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 #include <framework/mlt_log.h>
  27
  28 // ffmpeg Header files
  29 #include <avformat.h>
  30 #include <opt.h>
  31 #ifdef SWSCALE
  32 #  include <swscale.h>
  33 #endif
  34 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
  35 #  include "audioconvert.h"
  36 #endif
  37
  38 // System header files
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <pthread.h>
  42
  43 #if LIBAVUTIL_VERSION_INT < (50<<16)
  44 #define PIX_FMT_YUYV422 PIX_FMT_YUV422
  45 #endif
  46
  47 void avformat_lock( );
  48 void avformat_unlock( );
  49
  50 // Forward references.
  51 static int producer_open( mlt_producer this, mlt_profile profile, char *file );
  52 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
  53
  54 /** Constructor for libavformat.
  55 */
  56
  57 mlt_producer producer_avformat_init( mlt_profile profile, char *file )
  58 {
  59         int error = 0;
  60
  61         // Report information about available demuxers and codecs as YAML Tiny
  62         if ( file && strstr( file, "f-list" ) )
  63         {
  64                 fprintf( stderr, "---\nformats:\n" );
  65                 AVInputFormat *format = NULL;
  66                 while ( ( format = av_iformat_next( format ) ) )
  67                         fprintf( stderr, "  - %s\n", format->name );
  68                 fprintf( stderr, "...\n" );
  69                 error = 1;
  70         }
  71         if ( file && strstr( file, "acodec-list" ) )
  72         {
  73                 fprintf( stderr, "---\naudio_codecs:\n" );
  74                 AVCodec *codec = NULL;
  75                 while ( ( codec = av_codec_next( codec ) ) )
  76                         if ( codec->decode && codec->type == CODEC_TYPE_AUDIO )
  77                                 fprintf( stderr, "  - %s\n", codec->name );
  78                 fprintf( stderr, "...\n" );
  79                 error = 1;
  80         }
  81         if ( file && strstr( file, "vcodec-list" ) )
  82         {
  83                 fprintf( stderr, "---\nvideo_codecs:\n" );
  84                 AVCodec *codec = NULL;
  85                 while ( ( codec = av_codec_next( codec ) ) )
  86                         if ( codec->decode && codec->type == CODEC_TYPE_VIDEO )
  87                                 fprintf( stderr, "  - %s\n", codec->name );
  88                 fprintf( stderr, "...\n" );
  89                 error = 1;
  90         }
  91         if ( error )
  92                 return NULL;
  93
  94         mlt_producer this = NULL;
  95
  96         // Check that we have a non-NULL argument
  97         if ( file != NULL )
  98         {
  99                 // Construct the producer
 100                 this = calloc( 1, sizeof( struct mlt_producer_s ) );
 101
 102                 // Initialise it
 103                 if ( mlt_producer_init( this, NULL ) == 0 )
 104                 {
 105                         // Get the properties
 106                         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 107
 108                         // Set the resource property (required for all producers)
 109                         mlt_properties_set( properties, "resource", file );
 110
 111                         // Register our get_frame implementation
 112                         this->get_frame = producer_get_frame;
 113
 114                         // Open the file
 115                         if ( producer_open( this, profile, file ) != 0 )
 116                         {
 117                                 // Clean up
 118                                 mlt_producer_close( this );
 119                                 this = NULL;
 120                         }
 121                         else
 122                         {
 123                                 // Close the file to release resources for large playlists - reopen later as needed
 124                                 mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
 125                                 mlt_properties_set_data( properties, "audio_context", NULL, 0, NULL, NULL );
 126                                 mlt_properties_set_data( properties, "video_context", NULL, 0, NULL, NULL );
 127
 128                                 // Default the user-selectable indices from the auto-detected indices
 129                                 mlt_properties_set_int( properties, "audio_index",  mlt_properties_get_int( properties, "_audio_index" ) );
 130                                 mlt_properties_set_int( properties, "video_index",  mlt_properties_get_int( properties, "_video_index" ) );
 131                         }
 132                 }
 133         }
 134
 135         return this;
 136 }
 137
 138 /** Find the default streams.
 139 */
 140
 141 static mlt_properties find_default_streams( mlt_properties meta_media, AVFormatContext *context, int *audio_index, int *video_index )
 142 {
 143         int i;
 144         char key[200];
 145
 146         mlt_properties_set_int( meta_media, "meta.media.nb_streams", context->nb_streams );
 147
 148         // Allow for multiple audio and video streams in the file and select first of each (if available)
 149         for( i = 0; i < context->nb_streams; i++ )
 150         {
 151                 // Get the codec context
 152                 AVStream *stream = context->streams[ i ];
 153                 if ( ! stream ) continue;
 154                 AVCodecContext *codec_context = stream->codec;
 155                 if ( ! codec_context ) continue;
 156                 AVCodec *codec = avcodec_find_decoder( codec_context->codec_id );
 157                 if ( ! codec ) continue;
 158
 159                 snprintf( key, sizeof(key), "meta.media.%d.stream.type", i );
 160
 161                 // Determine the type and obtain the first index of each type
 162                 switch( codec_context->codec_type )
 163                 {
 164                         case CODEC_TYPE_VIDEO:
 165                                 if ( *video_index < 0 )
 166                                         *video_index = i;
 167                                 mlt_properties_set( meta_media, key, "video" );
 168                                 snprintf( key, sizeof(key), "meta.media.%d.stream.frame_rate", i );
 169                                 mlt_properties_set_double( meta_media, key, av_q2d( context->streams[ i ]->r_frame_rate ) );
 170 #if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(21<<8)+0)
 171                                 snprintf( key, sizeof(key), "meta.media.%d.stream.sample_aspect_ratio", i );
 172                                 mlt_properties_set_double( meta_media, key, av_q2d( context->streams[ i ]->sample_aspect_ratio ) );
 173 #endif
 174                                 snprintf( key, sizeof(key), "meta.media.%d.codec.pix_fmt", i );
 175                                 mlt_properties_set( meta_media, key, avcodec_get_pix_fmt_name( codec_context->pix_fmt ) );
 176                                 snprintf( key, sizeof(key), "meta.media.%d.codec.sample_aspect_ratio", i );
 177                                 mlt_properties_set_double( meta_media, key, av_q2d( codec_context->sample_aspect_ratio ) );
 178                                 break;
 179                         case CODEC_TYPE_AUDIO:
 180                                 if ( *audio_index < 0 )
 181                                         *audio_index = i;
 182                                 mlt_properties_set( meta_media, key, "audio" );
 183 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
 184                                 snprintf( key, sizeof(key), "meta.media.%d.codec.sample_fmt", i );
 185                                 mlt_properties_set( meta_media, key, avcodec_get_sample_fmt_name( codec_context->sample_fmt ) );
 186 #endif
 187                                 snprintf( key, sizeof(key), "meta.media.%d.codec.sample_rate", i );
 188                                 mlt_properties_set_int( meta_media, key, codec_context->sample_rate );
 189                                 snprintf( key, sizeof(key), "meta.media.%d.codec.channels", i );
 190                                 mlt_properties_set_int( meta_media, key, codec_context->channels );
 191                                 break;
 192                         default:
 193                                 break;
 194                 }
 195 //              snprintf( key, sizeof(key), "meta.media.%d.stream.time_base", i );
 196 //              mlt_properties_set_double( meta_media, key, av_q2d( context->streams[ i ]->time_base ) );
 197                 snprintf( key, sizeof(key), "meta.media.%d.codec.name", i );
 198                 mlt_properties_set( meta_media, key, codec->name );
 199 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(55<<8)+0))
 200                 snprintf( key, sizeof(key), "meta.media.%d.codec.long_name", i );
 201                 mlt_properties_set( meta_media, key, codec->long_name );
 202 #endif
 203                 snprintf( key, sizeof(key), "meta.media.%d.codec.bit_rate", i );
 204                 mlt_properties_set_int( meta_media, key, codec_context->bit_rate );
 205 //              snprintf( key, sizeof(key), "meta.media.%d.codec.time_base", i );
 206 //              mlt_properties_set_double( meta_media, key, av_q2d( codec_context->time_base ) );
 207                 snprintf( key, sizeof(key), "meta.media.%d.codec.profile", i );
 208                 mlt_properties_set_int( meta_media, key, codec_context->profile );
 209                 snprintf( key, sizeof(key), "meta.media.%d.codec.level", i );
 210                 mlt_properties_set_int( meta_media, key, codec_context->level );
 211         }
 212
 213         return meta_media;
 214 }
 215
 216 /** Producer file destructor.
 217 */
 218
 219 static void producer_file_close( void *context )
 220 {
 221         if ( context != NULL )
 222         {
 223                 // Lock the mutex now
 224                 avformat_lock( );
 225
 226                 // Close the file
 227                 av_close_input_file( context );
 228
 229                 // Unlock the mutex now
 230                 avformat_unlock( );
 231         }
 232 }
 233
 234 /** Producer file destructor.
 235 */
 236
 237 static void producer_codec_close( void *codec )
 238 {
 239         if ( codec != NULL )
 240         {
 241                 // Lock the mutex now
 242                 avformat_lock( );
 243
 244                 // Close the file
 245                 avcodec_close( codec );
 246
 247                 // Unlock the mutex now
 248                 avformat_unlock( );
 249         }
 250 }
 251
 252 static inline int dv_is_pal( AVPacket *pkt )
 253 {
 254         return pkt->data[3] & 0x80;
 255 }
 256
 257 static int dv_is_wide( AVPacket *pkt )
 258 {
 259         int i = 80 /* block size */ *3 /* VAUX starts at block 3 */ +3 /* skip block header */;
 260
 261         for ( ; i < pkt->size; i += 5 /* packet size */ )
 262         {
 263                 if ( pkt->data[ i ] == 0x61 )
 264                 {
 265                         uint8_t x = pkt->data[ i + 2 ] & 0x7;
 266                         return ( x == 2 ) || ( x == 7 );
 267                 }
 268         }
 269         return 0;
 270 }
 271
 272 static double get_aspect_ratio( AVStream *stream, AVCodecContext *codec_context, AVPacket *pkt )
 273 {
 274         double aspect_ratio = 1.0;
 275
 276         if ( codec_context->codec_id == CODEC_ID_DVVIDEO )
 277         {
 278                 if ( pkt )
 279                 {
 280                         if ( dv_is_pal( pkt ) )
 281                         {
 282                                 aspect_ratio = dv_is_wide( pkt )
 283                                         ? 64.0/45.0 // 16:9 PAL
 284                                         : 16.0/15.0; // 4:3 PAL
 285                         }
 286                         else
 287                         {
 288                                 aspect_ratio = dv_is_wide( pkt )
 289                                         ? 32.0/27.0 // 16:9 NTSC
 290                                         : 8.0/9.0; // 4:3 NTSC
 291                         }
 292                 }
 293                 else
 294                 {
 295                         AVRational ar =
 296 #if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(21<<8)+0)
 297                                 stream->sample_aspect_ratio;
 298 #else
 299                                 codec_context->sample_aspect_ratio;
 300 #endif
 301                         // Override FFmpeg's notion of DV aspect ratios, which are
 302                         // based upon a width of 704. Since we do not have a normaliser
 303                         // that crops (nor is cropping 720 wide ITU-R 601 video always desirable)
 304                         // we just coerce the values to facilitate a passive behaviour through
 305                         // the rescale normaliser when using equivalent producers and consumers.
 306                         // = display_aspect / (width * height)
 307                         if ( ar.num == 10 && ar.den == 11 )
 308                                 aspect_ratio = 8.0/9.0; // 4:3 NTSC
 309                         else if ( ar.num == 59 && ar.den == 54 )
 310                                 aspect_ratio = 16.0/15.0; // 4:3 PAL
 311                         else if ( ar.num == 40 && ar.den == 33 )
 312                                 aspect_ratio = 32.0/27.0; // 16:9 NTSC
 313                         else if ( ar.num == 118 && ar.den == 81 )
 314                                 aspect_ratio = 64.0/45.0; // 16:9 PAL
 315                 }
 316         }
 317         else
 318         {
 319                 AVRational codec_sar = codec_context->sample_aspect_ratio;
 320                 AVRational stream_sar =
 321 #if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(21<<8)+0)
 322                         stream->sample_aspect_ratio;
 323 #else
 324                         { 0, 1 };
 325 #endif
 326                 if ( codec_sar.num > 0 )
 327                         aspect_ratio = av_q2d( codec_sar );
 328                 else if ( stream_sar.num > 0 )
 329                         aspect_ratio = av_q2d( stream_sar );
 330         }
 331         return aspect_ratio;
 332 }
 333
 334 /** Open the file.
 335 */
 336
 337 static int producer_open( mlt_producer this, mlt_profile profile, char *file )
 338 {
 339         // Return an error code (0 == no error)
 340         int error = 0;
 341
 342         // Context for avformat
 343         AVFormatContext *context = NULL;
 344
 345         // Get the properties
 346         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 347
 348         // We will treat everything with the producer fps
 349         double fps = mlt_profile_fps( profile );
 350
 351         // Lock the mutex now
 352         avformat_lock( );
 353
 354         // If "MRL", then create AVInputFormat
 355         AVInputFormat *format = NULL;
 356         AVFormatParameters *params = NULL;
 357         char *standard = NULL;
 358         char *mrl = strchr( file, ':' );
 359
 360         // AV option (0 = both, 1 = video, 2 = audio)
 361         int av = 0;
 362
 363         // Only if there is not a protocol specification that avformat can handle
 364         if ( mrl && !url_exist( file ) )
 365         {
 366                 // 'file' becomes format abbreviation
 367                 mrl[0] = 0;
 368
 369                 // Lookup the format
 370                 format = av_find_input_format( file );
 371
 372                 // Eat the format designator
 373                 file = ++mrl;
 374
 375                 if ( format )
 376                 {
 377                         // Allocate params
 378                         params = calloc( sizeof( AVFormatParameters ), 1 );
 379
 380                         // These are required by video4linux (defaults)
 381                         params->width = 640;
 382                         params->height = 480;
 383                         params->time_base= (AVRational){1,25};
 384                         // params->device = file;
 385                         params->channels = 2;
 386                         params->sample_rate = 48000;
 387                 }
 388
 389                 // XXX: this does not work anymore since avdevice
 390                 // TODO: make producer_avddevice?
 391                 // Parse out params
 392                 mrl = strchr( file, '?' );
 393                 while ( mrl )
 394                 {
 395                         mrl[0] = 0;
 396                         char *name = strdup( ++mrl );
 397                         char *value = strchr( name, ':' );
 398                         if ( value )
 399                         {
 400                                 value[0] = 0;
 401                                 value++;
 402                                 char *t = strchr( value, '&' );
 403                                 if ( t )
 404                                         t[0] = 0;
 405                                 if ( !strcmp( name, "frame_rate" ) )
 406                                         params->time_base.den = atoi( value );
 407                                 else if ( !strcmp( name, "frame_rate_base" ) )
 408                                         params->time_base.num = atoi( value );
 409                                 else if ( !strcmp( name, "sample_rate" ) )
 410                                         params->sample_rate = atoi( value );
 411                                 else if ( !strcmp( name, "channels" ) )
 412                                         params->channels = atoi( value );
 413                                 else if ( !strcmp( name, "width" ) )
 414                                         params->width = atoi( value );
 415                                 else if ( !strcmp( name, "height" ) )
 416                                         params->height = atoi( value );
 417                                 else if ( !strcmp( name, "standard" ) )
 418                                 {
 419                                         standard = strdup( value );
 420                                         params->standard = standard;
 421                                 }
 422                                 else if ( !strcmp( name, "av" ) )
 423                                         av = atoi( value );
 424                         }
 425                         free( name );
 426                         mrl = strchr( mrl, '&' );
 427                 }
 428         }
 429
 430         // Now attempt to open the file
 431         error = av_open_input_file( &context, file, format, 0, params ) < 0;
 432
 433         // Cleanup AVFormatParameters
 434         free( standard );
 435         free( params );
 436
 437         // If successful, then try to get additional info
 438         if ( error == 0 )
 439         {
 440                 // Get the stream info
 441                 error = av_find_stream_info( context ) < 0;
 442
 443                 // Continue if no error
 444                 if ( error == 0 )
 445                 {
 446                         // We will default to the first audio and video streams found
 447                         int audio_index = -1;
 448                         int video_index = -1;
 449                         int av_bypass = 0;
 450
 451                         // Now set properties where we can (use default unknowns if required)
 452                         if ( context->duration != AV_NOPTS_VALUE )
 453                         {
 454                                 // This isn't going to be accurate for all formats
 455                                 mlt_position frames = ( mlt_position )( ( ( double )context->duration / ( double )AV_TIME_BASE ) * fps + 0.5 );
 456                                 mlt_properties_set_position( properties, "out", frames - 1 );
 457                                 mlt_properties_set_position( properties, "length", frames );
 458                         }
 459
 460                         // Find default audio and video streams
 461                         find_default_streams( properties, context, &audio_index, &video_index );
 462
 463                         if ( context->start_time != AV_NOPTS_VALUE )
 464                                 mlt_properties_set_double( properties, "_start_time", context->start_time );
 465
 466                         // Check if we're seekable (something funny about mpeg here :-/)
 467                         if ( strcmp( file, "pipe:" ) && strncmp( file, "http://", 6 )  && strncmp( file, "udp:", 4 )  && strncmp( file, "tcp:", 4 ) && strncmp( file, "rtsp:", 5 )  && strncmp( file, "rtp:", 4 ) )
 468                         {
 469                                 mlt_properties_set_int( properties, "seekable", av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ), AVSEEK_FLAG_BACKWARD ) >= 0 );
 470                                 mlt_properties_set_data( properties, "dummy_context", context, 0, producer_file_close, NULL );
 471                                 av_open_input_file( &context, file, NULL, 0, NULL );
 472                                 av_find_stream_info( context );
 473                         }
 474                         else
 475                                 av_bypass = 1;
 476
 477                         // Store selected audio and video indexes on properties
 478                         mlt_properties_set_int( properties, "_audio_index", audio_index );
 479                         mlt_properties_set_int( properties, "_video_index", video_index );
 480                         mlt_properties_set_int( properties, "_last_position", -1 );
 481
 482                         // Fetch the width, height and aspect ratio
 483                         if ( video_index != -1 )
 484                         {
 485                                 AVCodecContext *codec_context = context->streams[ video_index ]->codec;
 486                                 mlt_properties_set_int( properties, "width", codec_context->width );
 487                                 mlt_properties_set_int( properties, "height", codec_context->height );
 488
 489                                 if ( codec_context->codec_id == CODEC_ID_DVVIDEO )
 490                                 {
 491                                         // Fetch the first frame of DV so we can read it directly
 492                                         AVPacket pkt;
 493                                         int ret = 0;
 494                                         while ( ret >= 0 )
 495                                         {
 496                                                 ret = av_read_frame( context, &pkt );
 497                                                 if ( ret >= 0 && pkt.stream_index == video_index && pkt.size > 0 )
 498                                                 {
 499                                                         mlt_properties_set_double( properties, "aspect_ratio",
 500                                                                 get_aspect_ratio( context->streams[ video_index ], codec_context, &pkt ) );
 501                                                         break;
 502                                                 }
 503                                         }
 504                                 }
 505                                 else
 506                                 {
 507                                         mlt_properties_set_double( properties, "aspect_ratio",
 508                                                 get_aspect_ratio( context->streams[ video_index ], codec_context, NULL ) );
 509                                 }
 510                         }
 511
 512                         // Read Metadata
 513                         if (context->title != NULL)
 514                                 mlt_properties_set(properties, "meta.attr.title.markup", context->title );
 515                         if (context->author != NULL)
 516                                 mlt_properties_set(properties, "meta.attr.author.markup", context->author );
 517                         if (context->copyright != NULL)
 518                                 mlt_properties_set(properties, "meta.attr.copyright.markup", context->copyright );
 519                         if (context->comment != NULL)
 520                                 mlt_properties_set(properties, "meta.attr.comment.markup", context->comment );
 521                         if (context->album != NULL)
 522                                 mlt_properties_set(properties, "meta.attr.album.markup", context->album );
 523                         if (context->year != 0)
 524                                 mlt_properties_set_int(properties, "meta.attr.year.markup", context->year );
 525                         if (context->track != 0)
 526                                 mlt_properties_set_int(properties, "meta.attr.track.markup", context->track );
 527
 528                         // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
 529                         if ( av == 0 && audio_index != -1 && video_index != -1 )
 530                         {
 531                                 // We'll use the open one as our video_context
 532                                 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
 533
 534                                 // And open again for our audio context
 535                                 av_open_input_file( &context, file, NULL, 0, NULL );
 536                                 av_find_stream_info( context );
 537
 538                                 // Audio context
 539                                 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
 540                         }
 541                         else if ( av != 2 && video_index != -1 )
 542                         {
 543                                 // We only have a video context
 544                                 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
 545                         }
 546                         else if ( audio_index != -1 )
 547                         {
 548                                 // We only have an audio context
 549                                 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
 550                         }
 551                         else
 552                         {
 553                                 // Something has gone wrong
 554                                 error = -1;
 555                         }
 556
 557                         mlt_properties_set_int( properties, "av_bypass", av_bypass );
 558                 }
 559         }
 560
 561         // Unlock the mutex now
 562         avformat_unlock( );
 563
 564         return error;
 565 }
 566
 567 /** Convert a frame position to a time code.
 568 */
 569
 570 static double producer_time_of_frame( mlt_producer this, mlt_position position )
 571 {
 572         return ( double )position / mlt_producer_get_fps( this );
 573 }
 574
 575 static inline void convert_image( AVFrame *frame, uint8_t *buffer, int pix_fmt, mlt_image_format *format, int width, int height )
 576 {
 577 #ifdef SWSCALE
 578         if ( pix_fmt == PIX_FMT_RGB32 )
 579         {
 580                 *format = mlt_image_rgb24a;
 581                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 582                         width, height, PIX_FMT_RGBA, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 583                 AVPicture output;
 584                 avpicture_fill( &output, buffer, PIX_FMT_RGBA, width, height );
 585                 sws_scale( context, frame->data, frame->linesize, 0, height,
 586                         output.data, output.linesize);
 587                 sws_freeContext( context );
 588         }
 589         else if ( *format == mlt_image_yuv420p )
 590         {
 591                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 592                         width, height, PIX_FMT_YUV420P, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 593                 AVPicture output;
 594                 output.data[0] = buffer;
 595                 output.data[1] = buffer + width * height;
 596                 output.data[2] = buffer + ( 3 * width * height ) / 2;
 597                 output.linesize[0] = width;
 598                 output.linesize[1] = width >> 1;
 599                 output.linesize[2] = width >> 1;
 600                 sws_scale( context, frame->data, frame->linesize, 0, height,
 601                         output.data, output.linesize);
 602                 sws_freeContext( context );
 603         }
 604         else if ( *format == mlt_image_rgb24 )
 605         {
 606                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 607                         width, height, PIX_FMT_RGB24, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 608                 AVPicture output;
 609                 avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
 610                 sws_scale( context, frame->data, frame->linesize, 0, height,
 611                         output.data, output.linesize);
 612                 sws_freeContext( context );
 613         }
 614         else
 615         {
 616                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 617                         width, height, PIX_FMT_YUYV422, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 618                 AVPicture output;
 619                 avpicture_fill( &output, buffer, PIX_FMT_YUYV422, width, height );
 620                 sws_scale( context, frame->data, frame->linesize, 0, height,
 621                         output.data, output.linesize);
 622                 sws_freeContext( context );
 623         }
 624 #else
 625         if ( *format == mlt_image_yuv420p )
 626         {
 627                 AVPicture pict;
 628                 pict.data[0] = buffer;
 629                 pict.data[1] = buffer + width * height;
 630                 pict.data[2] = buffer + ( 3 * width * height ) / 2;
 631                 pict.linesize[0] = width;
 632                 pict.linesize[1] = width >> 1;
 633                 pict.linesize[2] = width >> 1;
 634                 img_convert( &pict, PIX_FMT_YUV420P, (AVPicture *)frame, pix_fmt, width, height );
 635         }
 636         else if ( *format == mlt_image_rgb24 )
 637         {
 638                 AVPicture output;
 639                 avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
 640                 img_convert( &output, PIX_FMT_RGB24, (AVPicture *)frame, pix_fmt, width, height );
 641         }
 642         else
 643         {
 644                 AVPicture output;
 645                 avpicture_fill( &output, buffer, PIX_FMT_YUYV422, width, height );
 646                 img_convert( &output, PIX_FMT_YUYV422, (AVPicture *)frame, pix_fmt, width, height );
 647         }
 648 #endif
 649 }
 650
 651 /** Allocate the image buffer and set it on the frame.
 652 */
 653
 654 static int allocate_buffer( mlt_properties frame_properties, AVCodecContext *codec_context, uint8_t **buffer, mlt_image_format *format, int *width, int *height )
 655 {
 656         int size = 0;
 657
 658         if ( codec_context->width == 0 || codec_context->height == 0 )
 659                 return size;
 660
 661         *width = codec_context->width;
 662         *height = codec_context->height;
 663         mlt_properties_set_int( frame_properties, "width", *width );
 664         mlt_properties_set_int( frame_properties, "height", *height );
 665
 666         if ( codec_context->pix_fmt == PIX_FMT_RGB32 )
 667                 size = *width * ( *height + 1 ) * 4;
 668         else switch ( *format )
 669         {
 670                 case mlt_image_yuv420p:
 671                         size = *width * 3 * ( *height + 1 ) / 2;
 672                         break;
 673                 case mlt_image_rgb24:
 674                         size = *width * ( *height + 1 ) * 3;
 675                         break;
 676                 default:
 677                         *format = mlt_image_yuv422;
 678                         size = *width * ( *height + 1 ) * 2;
 679                         break;
 680         }
 681
 682         // Construct the output image
 683         *buffer = mlt_pool_alloc( size );
 684         if ( *buffer )
 685                 mlt_properties_set_data( frame_properties, "image", *buffer, size, (mlt_destructor)mlt_pool_release, NULL );
 686         else
 687                 size = 0;
 688
 689         return size;
 690 }
 691
 692 /** Get an image from a frame.
 693 */
 694
 695 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 696 {
 697         // Get the properties from the frame
 698         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 699
 700         // Obtain the frame number of this frame
 701         mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
 702
 703         // Get the producer
 704         mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
 705
 706         // Get the producer properties
 707         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 708
 709         // Fetch the video_context
 710         AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
 711
 712         // Get the video_index
 713         int index = mlt_properties_get_int( properties, "video_index" );
 714
 715         // Obtain the expected frame numer
 716         mlt_position expected = mlt_properties_get_position( properties, "_video_expected" );
 717
 718         // Get the video stream
 719         AVStream *stream = context->streams[ index ];
 720
 721         // Get codec context
 722         AVCodecContext *codec_context = stream->codec;
 723
 724         // Packet
 725         AVPacket pkt;
 726
 727         // Get the conversion frame
 728         AVFrame *av_frame = mlt_properties_get_data( properties, "av_frame", NULL );
 729
 730         // Special case pause handling flag
 731         int paused = 0;
 732
 733         // Special case ffwd handling
 734         int ignore = 0;
 735
 736         // We may want to use the source fps if available
 737         double source_fps = mlt_properties_get_double( properties, "source_fps" );
 738         double fps = mlt_producer_get_fps( this );
 739
 740         // This is the physical frame position in the source
 741         int req_position = ( int )( position / fps * source_fps + 0.5 );
 742
 743         // Get the seekable status
 744         int seekable = mlt_properties_get_int( properties, "seekable" );
 745
 746         // Hopefully provide better support for streams...
 747         int av_bypass = mlt_properties_get_int( properties, "av_bypass" );
 748
 749         // Determines if we have to decode all frames in a sequence
 750         int must_decode = 1;
 751
 752         // Temporary hack to improve intra frame only
 753         must_decode = strcmp( codec_context->codec->name, "dnxhd" ) &&
 754                                   strcmp( codec_context->codec->name, "dvvideo" ) &&
 755                                   strcmp( codec_context->codec->name, "huffyuv" ) &&
 756                                   strcmp( codec_context->codec->name, "mjpeg" ) &&
 757                                   strcmp( codec_context->codec->name, "rawvideo" );
 758
 759         int last_position = mlt_properties_get_int( properties, "_last_position" );
 760
 761         // Seek if necessary
 762         if ( position != expected || last_position == -1 )
 763         {
 764                 if ( av_frame != NULL && position + 1 == expected )
 765                 {
 766                         // We're paused - use last image
 767                         paused = 1;
 768                 }
 769                 else if ( !seekable && position > expected && ( position - expected ) < 250 )
 770                 {
 771                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
 772                         ignore = ( int )( ( position - expected ) / fps * source_fps );
 773                 }
 774                 else if ( seekable && ( position < expected || position - expected >= 12 || last_position == -1 ) )
 775                 {
 776                         // Calculate the timestamp for the requested frame
 777                         int64_t timestamp = ( int64_t )( ( double )req_position / source_fps * AV_TIME_BASE + 0.5 );
 778                         if ( ( uint64_t )context->start_time != AV_NOPTS_VALUE )
 779                                 timestamp += context->start_time;
 780                         if ( must_decode )
 781                                 timestamp -= AV_TIME_BASE;
 782                         if ( timestamp < 0 )
 783                                 timestamp = 0;
 784
 785                         // Set to the timestamp
 786                         mlt_log_debug( MLT_PRODUCER_SERVICE( this ), "seeking timestamp %lld position %d expected %d last_pos %d\n",
 787                                 timestamp, position, expected, last_position );
 788                         av_seek_frame( context, -1, timestamp, AVSEEK_FLAG_BACKWARD );
 789
 790                         // Remove the cached info relating to the previous position
 791                         mlt_properties_set_int( properties, "_current_position", -1 );
 792                         mlt_properties_set_int( properties, "_last_position", -1 );
 793                         mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
 794                         av_frame = NULL;
 795                 }
 796         }
 797
 798         // Duplicate the last image if necessary (see comment on rawvideo below)
 799         int current_position = mlt_properties_get_int( properties, "_current_position" );
 800         int got_picture = mlt_properties_get_int( properties, "_got_picture" );
 801         if ( av_frame != NULL && got_picture && ( paused || current_position >= req_position ) && av_bypass == 0 )
 802         {
 803                 // Duplicate it
 804                 if ( allocate_buffer( frame_properties, codec_context, buffer, format, width, height ) )
 805                         convert_image( av_frame, *buffer, codec_context->pix_fmt, format, *width, *height );
 806                 else
 807                         mlt_frame_get_image( frame, buffer, format, width, height, writable );
 808         }
 809         else
 810         {
 811                 int ret = 0;
 812                 int int_position = 0;
 813                 got_picture = 0;
 814
 815                 av_init_packet( &pkt );
 816
 817                 // Construct an AVFrame for YUV422 conversion
 818                 if ( av_frame == NULL )
 819                         av_frame = avcodec_alloc_frame( );
 820
 821                 while( ret >= 0 && !got_picture )
 822                 {
 823                         // Read a packet
 824                         ret = av_read_frame( context, &pkt );
 825
 826                         // We only deal with video from the selected video_index
 827                         if ( ret >= 0 && pkt.stream_index == index && pkt.size > 0 )
 828                         {
 829                                 // Determine time code of the packet
 830                                 if (pkt.dts != AV_NOPTS_VALUE)
 831                                 {
 832                                         int_position = ( int )( av_q2d( stream->time_base ) * pkt.dts * source_fps + 0.5 );
 833                                         if ( context->start_time != AV_NOPTS_VALUE )
 834                                                 int_position -= ( int )( context->start_time * source_fps / AV_TIME_BASE + 0.5 );
 835                                         last_position = mlt_properties_get_int( properties, "_last_position" );
 836                                         if ( int_position == last_position )
 837                                                 int_position = last_position + 1;
 838                                 }
 839                                 else
 840                                 {
 841                                         int_position = req_position;
 842                                 }
 843                                 // Make a dumb assumption on streams that contain wild timestamps
 844                                 if ( (unsigned) req_position - (unsigned) int_position > 999 )
 845                                         int_position = req_position;
 846                                 mlt_properties_set_int( properties, "_last_position", int_position );
 847
 848                                 // Decode the image
 849                                 if ( must_decode || int_position >= req_position )
 850                                         ret = avcodec_decode_video( codec_context, av_frame, &got_picture, pkt.data, pkt.size );
 851
 852                                 if ( got_picture )
 853                                 {
 854                                         // Handle ignore
 855                                         if ( int_position < req_position )
 856                                         {
 857                                                 ignore = 0;
 858                                                 got_picture = 0;
 859                                         }
 860                                         else if ( int_position >= req_position )
 861                                         {
 862                                                 ignore = 0;
 863                                         }
 864                                         else if ( ignore -- )
 865                                         {
 866                                                 got_picture = 0;
 867                                         }
 868                                 }
 869                                 mlt_log_debug( MLT_PRODUCER_SERVICE(this), "pkt.dts %llu req_pos %d cur_pos %d pkt_pos %d got_pic %d key %d\n",
 870                                         pkt.dts, req_position, current_position, int_position, got_picture, pkt.flags & PKT_FLAG_KEY );
 871                                 av_free_packet( &pkt );
 872                         }
 873                         else if ( ret >= 0 )
 874                         {
 875                                 av_free_packet( &pkt );
 876                         }
 877
 878                         // Now handle the picture if we have one
 879                         if ( got_picture )
 880                         {
 881                                 if ( allocate_buffer( frame_properties, codec_context, buffer, format, width, height ) )
 882                                 {
 883                                         convert_image( av_frame, *buffer, codec_context->pix_fmt, format, *width, *height );
 884                                         mlt_properties_set_int( frame_properties, "progressive", !av_frame->interlaced_frame );
 885                                         mlt_properties_set_int( properties, "top_field_first", av_frame->top_field_first );
 886                                         mlt_properties_set_int( properties, "_current_position", int_position );
 887                                         mlt_properties_set_int( properties, "_got_picture", 1 );
 888                                         mlt_properties_set_data( properties, "av_frame", av_frame, 0, av_free, NULL );
 889                                 }
 890                                 else
 891                                 {
 892                                         got_picture = 0;
 893                                 }
 894                         }
 895                 }
 896                 if ( !got_picture )
 897                         mlt_frame_get_image( frame, buffer, format, width, height, writable );
 898         }
 899
 900         // Very untidy - for rawvideo, the packet contains the frame, hence the free packet
 901         // above will break the pause behaviour - so we wipe the frame now
 902         if ( !strcmp( codec_context->codec->name, "rawvideo" ) )
 903                 mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
 904
 905         // Set the field order property for this frame
 906         mlt_properties_set_int( frame_properties, "top_field_first", mlt_properties_get_int( properties, "top_field_first" ) );
 907
 908         // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
 909         mlt_properties_set_position( properties, "_video_expected", position + 1 );
 910
 911         return 0;
 912 }
 913
 914 /** Process properties as AVOptions and apply to AV context obj
 915 */
 916
 917 static void apply_properties( void *obj, mlt_properties properties, int flags )
 918 {
 919         int i;
 920         int count = mlt_properties_count( properties );
 921         for ( i = 0; i < count; i++ )
 922         {
 923                 const char *opt_name = mlt_properties_get_name( properties, i );
 924                 const AVOption *opt = av_find_opt( obj, opt_name, NULL, flags, flags );
 925                 if ( opt != NULL )
 926 #if LIBAVCODEC_VERSION_INT >= ((52<<16)+(7<<8)+0)
 927                         av_set_string3( obj, opt_name, mlt_properties_get( properties, opt_name), 0, NULL );
 928 #elif LIBAVCODEC_VERSION_INT >= ((51<<16)+(59<<8)+0)
 929                         av_set_string2( obj, opt_name, mlt_properties_get( properties, opt_name), 0 );
 930 #else
 931                         av_set_string( obj, opt_name, mlt_properties_get( properties, opt_name) );
 932 #endif
 933         }
 934 }
 935
 936 /** Set up video handling.
 937 */
 938
 939 static void producer_set_up_video( mlt_producer this, mlt_frame frame )
 940 {
 941         // Get the properties
 942         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 943
 944         // Fetch the video_context
 945         AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
 946
 947         // Get the video_index
 948         int index = mlt_properties_get_int( properties, "video_index" );
 949
 950         // Reopen the file if necessary
 951         if ( !context && index > -1 )
 952         {
 953                 mlt_events_block( properties, this );
 954                 producer_open( this, mlt_service_profile( MLT_PRODUCER_SERVICE(this) ),
 955                         mlt_properties_get( properties, "resource" ) );
 956                 context = mlt_properties_get_data( properties, "video_context", NULL );
 957                 mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
 958                 mlt_events_unblock( properties, this );
 959
 960                 // Process properties as AVOptions
 961                 apply_properties( context, properties, AV_OPT_FLAG_DECODING_PARAM );
 962         }
 963
 964         // Exception handling for video_index
 965         if ( context && index >= (int) context->nb_streams )
 966         {
 967                 // Get the last video stream
 968                 for ( index = context->nb_streams - 1; index >= 0 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_VIDEO; --index );
 969                 mlt_properties_set_int( properties, "video_index", index );
 970         }
 971         if ( context && index > -1 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_VIDEO )
 972         {
 973                 // Invalidate the video stream
 974                 index = -1;
 975                 mlt_properties_set_int( properties, "video_index", index );
 976         }
 977
 978         // Get the frame properties
 979         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 980
 981         if ( context && index > -1 )
 982         {
 983                 // Get the video stream
 984                 AVStream *stream = context->streams[ index ];
 985
 986                 // Get codec context
 987                 AVCodecContext *codec_context = stream->codec;
 988
 989                 // Get the codec
 990                 AVCodec *codec = mlt_properties_get_data( properties, "video_codec", NULL );
 991
 992                 // Update the video properties if the index changed
 993                 if ( index != mlt_properties_get_int( properties, "_video_index" ) )
 994                 {
 995                         // Reset the video properties if the index changed
 996                         mlt_properties_set_int( properties, "_video_index", index );
 997                         mlt_properties_set_data( properties, "video_codec", NULL, 0, NULL, NULL );
 998                         mlt_properties_set_int( properties, "width", codec_context->width );
 999                         mlt_properties_set_int( properties, "height", codec_context->height );
1000                         // TODO: get the first usable AVPacket and reset the stream position
1001                         mlt_properties_set_double( properties, "aspect_ratio",
1002                                 get_aspect_ratio( context->streams[ index ], codec_context, NULL ) );
1003                         codec = NULL;
1004                 }
1005
1006                 // Initialise the codec if necessary
1007                 if ( codec == NULL )
1008                 {
1009                         // Initialise multi-threading
1010                         int thread_count = mlt_properties_get_int( properties, "threads" );
1011                         if ( thread_count == 0 && getenv( "MLT_AVFORMAT_THREADS" ) )
1012                                 thread_count = atoi( getenv( "MLT_AVFORMAT_THREADS" ) );
1013                         if ( thread_count > 1 )
1014                         {
1015                                 avcodec_thread_init( codec_context, thread_count );
1016                                 codec_context->thread_count = thread_count;
1017                         }
1018
1019                         // Find the codec
1020                         codec = avcodec_find_decoder( codec_context->codec_id );
1021
1022                         // If we don't have a codec and we can't initialise it, we can't do much more...
1023                         avformat_lock( );
1024                         if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
1025                         {
1026                                 // Now store the codec with its destructor
1027                                 mlt_properties_set_data( properties, "video_codec", codec_context, 0, producer_codec_close, NULL );
1028                         }
1029                         else
1030                         {
1031                                 // Remember that we can't use this later
1032                                 mlt_properties_set_int( properties, "video_index", -1 );
1033                                 index = -1;
1034                         }
1035                         avformat_unlock( );
1036
1037                         // Process properties as AVOptions
1038                         apply_properties( codec_context, properties, AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM );
1039                 }
1040
1041                 // No codec, no show...
1042                 if ( codec && index > -1 )
1043                 {
1044                         double source_fps = 0;
1045                         double force_aspect_ratio = mlt_properties_get_double( properties, "force_aspect_ratio" );
1046                         double aspect_ratio = ( force_aspect_ratio > 0.0 ) ?
1047                                 force_aspect_ratio : mlt_properties_get_double( properties, "aspect_ratio" );
1048
1049                         // Determine the fps
1050                         source_fps = ( double )codec_context->time_base.den / ( codec_context->time_base.num == 0 ? 1 : codec_context->time_base.num );
1051
1052                         // We'll use fps if it's available
1053                         if ( source_fps > 0 )
1054                                 mlt_properties_set_double( properties, "source_fps", source_fps );
1055                         else
1056                                 mlt_properties_set_double( properties, "source_fps", mlt_producer_get_fps( this ) );
1057                         mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
1058
1059                         // Set the width and height
1060                         mlt_properties_set_int( frame_properties, "width", codec_context->width );
1061                         mlt_properties_set_int( frame_properties, "height", codec_context->height );
1062                         mlt_properties_set_int( frame_properties, "real_width", codec_context->width );
1063                         mlt_properties_set_int( frame_properties, "real_height", codec_context->height );
1064                         mlt_properties_set_double( frame_properties, "aspect_ratio", aspect_ratio );
1065
1066                         mlt_frame_push_get_image( frame, producer_get_image );
1067                         mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
1068                 }
1069                 else
1070                 {
1071                         mlt_properties_set_int( frame_properties, "test_image", 1 );
1072                 }
1073         }
1074         else
1075         {
1076                 mlt_properties_set_int( frame_properties, "test_image", 1 );
1077         }
1078 }
1079
1080 /** Get the audio from a frame.
1081 */
1082
1083 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
1084 {
1085         // Get the properties from the frame
1086         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
1087
1088         // Obtain the frame number of this frame
1089         mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
1090
1091         // Get the producer
1092         mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
1093
1094         // Get the producer properties
1095         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
1096
1097         // Fetch the audio_context
1098         AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
1099
1100         // Get the audio_index
1101         int index = mlt_properties_get_int( properties, "audio_index" );
1102
1103         // Get the seekable status
1104         int seekable = mlt_properties_get_int( properties, "seekable" );
1105
1106         // Obtain the expected frame numer
1107         mlt_position expected = mlt_properties_get_position( properties, "_audio_expected" );
1108
1109         // Obtain the resample context if it exists (not always needed)
1110         ReSampleContext *resample = mlt_properties_get_data( properties, "audio_resample", NULL );
1111
1112         // Obtain the audio buffers
1113         int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
1114         int16_t *decode_buffer = mlt_properties_get_data( properties, "decode_buffer", NULL );
1115
1116         // Get amount of audio used
1117         int audio_used =  mlt_properties_get_int( properties, "_audio_used" );
1118
1119         // Calculate the real time code
1120         double real_timecode = producer_time_of_frame( this, position );
1121
1122         // Get the audio stream
1123         AVStream *stream = context->streams[ index ];
1124
1125         // Get codec context
1126         AVCodecContext *codec_context = stream->codec;
1127
1128         // Packet
1129         AVPacket pkt;
1130
1131         // Number of frames to ignore (for ffwd)
1132         int ignore = 0;
1133
1134         // Flag for paused (silence)
1135         int paused = 0;
1136
1137         // Check for resample and create if necessary
1138         if ( resample == NULL && codec_context->channels <= 2 )
1139         {
1140                 // Create the resampler
1141 #if (LIBAVCODEC_VERSION_INT >= ((52<<16)+(15<<8)+0))
1142                 resample = av_audio_resample_init( *channels, codec_context->channels, *frequency, codec_context->sample_rate,
1143                         SAMPLE_FMT_S16, codec_context->sample_fmt, 16, 10, 0, 0.8 );
1144 #else
1145                 resample = audio_resample_init( *channels, codec_context->channels, *frequency, codec_context->sample_rate );
1146 #endif
1147
1148                 // And store it on properties
1149                 mlt_properties_set_data( properties, "audio_resample", resample, 0, ( mlt_destructor )audio_resample_close, NULL );
1150         }
1151         else if ( resample == NULL )
1152         {
1153                 // TODO: uncomment and remove following line when full multi-channel support is ready
1154                 // *channels = codec_context->channels;
1155                 codec_context->request_channels = *channels;
1156
1157                 *frequency = codec_context->sample_rate;
1158         }
1159
1160         // Check for audio buffer and create if necessary
1161         if ( audio_buffer == NULL )
1162         {
1163                 // Allocate the audio buffer
1164                 audio_buffer = mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
1165
1166                 // And store it on properties for reuse
1167                 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
1168         }
1169
1170         // Check for decoder buffer and create if necessary
1171         if ( decode_buffer == NULL )
1172         {
1173                 // Allocate the audio buffer
1174                 decode_buffer = av_malloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
1175
1176                 // And store it on properties for reuse
1177                 mlt_properties_set_data( properties, "decode_buffer", decode_buffer, 0, ( mlt_destructor )av_free, NULL );
1178         }
1179
1180         // Seek if necessary
1181         if ( position != expected )
1182         {
1183                 if ( position + 1 == expected )
1184                 {
1185                         // We're paused - silence required
1186                         paused = 1;
1187                 }
1188                 else if ( !seekable && position > expected && ( position - expected ) < 250 )
1189                 {
1190                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
1191                         ignore = position - expected;
1192                 }
1193                 else if ( position < expected || position - expected >= 12 )
1194                 {
1195                         int64_t timestamp = ( int64_t )( real_timecode * AV_TIME_BASE + 0.5 );
1196                         if ( context->start_time != AV_NOPTS_VALUE )
1197                                 timestamp += context->start_time;
1198                         if ( timestamp < 0 )
1199                                 timestamp = 0;
1200
1201                         // Set to the real timecode
1202                         if ( av_seek_frame( context, -1, timestamp, AVSEEK_FLAG_BACKWARD ) != 0 )
1203                                 paused = 1;
1204
1205                         // Clear the usage in the audio buffer
1206                         audio_used = 0;
1207                 }
1208         }
1209
1210         // Get the audio if required
1211         if ( !paused )
1212         {
1213                 int ret = 0;
1214                 int got_audio = 0;
1215
1216                 av_init_packet( &pkt );
1217
1218                 while( ret >= 0 && !got_audio )
1219                 {
1220                         // Check if the buffer already contains the samples required
1221                         if ( audio_used >= *samples && ignore == 0 )
1222                         {
1223                                 got_audio = 1;
1224                                 break;
1225                         }
1226
1227                         // Read a packet
1228                         ret = av_read_frame( context, &pkt );
1229
1230                         int len = pkt.size;
1231                         uint8_t *ptr = pkt.data;
1232
1233                         // We only deal with audio from the selected audio_index
1234                         while ( ptr != NULL && ret >= 0 && pkt.stream_index == index && len > 0 )
1235                         {
1236                                 int data_size = sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE;
1237
1238                                 // Decode the audio
1239 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(29<<8)+0))
1240                                 ret = avcodec_decode_audio2( codec_context, decode_buffer, &data_size, ptr, len );
1241 #else
1242                                 ret = avcodec_decode_audio( codec_context, decode_buffer, &data_size, ptr, len );
1243 #endif
1244                                 if ( ret < 0 )
1245                                 {
1246                                         ret = 0;
1247                                         break;
1248                                 }
1249
1250                                 len -= ret;
1251                                 ptr += ret;
1252
1253                                 if ( data_size > 0 && ( audio_used * *channels + data_size < AVCODEC_MAX_AUDIO_FRAME_SIZE ) )
1254                                 {
1255                                         if ( resample )
1256                                         {
1257                                                 int16_t *source = decode_buffer;
1258                                                 int16_t *dest = &audio_buffer[ audio_used * *channels ];
1259                                                 int convert_samples = data_size / av_get_bits_per_sample_format( codec_context->sample_fmt ) * 8 / codec_context->channels;
1260
1261                                                 audio_used += audio_resample( resample, dest, source, convert_samples );
1262                                         }
1263                                         else
1264                                         {
1265                                                 memcpy( &audio_buffer[ audio_used * *channels ], decode_buffer, data_size );
1266                                                 audio_used += data_size / *channels / av_get_bits_per_sample_format( codec_context->sample_fmt ) * 8;
1267                                         }
1268
1269                                         // Handle ignore
1270                                         while ( ignore && audio_used > *samples )
1271                                         {
1272                                                 ignore --;
1273                                                 audio_used -= *samples;
1274                                                 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
1275                                         }
1276                                 }
1277
1278                                 // If we're behind, ignore this packet
1279                                 if ( pkt.pts >= 0 )
1280                                 {
1281                                         double current_pts = av_q2d( stream->time_base ) * pkt.pts;
1282                                         double source_fps = mlt_properties_get_double( properties, "source_fps" );
1283                                         int req_position = ( int )( real_timecode * source_fps + 0.5 );
1284                                         int int_position = ( int )( current_pts * source_fps + 0.5 );
1285
1286                                         if ( context->start_time != AV_NOPTS_VALUE )
1287                                                 int_position -= ( int )( context->start_time * source_fps / AV_TIME_BASE + 0.5 );
1288                                         if ( seekable && !ignore && int_position < req_position )
1289                                                 ignore = 1;
1290                                 }
1291                         }
1292
1293                         // We're finished with this packet regardless
1294                         av_free_packet( &pkt );
1295                 }
1296
1297                 *buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
1298                 mlt_properties_set_data( frame_properties, "audio", *buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
1299
1300                 // Now handle the audio if we have enough
1301                 if ( audio_used >= *samples )
1302                 {
1303                         memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
1304                         audio_used -= *samples;
1305                         memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
1306                 }
1307                 else
1308                 {
1309                         memset( *buffer, 0, *samples * *channels * sizeof( int16_t ) );
1310                 }
1311
1312                 // Store the number of audio samples still available
1313                 mlt_properties_set_int( properties, "_audio_used", audio_used );
1314         }
1315         else
1316         {
1317                 // Get silence and don't touch the context
1318                 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
1319         }
1320
1321         // Regardless of speed (other than paused), we expect to get the next frame
1322         if ( !paused )
1323                 mlt_properties_set_position( properties, "_audio_expected", position + 1 );
1324
1325         return 0;
1326 }
1327
1328 /** Set up audio handling.
1329 */
1330
1331 static void producer_set_up_audio( mlt_producer this, mlt_frame frame )
1332 {
1333         // Get the properties
1334         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
1335
1336         // Fetch the audio_context
1337         AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
1338
1339         // Get the audio_index
1340         int index = mlt_properties_get_int( properties, "audio_index" );
1341
1342         // Reopen the file if necessary
1343         if ( !context && index > -1 )
1344         {
1345                 mlt_events_block( properties, this );
1346                 producer_open( this, mlt_service_profile( MLT_PRODUCER_SERVICE(this) ),
1347                         mlt_properties_get( properties, "resource" ) );
1348                 context = mlt_properties_get_data( properties, "audio_context", NULL );
1349                 mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
1350                 mlt_events_unblock( properties, this );
1351         }
1352
1353         // Exception handling for audio_index
1354         if ( context && index >= (int) context->nb_streams )
1355         {
1356                 for ( index = context->nb_streams - 1; index >= 0 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_AUDIO; --index );
1357                 mlt_properties_set_int( properties, "audio_index", index );
1358         }
1359         if ( context && index > -1 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_AUDIO )
1360         {
1361                 index = -1;
1362                 mlt_properties_set_int( properties, "audio_index", index );
1363         }
1364
1365         // Update the audio properties if the index changed
1366         if ( index > -1 && index != mlt_properties_get_int( properties, "_audio_index" ) )
1367         {
1368                 mlt_properties_set_int( properties, "_audio_index", index );
1369                 mlt_properties_set_data( properties, "audio_codec", NULL, 0, NULL, NULL );
1370         }
1371
1372         // Deal with audio context
1373         if ( context != NULL && index > -1 )
1374         {
1375                 // Get the frame properties
1376                 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
1377
1378                 // Get the audio stream
1379                 AVStream *stream = context->streams[ index ];
1380
1381                 // Get codec context
1382                 AVCodecContext *codec_context = stream->codec;
1383
1384                 // Get the codec
1385                 AVCodec *codec = mlt_properties_get_data( properties, "audio_codec", NULL );
1386
1387                 // Initialise the codec if necessary
1388                 if ( codec == NULL )
1389                 {
1390                         // Find the codec
1391                         codec = avcodec_find_decoder( codec_context->codec_id );
1392
1393                         // If we don't have a codec and we can't initialise it, we can't do much more...
1394                         avformat_lock( );
1395                         if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
1396                         {
1397                                 // Now store the codec with its destructor
1398                                 mlt_properties_set_data( properties, "audio_codec", codec_context, 0, producer_codec_close, NULL );
1399
1400                         }
1401                         else
1402                         {
1403                                 // Remember that we can't use this later
1404                                 mlt_properties_set_int( properties, "audio_index", -1 );
1405                                 index = -1;
1406                         }
1407                         avformat_unlock( );
1408
1409                         // Process properties as AVOptions
1410                         apply_properties( codec_context, properties, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM );
1411                 }
1412
1413                 // No codec, no show...
1414                 if ( codec && index > -1 )
1415                 {
1416                         mlt_frame_push_audio( frame, producer_get_audio );
1417                         mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
1418                         mlt_properties_set_int( frame_properties, "frequency", codec_context->sample_rate );
1419                         mlt_properties_set_int( frame_properties, "channels", codec_context->channels );
1420                 }
1421         }
1422 }
1423
1424 /** Our get frame implementation.
1425 */
1426
1427 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
1428 {
1429         // Create an empty frame
1430         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
1431
1432         // Update timecode on the frame we're creating
1433         mlt_frame_set_position( *frame, mlt_producer_position( this ) );
1434
1435         // Set the position of this producer
1436         mlt_properties_set_position( MLT_FRAME_PROPERTIES( *frame ), "avformat_position", mlt_producer_frame( this ) );
1437
1438         // Set up the video
1439         producer_set_up_video( this, *frame );
1440
1441         // Set up the audio
1442         producer_set_up_audio( this, *frame );
1443
1444         // Set the aspect_ratio
1445         mlt_properties_set_double( MLT_FRAME_PROPERTIES( *frame ), "aspect_ratio", mlt_properties_get_double( MLT_PRODUCER_PROPERTIES( this ), "aspect_ratio" ) );
1446
1447         // Calculate the next timecode
1448         mlt_producer_prepare_next( this );
1449
1450         return 0;
1451 }