git.sesse.net Git - mlt/blob - src/modules/dv/producer_libdv.c

   1 /*
   2  * producer_libdv.c -- simple libdv test case
   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 #include "producer_libdv.h"
  22 #include <framework/mlt_frame.h>
  23 #include <framework/mlt_deque.h>
  24 #include <framework/mlt_factory.h>
  25 #include <pthread.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <stdio.h>
  29 #include <libdv/dv.h>
  30 #include <unistd.h>
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33 #include <fcntl.h>
  34
  35 /** To conserve resources, we maintain a stack of dv decoders.
  36 */
  37
  38 static pthread_mutex_t decoder_lock = PTHREAD_MUTEX_INITIALIZER;
  39 static mlt_properties dv_decoders = NULL;
  40
  41 dv_decoder_t *dv_decoder_alloc( )
  42 {
  43         // We'll return a dv_decoder
  44         dv_decoder_t *this = NULL;
  45
  46         // Lock the mutex
  47         pthread_mutex_lock( &decoder_lock );
  48
  49         // Create the properties if necessary
  50         if ( dv_decoders == NULL )
  51         {
  52                 // Create the properties
  53                 dv_decoders = mlt_properties_new( );
  54
  55                 // Create the stack
  56                 mlt_properties_set_data( dv_decoders, "stack", mlt_deque_init( ), 0, ( mlt_destructor )mlt_deque_close, NULL );
  57
  58                 // Register the properties for clean up
  59                 mlt_factory_register_for_clean_up( dv_decoders, ( mlt_destructor )mlt_properties_close );
  60         }
  61
  62         // Now try to obtain a decoder
  63         if ( dv_decoders != NULL )
  64         {
  65                 // Obtain the stack
  66                 mlt_deque stack = mlt_properties_get_data( dv_decoders, "stack", NULL );
  67
  68                 // Pop the top of the stack
  69                 this = mlt_deque_pop_back( stack );
  70
  71                 // Create a new decoder if none available
  72                 if ( this == NULL )
  73                 {
  74                         // We'll need a unique property ID for this
  75                         char label[ 256 ];
  76
  77                         // Configure the decoder
  78                         this = dv_decoder_new( FALSE, FALSE, FALSE );
  79                         this->quality = DV_QUALITY_COLOR | DV_QUALITY_AC_1;
  80                         this->audio->arg_audio_emphasis = 2;
  81                         dv_set_audio_correction( this, DV_AUDIO_CORRECT_AVERAGE );
  82
  83                         // Register it with the properties to ensure clean up
  84                         sprintf( label, "%p", this );
  85                         mlt_properties_set_data( dv_decoders, label, this, 0, ( mlt_destructor )dv_decoder_free, NULL );
  86                 }
  87         }
  88
  89         // Unlock the mutex
  90         pthread_mutex_unlock( &decoder_lock );
  91
  92         return this;
  93 }
  94
  95 void dv_decoder_return( dv_decoder_t *this )
  96 {
  97         // Lock the mutex
  98         pthread_mutex_lock( &decoder_lock );
  99
 100         // Now try to return the decoder
 101         if ( dv_decoders != NULL )
 102         {
 103                 // Obtain the stack
 104                 mlt_deque stack = mlt_properties_get_data( dv_decoders, "stack", NULL );
 105
 106                 // Push it back
 107                 mlt_deque_push_back( stack, this );
 108         }
 109
 110         // Unlock the mutex
 111         pthread_mutex_unlock( &decoder_lock );
 112 }
 113
 114
 115 typedef struct producer_libdv_s *producer_libdv;
 116
 117 struct producer_libdv_s
 118 {
 119         struct mlt_producer_s parent;
 120         int fd;
 121         int is_pal;
 122         uint64_t file_size;
 123         int frame_size;
 124         long frames_in_file;
 125 };
 126
 127 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
 128 static void producer_close( mlt_producer parent );
 129
 130 static int producer_collect_info( producer_libdv this );
 131
 132 mlt_producer producer_libdv_init( char *filename )
 133 {
 134         producer_libdv this = calloc( sizeof( struct producer_libdv_s ), 1 );
 135
 136         if ( filename != NULL && this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
 137         {
 138                 mlt_producer producer = &this->parent;
 139                 mlt_properties properties = mlt_producer_properties( producer );
 140
 141                 // Register transport implementation with the producer
 142                 producer->close = ( mlt_destructor )producer_close;
 143
 144                 // Register our get_frame implementation with the producer
 145                 producer->get_frame = producer_get_frame;
 146
 147                 // Open the file if specified
 148                 this->fd = open( filename, O_RDONLY );
 149
 150                 // Collect info
 151                 if ( this->fd != -1 && producer_collect_info( this ) )
 152                 {
 153                         // Set the resource property (required for all producers)
 154                         mlt_properties_set( properties, "resource", filename );
 155                 }
 156                 else
 157                 {
 158                         // Reject this file
 159                         mlt_producer_close( producer );
 160                         producer = NULL;
 161                 }
 162
 163                 // Return the producer
 164                 return producer;
 165         }
 166         free( this );
 167         return NULL;
 168 }
 169
 170 static int read_frame( int fd, uint8_t* frame_buf, int *isPAL )
 171 {
 172         int result = read( fd, frame_buf, FRAME_SIZE_525_60 ) == FRAME_SIZE_525_60;
 173         if ( result )
 174         {
 175                 *isPAL = ( frame_buf[3] & 0x80 );
 176
 177                 if ( *isPAL )
 178                 {
 179                         int diff = FRAME_SIZE_625_50 - FRAME_SIZE_525_60;
 180                         result = read( fd, frame_buf + FRAME_SIZE_525_60, diff ) == diff;
 181                 }
 182         }
 183
 184         return result;
 185 }
 186
 187 static int producer_collect_info( producer_libdv this )
 188 {
 189         int valid = 0;
 190
 191         uint8_t *dv_data = mlt_pool_alloc( FRAME_SIZE_625_50 );
 192
 193         if ( dv_data != NULL )
 194         {
 195                 // Read the first frame
 196                 valid = read_frame( this->fd, dv_data, &this->is_pal );
 197
 198                 // If it looks like a valid frame, the get stats
 199                 if ( valid )
 200                 {
 201                         // Get the properties
 202                         mlt_properties properties = mlt_producer_properties( &this->parent );
 203
 204                         // Get a dv_decoder
 205                         dv_decoder_t *dv_decoder = dv_decoder_alloc( );
 206
 207                         // Determine the file size
 208                         struct stat buf;
 209                         fstat( this->fd, &buf );
 210
 211                         // Store the file size
 212                         this->file_size = buf.st_size;
 213
 214                         // Determine the frame size
 215                         this->frame_size = this->is_pal ? FRAME_SIZE_625_50 : FRAME_SIZE_525_60;
 216
 217                         // Determine the number of frames in the file
 218                         this->frames_in_file = this->file_size / this->frame_size;
 219
 220                         // Calculate default in/out points
 221                         double fps = this->is_pal ? 25 : 30000.0 / 1001.0;
 222                         if ( mlt_properties_get_double( properties, "fps" ) == fps )
 223                         {
 224                                 mlt_properties_set_position( properties, "length", this->frames_in_file );
 225                                 mlt_properties_set_position( properties, "in", 0 );
 226                                 mlt_properties_set_position( properties, "out", this->frames_in_file - 1 );
 227                         }
 228                         else
 229                         {
 230                                 valid = 0;
 231                         }
 232
 233                         // Parse the header for meta info
 234                         dv_parse_header( dv_decoder, dv_data );
 235                         mlt_properties_set_double( properties, "aspect_ratio",
 236                                 dv_format_wide( dv_decoder ) ? ( this->is_pal ? 512.0/351.0 : 96.0/79.0 ) : ( this->is_pal ? 128.0/117.0 : 72.0/79.0 ) );
 237
 238                         // Return the decoder
 239                         dv_decoder_return( dv_decoder );
 240                 }
 241
 242                 mlt_pool_release( dv_data );
 243         }
 244
 245         return valid;
 246 }
 247
 248 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 249 {
 250         int pitches[3] = { 0, 0, 0 };
 251         uint8_t *pixels[3] = { NULL, NULL, NULL };
 252
 253         // Get the frames properties
 254         mlt_properties properties = mlt_frame_properties( this );
 255
 256         // Get a dv_decoder
 257         dv_decoder_t *decoder = dv_decoder_alloc( );
 258
 259         // Get the dv data
 260         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
 261
 262         // Get and set the quality request
 263         char *quality = mlt_frame_pop_service( this );
 264
 265         if ( quality != NULL )
 266         {
 267                 if ( strncmp( quality, "fast", 4 ) == 0 )
 268                         decoder->quality = ( DV_QUALITY_COLOR | DV_QUALITY_DC );
 269                 else if ( strncmp( quality, "best", 4 ) == 0 )
 270                         decoder->quality = ( DV_QUALITY_COLOR | DV_QUALITY_AC_2 );
 271                 else
 272                         decoder->quality = ( DV_QUALITY_COLOR | DV_QUALITY_AC_1 );
 273         }
 274
 275         // Parse the header for meta info
 276         dv_parse_header( decoder, dv_data );
 277
 278         // Assign width and height from properties
 279         *width = mlt_properties_get_int( properties, "width" );
 280         *height = mlt_properties_get_int( properties, "height" );
 281
 282         // Extract an image of the format requested
 283         if ( *format == mlt_image_yuv422 )
 284         {
 285                 // Allocate an image
 286                 uint8_t *image = mlt_pool_alloc( *width * ( *height + 1 ) * 2 );
 287
 288                 // Pass to properties for clean up
 289                 mlt_properties_set_data( properties, "image", image, *width * ( *height + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
 290
 291                 // Decode the image
 292                 pitches[ 0 ] = *width * 2;
 293                 pixels[ 0 ] = image;
 294                 dv_decode_full_frame( decoder, dv_data, e_dv_color_yuv, pixels, pitches );
 295
 296                 // Assign result
 297                 *buffer = image;
 298         }
 299         else if ( *format == mlt_image_rgb24 )
 300         {
 301                 // Allocate an image
 302                 uint8_t *image = mlt_pool_alloc( *width * ( *height + 1 ) * 3 );
 303
 304                 // Pass to properties for clean up
 305                 mlt_properties_set_data( properties, "image", image, *width * ( *height + 1 ) * 3, ( mlt_destructor )mlt_pool_release, NULL );
 306
 307                 // Decode the frame
 308                 pitches[ 0 ] = 720 * 3;
 309                 pixels[ 0 ] = image;
 310                 dv_decode_full_frame( decoder, dv_data, e_dv_color_rgb, pixels, pitches );
 311
 312                 // Assign result
 313                 *buffer = image;
 314         }
 315
 316         // Return the decoder
 317         dv_decoder_return( decoder );
 318
 319         return 0;
 320 }
 321
 322 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 323 {
 324         int16_t *p;
 325         int i, j;
 326         int16_t *audio_channels[ 4 ];
 327
 328         // Get the frames properties
 329         mlt_properties properties = mlt_frame_properties( this );
 330
 331         // Get a dv_decoder
 332         dv_decoder_t *decoder = dv_decoder_alloc( );
 333
 334         // Get the dv data
 335         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
 336
 337         // Parse the header for meta info
 338         dv_parse_header( decoder, dv_data );
 339
 340         // Check that we have audio
 341         if ( decoder->audio->num_channels > 0 )
 342         {
 343                 // Obtain required values
 344                 *frequency = decoder->audio->frequency;
 345                 *samples = decoder->audio->samples_this_frame;
 346                 *channels = decoder->audio->num_channels;
 347
 348                 // Create a temporary workspace
 349                 for ( i = 0; i < 4; i++ )
 350                         audio_channels[ i ] = mlt_pool_alloc( DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
 351
 352                 // Create a workspace for the result
 353                 *buffer = mlt_pool_alloc( *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
 354
 355                 // Pass the allocated audio buffer as a property
 356                 mlt_properties_set_data( properties, "audio", *buffer, *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ), ( mlt_destructor )mlt_pool_release, NULL );
 357
 358                 // Decode the audio
 359                 dv_decode_full_audio( decoder, dv_data, audio_channels );
 360
 361                 // Interleave the audio
 362                 p = *buffer;
 363                 for ( i = 0; i < *samples; i++ )
 364                         for ( j = 0; j < *channels; j++ )
 365                                 *p++ = audio_channels[ j ][ i ];
 366
 367                 // Free the temporary work space
 368                 for ( i = 0; i < 4; i++ )
 369                         mlt_pool_release( audio_channels[ i ] );
 370         }
 371         else
 372         {
 373                 // No audio available on the frame, so get test audio (silence)
 374                 this->get_audio = NULL;
 375                 mlt_frame_get_audio( this, buffer, format, frequency, channels, samples );
 376         }
 377
 378         // Return the decoder
 379         dv_decoder_return( decoder );
 380
 381         return 0;
 382 }
 383
 384 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 385 {
 386         producer_libdv this = producer->child;
 387         uint8_t *data = mlt_pool_alloc( FRAME_SIZE_625_50 );
 388
 389         // Obtain the current frame number
 390         uint64_t position = mlt_producer_frame( producer );
 391
 392         // Convert timecode to a file position (ensuring that we're on a frame boundary)
 393         uint64_t offset = position * this->frame_size;
 394
 395         // Create an empty frame
 396         *frame = mlt_frame_init( );
 397
 398         // Seek and fetch
 399         if ( this->fd != 0 &&
 400                  lseek( this->fd, offset, SEEK_SET ) == offset &&
 401                  read_frame( this->fd, data, &this->is_pal ) )
 402         {
 403                 // Get the frames properties
 404                 mlt_properties properties = mlt_frame_properties( *frame );
 405
 406                 // Get a dv_decoder
 407                 dv_decoder_t *dv_decoder = dv_decoder_alloc( );
 408
 409                 // Pass the dv data
 410                 mlt_properties_set_data( properties, "dv_data", data, FRAME_SIZE_625_50, ( mlt_destructor )mlt_pool_release, NULL );
 411
 412                 // Update other info on the frame
 413                 mlt_properties_set_int( properties, "width", 720 );
 414                 mlt_properties_set_int( properties, "height", this->is_pal ? 576 : 480 );
 415                 mlt_properties_set_int( properties, "top_field_first", 0 );
 416
 417                 // Parse the header for meta info
 418                 dv_parse_header( dv_decoder, data );
 419                 mlt_properties_set_int( properties, "progressive", dv_is_progressive( dv_decoder ) );
 420                 mlt_properties_set_double( properties, "aspect_ratio",
 421                         dv_format_wide( dv_decoder ) ? ( this->is_pal ? 512.0/351.0 : 96.0/79.0 ) : ( this->is_pal ? 128.0/117.0 : 72.0/79.0 ) );
 422
 423                 // Hmm - register audio callback
 424                 ( *frame )->get_audio = producer_get_audio;
 425
 426                 // Push the quality string
 427                 mlt_frame_push_service( *frame, mlt_properties_get( mlt_producer_properties( producer ), "quality" ) );
 428
 429                 // Push the get_image method on to the stack
 430                 mlt_frame_push_get_image( *frame, producer_get_image );
 431
 432                 // Return the decoder
 433                 dv_decoder_return( dv_decoder );
 434         }
 435         else
 436         {
 437                 mlt_pool_release( data );
 438         }
 439
 440         // Update timecode on the frame we're creating
 441         mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 442
 443         // Calculate the next timecode
 444         mlt_producer_prepare_next( producer );
 445
 446         return 0;
 447 }
 448
 449 static void producer_close( mlt_producer parent )
 450 {
 451         // Obtain this
 452         producer_libdv this = parent->child;
 453
 454         // Close the file
 455         if ( this->fd > 0 )
 456                 close( this->fd );
 457
 458         // Close the parent
 459         parent->close = NULL;
 460         mlt_producer_close( parent );
 461
 462         // Free the memory
 463         free( this );
 464 }