research.m1stereo.tv/gitweb/ - melted/blob - mlt/src/modules/core/producer_ppm.c

   1 /*
   2  * producer_ppm.c -- simple ppm 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_ppm.h"
  22 #include <framework/mlt_frame.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index );
  27 static void producer_close( mlt_producer parent );
  28
  29 mlt_producer producer_ppm_init( void *command )
  30 {
  31         producer_ppm this = calloc( sizeof( struct producer_ppm_s ), 1 );
  32         if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
  33         {
  34                 mlt_producer producer = &this->parent;
  35
  36                 producer->get_frame = producer_get_frame;
  37                 producer->close = producer_close;
  38
  39                 if ( command != NULL )
  40                         this->command = strdup( command );
  41
  42                 return producer;
  43         }
  44         free( this );
  45         return NULL;
  46 }
  47
  48 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
  49 {
  50         // Get the frames properties
  51         mlt_properties properties = mlt_frame_properties( this );
  52
  53         // Get the RGB image
  54         uint8_t *rgb = mlt_properties_get_data( properties, "image", NULL );
  55
  56         // Get width and height
  57         *width = mlt_properties_get_int( properties, "width" );
  58         *height = mlt_properties_get_int( properties, "height" );
  59
  60         // Convert to requested format
  61         if ( *format == mlt_image_yuv422 )
  62         {
  63                 uint8_t *image = malloc( *width * *height * 2 );
  64                 mlt_convert_rgb24_to_yuv422( rgb, *width, *height, *width * 3, image );
  65                 mlt_properties_set_data( properties, "image", image, *width * *height * 2, free, NULL );
  66                 *buffer = image;
  67         }
  68         else if ( *format == mlt_image_rgb24 )
  69         {
  70                 *buffer = rgb;
  71         }
  72
  73         return 0;
  74 }
  75
  76 static void producer_ppm_position( producer_ppm this, uint64_t requested )
  77 {
  78         if ( requested != this->expected )
  79         {
  80                 if ( this->video != NULL )
  81                         pclose( this->video );
  82                 this->video = NULL;
  83                 if ( this->audio != NULL )
  84                         pclose( this->audio );
  85                 this->audio = NULL;
  86         }
  87
  88         // This is the next frame we expect
  89         this->expected = mlt_producer_frame( &this->parent ) + 1;
  90 }
  91
  92 FILE *producer_ppm_run_video( producer_ppm this )
  93 {
  94         if ( this->video == NULL )
  95         {
  96                 if ( this->command == NULL )
  97                 {
  98                         this->video = popen( "image2raw -n -a -r 3 -ppm /usr/share/pixmaps/*.png", "r" );
  99                 }
 100                 else
 101                 {
 102                         char command[ 1024 ];
 103                         float fps = mlt_producer_get_fps( &this->parent );
 104                         float position = mlt_producer_position( &this->parent );
 105                         sprintf( command, "ffmpeg -i \"%s\" -ss %f -f imagepipe -r %f -img ppm -", this->command, position, fps );
 106                         this->video = popen( command, "r" );
 107                 }
 108         }
 109         return this->video;
 110 }
 111
 112 FILE *producer_ppm_run_audio( producer_ppm this )
 113 {
 114         if ( this->audio == NULL )
 115         {
 116                 if ( this->command != NULL )
 117                 {
 118                         char command[ 1024 ];
 119                         float position = mlt_producer_position( &this->parent );
 120                         sprintf( command, "ffmpeg -i \"%s\" -ss %f -f s16le -ar 48000 -ac 2 -", this->command, position );
 121                         this->audio = popen( command, "r" );
 122                 }
 123         }
 124         return this->audio;
 125 }
 126
 127
 128 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 129 {
 130         // Get the frames properties
 131         mlt_properties properties = mlt_frame_properties( this );
 132
 133         FILE *pipe = mlt_properties_get_data( properties, "audio.pipe", NULL );
 134
 135         *frequency = 48000;
 136         *channels = 2;
 137         *samples = 1920;
 138
 139         // Size
 140         int size = *samples * *channels * 2;
 141
 142         // Allocate an image
 143         *buffer = malloc( size );
 144
 145         // Read it
 146         fread( *buffer, size, 1, pipe );
 147
 148         // Pass the data on the frame properties
 149         mlt_properties_set_data( properties, "audio", *buffer, size, free, NULL );
 150
 151         return 0;
 152 }
 153
 154 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 155 {
 156         producer_ppm this = producer->child;
 157         int width;
 158         int height;
 159
 160         // Construct a test frame
 161         *frame = mlt_frame_init( );
 162
 163         // Are we at the position expected?
 164         producer_ppm_position( this, mlt_producer_frame( producer ) );
 165
 166         // Open the pipe
 167         FILE *video = producer_ppm_run_video( this );
 168
 169         // Open the audio pipe
 170         FILE *audio = producer_ppm_run_audio( this );
 171
 172         // Get the frames properties
 173         mlt_properties properties = mlt_frame_properties( *frame );
 174
 175         // Read the video
 176         if ( video != NULL && fscanf( video, "P6\n%d %d\n255\n", &width, &height ) == 2 )
 177         {
 178                 // Allocate an image
 179                 uint8_t *image = malloc( width * height * 3 );
 180
 181                 // Read it
 182                 fread( image, width * height * 3, 1, video );
 183
 184                 // Pass the data on the frame properties
 185                 mlt_properties_set_data( properties, "image", image, width * height * 3, free, NULL );
 186                 mlt_properties_set_int( properties, "width", width );
 187                 mlt_properties_set_int( properties, "height", height );
 188
 189                 // Push the image callback
 190                 mlt_frame_push_get_image( *frame, producer_get_image );
 191         }
 192
 193         // Read the audio
 194         if ( audio != NULL )
 195         {
 196                 // Set the audio pipe
 197                 mlt_properties_set_data( properties, "audio.pipe", audio, 0, NULL, NULL );
 198
 199                 // Hmm - register audio callback
 200                 ( *frame )->get_audio = producer_get_audio;
 201         }
 202
 203         // Update timecode on the frame we're creating
 204         mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );
 205
 206         // Calculate the next timecode
 207         mlt_producer_prepare_next( producer );
 208
 209         return 0;
 210 }
 211
 212 static void producer_close( mlt_producer parent )
 213 {
 214         producer_ppm this = parent->child;
 215         if ( this->video )
 216                 pclose( this->video );
 217         if ( this->audio )
 218                 pclose( this->audio );
 219         free( this->command );
 220         parent->close = NULL;
 221         mlt_producer_close( parent );
 222         free( this );
 223 }
 224