1 /*****************************************************************************
2 * intf.c : audio output API towards the interface modules
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., 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"
39 * The hardware volume cannot be set if the output module gets deleted, so
40 * we must take the mixer lock. The software volume cannot be set while the
41 * mixer is running, so we need the mixer lock (too).
43 * Here is a schematic of the i_volume range :
45 * |------------------------------+---------------------------------------|
48 * Between 0 and pi_soft, the volume is done in hardware by the output
49 * module. Above, the output module will change p_aout->mixer.i_multiplier
50 * (done in software). This scaling may result * in cropping errors and
51 * should be avoided as much as possible.
53 * It is legal to have *pi_soft == 0, and do everything in software.
54 * It is also legal to have *pi_soft == 1024, and completely avoid
55 * software scaling. However, some streams (esp. A/52) are encoded with
56 * a very low volume and users may complain.
59 /*****************************************************************************
60 * aout_VolumeGet : get the volume of the output device
61 *****************************************************************************/
62 int __aout_VolumeGet( vlc_object_t * p_object, audio_volume_t * pi_volume )
64 int i_volume, i_result = 0;
65 aout_instance_t * p_aout = vlc_object_find( p_object, VLC_OBJECT_AOUT,
68 i_volume = config_GetInt( p_object, "volume" );
69 if ( pi_volume != NULL ) *pi_volume = (audio_volume_t)i_volume;
71 if ( p_aout == NULL ) return 0;
73 vlc_mutex_lock( &p_aout->mixer_lock );
74 if ( !p_aout->mixer.b_error )
76 i_result = p_aout->output.pf_volume_get( p_aout, pi_volume );
78 vlc_mutex_unlock( &p_aout->mixer_lock );
80 vlc_object_release( p_aout );
84 /*****************************************************************************
85 * aout_VolumeSet : set the volume of the output device
86 *****************************************************************************/
87 int __aout_VolumeSet( vlc_object_t * p_object, audio_volume_t i_volume )
90 aout_instance_t *p_aout = vlc_object_find( p_object, VLC_OBJECT_AOUT, FIND_ANYWHERE );
93 config_PutInt( p_object, "volume", i_volume );
95 if ( p_aout == NULL ) return 0;
97 vlc_mutex_lock( &p_aout->mixer_lock );
98 if ( !p_aout->mixer.b_error )
100 i_result = p_aout->output.pf_volume_set( p_aout, i_volume );
102 vlc_mutex_unlock( &p_aout->mixer_lock );
104 vlc_object_release( p_aout );
106 val.b_bool = VLC_TRUE;
107 var_Set( p_aout, "intf-change", val );
108 var_Set( p_aout->p_vlc, "volume-change", val );
109 vlc_object_release( p_aout );
113 /*****************************************************************************
114 * aout_VolumeInfos : get the boundary pi_soft
115 *****************************************************************************/
116 int __aout_VolumeInfos( vlc_object_t * p_object, audio_volume_t * pi_soft )
118 aout_instance_t * p_aout = vlc_object_find( p_object, VLC_OBJECT_AOUT,
122 if ( p_aout == NULL ) return 0;
124 vlc_mutex_lock( &p_aout->mixer_lock );
125 if ( p_aout->mixer.b_error )
127 /* The output module is destroyed. */
132 i_result = p_aout->output.pf_volume_infos( p_aout, pi_soft );
134 vlc_mutex_unlock( &p_aout->mixer_lock );
136 vlc_object_release( p_aout );
140 /*****************************************************************************
141 * aout_VolumeUp : raise the output volume
142 *****************************************************************************
143 * If pi_volume != NULL, *pi_volume will contain the volume at the end of the
145 *****************************************************************************/
146 int __aout_VolumeUp( vlc_object_t * p_object, int i_nb_steps,
147 audio_volume_t * pi_volume )
149 aout_instance_t * p_aout = vlc_object_find( p_object, VLC_OBJECT_AOUT,
151 int i_result = 0, i_volume = 0, i_volume_step = 0;
153 i_volume_step = config_GetInt( p_object->p_vlc, "volume-step" );
154 i_volume = config_GetInt( p_object, "volume" );
155 i_volume += i_volume_step * i_nb_steps;
156 if ( i_volume > AOUT_VOLUME_MAX )
158 i_volume = AOUT_VOLUME_MAX;
160 config_PutInt( p_object, "volume", i_volume );
161 var_Create( p_object->p_libvlc, "saved-volume", VLC_VAR_INTEGER );
162 var_SetInteger( p_object->p_libvlc, "saved-volume" , (audio_volume_t) i_volume );
163 if ( pi_volume != NULL ) *pi_volume = (audio_volume_t) i_volume;
165 if ( p_aout == NULL ) return 0;
167 vlc_mutex_lock( &p_aout->mixer_lock );
168 if ( !p_aout->mixer.b_error )
170 i_result = p_aout->output.pf_volume_set( p_aout, (audio_volume_t) i_volume );
172 vlc_mutex_unlock( &p_aout->mixer_lock );
174 vlc_object_release( p_aout );
178 /*****************************************************************************
179 * aout_VolumeDown : lower the output volume
180 *****************************************************************************
181 * If pi_volume != NULL, *pi_volume will contain the volume at the end of the
183 *****************************************************************************/
184 int __aout_VolumeDown( vlc_object_t * p_object, int i_nb_steps,
185 audio_volume_t * pi_volume )
187 aout_instance_t * p_aout = vlc_object_find( p_object, VLC_OBJECT_AOUT,
189 int i_result = 0, i_volume = 0, i_volume_step = 0;
191 i_volume_step = config_GetInt( p_object->p_vlc, "volume-step" );
192 i_volume = config_GetInt( p_object, "volume" );
193 i_volume -= i_volume_step * i_nb_steps;
194 if ( i_volume < AOUT_VOLUME_MIN )
196 i_volume = AOUT_VOLUME_MIN;
198 config_PutInt( p_object, "volume", i_volume );
199 var_Create( p_object->p_libvlc, "saved-volume", VLC_VAR_INTEGER );
200 var_SetInteger( p_object->p_libvlc, "saved-volume", (audio_volume_t) i_volume );
201 if ( pi_volume != NULL ) *pi_volume = (audio_volume_t) i_volume;
203 if ( p_aout == NULL ) return 0;
205 vlc_mutex_lock( &p_aout->mixer_lock );
206 if ( !p_aout->mixer.b_error )
208 i_result = p_aout->output.pf_volume_set( p_aout, (audio_volume_t) i_volume );
210 vlc_mutex_unlock( &p_aout->mixer_lock );
212 vlc_object_release( p_aout );
216 /*****************************************************************************
217 * aout_VolumeMute : Mute/un-mute the output volume
218 *****************************************************************************
219 * If pi_volume != NULL, *pi_volume will contain the volume at the end of the
220 * function (muted => 0).
221 *****************************************************************************/
222 int __aout_VolumeMute( vlc_object_t * p_object, audio_volume_t * pi_volume )
225 audio_volume_t i_volume;
227 i_volume = (audio_volume_t)config_GetInt( p_object, "volume" );
231 i_result = aout_VolumeSet( p_object, AOUT_VOLUME_MIN );
232 var_Create( p_object->p_libvlc, "saved-volume", VLC_VAR_INTEGER );
233 var_SetInteger( p_object->p_libvlc, "saved-volume", (int)i_volume );
234 if ( pi_volume != NULL ) *pi_volume = AOUT_VOLUME_MIN;
239 var_Create( p_object->p_libvlc, "saved-volume", VLC_VAR_INTEGER );
240 i_volume = (audio_volume_t)var_GetInteger( p_object->p_libvlc,
242 i_result = aout_VolumeSet( p_object, i_volume );
243 if ( pi_volume != NULL ) *pi_volume = i_volume;
250 * The next functions are not supposed to be called by the interface, but
251 * are placeholders for software-only scaling.
254 /* Meant to be called by the output plug-in's Open(). */
255 void aout_VolumeSoftInit( aout_instance_t * p_aout )
259 p_aout->output.pf_volume_infos = aout_VolumeSoftInfos;
260 p_aout->output.pf_volume_get = aout_VolumeSoftGet;
261 p_aout->output.pf_volume_set = aout_VolumeSoftSet;
263 i_volume = config_GetInt( p_aout, "volume" );
264 if ( i_volume < AOUT_VOLUME_MIN )
266 i_volume = AOUT_VOLUME_DEFAULT;
268 else if ( i_volume > AOUT_VOLUME_MAX )
270 i_volume = AOUT_VOLUME_MAX;
273 aout_VolumeSoftSet( p_aout, (audio_volume_t)i_volume );
276 /* Placeholder for pf_volume_infos(). */
277 int aout_VolumeSoftInfos( aout_instance_t * p_aout, audio_volume_t * pi_soft )
283 /* Placeholder for pf_volume_get(). */
284 int aout_VolumeSoftGet( aout_instance_t * p_aout, audio_volume_t * pi_volume )
286 *pi_volume = p_aout->output.i_volume;
291 /* Placeholder for pf_volume_set(). */
292 int aout_VolumeSoftSet( aout_instance_t * p_aout, audio_volume_t i_volume )
294 aout_MixerMultiplierSet( p_aout, (float)i_volume / AOUT_VOLUME_DEFAULT );
295 p_aout->output.i_volume = i_volume;
300 * The next functions are not supposed to be called by the interface, but
301 * are placeholders for unsupported scaling.
304 /* Meant to be called by the output plug-in's Open(). */
305 void aout_VolumeNoneInit( aout_instance_t * p_aout )
307 p_aout->output.pf_volume_infos = aout_VolumeNoneInfos;
308 p_aout->output.pf_volume_get = aout_VolumeNoneGet;
309 p_aout->output.pf_volume_set = aout_VolumeNoneSet;
312 /* Placeholder for pf_volume_infos(). */
313 int aout_VolumeNoneInfos( aout_instance_t * p_aout, audio_volume_t * pi_soft )
318 /* Placeholder for pf_volume_get(). */
319 int aout_VolumeNoneGet( aout_instance_t * p_aout, audio_volume_t * pi_volume )
324 /* Placeholder for pf_volume_set(). */
325 int aout_VolumeNoneSet( aout_instance_t * p_aout, audio_volume_t i_volume )
332 * Pipelines management
335 /*****************************************************************************
336 * aout_Restart : re-open the output device and rebuild the input and output
338 *****************************************************************************
339 * This function is used whenever the parameters of the output plug-in are
340 * changed (eg. selecting S/PDIF or PCM).
341 *****************************************************************************/
342 int aout_Restart( aout_instance_t * p_aout )
345 vlc_bool_t b_error = 0;
347 vlc_mutex_lock( &p_aout->mixer_lock );
349 if ( p_aout->i_nb_inputs == 0 )
351 vlc_mutex_unlock( &p_aout->mixer_lock );
352 msg_Err( p_aout, "no decoder thread" );
356 /* Lock all inputs. */
357 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
359 vlc_mutex_lock( &p_aout->pp_inputs[i]->lock );
360 aout_InputDelete( p_aout, p_aout->pp_inputs[i] );
363 aout_MixerDelete( p_aout );
365 /* Re-open the output plug-in. */
366 aout_OutputDelete( p_aout );
368 if ( aout_OutputNew( p_aout, &p_aout->pp_inputs[0]->input ) == -1 )
370 /* Release all locks and report the error. */
371 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
373 vlc_mutex_unlock( &p_aout->pp_inputs[i]->lock );
375 vlc_mutex_unlock( &p_aout->mixer_lock );
379 if ( aout_MixerNew( p_aout ) == -1 )
381 aout_OutputDelete( p_aout );
382 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
384 vlc_mutex_unlock( &p_aout->pp_inputs[i]->lock );
386 vlc_mutex_unlock( &p_aout->mixer_lock );
390 /* Re-open all inputs. */
391 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
393 aout_input_t * p_input = p_aout->pp_inputs[i];
395 b_error |= aout_InputNew( p_aout, p_input );
396 p_input->b_changed = 1;
397 vlc_mutex_unlock( &p_input->lock );
400 vlc_mutex_unlock( &p_aout->mixer_lock );
405 /*****************************************************************************
406 * aout_FindAndRestart : find the audio output instance and restart
407 *****************************************************************************
408 * This is used for callbacks of the configuration variables, and we believe
409 * that when those are changed, it is a significant change which implies
410 * rebuilding the audio-device and audio-channels variables.
411 *****************************************************************************/
412 int aout_FindAndRestart( vlc_object_t * p_this, const char *psz_name,
413 vlc_value_t oldval, vlc_value_t val, void *p_data )
415 aout_instance_t * p_aout = vlc_object_find( p_this, VLC_OBJECT_AOUT,
418 if ( p_aout == NULL ) return VLC_SUCCESS;
420 if ( var_Type( p_aout, "audio-device" ) != 0 )
422 var_Destroy( p_aout, "audio-device" );
424 if ( var_Type( p_aout, "audio-channels" ) != 0 )
426 var_Destroy( p_aout, "audio-channels" );
429 aout_Restart( p_aout );
430 vlc_object_release( p_aout );
435 /*****************************************************************************
436 * aout_ChannelsRestart : change the audio device or channels and restart
437 *****************************************************************************/
438 int aout_ChannelsRestart( vlc_object_t * p_this, const char * psz_variable,
439 vlc_value_t old_value, vlc_value_t new_value,
442 aout_instance_t * p_aout = (aout_instance_t *)p_this;
444 if ( !strcmp( psz_variable, "audio-device" ) )
446 /* This is supposed to be a significant change and supposes
447 * rebuilding the channel choices. */
448 if ( var_Type( p_aout, "audio-channels" ) >= 0 )
450 var_Destroy( p_aout, "audio-channels" );
453 aout_Restart( p_aout );