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 "aout_internal.h"
34 /*****************************************************************************
35 * aout_MixerNew: prepare a mixer plug-in
36 *****************************************************************************
37 * Please note that you must hold the mixer lock.
38 *****************************************************************************/
39 int aout_MixerNew( aout_instance_t * p_aout )
41 p_aout->mixer.p_module = module_Need( p_aout, "audio mixer", NULL, 0 );
42 if ( p_aout->mixer.p_module == NULL )
44 msg_Err( p_aout, "no suitable audio mixer" );
47 p_aout->mixer.b_error = 0;
51 /*****************************************************************************
52 * aout_MixerDelete: delete the mixer
53 *****************************************************************************
54 * Please note that you must hold the mixer lock.
55 *****************************************************************************/
56 void aout_MixerDelete( aout_instance_t * p_aout )
58 if ( p_aout->mixer.b_error ) return;
59 module_Unneed( p_aout, p_aout->mixer.p_module );
60 p_aout->mixer.b_error = 1;
63 /*****************************************************************************
64 * MixBuffer: try to prepare one output buffer
65 *****************************************************************************
66 * Please note that you must hold the mixer lock.
67 *****************************************************************************/
68 static int MixBuffer( aout_instance_t * p_aout )
70 int i, i_first_input = 0;
71 aout_buffer_t * p_output_buffer;
72 mtime_t start_date, end_date;
73 audio_date_t exact_start_date;
75 if ( p_aout->mixer.b_error )
77 /* Free all incoming buffers. */
78 vlc_mutex_lock( &p_aout->input_fifos_lock );
79 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
81 aout_input_t * p_input = p_aout->pp_inputs[i];
82 aout_buffer_t * p_buffer = p_input->fifo.p_first;
83 if ( p_input->b_error ) continue;
84 while ( p_buffer != NULL )
86 aout_buffer_t * p_next = p_buffer->p_next;
87 aout_BufferFree( p_buffer );
91 vlc_mutex_unlock( &p_aout->input_fifos_lock );
96 vlc_mutex_lock( &p_aout->output_fifo_lock );
97 vlc_mutex_lock( &p_aout->input_fifos_lock );
99 /* Retrieve the date of the next buffer. */
100 memcpy( &exact_start_date, &p_aout->output.fifo.end_date,
101 sizeof(audio_date_t) );
102 start_date = aout_DateGet( &exact_start_date );
104 if ( start_date != 0 && start_date < mdate() )
106 /* The output is _very_ late. This can only happen if the user
107 * pauses the stream (or if the decoder is buggy, which cannot
109 msg_Warn( p_aout, "output PTS is out of range ("I64Fd"), clearing out",
110 mdate() - start_date );
111 aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
112 aout_DateSet( &exact_start_date, 0 );
116 vlc_mutex_unlock( &p_aout->output_fifo_lock );
118 /* See if we have enough data to prepare a new buffer for the audio
119 * output. First : start date. */
122 /* Find the latest start date available. */
123 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
125 aout_input_t * p_input = p_aout->pp_inputs[i];
126 aout_fifo_t * p_fifo = &p_input->fifo;
127 aout_buffer_t * p_buffer;
129 if ( p_input->b_error ) continue;
131 p_buffer = p_fifo->p_first;
132 while ( p_buffer != NULL && p_buffer->start_date < mdate() )
134 msg_Warn( p_aout, "input PTS is out of range ("I64Fd"), "
135 "trashing", mdate() - p_buffer->start_date );
136 p_buffer = aout_FifoPop( p_aout, p_fifo );
137 aout_BufferFree( p_buffer );
138 if( p_input->p_input_thread )
140 // stats_UpdateInteger( p_input->p_input_thread,
141 // "lost_abuffers", 1 );
143 p_buffer = p_fifo->p_first;
144 p_input->p_first_byte_to_mix = NULL;
147 if ( p_buffer == NULL )
152 if ( !start_date || start_date < p_buffer->start_date )
154 aout_DateSet( &exact_start_date, p_buffer->start_date );
155 start_date = p_buffer->start_date;
159 if ( i < p_aout->i_nb_inputs )
161 /* Interrupted before the end... We can't run. */
162 vlc_mutex_unlock( &p_aout->input_fifos_lock );
166 aout_DateIncrement( &exact_start_date, p_aout->output.i_nb_samples );
167 end_date = aout_DateGet( &exact_start_date );
169 /* Check that start_date and end_date are available for all input
171 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
173 aout_input_t * p_input = p_aout->pp_inputs[i];
174 aout_fifo_t * p_fifo = &p_input->fifo;
175 aout_buffer_t * p_buffer;
177 vlc_bool_t b_drop_buffers;
179 if ( p_input->b_error )
181 if ( i_first_input == i ) i_first_input++;
185 p_buffer = p_fifo->p_first;
186 if ( p_buffer == NULL )
191 /* Check for the continuity of start_date */
192 while ( p_buffer != NULL && p_buffer->end_date < start_date - 1 )
194 /* We authorize a +-1 because rounding errors get compensated
196 aout_buffer_t * p_next = p_buffer->p_next;
197 msg_Warn( p_aout, "the mixer got a packet in the past ("I64Fd")",
198 start_date - p_buffer->end_date );
199 aout_BufferFree( p_buffer );
200 if( p_input->p_input_thread )
202 // stats_UpdateInteger( p_input->p_input_thread,
203 // "lost_abuffers", 1 );
205 p_fifo->p_first = p_buffer = p_next;
206 p_input->p_first_byte_to_mix = NULL;
208 if ( p_buffer == NULL )
210 p_fifo->pp_last = &p_fifo->p_first;
214 /* Check that we have enough samples. */
217 p_buffer = p_fifo->p_first;
218 if ( p_buffer == NULL ) break;
219 if ( p_buffer->end_date >= end_date ) break;
221 /* Check that all buffers are contiguous. */
222 prev_date = p_fifo->p_first->end_date;
223 p_buffer = p_buffer->p_next;
225 for ( ; p_buffer != NULL; p_buffer = p_buffer->p_next )
227 if ( prev_date != p_buffer->start_date )
230 "buffer hole, dropping packets ("I64Fd")",
231 p_buffer->start_date - prev_date );
235 if ( p_buffer->end_date >= end_date ) break;
236 prev_date = p_buffer->end_date;
238 if ( b_drop_buffers )
240 aout_buffer_t * p_deleted = p_fifo->p_first;
241 while ( p_deleted != NULL && p_deleted != p_buffer )
243 aout_buffer_t * p_next = p_deleted->p_next;
244 aout_BufferFree( p_deleted );
247 p_fifo->p_first = p_deleted; /* == p_buffer */
251 if ( p_buffer == NULL ) break;
253 p_buffer = p_fifo->p_first;
254 if ( !AOUT_FMT_NON_LINEAR( &p_aout->mixer.mixer ) )
256 /* Additionally check that p_first_byte_to_mix is well
258 mtime_t i_nb_bytes = (start_date - p_buffer->start_date)
259 * p_aout->mixer.mixer.i_bytes_per_frame
260 * p_aout->mixer.mixer.i_rate
261 / p_aout->mixer.mixer.i_frame_length
263 ptrdiff_t mixer_nb_bytes;
265 if ( p_input->p_first_byte_to_mix == NULL )
267 p_input->p_first_byte_to_mix = p_buffer->p_buffer;
269 mixer_nb_bytes = p_input->p_first_byte_to_mix - p_buffer->p_buffer;
271 if ( !((i_nb_bytes + p_aout->mixer.mixer.i_bytes_per_frame
273 (i_nb_bytes < p_aout->mixer.mixer.i_bytes_per_frame
276 msg_Warn( p_aout, "mixer start isn't output start ("I64Fd")",
277 i_nb_bytes - mixer_nb_bytes );
279 /* Round to the nearest multiple */
280 i_nb_bytes /= p_aout->mixer.mixer.i_bytes_per_frame;
281 i_nb_bytes *= p_aout->mixer.mixer.i_bytes_per_frame;
284 /* Is it really the best way to do it ? */
285 aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
286 aout_DateSet( &exact_start_date, 0 );
290 p_input->p_first_byte_to_mix = p_buffer->p_buffer + i_nb_bytes;
295 if ( i < p_aout->i_nb_inputs || i_first_input == p_aout->i_nb_inputs )
297 /* Interrupted before the end... We can't run. */
298 vlc_mutex_unlock( &p_aout->input_fifos_lock );
303 aout_BufferAlloc( &p_aout->mixer.output_alloc,
304 ((uint64_t)p_aout->output.i_nb_samples * 1000000)
305 / p_aout->output.output.i_rate,
306 /* This is a bit kludgy, but is actually only used
307 * for the S/PDIF dummy mixer : */
308 p_aout->pp_inputs[i_first_input]->fifo.p_first,
310 if ( p_output_buffer == NULL )
312 msg_Err( p_aout, "out of memory" );
313 vlc_mutex_unlock( &p_aout->input_fifos_lock );
316 /* This is again a bit kludgy - for the S/PDIF mixer. */
317 if ( p_aout->mixer.output_alloc.i_alloc_type != AOUT_ALLOC_NONE )
319 p_output_buffer->i_nb_samples = p_aout->output.i_nb_samples;
320 p_output_buffer->i_nb_bytes = p_aout->output.i_nb_samples
321 * p_aout->mixer.mixer.i_bytes_per_frame
322 / p_aout->mixer.mixer.i_frame_length;
324 p_output_buffer->start_date = start_date;
325 p_output_buffer->end_date = end_date;
327 p_aout->mixer.pf_do_work( p_aout, p_output_buffer );
329 vlc_mutex_unlock( &p_aout->input_fifos_lock );
331 aout_OutputPlay( p_aout, p_output_buffer );
336 /*****************************************************************************
337 * aout_MixerRun: entry point for the mixer & post-filters processing
338 *****************************************************************************
339 * Please note that you must hold the mixer lock.
340 *****************************************************************************/
341 void aout_MixerRun( aout_instance_t * p_aout )
343 while( MixBuffer( p_aout ) != -1 );
346 /*****************************************************************************
347 * aout_MixerMultiplierSet: set p_aout->mixer.f_multiplier
348 *****************************************************************************
349 * Please note that we assume that you own the mixer lock when entering this
350 * function. This function returns -1 on error.
351 *****************************************************************************/
352 int aout_MixerMultiplierSet( aout_instance_t * p_aout, float f_multiplier )
354 float f_old = p_aout->mixer.f_multiplier;
355 vlc_bool_t b_new_mixer = 0;
357 if ( !p_aout->mixer.b_error )
359 aout_MixerDelete( p_aout );
363 p_aout->mixer.f_multiplier = f_multiplier;
365 if ( b_new_mixer && aout_MixerNew( p_aout ) )
367 p_aout->mixer.f_multiplier = f_old;
368 aout_MixerNew( p_aout );
375 /*****************************************************************************
376 * aout_MixerMultiplierGet: get p_aout->mixer.f_multiplier
377 *****************************************************************************
378 * Please note that we assume that you own the mixer lock when entering this
379 * function. This function returns -1 on error.
380 *****************************************************************************/
381 int aout_MixerMultiplierGet( aout_instance_t * p_aout, float * pf_multiplier )
383 *pf_multiplier = p_aout->mixer.f_multiplier;