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