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  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 // Local header files
  22 #include "producer_avformat.h"
  23
  24 // MLT Header files
  25 #include <framework/mlt_frame.h>
  26
  27 // ffmpeg Header files
  28 #include <ffmpeg/avformat.h>
  29
  30 // System header files
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <pthread.h>
  34 #include <math.h>
  35
  36 // Forward references.
  37 static int producer_open( mlt_producer this, char *file );
  38 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
  39
  40 // A static flag used to determine if avformat has been initialised
  41 static int avformat_initialised = 0;
  42 static pthread_mutex_t avformat_mutex;
  43
  44 void *av_malloc( unsigned int size )
  45 {
  46         return mlt_pool_alloc( size );
  47 }
  48
  49 void *av_realloc( void *ptr, unsigned int size )
  50 {
  51         return mlt_pool_realloc( ptr, size );
  52 }
  53
  54 void av_free( void *ptr )
  55 {
  56         return mlt_pool_release( ptr );
  57 }
  58
  59 /** Constructor for libavformat.
  60 */
  61
  62 mlt_producer producer_avformat_init( char *file )
  63 {
  64         mlt_producer this = NULL;
  65
  66         // Check that we have a non-NULL argument
  67         if ( file != NULL )
  68         {
  69                 // Construct the producer
  70                 this = calloc( 1, sizeof( struct mlt_producer_s ) );
  71
  72                 // Initialise it
  73                 if ( mlt_producer_init( this, NULL ) == 0 )
  74                 {
  75                         // Get the properties
  76                         mlt_properties properties = mlt_producer_properties( this );
  77
  78                         // Set the resource property (required for all producers)
  79                         mlt_properties_set( properties, "resource", file );
  80
  81                         // TEST: audio sync tweaking
  82                         mlt_properties_set_double( properties, "discrepancy", 1 );
  83
  84                         // Register our get_frame implementation
  85                         this->get_frame = producer_get_frame;
  86
  87                         // Initialise avformat if necessary
  88                         if ( avformat_initialised == 0 )
  89                         {
  90                                 avformat_initialised = 1;
  91                                 pthread_mutex_init( &avformat_mutex, NULL );
  92                                 av_register_all( );
  93                         }
  94
  95                         // Open the file
  96                         if ( producer_open( this, file ) != 0 )
  97                         {
  98                                 // Clean up
  99                                 mlt_producer_close( this );
 100                                 this = NULL;
 101                         }
 102                 }
 103         }
 104
 105         return this;
 106 }
 107
 108 /** Find the default streams.
 109 */
 110
 111 static void find_default_streams( AVFormatContext *context, int *audio_index, int *video_index )
 112 {
 113         int i;
 114
 115         // Allow for multiple audio and video streams in the file and select first of each (if available)
 116         for( i = 0; i < context->nb_streams; i++ )
 117         {
 118                 // Get the codec context
 119                 AVCodecContext *codec_context = &context->streams[ i ]->codec;
 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                                 break;
 128                         case CODEC_TYPE_AUDIO:
 129                                 if ( *audio_index < 0 )
 130                                         *audio_index = i;
 131                                 break;
 132                         default:
 133                                 break;
 134                 }
 135         }
 136 }
 137
 138 /** Producer file destructor.
 139 */
 140
 141 static void producer_file_close( void *context )
 142 {
 143         if ( context != NULL )
 144         {
 145                 // Lock the mutex now
 146                 pthread_mutex_lock( &avformat_mutex );
 147
 148                 // Close the file
 149                 av_close_input_file( context );
 150
 151                 // Unlock the mutex now
 152                 pthread_mutex_unlock( &avformat_mutex );
 153         }
 154 }
 155
 156 /** Producer file destructor.
 157 */
 158
 159 static void producer_codec_close( void *codec )
 160 {
 161         if ( codec != NULL )
 162         {
 163                 // Lock the mutex now
 164                 pthread_mutex_lock( &avformat_mutex );
 165
 166                 // Close the file
 167                 avcodec_close( codec );
 168
 169                 // Unlock the mutex now
 170                 pthread_mutex_unlock( &avformat_mutex );
 171         }
 172 }
 173
 174 /** Open the file.
 175 */
 176
 177 static int producer_open( mlt_producer this, char *file )
 178 {
 179         // Return an error code (0 == no error)
 180         int error = 0;
 181
 182         // Context for avformat
 183         AVFormatContext *context = NULL;
 184
 185         // Get the properties
 186         mlt_properties properties = mlt_producer_properties( this );
 187
 188         // We will treat everything with the producer fps
 189         double fps = mlt_properties_get_double( properties, "fps" );
 190
 191         // Lock the mutex now
 192         pthread_mutex_lock( &avformat_mutex );
 193
 194         // If "MRL", then create AVInputFormat
 195         AVInputFormat *format = NULL;
 196         AVFormatParameters *params = NULL;
 197         char *standard = NULL;
 198         char *mrl = strchr( file, ':' );
 199
 200         // Only if there is not a protocol specification that avformat can handle
 201         if ( mrl && !url_exist( file ) )
 202         {
 203                 // 'file' becomes format abbreviation
 204                 mrl[0] = 0;
 205
 206                 // Lookup the format
 207                 format = av_find_input_format( file );
 208
 209                 // Eat the format designator
 210                 file = ++mrl;
 211
 212                 if ( format )
 213                 {
 214                         // Allocate params
 215                         params = calloc( sizeof( AVFormatParameters ), 1 );
 216
 217                         // These are required by video4linux (defaults)
 218                         params->width = 640;
 219                         params->height = 480;
 220                         params->frame_rate = 25;
 221                         params->frame_rate_base = 1;
 222                         params->device = file;
 223                         params->channels = 2;
 224                         params->sample_rate = 48000;
 225                 }
 226
 227                 // Parse out params
 228                 mrl = strchr( file, '?' );
 229                 while ( mrl )
 230                 {
 231                         mrl[0] = 0;
 232                         char *name = strdup( ++mrl );
 233                         char *value = strchr( name, '=' );
 234                         if ( value )
 235                         {
 236                                 value[0] = 0;
 237                                 value++;
 238                                 char *t = strchr( value, '&' );
 239                                 if ( t )
 240                                         t[0] = 0;
 241                                 if ( !strcmp( name, "frame_rate" ) )
 242                                         params->frame_rate = atoi( value );
 243                                 else if ( !strcmp( name, "frame_rate_base" ) )
 244                                         params->frame_rate_base = atoi( value );
 245                                 else if ( !strcmp( name, "sample_rate" ) )
 246                                         params->sample_rate = atoi( value );
 247                                 else if ( !strcmp( name, "channels" ) )
 248                                         params->channels = atoi( value );
 249                                 else if ( !strcmp( name, "width" ) )
 250                                         params->width = atoi( value );
 251                                 else if ( !strcmp( name, "height" ) )
 252                                         params->height = atoi( value );
 253                                 else if ( !strcmp( name, "standard" ) )
 254                                 {
 255                                         standard = strdup( value );
 256                                         params->standard = standard;
 257                                 }
 258                         }
 259                         free( name );
 260                         mrl = strchr( mrl, '&' );
 261                 }
 262         }
 263
 264         // Now attempt to open the file
 265         error = av_open_input_file( &context, file, format, 0, params );
 266         error = error < 0;
 267
 268         // Cleanup AVFormatParameters
 269         free( standard );
 270         free( params );
 271
 272         // If successful, then try to get additional info
 273         if ( error == 0 )
 274         {
 275                 // Get the stream info
 276                 error = av_find_stream_info( context ) < 0;
 277
 278                 // Continue if no error
 279                 if ( error == 0 )
 280                 {
 281                         // We will default to the first audio and video streams found
 282                         int audio_index = -1;
 283                         int video_index = -1;
 284
 285                         // Now set properties where we can (use default unknowns if required)
 286                         if ( context->duration != AV_NOPTS_VALUE )
 287                         {
 288                                 // This isn't going to be accurate for all formats
 289                                 mlt_position frames = ( mlt_position )( ( ( double )context->duration / ( double )AV_TIME_BASE ) * fps );
 290                                 mlt_properties_set_position( properties, "out", frames - 2 );
 291                                 mlt_properties_set_position( properties, "length", frames - 1 );
 292                         }
 293
 294                         // Find default audio and video streams
 295                         find_default_streams( context, &audio_index, &video_index );
 296
 297                         // Store selected audio and video indexes on properties
 298                         mlt_properties_set_int( properties, "audio_index", audio_index );
 299                         mlt_properties_set_int( properties, "video_index", video_index );
 300
 301                         // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
 302                         if ( audio_index != -1 && video_index != -1 )
 303                         {
 304                                 // We'll use the open one as our video_context
 305                                 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
 306
 307                                 // And open again for our audio context
 308                                 av_open_input_file( &context, file, NULL, 0, NULL );
 309                                 av_find_stream_info( context );
 310
 311                                 // Audio context
 312                                 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
 313                         }
 314                         else if ( video_index != -1 )
 315                         {
 316                                 // We only have a video context
 317                                 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
 318                         }
 319                         else if ( audio_index != -1 )
 320                         {
 321                                 // We only have an audio context
 322                                 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
 323                         }
 324                         else
 325                         {
 326                                 // Something has gone wrong
 327                                 error = -1;
 328                         }
 329                 }
 330         }
 331
 332         // Unlock the mutex now
 333         pthread_mutex_unlock( &avformat_mutex );
 334
 335         return error;
 336 }
 337
 338 /** Convert a frame position to a time code.
 339 */
 340
 341 static double producer_time_of_frame( mlt_producer this, mlt_position position )
 342 {
 343         // Get the properties
 344         mlt_properties properties = mlt_producer_properties( this );
 345
 346         // Obtain the fps
 347         double fps = mlt_properties_get_double( properties, "fps" );
 348
 349         // Do the calc
 350         return ( double )position / fps;
 351 }
 352
 353 /** Get an image from a frame.
 354 */
 355
 356 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 357 {
 358         // Get the properties from the frame
 359         mlt_properties frame_properties = mlt_frame_properties( frame );
 360
 361         // Obtain the frame number of this frame
 362         mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
 363
 364         // Get the producer
 365         mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
 366
 367         // Get the producer properties
 368         mlt_properties properties = mlt_producer_properties( this );
 369
 370         // Fetch the video_context
 371         AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
 372
 373         // Get the video_index
 374         int index = mlt_properties_get_int( properties, "video_index" );
 375
 376         // Obtain the expected frame numer
 377         mlt_position expected = mlt_properties_get_position( properties, "video_expected" );
 378
 379         // Calculate the real time code
 380         double real_timecode = producer_time_of_frame( this, position ) + mlt_properties_get_double( properties, "_v_pts_offset" );
 381
 382         // Get the video stream
 383         AVStream *stream = context->streams[ index ];
 384
 385         // Get codec context
 386         AVCodecContext *codec_context = &stream->codec;
 387
 388         // Packet
 389         AVPacket pkt;
 390
 391         // Get the conversion frame
 392         AVPicture *output = mlt_properties_get_data( properties, "video_output_frame", NULL );
 393
 394         // Special case pause handling flag
 395         int paused = 0;
 396
 397         // Special case ffwd handling
 398         int ignore = 0;
 399
 400         // Current time calcs
 401         double current_time = mlt_properties_get_double( properties, "current_time" );
 402
 403         // We may want to use the source fps if available
 404         double source_fps = mlt_properties_get_double( properties, "source_fps" );
 405
 406         // Set the result arguments that we know here (only *buffer is now required)
 407         *format = mlt_image_yuv422;
 408         *width = codec_context->width;
 409         *height = codec_context->height;
 410
 411         // Set this on the frame properties
 412         mlt_properties_set_int( frame_properties, "width", *width );
 413         mlt_properties_set_int( frame_properties, "height", *height );
 414
 415         // Lock the mutex now
 416         pthread_mutex_lock( &avformat_mutex );
 417
 418         // Construct an AVFrame for YUV422 conversion
 419         if ( output == NULL )
 420         {
 421                 int size = avpicture_get_size( PIX_FMT_YUV422, *width, *height );
 422                 size += *width * 2;
 423                 uint8_t *buf = mlt_pool_alloc( size );
 424                 output = mlt_pool_alloc( sizeof( AVPicture ) );
 425                 //memset( output, 0, sizeof( AVPicture ) );
 426                 avpicture_fill( output, buf, PIX_FMT_YUV422, *width, *height );
 427                 mlt_properties_set_data( properties, "video_output_frame", output, 0, ( mlt_destructor )mlt_pool_release, NULL );
 428                 mlt_properties_set_data( properties, "video_output_buffer", buf, 0, ( mlt_destructor )mlt_pool_release, NULL );
 429         }
 430
 431         // Seek if necessary
 432         if ( position != expected )
 433         {
 434                 if ( position + 1 == expected )
 435                 {
 436                         // We're paused - use last image
 437                         paused = 1;
 438                 }
 439                 else if ( position > expected && ( position - expected ) < 250 )
 440                 {
 441                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
 442                         ignore = position - expected;
 443                 }
 444                 else
 445                 {
 446                         // Set to the real timecode
 447                         av_seek_frame( context, -1, real_timecode * 1000000.0 );
 448
 449                         // Remove the cached info relating to the previous position
 450                         mlt_properties_set_double( properties, "current_time", real_timecode );
 451                         mlt_properties_set_data( properties, "current_image", NULL, 0, NULL, NULL );
 452                 }
 453         }
 454
 455         // Duplicate the last image if necessary
 456         if ( mlt_properties_get_data( properties, "current_image", NULL ) != NULL &&
 457                  ( paused || mlt_properties_get_double( properties, "current_time" ) >= real_timecode ) )
 458         {
 459                 // Get current image and size
 460                 int size = 0;
 461                 uint8_t *image = mlt_properties_get_data( properties, "current_image", &size );
 462
 463                 // Duplicate it
 464                 *buffer = mlt_pool_alloc( size );
 465                 memcpy( *buffer, image, size );
 466
 467                 // Set this on the frame properties
 468                 mlt_properties_set_data( frame_properties, "image", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
 469         }
 470         else
 471         {
 472                 int ret = 0;
 473                 int got_picture = 0;
 474                 AVFrame frame;
 475
 476                 memset( &pkt, 0, sizeof( pkt ) );
 477                 memset( &frame, 0, sizeof( frame ) );
 478
 479                 while( ret >= 0 && !got_picture )
 480                 {
 481                         // Read a packet
 482                         ret = av_read_frame( context, &pkt );
 483
 484                         // We only deal with video from the selected video_index
 485                         if ( ret >= 0 && pkt.stream_index == index && pkt.size > 0 )
 486                         {
 487                                 // Decode the image
 488                                 ret = avcodec_decode_video( codec_context, &frame, &got_picture, pkt.data, pkt.size );
 489
 490                                 if ( got_picture )
 491                                 {
 492                                         if ( pkt.pts != AV_NOPTS_VALUE && pkt.pts != 0  )
 493                                         {
 494                                                 if ( current_time == 0 )
 495                                                 {
 496                                                         mlt_properties_set_double( properties, "_v_pts_offset", ( double )( pkt.pts / 1000000 ) );
 497                                                         real_timecode += pkt.pts / 1000000;
 498                                                 }
 499                                                 current_time = ( double )pkt.pts / 1000000.0;
 500                                         }
 501                                         else
 502                                                 current_time = real_timecode;
 503
 504                                         // Handle ignore
 505                                         if ( current_time < real_timecode )
 506                                         {
 507                                                 ignore = 0;
 508                                                 got_picture = 0;
 509                                         }
 510                                         else if ( current_time >= real_timecode )
 511                                         {
 512                                                 //current_time = real_timecode;
 513                                                 ignore = 0;
 514                                         }
 515                                         else if ( ignore -- )
 516                                         {
 517                                                 got_picture = 0;
 518                                         }
 519                                 }
 520                         }
 521
 522                         // We're finished with this packet regardless
 523                         av_free_packet( &pkt );
 524                 }
 525
 526                 // Now handle the picture if we have one
 527                 if ( got_picture )
 528                 {
 529                         // Get current image and size
 530                         int size = 0;
 531                         uint8_t *image = mlt_properties_get_data( properties, "current_image", &size );
 532
 533                         if ( image == NULL || size != *width * *height * 2 )
 534                         {
 535                                 size = *width * ( *height + 1 ) * 2;
 536                                 image = mlt_pool_alloc( size );
 537                                 mlt_properties_set_data( properties, "current_image", image, size, ( mlt_destructor )mlt_pool_release, NULL );
 538                         }
 539
 540                         *buffer = mlt_pool_alloc( size );
 541
 542                         // EXPERIMENTAL IMAGE NORMALISATIONS
 543                         if ( codec_context->pix_fmt == PIX_FMT_YUV420P )
 544                         {
 545                                 register int i, j;
 546                                 register int half = *width >> 1;
 547                                 register uint8_t *Y = ( ( AVPicture * )&frame )->data[ 0 ];
 548                                 register uint8_t *U = ( ( AVPicture * )&frame )->data[ 1 ];
 549                                 register uint8_t *V = ( ( AVPicture * )&frame )->data[ 2 ];
 550                                 register uint8_t *d = *buffer;
 551                                 register uint8_t *y, *u, *v;
 552
 553                                 i = *height >> 1;
 554                                 while ( i -- )
 555                                 {
 556                                         y = Y;
 557                                         u = U;
 558                                         v = V;
 559                                         j = half;
 560                                         while ( j -- )
 561                                         {
 562                                                 *d ++ = *y ++;
 563                                                 *d ++ = *u ++;
 564                                                 *d ++ = *y ++;
 565                                                 *d ++ = *v ++;
 566                                         }
 567
 568                                         Y += ( ( AVPicture * )&frame )->linesize[ 0 ];
 569                                         y = Y;
 570                                         u = U;
 571                                         v = V;
 572                                         j = half;
 573                                         while ( j -- )
 574                                         {
 575                                                 *d ++ = *y ++;
 576                                                 *d ++ = *u ++;
 577                                                 *d ++ = *y ++;
 578                                                 *d ++ = *v ++;
 579                                         }
 580
 581                                         Y += ( ( AVPicture * )&frame )->linesize[ 0 ];
 582                                         U += ( ( AVPicture * )&frame )->linesize[ 1 ];
 583                                         V += ( ( AVPicture * )&frame )->linesize[ 2 ];
 584                                 }
 585                         }
 586                         else
 587                         {
 588                                 img_convert( output, PIX_FMT_YUV422, (AVPicture *)&frame, codec_context->pix_fmt, *width, *height );
 589                                 memcpy( *buffer, output->data[ 0 ], size );
 590                         }
 591
 592                         memcpy( image, *buffer, size );
 593                         mlt_properties_set_data( frame_properties, "image", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
 594
 595                         if ( current_time == 0 && source_fps != 0 )
 596                         {
 597                                 double fps = mlt_properties_get_double( properties, "fps" );
 598                                 current_time = ceil( source_fps * ( double )position / fps ) * ( 1 / source_fps );
 599                                 mlt_properties_set_double( properties, "current_time", current_time );
 600                         }
 601                         else
 602                         {
 603                                 mlt_properties_set_double( properties, "current_time", current_time );
 604                         }
 605                 }
 606         }
 607
 608         // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
 609         mlt_properties_set_position( properties, "video_expected", position + 1 );
 610
 611         // Unlock the mutex now
 612         pthread_mutex_unlock( &avformat_mutex );
 613
 614         return 0;
 615 }
 616
 617 /** Set up video handling.
 618 */
 619
 620 static void producer_set_up_video( mlt_producer this, mlt_frame frame )
 621 {
 622         // Get the properties
 623         mlt_properties properties = mlt_producer_properties( this );
 624
 625         // Fetch the video_context
 626         AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
 627
 628         // Get the video_index
 629         int index = mlt_properties_get_int( properties, "video_index" );
 630
 631         // Get the frame properties
 632         mlt_properties frame_properties = mlt_frame_properties( frame );
 633
 634         // Lock the mutex now
 635         pthread_mutex_lock( &avformat_mutex );
 636
 637         if ( context != NULL && index != -1 )
 638         {
 639                 // Get the video stream
 640                 AVStream *stream = context->streams[ index ];
 641
 642                 // Get codec context
 643                 AVCodecContext *codec_context = &stream->codec;
 644
 645                 // Get the codec
 646                 AVCodec *codec = mlt_properties_get_data( properties, "video_codec", NULL );
 647
 648                 // Initialise the codec if necessary
 649                 if ( codec == NULL )
 650                 {
 651                         // Find the codec
 652                         codec = avcodec_find_decoder( codec_context->codec_id );
 653
 654                         // If we don't have a codec and we can't initialise it, we can't do much more...
 655                         if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
 656                         {
 657                                 // Now store the codec with its destructor
 658                                 mlt_properties_set_data( properties, "video_codec", codec_context, 0, producer_codec_close, NULL );
 659                         }
 660                         else
 661                         {
 662                                 // Remember that we can't use this later
 663                                 mlt_properties_set_int( properties, "video_index", -1 );
 664                         }
 665                 }
 666
 667                 // No codec, no show...
 668                 if ( codec != NULL )
 669                 {
 670                         double aspect_ratio = 1;
 671                         double source_fps = 0;
 672
 673                         // Set aspect ratio
 674                         if ( codec_context->sample_aspect_ratio.num > 0 )
 675                                 aspect_ratio = av_q2d( codec_context->sample_aspect_ratio );
 676
 677                         mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
 678                         //fprintf( stderr, "AVFORMAT: sample aspect %f %dx%d\n", av_q2d( codec_context->sample_aspect_ratio ), codec_context->width, codec_context->height );
 679
 680                         // Determine the fps
 681                         source_fps = ( double )codec_context->frame_rate / ( codec_context->frame_rate_base == 0 ? 1 : codec_context->frame_rate_base );
 682
 683                         // We'll use fps if it's available
 684                         if ( source_fps > 0 && source_fps < 30 )
 685                                 mlt_properties_set_double( properties, "source_fps", source_fps );
 686
 687                         // Set the width and height
 688                         mlt_properties_set_int( frame_properties, "width", codec_context->width );
 689                         mlt_properties_set_int( frame_properties, "height", codec_context->height );
 690
 691                         mlt_frame_push_get_image( frame, producer_get_image );
 692                         mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
 693                 }
 694                 else
 695                 {
 696                         mlt_properties_set_int( frame_properties, "test_image", 1 );
 697                 }
 698         }
 699         else
 700         {
 701                 mlt_properties_set_int( frame_properties, "test_image", 1 );
 702         }
 703
 704         // Unlock the mutex now
 705         pthread_mutex_unlock( &avformat_mutex );
 706 }
 707
 708 /** Get the audio from a frame.
 709 */
 710
 711 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 712 {
 713         // Get the properties from the frame
 714         mlt_properties frame_properties = mlt_frame_properties( frame );
 715
 716         // Obtain the frame number of this frame
 717         mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
 718
 719         // Get the producer
 720         mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
 721
 722         // Get the producer properties
 723         mlt_properties properties = mlt_producer_properties( this );
 724
 725         // Fetch the audio_context
 726         AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
 727
 728         // Get the audio_index
 729         int index = mlt_properties_get_int( properties, "audio_index" );
 730
 731         // Obtain the expected frame numer
 732         mlt_position expected = mlt_properties_get_position( properties, "audio_expected" );
 733
 734         // Obtain the resample context if it exists (not always needed)
 735         ReSampleContext *resample = mlt_properties_get_data( properties, "audio_resample", NULL );
 736
 737         // Obtain the audio buffer
 738         int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
 739
 740         // Get amount of audio used
 741         int audio_used =  mlt_properties_get_int( properties, "audio_used" );
 742
 743         // Calculate the real time code
 744         double real_timecode = producer_time_of_frame( this, position );
 745
 746         // Get the audio stream
 747         AVStream *stream = context->streams[ index ];
 748
 749         // Get codec context
 750         AVCodecContext *codec_context = &stream->codec;
 751
 752         // Packet
 753         AVPacket pkt;
 754
 755         // Number of frames to ignore (for ffwd)
 756         int ignore = 0;
 757
 758         // Flag for paused (silence)
 759         int paused = 0;
 760         int locked = 0;
 761
 762         // Lock the mutex now
 763         pthread_mutex_lock( &avformat_mutex );
 764
 765         // Check for resample and create if necessary
 766         if ( resample == NULL )
 767         {
 768                 // Create the resampler
 769                 resample = audio_resample_init( *channels, codec_context->channels, *frequency, codec_context->sample_rate );
 770
 771                 // And store it on properties
 772                 mlt_properties_set_data( properties, "audio_resample", resample, 0, ( mlt_destructor )audio_resample_close, NULL );
 773         }
 774
 775         // Check for audio buffer and create if necessary
 776         if ( audio_buffer == NULL )
 777         {
 778                 // Allocate the audio buffer
 779                 audio_buffer = mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
 780
 781                 // And store it on properties for reuse
 782                 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
 783         }
 784
 785         // Seek if necessary
 786         if ( position != expected )
 787         {
 788                 if ( position + 1 == expected )
 789                 {
 790                         // We're paused - silence required
 791                         paused = 1;
 792                 }
 793                 else if ( position > expected && ( position - expected ) < 250 )
 794                 {
 795                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
 796                         ignore = position - expected;
 797                 }
 798                 else
 799                 {
 800                         // Set to the real timecode
 801                         av_seek_frame( context, -1, real_timecode * 1000000.0 );
 802
 803                         // Clear the usage in the audio buffer
 804                         audio_used = 0;
 805
 806                         locked = 1;
 807                 }
 808         }
 809
 810         // Get the audio if required
 811         if ( !paused )
 812         {
 813                 int ret = 0;
 814                 int got_audio = 0;
 815                 int16_t *temp = mlt_pool_alloc( sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE );
 816
 817                 memset( &pkt, 0, sizeof( pkt ) );
 818
 819                 while( ret >= 0 && !got_audio )
 820                 {
 821                         // Check if the buffer already contains the samples required
 822                         if ( audio_used >= *samples && ignore == 0 )
 823                         {
 824                                 got_audio = 1;
 825                                 break;
 826                         }
 827
 828                         // Read a packet
 829                         ret = av_read_frame( context, &pkt );
 830
 831                 int len = pkt.size;
 832                 uint8_t *ptr = pkt.data;
 833                         int data_size;
 834
 835                         // We only deal with video from the selected video_index
 836                         while ( ptr != NULL && ret >= 0 && pkt.stream_index == index && len > 0 )
 837                         {
 838                                 // Decode the audio
 839                                 ret = avcodec_decode_audio( codec_context, temp, &data_size, ptr, len );
 840
 841                                 if ( ret < 0 )
 842                                 {
 843                                         ret = 0;
 844                                         break;
 845                                 }
 846
 847                                 len -= ret;
 848                                 ptr += ret;
 849
 850                                 if ( data_size > 0 )
 851                                 {
 852                                         int size_out = audio_resample( resample, &audio_buffer[ audio_used * *channels ], temp, data_size / ( codec_context->channels * sizeof( int16_t ) ) );
 853
 854                                         audio_used += size_out;
 855
 856                                         // Handle ignore
 857                                         while ( ignore && audio_used > *samples )
 858                                         {
 859                                                 ignore --;
 860                                                 audio_used -= *samples;
 861                                                 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
 862                                         }
 863                                 }
 864
 865                                 // If we're behind, ignore this packet
 866                                 float current_pts = (float)pkt.pts / 1000000.0;
 867                                 double discrepancy = mlt_properties_get_double( properties, "discrepancy" );
 868                                 if ( current_pts != 0 && real_timecode != 0 )
 869                                 {
 870                                         if ( discrepancy != 1 )
 871                                                 discrepancy = ( discrepancy + ( real_timecode / current_pts ) ) / 2;
 872                                         else
 873                                                 discrepancy = real_timecode / current_pts;
 874                                         if ( discrepancy > 0.9 && discrepancy < 1.1 )
 875                                                 discrepancy = 1.0;
 876                                         else
 877                                                 discrepancy = floor( discrepancy + 0.5 );
 878
 879                                         if ( discrepancy == 0 )
 880                                                 discrepancy = 1.0;
 881
 882                                         mlt_properties_set_double( properties, "discrepancy", discrepancy );
 883                                 }
 884
 885                                 if ( !ignore && discrepancy * current_pts <= ( real_timecode - 0.02 ) )
 886                                         ignore = 1;
 887                         }
 888
 889                         // We're finished with this packet regardless
 890                         av_free_packet( &pkt );
 891                 }
 892
 893                 *buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
 894                 mlt_properties_set_data( frame_properties, "audio", *buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
 895
 896                 // Now handle the audio if we have enough
 897                 if ( audio_used >= *samples )
 898                 {
 899                         memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
 900                         audio_used -= *samples;
 901                         memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
 902                 }
 903                 else
 904                 {
 905                         memset( *buffer, 0, *samples * *channels * sizeof( int16_t ) );
 906                 }
 907
 908                 // Store the number of audio samples still available
 909                 mlt_properties_set_int( properties, "audio_used", audio_used );
 910
 911                 // Release the temporary audio
 912                 mlt_pool_release( temp );
 913         }
 914         else
 915         {
 916                 // Get silence and don't touch the context
 917                 frame->get_audio = NULL;
 918                 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
 919         }
 920
 921         // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
 922         mlt_properties_set_position( properties, "audio_expected", position + 1 );
 923
 924         // Unlock the mutex now
 925         pthread_mutex_unlock( &avformat_mutex );
 926
 927         return 0;
 928 }
 929
 930 /** Set up audio handling.
 931 */
 932
 933 static void producer_set_up_audio( mlt_producer this, mlt_frame frame )
 934 {
 935         // Get the properties
 936         mlt_properties properties = mlt_producer_properties( this );
 937
 938         // Fetch the audio_context
 939         AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
 940
 941         // Get the audio_index
 942         int index = mlt_properties_get_int( properties, "audio_index" );
 943
 944         // Lock the mutex now
 945         pthread_mutex_lock( &avformat_mutex );
 946
 947         // Deal with audio context
 948         if ( context != NULL && index != -1 )
 949         {
 950                 // Get the frame properties
 951                 mlt_properties frame_properties = mlt_frame_properties( frame );
 952
 953                 // Get the audio stream
 954                 AVStream *stream = context->streams[ index ];
 955
 956                 // Get codec context
 957                 AVCodecContext *codec_context = &stream->codec;
 958
 959                 // Get the codec
 960                 AVCodec *codec = mlt_properties_get_data( properties, "audio_codec", NULL );
 961
 962                 // Initialise the codec if necessary
 963                 if ( codec == NULL )
 964                 {
 965                         // Find the codec
 966                         codec = avcodec_find_decoder( codec_context->codec_id );
 967
 968                         // If we don't have a codec and we can't initialise it, we can't do much more...
 969                         if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
 970                         {
 971                                 // Now store the codec with its destructor
 972                                 mlt_properties_set_data( properties, "audio_codec", codec_context, 0, producer_codec_close, NULL );
 973
 974                         }
 975                         else
 976                         {
 977                                 // Remember that we can't use this later
 978                                 mlt_properties_set_int( properties, "audio_index", -1 );
 979                         }
 980                 }
 981
 982                 // No codec, no show...
 983                 if ( codec != NULL )
 984                 {
 985                         frame->get_audio = producer_get_audio;
 986                         mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
 987                 }
 988         }
 989
 990         // Unlock the mutex now
 991         pthread_mutex_unlock( &avformat_mutex );
 992 }
 993
 994 /** Our get frame implementation.
 995 */
 996
 997 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
 998 {
 999         // Create an empty frame
1000         *frame = mlt_frame_init( );
1001
1002         // Update timecode on the frame we're creating
1003         mlt_frame_set_position( *frame, mlt_producer_position( this ) );
1004
1005         // Set the position of this producer
1006         mlt_properties_set_position( mlt_frame_properties( *frame ), "avformat_position", mlt_producer_get_in( this ) + mlt_producer_position( this ) );
1007
1008         // Set up the video
1009         producer_set_up_video( this, *frame );
1010
1011         // Set up the audio
1012         producer_set_up_audio( this, *frame );
1013
1014         // Set the aspect_ratio
1015         mlt_properties_set_double( mlt_frame_properties( *frame ), "aspect_ratio", mlt_properties_get_double( mlt_producer_properties( this ), "aspect_ratio" ) );
1016
1017         // Calculate the next timecode
1018         mlt_producer_prepare_next( this );
1019
1020         return 0;
1021 }