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