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 library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library 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 GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, 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
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 typedef struct producer_ppm_s *producer_ppm;
  28
  29 struct producer_ppm_s
  30 {
  31         struct mlt_producer_s parent;
  32         char *command;
  33         FILE *video;
  34         FILE *audio;
  35         uint64_t expected;
  36 };
  37
  38 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index );
  39 static void producer_close( mlt_producer parent );
  40
  41 mlt_producer producer_ppm_init( mlt_profile profile, mlt_service_type type, const char *id, char *command )
  42 {
  43         producer_ppm this = calloc( sizeof( struct producer_ppm_s ), 1 );
  44         if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
  45         {
  46                 mlt_producer producer = &this->parent;
  47                 mlt_properties properties = MLT_PRODUCER_PROPERTIES( producer );
  48
  49                 producer->get_frame = producer_get_frame;
  50                 producer->close = ( mlt_destructor )producer_close;
  51
  52                 if ( command != NULL )
  53                 {
  54                         mlt_properties_set( properties, "resource", command );
  55                         this->command = strdup( command );
  56                 }
  57                 else
  58                 {
  59                         mlt_properties_set( properties, "resource", "ppm test" );
  60                 }
  61
  62                 return producer;
  63         }
  64         free( this );
  65         return NULL;
  66 }
  67
  68 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
  69 {
  70         // Get the frames properties
  71         mlt_properties properties = MLT_FRAME_PROPERTIES( this );
  72
  73         if ( mlt_properties_get_int( properties, "has_image" ) )
  74         {
  75                 // Get the RGB image
  76                 uint8_t *rgb = mlt_properties_get_data( properties, "image", NULL );
  77
  78                 // Get width and height
  79                 *width = mlt_properties_get_int( properties, "width" );
  80                 *height = mlt_properties_get_int( properties, "height" );
  81
  82                 // Convert to requested format
  83                 if ( *format == mlt_image_yuv422 )
  84                 {
  85                         uint8_t *image = mlt_pool_alloc( *width * ( *height + 1 ) * 2 );
  86                         mlt_convert_rgb24_to_yuv422( rgb, *width, *height, *width * 3, image );
  87                         mlt_properties_set_data( properties, "image", image, *width * ( *height + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
  88                         *buffer = image;
  89                 }
  90                 else if ( *format == mlt_image_rgb24 )
  91                 {
  92                         *buffer = rgb;
  93                 }
  94         }
  95         else
  96         {
  97                 mlt_frame_get_image( this, buffer, format, width, height, writable );
  98         }
  99
 100         return 0;
 101 }
 102
 103 FILE *producer_ppm_run_video( producer_ppm this )
 104 {
 105         if ( this->video == NULL )
 106         {
 107                 if ( this->command == NULL )
 108                 {
 109                         this->video = popen( "image2raw -k -r 25 -ppm /usr/share/pixmaps/*.png", "r" );
 110                 }
 111                 else
 112                 {
 113                         char command[ 1024 ];
 114                         float fps = mlt_producer_get_fps( &this->parent );
 115                         float position = mlt_producer_position( &this->parent );
 116                         sprintf( command, "ffmpeg -i \"%s\" -ss %f -f imagepipe -r %f -img ppm - 2>/dev/null", this->command, position, fps );
 117                         this->video = popen( command, "r" );
 118                 }
 119         }
 120         return this->video;
 121 }
 122
 123 FILE *producer_ppm_run_audio( producer_ppm this )
 124 {
 125         if ( this->audio == NULL )
 126         {
 127                 if ( this->command != NULL )
 128                 {
 129                         char command[ 1024 ];
 130                         float position = mlt_producer_position( &this->parent );
 131                         sprintf( command, "ffmpeg -i \"%s\" -ss %f -f s16le -ar 48000 -ac 2 - 2>/dev/null", this->command, position );
 132                         this->audio = popen( command, "r" );
 133                 }
 134         }
 135         return this->audio;
 136 }
 137
 138 static void producer_ppm_position( producer_ppm this, uint64_t requested )
 139 {
 140         if ( requested != this->expected )
 141         {
 142                 if ( this->video != NULL )
 143                         pclose( this->video );
 144                 this->video = NULL;
 145                 if ( this->audio != NULL )
 146                         pclose( this->audio );
 147                 this->audio = NULL;
 148         }
 149
 150         // This is the next frame we expect
 151         this->expected = mlt_producer_frame( &this->parent ) + 1;
 152
 153         // Open the pipe
 154         this->video = producer_ppm_run_video( this );
 155
 156         // Open the audio pipe
 157         this->audio = producer_ppm_run_audio( this );
 158
 159 }
 160
 161 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 162 {
 163         // Get the frames properties
 164         mlt_properties properties = MLT_FRAME_PROPERTIES( this );
 165
 166         FILE *pipe = mlt_properties_get_data( properties, "audio.pipe", NULL );
 167
 168         *frequency = 48000;
 169         *channels = 2;
 170         *samples = 1920;
 171
 172         // Size
 173         int size = *samples * *channels * 2;
 174
 175         // Allocate an image
 176         *buffer = malloc( size );
 177
 178         // Read it
 179         if ( pipe != NULL )
 180                 fread( *buffer, size, 1, pipe );
 181         else
 182                 memset( *buffer, 0, size );
 183
 184         // Pass the data on the frame properties
 185         mlt_properties_set_data( properties, "audio", *buffer, size, free, NULL );
 186
 187         return 0;
 188 }
 189
 190 static int read_ppm_header( FILE *video, int *width, int *height )
 191 {
 192         int count = 0;
 193         {
 194                 char temp[ 132 ];
 195                 fgets( temp, 132, video );
 196                 fgets( temp, 132, video );
 197                 count += sscanf( temp, "%d %d", width, height );
 198                 fgets( temp, 132, video );
 199         }
 200         return count;
 201 }
 202
 203 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 204 {
 205         producer_ppm this = producer->child;
 206         int width;
 207         int height;
 208
 209         // Construct a test frame
 210         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
 211
 212         // Are we at the position expected?
 213         producer_ppm_position( this, mlt_producer_frame( producer ) );
 214
 215         // Get the frames properties
 216         mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
 217
 218         FILE *video = this->video;
 219         FILE *audio = this->audio;
 220
 221         // Read the video
 222         if ( video != NULL && read_ppm_header( video, &width, &height ) == 2 )
 223         {
 224                 // Allocate an image
 225                 uint8_t *image = mlt_pool_alloc( width * ( height + 1 ) * 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 + 1 ) * 3, ( mlt_destructor )mlt_pool_release, 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                 mlt_properties_set_int( properties, "progressive", 1 );
 236                 mlt_properties_set_double( properties, "aspect_ratio", 1 );
 237
 238                 // Push the image callback
 239                 mlt_frame_push_get_image( *frame, producer_get_image );
 240         }
 241         else
 242         {
 243                 // Push the image callback
 244                 mlt_frame_push_get_image( *frame, producer_get_image );
 245         }
 246
 247         // Set the audio pipe
 248         mlt_properties_set_data( properties, "audio.pipe", audio, 0, NULL, NULL );
 249
 250         // Hmm - register audio callback
 251         mlt_frame_push_audio( *frame, producer_get_audio );
 252
 253         // Update timecode on the frame we're creating
 254         mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 255
 256         // Calculate the next timecode
 257         mlt_producer_prepare_next( producer );
 258
 259         return 0;
 260 }
 261
 262 static void producer_close( mlt_producer parent )
 263 {
 264         producer_ppm this = parent->child;
 265         if ( this->video )
 266                 pclose( this->video );
 267         if ( this->audio )
 268                 pclose( this->audio );
 269         free( this->command );
 270         parent->close = NULL;
 271         mlt_producer_close( parent );
 272         free( this );
 273 }