1 /*****************************************************************************
2 * intf.c : audio output API towards the interface modules
3 *****************************************************************************
4 * Copyright (C) 2002-2007 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 *****************************************************************************/
32 #include <vlc_common.h>
35 #include <stdlib.h> /* calloc(), malloc(), free() */
39 #include "aout_internal.h"
41 #include <vlc_playlist.h>
43 static aout_instance_t *findAout (vlc_object_t *obj)
45 input_thread_t *(*pf_find_input) (vlc_object_t *);
47 pf_find_input = var_GetAddress (obj, "find-input-callback");
48 if (unlikely(pf_find_input == NULL))
51 input_thread_t *p_input = pf_find_input (obj);
55 aout_instance_t *p_aout = input_GetAout (p_input);
56 vlc_object_release (p_input);
59 #define findAout(o) findAout(VLC_OBJECT(o))
61 /** Start a volume change transaction. */
62 static void prepareVolume (vlc_object_t *obj, aout_instance_t **aoutp,
63 audio_volume_t *volp, bool *mutep)
65 aout_instance_t *aout = findAout (obj);
67 /* FIXME: we need interlocking even if aout does not exist! */
70 aout_lock_volume (aout);
72 *volp = var_GetInteger (obj, "volume");
74 *mutep = var_GetBool (obj, "mute");
77 /** Commit a volume change transaction. */
78 static int commitVolume (vlc_object_t *obj, aout_instance_t *aout,
79 audio_volume_t volume, bool mute)
83 var_SetInteger (obj, "volume", volume);
84 var_SetBool (obj, "mute", mute);
88 aout_lock_mixer (aout);
89 aout_lock_input_fifos (aout);
90 if (aout->p_mixer != NULL)
91 ret = aout->output.pf_volume_set (aout, volume, mute);
92 aout_unlock_input_fifos (aout);
93 aout_unlock_mixer (aout);
96 var_TriggerCallback (aout, "intf-change");
97 aout_unlock_volume (aout);
98 vlc_object_release (aout);
104 /** Cancel a volume change transaction. */
105 static void cancelVolume (vlc_object_t *obj, aout_instance_t *aout)
110 aout_unlock_volume (aout);
111 vlc_object_release (aout);
116 #undef aout_VolumeGet
118 * Gets the volume of the output device (independent of mute).
120 audio_volume_t aout_VolumeGet (vlc_object_t *obj)
123 aout_instance_t *aout;
124 audio_volume_t volume;
126 prepareVolume (obj, &aout, &volume, NULL);
127 cancelVolume (obj, aout);
130 return var_GetInteger (obj, "volume");
134 #undef aout_VolumeSet
136 * Sets the volume of the output device.
137 * The mute status is not changed.
139 int aout_VolumeSet (vlc_object_t *obj, audio_volume_t volume)
141 aout_instance_t *aout;
144 prepareVolume (obj, &aout, NULL, &mute);
145 return commitVolume (obj, aout, volume, mute);
151 * \param value how much to increase (> 0) or decrease (< 0) the volume
152 * \param volp if non-NULL, will contain contain the resulting volume
154 int aout_VolumeUp (vlc_object_t *obj, int value, audio_volume_t *volp)
156 aout_instance_t *aout;
158 audio_volume_t volume;
161 value *= var_InheritInteger (obj, "volume-step");
163 prepareVolume (obj, &aout, &volume, &mute);
165 if (value < AOUT_VOLUME_MIN)
166 volume = AOUT_VOLUME_MIN;
168 if (value > AOUT_VOLUME_MAX)
169 volume = AOUT_VOLUME_MAX;
172 ret = commitVolume (obj, aout, volume, mute);
178 #undef aout_VolumeDown
180 * Lowers the volume. See aout_VolumeUp().
182 int aout_VolumeDown (vlc_object_t *obj, int steps, audio_volume_t *volp)
184 return aout_VolumeUp (obj, -steps, volp);
187 #undef aout_ToggleMute
189 * Toggles the mute state.
191 int aout_ToggleMute (vlc_object_t *obj, audio_volume_t *volp)
193 aout_instance_t *aout;
195 audio_volume_t volume;
198 prepareVolume (obj, &aout, &volume, &mute);
200 ret = commitVolume (obj, aout, volume, mute);
202 *volp = mute ? AOUT_VOLUME_MIN : volume;
207 * Gets the output mute status.
209 bool aout_IsMuted (vlc_object_t *obj)
212 aout_instance_t *aout;
215 prepareVolume (obj, &aout, NULL, &mute);
216 cancelVolume (obj, aout);
219 return var_GetBool (obj, "mute");
226 int aout_SetMute (vlc_object_t *obj, audio_volume_t *volp, bool mute)
228 aout_instance_t *aout;
230 audio_volume_t volume;
232 prepareVolume (obj, &aout, &volume, NULL);
233 ret = commitVolume (obj, aout, volume, mute);
235 *volp = mute ? AOUT_VOLUME_MIN : volume;
241 * The next functions are not supposed to be called by the interface, but
242 * are placeholders for software-only scaling.
244 static int aout_VolumeSoftSet (aout_instance_t *aout, audio_volume_t volume,
247 float f = mute ? 0. : (volume / (float)AOUT_VOLUME_DEFAULT);
248 aout->mixer_multiplier = f;
252 /* Meant to be called by the output plug-in's Open(). */
253 void aout_VolumeSoftInit (aout_instance_t *aout)
255 audio_volume_t volume = var_InheritInteger (aout, "volume");
256 bool mute = var_InheritBool (aout, "mute");
258 aout->output.pf_volume_set = aout_VolumeSoftSet;
259 aout_VolumeSoftSet (aout, volume, mute);
264 * The next functions are not supposed to be called by the interface, but
265 * are placeholders for unsupported scaling.
267 static int aout_VolumeNoneSet (aout_instance_t *aout, audio_volume_t volume,
270 (void)aout; (void)volume; (void)mute;
274 /* Meant to be called by the output plug-in's Open(). */
275 void aout_VolumeNoneInit( aout_instance_t * p_aout )
277 p_aout->output.pf_volume_set = aout_VolumeNoneSet;
282 * Pipelines management
285 /*****************************************************************************
286 * aout_Restart : re-open the output device and rebuild the input and output
288 *****************************************************************************
289 * This function is used whenever the parameters of the output plug-in are
290 * changed (eg. selecting S/PDIF or PCM).
291 *****************************************************************************/
292 static int aout_Restart( aout_instance_t * p_aout )
297 aout_lock_mixer( p_aout );
299 if ( p_aout->i_nb_inputs == 0 )
301 aout_unlock_mixer( p_aout );
302 msg_Err( p_aout, "no decoder thread" );
306 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
308 aout_lock_input( p_aout, p_aout->pp_inputs[i] );
309 aout_lock_input_fifos( p_aout );
310 aout_InputDelete( p_aout, p_aout->pp_inputs[i] );
311 aout_unlock_input_fifos( p_aout );
314 /* Lock all inputs. */
315 aout_lock_input_fifos( p_aout );
316 aout_MixerDelete( p_aout );
318 /* Re-open the output plug-in. */
319 aout_OutputDelete( p_aout );
321 /* FIXME: This function is notoriously dangerous/unsafe.
322 * By the way, if OutputNew or MixerNew fails, we are totally screwed. */
323 if ( aout_OutputNew( p_aout, &p_aout->pp_inputs[0]->input ) == -1 )
325 /* Release all locks and report the error. */
326 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
328 vlc_mutex_unlock( &p_aout->pp_inputs[i]->lock );
330 aout_unlock_input_fifos( p_aout );
331 aout_unlock_mixer( p_aout );
335 if ( aout_MixerNew( p_aout ) == -1 )
337 aout_OutputDelete( p_aout );
338 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
340 vlc_mutex_unlock( &p_aout->pp_inputs[i]->lock );
342 aout_unlock_input_fifos( p_aout );
343 aout_unlock_mixer( p_aout );
347 /* Re-open all inputs. */
348 for ( i = 0; i < p_aout->i_nb_inputs; i++ )
350 aout_input_t * p_input = p_aout->pp_inputs[i];
351 b_error |= aout_InputNew( p_aout, p_input, &p_input->request_vout );
352 aout_unlock_input( p_aout, p_input );
355 aout_unlock_input_fifos( p_aout );
356 aout_unlock_mixer( p_aout );
361 /*****************************************************************************
362 * aout_ChannelsRestart : change the audio device or channels and restart
363 *****************************************************************************/
364 int aout_ChannelsRestart( vlc_object_t * p_this, const char * psz_variable,
365 vlc_value_t oldval, vlc_value_t newval,
368 aout_instance_t * p_aout = (aout_instance_t *)p_this;
369 (void)oldval; (void)newval; (void)p_data;
371 if ( !strcmp( psz_variable, "audio-device" ) )
373 /* This is supposed to be a significant change and supposes
374 * rebuilding the channel choices. */
375 var_Destroy( p_aout, "audio-channels" );
377 aout_Restart( p_aout );
381 #undef aout_EnableFilter
382 /** Enable or disable an audio filter
383 * \param p_this a vlc object
384 * \param psz_name name of the filter
385 * \param b_add are we adding or removing the filter ?
387 void aout_EnableFilter( vlc_object_t *p_this, const char *psz_name,
390 aout_instance_t *p_aout = findAout( p_this );
392 if( aout_ChangeFilterString( p_this, p_aout, "audio-filter", psz_name, b_add ) )
395 AoutInputsMarkToRestart( p_aout );
399 vlc_object_release( p_aout );