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
30 #include <pulsecore/core-util.h>
31 #include <pulsecore/i18n.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((uint64_t) 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", isinf(f
) < 0 || f
<= PA_DECIBEL_MININFTY
? -INFINITY
: f
);
383 int pa_cvolume_channels_equal_to(const pa_cvolume
*a
, pa_volume_t v
) {
387 pa_return_val_if_fail(pa_cvolume_valid(a
), 0);
388 pa_return_val_if_fail(PA_VOLUME_IS_VALID(v
), 0);
390 for (c
= 0; c
< a
->channels
; c
++)
391 if (a
->values
[c
] != v
)
397 pa_cvolume
*pa_sw_cvolume_multiply(pa_cvolume
*dest
, const pa_cvolume
*a
, const pa_cvolume
*b
) {
404 pa_return_val_if_fail(pa_cvolume_valid(a
), NULL
);
405 pa_return_val_if_fail(pa_cvolume_valid(b
), NULL
);
407 for (i
= 0; i
< a
->channels
&& i
< b
->channels
; i
++)
408 dest
->values
[i
] = pa_sw_volume_multiply(a
->values
[i
], b
->values
[i
]);
410 dest
->channels
= (uint8_t) i
;
415 pa_cvolume
*pa_sw_cvolume_multiply_scalar(pa_cvolume
*dest
, const pa_cvolume
*a
, pa_volume_t b
) {
421 pa_return_val_if_fail(pa_cvolume_valid(a
), NULL
);
422 pa_return_val_if_fail(PA_VOLUME_IS_VALID(b
), NULL
);
424 for (i
= 0; i
< a
->channels
; i
++)
425 dest
->values
[i
] = pa_sw_volume_multiply(a
->values
[i
], b
);
427 dest
->channels
= (uint8_t) i
;
432 pa_cvolume
*pa_sw_cvolume_divide(pa_cvolume
*dest
, const pa_cvolume
*a
, const pa_cvolume
*b
) {
439 pa_return_val_if_fail(pa_cvolume_valid(a
), NULL
);
440 pa_return_val_if_fail(pa_cvolume_valid(b
), NULL
);
442 for (i
= 0; i
< a
->channels
&& i
< b
->channels
; i
++)
443 dest
->values
[i
] = pa_sw_volume_divide(a
->values
[i
], b
->values
[i
]);
445 dest
->channels
= (uint8_t) i
;
450 pa_cvolume
*pa_sw_cvolume_divide_scalar(pa_cvolume
*dest
, const pa_cvolume
*a
, pa_volume_t b
) {
456 pa_return_val_if_fail(pa_cvolume_valid(a
), NULL
);
457 pa_return_val_if_fail(PA_VOLUME_IS_VALID(b
), NULL
);
459 for (i
= 0; i
< a
->channels
; i
++)
460 dest
->values
[i
] = pa_sw_volume_divide(a
->values
[i
], b
);
462 dest
->channels
= (uint8_t) i
;
467 int pa_cvolume_valid(const pa_cvolume
*v
) {
472 if (v
->channels
<= 0 || v
->channels
> PA_CHANNELS_MAX
)
475 for (c
= 0; c
< v
->channels
; c
++)
476 if (!PA_VOLUME_IS_VALID(v
->values
[c
]))
482 static pa_bool_t
on_left(pa_channel_position_t p
) {
483 return !!(PA_CHANNEL_POSITION_MASK(p
) & PA_CHANNEL_POSITION_MASK_LEFT
);
486 static pa_bool_t
on_right(pa_channel_position_t p
) {
487 return !!(PA_CHANNEL_POSITION_MASK(p
) & PA_CHANNEL_POSITION_MASK_RIGHT
);
490 static pa_bool_t
on_center(pa_channel_position_t p
) {
491 return !!(PA_CHANNEL_POSITION_MASK(p
) & PA_CHANNEL_POSITION_MASK_CENTER
);
494 static pa_bool_t
on_lfe(pa_channel_position_t p
) {
495 return p
== PA_CHANNEL_POSITION_LFE
;
498 static pa_bool_t
on_front(pa_channel_position_t p
) {
499 return !!(PA_CHANNEL_POSITION_MASK(p
) & PA_CHANNEL_POSITION_MASK_FRONT
);
502 static pa_bool_t
on_rear(pa_channel_position_t p
) {
503 return !!(PA_CHANNEL_POSITION_MASK(p
) & PA_CHANNEL_POSITION_MASK_REAR
);
506 pa_cvolume
*pa_cvolume_remap(pa_cvolume
*v
, const pa_channel_map
*from
, const pa_channel_map
*to
) {
514 pa_return_val_if_fail(pa_channel_map_valid(to
), NULL
);
515 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v
, from
), NULL
);
517 if (pa_channel_map_equal(from
, to
))
520 result
.channels
= to
->channels
;
522 for (b
= 0; b
< to
->channels
; b
++) {
526 for (a
= 0; a
< from
->channels
; a
++)
527 if (from
->map
[a
] == to
->map
[b
]) {
533 for (a
= 0; a
< from
->channels
; a
++)
534 if ((on_left(from
->map
[a
]) && on_left(to
->map
[b
])) ||
535 (on_right(from
->map
[a
]) && on_right(to
->map
[b
])) ||
536 (on_center(from
->map
[a
]) && on_center(to
->map
[b
])) ||
537 (on_lfe(from
->map
[a
]) && on_lfe(to
->map
[b
]))) {
545 k
= pa_cvolume_avg(v
);
549 result
.values
[b
] = k
;
556 int pa_cvolume_compatible(const pa_cvolume
*v
, const pa_sample_spec
*ss
) {
561 pa_return_val_if_fail(pa_cvolume_valid(v
), 0);
562 pa_return_val_if_fail(pa_sample_spec_valid(ss
), 0);
564 return v
->channels
== ss
->channels
;
567 int pa_cvolume_compatible_with_channel_map(const pa_cvolume
*v
, const pa_channel_map
*cm
) {
571 pa_return_val_if_fail(pa_cvolume_valid(v
), 0);
572 pa_return_val_if_fail(pa_channel_map_valid(cm
), 0);
574 return v
->channels
== cm
->channels
;
577 static void get_avg_lr(const pa_channel_map
*map
, const pa_cvolume
*v
, pa_volume_t
*l
, pa_volume_t
*r
) {
579 pa_volume_t left
= 0, right
= 0;
580 unsigned n_left
= 0, n_right
= 0;
584 pa_assert(map
->channels
== v
->channels
);
588 for (c
= 0; c
< map
->channels
; c
++) {
589 if (on_left(map
->map
[c
])) {
590 left
+= v
->values
[c
];
592 } else if (on_right(map
->map
[c
])) {
593 right
+= v
->values
[c
];
606 *r
= right
/ n_right
;
609 float pa_cvolume_get_balance(const pa_cvolume
*v
, const pa_channel_map
*map
) {
610 pa_volume_t left
, right
;
615 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v
, map
), 0.0f
);
617 if (!pa_channel_map_can_balance(map
))
620 get_avg_lr(map
, v
, &left
, &right
);
635 return -1.0f
+ ((float) right
/ (float) left
);
637 return 1.0f
- ((float) left
/ (float) right
);
640 pa_cvolume
* pa_cvolume_set_balance(pa_cvolume
*v
, const pa_channel_map
*map
, float new_balance
) {
641 pa_volume_t left
, nleft
, right
, nright
, m
;
647 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v
, map
), NULL
);
648 pa_return_val_if_fail(new_balance
>= -1.0f
, NULL
);
649 pa_return_val_if_fail(new_balance
<= 1.0f
, NULL
);
651 if (!pa_channel_map_can_balance(map
))
654 get_avg_lr(map
, v
, &left
, &right
);
656 m
= PA_MAX(left
, right
);
658 if (new_balance
<= 0) {
659 nright
= (new_balance
+ 1.0f
) * m
;
662 nleft
= (1.0f
- new_balance
) * m
;
666 for (c
= 0; c
< map
->channels
; c
++) {
667 if (on_left(map
->map
[c
])) {
669 v
->values
[c
] = nleft
;
671 v
->values
[c
] = (pa_volume_t
) PA_CLAMP_VOLUME(((uint64_t) v
->values
[c
] * (uint64_t) nleft
) / (uint64_t) left
);
672 } else if (on_right(map
->map
[c
])) {
674 v
->values
[c
] = nright
;
676 v
->values
[c
] = (pa_volume_t
) PA_CLAMP_VOLUME(((uint64_t) v
->values
[c
] * (uint64_t) nright
) / (uint64_t) right
);
683 pa_cvolume
* pa_cvolume_scale(pa_cvolume
*v
, pa_volume_t max
) {
689 pa_return_val_if_fail(pa_cvolume_valid(v
), NULL
);
690 pa_return_val_if_fail(PA_VOLUME_IS_VALID(max
), NULL
);
692 t
= pa_cvolume_max(v
);
694 if (t
<= PA_VOLUME_MUTED
)
695 return pa_cvolume_set(v
, v
->channels
, max
);
697 for (c
= 0; c
< v
->channels
; c
++)
698 v
->values
[c
] = (pa_volume_t
) PA_CLAMP_VOLUME(((uint64_t) v
->values
[c
] * (uint64_t) max
) / (uint64_t) t
);
703 pa_cvolume
* pa_cvolume_scale_mask(pa_cvolume
*v
, pa_volume_t max
, pa_channel_map
*cm
, pa_channel_position_mask_t mask
) {
709 pa_return_val_if_fail(PA_VOLUME_IS_VALID(max
), NULL
);
712 return pa_cvolume_scale(v
, max
);
714 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v
, cm
), NULL
);
716 t
= pa_cvolume_max_mask(v
, cm
, mask
);
718 if (t
<= PA_VOLUME_MUTED
)
719 return pa_cvolume_set(v
, v
->channels
, max
);
721 for (c
= 0; c
< v
->channels
; c
++)
722 v
->values
[c
] = (pa_volume_t
) PA_CLAMP_VOLUME(((uint64_t) v
->values
[c
] * (uint64_t) max
) / (uint64_t) t
);
727 static void get_avg_fr(const pa_channel_map
*map
, const pa_cvolume
*v
, pa_volume_t
*f
, pa_volume_t
*r
) {
729 pa_volume_t front
= 0, rear
= 0;
730 unsigned n_front
= 0, n_rear
= 0;
734 pa_assert(map
->channels
== v
->channels
);
738 for (c
= 0; c
< map
->channels
; c
++) {
739 if (on_front(map
->map
[c
])) {
740 front
+= v
->values
[c
];
742 } else if (on_rear(map
->map
[c
])) {
743 rear
+= v
->values
[c
];
751 *f
= front
/ n_front
;
759 float pa_cvolume_get_fade(const pa_cvolume
*v
, const pa_channel_map
*map
) {
760 pa_volume_t front
, rear
;
765 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v
, map
), 0.0f
);
767 if (!pa_channel_map_can_fade(map
))
770 get_avg_fr(map
, v
, &front
, &rear
);
776 return -1.0f
+ ((float) front
/ (float) rear
);
778 return 1.0f
- ((float) rear
/ (float) front
);
781 pa_cvolume
* pa_cvolume_set_fade(pa_cvolume
*v
, const pa_channel_map
*map
, float new_fade
) {
782 pa_volume_t front
, nfront
, rear
, nrear
, m
;
788 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v
, map
), NULL
);
789 pa_return_val_if_fail(new_fade
>= -1.0f
, NULL
);
790 pa_return_val_if_fail(new_fade
<= 1.0f
, NULL
);
792 if (!pa_channel_map_can_fade(map
))
795 get_avg_fr(map
, v
, &front
, &rear
);
797 m
= PA_MAX(front
, rear
);
800 nfront
= (new_fade
+ 1.0f
) * m
;
803 nrear
= (1.0f
- new_fade
) * m
;
807 for (c
= 0; c
< map
->channels
; c
++) {
808 if (on_front(map
->map
[c
])) {
810 v
->values
[c
] = nfront
;
812 v
->values
[c
] = (pa_volume_t
) PA_CLAMP_VOLUME(((uint64_t) v
->values
[c
] * (uint64_t) nfront
) / (uint64_t) front
);
813 } else if (on_rear(map
->map
[c
])) {
815 v
->values
[c
] = nrear
;
817 v
->values
[c
] = (pa_volume_t
) PA_CLAMP_VOLUME(((uint64_t) v
->values
[c
] * (uint64_t) nrear
) / (uint64_t) rear
);
824 pa_cvolume
* pa_cvolume_set_position(
826 const pa_channel_map
*map
,
827 pa_channel_position_t t
,
831 pa_bool_t good
= FALSE
;
836 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(cv
, map
), NULL
);
837 pa_return_val_if_fail(t
< PA_CHANNEL_POSITION_MAX
, NULL
);
838 pa_return_val_if_fail(PA_VOLUME_IS_VALID(v
), NULL
);
840 for (c
= 0; c
< map
->channels
; c
++)
841 if (map
->map
[c
] == t
) {
846 return good
? cv
: NULL
;
849 pa_volume_t
pa_cvolume_get_position(
851 const pa_channel_map
*map
,
852 pa_channel_position_t t
) {
855 pa_volume_t v
= PA_VOLUME_MUTED
;
860 pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(cv
, map
), PA_VOLUME_MUTED
);
861 pa_return_val_if_fail(t
< PA_CHANNEL_POSITION_MAX
, PA_VOLUME_MUTED
);
863 for (c
= 0; c
< map
->channels
; c
++)
864 if (map
->map
[c
] == t
)
865 if (cv
->values
[c
] > v
)
871 pa_cvolume
* pa_cvolume_merge(pa_cvolume
*dest
, const pa_cvolume
*a
, const pa_cvolume
*b
) {
878 pa_return_val_if_fail(pa_cvolume_valid(a
), NULL
);
879 pa_return_val_if_fail(pa_cvolume_valid(b
), NULL
);
881 for (i
= 0; i
< a
->channels
&& i
< b
->channels
; i
++)
882 dest
->values
[i
] = PA_MAX(a
->values
[i
], b
->values
[i
]);
884 dest
->channels
= (uint8_t) i
;
889 pa_cvolume
* pa_cvolume_inc_clamp(pa_cvolume
*v
, pa_volume_t inc
, pa_volume_t limit
) {
894 pa_return_val_if_fail(pa_cvolume_valid(v
), NULL
);
895 pa_return_val_if_fail(PA_VOLUME_IS_VALID(inc
), NULL
);
897 m
= pa_cvolume_max(v
);
899 if (m
>= limit
- inc
)
904 return pa_cvolume_scale(v
, m
);
907 pa_cvolume
* pa_cvolume_inc(pa_cvolume
*v
, pa_volume_t inc
) {
908 return pa_cvolume_inc_clamp(v
, inc
, PA_VOLUME_MAX
);
911 pa_cvolume
* pa_cvolume_dec(pa_cvolume
*v
, pa_volume_t dec
) {
916 pa_return_val_if_fail(pa_cvolume_valid(v
), NULL
);
917 pa_return_val_if_fail(PA_VOLUME_IS_VALID(dec
), NULL
);
919 m
= pa_cvolume_max(v
);
921 if (m
<= PA_VOLUME_MUTED
+ dec
)
926 return pa_cvolume_scale(v
, m
);