1 /*****************************************************************************
2 * mixer.c : audio output mixing operations
3 *****************************************************************************
4 * Copyright (C) 2002-2004 the VideoLAN team
7 * Authors: Christophe Massiot <massiot@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
33 #include <vlc_common.h>
40 #include "aout_internal.h"
41 /*****************************************************************************
42 * aout_MixerNew: prepare a mixer plug-in
43 *****************************************************************************
44 * Please note that you must hold the mixer lock.
45 *****************************************************************************/
46 int aout_MixerNew( aout_instance_t * p_aout )
48 assert( !p_aout->p_mixer );
49 vlc_assert_locked( &p_aout->input_fifos_lock );
51 aout_mixer_t *p_mixer = vlc_object_create( p_aout, sizeof(*p_mixer) );
55 p_mixer->fmt = p_aout->mixer_format;
56 p_mixer->allocation = p_aout->mixer_allocation;
57 p_mixer->multiplier = p_aout->mixer_multiplier;
58 p_mixer->input_count = p_aout->i_nb_inputs;
59 p_mixer->input = calloc( p_mixer->input_count, sizeof(*p_mixer->input) );
60 for( int i = 0; i < p_aout->i_nb_inputs; i++ )
61 p_mixer->input[i] = &p_aout->pp_inputs[i]->mixer;
65 vlc_object_attach( p_mixer, p_aout );
67 p_mixer->module = module_need( p_mixer, "audio mixer", NULL, false );
68 if( !p_mixer->module )
70 msg_Err( p_aout, "no suitable audio mixer" );
71 vlc_object_detach( p_mixer );
72 free( p_mixer->input );
73 vlc_object_release( p_mixer );
78 p_aout->p_mixer = p_mixer;
82 /*****************************************************************************
83 * aout_MixerDelete: delete the mixer
84 *****************************************************************************
85 * Please note that you must hold the mixer lock.
86 *****************************************************************************/
87 void aout_MixerDelete( aout_instance_t * p_aout )
89 if( !p_aout->p_mixer )
92 vlc_object_detach( p_aout->p_mixer );
94 module_unneed( p_aout->p_mixer, p_aout->p_mixer->module );
96 vlc_object_release( p_aout->p_mixer );
99 p_aout->p_mixer = NULL;
102 /*****************************************************************************
103 * MixBuffer: try to prepare one output buffer
104 *****************************************************************************
105 * Please note that you must hold the mixer lock.
106 *****************************************************************************/
107 static int MixBuffer( aout_instance_t * p_aout )
109 int i, i_first_input = 0;
110 aout_buffer_t * p_output_buffer;
111 mtime_t start_date, end_date;
112 date_t exact_start_date;
114 if( !p_aout->p_mixer )
116 /* Free all incoming buffers. */
117 aout_lock_input_fifos( p_aout );
118 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
120 aout_input_t * p_input = p_aout->pp_inputs[i];
121 aout_buffer_t * p_buffer = p_input->mixer.fifo.p_first;
122 if ( p_input->b_error ) continue;
123 while ( p_buffer != NULL )
125 aout_buffer_t * p_next = p_buffer->p_next;
126 aout_BufferFree( p_buffer );
130 aout_unlock_input_fifos( p_aout );
135 aout_lock_output_fifo( p_aout );
136 aout_lock_input_fifos( p_aout );
138 /* Retrieve the date of the next buffer. */
139 exact_start_date = p_aout->output.fifo.end_date;
140 start_date = date_Get( &exact_start_date );
142 if ( start_date != 0 && start_date < mdate() )
144 /* The output is _very_ late. This can only happen if the user
145 * pauses the stream (or if the decoder is buggy, which cannot
147 msg_Warn( p_aout, "output PTS is out of range (%"PRId64"), clearing out",
148 mdate() - start_date );
149 aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
150 date_Set( &exact_start_date, 0 );
154 aout_unlock_output_fifo( p_aout );
156 /* See if we have enough data to prepare a new buffer for the audio
157 * output. First : start date. */
160 /* Find the latest start date available. */
161 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
163 aout_input_t * p_input = p_aout->pp_inputs[i];
164 aout_fifo_t * p_fifo = &p_input->mixer.fifo;
165 aout_buffer_t * p_buffer;
167 if ( p_input->b_error || p_input->b_paused )
170 p_buffer = p_fifo->p_first;
171 while ( p_buffer != NULL && p_buffer->start_date < mdate() )
173 msg_Warn( p_aout, "input PTS is out of range (%"PRId64"), "
174 "trashing", mdate() - p_buffer->start_date );
175 p_buffer = aout_FifoPop( p_aout, p_fifo );
176 aout_BufferFree( p_buffer );
177 p_buffer = p_fifo->p_first;
178 p_input->mixer.begin = NULL;
181 if ( p_buffer == NULL )
186 if ( !start_date || start_date < p_buffer->start_date )
188 date_Set( &exact_start_date, p_buffer->start_date );
189 start_date = p_buffer->start_date;
193 if ( i < p_aout->i_nb_inputs )
195 /* Interrupted before the end... We can't run. */
196 aout_unlock_input_fifos( p_aout );
200 date_Increment( &exact_start_date, p_aout->output.i_nb_samples );
201 end_date = date_Get( &exact_start_date );
203 /* Check that start_date and end_date are available for all input
205 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
207 aout_input_t * p_input = p_aout->pp_inputs[i];
208 aout_fifo_t * p_fifo = &p_input->mixer.fifo;
209 aout_buffer_t * p_buffer;
213 p_input->mixer.is_invalid = p_input->b_error || p_input->b_paused;
214 if ( p_input->mixer.is_invalid )
216 if ( i_first_input == i ) i_first_input++;
220 p_buffer = p_fifo->p_first;
221 if ( p_buffer == NULL )
226 /* Check for the continuity of start_date */
227 while ( p_buffer != NULL && p_buffer->end_date < start_date - 1 )
229 /* We authorize a +-1 because rounding errors get compensated
231 aout_buffer_t * p_next = p_buffer->p_next;
232 msg_Warn( p_aout, "the mixer got a packet in the past (%"PRId64")",
233 start_date - p_buffer->end_date );
234 aout_BufferFree( p_buffer );
235 p_fifo->p_first = p_buffer = p_next;
236 p_input->mixer.begin = NULL;
238 if ( p_buffer == NULL )
240 p_fifo->pp_last = &p_fifo->p_first;
244 /* Check that we have enough samples. */
247 p_buffer = p_fifo->p_first;
248 if ( p_buffer == NULL ) break;
249 if ( p_buffer->end_date >= end_date ) break;
251 /* Check that all buffers are contiguous. */
252 prev_date = p_fifo->p_first->end_date;
253 p_buffer = p_buffer->p_next;
255 for ( ; p_buffer != NULL; p_buffer = p_buffer->p_next )
257 if ( prev_date != p_buffer->start_date )
260 "buffer hole, dropping packets (%"PRId64")",
261 p_buffer->start_date - prev_date );
265 if ( p_buffer->end_date >= end_date ) break;
266 prev_date = p_buffer->end_date;
268 if ( b_drop_buffers )
270 aout_buffer_t * p_deleted = p_fifo->p_first;
271 while ( p_deleted != NULL && p_deleted != p_buffer )
273 aout_buffer_t * p_next = p_deleted->p_next;
274 aout_BufferFree( p_deleted );
277 p_fifo->p_first = p_deleted; /* == p_buffer */
281 if ( p_buffer == NULL ) break;
283 p_buffer = p_fifo->p_first;
284 if ( !AOUT_FMT_NON_LINEAR( &p_aout->p_mixer->fmt ) )
286 /* Additionally check that p_first_byte_to_mix is well
288 mtime_t i_nb_bytes = (start_date - p_buffer->start_date)
289 * p_aout->p_mixer->fmt.i_bytes_per_frame
290 * p_aout->p_mixer->fmt.i_rate
291 / p_aout->p_mixer->fmt.i_frame_length
293 ptrdiff_t mixer_nb_bytes;
295 if ( p_input->mixer.begin == NULL )
297 p_input->mixer.begin = p_buffer->p_buffer;
299 mixer_nb_bytes = p_input->mixer.begin - p_buffer->p_buffer;
301 if ( !((i_nb_bytes + p_aout->p_mixer->fmt.i_bytes_per_frame
303 (i_nb_bytes < p_aout->p_mixer->fmt.i_bytes_per_frame
306 msg_Warn( p_aout, "mixer start isn't output start (%"PRId64")",
307 i_nb_bytes - mixer_nb_bytes );
309 /* Round to the nearest multiple */
310 i_nb_bytes /= p_aout->p_mixer->fmt.i_bytes_per_frame;
311 i_nb_bytes *= p_aout->p_mixer->fmt.i_bytes_per_frame;
314 /* Is it really the best way to do it ? */
315 aout_lock_output_fifo( p_aout );
316 aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
317 date_Set( &exact_start_date, 0 );
318 aout_unlock_output_fifo( p_aout );
322 p_input->mixer.begin = p_buffer->p_buffer + i_nb_bytes;
327 if ( i < p_aout->i_nb_inputs || i_first_input == p_aout->i_nb_inputs )
329 /* Interrupted before the end... We can't run. */
330 aout_unlock_input_fifos( p_aout );
335 aout_BufferAlloc( &p_aout->p_mixer->allocation,
336 ((uint64_t)p_aout->output.i_nb_samples * 1000000)
337 / p_aout->output.output.i_rate,
338 /* This is a bit kludgy, but is actually only used
339 * for the S/PDIF dummy mixer : */
340 p_aout->pp_inputs[i_first_input]->mixer.fifo.p_first,
342 if ( p_output_buffer == NULL )
344 aout_unlock_input_fifos( p_aout );
347 /* This is again a bit kludgy - for the S/PDIF mixer. */
348 if ( p_aout->p_mixer->allocation.i_alloc_type != AOUT_ALLOC_NONE )
350 p_output_buffer->i_nb_samples = p_aout->output.i_nb_samples;
351 p_output_buffer->i_nb_bytes = p_aout->output.i_nb_samples
352 * p_aout->p_mixer->fmt.i_bytes_per_frame
353 / p_aout->p_mixer->fmt.i_frame_length;
355 p_output_buffer->start_date = start_date;
356 p_output_buffer->end_date = end_date;
358 p_aout->p_mixer->mix( p_aout->p_mixer, p_output_buffer );
360 aout_unlock_input_fifos( p_aout );
362 aout_OutputPlay( p_aout, p_output_buffer );
367 /*****************************************************************************
368 * aout_MixerRun: entry point for the mixer & post-filters processing
369 *****************************************************************************
370 * Please note that you must hold the mixer lock.
371 *****************************************************************************/
372 void aout_MixerRun( aout_instance_t * p_aout )
374 while( MixBuffer( p_aout ) != -1 );
377 /*****************************************************************************
378 * aout_MixerMultiplierSet: set p_aout->mixer.f_multiplier
379 *****************************************************************************
380 * Please note that we assume that you own the mixer lock when entering this
381 * function. This function returns -1 on error.
382 *****************************************************************************/
383 int aout_MixerMultiplierSet( aout_instance_t * p_aout, float f_multiplier )
385 float f_old = p_aout->mixer_multiplier;
386 bool b_new_mixer = false;
388 if ( p_aout->p_mixer )
390 aout_MixerDelete( p_aout );
394 p_aout->mixer_multiplier = f_multiplier;
396 if ( b_new_mixer && aout_MixerNew( p_aout ) )
398 p_aout->mixer_multiplier = f_old;
399 aout_MixerNew( p_aout );
406 /*****************************************************************************
407 * aout_MixerMultiplierGet: get p_aout->mixer.f_multiplier
408 *****************************************************************************
409 * Please note that we assume that you own the mixer lock when entering this
410 * function. This function returns -1 on error.
411 *****************************************************************************/
412 int aout_MixerMultiplierGet( aout_instance_t * p_aout, float * pf_multiplier )
414 *pf_multiplier = p_aout->mixer_multiplier;