git.sesse.net Git - mlt/blob - src/modules/avformat/producer_avformat.c

   1 /*
   2  * producer_avformat.c -- avformat producer
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  * Much code borrowed from ffmpeg.c: Copyright (c) 2000-2003 Fabrice Bellard
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 // MLT Header files
  23 #include <framework/mlt_producer.h>
  24 #include <framework/mlt_frame.h>
  25 #include <framework/mlt_profile.h>
  26
  27 // ffmpeg Header files
  28 #include <avformat.h>
  29 #include <opt.h>
  30 #ifdef SWSCALE
  31 #  include <swscale.h>
  32 #endif
  33 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
  34 #  include "audioconvert.h"
  35 #endif
  36
  37 // System header files
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <pthread.h>
  41
  42 #if LIBAVUTIL_VERSION_INT < (50<<16)
  43 #define PIX_FMT_YUYV422 PIX_FMT_YUV422
  44 #endif
  45
  46 void avformat_lock( );
  47 void avformat_unlock( );
  48
  49 // Forward references.
  50 static int producer_open( mlt_producer this, mlt_profile profile, char *file );
  51 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
  52
  53 /** Constructor for libavformat.
  54 */
  55
  56 mlt_producer producer_avformat_init( mlt_profile profile, char *file )
  57 {
  58         int error = 0;
  59
  60         // Report information about available demuxers and codecs as YAML Tiny
  61         if ( file && strstr( file, "f-list" ) )
  62         {
  63                 fprintf( stderr, "---\nformats:\n" );
  64                 AVInputFormat *format = NULL;
  65                 while ( ( format = av_iformat_next( format ) ) )
  66                         fprintf( stderr, "  - %s\n", format->name );
  67                 fprintf( stderr, "...\n" );
  68                 error = 1;
  69         }
  70         if ( file && strstr( file, "acodec-list" ) )
  71         {
  72                 fprintf( stderr, "---\naudio_codecs:\n" );
  73                 AVCodec *codec = NULL;
  74                 while ( ( codec = av_codec_next( codec ) ) )
  75                         if ( codec->decode && codec->type == CODEC_TYPE_AUDIO )
  76                                 fprintf( stderr, "  - %s\n", codec->name );
  77                 fprintf( stderr, "...\n" );
  78                 error = 1;
  79         }
  80         if ( file && strstr( file, "vcodec-list" ) )
  81         {
  82                 fprintf( stderr, "---\nvideo_codecs:\n" );
  83                 AVCodec *codec = NULL;
  84                 while ( ( codec = av_codec_next( codec ) ) )
  85                         if ( codec->decode && codec->type == CODEC_TYPE_VIDEO )
  86                                 fprintf( stderr, "  - %s\n", codec->name );
  87                 fprintf( stderr, "...\n" );
  88                 error = 1;
  89         }
  90         if ( error )
  91                 return NULL;
  92
  93         mlt_producer this = NULL;
  94
  95         // Check that we have a non-NULL argument
  96         if ( file != NULL )
  97         {
  98                 // Construct the producer
  99                 this = calloc( 1, sizeof( struct mlt_producer_s ) );
 100
 101                 // Initialise it
 102                 if ( mlt_producer_init( this, NULL ) == 0 )
 103                 {
 104                         // Get the properties
 105                         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 106
 107                         // Set the resource property (required for all producers)
 108                         mlt_properties_set( properties, "resource", file );
 109
 110                         // Register our get_frame implementation
 111                         this->get_frame = producer_get_frame;
 112
 113                         // Open the file
 114                         if ( producer_open( this, profile, file ) != 0 )
 115                         {
 116                                 // Clean up
 117                                 mlt_producer_close( this );
 118                                 this = NULL;
 119                         }
 120                         else
 121                         {
 122                                 // Close the file to release resources for large playlists - reopen later as needed
 123                                 mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
 124                                 mlt_properties_set_data( properties, "audio_context", NULL, 0, NULL, NULL );
 125                                 mlt_properties_set_data( properties, "video_context", NULL, 0, NULL, NULL );
 126
 127                                 // Default the user-selectable indices from the auto-detected indices
 128                                 mlt_properties_set_int( properties, "audio_index",  mlt_properties_get_int( properties, "_audio_index" ) );
 129                                 mlt_properties_set_int( properties, "video_index",  mlt_properties_get_int( properties, "_video_index" ) );
 130                         }
 131                 }
 132         }
 133
 134         return this;
 135 }
 136
 137 /** Find the default streams.
 138 */
 139
 140 static mlt_properties find_default_streams( mlt_properties meta_media, AVFormatContext *context, int *audio_index, int *video_index )
 141 {
 142         int i;
 143         char key[200];
 144
 145         mlt_properties_set_int( meta_media, "meta.media.nb_streams", context->nb_streams );
 146
 147         // Allow for multiple audio and video streams in the file and select first of each (if available)
 148         for( i = 0; i < context->nb_streams; i++ )
 149         {
 150                 // Get the codec context
 151                 AVStream *stream = context->streams[ i ];
 152                 if ( ! stream ) continue;
 153                 AVCodecContext *codec_context = stream->codec;
 154                 if ( ! codec_context ) continue;
 155                 AVCodec *codec = avcodec_find_decoder( codec_context->codec_id );
 156                 if ( ! codec ) continue;
 157
 158                 snprintf( key, sizeof(key), "meta.media.%d.stream.type", i );
 159
 160                 // Determine the type and obtain the first index of each type
 161                 switch( codec_context->codec_type )
 162                 {
 163                         case CODEC_TYPE_VIDEO:
 164                                 if ( *video_index < 0 )
 165                                         *video_index = i;
 166                                 mlt_properties_set( meta_media, key, "video" );
 167                                 snprintf( key, sizeof(key), "meta.media.%d.stream.frame_rate", i );
 168                                 mlt_properties_set_double( meta_media, key, av_q2d( context->streams[ i ]->r_frame_rate ) );
 169 #if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(21<<8)+0)
 170                                 snprintf( key, sizeof(key), "meta.media.%d.stream.sample_aspect_ratio", i );
 171                                 mlt_properties_set_double( meta_media, key, av_q2d( context->streams[ i ]->sample_aspect_ratio ) );
 172 #endif
 173                                 snprintf( key, sizeof(key), "meta.media.%d.codec.pix_fmt", i );
 174                                 mlt_properties_set( meta_media, key, avcodec_get_pix_fmt_name( codec_context->pix_fmt ) );
 175                                 snprintf( key, sizeof(key), "meta.media.%d.codec.sample_aspect_ratio", i );
 176                                 mlt_properties_set_double( meta_media, key, av_q2d( codec_context->sample_aspect_ratio ) );
 177                                 break;
 178                         case CODEC_TYPE_AUDIO:
 179                                 if ( *audio_index < 0 )
 180                                         *audio_index = i;
 181                                 mlt_properties_set( meta_media, key, "audio" );
 182 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
 183                                 snprintf( key, sizeof(key), "meta.media.%d.codec.sample_fmt", i );
 184                                 mlt_properties_set( meta_media, key, avcodec_get_sample_fmt_name( codec_context->sample_fmt ) );
 185 #endif
 186                                 snprintf( key, sizeof(key), "meta.media.%d.codec.sample_rate", i );
 187                                 mlt_properties_set_int( meta_media, key, codec_context->sample_rate );
 188                                 snprintf( key, sizeof(key), "meta.media.%d.codec.channels", i );
 189                                 mlt_properties_set_int( meta_media, key, codec_context->channels );
 190                                 break;
 191                         default:
 192                                 break;
 193                 }
 194 //              snprintf( key, sizeof(key), "meta.media.%d.stream.time_base", i );
 195 //              mlt_properties_set_double( meta_media, key, av_q2d( context->streams[ i ]->time_base ) );
 196                 snprintf( key, sizeof(key), "meta.media.%d.codec.name", i );
 197                 mlt_properties_set( meta_media, key, codec->name );
 198 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(55<<8)+0))
 199                 snprintf( key, sizeof(key), "meta.media.%d.codec.long_name", i );
 200                 mlt_properties_set( meta_media, key, codec->long_name );
 201 #endif
 202                 snprintf( key, sizeof(key), "meta.media.%d.codec.bit_rate", i );
 203                 mlt_properties_set_int( meta_media, key, codec_context->bit_rate );
 204 //              snprintf( key, sizeof(key), "meta.media.%d.codec.time_base", i );
 205 //              mlt_properties_set_double( meta_media, key, av_q2d( codec_context->time_base ) );
 206                 snprintf( key, sizeof(key), "meta.media.%d.codec.profile", i );
 207                 mlt_properties_set_int( meta_media, key, codec_context->profile );
 208                 snprintf( key, sizeof(key), "meta.media.%d.codec.level", i );
 209                 mlt_properties_set_int( meta_media, key, codec_context->level );
 210         }
 211
 212         return meta_media;
 213 }
 214
 215 /** Producer file destructor.
 216 */
 217
 218 static void producer_file_close( void *context )
 219 {
 220         if ( context != NULL )
 221         {
 222                 // Lock the mutex now
 223                 avformat_lock( );
 224
 225                 // Close the file
 226                 av_close_input_file( context );
 227
 228                 // Unlock the mutex now
 229                 avformat_unlock( );
 230         }
 231 }
 232
 233 /** Producer file destructor.
 234 */
 235
 236 static void producer_codec_close( void *codec )
 237 {
 238         if ( codec != NULL )
 239         {
 240                 // Lock the mutex now
 241                 avformat_lock( );
 242
 243                 // Close the file
 244                 avcodec_close( codec );
 245
 246                 // Unlock the mutex now
 247                 avformat_unlock( );
 248         }
 249 }
 250
 251 static inline int dv_is_pal( AVPacket *pkt )
 252 {
 253         return pkt->data[3] & 0x80;
 254 }
 255
 256 static int dv_is_wide( AVPacket *pkt )
 257 {
 258         int i = 80 /* block size */ *3 /* VAUX starts at block 3 */ +3 /* skip block header */;
 259
 260         for ( ; i < pkt->size; i += 5 /* packet size */ )
 261         {
 262                 if ( pkt->data[ i ] == 0x61 )
 263                 {
 264                         uint8_t x = pkt->data[ i + 2 ] & 0x7;
 265                         return ( x == 2 ) || ( x == 7 );
 266                 }
 267         }
 268         return 0;
 269 }
 270
 271 static double get_aspect_ratio( AVStream *stream, AVCodecContext *codec_context, AVPacket *pkt )
 272 {
 273         double aspect_ratio = 1.0;
 274
 275         if ( codec_context->codec_id == CODEC_ID_DVVIDEO )
 276         {
 277                 if ( pkt )
 278                 {
 279                         if ( dv_is_pal( pkt ) )
 280                         {
 281                                 aspect_ratio = dv_is_wide( pkt )
 282                                         ? 64.0/45.0 // 16:9 PAL
 283                                         : 16.0/15.0; // 4:3 PAL
 284                         }
 285                         else
 286                         {
 287                                 aspect_ratio = dv_is_wide( pkt )
 288                                         ? 32.0/27.0 // 16:9 NTSC
 289                                         : 8.0/9.0; // 4:3 NTSC
 290                         }
 291                 }
 292                 else
 293                 {
 294                         AVRational ar =
 295 #if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(21<<8)+0)
 296                                 stream->sample_aspect_ratio;
 297 #else
 298                                 codec_context->sample_aspect_ratio;
 299 #endif
 300                         // Override FFmpeg's notion of DV aspect ratios, which are
 301                         // based upon a width of 704. Since we do not have a normaliser
 302                         // that crops (nor is cropping 720 wide ITU-R 601 video always desirable)
 303                         // we just coerce the values to facilitate a passive behaviour through
 304                         // the rescale normaliser when using equivalent producers and consumers.
 305                         // = display_aspect / (width * height)
 306                         if ( ar.num == 10 && ar.den == 11 )
 307                                 aspect_ratio = 8.0/9.0; // 4:3 NTSC
 308                         else if ( ar.num == 59 && ar.den == 54 )
 309                                 aspect_ratio = 16.0/15.0; // 4:3 PAL
 310                         else if ( ar.num == 40 && ar.den == 33 )
 311                                 aspect_ratio = 32.0/27.0; // 16:9 NTSC
 312                         else if ( ar.num == 118 && ar.den == 81 )
 313                                 aspect_ratio = 64.0/45.0; // 16:9 PAL
 314                 }
 315         }
 316         else
 317         {
 318                 AVRational codec_sar = codec_context->sample_aspect_ratio;
 319                 AVRational stream_sar =
 320 #if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(21<<8)+0)
 321                         stream->sample_aspect_ratio;
 322 #else
 323                         { 0, 1 };
 324 #endif
 325                 if ( codec_sar.num > 0 )
 326                         aspect_ratio = av_q2d( codec_sar );
 327                 else if ( stream_sar.num > 0 )
 328                         aspect_ratio = av_q2d( stream_sar );
 329         }
 330         return aspect_ratio;
 331 }
 332
 333 /** Open the file.
 334 */
 335
 336 static int producer_open( mlt_producer this, mlt_profile profile, char *file )
 337 {
 338         // Return an error code (0 == no error)
 339         int error = 0;
 340
 341         // Context for avformat
 342         AVFormatContext *context = NULL;
 343
 344         // Get the properties
 345         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 346
 347         // We will treat everything with the producer fps
 348         double fps = mlt_profile_fps( profile );
 349
 350         // Lock the mutex now
 351         avformat_lock( );
 352
 353         // If "MRL", then create AVInputFormat
 354         AVInputFormat *format = NULL;
 355         AVFormatParameters *params = NULL;
 356         char *standard = NULL;
 357         char *mrl = strchr( file, ':' );
 358
 359         // AV option (0 = both, 1 = video, 2 = audio)
 360         int av = 0;
 361
 362         // Setting lowest log level
 363         av_log_set_level( -1 );
 364
 365         // Only if there is not a protocol specification that avformat can handle
 366         if ( mrl && !url_exist( file ) )
 367         {
 368                 // 'file' becomes format abbreviation
 369                 mrl[0] = 0;
 370
 371                 // Lookup the format
 372                 format = av_find_input_format( file );
 373
 374                 // Eat the format designator
 375                 file = ++mrl;
 376
 377                 if ( format )
 378                 {
 379                         // Allocate params
 380                         params = calloc( sizeof( AVFormatParameters ), 1 );
 381
 382                         // These are required by video4linux (defaults)
 383                         params->width = 640;
 384                         params->height = 480;
 385                         params->time_base= (AVRational){1,25};
 386                         // params->device = file;
 387                         params->channels = 2;
 388                         params->sample_rate = 48000;
 389                 }
 390
 391                 // XXX: this does not work anymore since avdevice
 392                 // TODO: make producer_avddevice?
 393                 // Parse out params
 394                 mrl = strchr( file, '?' );
 395                 while ( mrl )
 396                 {
 397                         mrl[0] = 0;
 398                         char *name = strdup( ++mrl );
 399                         char *value = strchr( name, ':' );
 400                         if ( value )
 401                         {
 402                                 value[0] = 0;
 403                                 value++;
 404                                 char *t = strchr( value, '&' );
 405                                 if ( t )
 406                                         t[0] = 0;
 407                                 if ( !strcmp( name, "frame_rate" ) )
 408                                         params->time_base.den = atoi( value );
 409                                 else if ( !strcmp( name, "frame_rate_base" ) )
 410                                         params->time_base.num = atoi( value );
 411                                 else if ( !strcmp( name, "sample_rate" ) )
 412                                         params->sample_rate = atoi( value );
 413                                 else if ( !strcmp( name, "channels" ) )
 414                                         params->channels = atoi( value );
 415                                 else if ( !strcmp( name, "width" ) )
 416                                         params->width = atoi( value );
 417                                 else if ( !strcmp( name, "height" ) )
 418                                         params->height = atoi( value );
 419                                 else if ( !strcmp( name, "standard" ) )
 420                                 {
 421                                         standard = strdup( value );
 422                                         params->standard = standard;
 423                                 }
 424                                 else if ( !strcmp( name, "av" ) )
 425                                         av = atoi( value );
 426                         }
 427                         free( name );
 428                         mrl = strchr( mrl, '&' );
 429                 }
 430         }
 431
 432         // Now attempt to open the file
 433         error = av_open_input_file( &context, file, format, 0, params ) < 0;
 434
 435         // Cleanup AVFormatParameters
 436         free( standard );
 437         free( params );
 438
 439         // If successful, then try to get additional info
 440         if ( error == 0 )
 441         {
 442                 // Get the stream info
 443                 error = av_find_stream_info( context ) < 0;
 444
 445                 // Continue if no error
 446                 if ( error == 0 )
 447                 {
 448                         // We will default to the first audio and video streams found
 449                         int audio_index = -1;
 450                         int video_index = -1;
 451                         int av_bypass = 0;
 452
 453                         // Now set properties where we can (use default unknowns if required)
 454                         if ( context->duration != AV_NOPTS_VALUE )
 455                         {
 456                                 // This isn't going to be accurate for all formats
 457                                 mlt_position frames = ( mlt_position )( ( ( double )context->duration / ( double )AV_TIME_BASE ) * fps + 0.5 );
 458                                 mlt_properties_set_position( properties, "out", frames - 1 );
 459                                 mlt_properties_set_position( properties, "length", frames );
 460                         }
 461
 462                         // Find default audio and video streams
 463                         find_default_streams( properties, context, &audio_index, &video_index );
 464
 465                         if ( context->start_time != AV_NOPTS_VALUE )
 466                                 mlt_properties_set_double( properties, "_start_time", context->start_time );
 467
 468                         // Check if we're seekable (something funny about mpeg here :-/)
 469                         if ( strcmp( file, "pipe:" ) && strncmp( file, "http://", 6 )  && strncmp( file, "udp:", 4 )  && strncmp( file, "tcp:", 4 ) && strncmp( file, "rtsp:", 5 )  && strncmp( file, "rtp:", 4 ) )
 470                         {
 471                                 mlt_properties_set_int( properties, "seekable", av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ), AVSEEK_FLAG_BACKWARD ) >= 0 );
 472                                 mlt_properties_set_data( properties, "dummy_context", context, 0, producer_file_close, NULL );
 473                                 av_open_input_file( &context, file, NULL, 0, NULL );
 474                                 av_find_stream_info( context );
 475                         }
 476                         else
 477                                 av_bypass = 1;
 478
 479                         // Store selected audio and video indexes on properties
 480                         mlt_properties_set_int( properties, "_audio_index", audio_index );
 481                         mlt_properties_set_int( properties, "_video_index", video_index );
 482                         mlt_properties_set_int( properties, "_last_position", -1 );
 483
 484                         // Fetch the width, height and aspect ratio
 485                         if ( video_index != -1 )
 486                         {
 487                                 AVCodecContext *codec_context = context->streams[ video_index ]->codec;
 488                                 mlt_properties_set_int( properties, "width", codec_context->width );
 489                                 mlt_properties_set_int( properties, "height", codec_context->height );
 490
 491                                 if ( codec_context->codec_id == CODEC_ID_DVVIDEO )
 492                                 {
 493                                         // Fetch the first frame of DV so we can read it directly
 494                                         AVPacket pkt;
 495                                         int ret = 0;
 496                                         while ( ret >= 0 )
 497                                         {
 498                                                 ret = av_read_frame( context, &pkt );
 499                                                 if ( ret >= 0 && pkt.stream_index == video_index && pkt.size > 0 )
 500                                                 {
 501                                                         mlt_properties_set_double( properties, "aspect_ratio",
 502                                                                 get_aspect_ratio( context->streams[ video_index ], codec_context, &pkt ) );
 503                                                         break;
 504                                                 }
 505                                         }
 506                                 }
 507                                 else
 508                                 {
 509                                         mlt_properties_set_double( properties, "aspect_ratio",
 510                                                 get_aspect_ratio( context->streams[ video_index ], codec_context, NULL ) );
 511                                 }
 512                         }
 513
 514                         // Read Metadata
 515                         if (context->title != NULL)
 516                                 mlt_properties_set(properties, "meta.attr.title.markup", context->title );
 517                         if (context->author != NULL)
 518                                 mlt_properties_set(properties, "meta.attr.author.markup", context->author );
 519                         if (context->copyright != NULL)
 520                                 mlt_properties_set(properties, "meta.attr.copyright.markup", context->copyright );
 521                         if (context->comment != NULL)
 522                                 mlt_properties_set(properties, "meta.attr.comment.markup", context->comment );
 523                         if (context->album != NULL)
 524                                 mlt_properties_set(properties, "meta.attr.album.markup", context->album );
 525                         if (context->year != 0)
 526                                 mlt_properties_set_int(properties, "meta.attr.year.markup", context->year );
 527                         if (context->track != 0)
 528                                 mlt_properties_set_int(properties, "meta.attr.track.markup", context->track );
 529
 530                         // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
 531                         if ( av == 0 && audio_index != -1 && video_index != -1 )
 532                         {
 533                                 // We'll use the open one as our video_context
 534                                 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
 535
 536                                 // And open again for our audio context
 537                                 av_open_input_file( &context, file, NULL, 0, NULL );
 538                                 av_find_stream_info( context );
 539
 540                                 // Audio context
 541                                 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
 542                         }
 543                         else if ( av != 2 && video_index != -1 )
 544                         {
 545                                 // We only have a video context
 546                                 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
 547                         }
 548                         else if ( audio_index != -1 )
 549                         {
 550                                 // We only have an audio context
 551                                 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
 552                         }
 553                         else
 554                         {
 555                                 // Something has gone wrong
 556                                 error = -1;
 557                         }
 558
 559                         mlt_properties_set_int( properties, "av_bypass", av_bypass );
 560                 }
 561         }
 562
 563         // Unlock the mutex now
 564         avformat_unlock( );
 565
 566         return error;
 567 }
 568
 569 /** Convert a frame position to a time code.
 570 */
 571
 572 static double producer_time_of_frame( mlt_producer this, mlt_position position )
 573 {
 574         return ( double )position / mlt_producer_get_fps( this );
 575 }
 576
 577 static inline void convert_image( AVFrame *frame, uint8_t *buffer, int pix_fmt, mlt_image_format format, int width, int height )
 578 {
 579 #ifdef SWSCALE
 580         if ( format == mlt_image_yuv420p )
 581         {
 582                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 583                         width, height, PIX_FMT_YUV420P, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 584                 AVPicture output;
 585                 output.data[0] = buffer;
 586                 output.data[1] = buffer + width * height;
 587                 output.data[2] = buffer + ( 3 * width * height ) / 2;
 588                 output.linesize[0] = width;
 589                 output.linesize[1] = width >> 1;
 590                 output.linesize[2] = width >> 1;
 591                 sws_scale( context, frame->data, frame->linesize, 0, height,
 592                         output.data, output.linesize);
 593                 sws_freeContext( context );
 594         }
 595         else if ( format == mlt_image_rgb24 )
 596         {
 597                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 598                         width, height, PIX_FMT_RGB24, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 599                 AVPicture output;
 600                 avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
 601                 sws_scale( context, frame->data, frame->linesize, 0, height,
 602                         output.data, output.linesize);
 603                 sws_freeContext( context );
 604         }
 605         else
 606         {
 607                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 608                         width, height, PIX_FMT_YUYV422, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 609                 AVPicture output;
 610                 avpicture_fill( &output, buffer, PIX_FMT_YUYV422, width, height );
 611                 sws_scale( context, frame->data, frame->linesize, 0, height,
 612                         output.data, output.linesize);
 613                 sws_freeContext( context );
 614         }
 615 #else
 616         if ( format == mlt_image_yuv420p )
 617         {
 618                 AVPicture pict;
 619                 pict.data[0] = buffer;
 620                 pict.data[1] = buffer + width * height;
 621                 pict.data[2] = buffer + ( 3 * width * height ) / 2;
 622                 pict.linesize[0] = width;
 623                 pict.linesize[1] = width >> 1;
 624                 pict.linesize[2] = width >> 1;
 625                 img_convert( &pict, PIX_FMT_YUV420P, (AVPicture *)frame, pix_fmt, width, height );
 626         }
 627         else if ( format == mlt_image_rgb24 )
 628         {
 629                 AVPicture output;
 630                 avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
 631                 img_convert( &output, PIX_FMT_RGB24, (AVPicture *)frame, pix_fmt, width, height );
 632         }
 633         else
 634         {
 635                 AVPicture output;
 636                 avpicture_fill( &output, buffer, PIX_FMT_YUYV422, width, height );
 637                 img_convert( &output, PIX_FMT_YUYV422, (AVPicture *)frame, pix_fmt, width, height );
 638         }
 639 #endif
 640 }
 641
 642 /** Allocate the image buffer and set it on the frame.
 643 */
 644
 645 static int allocate_buffer( mlt_properties frame_properties, AVCodecContext *codec_context, uint8_t **buffer, mlt_image_format *format, int *width, int *height )
 646 {
 647         int size = 0;
 648
 649         if ( codec_context->width == 0 || codec_context->height == 0 )
 650                 return size;
 651
 652         *width = codec_context->width;
 653         *height = codec_context->height;
 654         mlt_properties_set_int( frame_properties, "width", *width );
 655         mlt_properties_set_int( frame_properties, "height", *height );
 656
 657         switch ( *format )
 658         {
 659                 case mlt_image_yuv420p:
 660                         size = *width * 3 * ( *height + 1 ) / 2;
 661                         break;
 662                 case mlt_image_rgb24:
 663                         size = *width * ( *height + 1 ) * 3;
 664                         break;
 665                 default:
 666                         *format = mlt_image_yuv422;
 667                         size = *width * ( *height + 1 ) * 2;
 668                         break;
 669         }
 670
 671         // Construct the output image
 672         *buffer = mlt_pool_alloc( size );
 673         if ( *buffer )
 674                 mlt_properties_set_data( frame_properties, "image", *buffer, size, (mlt_destructor)mlt_pool_release, NULL );
 675         else
 676                 size = 0;
 677
 678         return size;
 679 }
 680
 681 /** Get an image from a frame.
 682 */
 683
 684 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 685 {
 686         // Get the properties from the frame
 687         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 688
 689         // Obtain the frame number of this frame
 690         mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
 691
 692         // Get the producer
 693         mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
 694
 695         // Get the producer properties
 696         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 697
 698         // Fetch the video_context
 699         AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
 700
 701         // Get the video_index
 702         int index = mlt_properties_get_int( properties, "video_index" );
 703
 704         // Obtain the expected frame numer
 705         mlt_position expected = mlt_properties_get_position( properties, "_video_expected" );
 706
 707         // Get the video stream
 708         AVStream *stream = context->streams[ index ];
 709
 710         // Get codec context
 711         AVCodecContext *codec_context = stream->codec;
 712
 713         // Packet
 714         AVPacket pkt;
 715
 716         // Get the conversion frame
 717         AVFrame *av_frame = mlt_properties_get_data( properties, "av_frame", NULL );
 718
 719         // Special case pause handling flag
 720         int paused = 0;
 721
 722         // Special case ffwd handling
 723         int ignore = 0;
 724
 725         // We may want to use the source fps if available
 726         double source_fps = mlt_properties_get_double( properties, "source_fps" );
 727         double fps = mlt_producer_get_fps( this );
 728
 729         // This is the physical frame position in the source
 730         int req_position = ( int )( position / fps * source_fps + 0.5 );
 731
 732         // Get the seekable status
 733         int seekable = mlt_properties_get_int( properties, "seekable" );
 734
 735         // Hopefully provide better support for streams...
 736         int av_bypass = mlt_properties_get_int( properties, "av_bypass" );
 737
 738         // Determines if we have to decode all frames in a sequence
 739         int must_decode = 1;
 740
 741         // Temporary hack to improve intra frame only
 742         must_decode = strcmp( codec_context->codec->name, "dnxhd" ) &&
 743                                   strcmp( codec_context->codec->name, "dvvideo" ) &&
 744                                   strcmp( codec_context->codec->name, "huffyuv" ) &&
 745                                   strcmp( codec_context->codec->name, "mjpeg" ) &&
 746                                   strcmp( codec_context->codec->name, "rawvideo" );
 747
 748         // Seek if necessary
 749         if ( position != expected )
 750         {
 751                 if ( av_frame != NULL && position + 1 == expected )
 752                 {
 753                         // We're paused - use last image
 754                         paused = 1;
 755                 }
 756                 else if ( !seekable && position > expected && ( position - expected ) < 250 )
 757                 {
 758                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
 759                         ignore = ( int )( ( position - expected ) / fps * source_fps );
 760                 }
 761                 else if ( seekable && ( position < expected || position - expected >= 12 ) )
 762                 {
 763                         // Calculate the timestamp for the requested frame
 764                         int64_t timestamp = ( int64_t )( ( double )req_position / source_fps * AV_TIME_BASE + 0.5 );
 765                         if ( ( uint64_t )context->start_time != AV_NOPTS_VALUE )
 766                                 timestamp += context->start_time;
 767                         if ( must_decode )
 768                                 timestamp -= AV_TIME_BASE;
 769                         if ( timestamp < 0 )
 770                                 timestamp = 0;
 771
 772                         // Set to the timestamp
 773                         av_seek_frame( context, -1, timestamp, AVSEEK_FLAG_BACKWARD );
 774
 775                         // Remove the cached info relating to the previous position
 776                         mlt_properties_set_int( properties, "_current_position", -1 );
 777                         mlt_properties_set_int( properties, "_last_position", -1 );
 778                         mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
 779                         av_frame = NULL;
 780                 }
 781         }
 782
 783         // Duplicate the last image if necessary (see comment on rawvideo below)
 784         int current_position = mlt_properties_get_int( properties, "_current_position" );
 785         int got_picture = mlt_properties_get_int( properties, "_got_picture" );
 786         if ( av_frame != NULL && got_picture && ( paused || current_position >= req_position ) && av_bypass == 0 )
 787         {
 788                 // Duplicate it
 789                 if ( allocate_buffer( frame_properties, codec_context, buffer, format, width, height ) )
 790                         convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
 791                 else
 792                         mlt_frame_get_image( frame, buffer, format, width, height, writable );
 793         }
 794         else
 795         {
 796                 int ret = 0;
 797                 int int_position = 0;
 798                 got_picture = 0;
 799
 800                 av_init_packet( &pkt );
 801
 802                 // Construct an AVFrame for YUV422 conversion
 803                 if ( av_frame == NULL )
 804                         av_frame = avcodec_alloc_frame( );
 805
 806                 while( ret >= 0 && !got_picture )
 807                 {
 808                         // Read a packet
 809                         ret = av_read_frame( context, &pkt );
 810
 811                         // We only deal with video from the selected video_index
 812                         if ( ret >= 0 && pkt.stream_index == index && pkt.size > 0 )
 813                         {
 814                                 // Determine time code of the packet
 815                                 int_position = ( int )( av_q2d( stream->time_base ) * pkt.dts * source_fps + 0.5 );
 816                                 if ( context->start_time != AV_NOPTS_VALUE )
 817                                         int_position -= ( int )( context->start_time * source_fps / AV_TIME_BASE + 0.5 );
 818                                 int last_position = mlt_properties_get_int( properties, "_last_position" );
 819                                 if ( int_position == last_position )
 820                                         int_position = last_position + 1;
 821                                 mlt_properties_set_int( properties, "_last_position", int_position );
 822
 823                                 // Decode the image
 824                                 if ( must_decode || int_position >= req_position )
 825                                         ret = avcodec_decode_video( codec_context, av_frame, &got_picture, pkt.data, pkt.size );
 826
 827                                 if ( got_picture )
 828                                 {
 829                                         // Handle ignore
 830                                         if ( int_position < req_position )
 831                                         {
 832                                                 ignore = 0;
 833                                                 got_picture = 0;
 834                                         }
 835                                         else if ( int_position >= req_position )
 836                                         {
 837                                                 ignore = 0;
 838                                         }
 839                                         else if ( ignore -- )
 840                                         {
 841                                                 got_picture = 0;
 842                                         }
 843                                 }
 844                                 av_free_packet( &pkt );
 845                         }
 846                         else if ( ret >= 0 )
 847                         {
 848                                 av_free_packet( &pkt );
 849                         }
 850
 851                         // Now handle the picture if we have one
 852                         if ( got_picture )
 853                         {
 854                                 if ( allocate_buffer( frame_properties, codec_context, buffer, format, width, height ) )
 855                                 {
 856                                         convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
 857                                         mlt_properties_set_int( frame_properties, "progressive", !av_frame->interlaced_frame );
 858                                         mlt_properties_set_int( properties, "top_field_first", av_frame->top_field_first );
 859                                         mlt_properties_set_int( properties, "_current_position", int_position );
 860                                         mlt_properties_set_int( properties, "_got_picture", 1 );
 861                                         mlt_properties_set_data( properties, "av_frame", av_frame, 0, av_free, NULL );
 862                                 }
 863                                 else
 864                                 {
 865                                         got_picture = 0;
 866                                 }
 867                         }
 868                 }
 869                 if ( !got_picture )
 870                         mlt_frame_get_image( frame, buffer, format, width, height, writable );
 871         }
 872
 873         // Very untidy - for rawvideo, the packet contains the frame, hence the free packet
 874         // above will break the pause behaviour - so we wipe the frame now
 875         if ( !strcmp( codec_context->codec->name, "rawvideo" ) )
 876                 mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
 877
 878         // Set the field order property for this frame
 879         mlt_properties_set_int( frame_properties, "top_field_first", mlt_properties_get_int( properties, "top_field_first" ) );
 880
 881         // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
 882         mlt_properties_set_position( properties, "_video_expected", position + 1 );
 883
 884         return 0;
 885 }
 886
 887 /** Process properties as AVOptions and apply to AV context obj
 888 */
 889
 890 static void apply_properties( void *obj, mlt_properties properties, int flags )
 891 {
 892         int i;
 893         int count = mlt_properties_count( properties );
 894         for ( i = 0; i < count; i++ )
 895         {
 896                 const char *opt_name = mlt_properties_get_name( properties, i );
 897                 const AVOption *opt = av_find_opt( obj, opt_name, NULL, flags, flags );
 898                 if ( opt != NULL )
 899 #if LIBAVCODEC_VERSION_INT >= ((52<<16)+(7<<8)+0)
 900                         av_set_string3( obj, opt_name, mlt_properties_get( properties, opt_name), 0, NULL );
 901 #elif LIBAVCODEC_VERSION_INT >= ((51<<16)+(59<<8)+0)
 902                         av_set_string2( obj, opt_name, mlt_properties_get( properties, opt_name), 0 );
 903 #else
 904                         av_set_string( obj, opt_name, mlt_properties_get( properties, opt_name) );
 905 #endif
 906         }
 907 }
 908
 909 /** Set up video handling.
 910 */
 911
 912 static void producer_set_up_video( mlt_producer this, mlt_frame frame )
 913 {
 914         // Get the properties
 915         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 916
 917         // Fetch the video_context
 918         AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
 919
 920         // Get the video_index
 921         int index = mlt_properties_get_int( properties, "video_index" );
 922
 923         // Reopen the file if necessary
 924         if ( !context && index > -1 )
 925         {
 926                 mlt_events_block( properties, this );
 927                 producer_open( this, mlt_service_profile( MLT_PRODUCER_SERVICE(this) ),
 928                         mlt_properties_get( properties, "resource" ) );
 929                 context = mlt_properties_get_data( properties, "video_context", NULL );
 930                 mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
 931                 mlt_events_unblock( properties, this );
 932
 933                 // Process properties as AVOptions
 934                 apply_properties( context, properties, AV_OPT_FLAG_DECODING_PARAM );
 935         }
 936
 937         // Exception handling for video_index
 938         if ( context && index >= (int) context->nb_streams )
 939         {
 940                 // Get the last video stream
 941                 for ( index = context->nb_streams - 1; index >= 0 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_VIDEO; --index );
 942                 mlt_properties_set_int( properties, "video_index", index );
 943         }
 944         if ( context && index > -1 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_VIDEO )
 945         {
 946                 // Invalidate the video stream
 947                 index = -1;
 948                 mlt_properties_set_int( properties, "video_index", index );
 949         }
 950
 951         // Get the frame properties
 952         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 953
 954         if ( context && index > -1 )
 955         {
 956                 // Get the video stream
 957                 AVStream *stream = context->streams[ index ];
 958
 959                 // Get codec context
 960                 AVCodecContext *codec_context = stream->codec;
 961
 962                 // Get the codec
 963                 AVCodec *codec = mlt_properties_get_data( properties, "video_codec", NULL );
 964
 965                 // Update the video properties if the index changed
 966                 if ( index != mlt_properties_get_int( properties, "_video_index" ) )
 967                 {
 968                         // Reset the video properties if the index changed
 969                         mlt_properties_set_int( properties, "_video_index", index );
 970                         mlt_properties_set_data( properties, "video_codec", NULL, 0, NULL, NULL );
 971                         mlt_properties_set_int( properties, "width", codec_context->width );
 972                         mlt_properties_set_int( properties, "height", codec_context->height );
 973                         // TODO: get the first usable AVPacket and reset the stream position
 974                         mlt_properties_set_double( properties, "aspect_ratio",
 975                                 get_aspect_ratio( context->streams[ index ], codec_context, NULL ) );
 976                         codec = NULL;
 977                 }
 978
 979                 // Initialise the codec if necessary
 980                 if ( codec == NULL )
 981                 {
 982                         // Initialise multi-threading
 983                         int thread_count = mlt_properties_get_int( properties, "threads" );
 984                         if ( thread_count == 0 && getenv( "MLT_AVFORMAT_THREADS" ) )
 985                                 thread_count = atoi( getenv( "MLT_AVFORMAT_THREADS" ) );
 986                         if ( thread_count > 1 )
 987                         {
 988                                 avcodec_thread_init( codec_context, thread_count );
 989                                 codec_context->thread_count = thread_count;
 990                         }
 991
 992                         // Find the codec
 993                         codec = avcodec_find_decoder( codec_context->codec_id );
 994
 995                         // If we don't have a codec and we can't initialise it, we can't do much more...
 996                         avformat_lock( );
 997                         if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
 998                         {
 999                                 // Now store the codec with its destructor
1000                                 mlt_properties_set_data( properties, "video_codec", codec_context, 0, producer_codec_close, NULL );
1001                         }
1002                         else
1003                         {
1004                                 // Remember that we can't use this later
1005                                 mlt_properties_set_int( properties, "video_index", -1 );
1006                                 index = -1;
1007                         }
1008                         avformat_unlock( );
1009
1010                         // Process properties as AVOptions
1011                         apply_properties( codec_context, properties, AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM );
1012                 }
1013
1014                 // No codec, no show...
1015                 if ( codec && index > -1 )
1016                 {
1017                         double source_fps = 0;
1018                         double force_aspect_ratio = mlt_properties_get_double( properties, "force_aspect_ratio" );
1019                         double aspect_ratio = ( force_aspect_ratio > 0.0 ) ?
1020                                 force_aspect_ratio : mlt_properties_get_double( properties, "aspect_ratio" );
1021
1022                         // Determine the fps
1023                         source_fps = ( double )codec_context->time_base.den / ( codec_context->time_base.num == 0 ? 1 : codec_context->time_base.num );
1024
1025                         // We'll use fps if it's available
1026                         if ( source_fps > 0 )
1027                                 mlt_properties_set_double( properties, "source_fps", source_fps );
1028                         else
1029                                 mlt_properties_set_double( properties, "source_fps", mlt_producer_get_fps( this ) );
1030                         mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
1031
1032                         // Set the width and height
1033                         mlt_properties_set_int( frame_properties, "width", codec_context->width );
1034                         mlt_properties_set_int( frame_properties, "height", codec_context->height );
1035                         mlt_properties_set_int( frame_properties, "real_width", codec_context->width );
1036                         mlt_properties_set_int( frame_properties, "real_height", codec_context->height );
1037                         mlt_properties_set_double( frame_properties, "aspect_ratio", aspect_ratio );
1038
1039                         mlt_frame_push_get_image( frame, producer_get_image );
1040                         mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
1041                 }
1042                 else
1043                 {
1044                         mlt_properties_set_int( frame_properties, "test_image", 1 );
1045                 }
1046         }
1047         else
1048         {
1049                 mlt_properties_set_int( frame_properties, "test_image", 1 );
1050         }
1051 }
1052
1053 /** Get the audio from a frame.
1054 */
1055
1056 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
1057 {
1058         // Get the properties from the frame
1059         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
1060
1061         // Obtain the frame number of this frame
1062         mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
1063
1064         // Get the producer
1065         mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
1066
1067         // Get the producer properties
1068         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
1069
1070         // Fetch the audio_context
1071         AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
1072
1073         // Get the audio_index
1074         int index = mlt_properties_get_int( properties, "audio_index" );
1075
1076         // Get the seekable status
1077         int seekable = mlt_properties_get_int( properties, "seekable" );
1078
1079         // Obtain the expected frame numer
1080         mlt_position expected = mlt_properties_get_position( properties, "_audio_expected" );
1081
1082         // Obtain the resample context if it exists (not always needed)
1083         ReSampleContext *resample = mlt_properties_get_data( properties, "audio_resample", NULL );
1084
1085 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
1086         // Get the format converter context if it exists
1087         AVAudioConvert *convert = mlt_properties_get_data( properties, "audio_convert", NULL );
1088 #endif
1089
1090         // Obtain the audio buffers
1091         int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
1092         int16_t *decode_buffer = mlt_properties_get_data( properties, "decode_buffer", NULL );
1093         int16_t *convert_buffer = mlt_properties_get_data( properties, "convert_buffer", NULL );
1094
1095         // Get amount of audio used
1096         int audio_used =  mlt_properties_get_int( properties, "_audio_used" );
1097
1098         // Calculate the real time code
1099         double real_timecode = producer_time_of_frame( this, position );
1100
1101         // Get the audio stream
1102         AVStream *stream = context->streams[ index ];
1103
1104         // Get codec context
1105         AVCodecContext *codec_context = stream->codec;
1106
1107         // Packet
1108         AVPacket pkt;
1109
1110         // Number of frames to ignore (for ffwd)
1111         int ignore = 0;
1112
1113         // Flag for paused (silence)
1114         int paused = 0;
1115
1116         // Check for resample and create if necessary
1117         if ( resample == NULL && codec_context->channels <= 2 )
1118         {
1119                 // Create the resampler
1120                 resample = audio_resample_init( *channels, codec_context->channels, *frequency, codec_context->sample_rate );
1121
1122                 // And store it on properties
1123                 mlt_properties_set_data( properties, "audio_resample", resample, 0, ( mlt_destructor )audio_resample_close, NULL );
1124         }
1125         else if ( resample == NULL )
1126         {
1127                 *channels = codec_context->channels;
1128                 *frequency = codec_context->sample_rate;
1129         }
1130
1131 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
1132         // Check for audio format converter and create if necessary
1133         // TODO: support higher resolutions than 16-bit.
1134         if ( convert == NULL && codec_context->sample_fmt != SAMPLE_FMT_S16 )
1135         {
1136                 // Create single channel converter for interleaved with no mixing matrix
1137                 convert = av_audio_convert_alloc( SAMPLE_FMT_S16, 1, codec_context->sample_fmt, 1, NULL, 0 );
1138                 mlt_properties_set_data( properties, "audio_convert", convert, 0, ( mlt_destructor )av_audio_convert_free, NULL );
1139         }
1140 #endif
1141
1142         // Check for audio buffer and create if necessary
1143         if ( audio_buffer == NULL )
1144         {
1145                 // Allocate the audio buffer
1146                 audio_buffer = mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
1147
1148                 // And store it on properties for reuse
1149                 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
1150         }
1151
1152         // Check for decoder buffer and create if necessary
1153         if ( decode_buffer == NULL )
1154         {
1155                 // Allocate the audio buffer
1156                 decode_buffer = av_malloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
1157
1158                 // And store it on properties for reuse
1159                 mlt_properties_set_data( properties, "decode_buffer", decode_buffer, 0, ( mlt_destructor )av_free, NULL );
1160         }
1161
1162 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
1163         // Check for format converter buffer and create if necessary
1164         if ( resample && convert && convert_buffer == NULL )
1165         {
1166                 // Allocate the audio buffer
1167                 convert_buffer = mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
1168
1169                 // And store it on properties for reuse
1170                 mlt_properties_set_data( properties, "convert_buffer", convert_buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
1171         }
1172 #endif
1173
1174         // Seek if necessary
1175         if ( position != expected )
1176         {
1177                 if ( position + 1 == expected )
1178                 {
1179                         // We're paused - silence required
1180                         paused = 1;
1181                 }
1182                 else if ( !seekable && position > expected && ( position - expected ) < 250 )
1183                 {
1184                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
1185                         ignore = position - expected;
1186                 }
1187                 else if ( position < expected || position - expected >= 12 )
1188                 {
1189                         int64_t timestamp = ( int64_t )( real_timecode * AV_TIME_BASE + 0.5 );
1190                         if ( context->start_time != AV_NOPTS_VALUE )
1191                                 timestamp += context->start_time;
1192                         if ( timestamp < 0 )
1193                                 timestamp = 0;
1194
1195                         // Set to the real timecode
1196                         if ( av_seek_frame( context, -1, timestamp, AVSEEK_FLAG_BACKWARD ) != 0 )
1197                                 paused = 1;
1198
1199                         // Clear the usage in the audio buffer
1200                         audio_used = 0;
1201                 }
1202         }
1203
1204         // Get the audio if required
1205         if ( !paused )
1206         {
1207                 int ret = 0;
1208                 int got_audio = 0;
1209
1210                 av_init_packet( &pkt );
1211
1212                 while( ret >= 0 && !got_audio )
1213                 {
1214                         // Check if the buffer already contains the samples required
1215                         if ( audio_used >= *samples && ignore == 0 )
1216                         {
1217                                 got_audio = 1;
1218                                 break;
1219                         }
1220
1221                         // Read a packet
1222                         ret = av_read_frame( context, &pkt );
1223
1224                         int len = pkt.size;
1225                         uint8_t *ptr = pkt.data;
1226
1227                         // We only deal with audio from the selected audio_index
1228                         while ( ptr != NULL && ret >= 0 && pkt.stream_index == index && len > 0 )
1229                         {
1230                                 int data_size = sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE;
1231
1232                                 // Decode the audio
1233 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(29<<8)+0))
1234                                 ret = avcodec_decode_audio2( codec_context, decode_buffer, &data_size, ptr, len );
1235 #else
1236                                 ret = avcodec_decode_audio( codec_context, decode_buffer, &data_size, ptr, len );
1237 #endif
1238                                 if ( ret < 0 )
1239                                 {
1240                                         ret = 0;
1241                                         break;
1242                                 }
1243
1244                                 len -= ret;
1245                                 ptr += ret;
1246
1247                                 if ( data_size > 0 )
1248                                 {
1249                                         int src_stride[6]= { av_get_bits_per_sample_format( codec_context->sample_fmt ) / 8 };
1250                                         int dst_stride[6]= { av_get_bits_per_sample_format( SAMPLE_FMT_S16 ) / 8 };
1251
1252                                         if ( resample )
1253                                         {
1254                                                 int16_t *source = decode_buffer;
1255                                                 int16_t *dest = &audio_buffer[ audio_used * *channels ];
1256                                                 int convert_samples = data_size / src_stride[0];
1257
1258 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
1259                                                 if ( convert )
1260                                                 {
1261                                                         const void *src_buf[6] = { decode_buffer };
1262                                                         void *dst_buf[6] = { convert_buffer };
1263                                                         av_audio_convert( convert, dst_buf, dst_stride, src_buf, src_stride, convert_samples );
1264                                                         source = convert_buffer;
1265                                                 }
1266 #endif
1267                                                 audio_used += audio_resample( resample, dest, source, convert_samples / codec_context->channels );
1268                                         }
1269                                         else
1270                                         {
1271 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
1272                                                 if ( convert )
1273                                                 {
1274                                                         const void *src_buf[6] = { decode_buffer };
1275                                                         void *dst_buf[6] = { &audio_buffer[ audio_used * *channels ] };
1276                                                         av_audio_convert( convert, dst_buf, dst_stride, src_buf, src_stride, data_size / src_stride[0] );
1277                                                 }
1278                                                 else
1279 #endif
1280                                                 {
1281                                                         memcpy( &audio_buffer[ audio_used * *channels ], decode_buffer, data_size );
1282                                                 }
1283                                                 audio_used += data_size / *channels / src_stride[0];
1284                                         }
1285
1286                                         // Handle ignore
1287                                         while ( ignore && audio_used > *samples )
1288                                         {
1289                                                 ignore --;
1290                                                 audio_used -= *samples;
1291                                                 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
1292                                         }
1293                                 }
1294
1295                                 // If we're behind, ignore this packet
1296                                 if ( pkt.pts >= 0 )
1297                                 {
1298                                         double current_pts = av_q2d( stream->time_base ) * pkt.pts;
1299                                         double source_fps = mlt_properties_get_double( properties, "source_fps" );
1300                                         int req_position = ( int )( real_timecode * source_fps + 0.5 );
1301                                         int int_position = ( int )( current_pts * source_fps + 0.5 );
1302
1303                                         if ( context->start_time != AV_NOPTS_VALUE )
1304                                                 int_position -= ( int )( context->start_time * source_fps / AV_TIME_BASE + 0.5 );
1305                                         if ( seekable && !ignore && int_position < req_position )
1306                                                 ignore = 1;
1307                                 }
1308                         }
1309
1310                         // We're finished with this packet regardless
1311                         av_free_packet( &pkt );
1312                 }
1313
1314                 *buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
1315                 mlt_properties_set_data( frame_properties, "audio", *buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
1316
1317                 // Now handle the audio if we have enough
1318                 if ( audio_used >= *samples )
1319                 {
1320                         memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
1321                         audio_used -= *samples;
1322                         memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
1323                 }
1324                 else
1325                 {
1326                         memset( *buffer, 0, *samples * *channels * sizeof( int16_t ) );
1327                 }
1328
1329                 // Store the number of audio samples still available
1330                 mlt_properties_set_int( properties, "_audio_used", audio_used );
1331         }
1332         else
1333         {
1334                 // Get silence and don't touch the context
1335                 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
1336         }
1337
1338         // Regardless of speed (other than paused), we expect to get the next frame
1339         if ( !paused )
1340                 mlt_properties_set_position( properties, "_audio_expected", position + 1 );
1341
1342         return 0;
1343 }
1344
1345 /** Set up audio handling.
1346 */
1347
1348 static void producer_set_up_audio( mlt_producer this, mlt_frame frame )
1349 {
1350         // Get the properties
1351         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
1352
1353         // Fetch the audio_context
1354         AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
1355
1356         // Get the audio_index
1357         int index = mlt_properties_get_int( properties, "audio_index" );
1358
1359         // Reopen the file if necessary
1360         if ( !context && index > -1 )
1361         {
1362                 mlt_events_block( properties, this );
1363                 producer_open( this, mlt_service_profile( MLT_PRODUCER_SERVICE(this) ),
1364                         mlt_properties_get( properties, "resource" ) );
1365                 context = mlt_properties_get_data( properties, "audio_context", NULL );
1366                 mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
1367                 mlt_events_unblock( properties, this );
1368         }
1369
1370         // Exception handling for audio_index
1371         if ( context && index >= (int) context->nb_streams )
1372         {
1373                 for ( index = context->nb_streams - 1; index >= 0 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_AUDIO; --index );
1374                 mlt_properties_set_int( properties, "audio_index", index );
1375         }
1376         if ( context && index > -1 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_AUDIO )
1377         {
1378                 index = -1;
1379                 mlt_properties_set_int( properties, "audio_index", index );
1380         }
1381
1382         // Update the audio properties if the index changed
1383         if ( index > -1 && index != mlt_properties_get_int( properties, "_audio_index" ) )
1384         {
1385                 mlt_properties_set_int( properties, "_audio_index", index );
1386                 mlt_properties_set_data( properties, "audio_codec", NULL, 0, NULL, NULL );
1387         }
1388
1389         // Deal with audio context
1390         if ( context != NULL && index > -1 )
1391         {
1392                 // Get the frame properties
1393                 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
1394
1395                 // Get the audio stream
1396                 AVStream *stream = context->streams[ index ];
1397
1398                 // Get codec context
1399                 AVCodecContext *codec_context = stream->codec;
1400
1401                 // Get the codec
1402                 AVCodec *codec = mlt_properties_get_data( properties, "audio_codec", NULL );
1403
1404                 // Initialise the codec if necessary
1405                 if ( codec == NULL )
1406                 {
1407                         // Find the codec
1408                         codec = avcodec_find_decoder( codec_context->codec_id );
1409
1410                         // If we don't have a codec and we can't initialise it, we can't do much more...
1411                         avformat_lock( );
1412                         if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
1413                         {
1414                                 // Now store the codec with its destructor
1415                                 mlt_properties_set_data( properties, "audio_codec", codec_context, 0, producer_codec_close, NULL );
1416
1417                         }
1418                         else
1419                         {
1420                                 // Remember that we can't use this later
1421                                 mlt_properties_set_int( properties, "audio_index", -1 );
1422                                 index = -1;
1423                         }
1424                         avformat_unlock( );
1425
1426                         // Process properties as AVOptions
1427                         apply_properties( codec_context, properties, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM );
1428                 }
1429
1430                 // No codec, no show...
1431                 if ( codec && index > -1 )
1432                 {
1433                         mlt_frame_push_audio( frame, producer_get_audio );
1434                         mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
1435                         mlt_properties_set_int( frame_properties, "frequency", codec_context->sample_rate );
1436                         mlt_properties_set_int( frame_properties, "channels", codec_context->channels );
1437                 }
1438         }
1439 }
1440
1441 /** Our get frame implementation.
1442 */
1443
1444 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
1445 {
1446         // Create an empty frame
1447         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
1448
1449         // Update timecode on the frame we're creating
1450         mlt_frame_set_position( *frame, mlt_producer_position( this ) );
1451
1452         // Set the position of this producer
1453         mlt_properties_set_position( MLT_FRAME_PROPERTIES( *frame ), "avformat_position", mlt_producer_frame( this ) );
1454
1455         // Set up the video
1456         producer_set_up_video( this, *frame );
1457
1458         // Set up the audio
1459         producer_set_up_audio( this, *frame );
1460
1461         // Set the aspect_ratio
1462         mlt_properties_set_double( MLT_FRAME_PROPERTIES( *frame ), "aspect_ratio", mlt_properties_get_double( MLT_PRODUCER_PROPERTIES( this ), "aspect_ratio" ) );
1463
1464         // Calculate the next timecode
1465         mlt_producer_prepare_next( this );
1466
1467         return 0;
1468 }