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