research.m1stereo.tv/gitweb/ - melted/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 <stdlib.h>
  24 #include <string.h>
  25 #include <stdio.h>
  26 #include <libdv/dv.h>
  27 #include <unistd.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <fcntl.h>
  31
  32 typedef struct producer_libdv_s *producer_libdv;
  33
  34 struct producer_libdv_s
  35 {
  36         struct mlt_producer_s parent;
  37         int fd;
  38         dv_decoder_t *dv_decoder;
  39         int is_pal;
  40         uint64_t file_size;
  41         int frame_size;
  42         long frames_in_file;
  43 };
  44
  45 static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
  46 static void producer_close( mlt_producer parent );
  47
  48 static int producer_collect_info( producer_libdv this );
  49
  50 mlt_producer producer_libdv_init( char *filename )
  51 {
  52         producer_libdv this = calloc( sizeof( struct producer_libdv_s ), 1 );
  53
  54         if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
  55         {
  56                 mlt_producer producer = &this->parent;
  57
  58                 // Register transport implementation with the producer
  59                 producer->close = producer_close;
  60
  61                 // Register our get_frame implementation with the producer
  62                 producer->get_frame = producer_get_frame;
  63
  64                 // Create the dv_decoder
  65                 this->dv_decoder = dv_decoder_new( FALSE, FALSE, FALSE );
  66                 this->dv_decoder->quality = DV_QUALITY_BEST;
  67                 this->dv_decoder->audio->arg_audio_emphasis = 2;
  68                 dv_set_audio_correction( this->dv_decoder, DV_AUDIO_CORRECT_AVERAGE );
  69
  70                 // Open the file if specified
  71                 if ( filename != NULL )
  72                 {
  73                         this->fd = open( filename, O_RDONLY );
  74                         producer_collect_info( this );
  75                 }
  76
  77                 // Return the producer
  78                 return producer;
  79         }
  80         free( this );
  81         return NULL;
  82 }
  83
  84 static int read_frame( int fd, uint8_t* frame_buf, int *isPAL )
  85 {
  86         int result = read( fd, frame_buf, frame_size_525_60 ) == frame_size_525_60;
  87         if ( result )
  88         {
  89                 *isPAL = ( frame_buf[3] & 0x80 );
  90
  91                 if ( *isPAL )
  92                 {
  93                         int diff = frame_size_625_50 - frame_size_525_60;
  94                         result = read( fd, frame_buf + frame_size_525_60, diff ) == diff;
  95                 }
  96         }
  97
  98         return result;
  99 }
 100
 101 static int producer_collect_info( producer_libdv this )
 102 {
 103         int valid = 0;
 104         uint8_t *dv_data = malloc( frame_size_625_50 );
 105
 106         if ( dv_data != NULL )
 107         {
 108                 // Read the first frame
 109                 valid = read_frame( this->fd, dv_data, &this->is_pal );
 110
 111                 // If it looks like a valid frame, the get stats
 112                 if ( valid )
 113                 {
 114                         // Get the properties
 115                         mlt_properties properties = mlt_producer_properties( &this->parent );
 116
 117                         // Determine the file size
 118                         struct stat buf;
 119                         fstat( this->fd, &buf );
 120
 121                         // Store the file size
 122                         this->file_size = buf.st_size;
 123
 124                         // Determine the frame size
 125                         this->frame_size = this->is_pal ? frame_size_625_50 : frame_size_525_60;
 126
 127                         // Determine the number of frames in the file
 128                         this->frames_in_file = this->file_size / this->frame_size;
 129
 130                         // Calculate default in/out points
 131                         double fps = this->is_pal ? 25 : 30000 / 1001;
 132                         mlt_timecode length = ( mlt_timecode )( this->frames_in_file ) / fps;
 133                         mlt_properties_set_double( properties, "fps", fps );
 134                         mlt_properties_set_timecode( properties, "playtime", length );
 135                         mlt_properties_set_timecode( properties, "length", length );
 136                         mlt_properties_set_timecode( properties, "in", 0.0 );
 137                         mlt_properties_set_timecode( properties, "out", length );
 138
 139                         // Set the speed to normal
 140                         mlt_properties_set_double( properties, "speed", 1 );
 141                 }
 142
 143                 free( dv_data );
 144         }
 145
 146         return valid;
 147 }
 148
 149 #if 0
 150 static int mc_producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 151 {
 152         // Get the frames properties
 153         mlt_properties properties = mlt_frame_properties( this );
 154
 155         // Get the dv data
 156         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
 157
 158         // Determine bytes in frame
 159         int bytes_in_frame = dv_data[ 3 ] & 0x80 ? frame_size_625_50 : frame_size_525_60;
 160
 161         // Assign width and height from properties
 162         *width = mlt_properties_get_int( properties, "width" );
 163         *height = mlt_properties_get_int( properties, "height" );
 164
 165         if ( *format == mlt_image_yuv422 )
 166         {
 167                 // Allocate image
 168                 *buffer = malloc( *width * *height * 2 );
 169
 170                 // Decompress
 171                 DecompressBuffer_DV( dv_data, bytes_in_frame, *buffer, *width * 2, *width, *height, 0, FOURCC_YUYV, 0, NULL );
 172
 173                 // Set the image on the properties
 174                 mlt_properties_set_data( properties, "image", *buffer, *width * *height * 2, free, NULL );
 175         }
 176         else
 177         {
 178                 // Allocate image
 179                 *buffer = malloc( *width * *height * 3 );
 180
 181                 // Decompress
 182                 DecompressBuffer_DV( dv_data, bytes_in_frame, *buffer, *width * 3, *width, *height, 0, FOURCC_R24C, 0, NULL );
 183
 184                 // Set the image on the properties
 185                 mlt_properties_set_data( properties, "image", *buffer, *width * *height * 2, free, NULL );
 186         }
 187
 188         return 0;
 189 }
 190 #endif
 191
 192 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 193 {
 194         int pitches[3] = { 0, 0, 0 };
 195         uint8_t *pixels[3] = { NULL, NULL, NULL };
 196
 197         // Get the frames properties
 198         mlt_properties properties = mlt_frame_properties( this );
 199
 200         // Get the dv decoder
 201         dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
 202
 203         // Get the dv data
 204         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
 205
 206         // Assign width and height from properties
 207         *width = mlt_properties_get_int( properties, "width" );
 208         *height = mlt_properties_get_int( properties, "height" );
 209
 210         // Parse the header
 211         dv_parse_header( decoder, dv_data );
 212
 213         // Extract an image of the format requested
 214         if ( *format == mlt_image_yuv422 )
 215         {
 216                 // Allocate an image
 217                 uint8_t *image = malloc( *width * *height * 2 );
 218
 219                 // Pass to properties for clean up
 220                 mlt_properties_set_data( properties, "image", image, *width * *height * 2, free, NULL );
 221
 222                 // Decode the image
 223                 pitches[ 0 ] = *width * 2;
 224                 pixels[ 0 ] = image;
 225                 dv_decode_full_frame( decoder, dv_data, e_dv_color_yuv, pixels, pitches );
 226
 227                 // Assign result
 228                 *buffer = image;
 229         }
 230         else if ( *format == mlt_image_rgb24 )
 231         {
 232                 // Allocate an image
 233                 uint8_t *image = malloc( *width * *height * 3 );
 234
 235                 // Pass to properties for clean up
 236                 mlt_properties_set_data( properties, "image", image, *width * *height * 3, free, NULL );
 237
 238                 // Decode the frame
 239                 pitches[ 0 ] = 720 * 3;
 240                 pixels[ 0 ] = image;
 241                 dv_decode_full_frame( decoder, dv_data, e_dv_color_rgb, pixels, pitches );
 242
 243                 // Assign result
 244                 *buffer = image;
 245         }
 246
 247         return 0;
 248 }
 249
 250 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 251 {
 252         int16_t *p;
 253         int i, j;
 254         int16_t *audio_channels[ 4 ];
 255
 256         // Get the frames properties
 257         mlt_properties properties = mlt_frame_properties( this );
 258
 259         // Get the dv decoder
 260         dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
 261
 262         // Get the dv data
 263         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
 264
 265         // Parse the header for meta info
 266         dv_parse_header( decoder, dv_data );
 267
 268         // Obtain required values
 269         *frequency = decoder->audio->frequency;
 270         *samples = decoder->audio->samples_this_frame;
 271         *channels = decoder->audio->num_channels;
 272
 273         // Create a temporary workspace
 274         for ( i = 0; i < 4; i++ )
 275                 audio_channels[ i ] = malloc( DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
 276
 277         // Create a workspace for the result
 278         *buffer = malloc( *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
 279
 280         // Pass the allocated audio buffer as a property
 281         mlt_properties_set_data( properties, "audio", *buffer, *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ), free, NULL );
 282
 283         // Decode the audio
 284         dv_decode_full_audio( decoder, dv_data, audio_channels );
 285
 286         // Interleave the audio
 287         p = *buffer;
 288         for ( i = 0; i < *samples; i++ )
 289                 for ( j = 0; j < *channels; j++ )
 290                         *p++ = audio_channels[ j ][ i ];
 291
 292         // Free the temporary work space
 293         for ( i = 0; i < 4; i++ )
 294                 free( audio_channels[ i ] );
 295
 296         return 0;
 297 }
 298
 299 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 300 {
 301         producer_libdv this = producer->child;
 302         uint8_t *data = malloc( frame_size_625_50 );
 303
 304         // Obtain the current frame number
 305         uint64_t position = mlt_producer_frame( producer );
 306
 307         // Convert timecode to a file position (ensuring that we're on a frame boundary)
 308         uint64_t offset = position * this->frame_size;
 309
 310         // Create an empty frame
 311         *frame = mlt_frame_init( );
 312
 313         // Seek and fetch
 314         if ( this->fd != 0 &&
 315                  lseek( this->fd, offset, SEEK_SET ) == offset &&
 316                  read_frame( this->fd, data, &this->is_pal ) )
 317         {
 318                 // Get the frames properties
 319                 mlt_properties properties = mlt_frame_properties( *frame );
 320
 321                 // Pass the dv decoder
 322                 mlt_properties_set_data( properties, "dv_decoder", this->dv_decoder, 0, NULL, NULL );
 323
 324                 // Pass the dv data
 325                 mlt_properties_set_data( properties, "dv_data", data, frame_size_625_50, free, NULL );
 326
 327                 // Update other info on the frame
 328                 mlt_properties_set_int( properties, "width", 720 );
 329                 mlt_properties_set_int( properties, "height", this->is_pal ? 576 : 480 );
 330
 331                 // Hmm - register audio callback
 332                 ( *frame )->get_audio = producer_get_audio;
 333
 334                 // Push the get_image method on to the stack
 335                 mlt_frame_push_get_image( *frame, producer_get_image );
 336         }
 337         else
 338         {
 339                 free( data );
 340         }
 341
 342         // Update timecode on the frame we're creating
 343         mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );
 344
 345         // Calculate the next timecode
 346         mlt_producer_prepare_next( producer );
 347
 348         return 0;
 349 }
 350
 351 static void producer_close( mlt_producer parent )
 352 {
 353         // Obtain this
 354         producer_libdv this = parent->child;
 355
 356         // Free the dv deconder
 357         dv_decoder_free( this->dv_decoder );
 358
 359         // Close the file
 360         if ( this->fd != 0 )
 361                 close( this->fd );
 362
 363         // Close the parent
 364         parent->close = NULL;
 365         mlt_producer_close( parent );
 366
 367         // Free the memory
 368         free( this );
 369 }
 370