2 * producer_pgm.c -- PGM producer
3 * Copyright (C) 2005 Visual Media Fx Inc.
4 * Author: Charles Yates <charles.yates@gmail.com>
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.
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.
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.
21 #include "producer_pgm.h"
22 #include <framework/mlt_frame.h>
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 );
30 mlt_producer producer_pgm_init( void *resource )
32 mlt_producer this = NULL;
33 uint8_t *image = NULL;
38 if ( read_pgm( resource, &image, &width, &height, &maxval ) == 0 )
40 this = calloc( 1, sizeof( struct mlt_producer_s ) );
41 if ( this != NULL && mlt_producer_init( this, NULL ) == 0 )
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 );
53 mlt_pool_release( image );
62 /** Load the PGM file.
65 static int read_pgm( char *name, uint8_t **image, int *width, int *height, int *maxval )
67 uint8_t *input = NULL;
69 FILE *f = fopen( name, "r" );
79 if ( f != NULL && fgets( data, 511, f ) != NULL && data[ 0 ] == 'P' && data[ 1 ] == '5' )
85 // PGM Header parser (probably needs to be strengthened)
86 for ( i = 0; !error && i < 3; i ++ )
88 if ( *p != '\0' && *p != '\n' )
89 val = strtol( p, &p, 10 );
93 while ( error == 0 && p == NULL )
95 if ( fgets( data, 511, f ) == NULL )
97 else if ( data[ 0 ] != '#' )
98 val = strtol( data, &p, 10 );
103 case 0: *width = val; break;
104 case 1: *height = val; break;
105 case 2: *maxval = val; break;
111 // Determine if this is one or two bytes per pixel
112 int bpp = *maxval > 255 ? 2 : 1;
113 int size = *width * *height * bpp;
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 );
121 error = *image == NULL || input == NULL;
126 error = fread( input, *width * *height * bpp, 1, f ) != 1;
130 // Convert to yuv422 (very lossy - need to extend this to allow 16 bit alpha out)
131 for ( i = 0; i < size; i += bpp )
133 *p ++ = 16 + ( input[ i ] * 219 ) / 255;
141 mlt_pool_release( *image );
142 mlt_pool_release( input );
155 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
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 );
164 mlt_properties_set_data( MLT_FRAME_PROPERTIES( this ), "image", image, size * 2, mlt_pool_release, NULL );
167 *height = real_height;
168 *format = mlt_image_yuv422;
171 if ( image != NULL && source != NULL )
172 memcpy( image, source, size * 2 );
177 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
179 // Construct a test frame
180 *frame = mlt_frame_init( );
182 // Get the frames properties
183 mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
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 );
191 // Push the image callback
192 mlt_frame_push_service( *frame, producer );
193 mlt_frame_push_get_image( *frame, producer_get_image );
195 // Update timecode on the frame we're creating
196 mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
198 // Calculate the next timecode
199 mlt_producer_prepare_next( producer );
204 static void producer_close( mlt_producer parent )
206 parent->close = NULL;
207 mlt_producer_close( parent );