summaryrefslogtreecommitdiffstats
path: root/src/pulse
diff options
context:
space:
mode:
authorLennart Poettering <lennart@poettering.net>2008-10-04 01:40:41 +0200
committerLennart Poettering <lennart@poettering.net>2008-10-04 01:40:41 +0200
commitda4ad5ed01c02f6390c0e4e741734184707f655e (patch)
treeb1c9537b81d147d33d8ec92f303528365accb87f /src/pulse
parent87c8132ce3f58eb65e742f085b364850c40fbf6a (diff)
implement pa_sw_volume_divide() and pa_sw_cvolume_divide()
Diffstat (limited to 'src/pulse')
-rw-r--r--src/pulse/volume.c30
-rw-r--r--src/pulse/volume.h17
2 files changed, 40 insertions, 7 deletions
diff --git a/src/pulse/volume.c b/src/pulse/volume.c
index 0412819d..99a85f44 100644
--- a/src/pulse/volume.c
+++ b/src/pulse/volume.c
@@ -104,6 +104,15 @@ 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_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)
+ return 0;
+
+ return pa_sw_volume_from_linear(pa_sw_volume_to_linear(a) / v);
+}
+
#define USER_DECIBEL_RANGE 60
pa_volume_t pa_sw_volume_from_dB(double dB) {
@@ -220,12 +229,23 @@ pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const
pa_assert(a);
pa_assert(b);
- for (i = 0; i < a->channels && i < b->channels && i < PA_CHANNELS_MAX; i++) {
+ for (i = 0; i < a->channels && i < b->channels && i < PA_CHANNELS_MAX; i++)
+ dest->values[i] = pa_sw_volume_multiply(a->values[i], b->values[i]);
- dest->values[i] = pa_sw_volume_multiply(
- i < a->channels ? a->values[i] : PA_VOLUME_NORM,
- i < b->channels ? b->values[i] : PA_VOLUME_NORM);
- }
+ 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(dest);
+ pa_assert(a);
+ pa_assert(b);
+
+ for (i = 0; i < a->channels && i < b->channels && i < PA_CHANNELS_MAX; i++)
+ dest->values[i] = pa_sw_volume_divide(a->values[i], b->values[i]);
dest->channels = (uint8_t) i;
diff --git a/src/pulse/volume.h b/src/pulse/volume.h
index bfd8ca5b..75051af5 100644
--- a/src/pulse/volume.h
+++ b/src/pulse/volume.h
@@ -168,12 +168,25 @@ int pa_cvolume_channels_equal_to(const pa_cvolume *a, pa_volume_t v) PA_GCC_PURE
/** Return 1 if the specified volume has all channels on normal level */
#define pa_cvolume_is_norm(a) pa_cvolume_channels_equal_to((a), PA_VOLUME_NORM)
-/** Multiply two volumes specifications, return the result. This uses PA_VOLUME_NORM as neutral element of multiplication. This is only valid for software volumes! */
+/** Multiply two volume specifications, return the result. This uses
+ * PA_VOLUME_NORM as neutral element of multiplication. This is only
+ * valid for software volumes! */
pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b) PA_GCC_CONST;
-/** Multiply to per-channel volumes and return the result in *dest. This is only valid for software volumes! */
+/** Multiply two per-channel volumes and return the result in
+ * *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);
+/** 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
+ * *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);
+
/** Convert a decibel value to a volume. This is only valid for software volumes! */
pa_volume_t pa_sw_volume_from_dB(double f) PA_GCC_CONST;