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                         // BUG: dv_decoder_free core dumps here
  85                         sprintf( label, "%p", this );
  86                         //mlt_properties_set_data( dv_decoders, label, this, 0, ( mlt_destructor )dv_decoder_free, NULL );
  87                         mlt_properties_set_data( dv_decoders, label, this, 0, NULL, NULL );
  88                 }
  89         }
  90
  91         // Unlock the mutex
  92         pthread_mutex_unlock( &decoder_lock );
  93
  94         return this;
  95 }
  96
  97 void dv_decoder_return( dv_decoder_t *this )
  98 {
  99         // Lock the mutex
 100         pthread_mutex_lock( &decoder_lock );
 101
 102         // Now try to return the decoder
 103         if ( dv_decoders != NULL )
 104         {
 105                 // Obtain the stack
 106                 mlt_deque stack = mlt_properties_get_data( dv_decoders, "stack", NULL );
 107
 108                 // Push it back
 109                 mlt_deque_push_back( stack, this );
 110         }
 111
 112         // Unlock the mutex
 113         pthread_mutex_unlock( &decoder_lock );
 114 }
 115
 116
 117 typedef struct producer_libdv_s *producer_libdv;
 118
 119 struct producer_libdv_s
 120 {
 121         struct mlt_producer_s parent;
 122         int fd;
 123         int is_pal;
 124         uint64_t file_size;
 125         int frame_size;
 126         long frames_in_file;
 127 };
 128
 129 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
 130 static void producer_close( mlt_producer parent );
 131
 132 static int producer_collect_info( producer_libdv this );
 133
 134 mlt_producer producer_libdv_init( char *filename )
 135 {
 136         producer_libdv this = calloc( sizeof( struct producer_libdv_s ), 1 );
 137
 138         if ( filename != NULL && this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
 139         {
 140                 mlt_producer producer = &this->parent;
 141                 mlt_properties properties = mlt_producer_properties( producer );
 142
 143                 // Register transport implementation with the producer
 144                 producer->close = producer_close;
 145
 146                 // Register our get_frame implementation with the producer
 147                 producer->get_frame = producer_get_frame;
 148
 149                 // Open the file if specified
 150                 this->fd = open( filename, O_RDONLY );
 151
 152                 // Collect info
 153                 if ( this->fd != -1 && producer_collect_info( this ) )
 154                 {
 155                         // Set the resource property (required for all producers)
 156                         mlt_properties_set( properties, "resource", filename );
 157                 }
 158                 else
 159                 {
 160                         // Reject this file
 161                         mlt_producer_close( producer );
 162                         producer = NULL;
 163                 }
 164
 165                 // Return the producer
 166                 return producer;
 167         }
 168         free( this );
 169         return NULL;
 170 }
 171
 172 static int read_frame( int fd, uint8_t* frame_buf, int *isPAL )
 173 {
 174         int result = read( fd, frame_buf, frame_size_525_60 ) == frame_size_525_60;
 175         if ( result )
 176         {
 177                 *isPAL = ( frame_buf[3] & 0x80 );
 178
 179                 if ( *isPAL )
 180                 {
 181                         int diff = frame_size_625_50 - frame_size_525_60;
 182                         result = read( fd, frame_buf + frame_size_525_60, diff ) == diff;
 183                 }
 184         }
 185
 186         return result;
 187 }
 188
 189 static int producer_collect_info( producer_libdv this )
 190 {
 191         int valid = 0;
 192
 193         uint8_t *dv_data = mlt_pool_alloc( frame_size_625_50 );
 194
 195         if ( dv_data != NULL )
 196         {
 197                 // Read the first frame
 198                 valid = read_frame( this->fd, dv_data, &this->is_pal );
 199
 200                 // If it looks like a valid frame, the get stats
 201                 if ( valid )
 202                 {
 203                         // Get the properties
 204                         mlt_properties properties = mlt_producer_properties( &this->parent );
 205
 206                         // Get a dv_decoder
 207                         dv_decoder_t *dv_decoder = dv_decoder_alloc( );
 208
 209                         // Determine the file size
 210                         struct stat buf;
 211                         fstat( this->fd, &buf );
 212
 213                         // Store the file size
 214                         this->file_size = buf.st_size;
 215
 216                         // Determine the frame size
 217                         this->frame_size = this->is_pal ? frame_size_625_50 : frame_size_525_60;
 218
 219                         // Determine the number of frames in the file
 220                         this->frames_in_file = this->file_size / this->frame_size;
 221
 222                         // Calculate default in/out points
 223                         double fps = this->is_pal ? 25 : 30000.0 / 1001.0;
 224                         if ( mlt_properties_get_double( properties, "fps" ) == fps )
 225                         {
 226                                 mlt_properties_set_position( properties, "length", this->frames_in_file );
 227                                 mlt_properties_set_position( properties, "in", 0 );
 228                                 mlt_properties_set_position( properties, "out", this->frames_in_file - 1 );
 229                         }
 230                         else
 231                         {
 232                                 valid = 0;
 233                         }
 234
 235                         // Parse the header for meta info
 236                         dv_parse_header( dv_decoder, dv_data );
 237                         mlt_properties_set_double( properties, "aspect_ratio",
 238                                 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 ) );
 239
 240                         // Return the decoder
 241                         dv_decoder_return( dv_decoder );
 242                 }
 243
 244                 mlt_pool_release( dv_data );
 245         }
 246
 247         return valid;
 248 }
 249
 250 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 251 {
 252         int pitches[3] = { 0, 0, 0 };
 253         uint8_t *pixels[3] = { NULL, NULL, NULL };
 254
 255         // Get the frames properties
 256         mlt_properties properties = mlt_frame_properties( this );
 257
 258         // Get a dv_decoder
 259         dv_decoder_t *decoder = dv_decoder_alloc( );
 260
 261         // Get the dv data
 262         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
 263
 264         // Get and set the quality request
 265         char *quality = mlt_frame_pop_service( this );
 266
 267         if ( quality != NULL )
 268         {
 269                 if ( strncmp( quality, "fast", 4 ) == 0 )
 270                         decoder->quality = ( DV_QUALITY_COLOR | DV_QUALITY_DC );
 271                 else if ( strncmp( quality, "best", 4 ) == 0 )
 272                         decoder->quality = ( DV_QUALITY_COLOR | DV_QUALITY_AC_2 );
 273                 else
 274                         decoder->quality = ( DV_QUALITY_COLOR | DV_QUALITY_AC_1 );
 275         }
 276
 277         // Parse the header for meta info
 278         dv_parse_header( decoder, dv_data );
 279
 280         // Assign width and height from properties
 281         *width = mlt_properties_get_int( properties, "width" );
 282         *height = mlt_properties_get_int( properties, "height" );
 283
 284         // Extract an image of the format requested
 285         if ( *format == mlt_image_yuv422 )
 286         {
 287                 // Allocate an image
 288                 uint8_t *image = mlt_pool_alloc( *width * ( *height + 1 ) * 2 );
 289
 290                 // Pass to properties for clean up
 291                 mlt_properties_set_data( properties, "image", image, *width * ( *height + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
 292
 293                 // Decode the image
 294                 pitches[ 0 ] = *width * 2;
 295                 pixels[ 0 ] = image;
 296                 dv_decode_full_frame( decoder, dv_data, e_dv_color_yuv, pixels, pitches );
 297
 298                 // Assign result
 299                 *buffer = image;
 300         }
 301         else if ( *format == mlt_image_rgb24 )
 302         {
 303                 // Allocate an image
 304                 uint8_t *image = mlt_pool_alloc( *width * ( *height + 1 ) * 3 );
 305
 306                 // Pass to properties for clean up
 307                 mlt_properties_set_data( properties, "image", image, *width * ( *height + 1 ) * 3, ( mlt_destructor )mlt_pool_release, NULL );
 308
 309                 // Decode the frame
 310                 pitches[ 0 ] = 720 * 3;
 311                 pixels[ 0 ] = image;
 312                 dv_decode_full_frame( decoder, dv_data, e_dv_color_rgb, pixels, pitches );
 313
 314                 // Assign result
 315                 *buffer = image;
 316         }
 317
 318         // Return the decoder
 319         dv_decoder_return( decoder );
 320
 321         return 0;
 322 }
 323
 324 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 325 {
 326         int16_t *p;
 327         int i, j;
 328         int16_t *audio_channels[ 4 ];
 329
 330         // Get the frames properties
 331         mlt_properties properties = mlt_frame_properties( this );
 332
 333         // Get a dv_decoder
 334         dv_decoder_t *decoder = dv_decoder_alloc( );
 335
 336         // Get the dv data
 337         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
 338
 339         // Parse the header for meta info
 340         dv_parse_header( decoder, dv_data );
 341
 342         // Check that we have audio
 343         if ( decoder->audio->num_channels > 0 )
 344         {
 345                 // Obtain required values
 346                 *frequency = decoder->audio->frequency;
 347                 *samples = decoder->audio->samples_this_frame;
 348                 *channels = decoder->audio->num_channels;
 349
 350                 // Create a temporary workspace
 351                 for ( i = 0; i < 4; i++ )
 352                         audio_channels[ i ] = mlt_pool_alloc( DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
 353
 354                 // Create a workspace for the result
 355                 *buffer = mlt_pool_alloc( *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
 356
 357                 // Pass the allocated audio buffer as a property
 358                 mlt_properties_set_data( properties, "audio", *buffer, *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ), ( mlt_destructor )mlt_pool_release, NULL );
 359
 360                 // Decode the audio
 361                 dv_decode_full_audio( decoder, dv_data, audio_channels );
 362
 363                 // Interleave the audio
 364                 p = *buffer;
 365                 for ( i = 0; i < *samples; i++ )
 366                         for ( j = 0; j < *channels; j++ )
 367                                 *p++ = audio_channels[ j ][ i ];
 368
 369                 // Free the temporary work space
 370                 for ( i = 0; i < 4; i++ )
 371                         mlt_pool_release( audio_channels[ i ] );
 372         }
 373         else
 374         {
 375                 // No audio available on the frame, so get test audio (silence)
 376                 this->get_audio = NULL;
 377                 mlt_frame_get_audio( this, buffer, format, frequency, channels, samples );
 378         }
 379
 380         // Return the decoder
 381         dv_decoder_return( decoder );
 382
 383         return 0;
 384 }
 385
 386 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 387 {
 388         producer_libdv this = producer->child;
 389         uint8_t *data = mlt_pool_alloc( frame_size_625_50 );
 390
 391         // Obtain the current frame number
 392         uint64_t position = mlt_producer_frame( producer );
 393
 394         // Convert timecode to a file position (ensuring that we're on a frame boundary)
 395         uint64_t offset = position * this->frame_size;
 396
 397         // Create an empty frame
 398         *frame = mlt_frame_init( );
 399
 400         // Seek and fetch
 401         if ( this->fd != 0 &&
 402                  lseek( this->fd, offset, SEEK_SET ) == offset &&
 403                  read_frame( this->fd, data, &this->is_pal ) )
 404         {
 405                 // Get the frames properties
 406                 mlt_properties properties = mlt_frame_properties( *frame );
 407
 408                 // Get a dv_decoder
 409                 dv_decoder_t *dv_decoder = dv_decoder_alloc( );
 410
 411                 // Pass the dv data
 412                 mlt_properties_set_data( properties, "dv_data", data, frame_size_625_50, ( mlt_destructor )mlt_pool_release, NULL );
 413
 414                 // Update other info on the frame
 415                 mlt_properties_set_int( properties, "width", 720 );
 416                 mlt_properties_set_int( properties, "height", this->is_pal ? 576 : 480 );
 417                 mlt_properties_set_int( properties, "top_field_first", 0 );
 418
 419                 // Parse the header for meta info
 420                 dv_parse_header( dv_decoder, data );
 421                 mlt_properties_set_int( properties, "progressive", dv_is_progressive( dv_decoder ) );
 422                 mlt_properties_set_double( properties, "aspect_ratio",
 423                         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 ) );
 424
 425                 // Hmm - register audio callback
 426                 ( *frame )->get_audio = producer_get_audio;
 427
 428                 // Push the quality string
 429                 mlt_frame_push_service( *frame, mlt_properties_get( mlt_producer_properties( producer ), "quality" ) );
 430
 431                 // Push the get_image method on to the stack
 432                 mlt_frame_push_get_image( *frame, producer_get_image );
 433
 434                 // Return the decoder
 435                 dv_decoder_return( dv_decoder );
 436         }
 437         else
 438         {
 439                 mlt_pool_release( data );
 440         }
 441
 442         // Update timecode on the frame we're creating
 443         mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 444
 445         // Calculate the next timecode
 446         mlt_producer_prepare_next( producer );
 447
 448         return 0;
 449 }
 450
 451 static void producer_close( mlt_producer parent )
 452 {
 453         // Obtain this
 454         producer_libdv this = parent->child;
 455
 456         // Close the file
 457         if ( this->fd > 0 )
 458                 close( this->fd );
 459
 460         // Close the parent
 461         parent->close = NULL;
 462         mlt_producer_close( parent );
 463
 464         // Free the memory
 465         free( this );
 466 }