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