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ffmpeg / libavformat / matroskadec.c @ 9a2cb05f

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/*
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 * Matroska file demuxer
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 * Copyright (c) 2003-2008 The FFmpeg Project
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file libavformat/matroskadec.c
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 * Matroska file demuxer
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 * by Ronald Bultje <rbultje@ronald.bitfreak.net>
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 * with a little help from Moritz Bunkus <moritz@bunkus.org>
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 * totally reworked by Aurelien Jacobs <aurel@gnuage.org>
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 * Specs available on the Matroska project page: http://www.matroska.org/.
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 */
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#include <stdio.h>
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#include "avformat.h"
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#include "internal.h"
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/* For ff_codec_get_id(). */
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#include "riff.h"
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#include "isom.h"
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#include "rm.h"
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#include "matroska.h"
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#include "libavcodec/mpeg4audio.h"
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#include "libavutil/intfloat_readwrite.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/avstring.h"
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#include "libavutil/lzo.h"
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#if CONFIG_ZLIB
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#include <zlib.h>
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#endif
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#if CONFIG_BZLIB
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#include <bzlib.h>
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#endif
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typedef enum {
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    EBML_NONE,
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    EBML_UINT,
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    EBML_FLOAT,
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    EBML_STR,
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    EBML_UTF8,
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    EBML_BIN,
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    EBML_NEST,
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    EBML_PASS,
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    EBML_STOP,
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} EbmlType;
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typedef const struct EbmlSyntax {
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    uint32_t id;
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    EbmlType type;
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    int list_elem_size;
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    int data_offset;
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    union {
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        uint64_t    u;
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        double      f;
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        const char *s;
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        const struct EbmlSyntax *n;
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    } def;
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} EbmlSyntax;
75

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

    
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typedef struct {
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    int      size;
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    uint8_t *data;
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    int64_t  pos;
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} EbmlBin;
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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;
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typedef struct {
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    uint64_t num;
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    uint64_t uid;
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    uint64_t type;
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    char    *name;
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    char    *codec_id;
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    EbmlBin  codec_priv;
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    char    *language;
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    double time_scale;
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    uint64_t default_duration;
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    uint64_t flag_default;
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    MatroskaTrackVideo video;
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    MatroskaTrackAudio audio;
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    EbmlList encodings;
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    AVStream *stream;
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    int64_t end_timecode;
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    int ms_compat;
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} MatroskaTrack;
150

    
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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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    uint64_t time_scale;
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    double   duration;
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    char    *title;
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    EbmlList tracks;
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    EbmlList attachments;
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    EbmlList chapters;
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    EbmlList index;
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    EbmlList tags;
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    EbmlList seekhead;
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    /* byte position of the segment inside the stream */
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    int64_t segment_start;
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    /* the packet queue */
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    AVPacket **packets;
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    int num_packets;
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    AVPacket *prev_pkt;
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    int done;
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    int has_cluster_id;
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    /* What to skip before effectively reading a packet. */
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    int skip_to_keyframe;
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    uint64_t skip_to_timecode;
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} MatroskaDemuxContext;
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typedef struct {
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    uint64_t duration;
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    int64_t  reference;
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    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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};
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static EbmlSyntax matroska_track_video[] = {
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    { MATROSKA_ID_VIDEOFRAMERATE,     EBML_FLOAT,0, offsetof(MatroskaTrackVideo,frame_rate) },
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    { MATROSKA_ID_VIDEODISPLAYWIDTH,  EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_width) },
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    { MATROSKA_ID_VIDEODISPLAYHEIGHT, EBML_UINT, 0, offsetof(MatroskaTrackVideo,display_height) },
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    { MATROSKA_ID_VIDEOPIXELWIDTH,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_width) },
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    { MATROSKA_ID_VIDEOPIXELHEIGHT,   EBML_UINT, 0, offsetof(MatroskaTrackVideo,pixel_height) },
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    { MATROSKA_ID_VIDEOCOLORSPACE,    EBML_UINT, 0, offsetof(MatroskaTrackVideo,fourcc) },
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    { MATROSKA_ID_VIDEOPIXELCROPB,    EBML_NONE },
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    { MATROSKA_ID_VIDEOPIXELCROPT,    EBML_NONE },
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    { MATROSKA_ID_VIDEOPIXELCROPL,    EBML_NONE },
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    { MATROSKA_ID_VIDEOPIXELCROPR,    EBML_NONE },
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    { MATROSKA_ID_VIDEODISPLAYUNIT,   EBML_NONE },
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    { MATROSKA_ID_VIDEOFLAGINTERLACED,EBML_NONE },
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    { MATROSKA_ID_VIDEOSTEREOMODE,    EBML_NONE },
297
    { MATROSKA_ID_VIDEOASPECTRATIO,   EBML_NONE },
298
    { 0 }
299
};
300

    
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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) },
305
    { MATROSKA_ID_AUDIOCHANNELS,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
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    { 0 }
307
};
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static EbmlSyntax matroska_track_encoding_compression[] = {
310
    { MATROSKA_ID_ENCODINGCOMPALGO,   EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
311
    { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
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    { 0 }
313
};
314

    
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static EbmlSyntax matroska_track_encoding[] = {
316
    { MATROSKA_ID_ENCODINGSCOPE,      EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
317
    { MATROSKA_ID_ENCODINGTYPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
318
    { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
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    { MATROSKA_ID_ENCODINGORDER,      EBML_NONE },
320
    { 0 }
321
};
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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 }
326
};
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static EbmlSyntax matroska_track[] = {
329
    { MATROSKA_ID_TRACKNUMBER,          EBML_UINT, 0, offsetof(MatroskaTrack,num) },
330
    { MATROSKA_ID_TRACKNAME,            EBML_UTF8, 0, offsetof(MatroskaTrack,name) },
331
    { MATROSKA_ID_TRACKUID,             EBML_UINT, 0, offsetof(MatroskaTrack,uid) },
332
    { MATROSKA_ID_TRACKTYPE,            EBML_UINT, 0, offsetof(MatroskaTrack,type) },
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    { MATROSKA_ID_CODECID,              EBML_STR,  0, offsetof(MatroskaTrack,codec_id) },
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    { 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"} },
336
    { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
337
    { MATROSKA_ID_TRACKTIMECODESCALE,   EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
338
    { MATROSKA_ID_TRACKFLAGDEFAULT,     EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
339
    { MATROSKA_ID_TRACKVIDEO,           EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
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    { MATROSKA_ID_TRACKAUDIO,           EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
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    { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
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    { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
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    { MATROSKA_ID_TRACKFLAGFORCED,      EBML_NONE },
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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 }
353
};
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 }
358
};
359

    
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static EbmlSyntax matroska_attachment[] = {
361
    { MATROSKA_ID_FILEUID,            EBML_UINT, 0, offsetof(MatroskaAttachement,uid) },
362
    { 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) },
365
    { MATROSKA_ID_FILEDESC,           EBML_NONE },
366
    { 0 }
367
};
368

    
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static EbmlSyntax matroska_attachments[] = {
370
    { MATROSKA_ID_ATTACHEDFILE,       EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
371
    { 0 }
372
};
373

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

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

    
392
static EbmlSyntax matroska_chapter[] = {
393
    { MATROSKA_ID_CHAPTERATOM,        EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
394
    { MATROSKA_ID_EDITIONUID,         EBML_NONE },
395
    { MATROSKA_ID_EDITIONFLAGHIDDEN,  EBML_NONE },
396
    { MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
397
    { MATROSKA_ID_EDITIONFLAGORDERED, EBML_NONE },
398
    { 0 }
399
};
400

    
401
static EbmlSyntax matroska_chapters[] = {
402
    { MATROSKA_ID_EDITIONENTRY,       EBML_NEST, 0, 0, {.n=matroska_chapter} },
403
    { 0 }
404
};
405

    
406
static EbmlSyntax matroska_index_pos[] = {
407
    { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
408
    { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos)   },
409
    { MATROSKA_ID_CUEBLOCKNUMBER,     EBML_NONE },
410
    { 0 }
411
};
412

    
413
static EbmlSyntax matroska_index_entry[] = {
414
    { MATROSKA_ID_CUETIME,            EBML_UINT, 0, offsetof(MatroskaIndex,time) },
415
    { MATROSKA_ID_CUETRACKPOSITION,   EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
416
    { 0 }
417
};
418

    
419
static EbmlSyntax matroska_index[] = {
420
    { MATROSKA_ID_POINTENTRY,         EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
421
    { 0 }
422
};
423

    
424
static EbmlSyntax matroska_simpletag[] = {
425
    { MATROSKA_ID_TAGNAME,            EBML_UTF8, 0, offsetof(MatroskaTag,name) },
426
    { MATROSKA_ID_TAGSTRING,          EBML_UTF8, 0, offsetof(MatroskaTag,string) },
427
    { MATROSKA_ID_TAGLANG,            EBML_STR,  0, offsetof(MatroskaTag,lang), {.s="und"} },
428
    { MATROSKA_ID_TAGDEFAULT,         EBML_UINT, 0, offsetof(MatroskaTag,def) },
429
    { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
430
    { 0 }
431
};
432

    
433
static EbmlSyntax matroska_tagtargets[] = {
434
    { MATROSKA_ID_TAGTARGETS_TYPE,      EBML_STR,  0, offsetof(MatroskaTagTarget,type) },
435
    { MATROSKA_ID_TAGTARGETS_TYPEVALUE, EBML_UINT, 0, offsetof(MatroskaTagTarget,typevalue), {.u=50} },
436
    { MATROSKA_ID_TAGTARGETS_TRACKUID,  EBML_UINT, 0, offsetof(MatroskaTagTarget,trackuid) },
437
    { MATROSKA_ID_TAGTARGETS_CHAPTERUID,EBML_UINT, 0, offsetof(MatroskaTagTarget,chapteruid) },
438
    { MATROSKA_ID_TAGTARGETS_ATTACHUID, EBML_UINT, 0, offsetof(MatroskaTagTarget,attachuid) },
439
    { 0 }
440
};
441

    
442
static EbmlSyntax matroska_tag[] = {
443
    { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTags,tag), {.n=matroska_simpletag} },
444
    { MATROSKA_ID_TAGTARGETS,         EBML_NEST, 0, offsetof(MatroskaTags,target), {.n=matroska_tagtargets} },
445
    { 0 }
446
};
447

    
448
static EbmlSyntax matroska_tags[] = {
449
    { MATROSKA_ID_TAG,                EBML_NEST, sizeof(MatroskaTags), offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
450
    { 0 }
451
};
452

    
453
static EbmlSyntax matroska_seekhead_entry[] = {
454
    { MATROSKA_ID_SEEKID,             EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
455
    { MATROSKA_ID_SEEKPOSITION,       EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
456
    { 0 }
457
};
458

    
459
static EbmlSyntax matroska_seekhead[] = {
460
    { MATROSKA_ID_SEEKENTRY,          EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
461
    { 0 }
462
};
463

    
464
static EbmlSyntax matroska_segment[] = {
465
    { MATROSKA_ID_INFO,           EBML_NEST, 0, 0, {.n=matroska_info       } },
466
    { MATROSKA_ID_TRACKS,         EBML_NEST, 0, 0, {.n=matroska_tracks     } },
467
    { MATROSKA_ID_ATTACHMENTS,    EBML_NEST, 0, 0, {.n=matroska_attachments} },
468
    { MATROSKA_ID_CHAPTERS,       EBML_NEST, 0, 0, {.n=matroska_chapters   } },
469
    { MATROSKA_ID_CUES,           EBML_NEST, 0, 0, {.n=matroska_index      } },
470
    { MATROSKA_ID_TAGS,           EBML_NEST, 0, 0, {.n=matroska_tags       } },
471
    { MATROSKA_ID_SEEKHEAD,       EBML_NEST, 0, 0, {.n=matroska_seekhead   } },
472
    { MATROSKA_ID_CLUSTER,        EBML_STOP, 0, offsetof(MatroskaDemuxContext,has_cluster_id) },
473
    { 0 }
474
};
475

    
476
static EbmlSyntax matroska_segments[] = {
477
    { MATROSKA_ID_SEGMENT,        EBML_NEST, 0, 0, {.n=matroska_segment    } },
478
    { 0 }
479
};
480

    
481
static EbmlSyntax matroska_blockgroup[] = {
482
    { MATROSKA_ID_BLOCK,          EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
483
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
484
    { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
485
    { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
486
    { 1,                          EBML_UINT, 0, offsetof(MatroskaBlock,non_simple), {.u=1} },
487
    { 0 }
488
};
489

    
490
static EbmlSyntax matroska_cluster[] = {
491
    { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
492
    { MATROSKA_ID_BLOCKGROUP,     EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
493
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
494
    { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
495
    { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
496
    { 0 }
497
};
498

    
499
static EbmlSyntax matroska_clusters[] = {
500
    { MATROSKA_ID_CLUSTER,        EBML_NEST, 0, 0, {.n=matroska_cluster} },
501
    { MATROSKA_ID_INFO,           EBML_NONE },
502
    { MATROSKA_ID_CUES,           EBML_NONE },
503
    { MATROSKA_ID_TAGS,           EBML_NONE },
504
    { MATROSKA_ID_SEEKHEAD,       EBML_NONE },
505
    { 0 }
506
};
507

    
508
/*
509
 * Return: Whether we reached the end of a level in the hierarchy or not.
510
 */
511
static int ebml_level_end(MatroskaDemuxContext *matroska)
512
{
513
    ByteIOContext *pb = matroska->ctx->pb;
514
    int64_t pos = url_ftell(pb);
515

    
516
    if (matroska->num_levels > 0) {
517
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
518
        if (pos - level->start >= level->length) {
519
            matroska->num_levels--;
520
            return 1;
521
        }
522
    }
523
    return 0;
524
}
525

    
526
/*
527
 * Read: an "EBML number", which is defined as a variable-length
528
 * array of bytes. The first byte indicates the length by giving a
529
 * number of 0-bits followed by a one. The position of the first
530
 * "one" bit inside the first byte indicates the length of this
531
 * number.
532
 * Returns: number of bytes read, < 0 on error
533
 */
534
static int ebml_read_num(MatroskaDemuxContext *matroska, ByteIOContext *pb,
535
                         int max_size, uint64_t *number)
536
{
537
    int len_mask = 0x80, read = 1, n = 1;
538
    int64_t total = 0;
539

    
540
    /* The first byte tells us the length in bytes - get_byte() can normally
541
     * return 0, but since that's not a valid first ebmlID byte, we can
542
     * use it safely here to catch EOS. */
543
    if (!(total = get_byte(pb))) {
544
        /* we might encounter EOS here */
545
        if (!url_feof(pb)) {
546
            int64_t pos = url_ftell(pb);
547
            av_log(matroska->ctx, AV_LOG_ERROR,
548
                   "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
549
                   pos, pos);
550
        }
551
        return AVERROR(EIO); /* EOS or actual I/O error */
552
    }
553

    
554
    /* get the length of the EBML number */
555
    while (read <= max_size && !(total & len_mask)) {
556
        read++;
557
        len_mask >>= 1;
558
    }
559
    if (read > max_size) {
560
        int64_t pos = url_ftell(pb) - 1;
561
        av_log(matroska->ctx, AV_LOG_ERROR,
562
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
563
               (uint8_t) total, pos, pos);
564
        return AVERROR_INVALIDDATA;
565
    }
566

    
567
    /* read out length */
568
    total &= ~len_mask;
569
    while (n++ < read)
570
        total = (total << 8) | get_byte(pb);
571

    
572
    *number = total;
573

    
574
    return read;
575
}
576

    
577
/*
578
 * Read the next element as an unsigned int.
579
 * 0 is success, < 0 is failure.
580
 */
581
static int ebml_read_uint(ByteIOContext *pb, int size, uint64_t *num)
582
{
583
    int n = 0;
584

    
585
    if (size < 1 || size > 8)
586
        return AVERROR_INVALIDDATA;
587

    
588
    /* big-endian ordering; build up number */
589
    *num = 0;
590
    while (n++ < size)
591
        *num = (*num << 8) | get_byte(pb);
592

    
593
    return 0;
594
}
595

    
596
/*
597
 * Read the next element as a float.
598
 * 0 is success, < 0 is failure.
599
 */
600
static int ebml_read_float(ByteIOContext *pb, int size, double *num)
601
{
602
    if (size == 4) {
603
        *num= av_int2flt(get_be32(pb));
604
    } else if(size==8){
605
        *num= av_int2dbl(get_be64(pb));
606
    } else
607
        return AVERROR_INVALIDDATA;
608

    
609
    return 0;
610
}
611

    
612
/*
613
 * Read the next element as an ASCII string.
614
 * 0 is success, < 0 is failure.
615
 */
616
static int ebml_read_ascii(ByteIOContext *pb, int size, char **str)
617
{
618
    av_free(*str);
619
    /* EBML strings are usually not 0-terminated, so we allocate one
620
     * byte more, read the string and NULL-terminate it ourselves. */
621
    if (!(*str = av_malloc(size + 1)))
622
        return AVERROR(ENOMEM);
623
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
624
        av_free(*str);
625
        return AVERROR(EIO);
626
    }
627
    (*str)[size] = '\0';
628

    
629
    return 0;
630
}
631

    
632
/*
633
 * Read the next element as binary data.
634
 * 0 is success, < 0 is failure.
635
 */
636
static int ebml_read_binary(ByteIOContext *pb, int length, EbmlBin *bin)
637
{
638
    av_free(bin->data);
639
    if (!(bin->data = av_malloc(length)))
640
        return AVERROR(ENOMEM);
641

    
642
    bin->size = length;
643
    bin->pos  = url_ftell(pb);
644
    if (get_buffer(pb, bin->data, length) != length)
645
        return AVERROR(EIO);
646

    
647
    return 0;
648
}
649

    
650
/*
651
 * Read the next element, but only the header. The contents
652
 * are supposed to be sub-elements which can be read separately.
653
 * 0 is success, < 0 is failure.
654
 */
655
static int ebml_read_master(MatroskaDemuxContext *matroska, int length)
656
{
657
    ByteIOContext *pb = matroska->ctx->pb;
658
    MatroskaLevel *level;
659

    
660
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
661
        av_log(matroska->ctx, AV_LOG_ERROR,
662
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
663
        return AVERROR(ENOSYS);
664
    }
665

    
666
    level = &matroska->levels[matroska->num_levels++];
667
    level->start = url_ftell(pb);
668
    level->length = length;
669

    
670
    return 0;
671
}
672

    
673
/*
674
 * Read signed/unsigned "EBML" numbers.
675
 * Return: number of bytes processed, < 0 on error
676
 */
677
static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
678
                                 uint8_t *data, uint32_t size, uint64_t *num)
679
{
680
    ByteIOContext pb;
681
    init_put_byte(&pb, data, size, 0, NULL, NULL, NULL, NULL);
682
    return ebml_read_num(matroska, &pb, 8, num);
683
}
684

    
685
/*
686
 * Same as above, but signed.
687
 */
688
static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
689
                                 uint8_t *data, uint32_t size, int64_t *num)
690
{
691
    uint64_t unum;
692
    int res;
693

    
694
    /* read as unsigned number first */
695
    if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
696
        return res;
697

    
698
    /* make signed (weird way) */
699
    *num = unum - ((1LL << (7*res - 1)) - 1);
700

    
701
    return res;
702
}
703

    
704
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
705
                           EbmlSyntax *syntax, void *data);
706

    
707
static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
708
                         uint32_t id, void *data)
709
{
710
    int i;
711
    for (i=0; syntax[i].id; i++)
712
        if (id == syntax[i].id)
713
            break;
714
    if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
715
        av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
716
    return ebml_parse_elem(matroska, &syntax[i], data);
717
}
718

    
719
static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
720
                      void *data)
721
{
722
    uint64_t id;
723
    int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
724
    id |= 1 << 7*res;
725
    return res < 0 ? res : ebml_parse_id(matroska, syntax, id, data);
726
}
727

    
728
static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
729
                           void *data)
730
{
731
    int i, res = 0;
732

    
733
    for (i=0; syntax[i].id; i++)
734
        switch (syntax[i].type) {
735
        case EBML_UINT:
736
            *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
737
            break;
738
        case EBML_FLOAT:
739
            *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
740
            break;
741
        case EBML_STR:
742
        case EBML_UTF8:
743
            *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
744
            break;
745
        }
746

    
747
    while (!res && !ebml_level_end(matroska))
748
        res = ebml_parse(matroska, syntax, data);
749

    
750
    return res;
751
}
752

    
753
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
754
                           EbmlSyntax *syntax, void *data)
755
{
756
    ByteIOContext *pb = matroska->ctx->pb;
757
    uint32_t id = syntax->id;
758
    uint64_t length;
759
    int res;
760

    
761
    data = (char *)data + syntax->data_offset;
762
    if (syntax->list_elem_size) {
763
        EbmlList *list = data;
764
        list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
765
        data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
766
        memset(data, 0, syntax->list_elem_size);
767
        list->nb_elem++;
768
    }
769

    
770
    if (syntax->type != EBML_PASS && syntax->type != EBML_STOP)
771
        if ((res = ebml_read_num(matroska, pb, 8, &length)) < 0)
772
            return res;
773

    
774
    switch (syntax->type) {
775
    case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
776
    case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
777
    case EBML_STR:
778
    case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
779
    case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
780
    case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
781
                         return res;
782
                     if (id == MATROSKA_ID_SEGMENT)
783
                         matroska->segment_start = url_ftell(matroska->ctx->pb);
784
                     return ebml_parse_nest(matroska, syntax->def.n, data);
785
    case EBML_PASS:  return ebml_parse_id(matroska, syntax->def.n, id, data);
786
    case EBML_STOP:  *(int *)data = 1;      return 1;
787
    default:         return url_fseek(pb,length,SEEK_CUR)<0 ? AVERROR(EIO) : 0;
788
    }
789
    if (res == AVERROR_INVALIDDATA)
790
        av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
791
    else if (res == AVERROR(EIO))
792
        av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
793
    return res;
794
}
795

    
796
static void ebml_free(EbmlSyntax *syntax, void *data)
797
{
798
    int i, j;
799
    for (i=0; syntax[i].id; i++) {
800
        void *data_off = (char *)data + syntax[i].data_offset;
801
        switch (syntax[i].type) {
802
        case EBML_STR:
803
        case EBML_UTF8:  av_freep(data_off);                      break;
804
        case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
805
        case EBML_NEST:
806
            if (syntax[i].list_elem_size) {
807
                EbmlList *list = data_off;
808
                char *ptr = list->elem;
809
                for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
810
                    ebml_free(syntax[i].def.n, ptr);
811
                av_free(list->elem);
812
            } else
813
                ebml_free(syntax[i].def.n, data_off);
814
        default:  break;
815
        }
816
    }
817
}
818

    
819

    
820
/*
821
 * Autodetecting...
822
 */
823
static int matroska_probe(AVProbeData *p)
824
{
825
    uint64_t total = 0;
826
    int len_mask = 0x80, size = 1, n = 1;
827
    static const char probe_data[] = "matroska";
828

    
829
    /* EBML header? */
830
    if (AV_RB32(p->buf) != EBML_ID_HEADER)
831
        return 0;
832

    
833
    /* length of header */
834
    total = p->buf[4];
835
    while (size <= 8 && !(total & len_mask)) {
836
        size++;
837
        len_mask >>= 1;
838
    }
839
    if (size > 8)
840
      return 0;
841
    total &= (len_mask - 1);
842
    while (n < size)
843
        total = (total << 8) | p->buf[4 + n++];
844

    
845
    /* Does the probe data contain the whole header? */
846
    if (p->buf_size < 4 + size + total)
847
      return 0;
848

    
849
    /* The header must contain the document type 'matroska'. For now,
850
     * we don't parse the whole header but simply check for the
851
     * availability of that array of characters inside the header.
852
     * Not fully fool-proof, but good enough. */
853
    for (n = 4+size; n <= 4+size+total-(sizeof(probe_data)-1); n++)
854
        if (!memcmp(p->buf+n, probe_data, sizeof(probe_data)-1))
855
            return AVPROBE_SCORE_MAX;
856

    
857
    return 0;
858
}
859

    
860
static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
861
                                                 int num)
862
{
863
    MatroskaTrack *tracks = matroska->tracks.elem;
864
    int i;
865

    
866
    for (i=0; i < matroska->tracks.nb_elem; i++)
867
        if (tracks[i].num == num)
868
            return &tracks[i];
869

    
870
    av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
871
    return NULL;
872
}
873

    
874
static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
875
                                  MatroskaTrack *track)
876
{
877
    MatroskaTrackEncoding *encodings = track->encodings.elem;
878
    uint8_t* data = *buf;
879
    int isize = *buf_size;
880
    uint8_t* pkt_data = NULL;
881
    int pkt_size = isize;
882
    int result = 0;
883
    int olen;
884

    
885
    switch (encodings[0].compression.algo) {
886
    case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
887
        return encodings[0].compression.settings.size;
888
    case MATROSKA_TRACK_ENCODING_COMP_LZO:
889
        do {
890
            olen = pkt_size *= 3;
891
            pkt_data = av_realloc(pkt_data, pkt_size+AV_LZO_OUTPUT_PADDING);
892
            result = av_lzo1x_decode(pkt_data, &olen, data, &isize);
893
        } while (result==AV_LZO_OUTPUT_FULL && pkt_size<10000000);
894
        if (result)
895
            goto failed;
896
        pkt_size -= olen;
897
        break;
898
#if CONFIG_ZLIB
899
    case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
900
        z_stream zstream = {0};
901
        if (inflateInit(&zstream) != Z_OK)
902
            return -1;
903
        zstream.next_in = data;
904
        zstream.avail_in = isize;
905
        do {
906
            pkt_size *= 3;
907
            pkt_data = av_realloc(pkt_data, pkt_size);
908
            zstream.avail_out = pkt_size - zstream.total_out;
909
            zstream.next_out = pkt_data + zstream.total_out;
910
            result = inflate(&zstream, Z_NO_FLUSH);
911
        } while (result==Z_OK && pkt_size<10000000);
912
        pkt_size = zstream.total_out;
913
        inflateEnd(&zstream);
914
        if (result != Z_STREAM_END)
915
            goto failed;
916
        break;
917
    }
918
#endif
919
#if CONFIG_BZLIB
920
    case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
921
        bz_stream bzstream = {0};
922
        if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
923
            return -1;
924
        bzstream.next_in = data;
925
        bzstream.avail_in = isize;
926
        do {
927
            pkt_size *= 3;
928
            pkt_data = av_realloc(pkt_data, pkt_size);
929
            bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
930
            bzstream.next_out = pkt_data + bzstream.total_out_lo32;
931
            result = BZ2_bzDecompress(&bzstream);
932
        } while (result==BZ_OK && pkt_size<10000000);
933
        pkt_size = bzstream.total_out_lo32;
934
        BZ2_bzDecompressEnd(&bzstream);
935
        if (result != BZ_STREAM_END)
936
            goto failed;
937
        break;
938
    }
939
#endif
940
    default:
941
        return -1;
942
    }
943

    
944
    *buf = pkt_data;
945
    *buf_size = pkt_size;
946
    return 0;
947
 failed:
948
    av_free(pkt_data);
949
    return -1;
950
}
951

    
952
static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
953
                                    AVPacket *pkt, uint64_t display_duration)
954
{
955
    char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
956
    for (; *ptr!=',' && ptr<end-1; ptr++);
957
    if (*ptr == ',')
958
        layer = ++ptr;
959
    for (; *ptr!=',' && ptr<end-1; ptr++);
960
    if (*ptr == ',') {
961
        int64_t end_pts = pkt->pts + display_duration;
962
        int sc = matroska->time_scale * pkt->pts / 10000000;
963
        int ec = matroska->time_scale * end_pts  / 10000000;
964
        int sh, sm, ss, eh, em, es, len;
965
        sh = sc/360000;  sc -= 360000*sh;
966
        sm = sc/  6000;  sc -=   6000*sm;
967
        ss = sc/   100;  sc -=    100*ss;
968
        eh = ec/360000;  ec -= 360000*eh;
969
        em = ec/  6000;  ec -=   6000*em;
970
        es = ec/   100;  ec -=    100*es;
971
        *ptr++ = '\0';
972
        len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
973
        if (!(line = av_malloc(len)))
974
            return;
975
        snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
976
                 layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
977
        av_free(pkt->data);
978
        pkt->data = line;
979
        pkt->size = strlen(line);
980
    }
981
}
982

    
983
static void matroska_merge_packets(AVPacket *out, AVPacket *in)
984
{
985
    out->data = av_realloc(out->data, out->size+in->size);
986
    memcpy(out->data+out->size, in->data, in->size);
987
    out->size += in->size;
988
    av_destruct_packet(in);
989
    av_free(in);
990
}
991

    
992
static void matroska_convert_tag(AVFormatContext *s, EbmlList *list,
993
                                 AVMetadata **metadata, char *prefix)
994
{
995
    MatroskaTag *tags = list->elem;
996
    char key[1024];
997
    int i;
998

    
999
    for (i=0; i < list->nb_elem; i++) {
1000
        const char *lang = strcmp(tags[i].lang, "und") ? tags[i].lang : NULL;
1001
        if (prefix)  snprintf(key, sizeof(key), "%s/%s", prefix, tags[i].name);
1002
        else         av_strlcpy(key, tags[i].name, sizeof(key));
1003
        if (tags[i].def || !lang) {
1004
        av_metadata_set(metadata, key, tags[i].string);
1005
        if (tags[i].sub.nb_elem)
1006
            matroska_convert_tag(s, &tags[i].sub, metadata, key);
1007
        }
1008
        if (lang) {
1009
            av_strlcat(key, "-", sizeof(key));
1010
            av_strlcat(key, lang, sizeof(key));
1011
            av_metadata_set(metadata, key, tags[i].string);
1012
            if (tags[i].sub.nb_elem)
1013
                matroska_convert_tag(s, &tags[i].sub, metadata, key);
1014
        }
1015
    }
1016
}
1017

    
1018
static void matroska_convert_tags(AVFormatContext *s)
1019
{
1020
    MatroskaDemuxContext *matroska = s->priv_data;
1021
    MatroskaTags *tags = matroska->tags.elem;
1022
    int i, j;
1023

    
1024
    for (i=0; i < matroska->tags.nb_elem; i++) {
1025
        if (tags[i].target.attachuid) {
1026
            MatroskaAttachement *attachment = matroska->attachments.elem;
1027
            for (j=0; j<matroska->attachments.nb_elem; j++)
1028
                if (attachment[j].uid == tags[i].target.attachuid)
1029
                    matroska_convert_tag(s, &tags[i].tag,
1030
                                         &attachment[j].stream->metadata, NULL);
1031
        } else if (tags[i].target.chapteruid) {
1032
            MatroskaChapter *chapter = matroska->chapters.elem;
1033
            for (j=0; j<matroska->chapters.nb_elem; j++)
1034
                if (chapter[j].uid == tags[i].target.chapteruid)
1035
                    matroska_convert_tag(s, &tags[i].tag,
1036
                                         &chapter[j].chapter->metadata, NULL);
1037
        } else if (tags[i].target.trackuid) {
1038
            MatroskaTrack *track = matroska->tracks.elem;
1039
            for (j=0; j<matroska->tracks.nb_elem; j++)
1040
                if (track[j].uid == tags[i].target.trackuid)
1041
                    matroska_convert_tag(s, &tags[i].tag,
1042
                                         &track[j].stream->metadata, NULL);
1043
        } else {
1044
            matroska_convert_tag(s, &tags[i].tag, &s->metadata,
1045
                                 tags[i].target.type);
1046
        }
1047
    }
1048
}
1049

    
1050
static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
1051
{
1052
    EbmlList *seekhead_list = &matroska->seekhead;
1053
    MatroskaSeekhead *seekhead = seekhead_list->elem;
1054
    uint32_t level_up = matroska->level_up;
1055
    int64_t before_pos = url_ftell(matroska->ctx->pb);
1056
    MatroskaLevel level;
1057
    int i;
1058

    
1059
    for (i=0; i<seekhead_list->nb_elem; i++) {
1060
        int64_t offset = seekhead[i].pos + matroska->segment_start;
1061

    
1062
        if (seekhead[i].pos <= before_pos
1063
            || seekhead[i].id == MATROSKA_ID_SEEKHEAD
1064
            || seekhead[i].id == MATROSKA_ID_CLUSTER)
1065
            continue;
1066

    
1067
        /* seek */
1068
        if (url_fseek(matroska->ctx->pb, offset, SEEK_SET) != offset)
1069
            continue;
1070

    
1071
        /* We don't want to lose our seekhead level, so we add
1072
         * a dummy. This is a crude hack. */
1073
        if (matroska->num_levels == EBML_MAX_DEPTH) {
1074
            av_log(matroska->ctx, AV_LOG_INFO,
1075
                   "Max EBML element depth (%d) reached, "
1076
                   "cannot parse further.\n", EBML_MAX_DEPTH);
1077
            break;
1078
        }
1079

    
1080
        level.start = 0;
1081
        level.length = (uint64_t)-1;
1082
        matroska->levels[matroska->num_levels] = level;
1083
        matroska->num_levels++;
1084

    
1085
        ebml_parse(matroska, matroska_segment, matroska);
1086

    
1087
        /* remove dummy level */
1088
        while (matroska->num_levels) {
1089
            uint64_t length = matroska->levels[--matroska->num_levels].length;
1090
            if (length == (uint64_t)-1)
1091
                break;
1092
        }
1093
    }
1094

    
1095
    /* seek back */
1096
    url_fseek(matroska->ctx->pb, before_pos, SEEK_SET);
1097
    matroska->level_up = level_up;
1098
}
1099

    
1100
static int matroska_aac_profile(char *codec_id)
1101
{
1102
    static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1103
    int profile;
1104

    
1105
    for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1106
        if (strstr(codec_id, aac_profiles[profile]))
1107
            break;
1108
    return profile + 1;
1109
}
1110

    
1111
static int matroska_aac_sri(int samplerate)
1112
{
1113
    int sri;
1114

    
1115
    for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
1116
        if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1117
            break;
1118
    return sri;
1119
}
1120

    
1121
static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1122
{
1123
    MatroskaDemuxContext *matroska = s->priv_data;
1124
    EbmlList *attachements_list = &matroska->attachments;
1125
    MatroskaAttachement *attachements;
1126
    EbmlList *chapters_list = &matroska->chapters;
1127
    MatroskaChapter *chapters;
1128
    MatroskaTrack *tracks;
1129
    EbmlList *index_list;
1130
    MatroskaIndex *index;
1131
    int index_scale = 1;
1132
    uint64_t max_start = 0;
1133
    Ebml ebml = { 0 };
1134
    AVStream *st;
1135
    int i, j;
1136

    
1137
    matroska->ctx = s;
1138

    
1139
    /* First read the EBML header. */
1140
    if (ebml_parse(matroska, ebml_syntax, &ebml)
1141
        || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1142
        || ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
1143
        || ebml.doctype_version > 2) {
1144
        av_log(matroska->ctx, AV_LOG_ERROR,
1145
               "EBML header using unsupported features\n"
1146
               "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1147
               ebml.version, ebml.doctype, ebml.doctype_version);
1148
        return AVERROR_PATCHWELCOME;
1149
    }
1150
    ebml_free(ebml_syntax, &ebml);
1151

    
1152
    /* The next thing is a segment. */
1153
    if (ebml_parse(matroska, matroska_segments, matroska) < 0)
1154
        return -1;
1155
    matroska_execute_seekhead(matroska);
1156

    
1157
    if (matroska->duration)
1158
        matroska->ctx->duration = matroska->duration * matroska->time_scale
1159
                                  * 1000 / AV_TIME_BASE;
1160
    av_metadata_set(&s->metadata, "title", matroska->title);
1161

    
1162
    tracks = matroska->tracks.elem;
1163
    for (i=0; i < matroska->tracks.nb_elem; i++) {
1164
        MatroskaTrack *track = &tracks[i];
1165
        enum CodecID codec_id = CODEC_ID_NONE;
1166
        EbmlList *encodings_list = &tracks->encodings;
1167
        MatroskaTrackEncoding *encodings = encodings_list->elem;
1168
        uint8_t *extradata = NULL;
1169
        int extradata_size = 0;
1170
        int extradata_offset = 0;
1171
        ByteIOContext b;
1172

    
1173
        /* Apply some sanity checks. */
1174
        if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1175
            track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1176
            track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1177
            av_log(matroska->ctx, AV_LOG_INFO,
1178
                   "Unknown or unsupported track type %"PRIu64"\n",
1179
                   track->type);
1180
            continue;
1181
        }
1182
        if (track->codec_id == NULL)
1183
            continue;
1184

    
1185
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1186
            if (!track->default_duration)
1187
                track->default_duration = 1000000000/track->video.frame_rate;
1188
            if (!track->video.display_width)
1189
                track->video.display_width = track->video.pixel_width;
1190
            if (!track->video.display_height)
1191
                track->video.display_height = track->video.pixel_height;
1192
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1193
            if (!track->audio.out_samplerate)
1194
                track->audio.out_samplerate = track->audio.samplerate;
1195
        }
1196
        if (encodings_list->nb_elem > 1) {
1197
            av_log(matroska->ctx, AV_LOG_ERROR,
1198
                   "Multiple combined encodings no supported");
1199
        } else if (encodings_list->nb_elem == 1) {
1200
            if (encodings[0].type ||
1201
                (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1202
#if CONFIG_ZLIB
1203
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1204
#endif
1205
#if CONFIG_BZLIB
1206
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1207
#endif
1208
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1209
                encodings[0].scope = 0;
1210
                av_log(matroska->ctx, AV_LOG_ERROR,
1211
                       "Unsupported encoding type");
1212
            } else if (track->codec_priv.size && encodings[0].scope&2) {
1213
                uint8_t *codec_priv = track->codec_priv.data;
1214
                int offset = matroska_decode_buffer(&track->codec_priv.data,
1215
                                                    &track->codec_priv.size,
1216
                                                    track);
1217
                if (offset < 0) {
1218
                    track->codec_priv.data = NULL;
1219
                    track->codec_priv.size = 0;
1220
                    av_log(matroska->ctx, AV_LOG_ERROR,
1221
                           "Failed to decode codec private data\n");
1222
                } else if (offset > 0) {
1223
                    track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1224
                    memcpy(track->codec_priv.data,
1225
                           encodings[0].compression.settings.data, offset);
1226
                    memcpy(track->codec_priv.data+offset, codec_priv,
1227
                           track->codec_priv.size);
1228
                    track->codec_priv.size += offset;
1229
                }
1230
                if (codec_priv != track->codec_priv.data)
1231
                    av_free(codec_priv);
1232
            }
1233
        }
1234

    
1235
        for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1236
            if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1237
                        strlen(ff_mkv_codec_tags[j].str))){
1238
                codec_id= ff_mkv_codec_tags[j].id;
1239
                break;
1240
            }
1241
        }
1242

    
1243
        st = track->stream = av_new_stream(s, 0);
1244
        if (st == NULL)
1245
            return AVERROR(ENOMEM);
1246

    
1247
        if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1248
            && track->codec_priv.size >= 40
1249
            && track->codec_priv.data != NULL) {
1250
            track->ms_compat = 1;
1251
            track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1252
            codec_id = ff_codec_get_id(ff_codec_bmp_tags, track->video.fourcc);
1253
            extradata_offset = 40;
1254
        } else if (!strcmp(track->codec_id, "A_MS/ACM")
1255
                   && track->codec_priv.size >= 14
1256
                   && track->codec_priv.data != NULL) {
1257
            init_put_byte(&b, track->codec_priv.data, track->codec_priv.size,
1258
                          URL_RDONLY, NULL, NULL, NULL, NULL);
1259
            ff_get_wav_header(&b, st->codec, track->codec_priv.size);
1260
            codec_id = st->codec->codec_id;
1261
            extradata_offset = FFMIN(track->codec_priv.size, 18);
1262
        } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1263
                   && (track->codec_priv.size >= 86)
1264
                   && (track->codec_priv.data != NULL)) {
1265
            track->video.fourcc = AV_RL32(track->codec_priv.data);
1266
            codec_id=ff_codec_get_id(codec_movvideo_tags, track->video.fourcc);
1267
        } else if (codec_id == CODEC_ID_PCM_S16BE) {
1268
            switch (track->audio.bitdepth) {
1269
            case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1270
            case 24:  codec_id = CODEC_ID_PCM_S24BE;  break;
1271
            case 32:  codec_id = CODEC_ID_PCM_S32BE;  break;
1272
            }
1273
        } else if (codec_id == CODEC_ID_PCM_S16LE) {
1274
            switch (track->audio.bitdepth) {
1275
            case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1276
            case 24:  codec_id = CODEC_ID_PCM_S24LE;  break;
1277
            case 32:  codec_id = CODEC_ID_PCM_S32LE;  break;
1278
            }
1279
        } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1280
            codec_id = CODEC_ID_PCM_F64LE;
1281
        } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1282
            int profile = matroska_aac_profile(track->codec_id);
1283
            int sri = matroska_aac_sri(track->audio.samplerate);
1284
            extradata = av_malloc(5);
1285
            if (extradata == NULL)
1286
                return AVERROR(ENOMEM);
1287
            extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1288
            extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1289
            if (strstr(track->codec_id, "SBR")) {
1290
                sri = matroska_aac_sri(track->audio.out_samplerate);
1291
                extradata[2] = 0x56;
1292
                extradata[3] = 0xE5;
1293
                extradata[4] = 0x80 | (sri<<3);
1294
                extradata_size = 5;
1295
            } else
1296
                extradata_size = 2;
1297
        } else if (codec_id == CODEC_ID_TTA) {
1298
            extradata_size = 30;
1299
            extradata = av_mallocz(extradata_size);
1300
            if (extradata == NULL)
1301
                return AVERROR(ENOMEM);
1302
            init_put_byte(&b, extradata, extradata_size, 1,
1303
                          NULL, NULL, NULL, NULL);
1304
            put_buffer(&b, "TTA1", 4);
1305
            put_le16(&b, 1);
1306
            put_le16(&b, track->audio.channels);
1307
            put_le16(&b, track->audio.bitdepth);
1308
            put_le32(&b, track->audio.out_samplerate);
1309
            put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1310
        } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1311
                   codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1312
            extradata_offset = 26;
1313
        } else if (codec_id == CODEC_ID_RA_144) {
1314
            track->audio.out_samplerate = 8000;
1315
            track->audio.channels = 1;
1316
        } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1317
                   codec_id == CODEC_ID_ATRAC3 || codec_id == CODEC_ID_SIPR) {
1318
            int flavor;
1319
            init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1320
                          0, NULL, NULL, NULL, NULL);
1321
            url_fskip(&b, 22);
1322
            flavor                       = get_be16(&b);
1323
            track->audio.coded_framesize = get_be32(&b);
1324
            url_fskip(&b, 12);
1325
            track->audio.sub_packet_h    = get_be16(&b);
1326
            track->audio.frame_size      = get_be16(&b);
1327
            track->audio.sub_packet_size = get_be16(&b);
1328
            track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1329
            if (codec_id == CODEC_ID_RA_288) {
1330
                st->codec->block_align = track->audio.coded_framesize;
1331
                track->codec_priv.size = 0;
1332
            } else {
1333
                if (codec_id == CODEC_ID_SIPR && flavor < 4) {
1334
                    const int sipr_bit_rate[4] = { 6504, 8496, 5000, 16000 };
1335
                    track->audio.sub_packet_size = ff_sipr_subpk_size[flavor];
1336
                    st->codec->bit_rate = sipr_bit_rate[flavor];
1337
                }
1338
                st->codec->block_align = track->audio.sub_packet_size;
1339
                extradata_offset = 78;
1340
            }
1341
        }
1342
        track->codec_priv.size -= extradata_offset;
1343

    
1344
        if (codec_id == CODEC_ID_NONE)
1345
            av_log(matroska->ctx, AV_LOG_INFO,
1346
                   "Unknown/unsupported CodecID %s.\n", track->codec_id);
1347

    
1348
        if (track->time_scale < 0.01)
1349
            track->time_scale = 1.0;
1350
        av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1351

    
1352
        st->codec->codec_id = codec_id;
1353
        st->start_time = 0;
1354
        if (strcmp(track->language, "und"))
1355
            av_metadata_set(&st->metadata, "language", track->language);
1356
        av_metadata_set(&st->metadata, "title", track->name);
1357

    
1358
        if (track->flag_default)
1359
            st->disposition |= AV_DISPOSITION_DEFAULT;
1360

    
1361
        if (track->default_duration)
1362
            av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1363
                      track->default_duration, 1000000000, 30000);
1364

    
1365
        if (!st->codec->extradata) {
1366
            if(extradata){
1367
                st->codec->extradata = extradata;
1368
                st->codec->extradata_size = extradata_size;
1369
            } else if(track->codec_priv.data && track->codec_priv.size > 0){
1370
                st->codec->extradata = av_mallocz(track->codec_priv.size +
1371
                                                  FF_INPUT_BUFFER_PADDING_SIZE);
1372
                if(st->codec->extradata == NULL)
1373
                    return AVERROR(ENOMEM);
1374
                st->codec->extradata_size = track->codec_priv.size;
1375
                memcpy(st->codec->extradata,
1376
                       track->codec_priv.data + extradata_offset,
1377
                       track->codec_priv.size);
1378
            }
1379
        }
1380

    
1381
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1382
            st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
1383
            st->codec->codec_tag  = track->video.fourcc;
1384
            st->codec->width  = track->video.pixel_width;
1385
            st->codec->height = track->video.pixel_height;
1386
            av_reduce(&st->sample_aspect_ratio.num,
1387
                      &st->sample_aspect_ratio.den,
1388
                      st->codec->height * track->video.display_width,
1389
                      st->codec-> width * track->video.display_height,
1390
                      255);
1391
            if (st->codec->codec_id != CODEC_ID_H264)
1392
            st->need_parsing = AVSTREAM_PARSE_HEADERS;
1393
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1394
            st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
1395
            st->codec->sample_rate = track->audio.out_samplerate;
1396
            st->codec->channels = track->audio.channels;
1397
        } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1398
            st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
1399
        }
1400
    }
1401

    
1402
    attachements = attachements_list->elem;
1403
    for (j=0; j<attachements_list->nb_elem; j++) {
1404
        if (!(attachements[j].filename && attachements[j].mime &&
1405
              attachements[j].bin.data && attachements[j].bin.size > 0)) {
1406
            av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1407
        } else {
1408
            AVStream *st = av_new_stream(s, 0);
1409
            if (st == NULL)
1410
                break;
1411
            av_metadata_set(&st->metadata, "filename",attachements[j].filename);
1412
            st->codec->codec_id = CODEC_ID_NONE;
1413
            st->codec->codec_type = AVMEDIA_TYPE_ATTACHMENT;
1414
            st->codec->extradata  = av_malloc(attachements[j].bin.size);
1415
            if(st->codec->extradata == NULL)
1416
                break;
1417
            st->codec->extradata_size = attachements[j].bin.size;
1418
            memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1419

    
1420
            for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1421
                if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1422
                             strlen(ff_mkv_mime_tags[i].str))) {
1423
                    st->codec->codec_id = ff_mkv_mime_tags[i].id;
1424
                    break;
1425
                }
1426
            }
1427
            attachements[j].stream = st;
1428
        }
1429
    }
1430

    
1431
    chapters = chapters_list->elem;
1432
    for (i=0; i<chapters_list->nb_elem; i++)
1433
        if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid
1434
            && (max_start==0 || chapters[i].start > max_start)) {
1435
            chapters[i].chapter =
1436
            ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1437
                           chapters[i].start, chapters[i].end,
1438
                           chapters[i].title);
1439
            av_metadata_set(&chapters[i].chapter->metadata,
1440
                            "title", chapters[i].title);
1441
            max_start = chapters[i].start;
1442
        }
1443

    
1444
    index_list = &matroska->index;
1445
    index = index_list->elem;
1446
    if (index_list->nb_elem
1447
        && index[0].time > 100000000000000/matroska->time_scale) {
1448
        av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1449
        index_scale = matroska->time_scale;
1450
    }
1451
    for (i=0; i<index_list->nb_elem; i++) {
1452
        EbmlList *pos_list = &index[i].pos;
1453
        MatroskaIndexPos *pos = pos_list->elem;
1454
        for (j=0; j<pos_list->nb_elem; j++) {
1455
            MatroskaTrack *track = matroska_find_track_by_num(matroska,
1456
                                                              pos[j].track);
1457
            if (track && track->stream)
1458
                av_add_index_entry(track->stream,
1459
                                   pos[j].pos + matroska->segment_start,
1460
                                   index[i].time/index_scale, 0, 0,
1461
                                   AVINDEX_KEYFRAME);
1462
        }
1463
    }
1464

    
1465
    matroska_convert_tags(s);
1466

    
1467
    return 0;
1468
}
1469

    
1470
/*
1471
 * Put one packet in an application-supplied AVPacket struct.
1472
 * Returns 0 on success or -1 on failure.
1473
 */
1474
static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1475
                                   AVPacket *pkt)
1476
{
1477
    if (matroska->num_packets > 0) {
1478
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1479
        av_free(matroska->packets[0]);
1480
        if (matroska->num_packets > 1) {
1481
            memmove(&matroska->packets[0], &matroska->packets[1],
1482
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
1483
            matroska->packets =
1484
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
1485
                           sizeof(AVPacket *));
1486
        } else {
1487
            av_freep(&matroska->packets);
1488
        }
1489
        matroska->num_packets--;
1490
        return 0;
1491
    }
1492

    
1493
    return -1;
1494
}
1495

    
1496
/*
1497
 * Free all packets in our internal queue.
1498
 */
1499
static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1500
{
1501
    if (matroska->packets) {
1502
        int n;
1503
        for (n = 0; n < matroska->num_packets; n++) {
1504
            av_free_packet(matroska->packets[n]);
1505
            av_free(matroska->packets[n]);
1506
        }
1507
        av_freep(&matroska->packets);
1508
        matroska->num_packets = 0;
1509
    }
1510
}
1511

    
1512
static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1513
                                int size, int64_t pos, uint64_t cluster_time,
1514
                                uint64_t duration, int is_keyframe,
1515
                                int64_t cluster_pos)
1516
{
1517
    uint64_t timecode = AV_NOPTS_VALUE;
1518
    MatroskaTrack *track;
1519
    int res = 0;
1520
    AVStream *st;
1521
    AVPacket *pkt;
1522
    int16_t block_time;
1523
    uint32_t *lace_size = NULL;
1524
    int n, flags, laces = 0;
1525
    uint64_t num;
1526

    
1527
    if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1528
        av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1529
        return res;
1530
    }
1531
    data += n;
1532
    size -= n;
1533

    
1534
    track = matroska_find_track_by_num(matroska, num);
1535
    if (size <= 3 || !track || !track->stream) {
1536
        av_log(matroska->ctx, AV_LOG_INFO,
1537
               "Invalid stream %"PRIu64" or size %u\n", num, size);
1538
        return res;
1539
    }
1540
    st = track->stream;
1541
    if (st->discard >= AVDISCARD_ALL)
1542
        return res;
1543
    if (duration == AV_NOPTS_VALUE)
1544
        duration = track->default_duration / matroska->time_scale;
1545

    
1546
    block_time = AV_RB16(data);
1547
    data += 2;
1548
    flags = *data++;
1549
    size -= 3;
1550
    if (is_keyframe == -1)
1551
        is_keyframe = flags & 0x80 ? AV_PKT_FLAG_KEY : 0;
1552

    
1553
    if (cluster_time != (uint64_t)-1
1554
        && (block_time >= 0 || cluster_time >= -block_time)) {
1555
        timecode = cluster_time + block_time;
1556
        if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
1557
            && timecode < track->end_timecode)
1558
            is_keyframe = 0;  /* overlapping subtitles are not key frame */
1559
        if (is_keyframe)
1560
            av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
1561
        track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
1562
    }
1563

    
1564
    if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1565
        if (!is_keyframe || timecode < matroska->skip_to_timecode)
1566
            return res;
1567
        matroska->skip_to_keyframe = 0;
1568
    }
1569

    
1570
    switch ((flags & 0x06) >> 1) {
1571
        case 0x0: /* no lacing */
1572
            laces = 1;
1573
            lace_size = av_mallocz(sizeof(int));
1574
            lace_size[0] = size;
1575
            break;
1576

    
1577
        case 0x1: /* Xiph lacing */
1578
        case 0x2: /* fixed-size lacing */
1579
        case 0x3: /* EBML lacing */
1580
            assert(size>0); // size <=3 is checked before size-=3 above
1581
            laces = (*data) + 1;
1582
            data += 1;
1583
            size -= 1;
1584
            lace_size = av_mallocz(laces * sizeof(int));
1585

    
1586
            switch ((flags & 0x06) >> 1) {
1587
                case 0x1: /* Xiph lacing */ {
1588
                    uint8_t temp;
1589
                    uint32_t total = 0;
1590
                    for (n = 0; res == 0 && n < laces - 1; n++) {
1591
                        while (1) {
1592
                            if (size == 0) {
1593
                                res = -1;
1594
                                break;
1595
                            }
1596
                            temp = *data;
1597
                            lace_size[n] += temp;
1598
                            data += 1;
1599
                            size -= 1;
1600
                            if (temp != 0xff)
1601
                                break;
1602
                        }
1603
                        total += lace_size[n];
1604
                    }
1605
                    lace_size[n] = size - total;
1606
                    break;
1607
                }
1608

    
1609
                case 0x2: /* fixed-size lacing */
1610
                    for (n = 0; n < laces; n++)
1611
                        lace_size[n] = size / laces;
1612
                    break;
1613

    
1614
                case 0x3: /* EBML lacing */ {
1615
                    uint32_t total;
1616
                    n = matroska_ebmlnum_uint(matroska, data, size, &num);
1617
                    if (n < 0) {
1618
                        av_log(matroska->ctx, AV_LOG_INFO,
1619
                               "EBML block data error\n");
1620
                        break;
1621
                    }
1622
                    data += n;
1623
                    size -= n;
1624
                    total = lace_size[0] = num;
1625
                    for (n = 1; res == 0 && n < laces - 1; n++) {
1626
                        int64_t snum;
1627
                        int r;
1628
                        r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1629
                        if (r < 0) {
1630
                            av_log(matroska->ctx, AV_LOG_INFO,
1631
                                   "EBML block data error\n");
1632
                            break;
1633
                        }
1634
                        data += r;
1635
                        size -= r;
1636
                        lace_size[n] = lace_size[n - 1] + snum;
1637
                        total += lace_size[n];
1638
                    }
1639
                    lace_size[n] = size - total;
1640
                    break;
1641
                }
1642
            }
1643
            break;
1644
    }
1645

    
1646
    if (res == 0) {
1647
        for (n = 0; n < laces; n++) {
1648
            if ((st->codec->codec_id == CODEC_ID_RA_288 ||
1649
                 st->codec->codec_id == CODEC_ID_COOK ||
1650
                 st->codec->codec_id == CODEC_ID_SIPR ||
1651
                 st->codec->codec_id == CODEC_ID_ATRAC3) &&
1652
                 st->codec->block_align && track->audio.sub_packet_size) {
1653
                int a = st->codec->block_align;
1654
                int sps = track->audio.sub_packet_size;
1655
                int cfs = track->audio.coded_framesize;
1656
                int h = track->audio.sub_packet_h;
1657
                int y = track->audio.sub_packet_cnt;
1658
                int w = track->audio.frame_size;
1659
                int x;
1660

    
1661
                if (!track->audio.pkt_cnt) {
1662
                    if (st->codec->codec_id == CODEC_ID_RA_288)
1663
                        for (x=0; x<h/2; x++)
1664
                            memcpy(track->audio.buf+x*2*w+y*cfs,
1665
                                   data+x*cfs, cfs);
1666
                    else if (st->codec->codec_id == CODEC_ID_SIPR)
1667
                        memcpy(track->audio.buf + y*w, data, w);
1668
                    else
1669
                        for (x=0; x<w/sps; x++)
1670
                            memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1671

    
1672
                    if (++track->audio.sub_packet_cnt >= h) {
1673
                        if (st->codec->codec_id == CODEC_ID_SIPR)
1674
                            ff_rm_reorder_sipr_data(track->audio.buf, h, w);
1675
                        track->audio.sub_packet_cnt = 0;
1676
                        track->audio.pkt_cnt = h*w / a;
1677
                    }
1678
                }
1679
                while (track->audio.pkt_cnt) {
1680
                    pkt = av_mallocz(sizeof(AVPacket));
1681
                    av_new_packet(pkt, a);
1682
                    memcpy(pkt->data, track->audio.buf
1683
                           + a * (h*w / a - track->audio.pkt_cnt--), a);
1684
                    pkt->pos = pos;
1685
                    pkt->stream_index = st->index;
1686
                    dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1687
                }
1688
            } else {
1689
                MatroskaTrackEncoding *encodings = track->encodings.elem;
1690
                int offset = 0, pkt_size = lace_size[n];
1691
                uint8_t *pkt_data = data;
1692

    
1693
                if (lace_size[n] > size) {
1694
                    av_log(matroska->ctx, AV_LOG_ERROR, "Invalid packet size\n");
1695
                    break;
1696
                }
1697

    
1698
                if (encodings && encodings->scope & 1) {
1699
                    offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1700
                    if (offset < 0)
1701
                        continue;
1702
                }
1703

    
1704
                pkt = av_mallocz(sizeof(AVPacket));
1705
                /* XXX: prevent data copy... */
1706
                if (av_new_packet(pkt, pkt_size+offset) < 0) {
1707
                    av_free(pkt);
1708
                    res = AVERROR(ENOMEM);
1709
                    break;
1710
                }
1711
                if (offset)
1712
                    memcpy (pkt->data, encodings->compression.settings.data, offset);
1713
                memcpy (pkt->data+offset, pkt_data, pkt_size);
1714

    
1715
                if (pkt_data != data)
1716
                    av_free(pkt_data);
1717

    
1718
                if (n == 0)
1719
                    pkt->flags = is_keyframe;
1720
                pkt->stream_index = st->index;
1721

    
1722
                if (track->ms_compat)
1723
                    pkt->dts = timecode;
1724
                else
1725
                    pkt->pts = timecode;
1726
                pkt->pos = pos;
1727
                if (st->codec->codec_id == CODEC_ID_TEXT)
1728
                    pkt->convergence_duration = duration;
1729
                else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1730
                    pkt->duration = duration;
1731

    
1732
                if (st->codec->codec_id == CODEC_ID_SSA)
1733
                    matroska_fix_ass_packet(matroska, pkt, duration);
1734

    
1735
                if (matroska->prev_pkt &&
1736
                    timecode != AV_NOPTS_VALUE &&
1737
                    matroska->prev_pkt->pts == timecode &&
1738
                    matroska->prev_pkt->stream_index == st->index)
1739
                    matroska_merge_packets(matroska->prev_pkt, pkt);
1740
                else {
1741
                    dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1742
                    matroska->prev_pkt = pkt;
1743
                }
1744
            }
1745

    
1746
            if (timecode != AV_NOPTS_VALUE)
1747
                timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1748
            data += lace_size[n];
1749
            size -= lace_size[n];
1750
        }
1751
    }
1752

    
1753
    av_free(lace_size);
1754
    return res;
1755
}
1756

    
1757
static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1758
{
1759
    MatroskaCluster cluster = { 0 };
1760
    EbmlList *blocks_list;
1761
    MatroskaBlock *blocks;
1762
    int i, res;
1763
    int64_t pos = url_ftell(matroska->ctx->pb);
1764
    matroska->prev_pkt = NULL;
1765
    if (matroska->has_cluster_id){
1766
        /* For the first cluster we parse, its ID was already read as
1767
           part of matroska_read_header(), so don't read it again */
1768
        res = ebml_parse_id(matroska, matroska_clusters,
1769
                            MATROSKA_ID_CLUSTER, &cluster);
1770
        pos -= 4;  /* sizeof the ID which was already read */
1771
        matroska->has_cluster_id = 0;
1772
    } else
1773
        res = ebml_parse(matroska, matroska_clusters, &cluster);
1774
    blocks_list = &cluster.blocks;
1775
    blocks = blocks_list->elem;
1776
    for (i=0; i<blocks_list->nb_elem; i++)
1777
        if (blocks[i].bin.size > 0) {
1778
            int is_keyframe = blocks[i].non_simple ? !blocks[i].reference : -1;
1779
            res=matroska_parse_block(matroska,
1780
                                     blocks[i].bin.data, blocks[i].bin.size,
1781
                                     blocks[i].bin.pos,  cluster.timecode,
1782
                                     blocks[i].duration, is_keyframe,
1783
                                     pos);
1784
        }
1785
    ebml_free(matroska_cluster, &cluster);
1786
    if (res < 0)  matroska->done = 1;
1787
    return res;
1788
}
1789

    
1790
static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1791
{
1792
    MatroskaDemuxContext *matroska = s->priv_data;
1793

    
1794
    while (matroska_deliver_packet(matroska, pkt)) {
1795
        if (matroska->done)
1796
            return AVERROR_EOF;
1797
        matroska_parse_cluster(matroska);
1798
    }
1799

    
1800
    return 0;
1801
}
1802

    
1803
static int matroska_read_seek(AVFormatContext *s, int stream_index,
1804
                              int64_t timestamp, int flags)
1805
{
1806
    MatroskaDemuxContext *matroska = s->priv_data;
1807
    MatroskaTrack *tracks = matroska->tracks.elem;
1808
    AVStream *st = s->streams[stream_index];
1809
    int i, index, index_sub, index_min;
1810

    
1811
    if (!st->nb_index_entries)
1812
        return 0;
1813
    timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
1814

    
1815
    if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1816
        url_fseek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
1817
        while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1818
            matroska_clear_queue(matroska);
1819
            if (matroska_parse_cluster(matroska) < 0)
1820
                break;
1821
        }
1822
    }
1823

    
1824
    matroska_clear_queue(matroska);
1825
    if (index < 0)
1826
        return 0;
1827

    
1828
    index_min = index;
1829
    for (i=0; i < matroska->tracks.nb_elem; i++) {
1830
        tracks[i].end_timecode = 0;
1831
        if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
1832
            && !tracks[i].stream->discard != AVDISCARD_ALL) {
1833
            index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
1834
            if (index_sub >= 0
1835
                && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
1836
                && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
1837
                index_min = index_sub;
1838
        }
1839
    }
1840

    
1841
    url_fseek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
1842
    matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1843
    matroska->skip_to_timecode = st->index_entries[index].timestamp;
1844
    matroska->done = 0;
1845
    av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1846
    return 0;
1847
}
1848

    
1849
static int matroska_read_close(AVFormatContext *s)
1850
{
1851
    MatroskaDemuxContext *matroska = s->priv_data;
1852
    MatroskaTrack *tracks = matroska->tracks.elem;
1853
    int n;
1854

    
1855
    matroska_clear_queue(matroska);
1856

    
1857
    for (n=0; n < matroska->tracks.nb_elem; n++)
1858
        if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1859
            av_free(tracks[n].audio.buf);
1860
    ebml_free(matroska_segment, matroska);
1861

    
1862
    return 0;
1863
}
1864

    
1865
AVInputFormat matroska_demuxer = {
1866
    "matroska",
1867
    NULL_IF_CONFIG_SMALL("Matroska file format"),
1868
    sizeof(MatroskaDemuxContext),
1869
    matroska_probe,
1870
    matroska_read_header,
1871
    matroska_read_packet,
1872
    matroska_read_close,
1873
    matroska_read_seek,
1874
    .metadata_conv = ff_mkv_metadata_conv,
1875
};