git.sesse.net Git - vlc/blob - modules/demux/avformat/demux.c

   1 /*****************************************************************************
   2  * demux.c: demuxer using ffmpeg (libavformat).
   3  *****************************************************************************
   4  * Copyright (C) 2004-2009 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *          Gildas Bazin <gbazin@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <vlc_common.h>
  34 #include <vlc_demux.h>
  35 #include <vlc_stream.h>
  36 #include <vlc_meta.h>
  37 #include <vlc_input.h>
  38 #include <vlc_charset.h>
  39 #include <vlc_avcodec.h>
  40
  41 /* ffmpeg header */
  42 #if defined(HAVE_LIBAVFORMAT_AVFORMAT_H)
  43 #   include <libavformat/avformat.h>
  44 #elif defined(HAVE_FFMPEG_AVFORMAT_H)
  45 #   include <ffmpeg/avformat.h>
  46 #endif
  47
  48 #include "../../codec/avcodec/avcodec.h"
  49 #include "avformat.h"
  50 #include "../xiph.h"
  51 #include "../vobsub.h"
  52
  53 //#define AVFORMAT_DEBUG 1
  54
  55 /* Version checking */
  56 #if defined(HAVE_FFMPEG_AVFORMAT_H) || defined(HAVE_LIBAVFORMAT_AVFORMAT_H)
  57
  58 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(50<<8)+0) )
  59 #   define HAVE_FFMPEG_CODEC_ATTACHMENT 1
  60 #endif
  61
  62 #if (LIBAVFORMAT_VERSION_INT >= ((52<<16)+(15<<8)+0) )
  63 #   define HAVE_FFMPEG_CHAPTERS 1
  64 #endif
  65
  66 /*****************************************************************************
  67  * demux_sys_t: demux descriptor
  68  *****************************************************************************/
  69 struct demux_sys_t
  70 {
  71     ByteIOContext   io;
  72     int             io_buffer_size;
  73     uint8_t        *io_buffer;
  74
  75     AVInputFormat  *fmt;
  76     AVFormatContext *ic;
  77     URLContext     url;
  78     URLProtocol    prot;
  79
  80     int             i_tk;
  81     es_out_id_t     **tk;
  82
  83     int64_t     i_pcr;
  84     int64_t     i_pcr_inc;
  85     int         i_pcr_tk;
  86
  87     unsigned    i_ssa_order;
  88
  89     int                i_attachments;
  90     input_attachment_t **attachments;
  91
  92     /* Only one title with seekpoints possible atm. */
  93     input_title_t *p_title;
  94 };
  95
  96 /*****************************************************************************
  97  * Local prototypes
  98  *****************************************************************************/
  99 static int Demux  ( demux_t *p_demux );
 100 static int Control( demux_t *p_demux, int i_query, va_list args );
 101
 102 static int IORead( void *opaque, uint8_t *buf, int buf_size );
 103 static int64_t IOSeek( void *opaque, int64_t offset, int whence );
 104
 105 static block_t *BuildSsaFrame( const AVPacket *p_pkt, unsigned i_order );
 106 static void UpdateSeekPoint( demux_t *p_demux, int64_t i_time );
 107
 108 /*****************************************************************************
 109  * Open
 110  *****************************************************************************/
 111 int OpenDemux( vlc_object_t *p_this )
 112 {
 113     demux_t       *p_demux = (demux_t*)p_this;
 114     demux_sys_t   *p_sys;
 115     AVProbeData   pd;
 116     AVInputFormat *fmt;
 117     unsigned int  i;
 118     int64_t       i_start_time = -1;
 119     bool          b_can_seek;
 120
 121     /* Init Probe data */
 122     pd.filename = p_demux->psz_path;
 123     if( ( pd.buf_size = stream_Peek( p_demux->s, &pd.buf, 2048 + 213 ) ) <= 0 )
 124     {
 125         msg_Warn( p_demux, "cannot peek" );
 126         return VLC_EGENERIC;
 127     }
 128
 129     vlc_avcodec_lock();
 130     av_register_all(); /* Can be called several times */
 131     vlc_avcodec_unlock();
 132
 133     /* Guess format */
 134     if( !( fmt = av_probe_input_format( &pd, 1 ) ) )
 135     {
 136         msg_Dbg( p_demux, "couldn't guess format" );
 137         return VLC_EGENERIC;
 138     }
 139
 140     /* Don't try to handle MPEG unless forced */
 141     if( !p_demux->b_force &&
 142         ( !strcmp( fmt->name, "mpeg" ) ||
 143           !strcmp( fmt->name, "vcd" ) ||
 144           !strcmp( fmt->name, "vob" ) ||
 145           !strcmp( fmt->name, "mpegts" ) ||
 146           /* libavformat's redirector won't work */
 147           !strcmp( fmt->name, "redir" ) ||
 148           !strcmp( fmt->name, "sdp" ) ) )
 149     {
 150         return VLC_EGENERIC;
 151     }
 152
 153     /* Don't trigger false alarms on bin files */
 154     if( !p_demux->b_force && !strcmp( fmt->name, "psxstr" ) )
 155     {
 156         int i_len;
 157
 158         if( !p_demux->psz_path ) return VLC_EGENERIC;
 159
 160         i_len = strlen( p_demux->psz_path );
 161         if( i_len < 4 ) return VLC_EGENERIC;
 162
 163         if( strcasecmp( &p_demux->psz_path[i_len - 4], ".str" ) &&
 164             strcasecmp( &p_demux->psz_path[i_len - 4], ".xai" ) &&
 165             strcasecmp( &p_demux->psz_path[i_len - 3], ".xa" ) )
 166         {
 167             return VLC_EGENERIC;
 168         }
 169     }
 170
 171     msg_Dbg( p_demux, "detected format: %s", fmt->name );
 172
 173     /* Fill p_demux fields */
 174     p_demux->pf_demux = Demux;
 175     p_demux->pf_control = Control;
 176     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
 177     p_sys->ic = 0;
 178     p_sys->fmt = fmt;
 179     p_sys->i_tk = 0;
 180     p_sys->tk = NULL;
 181     p_sys->i_pcr_tk = -1;
 182     p_sys->i_pcr = -1;
 183     p_sys->i_ssa_order = 0;
 184     TAB_INIT( p_sys->i_attachments, p_sys->attachments);
 185     p_sys->p_title = NULL;
 186
 187     /* Create I/O wrapper */
 188     p_sys->io_buffer_size = 32768;  /* FIXME */
 189     p_sys->io_buffer = malloc( p_sys->io_buffer_size );
 190     p_sys->url.priv_data = p_demux;
 191     p_sys->url.prot = &p_sys->prot;
 192     p_sys->url.prot->name = "VLC I/O wrapper";
 193     p_sys->url.prot->url_open = 0;
 194     p_sys->url.prot->url_read =
 195                     (int (*) (URLContext *, unsigned char *, int))IORead;
 196     p_sys->url.prot->url_write = 0;
 197     p_sys->url.prot->url_seek =
 198                     (int64_t (*) (URLContext *, int64_t, int))IOSeek;
 199     p_sys->url.prot->url_close = 0;
 200     p_sys->url.prot->next = 0;
 201     init_put_byte( &p_sys->io, p_sys->io_buffer, p_sys->io_buffer_size,
 202                    0, &p_sys->url, IORead, NULL, IOSeek );
 203
 204     stream_Control( p_demux->s, STREAM_CAN_SEEK, &b_can_seek );
 205     if( !b_can_seek )
 206     {
 207        /* Tell avformat that input is stream, so it doesn't get stuck
 208        when trying av_find_stream_info() trying to seek all the wrong places
 209        init_put_byte defaults io.is_streamed=0, so thats why we set them after it
 210        */
 211        p_sys->url.is_streamed = 1;
 212        p_sys->io.is_streamed = 1;
 213     }
 214
 215
 216     /* Open it */
 217     if( av_open_input_stream( &p_sys->ic, &p_sys->io, p_demux->psz_path,
 218                               p_sys->fmt, NULL ) )
 219     {
 220         msg_Err( p_demux, "av_open_input_stream failed" );
 221         CloseDemux( p_this );
 222         return VLC_EGENERIC;
 223     }
 224
 225     vlc_avcodec_lock(); /* avformat calls avcodec behind our back!!! */
 226     if( av_find_stream_info( p_sys->ic ) < 0 )
 227     {
 228         msg_Warn( p_demux, "av_find_stream_info failed" );
 229     }
 230     vlc_avcodec_unlock();
 231
 232     for( i = 0; i < p_sys->ic->nb_streams; i++ )
 233     {
 234         AVStream *s = p_sys->ic->streams[i];
 235         AVCodecContext *cc = s->codec;
 236
 237         es_out_id_t  *es;
 238         es_format_t  fmt;
 239         vlc_fourcc_t fcc;
 240         const char *psz_type = "unknown";
 241
 242         if( !GetVlcFourcc( cc->codec_id, NULL, &fcc, NULL ) )
 243             fcc = VLC_FOURCC( 'u', 'n', 'd', 'f' );
 244
 245         switch( cc->codec_type )
 246         {
 247         case CODEC_TYPE_AUDIO:
 248             es_format_Init( &fmt, AUDIO_ES, fcc );
 249             fmt.i_bitrate = cc->bit_rate;
 250             fmt.audio.i_channels = cc->channels;
 251             fmt.audio.i_rate = cc->sample_rate;
 252 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
 253             fmt.audio.i_bitspersample = cc->bits_per_sample;
 254 #else
 255             fmt.audio.i_bitspersample = cc->bits_per_coded_sample;
 256 #endif
 257             fmt.audio.i_blockalign = cc->block_align;
 258             psz_type = "audio";
 259             break;
 260
 261         case CODEC_TYPE_VIDEO:
 262             es_format_Init( &fmt, VIDEO_ES, fcc );
 263
 264             /* Special case for raw video data */
 265             if( cc->codec_id == CODEC_ID_RAWVIDEO )
 266             {
 267                 msg_Dbg( p_demux, "raw video, pixel format: %i", cc->pix_fmt );
 268                 if( GetVlcChroma( &fmt.video, cc->pix_fmt ) != VLC_SUCCESS)
 269                 {
 270                     msg_Err( p_demux, "was unable to find a FourCC match for raw video" );
 271                 }
 272                 else
 273                     fmt.i_codec = fmt.video.i_chroma;
 274             }
 275
 276             fmt.video.i_width = cc->width;
 277             fmt.video.i_height = cc->height;
 278             if( cc->palctrl )
 279             {
 280                 fmt.video.p_palette = malloc( sizeof(video_palette_t) );
 281                 *fmt.video.p_palette = *(video_palette_t *)cc->palctrl;
 282             }
 283             psz_type = "video";
 284             break;
 285
 286         case CODEC_TYPE_SUBTITLE:
 287             es_format_Init( &fmt, SPU_ES, fcc );
 288             if( strncmp( p_sys->ic->iformat->name, "matroska", 8 ) == 0 &&
 289                 cc->codec_id == CODEC_ID_DVD_SUBTITLE &&
 290                 cc->extradata != NULL &&
 291                 cc->extradata_size > 0 )
 292             {
 293                 char *psz_start;
 294                 char *psz_buf = malloc( cc->extradata_size + 1);
 295                 if( psz_buf != NULL )
 296                 {
 297                     memcpy( psz_buf, cc->extradata , cc->extradata_size );
 298                     psz_buf[cc->extradata_size] = '\0';
 299
 300                     psz_start = strstr( psz_buf, "size:" );
 301                     if( psz_start &&
 302                         vobsub_size_parse( psz_start,
 303                                            &fmt.subs.spu.i_original_frame_width,
 304                                            &fmt.subs.spu.i_original_frame_height ) == VLC_SUCCESS )
 305                     {
 306                         msg_Dbg( p_demux, "original frame size: %dx%d",
 307                                  fmt.subs.spu.i_original_frame_width,
 308                                  fmt.subs.spu.i_original_frame_height );
 309                     }
 310                     else
 311                     {
 312                         msg_Warn( p_demux, "reading original frame size failed" );
 313                     }
 314
 315                     psz_start = strstr( psz_buf, "palette:" );
 316                     if( psz_start &&
 317                         vobsub_palette_parse( psz_start, &fmt.subs.spu.palette[1] ) == VLC_SUCCESS )
 318                     {
 319                         fmt.subs.spu.palette[0] =  0xBeef;
 320                         msg_Dbg( p_demux, "vobsub palette read" );
 321                     }
 322                     else
 323                     {
 324                         msg_Warn( p_demux, "reading original palette failed" );
 325                     }
 326                     free( psz_buf );
 327                 }
 328             }
 329
 330             psz_type = "subtitle";
 331             break;
 332
 333         default:
 334             es_format_Init( &fmt, UNKNOWN_ES, 0 );
 335 #ifdef HAVE_FFMPEG_CODEC_ATTACHMENT
 336             if( cc->codec_type == CODEC_TYPE_ATTACHMENT )
 337             {
 338                 input_attachment_t *p_attachment;
 339                 psz_type = "attachment";
 340                 if( cc->codec_id == CODEC_ID_TTF )
 341                 {
 342                     p_attachment = vlc_input_attachment_New( s->filename, "application/x-truetype-font", NULL,
 343                                              cc->extradata, (int)cc->extradata_size );
 344                     TAB_APPEND( p_sys->i_attachments, p_sys->attachments, p_attachment );
 345                 }
 346                 else msg_Warn( p_demux, "unsupported attachment type in ffmpeg demux" );
 347             }
 348             break;
 349 #endif
 350
 351             if( cc->codec_type == CODEC_TYPE_DATA )
 352                 psz_type = "data";
 353
 354             msg_Warn( p_demux, "unsupported track type in ffmpeg demux" );
 355             break;
 356         }
 357         fmt.psz_language = strdup( s->language );
 358         if( s->disposition & AV_DISPOSITION_DEFAULT )
 359             fmt.i_priority = 1000;
 360
 361 #ifdef HAVE_FFMPEG_CODEC_ATTACHMENT
 362         if( cc->codec_type != CODEC_TYPE_ATTACHMENT )
 363 #endif
 364         {
 365             const bool    b_ogg = !strcmp( p_sys->fmt->name, "ogg" );
 366             const uint8_t *p_extra = cc->extradata;
 367             unsigned      i_extra  = cc->extradata_size;
 368
 369             if( cc->codec_id == CODEC_ID_THEORA && b_ogg )
 370             {
 371                 unsigned pi_size[3];
 372                 void     *pp_data[3];
 373                 unsigned i_count;
 374                 for( i_count = 0; i_count < 3; i_count++ )
 375                 {
 376                     if( i_extra < 2 )
 377                         break;
 378                     pi_size[i_count] = GetWBE( p_extra );
 379                     pp_data[i_count] = (uint8_t*)&p_extra[2];
 380                     if( i_extra < pi_size[i_count] + 2 )
 381                         break;
 382
 383                     p_extra += 2 + pi_size[i_count];
 384                     i_extra -= 2 + pi_size[i_count];
 385                 }
 386                 if( i_count > 0 && xiph_PackHeaders( &fmt.i_extra, &fmt.p_extra,
 387                                                      pi_size, pp_data, i_count ) )
 388                 {
 389                     fmt.i_extra = 0;
 390                     fmt.p_extra = NULL;
 391                 }
 392             }
 393             else if( cc->codec_id == CODEC_ID_SPEEX && b_ogg )
 394             {
 395                 uint8_t p_dummy_comment[] = {
 396                     0, 0, 0, 0,
 397                     0, 0, 0, 0,
 398                 };
 399                 unsigned pi_size[2];
 400                 void     *pp_data[2];
 401
 402                 pi_size[0] = i_extra;
 403                 pp_data[0] = (uint8_t*)p_extra;
 404
 405                 pi_size[1] = sizeof(p_dummy_comment);
 406                 pp_data[1] = p_dummy_comment;
 407
 408                 if( pi_size[0] > 0 && xiph_PackHeaders( &fmt.i_extra, &fmt.p_extra,
 409                                                         pi_size, pp_data, 2 ) )
 410                 {
 411                     fmt.i_extra = 0;
 412                     fmt.p_extra = NULL;
 413                 }
 414             }
 415             else if( cc->extradata_size > 0 )
 416             {
 417                 fmt.p_extra = malloc( i_extra );
 418                 if( fmt.p_extra )
 419                 {
 420                     fmt.i_extra = i_extra;
 421                     memcpy( fmt.p_extra, p_extra, i_extra );
 422                 }
 423             }
 424         }
 425         es = es_out_Add( p_demux->out, &fmt );
 426         if( s->disposition & AV_DISPOSITION_DEFAULT )
 427             es_out_Control( p_demux->out, ES_OUT_SET_ES_DEFAULT, es );
 428         es_format_Clean( &fmt );
 429
 430         msg_Dbg( p_demux, "adding es: %s codec = %4.4s",
 431                  psz_type, (char*)&fcc );
 432         TAB_APPEND( p_sys->i_tk, p_sys->tk, es );
 433     }
 434     if( p_sys->ic->start_time != (int64_t)AV_NOPTS_VALUE )
 435         i_start_time = p_sys->ic->start_time * 1000000 / AV_TIME_BASE;
 436
 437     msg_Dbg( p_demux, "AVFormat supported stream" );
 438     msg_Dbg( p_demux, "    - format = %s (%s)",
 439              p_sys->fmt->name, p_sys->fmt->long_name );
 440     msg_Dbg( p_demux, "    - start time = %"PRId64, i_start_time );
 441     msg_Dbg( p_demux, "    - duration = %"PRId64,
 442              ( p_sys->ic->duration != (int64_t)AV_NOPTS_VALUE ) ?
 443              p_sys->ic->duration * 1000000 / AV_TIME_BASE : -1 );
 444
 445 #ifdef HAVE_FFMPEG_CHAPTERS
 446     if( p_sys->ic->nb_chapters > 0 )
 447         p_sys->p_title = vlc_input_title_New();
 448     for( i = 0; i < p_sys->ic->nb_chapters; i++ )
 449     {
 450         seekpoint_t *s = vlc_seekpoint_New();
 451
 452         if( p_sys->ic->chapters[i]->title )
 453         {
 454             s->psz_name = strdup( p_sys->ic->chapters[i]->title );
 455             EnsureUTF8( s->psz_name );
 456             msg_Dbg( p_demux, "    - chapter %d: %s", i, s->psz_name );
 457         }
 458         s->i_time_offset = p_sys->ic->chapters[i]->start * 1000000 *
 459             p_sys->ic->chapters[i]->time_base.num /
 460             p_sys->ic->chapters[i]->time_base.den -
 461             (i_start_time != -1 ? i_start_time : 0 );
 462         TAB_APPEND( p_sys->p_title->i_seekpoint, p_sys->p_title->seekpoint, s );
 463     }
 464 #endif
 465
 466     return VLC_SUCCESS;
 467 }
 468
 469 /*****************************************************************************
 470  * Close
 471  *****************************************************************************/
 472 void CloseDemux( vlc_object_t *p_this )
 473 {
 474     demux_t     *p_demux = (demux_t*)p_this;
 475     demux_sys_t *p_sys = p_demux->p_sys;
 476
 477     FREENULL( p_sys->tk );
 478
 479     if( p_sys->ic ) av_close_input_stream( p_sys->ic );
 480
 481     for( int i = 0; i < p_sys->i_attachments; i++ )
 482         free( p_sys->attachments[i] );
 483     TAB_CLEAN( p_sys->i_attachments, p_sys->attachments);
 484
 485     if( p_sys->p_title )
 486         vlc_input_title_Delete( p_sys->p_title );
 487
 488     free( p_sys->io_buffer );
 489     free( p_sys );
 490 }
 491
 492 /*****************************************************************************
 493  * Demux:
 494  *****************************************************************************/
 495 static int Demux( demux_t *p_demux )
 496 {
 497     demux_sys_t *p_sys = p_demux->p_sys;
 498     AVPacket    pkt;
 499     block_t     *p_frame;
 500     int64_t     i_start_time;
 501
 502     /* Read a frame */
 503     if( av_read_frame( p_sys->ic, &pkt ) )
 504     {
 505         return 0;
 506     }
 507     if( pkt.stream_index < 0 || pkt.stream_index >= p_sys->i_tk )
 508     {
 509         av_free_packet( &pkt );
 510         return 1;
 511     }
 512     const AVStream *p_stream = p_sys->ic->streams[pkt.stream_index];
 513     if( p_stream->time_base.den <= 0 )
 514     {
 515         msg_Warn( p_demux, "Invalid time base for the stream %d", pkt.stream_index );
 516         av_free_packet( &pkt );
 517         return 1;
 518     }
 519     if( p_stream->codec->codec_id == CODEC_ID_SSA )
 520     {
 521         p_frame = BuildSsaFrame( &pkt, p_sys->i_ssa_order++ );
 522         if( !p_frame )
 523         {
 524             av_free_packet( &pkt );
 525             return 1;
 526         }
 527     }
 528     else
 529     {
 530         if( ( p_frame = block_New( p_demux, pkt.size ) ) == NULL )
 531         {
 532             av_free_packet( &pkt );
 533             return 0;
 534         }
 535         memcpy( p_frame->p_buffer, pkt.data, pkt.size );
 536     }
 537
 538     if( pkt.flags & PKT_FLAG_KEY )
 539         p_frame->i_flags |= BLOCK_FLAG_TYPE_I;
 540
 541     i_start_time = ( p_sys->ic->start_time != (int64_t)AV_NOPTS_VALUE ) ?
 542         ( p_sys->ic->start_time * 1000000 / AV_TIME_BASE )  : 0;
 543
 544     p_frame->i_dts = ( pkt.dts == (int64_t)AV_NOPTS_VALUE ) ?
 545         VLC_TS_INVALID : (pkt.dts) * 1000000 *
 546         p_stream->time_base.num /
 547         p_stream->time_base.den - i_start_time + VLC_TS_0;
 548     p_frame->i_pts = ( pkt.pts == (int64_t)AV_NOPTS_VALUE ) ?
 549         VLC_TS_INVALID : (pkt.pts) * 1000000 *
 550         p_stream->time_base.num /
 551         p_stream->time_base.den - i_start_time + VLC_TS_0;
 552     if( pkt.duration > 0 && p_frame->i_length <= 0 )
 553         p_frame->i_length = pkt.duration * 1000000 *
 554             p_stream->time_base.num /
 555             p_stream->time_base.den;
 556
 557     if( pkt.dts != AV_NOPTS_VALUE && pkt.dts == pkt.pts &&
 558         p_stream->codec->codec_type == CODEC_TYPE_VIDEO )
 559     {
 560         /* Add here notoriously bugged file formats/samples regarding PTS */
 561         if( !strcmp( p_sys->fmt->name, "flv" ) )
 562             p_frame->i_pts = VLC_TS_INVALID;
 563     }
 564 #ifdef AVFORMAT_DEBUG
 565     msg_Dbg( p_demux, "tk[%d] dts=%"PRId64" pts=%"PRId64,
 566              pkt.stream_index, p_frame->i_dts, p_frame->i_pts );
 567 #endif
 568
 569     if( p_frame->i_dts > VLC_TS_INVALID  &&
 570         ( pkt.stream_index == p_sys->i_pcr_tk || p_sys->i_pcr_tk < 0 ) )
 571     {
 572         p_sys->i_pcr_tk = pkt.stream_index;
 573         p_sys->i_pcr = p_frame->i_dts;
 574
 575         es_out_Control( p_demux->out, ES_OUT_SET_PCR, (int64_t)p_sys->i_pcr );
 576     }
 577
 578     es_out_Send( p_demux->out, p_sys->tk[pkt.stream_index], p_frame );
 579
 580     UpdateSeekPoint( p_demux, p_sys->i_pcr);
 581     av_free_packet( &pkt );
 582     return 1;
 583 }
 584
 585 static void UpdateSeekPoint( demux_t *p_demux, int64_t i_time )
 586 {
 587     demux_sys_t *p_sys = p_demux->p_sys;
 588     int i;
 589
 590     if( !p_sys->p_title )
 591         return;
 592
 593     for( i = 0; i < p_sys->p_title->i_seekpoint; i++ )
 594     {
 595         if( i_time < p_sys->p_title->seekpoint[i]->i_time_offset )
 596             break;
 597     }
 598     i--;
 599
 600     if( i != p_demux->info.i_seekpoint && i >= 0 )
 601     {
 602         p_demux->info.i_seekpoint = i;
 603         p_demux->info.i_update |= INPUT_UPDATE_SEEKPOINT;
 604     }
 605 }
 606
 607 static block_t *BuildSsaFrame( const AVPacket *p_pkt, unsigned i_order )
 608 {
 609     if( p_pkt->size <= 0 )
 610         return NULL;
 611
 612     char buffer[256];
 613     const size_t i_buffer_size = __MIN( sizeof(buffer) - 1, p_pkt->size );
 614     memcpy( buffer, p_pkt->data, i_buffer_size );
 615     buffer[i_buffer_size] = '\0';
 616
 617     /* */
 618     int i_layer;
 619     int h0, m0, s0, c0;
 620     int h1, m1, s1, c1;
 621     int i_position = 0;
 622     if( sscanf( buffer, "Dialogue: %d,%d:%d:%d.%d,%d:%d:%d.%d,%n", &i_layer,
 623                 &h0, &m0, &s0, &c0, &h1, &m1, &s1, &c1, &i_position ) < 9 )
 624         return NULL;
 625     if( i_position <= 0 || i_position >= i_buffer_size )
 626         return NULL;
 627
 628     char *p;
 629     if( asprintf( &p, "%u,%d,%.*s", i_order, i_layer, p_pkt->size - i_position, p_pkt->data + i_position ) < 0 )
 630         return NULL;
 631
 632     block_t *p_frame = block_heap_Alloc( p, p, strlen(p) + 1 );
 633     if( p_frame )
 634         p_frame->i_length = CLOCK_FREQ * ((h1 - h1) * 3600 +
 635                                           (m1-m0) * 60 +
 636                                           (s1-s0) * 1) +
 637                             CLOCK_FREQ * (c1-c0) / 100;
 638     return p_frame;
 639 }
 640
 641 /*****************************************************************************
 642  * Control:
 643  *****************************************************************************/
 644 static int Control( demux_t *p_demux, int i_query, va_list args )
 645 {
 646     demux_sys_t *p_sys = p_demux->p_sys;
 647     double f, *pf;
 648     int64_t i64, *pi64;
 649
 650     switch( i_query )
 651     {
 652         case DEMUX_GET_POSITION:
 653             pf = (double*) va_arg( args, double* ); *pf = 0.0;
 654             i64 = stream_Size( p_demux->s );
 655             if( i64 > 0 )
 656             {
 657                 double current = stream_Tell( p_demux->s );
 658                 *pf = current / (double)i64;
 659             }
 660
 661             if( (p_sys->ic->duration != (int64_t)AV_NOPTS_VALUE) && (p_sys->i_pcr > 0) )
 662             {
 663                 *pf = (double)p_sys->i_pcr / (double)p_sys->ic->duration;
 664             }
 665
 666             return VLC_SUCCESS;
 667
 668         case DEMUX_SET_POSITION:
 669             f = (double) va_arg( args, double );
 670             if( p_sys->i_pcr > 0 )
 671             {
 672                 i64 = p_sys->ic->duration * f;
 673                 if( p_sys->ic->start_time != (int64_t)AV_NOPTS_VALUE )
 674                     i64 += p_sys->ic->start_time;
 675
 676                 msg_Warn( p_demux, "DEMUX_SET_POSITION: %"PRId64, i64 );
 677
 678                 /* If we have a duration, we prefer to seek by time
 679                    but if we don't, or if the seek fails, try BYTE seeking */
 680                 if( p_sys->ic->duration == (int64_t)AV_NOPTS_VALUE ||
 681                     (av_seek_frame( p_sys->ic, -1, i64, 0 ) < 0) )
 682                 {
 683                     int64_t i_size = stream_Size( p_demux->s );
 684                     i64 = (i_size * f);
 685
 686                     msg_Warn( p_demux, "DEMUX_SET_BYTE_POSITION: %"PRId64, i64 );
 687                     if( av_seek_frame( p_sys->ic, -1, i64, AVSEEK_FLAG_BYTE ) < 0 )
 688                         return VLC_EGENERIC;
 689                 }
 690                 else
 691                 {
 692                     UpdateSeekPoint( p_demux, i64 );
 693                 }
 694                 p_sys->i_pcr = -1; /* Invalidate time display */
 695             }
 696             return VLC_SUCCESS;
 697
 698         case DEMUX_GET_LENGTH:
 699             pi64 = (int64_t*)va_arg( args, int64_t * );
 700             if( p_sys->ic->duration != (int64_t)AV_NOPTS_VALUE )
 701                 *pi64 = p_sys->ic->duration * 1000000 / AV_TIME_BASE;
 702             else
 703                 *pi64 = 0;
 704             return VLC_SUCCESS;
 705
 706         case DEMUX_GET_TIME:
 707             pi64 = (int64_t*)va_arg( args, int64_t * );
 708             *pi64 = p_sys->i_pcr;
 709             return VLC_SUCCESS;
 710
 711         case DEMUX_SET_TIME:
 712             i64 = (int64_t)va_arg( args, int64_t );
 713             i64 = i64 *AV_TIME_BASE / 1000000;
 714             if( p_sys->ic->start_time != (int64_t)AV_NOPTS_VALUE )
 715                 i64 += p_sys->ic->start_time;
 716
 717             msg_Warn( p_demux, "DEMUX_SET_TIME: %"PRId64, i64 );
 718
 719             if( av_seek_frame( p_sys->ic, -1, i64, 0 ) < 0 )
 720             {
 721                 return VLC_EGENERIC;
 722             }
 723             p_sys->i_pcr = -1; /* Invalidate time display */
 724             UpdateSeekPoint( p_demux, i64 );
 725             return VLC_SUCCESS;
 726
 727         case DEMUX_HAS_UNSUPPORTED_META:
 728         {
 729             bool *pb_bool = (bool*)va_arg( args, bool* );
 730             *pb_bool = true;
 731             return VLC_SUCCESS;
 732         }
 733
 734
 735         case DEMUX_GET_META:
 736         {
 737             vlc_meta_t *p_meta = (vlc_meta_t*)va_arg( args, vlc_meta_t* );
 738
 739             if( !p_sys->ic->title[0] || !p_sys->ic->author[0] ||
 740                 !p_sys->ic->copyright[0] || !p_sys->ic->comment[0] ||
 741                 /*!p_sys->ic->album[0] ||*/ !p_sys->ic->genre[0] )
 742             {
 743                 return VLC_EGENERIC;
 744             }
 745
 746             if( p_sys->ic->title[0] )
 747                 vlc_meta_SetTitle( p_meta, p_sys->ic->title );
 748             if( p_sys->ic->author[0] )
 749                 vlc_meta_SetArtist( p_meta, p_sys->ic->author );
 750             if( p_sys->ic->copyright[0] )
 751                 vlc_meta_SetCopyright( p_meta, p_sys->ic->copyright );
 752             if( p_sys->ic->comment[0] )
 753                 vlc_meta_SetDescription( p_meta, p_sys->ic->comment );
 754             if( p_sys->ic->genre[0] )
 755                 vlc_meta_SetGenre( p_meta, p_sys->ic->genre );
 756             return VLC_SUCCESS;
 757         }
 758
 759         case DEMUX_GET_ATTACHMENTS:
 760         {
 761             input_attachment_t ***ppp_attach =
 762                 (input_attachment_t***)va_arg( args, input_attachment_t*** );
 763             int *pi_int = (int*)va_arg( args, int * );
 764             int i;
 765
 766             if( p_sys->i_attachments <= 0 )
 767                 return VLC_EGENERIC;
 768
 769             *pi_int = p_sys->i_attachments;;
 770             *ppp_attach = malloc( sizeof(input_attachment_t**) * p_sys->i_attachments );
 771             for( i = 0; i < p_sys->i_attachments; i++ )
 772                 (*ppp_attach)[i] = vlc_input_attachment_Duplicate( p_sys->attachments[i] );
 773             return VLC_SUCCESS;
 774         }
 775
 776         case DEMUX_GET_TITLE_INFO:
 777         {
 778             input_title_t ***ppp_title = (input_title_t***)va_arg( args, input_title_t*** );
 779             int *pi_int    = (int*)va_arg( args, int* );
 780             int *pi_title_offset = (int*)va_arg( args, int* );
 781             int *pi_seekpoint_offset = (int*)va_arg( args, int* );
 782
 783             if( !p_sys->p_title )
 784                 return VLC_EGENERIC;
 785
 786             *pi_int = 1;
 787             *ppp_title = malloc( sizeof( input_title_t**) );
 788             (*ppp_title)[0] = vlc_input_title_Duplicate( p_sys->p_title );
 789             *pi_title_offset = 0;
 790             *pi_seekpoint_offset = 0;
 791             return VLC_SUCCESS;
 792         }
 793         case DEMUX_SET_TITLE:
 794         {
 795             const int i_title = (int)va_arg( args, int );
 796             if( !p_sys->p_title || i_title != 0 )
 797                 return VLC_EGENERIC;
 798             return VLC_SUCCESS;
 799         }
 800         case DEMUX_SET_SEEKPOINT:
 801         {
 802             const int i_seekpoint = (int)va_arg( args, int );
 803             if( !p_sys->p_title )
 804                 return VLC_EGENERIC;
 805
 806             i64 = p_sys->p_title->seekpoint[i_seekpoint]->i_time_offset *AV_TIME_BASE / 1000000;
 807             if( p_sys->ic->start_time != (int64_t)AV_NOPTS_VALUE )
 808                 i64 += p_sys->ic->start_time;
 809
 810             msg_Warn( p_demux, "DEMUX_SET_TIME: %"PRId64, i64 );
 811
 812             if( av_seek_frame( p_sys->ic, -1, i64, 0 ) < 0 )
 813             {
 814                 return VLC_EGENERIC;
 815             }
 816             p_sys->i_pcr = -1; /* Invalidate time display */
 817             UpdateSeekPoint( p_demux, i64 );
 818             return VLC_SUCCESS;
 819         }
 820
 821
 822         default:
 823             return VLC_EGENERIC;
 824     }
 825 }
 826
 827 /*****************************************************************************
 828  * I/O wrappers for libavformat
 829  *****************************************************************************/
 830 static int IORead( void *opaque, uint8_t *buf, int buf_size )
 831 {
 832     URLContext *p_url = opaque;
 833     demux_t *p_demux = p_url->priv_data;
 834     if( buf_size < 0 ) return -1;
 835     int i_ret = stream_Read( p_demux->s, buf, buf_size );
 836     return i_ret ? i_ret : -1;
 837 }
 838
 839 static int64_t IOSeek( void *opaque, int64_t offset, int whence )
 840 {
 841     URLContext *p_url = opaque;
 842     demux_t *p_demux = p_url->priv_data;
 843     int64_t i_absolute;
 844     int64_t i_size = stream_Size( p_demux->s );
 845
 846 #ifdef AVFORMAT_DEBUG
 847     msg_Warn( p_demux, "IOSeek offset: %"PRId64", whence: %i", offset, whence );
 848 #endif
 849
 850     switch( whence )
 851     {
 852 #ifdef AVSEEK_SIZE
 853         case AVSEEK_SIZE:
 854             return i_size;
 855 #endif
 856         case SEEK_SET:
 857             i_absolute = (int64_t)offset;
 858             break;
 859         case SEEK_CUR:
 860             i_absolute = stream_Tell( p_demux->s ) + (int64_t)offset;
 861             break;
 862         case SEEK_END:
 863             i_absolute = i_size + (int64_t)offset;
 864             break;
 865         default:
 866             return -1;
 867
 868     }
 869
 870     if( i_absolute < 0 )
 871     {
 872         msg_Dbg( p_demux, "Trying to seek before the beginning" );
 873         return -1;
 874     }
 875
 876     if( i_size > 0 && i_absolute >= i_size )
 877     {
 878         msg_Dbg( p_demux, "Trying to seek too far : EOF?" );
 879         return -1;
 880     }
 881
 882     if( stream_Seek( p_demux->s, i_absolute ) )
 883     {
 884         msg_Warn( p_demux, "we were not allowed to seek, or EOF " );
 885         return -1;
 886     }
 887
 888     return stream_Tell( p_demux->s );
 889 }
 890
 891 #endif /* HAVE_LIBAVFORMAT_AVFORMAT_H */