1 /*****************************************************************************
2 * common.c : audio output management of common data structures
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: common.c,v 1.9 2002/11/14 22:38:48 massiot Exp $
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
27 #include <stdlib.h> /* calloc(), malloc(), free() */
32 #include "audio_output.h"
33 #include "aout_internal.h"
37 * Instances management (internal and external)
40 /*****************************************************************************
41 * aout_New: initialize aout structure
42 *****************************************************************************/
43 aout_instance_t * __aout_New( vlc_object_t * p_parent )
45 aout_instance_t * p_aout;
47 /* Allocate descriptor. */
48 p_aout = vlc_object_create( p_parent, VLC_OBJECT_AOUT );
54 /* Initialize members. */
55 vlc_mutex_init( p_parent, &p_aout->input_fifos_lock );
56 vlc_mutex_init( p_parent, &p_aout->mixer_lock );
57 vlc_mutex_init( p_parent, &p_aout->output_fifo_lock );
58 p_aout->i_nb_inputs = 0;
59 p_aout->mixer.f_multiplier = 1.0;
60 p_aout->mixer.b_error = 1;
61 p_aout->output.b_starving = 1;
63 vlc_object_attach( p_aout, p_parent->p_vlc );
65 var_Create( p_aout, "physical-channels", VLC_VAR_INTEGER );
66 var_AddCallback( p_aout, "physical-channels", aout_ChannelsRestart,
68 var_Create( p_aout, "original-channels", VLC_VAR_INTEGER );
69 var_AddCallback( p_aout, "original-channels", aout_ChannelsRestart,
75 /*****************************************************************************
76 * aout_Delete: destroy aout structure
77 *****************************************************************************/
78 void aout_Delete( aout_instance_t * p_aout )
80 var_Destroy( p_aout, "channels" );
82 vlc_mutex_destroy( &p_aout->input_fifos_lock );
83 vlc_mutex_destroy( &p_aout->mixer_lock );
84 vlc_mutex_destroy( &p_aout->output_fifo_lock );
87 vlc_object_destroy( p_aout );
92 * Formats management (internal and external)
95 /*****************************************************************************
96 * aout_FormatNbChannels : return the number of channels
97 *****************************************************************************/
98 int aout_FormatNbChannels( const audio_sample_format_t * p_format )
100 static const u32 pi_channels[] =
101 { AOUT_CHAN_CENTER, AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
102 AOUT_CHAN_REARCENTER, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
106 for ( i = 0; i < sizeof(pi_channels)/sizeof(u32); i++ )
108 if ( p_format->i_physical_channels & pi_channels[i] ) i_nb++;
114 /*****************************************************************************
115 * aout_FormatPrepare : compute the number of bytes per frame & frame length
116 *****************************************************************************/
117 void aout_FormatPrepare( audio_sample_format_t * p_format )
121 switch ( p_format->i_format )
123 case VLC_FOURCC('u','8',' ',' '):
124 case VLC_FOURCC('s','8',' ',' '):
128 case VLC_FOURCC('u','1','6','l'):
129 case VLC_FOURCC('s','1','6','l'):
130 case VLC_FOURCC('u','1','6','b'):
131 case VLC_FOURCC('s','1','6','b'):
135 case VLC_FOURCC('f','l','3','2'):
136 case VLC_FOURCC('f','i','3','2'):
140 case VLC_FOURCC('s','p','d','i'):
141 case VLC_FOURCC('a','5','2',' '):
142 case VLC_FOURCC('d','t','s',' '):
144 /* For these formats the caller has to indicate the parameters
149 p_format->i_bytes_per_frame = i_result * aout_FormatNbChannels( p_format );
150 p_format->i_frame_length = 1;
153 /*****************************************************************************
154 * aout_FormatPrintChannels : print a channel in a human-readable form
155 *****************************************************************************/
156 const char * aout_FormatPrintChannels( const audio_sample_format_t * p_format )
158 switch ( p_format->i_physical_channels & AOUT_CHAN_PHYSMASK )
160 case AOUT_CHAN_CENTER:
161 if ( (p_format->i_original_channels & AOUT_CHAN_CENTER)
162 || (p_format->i_original_channels
163 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
165 else if ( p_format->i_original_channels & AOUT_CHAN_LEFT )
168 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT:
169 if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
171 else if ( p_format->i_original_channels & AOUT_CHAN_DUALMONO )
173 else if ( !(p_format->i_original_channels & AOUT_CHAN_RIGHT) )
174 return "Stereo/Left";
175 else if ( !(p_format->i_original_channels & AOUT_CHAN_LEFT) )
176 return "Stereo/Right";
178 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER:
180 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER:
182 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
183 | AOUT_CHAN_REARCENTER:
185 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
186 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
188 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
189 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
192 case AOUT_CHAN_CENTER | AOUT_CHAN_LFE:
193 if ( (p_format->i_original_channels & AOUT_CHAN_CENTER)
194 || (p_format->i_original_channels
195 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
197 else if ( p_format->i_original_channels & AOUT_CHAN_LEFT )
200 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE:
201 if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
203 else if ( p_format->i_original_channels & AOUT_CHAN_DUALMONO )
204 return "Dual-mono/LFE";
205 else if ( !(p_format->i_original_channels & AOUT_CHAN_RIGHT) )
206 return "Stereo/Left/LFE";
207 else if ( !(p_format->i_original_channels & AOUT_CHAN_LEFT) )
208 return "Stereo/Right/LFE";
210 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_LFE:
212 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER
215 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
216 | AOUT_CHAN_REARCENTER | AOUT_CHAN_LFE:
218 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
219 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE:
221 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
222 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE:
229 /*****************************************************************************
230 * aout_FormatPrint : print a format in a human-readable form
231 *****************************************************************************/
232 void aout_FormatPrint( aout_instance_t * p_aout, const char * psz_text,
233 const audio_sample_format_t * p_format )
235 msg_Dbg( p_aout, "%s format='%4.4s' rate=%d channels=%s", psz_text,
236 (char *)&p_format->i_format, p_format->i_rate,
237 aout_FormatPrintChannels( p_format ) );
240 /*****************************************************************************
241 * aout_FormatsPrint : print two formats in a human-readable form
242 *****************************************************************************/
243 void aout_FormatsPrint( aout_instance_t * p_aout, const char * psz_text,
244 const audio_sample_format_t * p_format1,
245 const audio_sample_format_t * p_format2 )
247 msg_Dbg( p_aout, "%s format='%4.4s'->'%4.4s' rate=%d->%d channels=%s->%s",
249 (char *)&p_format1->i_format, (char *)&p_format2->i_format,
250 p_format1->i_rate, p_format2->i_rate,
251 aout_FormatPrintChannels( p_format1 ),
252 aout_FormatPrintChannels( p_format2 ) );
257 * FIFO management (internal) - please understand that solving race conditions
258 * is _your_ job, ie. in the audio output you should own the mixer lock
259 * before calling any of these functions.
262 /*****************************************************************************
263 * aout_FifoInit : initialize the members of a FIFO
264 *****************************************************************************/
265 void aout_FifoInit( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
268 p_fifo->p_first = NULL;
269 p_fifo->pp_last = &p_fifo->p_first;
270 aout_DateInit( &p_fifo->end_date, i_rate );
273 /*****************************************************************************
274 * aout_FifoPush : push a packet into the FIFO
275 *****************************************************************************/
276 void aout_FifoPush( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
277 aout_buffer_t * p_buffer )
279 *p_fifo->pp_last = p_buffer;
280 p_fifo->pp_last = &p_buffer->p_next;
281 *p_fifo->pp_last = NULL;
282 /* Enforce the continuity of the stream. */
283 if ( aout_DateGet( &p_fifo->end_date ) )
285 p_buffer->start_date = aout_DateGet( &p_fifo->end_date );
286 p_buffer->end_date = aout_DateIncrement( &p_fifo->end_date,
287 p_buffer->i_nb_samples );
291 aout_DateSet( &p_fifo->end_date, p_buffer->end_date );
295 /*****************************************************************************
296 * aout_FifoSet : set end_date and trash all buffers (because they aren't
298 *****************************************************************************/
299 void aout_FifoSet( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
302 aout_buffer_t * p_buffer;
304 aout_DateSet( &p_fifo->end_date, date );
305 p_buffer = p_fifo->p_first;
306 while ( p_buffer != NULL )
308 aout_buffer_t * p_next = p_buffer->p_next;
309 aout_BufferFree( p_buffer );
312 p_fifo->p_first = NULL;
313 p_fifo->pp_last = &p_fifo->p_first;
316 /*****************************************************************************
317 * aout_FifoMoveDates : Move forwards or backwards all dates in the FIFO
318 *****************************************************************************/
319 void aout_FifoMoveDates( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
322 aout_buffer_t * p_buffer;
324 aout_DateMove( &p_fifo->end_date, difference );
325 p_buffer = p_fifo->p_first;
326 while ( p_buffer != NULL )
328 p_buffer->start_date += difference;
329 p_buffer->end_date += difference;
330 p_buffer = p_buffer->p_next;
334 /*****************************************************************************
335 * aout_FifoNextStart : return the current end_date
336 *****************************************************************************/
337 mtime_t aout_FifoNextStart( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
339 return aout_DateGet( &p_fifo->end_date );
342 /*****************************************************************************
343 * aout_FifoFirstDate : return the playing date of the first buffer in the
345 *****************************************************************************/
346 mtime_t aout_FifoFirstDate( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
348 return p_fifo->p_first ? p_fifo->p_first->start_date : 0;
351 /*****************************************************************************
352 * aout_FifoPop : get the next buffer out of the FIFO
353 *****************************************************************************/
354 aout_buffer_t * aout_FifoPop( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
356 aout_buffer_t * p_buffer;
357 p_buffer = p_fifo->p_first;
358 if ( p_buffer == NULL ) return NULL;
359 p_fifo->p_first = p_buffer->p_next;
360 if ( p_fifo->p_first == NULL )
362 p_fifo->pp_last = &p_fifo->p_first;
368 /*****************************************************************************
369 * aout_FifoDestroy : destroy a FIFO and its buffers
370 *****************************************************************************/
371 void aout_FifoDestroy( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
373 aout_buffer_t * p_buffer;
375 p_buffer = p_fifo->p_first;
376 while ( p_buffer != NULL )
378 aout_buffer_t * p_next = p_buffer->p_next;
379 aout_BufferFree( p_buffer );
386 * Date management (internal and external)
389 /*****************************************************************************
390 * aout_DateInit : set the divider of an audio_date_t
391 *****************************************************************************/
392 void aout_DateInit( audio_date_t * p_date, u32 i_divider )
395 p_date->i_divider = i_divider;
396 p_date->i_remainder = 0;
399 /*****************************************************************************
400 * aout_DateSet : set the date of an audio_date_t
401 *****************************************************************************/
402 void aout_DateSet( audio_date_t * p_date, mtime_t new_date )
404 p_date->date = new_date;
405 p_date->i_remainder = 0;
408 /*****************************************************************************
409 * aout_DateMove : move forwards or backwards the date of an audio_date_t
410 *****************************************************************************/
411 void aout_DateMove( audio_date_t * p_date, mtime_t difference )
413 p_date->date += difference;
416 /*****************************************************************************
417 * aout_DateGet : get the date of an audio_date_t
418 *****************************************************************************/
419 mtime_t aout_DateGet( const audio_date_t * p_date )
424 /*****************************************************************************
425 * aout_DateIncrement : increment the date and return the result, taking
426 * into account rounding errors
427 *****************************************************************************/
428 mtime_t aout_DateIncrement( audio_date_t * p_date, u32 i_nb_samples )
430 mtime_t i_dividend = (mtime_t)i_nb_samples * 1000000;
431 p_date->date += i_dividend / p_date->i_divider;
432 p_date->i_remainder += (int)(i_dividend % p_date->i_divider);
433 if ( p_date->i_remainder >= p_date->i_divider )
435 /* This is Bresenham algorithm. */
437 p_date->i_remainder -= p_date->i_divider;