research.m1stereo.tv/gitweb/ - melted/blob - src/modules/vorbis/producer_vorbis.c

   1 /*
   2  * producer_vorbis.c -- vorbis producer
   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 // MLT Header files
  22 #include <framework/mlt_producer.h>
  23 #include <framework/mlt_frame.h>
  24
  25 // vorbis Header files
  26 #include <vorbis/codec.h>
  27 #include <vorbis/vorbisfile.h>
  28
  29 // System header files
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <ctype.h>
  33
  34 // Forward references.
  35 static int producer_open( mlt_producer this, mlt_profile profile, char *file );
  36 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
  37
  38 /** Structure for metadata reading
  39 */
  40
  41 typedef struct _sw_metadata sw_metadata;
  42
  43 struct _sw_metadata {
  44         char * name;
  45         char * content;
  46 };
  47
  48 static sw_metadata *vorbis_metadata_from_str (char * str)
  49 {
  50         sw_metadata * meta = NULL;
  51         int i;
  52
  53         for (i = 0; str[i]; i++) {
  54                 str[i] = tolower(str[i]);
  55                 if (str[i] == '=') {
  56                         str[i] = '\0';
  57                         meta = malloc (sizeof (sw_metadata));
  58                         meta->name = malloc( strlen(str) + 18 );
  59                         sprintf(meta->name, "meta.attr.%s.markup", str);
  60                         meta->content = strdup (&str[i+1]);
  61                         break;
  62                 }
  63         }
  64         return meta;
  65 }
  66
  67 /** Constructor for libvorbis.
  68 */
  69
  70 mlt_producer producer_vorbis_init( mlt_profile profile, mlt_service_type type, const char *id, char *file )
  71 {
  72         mlt_producer this = NULL;
  73
  74         // Check that we have a non-NULL argument
  75         if ( file != NULL )
  76         {
  77                 // Construct the producer
  78                 this = calloc( 1, sizeof( struct mlt_producer_s ) );
  79
  80                 // Initialise it
  81                 if ( mlt_producer_init( this, NULL ) == 0 )
  82                 {
  83                         // Get the properties
  84                         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
  85
  86                         // Set the resource property (required for all producers)
  87                         mlt_properties_set( properties, "resource", file );
  88
  89                         // Register our get_frame implementation
  90                         this->get_frame = producer_get_frame;
  91
  92                         // Open the file
  93                         if ( producer_open( this, profile, file ) != 0 )
  94                         {
  95                                 // Clean up
  96                                 mlt_producer_close( this );
  97                                 this = NULL;
  98                         }
  99                 }
 100         }
 101
 102         return this;
 103 }
 104
 105 /** Destuctor for ogg files.
 106 */
 107
 108 static void producer_file_close( void *file )
 109 {
 110         if ( file != NULL )
 111         {
 112                 // Close the ogg vorbis structure
 113                 ov_clear( file );
 114
 115                 // Free the memory
 116                 free( file );
 117         }
 118 }
 119
 120 /** Open the file.
 121 */
 122
 123 static int producer_open( mlt_producer this, mlt_profile profile, char *file )
 124 {
 125         // FILE pointer for file
 126         FILE *input = fopen( file, "r" );
 127
 128         // Error code to return
 129         int error = input == NULL;
 130
 131         // Continue if file is open
 132         if ( error == 0 )
 133         {
 134                 // OggVorbis file structure
 135                 OggVorbis_File *ov = calloc( 1, sizeof( OggVorbis_File ) );
 136
 137                 // Attempt to open the stream
 138                 error = ov == NULL || ov_open( input, ov, NULL, 0 ) != 0;
 139
 140                 // Assign to producer properties if successful
 141                 if ( error == 0 )
 142                 {
 143                         // Get the properties
 144                         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 145
 146                         // Assign the ov structure
 147                         mlt_properties_set_data( properties, "ogg_vorbis_file", ov, 0, producer_file_close, NULL );
 148
 149                         // Read metadata
 150                         sw_metadata * metadata = NULL;
 151                         char **ptr = ov_comment(ov, -1)->user_comments;
 152                         while(*ptr) {
 153                                 metadata = vorbis_metadata_from_str (*ptr);
 154                                 if (metadata != NULL)
 155                                         mlt_properties_set(properties, metadata->name, metadata->content);
 156                                 ++ptr;
 157                         }
 158
 159                         if ( ov_seekable( ov ) )
 160                         {
 161                                 // Get the length of the file
 162                         double length = ov_time_total( ov, -1 );
 163
 164                                 // We will treat everything with the producer fps
 165                                 double fps = mlt_profile_fps( profile );
 166
 167                                 // Set out and length of file
 168                                 mlt_properties_set_position( properties, "out", ( length * fps ) - 1 );
 169                                 mlt_properties_set_position( properties, "length", ( length * fps ) );
 170
 171                                 // Get the vorbis info
 172                                 vorbis_info *vi = ov_info( ov, -1 );
 173                                 mlt_properties_set_int( properties, "frequency", (int) vi->rate );
 174                                 mlt_properties_set_int( properties, "channels", vi->channels );
 175                         }
 176                 }
 177                 else
 178                 {
 179                         // Clean up
 180                         free( ov );
 181
 182                         // Must close input file when open fails
 183                         fclose( input );
 184                 }
 185         }
 186
 187         return error;
 188 }
 189
 190 /** Convert a frame position to a time code.
 191 */
 192
 193 static double producer_time_of_frame( mlt_producer this, mlt_position position )
 194 {
 195         return ( double )position / mlt_producer_get_fps( this );
 196 }
 197
 198 /** Get the audio from a frame.
 199 */
 200
 201 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 202 {
 203         // Get the properties from the frame
 204         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 205
 206         // Obtain the frame number of this frame
 207         mlt_position position = mlt_properties_get_position( frame_properties, "vorbis_position" );
 208
 209         // Get the producer
 210         mlt_producer this = mlt_frame_pop_audio( frame );
 211
 212         // Get the producer properties
 213         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 214
 215         // Get the ogg vorbis file
 216         OggVorbis_File *ov = mlt_properties_get_data( properties, "ogg_vorbis_file", NULL );
 217
 218         // Obtain the expected frame numer
 219         mlt_position expected = mlt_properties_get_position( properties, "audio_expected" );
 220
 221         // Get the fps for this producer
 222         double fps = mlt_producer_get_fps( this );
 223
 224         // Get the vorbis info
 225         vorbis_info *vi = ov_info( ov, -1 );
 226
 227         // Obtain the audio buffer
 228         int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
 229
 230         // Get amount of audio used
 231         int audio_used =  mlt_properties_get_int( properties, "audio_used" );
 232
 233         // Number of frames to ignore (for ffwd)
 234         int ignore = 0;
 235
 236         // Flag for paused (silence)
 237         int paused = 0;
 238
 239         // Check for audio buffer and create if necessary
 240         if ( audio_buffer == NULL )
 241         {
 242                 // Allocate the audio buffer
 243                 audio_buffer = mlt_pool_alloc( 131072 * sizeof( int16_t ) );
 244
 245                 // And store it on properties for reuse
 246                 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, mlt_pool_release, NULL );
 247         }
 248
 249         // Seek if necessary
 250         if ( position != expected )
 251         {
 252                 if ( position + 1 == expected )
 253                 {
 254                         // We're paused - silence required
 255                         paused = 1;
 256                 }
 257                 else if ( position > expected && ( position - expected ) < 250 )
 258                 {
 259                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
 260                         ignore = position - expected;
 261                 }
 262                 else
 263                 {
 264                         // Seek to the required position
 265                         ov_time_seek( ov, producer_time_of_frame( this, position ) );
 266                         expected = position;
 267                         audio_used = 0;
 268                 }
 269         }
 270
 271         // Return info in frame
 272         *frequency = vi->rate;
 273         *channels = vi->channels;
 274
 275         // Get the audio if required
 276         if ( !paused )
 277         {
 278                 // Bitstream section
 279                 int current_section;
 280
 281                 // Get the number of samples for the current frame
 282                 *samples = mlt_sample_calculator( fps, *frequency, expected ++ );
 283
 284                 while( *samples > audio_used  )
 285                 {
 286                         // Read the samples
 287                         int bytes = ov_read( ov, ( char * )( &audio_buffer[ audio_used * 2 ] ), 4096, 0, 2, 1, &current_section );
 288
 289                         // Break if error or eof
 290                         if ( bytes <= 0 )
 291                                 break;
 292
 293                         // Increment number of samples used
 294                         audio_used += bytes / ( sizeof( int16_t ) * *channels );
 295
 296                         // Handle ignore
 297                         while ( ignore && audio_used >= *samples )
 298                         {
 299                                 ignore --;
 300                                 audio_used -= *samples;
 301                                 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
 302                                 *samples = mlt_sample_calculator( fps, *frequency, expected ++ );
 303                         }
 304                 }
 305
 306                 // Now handle the audio if we have enough
 307                 if ( audio_used >= *samples )
 308                 {
 309                         *buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
 310                         memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
 311                         audio_used -= *samples;
 312                         memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
 313                         mlt_properties_set_data( frame_properties, "audio", *buffer, 0, mlt_pool_release, NULL );
 314                 }
 315                 else
 316                 {
 317                         mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
 318                         audio_used = 0;
 319                 }
 320
 321                 // Store the number of audio samples still available
 322                 mlt_properties_set_int( properties, "audio_used", audio_used );
 323         }
 324         else
 325         {
 326                 // Get silence and don't touch the context
 327                 *samples = mlt_sample_calculator( fps, *frequency, position );
 328                 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
 329         }
 330
 331         // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
 332         mlt_properties_set_position( properties, "audio_expected", position + 1 );
 333
 334         return 0;
 335 }
 336
 337 /** Our get frame implementation.
 338 */
 339
 340 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
 341 {
 342         // Create an empty frame
 343         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
 344
 345         // Update timecode on the frame we're creating
 346         mlt_frame_set_position( *frame, mlt_producer_position( this ) );
 347
 348         // Set the position of this producer
 349         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( *frame );
 350         mlt_properties_set_position( frame_properties, "vorbis_position", mlt_producer_frame( this ) );
 351
 352         // Set up the audio
 353         mlt_frame_push_audio( *frame, this );
 354         mlt_frame_push_audio( *frame, producer_get_audio );
 355
 356         // Pass audio properties to the frame
 357         mlt_properties_pass_list( frame_properties, MLT_PRODUCER_PROPERTIES( this ), "frequency, channels" );
 358
 359         // Calculate the next timecode
 360         mlt_producer_prepare_next( this );
 361
 362         return 0;
 363 }