diff options
| -rw-r--r-- | src/pulse/volume.c | 30 | ||||
| -rw-r--r-- | src/pulse/volume.h | 17 |
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; |