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 program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program 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
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * 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
  35 // Forward references.
  36 static int producer_open( mlt_producer this, char *file );
  37 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
  38
  39 /** Constructor for libvorbis.
  40 */
  41
  42 mlt_producer producer_vorbis_init( char *file )
  43 {
  44         mlt_producer this = NULL;
  45
  46         // Check that we have a non-NULL argument
  47         if ( file != NULL )
  48         {
  49                 // Construct the producer
  50                 this = calloc( 1, sizeof( struct mlt_producer_s ) );
  51
  52                 // Initialise it
  53                 if ( mlt_producer_init( this, NULL ) == 0 )
  54                 {
  55                         // Get the properties
  56                         mlt_properties properties = mlt_producer_properties( this );
  57
  58                         // Set the resource property (required for all producers)
  59                         mlt_properties_set( properties, "resource", file );
  60
  61                         // Register our get_frame implementation
  62                         this->get_frame = producer_get_frame;
  63
  64                         // Open the file
  65                         if ( producer_open( this, file ) != 0 )
  66                         {
  67                                 // Clean up
  68                                 mlt_producer_close( this );
  69                                 this = NULL;
  70                         }
  71                 }
  72         }
  73
  74         return this;
  75 }
  76
  77 /** Destuctor for ogg files.
  78 */
  79
  80 static void producer_file_close( void *file )
  81 {
  82         if ( file != NULL )
  83         {
  84                 // Close the ogg vorbis structure
  85                 ov_clear( file );
  86
  87                 // Free the memory
  88                 free( file );
  89         }
  90 }
  91
  92 /** Open the file.
  93 */
  94
  95 static int producer_open( mlt_producer this, char *file )
  96 {
  97         // FILE pointer for file
  98         FILE *input = fopen( file, "r" );
  99
 100         // Error code to return
 101         int error = input == NULL;
 102
 103         // Continue if file is open
 104         if ( error == 0 )
 105         {
 106                 // OggVorbis file structure
 107                 OggVorbis_File *ov = calloc( 1, sizeof( OggVorbis_File ) );
 108
 109                 // Attempt to open the stream
 110                 error = ov == NULL || ov_open( input, ov, NULL, 0 ) != 0;
 111
 112                 // Assign to producer properties if successful
 113                 if ( error == 0 )
 114                 {
 115                         // Get the properties
 116                         mlt_properties properties = mlt_producer_properties( this );
 117
 118                         // Assign the ov structure
 119                         mlt_properties_set_data( properties, "ogg_vorbis_file", ov, 0, producer_file_close, NULL );
 120
 121                         if ( ov_seekable( ov ) )
 122                         {
 123                                 // Get the length of the file
 124                         double length = ov_time_total( ov, -1 );
 125
 126                                 // We will treat everything with the producer fps
 127                                 double fps = mlt_properties_get_double( properties, "fps" );
 128
 129                                 // Set out and length of file
 130                                 mlt_properties_set_position( properties, "out", ( length * fps ) - 1 );
 131                                 mlt_properties_set_position( properties, "length", ( length * fps ) );
 132                         }
 133                 }
 134                 else
 135                 {
 136                         // Clean up
 137                         free( ov );
 138
 139                         // Must close input file when open fails
 140                         fclose( input );
 141                 }
 142         }
 143
 144         return error;
 145 }
 146
 147 /** Convert a frame position to a time code.
 148 */
 149
 150 static double producer_time_of_frame( mlt_producer this, mlt_position position )
 151 {
 152         // Get the properties
 153         mlt_properties properties = mlt_producer_properties( this );
 154
 155         // Obtain the fps
 156         double fps = mlt_properties_get_double( properties, "fps" );
 157
 158         // Do the calc
 159         return ( double )position / fps;
 160 }
 161
 162 /** Get the audio from a frame.
 163 */
 164
 165 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 166 {
 167         // Get the properties from the frame
 168         mlt_properties frame_properties = mlt_frame_properties( frame );
 169
 170         // Obtain the frame number of this frame
 171         mlt_position position = mlt_properties_get_position( frame_properties, "vorbis_position" );
 172
 173         // Get the producer
 174         mlt_producer this = mlt_properties_get_data( frame_properties, "vorbis_producer", NULL );
 175
 176         // Get the producer properties
 177         mlt_properties properties = mlt_producer_properties( this );
 178
 179         // Get the ogg vorbis file
 180         OggVorbis_File *ov = mlt_properties_get_data( properties, "ogg_vorbis_file", NULL );
 181
 182         // Obtain the expected frame numer
 183         mlt_position expected = mlt_properties_get_position( properties, "audio_expected" );
 184
 185         // Get the fps for this producer
 186         double fps = mlt_properties_get_double( properties, "fps" );
 187
 188         // Get the vorbis info
 189         vorbis_info *vi = ov_info( ov, -1 );
 190
 191         // Obtain the audio buffer
 192         int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
 193
 194         // Get amount of audio used
 195         int audio_used =  mlt_properties_get_int( properties, "audio_used" );
 196
 197         // Number of frames to ignore (for ffwd)
 198         int ignore = 0;
 199
 200         // Flag for paused (silence)
 201         int paused = 0;
 202
 203         // Check for audio buffer and create if necessary
 204         if ( audio_buffer == NULL )
 205         {
 206                 // Release pointer
 207                 void *release = NULL;
 208
 209                 // Allocate the audio buffer
 210                 audio_buffer = mlt_pool_allocate( 131072 * sizeof( int16_t ), &release );
 211
 212                 // And store it on properties for reuse
 213                 mlt_properties_set_data( properties, "audio_buffer_release", release, 0, ( mlt_destructor )mlt_pool_release, NULL );
 214                 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, NULL, NULL );
 215         }
 216
 217         // Seek if necessary
 218         if ( position != expected )
 219         {
 220                 if ( position + 1 == expected )
 221                 {
 222                         // We're paused - silence required
 223                         paused = 1;
 224                 }
 225                 else if ( position > expected && ( position - expected ) < 250 )
 226                 {
 227                         // Fast forward - seeking is inefficient for small distances - just ignore following frames
 228                         ignore = position - expected;
 229                 }
 230                 else
 231                 {
 232                         // Seek to the required position
 233                         ov_time_seek( ov, producer_time_of_frame( this, position ) );
 234                         expected = position;
 235                         audio_used = 0;
 236                 }
 237         }
 238
 239         // Return info in frame
 240         *frequency = vi->rate;
 241         *channels = vi->channels;
 242
 243         // Get the audio if required
 244         if ( !paused )
 245         {
 246                 // Bitstream section
 247                 int current_section;
 248
 249                 // Get the number of samples for the current frame
 250                 *samples = mlt_sample_calculator( fps, *frequency, expected ++ );
 251
 252                 while( *samples > audio_used  )
 253                 {
 254                         // Read the samples
 255                         int bytes = ov_read( ov, ( char * )( &audio_buffer[ audio_used * 2 ] ), 4096, 0, 2, 1, &current_section );
 256
 257                         // Break if error or eof
 258                         if ( bytes <= 0 )
 259                                 break;
 260
 261                         // Increment number of samples used
 262                         audio_used += bytes / ( sizeof( int16_t ) * *channels );
 263
 264                         // Handle ignore
 265                         while ( ignore && audio_used >= *samples )
 266                         {
 267                                 ignore --;
 268                                 audio_used -= *samples;
 269                                 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
 270                                 *samples = mlt_sample_calculator( fps, *frequency, expected ++ );
 271                         }
 272                 }
 273
 274                 // Now handle the audio if we have enough
 275                 if ( audio_used >= *samples )
 276                 {
 277                         void *release = NULL;
 278                         *buffer = mlt_pool_allocate( *samples * *channels * sizeof( int16_t ), &release );
 279                         memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
 280                         audio_used -= *samples;
 281                         memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
 282                         mlt_properties_set_data( frame_properties, "audio_release", release, 0, ( mlt_destructor )mlt_pool_release, NULL );
 283                         mlt_properties_set_data( frame_properties, "audio", *buffer, 0, NULL, NULL );
 284                 }
 285                 else
 286                 {
 287                         frame->get_audio = NULL;
 288                         mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
 289                         audio_used = 0;
 290                 }
 291
 292                 // Store the number of audio samples still available
 293                 mlt_properties_set_int( properties, "audio_used", audio_used );
 294         }
 295         else
 296         {
 297                 // Get silence and don't touch the context
 298                 frame->get_audio = NULL;
 299                 *samples = mlt_sample_calculator( fps, *frequency, position );
 300                 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
 301         }
 302
 303         // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
 304         mlt_properties_set_position( properties, "audio_expected", position + 1 );
 305
 306         return 0;
 307 }
 308
 309 /** Set up audio handling.
 310 */
 311
 312 static void producer_set_up_audio( mlt_producer this, mlt_frame frame )
 313 {
 314         // Get the properties
 315         mlt_properties properties = mlt_frame_properties( frame );
 316
 317         // Set the audio method
 318         frame->get_audio = producer_get_audio;
 319
 320         // Set the producer on the frame
 321         mlt_properties_set_data( properties, "vorbis_producer", this, 0, NULL, NULL );
 322 }
 323
 324 /** Our get frame implementation.
 325 */
 326
 327 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
 328 {
 329         // Create an empty frame
 330         *frame = mlt_frame_init( );
 331
 332         // Update timecode on the frame we're creating
 333         mlt_frame_set_position( *frame, mlt_producer_position( this ) );
 334
 335         // Set the position of this producer
 336         mlt_properties_set_position( mlt_frame_properties( *frame ), "vorbis_position", mlt_producer_get_in( this ) + mlt_producer_position( this ) );
 337
 338         // Set up the audio
 339         producer_set_up_audio( this, *frame );
 340
 341         // Calculate the next timecode
 342         mlt_producer_prepare_next( this );
 343
 344         return 0;
 345 }