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 free( p_aout->p_mixer->input );
97 vlc_object_release( p_aout->p_mixer );
100 p_aout->p_mixer = NULL;
103 /*****************************************************************************
104 * MixBuffer: try to prepare one output buffer
105 *****************************************************************************
106 * Please note that you must hold the mixer lock.
107 *****************************************************************************/
108 static int MixBuffer( aout_instance_t * p_aout )
110 int i, i_first_input = 0;
111 aout_buffer_t * p_output_buffer;
112 mtime_t start_date, end_date;
113 date_t exact_start_date;
115 if( !p_aout->p_mixer )
117 /* Free all incoming buffers. */
118 aout_lock_input_fifos( p_aout );
119 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
121 aout_input_t * p_input = p_aout->pp_inputs[i];
122 aout_buffer_t * p_buffer = p_input->mixer.fifo.p_first;
123 if ( p_input->b_error ) continue;
124 while ( p_buffer != NULL )
126 aout_buffer_t * p_next = p_buffer->p_next;
127 aout_BufferFree( p_buffer );
131 aout_unlock_input_fifos( p_aout );
136 aout_lock_output_fifo( p_aout );
137 aout_lock_input_fifos( p_aout );
139 /* Retrieve the date of the next buffer. */
140 exact_start_date = p_aout->output.fifo.end_date;
141 start_date = date_Get( &exact_start_date );
143 if ( start_date != 0 && start_date < mdate() )
145 /* The output is _very_ late. This can only happen if the user
146 * pauses the stream (or if the decoder is buggy, which cannot
148 msg_Warn( p_aout, "output PTS is out of range (%"PRId64"), clearing out",
149 mdate() - start_date );
150 aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
151 date_Set( &exact_start_date, 0 );
155 aout_unlock_output_fifo( p_aout );
157 /* See if we have enough data to prepare a new buffer for the audio
158 * output. First : start date. */
161 /* Find the latest start date available. */
162 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
164 aout_input_t * p_input = p_aout->pp_inputs[i];
165 aout_fifo_t * p_fifo = &p_input->mixer.fifo;
166 aout_buffer_t * p_buffer;
168 if ( p_input->b_error || p_input->b_paused )
171 p_buffer = p_fifo->p_first;
172 while ( p_buffer != NULL && p_buffer->i_pts < mdate() )
174 msg_Warn( p_aout, "input PTS is out of range (%"PRId64"), "
175 "trashing", mdate() - p_buffer->i_pts );
176 p_buffer = aout_FifoPop( p_aout, p_fifo );
177 aout_BufferFree( p_buffer );
178 p_buffer = p_fifo->p_first;
179 p_input->mixer.begin = NULL;
182 if ( p_buffer == NULL )
187 if ( !start_date || start_date < p_buffer->i_pts )
189 date_Set( &exact_start_date, p_buffer->i_pts );
190 start_date = p_buffer->i_pts;
194 if ( i < p_aout->i_nb_inputs )
196 /* Interrupted before the end... We can't run. */
197 aout_unlock_input_fifos( p_aout );
201 date_Increment( &exact_start_date, p_aout->output.i_nb_samples );
202 end_date = date_Get( &exact_start_date );
204 /* Check that start_date and end_date are available for all input
206 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
208 aout_input_t * p_input = p_aout->pp_inputs[i];
209 aout_fifo_t * p_fifo = &p_input->mixer.fifo;
210 aout_buffer_t * p_buffer;
214 p_input->mixer.is_invalid = p_input->b_error || p_input->b_paused;
215 if ( p_input->mixer.is_invalid )
217 if ( i_first_input == i ) i_first_input++;
221 p_buffer = p_fifo->p_first;
222 if ( p_buffer == NULL )
227 /* Check for the continuity of start_date */
228 while ( p_buffer != NULL
229 && p_buffer->i_pts + p_buffer->i_length < start_date - 1 )
231 /* We authorize a +-1 because rounding errors get compensated
233 aout_buffer_t * p_next = p_buffer->p_next;
234 msg_Warn( p_aout, "the mixer got a packet in the past (%"PRId64")",
235 start_date - (p_buffer->i_pts + p_buffer->i_length) );
236 aout_BufferFree( p_buffer );
237 p_fifo->p_first = p_buffer = p_next;
238 p_input->mixer.begin = NULL;
240 if ( p_buffer == NULL )
242 p_fifo->pp_last = &p_fifo->p_first;
246 /* Check that we have enough samples. */
249 p_buffer = p_fifo->p_first;
250 if ( p_buffer == NULL ) break;
251 if ( p_buffer->i_pts + p_buffer->i_length >= end_date ) break;
253 /* Check that all buffers are contiguous. */
254 prev_date = p_fifo->p_first->i_pts + p_fifo->p_first->i_length;
255 p_buffer = p_buffer->p_next;
257 for ( ; p_buffer != NULL; p_buffer = p_buffer->p_next )
259 if ( prev_date != p_buffer->i_pts )
262 "buffer hole, dropping packets (%"PRId64")",
263 p_buffer->i_pts - prev_date );
267 if ( p_buffer->i_pts + p_buffer->i_length >= end_date ) break;
268 prev_date = p_buffer->i_pts + p_buffer->i_length;
270 if ( b_drop_buffers )
272 aout_buffer_t * p_deleted = p_fifo->p_first;
273 while ( p_deleted != NULL && p_deleted != p_buffer )
275 aout_buffer_t * p_next = p_deleted->p_next;
276 aout_BufferFree( p_deleted );
279 p_fifo->p_first = p_deleted; /* == p_buffer */
283 if ( p_buffer == NULL ) break;
285 p_buffer = p_fifo->p_first;
286 if ( !AOUT_FMT_NON_LINEAR( &p_aout->p_mixer->fmt ) )
288 /* Additionally check that p_first_byte_to_mix is well
290 mtime_t i_buffer = (start_date - p_buffer->i_pts)
291 * p_aout->p_mixer->fmt.i_bytes_per_frame
292 * p_aout->p_mixer->fmt.i_rate
293 / p_aout->p_mixer->fmt.i_frame_length
295 ptrdiff_t mixer_nb_bytes;
297 if ( p_input->mixer.begin == NULL )
299 p_input->mixer.begin = p_buffer->p_buffer;
301 mixer_nb_bytes = p_input->mixer.begin - p_buffer->p_buffer;
303 if ( !((i_buffer + p_aout->p_mixer->fmt.i_bytes_per_frame
305 (i_buffer < p_aout->p_mixer->fmt.i_bytes_per_frame
308 msg_Warn( p_aout, "mixer start isn't output start (%"PRId64")",
309 i_buffer - mixer_nb_bytes );
311 /* Round to the nearest multiple */
312 i_buffer /= p_aout->p_mixer->fmt.i_bytes_per_frame;
313 i_buffer *= p_aout->p_mixer->fmt.i_bytes_per_frame;
316 /* Is it really the best way to do it ? */
317 aout_lock_output_fifo( p_aout );
318 aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
319 date_Set( &exact_start_date, 0 );
320 aout_unlock_output_fifo( p_aout );
324 p_input->mixer.begin = p_buffer->p_buffer + i_buffer;
329 if ( i < p_aout->i_nb_inputs || i_first_input == p_aout->i_nb_inputs )
331 /* Interrupted before the end... We can't run. */
332 aout_unlock_input_fifos( p_aout );
337 p_output_buffer = aout_BufferAlloc( &p_aout->p_mixer->allocation,
338 ((uint64_t)p_aout->output.i_nb_samples * 1000000)
339 / p_aout->output.output.i_rate,
340 /* This is a bit kludgy, but is actually only used
341 * for the S/PDIF dummy mixer : */
342 p_aout->pp_inputs[i_first_input]->mixer.fifo.p_first);
343 if ( p_output_buffer == NULL )
345 aout_unlock_input_fifos( p_aout );
348 /* This is again a bit kludgy - for the S/PDIF mixer. */
349 if ( p_aout->p_mixer->allocation.b_alloc )
351 p_output_buffer->i_nb_samples = p_aout->output.i_nb_samples;
352 p_output_buffer->i_buffer = p_aout->output.i_nb_samples
353 * p_aout->p_mixer->fmt.i_bytes_per_frame
354 / p_aout->p_mixer->fmt.i_frame_length;
356 p_output_buffer->i_pts = start_date;
357 p_output_buffer->i_length = end_date - start_date;
359 p_aout->p_mixer->mix( p_aout->p_mixer, p_output_buffer );
361 aout_unlock_input_fifos( p_aout );
363 aout_OutputPlay( p_aout, p_output_buffer );
368 /*****************************************************************************
369 * aout_MixerRun: entry point for the mixer & post-filters processing
370 *****************************************************************************
371 * Please note that you must hold the mixer lock.
372 *****************************************************************************/
373 void aout_MixerRun( aout_instance_t * p_aout )
375 while( MixBuffer( p_aout ) != -1 );
378 /*****************************************************************************
379 * aout_MixerMultiplierSet: set p_aout->mixer.f_multiplier
380 *****************************************************************************
381 * Please note that we assume that you own the mixer lock when entering this
382 * function. This function returns -1 on error.
383 *****************************************************************************/
384 int aout_MixerMultiplierSet( aout_instance_t * p_aout, float f_multiplier )
386 float f_old = p_aout->mixer_multiplier;
387 bool b_new_mixer = false;
389 if ( p_aout->p_mixer )
391 aout_MixerDelete( p_aout );
395 p_aout->mixer_multiplier = f_multiplier;
397 if ( b_new_mixer && aout_MixerNew( p_aout ) )
399 p_aout->mixer_multiplier = f_old;
400 aout_MixerNew( p_aout );
407 /*****************************************************************************
408 * aout_MixerMultiplierGet: get p_aout->mixer.f_multiplier
409 *****************************************************************************
410 * Please note that we assume that you own the mixer lock when entering this
411 * function. This function returns -1 on error.
412 *****************************************************************************/
413 int aout_MixerMultiplierGet( aout_instance_t * p_aout, float * pf_multiplier )
415 *pf_multiplier = p_aout->mixer_multiplier;