research.m1stereo.tv/gitweb/ - melted/blob - src/modules/avformat/producer_avformat.c

   1 /*
   2  * producer_avformat.c -- avformat producer
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 // MLT Header files
  22 #include <framework/mlt_producer.h>
  23 #include <framework/mlt_frame.h>
  24
  25 // ffmpeg Header files
  26 #include <avformat.h>
  27 #ifdef SWSCALE
  28 #include <swscale.h>
  29 #endif
  30
  31 // System header files
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <pthread.h>
  35 #include <math.h>
  36
  37 void avformat_lock( );
  38 void avformat_unlock( );
  39
  40 // Forward references.
  41 static int producer_open( mlt_producer this, mlt_profile profile, char *file );
  42 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
  43
  44 /** Constructor for libavformat.
  45 */
  46
  47 mlt_producer producer_avformat_init( mlt_profile profile, char *file )
  48 {
  49         mlt_producer this = NULL;
  50
  51         // Check that we have a non-NULL argument
  52         if ( file != NULL )
  53         {
  54                 // Construct the producer
  55                 this = calloc( 1, sizeof( struct mlt_producer_s ) );
  56
  57                 // Initialise it
  58                 if ( mlt_producer_init( this, NULL ) == 0 )
  59                 {
  60                         // Get the properties
  61                         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
  62
  63                         // Set the resource property (required for all producers)
  64                         mlt_properties_set( properties, "resource", file );
  65
  66                         // Register our get_frame implementation
  67                         this->get_frame = producer_get_frame;
  68
  69                         // Open the file
  70                         if ( producer_open( this, profile, file ) != 0 )
  71                         {
  72                                 // Clean up
  73                                 mlt_producer_close( this );
  74                                 this = NULL;
  75                         }
  76                 }
  77         }
  78
  79         return this;
  80 }
  81
  82 /** Find the default streams.
  83 */
  84
  85 static void find_default_streams( AVFormatContext *context, int *audio_index, int *video_index )
  86 {
  87         int i;
  88
  89         // Allow for multiple audio and video streams in the file and select first of each (if available)
  90         for( i = 0; i < context->nb_streams; i++ )
  91         {
  92                 // Get the codec context
  93                 AVCodecContext *codec_context = context->streams[ i ]->codec;
  94
  95                 if ( avcodec_find_decoder( codec_context->codec_id ) == NULL )
  96                         continue;
  97
  98                 // Determine the type and obtain the first index of each type
  99                 switch( codec_context->codec_type )
 100                 {
 101                         case CODEC_TYPE_VIDEO:
 102                                 if ( *video_index < 0 )
 103                                         *video_index = i;
 104                                 break;
 105                         case CODEC_TYPE_AUDIO:
 106                                 if ( *audio_index < 0 )
 107                                         *audio_index = i;
 108                                 break;
 109                         default:
 110                                 break;
 111                 }
 112         }
 113 }
 114
 115 /** Producer file destructor.
 116 */
 117
 118 static void producer_file_close( void *context )
 119 {
 120         if ( context != NULL )
 121         {
 122                 // Lock the mutex now
 123                 avformat_lock( );
 124
 125                 // Close the file
 126                 av_close_input_file( context );
 127
 128                 // Unlock the mutex now
 129                 avformat_unlock( );
 130         }
 131 }
 132
 133 /** Producer file destructor.
 134 */
 135
 136 static void producer_codec_close( void *codec )
 137 {
 138         if ( codec != NULL )
 139         {
 140                 // Lock the mutex now
 141                 avformat_lock( );
 142
 143                 // Close the file
 144                 avcodec_close( codec );
 145
 146                 // Unlock the mutex now
 147                 avformat_unlock( );
 148         }
 149 }
 150
 151 /** Open the file.
 152 */
 153
 154 static int producer_open( mlt_producer this, mlt_profile profile, char *file )
 155 {
 156         // Return an error code (0 == no error)
 157         int error = 0;
 158
 159         // Context for avformat
 160         AVFormatContext *context = NULL;
 161
 162         // Get the properties
 163         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 164
 165         // We will treat everything with the producer fps
 166         double fps = mlt_profile_fps( profile );
 167
 168         // Lock the mutex now
 169         avformat_lock( );
 170
 171         // If "MRL", then create AVInputFormat
 172         AVInputFormat *format = NULL;
 173         AVFormatParameters *params = NULL;
 174         char *standard = NULL;
 175         char *mrl = strchr( file, ':' );
 176
 177         // AV option (0 = both, 1 = video, 2 = audio)
 178         int av = 0;
 179
 180         // Setting lowest log level
 181         av_log_set_level( -1 );
 182
 183         // Only if there is not a protocol specification that avformat can handle
 184         if ( mrl && !url_exist( file ) )
 185         {
 186                 // 'file' becomes format abbreviation
 187                 mrl[0] = 0;
 188
 189                 // Lookup the format
 190                 format = av_find_input_format( file );
 191
 192                 // Eat the format designator
 193                 file = ++mrl;
 194
 195                 if ( format )
 196                 {
 197                         // Allocate params
 198                         params = calloc( sizeof( AVFormatParameters ), 1 );
 199
 200                         // These are required by video4linux (defaults)
 201                         params->width = 640;
 202                         params->height = 480;
 203                         params->time_base= (AVRational){1,25};
 204                         // params->device = file;
 205                         params->channels = 2;
 206                         params->sample_rate = 48000;
 207                 }
 208
 209                 // XXX: this does not work anymore since avdevice
 210                 // TODO: make producer_avddevice?
 211                 // Parse out params
 212                 mrl = strchr( file, '?' );
 213                 while ( mrl )
 214                 {
 215                         mrl[0] = 0;
 216                         char *name = strdup( ++mrl );
 217                         char *value = strchr( name, ':' );
 218                         if ( value )
 219                         {
 220                                 value[0] = 0;
 221                                 value++;
 222                                 char *t = strchr( value, '&' );
 223                                 if ( t )
 224                                         t[0] = 0;
 225                                 if ( !strcmp( name, "frame_rate" ) )
 226                                         params->time_base.den = atoi( value );
 227                                 else if ( !strcmp( name, "frame_rate_base" ) )
 228                                         params->time_base.num = atoi( value );
 229                                 else if ( !strcmp( name, "sample_rate" ) )
 230                                         params->sample_rate = atoi( value );
 231                                 else if ( !strcmp( name, "channels" ) )
 232                                         params->channels = atoi( value );
 233                                 else if ( !strcmp( name, "width" ) )
 234                                         params->width = atoi( value );
 235                                 else if ( !strcmp( name, "height" ) )
 236                                         params->height = atoi( value );
 237                                 else if ( !strcmp( name, "standard" ) )
 238                                 {
 239                                         standard = strdup( value );
 240                                         params->standard = standard;
 241                                 }
 242                                 else if ( !strcmp( name, "av" ) )
 243                                         av = atoi( value );
 244                         }
 245                         free( name );
 246                         mrl = strchr( mrl, '&' );
 247                 }
 248         }
 249
 250         // Now attempt to open the file
 251         error = av_open_input_file( &context, file, format, 0, params ) < 0;
 252
 253         // Cleanup AVFormatParameters
 254         free( standard );
 255         free( params );
 256
 257         // If successful, then try to get additional info
 258         if ( error == 0 )
 259         {
 260                 // Get the stream info
 261                 error = av_find_stream_info( context ) < 0;
 262
 263                 // Continue if no error
 264                 if ( error == 0 )
 265                 {
 266                         // We will default to the first audio and video streams found
 267                         int audio_index = -1;
 268                         int video_index = -1;
 269                         int av_bypass = 0;
 270
 271                         // Now set properties where we can (use default unknowns if required)
 272                         if ( context->duration != AV_NOPTS_VALUE )
 273                         {
 274                                 // This isn't going to be accurate for all formats
 275                                 mlt_position frames = ( mlt_position )( ( ( double )context->duration / ( double )AV_TIME_BASE ) * fps + 0.5 );
 276                                 mlt_properties_set_position( properties, "out", frames - 1 );
 277                                 mlt_properties_set_position( properties, "length", frames );
 278                         }
 279
 280                         // Find default audio and video streams
 281                         find_default_streams( context, &audio_index, &video_index );
 282
 283             if ( context->start_time != AV_NOPTS_VALUE )
 284                 mlt_properties_set_double( properties, "_start_time", context->start_time );
 285
 286                         // Check if we're seekable (something funny about mpeg here :-/)
 287                         if ( strcmp( file, "pipe:" ) && strncmp( file, "http://", 6 ) )
 288                         {
 289                                 mlt_properties_set_int( properties, "seekable", av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ), AVSEEK_FLAG_BACKWARD ) >= 0 );
 290                                 mlt_properties_set_data( properties, "dummy_context", context, 0, producer_file_close, NULL );
 291                                 av_open_input_file( &context, file, NULL, 0, NULL );
 292                                 av_find_stream_info( context );
 293                         }
 294                         else
 295                                 av_bypass = 1;
 296
 297                         // Store selected audio and video indexes on properties
 298                         mlt_properties_set_int( properties, "audio_index", audio_index );
 299                         mlt_properties_set_int( properties, "video_index", video_index );
 300                         mlt_properties_set_int( properties, "_last_position", -1 );
 301
 302                         // Fetch the width, height and aspect ratio
 303                         if ( video_index != -1 )
 304                         {
 305                                 AVCodecContext *codec_context = context->streams[ video_index ]->codec;
 306                                 mlt_properties_set_int( properties, "width", codec_context->width );
 307                                 mlt_properties_set_int( properties, "height", codec_context->height );
 308                                 mlt_properties_set_double( properties, "aspect_ratio", av_q2d( codec_context->sample_aspect_ratio ) );
 309                         }
 310
 311                         // Read Metadata
 312                         if (context->title != NULL)
 313                                 mlt_properties_set(properties, "meta.attr.title.markup", context->title );
 314                         if (context->author != NULL)
 315                                 mlt_properties_set(properties, "meta.attr.author.markup", context->author );
 316                         if (context->copyright != NULL)
 317                                 mlt_properties_set(properties, "meta.attr.copyright.markup", context->copyright );
 318                         if (context->comment != NULL)
 319                                 mlt_properties_set(properties, "meta.attr.comment.markup", context->comment );
 320                         if (context->album != NULL)
 321                                 mlt_properties_set(properties, "meta.attr.album.markup", context->album );
 322                         if (context->year != 0)
 323                                 mlt_properties_set_int(properties, "meta.attr.year.markup", context->year );
 324                         if (context->track != 0)
 325                                 mlt_properties_set_int(properties, "meta.attr.track.markup", context->track );
 326
 327                         // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
 328                         if ( av == 0 && !av_bypass && audio_index != -1 && video_index != -1 )
 329                         {
 330                                 // We'll use the open one as our video_context
 331                                 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
 332
 333                                 // And open again for our audio context
 334                                 av_open_input_file( &context, file, NULL, 0, NULL );
 335                                 av_find_stream_info( context );
 336
 337                                 // Audio context
 338                                 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
 339                         }
 340                         else if ( av != 2 && video_index != -1 )
 341                         {
 342                                 // We only have a video context
 343                                 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
 344                         }
 345                         else if ( audio_index != -1 )
 346                         {
 347                                 // We only have an audio context
 348                                 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
 349                         }
 350                         else
 351                         {
 352                                 // Something has gone wrong
 353                                 error = -1;
 354                         }
 355
 356                         mlt_properties_set_int( properties, "av_bypass", av_bypass );
 357                 }
 358         }
 359
 360         // Unlock the mutex now
 361         avformat_unlock( );
 362
 363         return error;
 364 }
 365
 366 /** Convert a frame position to a time code.
 367 */
 368
 369 static double producer_time_of_frame( mlt_producer this, mlt_position position )
 370 {
 371         return ( double )position / mlt_producer_get_fps( this );
 372 }
 373
 374 static inline void convert_image( AVFrame *frame, uint8_t *buffer, int pix_fmt, mlt_image_format format, int width, int height )
 375 {
 376 #ifdef SWSCALE
 377         if ( format == mlt_image_yuv420p )
 378         {
 379                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 380                         width, height, PIX_FMT_YUV420P, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 381                 AVPicture output;
 382                 output.data[0] = buffer;
 383                 output.data[1] = buffer + width * height;
 384                 output.data[2] = buffer + ( 3 * width * height ) / 2;
 385                 output.linesize[0] = width;
 386                 output.linesize[1] = width >> 1;
 387                 output.linesize[2] = width >> 1;
 388                 sws_scale( context, frame->data, frame->linesize, 0, height,
 389                         output.data, output.linesize);
 390                 sws_freeContext( context );
 391         }
 392         else if ( format == mlt_image_rgb24 )
 393         {
 394                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 395                         width, height, PIX_FMT_RGB24, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 396                 AVPicture output;
 397                 avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
 398                 sws_scale( context, frame->data, frame->linesize, 0, height,
 399                         output.data, output.linesize);
 400                 sws_freeContext( context );
 401         }
 402         else
 403         {
 404                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 405                         width, height, PIX_FMT_YUYV422, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 406                 AVPicture output;
 407                 avpicture_fill( &output, buffer, PIX_FMT_YUYV422, width, height );
 408                 sws_scale( context, frame->data, frame->linesize, 0, height,
 409                         output.data, output.linesize);
 410                 sws_freeContext( context );
 411         }
 412 #else
 413         if ( format == mlt_image_yuv420p )
 414         {
 415                 AVPicture pict;
 416                 pict.data[0] = buffer;
 417                 pict.data[1] = buffer + width * height;
 418                 pict.data[2] = buffer + ( 3 * width * height ) / 2;
 419                 pict.linesize[0] = width;
 420                 pict.linesize[1] = width >> 1;
 421                 pict.linesize[2] = width >> 1;
 422                 img_convert( &pict, PIX_FMT_YUV420P, (AVPicture *)frame, pix_fmt, width, height );
 423         }
 424         else if ( format == mlt_image_rgb24 )
 425         {
 426                 AVPicture output;
 427                 avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
 428                 img_convert( &output, PIX_FMT_RGB24, (AVPicture *)frame, pix_fmt, width, height );
 429         }
 430         else
 431         {
 432                 AVPicture output;
 433                 avpicture_fill( &output, buffer, PIX_FMT_YUV422, width, height );
 434                 img_convert( &output, PIX_FMT_YUV422, (AVPicture *)frame, pix_fmt, width, height );
 435         }
 436 #endif
 437 }
 438
 439 /** Get an image from a frame.
 440 */
 441
 442 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 443 {
 444         // Get the properties from the frame
 445         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 446
 447         // Obtain the frame number of this frame
 448         mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
 449
 450         // Get the producer
 451         mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
 452
 453         // Get the producer properties
 454         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 455
 456         // Fetch the video_context
 457         AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
 458
 459         // Get the video_index
 460         int index = mlt_properties_get_int( properties, "video_index" );
 461
 462         // Obtain the expected frame numer
 463         mlt_position expected = mlt_properties_get_position( properties, "_video_expected" );
 464
 465         // Get the video stream
 466         AVStream *stream = context->streams[ index ];
 467
 468         // Get codec context
 469         AVCodecContext *codec_context = stream->codec;
 470
 471         // Packet
 472         AVPacket pkt;
 473
 474         // Get the conversion frame
 475         AVFrame *av_frame = mlt_properties_get_data( properties, "av_frame", NULL );
 476
 477         // Special case pause handling flag
 478         int paused = 0;
 479
 480         // Special case ffwd handling
 481         int ignore = 0;
 482
 483         // We may want to use the source fps if available
 484         double source_fps = mlt_properties_get_double( properties, "source_fps" );
 485         double fps = mlt_producer_get_fps( this );
 486
 487         // This is the physical frame position in the source
 488         int req_position = ( int )( position / fps * source_fps + 0.5 );
 489
 490         // Get the seekable status
 491         int seekable = mlt_properties_get_int( properties, "seekable" );
 492
 493         // Generate the size in bytes
 494         int size = 0;
 495
 496         // Hopefully provide better support for streams...
 497         int av_bypass = mlt_properties_get_int( properties, "av_bypass" );
 498
 499         // Determines if we have to decode all frames in a sequence
 500         int must_decode = 1;
 501
 502         // Set the result arguments that we know here (only *buffer is now required)
 503         *width = codec_context->width;
 504         *height = codec_context->height;
 505
 506         switch ( *format )
 507         {
 508                 case mlt_image_yuv420p:
 509                         size = *width * 3 * ( *height + 1 ) / 2;
 510                         break;
 511                 case mlt_image_rgb24:
 512                         size = *width * ( *height + 1 ) * 3;
 513                         break;
 514                 default:
 515                         *format = mlt_image_yuv422;
 516                         size = *width * ( *height + 1 ) * 2;
 517                         break;
 518         }
 519
 520         // Set this on the frame properties
 521         mlt_properties_set_int( frame_properties, "width", *width );
 522         mlt_properties_set_int( frame_properties, "height", *height );
 523
 524         // Construct the output image
 525         *buffer = mlt_pool_alloc( size );
 526
 527         // Temporary hack to improve intra frame only
 528         must_decode = strcmp( codec_context->codec->name, "mjpeg" ) &&
 529                                   strcmp( codec_context->codec->name, "rawvideo" ) &&
 530                                   strcmp( codec_context->codec->name, "dvvideo" );
 531
 532         // Seek if necessary
 533         if ( position != expected )
 534         {
 535                 if ( av_frame != NULL && position + 1 == expected )
 536                 {
 537                         // We're paused - use last image
 538                         paused = 1;
 539                 }
 540                 else if ( !seekable && position > expected && ( position - expected ) < 250 )
 541                 {
 542                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
 543                         ignore = ( int )( ( position - expected ) / fps * source_fps );
 544                 }
 545                 else if ( seekable && ( position < expected || position - expected >= 12 ) )
 546                 {
 547                         // Calculate the timestamp for the requested frame
 548                         int64_t timestamp = ( int64_t )( ( double )req_position / source_fps * AV_TIME_BASE + 0.5 );
 549                         if ( ( uint64_t )context->start_time != AV_NOPTS_VALUE )
 550                                 timestamp += context->start_time;
 551                         if ( must_decode )
 552                                 timestamp -= AV_TIME_BASE;
 553                         if ( timestamp < 0 )
 554                                 timestamp = 0;
 555
 556                         // Set to the timestamp
 557                         av_seek_frame( context, -1, timestamp, AVSEEK_FLAG_BACKWARD );
 558
 559                         // Remove the cached info relating to the previous position
 560                         mlt_properties_set_int( properties, "_current_position", -1 );
 561                         mlt_properties_set_int( properties, "_last_position", -1 );
 562                         mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
 563                         av_frame = NULL;
 564                 }
 565         }
 566
 567         // Duplicate the last image if necessary (see comment on rawvideo below)
 568         int current_position = mlt_properties_get_int( properties, "_current_position" );
 569         int got_picture = mlt_properties_get_int( properties, "_got_picture" );
 570         if ( av_frame != NULL && got_picture && ( paused || current_position >= req_position ) && av_bypass == 0 )
 571         {
 572                 // Duplicate it
 573                 convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
 574
 575                 // Set this on the frame properties
 576                 mlt_properties_set_data( frame_properties, "image", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
 577         }
 578         else
 579         {
 580                 int ret = 0;
 581                 int int_position = 0;
 582                 got_picture = 0;
 583
 584                 av_init_packet( &pkt );
 585
 586                 // Construct an AVFrame for YUV422 conversion
 587                 if ( av_frame == NULL )
 588                 {
 589                         av_frame = avcodec_alloc_frame( );
 590                         mlt_properties_set_data( properties, "av_frame", av_frame, 0, av_free, NULL );
 591                 }
 592
 593                 while( ret >= 0 && !got_picture )
 594                 {
 595                         // Read a packet
 596                         ret = av_read_frame( context, &pkt );
 597
 598                         // We only deal with video from the selected video_index
 599                         if ( ret >= 0 && pkt.stream_index == index && pkt.size > 0 )
 600                         {
 601                                 // Determine time code of the packet
 602                                 int_position = ( int )( av_q2d( stream->time_base ) * pkt.dts * source_fps + 0.5 );
 603                                 if ( context->start_time != AV_NOPTS_VALUE )
 604                                         int_position -= ( int )( context->start_time * source_fps / AV_TIME_BASE + 0.5 );
 605                                 int last_position = mlt_properties_get_int( properties, "_last_position" );
 606                                 if ( int_position == last_position )
 607                                         int_position = last_position + 1;
 608                                 mlt_properties_set_int( properties, "_last_position", int_position );
 609
 610                                 // Decode the image
 611                                 if ( must_decode || int_position >= req_position )
 612                                         ret = avcodec_decode_video( codec_context, av_frame, &got_picture, pkt.data, pkt.size );
 613
 614                                 if ( got_picture )
 615                                 {
 616                                         // Handle ignore
 617                                         if ( int_position < req_position )
 618                                         {
 619                                                 ignore = 0;
 620                                                 got_picture = 0;
 621                                         }
 622                                         else if ( int_position >= req_position )
 623                                         {
 624                                                 ignore = 0;
 625                                         }
 626                                         else if ( ignore -- )
 627                                         {
 628                                                 got_picture = 0;
 629                                         }
 630                                 }
 631                                 av_free_packet( &pkt );
 632                         }
 633                         else if ( ret >= 0 )
 634                         {
 635                                 av_free_packet( &pkt );
 636                         }
 637
 638                         // Now handle the picture if we have one
 639                         if ( got_picture )
 640                         {
 641                                 mlt_properties_set_int( frame_properties, "progressive", !av_frame->interlaced_frame );
 642                                 mlt_properties_set_int( frame_properties, "top_field_first", av_frame->top_field_first );
 643                                 convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
 644                                 mlt_properties_set_data( frame_properties, "image", *buffer, size, (mlt_destructor)mlt_pool_release, NULL );
 645                                 mlt_properties_set_int( properties, "_current_position", int_position );
 646                                 mlt_properties_set_int( properties, "_got_picture", 1 );
 647                         }
 648                 }
 649         }
 650
 651         // Very untidy - for rawvideo, the packet contains the frame, hence the free packet
 652         // above will break the pause behaviour - so we wipe the frame now
 653         if ( !strcmp( codec_context->codec->name, "rawvideo" ) )
 654                 mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
 655
 656         // Set the field order property for this frame
 657         mlt_properties_set_int( frame_properties, "top_field_first", mlt_properties_get_int( properties, "top_field_first" ) );
 658
 659         // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
 660         mlt_properties_set_position( properties, "_video_expected", position + 1 );
 661
 662         return 0;
 663 }
 664
 665 /** Set up video handling.
 666 */
 667
 668 static void producer_set_up_video( mlt_producer this, mlt_frame frame )
 669 {
 670         // Get the properties
 671         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 672
 673         // Fetch the video_context
 674         AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
 675
 676         // Get the video_index
 677         int index = mlt_properties_get_int( properties, "video_index" );
 678
 679         // Get the frame properties
 680         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 681
 682         if ( context != NULL && index != -1 )
 683         {
 684                 // Get the video stream
 685                 AVStream *stream = context->streams[ index ];
 686
 687                 // Get codec context
 688                 AVCodecContext *codec_context = stream->codec;
 689
 690                 // Get the codec
 691                 AVCodec *codec = mlt_properties_get_data( properties, "video_codec", NULL );
 692
 693                 // Initialise the codec if necessary
 694                 if ( codec == NULL )
 695                 {
 696                         // Initialise multi-threading
 697                         int thread_count = mlt_properties_get_int( properties, "threads" );
 698                         if ( thread_count == 0 && getenv( "MLT_AVFORMAT_THREADS" ) )
 699                                 thread_count = atoi( getenv( "MLT_AVFORMAT_THREADS" ) );
 700                         if ( thread_count > 1 )
 701                         {
 702                                 avcodec_thread_init( codec_context, thread_count );
 703                                 codec_context->thread_count = thread_count;
 704                         }
 705
 706                         // Find the codec
 707                         codec = avcodec_find_decoder( codec_context->codec_id );
 708
 709                         // If we don't have a codec and we can't initialise it, we can't do much more...
 710                         if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
 711                         {
 712                                 // Now store the codec with its destructor
 713                                 mlt_properties_set_data( properties, "video_codec", codec_context, 0, producer_codec_close, NULL );
 714                         }
 715                         else
 716                         {
 717                                 // Remember that we can't use this later
 718                                 mlt_properties_set_int( properties, "video_index", -1 );
 719                         }
 720                 }
 721
 722                 // No codec, no show...
 723                 if ( codec != NULL )
 724                 {
 725                         double source_fps = 0;
 726                         int norm_aspect_ratio = mlt_properties_get_int( properties, "norm_aspect_ratio" );
 727                         double force_aspect_ratio = mlt_properties_get_double( properties, "force_aspect_ratio" );
 728                         double aspect_ratio;
 729
 730                         // XXX: We won't know the real aspect ratio until an image is decoded
 731                         // but we do need it now (to satisfy filter_resize) - take a guess based
 732                         // on pal/ntsc
 733                         if ( force_aspect_ratio > 0.0 )
 734                         {
 735                                 aspect_ratio = force_aspect_ratio;
 736                         }
 737                         else if ( !norm_aspect_ratio && codec_context->sample_aspect_ratio.num > 0 )
 738                         {
 739                                 aspect_ratio = av_q2d( codec_context->sample_aspect_ratio );
 740                         }
 741                         else
 742                         {
 743                                 int is_pal = mlt_producer_get_fps( this ) == 25.0;
 744                                 aspect_ratio = is_pal ? 59.0/54.0 : 10.0/11.0;
 745                         }
 746
 747                         // Determine the fps
 748                         source_fps = ( double )codec_context->time_base.den / ( codec_context->time_base.num == 0 ? 1 : codec_context->time_base.num );
 749
 750                         // We'll use fps if it's available
 751                         if ( source_fps > 0 )
 752                                 mlt_properties_set_double( properties, "source_fps", source_fps );
 753                         else
 754                                 mlt_properties_set_double( properties, "source_fps", mlt_producer_get_fps( this ) );
 755                         mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
 756
 757                         // Set the width and height
 758                         mlt_properties_set_int( frame_properties, "width", codec_context->width );
 759                         mlt_properties_set_int( frame_properties, "height", codec_context->height );
 760                         mlt_properties_set_double( frame_properties, "aspect_ratio", aspect_ratio );
 761
 762                         mlt_frame_push_get_image( frame, producer_get_image );
 763                         mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
 764                 }
 765                 else
 766                 {
 767                         mlt_properties_set_int( frame_properties, "test_image", 1 );
 768                 }
 769         }
 770         else
 771         {
 772                 mlt_properties_set_int( frame_properties, "test_image", 1 );
 773         }
 774 }
 775
 776 /** Get the audio from a frame.
 777 */
 778
 779 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 780 {
 781         // Get the properties from the frame
 782         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 783
 784         // Obtain the frame number of this frame
 785         mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
 786
 787         // Get the producer
 788         mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
 789
 790         // Get the producer properties
 791         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 792
 793         // Fetch the audio_context
 794         AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
 795
 796         // Get the audio_index
 797         int index = mlt_properties_get_int( properties, "audio_index" );
 798
 799         // Get the seekable status
 800         int seekable = mlt_properties_get_int( properties, "seekable" );
 801
 802         // Obtain the expected frame numer
 803         mlt_position expected = mlt_properties_get_position( properties, "_audio_expected" );
 804
 805         // Obtain the resample context if it exists (not always needed)
 806         ReSampleContext *resample = mlt_properties_get_data( properties, "audio_resample", NULL );
 807
 808         // Obtain the audio buffer
 809         int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
 810
 811         // Get amount of audio used
 812         int audio_used =  mlt_properties_get_int( properties, "_audio_used" );
 813
 814         // Calculate the real time code
 815         double real_timecode = producer_time_of_frame( this, position );
 816
 817         // Get the audio stream
 818         AVStream *stream = context->streams[ index ];
 819
 820         // Get codec context
 821         AVCodecContext *codec_context = stream->codec;
 822
 823         // Packet
 824         AVPacket pkt;
 825
 826         // Number of frames to ignore (for ffwd)
 827         int ignore = 0;
 828
 829         // Flag for paused (silence)
 830         int paused = 0;
 831
 832         // Check for resample and create if necessary
 833         if ( resample == NULL && codec_context->channels <= 2 )
 834         {
 835                 // Create the resampler
 836                 resample = audio_resample_init( *channels, codec_context->channels, *frequency, codec_context->sample_rate );
 837
 838                 // And store it on properties
 839                 mlt_properties_set_data( properties, "audio_resample", resample, 0, ( mlt_destructor )audio_resample_close, NULL );
 840         }
 841         else if ( resample == NULL )
 842         {
 843                 *channels = codec_context->channels;
 844                 *frequency = codec_context->sample_rate;
 845         }
 846
 847         // Check for audio buffer and create if necessary
 848         if ( audio_buffer == NULL )
 849         {
 850                 // Allocate the audio buffer
 851                 audio_buffer = mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
 852
 853                 // And store it on properties for reuse
 854                 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
 855         }
 856
 857         // Seek if necessary
 858         if ( position != expected )
 859         {
 860                 if ( position + 1 == expected )
 861                 {
 862                         // We're paused - silence required
 863                         paused = 1;
 864                 }
 865                 else if ( !seekable && position > expected && ( position - expected ) < 250 )
 866                 {
 867                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
 868                         ignore = position - expected;
 869                 }
 870                 else if ( position < expected || position - expected >= 12 )
 871                 {
 872                         // Set to the real timecode
 873                         if ( av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ) + real_timecode * 1000000.0, AVSEEK_FLAG_BACKWARD ) != 0 )
 874                                 paused = 1;
 875
 876                         // Clear the usage in the audio buffer
 877                         audio_used = 0;
 878                 }
 879         }
 880
 881         // Get the audio if required
 882         if ( !paused )
 883         {
 884                 int ret = 0;
 885                 int got_audio = 0;
 886                 int16_t *temp = av_malloc( sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE );
 887
 888                 av_init_packet( &pkt );
 889
 890                 while( ret >= 0 && !got_audio )
 891                 {
 892                         // Check if the buffer already contains the samples required
 893                         if ( audio_used >= *samples && ignore == 0 )
 894                         {
 895                                 got_audio = 1;
 896                                 break;
 897                         }
 898
 899                         // Read a packet
 900                         ret = av_read_frame( context, &pkt );
 901
 902                         int len = pkt.size;
 903                         uint8_t *ptr = pkt.data;
 904
 905                         // We only deal with audio from the selected audio_index
 906                         while ( ptr != NULL && ret >= 0 && pkt.stream_index == index && len > 0 )
 907                         {
 908                                 int data_size = sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE;
 909
 910                                 // Decode the audio
 911 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(29<<8)+0))
 912                                 ret = avcodec_decode_audio2( codec_context, temp, &data_size, ptr, len );
 913 #else
 914                                 ret = avcodec_decode_audio( codec_context, temp, &data_size, ptr, len );
 915 #endif
 916                                 if ( ret < 0 )
 917                                 {
 918                                         ret = 0;
 919                                         break;
 920                                 }
 921
 922                                 len -= ret;
 923                                 ptr += ret;
 924
 925                                 if ( data_size > 0 )
 926                                 {
 927                                         if ( resample != NULL )
 928                                         {
 929                                                 audio_used += audio_resample( resample, &audio_buffer[ audio_used * *channels ], temp, data_size / ( codec_context->channels * sizeof( int16_t ) ) );
 930                                         }
 931                                         else
 932                                         {
 933                                                 memcpy( &audio_buffer[ audio_used * *channels ], temp, data_size );
 934                                                 audio_used += data_size / ( codec_context->channels * sizeof( int16_t ) );
 935                                         }
 936
 937                                         // Handle ignore
 938                                         while ( ignore && audio_used > *samples )
 939                                         {
 940                                                 ignore --;
 941                                                 audio_used -= *samples;
 942                                                 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
 943                                         }
 944                                 }
 945
 946                                 // If we're behind, ignore this packet
 947                                 float current_pts = av_q2d( stream->time_base ) * pkt.pts;
 948                                 if ( seekable && ( !ignore && current_pts <= ( real_timecode - 0.02 ) ) )
 949                                         ignore = 1;
 950                         }
 951
 952                         // We're finished with this packet regardless
 953                         av_free_packet( &pkt );
 954                 }
 955
 956                 *buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
 957                 mlt_properties_set_data( frame_properties, "audio", *buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
 958
 959                 // Now handle the audio if we have enough
 960                 if ( audio_used >= *samples )
 961                 {
 962                         memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
 963                         audio_used -= *samples;
 964                         memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
 965                 }
 966                 else
 967                 {
 968                         memset( *buffer, 0, *samples * *channels * sizeof( int16_t ) );
 969                 }
 970
 971                 // Store the number of audio samples still available
 972                 mlt_properties_set_int( properties, "_audio_used", audio_used );
 973
 974                 // Release the temporary audio
 975                 av_free( temp );
 976         }
 977         else
 978         {
 979                 // Get silence and don't touch the context
 980                 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
 981         }
 982
 983         // Regardless of speed (other than paused), we expect to get the next frame
 984         if ( !paused )
 985                 mlt_properties_set_position( properties, "_audio_expected", position + 1 );
 986
 987         return 0;
 988 }
 989
 990 /** Set up audio handling.
 991 */
 992
 993 static void producer_set_up_audio( mlt_producer this, mlt_frame frame )
 994 {
 995         // Get the properties
 996         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 997
 998         // Fetch the audio_context
 999         AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
1000
1001         // Get the audio_index
1002         int index = mlt_properties_get_int( properties, "audio_index" );
1003
1004         // Deal with audio context
1005         if ( context != NULL && index != -1 )
1006         {
1007                 // Get the frame properties
1008                 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
1009
1010                 // Get the audio stream
1011                 AVStream *stream = context->streams[ index ];
1012
1013                 // Get codec context
1014                 AVCodecContext *codec_context = stream->codec;
1015
1016                 // Get the codec
1017                 AVCodec *codec = mlt_properties_get_data( properties, "audio_codec", NULL );
1018
1019                 // Initialise the codec if necessary
1020                 if ( codec == NULL )
1021                 {
1022                         // Initialise multi-threading
1023                         int thread_count = mlt_properties_get_int( properties, "threads" );
1024                         if ( thread_count == 0 && getenv( "MLT_AVFORMAT_THREADS" ) )
1025                                 thread_count = atoi( getenv( "MLT_AVFORMAT_THREADS" ) );
1026                         if ( thread_count > 1 )
1027                         {
1028                                 avcodec_thread_init( codec_context, thread_count );
1029                                 codec_context->thread_count = thread_count;
1030                         }
1031
1032                         // Find the codec
1033                         codec = avcodec_find_decoder( codec_context->codec_id );
1034
1035                         // If we don't have a codec and we can't initialise it, we can't do much more...
1036                         if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
1037                         {
1038                                 // Now store the codec with its destructor
1039                                 mlt_properties_set_data( properties, "audio_codec", codec_context, 0, producer_codec_close, NULL );
1040
1041                         }
1042                         else
1043                         {
1044                                 // Remember that we can't use this later
1045                                 mlt_properties_set_int( properties, "audio_index", -1 );
1046                         }
1047                 }
1048
1049                 // No codec, no show...
1050                 if ( codec != NULL )
1051                 {
1052                         mlt_frame_push_audio( frame, producer_get_audio );
1053                         mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
1054                         mlt_properties_set_int( frame_properties, "frequency", codec_context->sample_rate );
1055                         mlt_properties_set_int( frame_properties, "channels", codec_context->channels );
1056                 }
1057         }
1058 }
1059
1060 /** Our get frame implementation.
1061 */
1062
1063 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
1064 {
1065         // Create an empty frame
1066         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
1067
1068         // Update timecode on the frame we're creating
1069         mlt_frame_set_position( *frame, mlt_producer_position( this ) );
1070
1071         // Set the position of this producer
1072         mlt_properties_set_position( MLT_FRAME_PROPERTIES( *frame ), "avformat_position", mlt_producer_frame( this ) );
1073
1074         // Set up the video
1075         producer_set_up_video( this, *frame );
1076
1077         // Set up the audio
1078         producer_set_up_audio( this, *frame );
1079
1080         // Set the aspect_ratio
1081         mlt_properties_set_double( MLT_FRAME_PROPERTIES( *frame ), "aspect_ratio", mlt_properties_get_double( MLT_PRODUCER_PROPERTIES( this ), "aspect_ratio" ) );
1082
1083         // Calculate the next timecode
1084         mlt_producer_prepare_next( this );
1085
1086         return 0;
1087 }