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