2 * producer_vorbis.c -- vorbis producer
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
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.
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.
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.
22 #include "producer_vorbis.h"
25 #include <framework/mlt_frame.h>
27 // vorbis Header files
28 #include <vorbis/codec.h>
29 #include <vorbis/vorbisfile.h>
31 // System header files
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
);
39 /** Constructor for libvorbis.
42 mlt_producer
producer_vorbis_init( char *file
)
44 mlt_producer
this = NULL
;
46 // Check that we have a non-NULL argument
49 // Construct the producer
50 this = calloc( 1, sizeof( struct mlt_producer_s
) );
53 if ( mlt_producer_init( this, NULL
) == 0 )
56 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
58 // Set the resource property (required for all producers)
59 mlt_properties_set( properties
, "resource", file
);
61 // Register our get_frame implementation
62 this->get_frame
= producer_get_frame
;
65 if ( producer_open( this, file
) != 0 )
68 mlt_producer_close( this );
77 /** Destuctor for ogg files.
80 static void producer_file_close( void *file
)
84 // Close the ogg vorbis structure
95 static int producer_open( mlt_producer
this, char *file
)
97 // FILE pointer for file
98 FILE *input
= fopen( file
, "r" );
100 // Error code to return
101 int error
= input
== NULL
;
103 // Continue if file is open
106 // OggVorbis file structure
107 OggVorbis_File
*ov
= calloc( 1, sizeof( OggVorbis_File
) );
109 // Attempt to open the stream
110 error
= ov
== NULL
|| ov_open( input
, ov
, NULL
, 0 ) != 0;
112 // Assign to producer properties if successful
115 // Get the properties
116 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
118 // Assign the ov structure
119 mlt_properties_set_data( properties
, "ogg_vorbis_file", ov
, 0, producer_file_close
, NULL
);
121 if ( ov_seekable( ov
) )
123 // Get the length of the file
124 double length
= ov_time_total( ov
, -1 );
126 // We will treat everything with the producer fps
127 double fps
= mlt_properties_get_double( properties
, "fps" );
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
) );
133 // Get the vorbis info
134 vorbis_info
*vi
= ov_info( ov
, -1 );
135 mlt_properties_set_int( properties
, "frequency", (int) vi
->rate
);
136 mlt_properties_set_int( properties
, "channels", vi
->channels
);
144 // Must close input file when open fails
152 /** Convert a frame position to a time code.
155 static double producer_time_of_frame( mlt_producer
this, mlt_position position
)
157 // Get the properties
158 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
161 double fps
= mlt_properties_get_double( properties
, "fps" );
164 return ( double )position
/ fps
;
167 /** Get the audio from a frame.
170 static int producer_get_audio( mlt_frame frame
, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
172 // Get the properties from the frame
173 mlt_properties frame_properties
= MLT_FRAME_PROPERTIES( frame
);
175 // Obtain the frame number of this frame
176 mlt_position position
= mlt_properties_get_position( frame_properties
, "vorbis_position" );
179 mlt_producer
this = mlt_frame_pop_audio( frame
);
181 // Get the producer properties
182 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
184 // Get the ogg vorbis file
185 OggVorbis_File
*ov
= mlt_properties_get_data( properties
, "ogg_vorbis_file", NULL
);
187 // Obtain the expected frame numer
188 mlt_position expected
= mlt_properties_get_position( properties
, "audio_expected" );
190 // Get the fps for this producer
191 double fps
= mlt_properties_get_double( properties
, "fps" );
193 // Get the vorbis info
194 vorbis_info
*vi
= ov_info( ov
, -1 );
196 // Obtain the audio buffer
197 int16_t *audio_buffer
= mlt_properties_get_data( properties
, "audio_buffer", NULL
);
199 // Get amount of audio used
200 int audio_used
= mlt_properties_get_int( properties
, "audio_used" );
202 // Number of frames to ignore (for ffwd)
205 // Flag for paused (silence)
208 // Check for audio buffer and create if necessary
209 if ( audio_buffer
== NULL
)
211 // Allocate the audio buffer
212 audio_buffer
= mlt_pool_alloc( 131072 * sizeof( int16_t ) );
214 // And store it on properties for reuse
215 mlt_properties_set_data( properties
, "audio_buffer", audio_buffer
, 0, mlt_pool_release
, NULL
);
219 if ( position
!= expected
)
221 if ( position
+ 1 == expected
)
223 // We're paused - silence required
226 else if ( position
> expected
&& ( position
- expected
) < 250 )
228 // Fast forward - seeking is inefficient for small distances - just ignore following frames
229 ignore
= position
- expected
;
233 // Seek to the required position
234 ov_time_seek( ov
, producer_time_of_frame( this, position
) );
240 // Return info in frame
241 *frequency
= vi
->rate
;
242 *channels
= vi
->channels
;
244 // Get the audio if required
250 // Get the number of samples for the current frame
251 *samples
= mlt_sample_calculator( fps
, *frequency
, expected
++ );
253 while( *samples
> audio_used
)
256 int bytes
= ov_read( ov
, ( char * )( &audio_buffer
[ audio_used
* 2 ] ), 4096, 0, 2, 1, ¤t_section
);
258 // Break if error or eof
262 // Increment number of samples used
263 audio_used
+= bytes
/ ( sizeof( int16_t ) * *channels
);
266 while ( ignore
&& audio_used
>= *samples
)
269 audio_used
-= *samples
;
270 memmove( audio_buffer
, &audio_buffer
[ *samples
* *channels
], audio_used
* sizeof( int16_t ) );
271 *samples
= mlt_sample_calculator( fps
, *frequency
, expected
++ );
275 // Now handle the audio if we have enough
276 if ( audio_used
>= *samples
)
278 *buffer
= mlt_pool_alloc( *samples
* *channels
* sizeof( int16_t ) );
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", *buffer
, 0, mlt_pool_release
, NULL
);
286 mlt_frame_get_audio( frame
, buffer
, format
, frequency
, channels
, samples
);
290 // Store the number of audio samples still available
291 mlt_properties_set_int( properties
, "audio_used", audio_used
);
295 // Get silence and don't touch the context
296 *samples
= mlt_sample_calculator( fps
, *frequency
, position
);
297 mlt_frame_get_audio( frame
, buffer
, format
, frequency
, channels
, samples
);
300 // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
301 mlt_properties_set_position( properties
, "audio_expected", position
+ 1 );
306 /** Our get frame implementation.
309 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int index
)
311 // Create an empty frame
312 *frame
= mlt_frame_init( );
314 // Update timecode on the frame we're creating
315 mlt_frame_set_position( *frame
, mlt_producer_position( this ) );
317 // Set the position of this producer
318 mlt_properties frame_properties
= MLT_FRAME_PROPERTIES( *frame
);
319 mlt_properties_set_position( frame_properties
, "vorbis_position", mlt_producer_frame( this ) );
322 mlt_frame_push_audio( *frame
, this );
323 mlt_frame_push_audio( *frame
, producer_get_audio
);
325 // Pass audio properties to the frame
326 mlt_properties_pass_list( frame_properties
, MLT_PRODUCER_PROPERTIES( this ), "frequency, channels" );
328 // Calculate the next timecode
329 mlt_producer_prepare_next( this );