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 *****************************************************************************/
37 #include "aout_internal.h"
38 /*****************************************************************************
39 * aout_MixerNew: prepare a mixer plug-in
40 *****************************************************************************
41 * Please note that you must hold the mixer lock.
42 *****************************************************************************/
43 int aout_MixerNew( aout_instance_t * p_aout )
45 p_aout->mixer.p_module = module_Need( p_aout, "audio mixer", NULL, 0 );
46 if ( p_aout->mixer.p_module == NULL )
48 msg_Err( p_aout, "no suitable audio mixer" );
51 p_aout->mixer.b_error = 0;
55 /*****************************************************************************
56 * aout_MixerDelete: delete the mixer
57 *****************************************************************************
58 * Please note that you must hold the mixer lock.
59 *****************************************************************************/
60 void aout_MixerDelete( aout_instance_t * p_aout )
62 if ( p_aout->mixer.b_error ) return;
63 module_Unneed( p_aout, p_aout->mixer.p_module );
64 p_aout->mixer.b_error = 1;
67 /*****************************************************************************
68 * MixBuffer: try to prepare one output buffer
69 *****************************************************************************
70 * Please note that you must hold the mixer lock.
71 *****************************************************************************/
72 static int MixBuffer( aout_instance_t * p_aout )
74 int i, i_first_input = 0;
75 aout_buffer_t * p_output_buffer;
76 mtime_t start_date, end_date;
77 audio_date_t exact_start_date;
79 if ( p_aout->mixer.b_error )
81 /* Free all incoming buffers. */
82 vlc_mutex_lock( &p_aout->input_fifos_lock );
83 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
85 aout_input_t * p_input = p_aout->pp_inputs[i];
86 aout_buffer_t * p_buffer = p_input->fifo.p_first;
87 if ( p_input->b_error ) continue;
88 while ( p_buffer != NULL )
90 aout_buffer_t * p_next = p_buffer->p_next;
91 aout_BufferFree( p_buffer );
95 vlc_mutex_unlock( &p_aout->input_fifos_lock );
100 vlc_mutex_lock( &p_aout->output_fifo_lock );
101 vlc_mutex_lock( &p_aout->input_fifos_lock );
103 /* Retrieve the date of the next buffer. */
104 memcpy( &exact_start_date, &p_aout->output.fifo.end_date,
105 sizeof(audio_date_t) );
106 start_date = aout_DateGet( &exact_start_date );
108 if ( start_date != 0 && start_date < mdate() )
110 /* The output is _very_ late. This can only happen if the user
111 * pauses the stream (or if the decoder is buggy, which cannot
113 msg_Warn( p_aout, "output PTS is out of range ("I64Fd"), clearing out",
114 mdate() - start_date );
115 aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
116 aout_DateSet( &exact_start_date, 0 );
120 vlc_mutex_unlock( &p_aout->output_fifo_lock );
122 /* See if we have enough data to prepare a new buffer for the audio
123 * output. First : start date. */
126 /* Find the latest start date available. */
127 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
129 aout_input_t * p_input = p_aout->pp_inputs[i];
130 aout_fifo_t * p_fifo = &p_input->fifo;
131 aout_buffer_t * p_buffer;
133 if ( p_input->b_error ) continue;
135 p_buffer = p_fifo->p_first;
136 while ( p_buffer != NULL && p_buffer->start_date < mdate() )
138 msg_Warn( p_aout, "input PTS is out of range ("I64Fd"), "
139 "trashing", mdate() - p_buffer->start_date );
140 p_buffer = aout_FifoPop( p_aout, p_fifo );
141 aout_BufferFree( p_buffer );
142 if( p_input->p_input_thread )
144 // stats_UpdateInteger( p_input->p_input_thread,
145 // "lost_abuffers", 1 );
147 p_buffer = p_fifo->p_first;
148 p_input->p_first_byte_to_mix = NULL;
151 if ( p_buffer == NULL )
156 if ( !start_date || start_date < p_buffer->start_date )
158 aout_DateSet( &exact_start_date, p_buffer->start_date );
159 start_date = p_buffer->start_date;
163 if ( i < p_aout->i_nb_inputs )
165 /* Interrupted before the end... We can't run. */
166 vlc_mutex_unlock( &p_aout->input_fifos_lock );
170 aout_DateIncrement( &exact_start_date, p_aout->output.i_nb_samples );
171 end_date = aout_DateGet( &exact_start_date );
173 /* Check that start_date and end_date are available for all input
175 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
177 aout_input_t * p_input = p_aout->pp_inputs[i];
178 aout_fifo_t * p_fifo = &p_input->fifo;
179 aout_buffer_t * p_buffer;
181 vlc_bool_t b_drop_buffers;
183 if ( p_input->b_error )
185 if ( i_first_input == i ) i_first_input++;
189 p_buffer = p_fifo->p_first;
190 if ( p_buffer == NULL )
195 /* Check for the continuity of start_date */
196 while ( p_buffer != NULL && p_buffer->end_date < start_date - 1 )
198 /* We authorize a +-1 because rounding errors get compensated
200 aout_buffer_t * p_next = p_buffer->p_next;
201 msg_Warn( p_aout, "the mixer got a packet in the past ("I64Fd")",
202 start_date - p_buffer->end_date );
203 aout_BufferFree( p_buffer );
204 if( p_input->p_input_thread )
206 // stats_UpdateInteger( p_input->p_input_thread,
207 // "lost_abuffers", 1 );
209 p_fifo->p_first = p_buffer = p_next;
210 p_input->p_first_byte_to_mix = NULL;
212 if ( p_buffer == NULL )
214 p_fifo->pp_last = &p_fifo->p_first;
218 /* Check that we have enough samples. */
221 p_buffer = p_fifo->p_first;
222 if ( p_buffer == NULL ) break;
223 if ( p_buffer->end_date >= end_date ) break;
225 /* Check that all buffers are contiguous. */
226 prev_date = p_fifo->p_first->end_date;
227 p_buffer = p_buffer->p_next;
229 for ( ; p_buffer != NULL; p_buffer = p_buffer->p_next )
231 if ( prev_date != p_buffer->start_date )
234 "buffer hole, dropping packets ("I64Fd")",
235 p_buffer->start_date - prev_date );
239 if ( p_buffer->end_date >= end_date ) break;
240 prev_date = p_buffer->end_date;
242 if ( b_drop_buffers )
244 aout_buffer_t * p_deleted = p_fifo->p_first;
245 while ( p_deleted != NULL && p_deleted != p_buffer )
247 aout_buffer_t * p_next = p_deleted->p_next;
248 aout_BufferFree( p_deleted );
251 p_fifo->p_first = p_deleted; /* == p_buffer */
255 if ( p_buffer == NULL ) break;
257 p_buffer = p_fifo->p_first;
258 if ( !AOUT_FMT_NON_LINEAR( &p_aout->mixer.mixer ) )
260 /* Additionally check that p_first_byte_to_mix is well
262 mtime_t i_nb_bytes = (start_date - p_buffer->start_date)
263 * p_aout->mixer.mixer.i_bytes_per_frame
264 * p_aout->mixer.mixer.i_rate
265 / p_aout->mixer.mixer.i_frame_length
267 ptrdiff_t mixer_nb_bytes;
269 if ( p_input->p_first_byte_to_mix == NULL )
271 p_input->p_first_byte_to_mix = p_buffer->p_buffer;
273 mixer_nb_bytes = p_input->p_first_byte_to_mix - p_buffer->p_buffer;
275 if ( !((i_nb_bytes + p_aout->mixer.mixer.i_bytes_per_frame
277 (i_nb_bytes < p_aout->mixer.mixer.i_bytes_per_frame
280 msg_Warn( p_aout, "mixer start isn't output start ("I64Fd")",
281 i_nb_bytes - mixer_nb_bytes );
283 /* Round to the nearest multiple */
284 i_nb_bytes /= p_aout->mixer.mixer.i_bytes_per_frame;
285 i_nb_bytes *= p_aout->mixer.mixer.i_bytes_per_frame;
288 /* Is it really the best way to do it ? */
289 aout_FifoSet( p_aout, &p_aout->output.fifo, 0 );
290 aout_DateSet( &exact_start_date, 0 );
294 p_input->p_first_byte_to_mix = p_buffer->p_buffer + i_nb_bytes;
299 if ( i < p_aout->i_nb_inputs || i_first_input == p_aout->i_nb_inputs )
301 /* Interrupted before the end... We can't run. */
302 vlc_mutex_unlock( &p_aout->input_fifos_lock );
307 aout_BufferAlloc( &p_aout->mixer.output_alloc,
308 ((uint64_t)p_aout->output.i_nb_samples * 1000000)
309 / p_aout->output.output.i_rate,
310 /* This is a bit kludgy, but is actually only used
311 * for the S/PDIF dummy mixer : */
312 p_aout->pp_inputs[i_first_input]->fifo.p_first,
314 if ( p_output_buffer == NULL )
316 msg_Err( p_aout, "out of memory" );
317 vlc_mutex_unlock( &p_aout->input_fifos_lock );
320 /* This is again a bit kludgy - for the S/PDIF mixer. */
321 if ( p_aout->mixer.output_alloc.i_alloc_type != AOUT_ALLOC_NONE )
323 p_output_buffer->i_nb_samples = p_aout->output.i_nb_samples;
324 p_output_buffer->i_nb_bytes = p_aout->output.i_nb_samples
325 * p_aout->mixer.mixer.i_bytes_per_frame
326 / p_aout->mixer.mixer.i_frame_length;
328 p_output_buffer->start_date = start_date;
329 p_output_buffer->end_date = end_date;
331 p_aout->mixer.pf_do_work( p_aout, p_output_buffer );
333 vlc_mutex_unlock( &p_aout->input_fifos_lock );
335 aout_OutputPlay( p_aout, p_output_buffer );
340 /*****************************************************************************
341 * aout_MixerRun: entry point for the mixer & post-filters processing
342 *****************************************************************************
343 * Please note that you must hold the mixer lock.
344 *****************************************************************************/
345 void aout_MixerRun( aout_instance_t * p_aout )
347 while( MixBuffer( p_aout ) != -1 );
350 /*****************************************************************************
351 * aout_MixerMultiplierSet: set p_aout->mixer.f_multiplier
352 *****************************************************************************
353 * Please note that we assume that you own the mixer lock when entering this
354 * function. This function returns -1 on error.
355 *****************************************************************************/
356 int aout_MixerMultiplierSet( aout_instance_t * p_aout, float f_multiplier )
358 float f_old = p_aout->mixer.f_multiplier;
359 vlc_bool_t b_new_mixer = 0;
361 if ( !p_aout->mixer.b_error )
363 aout_MixerDelete( p_aout );
367 p_aout->mixer.f_multiplier = f_multiplier;
369 if ( b_new_mixer && aout_MixerNew( p_aout ) )
371 p_aout->mixer.f_multiplier = f_old;
372 aout_MixerNew( p_aout );
379 /*****************************************************************************
380 * aout_MixerMultiplierGet: get p_aout->mixer.f_multiplier
381 *****************************************************************************
382 * Please note that we assume that you own the mixer lock when entering this
383 * function. This function returns -1 on error.
384 *****************************************************************************/
385 int aout_MixerMultiplierGet( aout_instance_t * p_aout, float * pf_multiplier )
387 *pf_multiplier = p_aout->mixer.f_multiplier;