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ffmpeg / libavformat / matroskadec.c @ 1ca610c0

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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 matroskadec.c
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 * Matroska file demuxer
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 * by Ronald Bultje <rbultje@ronald.bitfreak.net>
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 * with a little help from Moritz Bunkus <moritz@bunkus.org>
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 * totally reworked by Aurelien Jacobs <aurel@gnuage.org>
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 * Specs available on the Matroska project page: http://www.matroska.org/.
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 */
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#include <stdio.h>
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#include "avformat.h"
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/* For codec_get_id(). */
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#include "riff.h"
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#include "isom.h"
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#include "matroska.h"
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#include "libavcodec/mpeg4audio.h"
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#include "libavutil/intfloat_readwrite.h"
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#include "libavutil/avstring.h"
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#include "libavutil/lzo.h"
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#ifdef CONFIG_ZLIB
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#include <zlib.h>
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#endif
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#ifdef CONFIG_BZLIB
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#include <bzlib.h>
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#endif
47

    
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typedef enum {
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    EBML_NONE,
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    EBML_UINT,
51
    EBML_FLOAT,
52
    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;
59

    
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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;
72

    
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typedef struct {
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    int nb_elem;
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    void *elem;
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} EbmlList;
77

    
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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;
83

    
84
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;
90
} Ebml;
91

    
92
typedef struct {
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    uint64_t algo;
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    EbmlBin  settings;
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} MatroskaTrackCompression;
96

    
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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;
102

    
103
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;
111

    
112
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;
117

    
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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;
127

    
128
typedef struct {
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    uint64_t num;
130
    uint64_t type;
131
    char    *codec_id;
132
    EbmlBin  codec_priv;
133
    char    *language;
134
    double time_scale;
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    uint64_t default_duration;
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    uint64_t flag_default;
137
    MatroskaTrackVideo video;
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    MatroskaTrackAudio audio;
139
    EbmlList encodings;
140

    
141
    AVStream *stream;
142
    int64_t end_timecode;
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} MatroskaTrack;
144

    
145
typedef struct {
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    char *filename;
147
    char *mime;
148
    EbmlBin bin;
149
} MatroskaAttachement;
150

    
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typedef struct {
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    uint64_t start;
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    uint64_t end;
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    uint64_t uid;
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    char    *title;
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} MatroskaChapter;
157

    
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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;
162

    
163
typedef struct {
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    uint64_t time;
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    EbmlList pos;
166
} MatroskaIndex;
167

    
168
typedef struct {
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    char *name;
170
    char *string;
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    EbmlList sub;
172
} MatroskaTag;
173

    
174
typedef struct {
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    uint64_t id;
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    uint64_t pos;
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} MatroskaSeekhead;
178

    
179
typedef struct {
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    uint64_t start;
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    uint64_t length;
182
} MatroskaLevel;
183

    
184
typedef struct {
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    AVFormatContext *ctx;
186

    
187
    /* EBML stuff */
188
    int num_levels;
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    MatroskaLevel levels[EBML_MAX_DEPTH];
190
    int level_up;
191

    
192
    uint64_t time_scale;
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    double   duration;
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    char    *title;
195
    EbmlList tracks;
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    EbmlList attachments;
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    EbmlList chapters;
198
    EbmlList index;
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    EbmlList tags;
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    EbmlList seekhead;
201

    
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    /* byte position of the segment inside the stream */
203
    int64_t segment_start;
204

    
205
    /* the packet queue */
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    AVPacket **packets;
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    int num_packets;
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    AVPacket *prev_pkt;
209

    
210
    int done;
211
    int has_cluster_id;
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213
    /* 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;
217

    
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typedef struct {
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    uint64_t duration;
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    int64_t  reference;
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    EbmlBin  bin;
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} MatroskaBlock;
223

    
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typedef struct {
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    uint64_t timecode;
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    EbmlList blocks;
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} MatroskaCluster;
228

    
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static EbmlSyntax ebml_header[] = {
230
    { EBML_ID_EBMLREADVERSION,        EBML_UINT, 0, offsetof(Ebml,version), {.u=EBML_VERSION} },
231
    { EBML_ID_EBMLMAXSIZELENGTH,      EBML_UINT, 0, offsetof(Ebml,max_size), {.u=8} },
232
    { EBML_ID_EBMLMAXIDLENGTH,        EBML_UINT, 0, offsetof(Ebml,id_length), {.u=4} },
233
    { EBML_ID_DOCTYPE,                EBML_STR,  0, offsetof(Ebml,doctype), {.s="(none)"} },
234
    { EBML_ID_DOCTYPEREADVERSION,     EBML_UINT, 0, offsetof(Ebml,doctype_version), {.u=1} },
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    { EBML_ID_EBMLVERSION,            EBML_NONE },
236
    { EBML_ID_DOCTYPEVERSION,         EBML_NONE },
237
    { 0 }
238
};
239

    
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static EbmlSyntax ebml_syntax[] = {
241
    { EBML_ID_HEADER,                 EBML_NEST, 0, 0, {.n=ebml_header} },
242
    { 0 }
243
};
244

    
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static EbmlSyntax matroska_info[] = {
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    { MATROSKA_ID_TIMECODESCALE,      EBML_UINT,  0, offsetof(MatroskaDemuxContext,time_scale), {.u=1000000} },
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    { MATROSKA_ID_DURATION,           EBML_FLOAT, 0, offsetof(MatroskaDemuxContext,duration) },
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    { MATROSKA_ID_TITLE,              EBML_UTF8,  0, offsetof(MatroskaDemuxContext,title) },
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    { MATROSKA_ID_WRITINGAPP,         EBML_NONE },
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    { MATROSKA_ID_MUXINGAPP,          EBML_NONE },
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    { MATROSKA_ID_DATEUTC,            EBML_NONE },
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    { MATROSKA_ID_SEGMENTUID,         EBML_NONE },
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    { 0 }
254
};
255

    
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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) },
259
    { 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 },
270
    { MATROSKA_ID_VIDEOASPECTRATIO,   EBML_NONE },
271
    { 0 }
272
};
273

    
274
static EbmlSyntax matroska_track_audio[] = {
275
    { MATROSKA_ID_AUDIOSAMPLINGFREQ,  EBML_FLOAT,0, offsetof(MatroskaTrackAudio,samplerate), {.f=8000.0} },
276
    { MATROSKA_ID_AUDIOOUTSAMPLINGFREQ,EBML_FLOAT,0,offsetof(MatroskaTrackAudio,out_samplerate) },
277
    { MATROSKA_ID_AUDIOBITDEPTH,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,bitdepth) },
278
    { MATROSKA_ID_AUDIOCHANNELS,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
279
    { 0 }
280
};
281

    
282
static EbmlSyntax matroska_track_encoding_compression[] = {
283
    { MATROSKA_ID_ENCODINGCOMPALGO,   EBML_UINT, 0, offsetof(MatroskaTrackCompression,algo), {.u=0} },
284
    { MATROSKA_ID_ENCODINGCOMPSETTINGS,EBML_BIN, 0, offsetof(MatroskaTrackCompression,settings) },
285
    { 0 }
286
};
287

    
288
static EbmlSyntax matroska_track_encoding[] = {
289
    { MATROSKA_ID_ENCODINGSCOPE,      EBML_UINT, 0, offsetof(MatroskaTrackEncoding,scope), {.u=1} },
290
    { MATROSKA_ID_ENCODINGTYPE,       EBML_UINT, 0, offsetof(MatroskaTrackEncoding,type), {.u=0} },
291
    { MATROSKA_ID_ENCODINGCOMPRESSION,EBML_NEST, 0, offsetof(MatroskaTrackEncoding,compression), {.n=matroska_track_encoding_compression} },
292
    { MATROSKA_ID_ENCODINGORDER,      EBML_NONE },
293
    { 0 }
294
};
295

    
296
static EbmlSyntax matroska_track_encodings[] = {
297
    { MATROSKA_ID_TRACKCONTENTENCODING, EBML_NEST, sizeof(MatroskaTrackEncoding), offsetof(MatroskaTrack,encodings), {.n=matroska_track_encoding} },
298
    { 0 }
299
};
300

    
301
static EbmlSyntax matroska_track[] = {
302
    { MATROSKA_ID_TRACKNUMBER,          EBML_UINT, 0, offsetof(MatroskaTrack,num) },
303
    { MATROSKA_ID_TRACKTYPE,            EBML_UINT, 0, offsetof(MatroskaTrack,type) },
304
    { MATROSKA_ID_CODECID,              EBML_STR,  0, offsetof(MatroskaTrack,codec_id) },
305
    { MATROSKA_ID_CODECPRIVATE,         EBML_BIN,  0, offsetof(MatroskaTrack,codec_priv) },
306
    { MATROSKA_ID_TRACKLANGUAGE,        EBML_UTF8, 0, offsetof(MatroskaTrack,language), {.s="eng"} },
307
    { MATROSKA_ID_TRACKDEFAULTDURATION, EBML_UINT, 0, offsetof(MatroskaTrack,default_duration) },
308
    { MATROSKA_ID_TRACKTIMECODESCALE,   EBML_FLOAT,0, offsetof(MatroskaTrack,time_scale), {.f=1.0} },
309
    { MATROSKA_ID_TRACKFLAGDEFAULT,     EBML_UINT, 0, offsetof(MatroskaTrack,flag_default), {.u=1} },
310
    { MATROSKA_ID_TRACKVIDEO,           EBML_NEST, 0, offsetof(MatroskaTrack,video), {.n=matroska_track_video} },
311
    { MATROSKA_ID_TRACKAUDIO,           EBML_NEST, 0, offsetof(MatroskaTrack,audio), {.n=matroska_track_audio} },
312
    { MATROSKA_ID_TRACKCONTENTENCODINGS,EBML_NEST, 0, 0, {.n=matroska_track_encodings} },
313
    { MATROSKA_ID_TRACKUID,             EBML_NONE },
314
    { MATROSKA_ID_TRACKNAME,            EBML_NONE },
315
    { MATROSKA_ID_TRACKFLAGENABLED,     EBML_NONE },
316
    { MATROSKA_ID_TRACKFLAGFORCED,      EBML_NONE },
317
    { MATROSKA_ID_TRACKFLAGLACING,      EBML_NONE },
318
    { MATROSKA_ID_CODECNAME,            EBML_NONE },
319
    { MATROSKA_ID_CODECDECODEALL,       EBML_NONE },
320
    { MATROSKA_ID_CODECINFOURL,         EBML_NONE },
321
    { MATROSKA_ID_CODECDOWNLOADURL,     EBML_NONE },
322
    { MATROSKA_ID_TRACKMINCACHE,        EBML_NONE },
323
    { MATROSKA_ID_TRACKMAXCACHE,        EBML_NONE },
324
    { MATROSKA_ID_TRACKMAXBLKADDID,     EBML_NONE },
325
    { 0 }
326
};
327

    
328
static EbmlSyntax matroska_tracks[] = {
329
    { MATROSKA_ID_TRACKENTRY,         EBML_NEST, sizeof(MatroskaTrack), offsetof(MatroskaDemuxContext,tracks), {.n=matroska_track} },
330
    { 0 }
331
};
332

    
333
static EbmlSyntax matroska_attachment[] = {
334
    { MATROSKA_ID_FILENAME,           EBML_UTF8, 0, offsetof(MatroskaAttachement,filename) },
335
    { MATROSKA_ID_FILEMIMETYPE,       EBML_STR,  0, offsetof(MatroskaAttachement,mime) },
336
    { MATROSKA_ID_FILEDATA,           EBML_BIN,  0, offsetof(MatroskaAttachement,bin) },
337
    { MATROSKA_ID_FILEDESC,           EBML_NONE },
338
    { MATROSKA_ID_FILEUID,            EBML_NONE },
339
    { 0 }
340
};
341

    
342
static EbmlSyntax matroska_attachments[] = {
343
    { MATROSKA_ID_ATTACHEDFILE,       EBML_NEST, sizeof(MatroskaAttachement), offsetof(MatroskaDemuxContext,attachments), {.n=matroska_attachment} },
344
    { 0 }
345
};
346

    
347
static EbmlSyntax matroska_chapter_display[] = {
348
    { MATROSKA_ID_CHAPSTRING,         EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
349
    { MATROSKA_ID_CHAPLANG,           EBML_NONE },
350
    { 0 }
351
};
352

    
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static EbmlSyntax matroska_chapter_entry[] = {
354
    { MATROSKA_ID_CHAPTERTIMESTART,   EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
355
    { MATROSKA_ID_CHAPTERTIMEEND,     EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
356
    { MATROSKA_ID_CHAPTERUID,         EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
357
    { MATROSKA_ID_CHAPTERDISPLAY,     EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
358
    { MATROSKA_ID_CHAPTERFLAGHIDDEN,  EBML_NONE },
359
    { MATROSKA_ID_CHAPTERFLAGENABLED, EBML_NONE },
360
    { MATROSKA_ID_CHAPTERPHYSEQUIV,   EBML_NONE },
361
    { MATROSKA_ID_CHAPTERATOM,        EBML_NONE },
362
    { 0 }
363
};
364

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

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

    
379
static EbmlSyntax matroska_index_pos[] = {
380
    { MATROSKA_ID_CUETRACK,           EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
381
    { MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos)   },
382
    { MATROSKA_ID_CUEBLOCKNUMBER,     EBML_NONE },
383
    { 0 }
384
};
385

    
386
static EbmlSyntax matroska_index_entry[] = {
387
    { MATROSKA_ID_CUETIME,            EBML_UINT, 0, offsetof(MatroskaIndex,time) },
388
    { MATROSKA_ID_CUETRACKPOSITION,   EBML_NEST, sizeof(MatroskaIndexPos), offsetof(MatroskaIndex,pos), {.n=matroska_index_pos} },
389
    { 0 }
390
};
391

    
392
static EbmlSyntax matroska_index[] = {
393
    { MATROSKA_ID_POINTENTRY,         EBML_NEST, sizeof(MatroskaIndex), offsetof(MatroskaDemuxContext,index), {.n=matroska_index_entry} },
394
    { 0 }
395
};
396

    
397
static EbmlSyntax matroska_simpletag[] = {
398
    { MATROSKA_ID_TAGNAME,            EBML_UTF8, 0, offsetof(MatroskaTag,name) },
399
    { MATROSKA_ID_TAGSTRING,          EBML_UTF8, 0, offsetof(MatroskaTag,string) },
400
    { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), offsetof(MatroskaTag,sub), {.n=matroska_simpletag} },
401
    { MATROSKA_ID_TAGLANG,            EBML_NONE },
402
    { MATROSKA_ID_TAGDEFAULT,         EBML_NONE },
403
    { 0 }
404
};
405

    
406
static EbmlSyntax matroska_tag[] = {
407
    { MATROSKA_ID_SIMPLETAG,          EBML_NEST, sizeof(MatroskaTag), 0, {.n=matroska_simpletag} },
408
    { MATROSKA_ID_TAGTARGETS,         EBML_NONE },
409
    { 0 }
410
};
411

    
412
static EbmlSyntax matroska_tags[] = {
413
    { MATROSKA_ID_TAG,                EBML_NEST, 0, offsetof(MatroskaDemuxContext,tags), {.n=matroska_tag} },
414
    { 0 }
415
};
416

    
417
static EbmlSyntax matroska_seekhead_entry[] = {
418
    { MATROSKA_ID_SEEKID,             EBML_UINT, 0, offsetof(MatroskaSeekhead,id) },
419
    { MATROSKA_ID_SEEKPOSITION,       EBML_UINT, 0, offsetof(MatroskaSeekhead,pos), {.u=-1} },
420
    { 0 }
421
};
422

    
423
static EbmlSyntax matroska_seekhead[] = {
424
    { MATROSKA_ID_SEEKENTRY,          EBML_NEST, sizeof(MatroskaSeekhead), offsetof(MatroskaDemuxContext,seekhead), {.n=matroska_seekhead_entry} },
425
    { 0 }
426
};
427

    
428
static EbmlSyntax matroska_segment[] = {
429
    { MATROSKA_ID_INFO,           EBML_NEST, 0, 0, {.n=matroska_info       } },
430
    { MATROSKA_ID_TRACKS,         EBML_NEST, 0, 0, {.n=matroska_tracks     } },
431
    { MATROSKA_ID_ATTACHMENTS,    EBML_NEST, 0, 0, {.n=matroska_attachments} },
432
    { MATROSKA_ID_CHAPTERS,       EBML_NEST, 0, 0, {.n=matroska_chapters   } },
433
    { MATROSKA_ID_CUES,           EBML_NEST, 0, 0, {.n=matroska_index      } },
434
    { MATROSKA_ID_TAGS,           EBML_NEST, 0, 0, {.n=matroska_tags       } },
435
    { MATROSKA_ID_SEEKHEAD,       EBML_NEST, 0, 0, {.n=matroska_seekhead   } },
436
    { MATROSKA_ID_CLUSTER,        EBML_STOP, 0, offsetof(MatroskaDemuxContext,has_cluster_id) },
437
    { 0 }
438
};
439

    
440
static EbmlSyntax matroska_segments[] = {
441
    { MATROSKA_ID_SEGMENT,        EBML_NEST, 0, 0, {.n=matroska_segment    } },
442
    { 0 }
443
};
444

    
445
static EbmlSyntax matroska_blockgroup[] = {
446
    { MATROSKA_ID_BLOCK,          EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
447
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_BIN,  0, offsetof(MatroskaBlock,bin) },
448
    { MATROSKA_ID_BLOCKDURATION,  EBML_UINT, 0, offsetof(MatroskaBlock,duration), {.u=AV_NOPTS_VALUE} },
449
    { MATROSKA_ID_BLOCKREFERENCE, EBML_UINT, 0, offsetof(MatroskaBlock,reference) },
450
    { 0 }
451
};
452

    
453
static EbmlSyntax matroska_cluster[] = {
454
    { MATROSKA_ID_CLUSTERTIMECODE,EBML_UINT,0, offsetof(MatroskaCluster,timecode) },
455
    { MATROSKA_ID_BLOCKGROUP,     EBML_NEST, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
456
    { MATROSKA_ID_SIMPLEBLOCK,    EBML_PASS, sizeof(MatroskaBlock), offsetof(MatroskaCluster,blocks), {.n=matroska_blockgroup} },
457
    { MATROSKA_ID_CLUSTERPOSITION,EBML_NONE },
458
    { MATROSKA_ID_CLUSTERPREVSIZE,EBML_NONE },
459
    { 0 }
460
};
461

    
462
static EbmlSyntax matroska_clusters[] = {
463
    { MATROSKA_ID_CLUSTER,        EBML_NEST, 0, 0, {.n=matroska_cluster} },
464
    { MATROSKA_ID_INFO,           EBML_NONE },
465
    { MATROSKA_ID_CUES,           EBML_NONE },
466
    { MATROSKA_ID_TAGS,           EBML_NONE },
467
    { MATROSKA_ID_SEEKHEAD,       EBML_NONE },
468
    { 0 }
469
};
470

    
471
#define SIZE_OFF(x) sizeof(((AVFormatContext*)0)->x),offsetof(AVFormatContext,x)
472
const struct {
473
    const char name[16];
474
    int   size;
475
    int   offset;
476
} metadata[] = {
477
    { "TITLE",           SIZE_OFF(title)      },
478
    { "ARTIST",          SIZE_OFF(author)     },
479
    { "WRITTEN_BY",      SIZE_OFF(author)     },
480
    { "LEAD_PERFORMER",  SIZE_OFF(author)     },
481
    { "COPYRIGHT",       SIZE_OFF(copyright)  },
482
    { "COMMENT",         SIZE_OFF(comment)    },
483
    { "ALBUM",           SIZE_OFF(album)      },
484
    { "DATE_WRITTEN",    SIZE_OFF(year)       },
485
    { "DATE_RELEASED",   SIZE_OFF(year)       },
486
    { "PART_NUMBER",     SIZE_OFF(track)      },
487
    { "GENRE",           SIZE_OFF(genre)      },
488
};
489

    
490
/*
491
 * Return: Whether we reached the end of a level in the hierarchy or not.
492
 */
493
static int ebml_level_end(MatroskaDemuxContext *matroska)
494
{
495
    ByteIOContext *pb = matroska->ctx->pb;
496
    int64_t pos = url_ftell(pb);
497

    
498
    if (matroska->num_levels > 0) {
499
        MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
500
        if (pos - level->start >= level->length) {
501
            matroska->num_levels--;
502
            return 1;
503
        }
504
    }
505
    return 0;
506
}
507

    
508
/*
509
 * Read: an "EBML number", which is defined as a variable-length
510
 * array of bytes. The first byte indicates the length by giving a
511
 * number of 0-bits followed by a one. The position of the first
512
 * "one" bit inside the first byte indicates the length of this
513
 * number.
514
 * Returns: number of bytes read, < 0 on error
515
 */
516
static int ebml_read_num(MatroskaDemuxContext *matroska, ByteIOContext *pb,
517
                         int max_size, uint64_t *number)
518
{
519
    int len_mask = 0x80, read = 1, n = 1;
520
    int64_t total = 0;
521

    
522
    /* The first byte tells us the length in bytes - get_byte() can normally
523
     * return 0, but since that's not a valid first ebmlID byte, we can
524
     * use it safely here to catch EOS. */
525
    if (!(total = get_byte(pb))) {
526
        /* we might encounter EOS here */
527
        if (!url_feof(pb)) {
528
            int64_t pos = url_ftell(pb);
529
            av_log(matroska->ctx, AV_LOG_ERROR,
530
                   "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
531
                   pos, pos);
532
        }
533
        return AVERROR(EIO); /* EOS or actual I/O error */
534
    }
535

    
536
    /* get the length of the EBML number */
537
    while (read <= max_size && !(total & len_mask)) {
538
        read++;
539
        len_mask >>= 1;
540
    }
541
    if (read > max_size) {
542
        int64_t pos = url_ftell(pb) - 1;
543
        av_log(matroska->ctx, AV_LOG_ERROR,
544
               "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
545
               (uint8_t) total, pos, pos);
546
        return AVERROR_INVALIDDATA;
547
    }
548

    
549
    /* read out length */
550
    total &= ~len_mask;
551
    while (n++ < read)
552
        total = (total << 8) | get_byte(pb);
553

    
554
    *number = total;
555

    
556
    return read;
557
}
558

    
559
/*
560
 * Read the next element as an unsigned int.
561
 * 0 is success, < 0 is failure.
562
 */
563
static int ebml_read_uint(ByteIOContext *pb, int size, uint64_t *num)
564
{
565
    int n = 0;
566

    
567
    if (size < 1 || size > 8)
568
        return AVERROR_INVALIDDATA;
569

    
570
    /* big-endian ordering; build up number */
571
    *num = 0;
572
    while (n++ < size)
573
        *num = (*num << 8) | get_byte(pb);
574

    
575
    return 0;
576
}
577

    
578
/*
579
 * Read the next element as a float.
580
 * 0 is success, < 0 is failure.
581
 */
582
static int ebml_read_float(ByteIOContext *pb, int size, double *num)
583
{
584
    if (size == 4) {
585
        *num= av_int2flt(get_be32(pb));
586
    } else if(size==8){
587
        *num= av_int2dbl(get_be64(pb));
588
    } else
589
        return AVERROR_INVALIDDATA;
590

    
591
    return 0;
592
}
593

    
594
/*
595
 * Read the next element as an ASCII string.
596
 * 0 is success, < 0 is failure.
597
 */
598
static int ebml_read_ascii(ByteIOContext *pb, int size, char **str)
599
{
600
    av_free(*str);
601
    /* EBML strings are usually not 0-terminated, so we allocate one
602
     * byte more, read the string and NULL-terminate it ourselves. */
603
    if (!(*str = av_malloc(size + 1)))
604
        return AVERROR(ENOMEM);
605
    if (get_buffer(pb, (uint8_t *) *str, size) != size) {
606
        av_free(*str);
607
        return AVERROR(EIO);
608
    }
609
    (*str)[size] = '\0';
610

    
611
    return 0;
612
}
613

    
614
/*
615
 * Read the next element as binary data.
616
 * 0 is success, < 0 is failure.
617
 */
618
static int ebml_read_binary(ByteIOContext *pb, int length, EbmlBin *bin)
619
{
620
    av_free(bin->data);
621
    if (!(bin->data = av_malloc(length)))
622
        return AVERROR(ENOMEM);
623

    
624
    bin->size = length;
625
    bin->pos  = url_ftell(pb);
626
    if (get_buffer(pb, bin->data, length) != length)
627
        return AVERROR(EIO);
628

    
629
    return 0;
630
}
631

    
632
/*
633
 * Read the next element, but only the header. The contents
634
 * are supposed to be sub-elements which can be read separately.
635
 * 0 is success, < 0 is failure.
636
 */
637
static int ebml_read_master(MatroskaDemuxContext *matroska, int length)
638
{
639
    ByteIOContext *pb = matroska->ctx->pb;
640
    MatroskaLevel *level;
641

    
642
    if (matroska->num_levels >= EBML_MAX_DEPTH) {
643
        av_log(matroska->ctx, AV_LOG_ERROR,
644
               "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
645
        return AVERROR(ENOSYS);
646
    }
647

    
648
    level = &matroska->levels[matroska->num_levels++];
649
    level->start = url_ftell(pb);
650
    level->length = length;
651

    
652
    return 0;
653
}
654

    
655
/*
656
 * Read signed/unsigned "EBML" numbers.
657
 * Return: number of bytes processed, < 0 on error
658
 */
659
static int matroska_ebmlnum_uint(MatroskaDemuxContext *matroska,
660
                                 uint8_t *data, uint32_t size, uint64_t *num)
661
{
662
    ByteIOContext pb;
663
    init_put_byte(&pb, data, size, 0, NULL, NULL, NULL, NULL);
664
    return ebml_read_num(matroska, &pb, 8, num);
665
}
666

    
667
/*
668
 * Same as above, but signed.
669
 */
670
static int matroska_ebmlnum_sint(MatroskaDemuxContext *matroska,
671
                                 uint8_t *data, uint32_t size, int64_t *num)
672
{
673
    uint64_t unum;
674
    int res;
675

    
676
    /* read as unsigned number first */
677
    if ((res = matroska_ebmlnum_uint(matroska, data, size, &unum)) < 0)
678
        return res;
679

    
680
    /* make signed (weird way) */
681
    *num = unum - ((1LL << (7*res - 1)) - 1);
682

    
683
    return res;
684
}
685

    
686
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
687
                           EbmlSyntax *syntax, void *data);
688

    
689
static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
690
                         uint32_t id, void *data)
691
{
692
    int i;
693
    for (i=0; syntax[i].id; i++)
694
        if (id == syntax[i].id)
695
            break;
696
    if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32)
697
        av_log(matroska->ctx, AV_LOG_INFO, "Unknown entry 0x%X\n", id);
698
    return ebml_parse_elem(matroska, &syntax[i], data);
699
}
700

    
701
static int ebml_parse(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
702
                      void *data)
703
{
704
    uint64_t id;
705
    int res = ebml_read_num(matroska, matroska->ctx->pb, 4, &id);
706
    id |= 1 << 7*res;
707
    return res < 0 ? res : ebml_parse_id(matroska, syntax, id, data);
708
}
709

    
710
static int ebml_parse_nest(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
711
                           void *data)
712
{
713
    int i, res = 0;
714

    
715
    for (i=0; syntax[i].id; i++)
716
        switch (syntax[i].type) {
717
        case EBML_UINT:
718
            *(uint64_t *)((char *)data+syntax[i].data_offset) = syntax[i].def.u;
719
            break;
720
        case EBML_FLOAT:
721
            *(double   *)((char *)data+syntax[i].data_offset) = syntax[i].def.f;
722
            break;
723
        case EBML_STR:
724
        case EBML_UTF8:
725
            *(char    **)((char *)data+syntax[i].data_offset) = av_strdup(syntax[i].def.s);
726
            break;
727
        }
728

    
729
    while (!res && !ebml_level_end(matroska))
730
        res = ebml_parse(matroska, syntax, data);
731

    
732
    return res;
733
}
734

    
735
static int ebml_parse_elem(MatroskaDemuxContext *matroska,
736
                           EbmlSyntax *syntax, void *data)
737
{
738
    ByteIOContext *pb = matroska->ctx->pb;
739
    uint32_t id = syntax->id;
740
    uint64_t length;
741
    int res;
742

    
743
    data = (char *)data + syntax->data_offset;
744
    if (syntax->list_elem_size) {
745
        EbmlList *list = data;
746
        list->elem = av_realloc(list->elem, (list->nb_elem+1)*syntax->list_elem_size);
747
        data = (char*)list->elem + list->nb_elem*syntax->list_elem_size;
748
        memset(data, 0, syntax->list_elem_size);
749
        list->nb_elem++;
750
    }
751

    
752
    if (syntax->type != EBML_PASS && syntax->type != EBML_STOP)
753
        if ((res = ebml_read_num(matroska, pb, 8, &length)) < 0)
754
            return res;
755

    
756
    switch (syntax->type) {
757
    case EBML_UINT:  res = ebml_read_uint  (pb, length, data);  break;
758
    case EBML_FLOAT: res = ebml_read_float (pb, length, data);  break;
759
    case EBML_STR:
760
    case EBML_UTF8:  res = ebml_read_ascii (pb, length, data);  break;
761
    case EBML_BIN:   res = ebml_read_binary(pb, length, data);  break;
762
    case EBML_NEST:  if ((res=ebml_read_master(matroska, length)) < 0)
763
                         return res;
764
                     if (id == MATROSKA_ID_SEGMENT)
765
                         matroska->segment_start = url_ftell(matroska->ctx->pb);
766
                     return ebml_parse_nest(matroska, syntax->def.n, data);
767
    case EBML_PASS:  return ebml_parse_id(matroska, syntax->def.n, id, data);
768
    case EBML_STOP:  *(int *)data = 1;      return 1;
769
    default:         return url_fseek(pb,length,SEEK_CUR)<0 ? AVERROR(EIO) : 0;
770
    }
771
    if (res == AVERROR_INVALIDDATA)
772
        av_log(matroska->ctx, AV_LOG_ERROR, "Invalid element\n");
773
    else if (res == AVERROR(EIO))
774
        av_log(matroska->ctx, AV_LOG_ERROR, "Read error\n");
775
    return res;
776
}
777

    
778
static void ebml_free(EbmlSyntax *syntax, void *data)
779
{
780
    int i, j;
781
    for (i=0; syntax[i].id; i++) {
782
        void *data_off = (char *)data + syntax[i].data_offset;
783
        switch (syntax[i].type) {
784
        case EBML_STR:
785
        case EBML_UTF8:  av_freep(data_off);                      break;
786
        case EBML_BIN:   av_freep(&((EbmlBin *)data_off)->data);  break;
787
        case EBML_NEST:
788
            if (syntax[i].list_elem_size) {
789
                EbmlList *list = data_off;
790
                char *ptr = list->elem;
791
                for (j=0; j<list->nb_elem; j++, ptr+=syntax[i].list_elem_size)
792
                    ebml_free(syntax[i].def.n, ptr);
793
                av_free(list->elem);
794
            } else
795
                ebml_free(syntax[i].def.n, data_off);
796
        default:  break;
797
        }
798
    }
799
}
800

    
801

    
802
/*
803
 * Autodetecting...
804
 */
805
static int matroska_probe(AVProbeData *p)
806
{
807
    uint64_t total = 0;
808
    int len_mask = 0x80, size = 1, n = 1;
809
    static const char probe_data[] = "matroska";
810

    
811
    /* EBML header? */
812
    if (AV_RB32(p->buf) != EBML_ID_HEADER)
813
        return 0;
814

    
815
    /* length of header */
816
    total = p->buf[4];
817
    while (size <= 8 && !(total & len_mask)) {
818
        size++;
819
        len_mask >>= 1;
820
    }
821
    if (size > 8)
822
      return 0;
823
    total &= (len_mask - 1);
824
    while (n < size)
825
        total = (total << 8) | p->buf[4 + n++];
826

    
827
    /* Does the probe data contain the whole header? */
828
    if (p->buf_size < 4 + size + total)
829
      return 0;
830

    
831
    /* The header must contain the document type 'matroska'. For now,
832
     * we don't parse the whole header but simply check for the
833
     * availability of that array of characters inside the header.
834
     * Not fully fool-proof, but good enough. */
835
    for (n = 4+size; n <= 4+size+total-(sizeof(probe_data)-1); n++)
836
        if (!memcmp(p->buf+n, probe_data, sizeof(probe_data)-1))
837
            return AVPROBE_SCORE_MAX;
838

    
839
    return 0;
840
}
841

    
842
static MatroskaTrack *matroska_find_track_by_num(MatroskaDemuxContext *matroska,
843
                                                 int num)
844
{
845
    MatroskaTrack *tracks = matroska->tracks.elem;
846
    int i;
847

    
848
    for (i=0; i < matroska->tracks.nb_elem; i++)
849
        if (tracks[i].num == num)
850
            return &tracks[i];
851

    
852
    av_log(matroska->ctx, AV_LOG_ERROR, "Invalid track number %d\n", num);
853
    return NULL;
854
}
855

    
856
static int matroska_decode_buffer(uint8_t** buf, int* buf_size,
857
                                  MatroskaTrack *track)
858
{
859
    MatroskaTrackEncoding *encodings = track->encodings.elem;
860
    uint8_t* data = *buf;
861
    int isize = *buf_size;
862
    uint8_t* pkt_data = NULL;
863
    int pkt_size = isize;
864
    int result = 0;
865
    int olen;
866

    
867
    switch (encodings[0].compression.algo) {
868
    case MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP:
869
        return encodings[0].compression.settings.size;
870
    case MATROSKA_TRACK_ENCODING_COMP_LZO:
871
        do {
872
            olen = pkt_size *= 3;
873
            pkt_data = av_realloc(pkt_data,
874
                                  pkt_size+LZO_OUTPUT_PADDING);
875
            result = lzo1x_decode(pkt_data, &olen, data, &isize);
876
        } while (result==LZO_OUTPUT_FULL && pkt_size<10000000);
877
        if (result)
878
            goto failed;
879
        pkt_size -= olen;
880
        break;
881
#ifdef CONFIG_ZLIB
882
    case MATROSKA_TRACK_ENCODING_COMP_ZLIB: {
883
        z_stream zstream = {0};
884
        if (inflateInit(&zstream) != Z_OK)
885
            return -1;
886
        zstream.next_in = data;
887
        zstream.avail_in = isize;
888
        do {
889
            pkt_size *= 3;
890
            pkt_data = av_realloc(pkt_data, pkt_size);
891
            zstream.avail_out = pkt_size - zstream.total_out;
892
            zstream.next_out = pkt_data + zstream.total_out;
893
            result = inflate(&zstream, Z_NO_FLUSH);
894
        } while (result==Z_OK && pkt_size<10000000);
895
        pkt_size = zstream.total_out;
896
        inflateEnd(&zstream);
897
        if (result != Z_STREAM_END)
898
            goto failed;
899
        break;
900
    }
901
#endif
902
#ifdef CONFIG_BZLIB
903
    case MATROSKA_TRACK_ENCODING_COMP_BZLIB: {
904
        bz_stream bzstream = {0};
905
        if (BZ2_bzDecompressInit(&bzstream, 0, 0) != BZ_OK)
906
            return -1;
907
        bzstream.next_in = data;
908
        bzstream.avail_in = isize;
909
        do {
910
            pkt_size *= 3;
911
            pkt_data = av_realloc(pkt_data, pkt_size);
912
            bzstream.avail_out = pkt_size - bzstream.total_out_lo32;
913
            bzstream.next_out = pkt_data + bzstream.total_out_lo32;
914
            result = BZ2_bzDecompress(&bzstream);
915
        } while (result==BZ_OK && pkt_size<10000000);
916
        pkt_size = bzstream.total_out_lo32;
917
        BZ2_bzDecompressEnd(&bzstream);
918
        if (result != BZ_STREAM_END)
919
            goto failed;
920
        break;
921
    }
922
#endif
923
    default:
924
        return -1;
925
    }
926

    
927
    *buf = pkt_data;
928
    *buf_size = pkt_size;
929
    return 0;
930
 failed:
931
    av_free(pkt_data);
932
    return -1;
933
}
934

    
935
static void matroska_fix_ass_packet(MatroskaDemuxContext *matroska,
936
                                    AVPacket *pkt, uint64_t display_duration)
937
{
938
    char *line, *layer, *ptr = pkt->data, *end = ptr+pkt->size;
939
    for (; *ptr!=',' && ptr<end-1; ptr++);
940
    if (*ptr == ',')
941
        layer = ++ptr;
942
    for (; *ptr!=',' && ptr<end-1; ptr++);
943
    if (*ptr == ',') {
944
        int64_t end_pts = pkt->pts + display_duration;
945
        int sc = matroska->time_scale * pkt->pts / 10000000;
946
        int ec = matroska->time_scale * end_pts  / 10000000;
947
        int sh, sm, ss, eh, em, es, len;
948
        sh = sc/360000;  sc -= 360000*sh;
949
        sm = sc/  6000;  sc -=   6000*sm;
950
        ss = sc/   100;  sc -=    100*ss;
951
        eh = ec/360000;  ec -= 360000*eh;
952
        em = ec/  6000;  ec -=   6000*em;
953
        es = ec/   100;  ec -=    100*es;
954
        *ptr++ = '\0';
955
        len = 50 + end-ptr + FF_INPUT_BUFFER_PADDING_SIZE;
956
        if (!(line = av_malloc(len)))
957
            return;
958
        snprintf(line,len,"Dialogue: %s,%d:%02d:%02d.%02d,%d:%02d:%02d.%02d,%s\r\n",
959
                 layer, sh, sm, ss, sc, eh, em, es, ec, ptr);
960
        av_free(pkt->data);
961
        pkt->data = line;
962
        pkt->size = strlen(line);
963
    }
964
}
965

    
966
static void matroska_merge_packets(AVPacket *out, AVPacket *in)
967
{
968
    out->data = av_realloc(out->data, out->size+in->size);
969
    memcpy(out->data+out->size, in->data, in->size);
970
    out->size += in->size;
971
    av_destruct_packet(in);
972
    av_free(in);
973
}
974

    
975
static void matroska_convert_tags(AVFormatContext *s, EbmlList *list)
976
{
977
    MatroskaTag *tags = list->elem;
978
    int i, j;
979

    
980
    for (i=0; i < list->nb_elem; i++) {
981
        for (j=0; j < FF_ARRAY_ELEMS(metadata); j++){
982
            if (!strcmp(tags[i].name, metadata[j].name)) {
983
                int *ptr = (int *)((char *)s + metadata[j].offset);
984
                if (*ptr)  continue;
985
                if (metadata[j].size > sizeof(int))
986
                    av_strlcpy((char *)ptr, tags[i].string, metadata[j].size);
987
                else
988
                    *ptr = atoi(tags[i].string);
989
            }
990
        }
991
        if (tags[i].sub.nb_elem)
992
            matroska_convert_tags(s, &tags[i].sub);
993
    }
994
}
995

    
996
static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
997
{
998
    EbmlList *seekhead_list = &matroska->seekhead;
999
    MatroskaSeekhead *seekhead = seekhead_list->elem;
1000
    uint32_t level_up = matroska->level_up;
1001
    int64_t before_pos = url_ftell(matroska->ctx->pb);
1002
    MatroskaLevel level;
1003
    int i;
1004

    
1005
    for (i=0; i<seekhead_list->nb_elem; i++) {
1006
        int64_t offset = seekhead[i].pos + matroska->segment_start;
1007

    
1008
        if (seekhead[i].pos <= before_pos
1009
            || seekhead[i].id == MATROSKA_ID_SEEKHEAD
1010
            || seekhead[i].id == MATROSKA_ID_CLUSTER)
1011
            continue;
1012

    
1013
        /* seek */
1014
        if (url_fseek(matroska->ctx->pb, offset, SEEK_SET) != offset)
1015
            continue;
1016

    
1017
        /* We don't want to lose our seekhead level, so we add
1018
         * a dummy. This is a crude hack. */
1019
        if (matroska->num_levels == EBML_MAX_DEPTH) {
1020
            av_log(matroska->ctx, AV_LOG_INFO,
1021
                   "Max EBML element depth (%d) reached, "
1022
                   "cannot parse further.\n", EBML_MAX_DEPTH);
1023
            break;
1024
        }
1025

    
1026
        level.start = 0;
1027
        level.length = (uint64_t)-1;
1028
        matroska->levels[matroska->num_levels] = level;
1029
        matroska->num_levels++;
1030

    
1031
        ebml_parse(matroska, matroska_segment, matroska);
1032

    
1033
        /* remove dummy level */
1034
        while (matroska->num_levels) {
1035
            uint64_t length = matroska->levels[--matroska->num_levels].length;
1036
            if (length == (uint64_t)-1)
1037
                break;
1038
        }
1039
    }
1040

    
1041
    /* seek back */
1042
    url_fseek(matroska->ctx->pb, before_pos, SEEK_SET);
1043
    matroska->level_up = level_up;
1044
}
1045

    
1046
static int matroska_aac_profile(char *codec_id)
1047
{
1048
    static const char * const aac_profiles[] = { "MAIN", "LC", "SSR" };
1049
    int profile;
1050

    
1051
    for (profile=0; profile<FF_ARRAY_ELEMS(aac_profiles); profile++)
1052
        if (strstr(codec_id, aac_profiles[profile]))
1053
            break;
1054
    return profile + 1;
1055
}
1056

    
1057
static int matroska_aac_sri(int samplerate)
1058
{
1059
    int sri;
1060

    
1061
    for (sri=0; sri<FF_ARRAY_ELEMS(ff_mpeg4audio_sample_rates); sri++)
1062
        if (ff_mpeg4audio_sample_rates[sri] == samplerate)
1063
            break;
1064
    return sri;
1065
}
1066

    
1067
static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
1068
{
1069
    MatroskaDemuxContext *matroska = s->priv_data;
1070
    EbmlList *attachements_list = &matroska->attachments;
1071
    MatroskaAttachement *attachements;
1072
    EbmlList *chapters_list = &matroska->chapters;
1073
    MatroskaChapter *chapters;
1074
    MatroskaTrack *tracks;
1075
    EbmlList *index_list;
1076
    MatroskaIndex *index;
1077
    int index_scale = 1;
1078
    Ebml ebml = { 0 };
1079
    AVStream *st;
1080
    int i, j;
1081

    
1082
    matroska->ctx = s;
1083

    
1084
    /* First read the EBML header. */
1085
    if (ebml_parse(matroska, ebml_syntax, &ebml)
1086
        || ebml.version > EBML_VERSION       || ebml.max_size > sizeof(uint64_t)
1087
        || ebml.id_length > sizeof(uint32_t) || strcmp(ebml.doctype, "matroska")
1088
        || ebml.doctype_version > 2) {
1089
        av_log(matroska->ctx, AV_LOG_ERROR,
1090
               "EBML header using unsupported features\n"
1091
               "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",
1092
               ebml.version, ebml.doctype, ebml.doctype_version);
1093
        return AVERROR_NOFMT;
1094
    }
1095
    ebml_free(ebml_syntax, &ebml);
1096

    
1097
    /* The next thing is a segment. */
1098
    if (ebml_parse(matroska, matroska_segments, matroska) < 0)
1099
        return -1;
1100
    matroska_execute_seekhead(matroska);
1101

    
1102
    if (matroska->duration)
1103
        matroska->ctx->duration = matroska->duration * matroska->time_scale
1104
                                  * 1000 / AV_TIME_BASE;
1105
    if (matroska->title)
1106
        strncpy(matroska->ctx->title, matroska->title,
1107
                sizeof(matroska->ctx->title)-1);
1108
    matroska_convert_tags(s, &matroska->tags);
1109

    
1110
    tracks = matroska->tracks.elem;
1111
    for (i=0; i < matroska->tracks.nb_elem; i++) {
1112
        MatroskaTrack *track = &tracks[i];
1113
        enum CodecID codec_id = CODEC_ID_NONE;
1114
        EbmlList *encodings_list = &tracks->encodings;
1115
        MatroskaTrackEncoding *encodings = encodings_list->elem;
1116
        uint8_t *extradata = NULL;
1117
        int extradata_size = 0;
1118
        int extradata_offset = 0;
1119

    
1120
        /* Apply some sanity checks. */
1121
        if (track->type != MATROSKA_TRACK_TYPE_VIDEO &&
1122
            track->type != MATROSKA_TRACK_TYPE_AUDIO &&
1123
            track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1124
            av_log(matroska->ctx, AV_LOG_INFO,
1125
                   "Unknown or unsupported track type %"PRIu64"\n",
1126
                   track->type);
1127
            continue;
1128
        }
1129
        if (track->codec_id == NULL)
1130
            continue;
1131

    
1132
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1133
            if (!track->default_duration)
1134
                track->default_duration = 1000000000/track->video.frame_rate;
1135
            if (!track->video.display_width)
1136
                track->video.display_width = track->video.pixel_width;
1137
            if (!track->video.display_height)
1138
                track->video.display_height = track->video.pixel_height;
1139
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1140
            if (!track->audio.out_samplerate)
1141
                track->audio.out_samplerate = track->audio.samplerate;
1142
        }
1143
        if (encodings_list->nb_elem > 1) {
1144
            av_log(matroska->ctx, AV_LOG_ERROR,
1145
                   "Multiple combined encodings no supported");
1146
        } else if (encodings_list->nb_elem == 1) {
1147
            if (encodings[0].type ||
1148
                (encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_HEADERSTRIP &&
1149
#ifdef CONFIG_ZLIB
1150
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_ZLIB &&
1151
#endif
1152
#ifdef CONFIG_BZLIB
1153
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_BZLIB &&
1154
#endif
1155
                 encodings[0].compression.algo != MATROSKA_TRACK_ENCODING_COMP_LZO)) {
1156
                encodings[0].scope = 0;
1157
                av_log(matroska->ctx, AV_LOG_ERROR,
1158
                       "Unsupported encoding type");
1159
            } else if (track->codec_priv.size && encodings[0].scope&2) {
1160
                uint8_t *codec_priv = track->codec_priv.data;
1161
                int offset = matroska_decode_buffer(&track->codec_priv.data,
1162
                                                    &track->codec_priv.size,
1163
                                                    track);
1164
                if (offset < 0) {
1165
                    track->codec_priv.data = NULL;
1166
                    track->codec_priv.size = 0;
1167
                    av_log(matroska->ctx, AV_LOG_ERROR,
1168
                           "Failed to decode codec private data\n");
1169
                } else if (offset > 0) {
1170
                    track->codec_priv.data = av_malloc(track->codec_priv.size + offset);
1171
                    memcpy(track->codec_priv.data,
1172
                           encodings[0].compression.settings.data, offset);
1173
                    memcpy(track->codec_priv.data+offset, codec_priv,
1174
                           track->codec_priv.size);
1175
                    track->codec_priv.size += offset;
1176
                }
1177
                if (codec_priv != track->codec_priv.data)
1178
                    av_free(codec_priv);
1179
            }
1180
        }
1181

    
1182
        for(j=0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++){
1183
            if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
1184
                        strlen(ff_mkv_codec_tags[j].str))){
1185
                codec_id= ff_mkv_codec_tags[j].id;
1186
                break;
1187
            }
1188
        }
1189

    
1190
        st = track->stream = av_new_stream(s, 0);
1191
        if (st == NULL)
1192
            return AVERROR(ENOMEM);
1193

    
1194
        if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
1195
            && track->codec_priv.size >= 40
1196
            && track->codec_priv.data != NULL) {
1197
            track->video.fourcc = AV_RL32(track->codec_priv.data + 16);
1198
            codec_id = codec_get_id(codec_bmp_tags, track->video.fourcc);
1199
        } else if (!strcmp(track->codec_id, "A_MS/ACM")
1200
                   && track->codec_priv.size >= 18
1201
                   && track->codec_priv.data != NULL) {
1202
            uint16_t tag = AV_RL16(track->codec_priv.data);
1203
            codec_id = codec_get_id(codec_wav_tags, tag);
1204
        } else if (!strcmp(track->codec_id, "V_QUICKTIME")
1205
                   && (track->codec_priv.size >= 86)
1206
                   && (track->codec_priv.data != NULL)) {
1207
            track->video.fourcc = AV_RL32(track->codec_priv.data);
1208
            codec_id=codec_get_id(codec_movvideo_tags, track->video.fourcc);
1209
        } else if (codec_id == CODEC_ID_PCM_S16BE) {
1210
            switch (track->audio.bitdepth) {
1211
            case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1212
            case 24:  codec_id = CODEC_ID_PCM_S24BE;  break;
1213
            case 32:  codec_id = CODEC_ID_PCM_S32BE;  break;
1214
            }
1215
        } else if (codec_id == CODEC_ID_PCM_S16LE) {
1216
            switch (track->audio.bitdepth) {
1217
            case  8:  codec_id = CODEC_ID_PCM_U8;     break;
1218
            case 24:  codec_id = CODEC_ID_PCM_S24LE;  break;
1219
            case 32:  codec_id = CODEC_ID_PCM_S32LE;  break;
1220
            }
1221
        } else if (codec_id==CODEC_ID_PCM_F32LE && track->audio.bitdepth==64) {
1222
            codec_id = CODEC_ID_PCM_F64LE;
1223
        } else if (codec_id == CODEC_ID_AAC && !track->codec_priv.size) {
1224
            int profile = matroska_aac_profile(track->codec_id);
1225
            int sri = matroska_aac_sri(track->audio.samplerate);
1226
            extradata = av_malloc(5);
1227
            if (extradata == NULL)
1228
                return AVERROR(ENOMEM);
1229
            extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
1230
            extradata[1] = ((sri&0x01) << 7) | (track->audio.channels<<3);
1231
            if (strstr(track->codec_id, "SBR")) {
1232
                sri = matroska_aac_sri(track->audio.out_samplerate);
1233
                extradata[2] = 0x56;
1234
                extradata[3] = 0xE5;
1235
                extradata[4] = 0x80 | (sri<<3);
1236
                extradata_size = 5;
1237
            } else
1238
                extradata_size = 2;
1239
        } else if (codec_id == CODEC_ID_TTA) {
1240
            ByteIOContext b;
1241
            extradata_size = 30;
1242
            extradata = av_mallocz(extradata_size);
1243
            if (extradata == NULL)
1244
                return AVERROR(ENOMEM);
1245
            init_put_byte(&b, extradata, extradata_size, 1,
1246
                          NULL, NULL, NULL, NULL);
1247
            put_buffer(&b, "TTA1", 4);
1248
            put_le16(&b, 1);
1249
            put_le16(&b, track->audio.channels);
1250
            put_le16(&b, track->audio.bitdepth);
1251
            put_le32(&b, track->audio.out_samplerate);
1252
            put_le32(&b, matroska->ctx->duration * track->audio.out_samplerate);
1253
        } else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
1254
                   codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
1255
            extradata_offset = 26;
1256
            track->codec_priv.size -= extradata_offset;
1257
        } else if (codec_id == CODEC_ID_RA_144) {
1258
            track->audio.out_samplerate = 8000;
1259
            track->audio.channels = 1;
1260
        } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
1261
                   codec_id == CODEC_ID_ATRAC3) {
1262
            ByteIOContext b;
1263

    
1264
            init_put_byte(&b, track->codec_priv.data,track->codec_priv.size,
1265
                          0, NULL, NULL, NULL, NULL);
1266
            url_fskip(&b, 24);
1267
            track->audio.coded_framesize = get_be32(&b);
1268
            url_fskip(&b, 12);
1269
            track->audio.sub_packet_h    = get_be16(&b);
1270
            track->audio.frame_size      = get_be16(&b);
1271
            track->audio.sub_packet_size = get_be16(&b);
1272
            track->audio.buf = av_malloc(track->audio.frame_size * track->audio.sub_packet_h);
1273
            if (codec_id == CODEC_ID_RA_288) {
1274
                st->codec->block_align = track->audio.coded_framesize;
1275
                track->codec_priv.size = 0;
1276
            } else {
1277
                st->codec->block_align = track->audio.sub_packet_size;
1278
                extradata_offset = 78;
1279
                track->codec_priv.size -= extradata_offset;
1280
            }
1281
        }
1282

    
1283
        if (codec_id == CODEC_ID_NONE)
1284
            av_log(matroska->ctx, AV_LOG_INFO,
1285
                   "Unknown/unsupported CodecID %s.\n", track->codec_id);
1286

    
1287
        if (track->time_scale < 0.01)
1288
            track->time_scale = 1.0;
1289
        av_set_pts_info(st, 64, matroska->time_scale*track->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
1290

    
1291
        st->codec->codec_id = codec_id;
1292
        st->start_time = 0;
1293
        if (strcmp(track->language, "und"))
1294
            av_strlcpy(st->language, track->language, 4);
1295

    
1296
        if (track->flag_default)
1297
            st->disposition |= AV_DISPOSITION_DEFAULT;
1298

    
1299
        if (track->default_duration)
1300
            av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
1301
                      track->default_duration, 1000000000, 30000);
1302

    
1303
        if(extradata){
1304
            st->codec->extradata = extradata;
1305
            st->codec->extradata_size = extradata_size;
1306
        } else if(track->codec_priv.data && track->codec_priv.size > 0){
1307
            st->codec->extradata = av_mallocz(track->codec_priv.size +
1308
                                              FF_INPUT_BUFFER_PADDING_SIZE);
1309
            if(st->codec->extradata == NULL)
1310
                return AVERROR(ENOMEM);
1311
            st->codec->extradata_size = track->codec_priv.size;
1312
            memcpy(st->codec->extradata,
1313
                   track->codec_priv.data + extradata_offset,
1314
                   track->codec_priv.size);
1315
        }
1316

    
1317
        if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
1318
            st->codec->codec_type = CODEC_TYPE_VIDEO;
1319
            st->codec->codec_tag  = track->video.fourcc;
1320
            st->codec->width  = track->video.pixel_width;
1321
            st->codec->height = track->video.pixel_height;
1322
            av_reduce(&st->sample_aspect_ratio.num,
1323
                      &st->sample_aspect_ratio.den,
1324
                      st->codec->height * track->video.display_width,
1325
                      st->codec-> width * track->video.display_height,
1326
                      255);
1327
            st->need_parsing = AVSTREAM_PARSE_HEADERS;
1328
        } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
1329
            st->codec->codec_type = CODEC_TYPE_AUDIO;
1330
            st->codec->sample_rate = track->audio.out_samplerate;
1331
            st->codec->channels = track->audio.channels;
1332
        } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
1333
            st->codec->codec_type = CODEC_TYPE_SUBTITLE;
1334
        }
1335
    }
1336

    
1337
    attachements = attachements_list->elem;
1338
    for (j=0; j<attachements_list->nb_elem; j++) {
1339
        if (!(attachements[j].filename && attachements[j].mime &&
1340
              attachements[j].bin.data && attachements[j].bin.size > 0)) {
1341
            av_log(matroska->ctx, AV_LOG_ERROR, "incomplete attachment\n");
1342
        } else {
1343
            AVStream *st = av_new_stream(s, 0);
1344
            if (st == NULL)
1345
                break;
1346
            st->filename          = av_strdup(attachements[j].filename);
1347
            st->codec->codec_id = CODEC_ID_NONE;
1348
            st->codec->codec_type = CODEC_TYPE_ATTACHMENT;
1349
            st->codec->extradata  = av_malloc(attachements[j].bin.size);
1350
            if(st->codec->extradata == NULL)
1351
                break;
1352
            st->codec->extradata_size = attachements[j].bin.size;
1353
            memcpy(st->codec->extradata, attachements[j].bin.data, attachements[j].bin.size);
1354

    
1355
            for (i=0; ff_mkv_mime_tags[i].id != CODEC_ID_NONE; i++) {
1356
                if (!strncmp(ff_mkv_mime_tags[i].str, attachements[j].mime,
1357
                             strlen(ff_mkv_mime_tags[i].str))) {
1358
                    st->codec->codec_id = ff_mkv_mime_tags[i].id;
1359
                    break;
1360
                }
1361
            }
1362
        }
1363
    }
1364

    
1365
    chapters = chapters_list->elem;
1366
    for (i=0; i<chapters_list->nb_elem; i++)
1367
        if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid)
1368
            ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
1369
                           chapters[i].start, chapters[i].end,
1370
                           chapters[i].title);
1371

    
1372
    index_list = &matroska->index;
1373
    index = index_list->elem;
1374
    if (index_list->nb_elem
1375
        && index[0].time > 100000000000000/matroska->time_scale) {
1376
        av_log(matroska->ctx, AV_LOG_WARNING, "Working around broken index.\n");
1377
        index_scale = matroska->time_scale;
1378
    }
1379
    for (i=0; i<index_list->nb_elem; i++) {
1380
        EbmlList *pos_list = &index[i].pos;
1381
        MatroskaIndexPos *pos = pos_list->elem;
1382
        for (j=0; j<pos_list->nb_elem; j++) {
1383
            MatroskaTrack *track = matroska_find_track_by_num(matroska,
1384
                                                              pos[j].track);
1385
            if (track && track->stream)
1386
                av_add_index_entry(track->stream,
1387
                                   pos[j].pos + matroska->segment_start,
1388
                                   index[i].time/index_scale, 0, 0,
1389
                                   AVINDEX_KEYFRAME);
1390
        }
1391
    }
1392

    
1393
    return 0;
1394
}
1395

    
1396
/*
1397
 * Put one packet in an application-supplied AVPacket struct.
1398
 * Returns 0 on success or -1 on failure.
1399
 */
1400
static int matroska_deliver_packet(MatroskaDemuxContext *matroska,
1401
                                   AVPacket *pkt)
1402
{
1403
    if (matroska->num_packets > 0) {
1404
        memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
1405
        av_free(matroska->packets[0]);
1406
        if (matroska->num_packets > 1) {
1407
            memmove(&matroska->packets[0], &matroska->packets[1],
1408
                    (matroska->num_packets - 1) * sizeof(AVPacket *));
1409
            matroska->packets =
1410
                av_realloc(matroska->packets, (matroska->num_packets - 1) *
1411
                           sizeof(AVPacket *));
1412
        } else {
1413
            av_freep(&matroska->packets);
1414
        }
1415
        matroska->num_packets--;
1416
        return 0;
1417
    }
1418

    
1419
    return -1;
1420
}
1421

    
1422
/*
1423
 * Free all packets in our internal queue.
1424
 */
1425
static void matroska_clear_queue(MatroskaDemuxContext *matroska)
1426
{
1427
    if (matroska->packets) {
1428
        int n;
1429
        for (n = 0; n < matroska->num_packets; n++) {
1430
            av_free_packet(matroska->packets[n]);
1431
            av_free(matroska->packets[n]);
1432
        }
1433
        av_freep(&matroska->packets);
1434
        matroska->num_packets = 0;
1435
    }
1436
}
1437

    
1438
static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
1439
                                int size, int64_t pos, uint64_t cluster_time,
1440
                                uint64_t duration, int is_keyframe,
1441
                                int64_t cluster_pos)
1442
{
1443
    uint64_t timecode = AV_NOPTS_VALUE;
1444
    MatroskaTrack *track;
1445
    int res = 0;
1446
    AVStream *st;
1447
    AVPacket *pkt;
1448
    int16_t block_time;
1449
    uint32_t *lace_size = NULL;
1450
    int n, flags, laces = 0;
1451
    uint64_t num;
1452

    
1453
    if ((n = matroska_ebmlnum_uint(matroska, data, size, &num)) < 0) {
1454
        av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
1455
        return res;
1456
    }
1457
    data += n;
1458
    size -= n;
1459

    
1460
    track = matroska_find_track_by_num(matroska, num);
1461
    if (size <= 3 || !track || !track->stream) {
1462
        av_log(matroska->ctx, AV_LOG_INFO,
1463
               "Invalid stream %"PRIu64" or size %u\n", num, size);
1464
        return res;
1465
    }
1466
    st = track->stream;
1467
    if (st->discard >= AVDISCARD_ALL)
1468
        return res;
1469
    if (duration == AV_NOPTS_VALUE)
1470
        duration = track->default_duration / matroska->time_scale;
1471

    
1472
    block_time = AV_RB16(data);
1473
    data += 2;
1474
    flags = *data++;
1475
    size -= 3;
1476
    if (is_keyframe == -1)
1477
        is_keyframe = flags & 0x80 ? PKT_FLAG_KEY : 0;
1478

    
1479
    if (cluster_time != (uint64_t)-1
1480
        && (block_time >= 0 || cluster_time >= -block_time)) {
1481
        timecode = cluster_time + block_time;
1482
        if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
1483
            && timecode < track->end_timecode)
1484
            is_keyframe = 0;  /* overlapping subtitles are not key frame */
1485
        if (is_keyframe)
1486
            av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
1487
        track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
1488
    }
1489

    
1490
    if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
1491
        if (!is_keyframe || timecode < matroska->skip_to_timecode)
1492
            return res;
1493
        matroska->skip_to_keyframe = 0;
1494
    }
1495

    
1496
    switch ((flags & 0x06) >> 1) {
1497
        case 0x0: /* no lacing */
1498
            laces = 1;
1499
            lace_size = av_mallocz(sizeof(int));
1500
            lace_size[0] = size;
1501
            break;
1502

    
1503
        case 0x1: /* Xiph lacing */
1504
        case 0x2: /* fixed-size lacing */
1505
        case 0x3: /* EBML lacing */
1506
            assert(size>0); // size <=3 is checked before size-=3 above
1507
            laces = (*data) + 1;
1508
            data += 1;
1509
            size -= 1;
1510
            lace_size = av_mallocz(laces * sizeof(int));
1511

    
1512
            switch ((flags & 0x06) >> 1) {
1513
                case 0x1: /* Xiph lacing */ {
1514
                    uint8_t temp;
1515
                    uint32_t total = 0;
1516
                    for (n = 0; res == 0 && n < laces - 1; n++) {
1517
                        while (1) {
1518
                            if (size == 0) {
1519
                                res = -1;
1520
                                break;
1521
                            }
1522
                            temp = *data;
1523
                            lace_size[n] += temp;
1524
                            data += 1;
1525
                            size -= 1;
1526
                            if (temp != 0xff)
1527
                                break;
1528
                        }
1529
                        total += lace_size[n];
1530
                    }
1531
                    lace_size[n] = size - total;
1532
                    break;
1533
                }
1534

    
1535
                case 0x2: /* fixed-size lacing */
1536
                    for (n = 0; n < laces; n++)
1537
                        lace_size[n] = size / laces;
1538
                    break;
1539

    
1540
                case 0x3: /* EBML lacing */ {
1541
                    uint32_t total;
1542
                    n = matroska_ebmlnum_uint(matroska, data, size, &num);
1543
                    if (n < 0) {
1544
                        av_log(matroska->ctx, AV_LOG_INFO,
1545
                               "EBML block data error\n");
1546
                        break;
1547
                    }
1548
                    data += n;
1549
                    size -= n;
1550
                    total = lace_size[0] = num;
1551
                    for (n = 1; res == 0 && n < laces - 1; n++) {
1552
                        int64_t snum;
1553
                        int r;
1554
                        r = matroska_ebmlnum_sint(matroska, data, size, &snum);
1555
                        if (r < 0) {
1556
                            av_log(matroska->ctx, AV_LOG_INFO,
1557
                                   "EBML block data error\n");
1558
                            break;
1559
                        }
1560
                        data += r;
1561
                        size -= r;
1562
                        lace_size[n] = lace_size[n - 1] + snum;
1563
                        total += lace_size[n];
1564
                    }
1565
                    lace_size[n] = size - total;
1566
                    break;
1567
                }
1568
            }
1569
            break;
1570
    }
1571

    
1572
    if (res == 0) {
1573
        for (n = 0; n < laces; n++) {
1574
            if (st->codec->codec_id == CODEC_ID_RA_288 ||
1575
                st->codec->codec_id == CODEC_ID_COOK ||
1576
                st->codec->codec_id == CODEC_ID_ATRAC3) {
1577
                int a = st->codec->block_align;
1578
                int sps = track->audio.sub_packet_size;
1579
                int cfs = track->audio.coded_framesize;
1580
                int h = track->audio.sub_packet_h;
1581
                int y = track->audio.sub_packet_cnt;
1582
                int w = track->audio.frame_size;
1583
                int x;
1584

    
1585
                if (!track->audio.pkt_cnt) {
1586
                    if (st->codec->codec_id == CODEC_ID_RA_288)
1587
                        for (x=0; x<h/2; x++)
1588
                            memcpy(track->audio.buf+x*2*w+y*cfs,
1589
                                   data+x*cfs, cfs);
1590
                    else
1591
                        for (x=0; x<w/sps; x++)
1592
                            memcpy(track->audio.buf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), data+x*sps, sps);
1593

    
1594
                    if (++track->audio.sub_packet_cnt >= h) {
1595
                        track->audio.sub_packet_cnt = 0;
1596
                        track->audio.pkt_cnt = h*w / a;
1597
                    }
1598
                }
1599
                while (track->audio.pkt_cnt) {
1600
                    pkt = av_mallocz(sizeof(AVPacket));
1601
                    av_new_packet(pkt, a);
1602
                    memcpy(pkt->data, track->audio.buf
1603
                           + a * (h*w / a - track->audio.pkt_cnt--), a);
1604
                    pkt->pos = pos;
1605
                    pkt->stream_index = st->index;
1606
                    dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1607
                }
1608
            } else {
1609
                MatroskaTrackEncoding *encodings = track->encodings.elem;
1610
                int offset = 0, pkt_size = lace_size[n];
1611
                uint8_t *pkt_data = data;
1612

    
1613
                if (encodings && encodings->scope & 1) {
1614
                    offset = matroska_decode_buffer(&pkt_data,&pkt_size, track);
1615
                    if (offset < 0)
1616
                        continue;
1617
                }
1618

    
1619
                pkt = av_mallocz(sizeof(AVPacket));
1620
                /* XXX: prevent data copy... */
1621
                if (av_new_packet(pkt, pkt_size+offset) < 0) {
1622
                    av_free(pkt);
1623
                    res = AVERROR(ENOMEM);
1624
                    n = laces-1;
1625
                    break;
1626
                }
1627
                if (offset)
1628
                    memcpy (pkt->data, encodings->compression.settings.data, offset);
1629
                memcpy (pkt->data+offset, pkt_data, pkt_size);
1630

    
1631
                if (pkt_data != data)
1632
                    av_free(pkt_data);
1633

    
1634
                if (n == 0)
1635
                    pkt->flags = is_keyframe;
1636
                pkt->stream_index = st->index;
1637

    
1638
                pkt->pts = timecode;
1639
                pkt->pos = pos;
1640
                if (st->codec->codec_id == CODEC_ID_TEXT)
1641
                    pkt->convergence_duration = duration;
1642
                else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
1643
                    pkt->duration = duration;
1644

    
1645
                if (st->codec->codec_id == CODEC_ID_SSA)
1646
                    matroska_fix_ass_packet(matroska, pkt, duration);
1647

    
1648
                if (matroska->prev_pkt &&
1649
                    timecode != AV_NOPTS_VALUE &&
1650
                    matroska->prev_pkt->pts == timecode &&
1651
                    matroska->prev_pkt->stream_index == st->index)
1652
                    matroska_merge_packets(matroska->prev_pkt, pkt);
1653
                else {
1654
                    dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
1655
                    matroska->prev_pkt = pkt;
1656
                }
1657
            }
1658

    
1659
            if (timecode != AV_NOPTS_VALUE)
1660
                timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
1661
            data += lace_size[n];
1662
        }
1663
    }
1664

    
1665
    av_free(lace_size);
1666
    return res;
1667
}
1668

    
1669
static int matroska_parse_cluster(MatroskaDemuxContext *matroska)
1670
{
1671
    MatroskaCluster cluster = { 0 };
1672
    EbmlList *blocks_list;
1673
    MatroskaBlock *blocks;
1674
    int i, res;
1675
    int64_t pos = url_ftell(matroska->ctx->pb);
1676
    matroska->prev_pkt = NULL;
1677
    if (matroska->has_cluster_id){
1678
        /* For the first cluster we parse, its ID was already read as
1679
           part of matroska_read_header(), so don't read it again */
1680
        res = ebml_parse_id(matroska, matroska_clusters,
1681
                            MATROSKA_ID_CLUSTER, &cluster);
1682
        pos -= 4;  /* sizeof the ID which was already read */
1683
        matroska->has_cluster_id = 0;
1684
    } else
1685
        res = ebml_parse(matroska, matroska_clusters, &cluster);
1686
    blocks_list = &cluster.blocks;
1687
    blocks = blocks_list->elem;
1688
    for (i=0; i<blocks_list->nb_elem; i++)
1689
        if (blocks[i].bin.size > 0)
1690
            res=matroska_parse_block(matroska,
1691
                                     blocks[i].bin.data, blocks[i].bin.size,
1692
                                     blocks[i].bin.pos,  cluster.timecode,
1693
                                     blocks[i].duration, !blocks[i].reference,
1694
                                     pos);
1695
    ebml_free(matroska_cluster, &cluster);
1696
    if (res < 0)  matroska->done = 1;
1697
    return res;
1698
}
1699

    
1700
static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
1701
{
1702
    MatroskaDemuxContext *matroska = s->priv_data;
1703

    
1704
    while (matroska_deliver_packet(matroska, pkt)) {
1705
        if (matroska->done)
1706
            return AVERROR(EIO);
1707
        matroska_parse_cluster(matroska);
1708
    }
1709

    
1710
    return 0;
1711
}
1712

    
1713
static int matroska_read_seek(AVFormatContext *s, int stream_index,
1714
                              int64_t timestamp, int flags)
1715
{
1716
    MatroskaDemuxContext *matroska = s->priv_data;
1717
    MatroskaTrack *tracks = matroska->tracks.elem;
1718
    AVStream *st = s->streams[stream_index];
1719
    int i, index, index_sub, index_min;
1720

    
1721
    if (!st->nb_index_entries)
1722
        return 0;
1723
    timestamp = FFMAX(timestamp, st->index_entries[0].timestamp);
1724

    
1725
    if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1726
        url_fseek(s->pb, st->index_entries[st->nb_index_entries-1].pos, SEEK_SET);
1727
        while ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
1728
            matroska_clear_queue(matroska);
1729
            if (matroska_parse_cluster(matroska) < 0)
1730
                break;
1731
        }
1732
    }
1733

    
1734
    matroska_clear_queue(matroska);
1735
    if (index < 0)
1736
        return 0;
1737

    
1738
    index_min = index;
1739
    for (i=0; i < matroska->tracks.nb_elem; i++) {
1740
        tracks[i].end_timecode = 0;
1741
        if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
1742
            && !tracks[i].stream->discard != AVDISCARD_ALL) {
1743
            index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
1744
            if (index_sub >= 0
1745
                && st->index_entries[index_sub].pos < st->index_entries[index_min].pos
1746
                && st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
1747
                index_min = index_sub;
1748
        }
1749
    }
1750

    
1751
    url_fseek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
1752
    matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
1753
    matroska->skip_to_timecode = st->index_entries[index].timestamp;
1754
    matroska->done = 0;
1755
    av_update_cur_dts(s, st, st->index_entries[index].timestamp);
1756
    return 0;
1757
}
1758

    
1759
static int matroska_read_close(AVFormatContext *s)
1760
{
1761
    MatroskaDemuxContext *matroska = s->priv_data;
1762
    MatroskaTrack *tracks = matroska->tracks.elem;
1763
    int n;
1764

    
1765
    matroska_clear_queue(matroska);
1766

    
1767
    for (n=0; n < matroska->tracks.nb_elem; n++)
1768
        if (tracks[n].type == MATROSKA_TRACK_TYPE_AUDIO)
1769
            av_free(tracks[n].audio.buf);
1770
    ebml_free(matroska_segment, matroska);
1771

    
1772
    return 0;
1773
}
1774

    
1775
AVInputFormat matroska_demuxer = {
1776
    "matroska",
1777
    NULL_IF_CONFIG_SMALL("Matroska file format"),
1778
    sizeof(MatroskaDemuxContext),
1779
    matroska_probe,
1780
    matroska_read_header,
1781
    matroska_read_packet,
1782
    matroska_read_close,
1783
    matroska_read_seek,
1784
};