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