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

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