research.m1stereo.tv/gitweb/ - melted/blob - src/modules/vmfx/producer_pgm.c

   1 /*
   2  * producer_pgm.c -- PGM producer
   3  * Copyright (C) 2005 Visual Media Fx Inc.
   4  * Author: Charles Yates <charles.yates@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser 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 <framework/mlt_producer.h>
  22 #include <framework/mlt_frame.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 static int read_pgm( char *name, uint8_t **image, int *width, int *height, int *maxval );
  27 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index );
  28 static void producer_close( mlt_producer parent );
  29
  30 mlt_producer producer_pgm_init( mlt_profile profile, mlt_service_type type, const char *id, char *resource )
  31 {
  32         mlt_producer this = NULL;
  33         uint8_t *image = NULL;
  34         int width = 0;
  35         int height = 0;
  36         int maxval = 0;
  37
  38         if ( read_pgm( resource, &image, &width, &height, &maxval ) == 0 )
  39         {
  40                 this = calloc( 1, sizeof( struct mlt_producer_s ) );
  41                 if ( this != NULL && mlt_producer_init( this, NULL ) == 0 )
  42                 {
  43                         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
  44                         this->get_frame = producer_get_frame;
  45                         this->close = ( mlt_destructor )producer_close;
  46                         mlt_properties_set( properties, "resource", resource );
  47                         mlt_properties_set_data( properties, "image", image, 0, mlt_pool_release, NULL );
  48                         mlt_properties_set_int( properties, "real_width", width );
  49                         mlt_properties_set_int( properties, "real_height", height );
  50                 }
  51                 else
  52                 {
  53                         mlt_pool_release( image );
  54                         free( this );
  55                         this = NULL;
  56                 }
  57         }
  58
  59         return this;
  60 }
  61
  62 /** Load the PGM file.
  63 */
  64
  65 static int read_pgm( char *name, uint8_t **image, int *width, int *height, int *maxval )
  66 {
  67         uint8_t *input = NULL;
  68         int error = 0;
  69         FILE *f = fopen( name, "r" );
  70         char data[ 512 ];
  71
  72         // Initialise
  73         *image = NULL;
  74         *width = 0;
  75         *height = 0;
  76         *maxval = 0;
  77
  78         // Get the magic code
  79         if ( f != NULL && fgets( data, 511, f ) != NULL && data[ 0 ] == 'P' && data[ 1 ] == '5' )
  80         {
  81                 char *p = data + 2;
  82                 int i = 0;
  83                 int val = 0;
  84
  85                 // PGM Header parser (probably needs to be strengthened)
  86                 for ( i = 0; !error && i < 3; i ++ )
  87                 {
  88                         if ( *p != '\0' && *p != '\n' )
  89                                 val = strtol( p, &p, 10 );
  90                         else
  91                                 p = NULL;
  92
  93                         while ( error == 0 && p == NULL )
  94                         {
  95                                 if ( fgets( data, 511, f ) == NULL )
  96                                         error = 1;
  97                                 else if ( data[ 0 ] != '#' )
  98                                         val = strtol( data, &p, 10 );
  99                         }
 100
 101                         switch( i )
 102                         {
 103                                 case 0: *width = val; break;
 104                                 case 1: *height = val; break;
 105                                 case 2: *maxval = val; break;
 106                         }
 107                 }
 108
 109                 if ( !error )
 110                 {
 111                         // Determine if this is one or two bytes per pixel
 112                         int bpp = *maxval > 255 ? 2 : 1;
 113                         int size = *width * *height * bpp;
 114                         uint8_t *p;
 115
 116                         // Allocate temporary storage for the data and the image
 117                         input = mlt_pool_alloc( *width * *height * bpp );
 118                         *image = mlt_pool_alloc( *width * *height * sizeof( uint8_t ) * 2 );
 119                         p = *image;
 120
 121                         error = *image == NULL || input == NULL;
 122
 123                         if ( !error )
 124                         {
 125                                 // Read the raw data
 126                                 error = fread( input, *width * *height * bpp, 1, f ) != 1;
 127
 128                                 if ( !error )
 129                                 {
 130                                         // Convert to yuv422 (very lossy - need to extend this to allow 16 bit alpha out)
 131                                         for ( i = 0; i < size; i += bpp )
 132                                         {
 133                                                 *p ++ = 16 + ( input[ i ] * 219 ) / 255;
 134                                                 *p ++ = 128;
 135                                         }
 136                                 }
 137                         }
 138                 }
 139
 140                 if ( error )
 141                         mlt_pool_release( *image );
 142                 mlt_pool_release( input );
 143         }
 144         else
 145         {
 146                 error = 1;
 147         }
 148
 149         if ( f != NULL )
 150                 fclose( f );
 151
 152         return error;
 153 }
 154
 155 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
 156 {
 157         mlt_producer producer = mlt_frame_pop_service( this );
 158         int real_width = mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "real_width" );
 159         int real_height = mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "real_height" );
 160         int size = real_width * real_height;
 161         uint8_t *image = mlt_pool_alloc( size * 2 );
 162         uint8_t *source = mlt_properties_get_data( MLT_PRODUCER_PROPERTIES( producer ), "image", NULL );
 163
 164         mlt_properties_set_data( MLT_FRAME_PROPERTIES( this ), "image", image, size * 2, mlt_pool_release, NULL );
 165
 166         *width = real_width;
 167         *height = real_height;
 168         *format = mlt_image_yuv422;
 169         *buffer = image;
 170
 171         if ( image != NULL && source != NULL )
 172                 memcpy( image, source, size * 2 );
 173
 174         return 0;
 175 }
 176
 177 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 178 {
 179         // Construct a test frame
 180         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
 181
 182         // Get the frames properties
 183         mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
 184
 185         // Pass the data on the frame properties
 186         mlt_properties_pass_list( properties, MLT_PRODUCER_PROPERTIES( producer ), "real_width,real_height" );
 187         mlt_properties_set_int( properties, "has_image", 1 );
 188         mlt_properties_set_int( properties, "progressive", 1 );
 189         mlt_properties_set_double( properties, "aspect_ratio", 1 );
 190
 191         // Push the image callback
 192         mlt_frame_push_service( *frame, producer );
 193         mlt_frame_push_get_image( *frame, producer_get_image );
 194
 195         // Update timecode on the frame we're creating
 196         mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 197
 198         // Calculate the next timecode
 199         mlt_producer_prepare_next( producer );
 200
 201         return 0;
 202 }
 203
 204 static void producer_close( mlt_producer parent )
 205 {
 206         parent->close = NULL;
 207         mlt_producer_close( parent );
 208         free( parent );
 209 }