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

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