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authorLennart Poettering <lennart@poettering.net>2009-06-17 03:04:21 +0200
committerLennart Poettering <lennart@poettering.net>2009-06-17 03:04:21 +0200
commit64b0f38b67ed221ac11d017bd27aa62c6b1a8c2b (patch)
treec4f58d6f6313bfbb0107220d0fffe82f8365c952 /src/pulse
parentc6830bd9dc53ee745ac331c4ab1c55134562d114 (diff)
volume: implement functions for multiplicating a cvolume with a scalar
Diffstat (limited to 'src/pulse')
-rw-r--r--src/pulse/volume.c36
-rw-r--r--src/pulse/volume.h12
2 files changed, 45 insertions, 3 deletions
diff --git a/src/pulse/volume.c b/src/pulse/volume.c
index 64688e0b..76ef7aa5 100644
--- a/src/pulse/volume.c
+++ b/src/pulse/volume.c
@@ -344,7 +344,7 @@ pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const
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 < PA_CHANNELS_MAX; i++)
+ 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;
@@ -352,6 +352,22 @@ pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const
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);
+
+ 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;
@@ -362,7 +378,7 @@ pa_cvolume *pa_sw_cvolume_divide(pa_cvolume *dest, const pa_cvolume *a, const pa
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 < PA_CHANNELS_MAX; i++)
+ 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;
@@ -370,6 +386,22 @@ pa_cvolume *pa_sw_cvolume_divide(pa_cvolume *dest, const pa_cvolume *a, const pa
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);
+
+ 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;
diff --git a/src/pulse/volume.h b/src/pulse/volume.h
index c07fd99a..05b7ebb4 100644
--- a/src/pulse/volume.h
+++ b/src/pulse/volume.h
@@ -216,16 +216,26 @@ pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b) PA_GCC_CONST;
* *dest. This is only valid for software volumes! */
pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b);
+/** Multiply a per-channel volume with a scalar volume and return the
+ * result in *dest. This is only valid for software volumes! \since
+ * 0.9.16 */
+pa_cvolume *pa_sw_cvolume_multiply_scalar(pa_cvolume *dest, const pa_cvolume *a, pa_volume_t b);
+
/** Divide two volume specifications, return the result. This uses
* PA_VOLUME_NORM as neutral element of division. This is only valid
* for software volumes! If a division by zero is tried the result
* will be 0. \since 0.9.13 */
pa_volume_t pa_sw_volume_divide(pa_volume_t a, pa_volume_t b) PA_GCC_CONST;
-/** Multiply to per-channel volumes and return the result in
+/** Divide two per-channel volumes and return the result in
* *dest. This is only valid for software volumes! \since 0.9.13 */
pa_cvolume *pa_sw_cvolume_divide(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b);
+/** Divide a per-channel volume by a scalar volume and return the
+ * result in *dest. This is only valid for software volumes! \since
+ * 0.9.16 */
+pa_cvolume *pa_sw_cvolume_divide_scalar(pa_cvolume *dest, const pa_cvolume *a, pa_volume_t b);
+
/** Convert a decibel value to a volume (amplitude, not power). This is only valid for software volumes! */
pa_volume_t pa_sw_volume_from_dB(double f) PA_GCC_CONST;