git.sesse.net Git - vlc/blob - modules/demux/avformat/demux.c

   1 /*****************************************************************************
   2  * demux.c: demuxer using ffmpeg (libavformat).
   3  *****************************************************************************
   4  * Copyright (C) 2004-2009 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *          Gildas Bazin <gbazin@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <vlc_common.h>
  34 #include <vlc_demux.h>
  35 #include <vlc_stream.h>
  36 #include <vlc_meta.h>
  37 #include <vlc_input.h>
  38 #include <vlc_charset.h>
  39 #include <vlc_avcodec.h>
  40
  41 /* ffmpeg header */
  42 #if defined(HAVE_LIBAVFORMAT_AVFORMAT_H)
  43 #   include <libavformat/avformat.h>
  44 #elif defined(HAVE_FFMPEG_AVFORMAT_H)
  45 #   include <ffmpeg/avformat.h>
  46 #endif
  47
  48 #include "../../codec/avcodec/avcodec.h"
  49 #include "avformat.h"
  50 #include "../xiph.h"
  51 #include "../vobsub.h"
  52
  53 //#define AVFORMAT_DEBUG 1
  54
  55 /* Version checking */
  56 #if defined(HAVE_FFMPEG_AVFORMAT_H) || defined(HAVE_LIBAVFORMAT_AVFORMAT_H)
  57
  58 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(50<<8)+0) )
  59 #   define HAVE_FFMPEG_CODEC_ATTACHMENT 1
  60 #endif
  61
  62 #if (LIBAVFORMAT_VERSION_INT >= ((52<<16)+(15<<8)+0) )
  63 #   define HAVE_FFMPEG_CHAPTERS 1
  64 #endif
  65
  66 /*****************************************************************************
  67  * demux_sys_t: demux descriptor
  68  *****************************************************************************/
  69 struct demux_sys_t
  70 {
  71     ByteIOContext   io;
  72     int             io_buffer_size;
  73     uint8_t        *io_buffer;
  74
  75     AVInputFormat  *fmt;
  76     AVFormatContext *ic;
  77     URLContext     url;
  78     URLProtocol    prot;
  79
  80     int             i_tk;
  81     es_out_id_t     **tk;
  82
  83     int64_t     i_pcr;
  84     int64_t     i_pcr_inc;
  85     int         i_pcr_tk;
  86
  87     unsigned    i_ssa_order;
  88
  89     int                i_attachments;
  90     input_attachment_t **attachments;
  91
  92     /* Only one title with seekpoints possible atm. */
  93     input_title_t *p_title;
  94 };
  95
  96 /*****************************************************************************
  97  * Local prototypes
  98  *****************************************************************************/
  99 static int Demux  ( demux_t *p_demux );
 100 static int Control( demux_t *p_demux, int i_query, va_list args );
 101
 102 static int IORead( void *opaque, uint8_t *buf, int buf_size );
 103 static int64_t IOSeek( void *opaque, int64_t offset, int whence );
 104
 105 static block_t *BuildSsaFrame( const AVPacket *p_pkt, unsigned i_order );
 106 static void UpdateSeekPoint( demux_t *p_demux, int64_t i_time );
 107
 108 /*****************************************************************************
 109  * Open
 110  *****************************************************************************/
 111 int OpenDemux( vlc_object_t *p_this )
 112 {
 113     demux_t       *p_demux = (demux_t*)p_this;
 114     demux_sys_t   *p_sys;
 115     AVProbeData   pd;
 116     AVInputFormat *fmt;
 117     unsigned int  i;
 118     int64_t       i_start_time = -1;
 119     bool          b_can_seek;
 120     char         *psz_url;
 121
 122     if( p_demux->psz_file )
 123         psz_url = strdup( p_demux->psz_file );
 124     else
 125     {
 126         if( asprintf( &psz_url, "%s://%s", p_demux->psz_access, p_demux->psz_location ) == -1)
 127             return VLC_ENOMEM;
 128     }
 129     msg_Dbg( p_demux, "trying url: %s", psz_url );
 130     /* Init Probe data */
 131     pd.filename = psz_url;
 132     if( ( pd.buf_size = stream_Peek( p_demux->s, &pd.buf, 2048 + 213 ) ) <= 0 )
 133     {
 134         free( psz_url );
 135         msg_Warn( p_demux, "cannot peek" );
 136         return VLC_EGENERIC;
 137     }
 138
 139     vlc_avcodec_lock();
 140     av_register_all(); /* Can be called several times */
 141     vlc_avcodec_unlock();
 142
 143     /* Guess format */
 144     if( !( fmt = av_probe_input_format( &pd, 1 ) ) )
 145     {
 146         msg_Dbg( p_demux, "couldn't guess format" );
 147         free( psz_url );
 148         return VLC_EGENERIC;
 149     }
 150
 151     /* Don't try to handle MPEG unless forced */
 152     if( !p_demux->b_force &&
 153         ( !strcmp( fmt->name, "mpeg" ) ||
 154           !strcmp( fmt->name, "vcd" ) ||
 155           !strcmp( fmt->name, "vob" ) ||
 156           !strcmp( fmt->name, "mpegts" ) ||
 157           /* libavformat's redirector won't work */
 158           !strcmp( fmt->name, "redir" ) ||
 159           !strcmp( fmt->name, "sdp" ) ) )
 160     {
 161         free( psz_url );
 162         return VLC_EGENERIC;
 163     }
 164
 165     /* Don't trigger false alarms on bin files */
 166     if( !p_demux->b_force && !strcmp( fmt->name, "psxstr" ) )
 167     {
 168         int i_len;
 169
 170         if( !p_demux->psz_file )
 171         {
 172             free( psz_url );
 173             return VLC_EGENERIC;
 174         }
 175
 176         i_len = strlen( p_demux->psz_file );
 177         if( i_len < 4 )
 178         {
 179             free( psz_url );
 180             return VLC_EGENERIC;
 181         }
 182
 183         if( strcasecmp( &p_demux->psz_file[i_len - 4], ".str" ) &&
 184             strcasecmp( &p_demux->psz_file[i_len - 4], ".xai" ) &&
 185             strcasecmp( &p_demux->psz_file[i_len - 3], ".xa" ) )
 186         {
 187             free( psz_url );
 188             return VLC_EGENERIC;
 189         }
 190     }
 191
 192     msg_Dbg( p_demux, "detected format: %s", fmt->name );
 193
 194     /* Fill p_demux fields */
 195     p_demux->pf_demux = Demux;
 196     p_demux->pf_control = Control;
 197     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 198     p_sys->ic = 0;
 199     p_sys->fmt = fmt;
 200     p_sys->i_tk = 0;
 201     p_sys->tk = NULL;
 202     p_sys->i_pcr_tk = -1;
 203     p_sys->i_pcr = -1;
 204     p_sys->i_ssa_order = 0;
 205     TAB_INIT( p_sys->i_attachments, p_sys->attachments);
 206     p_sys->p_title = NULL;
 207
 208     /* Create I/O wrapper */
 209     p_sys->io_buffer_size = 32768;  /* FIXME */
 210     p_sys->io_buffer = malloc( p_sys->io_buffer_size );
 211     p_sys->url.priv_data = p_demux;
 212     p_sys->url.prot = &p_sys->prot;
 213     p_sys->url.prot->name = "VLC I/O wrapper";
 214     p_sys->url.prot->url_open = 0;
 215     p_sys->url.prot->url_read =
 216                     (int (*) (URLContext *, unsigned char *, int))IORead;
 217     p_sys->url.prot->url_write = 0;
 218     p_sys->url.prot->url_seek =
 219                     (int64_t (*) (URLContext *, int64_t, int))IOSeek;
 220     p_sys->url.prot->url_close = 0;
 221     p_sys->url.prot->next = 0;
 222     init_put_byte( &p_sys->io, p_sys->io_buffer, p_sys->io_buffer_size,
 223                    0, &p_sys->url, IORead, NULL, IOSeek );
 224
 225     stream_Control( p_demux->s, STREAM_CAN_SEEK, &b_can_seek );
 226     if( !b_can_seek )
 227     {
 228        /* Tell avformat that input is stream, so it doesn't get stuck
 229        when trying av_find_stream_info() trying to seek all the wrong places
 230        init_put_byte defaults io.is_streamed=0, so thats why we set them after it
 231        */
 232        p_sys->url.is_streamed = 1;
 233        p_sys->io.is_streamed = 1;
 234     }
 235
 236
 237     /* Open it */
 238     if( av_open_input_stream( &p_sys->ic, &p_sys->io, psz_url,
 239                               p_sys->fmt, NULL ) )
 240     {
 241         msg_Err( p_demux, "av_open_input_stream failed" );
 242         free( psz_url );
 243         CloseDemux( p_this );
 244         return VLC_EGENERIC;
 245     }
 246     free( psz_url );
 247     psz_url = NULL;
 248
 249     vlc_avcodec_lock(); /* avformat calls avcodec behind our back!!! */
 250     if( av_find_stream_info( p_sys->ic ) < 0 )
 251     {
 252         msg_Warn( p_demux, "av_find_stream_info failed" );
 253     }
 254     vlc_avcodec_unlock();
 255
 256     for( i = 0; i < p_sys->ic->nb_streams; i++ )
 257     {
 258         AVStream *s = p_sys->ic->streams[i];
 259         AVCodecContext *cc = s->codec;
 260
 261         es_out_id_t  *es;
 262         es_format_t  fmt;
 263         vlc_fourcc_t fcc;
 264         const char *psz_type = "unknown";
 265
 266         if( !GetVlcFourcc( cc->codec_id, NULL, &fcc, NULL ) )
 267             fcc = VLC_FOURCC( 'u', 'n', 'd', 'f' );
 268
 269         switch( cc->codec_type )
 270         {
 271         case CODEC_TYPE_AUDIO:
 272             es_format_Init( &fmt, AUDIO_ES, fcc );
 273             fmt.i_bitrate = cc->bit_rate;
 274             fmt.audio.i_channels = cc->channels;
 275             fmt.audio.i_rate = cc->sample_rate;
 276 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
 277             fmt.audio.i_bitspersample = cc->bits_per_sample;
 278 #else
 279             fmt.audio.i_bitspersample = cc->bits_per_coded_sample;
 280 #endif
 281             fmt.audio.i_blockalign = cc->block_align;
 282             psz_type = "audio";
 283             break;
 284
 285         case CODEC_TYPE_VIDEO:
 286             es_format_Init( &fmt, VIDEO_ES, fcc );
 287
 288             /* Special case for raw video data */
 289             if( cc->codec_id == CODEC_ID_RAWVIDEO )
 290             {
 291                 msg_Dbg( p_demux, "raw video, pixel format: %i", cc->pix_fmt );
 292                 if( GetVlcChroma( &fmt.video, cc->pix_fmt ) != VLC_SUCCESS)
 293                 {
 294                     msg_Err( p_demux, "was unable to find a FourCC match for raw video" );
 295                 }
 296                 else
 297                     fmt.i_codec = fmt.video.i_chroma;
 298             }
 299             /* We need this for the h264 packetizer */
 300             else if( cc->codec_id == CODEC_ID_H264 && ( !strcmp( p_sys->fmt->name, "flv" ) ||
 301                 !strcmp( p_sys->fmt->name, "matroska" ) || !strcmp( p_sys->fmt->name, "mp4" ) ) )
 302                 fmt.i_original_fourcc = VLC_FOURCC( 'a', 'v', 'c', '1' );
 303
 304             fmt.video.i_width = cc->width;
 305             fmt.video.i_height = cc->height;
 306             if( cc->palctrl )
 307             {
 308                 fmt.video.p_palette = malloc( sizeof(video_palette_t) );
 309                 *fmt.video.p_palette = *(video_palette_t *)cc->palctrl;
 310             }
 311             psz_type = "video";
 312             fmt.video.i_frame_rate = cc->time_base.den;
 313             fmt.video.i_frame_rate_base = cc->time_base.num;
 314             break;
 315
 316         case CODEC_TYPE_SUBTITLE:
 317             es_format_Init( &fmt, SPU_ES, fcc );
 318             if( strncmp( p_sys->ic->iformat->name, "matroska", 8 ) == 0 &&
 319                 cc->codec_id == CODEC_ID_DVD_SUBTITLE &&
 320                 cc->extradata != NULL &&
 321                 cc->extradata_size > 0 )
 322             {
 323                 char *psz_start;
 324                 char *psz_buf = malloc( cc->extradata_size + 1);
 325                 if( psz_buf != NULL )
 326                 {
 327                     memcpy( psz_buf, cc->extradata , cc->extradata_size );
 328                     psz_buf[cc->extradata_size] = '\0';
 329
 330                     psz_start = strstr( psz_buf, "size:" );
 331                     if( psz_start &&
 332                         vobsub_size_parse( psz_start,
 333                                            &fmt.subs.spu.i_original_frame_width,
 334                                            &fmt.subs.spu.i_original_frame_height ) == VLC_SUCCESS )
 335                     {
 336                         msg_Dbg( p_demux, "original frame size: %dx%d",
 337                                  fmt.subs.spu.i_original_frame_width,
 338                                  fmt.subs.spu.i_original_frame_height );
 339                     }
 340                     else
 341                     {
 342                         msg_Warn( p_demux, "reading original frame size failed" );
 343                     }
 344
 345                     psz_start = strstr( psz_buf, "palette:" );
 346                     if( psz_start &&
 347                         vobsub_palette_parse( psz_start, &fmt.subs.spu.palette[1] ) == VLC_SUCCESS )
 348                     {
 349                         fmt.subs.spu.palette[0] =  0xBeef;
 350                         msg_Dbg( p_demux, "vobsub palette read" );
 351                     }
 352                     else
 353                     {
 354                         msg_Warn( p_demux, "reading original palette failed" );
 355                     }
 356                     free( psz_buf );
 357                 }
 358             }
 359
 360             psz_type = "subtitle";
 361             break;
 362
 363         default:
 364             es_format_Init( &fmt, UNKNOWN_ES, 0 );
 365 #ifdef HAVE_FFMPEG_CODEC_ATTACHMENT
 366             if( cc->codec_type == CODEC_TYPE_ATTACHMENT )
 367             {
 368                 input_attachment_t *p_attachment;
 369                 psz_type = "attachment";
 370                 if( cc->codec_id == CODEC_ID_TTF )
 371                 {
 372                     p_attachment = vlc_input_attachment_New( s->filename, "application/x-truetype-font", NULL,
 373                                              cc->extradata, (int)cc->extradata_size );
 374                     TAB_APPEND( p_sys->i_attachments, p_sys->attachments, p_attachment );
 375                 }
 376                 else msg_Warn( p_demux, "unsupported attachment type in ffmpeg demux" );
 377             }
 378             break;
 379 #endif
 380
 381             if( cc->codec_type == CODEC_TYPE_DATA )
 382                 psz_type = "data";
 383
 384             msg_Warn( p_demux, "unsupported track type in ffmpeg demux" );
 385             break;
 386         }
 387         fmt.psz_language = strdup( s->language );
 388         if( s->disposition & AV_DISPOSITION_DEFAULT )
 389             fmt.i_priority = 1000;
 390
 391 #ifdef HAVE_FFMPEG_CODEC_ATTACHMENT
 392         if( cc->codec_type != CODEC_TYPE_ATTACHMENT )
 393 #endif
 394         {
 395             const bool    b_ogg = !strcmp( p_sys->fmt->name, "ogg" );
 396             const uint8_t *p_extra = cc->extradata;
 397             unsigned      i_extra  = cc->extradata_size;
 398
 399             if( cc->codec_id == CODEC_ID_THEORA && b_ogg )
 400             {
 401                 unsigned pi_size[3];
 402                 void     *pp_data[3];
 403                 unsigned i_count;
 404                 for( i_count = 0; i_count < 3; i_count++ )
 405                 {
 406                     if( i_extra < 2 )
 407                         break;
 408                     pi_size[i_count] = GetWBE( p_extra );
 409                     pp_data[i_count] = (uint8_t*)&p_extra[2];
 410                     if( i_extra < pi_size[i_count] + 2 )
 411                         break;
 412
 413                     p_extra += 2 + pi_size[i_count];
 414                     i_extra -= 2 + pi_size[i_count];
 415                 }
 416                 if( i_count > 0 && xiph_PackHeaders( &fmt.i_extra, &fmt.p_extra,
 417                                                      pi_size, pp_data, i_count ) )
 418                 {
 419                     fmt.i_extra = 0;
 420                     fmt.p_extra = NULL;
 421                 }
 422             }
 423             else if( cc->codec_id == CODEC_ID_SPEEX && b_ogg )
 424             {
 425                 uint8_t p_dummy_comment[] = {
 426                     0, 0, 0, 0,
 427                     0, 0, 0, 0,
 428                 };
 429                 unsigned pi_size[2];
 430                 void     *pp_data[2];
 431
 432                 pi_size[0] = i_extra;
 433                 pp_data[0] = (uint8_t*)p_extra;
 434
 435                 pi_size[1] = sizeof(p_dummy_comment);
 436                 pp_data[1] = p_dummy_comment;
 437
 438                 if( pi_size[0] > 0 && xiph_PackHeaders( &fmt.i_extra, &fmt.p_extra,
 439                                                         pi_size, pp_data, 2 ) )
 440                 {
 441                     fmt.i_extra = 0;
 442                     fmt.p_extra = NULL;
 443                 }
 444             }
 445             else if( cc->extradata_size > 0 )
 446             {
 447                 fmt.p_extra = malloc( i_extra );
 448                 if( fmt.p_extra )
 449                 {
 450                     fmt.i_extra = i_extra;
 451                     memcpy( fmt.p_extra, p_extra, i_extra );
 452                 }
 453             }
 454         }
 455         es = es_out_Add( p_demux->out, &fmt );
 456         if( s->disposition & AV_DISPOSITION_DEFAULT )
 457             es_out_Control( p_demux->out, ES_OUT_SET_ES_DEFAULT, es );
 458         es_format_Clean( &fmt );
 459
 460         msg_Dbg( p_demux, "adding es: %s codec = %4.4s",
 461                  psz_type, (char*)&fcc );
 462         TAB_APPEND( p_sys->i_tk, p_sys->tk, es );
 463     }
 464     if( p_sys->ic->start_time != (int64_t)AV_NOPTS_VALUE )
 465         i_start_time = p_sys->ic->start_time * 1000000 / AV_TIME_BASE;
 466
 467     msg_Dbg( p_demux, "AVFormat supported stream" );
 468     msg_Dbg( p_demux, "    - format = %s (%s)",
 469              p_sys->fmt->name, p_sys->fmt->long_name );
 470     msg_Dbg( p_demux, "    - start time = %"PRId64, i_start_time );
 471     msg_Dbg( p_demux, "    - duration = %"PRId64,
 472              ( p_sys->ic->duration != (int64_t)AV_NOPTS_VALUE ) ?
 473              p_sys->ic->duration * 1000000 / AV_TIME_BASE : -1 );
 474
 475 #ifdef HAVE_FFMPEG_CHAPTERS
 476     if( p_sys->ic->nb_chapters > 0 )
 477         p_sys->p_title = vlc_input_title_New();
 478     for( i = 0; i < p_sys->ic->nb_chapters; i++ )
 479     {
 480         seekpoint_t *s = vlc_seekpoint_New();
 481
 482         if( p_sys->ic->chapters[i]->title )
 483         {
 484             s->psz_name = strdup( p_sys->ic->chapters[i]->title );
 485             EnsureUTF8( s->psz_name );
 486             msg_Dbg( p_demux, "    - chapter %d: %s", i, s->psz_name );
 487         }
 488         s->i_time_offset = p_sys->ic->chapters[i]->start * 1000000 *
 489             p_sys->ic->chapters[i]->time_base.num /
 490             p_sys->ic->chapters[i]->time_base.den -
 491             (i_start_time != -1 ? i_start_time : 0 );
 492         TAB_APPEND( p_sys->p_title->i_seekpoint, p_sys->p_title->seekpoint, s );
 493     }
 494 #endif
 495
 496     return VLC_SUCCESS;
 497 }
 498
 499 /*****************************************************************************
 500  * Close
 501  *****************************************************************************/
 502 void CloseDemux( vlc_object_t *p_this )
 503 {
 504     demux_t     *p_demux = (demux_t*)p_this;
 505     demux_sys_t *p_sys = p_demux->p_sys;
 506
 507     FREENULL( p_sys->tk );
 508
 509     if( p_sys->ic ) av_close_input_stream( p_sys->ic );
 510
 511     for( int i = 0; i < p_sys->i_attachments; i++ )
 512         free( p_sys->attachments[i] );
 513     TAB_CLEAN( p_sys->i_attachments, p_sys->attachments);
 514
 515     if( p_sys->p_title )
 516         vlc_input_title_Delete( p_sys->p_title );
 517
 518     free( p_sys->io_buffer );
 519     free( p_sys );
 520 }
 521
 522 /*****************************************************************************
 523  * Demux:
 524  *****************************************************************************/
 525 static int Demux( demux_t *p_demux )
 526 {
 527     demux_sys_t *p_sys = p_demux->p_sys;
 528     AVPacket    pkt;
 529     block_t     *p_frame;
 530     int64_t     i_start_time;
 531
 532     /* Read a frame */
 533     if( av_read_frame( p_sys->ic, &pkt ) )
 534     {
 535         return 0;
 536     }
 537     if( pkt.stream_index < 0 || pkt.stream_index >= p_sys->i_tk )
 538     {
 539         av_free_packet( &pkt );
 540         return 1;
 541     }
 542     const AVStream *p_stream = p_sys->ic->streams[pkt.stream_index];
 543     if( p_stream->time_base.den <= 0 )
 544     {
 545         msg_Warn( p_demux, "Invalid time base for the stream %d", pkt.stream_index );
 546         av_free_packet( &pkt );
 547         return 1;
 548     }
 549     if( p_stream->codec->codec_id == CODEC_ID_SSA )
 550     {
 551         p_frame = BuildSsaFrame( &pkt, p_sys->i_ssa_order++ );
 552         if( !p_frame )
 553         {
 554             av_free_packet( &pkt );
 555             return 1;
 556         }
 557     }
 558     else
 559     {
 560         if( ( p_frame = block_New( p_demux, pkt.size ) ) == NULL )
 561         {
 562             av_free_packet( &pkt );
 563             return 0;
 564         }
 565         memcpy( p_frame->p_buffer, pkt.data, pkt.size );
 566     }
 567
 568     if( pkt.flags & PKT_FLAG_KEY )
 569         p_frame->i_flags |= BLOCK_FLAG_TYPE_I;
 570
 571     i_start_time = ( p_sys->ic->start_time != (int64_t)AV_NOPTS_VALUE ) ?
 572         ( p_sys->ic->start_time * 1000000 / AV_TIME_BASE )  : 0;
 573
 574     p_frame->i_dts = ( pkt.dts == (int64_t)AV_NOPTS_VALUE ) ?
 575         VLC_TS_INVALID : (pkt.dts) * 1000000 *
 576         p_stream->time_base.num /
 577         p_stream->time_base.den - i_start_time + VLC_TS_0;
 578     p_frame->i_pts = ( pkt.pts == (int64_t)AV_NOPTS_VALUE ) ?
 579         VLC_TS_INVALID : (pkt.pts) * 1000000 *
 580         p_stream->time_base.num /
 581         p_stream->time_base.den - i_start_time + VLC_TS_0;
 582     if( pkt.duration > 0 && p_frame->i_length <= 0 )
 583         p_frame->i_length = pkt.duration * 1000000 *
 584             p_stream->time_base.num /
 585             p_stream->time_base.den;
 586
 587     if( pkt.dts != AV_NOPTS_VALUE && pkt.dts == pkt.pts &&
 588         p_stream->codec->codec_type == CODEC_TYPE_VIDEO )
 589     {
 590         /* Add here notoriously bugged file formats/samples regarding PTS */
 591         if( !strcmp( p_sys->fmt->name, "flv" ) )
 592             p_frame->i_pts = VLC_TS_INVALID;
 593     }
 594 #ifdef AVFORMAT_DEBUG
 595     msg_Dbg( p_demux, "tk[%d] dts=%"PRId64" pts=%"PRId64,
 596              pkt.stream_index, p_frame->i_dts, p_frame->i_pts );
 597 #endif
 598
 599     if( p_frame->i_dts > VLC_TS_INVALID  &&
 600         ( pkt.stream_index == p_sys->i_pcr_tk || p_sys->i_pcr_tk < 0 ) )
 601     {
 602         p_sys->i_pcr_tk = pkt.stream_index;
 603         p_sys->i_pcr = p_frame->i_dts;
 604
 605         es_out_Control( p_demux->out, ES_OUT_SET_PCR, (int64_t)p_sys->i_pcr );
 606     }
 607
 608     es_out_Send( p_demux->out, p_sys->tk[pkt.stream_index], p_frame );
 609
 610     UpdateSeekPoint( p_demux, p_sys->i_pcr);
 611     av_free_packet( &pkt );
 612     return 1;
 613 }
 614
 615 static void UpdateSeekPoint( demux_t *p_demux, int64_t i_time )
 616 {
 617     demux_sys_t *p_sys = p_demux->p_sys;
 618     int i;
 619
 620     if( !p_sys->p_title )
 621         return;
 622
 623     for( i = 0; i < p_sys->p_title->i_seekpoint; i++ )
 624     {
 625         if( i_time < p_sys->p_title->seekpoint[i]->i_time_offset )
 626             break;
 627     }
 628     i--;
 629
 630     if( i != p_demux->info.i_seekpoint && i >= 0 )
 631     {
 632         p_demux->info.i_seekpoint = i;
 633         p_demux->info.i_update |= INPUT_UPDATE_SEEKPOINT;
 634     }
 635 }
 636
 637 static block_t *BuildSsaFrame( const AVPacket *p_pkt, unsigned i_order )
 638 {
 639     if( p_pkt->size <= 0 )
 640         return NULL;
 641
 642     char buffer[256];
 643     const size_t i_buffer_size = __MIN( sizeof(buffer) - 1, p_pkt->size );
 644     memcpy( buffer, p_pkt->data, i_buffer_size );
 645     buffer[i_buffer_size] = '\0';
 646
 647     /* */
 648     int i_layer;
 649     int h0, m0, s0, c0;
 650     int h1, m1, s1, c1;
 651     int i_position = 0;
 652     if( sscanf( buffer, "Dialogue: %d,%d:%d:%d.%d,%d:%d:%d.%d,%n", &i_layer,
 653                 &h0, &m0, &s0, &c0, &h1, &m1, &s1, &c1, &i_position ) < 9 )
 654         return NULL;
 655     if( i_position <= 0 || i_position >= i_buffer_size )
 656         return NULL;
 657
 658     char *p;
 659     if( asprintf( &p, "%u,%d,%.*s", i_order, i_layer, p_pkt->size - i_position, p_pkt->data + i_position ) < 0 )
 660         return NULL;
 661
 662     block_t *p_frame = block_heap_Alloc( p, p, strlen(p) + 1 );
 663     if( p_frame )
 664         p_frame->i_length = CLOCK_FREQ * ((h1 - h1) * 3600 +
 665                                           (m1-m0) * 60 +
 666                                           (s1-s0) * 1) +
 667                             CLOCK_FREQ * (c1-c0) / 100;
 668     return p_frame;
 669 }
 670
 671 /*****************************************************************************
 672  * Control:
 673  *****************************************************************************/
 674 static int Control( demux_t *p_demux, int i_query, va_list args )
 675 {
 676     demux_sys_t *p_sys = p_demux->p_sys;
 677     double f, *pf;
 678     int64_t i64, *pi64;
 679
 680     switch( i_query )
 681     {
 682         case DEMUX_GET_POSITION:
 683             pf = (double*) va_arg( args, double* ); *pf = 0.0;
 684             i64 = stream_Size( p_demux->s );
 685             if( i64 > 0 )
 686             {
 687                 double current = stream_Tell( p_demux->s );
 688                 *pf = current / (double)i64;
 689             }
 690
 691             if( (p_sys->ic->duration != (int64_t)AV_NOPTS_VALUE) && (p_sys->i_pcr > 0) )
 692             {
 693                 *pf = (double)p_sys->i_pcr / (double)p_sys->ic->duration;
 694             }
 695
 696             return VLC_SUCCESS;
 697
 698         case DEMUX_SET_POSITION:
 699             f = (double) va_arg( args, double );
 700             if( p_sys->i_pcr > 0 )
 701             {
 702                 i64 = p_sys->ic->duration * f;
 703                 if( p_sys->ic->start_time != (int64_t)AV_NOPTS_VALUE )
 704                     i64 += p_sys->ic->start_time;
 705
 706                 msg_Warn( p_demux, "DEMUX_SET_POSITION: %"PRId64, i64 );
 707
 708                 /* If we have a duration, we prefer to seek by time
 709                    but if we don't, or if the seek fails, try BYTE seeking */
 710                 if( p_sys->ic->duration == (int64_t)AV_NOPTS_VALUE ||
 711                     (av_seek_frame( p_sys->ic, -1, i64, 0 ) < 0) )
 712                 {
 713                     int64_t i_size = stream_Size( p_demux->s );
 714                     i64 = (i_size * f);
 715
 716                     msg_Warn( p_demux, "DEMUX_SET_BYTE_POSITION: %"PRId64, i64 );
 717                     if( av_seek_frame( p_sys->ic, -1, i64, AVSEEK_FLAG_BYTE ) < 0 )
 718                         return VLC_EGENERIC;
 719                 }
 720                 else
 721                 {
 722                     UpdateSeekPoint( p_demux, i64 );
 723                 }
 724                 p_sys->i_pcr = -1; /* Invalidate time display */
 725             }
 726             return VLC_SUCCESS;
 727
 728         case DEMUX_GET_LENGTH:
 729             pi64 = (int64_t*)va_arg( args, int64_t * );
 730             if( p_sys->ic->duration != (int64_t)AV_NOPTS_VALUE )
 731                 *pi64 = p_sys->ic->duration * 1000000 / AV_TIME_BASE;
 732             else
 733                 *pi64 = 0;
 734             return VLC_SUCCESS;
 735
 736         case DEMUX_GET_TIME:
 737             pi64 = (int64_t*)va_arg( args, int64_t * );
 738             *pi64 = p_sys->i_pcr;
 739             return VLC_SUCCESS;
 740
 741         case DEMUX_SET_TIME:
 742             i64 = (int64_t)va_arg( args, int64_t );
 743             i64 = i64 *AV_TIME_BASE / 1000000;
 744             if( p_sys->ic->start_time != (int64_t)AV_NOPTS_VALUE )
 745                 i64 += p_sys->ic->start_time;
 746
 747             msg_Warn( p_demux, "DEMUX_SET_TIME: %"PRId64, i64 );
 748
 749             if( av_seek_frame( p_sys->ic, -1, i64, 0 ) < 0 )
 750             {
 751                 return VLC_EGENERIC;
 752             }
 753             p_sys->i_pcr = -1; /* Invalidate time display */
 754             UpdateSeekPoint( p_demux, i64 );
 755             return VLC_SUCCESS;
 756
 757         case DEMUX_HAS_UNSUPPORTED_META:
 758         {
 759             bool *pb_bool = (bool*)va_arg( args, bool* );
 760             *pb_bool = true;
 761             return VLC_SUCCESS;
 762         }
 763
 764
 765         case DEMUX_GET_META:
 766         {
 767             vlc_meta_t *p_meta = (vlc_meta_t*)va_arg( args, vlc_meta_t* );
 768
 769             if( !p_sys->ic->title[0] || !p_sys->ic->author[0] ||
 770                 !p_sys->ic->copyright[0] || !p_sys->ic->comment[0] ||
 771                 /*!p_sys->ic->album[0] ||*/ !p_sys->ic->genre[0] )
 772             {
 773                 return VLC_EGENERIC;
 774             }
 775
 776             if( p_sys->ic->title[0] )
 777                 vlc_meta_SetTitle( p_meta, p_sys->ic->title );
 778             if( p_sys->ic->author[0] )
 779                 vlc_meta_SetArtist( p_meta, p_sys->ic->author );
 780             if( p_sys->ic->copyright[0] )
 781                 vlc_meta_SetCopyright( p_meta, p_sys->ic->copyright );
 782             if( p_sys->ic->comment[0] )
 783                 vlc_meta_SetDescription( p_meta, p_sys->ic->comment );
 784             if( p_sys->ic->genre[0] )
 785                 vlc_meta_SetGenre( p_meta, p_sys->ic->genre );
 786             return VLC_SUCCESS;
 787         }
 788
 789         case DEMUX_GET_ATTACHMENTS:
 790         {
 791             input_attachment_t ***ppp_attach =
 792                 (input_attachment_t***)va_arg( args, input_attachment_t*** );
 793             int *pi_int = (int*)va_arg( args, int * );
 794             int i;
 795
 796             if( p_sys->i_attachments <= 0 )
 797                 return VLC_EGENERIC;
 798
 799             *pi_int = p_sys->i_attachments;;
 800             *ppp_attach = malloc( sizeof(input_attachment_t**) * p_sys->i_attachments );
 801             for( i = 0; i < p_sys->i_attachments; i++ )
 802                 (*ppp_attach)[i] = vlc_input_attachment_Duplicate( p_sys->attachments[i] );
 803             return VLC_SUCCESS;
 804         }
 805
 806         case DEMUX_GET_TITLE_INFO:
 807         {
 808             input_title_t ***ppp_title = (input_title_t***)va_arg( args, input_title_t*** );
 809             int *pi_int    = (int*)va_arg( args, int* );
 810             int *pi_title_offset = (int*)va_arg( args, int* );
 811             int *pi_seekpoint_offset = (int*)va_arg( args, int* );
 812
 813             if( !p_sys->p_title )
 814                 return VLC_EGENERIC;
 815
 816             *pi_int = 1;
 817             *ppp_title = malloc( sizeof( input_title_t**) );
 818             (*ppp_title)[0] = vlc_input_title_Duplicate( p_sys->p_title );
 819             *pi_title_offset = 0;
 820             *pi_seekpoint_offset = 0;
 821             return VLC_SUCCESS;
 822         }
 823         case DEMUX_SET_TITLE:
 824         {
 825             const int i_title = (int)va_arg( args, int );
 826             if( !p_sys->p_title || i_title != 0 )
 827                 return VLC_EGENERIC;
 828             return VLC_SUCCESS;
 829         }
 830         case DEMUX_SET_SEEKPOINT:
 831         {
 832             const int i_seekpoint = (int)va_arg( args, int );
 833             if( !p_sys->p_title )
 834                 return VLC_EGENERIC;
 835
 836             i64 = p_sys->p_title->seekpoint[i_seekpoint]->i_time_offset *AV_TIME_BASE / 1000000;
 837             if( p_sys->ic->start_time != (int64_t)AV_NOPTS_VALUE )
 838                 i64 += p_sys->ic->start_time;
 839
 840             msg_Warn( p_demux, "DEMUX_SET_TIME: %"PRId64, i64 );
 841
 842             if( av_seek_frame( p_sys->ic, -1, i64, 0 ) < 0 )
 843             {
 844                 return VLC_EGENERIC;
 845             }
 846             p_sys->i_pcr = -1; /* Invalidate time display */
 847             UpdateSeekPoint( p_demux, i64 );
 848             return VLC_SUCCESS;
 849         }
 850
 851
 852         default:
 853             return VLC_EGENERIC;
 854     }
 855 }
 856
 857 /*****************************************************************************
 858  * I/O wrappers for libavformat
 859  *****************************************************************************/
 860 static int IORead( void *opaque, uint8_t *buf, int buf_size )
 861 {
 862     URLContext *p_url = opaque;
 863     demux_t *p_demux = p_url->priv_data;
 864     if( buf_size < 0 ) return -1;
 865     int i_ret = stream_Read( p_demux->s, buf, buf_size );
 866     return i_ret ? i_ret : -1;
 867 }
 868
 869 static int64_t IOSeek( void *opaque, int64_t offset, int whence )
 870 {
 871     URLContext *p_url = opaque;
 872     demux_t *p_demux = p_url->priv_data;
 873     int64_t i_absolute;
 874     int64_t i_size = stream_Size( p_demux->s );
 875
 876 #ifdef AVFORMAT_DEBUG
 877     msg_Warn( p_demux, "IOSeek offset: %"PRId64", whence: %i", offset, whence );
 878 #endif
 879
 880     switch( whence )
 881     {
 882 #ifdef AVSEEK_SIZE
 883         case AVSEEK_SIZE:
 884             return i_size;
 885 #endif
 886         case SEEK_SET:
 887             i_absolute = (int64_t)offset;
 888             break;
 889         case SEEK_CUR:
 890             i_absolute = stream_Tell( p_demux->s ) + (int64_t)offset;
 891             break;
 892         case SEEK_END:
 893             i_absolute = i_size + (int64_t)offset;
 894             break;
 895         default:
 896             return -1;
 897
 898     }
 899
 900     if( i_absolute < 0 )
 901     {
 902         msg_Dbg( p_demux, "Trying to seek before the beginning" );
 903         return -1;
 904     }
 905
 906     if( i_size > 0 && i_absolute >= i_size )
 907     {
 908         msg_Dbg( p_demux, "Trying to seek too far : EOF?" );
 909         return -1;
 910     }
 911
 912     if( stream_Seek( p_demux->s, i_absolute ) )
 913     {
 914         msg_Warn( p_demux, "we were not allowed to seek, or EOF " );
 915         return -1;
 916     }
 917
 918     return stream_Tell( p_demux->s );
 919 }
 920
 921 #endif /* HAVE_LIBAVFORMAT_AVFORMAT_H */