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_properties_get_double( properties, "fps" );
 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                 // Parse out params
 212                 mrl = strchr( file, '?' );
 213                 while ( mrl )
 214                 {
 215                         mrl[0] = 0;
 216                         char *name = strdup( ++mrl );
 217                         char *value = strchr( name, ':' );
 218                         if ( value )
 219                         {
 220                                 value[0] = 0;
 221                                 value++;
 222                                 char *t = strchr( value, '&' );
 223                                 if ( t )
 224                                         t[0] = 0;
 225                                 if ( !strcmp( name, "frame_rate" ) )
 226                                         params->time_base.den = atoi( value );
 227                                 else if ( !strcmp( name, "frame_rate_base" ) )
 228                                         params->time_base.num = atoi( value );
 229                                 else if ( !strcmp( name, "sample_rate" ) )
 230                                         params->sample_rate = atoi( value );
 231                                 else if ( !strcmp( name, "channels" ) )
 232                                         params->channels = atoi( value );
 233                                 else if ( !strcmp( name, "width" ) )
 234                                         params->width = atoi( value );
 235                                 else if ( !strcmp( name, "height" ) )
 236                                         params->height = atoi( value );
 237                                 else if ( !strcmp( name, "standard" ) )
 238                                 {
 239                                         standard = strdup( value );
 240                                         params->standard = standard;
 241                                 }
 242                                 else if ( !strcmp( name, "av" ) )
 243                                         av = atoi( value );
 244                         }
 245                         free( name );
 246                         mrl = strchr( mrl, '&' );
 247                 }
 248         }
 249
 250         // Now attempt to open the file
 251         error = av_open_input_file( &context, file, format, 0, params ) < 0;
 252
 253         // Cleanup AVFormatParameters
 254         free( standard );
 255         free( params );
 256
 257         // If successful, then try to get additional info
 258         if ( error == 0 )
 259         {
 260                 // Get the stream info
 261                 error = av_find_stream_info( context ) < 0;
 262
 263                 // Continue if no error
 264                 if ( error == 0 )
 265                 {
 266                         // We will default to the first audio and video streams found
 267                         int audio_index = -1;
 268                         int video_index = -1;
 269                         int av_bypass = 0;
 270
 271                         // Now set properties where we can (use default unknowns if required)
 272                         if ( context->duration != AV_NOPTS_VALUE )
 273                         {
 274                                 // This isn't going to be accurate for all formats
 275                                 mlt_position frames = ( mlt_position )( ( ( double )context->duration / ( double )AV_TIME_BASE ) * fps );
 276                                 mlt_properties_set_position( properties, "out", frames - 2 );
 277                                 mlt_properties_set_position( properties, "length", frames - 1 );
 278                         }
 279
 280                         // Find default audio and video streams
 281                         find_default_streams( context, &audio_index, &video_index );
 282
 283             if ( context->start_time != AV_NOPTS_VALUE )
 284                 mlt_properties_set_double( properties, "_start_time", context->start_time );
 285
 286                         // Check if we're seekable (something funny about mpeg here :-/)
 287                         if ( strcmp( file, "pipe:" ) && strncmp( file, "http://", 6 ) )
 288                                 mlt_properties_set_int( properties, "seekable", av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ), AVSEEK_FLAG_BACKWARD ) >= 0 );
 289                         else
 290                                 av_bypass = 1;
 291
 292                         // Store selected audio and video indexes on properties
 293                         mlt_properties_set_int( properties, "audio_index", audio_index );
 294                         mlt_properties_set_int( properties, "video_index", video_index );
 295                         mlt_properties_set_int( properties, "_last_position", -1 );
 296
 297                         // Fetch the width, height and aspect ratio
 298                         if ( video_index != -1 )
 299                         {
 300                                 AVCodecContext *codec_context = context->streams[ video_index ]->codec;
 301                                 mlt_properties_set_int( properties, "width", codec_context->width );
 302                                 mlt_properties_set_int( properties, "height", codec_context->height );
 303                                 mlt_properties_set_double( properties, "aspect_ratio", av_q2d( codec_context->sample_aspect_ratio ) );
 304                         }
 305
 306                         // Read Metadata
 307                         if (context->title != NULL)
 308                                 mlt_properties_set(properties, "meta.attr.title.markup", context->title );
 309                         if (context->author != NULL)
 310                                 mlt_properties_set(properties, "meta.attr.author.markup", context->author );
 311                         if (context->copyright != NULL)
 312                                 mlt_properties_set(properties, "meta.attr.copyright.markup", context->copyright );
 313                         if (context->comment != NULL)
 314                                 mlt_properties_set(properties, "meta.attr.comment.markup", context->comment );
 315                         if (context->album != NULL)
 316                                 mlt_properties_set(properties, "meta.attr.album.markup", context->album );
 317                         if (context->year != 0)
 318                                 mlt_properties_set_int(properties, "meta.attr.year.markup", context->year );
 319                         if (context->track != 0)
 320                                 mlt_properties_set_int(properties, "meta.attr.track.markup", context->track );
 321
 322                         // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
 323                         if ( av == 0 && !av_bypass && audio_index != -1 && video_index != -1 )
 324                         {
 325                                 // We'll use the open one as our video_context
 326                                 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
 327                                 av_seek_frame( context, -1, 0, AVSEEK_FLAG_BACKWARD );
 328
 329                                 // And open again for our audio context
 330                                 av_open_input_file( &context, file, NULL, 0, NULL );
 331                                 av_find_stream_info( context );
 332
 333                                 // Audio context
 334                                 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
 335                         }
 336                         else if ( av != 2 && video_index != -1 )
 337                         {
 338                                 // We only have a video context
 339                                 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
 340                                 av_seek_frame( context, -1, 0, AVSEEK_FLAG_BACKWARD );
 341                         }
 342                         else if ( audio_index != -1 )
 343                         {
 344                                 // We only have an audio context
 345                                 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
 346                         }
 347                         else
 348                         {
 349                                 // Something has gone wrong
 350                                 error = -1;
 351                         }
 352
 353                         mlt_properties_set_int( properties, "av_bypass", av_bypass );
 354                 }
 355         }
 356
 357         // Unlock the mutex now
 358         avformat_unlock( );
 359
 360         return error;
 361 }
 362
 363 /** Convert a frame position to a time code.
 364 */
 365
 366 static double producer_time_of_frame( mlt_producer this, mlt_position position )
 367 {
 368         // Get the properties
 369         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 370
 371         // Obtain the fps
 372         double fps = mlt_properties_get_double( properties, "fps" );
 373
 374         // Do the calc
 375         return ( double )position / fps;
 376 }
 377
 378 static inline void convert_image( AVFrame *frame, uint8_t *buffer, int pix_fmt, mlt_image_format format, int width, int height )
 379 {
 380 #ifdef SWSCALE
 381         if ( format == mlt_image_yuv420p )
 382         {
 383                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 384                         width, height, PIX_FMT_YUV420P, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 385                 AVPicture output;
 386                 output.data[0] = buffer;
 387                 output.data[1] = buffer + width * height;
 388                 output.data[2] = buffer + ( 3 * width * height ) / 2;
 389                 output.linesize[0] = width;
 390                 output.linesize[1] = width >> 1;
 391                 output.linesize[2] = width >> 1;
 392                 sws_scale( context, frame->data, frame->linesize, 0, height,
 393                         output.data, output.linesize);
 394                 sws_freeContext( context );
 395         }
 396         else if ( format == mlt_image_rgb24 )
 397         {
 398                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 399                         width, height, PIX_FMT_RGB24, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 400                 AVPicture output;
 401                 avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
 402                 sws_scale( context, frame->data, frame->linesize, 0, height,
 403                         output.data, output.linesize);
 404                 sws_freeContext( context );
 405         }
 406         else
 407         {
 408                 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
 409                         width, height, PIX_FMT_YUYV422, SWS_FAST_BILINEAR, NULL, NULL, NULL);
 410                 AVPicture output;
 411                 avpicture_fill( &output, buffer, PIX_FMT_YUYV422, width, height );
 412                 sws_scale( context, frame->data, frame->linesize, 0, height,
 413                         output.data, output.linesize);
 414                 sws_freeContext( context );
 415         }
 416 #else
 417         if ( format == mlt_image_yuv420p )
 418         {
 419                 AVPicture pict;
 420                 pict.data[0] = buffer;
 421                 pict.data[1] = buffer + width * height;
 422                 pict.data[2] = buffer + ( 3 * width * height ) / 2;
 423                 pict.linesize[0] = width;
 424                 pict.linesize[1] = width >> 1;
 425                 pict.linesize[2] = width >> 1;
 426                 img_convert( &pict, PIX_FMT_YUV420P, (AVPicture *)frame, pix_fmt, width, height );
 427         }
 428         else if ( format == mlt_image_rgb24 )
 429         {
 430                 AVPicture output;
 431                 avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
 432                 img_convert( &output, PIX_FMT_RGB24, (AVPicture *)frame, pix_fmt, width, height );
 433         }
 434         else
 435         {
 436                 AVPicture output;
 437                 avpicture_fill( &output, buffer, PIX_FMT_YUV422, width, height );
 438                 img_convert( &output, PIX_FMT_YUV422, (AVPicture *)frame, pix_fmt, width, height );
 439         }
 440 #endif
 441 }
 442
 443 /** Get an image from a frame.
 444 */
 445
 446 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 447 {
 448         // Get the properties from the frame
 449         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 450
 451         // Obtain the frame number of this frame
 452         mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
 453
 454         // Get the producer
 455         mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
 456
 457         // Get the producer properties
 458         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 459
 460         // Fetch the video_context
 461         AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
 462
 463         // Get the video_index
 464         int index = mlt_properties_get_int( properties, "video_index" );
 465
 466         // Obtain the expected frame numer
 467         mlt_position expected = mlt_properties_get_position( properties, "_video_expected" );
 468
 469         // Calculate the real time code
 470         double real_timecode = producer_time_of_frame( this, position );
 471
 472         // Get the video stream
 473         AVStream *stream = context->streams[ index ];
 474
 475         // Get codec context
 476         AVCodecContext *codec_context = stream->codec;
 477
 478         // Packet
 479         AVPacket pkt;
 480
 481         // Get the conversion frame
 482         AVFrame *av_frame = mlt_properties_get_data( properties, "av_frame", NULL );
 483
 484         // Special case pause handling flag
 485         int paused = 0;
 486
 487         // Special case ffwd handling
 488         int ignore = 0;
 489
 490         // Current time calcs
 491         int current_position = mlt_properties_get_double( properties, "_current_position" );
 492
 493         // We may want to use the source fps if available
 494         double source_fps = mlt_properties_get_double( properties, "source_fps" );
 495         double fps = mlt_properties_get_double( properties, "fps" );
 496
 497         // This is the physical frame position in the source
 498         int req_position = ( int )( position / fps * source_fps );
 499
 500         // Get the seekable status
 501         int seekable = mlt_properties_get_int( properties, "seekable" );
 502
 503         // Generate the size in bytes
 504         int size = 0;
 505
 506         // Hopefully provide better support for streams...
 507         int av_bypass = mlt_properties_get_int( properties, "av_bypass" );
 508
 509         // Determines if we have to decode all frames in a sequence
 510         int must_decode = 1;
 511
 512         // Set the result arguments that we know here (only *buffer is now required)
 513         *width = codec_context->width;
 514         *height = codec_context->height;
 515
 516         switch ( *format )
 517         {
 518                 case mlt_image_yuv420p:
 519                         size = *width * 3 * ( *height + 1 ) / 2;
 520                         break;
 521                 case mlt_image_rgb24:
 522                         size = *width * ( *height + 1 ) * 3;
 523                         break;
 524                 default:
 525                         *format = mlt_image_yuv422;
 526                         size = *width * ( *height + 1 ) * 2;
 527                         break;
 528         }
 529
 530         // Set this on the frame properties
 531         mlt_properties_set_int( frame_properties, "width", *width );
 532         mlt_properties_set_int( frame_properties, "height", *height );
 533
 534         // Construct the output image
 535         *buffer = mlt_pool_alloc( size );
 536
 537         // Temporary hack to improve intra frame only
 538         must_decode = strcmp( codec_context->codec->name, "mjpeg" ) &&
 539                                   strcmp( codec_context->codec->name, "rawvideo" ) &&
 540                                   strcmp( codec_context->codec->name, "dvvideo" );
 541
 542         // Seek if necessary
 543         if ( position != expected )
 544         {
 545                 if ( av_frame != NULL && position + 1 == expected )
 546                 {
 547                         // We're paused - use last image
 548                         paused = 1;
 549                 }
 550                 else if ( !seekable && position > expected && ( position - expected ) < 250 )
 551                 {
 552                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
 553                         ignore = ( int )( ( position - expected ) / fps * source_fps );
 554                 }
 555                 else if ( seekable && ( position < expected || position - expected >= 12 ) )
 556                 {
 557                         // Calculate the timestamp for the requested frame
 558                         int64_t timestamp = ( int64_t )( ( double )req_position / source_fps * AV_TIME_BASE );
 559                         if ( ( uint64_t )context->start_time != AV_NOPTS_VALUE )
 560                                 timestamp += context->start_time;
 561                         if ( must_decode )
 562                                 timestamp -= AV_TIME_BASE;
 563                         if ( timestamp < 0 )
 564                                 timestamp = 0;
 565
 566                         // Set to the timestamp
 567                         av_seek_frame( context, -1, timestamp, AVSEEK_FLAG_BACKWARD );
 568
 569                         // Remove the cached info relating to the previous position
 570                         mlt_properties_set_int( properties, "_current_position", -1 );
 571                         mlt_properties_set_int( properties, "_last_position", -1 );
 572                         mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
 573                         av_frame = NULL;
 574                 }
 575         }
 576
 577         // Duplicate the last image if necessary (see comment on rawvideo below)
 578         if ( av_frame != NULL && ( paused || mlt_properties_get_int( properties, "_current_position" ) >= req_position ) && av_bypass == 0 )
 579         {
 580                 // Duplicate it
 581                 convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
 582
 583                 // Set this on the frame properties
 584                 mlt_properties_set_data( frame_properties, "image", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
 585         }
 586         else
 587         {
 588                 int ret = 0;
 589                 int got_picture = 0;
 590                 int int_position = 0;
 591
 592                 av_init_packet( &pkt );
 593
 594                 // Construct an AVFrame for YUV422 conversion
 595                 if ( av_frame == NULL )
 596                 {
 597                         av_frame = avcodec_alloc_frame( );
 598                         mlt_properties_set_data( properties, "av_frame", av_frame, 0, av_free, NULL );
 599                 }
 600
 601                 while( ret >= 0 && !got_picture )
 602                 {
 603                         // Read a packet
 604                         ret = av_read_frame( context, &pkt );
 605
 606                         // We only deal with video from the selected video_index
 607                         if ( ret >= 0 && pkt.stream_index == index && pkt.size > 0 )
 608                         {
 609                                 // Determine time code of the packet
 610                                 int_position = ( int )( av_q2d( stream->time_base ) * pkt.dts * source_fps );
 611                                 if ( context->start_time != AV_NOPTS_VALUE )
 612                                         int_position -= ( int )( context->start_time * source_fps / AV_TIME_BASE );
 613
 614                                 int last_position = mlt_properties_get_int( properties, "_last_position" );
 615                                 if ( int_position == last_position )
 616                                         int_position = last_position + 1;
 617                                 mlt_properties_set_int( properties, "_last_position", int_position );
 618
 619                                 // Decode the image
 620                                 if ( must_decode || int_position >= req_position )
 621                                         ret = avcodec_decode_video( codec_context, av_frame, &got_picture, pkt.data, pkt.size );
 622
 623                                 if ( got_picture )
 624                                 {
 625                                         // Handle ignore
 626                                         if ( int_position < req_position )
 627                                         {
 628                                                 ignore = 0;
 629                                                 got_picture = 0;
 630                                         }
 631                                         else if ( int_position >= req_position )
 632                                         {
 633                                                 ignore = 0;
 634                                         }
 635                                         else if ( ignore -- )
 636                                         {
 637                                                 got_picture = 0;
 638                                         }
 639                                 }
 640                         }
 641
 642                         // Now handle the picture if we have one
 643                         if ( got_picture )
 644                         {
 645                                 mlt_properties_set_int( frame_properties, "progressive", !av_frame->interlaced_frame );
 646                                 mlt_properties_set_int( frame_properties, "top_field_first", av_frame->top_field_first );
 647                                 convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
 648                                 mlt_properties_set_data( frame_properties, "image", *buffer, size, (mlt_destructor)mlt_pool_release, NULL );
 649                                 mlt_properties_set_double( properties, "_current_position", int_position );
 650                         }
 651
 652                         // We're finished with this packet regardless
 653                         av_free_packet( &pkt );
 654                 }
 655         }
 656
 657         // Very untidy - for rawvideo, the packet contains the frame, hence the free packet
 658         // above will break the pause behaviour - so we wipe the frame now
 659         if ( !strcmp( codec_context->codec->name, "rawvideo" ) )
 660                 mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
 661
 662         // Set the field order property for this frame
 663         mlt_properties_set_int( frame_properties, "top_field_first", mlt_properties_get_int( properties, "top_field_first" ) );
 664
 665         // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
 666         mlt_properties_set_position( properties, "_video_expected", position + 1 );
 667
 668         return 0;
 669 }
 670
 671 /** Set up video handling.
 672 */
 673
 674 static void producer_set_up_video( mlt_producer this, mlt_frame frame )
 675 {
 676         // Get the properties
 677         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 678
 679         // Fetch the video_context
 680         AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
 681
 682         // Get the video_index
 683         int index = mlt_properties_get_int( properties, "video_index" );
 684
 685         // Get the frame properties
 686         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 687
 688         if ( context != NULL && index != -1 )
 689         {
 690                 // Get the video stream
 691                 AVStream *stream = context->streams[ index ];
 692
 693                 // Get codec context
 694                 AVCodecContext *codec_context = stream->codec;
 695
 696                 // Get the codec
 697                 AVCodec *codec = mlt_properties_get_data( properties, "video_codec", NULL );
 698
 699                 // Initialise the codec if necessary
 700                 if ( codec == NULL )
 701                 {
 702                         // Find the codec
 703                         codec = avcodec_find_decoder( codec_context->codec_id );
 704
 705                         // If we don't have a codec and we can't initialise it, we can't do much more...
 706                         if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
 707                         {
 708                                 // Now store the codec with its destructor
 709                                 mlt_properties_set_data( properties, "video_codec", codec_context, 0, producer_codec_close, NULL );
 710                         }
 711                         else
 712                         {
 713                                 // Remember that we can't use this later
 714                                 mlt_properties_set_int( properties, "video_index", -1 );
 715                         }
 716                 }
 717
 718                 // No codec, no show...
 719                 if ( codec != NULL )
 720                 {
 721                         double source_fps = 0;
 722                         int norm_aspect_ratio = mlt_properties_get_int( properties, "norm_aspect_ratio" );
 723                         double force_aspect_ratio = mlt_properties_get_double( properties, "force_aspect_ratio" );
 724                         double aspect_ratio;
 725
 726                         // XXX: We won't know the real aspect ratio until an image is decoded
 727                         // but we do need it now (to satisfy filter_resize) - take a guess based
 728                         // on pal/ntsc
 729                         if ( force_aspect_ratio > 0.0 )
 730                         {
 731                                 aspect_ratio = force_aspect_ratio;
 732                         }
 733                         else if ( !norm_aspect_ratio && codec_context->sample_aspect_ratio.num > 0 )
 734                         {
 735                                 aspect_ratio = av_q2d( codec_context->sample_aspect_ratio );
 736                         }
 737                         else
 738                         {
 739                                 int is_pal = mlt_properties_get_double( properties, "fps" ) == 25.0;
 740                                 aspect_ratio = is_pal ? 59.0/54.0 : 10.0/11.0;
 741                         }
 742
 743                         // Determine the fps
 744                         source_fps = ( double )codec_context->time_base.den / ( codec_context->time_base.num == 0 ? 1 : codec_context->time_base.num );
 745
 746                         // We'll use fps if it's available
 747                         if ( source_fps > 0 && source_fps < 30 )
 748                                 mlt_properties_set_double( properties, "source_fps", source_fps );
 749                         else
 750                                 mlt_properties_set_double( properties, "source_fps", mlt_properties_get_double( properties, "fps" ) );
 751                         mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
 752
 753                         // Set the width and height
 754                         mlt_properties_set_int( frame_properties, "width", codec_context->width );
 755                         mlt_properties_set_int( frame_properties, "height", codec_context->height );
 756                         mlt_properties_set_double( frame_properties, "aspect_ratio", aspect_ratio );
 757
 758                         mlt_frame_push_get_image( frame, producer_get_image );
 759                         mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
 760                 }
 761                 else
 762                 {
 763                         mlt_properties_set_int( frame_properties, "test_image", 1 );
 764                 }
 765         }
 766         else
 767         {
 768                 mlt_properties_set_int( frame_properties, "test_image", 1 );
 769         }
 770 }
 771
 772 /** Get the audio from a frame.
 773 */
 774
 775 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 776 {
 777         // Get the properties from the frame
 778         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 779
 780         // Obtain the frame number of this frame
 781         mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
 782
 783         // Get the producer
 784         mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
 785
 786         // Get the producer properties
 787         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 788
 789         // Fetch the audio_context
 790         AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
 791
 792         // Get the audio_index
 793         int index = mlt_properties_get_int( properties, "audio_index" );
 794
 795         // Get the seekable status
 796         int seekable = mlt_properties_get_int( properties, "seekable" );
 797
 798         // Obtain the expected frame numer
 799         mlt_position expected = mlt_properties_get_position( properties, "_audio_expected" );
 800
 801         // Obtain the resample context if it exists (not always needed)
 802         ReSampleContext *resample = mlt_properties_get_data( properties, "audio_resample", NULL );
 803
 804         // Obtain the audio buffer
 805         int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
 806
 807         // Get amount of audio used
 808         int audio_used =  mlt_properties_get_int( properties, "_audio_used" );
 809
 810         // Calculate the real time code
 811         double real_timecode = producer_time_of_frame( this, position );
 812
 813         // Get the audio stream
 814         AVStream *stream = context->streams[ index ];
 815
 816         // Get codec context
 817         AVCodecContext *codec_context = stream->codec;
 818
 819         // Packet
 820         AVPacket pkt;
 821
 822         // Number of frames to ignore (for ffwd)
 823         int ignore = 0;
 824
 825         // Flag for paused (silence)
 826         int paused = 0;
 827
 828         // Check for resample and create if necessary
 829         if ( resample == NULL && codec_context->channels <= 2 )
 830         {
 831                 // Create the resampler
 832                 resample = audio_resample_init( *channels, codec_context->channels, *frequency, codec_context->sample_rate );
 833
 834                 // And store it on properties
 835                 mlt_properties_set_data( properties, "audio_resample", resample, 0, ( mlt_destructor )audio_resample_close, NULL );
 836         }
 837         else if ( resample == NULL )
 838         {
 839                 *channels = codec_context->channels;
 840                 *frequency = codec_context->sample_rate;
 841         }
 842
 843         // Check for audio buffer and create if necessary
 844         if ( audio_buffer == NULL )
 845         {
 846                 // Allocate the audio buffer
 847                 audio_buffer = mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
 848
 849                 // And store it on properties for reuse
 850                 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
 851         }
 852
 853         // Seek if necessary
 854         if ( position != expected )
 855         {
 856                 if ( position + 1 == expected )
 857                 {
 858                         // We're paused - silence required
 859                         paused = 1;
 860                 }
 861                 else if ( !seekable && position > expected && ( position - expected ) < 250 )
 862                 {
 863                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
 864                         ignore = position - expected;
 865                 }
 866                 else if ( position < expected || position - expected >= 12 )
 867                 {
 868                         // Set to the real timecode
 869                         if ( av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ) + real_timecode * 1000000.0, AVSEEK_FLAG_BACKWARD ) != 0 )
 870                                 paused = 1;
 871
 872                         // Clear the usage in the audio buffer
 873                         audio_used = 0;
 874                 }
 875         }
 876
 877         // Get the audio if required
 878         if ( !paused )
 879         {
 880                 int ret = 0;
 881                 int got_audio = 0;
 882                 int16_t *temp = mlt_pool_alloc( sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE );
 883
 884                 av_init_packet( &pkt );
 885
 886                 while( ret >= 0 && !got_audio )
 887                 {
 888                         // Check if the buffer already contains the samples required
 889                         if ( audio_used >= *samples && ignore == 0 )
 890                         {
 891                                 got_audio = 1;
 892                                 break;
 893                         }
 894
 895                         // Read a packet
 896                         ret = av_read_frame( context, &pkt );
 897
 898                 int len = pkt.size;
 899                 uint8_t *ptr = pkt.data;
 900                         int data_size;
 901
 902                         // We only deal with audio from the selected audio_index
 903                         while ( ptr != NULL && ret >= 0 && pkt.stream_index == index && len > 0 )
 904                         {
 905                                 // Decode the audio
 906                                 ret = avcodec_decode_audio( codec_context, temp, &data_size, ptr, len );
 907
 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                 mlt_pool_release( 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 }