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 ( filename != NULL && this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
  55         {
  56                 mlt_producer producer = &this->parent;
  57                 mlt_properties properties = mlt_producer_properties( producer );
  58
  59                 // Register transport implementation with the producer
  60                 producer->close = producer_close;
  61
  62                 // Register our get_frame implementation with the producer
  63                 producer->get_frame = producer_get_frame;
  64
  65                 // Create the dv_decoder
  66                 this->dv_decoder = dv_decoder_new( FALSE, FALSE, FALSE );
  67                 this->dv_decoder->quality = DV_QUALITY_BEST;
  68                 this->dv_decoder->audio->arg_audio_emphasis = 2;
  69                 dv_set_audio_correction( this->dv_decoder, DV_AUDIO_CORRECT_AVERAGE );
  70
  71                 // Open the file if specified
  72                 this->fd = open( filename, O_RDONLY );
  73
  74                 // Collect info
  75                 if ( this->fd != -1 && producer_collect_info( this ) )
  76                 {
  77                         // Set the resource property (required for all producers)
  78                         mlt_properties_set( properties, "resource", filename );
  79                 }
  80                 else
  81                 {
  82                         // Reject this file
  83                         mlt_producer_close( producer );
  84                         producer = NULL;
  85                 }
  86
  87                 // Return the producer
  88                 return producer;
  89         }
  90         free( this );
  91         return NULL;
  92 }
  93
  94 static int read_frame( int fd, uint8_t* frame_buf, int *isPAL )
  95 {
  96         int result = read( fd, frame_buf, frame_size_525_60 ) == frame_size_525_60;
  97         if ( result )
  98         {
  99                 *isPAL = ( frame_buf[3] & 0x80 );
 100
 101                 if ( *isPAL )
 102                 {
 103                         int diff = frame_size_625_50 - frame_size_525_60;
 104                         result = read( fd, frame_buf + frame_size_525_60, diff ) == diff;
 105                 }
 106         }
 107
 108         return result;
 109 }
 110
 111 static int producer_collect_info( producer_libdv this )
 112 {
 113         int valid = 0;
 114         uint8_t *dv_data = malloc( frame_size_625_50 );
 115
 116         if ( dv_data != NULL )
 117         {
 118                 // Read the first frame
 119                 valid = read_frame( this->fd, dv_data, &this->is_pal );
 120
 121                 // If it looks like a valid frame, the get stats
 122                 if ( valid )
 123                 {
 124                         // Get the properties
 125                         mlt_properties properties = mlt_producer_properties( &this->parent );
 126
 127                         // Determine the file size
 128                         struct stat buf;
 129                         fstat( this->fd, &buf );
 130
 131                         // Store the file size
 132                         this->file_size = buf.st_size;
 133
 134                         // Determine the frame size
 135                         this->frame_size = this->is_pal ? frame_size_625_50 : frame_size_525_60;
 136
 137                         // Determine the number of frames in the file
 138                         this->frames_in_file = this->file_size / this->frame_size;
 139
 140                         // Calculate default in/out points
 141                         double fps = this->is_pal ? 25 : 30000.0 / 1001.0;
 142                         if ( mlt_properties_get_double( properties, "fps" ) == fps )
 143                         {
 144                                 mlt_properties_set_position( properties, "length", this->frames_in_file );
 145                                 mlt_properties_set_position( properties, "in", 0 );
 146                                 mlt_properties_set_position( properties, "out", this->frames_in_file - 1 );
 147                         }
 148                         else
 149                         {
 150                                 valid = 0;
 151                         }
 152
 153                         // Parse the header for meta info
 154                         dv_parse_header( this->dv_decoder, dv_data );
 155                         mlt_properties_set_double( properties, "aspect_ratio", dv_format_wide( this->dv_decoder ) ? 16.0/9.0 : 4.0/3.0 );
 156                 }
 157
 158                 free( dv_data );
 159         }
 160
 161         return valid;
 162 }
 163
 164 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 165 {
 166         int pitches[3] = { 0, 0, 0 };
 167         uint8_t *pixels[3] = { NULL, NULL, NULL };
 168
 169         // Get the frames properties
 170         mlt_properties properties = mlt_frame_properties( this );
 171
 172         // Get the dv decoder
 173         dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
 174
 175         // Get the dv data
 176         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
 177
 178         // Parse the header for meta info
 179         dv_parse_header( decoder, dv_data );
 180
 181         // Assign width and height from properties
 182         *width = mlt_properties_get_int( properties, "width" );
 183         *height = mlt_properties_get_int( properties, "height" );
 184
 185         // Extract an image of the format requested
 186         if ( *format == mlt_image_yuv422 )
 187         {
 188                 // Allocate an image
 189                 uint8_t *image = malloc( *width * *height * 2 );
 190
 191                 // Pass to properties for clean up
 192                 mlt_properties_set_data( properties, "image", image, *width * *height * 2, free, NULL );
 193
 194                 // Decode the image
 195                 pitches[ 0 ] = *width * 2;
 196                 pixels[ 0 ] = image;
 197                 dv_decode_full_frame( decoder, dv_data, e_dv_color_yuv, pixels, pitches );
 198
 199                 // Assign result
 200                 *buffer = image;
 201         }
 202         else if ( *format == mlt_image_rgb24 )
 203         {
 204                 // Allocate an image
 205                 uint8_t *image = malloc( *width * *height * 3 );
 206
 207                 // Pass to properties for clean up
 208                 mlt_properties_set_data( properties, "image", image, *width * *height * 3, free, NULL );
 209
 210                 // Decode the frame
 211                 pitches[ 0 ] = 720 * 3;
 212                 pixels[ 0 ] = image;
 213                 dv_decode_full_frame( decoder, dv_data, e_dv_color_rgb, pixels, pitches );
 214
 215                 // Assign result
 216                 *buffer = image;
 217         }
 218
 219         return 0;
 220 }
 221
 222 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 223 {
 224         int16_t *p;
 225         int i, j;
 226         int16_t *audio_channels[ 4 ];
 227
 228         // Get the frames properties
 229         mlt_properties properties = mlt_frame_properties( this );
 230
 231         // Get the dv decoder
 232         dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
 233
 234         // Get the dv data
 235         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
 236
 237         // Parse the header for meta info
 238         dv_parse_header( decoder, dv_data );
 239
 240         // Obtain required values
 241         //fprintf( stderr, "libdv: frequency %d\n", decoder->audio->frequency );
 242         *frequency = decoder->audio->frequency;
 243         *samples = decoder->audio->samples_this_frame;
 244         *channels = decoder->audio->num_channels;
 245
 246         // Create a temporary workspace
 247         for ( i = 0; i < 4; i++ )
 248                 audio_channels[ i ] = malloc( DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
 249
 250         // Create a workspace for the result
 251         *buffer = malloc( *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
 252
 253         // Pass the allocated audio buffer as a property
 254         mlt_properties_set_data( properties, "audio", *buffer, *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ), free, NULL );
 255
 256         // Decode the audio
 257         dv_decode_full_audio( decoder, dv_data, audio_channels );
 258
 259         // Interleave the audio
 260         p = *buffer;
 261         for ( i = 0; i < *samples; i++ )
 262                 for ( j = 0; j < *channels; j++ )
 263                         *p++ = audio_channels[ j ][ i ];
 264
 265         // Free the temporary work space
 266         for ( i = 0; i < 4; i++ )
 267                 free( audio_channels[ i ] );
 268
 269         return 0;
 270 }
 271
 272 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 273 {
 274         producer_libdv this = producer->child;
 275         uint8_t *data = malloc( frame_size_625_50 );
 276
 277         // Obtain the current frame number
 278         uint64_t position = mlt_producer_frame( producer );
 279
 280         // Convert timecode to a file position (ensuring that we're on a frame boundary)
 281         uint64_t offset = position * this->frame_size;
 282
 283         // Create an empty frame
 284         *frame = mlt_frame_init( );
 285
 286         // Seek and fetch
 287         if ( this->fd != 0 &&
 288                  lseek( this->fd, offset, SEEK_SET ) == offset &&
 289                  read_frame( this->fd, data, &this->is_pal ) )
 290         {
 291                 // Get the frames properties
 292                 mlt_properties properties = mlt_frame_properties( *frame );
 293
 294                 // Pass the dv decoder
 295                 mlt_properties_set_data( properties, "dv_decoder", this->dv_decoder, 0, NULL, NULL );
 296
 297                 // Pass the dv data
 298                 mlt_properties_set_data( properties, "dv_data", data, frame_size_625_50, free, NULL );
 299
 300                 // Update other info on the frame
 301                 mlt_properties_set_int( properties, "width", 720 );
 302                 mlt_properties_set_int( properties, "height", this->is_pal ? 576 : 480 );
 303                 mlt_properties_set_int( properties, "top_field_first", 0 );
 304
 305                 // Parse the header for meta info
 306                 dv_parse_header( this->dv_decoder, data );
 307                 mlt_properties_set_int( properties, "progressive", dv_is_progressive( this->dv_decoder ) );
 308                 mlt_properties_set_double( properties, "aspect_ratio", dv_format_wide( this->dv_decoder ) ? 16.0/9.0 : 4.0/3.0 );
 309
 310                 // Hmm - register audio callback
 311                 ( *frame )->get_audio = producer_get_audio;
 312
 313                 // Push the get_image method on to the stack
 314                 mlt_frame_push_get_image( *frame, producer_get_image );
 315         }
 316         else
 317         {
 318                 free( data );
 319         }
 320
 321         // Update timecode on the frame we're creating
 322         mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 323
 324         // Calculate the next timecode
 325         mlt_producer_prepare_next( producer );
 326
 327         return 0;
 328 }
 329
 330 static void producer_close( mlt_producer parent )
 331 {
 332         // Obtain this
 333         producer_libdv this = parent->child;
 334
 335         // Free the dv deconder
 336         //dv_decoder_free( this->dv_decoder );
 337
 338         // Close the file
 339         if ( this->fd > 0 )
 340                 close( this->fd );
 341
 342         // Close the parent
 343         parent->close = NULL;
 344         mlt_producer_close( parent );
 345
 346         // Free the memory
 347         free( this );
 348 }
 349