PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
- by the Free Software Foundation; either version 2 of the License,
+ by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
#include <stdio.h>
#include <string.h>
+#include <math.h>
#include <pulse/i18n.h>
+
#include <pulsecore/core-util.h>
#include <pulsecore/macro.h>
+#include <pulsecore/sample-util.h>
#include "volume.h"
pa_assert(a);
pa_assert(b);
+ pa_return_val_if_fail(pa_cvolume_valid(a), 0);
+
+ if (PA_UNLIKELY(a == b))
+ return 1;
+
+ pa_return_val_if_fail(pa_cvolume_valid(b), 0);
+
if (a->channels != b->channels)
return 0;
a->channels = 0;
for (c = 0; c < PA_CHANNELS_MAX; c++)
- a->values[c] = (pa_volume_t) -1;
+ a->values[c] = PA_VOLUME_INVALID;
return a;
}
a->channels = (uint8_t) channels;
for (i = 0; i < a->channels; i++)
- a->values[i] = v;
+ /* Clamp in case there is stale data that exceeds the current
+ * PA_VOLUME_MAX */
+ a->values[i] = PA_CLAMP_VOLUME(v);
return a;
}
pa_volume_t pa_cvolume_avg(const pa_cvolume *a) {
uint64_t sum = 0;
- int i;
+ unsigned c;
+
pa_assert(a);
+ pa_return_val_if_fail(pa_cvolume_valid(a), PA_VOLUME_MUTED);
- for (i = 0; i < a->channels; i++)
- sum += a->values[i];
+ for (c = 0; c < a->channels; c++)
+ sum += a->values[c];
sum /= a->channels;
return (pa_volume_t) sum;
}
+pa_volume_t pa_cvolume_avg_mask(const pa_cvolume *a, const pa_channel_map *cm, pa_channel_position_mask_t mask) {
+ uint64_t sum = 0;
+ unsigned c, n;
+
+ pa_assert(a);
+
+ if (!cm)
+ return pa_cvolume_avg(a);
+
+ pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(a, cm), PA_VOLUME_MUTED);
+
+ for (c = n = 0; c < a->channels; c++) {
+
+ if (!(PA_CHANNEL_POSITION_MASK(cm->map[c]) & mask))
+ continue;
+
+ sum += a->values[c];
+ n ++;
+ }
+
+ if (n > 0)
+ sum /= n;
+
+ return (pa_volume_t) sum;
+}
+
pa_volume_t pa_cvolume_max(const pa_cvolume *a) {
- pa_volume_t m = 0;
- int i;
+ pa_volume_t m = PA_VOLUME_MUTED;
+ unsigned c;
+
pa_assert(a);
+ pa_return_val_if_fail(pa_cvolume_valid(a), PA_VOLUME_MUTED);
- for (i = 0; i < a->channels; i++)
- if (a->values[i] > m)
- m = a->values[i];
+ for (c = 0; c < a->channels; c++)
+ if (a->values[c] > m)
+ m = a->values[c];
+
+ return m;
+}
+
+pa_volume_t pa_cvolume_min(const pa_cvolume *a) {
+ pa_volume_t m = PA_VOLUME_MAX;
+ unsigned c;
+
+ pa_assert(a);
+ pa_return_val_if_fail(pa_cvolume_valid(a), PA_VOLUME_MUTED);
+
+ for (c = 0; c < a->channels; c++)
+ if (a->values[c] < m)
+ m = a->values[c];
+
+ return m;
+}
+
+pa_volume_t pa_cvolume_max_mask(const pa_cvolume *a, const pa_channel_map *cm, pa_channel_position_mask_t mask) {
+ pa_volume_t m = PA_VOLUME_MUTED;
+ unsigned c;
+
+ pa_assert(a);
+
+ if (!cm)
+ return pa_cvolume_max(a);
+
+ pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(a, cm), PA_VOLUME_MUTED);
+
+ for (c = 0; c < a->channels; c++) {
+
+ if (!(PA_CHANNEL_POSITION_MASK(cm->map[c]) & mask))
+ continue;
+
+ if (a->values[c] > m)
+ m = a->values[c];
+ }
+
+ return m;
+}
+
+pa_volume_t pa_cvolume_min_mask(const pa_cvolume *a, const pa_channel_map *cm, pa_channel_position_mask_t mask) {
+ pa_volume_t m = PA_VOLUME_MAX;
+ unsigned c;
+
+ pa_assert(a);
+
+ if (!cm)
+ return pa_cvolume_min(a);
+
+ pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(a, cm), PA_VOLUME_MUTED);
+
+ for (c = 0; c < a->channels; c++) {
+
+ if (!(PA_CHANNEL_POSITION_MASK(cm->map[c]) & mask))
+ continue;
+
+ if (a->values[c] < m)
+ m = a->values[c];
+ }
return m;
}
pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b) {
- return pa_sw_volume_from_linear(pa_sw_volume_to_linear(a) * pa_sw_volume_to_linear(b));
+
+ pa_return_val_if_fail(PA_VOLUME_IS_VALID(a), PA_VOLUME_INVALID);
+ pa_return_val_if_fail(PA_VOLUME_IS_VALID(b), PA_VOLUME_INVALID);
+
+ /* cbrt((a/PA_VOLUME_NORM)^3*(b/PA_VOLUME_NORM)^3)*PA_VOLUME_NORM = a*b/PA_VOLUME_NORM */
+
+ return (pa_volume_t) PA_CLAMP_VOLUME((((uint64_t) a * (uint64_t) b + (uint64_t) PA_VOLUME_NORM / 2ULL) / (uint64_t) PA_VOLUME_NORM));
}
pa_volume_t pa_sw_volume_divide(pa_volume_t a, pa_volume_t b) {
- double v = pa_sw_volume_to_linear(b);
- if (v <= 0)
+ pa_return_val_if_fail(PA_VOLUME_IS_VALID(a), PA_VOLUME_INVALID);
+ pa_return_val_if_fail(PA_VOLUME_IS_VALID(b), PA_VOLUME_INVALID);
+
+ if (b <= PA_VOLUME_MUTED)
return 0;
- return pa_sw_volume_from_linear(pa_sw_volume_to_linear(a) / v);
+ return (pa_volume_t) (((uint64_t) a * (uint64_t) PA_VOLUME_NORM + (uint64_t) b / 2ULL) / (uint64_t) b);
+}
+
+/* Amplitude, not power */
+static double linear_to_dB(double v) {
+ return 20.0 * log10(v);
}
-#define USER_DECIBEL_RANGE 60
+static double dB_to_linear(double v) {
+ return pow(10.0, v / 20.0);
+}
pa_volume_t pa_sw_volume_from_dB(double dB) {
- if (isinf(dB) < 0 || dB <= -USER_DECIBEL_RANGE)
+ if (isinf(dB) < 0 || dB <= PA_DECIBEL_MININFTY)
return PA_VOLUME_MUTED;
- return (pa_volume_t) lrint((dB/USER_DECIBEL_RANGE+1)*PA_VOLUME_NORM);
+ return pa_sw_volume_from_linear(dB_to_linear(dB));
}
double pa_sw_volume_to_dB(pa_volume_t v) {
- if (v == PA_VOLUME_MUTED)
+
+ pa_return_val_if_fail(PA_VOLUME_IS_VALID(v), PA_DECIBEL_MININFTY);
+
+ if (v <= PA_VOLUME_MUTED)
return PA_DECIBEL_MININFTY;
- return ((double) v/PA_VOLUME_NORM-1)*USER_DECIBEL_RANGE;
+ return linear_to_dB(pa_sw_volume_to_linear(v));
}
pa_volume_t pa_sw_volume_from_linear(double v) {
- if (v <= 0)
+ if (v <= 0.0)
return PA_VOLUME_MUTED;
- if (v > .999 && v < 1.001)
- return PA_VOLUME_NORM;
-
- return pa_sw_volume_from_dB(20*log10(v));
+ /*
+ * We use a cubic mapping here, as suggested and discussed here:
+ *
+ * http://www.robotplanet.dk/audio/audio_gui_design/
+ * http://lists.linuxaudio.org/pipermail/linux-audio-dev/2009-May/thread.html#23151
+ *
+ * We make sure that the conversion to linear and back yields the
+ * same volume value! That's why we need the lround() below!
+ */
+
+ return (pa_volume_t) PA_CLAMP_VOLUME((uint64_t) lround(cbrt(v) * PA_VOLUME_NORM));
}
double pa_sw_volume_to_linear(pa_volume_t v) {
+ double f;
- if (v == PA_VOLUME_MUTED)
- return 0;
+ pa_return_val_if_fail(PA_VOLUME_IS_VALID(v), 0.0);
+
+ if (v <= PA_VOLUME_MUTED)
+ return 0.0;
- return pow(10.0, pa_sw_volume_to_dB(v)/20.0);
+ if (v == PA_VOLUME_NORM)
+ return 1.0;
+
+ f = ((double) v / PA_VOLUME_NORM);
+
+ return f*f*f;
}
char *pa_cvolume_snprint(char *s, size_t l, const pa_cvolume *c) {
l -= pa_snprintf(e, l, "%s%u: %3u%%",
first ? "" : " ",
channel,
- (c->values[channel]*100)/PA_VOLUME_NORM);
+ (c->values[channel]*100+PA_VOLUME_NORM/2)/PA_VOLUME_NORM);
e = strchr(e, 0);
first = FALSE;
pa_init_i18n();
- if (v == (pa_volume_t) -1) {
+ if (!PA_VOLUME_IS_VALID(v)) {
pa_snprintf(s, l, _("(invalid)"));
return s;
}
- pa_snprintf(s, l, "%3u%%", (v*100)/PA_VOLUME_NORM);
+ pa_snprintf(s, l, "%3u%%", (v*100+PA_VOLUME_NORM/2)/PA_VOLUME_NORM);
return s;
}
l -= pa_snprintf(e, l, "%s%u: %0.2f dB",
first ? "" : " ",
channel,
- isinf(f) < 0 || f <= -USER_DECIBEL_RANGE ? -INFINITY : f);
+ isinf(f) < 0 || f <= PA_DECIBEL_MININFTY ? -INFINITY : f);
e = strchr(e, 0);
first = FALSE;
pa_init_i18n();
- if (v == (pa_volume_t) -1) {
+ if (!PA_VOLUME_IS_VALID(v)) {
pa_snprintf(s, l, _("(invalid)"));
return s;
}
f = pa_sw_volume_to_dB(v);
- pa_snprintf(s, l, "%0.2f dB",
- isinf(f) < 0 || f <= -USER_DECIBEL_RANGE ? -INFINITY : f);
+ pa_snprintf(s, l, "%0.2f dB", isinf(f) < 0 || f <= PA_DECIBEL_MININFTY ? -INFINITY : f);
return s;
}
-/** Return non-zero if the volume of all channels is equal to the specified value */
int pa_cvolume_channels_equal_to(const pa_cvolume *a, pa_volume_t v) {
unsigned c;
pa_assert(a);
+ pa_return_val_if_fail(pa_cvolume_valid(a), 0);
+ pa_return_val_if_fail(PA_VOLUME_IS_VALID(v), 0);
+
for (c = 0; c < a->channels; c++)
if (a->values[c] != v)
return 0;
pa_assert(a);
pa_assert(b);
- for (i = 0; i < a->channels && i < b->channels && i < PA_CHANNELS_MAX; i++)
+ pa_return_val_if_fail(pa_cvolume_valid(a), NULL);
+ pa_return_val_if_fail(pa_cvolume_valid(b), NULL);
+
+ for (i = 0; i < a->channels && i < b->channels; i++)
dest->values[i] = pa_sw_volume_multiply(a->values[i], b->values[i]);
dest->channels = (uint8_t) i;
return dest;
}
+pa_cvolume *pa_sw_cvolume_multiply_scalar(pa_cvolume *dest, const pa_cvolume *a, pa_volume_t b) {
+ unsigned i;
+
+ pa_assert(dest);
+ pa_assert(a);
+
+ pa_return_val_if_fail(pa_cvolume_valid(a), NULL);
+ pa_return_val_if_fail(PA_VOLUME_IS_VALID(b), NULL);
+
+ for (i = 0; i < a->channels; i++)
+ dest->values[i] = pa_sw_volume_multiply(a->values[i], b);
+
+ dest->channels = (uint8_t) i;
+
+ return dest;
+}
+
pa_cvolume *pa_sw_cvolume_divide(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b) {
unsigned i;
pa_assert(a);
pa_assert(b);
- for (i = 0; i < a->channels && i < b->channels && i < PA_CHANNELS_MAX; i++)
+ pa_return_val_if_fail(pa_cvolume_valid(a), NULL);
+ pa_return_val_if_fail(pa_cvolume_valid(b), NULL);
+
+ for (i = 0; i < a->channels && i < b->channels; i++)
dest->values[i] = pa_sw_volume_divide(a->values[i], b->values[i]);
dest->channels = (uint8_t) i;
return dest;
}
+pa_cvolume *pa_sw_cvolume_divide_scalar(pa_cvolume *dest, const pa_cvolume *a, pa_volume_t b) {
+ unsigned i;
+
+ pa_assert(dest);
+ pa_assert(a);
+
+ pa_return_val_if_fail(pa_cvolume_valid(a), NULL);
+ pa_return_val_if_fail(PA_VOLUME_IS_VALID(b), NULL);
+
+ for (i = 0; i < a->channels; i++)
+ dest->values[i] = pa_sw_volume_divide(a->values[i], b);
+
+ dest->channels = (uint8_t) i;
+
+ return dest;
+}
+
int pa_cvolume_valid(const pa_cvolume *v) {
unsigned c;
return 0;
for (c = 0; c < v->channels; c++)
- if (v->values[c] == (pa_volume_t) -1)
+ if (!PA_VOLUME_IS_VALID(v->values[c]))
return 0;
return 1;
}
static pa_bool_t on_left(pa_channel_position_t p) {
-
- return
- p == PA_CHANNEL_POSITION_FRONT_LEFT ||
- p == PA_CHANNEL_POSITION_REAR_LEFT ||
- p == PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER ||
- p == PA_CHANNEL_POSITION_SIDE_LEFT ||
- p == PA_CHANNEL_POSITION_TOP_FRONT_LEFT ||
- p == PA_CHANNEL_POSITION_TOP_REAR_LEFT;
+ return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_LEFT);
}
static pa_bool_t on_right(pa_channel_position_t p) {
-
- return
- p == PA_CHANNEL_POSITION_FRONT_RIGHT ||
- p == PA_CHANNEL_POSITION_REAR_RIGHT ||
- p == PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER ||
- p == PA_CHANNEL_POSITION_SIDE_RIGHT ||
- p == PA_CHANNEL_POSITION_TOP_FRONT_RIGHT ||
- p == PA_CHANNEL_POSITION_TOP_REAR_RIGHT;
+ return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_RIGHT);
}
static pa_bool_t on_center(pa_channel_position_t p) {
-
- return
- p == PA_CHANNEL_POSITION_FRONT_CENTER ||
- p == PA_CHANNEL_POSITION_REAR_CENTER ||
- p == PA_CHANNEL_POSITION_TOP_CENTER ||
- p == PA_CHANNEL_POSITION_TOP_FRONT_CENTER ||
- p == PA_CHANNEL_POSITION_TOP_REAR_CENTER;
+ return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_CENTER);
}
static pa_bool_t on_lfe(pa_channel_position_t p) {
- return
- p == PA_CHANNEL_POSITION_LFE;
+ return p == PA_CHANNEL_POSITION_LFE;
+}
+
+static pa_bool_t on_front(pa_channel_position_t p) {
+ return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_FRONT);
}
-pa_cvolume *pa_cvolume_remap(pa_cvolume *v, pa_channel_map *from, pa_channel_map *to) {
+static pa_bool_t on_rear(pa_channel_position_t p) {
+ return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_REAR);
+}
+
+pa_cvolume *pa_cvolume_remap(pa_cvolume *v, const pa_channel_map *from, const pa_channel_map *to) {
int a, b;
pa_cvolume result;
pa_assert(v);
pa_assert(from);
pa_assert(to);
- pa_assert(v->channels == from->channels);
+
+ pa_return_val_if_fail(pa_channel_map_valid(to), NULL);
+ pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, from), NULL);
if (pa_channel_map_equal(from, to))
return v;
pa_assert(v);
pa_assert(ss);
- if (!pa_cvolume_valid(v))
- return 0;
-
- if (!pa_sample_spec_valid(ss))
- return 0;
+ pa_return_val_if_fail(pa_cvolume_valid(v), 0);
+ pa_return_val_if_fail(pa_sample_spec_valid(ss), 0);
return v->channels == ss->channels;
}
+int pa_cvolume_compatible_with_channel_map(const pa_cvolume *v, const pa_channel_map *cm) {
+ pa_assert(v);
+ pa_assert(cm);
+
+ pa_return_val_if_fail(pa_cvolume_valid(v), 0);
+ pa_return_val_if_fail(pa_channel_map_valid(cm), 0);
+
+ return v->channels == cm->channels;
+}
+
static void get_avg_lr(const pa_channel_map *map, const pa_cvolume *v, pa_volume_t *l, pa_volume_t *r) {
int c;
pa_volume_t left = 0, right = 0;
*r = right / n_right;
}
-float pa_cvolume_get_balance(const pa_channel_map *map, const pa_cvolume *v) {
+float pa_cvolume_get_balance(const pa_cvolume *v, const pa_channel_map *map) {
pa_volume_t left, right;
pa_assert(v);
pa_assert(map);
- pa_assert(map->channels == v->channels);
+
+ pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, map), 0.0f);
+
+ if (!pa_channel_map_can_balance(map))
+ return 0.0f;
get_avg_lr(map, v, &left, &right);
return 1.0f - ((float) left / (float) right);
}
-pa_cvolume* pa_cvolume_set_balance(const pa_channel_map *map, pa_cvolume *v, float new_balance) {
+pa_cvolume* pa_cvolume_set_balance(pa_cvolume *v, const pa_channel_map *map, float new_balance) {
pa_volume_t left, nleft, right, nright, m;
unsigned c;
- pa_assert(map->channels == v->channels);
pa_assert(map);
pa_assert(v);
- pa_assert(new_balance >= -1.0f);
- pa_assert(new_balance <= 1.0f);
+
+ pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, map), NULL);
+ pa_return_val_if_fail(new_balance >= -1.0f, NULL);
+ pa_return_val_if_fail(new_balance <= 1.0f, NULL);
+
+ if (!pa_channel_map_can_balance(map))
+ return v;
get_avg_lr(map, v, &left, &right);
m = PA_MAX(left, right);
if (new_balance <= 0) {
- nright = (new_balance + 1.0f) * m;
+ nright = (new_balance + 1.0f) * m;
nleft = m;
- } else {
+ } else {
nleft = (1.0f - new_balance) * m;
nright = m;
}
for (c = 0; c < map->channels; c++) {
if (on_left(map->map[c])) {
if (left == 0)
- v->values[c] = 0;
+ v->values[c] = nleft;
else
- v->values[c] = (pa_volume_t) (((uint64_t) v->values[c] * (uint64_t) nleft) / (uint64_t) left);
+ v->values[c] = (pa_volume_t) PA_CLAMP_VOLUME(((uint64_t) v->values[c] * (uint64_t) nleft) / (uint64_t) left);
} else if (on_right(map->map[c])) {
if (right == 0)
- v->values[c] = 0;
+ v->values[c] = nright;
else
- v->values[c] = (pa_volume_t) (((uint64_t) v->values[c] * (uint64_t) nright) / (uint64_t) right);
+ v->values[c] = (pa_volume_t) PA_CLAMP_VOLUME(((uint64_t) v->values[c] * (uint64_t) nright) / (uint64_t) right);
}
}
unsigned c;
pa_volume_t t = 0;
- pa_assert(c);
+ pa_assert(v);
+
+ pa_return_val_if_fail(pa_cvolume_valid(v), NULL);
+ pa_return_val_if_fail(PA_VOLUME_IS_VALID(max), NULL);
+
+ t = pa_cvolume_max(v);
+
+ if (t <= PA_VOLUME_MUTED)
+ return pa_cvolume_set(v, v->channels, max);
for (c = 0; c < v->channels; c++)
- if (v->values[c] > t)
- t = v->values[c];
+ v->values[c] = (pa_volume_t) PA_CLAMP_VOLUME(((uint64_t) v->values[c] * (uint64_t) max) / (uint64_t) t);
+
+ return v;
+}
+
+pa_cvolume* pa_cvolume_scale_mask(pa_cvolume *v, pa_volume_t max, pa_channel_map *cm, pa_channel_position_mask_t mask) {
+ unsigned c;
+ pa_volume_t t = 0;
- if (t <= 0)
+ pa_assert(v);
+
+ pa_return_val_if_fail(PA_VOLUME_IS_VALID(max), NULL);
+
+ if (!cm)
+ return pa_cvolume_scale(v, max);
+
+ pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, cm), NULL);
+
+ t = pa_cvolume_max_mask(v, cm, mask);
+
+ if (t <= PA_VOLUME_MUTED)
return pa_cvolume_set(v, v->channels, max);
for (c = 0; c < v->channels; c++)
- v->values[c] = (pa_volume_t) (((uint64_t) v->values[c] * (uint64_t) max) / (uint64_t) t);
+ v->values[c] = (pa_volume_t) PA_CLAMP_VOLUME(((uint64_t) v->values[c] * (uint64_t) max) / (uint64_t) t);
+
+ return v;
+}
+
+static void get_avg_fr(const pa_channel_map *map, const pa_cvolume *v, pa_volume_t *f, pa_volume_t *r) {
+ int c;
+ pa_volume_t front = 0, rear = 0;
+ unsigned n_front = 0, n_rear = 0;
+
+ pa_assert(v);
+ pa_assert(map);
+ pa_assert(map->channels == v->channels);
+ pa_assert(f);
+ pa_assert(r);
+
+ for (c = 0; c < map->channels; c++) {
+ if (on_front(map->map[c])) {
+ front += v->values[c];
+ n_front++;
+ } else if (on_rear(map->map[c])) {
+ rear += v->values[c];
+ n_rear++;
+ }
+ }
+
+ if (n_front <= 0)
+ *f = PA_VOLUME_NORM;
+ else
+ *f = front / n_front;
+
+ if (n_rear <= 0)
+ *r = PA_VOLUME_NORM;
+ else
+ *r = rear / n_rear;
+}
+
+float pa_cvolume_get_fade(const pa_cvolume *v, const pa_channel_map *map) {
+ pa_volume_t front, rear;
+
+ pa_assert(v);
+ pa_assert(map);
+
+ pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, map), 0.0f);
+
+ if (!pa_channel_map_can_fade(map))
+ return 0.0f;
+
+ get_avg_fr(map, v, &front, &rear);
+
+ if (front == rear)
+ return 0.0f;
+
+ if (rear > front)
+ return -1.0f + ((float) front / (float) rear);
+ else
+ return 1.0f - ((float) rear / (float) front);
+}
+
+pa_cvolume* pa_cvolume_set_fade(pa_cvolume *v, const pa_channel_map *map, float new_fade) {
+ pa_volume_t front, nfront, rear, nrear, m;
+ unsigned c;
+
+ pa_assert(map);
+ pa_assert(v);
+
+ pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, map), NULL);
+ pa_return_val_if_fail(new_fade >= -1.0f, NULL);
+ pa_return_val_if_fail(new_fade <= 1.0f, NULL);
+
+ if (!pa_channel_map_can_fade(map))
+ return v;
+
+ get_avg_fr(map, v, &front, &rear);
+
+ m = PA_MAX(front, rear);
+
+ if (new_fade <= 0) {
+ nfront = (new_fade + 1.0f) * m;
+ nrear = m;
+ } else {
+ nrear = (1.0f - new_fade) * m;
+ nfront = m;
+ }
+
+ for (c = 0; c < map->channels; c++) {
+ if (on_front(map->map[c])) {
+ if (front == 0)
+ v->values[c] = nfront;
+ else
+ v->values[c] = (pa_volume_t) PA_CLAMP_VOLUME(((uint64_t) v->values[c] * (uint64_t) nfront) / (uint64_t) front);
+ } else if (on_rear(map->map[c])) {
+ if (rear == 0)
+ v->values[c] = nrear;
+ else
+ v->values[c] = (pa_volume_t) PA_CLAMP_VOLUME(((uint64_t) v->values[c] * (uint64_t) nrear) / (uint64_t) rear);
+ }
+ }
+
+ return v;
+}
+
+pa_cvolume* pa_cvolume_set_position(
+ pa_cvolume *cv,
+ const pa_channel_map *map,
+ pa_channel_position_t t,
+ pa_volume_t v) {
+
+ unsigned c;
+ pa_bool_t good = FALSE;
+
+ pa_assert(cv);
+ pa_assert(map);
+
+ pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(cv, map), NULL);
+ pa_return_val_if_fail(t < PA_CHANNEL_POSITION_MAX, NULL);
+ pa_return_val_if_fail(PA_VOLUME_IS_VALID(v), NULL);
+
+ for (c = 0; c < map->channels; c++)
+ if (map->map[c] == t) {
+ cv->values[c] = v;
+ good = TRUE;
+ }
+
+ return good ? cv : NULL;
+}
+
+pa_volume_t pa_cvolume_get_position(
+ pa_cvolume *cv,
+ const pa_channel_map *map,
+ pa_channel_position_t t) {
+
+ unsigned c;
+ pa_volume_t v = PA_VOLUME_MUTED;
+
+ pa_assert(cv);
+ pa_assert(map);
+
+ pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(cv, map), PA_VOLUME_MUTED);
+ pa_return_val_if_fail(t < PA_CHANNEL_POSITION_MAX, PA_VOLUME_MUTED);
+
+ for (c = 0; c < map->channels; c++)
+ if (map->map[c] == t)
+ if (cv->values[c] > v)
+ v = cv->values[c];
return v;
}
+
+pa_cvolume* pa_cvolume_merge(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b) {
+ unsigned i;
+
+ pa_assert(dest);
+ pa_assert(a);
+ pa_assert(b);
+
+ pa_return_val_if_fail(pa_cvolume_valid(a), NULL);
+ pa_return_val_if_fail(pa_cvolume_valid(b), NULL);
+
+ for (i = 0; i < a->channels && i < b->channels; i++)
+ dest->values[i] = PA_MAX(a->values[i], b->values[i]);
+
+ dest->channels = (uint8_t) i;
+
+ return dest;
+}
+
+pa_cvolume* pa_cvolume_inc_clamp(pa_cvolume *v, pa_volume_t inc, pa_volume_t limit) {
+ pa_volume_t m;
+
+ pa_assert(v);
+
+ pa_return_val_if_fail(pa_cvolume_valid(v), NULL);
+ pa_return_val_if_fail(PA_VOLUME_IS_VALID(inc), NULL);
+
+ m = pa_cvolume_max(v);
+
+ if (m >= limit - inc)
+ m = limit;
+ else
+ m += inc;
+
+ return pa_cvolume_scale(v, m);
+}
+
+pa_cvolume* pa_cvolume_inc(pa_cvolume *v, pa_volume_t inc){
+ return pa_cvolume_inc_clamp(v, inc, PA_VOLUME_MAX);
+}
+
+pa_cvolume* pa_cvolume_dec(pa_cvolume *v, pa_volume_t dec) {
+ pa_volume_t m;
+
+ pa_assert(v);
+
+ pa_return_val_if_fail(pa_cvolume_valid(v), NULL);
+ pa_return_val_if_fail(PA_VOLUME_IS_VALID(dec), NULL);
+
+ m = pa_cvolume_max(v);
+
+ if (m <= PA_VOLUME_MUTED + dec)
+ m = PA_VOLUME_MUTED;
+ else
+ m -= dec;
+
+ return pa_cvolume_scale(v, m);
+}