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pulse-server: convert between client cubic volume and linear

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This commit is contained in:
Wim Taymans 2020-10-23 09:36:01 +02:00
parent 2e3556fa12
commit 1ceb902b76
3 changed files with 39 additions and 18 deletions
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39
src/modules/module-protocol-pulse/message.c
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@ -22,6 +22,27 @@
* DEALINGS IN THE SOFTWARE.
*/
#define VOLUME_MUTED ((uint32_t) 0U)
#define VOLUME_NORM ((uint32_t) 0x10000U)
#define VOLUME_MAX ((uint32_t) UINT32_MAX/2)
static inline uint32_t volume_from_linear(float vol)
{
uint32_t v;
if (vol <= 0.0f)
v = VOLUME_MUTED;
else
v = SPA_CLAMP((uint64_t) lround(cbrt(vol) * VOLUME_NORM),
VOLUME_MUTED, VOLUME_MAX);
return v;
}
static inline float volume_to_linear(uint32_t vol)
{
float v = ((float)vol) / VOLUME_NORM;
return v * v * v;
}
struct descriptor {
uint32_t length;
uint32_t channel;
@ -203,11 +224,11 @@ static int read_volume(struct message *m, float *vol)
uint32_t v;
if ((res = read_u32(m, &v)) < 0)
return res;
*vol = ((float)v) / 0x10000U;
*vol = volume_to_linear(v);
return 0;
}
static int read_cvolume(struct message *m, struct cvolume *vol)
static int read_cvolume(struct message *m, struct volume *vol)
{
int res;
uint8_t i;
@ -336,7 +357,7 @@ static int message_get(struct message *m, ...)
case TAG_CVOLUME:
if (dtag != tag)
return -EINVAL;
if ((res = read_cvolume(m, va_arg(va, struct cvolume*))) < 0)
if ((res = read_cvolume(m, va_arg(va, struct volume*))) < 0)
return res;
break;
case TAG_PROPLIST:
@ -462,16 +483,16 @@ static void write_channel_map(struct message *m, struct channel_map *map)
static void write_volume(struct message *m, float vol)
{
write_8(m, TAG_VOLUME);
write_32(m, vol * 0x10000U);
write_32(m, volume_from_linear(vol));
}
static void write_cvolume(struct message *m, struct cvolume *cvol)
static void write_cvolume(struct message *m, struct volume *vol)
{
uint8_t i;
write_8(m, TAG_CVOLUME);
write_8(m, cvol->channels);
for (i = 0; i < cvol->channels; i ++)
write_32(m, cvol->values[i] * 0x10000U);
write_8(m, vol->channels);
for (i = 0; i < vol->channels; i ++)
write_32(m, volume_from_linear(vol->values[i]));
}
static void write_props(struct message *m, struct pw_properties *props)
@ -545,7 +566,7 @@ static int message_put(struct message *m, ...)
write_channel_map(m, va_arg(va, struct channel_map*));
break;
case TAG_CVOLUME:
write_cvolume(m, va_arg(va, struct cvolume*));
write_cvolume(m, va_arg(va, struct volume*));
break;
case TAG_PROPLIST:
write_props(m, va_arg(va, struct pw_properties*));