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volume: implement functions for multiplicating a cvolume with a scalar

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This commit is contained in:
Lennart Poettering 2009-06-17 03:04:21 +02:00
parent c6830bd9dc
commit 64b0f38b67
3 changed files with 47 additions and 3 deletions
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2
src/map-file
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@ -264,7 +264,9 @@ pa_stream_writable_size;
pa_stream_write;
pa_strerror;
pa_sw_cvolume_divide;
pa_sw_cvolume_divide_scalar;
pa_sw_cvolume_multiply;
pa_sw_cvolume_multiply_scalar;
pa_sw_cvolume_snprint_dB;
pa_sw_volume_divide;
pa_sw_volume_from_dB;

36
src/pulse/volume.c
View file

@ -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;

12
src/pulse/volume.h
View file

@ -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;