git.sesse.net Git - mlt/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( 1, sizeof( struct producer_ppm_s ) );
  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                 *buffer = mlt_properties_get_data( properties, "image", NULL );
  77                 *width = mlt_properties_get_int( properties, "width" );
  78                 *height = mlt_properties_get_int( properties, "height" );
  79                 *format = mlt_image_rgb24;
  80         }
  81         else
  82         {
  83                 mlt_frame_get_image( this, buffer, format, width, height, writable );
  84         }
  85
  86         return 0;
  87 }
  88
  89 FILE *producer_ppm_run_video( producer_ppm this )
  90 {
  91         if ( this->video == NULL )
  92         {
  93                 if ( this->command == NULL )
  94                 {
  95                         this->video = popen( "image2raw -k -r 25 -ppm /usr/share/pixmaps/*.png", "r" );
  96                 }
  97                 else
  98                 {
  99                         char command[ 1024 ];
 100                         float fps = mlt_producer_get_fps( &this->parent );
 101                         float position = mlt_producer_position( &this->parent );
 102                         sprintf( command, "ffmpeg -i \"%s\" -ss %f -f image2pipe -r %f -vcodec ppm - 2>/dev/null", this->command, position, fps );
 103                         this->video = popen( command, "r" );
 104                 }
 105         }
 106         return this->video;
 107 }
 108
 109 FILE *producer_ppm_run_audio( producer_ppm this )
 110 {
 111         if ( this->audio == NULL )
 112         {
 113                 if ( this->command != NULL )
 114                 {
 115                         char command[ 1024 ];
 116                         float position = mlt_producer_position( &this->parent );
 117                         sprintf( command, "ffmpeg -i \"%s\" -ss %f -f s16le -ar 48000 -ac 2 - 2>/dev/null", this->command, position );
 118                         this->audio = popen( command, "r" );
 119                 }
 120         }
 121         return this->audio;
 122 }
 123
 124 static void producer_ppm_position( producer_ppm this, uint64_t requested )
 125 {
 126         if ( requested != this->expected )
 127         {
 128                 if ( this->video != NULL )
 129                         pclose( this->video );
 130                 this->video = NULL;
 131                 if ( this->audio != NULL )
 132                         pclose( this->audio );
 133                 this->audio = NULL;
 134         }
 135
 136         // This is the next frame we expect
 137         this->expected = mlt_producer_frame( &this->parent ) + 1;
 138
 139         // Open the pipe
 140         this->video = producer_ppm_run_video( this );
 141
 142         // Open the audio pipe
 143         this->audio = producer_ppm_run_audio( this );
 144
 145 }
 146
 147 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 148 {
 149         // Get the frames properties
 150         mlt_properties properties = MLT_FRAME_PROPERTIES( this );
 151
 152         FILE *pipe = mlt_properties_get_data( properties, "audio.pipe", NULL );
 153
 154         *frequency = 48000;
 155         *channels = 2;
 156         *samples = 1920;
 157
 158         // Size
 159         int size = *samples * *channels * 2;
 160
 161         // Allocate an image
 162         *buffer = malloc( size );
 163
 164         // Read it
 165         if ( pipe != NULL )
 166                 size = fread( *buffer, size, 1, pipe );
 167         else
 168                 memset( *buffer, 0, size );
 169
 170         // Pass the data on the frame properties
 171         mlt_frame_set_audio( this, *buffer, *format, size, free );
 172
 173         return 0;
 174 }
 175
 176 static int read_ppm_header( FILE *video, int *width, int *height )
 177 {
 178         int count = 0;
 179         {
 180                 char temp[ 132 ];
 181                 char *ignore = fgets( temp, 132, video );
 182                 ignore = fgets( temp, 132, video );
 183                 count += sscanf( temp, "%d %d", width, height );
 184                 ignore = fgets( temp, 132, video );
 185         }
 186         return count;
 187 }
 188
 189 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 190 {
 191         producer_ppm this = producer->child;
 192         int width;
 193         int height;
 194
 195         // Construct a test frame
 196         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( producer ) );
 197
 198         // Are we at the position expected?
 199         producer_ppm_position( this, mlt_producer_frame( producer ) );
 200
 201         // Get the frames properties
 202         mlt_properties properties = MLT_FRAME_PROPERTIES( *frame );
 203
 204         FILE *video = this->video;
 205         FILE *audio = this->audio;
 206
 207         // Read the video
 208         if ( video != NULL && read_ppm_header( video, &width, &height ) == 2 )
 209         {
 210                 // Allocate an image
 211                 uint8_t *image = mlt_pool_alloc( width * ( height + 1 ) * 3 );
 212
 213                 // Read it
 214                 size_t ignore;
 215                 ignore = fread( image, width * height * 3, 1, video );
 216
 217                 // Pass the data on the frame properties
 218                 mlt_frame_set_image( *frame, image, width * ( height + 1 ) * 3, mlt_pool_release );
 219                 mlt_properties_set_int( properties, "width", width );
 220                 mlt_properties_set_int( properties, "height", height );
 221                 mlt_properties_set_int( properties, "has_image", 1 );
 222                 mlt_properties_set_int( properties, "progressive", 1 );
 223                 mlt_properties_set_double( properties, "aspect_ratio", 1 );
 224
 225                 // Push the image callback
 226                 mlt_frame_push_get_image( *frame, producer_get_image );
 227         }
 228         else
 229         {
 230                 // Push the image callback
 231                 mlt_frame_push_get_image( *frame, producer_get_image );
 232         }
 233
 234         // Set the audio pipe
 235         mlt_properties_set_data( properties, "audio.pipe", audio, 0, NULL, NULL );
 236
 237         // Hmm - register audio callback
 238         mlt_frame_push_audio( *frame, producer_get_audio );
 239
 240         // Update timecode on the frame we're creating
 241         mlt_frame_set_position( *frame, mlt_producer_position( producer ) );
 242
 243         // Calculate the next timecode
 244         mlt_producer_prepare_next( producer );
 245
 246         return 0;
 247 }
 248
 249 static void producer_close( mlt_producer parent )
 250 {
 251         producer_ppm this = parent->child;
 252         if ( this->video )
 253                 pclose( this->video );
 254         if ( this->audio )
 255                 pclose( this->audio );
 256         free( this->command );
 257         parent->close = NULL;
 258         mlt_producer_close( parent );
 259         free( this );
 260 }