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, "length", length );
 135                         mlt_properties_set_timecode( properties, "in", 0.0 );
 136                         mlt_properties_set_timecode( properties, "out", length );
 137
 138                         // Set the speed to normal
 139                         mlt_properties_set_double( properties, "speed", 1 );
 140                 }
 141
 142                 free( dv_data );
 143         }
 144
 145         return valid;
 146 }
 147
 148 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 149 {
 150         int pitches[3] = { 0, 0, 0 };
 151         uint8_t *pixels[3] = { NULL, NULL, NULL };
 152
 153         // Get the frames properties
 154         mlt_properties properties = mlt_frame_properties( this );
 155
 156         // Get the dv decoder
 157         dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
 158
 159         // Get the dv data
 160         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
 161
 162         // Assign width and height from properties
 163         *width = mlt_properties_get_int( properties, "width" );
 164         *height = mlt_properties_get_int( properties, "height" );
 165
 166         // Parse the header
 167         dv_parse_header( decoder, dv_data );
 168
 169         // Extract an image of the format requested
 170         if ( *format == mlt_image_yuv422 )
 171         {
 172                 // Allocate an image
 173                 uint8_t *image = malloc( *width * *height * 2 );
 174
 175                 // Pass to properties for clean up
 176                 mlt_properties_set_data( properties, "image", image, *width * *height * 2, free, NULL );
 177
 178                 // Decode the image
 179                 pitches[ 0 ] = *width * 2;
 180                 pixels[ 0 ] = image;
 181                 dv_decode_full_frame( decoder, dv_data, e_dv_color_yuv, pixels, pitches );
 182
 183                 // Assign result
 184                 *buffer = image;
 185         }
 186         else if ( *format == mlt_image_rgb24 )
 187         {
 188                 // Allocate an image
 189                 uint8_t *image = malloc( *width * *height * 3 );
 190
 191                 // Pass to properties for clean up
 192                 mlt_properties_set_data( properties, "image", image, *width * *height * 3, free, NULL );
 193
 194                 // Decode the frame
 195                 pitches[ 0 ] = 720 * 3;
 196                 pixels[ 0 ] = image;
 197                 dv_decode_full_frame( decoder, dv_data, e_dv_color_rgb, pixels, pitches );
 198
 199                 // Assign result
 200                 *buffer = image;
 201         }
 202
 203         return 0;
 204 }
 205
 206 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 207 {
 208         int16_t *p;
 209         int i, j;
 210         int16_t *audio_channels[ 4 ];
 211
 212         // Get the frames properties
 213         mlt_properties properties = mlt_frame_properties( this );
 214
 215         // Get the dv decoder
 216         dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );
 217
 218         // Get the dv data
 219         uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );
 220
 221         // Parse the header for meta info
 222         dv_parse_header( decoder, dv_data );
 223
 224         // Obtain required values
 225         *frequency = decoder->audio->frequency;
 226         *samples = decoder->audio->samples_this_frame;
 227         *channels = decoder->audio->num_channels;
 228
 229         // Create a temporary workspace
 230         for ( i = 0; i < 4; i++ )
 231                 audio_channels[ i ] = malloc( DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
 232
 233         // Create a workspace for the result
 234         *buffer = malloc( *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );
 235
 236         // Pass the allocated audio buffer as a property
 237         mlt_properties_set_data( properties, "audio", *buffer, *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ), free, NULL );
 238
 239         // Decode the audio
 240         dv_decode_full_audio( decoder, dv_data, audio_channels );
 241
 242         // Interleave the audio
 243         p = *buffer;
 244         for ( i = 0; i < *samples; i++ )
 245                 for ( j = 0; j < *channels; j++ )
 246                         *p++ = audio_channels[ j ][ i ];
 247
 248         // Free the temporary work space
 249         for ( i = 0; i < 4; i++ )
 250                 free( audio_channels[ i ] );
 251
 252         return 0;
 253 }
 254
 255 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 256 {
 257         producer_libdv this = producer->child;
 258         uint8_t *data = malloc( frame_size_625_50 );
 259
 260         // Obtain the current frame number
 261         uint64_t position = mlt_producer_frame( producer );
 262
 263         // Convert timecode to a file position (ensuring that we're on a frame boundary)
 264         uint64_t offset = position * this->frame_size;
 265
 266         // Create an empty frame
 267         *frame = mlt_frame_init( );
 268
 269         // Seek and fetch
 270         if ( this->fd != 0 &&
 271                  lseek( this->fd, offset, SEEK_SET ) == offset &&
 272                  read_frame( this->fd, data, &this->is_pal ) )
 273         {
 274                 // Get the frames properties
 275                 mlt_properties properties = mlt_frame_properties( *frame );
 276
 277                 // Pass the dv decoder
 278                 mlt_properties_set_data( properties, "dv_decoder", this->dv_decoder, 0, NULL, NULL );
 279
 280                 // Pass the dv data
 281                 mlt_properties_set_data( properties, "dv_data", data, frame_size_625_50, free, NULL );
 282
 283                 // Update other info on the frame
 284                 mlt_properties_set_int( properties, "width", 720 );
 285                 mlt_properties_set_int( properties, "height", this->is_pal ? 576 : 480 );
 286
 287                 // Hmm - register audio callback
 288                 ( *frame )->get_audio = producer_get_audio;
 289
 290                 // Push the get_image method on to the stack
 291                 mlt_frame_push_get_image( *frame, producer_get_image );
 292         }
 293         else
 294         {
 295                 free( data );
 296         }
 297
 298         // Update timecode on the frame we're creating
 299         mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );
 300
 301         // Calculate the next timecode
 302         mlt_producer_prepare_next( producer );
 303
 304         return 0;
 305 }
 306
 307 static void producer_close( mlt_producer parent )
 308 {
 309         // Obtain this
 310         producer_libdv this = parent->child;
 311
 312         // Free the dv deconder
 313         dv_decoder_free( this->dv_decoder );
 314
 315         // Close the file
 316         if ( this->fd != 0 )
 317                 close( this->fd );
 318
 319         // Close the parent
 320         parent->close = NULL;
 321         mlt_producer_close( parent );
 322
 323         // Free the memory
 324         free( this );
 325 }
 326