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
  26 // ffmpeg Header files
  27 #include <avformat.h>
  28 #include <opt.h>
  29 #ifdef SWSCALE
  30 #  include <swscale.h>
  31 #endif
  32 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
  33 #  include "audioconvert.h"
  34 #endif
  35
  36 // System header files
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <pthread.h>
  40 #include <math.h>
  41
  42 void avformat_lock( );
  43 void avformat_unlock( );
  44
  45 // Forward references.
  46 static int producer_open( mlt_producer this, mlt_profile profile, char *file );
  47 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
  48
  49 /** Constructor for libavformat.
  50 */
  51
  52 mlt_producer producer_avformat_init( mlt_profile profile, char *file )
  53 {
  54         mlt_producer this = NULL;
  55
  56         // Check that we have a non-NULL argument
  57         if ( file != NULL )
  58         {
  59                 // Construct the producer
  60                 this = calloc( 1, sizeof( struct mlt_producer_s ) );
  61
  62                 // Initialise it
  63                 if ( mlt_producer_init( this, NULL ) == 0 )
  64                 {
  65                         // Get the properties
  66                         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
  67
  68                         // Set the resource property (required for all producers)
  69                         mlt_properties_set( properties, "resource", file );
  70
  71                         // Register our get_frame implementation
  72                         this->get_frame = producer_get_frame;
  73
  74                         // Open the file
  75                         if ( producer_open( this, profile, file ) != 0 )
  76                         {
  77                                 // Clean up
  78                                 mlt_producer_close( this );
  79                                 this = NULL;
  80                         }
  81                         else
  82                         {
  83                                 // Close the file to release resources for large playlists - reopen later as needed
  84                                 mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
  85                                 mlt_properties_set_data( properties, "audio_context", NULL, 0, NULL, NULL );
  86                                 mlt_properties_set_data( properties, "video_context", NULL, 0, NULL, NULL );
  87
  88                                 // Default the user-selectable indices from the auto-detected indices
  89                                 mlt_properties_set_int( properties, "audio_index",  mlt_properties_get_int( properties, "_audio_index" ) );
  90                                 mlt_properties_set_int( properties, "video_index",  mlt_properties_get_int( properties, "_video_index" ) );
  91                         }
  92                 }
  93         }
  94
  95         return this;
  96 }
  97
  98 /** Find the default streams.
  99 */
 100
 101 static mlt_properties find_default_streams( mlt_properties meta_media, AVFormatContext *context, int *audio_index, int *video_index )
 102 {
 103         int i;
 104         char key[200];
 105
 106         mlt_properties_set_int( meta_media, "meta.media.nb_streams", context->nb_streams );
 107
 108         // Allow for multiple audio and video streams in the file and select first of each (if available)
 109         for( i = 0; i < context->nb_streams; i++ )
 110         {
 111                 // Get the codec context
 112                 AVStream *stream = context->streams[ i ];
 113                 if ( ! stream ) continue;
 114                 AVCodecContext *codec_context = stream->codec;
 115                 if ( ! codec_context ) continue;
 116                 AVCodec *codec = avcodec_find_decoder( codec_context->codec_id );
 117                 if ( ! codec ) continue;
 118
 119                 snprintf( key, sizeof(key), "meta.media.%d.stream.type", i );
 120
 121                 // Determine the type and obtain the first index of each type
 122                 switch( codec_context->codec_type )
 123                 {
 124                         case CODEC_TYPE_VIDEO:
 125                                 if ( *video_index < 0 )
 126                                         *video_index = i;
 127                                 mlt_properties_set( meta_media, key, "video" );
 128                                 snprintf( key, sizeof(key), "meta.media.%d.stream.frame_rate", i );
 129                                 mlt_properties_set_double( meta_media, key, av_q2d( context->streams[ i ]->r_frame_rate ) );
 130                                 snprintf( key, sizeof(key), "meta.media.%d.stream.sample_aspect_ratio", i );
 131                                 mlt_properties_set_double( meta_media, key, av_q2d( context->streams[ i ]->sample_aspect_ratio ) );
 132                                 snprintf( key, sizeof(key), "meta.media.%d.codec.pix_fmt", i );
 133                                 mlt_properties_set( meta_media, key, avcodec_get_pix_fmt_name( codec_context->pix_fmt ) );
 134                                 snprintf( key, sizeof(key), "meta.media.%d.codec.sample_aspect_ratio", i );
 135                                 mlt_properties_set_double( meta_media, key, av_q2d( codec_context->sample_aspect_ratio ) );
 136                                 break;
 137                         case CODEC_TYPE_AUDIO:
 138                                 if ( *audio_index < 0 )
 139                                         *audio_index = i;
 140                                 mlt_properties_set( meta_media, key, "audio" );
 141                                 snprintf( key, sizeof(key), "meta.media.%d.codec.sample_fmt", i );
 142                                 mlt_properties_set( meta_media, key, avcodec_get_sample_fmt_name( codec_context->sample_fmt ) );
 143                                 snprintf( key, sizeof(key), "meta.media.%d.codec.sample_rate", i );
 144                                 mlt_properties_set_int( meta_media, key, codec_context->sample_rate );
 145                                 snprintf( key, sizeof(key), "meta.media.%d.codec.channels", i );
 146                                 mlt_properties_set_int( meta_media, key, codec_context->channels );
 147                                 break;
 148                         default:
 149                                 break;
 150                 }
 151 //              snprintf( key, sizeof(key), "meta.media.%d.stream.time_base", i );
 152 //              mlt_properties_set_double( meta_media, key, av_q2d( context->streams[ i ]->time_base ) );
 153                 snprintf( key, sizeof(key), "meta.media.%d.codec.name", i );
 154                 mlt_properties_set( meta_media, key, codec->name );
 155                 snprintf( key, sizeof(key), "meta.media.%d.codec.long_name", i );
 156                 mlt_properties_set( meta_media, key, codec->long_name );
 157                 snprintf( key, sizeof(key), "meta.media.%d.codec.bit_rate", i );
 158                 mlt_properties_set_int( meta_media, key, codec_context->bit_rate );
 159 //              snprintf( key, sizeof(key), "meta.media.%d.codec.time_base", i );
 160 //              mlt_properties_set_double( meta_media, key, av_q2d( codec_context->time_base ) );
 161                 snprintf( key, sizeof(key), "meta.media.%d.codec.profile", i );
 162                 mlt_properties_set_int( meta_media, key, codec_context->profile );
 163                 snprintf( key, sizeof(key), "meta.media.%d.codec.level", i );
 164                 mlt_properties_set_int( meta_media, key, codec_context->level );
 165         }
 166
 167         return meta_media;
 168 }
 169
 170 /** Producer file destructor.
 171 */
 172
 173 static void producer_file_close( void *context )
 174 {
 175         if ( context != NULL )
 176         {
 177                 // Lock the mutex now
 178                 avformat_lock( );
 179
 180                 // Close the file
 181                 av_close_input_file( context );
 182
 183                 // Unlock the mutex now
 184                 avformat_unlock( );
 185         }
 186 }
 187
 188 /** Producer file destructor.
 189 */
 190
 191 static void producer_codec_close( void *codec )
 192 {
 193         if ( codec != NULL )
 194         {
 195                 // Lock the mutex now
 196                 avformat_lock( );
 197
 198                 // Close the file
 199                 avcodec_close( codec );
 200
 201                 // Unlock the mutex now
 202                 avformat_unlock( );
 203         }
 204 }
 205
 206 static inline int dv_is_pal( AVPacket *pkt )
 207 {
 208         return pkt->data[3] & 0x80;
 209 }
 210
 211 static int dv_is_wide( AVPacket *pkt )
 212 {
 213         int i = 80 /* block size */ *3 /* VAUX starts at block 3 */ +3 /* skip block header */;
 214
 215         for ( ; i < pkt->size; i += 5 /* packet size */ )
 216         {
 217                 if ( pkt->data[ i ] == 0x61 )
 218                 {
 219                         uint8_t x = pkt->data[ i + 2 ] & 0x7;
 220                         return ( x == 2 ) || ( x == 7 );
 221                 }
 222         }
 223         return 0;
 224 }
 225
 226 static double get_aspect_ratio( AVStream *stream, AVCodecContext *codec_context, AVPacket *pkt )
 227 {
 228         double aspect_ratio = 1.0;
 229
 230         if ( codec_context->codec_id == CODEC_ID_DVVIDEO )
 231         {
 232                 if ( pkt )
 233                 {
 234                         if ( dv_is_pal( pkt ) )
 235                         {
 236                                 aspect_ratio = dv_is_wide( pkt )
 237                                         ? 64.0/45.0 // 16:9 PAL
 238                                         : 16.0/15.0; // 4:3 PAL
 239                         }
 240                         else
 241                         {
 242                                 aspect_ratio = dv_is_wide( pkt )
 243                                         ? 32.0/27.0 // 16:9 NTSC
 244                                         : 8.0/9.0; // 4:3 NTSC
 245                         }
 246                 }
 247                 else
 248                 {
 249                         AVRational ar =
 250 #if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(21<<8)+0)
 251                                 stream->sample_aspect_ratio;
 252 #else
 253                                 codec_context->sample_aspect_ratio;
 254 #endif
 255                         // Override FFmpeg's notion of DV aspect ratios, which are
 256                         // based upon a width of 704. Since we do not have a normaliser
 257                         // that crops (nor is cropping 720 wide ITU-R 601 video always desirable)
 258                         // we just coerce the values to facilitate a passive behaviour through
 259                         // the rescale normaliser when using equivalent producers and consumers.
 260                         // = display_aspect / (width * height)
 261                         if ( ar.num == 10 && ar.den == 11 )
 262                                 aspect_ratio = 8.0/9.0; // 4:3 NTSC
 263                         else if ( ar.num == 59 && ar.den == 54 )
 264                                 aspect_ratio = 16.0/15.0; // 4:3 PAL
 265                         else if ( ar.num == 40 && ar.den == 33 )
 266                                 aspect_ratio = 32.0/27.0; // 16:9 NTSC
 267                         else if ( ar.num == 118 && ar.den == 81 )
 268                                 aspect_ratio = 64.0/45.0; // 16:9 PAL
 269                 }
 270         }
 271         else
 272         {
 273                 AVRational codec_sar = codec_context->sample_aspect_ratio;
 274                 AVRational stream_sar =
 275 #if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(21<<8)+0)
 276                         stream->sample_aspect_ratio;
 277 #else
 278                         { 0, 1 };
 279 #endif
 280                 if ( codec_sar.num > 0 )
 281                         aspect_ratio = av_q2d( codec_sar );
 282                 else if ( stream_sar.num > 0 )
 283                         aspect_ratio = av_q2d( stream_sar );
 284         }
 285         return aspect_ratio;
 286 }
 287
 288 /** Open the file.
 289 */
 290
 291 static int producer_open( mlt_producer this, mlt_profile profile, char *file )
 292 {
 293         // Return an error code (0 == no error)
 294         int error = 0;
 295
 296         // Context for avformat
 297         AVFormatContext *context = NULL;
 298
 299         // Get the properties
 300         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 301
 302         // We will treat everything with the producer fps
 303         double fps = mlt_profile_fps( profile );
 304
 305         // Lock the mutex now
 306         avformat_lock( );
 307
 308         // If "MRL", then create AVInputFormat
 309         AVInputFormat *format = NULL;
 310         AVFormatParameters *params = NULL;
 311         char *standard = NULL;
 312         char *mrl = strchr( file, ':' );
 313
 314         // AV option (0 = both, 1 = video, 2 = audio)
 315         int av = 0;
 316
 317         // Setting lowest log level
 318         av_log_set_level( -1 );
 319
 320         // Only if there is not a protocol specification that avformat can handle
 321         if ( mrl && !url_exist( file ) )
 322         {
 323                 // 'file' becomes format abbreviation
 324                 mrl[0] = 0;
 325
 326                 // Lookup the format
 327                 format = av_find_input_format( file );
 328
 329                 // Eat the format designator
 330                 file = ++mrl;
 331
 332                 if ( format )
 333                 {
 334                         // Allocate params
 335                         params = calloc( sizeof( AVFormatParameters ), 1 );
 336
 337                         // These are required by video4linux (defaults)
 338                         params->width = 640;
 339                         params->height = 480;
 340                         params->time_base= (AVRational){1,25};
 341                         // params->device = file;
 342                         params->channels = 2;
 343                         params->sample_rate = 48000;
 344                 }
 345
 346                 // XXX: this does not work anymore since avdevice
 347                 // TODO: make producer_avddevice?
 348                 // Parse out params
 349                 mrl = strchr( file, '?' );
 350                 while ( mrl )
 351                 {
 352                         mrl[0] = 0;
 353                         char *name = strdup( ++mrl );
 354                         char *value = strchr( name, ':' );
 355                         if ( value )
 356                         {
 357                                 value[0] = 0;
 358                                 value++;
 359                                 char *t = strchr( value, '&' );
 360                                 if ( t )
 361                                         t[0] = 0;
 362                                 if ( !strcmp( name, "frame_rate" ) )
 363                                         params->time_base.den = atoi( value );
 364                                 else if ( !strcmp( name, "frame_rate_base" ) )
 365                                         params->time_base.num = atoi( value );
 366                                 else if ( !strcmp( name, "sample_rate" ) )
 367                                         params->sample_rate = atoi( value );
 368                                 else if ( !strcmp( name, "channels" ) )
 369                                         params->channels = atoi( value );
 370                                 else if ( !strcmp( name, "width" ) )
 371                                         params->width = atoi( value );
 372                                 else if ( !strcmp( name, "height" ) )
 373                                         params->height = atoi( value );
 374                                 else if ( !strcmp( name, "standard" ) )
 375                                 {
 376                                         standard = strdup( value );
 377                                         params->standard = standard;
 378                                 }
 379                                 else if ( !strcmp( name, "av" ) )
 380                                         av = atoi( value );
 381                         }
 382                         free( name );
 383                         mrl = strchr( mrl, '&' );
 384                 }
 385         }
 386
 387         // Now attempt to open the file
 388         error = av_open_input_file( &context, file, format, 0, params ) < 0;
 389
 390         // Cleanup AVFormatParameters
 391         free( standard );
 392         free( params );
 393
 394         // If successful, then try to get additional info
 395         if ( error == 0 )
 396         {
 397                 // Get the stream info
 398                 error = av_find_stream_info( context ) < 0;
 399
 400                 // Continue if no error
 401                 if ( error == 0 )
 402                 {
 403                         // We will default to the first audio and video streams found
 404                         int audio_index = -1;
 405                         int video_index = -1;
 406                         int av_bypass = 0;
 407
 408                         // Now set properties where we can (use default unknowns if required)
 409                         if ( context->duration != AV_NOPTS_VALUE )
 410                         {
 411                                 // This isn't going to be accurate for all formats
 412                                 mlt_position frames = ( mlt_position )( ( ( double )context->duration / ( double )AV_TIME_BASE ) * fps + 0.5 );
 413                                 mlt_properties_set_position( properties, "out", frames - 1 );
 414                                 mlt_properties_set_position( properties, "length", frames );
 415                         }
 416
 417                         // Find default audio and video streams
 418                         find_default_streams( properties, context, &audio_index, &video_index );
 419
 420                         if ( context->start_time != AV_NOPTS_VALUE )
 421                                 mlt_properties_set_double( properties, "_start_time", context->start_time );
 422
 423                         // Check if we're seekable (something funny about mpeg here :-/)
 424                         if ( strcmp( file, "pipe:" ) && strncmp( file, "http://", 6 )  && strncmp( file, "udp:", 4 )  && strncmp( file, "tcp:", 4 ) && strncmp( file, "rtsp:", 5 )  && strncmp( file, "rtp:", 4 ) )
 425                         {
 426                                 mlt_properties_set_int( properties, "seekable", av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ), AVSEEK_FLAG_BACKWARD ) >= 0 );
 427                                 mlt_properties_set_data( properties, "dummy_context", context, 0, producer_file_close, NULL );
 428                                 av_open_input_file( &context, file, NULL, 0, NULL );
 429                                 av_find_stream_info( context );
 430                         }
 431                         else
 432                                 av_bypass = 1;
 433
 434                         // Store selected audio and video indexes on properties
 435                         mlt_properties_set_int( properties, "_audio_index", audio_index );
 436                         mlt_properties_set_int( properties, "_video_index", video_index );
 437                         mlt_properties_set_int( properties, "_last_position", -1 );
 438
 439                         // Fetch the width, height and aspect ratio
 440                         if ( video_index != -1 )
 441                         {
 442                                 AVCodecContext *codec_context = context->streams[ video_index ]->codec;
 443                                 mlt_properties_set_int( properties, "width", codec_context->width );
 444                                 mlt_properties_set_int( properties, "height", codec_context->height );
 445
 446                                 if ( codec_context->codec_id == CODEC_ID_DVVIDEO )
 447                                 {
 448                                         // Fetch the first frame of DV so we can read it directly
 449                                         AVPacket pkt;
 450                                         int ret = 0;
 451                                         while ( ret >= 0 )
 452                                         {
 453                                                 ret = av_read_frame( context, &pkt );
 454                                                 if ( ret >= 0 && pkt.stream_index == video_index && pkt.size > 0 )
 455                                                 {
 456                                                         mlt_properties_set_double( properties, "aspect_ratio",
 457                                                                 get_aspect_ratio( context->streams[ video_index ], codec_context, &pkt ) );
 458                                                         break;
 459                                                 }
 460                                         }
 461                                 }
 462                                 else
 463                                 {
 464                                         mlt_properties_set_double( properties, "aspect_ratio",
 465                                                 get_aspect_ratio( context->streams[ video_index ], codec_context, NULL ) );
 466                                 }
 467                         }
 468
 469                         // Read Metadata
 470                         if (context->title != NULL)
 471                                 mlt_properties_set(properties, "meta.attr.title.markup", context->title );
 472                         if (context->author != NULL)
 473                                 mlt_properties_set(properties, "meta.attr.author.markup", context->author );
 474                         if (context->copyright != NULL)
 475                                 mlt_properties_set(properties, "meta.attr.copyright.markup", context->copyright );
 476                         if (context->comment != NULL)
 477                                 mlt_properties_set(properties, "meta.attr.comment.markup", context->comment );
 478                         if (context->album != NULL)
 479                                 mlt_properties_set(properties, "meta.attr.album.markup", context->album );
 480                         if (context->year != 0)
 481                                 mlt_properties_set_int(properties, "meta.attr.year.markup", context->year );
 482                         if (context->track != 0)
 483                                 mlt_properties_set_int(properties, "meta.attr.track.markup", context->track );
 484
 485                         // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
 486                         if ( av == 0 && audio_index != -1 && video_index != -1 )
 487                         {
 488                                 // We'll use the open one as our video_context
 489                                 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
 490
 491                                 // And open again for our audio context
 492                                 av_open_input_file( &context, file, NULL, 0, NULL );
 493                                 av_find_stream_info( context );
 494
 495                                 // Audio context
 496                                 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
 497                         }
 498                         else if ( av != 2 && video_index != -1 )
 499                         {
 500                                 // We only have a video context
 501                                 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
 502                         }
 503                         else if ( audio_index != -1 )
 504                         {
 505                                 // We only have an audio context
 506                                 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
 507                         }
 508                         else
 509                         {
 510                                 // Something has gone wrong
 511                                 error = -1;
 512                         }
 513
 514                         mlt_properties_set_int( properties, "av_bypass", av_bypass );
 515                 }
 516         }
 517
 518         // Unlock the mutex now
 519         avformat_unlock( );
 520
 521         return error;
 522 }
 523
 524 /** Convert a frame position to a time code.
 525 */
 526
 527 static double producer_time_of_frame( mlt_producer this, mlt_position position )
 528 {
 529         return ( double )position / mlt_producer_get_fps( this );
 530 }
 531
 532 static inline void convert_image( AVFrame *frame, uint8_t *buffer, int pix_fmt, mlt_image_format format, int width, int height )
 533 {
 534 #ifdef SWSCALE
 535         if ( format == mlt_image_yuv420p )
 536         {
 537                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 538                         width, height, PIX_FMT_YUV420P, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 539                 AVPicture output;
 540                 output.data[0] = buffer;
 541                 output.data[1] = buffer + width * height;
 542                 output.data[2] = buffer + ( 3 * width * height ) / 2;
 543                 output.linesize[0] = width;
 544                 output.linesize[1] = width >> 1;
 545                 output.linesize[2] = width >> 1;
 546                 sws_scale( context, frame->data, frame->linesize, 0, height,
 547                         output.data, output.linesize);
 548                 sws_freeContext( context );
 549         }
 550         else if ( format == mlt_image_rgb24 )
 551         {
 552                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 553                         width, height, PIX_FMT_RGB24, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 554                 AVPicture output;
 555                 avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
 556                 sws_scale( context, frame->data, frame->linesize, 0, height,
 557                         output.data, output.linesize);
 558                 sws_freeContext( context );
 559         }
 560         else
 561         {
 562                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 563                         width, height, PIX_FMT_YUYV422, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 564                 AVPicture output;
 565                 avpicture_fill( &output, buffer, PIX_FMT_YUYV422, width, height );
 566                 sws_scale( context, frame->data, frame->linesize, 0, height,
 567                         output.data, output.linesize);
 568                 sws_freeContext( context );
 569         }
 570 #else
 571         if ( format == mlt_image_yuv420p )
 572         {
 573                 AVPicture pict;
 574                 pict.data[0] = buffer;
 575                 pict.data[1] = buffer + width * height;
 576                 pict.data[2] = buffer + ( 3 * width * height ) / 2;
 577                 pict.linesize[0] = width;
 578                 pict.linesize[1] = width >> 1;
 579                 pict.linesize[2] = width >> 1;
 580                 img_convert( &pict, PIX_FMT_YUV420P, (AVPicture *)frame, pix_fmt, width, height );
 581         }
 582         else if ( format == mlt_image_rgb24 )
 583         {
 584                 AVPicture output;
 585                 avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
 586                 img_convert( &output, PIX_FMT_RGB24, (AVPicture *)frame, pix_fmt, width, height );
 587         }
 588         else
 589         {
 590                 AVPicture output;
 591                 avpicture_fill( &output, buffer, PIX_FMT_YUV422, width, height );
 592                 img_convert( &output, PIX_FMT_YUV422, (AVPicture *)frame, pix_fmt, width, height );
 593         }
 594 #endif
 595 }
 596
 597 /** Allocate the image buffer and set it on the frame.
 598 */
 599
 600 static int allocate_buffer( mlt_properties frame_properties, AVCodecContext *codec_context, uint8_t **buffer, mlt_image_format *format, int *width, int *height )
 601 {
 602         int size = 0;
 603
 604         if ( codec_context->width == 0 || codec_context->height == 0 )
 605                 return size;
 606
 607         *width = codec_context->width;
 608         *height = codec_context->height;
 609         mlt_properties_set_int( frame_properties, "width", *width );
 610         mlt_properties_set_int( frame_properties, "height", *height );
 611
 612         switch ( *format )
 613         {
 614                 case mlt_image_yuv420p:
 615                         size = *width * 3 * ( *height + 1 ) / 2;
 616                         break;
 617                 case mlt_image_rgb24:
 618                         size = *width * ( *height + 1 ) * 3;
 619                         break;
 620                 default:
 621                         *format = mlt_image_yuv422;
 622                         size = *width * ( *height + 1 ) * 2;
 623                         break;
 624         }
 625
 626         // Construct the output image
 627         *buffer = mlt_pool_alloc( size );
 628         if ( *buffer )
 629                 mlt_properties_set_data( frame_properties, "image", *buffer, size, (mlt_destructor)mlt_pool_release, NULL );
 630         else
 631                 size = 0;
 632
 633         return size;
 634 }
 635
 636 /** Get an image from a frame.
 637 */
 638
 639 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 640 {
 641         // Get the properties from the frame
 642         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 643
 644         // Obtain the frame number of this frame
 645         mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
 646
 647         // Get the producer
 648         mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
 649
 650         // Get the producer properties
 651         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 652
 653         // Fetch the video_context
 654         AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
 655
 656         // Get the video_index
 657         int index = mlt_properties_get_int( properties, "video_index" );
 658
 659         // Obtain the expected frame numer
 660         mlt_position expected = mlt_properties_get_position( properties, "_video_expected" );
 661
 662         // Get the video stream
 663         AVStream *stream = context->streams[ index ];
 664
 665         // Get codec context
 666         AVCodecContext *codec_context = stream->codec;
 667
 668         // Packet
 669         AVPacket pkt;
 670
 671         // Get the conversion frame
 672         AVFrame *av_frame = mlt_properties_get_data( properties, "av_frame", NULL );
 673
 674         // Special case pause handling flag
 675         int paused = 0;
 676
 677         // Special case ffwd handling
 678         int ignore = 0;
 679
 680         // We may want to use the source fps if available
 681         double source_fps = mlt_properties_get_double( properties, "source_fps" );
 682         double fps = mlt_producer_get_fps( this );
 683
 684         // This is the physical frame position in the source
 685         int req_position = ( int )( position / fps * source_fps + 0.5 );
 686
 687         // Get the seekable status
 688         int seekable = mlt_properties_get_int( properties, "seekable" );
 689
 690         // Hopefully provide better support for streams...
 691         int av_bypass = mlt_properties_get_int( properties, "av_bypass" );
 692
 693         // Determines if we have to decode all frames in a sequence
 694         int must_decode = 1;
 695
 696         // Temporary hack to improve intra frame only
 697         must_decode = strcmp( codec_context->codec->name, "mjpeg" ) &&
 698                                   strcmp( codec_context->codec->name, "rawvideo" ) &&
 699                                   strcmp( codec_context->codec->name, "dvvideo" );
 700
 701         // Seek if necessary
 702         if ( position != expected )
 703         {
 704                 if ( av_frame != NULL && position + 1 == expected )
 705                 {
 706                         // We're paused - use last image
 707                         paused = 1;
 708                 }
 709                 else if ( !seekable && position > expected && ( position - expected ) < 250 )
 710                 {
 711                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
 712                         ignore = ( int )( ( position - expected ) / fps * source_fps );
 713                 }
 714                 else if ( seekable && ( position < expected || position - expected >= 12 ) )
 715                 {
 716                         // Calculate the timestamp for the requested frame
 717                         int64_t timestamp = ( int64_t )( ( double )req_position / source_fps * AV_TIME_BASE + 0.5 );
 718                         if ( ( uint64_t )context->start_time != AV_NOPTS_VALUE )
 719                                 timestamp += context->start_time;
 720                         if ( must_decode )
 721                                 timestamp -= AV_TIME_BASE;
 722                         if ( timestamp < 0 )
 723                                 timestamp = 0;
 724
 725                         // Set to the timestamp
 726                         av_seek_frame( context, -1, timestamp, AVSEEK_FLAG_BACKWARD );
 727
 728                         // Remove the cached info relating to the previous position
 729                         mlt_properties_set_int( properties, "_current_position", -1 );
 730                         mlt_properties_set_int( properties, "_last_position", -1 );
 731                         mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
 732                         av_frame = NULL;
 733                 }
 734         }
 735
 736         // Duplicate the last image if necessary (see comment on rawvideo below)
 737         int current_position = mlt_properties_get_int( properties, "_current_position" );
 738         int got_picture = mlt_properties_get_int( properties, "_got_picture" );
 739         if ( av_frame != NULL && got_picture && ( paused || current_position >= req_position ) && av_bypass == 0 )
 740         {
 741                 // Duplicate it
 742                 if ( allocate_buffer( frame_properties, codec_context, buffer, format, width, height ) )
 743                         convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
 744                 else
 745                         mlt_frame_get_image( frame, buffer, format, width, height, writable );
 746         }
 747         else
 748         {
 749                 int ret = 0;
 750                 int int_position = 0;
 751                 got_picture = 0;
 752
 753                 av_init_packet( &pkt );
 754
 755                 // Construct an AVFrame for YUV422 conversion
 756                 if ( av_frame == NULL )
 757                         av_frame = avcodec_alloc_frame( );
 758
 759                 while( ret >= 0 && !got_picture )
 760                 {
 761                         // Read a packet
 762                         ret = av_read_frame( context, &pkt );
 763
 764                         // We only deal with video from the selected video_index
 765                         if ( ret >= 0 && pkt.stream_index == index && pkt.size > 0 )
 766                         {
 767                                 // Determine time code of the packet
 768                                 int_position = ( int )( av_q2d( stream->time_base ) * pkt.dts * source_fps + 0.5 );
 769                                 if ( context->start_time != AV_NOPTS_VALUE )
 770                                         int_position -= ( int )( context->start_time * source_fps / AV_TIME_BASE + 0.5 );
 771                                 int last_position = mlt_properties_get_int( properties, "_last_position" );
 772                                 if ( int_position == last_position )
 773                                         int_position = last_position + 1;
 774                                 mlt_properties_set_int( properties, "_last_position", int_position );
 775
 776                                 // Decode the image
 777                                 if ( must_decode || int_position >= req_position )
 778                                         ret = avcodec_decode_video( codec_context, av_frame, &got_picture, pkt.data, pkt.size );
 779
 780                                 if ( got_picture )
 781                                 {
 782                                         // Handle ignore
 783                                         if ( int_position < req_position )
 784                                         {
 785                                                 ignore = 0;
 786                                                 got_picture = 0;
 787                                         }
 788                                         else if ( int_position >= req_position )
 789                                         {
 790                                                 ignore = 0;
 791                                         }
 792                                         else if ( ignore -- )
 793                                         {
 794                                                 got_picture = 0;
 795                                         }
 796                                 }
 797                                 av_free_packet( &pkt );
 798                         }
 799                         else if ( ret >= 0 )
 800                         {
 801                                 av_free_packet( &pkt );
 802                         }
 803
 804                         // Now handle the picture if we have one
 805                         if ( got_picture )
 806                         {
 807                                 if ( allocate_buffer( frame_properties, codec_context, buffer, format, width, height ) )
 808                                 {
 809                                         convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
 810                                         mlt_properties_set_int( frame_properties, "progressive", !av_frame->interlaced_frame );
 811                                         mlt_properties_set_int( properties, "top_field_first", av_frame->top_field_first );
 812                                         mlt_properties_set_int( properties, "_current_position", int_position );
 813                                         mlt_properties_set_int( properties, "_got_picture", 1 );
 814                                         mlt_properties_set_data( properties, "av_frame", av_frame, 0, av_free, NULL );
 815                                 }
 816                                 else
 817                                 {
 818                                         got_picture = 0;
 819                                 }
 820                         }
 821                 }
 822                 if ( !got_picture )
 823                         mlt_frame_get_image( frame, buffer, format, width, height, writable );
 824         }
 825
 826         // Very untidy - for rawvideo, the packet contains the frame, hence the free packet
 827         // above will break the pause behaviour - so we wipe the frame now
 828         if ( !strcmp( codec_context->codec->name, "rawvideo" ) )
 829                 mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
 830
 831         // Set the field order property for this frame
 832         mlt_properties_set_int( frame_properties, "top_field_first", mlt_properties_get_int( properties, "top_field_first" ) );
 833
 834         // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
 835         mlt_properties_set_position( properties, "_video_expected", position + 1 );
 836
 837         return 0;
 838 }
 839
 840 /** Process properties as AVOptions and apply to AV context obj
 841 */
 842
 843 static void apply_properties( void *obj, mlt_properties properties, int flags )
 844 {
 845         int i;
 846         int count = mlt_properties_count( properties );
 847         for ( i = 0; i < count; i++ )
 848         {
 849                 const char *opt_name = mlt_properties_get_name( properties, i );
 850                 const AVOption *opt = av_find_opt( obj, opt_name, NULL, flags, flags );
 851                 if ( opt != NULL )
 852 #if LIBAVCODEC_VERSION_INT >= ((52<<16)+(7<<8)+0)
 853                         av_set_string3( obj, opt_name, mlt_properties_get( properties, opt_name), 0, NULL );
 854 #elif LIBAVCODEC_VERSION_INT >= ((51<<16)+(59<<8)+0)
 855                         av_set_string2( obj, opt_name, mlt_properties_get( properties, opt_name), 0 );
 856 #else
 857                         av_set_string( obj, opt_name, mlt_properties_get( properties, opt_name) );
 858 #endif
 859         }
 860 }
 861
 862 /** Set up video handling.
 863 */
 864
 865 static void producer_set_up_video( mlt_producer this, mlt_frame frame )
 866 {
 867         // Get the properties
 868         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 869
 870         // Fetch the video_context
 871         AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
 872
 873         // Get the video_index
 874         int index = mlt_properties_get_int( properties, "video_index" );
 875
 876         // Reopen the file if necessary
 877         if ( !context && index > -1 )
 878         {
 879                 mlt_events_block( properties, this );
 880                 producer_open( this, mlt_service_profile( MLT_PRODUCER_SERVICE(this) ),
 881                         mlt_properties_get( properties, "resource" ) );
 882                 context = mlt_properties_get_data( properties, "video_context", NULL );
 883                 mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
 884                 mlt_events_unblock( properties, this );
 885
 886                 // Process properties as AVOptions
 887                 apply_properties( context, properties, AV_OPT_FLAG_DECODING_PARAM );
 888         }
 889
 890         // Exception handling for video_index
 891         if ( context && index >= (int) context->nb_streams )
 892         {
 893                 // Get the last video stream
 894                 for ( index = context->nb_streams - 1; index >= 0 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_VIDEO; --index );
 895                 mlt_properties_set_int( properties, "video_index", index );
 896         }
 897         if ( context && index > -1 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_VIDEO )
 898         {
 899                 // Invalidate the video stream
 900                 index = -1;
 901                 mlt_properties_set_int( properties, "video_index", index );
 902         }
 903
 904         // Get the frame properties
 905         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 906
 907         if ( context && index > -1 )
 908         {
 909                 // Get the video stream
 910                 AVStream *stream = context->streams[ index ];
 911
 912                 // Get codec context
 913                 AVCodecContext *codec_context = stream->codec;
 914
 915                 // Get the codec
 916                 AVCodec *codec = mlt_properties_get_data( properties, "video_codec", NULL );
 917
 918                 // Update the video properties if the index changed
 919                 if ( index != mlt_properties_get_int( properties, "_video_index" ) )
 920                 {
 921                         // Reset the video properties if the index changed
 922                         mlt_properties_set_int( properties, "_video_index", index );
 923                         mlt_properties_set_data( properties, "video_codec", NULL, 0, NULL, NULL );
 924                         mlt_properties_set_int( properties, "width", codec_context->width );
 925                         mlt_properties_set_int( properties, "height", codec_context->height );
 926                         // TODO: get the first usable AVPacket and reset the stream position
 927                         mlt_properties_set_double( properties, "aspect_ratio",
 928                                 get_aspect_ratio( context->streams[ index ], codec_context, NULL ) );
 929                         codec = NULL;
 930                 }
 931
 932                 // Initialise the codec if necessary
 933                 if ( codec == NULL )
 934                 {
 935                         // Initialise multi-threading
 936                         int thread_count = mlt_properties_get_int( properties, "threads" );
 937                         if ( thread_count == 0 && getenv( "MLT_AVFORMAT_THREADS" ) )
 938                                 thread_count = atoi( getenv( "MLT_AVFORMAT_THREADS" ) );
 939                         if ( thread_count > 1 )
 940                         {
 941                                 avcodec_thread_init( codec_context, thread_count );
 942                                 codec_context->thread_count = thread_count;
 943                         }
 944
 945                         // Find the codec
 946                         codec = avcodec_find_decoder( codec_context->codec_id );
 947
 948                         // If we don't have a codec and we can't initialise it, we can't do much more...
 949                         avformat_lock( );
 950                         if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
 951                         {
 952                                 // Now store the codec with its destructor
 953                                 mlt_properties_set_data( properties, "video_codec", codec_context, 0, producer_codec_close, NULL );
 954                         }
 955                         else
 956                         {
 957                                 // Remember that we can't use this later
 958                                 mlt_properties_set_int( properties, "video_index", -1 );
 959                                 index = -1;
 960                         }
 961                         avformat_unlock( );
 962
 963                         // Process properties as AVOptions
 964                         apply_properties( codec_context, properties, AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM );
 965                 }
 966
 967                 // No codec, no show...
 968                 if ( codec && index > -1 )
 969                 {
 970                         double source_fps = 0;
 971                         double force_aspect_ratio = mlt_properties_get_double( properties, "force_aspect_ratio" );
 972                         double aspect_ratio = ( force_aspect_ratio > 0.0 ) ?
 973                                 force_aspect_ratio : mlt_properties_get_double( properties, "aspect_ratio" );
 974
 975                         // Determine the fps
 976                         source_fps = ( double )codec_context->time_base.den / ( codec_context->time_base.num == 0 ? 1 : codec_context->time_base.num );
 977
 978                         // We'll use fps if it's available
 979                         if ( source_fps > 0 )
 980                                 mlt_properties_set_double( properties, "source_fps", source_fps );
 981                         else
 982                                 mlt_properties_set_double( properties, "source_fps", mlt_producer_get_fps( this ) );
 983                         mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
 984
 985                         // Set the width and height
 986                         mlt_properties_set_int( frame_properties, "width", codec_context->width );
 987                         mlt_properties_set_int( frame_properties, "height", codec_context->height );
 988                         mlt_properties_set_int( frame_properties, "real_width", codec_context->width );
 989                         mlt_properties_set_int( frame_properties, "real_height", codec_context->height );
 990                         mlt_properties_set_double( frame_properties, "aspect_ratio", aspect_ratio );
 991
 992                         mlt_frame_push_get_image( frame, producer_get_image );
 993                         mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
 994                 }
 995                 else
 996                 {
 997                         mlt_properties_set_int( frame_properties, "test_image", 1 );
 998                 }
 999         }
1000         else
1001         {
1002                 mlt_properties_set_int( frame_properties, "test_image", 1 );
1003         }
1004 }
1005
1006 /** Get the audio from a frame.
1007 */
1008
1009 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
1010 {
1011         // Get the properties from the frame
1012         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
1013
1014         // Obtain the frame number of this frame
1015         mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
1016
1017         // Get the producer
1018         mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
1019
1020         // Get the producer properties
1021         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
1022
1023         // Fetch the audio_context
1024         AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
1025
1026         // Get the audio_index
1027         int index = mlt_properties_get_int( properties, "audio_index" );
1028
1029         // Get the seekable status
1030         int seekable = mlt_properties_get_int( properties, "seekable" );
1031
1032         // Obtain the expected frame numer
1033         mlt_position expected = mlt_properties_get_position( properties, "_audio_expected" );
1034
1035         // Obtain the resample context if it exists (not always needed)
1036         ReSampleContext *resample = mlt_properties_get_data( properties, "audio_resample", NULL );
1037
1038 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
1039         // Get the format converter context if it exists
1040         AVAudioConvert *convert = mlt_properties_get_data( properties, "audio_convert", NULL );
1041 #endif
1042
1043         // Obtain the audio buffers
1044         int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
1045         int16_t *decode_buffer = mlt_properties_get_data( properties, "decode_buffer", NULL );
1046         int16_t *convert_buffer = mlt_properties_get_data( properties, "convert_buffer", NULL );
1047
1048         // Get amount of audio used
1049         int audio_used =  mlt_properties_get_int( properties, "_audio_used" );
1050
1051         // Calculate the real time code
1052         double real_timecode = producer_time_of_frame( this, position );
1053
1054         // Get the audio stream
1055         AVStream *stream = context->streams[ index ];
1056
1057         // Get codec context
1058         AVCodecContext *codec_context = stream->codec;
1059
1060         // Packet
1061         AVPacket pkt;
1062
1063         // Number of frames to ignore (for ffwd)
1064         int ignore = 0;
1065
1066         // Flag for paused (silence)
1067         int paused = 0;
1068
1069         // Check for resample and create if necessary
1070         if ( resample == NULL && codec_context->channels <= 2 )
1071         {
1072                 // Create the resampler
1073                 resample = audio_resample_init( *channels, codec_context->channels, *frequency, codec_context->sample_rate );
1074
1075                 // And store it on properties
1076                 mlt_properties_set_data( properties, "audio_resample", resample, 0, ( mlt_destructor )audio_resample_close, NULL );
1077         }
1078         else if ( resample == NULL )
1079         {
1080                 *channels = codec_context->channels;
1081                 *frequency = codec_context->sample_rate;
1082         }
1083
1084 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
1085         // Check for audio format converter and create if necessary
1086         // TODO: support higher resolutions than 16-bit.
1087         if ( convert == NULL && codec_context->sample_fmt != SAMPLE_FMT_S16 )
1088         {
1089                 // Create single channel converter for interleaved with no mixing matrix
1090                 convert = av_audio_convert_alloc( SAMPLE_FMT_S16, 1, codec_context->sample_fmt, 1, NULL, 0 );
1091                 mlt_properties_set_data( properties, "audio_convert", convert, 0, ( mlt_destructor )av_audio_convert_free, NULL );
1092         }
1093 #endif
1094
1095         // Check for audio buffer and create if necessary
1096         if ( audio_buffer == NULL )
1097         {
1098                 // Allocate the audio buffer
1099                 audio_buffer = mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
1100
1101                 // And store it on properties for reuse
1102                 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
1103         }
1104
1105         // Check for decoder buffer and create if necessary
1106         if ( decode_buffer == NULL )
1107         {
1108                 // Allocate the audio buffer
1109                 decode_buffer = av_malloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
1110
1111                 // And store it on properties for reuse
1112                 mlt_properties_set_data( properties, "decode_buffer", decode_buffer, 0, ( mlt_destructor )av_free, NULL );
1113         }
1114
1115 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
1116         // Check for format converter buffer and create if necessary
1117         if ( resample && convert && convert_buffer == NULL )
1118         {
1119                 // Allocate the audio buffer
1120                 convert_buffer = mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
1121
1122                 // And store it on properties for reuse
1123                 mlt_properties_set_data( properties, "convert_buffer", convert_buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
1124         }
1125 #endif
1126
1127         // Seek if necessary
1128         if ( position != expected )
1129         {
1130                 if ( position + 1 == expected )
1131                 {
1132                         // We're paused - silence required
1133                         paused = 1;
1134                 }
1135                 else if ( !seekable && position > expected && ( position - expected ) < 250 )
1136                 {
1137                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
1138                         ignore = position - expected;
1139                 }
1140                 else if ( position < expected || position - expected >= 12 )
1141                 {
1142                         // Set to the real timecode
1143                         if ( av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ) + real_timecode * 1000000.0, AVSEEK_FLAG_BACKWARD ) != 0 )
1144                                 paused = 1;
1145
1146                         // Clear the usage in the audio buffer
1147                         audio_used = 0;
1148                 }
1149         }
1150
1151         // Get the audio if required
1152         if ( !paused )
1153         {
1154                 int ret = 0;
1155                 int got_audio = 0;
1156
1157                 av_init_packet( &pkt );
1158
1159                 while( ret >= 0 && !got_audio )
1160                 {
1161                         // Check if the buffer already contains the samples required
1162                         if ( audio_used >= *samples && ignore == 0 )
1163                         {
1164                                 got_audio = 1;
1165                                 break;
1166                         }
1167
1168                         // Read a packet
1169                         ret = av_read_frame( context, &pkt );
1170
1171                         int len = pkt.size;
1172                         uint8_t *ptr = pkt.data;
1173
1174                         // We only deal with audio from the selected audio_index
1175                         while ( ptr != NULL && ret >= 0 && pkt.stream_index == index && len > 0 )
1176                         {
1177                                 int data_size = sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE;
1178
1179                                 // Decode the audio
1180 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(29<<8)+0))
1181                                 ret = avcodec_decode_audio2( codec_context, decode_buffer, &data_size, ptr, len );
1182 #else
1183                                 ret = avcodec_decode_audio( codec_context, decode_buffer, &data_size, ptr, len );
1184 #endif
1185                                 if ( ret < 0 )
1186                                 {
1187                                         ret = 0;
1188                                         break;
1189                                 }
1190
1191                                 len -= ret;
1192                                 ptr += ret;
1193
1194                                 if ( data_size > 0 )
1195                                 {
1196                                         int src_stride[6]= { av_get_bits_per_sample_format( codec_context->sample_fmt ) / 8 };
1197                                         int dst_stride[6]= { av_get_bits_per_sample_format( SAMPLE_FMT_S16 ) / 8 };
1198
1199                                         if ( resample )
1200                                         {
1201                                                 int16_t *source = decode_buffer;
1202                                                 int16_t *dest = &audio_buffer[ audio_used * *channels ];
1203                                                 int convert_samples = data_size / src_stride[0];
1204
1205 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
1206                                                 if ( convert )
1207                                                 {
1208                                                         const void *src_buf[6] = { decode_buffer };
1209                                                         void *dst_buf[6] = { convert_buffer };
1210                                                         av_audio_convert( convert, dst_buf, dst_stride, src_buf, src_stride, convert_samples );
1211                                                         source = convert_buffer;
1212                                                 }
1213 #endif
1214                                                 audio_used += audio_resample( resample, dest, source, convert_samples / codec_context->channels );
1215                                         }
1216                                         else
1217                                         {
1218 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
1219                                                 if ( convert )
1220                                                 {
1221                                                         const void *src_buf[6] = { decode_buffer };
1222                                                         void *dst_buf[6] = { &audio_buffer[ audio_used * *channels ] };
1223                                                         av_audio_convert( convert, dst_buf, dst_stride, src_buf, src_stride, data_size / src_stride[0] );
1224                                                 }
1225                                                 else
1226 #endif
1227                                                 {
1228                                                         memcpy( &audio_buffer[ audio_used * *channels ], decode_buffer, data_size );
1229                                                 }
1230                                                 audio_used += data_size / *channels / src_stride[0];
1231                                         }
1232
1233                                         // Handle ignore
1234                                         while ( ignore && audio_used > *samples )
1235                                         {
1236                                                 ignore --;
1237                                                 audio_used -= *samples;
1238                                                 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
1239                                         }
1240                                 }
1241
1242                                 // If we're behind, ignore this packet
1243                                 if ( pkt.pts >= 0 )
1244                                 {
1245                                         float current_pts = av_q2d( stream->time_base ) * pkt.pts;
1246                                         if ( seekable && ( !ignore && current_pts <= ( real_timecode - 0.02 ) ) )
1247                                                 ignore = 1;
1248                                 }
1249                         }
1250
1251                         // We're finished with this packet regardless
1252                         av_free_packet( &pkt );
1253                 }
1254
1255                 *buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
1256                 mlt_properties_set_data( frame_properties, "audio", *buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
1257
1258                 // Now handle the audio if we have enough
1259                 if ( audio_used >= *samples )
1260                 {
1261                         memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
1262                         audio_used -= *samples;
1263                         memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
1264                 }
1265                 else
1266                 {
1267                         memset( *buffer, 0, *samples * *channels * sizeof( int16_t ) );
1268                 }
1269
1270                 // Store the number of audio samples still available
1271                 mlt_properties_set_int( properties, "_audio_used", audio_used );
1272         }
1273         else
1274         {
1275                 // Get silence and don't touch the context
1276                 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
1277         }
1278
1279         // Regardless of speed (other than paused), we expect to get the next frame
1280         if ( !paused )
1281                 mlt_properties_set_position( properties, "_audio_expected", position + 1 );
1282
1283         return 0;
1284 }
1285
1286 /** Set up audio handling.
1287 */
1288
1289 static void producer_set_up_audio( mlt_producer this, mlt_frame frame )
1290 {
1291         // Get the properties
1292         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
1293
1294         // Fetch the audio_context
1295         AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
1296
1297         // Get the audio_index
1298         int index = mlt_properties_get_int( properties, "audio_index" );
1299
1300         // Reopen the file if necessary
1301         if ( !context && index > -1 )
1302         {
1303                 mlt_events_block( properties, this );
1304                 producer_open( this, mlt_service_profile( MLT_PRODUCER_SERVICE(this) ),
1305                         mlt_properties_get( properties, "resource" ) );
1306                 context = mlt_properties_get_data( properties, "audio_context", NULL );
1307                 mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
1308                 mlt_events_unblock( properties, this );
1309         }
1310
1311         // Exception handling for audio_index
1312         if ( context && index >= (int) context->nb_streams )
1313         {
1314                 for ( index = context->nb_streams - 1; index >= 0 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_AUDIO; --index );
1315                 mlt_properties_set_int( properties, "audio_index", index );
1316         }
1317         if ( context && index > -1 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_AUDIO )
1318         {
1319                 index = -1;
1320                 mlt_properties_set_int( properties, "audio_index", index );
1321         }
1322
1323         // Update the audio properties if the index changed
1324         if ( index > -1 && index != mlt_properties_get_int( properties, "_audio_index" ) )
1325         {
1326                 mlt_properties_set_int( properties, "_audio_index", index );
1327                 mlt_properties_set_data( properties, "audio_codec", NULL, 0, NULL, NULL );
1328         }
1329
1330         // Deal with audio context
1331         if ( context != NULL && index > -1 )
1332         {
1333                 // Get the frame properties
1334                 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
1335
1336                 // Get the audio stream
1337                 AVStream *stream = context->streams[ index ];
1338
1339                 // Get codec context
1340                 AVCodecContext *codec_context = stream->codec;
1341
1342                 // Get the codec
1343                 AVCodec *codec = mlt_properties_get_data( properties, "audio_codec", NULL );
1344
1345                 // Initialise the codec if necessary
1346                 if ( codec == NULL )
1347                 {
1348                         // Find the codec
1349                         codec = avcodec_find_decoder( codec_context->codec_id );
1350
1351                         // If we don't have a codec and we can't initialise it, we can't do much more...
1352                         avformat_lock( );
1353                         if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
1354                         {
1355                                 // Now store the codec with its destructor
1356                                 mlt_properties_set_data( properties, "audio_codec", codec_context, 0, producer_codec_close, NULL );
1357
1358                         }
1359                         else
1360                         {
1361                                 // Remember that we can't use this later
1362                                 mlt_properties_set_int( properties, "audio_index", -1 );
1363                                 index = -1;
1364                         }
1365                         avformat_unlock( );
1366
1367                         // Process properties as AVOptions
1368                         apply_properties( codec_context, properties, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM );
1369                 }
1370
1371                 // No codec, no show...
1372                 if ( codec && index > -1 )
1373                 {
1374                         mlt_frame_push_audio( frame, producer_get_audio );
1375                         mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
1376                         mlt_properties_set_int( frame_properties, "frequency", codec_context->sample_rate );
1377                         mlt_properties_set_int( frame_properties, "channels", codec_context->channels );
1378                 }
1379         }
1380 }
1381
1382 /** Our get frame implementation.
1383 */
1384
1385 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
1386 {
1387         // Create an empty frame
1388         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
1389
1390         // Update timecode on the frame we're creating
1391         mlt_frame_set_position( *frame, mlt_producer_position( this ) );
1392
1393         // Set the position of this producer
1394         mlt_properties_set_position( MLT_FRAME_PROPERTIES( *frame ), "avformat_position", mlt_producer_frame( this ) );
1395
1396         // Set up the video
1397         producer_set_up_video( this, *frame );
1398
1399         // Set up the audio
1400         producer_set_up_audio( this, *frame );
1401
1402         // Set the aspect_ratio
1403         mlt_properties_set_double( MLT_FRAME_PROPERTIES( *frame ), "aspect_ratio", mlt_properties_get_double( MLT_PRODUCER_PROPERTIES( this ), "aspect_ratio" ) );
1404
1405         // Calculate the next timecode
1406         mlt_producer_prepare_next( this );
1407
1408         return 0;
1409 }