research.m1stereo.tv/gitweb/ - melted/blob - 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 typedef struct producer_ppm_s *producer_ppm;
  27
  28 struct producer_ppm_s
  29 {
  30         struct mlt_producer_s parent;
  31         char *command;
  32         FILE *video;
  33         FILE *audio;
  34         uint64_t expected;
  35 };
  36
  37 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index );
  38 static void producer_close( mlt_producer parent );
  39
  40 mlt_producer producer_ppm_init( void *command )
  41 {
  42         producer_ppm this = calloc( sizeof( struct producer_ppm_s ), 1 );
  43         if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
  44         {
  45                 mlt_producer producer = &this->parent;
  46                 mlt_properties properties = mlt_producer_properties( producer );
  47
  48                 producer->get_frame = producer_get_frame;
  49                 producer->close = producer_close;
  50
  51                 if ( command != NULL )
  52                 {
  53                         mlt_properties_set( properties, "resource", command );
  54                         this->command = strdup( command );
  55                 }
  56                 else
  57                 {
  58                         mlt_properties_set( properties, "resource", "ppm test" );
  59                 }
  60
  61                 return producer;
  62         }
  63         free( this );
  64         return NULL;
  65 }
  66
  67 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
  68 {
  69         // Get the frames properties
  70         mlt_properties properties = mlt_frame_properties( this );
  71
  72         if ( mlt_properties_get_int( properties, "has_image" ) )
  73         {
  74                 // Get the RGB image
  75                 uint8_t *rgb = mlt_properties_get_data( properties, "image", NULL );
  76
  77                 // Get width and height
  78                 *width = mlt_properties_get_int( properties, "width" );
  79                 *height = mlt_properties_get_int( properties, "height" );
  80
  81                 // Convert to requested format
  82                 if ( *format == mlt_image_yuv422 )
  83                 {
  84                         uint8_t *image = malloc( *width * *height * 2 );
  85                         mlt_convert_rgb24_to_yuv422( rgb, *width, *height, *width * 3, image );
  86                         mlt_properties_set_data( properties, "image", image, *width * *height * 2, free, NULL );
  87                         *buffer = image;
  88                 }
  89                 else if ( *format == mlt_image_rgb24 )
  90                 {
  91                         *buffer = rgb;
  92                 }
  93         }
  94         else
  95         {
  96                 mlt_frame_get_image( this, buffer, format, width, height, writable );
  97         }
  98
  99         return 0;
 100 }
 101
 102 FILE *producer_ppm_run_video( producer_ppm this )
 103 {
 104         if ( this->video == NULL )
 105         {
 106                 if ( this->command == NULL )
 107                 {
 108                         this->video = popen( "image2raw -k -r 25 -ppm /usr/share/pixmaps/*.png", "r" );
 109                 }
 110                 else
 111                 {
 112                         char command[ 1024 ];
 113                         float fps = mlt_producer_get_fps( &this->parent );
 114                         float position = mlt_producer_position( &this->parent );
 115                         sprintf( command, "ffmpeg -i \"%s\" -ss %f -f imagepipe -r %f -img ppm - 2>/dev/null", this->command, position, fps );
 116                         this->video = popen( command, "r" );
 117                 }
 118         }
 119         return this->video;
 120 }
 121
 122 FILE *producer_ppm_run_audio( producer_ppm this )
 123 {
 124         if ( this->audio == NULL )
 125         {
 126                 if ( this->command != NULL )
 127                 {
 128                         char command[ 1024 ];
 129                         float position = mlt_producer_position( &this->parent );
 130                         sprintf( command, "ffmpeg -i \"%s\" -ss %f -f s16le -ar 48000 -ac 2 - 2>/dev/null", this->command, position );
 131                         this->audio = popen( command, "r" );
 132                 }
 133         }
 134         return this->audio;
 135 }
 136
 137 static void producer_ppm_position( producer_ppm this, uint64_t requested )
 138 {
 139         if ( requested != this->expected )
 140         {
 141                 if ( this->video != NULL )
 142                         pclose( this->video );
 143                 this->video = NULL;
 144                 if ( this->audio != NULL )
 145                         pclose( this->audio );
 146                 this->audio = NULL;
 147         }
 148
 149         // This is the next frame we expect
 150         this->expected = mlt_producer_frame( &this->parent ) + 1;
 151
 152         // Open the pipe
 153         this->video = producer_ppm_run_video( this );
 154
 155         // Open the audio pipe
 156         this->audio = producer_ppm_run_audio( this );
 157
 158 }
 159
 160 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 161 {
 162         // Get the frames properties
 163         mlt_properties properties = mlt_frame_properties( this );
 164
 165         FILE *pipe = mlt_properties_get_data( properties, "audio.pipe", NULL );
 166
 167         *frequency = 48000;
 168         *channels = 2;
 169         *samples = 1920;
 170
 171         // Size
 172         int size = *samples * *channels * 2;
 173
 174         // Allocate an image
 175         *buffer = malloc( size );
 176
 177         // Read it
 178         if ( pipe != NULL )
 179                 fread( *buffer, size, 1, pipe );
 180         else
 181                 memset( *buffer, 0, size );
 182
 183         // Pass the data on the frame properties
 184         mlt_properties_set_data( properties, "audio", *buffer, size, free, NULL );
 185
 186         return 0;
 187 }
 188
 189 static int read_ppm_header( FILE *video, int *width, int *height )
 190 {
 191         int count = 0;
 192         {
 193                 char temp[ 132 ];
 194                 fgets( temp, 132, video );
 195                 fgets( temp, 132, video );
 196                 count += sscanf( temp, "%d %d", width, height );
 197                 fgets( temp, 132, video );
 198         }
 199         return count;
 200 }
 201
 202 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 203 {
 204         producer_ppm this = producer->child;
 205         int width;
 206         int height;
 207
 208         // Construct a test frame
 209         *frame = mlt_frame_init( );
 210
 211         // Are we at the position expected?
 212         producer_ppm_position( this, mlt_producer_frame( producer ) );
 213
 214         // Get the frames properties
 215         mlt_properties properties = mlt_frame_properties( *frame );
 216
 217         FILE *video = this->video;
 218         FILE *audio = this->audio;
 219
 220         // Read the video
 221         if ( video != NULL && read_ppm_header( video, &width, &height ) == 2 )
 222         {
 223
 224                 // Allocate an image
 225                 uint8_t *image = malloc( width * height * 3 );
 226
 227                 // Read it
 228                 fread( image, width * height * 3, 1, video );
 229
 230                 // Pass the data on the frame properties
 231                 mlt_properties_set_data( properties, "image", image, width * height * 3, free, NULL );
 232                 mlt_properties_set_int( properties, "width", width );
 233                 mlt_properties_set_int( properties, "height", height );
 234                 mlt_properties_set_int( properties, "has_image", 1 );
 235
 236                 // Push the image callback
 237                 mlt_frame_push_get_image( *frame, producer_get_image );
 238         }
 239         else
 240         {
 241                 // Push the image callback
 242                 mlt_frame_push_get_image( *frame, producer_get_image );
 243         }
 244
 245         // Set the audio pipe
 246         mlt_properties_set_data( properties, "audio.pipe", audio, 0, NULL, NULL );
 247
 248         // Hmm - register audio callback
 249         ( *frame )->get_audio = producer_get_audio;
 250
 251         // Update timecode on the frame we're creating
 252         mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );
 253
 254         // Calculate the next timecode
 255         mlt_producer_prepare_next( producer );
 256
 257         return 0;
 258 }
 259
 260 static void producer_close( mlt_producer parent )
 261 {
 262         producer_ppm this = parent->child;
 263         if ( this->video )
 264                 pclose( this->video );
 265         if ( this->audio )
 266                 pclose( this->audio );
 267         free( this->command );
 268         parent->close = NULL;
 269         mlt_producer_close( parent );
 270         free( this );
 271 }
 272