2 * filter_sox.c -- apply any number of SOX effects using libst
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Dan Dennedy <dan@dennedy.org>
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
21 #include <framework/mlt_filter.h>
22 #include <framework/mlt_frame.h>
23 #include <framework/mlt_tokeniser.h>
30 // TODO: does not support multiple effects with SoX v14.1.0+
34 # define ST_EOF SOX_EOF
35 # define ST_SUCCESS SOX_SUCCESS
36 # define st_sample_t sox_sample_t
37 # define eff_t sox_effect_t*
38 # define st_size_t sox_size_t
39 # define ST_LIB_VERSION_CODE SOX_LIB_VERSION_CODE
40 # define ST_LIB_VERSION SOX_LIB_VERSION
41 # define ST_SIGNED_WORD_TO_SAMPLE(d,clips) SOX_SIGNED_16BIT_TO_SAMPLE(d,clips)
42 #if (ST_LIB_VERSION_CODE >= ST_LIB_VERSION(14,1,0))
43 # define ST_SSIZE_MIN SOX_SAMPLE_MIN
45 # define ST_SSIZE_MIN SOX_SSIZE_MIN
47 # define ST_SAMPLE_TO_SIGNED_WORD(d,clips) SOX_SAMPLE_TO_SIGNED_16BIT(d,clips)
52 #define BUFFER_LEN 8192
53 #define AMPLITUDE_NORM 0.2511886431509580 /* -12dBFS */
54 #define AMPLITUDE_MIN 0.00001
56 /** Compute the mean of a set of doubles skipping unset values flagged as -1
58 static inline double mean( double *buf
, int count
)
64 for ( i
= 0; i
< count
; i
++ )
66 if ( buf
[ i
] != -1.0 )
78 static void delete_effect( eff_t effp
)
81 free( (void*)effp
->in_encoding
);
85 /** Create an effect state instance for a channels
87 static int create_effect( mlt_filter
this, char *value
, int count
, int channel
, int frequency
)
89 mlt_tokeniser tokeniser
= mlt_tokeniser_init();
93 // Tokenise the effect specification
94 mlt_tokeniser_parse_new( tokeniser
, value
, " " );
95 if ( tokeniser
->count
< 1 )
99 mlt_destructor effect_destructor
= mlt_pool_release
;
101 //fprintf(stderr, "%s: effect %s count %d\n", __FUNCTION__, tokeniser->tokens[0], tokeniser->count );
102 #if (ST_LIB_VERSION_CODE >= ST_LIB_VERSION(14,1,0))
103 eff_t eff
= sox_create_effect( sox_find_effect( tokeniser
->tokens
[0] ) );
104 effect_destructor
= ( mlt_destructor
) delete_effect
;
105 sox_encodinginfo_t
*enc
= calloc( 1, sizeof( sox_encodinginfo_t
) );
106 enc
->encoding
= SOX_ENCODING_SIGN2
;
107 enc
->bits_per_sample
= 16;
108 eff
->in_encoding
= eff
->out_encoding
= enc
;
110 eff_t eff
= mlt_pool_alloc( sizeof( sox_effect_t
) );
111 sox_create_effect( eff
, sox_find_effect( tokeniser
->tokens
[0] ) );
113 int opt_count
= tokeniser
->count
- 1;
115 eff_t eff
= mlt_pool_alloc( sizeof( struct st_effect
) );
116 int opt_count
= st_geteffect_opt( eff
, tokeniser
->count
, tokeniser
->tokens
);
120 if ( opt_count
!= ST_EOF
)
122 // Supply the effect parameters
124 if ( ( * eff
->handler
.getopts
)( eff
, opt_count
, &tokeniser
->tokens
[ tokeniser
->count
> 1 ?
1 : 0 ] ) == ST_SUCCESS
)
126 if ( ( * eff
->h
->getopts
)( eff
, opt_count
, &tokeniser
->tokens
[ tokeniser
->count
- opt_count
] ) == ST_SUCCESS
)
129 // Set the sox signal parameters
130 #if (ST_LIB_VERSION_CODE >= ST_LIB_VERSION(14,1,0))
131 eff
->in_signal
.rate
= frequency
;
132 eff
->out_signal
.rate
= frequency
;
133 eff
->in_signal
.channels
= 1;
134 eff
->out_signal
.channels
= 1;
135 eff
->in_signal
.precision
= 16;
136 eff
->out_signal
.precision
= 16;
137 eff
->in_signal
.length
= 0;
138 eff
->out_signal
.length
= 0;
140 eff
->ininfo
.rate
= frequency
;
141 eff
->outinfo
.rate
= frequency
;
142 eff
->ininfo
.channels
= 1;
143 eff
->outinfo
.channels
= 1;
148 if ( ( * eff
->handler
.start
)( eff
) == ST_SUCCESS
)
150 if ( ( * eff
->h
->start
)( eff
) == ST_SUCCESS
)
154 sprintf( id
, "_effect_%d_%d", count
, channel
);
156 // Save the effect state
157 mlt_properties_set_data( MLT_FILTER_PROPERTIES( this ), id
, eff
, 0, effect_destructor
, NULL
);
162 // Some error occurred so delete the temp effect state
164 effect_destructor( eff
);
166 mlt_tokeniser_close( tokeniser
);
174 static int filter_get_audio( mlt_frame frame
, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
176 // Get the properties of the frame
177 mlt_properties properties
= MLT_FRAME_PROPERTIES( frame
);
179 // Get the filter service
180 mlt_filter filter
= mlt_frame_pop_audio( frame
);
182 // Get the filter properties
183 mlt_properties filter_properties
= MLT_FILTER_PROPERTIES( filter
);
185 // Get the properties
186 st_sample_t
*input_buffer
= mlt_properties_get_data( filter_properties
, "input_buffer", NULL
);
187 st_sample_t
*output_buffer
= mlt_properties_get_data( filter_properties
, "output_buffer", NULL
);
188 int channels_avail
= *channels
;
190 int count
= mlt_properties_get_int( filter_properties
, "_effect_count" );
192 // Get the producer's audio
193 mlt_frame_get_audio( frame
, buffer
, format
, frequency
, &channels_avail
, samples
);
195 // Duplicate channels as necessary
196 if ( channels_avail
< *channels
)
198 int size
= *channels
* *samples
* sizeof( int16_t );
199 int16_t *new_buffer
= mlt_pool_alloc( size
);
202 // Duplicate the existing channels
203 for ( i
= 0; i
< *samples
; i
++ )
205 for ( j
= 0; j
< *channels
; j
++ )
207 new_buffer
[ ( i
* *channels
) + j
] = (*buffer
)[ ( i
* channels_avail
) + k
];
208 k
= ( k
+ 1 ) % channels_avail
;
212 // Update the audio buffer now - destroys the old
213 mlt_properties_set_data( properties
, "audio", new_buffer
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
215 *buffer
= new_buffer
;
217 else if ( channels_avail
== 6 && *channels
== 2 )
219 // Nasty hack for ac3 5.1 audio - may be a cause of failure?
220 int size
= *channels
* *samples
* sizeof( int16_t );
221 int16_t *new_buffer
= mlt_pool_alloc( size
);
223 // Drop all but the first *channels
224 for ( i
= 0; i
< *samples
; i
++ )
226 new_buffer
[ ( i
* *channels
) + 0 ] = (*buffer
)[ ( i
* channels_avail
) + 2 ];
227 new_buffer
[ ( i
* *channels
) + 1 ] = (*buffer
)[ ( i
* channels_avail
) + 3 ];
230 // Update the audio buffer now - destroys the old
231 mlt_properties_set_data( properties
, "audio", new_buffer
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
233 *buffer
= new_buffer
;
236 // Even though some effects are multi-channel aware, it is not reliable
237 // We must maintain a separate effect state for each channel
238 for ( i
= 0; i
< *channels
; i
++ )
241 sprintf( id
, "_effect_0_%d", i
);
243 // Get an existing effect state
244 eff_t e
= mlt_properties_get_data( filter_properties
, id
, NULL
);
246 // Validate the existing effect state
247 #if (ST_LIB_VERSION_CODE >= ST_LIB_VERSION(14,1,0))
248 if ( e
!= NULL
&& ( e
->in_signal
.rate
!= *frequency
||
249 e
->out_signal
.rate
!= *frequency
) )
251 if ( e
!= NULL
&& ( e
->ininfo
.rate
!= *frequency
||
252 e
->outinfo
.rate
!= *frequency
) )
256 // (Re)Create the effect state
264 // Loop over all properties
265 for ( j
= 0; j
< mlt_properties_count( filter_properties
); j
++ )
267 // Get the name of this property
268 char *name
= mlt_properties_get_name( filter_properties
, j
);
270 // If the name does not contain a . and matches effect
271 if ( !strncmp( name
, "effect", 6 ) )
273 // Get the effect specification
274 char *value
= mlt_properties_get( filter_properties
, name
);
276 // Create an instance
277 if ( create_effect( filter
, value
, count
, i
, *frequency
) == 0 )
282 // Save the number of filters
283 mlt_properties_set_int( filter_properties
, "_effect_count", count
);
286 if ( *samples
> 0 && count
> 0 )
288 st_sample_t
*p
= input_buffer
;
289 st_sample_t
*end
= p
+ *samples
;
290 int16_t *q
= *buffer
+ i
;
291 st_size_t isamp
= *samples
;
292 st_size_t osamp
= *samples
;
295 char *normalise
= mlt_properties_get( filter_properties
, "normalise" );
296 double normalised_gain
= 1.0;
297 #if (ST_LIB_VERSION_CODE >= ST_LIB_VERSION(13,0,0))
298 st_sample_t dummy_clipped_count
= 0;
301 // Convert to sox encoding
304 #if (ST_LIB_VERSION_CODE >= ST_LIB_VERSION(13,0,0))
305 *p
= ST_SIGNED_WORD_TO_SAMPLE( *q
, dummy_clipped_count
);
307 *p
= ST_SIGNED_WORD_TO_SAMPLE( *q
);
309 // Compute rms amplitude while we are accessing each sample
310 rms
+= ( double )*p
* ( double )*p
;
316 // Compute final rms amplitude
317 rms
= sqrt( rms
/ *samples
/ ST_SSIZE_MIN
/ ST_SSIZE_MIN
);
321 int window
= mlt_properties_get_int( filter_properties
, "window" );
322 double *smooth_buffer
= mlt_properties_get_data( filter_properties
, "smooth_buffer", NULL
);
323 double max_gain
= mlt_properties_get_double( filter_properties
, "max_gain" );
325 // Default the maximum gain factor to 20dBFS
329 // The smoothing buffer prevents radical shifts in the gain level
330 if ( window
> 0 && smooth_buffer
!= NULL
)
332 int smooth_index
= mlt_properties_get_int( filter_properties
, "_smooth_index" );
333 smooth_buffer
[ smooth_index
] = rms
;
335 // Ignore very small values that adversely affect the mean
336 if ( rms
> AMPLITUDE_MIN
)
337 mlt_properties_set_int( filter_properties
, "_smooth_index", ( smooth_index
+ 1 ) % window
);
339 // Smoothing is really just a mean over the past N values
340 normalised_gain
= AMPLITUDE_NORM
/ mean( smooth_buffer
, window
);
344 // Determine gain to apply as current amplitude
345 normalised_gain
= AMPLITUDE_NORM
/ rms
;
348 //printf("filter_sox: rms %.3f gain %.3f\n", rms, normalised_gain );
350 // Govern the maximum gain
351 if ( normalised_gain
> max_gain
)
352 normalised_gain
= max_gain
;
356 for ( j
= 0; j
< count
; j
++ )
358 sprintf( id
, "_effect_%d_%d", j
, i
);
359 e
= mlt_properties_get_data( filter_properties
, id
, NULL
);
361 // We better have this guy
364 float saved_gain
= 1.0;
366 // XXX: hack to apply the normalised gain level to the vol effect
368 if ( normalise
&& strcmp( e
->handler
.name
, "vol" ) == 0 )
370 if ( normalise
&& strcmp( e
->name
, "vol" ) == 0 )
373 float *f
= ( float * )( e
->priv
);
375 *f
= saved_gain
* normalised_gain
;
380 if ( ( * e
->handler
.flow
)( e
, input_buffer
, output_buffer
, &isamp
, &osamp
) == ST_SUCCESS
)
382 if ( ( * e
->h
->flow
)( e
, input_buffer
, output_buffer
, &isamp
, &osamp
) == ST_SUCCESS
)
385 // Swap input and output buffer pointers for subsequent effects
387 input_buffer
= output_buffer
;
391 // XXX: hack to restore the original vol gain to prevent accumulation
393 if ( normalise
&& strcmp( e
->handler
.name
, "vol" ) == 0 )
395 if ( normalise
&& strcmp( e
->name
, "vol" ) == 0 )
398 float *f
= ( float * )( e
->priv
);
404 // Convert back to signed 16bit
410 #if (ST_LIB_VERSION_CODE >= ST_LIB_VERSION(13,0,0))
411 *q
= ST_SAMPLE_TO_SIGNED_WORD( *p
++, dummy_clipped_count
);
413 *q
= ST_SAMPLE_TO_SIGNED_WORD( *p
++ );
423 /** Filter processing.
426 static mlt_frame
filter_process( mlt_filter
this, mlt_frame frame
)
428 if ( mlt_frame_is_test_audio( frame
) == 0 )
430 // Add the filter to the frame
431 mlt_frame_push_audio( frame
, this );
432 mlt_frame_push_audio( frame
, filter_get_audio
);
434 // Parse the window property and allocate smoothing buffer if needed
435 mlt_properties properties
= MLT_FILTER_PROPERTIES( this );
436 int window
= mlt_properties_get_int( properties
, "window" );
437 if ( mlt_properties_get( properties
, "smooth_buffer" ) == NULL
&& window
> 1 )
439 // Create a smoothing buffer for the calculated "max power" of frame of audio used in normalisation
440 double *smooth_buffer
= (double*) calloc( window
, sizeof( double ) );
442 for ( i
= 0; i
< window
; i
++ )
443 smooth_buffer
[ i
] = -1.0;
444 mlt_properties_set_data( properties
, "smooth_buffer", smooth_buffer
, 0, free
, NULL
);
451 /** Constructor for the filter.
454 mlt_filter
filter_sox_init( mlt_profile profile
, mlt_service_type type
, const char *id
, char *arg
)
456 mlt_filter
this = mlt_filter_new( );
459 void *input_buffer
= mlt_pool_alloc( BUFFER_LEN
);
460 void *output_buffer
= mlt_pool_alloc( BUFFER_LEN
);
461 mlt_properties properties
= MLT_FILTER_PROPERTIES( this );
463 this->process
= filter_process
;
466 mlt_properties_set( properties
, "effect", arg
);
467 mlt_properties_set_data( properties
, "input_buffer", input_buffer
, BUFFER_LEN
, mlt_pool_release
, NULL
);
468 mlt_properties_set_data( properties
, "output_buffer", output_buffer
, BUFFER_LEN
, mlt_pool_release
, NULL
);
469 mlt_properties_set_int( properties
, "window", 75 );
474 // What to do when a libst internal failure occurs
477 // Is there a build problem with my sox-devel package?
479 void gsm_create(void){}
482 void gsm_decode(void){}
485 void gsm_encode(void){}
488 void gsm_destroy(void){}
491 void gsm_option(void){}