodings[0].type ||
1252
                (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1253
#if CONFIG_ZLIB
1254
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1255
#endif
1256
#if CONFIG_BZLIB
1257
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1258
#endif
1259
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1260
                encodings[0].scope = 0;
1261
                av_log(matroska->ctx, AV_LOG_ERROR,
1262
                       "Unsupported encoding type");
1263
            } else if (track->codec_priv.size && encodings[0].scope&2) {
1264
                uint8_t *codec_priv = track->codec_priv.data;
1265
                int offset = matroska_decode_buffer(&track->codec_priv.data,
1266
                                                    &track->codec_priv.size,
1267
                                                    track);
1268
                if (offset < 0) {
1269
                    track->codec_priv.data = NULL;
1270
                    track->codec_priv.size = 0;
1271
                    av_log(matroska->ctx, AV_LOG_ERROR,
1272
                           "Failed to decode codec private data\n");
1273
                } else if (offset > 0) {
1274
                    track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1275
                    memcpy(track->codec_priv.data,
1276
                           encodings[0].compression.settings.data, offset);
1277
                    memcpy(track->codec_priv.data+offset, codec_priv,
1278
                           track->codec_priv.size);
1279
                    track->codec_priv.size += offset;
1280
                }
1281
                if (codec_priv != track->codec_priv.data)
1282
                    av_free(codec_priv);
1283
            }
1284
        }
1285

    
1286
        for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1287
            if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1288
                        strlen(ff_mkv_codec_tags[j].str))){
1289
                codec_id= ff_mkv_codec_tags[j].id;
1290
                break;
1291
            }
1292
        }
1293

    
1294
        st = track->stream = av_new_stream(s, 0);
1295
        if (st == NULL)
1296
            return AVERROR(ENOMEM);
1297

    
1298
        if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1299
            && track->codec_priv.size >= 40
1300
            && track->codec_priv.data != NULL) {
1301
            track->ms_compat = 1;
1302
            track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1303
            codec_id = ff_codec_get_id(ff_codec_bmp_tags, track->video.fourcc);
1304
            extradata_offset = 40;
1305
        } else if (!strcmp(track->codec_id, "A_MS/ACM")
1306
                   && track->codec_priv.size >= 14
1307
                   && track->codec_priv.data != NULL) {
1308
            init_put_byte(&b, track->codec_priv.data, track->codec_priv.size,
1309
                          URL_RDONLY, NULL, NULL, NULL, NULL);
1310
            ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1311
            codec_id = st->codec->codec_id;
1312
            extradata_offset = FFMIN(track->codec_priv.size, 18);
1313
        } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1314
                   && (track->codec_priv.size >= 86)
1315
                   && (track->codec_priv.data != NULL)) {
1316
            track->video.fourcc = AV_RL32(track->codec_priv.data);
1317
            codec_id=ff_codec_get_id(codec_movvideo_tags, track->video.fourcc);
1318
        } else if (codec_id == CODEC_ID_PCM_S16BE) {
1319
            switch (track->audio.bitdepth) {
1320
            case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1321
            case 24:  codec_id = CODEC_ID_PCM_S24BE;  break;
1322
            case 32:  codec_id = CODEC_ID_PCM_S32BE;  break;
1323
            }
1324
        } else if (codec_id == CODEC_ID_PCM_S16LE) {
1325
            switch (track->audio.bitdepth) {
1326
            case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1327
            case 24:  codec_id = CODEC_ID_PCM_S24LE;  break;
1328
            case 32:  codec_id = CODEC_ID_PCM_S32LE;  break;
1329
            }
1330
        } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1331
            codec_id = CODEC_ID_PCM_F64LE;
1332
        } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1333
            int profile = matroska_aac_profile(track->codec_id);
1334
            int sri = matroska_aac_sri(track->audio.samplerate);
1335
            extradata = av_malloc(5);
1336
            if (extradata == NULL)
1337
                return AVERROR(ENOMEM);
1338
            extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1339
            extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1340
            if (strstr(track->codec_id, "SBR")) {
1341
                sri = matroska_aac_sri(track->audio.out_samplerate);
1342
                extradata[2] = 0x56;
1343
                extradata[3] = 0xE5;
1344
                extradata[4] = 0x80 | (sri<<3);
1345
                extradata_size = 5;
1346
            } else
1347
                extradata_size = 2;
1348
        } else if (codec_id == CODEC_ID_TTA) {
1349
            extradata_size = 30;
1350
            extradata = av_mallocz(extradata_size);
1351
            if (extradata == NULL)
1352
                return AVERROR(ENOMEM);
1353
            init_put_byte(&b, extradata, extradata_size, 1,
1354
                          NULL, NULL, NULL, NULL);
1355
            put_buffer(&b, "TTA1", 4);
1356
            put_le16(&b, 1);
1357
            put_le16(&b, track->audio.channels);
1358
            put_le16(&b, track->audio.bitdepth);
1359
            put_le32(&b, track->audio.out_samplerate);
1360
            put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1361
        } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1362
                   codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1363
            extradata_offset = 26;
1364
        } else if (codec_id == CODEC_ID_RA_144) {
1365
            track->audio.out_samplerate = 8000;
1366
            track->audio.channels = 1;
1367
        } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1368
                   codec_id == CODEC_ID_ATRAC3 || codec_id == CODEC_ID_SIPR) {
1369
            int flavor;
1370
            init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1371
                          0, NULL, NULL, NULL, NULL);
1372
            url_fskip(&b, 22);
1373
            flavor                       = get_be16(&b);
1374
            track->audio.coded_framesize = get_be32(&b);
1375
            url_fskip(&b, 12);
1376
            track->audio.sub_packet_h    = get_be16(&b);
1377
            track->audio.frame_size      = get_be16(&b);
1378
            track->audio.sub_packet_size = get_be16(&b);
1379
            track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1380
            if (codec_id == CODEC_ID_RA_288) {
1381
                st->codec->block_align = track->audio.coded_framesize;
1382
                track->codec_priv.size = 0;
1383
            } else {
1384
                if (codec_id == CODEC_ID_SIPR && flavor < 4) {
1385
                    const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
1386
                    track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
1387
                    st->codec->bit_rate = sipr_bit_rate[flavor];
1388
                }
1389
                st->codec->block_align = track->audio.sub_packet_size;
1390
                extradata_offset = 78;
1391
            }
1392
        }
1393
        track->codec_priv.size -= extradata_offset;
1394

    
1395
        if (codec_id == CODEC_ID_NONE)
1396
            av_log(matroska->ctx, AV_LOG_INFO,
1397
                   "Unknown/unsupported CodecID %s.\n", track->codec_id);
1398

    
1399
        if (track->time_scale < 0.01)
1400
            track->time_scale = 1.0;
1401
        av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1402

    
1403
        st->codec->codec_id = codec_id;
1404
        st->start_time = 0;
1405
        if (strcmp(track->language, "und"))
1406
            av_metadata_set2(&st->metadata, "language", track->language, 0);
1407
        av_metadata_set2(&st->metadata, "title", track->name, 0);
1408

    
1409
        if (track->flag_default)
1410
            st->disposition |= AV_DISPOSITION_DEFAULT;
1411
        if (track->flag_forced)
1412
            st->disposition |= AV_DISPOSITION_FORCED;
1413

    
1414
        if (track->default_duration)
1415
            av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1416
                      track->default_duration, 1000000000, 30000);
1417

    
1418
        if (!st->codec->extradata) {
1419
            if(extradata){
1420
                st->codec->extradata = extradata;
1421
                st->codec->extradata_size = extradata_size;
1422
            } else if(track->codec_priv.data && track->codec_priv.size > 0){
1423
                st->codec->extradata = av_mallocz(track->codec_priv.size +
1424
                                                  FF_INPUT_BUFFER_PADDING_SIZE);
1425
                if(st->codec->extradata == NULL)
1426
                    return AVERROR(ENOMEM);
1427
                st->codec->extradata_size = track->codec_priv.size;
1428
                memcpy(st->codec->extradata,
1429
                       track->codec_priv.data + extradata_offset,
1430
                       track->codec_priv.size);
1431
            }
1432
        }
1433

    
1434
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1435
            st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1436
            st->codec->codec_tag  = track->video.fourcc;
1437
            st->codec->width  = track->video.pixel_width;
1438
            st->codec->height = track->video.pixel_height;
1439
            av_reduce(&st->sample_aspect_ratio.num,
1440
                      &st->sample_aspect_ratio.den,
1441
                      st->codec->height * track->video.display_width,
1442
                      st->codec-> width * track->video.display_height,
1443
                      255);
1444
            if (st->codec->codec_id != CODEC_ID_H264)
1445
            st->need_parsing = AVSTREAM_PARSE_HEADERS;
1446
            if (track->default_duration)
1447
                st->avg_frame_rate = av_d2q(1000000000.0/track->default_duration, INT_MAX);
1448
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1449
            st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1450
            st->codec->sample_rate = track->audio.out_samplerate;
1451
            st->codec->channels = track->audio.channels;
1452
            if (st->codec->codec_id != CODEC_ID_AAC)
1453
            st->need_parsing = AVSTREAM_PARSE_HEADERS;
1454
        } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1455
            st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1456
        }
1457
    }
1458

    
1459
    attachements = attachements_list->elem;
1460
    for (j=0; j<attachements_list->nb_elem; j++) {
1461
        if (!(attachements[j].filename && attachements[j].mime &&
1462
              attachements[j].bin.data && attachements[j].bin.size > 0)) {
1463
            av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1464
        } else {
1465
            AVStream *st = av_new_stream(s, 0);
1466
            if (st == NULL)
1467
                break;
1468
            av_metadata_set2(&st->metadata, "filename",attachements[j].filename, 0);
1469
            st->codec->codec_id = CODEC_ID_NONE;
1470
            st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
1471
            st->codec->extradata  = av_malloc(attachements[j].bin.size);
1472
            if(st->codec->extradata == NULL)
1473
                break;
1474
            st->codec->extradata_size = attachements[j].bin.size;
1475
            memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1476

    
1477
            for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1478
                if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1479
                             strlen(ff_mkv_mime_tags[i].str))) {
1480
                    st->codec->codec_id = ff_mkv_mime_tags[i].id;
1481
                    break;
1482
                }
1483
            }
1484
            attachements[j].stream = st;
1485
        }
1486
    }
1487

    
1488
    chapters = chapters_list->elem;
1489
    for (i=0; i<chapters_list->nb_elem; i++)
1490
        if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
1491
            && (max_start==0 || chapters[i].start > max_start)) {
1492
            chapters[i].chapter =
1493
            ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1494
                           chapters[i].start, chapters[i].end,
1495
                           chapters[i].title);
1496
            av_metadata_set2(&chapters[i].chapter->metadata,
1497
                             "title", chapters[i].title, 0);
1498
            max_start = chapters[i].start;
1499
        }
1500

    
1501
    index_list = &matroska->index;
1502
    index = index_list->elem;
1503
    if (index_list->nb_elem
1504
        && index[0].time > 100000000000000/matroska->time_scale) {
1505
        av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1506
        index_scale = matroska->time_scale;
1507
    }
1508
    for (i=0; i<index_list->nb_elem; i++) {
1509
        EbmlList *pos_list = &index[i].pos;
1510
        MatroskaIndexPos *pos = pos_list->elem;
1511
        for (j=0; j<pos_list->nb_elem; j++) {
1512
            MatroskaTrack *track = matroska_find_track_by_num(matroska,
1513
                                                              pos[j].track);
1514
            if (track && track->stream)
1515
                av_add_index_entry(track->stream,
1516
                                   pos[j].pos + matroska->segment_start,
1517
                                   index[i].time/index_scale, 0, 0,
1518
                                   AVINDEX_KEYFRAME);
1519
        }
1520
    }
1521

    
1522
    matroska_convert_tags(s);
1523

    
1524
    return 0;
1525
}
1526

    
1527
/*
1528
 * Put one packet in an application-supplied AVPacket struct.
1529
 * Returns 0 on success or -1 on failure.
1530
 */
1531
static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1532
                                   AVPacket *pkt)
1533
{
1534
    if (matroska->num_packets > 0) {
1535
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1536
        av_free(matroska->packets[0]);
1537
        if (matroska->num_packets > 1) {
1538
            memmove(&matroska->packets[0], &matroska->packets[1],
1539
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
1540
            matroska->packets =
1541
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
1542
                           sizeof(AVPacket *));
1543
        } else {
1544
            av_freep(&matroska->packets);
1545
        }
1546
        matroska->num_packets--;
1547
        return 0;
1548
    }
1549

    
1550
    return -1;
1551
}
1552

    
1553
/*
1554
 * Free all packets in our internal queue.
1555
 */
1556
static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1557
{
1558
    if (matroska->packets) {
1559
        int n;
1560
        for (n = 0; n < matroska->num_packets; n++) {
1561
            av_free_packet(matroska->packets[n]);
1562
            av_free(matroska->packets[n]);
1563
        }
1564
        av_freep(&matroska->packets);
1565
        matroska->num_packets = 0;
1566
    }
1567
}
1568

    
1569
static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1570
                                int size, int64_t pos, uint64_t cluster_time,
1571
                                uint64_t duration, int is_keyframe,
1572
                                int64_t cluster_pos)
1573
{
1574
    uint64_t timecode = AV_NOPTS_VALUE;
1575
    MatroskaTrack *track;
1576
    int res = 0;
1577
    AVStream *st;
1578
    AVPacket *pkt;
1579
    int16_t block_time;
1580
    uint32_t *lace_size = NULL;
1581
    int n, flags, laces = 0;
1582
    uint64_t num;
1583

    
1584
    if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1585
        av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1586
        return res;
1587
    }
1588
    data += n;
1589
    size -= n;
1590

    
1591
    track = matroska_find_track_by_num(matroska, num);
1592
    if (size <= 3 || !track || !track->stream) {
1593
        av_log(matroska->ctx, AV_LOG_INFO,
1594
               "Invalid stream %"PRIu64" or size %u\n", num, size);
1595
        return res;
1596
    }
1597
    st = track->stream;
1598
    if (st->discard >= AVDISCARD_ALL)
1599
        return res;
1600
    if (duration == AV_NOPTS_VALUE)
1601
        duration = track->default_duration / matroska->time_scale;
1602

    
1603
    block_time = AV_RB16(data);
1604
    data += 2;
1605
    flags = *data++;
1606
    size -= 3;
1607
    if (is_keyframe == -1)
1608
        is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
1609

    
1610
    if (cluster_time != (uint64_t)-1
1611
        && (block_time >= 0 || cluster_time >= -block_time)) {
1612
        timecode = cluster_time + block_time;
1613
        if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
1614
            && timecode < track->end_timecode)
1615
            is_keyframe = 0;  /* overlapping subtitles are not key frame */
1616
        if (is_keyframe)
1617
            av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
1618
        track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
1619
    }
1620

    
1621
    if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1622
        if (!is_keyframe || timecode < matroska->skip_to_timecode)
1623
            return res;
1624
        matroska->skip_to_keyframe = 0;
1625
    }
1626

    
1627
    switch ((flags & 0x06) >> 1) {
1628
        case 0x0: /* no lacing */
1629
            laces = 1;
1630
            lace_size = av_mallocz(sizeof(int));
1631
            lace_size[0] = size;
1632
            break;
1633

    
1634
        case 0x1: /* Xiph lacing */
1635
        case 0x2: /* fixed-size lacing */
1636
        case 0x3: /* EBML lacing */
1637
            assert(size>0); // size <=3 is checked before size-=3 above
1638
            laces = (*data) + 1;
1639
            data += 1;
1640
            size -= 1;
1641
            lace_size = av_mallocz(laces * sizeof(int));
1642

    
1643
            switch ((flags & 0x06) >> 1) {
1644
                case 0x1: /* Xiph lacing */ {
1645
                    uint8_t temp;
1646
                    uint32_t total = 0;
1647
                    for (n = 0; res == 0 && n < laces - 1; n++) {
1648
                        while (1) {
1649
                            if (size == 0) {
1650
                                res = -1;
1651
                                break;
1652
                            }
1653
                            temp = *data;
1654
                            lace_size[n] += temp;
1655
                            data += 1;
1656
                            size -= 1;
1657
                            if (temp != 0xff)
1658
                                break;
1659
                        }
1660
                        total += lace_size[n];
1661
                    }
1662
                    lace_size[n] = size - total;
1663
                    break;
1664
                }
1665

    
1666
                case 0x2: /* fixed-size lacing */
1667
                    for (n = 0; n < laces; n++)
1668
                        lace_size[n] = size / laces;
1669
                    break;
1670

    
1671
                case 0x3: /* EBML lacing */ {
1672
                    uint32_t total;
1673
                    n = matroska_ebmlnum_uint(matroska, data, size, &num);
1674
                    if (n < 0) {
1675
                        av_log(matroska->ctx, AV_LOG_INFO,
1676
                               "EBML block data error\n");
1677
                        break;
1678
                    }
1679
                    data += n;
1680
                    size -= n;
1681
                    total = lace_size[0] = num;
1682
                    for (n = 1; res == 0 && n < laces - 1; n++) {
1683
                        int64_t snum;
1684
                        int r;
1685
                        r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1686
                        if (r < 0) {
1687
                            av_log(matroska->ctx, AV_LOG_INFO,
1688
                                   "EBML block data error\n");
1689
                            break;
1690
                        }
1691
                        data += r;
1692
                        size -= r;
1693
                        lace_size[n] = lace_size[n - 1] + snum;
1694
                        total += lace_size[n];
1695
                    }
1696
                    lace_size[n] = size - total;
1697
                    break;
1698
                }
1699
            }
1700
            break;
1701
    }
1702

    
1703
    if (res == 0) {
1704
        for (n = 0; n < laces; n++) {
1705
            if ((st->codec->codec_id == CODEC_ID_RA_288 ||
1706
                 st->codec->codec_id == CODEC_ID_COOK ||
1707
                 st->codec->codec_id == CODEC_ID_SIPR ||
1708
                 st->codec->codec_id == CODEC_ID_ATRAC3) &&
1709
                 st->codec->block_align && track->audio.sub_packet_size) {
1710
                int a = st->codec->block_align;
1711
                int sps = track->audio.sub_packet_size;
1712
                int cfs = track->audio.coded_framesize;
1713
                int h = track->audio.sub_packet_h;
1714
                int y = track->audio.sub_packet_cnt;
1715
                int w = track->audio.frame_size;
1716
                int x;
1717

    
1718
                if (!track->audio.pkt_cnt) {
1719
                    if (st->codec->codec_id == CODEC_ID_RA_288)
1720
                        for (x=0; x<h/2; x++)
1721
                            memcpy(track->audio.buf+x*2*w+y*cfs,
1722
                                   data+x*cfs, cfs);
1723
                    else if (st->codec->codec_id == CODEC_ID_SIPR)
1724
                        memcpy(track->audio.buf + y*w, data, w);
1725
                    else
1726
                        for (x=0; x<w/sps; x++)
1727
                            memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1728

    
1729
                    if (++track->audio.sub_packet_cnt >= h) {
1730
                        if (st->codec->codec_id == CODEC_ID_SIPR)
1731
                            ff_rm_reorder_sipr_data(track->audio.buf, h, w);
1732
                        track->audio.sub_packet_cnt = 0;
1733
                        track->audio.pkt_cnt = h*w / a;
1734
                    }
1735
                }
1736
                while (track->audio.pkt_cnt) {
1737
                    pkt = av_mallocz(sizeof(AVPacket));
1738
                    av_new_packet(pkt, a);
1739
                    memcpy(pkt->data, track->audio.buf
1740
                           + a * (h*w / a - track->audio.pkt_cnt--), a);
1741
                    pkt->pos = pos;
1742
                    pkt->stream_index = st->index;
1743
                    dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1744
                }
1745
            } else {
1746
                MatroskaTrackEncoding *encodings = track->encodings.elem;
1747
                int offset = 0, pkt_size = lace_size[n];
1748
                uint8_t *pkt_data = data;
1749

    
1750
                if (pkt_size > size) {
1751
                    av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
1752
                    break;
1753
                }
1754

    
1755
                if (encodings && encodings->scope & 1) {
1756
                    offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1757
                    if (offset < 0)
1758
                        continue;
1759
                }
1760

    
1761
                pkt = av_mallocz(sizeof(AVPacket));
1762
                /* XXX: prevent data copy... */
1763
                if (av_new_packet(pkt, pkt_size+offset) < 0) {
1764
                    av_free(pkt);
1765
                    res = AVERROR(ENOMEM);
1766
                    break;
1767
                }
1768
                if (offset)
1769
                    memcpy (pkt->data, encodings->compression.settings.data, offset);
1770
                memcpy (pkt->data+offset, pkt_data, pkt_size);
1771

    
1772
                if (pkt_data != data)
1773
                    av_free(pkt_data);
1774

    
1775
                if (n == 0)
1776
                    pkt->flags = is_keyframe;
1777
                pkt->stream_index = st->index;
1778

    
1779
                if (track->ms_compat)
1780
                    pkt->dts = timecode;
1781
                else
1782
                    pkt->pts = timecode;
1783
                pkt->pos = pos;
1784
                if (st->codec->codec_id == CODEC_ID_TEXT)
1785
                    pkt->convergence_duration = duration;
1786
                else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1787
                    pkt->duration = duration;
1788

    
1789
                if (st->codec->codec_id == CODEC_ID_SSA)
1790
                    matroska_fix_ass_packet(matroska, pkt, duration);
1791

    
1792
                if (matroska->prev_pkt &&
1793
                    timecode != AV_NOPTS_VALUE &&
1794
                    matroska->prev_pkt->pts == timecode &&
1795
                    matroska->prev_pkt->stream_index == st->index &&
1796
                    st->codec->codec_id == CODEC_ID_SSA)
1797
                    matroska_merge_packets(matroska->prev_pkt, pkt);
1798
                else {
1799
                    dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1800
                    matroska->prev_pkt = pkt;
1801
                }
1802
            }
1803

    
1804
            if (timecode != AV_NOPTS_VALUE)
1805
                timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1806
            data += lace_size[n];
1807
            size -= lace_size[n];
1808
        }
1809
    }
1810

    
1811
    av_free(lace_size);
1812
    return res;
1813
}
1814

    
1815
static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1816
{
1817
    MatroskaCluster cluster = { 0 };
1818
    EbmlList *blocks_list;
1819
    MatroskaBlock *blocks;
1820
    int i, res;
1821
    int64_t pos = url_ftell(matroska->ctx->pb);
1822
    matroska->prev_pkt = NULL;
1823
    if (matroska->current_id)
1824
        pos -= 4;  /* sizeof the ID which was already read */
1825
    res = ebml_parse(matroska, matroska_clusters, &cluster);
1826
    blocks_list = &cluster.blocks;
1827
    blocks = blocks_list->elem;
1828
    for (i=0; i<blocks_list->nb_elem; i++)
1829
        if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
1830
            int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
1831
            res=matroska_parse_block(matroska,
1832
                                     blocks[i].bin.data, blocks[i].bin.size,
1833
                                     blocks[i].bin.pos,  cluster.timecode,
1834
                                     blocks[i].duration, is_keyframe,
1835
                                     pos);
1836
        }
1837
    ebml_free(matroska_cluster, &cluster);
1838
    if (res < 0)  matroska->done = 1;
1839
    return res;
1840
}
1841

    
1842
static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1843
{
1844
    MatroskaDemuxContext *matroska = s->priv_data;
1845

    
1846
    while (matroska_deliver_packet(matroska, pkt)) {
1847
        if (matroska->done)
1848
            return AVERROR_EOF;
1849
        matroska_parse_cluster(matroska);
1850
    }
1851

    
1852
    return 0;
1853
}
1854

    
1855
static int matroska_read_seek(AVFormatContext *s, int stream_index,
1856
                              int64_t timestamp, int flags)
1857
{
1858
    MatroskaDemuxContext *matroska = s->priv_data;
1859
    MatroskaTrack *tracks = matroska->tracks.elem;
1860
    AVStream *st = s->streams[stream_index];
1861
    int i, index, index_sub, index_min;
1862

    
1863
    if (!st->nb_index_entries)
1864
        return 0;
1865
    timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
1866

    
1867
    if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1868
        url_fseek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
1869
        while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1870
            matroska_clear_queue(matroska);
1871
            if (matroska_parse_cluster(matroska) < 0)
1872
                break;
1873
        }
1874
    }
1875

    
1876
    matroska_clear_queue(matroska);
1877
    if (index < 0)
1878
        return 0;
1879

    
1880
    index_min = index;
1881
    for (i=0; i < matroska->tracks.nb_elem; i++) {
1882
        tracks[i].end_timecode = 0;
1883
        if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
1884
            && !tracks[i].stream->discard != AVDISCARD_ALL) {
1885
            index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
1886
            if (index_sub >= 0
1887
                && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
1888
                && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
1889
                index_min = index_sub;
1890
        }
1891
    }
1892

    
1893
    url_fseek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
1894
    matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1895
    matroska->skip_to_timecode = st->index_entries[index].timestamp;
1896
    matroska->done = 0;
1897
    av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1898
    return 0;
1899
}
1900

    
1901
static int matroska_read_close(AVFormatContext *s)
1902
{
1903
    MatroskaDemuxContext *matroska = s->priv_data;
1904
    MatroskaTrack *tracks = matroska->tracks.elem;
1905
    int n;
1906

    
1907
    matroska_clear_queue(matroska);
1908

    
1909
    for (n=0; n < matroska->tracks.nb_elem; n++)
1910
        if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1911
            av_free(tracks[n].audio.buf);
1912
    ebml_free(matroska_segment, matroska);
1913

    
1914
    return 0;
1915
}
1916

    
1917
AVInputFormat matroska_demuxer = {
1918
    "matroska,webm",
1919
    NULL_IF_CONFIG_SMALL("Matroska/WebM file format"),
1920
    sizeof(MatroskaDemuxContext),
1921
    matroska_probe,
1922
    matroska_read_header,
1923
    matroska_read_packet,
1924
    matroska_read_close,
1925
    matroska_read_seek,
1926
    .metadata_conv = ff_mkv_metadata_conv,
1927
};