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