2 * producer_vorbis.c -- vorbis producer
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
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.
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.
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
22 #include <framework/mlt_producer.h>
23 #include <framework/mlt_frame.h>
25 // vorbis Header files
26 #include <vorbis/codec.h>
27 #include <vorbis/vorbisfile.h>
29 // System header files
34 // Forward references.
35 static int producer_open( mlt_producer this, char *file );
36 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
38 /** Structure for metadata reading
41 typedef struct _sw_metadata sw_metadata;
48 static sw_metadata *vorbis_metadata_from_str (char * str)
50 sw_metadata * meta = NULL;
53 for (i = 0; str[i]; i++) {
54 str[i] = tolower(str[i]);
57 meta = malloc (sizeof (sw_metadata));
58 meta->name = malloc( strlen(str) + 18 );
59 sprintf(meta->name, "meta.attr.%s.markup", str);
60 meta->content = strdup (&str[i+1]);
67 /** Constructor for libvorbis.
70 mlt_producer producer_vorbis_init( mlt_profile profile, mlt_service_type type, const char *id, char *file )
72 mlt_producer this = NULL;
74 // Check that we have a non-NULL argument
77 // Construct the producer
78 this = calloc( 1, sizeof( struct mlt_producer_s ) );
81 if ( mlt_producer_init( this, NULL ) == 0 )
84 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
86 // Set the resource property (required for all producers)
87 mlt_properties_set( properties, "resource", file );
89 // Register our get_frame implementation
90 this->get_frame = producer_get_frame;
93 if ( producer_open( this, file ) != 0 )
96 mlt_producer_close( this );
105 /** Destuctor for ogg files.
108 static void producer_file_close( void *file )
112 // Close the ogg vorbis structure
123 static int producer_open( mlt_producer this, char *file )
125 // FILE pointer for file
126 FILE *input = fopen( file, "r" );
128 // Error code to return
129 int error = input == NULL;
131 // Continue if file is open
134 // OggVorbis file structure
135 OggVorbis_File *ov = calloc( 1, sizeof( OggVorbis_File ) );
137 // Attempt to open the stream
138 error = ov == NULL || ov_open( input, ov, NULL, 0 ) != 0;
140 // Assign to producer properties if successful
143 // Get the properties
144 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
146 // Assign the ov structure
147 mlt_properties_set_data( properties, "ogg_vorbis_file", ov, 0, producer_file_close, NULL );
150 sw_metadata * metadata = NULL;
151 char **ptr = ov_comment(ov, -1)->user_comments;
153 metadata = vorbis_metadata_from_str (*ptr);
154 if (metadata != NULL)
155 mlt_properties_set(properties, metadata->name, metadata->content);
159 if ( ov_seekable( ov ) )
161 // Get the length of the file
162 double length = ov_time_total( ov, -1 );
164 // We will treat everything with the producer fps
165 double fps = mlt_producer_get_fps( this );
167 // Set out and length of file
168 mlt_properties_set_position( properties, "out", ( length * fps ) - 1 );
169 mlt_properties_set_position( properties, "length", ( length * fps ) );
171 // Get the vorbis info
172 vorbis_info *vi = ov_info( ov, -1 );
173 mlt_properties_set_int( properties, "frequency", (int) vi->rate );
174 mlt_properties_set_int( properties, "channels", vi->channels );
182 // Must close input file when open fails
190 /** Convert a frame position to a time code.
193 static double producer_time_of_frame( mlt_producer this, mlt_position position )
195 return ( double )position / mlt_producer_get_fps( this );
198 /** Get the audio from a frame.
201 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
203 // Get the properties from the frame
204 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
206 // Obtain the frame number of this frame
207 mlt_position position = mlt_properties_get_position( frame_properties, "vorbis_position" );
210 mlt_producer this = mlt_frame_pop_audio( frame );
212 // Get the producer properties
213 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
215 // Get the ogg vorbis file
216 OggVorbis_File *ov = mlt_properties_get_data( properties, "ogg_vorbis_file", NULL );
218 // Obtain the expected frame numer
219 mlt_position expected = mlt_properties_get_position( properties, "audio_expected" );
221 // Get the fps for this producer
222 double fps = mlt_producer_get_fps( this );
224 // Get the vorbis info
225 vorbis_info *vi = ov_info( ov, -1 );
227 // Obtain the audio buffer
228 int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
230 // Get amount of audio used
231 int audio_used = mlt_properties_get_int( properties, "audio_used" );
233 // Number of frames to ignore (for ffwd)
236 // Flag for paused (silence)
239 // Check for audio buffer and create if necessary
240 if ( audio_buffer == NULL )
242 // Allocate the audio buffer
243 audio_buffer = mlt_pool_alloc( 131072 * sizeof( int16_t ) );
245 // And store it on properties for reuse
246 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, mlt_pool_release, NULL );
250 if ( position != expected )
252 if ( position + 1 == expected )
254 // We're paused - silence required
257 else if ( position > expected && ( position - expected ) < 250 )
259 // Fast forward - seeking is inefficient for small distances - just ignore following frames
260 ignore = position - expected;
264 // Seek to the required position
265 ov_time_seek( ov, producer_time_of_frame( this, position ) );
271 // Return info in frame
272 *frequency = vi->rate;
273 *channels = vi->channels;
275 // Get the audio if required
281 // Get the number of samples for the current frame
282 *samples = mlt_sample_calculator( fps, *frequency, expected ++ );
284 while( *samples > audio_used )
287 int bytes = ov_read( ov, ( char * )( &audio_buffer[ audio_used * 2 ] ), 4096, 0, 2, 1, ¤t_section );
289 // Break if error or eof
293 // Increment number of samples used
294 audio_used += bytes / ( sizeof( int16_t ) * *channels );
297 while ( ignore && audio_used >= *samples )
300 audio_used -= *samples;
301 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
302 *samples = mlt_sample_calculator( fps, *frequency, expected ++ );
306 // Now handle the audio if we have enough
307 if ( audio_used >= *samples )
309 *buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
310 memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
311 audio_used -= *samples;
312 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
313 mlt_properties_set_data( frame_properties, "audio", *buffer, 0, mlt_pool_release, NULL );
317 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
321 // Store the number of audio samples still available
322 mlt_properties_set_int( properties, "audio_used", audio_used );
326 // Get silence and don't touch the context
327 *samples = mlt_sample_calculator( fps, *frequency, position );
328 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
331 // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
332 mlt_properties_set_position( properties, "audio_expected", position + 1 );
337 /** Our get frame implementation.
340 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
342 // Create an empty frame
343 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
345 // Update timecode on the frame we're creating
346 mlt_frame_set_position( *frame, mlt_producer_position( this ) );
348 // Set the position of this producer
349 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( *frame );
350 mlt_properties_set_position( frame_properties, "vorbis_position", mlt_producer_frame( this ) );
353 mlt_frame_push_audio( *frame, this );
354 mlt_frame_push_audio( *frame, producer_get_audio );
356 // Pass audio properties to the frame
357 mlt_properties_pass_list( frame_properties, MLT_PRODUCER_PROPERTIES( this ), "frequency, channels" );
359 // Calculate the next timecode
360 mlt_producer_prepare_next( this );