2 This file is part of PulseAudio.
4 Copyright 2004-2006 Lennart Poettering
6 PulseAudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 2.1 of the License,
9 or (at your option) any later version.
11 PulseAudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with PulseAudio; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
29 #include <pulse/i18n.h>
31 #include <pulsecore/core-util.h>
32 #include <pulsecore/macro.h>
33 #include <pulsecore/sample-util.h>
37 int pa_cvolume_equal(const pa_cvolume
*a
, const pa_cvolume
*b
) {
42 pa_return_val_if_fail(pa_cvolume_valid(a
), 0);
44 if (PA_UNLIKELY(a
== b
))
47 pa_return_val_if_fail(pa_cvolume_valid(b
), 0);
49 if (a
->channels
!= b
->channels
)
52 for (i
= 0; i
< a
->channels
; i
++)
53 if (a
->values
[i
] != b
->values
[i
])
59 pa_cvolume
* pa_cvolume_init(pa_cvolume
*a
) {
66 for (c
= 0; c
< PA_CHANNELS_MAX
; c
++)
67 a
->values
[c
] = PA_VOLUME_INVALID
;
72 pa_cvolume
* pa_cvolume_set(pa_cvolume
*a
, unsigned channels
, pa_volume_t v
) {
76 pa_assert(channels
> 0);
77 pa_assert(channels
<= PA_CHANNELS_MAX
);
79 a
->channels
= (uint8_t) channels
;
81 for (i
= 0; i
< a
->channels
; i
++)
82 /* Clamp in case there is stale data that exceeds the current
84 a
->values
[i
] = PA_CLAMP_VOLUME(v
);
89 pa_volume_t
pa_cvolume_avg(const pa_cvolume
*a
) {
94 pa_return_val_if_fail(pa_cvolume_valid(a
), PA_VOLUME_MUTED
);
96 for (c
= 0; c
< a
->channels
; c
++)
101 return (pa_volume_t
) sum
;
104 pa_volume_t
pa_cvolume_avg_mask(const pa_cvolume
*a
, const pa_channel_map
*cm
, pa_channel_position_mask_t mask
) {
111 return pa_cvolume_avg(a
);
113 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(a
, cm
), PA_VOLUME_MUTED
);
115 for (c
= n
= 0; c
< a
->channels
; c
++) {
117 if (!(PA_CHANNEL_POSITION_MASK(cm
->map
[c
]) & mask
))
127 return (pa_volume_t
) sum
;
130 pa_volume_t
pa_cvolume_max(const pa_cvolume
*a
) {
131 pa_volume_t m
= PA_VOLUME_MUTED
;
135 pa_return_val_if_fail(pa_cvolume_valid(a
), PA_VOLUME_MUTED
);
137 for (c
= 0; c
< a
->channels
; c
++)
138 if (a
->values
[c
] > m
)
144 pa_volume_t
pa_cvolume_min(const pa_cvolume
*a
) {
145 pa_volume_t m
= PA_VOLUME_MAX
;
149 pa_return_val_if_fail(pa_cvolume_valid(a
), PA_VOLUME_MUTED
);
151 for (c
= 0; c
< a
->channels
; c
++)
152 if (a
->values
[c
] < m
)
158 pa_volume_t
pa_cvolume_max_mask(const pa_cvolume
*a
, const pa_channel_map
*cm
, pa_channel_position_mask_t mask
) {
159 pa_volume_t m
= PA_VOLUME_MUTED
;
165 return pa_cvolume_max(a
);
167 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(a
, cm
), PA_VOLUME_MUTED
);
169 for (c
= 0; c
< a
->channels
; c
++) {
171 if (!(PA_CHANNEL_POSITION_MASK(cm
->map
[c
]) & mask
))
174 if (a
->values
[c
] > m
)
181 pa_volume_t
pa_cvolume_min_mask(const pa_cvolume
*a
, const pa_channel_map
*cm
, pa_channel_position_mask_t mask
) {
182 pa_volume_t m
= PA_VOLUME_MAX
;
188 return pa_cvolume_min(a
);
190 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(a
, cm
), PA_VOLUME_MUTED
);
192 for (c
= 0; c
< a
->channels
; c
++) {
194 if (!(PA_CHANNEL_POSITION_MASK(cm
->map
[c
]) & mask
))
197 if (a
->values
[c
] < m
)
204 pa_volume_t
pa_sw_volume_multiply(pa_volume_t a
, pa_volume_t b
) {
206 pa_return_val_if_fail(PA_VOLUME_IS_VALID(a
), PA_VOLUME_INVALID
);
207 pa_return_val_if_fail(PA_VOLUME_IS_VALID(b
), PA_VOLUME_INVALID
);
209 /* cbrt((a/PA_VOLUME_NORM)^3*(b/PA_VOLUME_NORM)^3)*PA_VOLUME_NORM = a*b/PA_VOLUME_NORM */
211 return (pa_volume_t
) PA_CLAMP_VOLUME((((uint64_t) a
* (uint64_t) b
+ (uint64_t) PA_VOLUME_NORM
/ 2ULL) / (uint64_t) PA_VOLUME_NORM
));
214 pa_volume_t
pa_sw_volume_divide(pa_volume_t a
, pa_volume_t b
) {
216 pa_return_val_if_fail(PA_VOLUME_IS_VALID(a
), PA_VOLUME_INVALID
);
217 pa_return_val_if_fail(PA_VOLUME_IS_VALID(b
), PA_VOLUME_INVALID
);
219 if (b
<= PA_VOLUME_MUTED
)
222 return (pa_volume_t
) (((uint64_t) a
* (uint64_t) PA_VOLUME_NORM
+ (uint64_t) b
/ 2ULL) / (uint64_t) b
);
225 /* Amplitude, not power */
226 static double linear_to_dB(double v
) {
227 return 20.0 * log10(v
);
230 static double dB_to_linear(double v
) {
231 return pow(10.0, v
/ 20.0);
234 pa_volume_t
pa_sw_volume_from_dB(double dB
) {
235 if (isinf(dB
) < 0 || dB
<= PA_DECIBEL_MININFTY
)
236 return PA_VOLUME_MUTED
;
238 return pa_sw_volume_from_linear(dB_to_linear(dB
));
241 double pa_sw_volume_to_dB(pa_volume_t v
) {
243 pa_return_val_if_fail(PA_VOLUME_IS_VALID(v
), PA_DECIBEL_MININFTY
);
245 if (v
<= PA_VOLUME_MUTED
)
246 return PA_DECIBEL_MININFTY
;
248 return linear_to_dB(pa_sw_volume_to_linear(v
));
251 pa_volume_t
pa_sw_volume_from_linear(double v
) {
254 return PA_VOLUME_MUTED
;
257 * We use a cubic mapping here, as suggested and discussed here:
259 * http://www.robotplanet.dk/audio/audio_gui_design/
260 * http://lists.linuxaudio.org/pipermail/linux-audio-dev/2009-May/thread.html#23151
262 * We make sure that the conversion to linear and back yields the
263 * same volume value! That's why we need the lround() below!
266 return (pa_volume_t
) PA_CLAMP_VOLUME(lround(cbrt(v
) * PA_VOLUME_NORM
));
269 double pa_sw_volume_to_linear(pa_volume_t v
) {
272 pa_return_val_if_fail(PA_VOLUME_IS_VALID(v
), 0.0);
274 if (v
<= PA_VOLUME_MUTED
)
277 if (v
== PA_VOLUME_NORM
)
280 f
= ((double) v
/ PA_VOLUME_NORM
);
285 char *pa_cvolume_snprint(char *s
, size_t l
, const pa_cvolume
*c
) {
287 pa_bool_t first
= TRUE
;
296 if (!pa_cvolume_valid(c
)) {
297 pa_snprintf(s
, l
, _("(invalid)"));
303 for (channel
= 0; channel
< c
->channels
&& l
> 1; channel
++) {
304 l
-= pa_snprintf(e
, l
, "%s%u: %3u%%",
307 (c
->values
[channel
]*100+PA_VOLUME_NORM
/2)/PA_VOLUME_NORM
);
316 char *pa_volume_snprint(char *s
, size_t l
, pa_volume_t v
) {
322 if (!PA_VOLUME_IS_VALID(v
)) {
323 pa_snprintf(s
, l
, _("(invalid)"));
327 pa_snprintf(s
, l
, "%3u%%", (v
*100+PA_VOLUME_NORM
/2)/PA_VOLUME_NORM
);
331 char *pa_sw_cvolume_snprint_dB(char *s
, size_t l
, const pa_cvolume
*c
) {
333 pa_bool_t first
= TRUE
;
342 if (!pa_cvolume_valid(c
)) {
343 pa_snprintf(s
, l
, _("(invalid)"));
349 for (channel
= 0; channel
< c
->channels
&& l
> 1; channel
++) {
350 double f
= pa_sw_volume_to_dB(c
->values
[channel
]);
352 l
-= pa_snprintf(e
, l
, "%s%u: %0.2f dB",
355 isinf(f
) < 0 || f
<= PA_DECIBEL_MININFTY
? -INFINITY
: f
);
364 char *pa_sw_volume_snprint_dB(char *s
, size_t l
, pa_volume_t v
) {
372 if (!PA_VOLUME_IS_VALID(v
)) {
373 pa_snprintf(s
, l
, _("(invalid)"));
377 f
= pa_sw_volume_to_dB(v
);
378 pa_snprintf(s
, l
, "%0.2f dB",
379 isinf(f
) < 0 || f
<= PA_DECIBEL_MININFTY
? -INFINITY
: f
);
384 int pa_cvolume_channels_equal_to(const pa_cvolume
*a
, pa_volume_t v
) {
388 pa_return_val_if_fail(pa_cvolume_valid(a
), 0);
389 pa_return_val_if_fail(PA_VOLUME_IS_VALID(v
), 0);
391 for (c
= 0; c
< a
->channels
; c
++)
392 if (a
->values
[c
] != v
)
398 pa_cvolume
*pa_sw_cvolume_multiply(pa_cvolume
*dest
, const pa_cvolume
*a
, const pa_cvolume
*b
) {
405 pa_return_val_if_fail(pa_cvolume_valid(a
), NULL
);
406 pa_return_val_if_fail(pa_cvolume_valid(b
), NULL
);
408 for (i
= 0; i
< a
->channels
&& i
< b
->channels
; i
++)
409 dest
->values
[i
] = pa_sw_volume_multiply(a
->values
[i
], b
->values
[i
]);
411 dest
->channels
= (uint8_t) i
;
416 pa_cvolume
*pa_sw_cvolume_multiply_scalar(pa_cvolume
*dest
, const pa_cvolume
*a
, pa_volume_t b
) {
422 pa_return_val_if_fail(pa_cvolume_valid(a
), NULL
);
423 pa_return_val_if_fail(PA_VOLUME_IS_VALID(b
), NULL
);
425 for (i
= 0; i
< a
->channels
; i
++)
426 dest
->values
[i
] = pa_sw_volume_multiply(a
->values
[i
], b
);
428 dest
->channels
= (uint8_t) i
;
433 pa_cvolume
*pa_sw_cvolume_divide(pa_cvolume
*dest
, const pa_cvolume
*a
, const pa_cvolume
*b
) {
440 pa_return_val_if_fail(pa_cvolume_valid(a
), NULL
);
441 pa_return_val_if_fail(pa_cvolume_valid(b
), NULL
);
443 for (i
= 0; i
< a
->channels
&& i
< b
->channels
; i
++)
444 dest
->values
[i
] = pa_sw_volume_divide(a
->values
[i
], b
->values
[i
]);
446 dest
->channels
= (uint8_t) i
;
451 pa_cvolume
*pa_sw_cvolume_divide_scalar(pa_cvolume
*dest
, const pa_cvolume
*a
, pa_volume_t b
) {
457 pa_return_val_if_fail(pa_cvolume_valid(a
), NULL
);
458 pa_return_val_if_fail(PA_VOLUME_IS_VALID(b
), NULL
);
460 for (i
= 0; i
< a
->channels
; i
++)
461 dest
->values
[i
] = pa_sw_volume_divide(a
->values
[i
], b
);
463 dest
->channels
= (uint8_t) i
;
468 int pa_cvolume_valid(const pa_cvolume
*v
) {
473 if (v
->channels
<= 0 || v
->channels
> PA_CHANNELS_MAX
)
476 for (c
= 0; c
< v
->channels
; c
++)
477 if (!PA_VOLUME_IS_VALID(v
->values
[c
]))
483 static pa_bool_t
on_left(pa_channel_position_t p
) {
484 return !!(PA_CHANNEL_POSITION_MASK(p
) & PA_CHANNEL_POSITION_MASK_LEFT
);
487 static pa_bool_t
on_right(pa_channel_position_t p
) {
488 return !!(PA_CHANNEL_POSITION_MASK(p
) & PA_CHANNEL_POSITION_MASK_RIGHT
);
491 static pa_bool_t
on_center(pa_channel_position_t p
) {
492 return !!(PA_CHANNEL_POSITION_MASK(p
) & PA_CHANNEL_POSITION_MASK_CENTER
);
495 static pa_bool_t
on_lfe(pa_channel_position_t p
) {
496 return p
== PA_CHANNEL_POSITION_LFE
;
499 static pa_bool_t
on_front(pa_channel_position_t p
) {
500 return !!(PA_CHANNEL_POSITION_MASK(p
) & PA_CHANNEL_POSITION_MASK_FRONT
);
503 static pa_bool_t
on_rear(pa_channel_position_t p
) {
504 return !!(PA_CHANNEL_POSITION_MASK(p
) & PA_CHANNEL_POSITION_MASK_REAR
);
507 pa_cvolume
*pa_cvolume_remap(pa_cvolume
*v
, const pa_channel_map
*from
, const pa_channel_map
*to
) {
515 pa_return_val_if_fail(pa_channel_map_valid(to
), NULL
);
516 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v
, from
), NULL
);
518 if (pa_channel_map_equal(from
, to
))
521 result
.channels
= to
->channels
;
523 for (b
= 0; b
< to
->channels
; b
++) {
527 for (a
= 0; a
< from
->channels
; a
++)
528 if (from
->map
[a
] == to
->map
[b
]) {
534 for (a
= 0; a
< from
->channels
; a
++)
535 if ((on_left(from
->map
[a
]) && on_left(to
->map
[b
])) ||
536 (on_right(from
->map
[a
]) && on_right(to
->map
[b
])) ||
537 (on_center(from
->map
[a
]) && on_center(to
->map
[b
])) ||
538 (on_lfe(from
->map
[a
]) && on_lfe(to
->map
[b
]))) {
546 k
= pa_cvolume_avg(v
);
550 result
.values
[b
] = k
;
557 int pa_cvolume_compatible(const pa_cvolume
*v
, const pa_sample_spec
*ss
) {
562 pa_return_val_if_fail(pa_cvolume_valid(v
), 0);
563 pa_return_val_if_fail(pa_sample_spec_valid(ss
), 0);
565 return v
->channels
== ss
->channels
;
568 int pa_cvolume_compatible_with_channel_map(const pa_cvolume
*v
, const pa_channel_map
*cm
) {
572 pa_return_val_if_fail(pa_cvolume_valid(v
), 0);
573 pa_return_val_if_fail(pa_channel_map_valid(cm
), 0);
575 return v
->channels
== cm
->channels
;
578 static void get_avg_lr(const pa_channel_map
*map
, const pa_cvolume
*v
, pa_volume_t
*l
, pa_volume_t
*r
) {
580 pa_volume_t left
= 0, right
= 0;
581 unsigned n_left
= 0, n_right
= 0;
585 pa_assert(map
->channels
== v
->channels
);
589 for (c
= 0; c
< map
->channels
; c
++) {
590 if (on_left(map
->map
[c
])) {
591 left
+= v
->values
[c
];
593 } else if (on_right(map
->map
[c
])) {
594 right
+= v
->values
[c
];
607 *r
= right
/ n_right
;
610 float pa_cvolume_get_balance(const pa_cvolume
*v
, const pa_channel_map
*map
) {
611 pa_volume_t left
, right
;
616 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v
, map
), 0.0f
);
618 if (!pa_channel_map_can_balance(map
))
621 get_avg_lr(map
, v
, &left
, &right
);
636 return -1.0f
+ ((float) right
/ (float) left
);
638 return 1.0f
- ((float) left
/ (float) right
);
641 pa_cvolume
* pa_cvolume_set_balance(pa_cvolume
*v
, const pa_channel_map
*map
, float new_balance
) {
642 pa_volume_t left
, nleft
, right
, nright
, m
;
648 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v
, map
), NULL
);
649 pa_return_val_if_fail(new_balance
>= -1.0f
, NULL
);
650 pa_return_val_if_fail(new_balance
<= 1.0f
, NULL
);
652 if (!pa_channel_map_can_balance(map
))
655 get_avg_lr(map
, v
, &left
, &right
);
657 m
= PA_MAX(left
, right
);
659 if (new_balance
<= 0) {
660 nright
= (new_balance
+ 1.0f
) * m
;
663 nleft
= (1.0f
- new_balance
) * m
;
667 for (c
= 0; c
< map
->channels
; c
++) {
668 if (on_left(map
->map
[c
])) {
670 v
->values
[c
] = nleft
;
672 v
->values
[c
] = (pa_volume_t
) PA_CLAMP_VOLUME(((uint64_t) v
->values
[c
] * (uint64_t) nleft
) / (uint64_t) left
);
673 } else if (on_right(map
->map
[c
])) {
675 v
->values
[c
] = nright
;
677 v
->values
[c
] = (pa_volume_t
) PA_CLAMP_VOLUME(((uint64_t) v
->values
[c
] * (uint64_t) nright
) / (uint64_t) right
);
684 pa_cvolume
* pa_cvolume_scale(pa_cvolume
*v
, pa_volume_t max
) {
690 pa_return_val_if_fail(pa_cvolume_valid(v
), NULL
);
691 pa_return_val_if_fail(PA_VOLUME_IS_VALID(max
), NULL
);
693 t
= pa_cvolume_max(v
);
695 if (t
<= PA_VOLUME_MUTED
)
696 return pa_cvolume_set(v
, v
->channels
, max
);
698 for (c
= 0; c
< v
->channels
; c
++)
699 v
->values
[c
] = (pa_volume_t
) PA_CLAMP_VOLUME(((uint64_t) v
->values
[c
] * (uint64_t) max
) / (uint64_t) t
);
704 pa_cvolume
* pa_cvolume_scale_mask(pa_cvolume
*v
, pa_volume_t max
, pa_channel_map
*cm
, pa_channel_position_mask_t mask
) {
710 pa_return_val_if_fail(PA_VOLUME_IS_VALID(max
), NULL
);
713 return pa_cvolume_scale(v
, max
);
715 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v
, cm
), NULL
);
717 t
= pa_cvolume_max_mask(v
, cm
, mask
);
719 if (t
<= PA_VOLUME_MUTED
)
720 return pa_cvolume_set(v
, v
->channels
, max
);
722 for (c
= 0; c
< v
->channels
; c
++)
723 v
->values
[c
] = (pa_volume_t
) PA_CLAMP_VOLUME(((uint64_t) v
->values
[c
] * (uint64_t) max
) / (uint64_t) t
);
728 static void get_avg_fr(const pa_channel_map
*map
, const pa_cvolume
*v
, pa_volume_t
*f
, pa_volume_t
*r
) {
730 pa_volume_t front
= 0, rear
= 0;
731 unsigned n_front
= 0, n_rear
= 0;
735 pa_assert(map
->channels
== v
->channels
);
739 for (c
= 0; c
< map
->channels
; c
++) {
740 if (on_front(map
->map
[c
])) {
741 front
+= v
->values
[c
];
743 } else if (on_rear(map
->map
[c
])) {
744 rear
+= v
->values
[c
];
752 *f
= front
/ n_front
;
760 float pa_cvolume_get_fade(const pa_cvolume
*v
, const pa_channel_map
*map
) {
761 pa_volume_t front
, rear
;
766 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v
, map
), 0.0f
);
768 if (!pa_channel_map_can_fade(map
))
771 get_avg_fr(map
, v
, &front
, &rear
);
777 return -1.0f
+ ((float) front
/ (float) rear
);
779 return 1.0f
- ((float) rear
/ (float) front
);
782 pa_cvolume
* pa_cvolume_set_fade(pa_cvolume
*v
, const pa_channel_map
*map
, float new_fade
) {
783 pa_volume_t front
, nfront
, rear
, nrear
, m
;
789 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v
, map
), NULL
);
790 pa_return_val_if_fail(new_fade
>= -1.0f
, NULL
);
791 pa_return_val_if_fail(new_fade
<= 1.0f
, NULL
);
793 if (!pa_channel_map_can_fade(map
))
796 get_avg_fr(map
, v
, &front
, &rear
);
798 m
= PA_MAX(front
, rear
);
801 nfront
= (new_fade
+ 1.0f
) * m
;
804 nrear
= (1.0f
- new_fade
) * m
;
808 for (c
= 0; c
< map
->channels
; c
++) {
809 if (on_front(map
->map
[c
])) {
811 v
->values
[c
] = nfront
;
813 v
->values
[c
] = (pa_volume_t
) PA_CLAMP_VOLUME(((uint64_t) v
->values
[c
] * (uint64_t) nfront
) / (uint64_t) front
);
814 } else if (on_rear(map
->map
[c
])) {
816 v
->values
[c
] = nrear
;
818 v
->values
[c
] = (pa_volume_t
) PA_CLAMP_VOLUME(((uint64_t) v
->values
[c
] * (uint64_t) nrear
) / (uint64_t) rear
);
825 pa_cvolume
* pa_cvolume_set_position(
827 const pa_channel_map
*map
,
828 pa_channel_position_t t
,
832 pa_bool_t good
= FALSE
;
837 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(cv
, map
), NULL
);
838 pa_return_val_if_fail(t
< PA_CHANNEL_POSITION_MAX
, NULL
);
839 pa_return_val_if_fail(PA_VOLUME_IS_VALID(v
), NULL
);
841 for (c
= 0; c
< map
->channels
; c
++)
842 if (map
->map
[c
] == t
) {
847 return good
? cv
: NULL
;
850 pa_volume_t
pa_cvolume_get_position(
852 const pa_channel_map
*map
,
853 pa_channel_position_t t
) {
856 pa_volume_t v
= PA_VOLUME_MUTED
;
861 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(cv
, map
), PA_VOLUME_MUTED
);
862 pa_return_val_if_fail(t
< PA_CHANNEL_POSITION_MAX
, PA_VOLUME_MUTED
);
864 for (c
= 0; c
< map
->channels
; c
++)
865 if (map
->map
[c
] == t
)
866 if (cv
->values
[c
] > v
)
872 pa_cvolume
* pa_cvolume_merge(pa_cvolume
*dest
, const pa_cvolume
*a
, const pa_cvolume
*b
) {
879 pa_return_val_if_fail(pa_cvolume_valid(a
), NULL
);
880 pa_return_val_if_fail(pa_cvolume_valid(b
), NULL
);
882 for (i
= 0; i
< a
->channels
&& i
< b
->channels
; i
++)
883 dest
->values
[i
] = PA_MAX(a
->values
[i
], b
->values
[i
]);
885 dest
->channels
= (uint8_t) i
;
890 pa_cvolume
* pa_cvolume_inc_clamp(pa_cvolume
*v
, pa_volume_t inc
, pa_volume_t limit
) {
895 pa_return_val_if_fail(pa_cvolume_valid(v
), NULL
);
896 pa_return_val_if_fail(PA_VOLUME_IS_VALID(inc
), NULL
);
898 m
= pa_cvolume_max(v
);
900 if (m
>= limit
- inc
)
905 return pa_cvolume_scale(v
, m
);
908 pa_cvolume
* pa_cvolume_inc(pa_cvolume
*v
, pa_volume_t inc
){
909 return pa_cvolume_inc_clamp(v
, inc
, PA_VOLUME_MAX
);
912 pa_cvolume
* pa_cvolume_dec(pa_cvolume
*v
, pa_volume_t dec
) {
917 pa_return_val_if_fail(pa_cvolume_valid(v
), NULL
);
918 pa_return_val_if_fail(PA_VOLUME_IS_VALID(dec
), NULL
);
920 m
= pa_cvolume_max(v
);
922 if (m
<= PA_VOLUME_MUTED
+ dec
)
927 return pa_cvolume_scale(v
, m
);