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