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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;
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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;
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typedef struct {
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    uint64_t version;
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    uint64_t max_size;
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    uint64_t id_length;
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    char    *doctype;
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    uint64_t doctype_version;
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} Ebml;
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;
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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;
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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;
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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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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 }
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};
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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
};
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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) },
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    { 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} },
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    { 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} },
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    { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
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    { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
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    { MATROSKA_ID_CODECNAME,            EBML_NONE },
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    { MATROSKA_ID_CODECDECODEALL,       EBML_NONE },
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    { MATROSKA_ID_CODECINFOURL,         EBML_NONE },
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    { MATROSKA_ID_CODECDOWNLOADURL,     EBML_NONE },
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    { MATROSKA_ID_TRACKMINCACHE,        EBML_NONE },
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    { MATROSKA_ID_TRACKMAXCACHE,        EBML_NONE },
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    { MATROSKA_ID_TRACKMAXBLKADDID,     EBML_NONE },
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    { 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} },
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    { 0 }
359
};
360

    
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static EbmlSyntax matroska_attachment[] = {
362
    { MATROSKA_ID_FILEUID,            EBML_UINT, 0, offsetof(MatroskaAttachement,uid) },
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    { MATROSKA_ID_FILENAME,           EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
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    { MATROSKA_ID_FILEMIMETYPE,       EBML_STR,  0, offsetof(MatroskaAttachement,mime) },
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    { MATROSKA_ID_FILEDATA,           EBML_BIN,  0, offsetof(MatroskaAttachement,bin) },
366
    { MATROSKA_ID_FILEDESC,           EBML_NONE },
367
    { 0 }
368
};
369

    
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static EbmlSyntax matroska_attachments[] = {
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    { 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 len_mask = 0x80, read = 1, n = 1;
542
    int64_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
    while (read <= max_size && !(total & len_mask)) {
560
        read++;
561
        len_mask >>= 1;
562
    }
563
    if (read > max_size) {
564
        int64_t pos = url_ftell(pb) - 1;
565
        av_log(matroska->ctx, AV_LOG_ERROR,
566
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
567
               (uint8_t) total, pos, pos);
568
        return AVERROR_INVALIDDATA;
569
    }
570

    
571
    /* read out length */
572
    total &= ~len_mask;
573
    while (n++ < read)
574
        total = (total << 8) | get_byte(pb);
575

    
576
    *number = total;
577

    
578
    return read;
579
}
580

    
581
/*
582
 * Read the next element as an unsigned int.
583
 * 0 is success, < 0 is failure.
584
 */
585
static int ebml_read_uint(ByteIOContext *pb, int size, uint64_t *num)
586
{
587
    int n = 0;
588

    
589
    if (size < 1 || size > 8)
590
        return AVERROR_INVALIDDATA;
591

    
592
    /* big-endian ordering; build up number */
593
    *num = 0;
594
    while (n++ < size)
595
        *num = (*num << 8) | get_byte(pb);
596

    
597
    return 0;
598
}
599

    
600
/*
601
 * Read the next element as a float.
602
 * 0 is success, < 0 is failure.
603
 */
604
static int ebml_read_float(ByteIOContext *pb, int size, double *num)
605
{
606
    if (size == 4) {
607
        *num= av_int2flt(get_be32(pb));
608
    } else if(size==8){
609
        *num= av_int2dbl(get_be64(pb));
610
    } else
611
        return AVERROR_INVALIDDATA;
612

    
613
    return 0;
614
}
615

    
616
/*
617
 * Read the next element as an ASCII string.
618
 * 0 is success, < 0 is failure.
619
 */
620
static int ebml_read_ascii(ByteIOContext *pb, int size, char **str)
621
{
622
    av_free(*str);
623
    /* EBML strings are usually not 0-terminated, so we allocate one
624
     * byte more, read the string and NULL-terminate it ourselves. */
625
    if (!(*str = av_malloc(size + 1)))
626
        return AVERROR(ENOMEM);
627
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
628
        av_freep(str);
629
        return AVERROR(EIO);
630
    }
631
    (*str)[size] = '\0';
632

    
633
    return 0;
634
}
635

    
636
/*
637
 * Read the next element as binary data.
638
 * 0 is success, < 0 is failure.
639
 */
640
static int ebml_read_binary(ByteIOContext *pb, int length, EbmlBin *bin)
641
{
642
    av_free(bin->data);
643
    if (!(bin->data = av_malloc(length)))
644
        return AVERROR(ENOMEM);
645

    
646
    bin->size = length;
647
    bin->pos  = url_ftell(pb);
648
    if (get_buffer(pb, bin->data, length) != length) {
649
        av_freep(&bin->data);
650
        return AVERROR(EIO);
651
    }
652

    
653
    return 0;
654
}
655

    
656
/*
657
 * Read the next element, but only the header. The contents
658
 * are supposed to be sub-elements which can be read separately.
659
 * 0 is success, < 0 is failure.
660
 */
661
static int ebml_read_master(MatroskaDemuxContext *matroska, uint64_t length)
662
{
663
    ByteIOContext *pb = matroska->ctx->pb;
664
    MatroskaLevel *level;
665

    
666
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
667
        av_log(matroska->ctx, AV_LOG_ERROR,
668
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
669
        return AVERROR(ENOSYS);
670
    }
671

    
672
    level = &matroska->levels[matroska->num_levels++];
673
    level->start = url_ftell(pb);
674
    level->length = length;
675

    
676
    return 0;
677
}
678

    
679
/*
680
 * Read signed/unsigned "EBML" numbers.
681
 * Return: number of bytes processed, < 0 on error
682
 */
683
static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
684
                                 uint8_t *data, uint32_t size, uint64_t *num)
685
{
686
    ByteIOContext pb;
687
    init_put_byte(&pb, data, size, 0, NULL, NULL, NULL, NULL);
688
    return ebml_read_num(matroska, &pb, FFMIN(size, 8), num);
689
}
690

    
691
/*
692
 * Same as above, but signed.
693
 */
694
static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
695
                                 uint8_t *data, uint32_t size, int64_t *num)
696
{
697
    uint64_t unum;
698
    int res;
699

    
700
    /* read as unsigned number first */
701
    if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
702
        return res;
703

    
704
    /* make signed (weird way) */
705
    *num = unum - ((1LL << (7*res - 1)) - 1);
706

    
707
    return res;
708
}
709

    
710
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
711
                           EbmlSyntax *syntax, void *data);
712

    
713
static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
714
                         uint32_t id, void *data)
715
{
716
    int i;
717
    for (i=0; syntax[i].id; i++)
718
        if (id == syntax[i].id)
719
            break;
720
    if (!syntax[i].id && id == MATROSKA_ID_CLUSTER &&
721
        matroska->num_levels > 0 &&
722
        matroska->levels[matroska->num_levels-1].length == 0xffffffffffffff)
723
        return 0;  // we reached the end of an unknown size cluster
724
    if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
725
        av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
726
    return ebml_parse_elem(matroska, &syntax[i], data);
727
}
728

    
729
static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
730
                      void *data)
731
{
732
    if (!matroska->current_id) {
733
        uint64_t id;
734
        int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
735
        if (res < 0)
736
            return res;
737
        matroska->current_id = id | 1 << 7*res;
738
    }
739
    return ebml_parse_id(matroska, syntax, matroska->current_id, data);
740
}
741

    
742
static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
743
                           void *data)
744
{
745
    int i, res = 0;
746

    
747
    for (i=0; syntax[i].id; i++)
748
        switch (syntax[i].type) {
749
        case EBML_UINT:
750
            *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
751
            break;
752
        case EBML_FLOAT:
753
            *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
754
            break;
755
        case EBML_STR:
756
        case EBML_UTF8:
757
            *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
758
            break;
759
        }
760

    
761
    while (!res && !ebml_level_end(matroska))
762
        res = ebml_parse(matroska, syntax, data);
763

    
764
    return res;
765
}
766

    
767
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
768
                           EbmlSyntax *syntax, void *data)
769
{
770
    ByteIOContext *pb = matroska->ctx->pb;
771
    uint32_t id = syntax->id;
772
    uint64_t length;
773
    int res;
774

    
775
    data = (char *)data + syntax->data_offset;
776
    if (syntax->list_elem_size) {
777
        EbmlList *list = data;
778
        list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
779
        data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
780
        memset(data, 0, syntax->list_elem_size);
781
        list->nb_elem++;
782
    }
783

    
784
    if (syntax->type != EBML_PASS && syntax->type != EBML_STOP) {
785
        matroska->current_id = 0;
786
        if ((res = ebml_read_num(matroska, pb, 8, &length)) < 0)
787
            return res;
788
    }
789

    
790
    switch (syntax->type) {
791
    case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
792
    case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
793
    case EBML_STR:
794
    case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
795
    case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
796
    case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
797
                         return res;
798
                     if (id == MATROSKA_ID_SEGMENT)
799
                         matroska->segment_start = url_ftell(matroska->ctx->pb);
800
                     return ebml_parse_nest(matroska, syntax->def.n, data);
801
    case EBML_PASS:  return ebml_parse_id(matroska, syntax->def.n, id, data);
802
    case EBML_STOP:  return 1;
803
    default:         return url_fseek(pb,length,SEEK_CUR)<0 ? AVERROR(EIO) : 0;
804
    }
805
    if (res == AVERROR_INVALIDDATA)
806
        av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
807
    else if (res == AVERROR(EIO))
808
        av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
809
    return res;
810
}
811

    
812
static void ebml_free(EbmlSyntax *syntax, void *data)
813
{
814
    int i, j;
815
    for (i=0; syntax[i].id; i++) {
816
        void *data_off = (char *)data + syntax[i].data_offset;
817
        switch (syntax[i].type) {
818
        case EBML_STR:
819
        case EBML_UTF8:  av_freep(data_off);                      break;
820
        case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
821
        case EBML_NEST:
822
            if (syntax[i].list_elem_size) {
823
                EbmlList *list = data_off;
824
                char *ptr = list->elem;
825
                for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
826
                    ebml_free(syntax[i].def.n, ptr);
827
                av_free(list->elem);
828
            } else
829
                ebml_free(syntax[i].def.n, data_off);
830
        default:  break;
831
        }
832
    }
833
}
834

    
835

    
836
/*
837
 * Autodetecting...
838
 */
839
static int matroska_probe(AVProbeData *p)
840
{
841
    uint64_t total = 0;
842
    int len_mask = 0x80, size = 1, n = 1, i;
843

    
844
    /* EBML header? */
845
    if (AV_RB32(p->buf) != EBML_ID_HEADER)
846
        return 0;
847

    
848
    /* length of header */
849
    total = p->buf[4];
850
    while (size <= 8 && !(total & len_mask)) {
851
        size++;
852
        len_mask >>= 1;
853
    }
854
    if (size > 8)
855
      return 0;
856
    total &= (len_mask - 1);
857
    while (n < size)
858
        total = (total << 8) | p->buf[4 + n++];
859

    
860
    /* Does the probe data contain the whole header? */
861
    if (p->buf_size < 4 + size + total)
862
      return 0;
863

    
864
    /* The header should contain a known document type. For now,
865
     * we don't parse the whole header but simply check for the
866
     * availability of that array of characters inside the header.
867
     * Not fully fool-proof, but good enough. */
868
    for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++) {
869
        int probelen = strlen(matroska_doctypes[i]);
870
        for (n = 4+size; n <= 4+size+total-probelen; n++)
871
            if (!memcmp(p->buf+n, matroska_doctypes[i], probelen))
872
                return AVPROBE_SCORE_MAX;
873
    }
874

    
875
    // probably valid EBML header but no recognized doctype
876
    return AVPROBE_SCORE_MAX/2;
877
}
878

    
879
static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
880
                                                 int num)
881
{
882
    MatroskaTrack *tracks = matroska->tracks.elem;
883
    int i;
884

    
885
    for (i=0; i < matroska->tracks.nb_elem; i++)
886
        if (tracks[i].num == num)
887
            return &tracks[i];
888

    
889
    av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
890
    return NULL;
891
}
892

    
893
static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
894
                                  MatroskaTrack *track)
895
{
896
    MatroskaTrackEncoding *encodings = track->encodings.elem;
897
    uint8_t* data = *buf;
898
    int isize = *buf_size;
899
    uint8_t* pkt_data = NULL;
900
    int pkt_size = isize;
901
    int result = 0;
902
    int olen;
903

    
904
    if (pkt_size >= 10000000)
905
        return -1;
906

    
907
    switch (encodings[0].compression.algo) {
908
    case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
909
        return encodings[0].compression.settings.size;
910
    case MATROSKA_TRACK_ENCODING_COMP_LZO:
911
        do {
912
            olen = pkt_size *= 3;
913
            pkt_data = av_realloc(pkt_data, pkt_size+AV_LZO_OUTPUT_PADDING);
914
            result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
915
        } while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
916
        if (result)
917
            goto failed;
918
        pkt_size -= olen;
919
        break;
920
#if CONFIG_ZLIB
921
    case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
922
        z_stream zstream = {0};
923
        if (inflateInit(&zstream) != Z_OK)
924
            return -1;
925
        zstream.next_in = data;
926
        zstream.avail_in = isize;
927
        do {
928
            pkt_size *= 3;
929
            pkt_data = av_realloc(pkt_data, pkt_size);
930
            zstream.avail_out = pkt_size - zstream.total_out;
931
            zstream.next_out = pkt_data + zstream.total_out;
932
            result = inflate(&zstream, Z_NO_FLUSH);
933
        } while (result==Z_OK && pkt_size<10000000);
934
        pkt_size = zstream.total_out;
935
        inflateEnd(&zstream);
936
        if (result != Z_STREAM_END)
937
            goto failed;
938
        break;
939
    }
940
#endif
941
#if CONFIG_BZLIB
942
    case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
943
        bz_stream bzstream = {0};
944
        if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
945
            return -1;
946
        bzstream.next_in = data;
947
        bzstream.avail_in = isize;
948
        do {
949
            pkt_size *= 3;
950
            pkt_data = av_realloc(pkt_data, pkt_size);
951
            bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
952
            bzstream.next_out = pkt_data + bzstream.total_out_lo32;
953
            result = BZ2_bzDecompress(&bzstream);
954
        } while (result==BZ_OK && pkt_size<10000000);
955
        pkt_size = bzstream.total_out_lo32;
956
        BZ2_bzDecompressEnd(&bzstream);
957
        if (result != BZ_STREAM_END)
958
            goto failed;
959
        break;
960
    }
961
#endif
962
    default:
963
        return -1;
964
    }
965

    
966
    *buf = pkt_data;
967
    *buf_size = pkt_size;
968
    return 0;
969
 failed:
970
    av_free(pkt_data);
971
    return -1;
972
}
973

    
974
static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
975
                                    AVPacket *pkt, uint64_t display_duration)
976
{
977
    char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
978
    for (; *ptr!=',' && ptr<end-1; ptr++);
979
    if (*ptr == ',')
980
        layer = ++ptr;
981
    for (; *ptr!=',' && ptr<end-1; ptr++);
982
    if (*ptr == ',') {
983
        int64_t end_pts = pkt->pts + display_duration;
984
        int sc = matroska->time_scale * pkt->pts / 10000000;
985
        int ec = matroska->time_scale * end_pts  / 10000000;
986
        int sh, sm, ss, eh, em, es, len;
987
        sh = sc/360000;  sc -= 360000*sh;
988
        sm = sc/  6000;  sc -=   6000*sm;
989
        ss = sc/   100;  sc -=    100*ss;
990
        eh = ec/360000;  ec -= 360000*eh;
991
        em = ec/  6000;  ec -=   6000*em;
992
        es = ec/   100;  ec -=    100*es;
993
        *ptr++ = '\0';
994
        len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
995
        if (!(line = av_malloc(len)))
996
            return;
997
        snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
998
                 layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
999
        av_free(pkt->data);
1000
        pkt->data = line;
1001
        pkt->size = strlen(line);
1002
    }
1003
}
1004

    
1005
static void matroska_merge_packets(AVPacket *out, AVPacket *in)
1006
{
1007
    out->data = av_realloc(out->data, out->size+in->size);
1008
    memcpy(out->data+out->size, in->data, in->size);
1009
    out->size += in->size;
1010
    av_destruct_packet(in);
1011
    av_free(in);
1012
}
1013

    
1014
static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
1015
                                 AVMetadata **metadata, char *prefix)
1016
{
1017
    MatroskaTag *tags = list->elem;
1018
    char key[1024];
1019
    int i;
1020

    
1021
    for (i=0; i < list->nb_elem; i++) {
1022
        const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1023
        if (prefix)  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1024
        else         av_strlcpy(key, tags[i].name, sizeof(key));
1025
        if (tags[i].def || !lang) {
1026
        av_metadata_set2(metadata, key, tags[i].string, 0);
1027
        if (tags[i].sub.nb_elem)
1028
            matroska_convert_tag(s, &tags[i].sub, metadata, key);
1029
        }
1030
        if (lang) {
1031
            av_strlcat(key, "-", sizeof(key));
1032
            av_strlcat(key, lang, sizeof(key));
1033
            av_metadata_set2(metadata, key, tags[i].string, 0);
1034
            if (tags[i].sub.nb_elem)
1035
                matroska_convert_tag(s, &tags[i].sub, metadata, key);
1036
        }
1037
    }
1038
}
1039

    
1040
static void matroska_convert_tags(AVFormatContext *s)
1041
{
1042
    MatroskaDemuxContext *matroska = s->priv_data;
1043
    MatroskaTags *tags = matroska->tags.elem;
1044
    int i, j;
1045

    
1046
    for (i=0; i < matroska->tags.nb_elem; i++) {
1047
        if (tags[i].target.attachuid) {
1048
            MatroskaAttachement *attachment = matroska->attachments.elem;
1049
            for (j=0; j<matroska->attachments.nb_elem; j++)
1050
                if (attachment[j].uid == tags[i].target.attachuid)
1051
                    matroska_convert_tag(s, &tags[i].tag,
1052
                                         &attachment[j].stream->metadata, NULL);
1053
        } else if (tags[i].target.chapteruid) {
1054
            MatroskaChapter *chapter = matroska->chapters.elem;
1055
            for (j=0; j<matroska->chapters.nb_elem; j++)
1056
                if (chapter[j].uid == tags[i].target.chapteruid)
1057
                    matroska_convert_tag(s, &tags[i].tag,
1058
                                         &chapter[j].chapter->metadata, NULL);
1059
        } else if (tags[i].target.trackuid) {
1060
            MatroskaTrack *track = matroska->tracks.elem;
1061
            for (j=0; j<matroska->tracks.nb_elem; j++)
1062
                if (track[j].uid == tags[i].target.trackuid)
1063
                    matroska_convert_tag(s, &tags[i].tag,
1064
                                         &track[j].stream->metadata, NULL);
1065
        } else {
1066
            matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1067
                                 tags[i].target.type);
1068
        }
1069
    }
1070
}
1071

    
1072
static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1073
{
1074
    EbmlList *seekhead_list = &matroska->seekhead;
1075
    MatroskaSeekhead *seekhead = seekhead_list->elem;
1076
    uint32_t level_up = matroska->level_up;
1077
    int64_t before_pos = url_ftell(matroska->ctx->pb);
1078
    uint32_t saved_id = matroska->current_id;
1079
    MatroskaLevel level;
1080
    int i;
1081

    
1082
    // we should not do any seeking in the streaming case
1083
    if (url_is_streamed(matroska->ctx->pb) ||
1084
        (matroska->ctx->flags & AVFMT_FLAG_IGNIDX))
1085
        return;
1086

    
1087
    for (i=0; i<seekhead_list->nb_elem; i++) {
1088
        int64_t offset = seekhead[i].pos + matroska->segment_start;
1089

    
1090
        if (seekhead[i].pos <= before_pos
1091
            || seekhead[i].id == MATROSKA_ID_SEEKHEAD
1092
            || seekhead[i].id == MATROSKA_ID_CLUSTER)
1093
            continue;
1094

    
1095
        /* seek */
1096
        if (url_fseek(matroska->ctx->pb, offset, SEEK_SET) != offset)
1097
            continue;
1098

    
1099
        /* We don't want to lose our seekhead level, so we add
1100
         * a dummy. This is a crude hack. */
1101
        if (matroska->num_levels == EBML_MAX_DEPTH) {
1102
            av_log(matroska->ctx, AV_LOG_INFO,
1103
                   "Max EBML element depth (%d) reached, "
1104
                   "cannot parse further.\n", EBML_MAX_DEPTH);
1105
            break;
1106
        }
1107

    
1108
        level.start = 0;
1109
        level.length = (uint64_t)-1;
1110
        matroska->levels[matroska->num_levels] = level;
1111
        matroska->num_levels++;
1112
        matroska->current_id = 0;
1113

    
1114
        ebml_parse(matroska, matroska_segment, matroska);
1115

    
1116
        /* remove dummy level */
1117
        while (matroska->num_levels) {
1118
            uint64_t length = matroska->levels[--matroska->num_levels].length;
1119
            if (length == (uint64_t)-1)
1120
                break;
1121
        }
1122
    }
1123

    
1124
    /* seek back */
1125
    url_fseek(matroska->ctx->pb, before_pos, SEEK_SET);
1126
    matroska->level_up = level_up;
1127
    matroska->current_id = saved_id;
1128
}
1129

    
1130
static int matroska_aac_profile(char *codec_id)
1131
{
1132
    static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1133
    int profile;
1134

    
1135
    for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1136
        if (strstr(codec_id, aac_profiles[profile]))
1137
            break;
1138
    return profile + 1;
1139
}
1140

    
1141
static int matroska_aac_sri(int samplerate)
1142
{
1143
    int sri;
1144

    
1145
    for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
1146
        if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1147
            break;
1148
    return sri;
1149
}
1150

    
1151
static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1152
{
1153
    MatroskaDemuxContext *matroska = s->priv_data;
1154
    EbmlList *attachements_list = &matroska->attachments;
1155
    MatroskaAttachement *attachements;
1156
    EbmlList *chapters_list = &matroska->chapters;
1157
    MatroskaChapter *chapters;
1158
    MatroskaTrack *tracks;
1159
    EbmlList *index_list;
1160
    MatroskaIndex *index;
1161
    int index_scale = 1;
1162
    uint64_t max_start = 0;
1163
    Ebml ebml = { 0 };
1164
    AVStream *st;
1165
    int i, j, res;
1166

    
1167
    matroska->ctx = s;
1168

    
1169
    /* First read the EBML header. */
1170
    if (ebml_parse(matroska, ebml_syntax, &ebml)
1171
        || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1172
        || ebml.id_length > sizeof(uint32_t) || ebml.doctype_version > 2) {
1173
        av_log(matroska->ctx, AV_LOG_ERROR,
1174
               "EBML header using unsupported features\n"
1175
               "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1176
               ebml.version, ebml.doctype, ebml.doctype_version);
1177
        ebml_free(ebml_syntax, &ebml);
1178
        return AVERROR_PATCHWELCOME;
1179
    }
1180
    for (i = 0; i < FF_ARRAY_ELEMS(matroska_doctypes); i++)
1181
        if (!strcmp(ebml.doctype, matroska_doctypes[i]))
1182
            break;
1183
    if (i >= FF_ARRAY_ELEMS(matroska_doctypes)) {
1184
        av_log(s, AV_LOG_WARNING, "Unknown EBML doctype '%s'\n", ebml.doctype);
1185
    }
1186
    ebml_free(ebml_syntax, &ebml);
1187

    
1188
    /* The next thing is a segment. */
1189
    if ((res = ebml_parse(matroska, matroska_segments, matroska)) < 0)
1190
        return res;
1191
    matroska_execute_seekhead(matroska);
1192

    
1193
    if (!matroska->time_scale)
1194
        matroska->time_scale = 1000000;
1195
    if (matroska->duration)
1196
        matroska->ctx->duration = matroska->duration * matroska->time_scale
1197
                                  * 1000 / AV_TIME_BASE;
1198
    av_metadata_set2(&s->metadata, "title", matroska->title, 0);
1199

    
1200
    tracks = matroska->tracks.elem;
1201
    for (i=0; i < matroska->tracks.nb_elem; i++) {
1202
        MatroskaTrack *track = &tracks[i];
1203
        enum CodecID codec_id = CODEC_ID_NONE;
1204
        EbmlList *encodings_list = &tracks->encodings;
1205
        MatroskaTrackEncoding *encodings = encodings_list->elem;
1206
        uint8_t *extradata = NULL;
1207
        int extradata_size = 0;
1208
        int extradata_offset = 0;
1209
        ByteIOContext b;
1210

    
1211
        /* Apply some sanity checks. */
1212
        if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1213
            track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1214
            track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1215
            av_log(matroska->ctx, AV_LOG_INFO,
1216
                   "Unknown or unsupported track type %"PRIu64"\n",
1217
                   track->type);
1218
            continue;
1219
        }
1220
        if (track->codec_id == NULL)
1221
            continue;
1222

    
1223
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1224
            if (!track->default_duration)
1225
                track->default_duration = 1000000000/track->video.frame_rate;
1226
            if (!track->video.display_width)
1227
                track->video.display_width = track->video.pixel_width;
1228
            if (!track->video.display_height)
1229
                track->video.display_height = track->video.pixel_height;
1230
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1231
            if (!track->audio.out_samplerate)
1232
                track->audio.out_samplerate = track->audio.samplerate;
1233
        }
1234
        if (encodings_list->nb_elem > 1) {
1235
            av_log(matroska->ctx, AV_LOG_ERROR,
1236
                   "Multiple combined encodings no supported");
1237
        } else if (encodings_list->nb_elem == 1) {
1238
            if (encodings[0].type ||
1239
                (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1240
#if CONFIG_ZLIB
1241
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1242
#endif
1243
#if CONFIG_BZLIB
1244
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1245
#endif
1246
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1247
                encodings[0].scope = 0;
1248
                av_log(matroska->ctx, AV_LOG_ERROR,
1249
                       "Unsupported encoding type");
1250
            } else if (track->codec_priv.size && encodings[0].scope&2) {
1251
                uint8_t *codec_priv = track->codec_priv.data;
1252
                int offset = matroska_decode_buffer(&track->codec_priv.data,
1253
                                                    &track->codec_priv.size,
1254
                                                    track);
1255
                if (offset < 0) {
1256
                    track->codec_priv.data = NULL;
1257
                    track->codec_priv.size = 0;
1258
                    av_log(matroska->ctx, AV_LOG_ERROR,
1259
                           "Failed to decode codec private data\n");
1260
                } else if (offset > 0) {
1261
                    track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1262
                    memcpy(track->codec_priv.data,
1263
                           encodings[0].compression.settings.data, offset);
1264
                    memcpy(track->codec_priv.data+offset, codec_priv,
1265
                           track->codec_priv.size);
1266
                    track->codec_priv.size += offset;
1267
                }
1268
                if (codec_priv != track->codec_priv.data)
1269
                    av_free(codec_priv);
1270
            }
1271
        }
1272

    
1273
        for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1274
            if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1275
                        strlen(ff_mkv_codec_tags[j].str))){
1276
                codec_id= ff_mkv_codec_tags[j].id;
1277
                break;
1278
            }
1279
        }
1280

    
1281
        st = track->stream = av_new_stream(s, 0);
1282
        if (st == NULL)
1283
            return AVERROR(ENOMEM);
1284

    
1285
        if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1286
            && track->codec_priv.size >= 40
1287
            && track->codec_priv.data != NULL) {
1288
            track->ms_compat = 1;
1289
            track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1290
            codec_id = ff_codec_get_id(ff_codec_bmp_tags, track->video.fourcc);
1291
            extradata_offset = 40;
1292
        } else if (!strcmp(track->codec_id, "A_MS/ACM")
1293
                   && track->codec_priv.size >= 14
1294
                   && track->codec_priv.data != NULL) {
1295
            init_put_byte(&b, track->codec_priv.data, track->codec_priv.size,
1296
                          URL_RDONLY, NULL, NULL, NULL, NULL);
1297
            ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1298
            codec_id = st->codec->codec_id;
1299
            extradata_offset = FFMIN(track->codec_priv.size, 18);
1300
        } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1301
                   && (track->codec_priv.size >= 86)
1302
                   && (track->codec_priv.data != NULL)) {
1303
            track->video.fourcc = AV_RL32(track->codec_priv.data);
1304
            codec_id=ff_codec_get_id(codec_movvideo_tags, track->video.fourcc);
1305
        } else if (codec_id == CODEC_ID_PCM_S16BE) {
1306
            switch (track->audio.bitdepth) {
1307
            case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1308
            case 24:  codec_id = CODEC_ID_PCM_S24BE;  break;
1309
            case 32:  codec_id = CODEC_ID_PCM_S32BE;  break;
1310
            }
1311
        } else if (codec_id == CODEC_ID_PCM_S16LE) {
1312
            switch (track->audio.bitdepth) {
1313
            case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1314
            case 24:  codec_id = CODEC_ID_PCM_S24LE;  break;
1315
            case 32:  codec_id = CODEC_ID_PCM_S32LE;  break;
1316
            }
1317
        } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1318
            codec_id = CODEC_ID_PCM_F64LE;
1319
        } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1320
            int profile = matroska_aac_profile(track->codec_id);
1321
            int sri = matroska_aac_sri(track->audio.samplerate);
1322
            extradata = av_malloc(5);
1323
            if (extradata == NULL)
1324
                return AVERROR(ENOMEM);
1325
            extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1326
            extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1327
            if (strstr(track->codec_id, "SBR")) {
1328
                sri = matroska_aac_sri(track->audio.out_samplerate);
1329
                extradata[2] = 0x56;
1330
                extradata[3] = 0xE5;
1331
                extradata[4] = 0x80 | (sri<<3);
1332
                extradata_size = 5;
1333
            } else
1334
                extradata_size = 2;
1335
        } else if (codec_id == CODEC_ID_TTA) {
1336
            extradata_size = 30;
1337
            extradata = av_mallocz(extradata_size);
1338
            if (extradata == NULL)
1339
                return AVERROR(ENOMEM);
1340
            init_put_byte(&b, extradata, extradata_size, 1,
1341
                          NULL, NULL, NULL, NULL);
1342
            put_buffer(&b, "TTA1", 4);
1343
            put_le16(&b, 1);
1344
            put_le16(&b, track->audio.channels);
1345
            put_le16(&b, track->audio.bitdepth);
1346
            put_le32(&b, track->audio.out_samplerate);
1347
            put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1348
        } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1349
                   codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1350
            extradata_offset = 26;
1351
        } else if (codec_id == CODEC_ID_RA_144) {
1352
            track->audio.out_samplerate = 8000;
1353
            track->audio.channels = 1;
1354
        } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1355
                   codec_id == CODEC_ID_ATRAC3 || codec_id == CODEC_ID_SIPR) {
1356
            int flavor;
1357
            init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1358
                          0, NULL, NULL, NULL, NULL);
1359
            url_fskip(&b, 22);
1360
            flavor                       = get_be16(&b);
1361
            track->audio.coded_framesize = get_be32(&b);
1362
            url_fskip(&b, 12);
1363
            track->audio.sub_packet_h    = get_be16(&b);
1364
            track->audio.frame_size      = get_be16(&b);
1365
            track->audio.sub_packet_size = get_be16(&b);
1366
            track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1367
            if (codec_id == CODEC_ID_RA_288) {
1368
                st->codec->block_align = track->audio.coded_framesize;
1369
                track->codec_priv.size = 0;
1370
            } else {
1371
                if (codec_id == CODEC_ID_SIPR && flavor < 4) {
1372
                    const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
1373
                    track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
1374
                    st->codec->bit_rate = sipr_bit_rate[flavor];
1375
                }
1376
                st->codec->block_align = track->audio.sub_packet_size;
1377
                extradata_offset = 78;
1378
            }
1379
        }
1380
        track->codec_priv.size -= extradata_offset;
1381

    
1382
        if (codec_id == CODEC_ID_NONE)
1383
            av_log(matroska->ctx, AV_LOG_INFO,
1384
                   "Unknown/unsupported CodecID %s.\n", track->codec_id);
1385

    
1386
        if (track->time_scale < 0.01)
1387
            track->time_scale = 1.0;
1388
        av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1389

    
1390
        st->codec->codec_id = codec_id;
1391
        st->start_time = 0;
1392
        if (strcmp(track->language, "und"))
1393
            av_metadata_set2(&st->metadata, "language", track->language, 0);
1394
        av_metadata_set2(&st->metadata, "title", track->name, 0);
1395

    
1396
        if (track->flag_default)
1397
            st->disposition |= AV_DISPOSITION_DEFAULT;
1398
        if (track->flag_forced)
1399
            st->disposition |= AV_DISPOSITION_FORCED;
1400

    
1401
        if (track->default_duration)
1402
            av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1403
                      track->default_duration, 1000000000, 30000);
1404

    
1405
        if (!st->codec->extradata) {
1406
            if(extradata){
1407
                st->codec->extradata = extradata;
1408
                st->codec->extradata_size = extradata_size;
1409
            } else if(track->codec_priv.data && track->codec_priv.size > 0){
1410
                st->codec->extradata = av_mallocz(track->codec_priv.size +
1411
                                                  FF_INPUT_BUFFER_PADDING_SIZE);
1412
                if(st->codec->extradata == NULL)
1413
                    return AVERROR(ENOMEM);
1414
                st->codec->extradata_size = track->codec_priv.size;
1415
                memcpy(st->codec->extradata,
1416
                       track->codec_priv.data + extradata_offset,
1417
                       track->codec_priv.size);
1418
            }
1419
        }
1420

    
1421
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1422
            st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1423
            st->codec->codec_tag  = track->video.fourcc;
1424
            st->codec->width  = track->video.pixel_width;
1425
            st->codec->height = track->video.pixel_height;
1426
            av_reduce(&st->sample_aspect_ratio.num,
1427
                      &st->sample_aspect_ratio.den,
1428
                      st->codec->height * track->video.display_width,
1429
                      st->codec-> width * track->video.display_height,
1430
                      255);
1431
            if (st->codec->codec_id != CODEC_ID_H264)
1432
            st->need_parsing = AVSTREAM_PARSE_HEADERS;
1433
            if (track->default_duration)
1434
                st->avg_frame_rate = av_d2q(1000000000.0/track->default_duration, INT_MAX);
1435
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1436
            st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1437
            st->codec->sample_rate = track->audio.out_samplerate;
1438
            st->codec->channels = track->audio.channels;
1439
            if (st->codec->codec_id != CODEC_ID_AAC)
1440
            st->need_parsing = AVSTREAM_PARSE_HEADERS;
1441
        } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1442
            st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1443
        }
1444
    }
1445

    
1446
    attachements = attachements_list->elem;
1447
    for (j=0; j<attachements_list->nb_elem; j++) {
1448
        if (!(attachements[j].filename && attachements[j].mime &&
1449
              attachements[j].bin.data && attachements[j].bin.size > 0)) {
1450
            av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1451
        } else {
1452
            AVStream *st = av_new_stream(s, 0);
1453
            if (st == NULL)
1454
                break;
1455
            av_metadata_set2(&st->metadata, "filename",attachements[j].filename, 0);
1456
            st->codec->codec_id = CODEC_ID_NONE;
1457
            st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
1458
            st->codec->extradata  = av_malloc(attachements[j].bin.size);
1459
            if(st->codec->extradata == NULL)
1460
                break;
1461
            st->codec->extradata_size = attachements[j].bin.size;
1462
            memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1463

    
1464
            for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1465
                if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1466
                             strlen(ff_mkv_mime_tags[i].str))) {
1467
                    st->codec->codec_id = ff_mkv_mime_tags[i].id;
1468
                    break;
1469
                }
1470
            }
1471
            attachements[j].stream = st;
1472
        }
1473
    }
1474

    
1475
    chapters = chapters_list->elem;
1476
    for (i=0; i<chapters_list->nb_elem; i++)
1477
        if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
1478
            && (max_start==0 || chapters[i].start > max_start)) {
1479
            chapters[i].chapter =
1480
            ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1481
                           chapters[i].start, chapters[i].end,
1482
                           chapters[i].title);
1483
            av_metadata_set2(&chapters[i].chapter->metadata,
1484
                             "title", chapters[i].title, 0);
1485
            max_start = chapters[i].start;
1486
        }
1487

    
1488
    index_list = &matroska->index;
1489
    index = index_list->elem;
1490
    if (index_list->nb_elem
1491
        && index[0].time > 100000000000000/matroska->time_scale) {
1492
        av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1493
        index_scale = matroska->time_scale;
1494
    }
1495
    for (i=0; i<index_list->nb_elem; i++) {
1496
        EbmlList *pos_list = &index[i].pos;
1497
        MatroskaIndexPos *pos = pos_list->elem;
1498
        for (j=0; j<pos_list->nb_elem; j++) {
1499
            MatroskaTrack *track = matroska_find_track_by_num(matroska,
1500
                                                              pos[j].track);
1501
            if (track && track->stream)
1502
                av_add_index_entry(track->stream,
1503
                                   pos[j].pos + matroska->segment_start,
1504
                                   index[i].time/index_scale, 0, 0,
1505
                                   AVINDEX_KEYFRAME);
1506
        }
1507
    }
1508

    
1509
    matroska_convert_tags(s);
1510

    
1511
    return 0;
1512
}
1513

    
1514
/*
1515
 * Put one packet in an application-supplied AVPacket struct.
1516
 * Returns 0 on success or -1 on failure.
1517
 */
1518
static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1519
                                   AVPacket *pkt)
1520
{
1521
    if (matroska->num_packets > 0) {
1522
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1523
        av_free(matroska->packets[0]);
1524
        if (matroska->num_packets > 1) {
1525
            memmove(&matroska->packets[0], &matroska->packets[1],
1526
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
1527
            matroska->packets =
1528
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
1529
                           sizeof(AVPacket *));
1530
        } else {
1531
            av_freep(&matroska->packets);
1532
        }
1533
        matroska->num_packets--;
1534
        return 0;
1535
    }
1536

    
1537
    return -1;
1538
}
1539

    
1540
/*
1541
 * Free all packets in our internal queue.
1542
 */
1543
static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1544
{
1545
    if (matroska->packets) {
1546
        int n;
1547
        for (n = 0; n < matroska->num_packets; n++) {
1548
            av_free_packet(matroska->packets[n]);
1549
            av_free(matroska->packets[n]);
1550
        }
1551
        av_freep(&matroska->packets);
1552
        matroska->num_packets = 0;
1553
    }
1554
}
1555

    
1556
static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1557
                                int size, int64_t pos, uint64_t cluster_time,
1558
                                uint64_t duration, int is_keyframe,
1559
                                int64_t cluster_pos)
1560
{
1561
    uint64_t timecode = AV_NOPTS_VALUE;
1562
    MatroskaTrack *track;
1563
    int res = 0;
1564
    AVStream *st;
1565
    AVPacket *pkt;
1566
    int16_t block_time;
1567
    uint32_t *lace_size = NULL;
1568
    int n, flags, laces = 0;
1569
    uint64_t num;
1570

    
1571
    if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1572
        av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1573
        return res;
1574
    }
1575
    data += n;
1576
    size -= n;
1577

    
1578
    track = matroska_find_track_by_num(matroska, num);
1579
    if (size <= 3 || !track || !track->stream) {
1580
        av_log(matroska->ctx, AV_LOG_INFO,
1581
               "Invalid stream %"PRIu64" or size %u\n", num, size);
1582
        return res;
1583
    }
1584
    st = track->stream;
1585
    if (st->discard >= AVDISCARD_ALL)
1586
        return res;
1587
    if (duration == AV_NOPTS_VALUE)
1588
        duration = track->default_duration / matroska->time_scale;
1589

    
1590
    block_time = AV_RB16(data);
1591
    data += 2;
1592
    flags = *data++;
1593
    size -= 3;
1594
    if (is_keyframe == -1)
1595
        is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
1596

    
1597
    if (cluster_time != (uint64_t)-1
1598
        && (block_time >= 0 || cluster_time >= -block_time)) {
1599
        timecode = cluster_time + block_time;
1600
        if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
1601
            && timecode < track->end_timecode)
1602
            is_keyframe = 0;  /* overlapping subtitles are not key frame */
1603
        if (is_keyframe)
1604
            av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
1605
        track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
1606
    }
1607

    
1608
    if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1609
        if (!is_keyframe || timecode < matroska->skip_to_timecode)
1610
            return res;
1611
        matroska->skip_to_keyframe = 0;
1612
    }
1613

    
1614
    switch ((flags & 0x06) >> 1) {
1615
        case 0x0: /* no lacing */
1616
            laces = 1;
1617
            lace_size = av_mallocz(sizeof(int));
1618
            lace_size[0] = size;
1619
            break;
1620

    
1621
        case 0x1: /* Xiph lacing */
1622
        case 0x2: /* fixed-size lacing */
1623
        case 0x3: /* EBML lacing */
1624
            assert(size>0); // size <=3 is checked before size-=3 above
1625
            laces = (*data) + 1;
1626
            data += 1;
1627
            size -= 1;
1628
            lace_size = av_mallocz(laces * sizeof(int));
1629

    
1630
            switch ((flags & 0x06) >> 1) {
1631
                case 0x1: /* Xiph lacing */ {
1632
                    uint8_t temp;
1633
                    uint32_t total = 0;
1634
                    for (n = 0; res == 0 && n < laces - 1; n++) {
1635
                        while (1) {
1636
                            if (size == 0) {
1637
                                res = -1;
1638
                                break;
1639
                            }
1640
                            temp = *data;
1641
                            lace_size[n] += temp;
1642
                            data += 1;
1643
                            size -= 1;
1644
                            if (temp != 0xff)
1645
                                break;
1646
                        }
1647
                        total += lace_size[n];
1648
                    }
1649
                    lace_size[n] = size - total;
1650
                    break;
1651
                }
1652

    
1653
                case 0x2: /* fixed-size lacing */
1654
                    for (n = 0; n < laces; n++)
1655
                        lace_size[n] = size / laces;
1656
                    break;
1657

    
1658
                case 0x3: /* EBML lacing */ {
1659
                    uint32_t total;
1660
                    n = matroska_ebmlnum_uint(matroska, data, size, &num);
1661
                    if (n < 0) {
1662
                        av_log(matroska->ctx, AV_LOG_INFO,
1663
                               "EBML block data error\n");
1664
                        break;
1665
                    }
1666
                    data += n;
1667
                    size -= n;
1668
                    total = lace_size[0] = num;
1669
                    for (n = 1; res == 0 && n < laces - 1; n++) {
1670
                        int64_t snum;
1671
                        int r;
1672
                        r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1673
                        if (r < 0) {
1674
                            av_log(matroska->ctx, AV_LOG_INFO,
1675
                                   "EBML block data error\n");
1676
                            break;
1677
                        }
1678
                        data += r;
1679
                        size -= r;
1680
                        lace_size[n] = lace_size[n - 1] + snum;
1681
                        total += lace_size[n];
1682
                    }
1683
                    lace_size[n] = size - total;
1684
                    break;
1685
                }
1686
            }
1687
            break;
1688
    }
1689

    
1690
    if (res == 0) {
1691
        for (n = 0; n < laces; n++) {
1692
            if ((st->codec->codec_id == CODEC_ID_RA_288 ||
1693
                 st->codec->codec_id == CODEC_ID_COOK ||
1694
                 st->codec->codec_id == CODEC_ID_SIPR ||
1695
                 st->codec->codec_id == CODEC_ID_ATRAC3) &&
1696
                 st->codec->block_align && track->audio.sub_packet_size) {
1697
                int a = st->codec->block_align;
1698
                int sps = track->audio.sub_packet_size;
1699
                int cfs = track->audio.coded_framesize;
1700
                int h = track->audio.sub_packet_h;
1701
                int y = track->audio.sub_packet_cnt;
1702
                int w = track->audio.frame_size;
1703
                int x;
1704

    
1705
                if (!track->audio.pkt_cnt) {
1706
                    if (st->codec->codec_id == CODEC_ID_RA_288)
1707
                        for (x=0; x<h/2; x++)
1708
                            memcpy(track->audio.buf+x*2*w+y*cfs,
1709
                                   data+x*cfs, cfs);
1710
                    else if (st->codec->codec_id == CODEC_ID_SIPR)
1711
                        memcpy(track->audio.buf + y*w, data, w);
1712
                    else
1713
                        for (x=0; x<w/sps; x++)
1714
                            memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1715

    
1716
                    if (++track->audio.sub_packet_cnt >= h) {
1717
                        if (st->codec->codec_id == CODEC_ID_SIPR)
1718
                            ff_rm_reorder_sipr_data(track->audio.buf, h, w);
1719
                        track->audio.sub_packet_cnt = 0;
1720
                        track->audio.pkt_cnt = h*w / a;
1721
                    }
1722
                }
1723
                while (track->audio.pkt_cnt) {
1724
                    pkt = av_mallocz(sizeof(AVPacket));
1725
                    av_new_packet(pkt, a);
1726
                    memcpy(pkt->data, track->audio.buf
1727
                           + a * (h*w / a - track->audio.pkt_cnt--), a);
1728
                    pkt->pos = pos;
1729
                    pkt->stream_index = st->index;
1730
                    dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1731
                }
1732
            } else {
1733
                MatroskaTrackEncoding *encodings = track->encodings.elem;
1734
                int offset = 0, pkt_size = lace_size[n];
1735
                uint8_t *pkt_data = data;
1736

    
1737
                if (pkt_size > size) {
1738
                    av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
1739
                    break;
1740
                }
1741

    
1742
                if (encodings && encodings->scope & 1) {
1743
                    offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1744
                    if (offset < 0)
1745
                        continue;
1746
                }
1747

    
1748
                pkt = av_mallocz(sizeof(AVPacket));
1749
                /* XXX: prevent data copy... */
1750
                if (av_new_packet(pkt, pkt_size+offset) < 0) {
1751
                    av_free(pkt);
1752
                    res = AVERROR(ENOMEM);
1753
                    break;
1754
                }
1755
                if (offset)
1756
                    memcpy (pkt->data, encodings->compression.settings.data, offset);
1757
                memcpy (pkt->data+offset, pkt_data, pkt_size);
1758

    
1759
                if (pkt_data != data)
1760
                    av_free(pkt_data);
1761

    
1762
                if (n == 0)
1763
                    pkt->flags = is_keyframe;
1764
                pkt->stream_index = st->index;
1765

    
1766
                if (track->ms_compat)
1767
                    pkt->dts = timecode;
1768
                else
1769
                    pkt->pts = timecode;
1770
                pkt->pos = pos;
1771
                if (st->codec->codec_id == CODEC_ID_TEXT)
1772
                    pkt->convergence_duration = duration;
1773
                else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1774
                    pkt->duration = duration;
1775

    
1776
                if (st->codec->codec_id == CODEC_ID_SSA)
1777
                    matroska_fix_ass_packet(matroska, pkt, duration);
1778

    
1779
                if (matroska->prev_pkt &&
1780
                    timecode != AV_NOPTS_VALUE &&
1781
                    matroska->prev_pkt->pts == timecode &&
1782
                    matroska->prev_pkt->stream_index == st->index &&
1783
                    st->codec->codec_id == CODEC_ID_SSA)
1784
                    matroska_merge_packets(matroska->prev_pkt, pkt);
1785
                else {
1786
                    dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1787
                    matroska->prev_pkt = pkt;
1788
                }
1789
            }
1790

    
1791
            if (timecode != AV_NOPTS_VALUE)
1792
                timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1793
            data += lace_size[n];
1794
            size -= lace_size[n];
1795
        }
1796
    }
1797

    
1798
    av_free(lace_size);
1799
    return res;
1800
}
1801

    
1802
static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1803
{
1804
    MatroskaCluster cluster = { 0 };
1805
    EbmlList *blocks_list;
1806
    MatroskaBlock *blocks;
1807
    int i, res;
1808
    int64_t pos = url_ftell(matroska->ctx->pb);
1809
    matroska->prev_pkt = NULL;
1810
    if (matroska->current_id)
1811
        pos -= 4;  /* sizeof the ID which was already read */
1812
    res = ebml_parse(matroska, matroska_clusters, &cluster);
1813
    blocks_list = &cluster.blocks;
1814
    blocks = blocks_list->elem;
1815
    for (i=0; i<blocks_list->nb_elem; i++)
1816
        if (blocks[i].bin.size > 0 && blocks[i].bin.data) {
1817
            int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
1818
            res=matroska_parse_block(matroska,
1819
                                     blocks[i].bin.data, blocks[i].bin.size,
1820
                                     blocks[i].bin.pos,  cluster.timecode,
1821
                                     blocks[i].duration, is_keyframe,
1822
                                     pos);
1823
        }
1824
    ebml_free(matroska_cluster, &cluster);
1825
    if (res < 0)  matroska->done = 1;
1826
    return res;
1827
}
1828

    
1829
static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1830
{
1831
    MatroskaDemuxContext *matroska = s->priv_data;
1832

    
1833
    while (matroska_deliver_packet(matroska, pkt)) {
1834
        if (matroska->done)
1835
            return AVERROR_EOF;
1836
        matroska_parse_cluster(matroska);
1837
    }
1838

    
1839
    return 0;
1840
}
1841

    
1842
static int matroska_read_seek(AVFormatContext *s, int stream_index,
1843
                              int64_t timestamp, int flags)
1844
{
1845
    MatroskaDemuxContext *matroska = s->priv_data;
1846
    MatroskaTrack *tracks = matroska->tracks.elem;
1847
    AVStream *st = s->streams[stream_index];
1848
    int i, index, index_sub, index_min;
1849

    
1850
    if (!st->nb_index_entries)
1851
        return 0;
1852
    timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
1853

    
1854
    if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1855
        url_fseek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
1856
        while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1857
            matroska_clear_queue(matroska);
1858
            if (matroska_parse_cluster(matroska) < 0)
1859
                break;
1860
        }
1861
    }
1862

    
1863
    matroska_clear_queue(matroska);
1864
    if (index < 0)
1865
        return 0;
1866

    
1867
    index_min = index;
1868
    for (i=0; i < matroska->tracks.nb_elem; i++) {
1869
        tracks[i].end_timecode = 0;
1870
        if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
1871
            && !tracks[i].stream->discard != AVDISCARD_ALL) {
1872
            index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
1873
            if (index_sub >= 0
1874
                && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
1875
                && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
1876
                index_min = index_sub;
1877
        }
1878
    }
1879

    
1880
    url_fseek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
1881
    matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1882
    matroska->skip_to_timecode = st->index_entries[index].timestamp;
1883
    matroska->done = 0;
1884
    av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1885
    return 0;
1886
}
1887

    
1888
static int matroska_read_close(AVFormatContext *s)
1889
{
1890
    MatroskaDemuxContext *matroska = s->priv_data;
1891
    MatroskaTrack *tracks = matroska->tracks.elem;
1892
    int n;
1893

    
1894
    matroska_clear_queue(matroska);
1895

    
1896
    for (n=0; n < matroska->tracks.nb_elem; n++)
1897
        if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1898
            av_free(tracks[n].audio.buf);
1899
    ebml_free(matroska_segment, matroska);
1900

    
1901
    return 0;
1902
}
1903

    
1904
AVInputFormat matroska_demuxer = {
1905
    "matroska,webm",
1906
    NULL_IF_CONFIG_SMALL("Matroska/WebM file format"),
1907
    sizeof(MatroskaDemuxContext),
1908
    matroska_probe,
1909
    matroska_read_header,
1910
    matroska_read_packet,
1911
    matroska_read_close,
1912
    matroska_read_seek,
1913
    .metadata_conv = ff_mkv_metadata_conv,
1914
};