modules/demux/pva.c

   1 /*****************************************************************************
   2  * pva.c: PVA demuxer
   3  *****************************************************************************
   4  * Copyright (C) 2004 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_demux.h>
  35
  36 /*****************************************************************************
  37  * Module descriptor
  38  *****************************************************************************/
  39 static int  Open    ( vlc_object_t * );
  40 static void Close  ( vlc_object_t * );
  41
  42 vlc_module_begin ()
  43     set_description( N_("PVA demuxer" ) )
  44     set_capability( "demux", 10 )
  45     set_category( CAT_INPUT )
  46     set_subcategory( SUBCAT_INPUT_DEMUX )
  47     set_callbacks( Open, Close )
  48     add_shortcut( "pva" )
  49 vlc_module_end ()
  50
  51 /*****************************************************************************
  52  * Local prototypes
  53  *****************************************************************************/
  54
  55 struct demux_sys_t
  56 {
  57     es_out_id_t *p_video;
  58     es_out_id_t *p_audio;
  59
  60     /* counter */
  61     int          i_vc;
  62     int          i_ac;
  63
  64     /* audio/video block */
  65     block_t     *p_pes; /* audio */
  66     block_t     *p_es;  /* video */
  67
  68     int64_t     b_pcr_audio;
  69 };
  70
  71 static int  Demux   ( demux_t *p_demux );
  72 static int  Control ( demux_t *p_demux, int i_query, va_list args );
  73
  74 static int  ReSynch ( demux_t * );
  75 static void ParsePES( demux_t * );
  76
  77 /*****************************************************************************
  78  * Open
  79  *****************************************************************************/
  80 static int Open( vlc_object_t *p_this )
  81 {
  82     demux_t     *p_demux = (demux_t*)p_this;
  83     demux_sys_t *p_sys;
  84     es_format_t  fmt;
  85     const uint8_t *p_peek;
  86
  87     if( stream_Peek( p_demux->s, &p_peek, 5 ) < 5 ) return VLC_EGENERIC;
  88     if( p_peek[0] != 'A' || p_peek[1] != 'V' || p_peek[4] != 0x55 )
  89     {
  90         /* In case we had forced this demuxer we try to resynch */
  91         if( !p_demux->b_force || ReSynch( p_demux ) )
  92             return VLC_EGENERIC;
  93     }
  94
  95     /* Fill p_demux field */
  96     p_demux->pf_demux = Demux;
  97     p_demux->pf_control = Control;
  98     p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
  99
 100     /* Register one audio and one video stream */
 101     es_format_Init( &fmt, AUDIO_ES, VLC_CODEC_MPGA );
 102     fmt.b_packetized = false;
 103     p_sys->p_audio = es_out_Add( p_demux->out, &fmt );
 104
 105     es_format_Init( &fmt, VIDEO_ES, VLC_CODEC_MPGV );
 106     fmt.b_packetized = false;
 107     p_sys->p_video = es_out_Add( p_demux->out, &fmt );
 108
 109     p_sys->i_vc    = -1;
 110     p_sys->i_ac    = -1;
 111     p_sys->p_pes   = NULL;
 112     p_sys->p_es    = NULL;
 113
 114     p_sys->b_pcr_audio = false;
 115
 116     return VLC_SUCCESS;
 117 }
 118
 119 /*****************************************************************************
 120  * Close
 121  *****************************************************************************/
 122 static void Close( vlc_object_t *p_this )
 123 {
 124     demux_t     *p_demux = (demux_t*)p_this;
 125     demux_sys_t *p_sys = p_demux->p_sys;
 126
 127     if( p_sys->p_es )  block_Release( p_sys->p_es );
 128     if( p_sys->p_pes ) block_Release( p_sys->p_pes );
 129
 130     free( p_sys );
 131 }
 132
 133
 134 /*****************************************************************************
 135  * Demux:
 136  *****************************************************************************/
 137 static int Demux( demux_t *p_demux )
 138 {
 139     demux_sys_t *p_sys = p_demux->p_sys;
 140
 141     const uint8_t *p_peek;
 142     int         i_size;
 143     block_t     *p_frame;
 144     int64_t     i_pts;
 145     int         i_skip;
 146
 147     if( stream_Peek( p_demux->s, &p_peek, 8 ) < 8 )
 148     {
 149         msg_Warn( p_demux, "eof ?" );
 150         return 0;
 151     }
 152     if( p_peek[0] != 'A' || p_peek[1] != 'V' || p_peek[4] != 0x55 )
 153     {
 154         msg_Warn( p_demux, "lost synchro" );
 155         if( ReSynch( p_demux ) )
 156         {
 157             return -1;
 158         }
 159         if( stream_Peek( p_demux->s, &p_peek, 8 ) < 8 )
 160         {
 161             msg_Warn( p_demux, "eof ?" );
 162             return 0;
 163         }
 164     }
 165
 166     i_size = GetWBE( &p_peek[6] );
 167     switch( p_peek[2] )
 168     {
 169         case 0x01:  /* VideoStream */
 170             if( p_sys->i_vc < 0 )
 171             {
 172                 msg_Dbg( p_demux, "first packet for video" );
 173             }
 174             else if( ((p_sys->i_vc + 1)&0xff) != p_peek[3] )
 175             {
 176                 msg_Dbg( p_demux, "packet lost (video)" );
 177                 if( p_sys->p_es )
 178                 {
 179                     block_ChainRelease( p_sys->p_es );
 180                     p_sys->p_es = NULL;
 181                 }
 182             }
 183             p_sys->i_vc = p_peek[3];
 184
 185             /* read the PTS and potential extra bytes TODO: make it a bit more optimised */
 186             i_pts = -1;
 187             i_skip = 8;
 188             if( p_peek[5]&0x10 )
 189             {
 190                 int i_pre = p_peek[5]&0x3;
 191
 192                 if( ( p_frame = stream_Block( p_demux->s, 8 + 4 + i_pre ) ) )
 193                 {
 194                     i_pts = GetDWBE( &p_frame->p_buffer[8] );
 195                     if( p_frame->i_buffer > 12 )
 196                     {
 197                         p_frame->p_buffer += 12;
 198                         p_frame->i_buffer -= 12;
 199                         block_ChainAppend( &p_sys->p_es, p_frame );
 200                     }
 201                     else
 202                     {
 203                         block_Release( p_frame );
 204                     }
 205                 }
 206                 i_size -= 4 + i_pre;
 207                 i_skip  = 0;
 208                 /* Set PCR */
 209                 if( ( p_frame = p_sys->p_es ) )
 210                 {
 211
 212                     if( p_frame->i_pts > VLC_TS_INVALID && !p_sys->b_pcr_audio )
 213                     {
 214                         es_out_Control( p_demux->out, ES_OUT_SET_PCR, (int64_t)p_frame->i_pts);
 215                     }
 216                     es_out_Send( p_demux->out, p_sys->p_video, p_frame );
 217
 218                     p_sys->p_es = NULL;
 219                 }
 220             }
 221
 222             if( ( p_frame = stream_Block( p_demux->s, i_size + i_skip ) ) )
 223             {
 224                 p_frame->p_buffer += i_skip;
 225                 p_frame->i_buffer -= i_skip;
 226                 if( i_pts >= 0 )
 227                     p_frame->i_pts = VLC_TS_0 + i_pts * 100 / 9;
 228                 block_ChainAppend( &p_sys->p_es, p_frame );
 229             }
 230             break;
 231
 232         case 0x02:  /* MainAudioStream */
 233             if( p_sys->i_ac < 0 )
 234             {
 235                 msg_Dbg( p_demux, "first packet for audio" );
 236             }
 237             else if( ((p_sys->i_ac + 1)&0xff) != p_peek[3] )
 238             {
 239                 msg_Dbg( p_demux, "packet lost (audio)" );
 240                 if( p_sys->p_pes )
 241                 {
 242                     block_ChainRelease( p_sys->p_pes );
 243                     p_sys->p_pes = NULL;
 244                 }
 245             }
 246             p_sys->i_ac = p_peek[3];
 247
 248             if( p_peek[5]&0x10 && p_sys->p_pes )
 249             {
 250                 ParsePES( p_demux );
 251             }
 252             if( ( p_frame = stream_Block( p_demux->s, i_size + 8 ) ) )
 253             {
 254                 p_frame->p_buffer += 8;
 255                 p_frame->i_buffer -= 8;
 256                 /* XXX this a hack, some streams aren't compliant and
 257                  * doesn't set pes_start flag */
 258                 if( p_sys->p_pes && p_frame->i_buffer > 4 &&
 259                     p_frame->p_buffer[0] == 0x00 &&
 260                     p_frame->p_buffer[1] == 0x00 &&
 261                     p_frame->p_buffer[2] == 0x01 )
 262                 {
 263                     ParsePES( p_demux );
 264                 }
 265                 block_ChainAppend( &p_sys->p_pes, p_frame );
 266             }
 267             break;
 268
 269         default:
 270             msg_Warn( p_demux, "unknown id=0x%x", p_peek[2] );
 271             stream_Read( p_demux->s, NULL, i_size + 8 );
 272             break;
 273     }
 274     return 1;
 275 }
 276
 277 /*****************************************************************************
 278  * Control:
 279  *****************************************************************************/
 280 static int Control( demux_t *p_demux, int i_query, va_list args )
 281 {
 282     /* demux_sys_t *p_sys = p_demux->p_sys; */
 283     double f, *pf;
 284     int64_t i64;
 285     switch( i_query )
 286     {
 287         case DEMUX_GET_POSITION:
 288             if( ( i64 = stream_Size( p_demux->s ) ) > 0 )
 289             {
 290                 pf = (double*) va_arg( args, double* );
 291                 double current = stream_Tell( p_demux->s );
 292                 *pf = current / (double)i64;
 293                 return VLC_SUCCESS;
 294             }
 295             return VLC_EGENERIC;
 296
 297         case DEMUX_SET_POSITION:
 298             f = (double) va_arg( args, double );
 299             i64 = stream_Size( p_demux->s );
 300
 301             if( stream_Seek( p_demux->s, (int64_t)(i64 * f) ) || ReSynch( p_demux ) )
 302             {
 303                 return VLC_EGENERIC;
 304             }
 305             return VLC_SUCCESS;
 306
 307 #if 0
 308         case DEMUX_GET_TIME:
 309             pi64 = (int64_t*)va_arg( args, int64_t * );
 310             if( p_sys->i_time < 0 )
 311             {
 312                 *pi64 = 0;
 313                 return VLC_EGENERIC;
 314             }
 315             *pi64 = p_sys->i_time;
 316             return VLC_SUCCESS;
 317
 318 #if 0
 319         case DEMUX_GET_LENGTH:
 320             pi64 = (int64_t*)va_arg( args, int64_t * );
 321             if( p_sys->i_mux_rate > 0 )
 322             {
 323                 *pi64 = (int64_t)1000000 * ( stream_Size( p_demux->s ) / 50 ) / p_sys->i_mux_rate;
 324                 return VLC_SUCCESS;
 325             }
 326             *pi64 = 0;
 327             return VLC_EGENERIC;
 328
 329 #endif
 330         case DEMUX_GET_FPS:
 331             pf = (double*)va_arg( args, double * );
 332             *pf = (double)1000000.0 / (double)p_sys->i_pcr_inc;
 333             return VLC_SUCCESS;
 334 #endif
 335         case DEMUX_SET_TIME:
 336         default:
 337             return VLC_EGENERIC;
 338     }
 339 }
 340
 341 /*****************************************************************************
 342  * ReSynch:
 343  *****************************************************************************/
 344 static int ReSynch( demux_t *p_demux )
 345 {
 346     const uint8_t *p_peek;
 347     int      i_skip;
 348     int      i_peek;
 349
 350     while( vlc_object_alive (p_demux) )
 351     {
 352         if( ( i_peek = stream_Peek( p_demux->s, &p_peek, 1024 ) ) < 8 )
 353         {
 354             return VLC_EGENERIC;
 355         }
 356         i_skip = 0;
 357
 358         while( i_skip < i_peek - 5 )
 359         {
 360             if( p_peek[0] == 'A' && p_peek[1] == 'V' && p_peek[4] == 0x55 )
 361             {
 362                 if( i_skip > 0 )
 363                 {
 364                     stream_Read( p_demux->s, NULL, i_skip );
 365                 }
 366                 return VLC_SUCCESS;
 367             }
 368             p_peek++;
 369             i_skip++;
 370         }
 371
 372         stream_Read( p_demux->s, NULL, i_skip );
 373     }
 374
 375     return VLC_EGENERIC;
 376 }
 377
 378 static void ParsePES( demux_t *p_demux )
 379 {
 380     demux_sys_t *p_sys = p_demux->p_sys;
 381     block_t     *p_pes = p_sys->p_pes;
 382     uint8_t     hdr[30];
 383     int         i_pes_size;
 384
 385     unsigned    i_skip;
 386     mtime_t     i_dts = -1;
 387     mtime_t     i_pts = -1;
 388
 389     p_sys->p_pes = NULL;
 390
 391     /* FIXME find real max size */
 392     block_ChainExtract( p_pes, hdr, 30 );
 393
 394     if( hdr[0] != 0 || hdr[1] != 0 || hdr[2] != 1 )
 395     {
 396         msg_Warn( p_demux, "invalid hdr [0x%2.2x:%2.2x:%2.2x:%2.2x]",
 397                   hdr[0], hdr[1],hdr[2],hdr[3] );
 398         block_ChainRelease( p_pes );
 399         return;
 400     }
 401     i_pes_size = GetWBE( &hdr[4] );
 402
 403     /* we assume mpeg2 PES */
 404     i_skip = hdr[8] + 9;
 405     if( hdr[7]&0x80 )    /* has pts */
 406     {
 407         i_pts = ((mtime_t)(hdr[ 9]&0x0e ) << 29)|
 408                  (mtime_t)(hdr[10] << 22)|
 409                 ((mtime_t)(hdr[11]&0xfe) << 14)|
 410                  (mtime_t)(hdr[12] << 7)|
 411                  (mtime_t)(hdr[12] >> 1);
 412
 413         if( hdr[7]&0x40 )    /* has dts */
 414         {
 415              i_dts = ((mtime_t)(hdr[14]&0x0e ) << 29)|
 416                      (mtime_t)(hdr[15] << 22)|
 417                     ((mtime_t)(hdr[16]&0xfe) << 14)|
 418                      (mtime_t)(hdr[17] << 7)|
 419                      (mtime_t)(hdr[18] >> 1);
 420         }
 421     }
 422
 423     p_pes = block_ChainGather( p_pes );
 424     if( p_pes->i_buffer <= i_skip )
 425     {
 426         block_ChainRelease( p_pes );
 427         return;
 428     }
 429
 430     p_pes->i_buffer -= i_skip;
 431     p_pes->p_buffer += i_skip;
 432
 433     if( i_dts >= 0 )
 434         p_pes->i_dts = VLC_TS_0 + i_dts * 100 / 9;
 435     if( i_pts >= 0 )
 436         p_pes->i_pts = VLC_TS_0 + i_pts * 100 / 9;
 437
 438     /* Set PCR */
 439     if( p_pes->i_pts > 0 )
 440     {
 441         es_out_Control( p_demux->out, ES_OUT_SET_PCR, (int64_t)p_pes->i_pts);
 442         p_sys->b_pcr_audio = true;
 443     }
 444     es_out_Send( p_demux->out, p_sys->p_audio, p_pes );
 445 }
 446