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_producer_get_fps( this );
 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         return ( double )position / mlt_producer_get_fps( this );
 198 }
 199
 200 /** Get the audio from a frame.
 201 */
 202
 203 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 204 {
 205         // Get the properties from the frame
 206         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 207
 208         // Obtain the frame number of this frame
 209         mlt_position position = mlt_properties_get_position( frame_properties, "vorbis_position" );
 210
 211         // Get the producer
 212         mlt_producer this = mlt_frame_pop_audio( frame );
 213
 214         // Get the producer properties
 215         mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
 216
 217         // Get the ogg vorbis file
 218         OggVorbis_File *ov = mlt_properties_get_data( properties, "ogg_vorbis_file", NULL );
 219
 220         // Obtain the expected frame numer
 221         mlt_position expected = mlt_properties_get_position( properties, "audio_expected" );
 222
 223         // Get the fps for this producer
 224         double fps = mlt_producer_get_fps( this );
 225
 226         // Get the vorbis info
 227         vorbis_info *vi = ov_info( ov, -1 );
 228
 229         // Obtain the audio buffer
 230         int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
 231
 232         // Get amount of audio used
 233         int audio_used =  mlt_properties_get_int( properties, "audio_used" );
 234
 235         // Number of frames to ignore (for ffwd)
 236         int ignore = 0;
 237
 238         // Flag for paused (silence)
 239         int paused = 0;
 240
 241         // Check for audio buffer and create if necessary
 242         if ( audio_buffer == NULL )
 243         {
 244                 // Allocate the audio buffer
 245                 audio_buffer = mlt_pool_alloc( 131072 * sizeof( int16_t ) );
 246
 247                 // And store it on properties for reuse
 248                 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, mlt_pool_release, NULL );
 249         }
 250
 251         // Seek if necessary
 252         if ( position != expected )
 253         {
 254                 if ( position + 1 == expected )
 255                 {
 256                         // We're paused - silence required
 257                         paused = 1;
 258                 }
 259                 else if ( position > expected && ( position - expected ) < 250 )
 260                 {
 261                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
 262                         ignore = position - expected;
 263                 }
 264                 else
 265                 {
 266                         // Seek to the required position
 267                         ov_time_seek( ov, producer_time_of_frame( this, position ) );
 268                         expected = position;
 269                         audio_used = 0;
 270                 }
 271         }
 272
 273         // Return info in frame
 274         *frequency = vi->rate;
 275         *channels = vi->channels;
 276
 277         // Get the audio if required
 278         if ( !paused )
 279         {
 280                 // Bitstream section
 281                 int current_section;
 282
 283                 // Get the number of samples for the current frame
 284                 *samples = mlt_sample_calculator( fps, *frequency, expected ++ );
 285
 286                 while( *samples > audio_used  )
 287                 {
 288                         // Read the samples
 289                         int bytes = ov_read( ov, ( char * )( &audio_buffer[ audio_used * 2 ] ), 4096, 0, 2, 1, &current_section );
 290
 291                         // Break if error or eof
 292                         if ( bytes <= 0 )
 293                                 break;
 294
 295                         // Increment number of samples used
 296                         audio_used += bytes / ( sizeof( int16_t ) * *channels );
 297
 298                         // Handle ignore
 299                         while ( ignore && audio_used >= *samples )
 300                         {
 301                                 ignore --;
 302                                 audio_used -= *samples;
 303                                 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
 304                                 *samples = mlt_sample_calculator( fps, *frequency, expected ++ );
 305                         }
 306                 }
 307
 308                 // Now handle the audio if we have enough
 309                 if ( audio_used >= *samples )
 310                 {
 311                         *buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
 312                         memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
 313                         audio_used -= *samples;
 314                         memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
 315                         mlt_properties_set_data( frame_properties, "audio", *buffer, 0, mlt_pool_release, NULL );
 316                 }
 317                 else
 318                 {
 319                         mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
 320                         audio_used = 0;
 321                 }
 322
 323                 // Store the number of audio samples still available
 324                 mlt_properties_set_int( properties, "audio_used", audio_used );
 325         }
 326         else
 327         {
 328                 // Get silence and don't touch the context
 329                 *samples = mlt_sample_calculator( fps, *frequency, position );
 330                 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
 331         }
 332
 333         // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
 334         mlt_properties_set_position( properties, "audio_expected", position + 1 );
 335
 336         return 0;
 337 }
 338
 339 /** Our get frame implementation.
 340 */
 341
 342 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
 343 {
 344         // Create an empty frame
 345         *frame = mlt_frame_init( );
 346
 347         // Update timecode on the frame we're creating
 348         mlt_frame_set_position( *frame, mlt_producer_position( this ) );
 349
 350         // Set the position of this producer
 351         mlt_properties frame_properties = MLT_FRAME_PROPERTIES( *frame );
 352         mlt_properties_set_position( frame_properties, "vorbis_position", mlt_producer_frame( this ) );
 353
 354         // Set up the audio
 355         mlt_frame_push_audio( *frame, this );
 356         mlt_frame_push_audio( *frame, producer_get_audio );
 357
 358         // Pass audio properties to the frame
 359         mlt_properties_pass_list( frame_properties, MLT_PRODUCER_PROPERTIES( this ), "frequency, channels" );
 360
 361         // Calculate the next timecode
 362         mlt_producer_prepare_next( this );
 363
 364         return 0;
 365 }