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 1.47 2003/08/08 17:08:32 gbazin 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/aout.h>
  32 #include <vlc/decoder.h>
  33 #include <vlc/input.h>
  34
  35 #include <string.h>
  36
  37 #ifdef HAVE_SYS_TIMES_H
  38 #   include <sys/times.h>
  39 #endif
  40
  41 /* ffmpeg header */
  42 #ifdef HAVE_FFMPEG_AVCODEC_H
  43 #   include <ffmpeg/avcodec.h>
  44 #else
  45 #   include <avcodec.h>
  46 #endif
  47
  48 #if LIBAVCODEC_BUILD < 4655
  49 #   error You must have a libavcodec >= 4655 (get CVS)
  50 #endif
  51
  52
  53 #include "ffmpeg.h"
  54
  55 #ifdef LIBAVCODEC_PP
  56 #   ifdef HAVE_POSTPROC_POSTPROCESS_H
  57 #       include <postproc/postprocess.h>
  58 #   else
  59 #       include <libpostproc/postprocess.h>
  60 #   endif
  61 #endif
  62
  63 #include "video.h" // video ffmpeg specific
  64 #include "audio.h" // audio ffmpeg specific
  65
  66 /*
  67  * Local prototypes
  68  */
  69 int             E_(OpenChroma)  ( vlc_object_t * );
  70 static int      OpenDecoder     ( vlc_object_t * );
  71 static int      RunDecoder      ( decoder_fifo_t * );
  72
  73 static int      InitThread      ( generic_thread_t * );
  74 static void     EndThread       ( generic_thread_t * );
  75
  76
  77 static int      b_ffmpeginit = 0;
  78
  79 static int ffmpeg_GetFfmpegCodec( vlc_fourcc_t, int *, int *, char ** );
  80
  81 /*****************************************************************************
  82  * Module descriptor
  83  *****************************************************************************/
  84 #define DR_TEXT N_("Direct rendering")
  85
  86 #define ERROR_TEXT N_("Error resilience")
  87 #define ERROR_LONGTEXT N_( \
  88     "ffmpeg can make errors resiliences.          \n" \
  89     "Nevertheless, with a buggy encoder (like ISO MPEG-4 encoder from M$) " \
  90     "this will produce a lot of errors.\n" \
  91     "Valid range is -1 to 99 (-1 disables all errors resiliences).")
  92
  93 #define BUGS_TEXT N_("Workaround bugs")
  94 #define BUGS_LONGTEXT N_( \
  95     "Try to fix some bugs\n" \
  96     "1  autodetect\n" \
  97     "2  old msmpeg4\n" \
  98     "4  xvid interlaced\n" \
  99     "8  ump4 \n" \
 100     "16 no padding\n" \
 101     "32 ac vlc\n" \
 102     "64 Qpel chroma")
 103
 104 #define HURRYUP_TEXT N_("Hurry up")
 105 #define HURRYUP_LONGTEXT N_( \
 106     "Allow the decoder to partially decode or skip frame(s) " \
 107     "when there is not enough time. It's useful with low CPU power " \
 108     "but it can produce distorted pictures.")
 109
 110 #define TRUNC_TEXT N_("Truncated stream")
 111 #define TRUNC_LONGTEXT N_("truncated stream -1:auto,0:disable,:1:enable")
 112
 113 #define PP_Q_TEXT N_("Post processing quality")
 114 #define PP_Q_LONGTEXT N_( \
 115     "Quality of post processing. Valid range is 0 to 6\n" \
 116     "Higher levels require considerable more CPU power, but produce " \
 117     "better looking pictures." )
 118
 119 #define LIBAVCODEC_PP_TEXT N_("Ffmpeg postproc filter chains")
 120 /* FIXME (cut/past from ffmpeg */
 121 #define LIBAVCODEC_PP_LONGTEXT \
 122 "<filterName>[:<option>[:<option>...]][[,|/][-]<filterName>[:<option>...]]...\n" \
 123 "long form example:\n" \
 124 "vdeblock:autoq/hdeblock:autoq/linblenddeint    default,-vdeblock\n" \
 125 "short form example:\n" \
 126 "vb:a/hb:a/lb de,-vb\n" \
 127 "more examples:\n" \
 128 "tn:64:128:256\n" \
 129 "Filters                        Options\n" \
 130 "short  long name       short   long option     Description\n" \
 131 "*      *               a       autoq           cpu power dependant enabler\n" \
 132 "                       c       chrom           chrominance filtring enabled\n" \
 133 "                       y       nochrom         chrominance filtring disabled\n" \
 134 "hb     hdeblock        (2 Threshold)           horizontal deblocking filter\n" \
 135 "       1. difference factor: default=64, higher -> more deblocking\n" \
 136 "       2. flatness threshold: default=40, lower -> more deblocking\n" \
 137 "                       the h & v deblocking filters share these\n" \
 138 "                       so u cant set different thresholds for h / v\n" \
 139 "vb     vdeblock        (2 Threshold)           vertical deblocking filter\n" \
 140 "h1     x1hdeblock                              Experimental h deblock filter 1\n" \
 141 "v1     x1vdeblock                              Experimental v deblock filter 1\n" \
 142 "dr     dering                                  Deringing filter\n" \
 143 "al     autolevels                              automatic brightness / contrast\n" \
 144 "                       f       fullyrange      stretch luminance to (0..255)\n" \
 145 "lb     linblenddeint                           linear blend deinterlacer\n" \
 146 "li     linipoldeint                            linear interpolating deinterlace\n" \
 147 "ci     cubicipoldeint                          cubic interpolating deinterlacer\n" \
 148 "md     mediandeint                             median deinterlacer\n" \
 149 "fd     ffmpegdeint                             ffmpeg deinterlacer\n" \
 150 "de     default                                 hb:a,vb:a,dr:a,al\n" \
 151 "fa     fast                                    h1:a,v1:a,dr:a,al\n" \
 152 "tn     tmpnoise        (3 Thresholds)          Temporal Noise Reducer\n" \
 153 "                       1. <= 2. <= 3.          larger -> stronger filtering\n" \
 154 "fq     forceQuant      <quantizer>             Force quantizer\n"
 155
 156 vlc_module_begin();
 157     add_category_hint( N_("ffmpeg"), NULL, VLC_FALSE );
 158     set_capability( "decoder", 70 );
 159     set_callbacks( OpenDecoder, NULL );
 160     set_description( _("ffmpeg audio/video decoder((MS)MPEG4,SVQ1,H263,WMV,WMA)") );
 161
 162     add_bool( "ffmpeg-dr", 1, NULL, DR_TEXT, DR_TEXT, VLC_TRUE );
 163     add_integer ( "ffmpeg-error-resilience", -1, NULL, ERROR_TEXT, ERROR_LONGTEXT, VLC_TRUE );
 164     add_integer ( "ffmpeg-workaround-bugs", 1, NULL, BUGS_TEXT, BUGS_LONGTEXT, VLC_FALSE );
 165     add_bool( "ffmpeg-hurry-up", 0, NULL, HURRYUP_TEXT, HURRYUP_LONGTEXT, VLC_FALSE );
 166     add_integer( "ffmpeg-truncated", -1, NULL, TRUNC_TEXT, TRUNC_LONGTEXT, VLC_FALSE );
 167
 168     add_category_hint( N_("Post processing"), NULL, VLC_FALSE );
 169
 170     add_integer( "ffmpeg-pp-q", 0, NULL, PP_Q_TEXT, PP_Q_LONGTEXT, VLC_FALSE );
 171 #ifdef LIBAVCODEC_PP
 172     add_string( "ffmpeg-pp-name", "default", NULL, LIBAVCODEC_PP_TEXT, LIBAVCODEC_PP_LONGTEXT, VLC_TRUE );
 173 #endif
 174
 175     /* chroma conversion submodule */
 176     add_submodule();
 177     set_capability( "chroma", 50 );
 178     set_callbacks( E_(OpenChroma), NULL );
 179     set_description( _("ffmpeg chroma conversion") );
 180
 181     var_Create( p_module->p_libvlc, "avcodec", VLC_VAR_MUTEX );
 182 vlc_module_end();
 183
 184 /*****************************************************************************
 185  * OpenDecoder: probe the decoder and return score
 186  *****************************************************************************
 187  * Tries to launch a decoder and return score so that the interface is able
 188  * to chose.
 189  *****************************************************************************/
 190 static int OpenDecoder( vlc_object_t *p_this )
 191 {
 192     decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;
 193
 194     if( ffmpeg_GetFfmpegCodec( p_fifo->i_fourcc, NULL, NULL, NULL ) )
 195     {
 196         p_fifo->pf_run = RunDecoder;
 197         return VLC_SUCCESS;
 198     }
 199
 200     return VLC_EGENERIC;
 201 }
 202
 203 typedef union decoder_thread_u
 204 {
 205     generic_thread_t gen;
 206     adec_thread_t    audio;
 207     vdec_thread_t    video;
 208
 209 } decoder_thread_t;
 210
 211
 212 /*****************************************************************************
 213  * RunDecoder: this function is called just after the thread is created
 214  *****************************************************************************/
 215 static int RunDecoder( decoder_fifo_t *p_fifo )
 216 {
 217     generic_thread_t *p_decoder;
 218     int b_error;
 219
 220     if ( !(p_decoder = malloc( sizeof( decoder_thread_t ) ) ) )
 221     {
 222         msg_Err( p_fifo, "out of memory" );
 223         DecoderError( p_fifo );
 224         return( -1 );
 225     }
 226     memset( p_decoder, 0, sizeof( decoder_thread_t ) );
 227
 228     p_decoder->p_fifo = p_fifo;
 229
 230     if( InitThread( p_decoder ) != 0 )
 231     {
 232         msg_Err( p_fifo, "initialization failed" );
 233         DecoderError( p_fifo );
 234         return( -1 );
 235     }
 236
 237     while( (!p_decoder->p_fifo->b_die) && (!p_decoder->p_fifo->b_error) )
 238     {
 239         switch( p_decoder->i_cat )
 240         {
 241             case VIDEO_ES:
 242                 E_( DecodeThread_Video )( (vdec_thread_t*)p_decoder );
 243                 break;
 244             case AUDIO_ES:
 245                 E_( DecodeThread_Audio )( (adec_thread_t*)p_decoder );
 246                 break;
 247         }
 248     }
 249
 250     if( ( b_error = p_decoder->p_fifo->b_error ) )
 251     {
 252         DecoderError( p_decoder->p_fifo );
 253     }
 254
 255     EndThread( p_decoder );
 256
 257     if( b_error )
 258     {
 259         return( -1 );
 260     }
 261
 262     return( 0 );
 263 }
 264
 265 /*****************************************************************************
 266  *
 267  * Functions that initialize, decode and end the decoding process
 268  *
 269  *****************************************************************************/
 270
 271 /*****************************************************************************
 272  * InitThread: initialize vdec output thread
 273  *****************************************************************************
 274  * This function is called from decoder_Run and performs the second step
 275  * of the initialization. It returns 0 on success. Note that the thread's
 276  * flag are not modified inside this function.
 277  *
 278  * ffmpeg codec will be open, some memory allocated. But Vout is not yet
 279  *   open (done after the first decoded frame)
 280  *****************************************************************************/
 281
 282 static int InitThread( generic_thread_t *p_decoder )
 283 {
 284     int i_result;
 285     vlc_value_t lockval;
 286
 287
 288     var_Get( p_decoder->p_fifo->p_libvlc, "avcodec", &lockval );
 289     vlc_mutex_lock( lockval.p_address );
 290
 291      /* *** init ffmpeg library (libavcodec) *** */
 292     if( !b_ffmpeginit )
 293     {
 294
 295         avcodec_init();
 296         avcodec_register_all();
 297         b_ffmpeginit = 1;
 298
 299         msg_Dbg( p_decoder->p_fifo, "libavcodec initialized (interface "
 300                                     LIBAVCODEC_BUILD_STR ")" );
 301     }
 302     else
 303     {
 304         msg_Dbg( p_decoder->p_fifo, "libavcodec already initialized" );
 305     }
 306     vlc_mutex_unlock( lockval.p_address );
 307
 308     /* *** determine codec type *** */
 309     ffmpeg_GetFfmpegCodec( p_decoder->p_fifo->i_fourcc,
 310                            &p_decoder->i_cat,
 311                            &p_decoder->i_codec_id,
 312                            &p_decoder->psz_namecodec );
 313
 314     /* *** ask ffmpeg for a decoder *** */
 315     if( !( p_decoder->p_codec =
 316                 avcodec_find_decoder( p_decoder->i_codec_id ) ) )
 317     {
 318         msg_Err( p_decoder->p_fifo,
 319                  "codec not found (%s)",
 320                  p_decoder->psz_namecodec );
 321         return( -1 );
 322     }
 323
 324      /* *** Get a p_context *** */
 325     p_decoder->p_context = avcodec_alloc_context();
 326
 327     switch( p_decoder->i_cat )
 328     {
 329         case VIDEO_ES:
 330             i_result = E_( InitThread_Video )( (vdec_thread_t*)p_decoder );
 331             break;
 332         case AUDIO_ES:
 333             i_result = E_( InitThread_Audio )( (adec_thread_t*)p_decoder );
 334             break;
 335         default:
 336             i_result = -1;
 337     }
 338
 339     p_decoder->pts = 0;
 340     p_decoder->p_buffer = NULL;
 341     p_decoder->i_buffer = 0;
 342     p_decoder->i_buffer_size = 0;
 343
 344     return( i_result );
 345 }
 346
 347 /*****************************************************************************
 348  * EndThread: thread destruction
 349  *****************************************************************************
 350  * This function is called when the thread ends after a sucessful
 351  * initialization.
 352  *****************************************************************************/
 353 static void EndThread( generic_thread_t *p_decoder )
 354 {
 355
 356     if( !p_decoder )
 357     {
 358         return;
 359     }
 360
 361     if( p_decoder->p_context != NULL)
 362     {
 363         FREE( p_decoder->p_context->extradata );
 364         avcodec_close( p_decoder->p_context );
 365         msg_Dbg( p_decoder->p_fifo,
 366                  "ffmpeg codec (%s) stopped",
 367                  p_decoder->psz_namecodec );
 368         free( p_decoder->p_context );
 369     }
 370
 371     FREE( p_decoder->p_buffer );
 372
 373     switch( p_decoder->i_cat )
 374     {
 375         case AUDIO_ES:
 376             E_( EndThread_Audio )( (adec_thread_t*)p_decoder );
 377             break;
 378         case VIDEO_ES:
 379             E_( EndThread_Video )( (vdec_thread_t*)p_decoder );
 380             break;
 381     }
 382
 383     free( p_decoder );
 384 }
 385
 386 /*****************************************************************************
 387  * locales Functions
 388  *****************************************************************************/
 389
 390 int E_( GetPESData )( u8 *p_buf, int i_max, pes_packet_t *p_pes )
 391 {
 392     int i_copy;
 393     int i_count;
 394
 395     data_packet_t   *p_data;
 396
 397     i_count = 0;
 398     p_data = p_pes->p_first;
 399     while( p_data != NULL && i_count < i_max )
 400     {
 401
 402         i_copy = __MIN( p_data->p_payload_end - p_data->p_payload_start,
 403                         i_max - i_count );
 404
 405         if( i_copy > 0 )
 406         {
 407             memcpy( p_buf,
 408                     p_data->p_payload_start,
 409                     i_copy );
 410         }
 411
 412         p_data = p_data->p_next;
 413         i_count += i_copy;
 414         p_buf   += i_copy;
 415     }
 416
 417     if( i_count < i_max )
 418     {
 419         memset( p_buf, 0, i_max - i_count );
 420     }
 421     return( i_count );
 422 }
 423
 424
 425 static int ffmpeg_GetFfmpegCodec( vlc_fourcc_t i_fourcc,
 426                                   int *pi_cat,
 427                                   int *pi_ffmpeg_codec,
 428                                   char **ppsz_name )
 429 {
 430     int i_cat;
 431     int i_codec;
 432     char *psz_name;
 433
 434     switch( i_fourcc )
 435     {
 436         case FOURCC_mpgv:
 437             i_cat = VIDEO_ES;
 438             i_codec = CODEC_ID_MPEG1VIDEO;
 439             psz_name = "MPEG-1/2 Video";
 440             break;
 441
 442         case FOURCC_DIV1:
 443         case FOURCC_div1:
 444         case FOURCC_MPG4:
 445         case FOURCC_mpg4:
 446             i_cat = VIDEO_ES;
 447             i_codec = CODEC_ID_MSMPEG4V1;
 448             psz_name = "MS MPEG-4 v1";
 449             break;
 450
 451         case FOURCC_DIV2:
 452         case FOURCC_div2:
 453         case FOURCC_MP42:
 454         case FOURCC_mp42:
 455             i_cat = VIDEO_ES;
 456             i_codec = CODEC_ID_MSMPEG4V2;
 457             psz_name = "MS MPEG-4 v2";
 458             break;
 459
 460         case FOURCC_MPG3:
 461         case FOURCC_mpg3:
 462         case FOURCC_div3:
 463         case FOURCC_MP43:
 464         case FOURCC_mp43:
 465         case FOURCC_DIV3:
 466         case FOURCC_DIV4:
 467         case FOURCC_div4:
 468         case FOURCC_DIV5:
 469         case FOURCC_div5:
 470         case FOURCC_DIV6:
 471         case FOURCC_div6:
 472         case FOURCC_AP41:
 473         case FOURCC_3VID:
 474         case FOURCC_3vid:
 475         case FOURCC_3IVD:
 476         case FOURCC_3ivd:
 477             i_cat = VIDEO_ES;
 478             i_codec = CODEC_ID_MSMPEG4V3;
 479             psz_name = "MS MPEG-4 v3";
 480             break;
 481
 482         case FOURCC_SVQ1:
 483             i_cat = VIDEO_ES;
 484             i_codec = CODEC_ID_SVQ1;
 485             psz_name = "SVQ-1 (Sorenson Video v1)";
 486             break;
 487 #if LIBAVCODEC_BUILD >= 4666
 488         case FOURCC_SVQ3:
 489             i_cat = VIDEO_ES;
 490             i_codec = CODEC_ID_SVQ3;
 491             psz_name = "SVQ-3 (Sorenson Video v3)";
 492             break;
 493 #endif
 494
 495         case FOURCC_DIVX:
 496         case FOURCC_divx:
 497         case FOURCC_MP4S:
 498         case FOURCC_mp4s:
 499         case FOURCC_M4S2:
 500         case FOURCC_m4s2:
 501         case FOURCC_xvid:
 502         case FOURCC_XVID:
 503         case FOURCC_XviD:
 504         case FOURCC_DX50:
 505         case FOURCC_mp4v:
 506         case FOURCC_4:
 507         /* 3iv1 is unsupported by ffmpeg
 508            putting it here gives extreme distorted images
 509         case FOURCC_3IV1:
 510         case FOURCC_3iv1:
 511         */
 512         case FOURCC_3IV2:
 513         case FOURCC_3iv2:
 514             i_cat = VIDEO_ES;
 515             i_codec = CODEC_ID_MPEG4;
 516             psz_name = "MPEG-4";
 517             break;
 518 /* FIXME FOURCC_H263P exist but what fourcc ? */
 519         case FOURCC_H263:
 520         case FOURCC_h263:
 521         case FOURCC_U263:
 522             i_cat = VIDEO_ES;
 523             i_codec = CODEC_ID_H263;
 524             psz_name = "H263";
 525             break;
 526
 527         case FOURCC_I263:
 528         case FOURCC_i263:
 529             i_cat = VIDEO_ES;
 530             i_codec = CODEC_ID_H263I;
 531             psz_name = "I263.I";
 532             break;
 533         case FOURCC_WMV1:
 534             i_cat = VIDEO_ES;
 535             i_codec = CODEC_ID_WMV1;
 536             psz_name ="Windows Media Video 1";
 537             break;
 538         case FOURCC_WMV2:
 539         case FOURCC_MSS1:
 540             i_cat = VIDEO_ES;
 541             i_codec = CODEC_ID_WMV2;
 542             psz_name ="Windows Media Video 2";
 543             break;
 544         case FOURCC_MJPG:
 545         case FOURCC_mjpg:
 546         case FOURCC_mjpa:
 547         case FOURCC_jpeg:
 548         case FOURCC_JPEG:
 549         case FOURCC_JFIF:
 550             i_cat = VIDEO_ES;
 551             i_codec = CODEC_ID_MJPEG;
 552             psz_name = "Motion JPEG";
 553             break;
 554         case FOURCC_mjpb:
 555             i_cat = VIDEO_ES;
 556             i_codec = CODEC_ID_MJPEGB;
 557             psz_name = "Motion JPEG B";
 558             break;
 559         case FOURCC_dvsl:
 560         case FOURCC_dvsd:
 561         case FOURCC_DVSD:
 562         case FOURCC_dvhd:
 563         case FOURCC_dvc:
 564         case FOURCC_dvp:
 565         case FOURCC_CDVC:
 566             i_cat = VIDEO_ES;
 567             i_codec = CODEC_ID_DVVIDEO;
 568             psz_name = "DV video";
 569             break;
 570
 571         case FOURCC_MAC3:
 572             i_cat = AUDIO_ES;
 573             i_codec = CODEC_ID_MACE3;
 574             psz_name = "MACE-3 audio";
 575             break;
 576         case FOURCC_MAC6:
 577             i_cat = AUDIO_ES;
 578             i_codec = CODEC_ID_MACE6;
 579             psz_name = "MACE-6 audio";
 580             break;
 581         case FOURCC_dvau:
 582             i_cat = AUDIO_ES;
 583             i_codec = CODEC_ID_DVAUDIO;
 584             psz_name = "DV audio";
 585             break;
 586
 587         case FOURCC_WMA1:
 588         case FOURCC_wma1:
 589             i_cat = AUDIO_ES;
 590             i_codec = CODEC_ID_WMAV1;
 591             psz_name ="Windows Media Audio 1";
 592             break;
 593         case FOURCC_WMA2:
 594         case FOURCC_wma2:
 595             i_cat = AUDIO_ES;
 596             i_codec = CODEC_ID_WMAV2;
 597             psz_name ="Windows Media Audio 2";
 598             break;
 599
 600 #if( ( LIBAVCODEC_BUILD >= 4663 ) && ( !defined( WORDS_BIGENDIAN ) ) )
 601         /* Quality of this decoder on ppc is not good */
 602         case FOURCC_IV31:
 603         case FOURCC_iv31:
 604         case FOURCC_IV32:
 605         case FOURCC_iv32:
 606             i_cat    = VIDEO_ES;
 607             i_codec  = CODEC_ID_INDEO3;
 608             psz_name = "Indeo v3";
 609             break;
 610 #endif
 611
 612 #if LIBAVCODEC_BUILD >= 4668
 613         /* Not yet finished
 614         case FOURCC_vp31:
 615         case FOURCC_VP31:
 616             i_cat    = VIDEO_ES;
 617             i_codec  = CODEC_ID_VP3;
 618             psz_name = "On2's VP3 Video";
 619             break;
 620
 621         case FOURCC_asv1:
 622         case FOURCC_ASV1:
 623             i_cat    = VIDEO_ES;
 624             i_codec  = CODEC_ID_ASV1;
 625             psz_name = "Asus V1";
 626             break; */
 627 #endif
 628
 629         default:
 630             i_cat = UNKNOWN_ES;
 631             i_codec = CODEC_ID_NONE;
 632             psz_name = NULL;
 633             break;
 634     }
 635
 636     if( i_codec != CODEC_ID_NONE )
 637     {
 638         if( pi_cat ) *pi_cat = i_cat;
 639         if( pi_ffmpeg_codec ) *pi_ffmpeg_codec = i_codec;
 640         if( ppsz_name ) *ppsz_name = psz_name;
 641         return( VLC_TRUE );
 642     }
 643
 644     return( VLC_FALSE );
 645 }