git.sesse.net Git - vlc/blob - modules/codec/ffmpeg/ffmpeg.c

   1 /*****************************************************************************
   2  * ffmpeg.c: video decoder using ffmpeg library
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 VideoLAN
   5  * $Id: ffmpeg.c,v 1.1 2002/08/04 17:23:42 sam Exp $
   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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <stdlib.h>                                      /* malloc(), free() */
  28
  29 #include <vlc/vlc.h>
  30 #include <vlc/vout.h>
  31 #include <vlc/decoder.h>
  32 #include <vlc/input.h>
  33
  34 #ifdef HAVE_UNISTD_H
  35 #include <unistd.h>                                              /* getpid() */
  36 #endif
  37
  38 #include <errno.h>
  39 #include <string.h>
  40
  41 #ifdef HAVE_SYS_TIMES_H
  42 #   include <sys/times.h>
  43 #endif
  44
  45 #include "vdec_ext-plugins.h"
  46 #include "avcodec.h"                                            /* ffmpeg */
  47 #include "ffmpeg.h"
  48
  49 /*
  50  * Local prototypes
  51  */
  52 static int      OpenDecoder     ( vlc_object_t * );
  53 static int      RunDecoder      ( decoder_fifo_t * );
  54 static int      InitThread      ( videodec_thread_t * );
  55 static void     EndThread       ( videodec_thread_t * );
  56 static void     DecodeThread    ( videodec_thread_t * );
  57
  58
  59 static int      b_ffmpeginit = 0;
  60
  61 /*****************************************************************************
  62  * Module descriptor
  63  *****************************************************************************/
  64
  65 #define ERROR_RESILIENCE_LONGTEXT \
  66     "ffmpeg can make errors resiliences.          \n"\
  67     "Nevertheless, with buggy encoder (like ISO MPEG-4 encoder from M$) " \
  68     "this will produce a lot of errors.\n" \
  69     "Valid range is -1 to 99 (-1 disable all errors resiliences)."
  70
  71 #define HURRY_UP_LONGTEXT \
  72     "Allow the decoder to partially decode or skip frame(s) " \
  73     "when there not enough time.\n It's usefull with low CPU power " \
  74     "but it could produce broken pictures."
  75
  76 vlc_module_begin();
  77     add_category_hint( N_("Miscellaneous"), NULL );
  78 #if LIBAVCODEC_BUILD >= 4611
  79     add_integer ( "ffmpeg-error-resilience", 0, NULL,
  80                   "error resilience", ERROR_RESILIENCE_LONGTEXT );
  81     add_integer ( "ffmpeg-workaround-bugs", 0, NULL,
  82                   "workaround bugs", "0-99, seems to be for msmpeg v3\n"  );
  83 #endif
  84     add_bool( "ffmpeg-hurry-up", 0, NULL, "hurry up", HURRY_UP_LONGTEXT );
  85     set_description( _("ffmpeg video decoder((MS)MPEG4,SVQ1,H263)") );
  86     set_capability( "decoder", 70 );
  87     set_callbacks( OpenDecoder, NULL );
  88 vlc_module_end();
  89
  90 /*****************************************************************************
  91  * OpenDecoder: probe the decoder and return score
  92  *****************************************************************************
  93  * Tries to launch a decoder and return score so that the interface is able
  94  * to chose.
  95  *****************************************************************************/
  96 static int OpenDecoder( vlc_object_t *p_this )
  97 {
  98     decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;
  99
 100     if( ffmpeg_GetFfmpegCodec( p_fifo->i_fourcc, NULL, NULL ) )
 101     {
 102         p_fifo->pf_run = RunDecoder;
 103         return VLC_SUCCESS;
 104     }
 105
 106     return VLC_EGENERIC;
 107 }
 108
 109 /*****************************************************************************
 110  * RunDecoder: this function is called just after the thread is created
 111  *****************************************************************************/
 112 static int RunDecoder( decoder_fifo_t *p_fifo )
 113 {
 114     videodec_thread_t   *p_vdec;
 115     int b_error;
 116
 117     if ( !(p_vdec = (videodec_thread_t*)malloc( sizeof(videodec_thread_t))) )
 118     {
 119         msg_Err( p_fifo, "out of memory" );
 120         DecoderError( p_fifo );
 121         return( -1 );
 122     }
 123     memset( p_vdec, 0, sizeof( videodec_thread_t ) );
 124
 125     p_vdec->p_fifo = p_fifo;
 126
 127     if( InitThread( p_vdec ) != 0 )
 128     {
 129         DecoderError( p_fifo );
 130         return( -1 );
 131     }
 132
 133     while( (!p_vdec->p_fifo->b_die) && (!p_vdec->p_fifo->b_error) )
 134     {
 135         DecodeThread( p_vdec );
 136     }
 137
 138     if( ( b_error = p_vdec->p_fifo->b_error ) )
 139     {
 140         DecoderError( p_vdec->p_fifo );
 141     }
 142
 143     EndThread( p_vdec );
 144
 145     if( b_error )
 146     {
 147         return( -1 );
 148     }
 149
 150     return( 0 );
 151 }
 152
 153
 154 /*****************************************************************************
 155  * locales Functions
 156  *****************************************************************************/
 157
 158 #define GetWLE( p ) \
 159     ( *(u8*)(p) + ( *((u8*)(p)+1) << 8 ) )
 160
 161 #define GetDWLE( p ) \
 162     (  *(u8*)(p) + ( *((u8*)(p)+1) << 8 ) + \
 163       ( *((u8*)(p)+2) << 16 ) + ( *((u8*)(p)+3) << 24 ) )
 164
 165 static void ffmpeg_ParseBitMapInfoHeader( bitmapinfoheader_t *p_bh,
 166                                           u8 *p_data )
 167 {
 168     p_bh->i_size          = GetDWLE( p_data );
 169     p_bh->i_width         = GetDWLE( p_data + 4 );
 170     p_bh->i_height        = GetDWLE( p_data + 8 );
 171     p_bh->i_planes        = GetWLE( p_data + 12 );
 172     p_bh->i_bitcount      = GetWLE( p_data + 14 );
 173     p_bh->i_compression   = GetDWLE( p_data + 16 );
 174     p_bh->i_sizeimage     = GetDWLE( p_data + 20 );
 175     p_bh->i_xpelspermeter = GetDWLE( p_data + 24 );
 176     p_bh->i_ypelspermeter = GetDWLE( p_data + 28 );
 177     p_bh->i_clrused       = GetDWLE( p_data + 32 );
 178     p_bh->i_clrimportant  = GetDWLE( p_data + 36 );
 179
 180     if( p_bh->i_size > 40 )
 181     {
 182         p_bh->i_data = p_bh->i_size - 40;
 183         p_bh->p_data = malloc( p_bh->i_data );
 184         memcpy( p_bh->p_data, p_data + 40, p_bh->i_data );
 185     }
 186     else
 187     {
 188         p_bh->i_data = 0;
 189         p_bh->p_data = NULL;
 190     }
 191
 192 }
 193 /* get the first pes from fifo */
 194 static pes_packet_t *__PES_GET( decoder_fifo_t *p_fifo )
 195 {
 196     pes_packet_t *p_pes;
 197
 198     vlc_mutex_lock( &p_fifo->data_lock );
 199
 200     /* if fifo is emty wait */
 201     while( !p_fifo->p_first )
 202     {
 203         if( p_fifo->b_die )
 204         {
 205             vlc_mutex_unlock( &p_fifo->data_lock );
 206             return( NULL );
 207         }
 208         vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
 209     }
 210     p_pes = p_fifo->p_first;
 211
 212     vlc_mutex_unlock( &p_fifo->data_lock );
 213
 214     return( p_pes );
 215 }
 216
 217 /* free the first pes and go to next */
 218 static void __PES_NEXT( decoder_fifo_t *p_fifo )
 219 {
 220     pes_packet_t *p_next;
 221
 222     vlc_mutex_lock( &p_fifo->data_lock );
 223
 224     p_next = p_fifo->p_first->p_next;
 225     p_fifo->p_first->p_next = NULL;
 226     input_DeletePES( p_fifo->p_packets_mgt, p_fifo->p_first );
 227     p_fifo->p_first = p_next;
 228     p_fifo->i_depth--;
 229
 230     if( !p_fifo->p_first )
 231     {
 232         /* No PES in the fifo */
 233         /* pp_last no longer valid */
 234         p_fifo->pp_last = &p_fifo->p_first;
 235         while( !p_fifo->p_first )
 236         {
 237             vlc_cond_signal( &p_fifo->data_wait );
 238             vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
 239         }
 240     }
 241     vlc_mutex_unlock( &p_fifo->data_lock );
 242 }
 243
 244 static inline void __GetFrame( videodec_thread_t *p_vdec )
 245 {
 246     pes_packet_t  *p_pes;
 247     data_packet_t *p_data;
 248     byte_t        *p_buffer;
 249
 250     p_pes = __PES_GET( p_vdec->p_fifo );
 251     p_vdec->i_pts = p_pes->i_pts;
 252
 253     while( ( !p_pes->i_nb_data )||( !p_pes->i_pes_size ) )
 254     {
 255         __PES_NEXT( p_vdec->p_fifo );
 256         p_pes = __PES_GET( p_vdec->p_fifo );
 257     }
 258     p_vdec->i_framesize = p_pes->i_pes_size;
 259     if( p_pes->i_nb_data == 1 )
 260     {
 261         p_vdec->p_framedata = p_pes->p_first->p_payload_start;
 262         return;
 263     }
 264     /* get a buffer and gather all data packet */
 265     p_vdec->p_framedata = p_buffer = malloc( p_pes->i_pes_size );
 266     p_data = p_pes->p_first;
 267     do
 268     {
 269         p_vdec->p_fifo->p_vlc->pf_memcpy( p_buffer, p_data->p_payload_start,
 270                      p_data->p_payload_end - p_data->p_payload_start );
 271         p_buffer += p_data->p_payload_end - p_data->p_payload_start;
 272         p_data = p_data->p_next;
 273     } while( p_data );
 274 }
 275
 276 static inline void __NextFrame( videodec_thread_t *p_vdec )
 277 {
 278     pes_packet_t  *p_pes;
 279
 280     p_pes = __PES_GET( p_vdec->p_fifo );
 281     if( p_pes->i_nb_data != 1 )
 282     {
 283         free( p_vdec->p_framedata ); /* FIXME keep this buffer */
 284     }
 285     __PES_NEXT( p_vdec->p_fifo );
 286 }
 287
 288 /* FIXME FIXME some of them are wrong */
 289 static int i_ffmpeg_PixFmtToChroma[] =
 290 {
 291 /* PIX_FMT_ANY = -1,PIX_FMT_YUV420P, PIX_FMT_YUV422,
 292    PIX_FMT_RGB24, PIX_FMT_BGR24, PIX_FMT_YUV422P,
 293    PIX_FMT_YUV444P, PIX_FMT_YUV410P */
 294
 295     0, VLC_FOURCC('I','4','2','0'), VLC_FOURCC('I','4','2','0'),
 296     VLC_FOURCC('R','V','2','4'), 0, VLC_FOURCC('Y','4','2','2'),
 297     VLC_FOURCC('I','4','4','4'), 0
 298 };
 299
 300 static inline u32 ffmpeg_PixFmtToChroma( int i_ffmpegchroma )
 301 {
 302     if( ++i_ffmpegchroma > 7 )
 303     {
 304         return( 0 );
 305     }
 306     else
 307     {
 308         return( i_ffmpeg_PixFmtToChroma[i_ffmpegchroma] );
 309     }
 310 }
 311
 312 static inline int ffmpeg_FfAspect( int i_width, int i_height, int i_ffaspect )
 313 {
 314     switch( i_ffaspect )
 315     {
 316         case( FF_ASPECT_4_3_625 ):
 317         case( FF_ASPECT_4_3_525 ):
 318             return( VOUT_ASPECT_FACTOR * 4 / 3);
 319         case( FF_ASPECT_16_9_625 ):
 320         case( FF_ASPECT_16_9_525 ):
 321             return( VOUT_ASPECT_FACTOR * 16 / 9 );
 322         case( FF_ASPECT_SQUARE ):
 323         default:
 324             return( VOUT_ASPECT_FACTOR * i_width / i_height );
 325     }
 326 }
 327
 328 static int ffmpeg_CheckVout( vout_thread_t *p_vout,
 329                              int i_width,
 330                              int i_height,
 331                              int i_aspect,
 332                              int i_chroma )
 333 {
 334     if( !p_vout )
 335     {
 336         return( 0 );
 337     }
 338     if( !i_chroma )
 339     {
 340         /* we will try to make conversion */
 341         i_chroma = VLC_FOURCC('I','4','2','0');
 342     }
 343
 344     if( ( p_vout->render.i_width != i_width )||
 345         ( p_vout->render.i_height != i_height )||
 346         ( p_vout->render.i_chroma != i_chroma )||
 347         ( p_vout->render.i_aspect !=
 348                 ffmpeg_FfAspect( i_width, i_height, i_aspect ) ) )
 349     {
 350         return( 0 );
 351     }
 352     else
 353     {
 354         return( 1 );
 355     }
 356 }
 357
 358 /* Return a Vout */
 359
 360 static vout_thread_t *ffmpeg_CreateVout( videodec_thread_t *p_vdec,
 361                                          int i_width,
 362                                          int i_height,
 363                                          int i_aspect,
 364                                          int i_chroma )
 365 {
 366     vout_thread_t *p_vout;
 367
 368     if( (!i_width)||(!i_height) )
 369     {
 370         return( NULL ); /* Can't create a new vout without display size */
 371     }
 372
 373     if( !i_chroma )
 374     {
 375         /* we make conversion if possible*/
 376         i_chroma = VLC_FOURCC('I','4','2','0');
 377         msg_Warn( p_vdec->p_fifo, "Internal chroma conversion (FIXME)");
 378         /* It's mainly for I410 -> I420 conversion that I've made,
 379            it's buggy and very slow */
 380     }
 381
 382     i_aspect = ffmpeg_FfAspect( i_width, i_height, i_aspect );
 383
 384     /* Spawn a video output if there is none. First we look for our children,
 385      * then we look for any other vout that might be available. */
 386     p_vout = vlc_object_find( p_vdec->p_fifo, VLC_OBJECT_VOUT,
 387                                               FIND_CHILD );
 388     if( !p_vout )
 389     {
 390         p_vout = vlc_object_find( p_vdec->p_fifo, VLC_OBJECT_VOUT,
 391                                                   FIND_ANYWHERE );
 392     }
 393
 394     if( p_vout )
 395     {
 396         if( !ffmpeg_CheckVout( p_vout,
 397                                i_width, i_height, i_aspect,i_chroma ) )
 398         {
 399             /* We are not interested in this format, close this vout */
 400             vlc_object_detach_all( p_vout );
 401             vlc_object_release( p_vout );
 402             vout_DestroyThread( p_vout );
 403             p_vout = NULL;
 404         }
 405         else
 406         {
 407             /* This video output is cool! Hijack it. */
 408             vlc_object_detach_all( p_vout );
 409             vlc_object_attach( p_vout, p_vdec->p_fifo );
 410             vlc_object_release( p_vout );
 411         }
 412     }
 413
 414     if( p_vout == NULL )
 415     {
 416         msg_Dbg( p_vdec->p_fifo, "no vout present, spawning one" );
 417
 418         p_vout = vout_CreateThread( p_vdec->p_fifo,
 419                                     i_width,
 420                                     i_height,
 421                                     i_chroma,
 422                                     i_aspect );
 423     }
 424
 425     return( p_vout );
 426 }
 427
 428 /* FIXME FIXME FIXME this is a big shit
 429    does someone want to rewrite this function ?
 430    or said to me how write a better thing
 431    FIXME FIXME FIXME
 432 */
 433
 434 static void ffmpeg_ConvertPictureI410toI420( picture_t *p_pic,
 435                                              AVPicture *p_avpicture,
 436                                              videodec_thread_t   *p_vdec )
 437 {
 438     u8 *p_src, *p_dst;
 439     u8 *p_plane[3];
 440     int i_plane;
 441
 442     int i_stride, i_lines;
 443     int i_height, i_width;
 444     int i_y, i_x;
 445
 446     i_height = p_vdec->p_context->height;
 447     i_width  = p_vdec->p_context->width;
 448
 449     p_dst = p_pic->p[0].p_pixels;
 450     p_src  = p_avpicture->data[0];
 451
 452     /* copy first plane */
 453     for( i_y = 0; i_y < i_height; i_y++ )
 454     {
 455         p_vdec->p_fifo->p_vlc->pf_memcpy( p_dst, p_src, i_width);
 456         p_dst += p_pic->p[0].i_pitch;
 457         p_src += p_avpicture->linesize[0];
 458     }
 459
 460     /* process each plane in a temporary buffer */
 461     for( i_plane = 1; i_plane < 3; i_plane++ )
 462     {
 463         i_stride = p_avpicture->linesize[i_plane];
 464         i_lines = i_height / 4;
 465
 466         p_dst = p_plane[i_plane] = malloc( i_lines * i_stride * 2 * 2 );
 467         p_src  = p_avpicture->data[i_plane];
 468
 469         /* for each source line */
 470         for( i_y = 0; i_y < i_lines; i_y++ )
 471         {
 472             for( i_x = 0; i_x < i_stride - 1; i_x++ )
 473             {
 474                 p_dst[2 * i_x    ] = p_src[i_x];
 475                 p_dst[2 * i_x + 1] = ( p_src[i_x] + p_src[i_x + 1]) / 2;
 476
 477             }
 478             p_dst[2 * i_stride - 2] = p_src[i_x];
 479             p_dst[2 * i_stride - 1] = p_src[i_x];
 480
 481             p_dst += 4 * i_stride; /* process the next even lines */
 482             p_src += i_stride;
 483         }
 484
 485
 486     }
 487
 488     for( i_plane = 1; i_plane < 3; i_plane++ )
 489     {
 490         i_stride = p_avpicture->linesize[i_plane];
 491         i_lines = i_height / 4;
 492
 493         p_dst = p_plane[i_plane] + 2*i_stride;
 494         p_src  = p_plane[i_plane];
 495
 496         for( i_y = 0; i_y < i_lines - 1; i_y++ )
 497         {
 498             for( i_x = 0; i_x <  2 * i_stride ; i_x++ )
 499             {
 500                 p_dst[i_x] = ( p_src[i_x] + p_src[i_x + 4*i_stride])/2;
 501             }
 502
 503             p_dst += 4 * i_stride; /* process the next odd lines */
 504             p_src += 4 * i_stride;
 505         }
 506         /* last line */
 507         p_vdec->p_fifo->p_vlc->pf_memcpy( p_dst, p_src, 2*i_stride );
 508     }
 509     /* copy to p_pic, by block
 510        if I do pixel per pixel it segfault. It's why I use
 511        temporaries buffers */
 512     for( i_plane = 1; i_plane < 3; i_plane++ )
 513     {
 514
 515         int i_size;
 516         p_src  = p_plane[i_plane];
 517         p_dst = p_pic->p[i_plane].p_pixels;
 518
 519         i_size = __MIN( 2*i_stride, p_pic->p[i_plane].i_pitch);
 520         for( i_y = 0; i_y < __MIN(p_pic->p[i_plane].i_lines, 2 * i_lines); i_y++ )
 521         {
 522             p_vdec->p_fifo->p_vlc->pf_memcpy( p_dst, p_src, i_size );
 523             p_src += 2 * i_stride;
 524             p_dst += p_pic->p[i_plane].i_pitch;
 525         }
 526         free( p_plane[i_plane] );
 527     }
 528
 529 }
 530
 531 static void ffmpeg_ConvertPicture( picture_t *p_pic,
 532                                    AVPicture *p_avpicture,
 533                                    videodec_thread_t   *p_vdec )
 534 {
 535     int i_plane;
 536     int i_size;
 537     int i_line;
 538
 539     u8  *p_dst;
 540     u8  *p_src;
 541     int i_src_stride;
 542     int i_dst_stride;
 543
 544     if( ffmpeg_PixFmtToChroma( p_vdec->p_context->pix_fmt ) )
 545     {
 546         /* convert ffmpeg picture to our format */
 547         for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
 548         {
 549             p_src  = p_avpicture->data[i_plane];
 550             p_dst = p_pic->p[i_plane].p_pixels;
 551             i_src_stride = p_avpicture->linesize[i_plane];
 552             i_dst_stride = p_pic->p[i_plane].i_pitch;
 553
 554             i_size = __MIN( i_src_stride, i_dst_stride );
 555             for( i_line = 0; i_line < p_pic->p[i_plane].i_lines; i_line++ )
 556             {
 557                 p_vdec->p_fifo->p_vlc->pf_memcpy( p_dst, p_src, i_size );
 558                 p_src += i_src_stride;
 559                 p_dst += i_dst_stride;
 560             }
 561         }
 562         return;
 563     }
 564
 565     /* we need to convert to I420 */
 566     switch( p_vdec->p_context->pix_fmt )
 567     {
 568 #if LIBAVCODEC_BUILD >= 4615
 569         case( PIX_FMT_YUV410P ):
 570             ffmpeg_ConvertPictureI410toI420( p_pic, p_avpicture, p_vdec );
 571             break;
 572 #endif
 573         default:
 574             p_vdec->p_fifo->b_error =1;
 575             break;
 576     }
 577 }
 578
 579
 580 /*****************************************************************************
 581  *
 582  * Functions that initialize, decode and end the decoding process
 583  *
 584  *****************************************************************************/
 585
 586 /*****************************************************************************
 587  * InitThread: initialize vdec output thread
 588  *****************************************************************************
 589  * This function is called from RunDecoderoder and performs the second step
 590  * of the initialization. It returns 0 on success. Note that the thread's
 591  * flag are not modified inside this function.
 592  *****************************************************************************/
 593
 594 static int InitThread( videodec_thread_t *p_vdec )
 595 {
 596     int i_ffmpeg_codec;
 597     int i_tmp;
 598
 599     if( p_vdec->p_fifo->p_demux_data )
 600     {
 601         ffmpeg_ParseBitMapInfoHeader( &p_vdec->format,
 602                                       (u8*)p_vdec->p_fifo->p_demux_data );
 603     }
 604     else
 605     {
 606         msg_Warn( p_vdec->p_fifo, "display informations missing" );
 607     }
 608
 609     /*init ffmpeg */
 610     if( !b_ffmpeginit )
 611     {
 612         avcodec_init();
 613         avcodec_register_all();
 614         b_ffmpeginit = 1;
 615         msg_Dbg( p_vdec->p_fifo, "library ffmpeg initialized" );
 616     }
 617     else
 618     {
 619         msg_Dbg( p_vdec->p_fifo, "library ffmpeg already initialized" );
 620     }
 621     ffmpeg_GetFfmpegCodec( p_vdec->p_fifo->i_fourcc,
 622                            &i_ffmpeg_codec,
 623                            &p_vdec->psz_namecodec );
 624     p_vdec->p_codec =
 625         avcodec_find_decoder( i_ffmpeg_codec );
 626
 627     if( !p_vdec->p_codec )
 628     {
 629         msg_Err( p_vdec->p_fifo, "codec not found (%s)",
 630                                  p_vdec->psz_namecodec );
 631         return( -1 );
 632     }
 633
 634     p_vdec->p_context = &p_vdec->context;
 635     memset( p_vdec->p_context, 0, sizeof( AVCodecContext ) );
 636
 637     p_vdec->p_context->width  = p_vdec->format.i_width;
 638     p_vdec->p_context->height = p_vdec->format.i_height;
 639
 640 /*  XXX
 641     p_vdec->p_context->workaround_bugs
 642       --> seems to be for msmpeg 3 but can't know what is supposed to do
 643
 644     p_vdec->p_context->strict_std_compliance
 645       --> strictly follow mpeg4 standard for decoder or encoder ??
 646
 647     p_vdec->p_context->error_resilience
 648       --> don't make error resilience, because of some ms encoder witch
 649       use some wrong VLC code.
 650 */
 651
 652 #if LIBAVCODEC_BUILD >= 4611
 653     i_tmp = config_GetInt( p_vdec->p_fifo, "ffmpeg-workaround-bugs" );
 654     p_vdec->p_context->workaround_bugs  = __MAX( __MIN( i_tmp, 99 ), 0 );
 655
 656     i_tmp = config_GetInt( p_vdec->p_fifo, "ffmpeg-error-resilience" );
 657     p_vdec->p_context->error_resilience = __MAX( __MIN( i_tmp, 99 ), -1 );
 658 #endif
 659 #if LIBAVCODEC_BUILD >= 4614
 660     if( config_GetInt( p_vdec->p_fifo, "grayscale" ) )
 661     {
 662         p_vdec->p_context->flags|= CODEC_FLAG_GRAY;
 663     }
 664 #endif
 665
 666     if (avcodec_open(p_vdec->p_context, p_vdec->p_codec) < 0)
 667     {
 668         msg_Err( p_vdec->p_fifo, "cannot open codec (%s)",
 669                                  p_vdec->psz_namecodec );
 670         return( -1 );
 671     }
 672     else
 673     {
 674         msg_Dbg( p_vdec->p_fifo, "ffmpeg codec (%s) started",
 675                                  p_vdec->psz_namecodec );
 676     }
 677
 678     /* first give init data */
 679     if( p_vdec->format.i_data )
 680     {
 681         AVPicture avpicture;
 682         int b_gotpicture;
 683
 684         switch( i_ffmpeg_codec )
 685         {
 686             case( CODEC_ID_MPEG4 ):
 687                 avcodec_decode_video( p_vdec->p_context, &avpicture,
 688                                       &b_gotpicture,
 689                                       p_vdec->format.p_data,
 690                                       p_vdec->format.i_data );
 691                 break;
 692             default:
 693                 break;
 694         }
 695     }
 696
 697     /* This will be created after the first decoded frame */
 698     p_vdec->p_vout = NULL;
 699
 700     return( 0 );
 701 }
 702
 703 /*****************************************************************************
 704  * DecodeThread: Called for decode one frame
 705  *****************************************************************************/
 706 static void  DecodeThread( videodec_thread_t *p_vdec )
 707 {
 708     int     i_status;
 709     int     b_drawpicture;
 710     int     b_gotpicture;
 711     AVPicture avpicture;  /* ffmpeg picture */
 712     picture_t *p_pic; /* videolan picture */
 713     /* we have to get a frame stored in a pes
 714        give it to ffmpeg decoder
 715        and send the image to the output */
 716
 717     /* TODO implement it in a better way */
 718
 719     if( ( config_GetInt(p_vdec->p_fifo, "ffmpeg-hurry-up") )&&
 720         ( p_vdec->i_frame_late > 4 ) )
 721     {
 722 #if LIBAVCODEC_BUILD > 4603
 723         b_drawpicture = 0;
 724         if( p_vdec->i_frame_late < 8 )
 725         {
 726             p_vdec->p_context->hurry_up = 2;
 727         }
 728         else
 729         {
 730             /* too much late picture, won't decode
 731                but break picture until a new I, and for mpeg4 ...*/
 732             p_vdec->i_frame_late--; /* needed else it will never be decrease */
 733             __PES_NEXT( p_vdec->p_fifo );
 734             return;
 735         }
 736 #else
 737         if( p_vdec->i_frame_late < 8 )
 738         {
 739             b_drawpicture = 0; /* not really good but .. */
 740         }
 741         else
 742         {
 743             /* too much late picture, won't decode
 744                but break picture until a new I, and for mpeg4 ...*/
 745             p_vdec->i_frame_late--; /* needed else it will never be decrease */
 746             __PES_NEXT( p_vdec->p_fifo );
 747             return;
 748         }
 749 #endif
 750     }
 751     else
 752     {
 753         b_drawpicture = 1;
 754 #if LIBAVCODEC_BUILD > 4603
 755         p_vdec->p_context->hurry_up = 0;
 756 #endif
 757     }
 758
 759     __GetFrame( p_vdec );
 760
 761     i_status = avcodec_decode_video( p_vdec->p_context,
 762                                      &avpicture,
 763                                      &b_gotpicture,
 764                                      p_vdec->p_framedata,
 765                                      p_vdec->i_framesize);
 766
 767     __NextFrame( p_vdec );
 768
 769     if( i_status < 0 )
 770     {
 771         msg_Warn( p_vdec->p_fifo, "cannot decode one frame (%d bytes)",
 772                                   p_vdec->i_framesize );
 773         p_vdec->i_frame_error++;
 774         return;
 775     }
 776     /* Update frame late count*/
 777     /* I don't make statistic on decoding time */
 778     if( p_vdec->i_pts <= mdate())
 779     {
 780         p_vdec->i_frame_late++;
 781     }
 782     else
 783     {
 784         p_vdec->i_frame_late = 0;
 785     }
 786
 787     if( !b_gotpicture || avpicture.linesize[0] == 0 || !b_drawpicture)
 788     {
 789         return;
 790     }
 791
 792     /* Check our vout */
 793     if( !ffmpeg_CheckVout( p_vdec->p_vout,
 794                            p_vdec->p_context->width,
 795                            p_vdec->p_context->height,
 796                            p_vdec->p_context->aspect_ratio_info,
 797                            ffmpeg_PixFmtToChroma(p_vdec->p_context->pix_fmt)) )
 798     {
 799         p_vdec->p_vout =
 800           ffmpeg_CreateVout( p_vdec,
 801                              p_vdec->p_context->width,
 802                              p_vdec->p_context->height,
 803                              p_vdec->p_context->aspect_ratio_info,
 804                              ffmpeg_PixFmtToChroma(p_vdec->p_context->pix_fmt));
 805         if( !p_vdec->p_vout )
 806         {
 807             msg_Err( p_vdec->p_fifo, "cannot create vout" );
 808             p_vdec->p_fifo->b_error = 1; /* abort */
 809             return;
 810         }
 811     }
 812
 813     /* Send decoded frame to vout */
 814     while( !(p_pic = vout_CreatePicture( p_vdec->p_vout, 0, 0, 0 ) ) )
 815     {
 816         if( p_vdec->p_fifo->b_die || p_vdec->p_fifo->b_error )
 817         {
 818             return;
 819         }
 820         msleep( VOUT_OUTMEM_SLEEP );
 821     }
 822
 823     ffmpeg_ConvertPicture( p_pic,
 824                            &avpicture,
 825                            p_vdec );
 826
 827
 828     /* FIXME correct avi and use i_dts */
 829     vout_DatePicture( p_vdec->p_vout, p_pic, p_vdec->i_pts);
 830     vout_DisplayPicture( p_vdec->p_vout, p_pic );
 831
 832     return;
 833 }
 834
 835
 836 /*****************************************************************************
 837  * EndThread: thread destruction
 838  *****************************************************************************
 839  * This function is called when the thread ends after a sucessful
 840  * initialization.
 841  *****************************************************************************/
 842 static void EndThread( videodec_thread_t *p_vdec )
 843 {
 844     if( !p_vdec )
 845     {
 846         return;
 847     }
 848
 849     if( p_vdec->p_context != NULL)
 850     {
 851         avcodec_close( p_vdec->p_context );
 852         msg_Dbg( p_vdec->p_fifo, "ffmpeg codec (%s) stopped",
 853                                  p_vdec->psz_namecodec );
 854     }
 855
 856     if( p_vdec->p_vout != NULL )
 857     {
 858         /* We are about to die. Reattach video output to p_vlc. */
 859         vlc_object_detach( p_vdec->p_vout, p_vdec->p_fifo );
 860         vlc_object_attach( p_vdec->p_vout, p_vdec->p_fifo->p_vlc );
 861     }
 862
 863     if( p_vdec->format.p_data != NULL)
 864     {
 865         free( p_vdec->format.p_data );
 866     }
 867
 868     free( p_vdec );
 869 }