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     int64_t         *tk_pcr;
  75     int64_t         i_pcr;
  76
  77     unsigned    i_ssa_order;
  78
  79     int                i_attachments;
  80     input_attachment_t **attachments;
  81
  82     /* Only one title with seekpoints possible atm. */
  83     input_title_t *p_title;
  84 };
  85
  86 /*****************************************************************************
  87  * Local prototypes
  88  *****************************************************************************/
  89 static int Demux  ( demux_t *p_demux );
  90 static int Control( demux_t *p_demux, int i_query, va_list args );
  91
  92 static int IORead( void *opaque, uint8_t *buf, int buf_size );
  93 static int64_t IOSeek( void *opaque, int64_t offset, int whence );
  94
  95 static block_t *BuildSsaFrame( const AVPacket *p_pkt, unsigned i_order );
  96 static void UpdateSeekPoint( demux_t *p_demux, int64_t i_time );
  97 static void ResetTime( 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->tk_pcr = NULL;
 194     p_sys->i_ssa_order = 0;
 195     TAB_INIT( p_sys->i_attachments, p_sys->attachments);
 196     p_sys->p_title = NULL;
 197
 198     /* Create I/O wrapper */
 199     p_sys->io_buffer_size = 32768;  /* FIXME */
 200     p_sys->io_buffer = malloc( p_sys->io_buffer_size );
 201     p_sys->url.priv_data = p_demux;
 202     p_sys->url.prot = &p_sys->prot;
 203     p_sys->url.prot->name = "VLC I/O wrapper";
 204     p_sys->url.prot->url_open = 0;
 205     p_sys->url.prot->url_read =
 206                     (int (*) (URLContext *, unsigned char *, int))IORead;
 207     p_sys->url.prot->url_write = 0;
 208     p_sys->url.prot->url_seek =
 209                     (int64_t (*) (URLContext *, int64_t, int))IOSeek;
 210     p_sys->url.prot->url_close = 0;
 211     p_sys->url.prot->next = 0;
 212     init_put_byte( &p_sys->io, p_sys->io_buffer, p_sys->io_buffer_size,
 213                    0, &p_sys->url, IORead, NULL, IOSeek );
 214
 215     stream_Control( p_demux->s, STREAM_CAN_SEEK, &b_can_seek );
 216     if( !b_can_seek )
 217     {
 218        /* Tell avformat that input is stream, so it doesn't get stuck
 219        when trying av_find_stream_info() trying to seek all the wrong places
 220        init_put_byte defaults io.is_streamed=0, so thats why we set them after it
 221        */
 222        p_sys->url.is_streamed = 1;
 223        p_sys->io.is_streamed = 1;
 224 #if defined(AVIO_SEEKABLE_NORMAL)
 225        p_sys->io.seekable = 0;
 226 #endif
 227     }
 228
 229
 230     /* Open it */
 231     if( av_open_input_stream( &p_sys->ic, &p_sys->io, psz_url,
 232                               p_sys->fmt, NULL ) )
 233     {
 234         msg_Err( p_demux, "av_open_input_stream failed" );
 235         p_sys->ic = NULL;
 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 && ( p_sys->fmt == av_find_input_format("flv") ||
 291                 p_sys->fmt == av_find_input_format("matroska") || p_sys->fmt == av_find_input_format("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     p_sys->tk_pcr = calloc( p_sys->i_tk, sizeof(*p_sys->tk_pcr) );
 468
 469     if( p_sys->ic->start_time != (int64_t)AV_NOPTS_VALUE )
 470         i_start_time = p_sys->ic->start_time * 1000000 / AV_TIME_BASE;
 471
 472     msg_Dbg( p_demux, "AVFormat supported stream" );
 473     msg_Dbg( p_demux, "    - format = %s (%s)",
 474              p_sys->fmt->name, p_sys->fmt->long_name );
 475     msg_Dbg( p_demux, "    - start time = %"PRId64, i_start_time );
 476     msg_Dbg( p_demux, "    - duration = %"PRId64,
 477              ( p_sys->ic->duration != (int64_t)AV_NOPTS_VALUE ) ?
 478              p_sys->ic->duration * 1000000 / AV_TIME_BASE : -1 );
 479
 480     if( p_sys->ic->nb_chapters > 0 )
 481         p_sys->p_title = vlc_input_title_New();
 482     for( i = 0; i < p_sys->ic->nb_chapters; i++ )
 483     {
 484         seekpoint_t *s = vlc_seekpoint_New();
 485
 486         AVMetadataTag *title = av_metadata_get( p_sys->ic->metadata, "title", NULL, 0);
 487         if( title && title->value )
 488         {
 489             s->psz_name = strdup( title->value );
 490             EnsureUTF8( s->psz_name );
 491             msg_Dbg( p_demux, "    - chapter %d: %s", i, s->psz_name );
 492         }
 493         s->i_time_offset = p_sys->ic->chapters[i]->start * 1000000 *
 494             p_sys->ic->chapters[i]->time_base.num /
 495             p_sys->ic->chapters[i]->time_base.den -
 496             (i_start_time != -1 ? i_start_time : 0 );
 497         TAB_APPEND( p_sys->p_title->i_seekpoint, p_sys->p_title->seekpoint, s );
 498     }
 499
 500     ResetTime( p_demux, 0 );
 501     return VLC_SUCCESS;
 502 }
 503
 504 /*****************************************************************************
 505  * Close
 506  *****************************************************************************/
 507 void CloseDemux( vlc_object_t *p_this )
 508 {
 509     demux_t     *p_demux = (demux_t*)p_this;
 510     demux_sys_t *p_sys = p_demux->p_sys;
 511
 512     FREENULL( p_sys->tk );
 513     free( p_sys->tk_pcr );
 514
 515     if( p_sys->ic ) av_close_input_stream( p_sys->ic );
 516
 517     for( int i = 0; i < p_sys->i_attachments; i++ )
 518         free( p_sys->attachments[i] );
 519     TAB_CLEAN( p_sys->i_attachments, p_sys->attachments);
 520
 521     if( p_sys->p_title )
 522         vlc_input_title_Delete( p_sys->p_title );
 523
 524     free( p_sys->io_buffer );
 525     free( p_sys );
 526 }
 527
 528 /*****************************************************************************
 529  * Demux:
 530  *****************************************************************************/
 531 static int Demux( demux_t *p_demux )
 532 {
 533     demux_sys_t *p_sys = p_demux->p_sys;
 534     AVPacket    pkt;
 535     block_t     *p_frame;
 536     int64_t     i_start_time;
 537
 538     /* Read a frame */
 539     if( av_read_frame( p_sys->ic, &pkt ) )
 540     {
 541         return 0;
 542     }
 543     if( pkt.stream_index < 0 || pkt.stream_index >= p_sys->i_tk )
 544     {
 545         av_free_packet( &pkt );
 546         return 1;
 547     }
 548     const AVStream *p_stream = p_sys->ic->streams[pkt.stream_index];
 549     if( p_stream->time_base.den <= 0 )
 550     {
 551         msg_Warn( p_demux, "Invalid time base for the stream %d", pkt.stream_index );
 552         av_free_packet( &pkt );
 553         return 1;
 554     }
 555     if( p_stream->codec->codec_id == CODEC_ID_SSA )
 556     {
 557         p_frame = BuildSsaFrame( &pkt, p_sys->i_ssa_order++ );
 558         if( !p_frame )
 559         {
 560             av_free_packet( &pkt );
 561             return 1;
 562         }
 563     }
 564     else
 565     {
 566         if( ( p_frame = block_New( p_demux, pkt.size ) ) == NULL )
 567         {
 568             av_free_packet( &pkt );
 569             return 0;
 570         }
 571         memcpy( p_frame->p_buffer, pkt.data, pkt.size );
 572     }
 573
 574     if( pkt.flags & AV_PKT_FLAG_KEY )
 575         p_frame->i_flags |= BLOCK_FLAG_TYPE_I;
 576
 577     i_start_time = ( p_sys->ic->start_time != (int64_t)AV_NOPTS_VALUE ) ?
 578         ( p_sys->ic->start_time * 1000000 / AV_TIME_BASE )  : 0;
 579
 580     p_frame->i_dts = ( pkt.dts == (int64_t)AV_NOPTS_VALUE ) ?
 581         VLC_TS_INVALID : (pkt.dts) * 1000000 *
 582         p_stream->time_base.num /
 583         p_stream->time_base.den - i_start_time + VLC_TS_0;
 584     p_frame->i_pts = ( pkt.pts == (int64_t)AV_NOPTS_VALUE ) ?
 585         VLC_TS_INVALID : (pkt.pts) * 1000000 *
 586         p_stream->time_base.num /
 587         p_stream->time_base.den - i_start_time + VLC_TS_0;
 588     if( pkt.duration > 0 && p_frame->i_length <= 0 )
 589         p_frame->i_length = pkt.duration * 1000000 *
 590             p_stream->time_base.num /
 591             p_stream->time_base.den;
 592
 593     if( pkt.dts != AV_NOPTS_VALUE && pkt.dts == pkt.pts &&
 594         p_stream->codec->codec_type == AVMEDIA_TYPE_VIDEO )
 595     {
 596         /* Add here notoriously bugged file formats/samples regarding PTS */
 597         if( !strcmp( p_sys->fmt->name, "flv" ) )
 598             p_frame->i_pts = VLC_TS_INVALID;
 599     }
 600 #ifdef AVFORMAT_DEBUG
 601     msg_Dbg( p_demux, "tk[%d] dts=%"PRId64" pts=%"PRId64,
 602              pkt.stream_index, p_frame->i_dts, p_frame->i_pts );
 603 #endif
 604     if( p_frame->i_dts > VLC_TS_INVALID )
 605         p_sys->tk_pcr[pkt.stream_index] = p_frame->i_dts;
 606
 607     int64_t i_ts_max = INT64_MIN;
 608     for( int i = 0; i < p_sys->i_tk; i++ )
 609         i_ts_max = __MAX( i_ts_max, p_sys->tk_pcr[i] );
 610
 611     int64_t i_ts_min = INT64_MAX;
 612     for( int i = 0; i < p_sys->i_tk; i++ )
 613     {
 614         if( p_sys->tk_pcr[i] > VLC_TS_INVALID && p_sys->tk_pcr[i] + 10 * CLOCK_FREQ >= i_ts_max )
 615             i_ts_min = __MIN( i_ts_min, p_sys->tk_pcr[i] );
 616     }
 617     if( i_ts_min >= p_sys->i_pcr )
 618     {
 619         p_sys->i_pcr = i_ts_min;
 620         es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_sys->i_pcr );
 621         UpdateSeekPoint( p_demux, p_sys->i_pcr );
 622     }
 623
 624     es_out_Send( p_demux->out, p_sys->tk[pkt.stream_index], p_frame );
 625
 626     av_free_packet( &pkt );
 627     return 1;
 628 }
 629
 630 static void UpdateSeekPoint( demux_t *p_demux, int64_t i_time )
 631 {
 632     demux_sys_t *p_sys = p_demux->p_sys;
 633     int i;
 634
 635     if( !p_sys->p_title )
 636         return;
 637
 638     for( i = 0; i < p_sys->p_title->i_seekpoint; i++ )
 639     {
 640         if( i_time < p_sys->p_title->seekpoint[i]->i_time_offset )
 641             break;
 642     }
 643     i--;
 644
 645     if( i != p_demux->info.i_seekpoint && i >= 0 )
 646     {
 647         p_demux->info.i_seekpoint = i;
 648         p_demux->info.i_update |= INPUT_UPDATE_SEEKPOINT;
 649     }
 650 }
 651
 652 static void ResetTime( demux_t *p_demux, int64_t i_time )
 653 {
 654     demux_sys_t *p_sys = p_demux->p_sys;
 655
 656     if( p_sys->ic->start_time == (int64_t)AV_NOPTS_VALUE || i_time < 0 )
 657         i_time = VLC_TS_INVALID;
 658     else if( i_time == 0 )
 659         i_time = 1;
 660
 661     p_sys->i_pcr = i_time;
 662     for( int i = 0; i < p_sys->i_tk; i++ )
 663         p_sys->tk_pcr[i] = i_time;
 664
 665     if( i_time > VLC_TS_INVALID )
 666     {
 667         es_out_Control( p_demux->out, ES_OUT_SET_NEXT_DISPLAY_TIME, i_time );
 668         UpdateSeekPoint( p_demux, i_time );
 669     }
 670 }
 671
 672 static block_t *BuildSsaFrame( const AVPacket *p_pkt, unsigned i_order )
 673 {
 674     if( p_pkt->size <= 0 )
 675         return NULL;
 676
 677     char buffer[256];
 678     const size_t i_buffer_size = __MIN( (int)sizeof(buffer) - 1, p_pkt->size );
 679     memcpy( buffer, p_pkt->data, i_buffer_size );
 680     buffer[i_buffer_size] = '\0';
 681
 682     /* */
 683     int i_layer;
 684     int h0, m0, s0, c0;
 685     int h1, m1, s1, c1;
 686     int i_position = 0;
 687     if( sscanf( buffer, "Dialogue: %d,%d:%d:%d.%d,%d:%d:%d.%d,%n", &i_layer,
 688                 &h0, &m0, &s0, &c0, &h1, &m1, &s1, &c1, &i_position ) < 9 )
 689         return NULL;
 690     if( i_position <= 0 || (unsigned)i_position >= i_buffer_size )
 691         return NULL;
 692
 693     char *p;
 694     if( asprintf( &p, "%u,%d,%.*s", i_order, i_layer, p_pkt->size - i_position, p_pkt->data + i_position ) < 0 )
 695         return NULL;
 696
 697     block_t *p_frame = block_heap_Alloc( p, p, strlen(p) + 1 );
 698     if( p_frame )
 699         p_frame->i_length = CLOCK_FREQ * ((h1-h0) * 3600 +
 700                                           (m1-m0) * 60 +
 701                                           (s1-s0) * 1) +
 702                             CLOCK_FREQ * (c1-c0) / 100;
 703     return p_frame;
 704 }
 705
 706 /*****************************************************************************
 707  * Control:
 708  *****************************************************************************/
 709 static int Control( demux_t *p_demux, int i_query, va_list args )
 710 {
 711     demux_sys_t *p_sys = p_demux->p_sys;
 712     const int64_t i_start_time = p_sys->ic->start_time != (int64_t)AV_NOPTS_VALUE ? p_sys->ic->start_time : 0;
 713     double f, *pf;
 714     int64_t i64, *pi64;
 715
 716     switch( i_query )
 717     {
 718         case DEMUX_GET_POSITION:
 719             pf = (double*) va_arg( args, double* ); *pf = 0.0;
 720             i64 = stream_Size( p_demux->s );
 721             if( i64 > 0 )
 722             {
 723                 double current = stream_Tell( p_demux->s );
 724                 *pf = current / (double)i64;
 725             }
 726
 727             if( (p_sys->ic->duration != (int64_t)AV_NOPTS_VALUE) && (p_sys->i_pcr > 0) )
 728             {
 729                 *pf = (double)p_sys->i_pcr / (double)p_sys->ic->duration;
 730             }
 731
 732             return VLC_SUCCESS;
 733
 734         case DEMUX_SET_POSITION:
 735             f = (double) va_arg( args, double );
 736             i64 = p_sys->ic->duration * f + i_start_time;
 737
 738             msg_Warn( p_demux, "DEMUX_SET_POSITION: %"PRId64, i64 );
 739
 740             /* If we have a duration, we prefer to seek by time
 741                but if we don't, or if the seek fails, try BYTE seeking */
 742             if( p_sys->ic->duration == (int64_t)AV_NOPTS_VALUE ||
 743                 (av_seek_frame( p_sys->ic, -1, i64, AVSEEK_FLAG_BACKWARD ) < 0) )
 744             {
 745                 int64_t i_size = stream_Size( p_demux->s );
 746                 i64 = (i_size * f);
 747
 748                 msg_Warn( p_demux, "DEMUX_SET_BYTE_POSITION: %"PRId64, i64 );
 749                 if( av_seek_frame( p_sys->ic, -1, i64, AVSEEK_FLAG_BYTE ) < 0 )
 750                     return VLC_EGENERIC;
 751
 752                 ResetTime( p_demux, -1 );
 753             }
 754             else
 755             {
 756                 ResetTime( p_demux, i64 - i_start_time );
 757             }
 758             return VLC_SUCCESS;
 759
 760         case DEMUX_GET_LENGTH:
 761             pi64 = (int64_t*)va_arg( args, int64_t * );
 762             if( p_sys->ic->duration != (int64_t)AV_NOPTS_VALUE )
 763                 *pi64 = p_sys->ic->duration * 1000000 / AV_TIME_BASE;
 764             else
 765                 *pi64 = 0;
 766             return VLC_SUCCESS;
 767
 768         case DEMUX_GET_TIME:
 769             pi64 = (int64_t*)va_arg( args, int64_t * );
 770             *pi64 = p_sys->i_pcr;
 771             return VLC_SUCCESS;
 772
 773         case DEMUX_SET_TIME:
 774         {
 775             i64 = (int64_t)va_arg( args, int64_t );
 776             i64 = i64 *AV_TIME_BASE / 1000000 + i_start_time;
 777
 778             msg_Warn( p_demux, "DEMUX_SET_TIME: %"PRId64, i64 );
 779
 780             if( av_seek_frame( p_sys->ic, -1, i64, AVSEEK_FLAG_BACKWARD ) < 0 )
 781             {
 782                 return VLC_EGENERIC;
 783             }
 784             ResetTime( p_demux, i64 - i_start_time );
 785             return VLC_SUCCESS;
 786         }
 787
 788         case DEMUX_HAS_UNSUPPORTED_META:
 789         {
 790             bool *pb_bool = (bool*)va_arg( args, bool* );
 791             *pb_bool = true;
 792             return VLC_SUCCESS;
 793         }
 794
 795
 796         case DEMUX_GET_META:
 797         {
 798             vlc_meta_t *p_meta = (vlc_meta_t*)va_arg( args, vlc_meta_t* );
 799
 800             AVMetadataTag *title = av_metadata_get( p_sys->ic->metadata, "language", NULL, 0 );
 801             AVMetadataTag *artist = av_metadata_get( p_sys->ic->metadata, "artist", NULL, 0 );
 802             AVMetadataTag *copyright = av_metadata_get( p_sys->ic->metadata, "copyright", NULL, 0 );
 803             AVMetadataTag *comment = av_metadata_get( p_sys->ic->metadata, "comment", NULL, 0 );
 804             AVMetadataTag *genre = av_metadata_get( p_sys->ic->metadata, "genre", NULL, 0 );
 805
 806             if( title && title->value )
 807                 vlc_meta_SetTitle( p_meta, title->value );
 808             if( artist && artist->value )
 809                 vlc_meta_SetArtist( p_meta, artist->value );
 810             if( copyright && copyright->value )
 811                 vlc_meta_SetCopyright( p_meta, copyright->value );
 812             if( comment && comment->value )
 813                 vlc_meta_SetDescription( p_meta, comment->value );
 814             if( genre && genre->value )
 815                 vlc_meta_SetGenre( p_meta, genre->value );
 816             return VLC_SUCCESS;
 817         }
 818
 819         case DEMUX_GET_ATTACHMENTS:
 820         {
 821             input_attachment_t ***ppp_attach =
 822                 (input_attachment_t***)va_arg( args, input_attachment_t*** );
 823             int *pi_int = (int*)va_arg( args, int * );
 824             int i;
 825
 826             if( p_sys->i_attachments <= 0 )
 827                 return VLC_EGENERIC;
 828
 829             *pi_int = p_sys->i_attachments;;
 830             *ppp_attach = malloc( sizeof(input_attachment_t**) * p_sys->i_attachments );
 831             for( i = 0; i < p_sys->i_attachments; i++ )
 832                 (*ppp_attach)[i] = vlc_input_attachment_Duplicate( p_sys->attachments[i] );
 833             return VLC_SUCCESS;
 834         }
 835
 836         case DEMUX_GET_TITLE_INFO:
 837         {
 838             input_title_t ***ppp_title = (input_title_t***)va_arg( args, input_title_t*** );
 839             int *pi_int    = (int*)va_arg( args, int* );
 840             int *pi_title_offset = (int*)va_arg( args, int* );
 841             int *pi_seekpoint_offset = (int*)va_arg( args, int* );
 842
 843             if( !p_sys->p_title )
 844                 return VLC_EGENERIC;
 845
 846             *pi_int = 1;
 847             *ppp_title = malloc( sizeof( input_title_t**) );
 848             (*ppp_title)[0] = vlc_input_title_Duplicate( p_sys->p_title );
 849             *pi_title_offset = 0;
 850             *pi_seekpoint_offset = 0;
 851             return VLC_SUCCESS;
 852         }
 853         case DEMUX_SET_TITLE:
 854         {
 855             const int i_title = (int)va_arg( args, int );
 856             if( !p_sys->p_title || i_title != 0 )
 857                 return VLC_EGENERIC;
 858             return VLC_SUCCESS;
 859         }
 860         case DEMUX_SET_SEEKPOINT:
 861         {
 862             const int i_seekpoint = (int)va_arg( args, int );
 863             if( !p_sys->p_title )
 864                 return VLC_EGENERIC;
 865
 866             i64 = p_sys->p_title->seekpoint[i_seekpoint]->i_time_offset *
 867                   AV_TIME_BASE / 1000000 + i_start_time;
 868
 869             msg_Warn( p_demux, "DEMUX_SET_TIME: %"PRId64, i64 );
 870
 871             if( av_seek_frame( p_sys->ic, -1, i64, AVSEEK_FLAG_BACKWARD ) < 0 )
 872             {
 873                 return VLC_EGENERIC;
 874             }
 875             ResetTime( p_demux, i64 - i_start_time );
 876             return VLC_SUCCESS;
 877         }
 878
 879
 880         default:
 881             return VLC_EGENERIC;
 882     }
 883 }
 884
 885 /*****************************************************************************
 886  * I/O wrappers for libavformat
 887  *****************************************************************************/
 888 static int IORead( void *opaque, uint8_t *buf, int buf_size )
 889 {
 890     URLContext *p_url = opaque;
 891     demux_t *p_demux = p_url->priv_data;
 892     if( buf_size < 0 ) return -1;
 893     int i_ret = stream_Read( p_demux->s, buf, buf_size );
 894     return i_ret ? i_ret : -1;
 895 }
 896
 897 static int64_t IOSeek( void *opaque, int64_t offset, int whence )
 898 {
 899     URLContext *p_url = opaque;
 900     demux_t *p_demux = p_url->priv_data;
 901     int64_t i_absolute;
 902     int64_t i_size = stream_Size( p_demux->s );
 903
 904 #ifdef AVFORMAT_DEBUG
 905     msg_Warn( p_demux, "IOSeek offset: %"PRId64", whence: %i", offset, whence );
 906 #endif
 907
 908     switch( whence )
 909     {
 910 #ifdef AVSEEK_SIZE
 911         case AVSEEK_SIZE:
 912             return i_size;
 913 #endif
 914         case SEEK_SET:
 915             i_absolute = (int64_t)offset;
 916             break;
 917         case SEEK_CUR:
 918             i_absolute = stream_Tell( p_demux->s ) + (int64_t)offset;
 919             break;
 920         case SEEK_END:
 921             i_absolute = i_size + (int64_t)offset;
 922             break;
 923         default:
 924             return -1;
 925
 926     }
 927
 928     if( i_absolute < 0 )
 929     {
 930         msg_Dbg( p_demux, "Trying to seek before the beginning" );
 931         return -1;
 932     }
 933
 934     if( i_size > 0 && i_absolute >= i_size )
 935     {
 936         msg_Dbg( p_demux, "Trying to seek too far : EOF?" );
 937         return -1;
 938     }
 939
 940     if( stream_Seek( p_demux->s, i_absolute ) )
 941     {
 942         msg_Warn( p_demux, "we were not allowed to seek, or EOF " );
 943         return -1;
 944     }
 945
 946     return stream_Tell( p_demux->s );
 947 }
 948
 949 #endif /* HAVE_LIBAVFORMAT_AVFORMAT_H */