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 #include <framework/mlt_profile.h>
  25
  26 // vorbis Header files
  27 #include <vorbis/codec.h>
  28 #include <vorbis/vorbisfile.h>
  29
  30 // System header files
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <ctype.h>
  34
  35 // Forward references.
  36 static int producer_open( mlt_producer this, mlt_profile profile, char *file );
  37 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
  38
  39 /** Structure for metadata reading
  40 */
  41
  42 typedef struct _sw_metadata sw_metadata;
  43
  44 struct _sw_metadata {
  45         char * name;
  46         char * content;
  47 };
  48
  49 static sw_metadata *vorbis_metadata_from_str (char * str)
  50 {
  51         sw_metadata * meta = NULL;
  52         int i;
  53
  54         for (i = 0; str[i]; i++) {
  55                 str[i] = tolower(str[i]);
  56                 if (str[i] == '=') {
  57                         str[i] = '\0';
  58                         meta = malloc (sizeof (sw_metadata));
  59                         meta->name = malloc( strlen(str) + 18 );
  60                         sprintf(meta->name, "meta.attr.%s.markup", str);
  61                         meta->content = strdup (&str[i+1]);
  62                         break;
  63                 }
  64         }
  65         return meta;
  66 }
  67
  68 /** Constructor for libvorbis.
  69 */
  70
  71 mlt_producer producer_vorbis_init( mlt_profile profile, mlt_service_type type, const char *id, char *file )
  72 {
  73         mlt_producer this = NULL;
  74
  75         // Check that we have a non-NULL argument
  76         if ( file != NULL )
  77         {
  78                 // Construct the producer
  79                 this = calloc( 1, sizeof( struct mlt_producer_s ) );
  80
  81                 // Initialise it
  82                 if ( mlt_producer_init( this, NULL ) == 0 )
  83                 {
  84                         // Get the properties
  85                         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
  86
  87                         // Set the resource property (required for all producers)
  88                         mlt_properties_set( properties, "resource", file );
  89
  90                         // Register our get_frame implementation
  91                         this->get_frame = producer_get_frame;
  92
  93                         // Open the file
  94                         if ( producer_open( this, profile, file ) != 0 )
  95                         {
  96                                 // Clean up
  97                                 mlt_producer_close( this );
  98                                 this = NULL;
  99                         }
 100                 }
 101         }
 102
 103         return this;
 104 }
 105
 106 /** Destuctor for ogg files.
 107 */
 108
 109 static void producer_file_close( void *file )
 110 {
 111         if ( file != NULL )
 112         {
 113                 // Close the ogg vorbis structure
 114                 ov_clear( file );
 115
 116                 // Free the memory
 117                 free( file );
 118         }
 119 }
 120
 121 /** Open the file.
 122 */
 123
 124 static int producer_open( mlt_producer this, mlt_profile profile, char *file )
 125 {
 126         // FILE pointer for file
 127         FILE *input = fopen( file, "r" );
 128
 129         // Error code to return
 130         int error = input == NULL;
 131
 132         // Continue if file is open
 133         if ( error == 0 )
 134         {
 135                 // OggVorbis file structure
 136                 OggVorbis_File *ov = calloc( 1, sizeof( OggVorbis_File ) );
 137
 138                 // Attempt to open the stream
 139                 error = ov == NULL || ov_open( input, ov, NULL, 0 ) != 0;
 140
 141                 // Assign to producer properties if successful
 142                 if ( error == 0 )
 143                 {
 144                         // Get the properties
 145                         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 146
 147                         // Assign the ov structure
 148                         mlt_properties_set_data( properties, "ogg_vorbis_file", ov, 0, producer_file_close, NULL );
 149
 150                         // Read metadata
 151                         sw_metadata * metadata = NULL;
 152                         char **ptr = ov_comment(ov, -1)->user_comments;
 153                         while(*ptr) {
 154                                 metadata = vorbis_metadata_from_str (*ptr);
 155                                 if (metadata != NULL)
 156                                         mlt_properties_set(properties, metadata->name, metadata->content);
 157                                 ++ptr;
 158                         }
 159
 160                         if ( ov_seekable( ov ) )
 161                         {
 162                                 // Get the length of the file
 163                         double length = ov_time_total( ov, -1 );
 164
 165                                 // We will treat everything with the producer fps
 166                                 double fps = mlt_profile_fps( profile );
 167
 168                                 // Set out and length of file
 169                                 mlt_properties_set_position( properties, "out", ( length * fps ) - 1 );
 170                                 mlt_properties_set_position( properties, "length", ( length * fps ) );
 171
 172                                 // Get the vorbis info
 173                                 vorbis_info *vi = ov_info( ov, -1 );
 174                                 mlt_properties_set_int( properties, "frequency", (int) vi->rate );
 175                                 mlt_properties_set_int( properties, "channels", vi->channels );
 176
 177                                 // Set some media metadata
 178                                 mlt_properties_set_int( properties, "meta.media.nb_streams", 1 );
 179                                 mlt_properties_set_int( properties, "audio_index", 0 );
 180                                 mlt_properties_set( properties, "meta.media.0.stream.type", "audio" );
 181                                 mlt_properties_set( properties, "meta.media.0.codec.name", "vorbis" );
 182                                 mlt_properties_set( properties, "meta.media.0.codec.long_name", "Vorbis" );
 183                         }
 184                 }
 185                 else
 186                 {
 187                         // Clean up
 188                         free( ov );
 189
 190                         // Must close input file when open fails
 191                         fclose( input );
 192                 }
 193         }
 194
 195         return error;
 196 }
 197
 198 /** Convert a frame position to a time code.
 199 */
 200
 201 static double producer_time_of_frame( mlt_producer this, mlt_position position )
 202 {
 203         return ( double )position / mlt_producer_get_fps( this );
 204 }
 205
 206 /** Get the audio from a frame.
 207 */
 208
 209 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 210 {
 211         // Get the properties from the frame
 212         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 213
 214         // Obtain the frame number of this frame
 215         mlt_position position = mlt_properties_get_position( frame_properties, "vorbis_position" );
 216
 217         // Get the producer
 218         mlt_producer this = mlt_frame_pop_audio( frame );
 219
 220         // Get the producer properties
 221         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 222
 223         // Get the ogg vorbis file
 224         OggVorbis_File *ov = mlt_properties_get_data( properties, "ogg_vorbis_file", NULL );
 225
 226         // Obtain the expected frame numer
 227         mlt_position expected = mlt_properties_get_position( properties, "audio_expected" );
 228
 229         // Get the fps for this producer
 230         double fps = mlt_producer_get_fps( this );
 231
 232         // Get the vorbis info
 233         vorbis_info *vi = ov_info( ov, -1 );
 234
 235         // Obtain the audio buffer
 236         int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
 237
 238         // Get amount of audio used
 239         int audio_used =  mlt_properties_get_int( properties, "audio_used" );
 240
 241         // Number of frames to ignore (for ffwd)
 242         int ignore = 0;
 243
 244         // Flag for paused (silence)
 245         int paused = 0;
 246
 247         // Check for audio buffer and create if necessary
 248         if ( audio_buffer == NULL )
 249         {
 250                 // Allocate the audio buffer
 251                 audio_buffer = mlt_pool_alloc( 131072 * sizeof( int16_t ) );
 252
 253                 // And store it on properties for reuse
 254                 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, mlt_pool_release, NULL );
 255         }
 256
 257         // Seek if necessary
 258         if ( position != expected )
 259         {
 260                 if ( position + 1 == expected )
 261                 {
 262                         // We're paused - silence required
 263                         paused = 1;
 264                 }
 265                 else if ( position > expected && ( position - expected ) < 250 )
 266                 {
 267                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
 268                         ignore = position - expected;
 269                 }
 270                 else
 271                 {
 272                         // Seek to the required position
 273                         ov_time_seek( ov, producer_time_of_frame( this, position ) );
 274                         expected = position;
 275                         audio_used = 0;
 276                 }
 277         }
 278
 279         // Return info in frame
 280         *frequency = vi->rate;
 281         *channels = vi->channels;
 282
 283         // Get the audio if required
 284         if ( !paused )
 285         {
 286                 // Bitstream section
 287                 int current_section;
 288
 289                 // Get the number of samples for the current frame
 290                 *samples = mlt_sample_calculator( fps, *frequency, expected ++ );
 291
 292                 while( *samples > audio_used  )
 293                 {
 294                         // Read the samples
 295                         int bytes = ov_read( ov, ( char * )( &audio_buffer[ audio_used * 2 ] ), 4096, 0, 2, 1, &current_section );
 296
 297                         // Break if error or eof
 298                         if ( bytes <= 0 )
 299                                 break;
 300
 301                         // Increment number of samples used
 302                         audio_used += bytes / ( sizeof( int16_t ) * *channels );
 303
 304                         // Handle ignore
 305                         while ( ignore && audio_used >= *samples )
 306                         {
 307                                 ignore --;
 308                                 audio_used -= *samples;
 309                                 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
 310                                 *samples = mlt_sample_calculator( fps, *frequency, expected ++ );
 311                         }
 312                 }
 313
 314                 // Now handle the audio if we have enough
 315                 if ( audio_used >= *samples )
 316                 {
 317                         *buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
 318                         memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
 319                         audio_used -= *samples;
 320                         memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
 321                         mlt_properties_set_data( frame_properties, "audio", *buffer, 0, mlt_pool_release, NULL );
 322                 }
 323                 else
 324                 {
 325                         mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
 326                         audio_used = 0;
 327                 }
 328
 329                 // Store the number of audio samples still available
 330                 mlt_properties_set_int( properties, "audio_used", audio_used );
 331         }
 332         else
 333         {
 334                 // Get silence and don't touch the context
 335                 *samples = mlt_sample_calculator( fps, *frequency, position );
 336                 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
 337         }
 338
 339         // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
 340         mlt_properties_set_position( properties, "audio_expected", position + 1 );
 341
 342         return 0;
 343 }
 344
 345 /** Our get frame implementation.
 346 */
 347
 348 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
 349 {
 350         // Create an empty frame
 351         *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
 352
 353         // Update timecode on the frame we're creating
 354         mlt_frame_set_position( *frame, mlt_producer_position( this ) );
 355
 356         // Set the position of this producer
 357         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( *frame );
 358         mlt_properties_set_position( frame_properties, "vorbis_position", mlt_producer_frame( this ) );
 359
 360         // Set up the audio
 361         mlt_frame_push_audio( *frame, this );
 362         mlt_frame_push_audio( *frame, producer_get_audio );
 363
 364         // Pass audio properties to the frame
 365         mlt_properties_pass_list( frame_properties, MLT_PRODUCER_PROPERTIES( this ), "frequency, channels" );
 366
 367         // Calculate the next timecode
 368         mlt_producer_prepare_next( this );
 369
 370         return 0;
 371 }