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pcm_volume: rename pcm_dither() to pcm_volume_dither()

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This commit is contained in:
Max Kellermann
2009-01-07 18:08:26 +01:00
parent b7b5e3f9c3
commit 6768581c41
3 changed files with 13 additions and 7 deletions
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9
src/pcm_mix.c
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@@ -37,7 +37,8 @@ pcm_add_8(int8_t *buffer1, const int8_t *buffer2,
int32_t sample2 = *buffer2++; int32_t sample2 = *buffer2++;
sample1 = ((sample1 * volume1 + sample2 * volume2) + sample1 = ((sample1 * volume1 + sample2 * volume2) +
pcm_dither() + PCM_VOLUME_1 / 2) / PCM_VOLUME_1; pcm_volume_dither() + PCM_VOLUME_1 / 2)
/ PCM_VOLUME_1;
*buffer1++ = pcm_range(sample1, 8); *buffer1++ = pcm_range(sample1, 8);
--num_samples; --num_samples;
@@ -53,7 +54,8 @@ pcm_add_16(int16_t *buffer1, const int16_t *buffer2,
int32_t sample2 = *buffer2++; int32_t sample2 = *buffer2++;
sample1 = ((sample1 * volume1 + sample2 * volume2) + sample1 = ((sample1 * volume1 + sample2 * volume2) +
pcm_dither() + PCM_VOLUME_1 / 2) / PCM_VOLUME_1; pcm_volume_dither() + PCM_VOLUME_1 / 2)
/ PCM_VOLUME_1;
*buffer1++ = pcm_range(sample1, 16); *buffer1++ = pcm_range(sample1, 16);
--num_samples; --num_samples;
@@ -69,7 +71,8 @@ pcm_add_24(int32_t *buffer1, const int32_t *buffer2,
int64_t sample2 = *buffer2++; int64_t sample2 = *buffer2++;
sample1 = ((sample1 * volume1 + sample2 * volume2) + sample1 = ((sample1 * volume1 + sample2 * volume2) +
pcm_dither() + PCM_VOLUME_1 / 2) / PCM_VOLUME_1; pcm_volume_dither() + PCM_VOLUME_1 / 2)
/ PCM_VOLUME_1;
*buffer1++ = pcm_range(sample1, 24); *buffer1++ = pcm_range(sample1, 24);
--num_samples; --num_samples;

9
src/pcm_volume.c
View File

@@ -34,7 +34,8 @@ pcm_volume_change_8(int8_t *buffer, unsigned num_samples, int volume)
while (num_samples > 0) { while (num_samples > 0) {
int32_t sample = *buffer; int32_t sample = *buffer;
sample = (sample * volume + pcm_dither() + PCM_VOLUME_1 / 2) sample = (sample * volume + pcm_volume_dither() +
PCM_VOLUME_1 / 2)
/ PCM_VOLUME_1; / PCM_VOLUME_1;
*buffer++ = pcm_range(sample, 8); *buffer++ = pcm_range(sample, 8);
@@ -48,7 +49,8 @@ pcm_volume_change_16(int16_t *buffer, unsigned num_samples, int volume)
while (num_samples > 0) { while (num_samples > 0) {
int32_t sample = *buffer; int32_t sample = *buffer;
sample = (sample * volume + pcm_dither() + PCM_VOLUME_1 / 2) sample = (sample * volume + pcm_volume_dither() +
PCM_VOLUME_1 / 2)
/ PCM_VOLUME_1; / PCM_VOLUME_1;
*buffer++ = pcm_range(sample, 16); *buffer++ = pcm_range(sample, 16);
@@ -62,7 +64,8 @@ pcm_volume_change_24(int32_t *buffer, unsigned num_samples, int volume)
while (num_samples > 0) { while (num_samples > 0) {
int64_t sample = *buffer; int64_t sample = *buffer;
sample = (sample * volume + pcm_dither() + PCM_VOLUME_1 / 2) sample = (sample * volume + pcm_volume_dither() +
PCM_VOLUME_1 / 2)
/ PCM_VOLUME_1; / PCM_VOLUME_1;
*buffer++ = pcm_range(sample, 24); *buffer++ = pcm_range(sample, 24);

2
src/pcm_volume.h
View File

@@ -41,7 +41,7 @@ pcm_float_to_volume(float volume)
} }
static inline int static inline int
pcm_dither(void) pcm_volume_dither(void)
{ {
static unsigned long state; static unsigned long state;
uint32_t r; uint32_t r;