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 // Local header files
  22 #include "producer_vorbis.h"
  23
  24 // MLT Header files
  25 #include <framework/mlt_frame.h>
  26
  27 // vorbis Header files
  28 #include <vorbis/codec.h>
  29 #include <vorbis/vorbisfile.h>
  30
  31 // System header files
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <ctype.h>
  35
  36 // Forward references.
  37 static int producer_open( mlt_producer this, char *file );
  38 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
  39
  40 /** Structure for metadata reading
  41 */
  42
  43 typedef struct _sw_metadata sw_metadata;
  44
  45 struct _sw_metadata {
  46         char * name;
  47         char * content;
  48 };
  49
  50 static sw_metadata *vorbis_metadata_from_str (char * str)
  51 {
  52         sw_metadata * meta = NULL;
  53         int i;
  54
  55         for (i = 0; str[i]; i++) {
  56                 str[i] = tolower(str[i]);
  57                 if (str[i] == '=') {
  58                         str[i] = '\0';
  59                         meta = malloc (sizeof (sw_metadata));
  60                         meta->name = malloc( strlen(str) + 18 );
  61                         sprintf(meta->name, "meta.attr.%s.markup", str);
  62                         meta->content = strdup (&str[i+1]);
  63                         break;
  64                 }
  65         }
  66         return meta;
  67 }
  68
  69 /** Constructor for libvorbis.
  70 */
  71
  72 mlt_producer producer_vorbis_init( char *file )
  73 {
  74         mlt_producer this = NULL;
  75
  76         // Check that we have a non-NULL argument
  77         if ( file != NULL )
  78         {
  79                 // Construct the producer
  80                 this = calloc( 1, sizeof( struct mlt_producer_s ) );
  81
  82                 // Initialise it
  83                 if ( mlt_producer_init( this, NULL ) == 0 )
  84                 {
  85                         // Get the properties
  86                         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
  87
  88                         // Set the resource property (required for all producers)
  89                         mlt_properties_set( properties, "resource", file );
  90
  91                         // Register our get_frame implementation
  92                         this->get_frame = producer_get_frame;
  93
  94                         // Open the file
  95                         if ( producer_open( this, file ) != 0 )
  96                         {
  97                                 // Clean up
  98                                 mlt_producer_close( this );
  99                                 this = NULL;
 100                         }
 101                 }
 102         }
 103
 104         return this;
 105 }
 106
 107 /** Destuctor for ogg files.
 108 */
 109
 110 static void producer_file_close( void *file )
 111 {
 112         if ( file != NULL )
 113         {
 114                 // Close the ogg vorbis structure
 115                 ov_clear( file );
 116
 117                 // Free the memory
 118                 free( file );
 119         }
 120 }
 121
 122 /** Open the file.
 123 */
 124
 125 static int producer_open( mlt_producer this, char *file )
 126 {
 127         // FILE pointer for file
 128         FILE *input = fopen( file, "r" );
 129
 130         // Error code to return
 131         int error = input == NULL;
 132
 133         // Continue if file is open
 134         if ( error == 0 )
 135         {
 136                 // OggVorbis file structure
 137                 OggVorbis_File *ov = calloc( 1, sizeof( OggVorbis_File ) );
 138
 139                 // Attempt to open the stream
 140                 error = ov == NULL || ov_open( input, ov, NULL, 0 ) != 0;
 141
 142                 // Assign to producer properties if successful
 143                 if ( error == 0 )
 144                 {
 145                         // Get the properties
 146                         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 147
 148                         // Assign the ov structure
 149                         mlt_properties_set_data( properties, "ogg_vorbis_file", ov, 0, producer_file_close, NULL );
 150
 151                         // Read metadata
 152                         sw_metadata * metadata = NULL;
 153                         char **ptr = ov_comment(ov, -1)->user_comments;
 154                         while(*ptr) {
 155                                 metadata = vorbis_metadata_from_str (*ptr);
 156                                 if (metadata != NULL)
 157                                         mlt_properties_set(properties, metadata->name, metadata->content);
 158                                 ++ptr;
 159                         }
 160
 161                         if ( ov_seekable( ov ) )
 162                         {
 163                                 // Get the length of the file
 164                         double length = ov_time_total( ov, -1 );
 165
 166                                 // We will treat everything with the producer fps
 167                                 double fps = mlt_properties_get_double( properties, "fps" );
 168
 169                                 // Set out and length of file
 170                                 mlt_properties_set_position( properties, "out", ( length * fps ) - 1 );
 171                                 mlt_properties_set_position( properties, "length", ( length * fps ) );
 172
 173                                 // Get the vorbis info
 174                                 vorbis_info *vi = ov_info( ov, -1 );
 175                                 mlt_properties_set_int( properties, "frequency", (int) vi->rate );
 176                                 mlt_properties_set_int( properties, "channels", vi->channels );
 177                         }
 178                 }
 179                 else
 180                 {
 181                         // Clean up
 182                         free( ov );
 183
 184                         // Must close input file when open fails
 185                         fclose( input );
 186                 }
 187         }
 188
 189         return error;
 190 }
 191
 192 /** Convert a frame position to a time code.
 193 */
 194
 195 static double producer_time_of_frame( mlt_producer this, mlt_position position )
 196 {
 197         // Get the properties
 198         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 199
 200         // Obtain the fps
 201         double fps = mlt_properties_get_double( properties, "fps" );
 202
 203         // Do the calc
 204         return ( double )position / fps;
 205 }
 206
 207 /** Get the audio from a frame.
 208 */
 209
 210 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 211 {
 212         // Get the properties from the frame
 213         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 214
 215         // Obtain the frame number of this frame
 216         mlt_position position = mlt_properties_get_position( frame_properties, "vorbis_position" );
 217
 218         // Get the producer
 219         mlt_producer this = mlt_frame_pop_audio( frame );
 220
 221         // Get the producer properties
 222         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 223
 224         // Get the ogg vorbis file
 225         OggVorbis_File *ov = mlt_properties_get_data( properties, "ogg_vorbis_file", NULL );
 226
 227         // Obtain the expected frame numer
 228         mlt_position expected = mlt_properties_get_position( properties, "audio_expected" );
 229
 230         // Get the fps for this producer
 231         double fps = mlt_properties_get_double( properties, "fps" );
 232
 233         // Get the vorbis info
 234         vorbis_info *vi = ov_info( ov, -1 );
 235
 236         // Obtain the audio buffer
 237         int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
 238
 239         // Get amount of audio used
 240         int audio_used =  mlt_properties_get_int( properties, "audio_used" );
 241
 242         // Number of frames to ignore (for ffwd)
 243         int ignore = 0;
 244
 245         // Flag for paused (silence)
 246         int paused = 0;
 247
 248         // Check for audio buffer and create if necessary
 249         if ( audio_buffer == NULL )
 250         {
 251                 // Allocate the audio buffer
 252                 audio_buffer = mlt_pool_alloc( 131072 * sizeof( int16_t ) );
 253
 254                 // And store it on properties for reuse
 255                 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, mlt_pool_release, NULL );
 256         }
 257
 258         // Seek if necessary
 259         if ( position != expected )
 260         {
 261                 if ( position + 1 == expected )
 262                 {
 263                         // We're paused - silence required
 264                         paused = 1;
 265                 }
 266                 else if ( position > expected && ( position - expected ) < 250 )
 267                 {
 268                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
 269                         ignore = position - expected;
 270                 }
 271                 else
 272                 {
 273                         // Seek to the required position
 274                         ov_time_seek( ov, producer_time_of_frame( this, position ) );
 275                         expected = position;
 276                         audio_used = 0;
 277                 }
 278         }
 279
 280         // Return info in frame
 281         *frequency = vi->rate;
 282         *channels = vi->channels;
 283
 284         // Get the audio if required
 285         if ( !paused )
 286         {
 287                 // Bitstream section
 288                 int current_section;
 289
 290                 // Get the number of samples for the current frame
 291                 *samples = mlt_sample_calculator( fps, *frequency, expected ++ );
 292
 293                 while( *samples > audio_used  )
 294                 {
 295                         // Read the samples
 296                         int bytes = ov_read( ov, ( char * )( &audio_buffer[ audio_used * 2 ] ), 4096, 0, 2, 1, &current_section );
 297
 298                         // Break if error or eof
 299                         if ( bytes <= 0 )
 300                                 break;
 301
 302                         // Increment number of samples used
 303                         audio_used += bytes / ( sizeof( int16_t ) * *channels );
 304
 305                         // Handle ignore
 306                         while ( ignore && audio_used >= *samples )
 307                         {
 308                                 ignore --;
 309                                 audio_used -= *samples;
 310                                 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
 311                                 *samples = mlt_sample_calculator( fps, *frequency, expected ++ );
 312                         }
 313                 }
 314
 315                 // Now handle the audio if we have enough
 316                 if ( audio_used >= *samples )
 317                 {
 318                         *buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
 319                         memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
 320                         audio_used -= *samples;
 321                         memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
 322                         mlt_properties_set_data( frame_properties, "audio", *buffer, 0, mlt_pool_release, NULL );
 323                 }
 324                 else
 325                 {
 326                         mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
 327                         audio_used = 0;
 328                 }
 329
 330                 // Store the number of audio samples still available
 331                 mlt_properties_set_int( properties, "audio_used", audio_used );
 332         }
 333         else
 334         {
 335                 // Get silence and don't touch the context
 336                 *samples = mlt_sample_calculator( fps, *frequency, position );
 337                 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
 338         }
 339
 340         // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
 341         mlt_properties_set_position( properties, "audio_expected", position + 1 );
 342
 343         return 0;
 344 }
 345
 346 /** Our get frame implementation.
 347 */
 348
 349 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
 350 {
 351         // Create an empty frame
 352         *frame = mlt_frame_init( );
 353
 354         // Update timecode on the frame we're creating
 355         mlt_frame_set_position( *frame, mlt_producer_position( this ) );
 356
 357         // Set the position of this producer
 358         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( *frame );
 359         mlt_properties_set_position( frame_properties, "vorbis_position", mlt_producer_frame( this ) );
 360
 361         // Set up the audio
 362         mlt_frame_push_audio( *frame, this );
 363         mlt_frame_push_audio( *frame, producer_get_audio );
 364
 365         // Pass audio properties to the frame
 366         mlt_properties_pass_list( frame_properties, MLT_PRODUCER_PROPERTIES( this ), "frequency, channels" );
 367
 368         // Calculate the next timecode
 369         mlt_producer_prepare_next( this );
 370
 371         return 0;
 372 }