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

   1 /*
   2  * producer_avformat.c -- avformat producer
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  * Much code borrowed from ffmpeg.c: Copyright (c) 2000-2003 Fabrice Bellard
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 // MLT Header files
  23 #include <framework/mlt_producer.h>
  24 #include <framework/mlt_frame.h>
  25
  26 // ffmpeg Header files
  27 #include <avformat.h>
  28 #ifdef SWSCALE
  29 #include <swscale.h>
  30 #endif
  31
  32 // System header files
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <pthread.h>
  36 #include <math.h>
  37
  38 void avformat_lock( );
  39 void avformat_unlock( );
  40
  41 // Forward references.
  42 static int producer_open( mlt_producer this, mlt_profile profile, char *file );
  43 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
  44
  45 /** Constructor for libavformat.
  46 */
  47
  48 mlt_producer producer_avformat_init( mlt_profile profile, char *file )
  49 {
  50         mlt_producer this = NULL;
  51
  52         // Check that we have a non-NULL argument
  53         if ( file != NULL )
  54         {
  55                 // Construct the producer
  56                 this = calloc( 1, sizeof( struct mlt_producer_s ) );
  57
  58                 // Initialise it
  59                 if ( mlt_producer_init( this, NULL ) == 0 )
  60                 {
  61                         // Get the properties
  62                         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
  63
  64                         // Set the resource property (required for all producers)
  65                         mlt_properties_set( properties, "resource", file );
  66
  67                         // Register our get_frame implementation
  68                         this->get_frame = producer_get_frame;
  69
  70                         // Open the file
  71                         if ( producer_open( this, profile, file ) != 0 )
  72                         {
  73                                 // Clean up
  74                                 mlt_producer_close( this );
  75                                 this = NULL;
  76                         }
  77
  78                         // Close the file to release resources for large playlists - reopen later as needed
  79                         mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
  80                         mlt_properties_set_data( properties, "audio_context", NULL, 0, NULL, NULL );
  81                         mlt_properties_set_data( properties, "video_context", NULL, 0, NULL, NULL );
  82                 }
  83         }
  84
  85         return this;
  86 }
  87
  88 /** Find the default streams.
  89 */
  90
  91 static void find_default_streams( AVFormatContext *context, int *audio_index, int *video_index )
  92 {
  93         int i;
  94
  95         // Allow for multiple audio and video streams in the file and select first of each (if available)
  96         for( i = 0; i < context->nb_streams; i++ )
  97         {
  98                 // Get the codec context
  99                 AVCodecContext *codec_context = context->streams[ i ]->codec;
 100
 101                 if ( avcodec_find_decoder( codec_context->codec_id ) == NULL )
 102                         continue;
 103
 104                 // Determine the type and obtain the first index of each type
 105                 switch( codec_context->codec_type )
 106                 {
 107                         case CODEC_TYPE_VIDEO:
 108                                 if ( *video_index < 0 )
 109                                         *video_index = i;
 110                                 break;
 111                         case CODEC_TYPE_AUDIO:
 112                                 if ( *audio_index < 0 )
 113                                         *audio_index = i;
 114                                 break;
 115                         default:
 116                                 break;
 117                 }
 118         }
 119 }
 120
 121 /** Producer file destructor.
 122 */
 123
 124 static void producer_file_close( void *context )
 125 {
 126         if ( context != NULL )
 127         {
 128                 // Lock the mutex now
 129                 avformat_lock( );
 130
 131                 // Close the file
 132                 av_close_input_file( context );
 133
 134                 // Unlock the mutex now
 135                 avformat_unlock( );
 136         }
 137 }
 138
 139 /** Producer file destructor.
 140 */
 141
 142 static void producer_codec_close( void *codec )
 143 {
 144         if ( codec != NULL )
 145         {
 146                 // Lock the mutex now
 147                 avformat_lock( );
 148
 149                 // Close the file
 150                 avcodec_close( codec );
 151
 152                 // Unlock the mutex now
 153                 avformat_unlock( );
 154         }
 155 }
 156
 157 /** Open the file.
 158 */
 159
 160 static int producer_open( mlt_producer this, mlt_profile profile, char *file )
 161 {
 162         // Return an error code (0 == no error)
 163         int error = 0;
 164
 165         // Context for avformat
 166         AVFormatContext *context = NULL;
 167
 168         // Get the properties
 169         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 170
 171         // We will treat everything with the producer fps
 172         double fps = mlt_profile_fps( profile );
 173
 174         // Lock the mutex now
 175         avformat_lock( );
 176
 177         // If "MRL", then create AVInputFormat
 178         AVInputFormat *format = NULL;
 179         AVFormatParameters *params = NULL;
 180         char *standard = NULL;
 181         char *mrl = strchr( file, ':' );
 182
 183         // AV option (0 = both, 1 = video, 2 = audio)
 184         int av = 0;
 185
 186         // Setting lowest log level
 187         av_log_set_level( -1 );
 188
 189         // Only if there is not a protocol specification that avformat can handle
 190         if ( mrl && !url_exist( file ) )
 191         {
 192                 // 'file' becomes format abbreviation
 193                 mrl[0] = 0;
 194
 195                 // Lookup the format
 196                 format = av_find_input_format( file );
 197
 198                 // Eat the format designator
 199                 file = ++mrl;
 200
 201                 if ( format )
 202                 {
 203                         // Allocate params
 204                         params = calloc( sizeof( AVFormatParameters ), 1 );
 205
 206                         // These are required by video4linux (defaults)
 207                         params->width = 640;
 208                         params->height = 480;
 209                         params->time_base= (AVRational){1,25};
 210                         // params->device = file;
 211                         params->channels = 2;
 212                         params->sample_rate = 48000;
 213                 }
 214
 215                 // XXX: this does not work anymore since avdevice
 216                 // TODO: make producer_avddevice?
 217                 // Parse out params
 218                 mrl = strchr( file, '?' );
 219                 while ( mrl )
 220                 {
 221                         mrl[0] = 0;
 222                         char *name = strdup( ++mrl );
 223                         char *value = strchr( name, ':' );
 224                         if ( value )
 225                         {
 226                                 value[0] = 0;
 227                                 value++;
 228                                 char *t = strchr( value, '&' );
 229                                 if ( t )
 230                                         t[0] = 0;
 231                                 if ( !strcmp( name, "frame_rate" ) )
 232                                         params->time_base.den = atoi( value );
 233                                 else if ( !strcmp( name, "frame_rate_base" ) )
 234                                         params->time_base.num = atoi( value );
 235                                 else if ( !strcmp( name, "sample_rate" ) )
 236                                         params->sample_rate = atoi( value );
 237                                 else if ( !strcmp( name, "channels" ) )
 238                                         params->channels = atoi( value );
 239                                 else if ( !strcmp( name, "width" ) )
 240                                         params->width = atoi( value );
 241                                 else if ( !strcmp( name, "height" ) )
 242                                         params->height = atoi( value );
 243                                 else if ( !strcmp( name, "standard" ) )
 244                                 {
 245                                         standard = strdup( value );
 246                                         params->standard = standard;
 247                                 }
 248                                 else if ( !strcmp( name, "av" ) )
 249                                         av = atoi( value );
 250                         }
 251                         free( name );
 252                         mrl = strchr( mrl, '&' );
 253                 }
 254         }
 255
 256         // Now attempt to open the file
 257         error = av_open_input_file( &context, file, format, 0, params ) < 0;
 258
 259         // Cleanup AVFormatParameters
 260         free( standard );
 261         free( params );
 262
 263         // If successful, then try to get additional info
 264         if ( error == 0 )
 265         {
 266                 // Get the stream info
 267                 error = av_find_stream_info( context ) < 0;
 268
 269                 // Continue if no error
 270                 if ( error == 0 )
 271                 {
 272                         // We will default to the first audio and video streams found
 273                         int audio_index = -1;
 274                         int video_index = -1;
 275                         int av_bypass = 0;
 276
 277                         // Now set properties where we can (use default unknowns if required)
 278                         if ( context->duration != AV_NOPTS_VALUE )
 279                         {
 280                                 // This isn't going to be accurate for all formats
 281                                 mlt_position frames = ( mlt_position )( ( ( double )context->duration / ( double )AV_TIME_BASE ) * fps + 0.5 );
 282                                 mlt_properties_set_position( properties, "out", frames - 1 );
 283                                 mlt_properties_set_position( properties, "length", frames );
 284                         }
 285
 286                         // Find default audio and video streams
 287                         find_default_streams( context, &audio_index, &video_index );
 288
 289                         if ( context->start_time != AV_NOPTS_VALUE )
 290                                 mlt_properties_set_double( properties, "_start_time", context->start_time );
 291
 292                         // Check if we're seekable (something funny about mpeg here :-/)
 293                         if ( strcmp( file, "pipe:" ) && strncmp( file, "http://", 6 ) )
 294                         {
 295                                 mlt_properties_set_int( properties, "seekable", av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ), AVSEEK_FLAG_BACKWARD ) >= 0 );
 296                                 mlt_properties_set_data( properties, "dummy_context", context, 0, producer_file_close, NULL );
 297                                 av_open_input_file( &context, file, NULL, 0, NULL );
 298                                 av_find_stream_info( context );
 299                         }
 300                         else
 301                                 av_bypass = 1;
 302
 303                         // Store selected audio and video indexes on properties
 304                         mlt_properties_set_int( properties, "audio_index", audio_index );
 305                         mlt_properties_set_int( properties, "video_index", video_index );
 306                         mlt_properties_set_int( properties, "_last_position", -1 );
 307
 308                         // Fetch the width, height and aspect ratio
 309                         if ( video_index != -1 )
 310                         {
 311                                 AVCodecContext *codec_context = context->streams[ video_index ]->codec;
 312                                 mlt_properties_set_int( properties, "width", codec_context->width );
 313                                 mlt_properties_set_int( properties, "height", codec_context->height );
 314                                 mlt_properties_set_double( properties, "aspect_ratio", av_q2d( codec_context->sample_aspect_ratio ) );
 315                         }
 316
 317                         // Read Metadata
 318                         if (context->title != NULL)
 319                                 mlt_properties_set(properties, "meta.attr.title.markup", context->title );
 320                         if (context->author != NULL)
 321                                 mlt_properties_set(properties, "meta.attr.author.markup", context->author );
 322                         if (context->copyright != NULL)
 323                                 mlt_properties_set(properties, "meta.attr.copyright.markup", context->copyright );
 324                         if (context->comment != NULL)
 325                                 mlt_properties_set(properties, "meta.attr.comment.markup", context->comment );
 326                         if (context->album != NULL)
 327                                 mlt_properties_set(properties, "meta.attr.album.markup", context->album );
 328                         if (context->year != 0)
 329                                 mlt_properties_set_int(properties, "meta.attr.year.markup", context->year );
 330                         if (context->track != 0)
 331                                 mlt_properties_set_int(properties, "meta.attr.track.markup", context->track );
 332
 333                         // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
 334                         if ( av == 0 && !av_bypass && audio_index != -1 && video_index != -1 )
 335                         {
 336                                 // We'll use the open one as our video_context
 337                                 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
 338
 339                                 // And open again for our audio context
 340                                 av_open_input_file( &context, file, NULL, 0, NULL );
 341                                 av_find_stream_info( context );
 342
 343                                 // Audio context
 344                                 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
 345                         }
 346                         else if ( av != 2 && video_index != -1 )
 347                         {
 348                                 // We only have a video context
 349                                 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
 350                         }
 351                         else if ( audio_index != -1 )
 352                         {
 353                                 // We only have an audio context
 354                                 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
 355                         }
 356                         else
 357                         {
 358                                 // Something has gone wrong
 359                                 error = -1;
 360                         }
 361
 362                         mlt_properties_set_int( properties, "av_bypass", av_bypass );
 363                 }
 364         }
 365
 366         // Unlock the mutex now
 367         avformat_unlock( );
 368
 369         return error;
 370 }
 371
 372 /** Convert a frame position to a time code.
 373 */
 374
 375 static double producer_time_of_frame( mlt_producer this, mlt_position position )
 376 {
 377         return ( double )position / mlt_producer_get_fps( this );
 378 }
 379
 380 static inline void convert_image( AVFrame *frame, uint8_t *buffer, int pix_fmt, mlt_image_format format, int width, int height )
 381 {
 382 #ifdef SWSCALE
 383         if ( format == mlt_image_yuv420p )
 384         {
 385                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 386                         width, height, PIX_FMT_YUV420P, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 387                 AVPicture output;
 388                 output.data[0] = buffer;
 389                 output.data[1] = buffer + width * height;
 390                 output.data[2] = buffer + ( 3 * width * height ) / 2;
 391                 output.linesize[0] = width;
 392                 output.linesize[1] = width >> 1;
 393                 output.linesize[2] = width >> 1;
 394                 sws_scale( context, frame->data, frame->linesize, 0, height,
 395                         output.data, output.linesize);
 396                 sws_freeContext( context );
 397         }
 398         else if ( format == mlt_image_rgb24 )
 399         {
 400                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 401                         width, height, PIX_FMT_RGB24, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 402                 AVPicture output;
 403                 avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
 404                 sws_scale( context, frame->data, frame->linesize, 0, height,
 405                         output.data, output.linesize);
 406                 sws_freeContext( context );
 407         }
 408         else
 409         {
 410                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 411                         width, height, PIX_FMT_YUYV422, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 412                 AVPicture output;
 413                 avpicture_fill( &output, buffer, PIX_FMT_YUYV422, width, height );
 414                 sws_scale( context, frame->data, frame->linesize, 0, height,
 415                         output.data, output.linesize);
 416                 sws_freeContext( context );
 417         }
 418 #else
 419         if ( format == mlt_image_yuv420p )
 420         {
 421                 AVPicture pict;
 422                 pict.data[0] = buffer;
 423                 pict.data[1] = buffer + width * height;
 424                 pict.data[2] = buffer + ( 3 * width * height ) / 2;
 425                 pict.linesize[0] = width;
 426                 pict.linesize[1] = width >> 1;
 427                 pict.linesize[2] = width >> 1;
 428                 img_convert( &pict, PIX_FMT_YUV420P, (AVPicture *)frame, pix_fmt, width, height );
 429         }
 430         else if ( format == mlt_image_rgb24 )
 431         {
 432                 AVPicture output;
 433                 avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
 434                 img_convert( &output, PIX_FMT_RGB24, (AVPicture *)frame, pix_fmt, width, height );
 435         }
 436         else
 437         {
 438                 AVPicture output;
 439                 avpicture_fill( &output, buffer, PIX_FMT_YUV422, width, height );
 440                 img_convert( &output, PIX_FMT_YUV422, (AVPicture *)frame, pix_fmt, width, height );
 441         }
 442 #endif
 443 }
 444
 445 /** Get an image from a frame.
 446 */
 447
 448 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 449 {
 450         // Get the properties from the frame
 451         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 452
 453         // Obtain the frame number of this frame
 454         mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
 455
 456         // Get the producer
 457         mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
 458
 459         // Get the producer properties
 460         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 461
 462         // Fetch the video_context
 463         AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
 464
 465         // Get the video_index
 466         int index = mlt_properties_get_int( properties, "video_index" );
 467
 468         // Obtain the expected frame numer
 469         mlt_position expected = mlt_properties_get_position( properties, "_video_expected" );
 470
 471         // Get the video stream
 472         AVStream *stream = context->streams[ index ];
 473
 474         // Get codec context
 475         AVCodecContext *codec_context = stream->codec;
 476
 477         // Packet
 478         AVPacket pkt;
 479
 480         // Get the conversion frame
 481         AVFrame *av_frame = mlt_properties_get_data( properties, "av_frame", NULL );
 482
 483         // Special case pause handling flag
 484         int paused = 0;
 485
 486         // Special case ffwd handling
 487         int ignore = 0;
 488
 489         // We may want to use the source fps if available
 490         double source_fps = mlt_properties_get_double( properties, "source_fps" );
 491         double fps = mlt_producer_get_fps( this );
 492
 493         // This is the physical frame position in the source
 494         int req_position = ( int )( position / fps * source_fps + 0.5 );
 495
 496         // Get the seekable status
 497         int seekable = mlt_properties_get_int( properties, "seekable" );
 498
 499         // Generate the size in bytes
 500         int size = 0;
 501
 502         // Hopefully provide better support for streams...
 503         int av_bypass = mlt_properties_get_int( properties, "av_bypass" );
 504
 505         // Determines if we have to decode all frames in a sequence
 506         int must_decode = 1;
 507
 508         // Set the result arguments that we know here (only *buffer is now required)
 509         *width = codec_context->width;
 510         *height = codec_context->height;
 511
 512         switch ( *format )
 513         {
 514                 case mlt_image_yuv420p:
 515                         size = *width * 3 * ( *height + 1 ) / 2;
 516                         break;
 517                 case mlt_image_rgb24:
 518                         size = *width * ( *height + 1 ) * 3;
 519                         break;
 520                 default:
 521                         *format = mlt_image_yuv422;
 522                         size = *width * ( *height + 1 ) * 2;
 523                         break;
 524         }
 525
 526         // Set this on the frame properties
 527         mlt_properties_set_int( frame_properties, "width", *width );
 528         mlt_properties_set_int( frame_properties, "height", *height );
 529
 530         // Construct the output image
 531         *buffer = mlt_pool_alloc( size );
 532
 533         // Temporary hack to improve intra frame only
 534         must_decode = strcmp( codec_context->codec->name, "mjpeg" ) &&
 535                                   strcmp( codec_context->codec->name, "rawvideo" ) &&
 536                                   strcmp( codec_context->codec->name, "dvvideo" );
 537
 538         // Seek if necessary
 539         if ( position != expected )
 540         {
 541                 if ( av_frame != NULL && position + 1 == expected )
 542                 {
 543                         // We're paused - use last image
 544                         paused = 1;
 545                 }
 546                 else if ( !seekable && position > expected && ( position - expected ) < 250 )
 547                 {
 548                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
 549                         ignore = ( int )( ( position - expected ) / fps * source_fps );
 550                 }
 551                 else if ( seekable && ( position < expected || position - expected >= 12 ) )
 552                 {
 553                         // Calculate the timestamp for the requested frame
 554                         int64_t timestamp = ( int64_t )( ( double )req_position / source_fps * AV_TIME_BASE + 0.5 );
 555                         if ( ( uint64_t )context->start_time != AV_NOPTS_VALUE )
 556                                 timestamp += context->start_time;
 557                         if ( must_decode )
 558                                 timestamp -= AV_TIME_BASE;
 559                         if ( timestamp < 0 )
 560                                 timestamp = 0;
 561
 562                         // Set to the timestamp
 563                         av_seek_frame( context, -1, timestamp, AVSEEK_FLAG_BACKWARD );
 564
 565                         // Remove the cached info relating to the previous position
 566                         mlt_properties_set_int( properties, "_current_position", -1 );
 567                         mlt_properties_set_int( properties, "_last_position", -1 );
 568                         mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
 569                         av_frame = NULL;
 570                 }
 571         }
 572
 573         // Duplicate the last image if necessary (see comment on rawvideo below)
 574         int current_position = mlt_properties_get_int( properties, "_current_position" );
 575         int got_picture = mlt_properties_get_int( properties, "_got_picture" );
 576         if ( av_frame != NULL && got_picture && ( paused || current_position >= req_position ) && av_bypass == 0 )
 577         {
 578                 // Duplicate it
 579                 convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
 580
 581                 // Set this on the frame properties
 582                 mlt_properties_set_data( frame_properties, "image", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
 583         }
 584         else
 585         {
 586                 int ret = 0;
 587                 int int_position = 0;
 588                 got_picture = 0;
 589
 590                 av_init_packet( &pkt );
 591
 592                 // Construct an AVFrame for YUV422 conversion
 593                 if ( av_frame == NULL )
 594                 {
 595                         av_frame = avcodec_alloc_frame( );
 596                         mlt_properties_set_data( properties, "av_frame", av_frame, 0, av_free, NULL );
 597                 }
 598
 599                 while( ret >= 0 && !got_picture )
 600                 {
 601                         // Read a packet
 602                         ret = av_read_frame( context, &pkt );
 603
 604                         // We only deal with video from the selected video_index
 605                         if ( ret >= 0 && pkt.stream_index == index && pkt.size > 0 )
 606                         {
 607                                 // Determine time code of the packet
 608                                 int_position = ( int )( av_q2d( stream->time_base ) * pkt.dts * source_fps + 0.5 );
 609                                 if ( context->start_time != AV_NOPTS_VALUE )
 610                                         int_position -= ( int )( context->start_time * source_fps / AV_TIME_BASE + 0.5 );
 611                                 int last_position = mlt_properties_get_int( properties, "_last_position" );
 612                                 if ( int_position == last_position )
 613                                         int_position = last_position + 1;
 614                                 mlt_properties_set_int( properties, "_last_position", int_position );
 615
 616                                 // Decode the image
 617                                 if ( must_decode || int_position >= req_position )
 618                                         ret = avcodec_decode_video( codec_context, av_frame, &got_picture, pkt.data, pkt.size );
 619
 620                                 if ( got_picture )
 621                                 {
 622                                         // Handle ignore
 623                                         if ( int_position < req_position )
 624                                         {
 625                                                 ignore = 0;
 626                                                 got_picture = 0;
 627                                         }
 628                                         else if ( int_position >= req_position )
 629                                         {
 630                                                 ignore = 0;
 631                                         }
 632                                         else if ( ignore -- )
 633                                         {
 634                                                 got_picture = 0;
 635                                         }
 636                                 }
 637                                 av_free_packet( &pkt );
 638                         }
 639                         else if ( ret >= 0 )
 640                         {
 641                                 av_free_packet( &pkt );
 642                         }
 643
 644                         // Now handle the picture if we have one
 645                         if ( got_picture )
 646                         {
 647                                 mlt_properties_set_int( frame_properties, "progressive", !av_frame->interlaced_frame );
 648                                 mlt_properties_set_int( properties, "top_field_first", av_frame->top_field_first );
 649                                 convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
 650                                 mlt_properties_set_data( frame_properties, "image", *buffer, size, (mlt_destructor)mlt_pool_release, NULL );
 651                                 mlt_properties_set_int( properties, "_current_position", int_position );
 652                                 mlt_properties_set_int( properties, "_got_picture", 1 );
 653                         }
 654                 }
 655         }
 656
 657         // Very untidy - for rawvideo, the packet contains the frame, hence the free packet
 658         // above will break the pause behaviour - so we wipe the frame now
 659         if ( !strcmp( codec_context->codec->name, "rawvideo" ) )
 660                 mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
 661
 662         // Set the field order property for this frame
 663         mlt_properties_set_int( frame_properties, "top_field_first", mlt_properties_get_int( properties, "top_field_first" ) );
 664
 665         // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
 666         mlt_properties_set_position( properties, "_video_expected", position + 1 );
 667
 668         return 0;
 669 }
 670
 671 /** Set up video handling.
 672 */
 673
 674 static void producer_set_up_video( mlt_producer this, mlt_frame frame )
 675 {
 676         // Get the properties
 677         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 678
 679         // Fetch the video_context
 680         AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
 681         if ( !context )
 682         {
 683                 // Reopen the file
 684                 mlt_events_block( properties, this );
 685                 producer_open( this, mlt_service_profile( MLT_PRODUCER_SERVICE(this) ),
 686                         mlt_properties_get( properties, "resource" ) );
 687                 context = mlt_properties_get_data( properties, "video_context", NULL );
 688                 mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
 689                 mlt_events_unblock( properties, this );
 690         }
 691
 692         // Get the video_index
 693         int index = mlt_properties_get_int( properties, "video_index" );
 694
 695         // Get the frame properties
 696         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 697
 698         if ( context != NULL && index != -1 )
 699         {
 700                 // Get the video stream
 701                 AVStream *stream = context->streams[ index ];
 702
 703                 // Get codec context
 704                 AVCodecContext *codec_context = stream->codec;
 705
 706                 // Get the codec
 707                 AVCodec *codec = mlt_properties_get_data( properties, "video_codec", NULL );
 708
 709                 // Initialise the codec if necessary
 710                 if ( codec == NULL )
 711                 {
 712                         // Initialise multi-threading
 713                         int thread_count = mlt_properties_get_int( properties, "threads" );
 714                         if ( thread_count == 0 && getenv( "MLT_AVFORMAT_THREADS" ) )
 715                                 thread_count = atoi( getenv( "MLT_AVFORMAT_THREADS" ) );
 716                         if ( thread_count > 1 )
 717                         {
 718                                 avcodec_thread_init( codec_context, thread_count );
 719                                 codec_context->thread_count = thread_count;
 720                         }
 721
 722                         // Find the codec
 723                         codec = avcodec_find_decoder( codec_context->codec_id );
 724
 725                         // If we don't have a codec and we can't initialise it, we can't do much more...
 726                         avformat_lock( );
 727                         if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
 728                         {
 729                                 // Now store the codec with its destructor
 730                                 mlt_properties_set_data( properties, "video_codec", codec_context, 0, producer_codec_close, NULL );
 731                         }
 732                         else
 733                         {
 734                                 // Remember that we can't use this later
 735                                 mlt_properties_set_int( properties, "video_index", -1 );
 736                         }
 737                         avformat_unlock( );
 738                 }
 739
 740                 // No codec, no show...
 741                 if ( codec != NULL )
 742                 {
 743                         double source_fps = 0;
 744                         int norm_aspect_ratio = mlt_properties_get_int( properties, "norm_aspect_ratio" );
 745                         double force_aspect_ratio = mlt_properties_get_double( properties, "force_aspect_ratio" );
 746                         double aspect_ratio;
 747
 748                         if ( strcmp( codec_context->codec->name, "dvvideo" ) == 0 )
 749                         {
 750                                 // Override FFmpeg's notion of DV aspect ratios, which are
 751                                 // based upon a width of 704. Since we do not have a normaliser
 752                                 // that crops (nor is cropping 720 wide ITU-R 601 video always desirable)
 753                                 // we just coerce the values to facilitate a passive behaviour through
 754                                 // the rescale normaliser when using equivalent producers and consumers.
 755                                 // = display_aspect / (width * height)
 756                                 if ( codec_context->sample_aspect_ratio.num == 10 &&
 757                                         codec_context->sample_aspect_ratio.den == 11 )
 758                                         force_aspect_ratio = 8.0/9.0; // 4:3 NTSC
 759                                 else if ( codec_context->sample_aspect_ratio.num == 59 &&
 760                                         codec_context->sample_aspect_ratio.den == 54 )
 761                                         force_aspect_ratio = 16.0/15.0; // 4:3 PAL
 762                                 else if ( codec_context->sample_aspect_ratio.num == 40 &&
 763                                         codec_context->sample_aspect_ratio.den == 33 )
 764                                         force_aspect_ratio = 32.0/27.0; // 16:9 NTSC
 765                                 else if ( codec_context->sample_aspect_ratio.num == 118 &&
 766                                         codec_context->sample_aspect_ratio.den == 81 )
 767                                         force_aspect_ratio = 64.0/45.0; // 16:9 PAL
 768                         }
 769
 770                         // XXX: We won't know the real aspect ratio until an image is decoded
 771                         // but we do need it now (to satisfy filter_resize) - take a guess based
 772                         // on pal/ntsc
 773                         if ( force_aspect_ratio > 0.0 )
 774                         {
 775                                 aspect_ratio = force_aspect_ratio;
 776                         }
 777                         else if ( !norm_aspect_ratio && codec_context->sample_aspect_ratio.num > 0 )
 778                         {
 779                                 aspect_ratio = av_q2d( codec_context->sample_aspect_ratio );
 780                         }
 781                         else
 782                         {
 783                                 aspect_ratio = 1.0;
 784                         }
 785
 786                         // Determine the fps
 787                         source_fps = ( double )codec_context->time_base.den / ( codec_context->time_base.num == 0 ? 1 : codec_context->time_base.num );
 788
 789                         // We'll use fps if it's available
 790                         if ( source_fps > 0 )
 791                                 mlt_properties_set_double( properties, "source_fps", source_fps );
 792                         else
 793                                 mlt_properties_set_double( properties, "source_fps", mlt_producer_get_fps( this ) );
 794                         mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
 795
 796                         // Set the width and height
 797                         mlt_properties_set_int( frame_properties, "width", codec_context->width );
 798                         mlt_properties_set_int( frame_properties, "height", codec_context->height );
 799                         mlt_properties_set_double( frame_properties, "aspect_ratio", aspect_ratio );
 800
 801                         mlt_frame_push_get_image( frame, producer_get_image );
 802                         mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
 803                 }
 804                 else
 805                 {
 806                         mlt_properties_set_int( frame_properties, "test_image", 1 );
 807                 }
 808         }
 809         else
 810         {
 811                 mlt_properties_set_int( frame_properties, "test_image", 1 );
 812         }
 813 }
 814
 815 /** Get the audio from a frame.
 816 */
 817
 818 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 819 {
 820         // Get the properties from the frame
 821         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 822
 823         // Obtain the frame number of this frame
 824         mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
 825
 826         // Get the producer
 827         mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
 828
 829         // Get the producer properties
 830         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 831
 832         // Fetch the audio_context
 833         AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
 834
 835         // Get the audio_index
 836         int index = mlt_properties_get_int( properties, "audio_index" );
 837
 838         // Get the seekable status
 839         int seekable = mlt_properties_get_int( properties, "seekable" );
 840
 841         // Obtain the expected frame numer
 842         mlt_position expected = mlt_properties_get_position( properties, "_audio_expected" );
 843
 844         // Obtain the resample context if it exists (not always needed)
 845         ReSampleContext *resample = mlt_properties_get_data( properties, "audio_resample", NULL );
 846
 847         // Obtain the audio buffer
 848         int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
 849
 850         // Get amount of audio used
 851         int audio_used =  mlt_properties_get_int( properties, "_audio_used" );
 852
 853         // Calculate the real time code
 854         double real_timecode = producer_time_of_frame( this, position );
 855
 856         // Get the audio stream
 857         AVStream *stream = context->streams[ index ];
 858
 859         // Get codec context
 860         AVCodecContext *codec_context = stream->codec;
 861
 862         // Packet
 863         AVPacket pkt;
 864
 865         // Number of frames to ignore (for ffwd)
 866         int ignore = 0;
 867
 868         // Flag for paused (silence)
 869         int paused = 0;
 870
 871         // Check for resample and create if necessary
 872         if ( resample == NULL && codec_context->channels <= 2 )
 873         {
 874                 // Create the resampler
 875                 resample = audio_resample_init( *channels, codec_context->channels, *frequency, codec_context->sample_rate );
 876
 877                 // And store it on properties
 878                 mlt_properties_set_data( properties, "audio_resample", resample, 0, ( mlt_destructor )audio_resample_close, NULL );
 879         }
 880         else if ( resample == NULL )
 881         {
 882                 *channels = codec_context->channels;
 883                 *frequency = codec_context->sample_rate;
 884         }
 885
 886         // Check for audio buffer and create if necessary
 887         if ( audio_buffer == NULL )
 888         {
 889                 // Allocate the audio buffer
 890                 audio_buffer = mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
 891
 892                 // And store it on properties for reuse
 893                 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
 894         }
 895
 896         // Seek if necessary
 897         if ( position != expected )
 898         {
 899                 if ( position + 1 == expected )
 900                 {
 901                         // We're paused - silence required
 902                         paused = 1;
 903                 }
 904                 else if ( !seekable && position > expected && ( position - expected ) < 250 )
 905                 {
 906                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
 907                         ignore = position - expected;
 908                 }
 909                 else if ( position < expected || position - expected >= 12 )
 910                 {
 911                         // Set to the real timecode
 912                         if ( av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ) + real_timecode * 1000000.0, AVSEEK_FLAG_BACKWARD ) != 0 )
 913                                 paused = 1;
 914
 915                         // Clear the usage in the audio buffer
 916                         audio_used = 0;
 917                 }
 918         }
 919
 920         // Get the audio if required
 921         if ( !paused )
 922         {
 923                 int ret = 0;
 924                 int got_audio = 0;
 925                 int16_t *temp = av_malloc( sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE );
 926
 927                 av_init_packet( &pkt );
 928
 929                 while( ret >= 0 && !got_audio )
 930                 {
 931                         // Check if the buffer already contains the samples required
 932                         if ( audio_used >= *samples && ignore == 0 )
 933                         {
 934                                 got_audio = 1;
 935                                 break;
 936                         }
 937
 938                         // Read a packet
 939                         ret = av_read_frame( context, &pkt );
 940
 941                         int len = pkt.size;
 942                         uint8_t *ptr = pkt.data;
 943
 944                         // We only deal with audio from the selected audio_index
 945                         while ( ptr != NULL && ret >= 0 && pkt.stream_index == index && len > 0 )
 946                         {
 947                                 int data_size = sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE;
 948
 949                                 // Decode the audio
 950 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(29<<8)+0))
 951                                 ret = avcodec_decode_audio2( codec_context, temp, &data_size, ptr, len );
 952 #else
 953                                 ret = avcodec_decode_audio( codec_context, temp, &data_size, ptr, len );
 954 #endif
 955                                 if ( ret < 0 )
 956                                 {
 957                                         ret = 0;
 958                                         break;
 959                                 }
 960
 961                                 len -= ret;
 962                                 ptr += ret;
 963
 964                                 if ( data_size > 0 )
 965                                 {
 966                                         if ( resample != NULL )
 967                                         {
 968                                                 audio_used += audio_resample( resample, &audio_buffer[ audio_used * *channels ], temp, data_size / ( codec_context->channels * sizeof( int16_t ) ) );
 969                                         }
 970                                         else
 971                                         {
 972                                                 memcpy( &audio_buffer[ audio_used * *channels ], temp, data_size );
 973                                                 audio_used += data_size / ( codec_context->channels * sizeof( int16_t ) );
 974                                         }
 975
 976                                         // Handle ignore
 977                                         while ( ignore && audio_used > *samples )
 978                                         {
 979                                                 ignore --;
 980                                                 audio_used -= *samples;
 981                                                 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
 982                                         }
 983                                 }
 984
 985                                 // If we're behind, ignore this packet
 986                                 float current_pts = av_q2d( stream->time_base ) * pkt.pts;
 987                                 if ( seekable && ( !ignore && current_pts <= ( real_timecode - 0.02 ) ) )
 988                                         ignore = 1;
 989                         }
 990
 991                         // We're finished with this packet regardless
 992                         av_free_packet( &pkt );
 993                 }
 994
 995                 *buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
 996                 mlt_properties_set_data( frame_properties, "audio", *buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
 997
 998                 // Now handle the audio if we have enough
 999                 if ( audio_used >= *samples )
1000                 {
1001                         memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
1002                         audio_used -= *samples;
1003                         memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
1004                 }
1005                 else
1006                 {
1007                         memset( *buffer, 0, *samples * *channels * sizeof( int16_t ) );
1008                 }
1009
1010                 // Store the number of audio samples still available
1011                 mlt_properties_set_int( properties, "_audio_used", audio_used );
1012
1013                 // Release the temporary audio
1014                 av_free( temp );
1015         }
1016         else
1017         {
1018                 // Get silence and don't touch the context
1019                 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
1020         }
1021
1022         // Regardless of speed (other than paused), we expect to get the next frame
1023         if ( !paused )
1024                 mlt_properties_set_position( properties, "_audio_expected", position + 1 );
1025
1026         return 0;
1027 }
1028
1029 /** Set up audio handling.
1030 */
1031
1032 static void producer_set_up_audio( mlt_producer this, mlt_frame frame )
1033 {
1034         // Get the properties
1035         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
1036
1037         // Fetch the audio_context
1038         AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
1039
1040         // Get the audio_index
1041         int index = mlt_properties_get_int( properties, "audio_index" );
1042
1043         // Deal with audio context
1044         if ( context != NULL && index != -1 )
1045         {
1046                 // Get the frame properties
1047                 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
1048
1049                 // Get the audio stream
1050                 AVStream *stream = context->streams[ index ];
1051
1052                 // Get codec context
1053                 AVCodecContext *codec_context = stream->codec;
1054
1055                 // Get the codec
1056                 AVCodec *codec = mlt_properties_get_data( properties, "audio_codec", NULL );
1057
1058                 // Initialise the codec if necessary
1059                 if ( codec == NULL )
1060                 {
1061                         // Find the codec
1062                         codec = avcodec_find_decoder( codec_context->codec_id );
1063
1064                         // If we don't have a codec and we can't initialise it, we can't do much more...
1065                         avformat_lock( );
1066                         if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
1067                         {
1068                                 // Now store the codec with its destructor
1069                                 mlt_properties_set_data( properties, "audio_codec", codec_context, 0, producer_codec_close, NULL );
1070
1071                         }
1072                         else
1073                         {
1074                                 // Remember that we can't use this later
1075                                 mlt_properties_set_int( properties, "audio_index", -1 );
1076                         }
1077                         avformat_unlock( );
1078                 }
1079
1080                 // No codec, no show...
1081                 if ( codec != NULL )
1082                 {
1083                         mlt_frame_push_audio( frame, producer_get_audio );
1084                         mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
1085                         mlt_properties_set_int( frame_properties, "frequency", codec_context->sample_rate );
1086                         mlt_properties_set_int( frame_properties, "channels", codec_context->channels );
1087                 }
1088         }
1089 }
1090
1091 /** Our get frame implementation.
1092 */
1093
1094 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
1095 {
1096         // Create an empty frame
1097         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
1098
1099         // Update timecode on the frame we're creating
1100         mlt_frame_set_position( *frame, mlt_producer_position( this ) );
1101
1102         // Set the position of this producer
1103         mlt_properties_set_position( MLT_FRAME_PROPERTIES( *frame ), "avformat_position", mlt_producer_frame( this ) );
1104
1105         // Set up the video
1106         producer_set_up_video( this, *frame );
1107
1108         // Set up the audio
1109         producer_set_up_audio( this, *frame );
1110
1111         // Set the aspect_ratio
1112         mlt_properties_set_double( MLT_FRAME_PROPERTIES( *frame ), "aspect_ratio", mlt_properties_get_double( MLT_PRODUCER_PROPERTIES( this ), "aspect_ratio" ) );
1113
1114         // Calculate the next timecode
1115         mlt_producer_prepare_next( this );
1116
1117         return 0;
1118 }