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_timecode length = ( mlt_timecode )( this->frames_in_file ) / fps;
 134                         mlt_properties_set_double( properties, "fps", fps );
 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                         // Parse the header for meta info
 140                         dv_parse_header( this->dv_decoder, data );
 141                         mlt_properties_set_double( properties, "aspect_ratio", dv_format_wide( this->dv_decoder ) ? 16.0/9.0 : 4.0/3.0 );
 142
 143                         // Set the speed to normal
 144                         mlt_properties_set_double( properties, "speed", 1 );
 145                 }
 146
 147                 free( dv_data );
 148         }
 149
 150         return valid;
 151 }
 152
 153 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 154 {
 155         int pitches[3] = { 0, 0, 0 };
 156         uint8_t *pixels[3] = { NULL, NULL, NULL };
 157
 158         // Get the frames properties
 159         mlt_properties properties = mlt_frame_properties( this );
 160
 161         // Get the dv decoder
 162         dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
 163
 164         // Get the dv data
 165         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
 166
 167         // Parse the header for meta info
 168         dv_parse_header( this->dv_decoder, data );
 169
 170         // Assign width and height from properties
 171         *width = mlt_properties_get_int( properties, "width" );
 172         *height = mlt_properties_get_int( properties, "height" );
 173
 174         // Extract an image of the format requested
 175         if ( *format == mlt_image_yuv422 )
 176         {
 177                 // Allocate an image
 178                 uint8_t *image = malloc( *width * *height * 2 );
 179
 180                 // Pass to properties for clean up
 181                 mlt_properties_set_data( properties, "image", image, *width * *height * 2, free, NULL );
 182
 183                 // Decode the image
 184                 pitches[ 0 ] = *width * 2;
 185                 pixels[ 0 ] = image;
 186                 dv_decode_full_frame( decoder, dv_data, e_dv_color_yuv, pixels, pitches );
 187
 188                 // Assign result
 189                 *buffer = image;
 190         }
 191         else if ( *format == mlt_image_rgb24 )
 192         {
 193                 // Allocate an image
 194                 uint8_t *image = malloc( *width * *height * 3 );
 195
 196                 // Pass to properties for clean up
 197                 mlt_properties_set_data( properties, "image", image, *width * *height * 3, free, NULL );
 198
 199                 // Decode the frame
 200                 pitches[ 0 ] = 720 * 3;
 201                 pixels[ 0 ] = image;
 202                 dv_decode_full_frame( decoder, dv_data, e_dv_color_rgb, pixels, pitches );
 203
 204                 // Assign result
 205                 *buffer = image;
 206         }
 207
 208         return 0;
 209 }
 210
 211 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 212 {
 213         int16_t *p;
 214         int i, j;
 215         int16_t *audio_channels[ 4 ];
 216
 217         // Get the frames properties
 218         mlt_properties properties = mlt_frame_properties( this );
 219
 220         // Get the dv decoder
 221         dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
 222
 223         // Get the dv data
 224         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
 225
 226         // Parse the header for meta info
 227         dv_parse_header( this->dv_decoder, data );
 228
 229         // Obtain required values
 230         *frequency = decoder->audio->frequency;
 231         *samples = decoder->audio->samples_this_frame;
 232         *channels = decoder->audio->num_channels;
 233
 234         // Create a temporary workspace
 235         for ( i = 0; i < 4; i++ )
 236                 audio_channels[ i ] = malloc( DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
 237
 238         // Create a workspace for the result
 239         *buffer = malloc( *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
 240
 241         // Pass the allocated audio buffer as a property
 242         mlt_properties_set_data( properties, "audio", *buffer, *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ), free, NULL );
 243
 244         // Decode the audio
 245         dv_decode_full_audio( decoder, dv_data, audio_channels );
 246
 247         // Interleave the audio
 248         p = *buffer;
 249         for ( i = 0; i < *samples; i++ )
 250                 for ( j = 0; j < *channels; j++ )
 251                         *p++ = audio_channels[ j ][ i ];
 252
 253         // Free the temporary work space
 254         for ( i = 0; i < 4; i++ )
 255                 free( audio_channels[ i ] );
 256
 257         return 0;
 258 }
 259
 260 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 261 {
 262         producer_libdv this = producer->child;
 263         uint8_t *data = malloc( frame_size_625_50 );
 264
 265         // Obtain the current frame number
 266         uint64_t position = mlt_producer_frame( producer );
 267
 268         // Convert timecode to a file position (ensuring that we're on a frame boundary)
 269         uint64_t offset = position * this->frame_size;
 270
 271         // Create an empty frame
 272         *frame = mlt_frame_init( );
 273
 274         // Seek and fetch
 275         if ( this->fd != 0 &&
 276                  lseek( this->fd, offset, SEEK_SET ) == offset &&
 277                  read_frame( this->fd, data, &this->is_pal ) )
 278         {
 279                 // Get the frames properties
 280                 mlt_properties properties = mlt_frame_properties( *frame );
 281
 282                 // Pass the dv decoder
 283                 mlt_properties_set_data( properties, "dv_decoder", this->dv_decoder, 0, NULL, NULL );
 284
 285                 // Pass the dv data
 286                 mlt_properties_set_data( properties, "dv_data", data, frame_size_625_50, free, NULL );
 287
 288                 // Update other info on the frame
 289                 mlt_properties_set_int( properties, "width", 720 );
 290                 mlt_properties_set_int( properties, "height", this->is_pal ? 576 : 480 );
 291                 mlt_properties_set_int( properties, "top_field_first", 0 );
 292
 293                 // Parse the header for meta info
 294                 dv_parse_header( this->dv_decoder, data );
 295                 mlt_properties_set_int( properties, "progressive", dv_is_progressive( this->dv_decoder ) );
 296                 mlt_properties_set_double( properties, "aspect_ratio", dv_format_wide( this->dv_decoder ) ? 16.0/9.0 : 4.0/3.0 );
 297
 298                 // Hmm - register audio callback
 299                 ( *frame )->get_audio = producer_get_audio;
 300
 301                 // Push the get_image method on to the stack
 302                 mlt_frame_push_get_image( *frame, producer_get_image );
 303         }
 304         else
 305         {
 306                 free( data );
 307         }
 308
 309         // Update timecode on the frame we're creating
 310         mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );
 311
 312         // Calculate the next timecode
 313         mlt_producer_prepare_next( producer );
 314
 315         return 0;
 316 }
 317
 318 static void producer_close( mlt_producer parent )
 319 {
 320         // Obtain this
 321         producer_libdv this = parent->child;
 322
 323         // Free the dv deconder
 324         dv_decoder_free( this->dv_decoder );
 325
 326         // Close the file
 327         if ( this->fd != 0 )
 328                 close( this->fd );
 329
 330         // Close the parent
 331         parent->close = NULL;
 332         mlt_producer_close( parent );
 333
 334         // Free the memory
 335         free( this );
 336 }
 337