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volume work

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git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@42 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2004-06-29 20:37:24 +00:00
parent e31bac0257
commit d571be6f51
12 changed files with 203 additions and 35 deletions
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54
src/sample-util.c
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@ -1,3 +1,4 @@
#include <stdio.h>
#include <string.h>
#include <assert.h>
@ -46,7 +47,7 @@ void silence_memory(void *p, size_t length, struct pa_sample_spec *spec) {
memset(p, c, length);
}
size_t mix_chunks(struct mix_info channels[], unsigned nchannels, void *data, size_t length, struct pa_sample_spec *spec, uint8_t volume) {
size_t mix_chunks(struct mix_info channels[], unsigned nchannels, void *data, size_t length, struct pa_sample_spec *spec, uint32_t volume) {
unsigned c, d;
assert(channels && data && length && spec);
assert(spec->format == PA_SAMPLE_S16NE);
@ -59,27 +60,27 @@ size_t mix_chunks(struct mix_info channels[], unsigned nchannels, void *data, si
for (c = 0; c < nchannels; c++) {
int32_t v;
uint8_t volume = channels[c].volume;
uint32_t volume = channels[c].volume;
if (d >= channels[c].chunk.length)
return d;
if (volume == 0)
if (volume == VOLUME_MUTE)
v = 0;
else {
v = *((int16_t*) (channels[c].chunk.memblock->data + channels[c].chunk.index + d));
if (volume != 0xFF)
v = v*volume/0xFF;
if (volume != VOLUME_NORM)
v = (int32_t) ((float)v*volume/VOLUME_NORM);
}
sum += v;
}
if (volume == 0)
if (volume == VOLUME_MUTE)
sum = 0;
else if (volume != 0xFF)
sum = sum*volume/0xFF;
else if (volume != VOLUME_NORM)
sum = (int32_t) ((float) sum*volume/VOLUME_NORM);
if (sum < -0x8000) sum = -0x8000;
if (sum > 0x7FFF) sum = 0x7FFF;
@ -88,3 +89,40 @@ size_t mix_chunks(struct mix_info channels[], unsigned nchannels, void *data, si
data += sizeof(int16_t);
}
}
void volume_memchunk(struct memchunk*c, struct pa_sample_spec *spec, uint32_t volume) {
int16_t *d;
size_t n;
assert(c && spec && (c->length % pa_sample_size(spec) == 0));
assert(spec->format == PA_SAMPLE_S16NE);
memblock_assert_exclusive(c->memblock);
if (volume == VOLUME_NORM)
return;
if (volume == VOLUME_MUTE) {
silence_memchunk(c, spec);
return;
}
for (d = (c->memblock->data+c->index), n = c->length/sizeof(int16_t); n > 0; d++, n--) {
int32_t t = (int32_t)(*d);
t *= volume;
t /= VOLUME_NORM;
if (t < -0x8000) t = -0x8000;
if (t > 0x7FFF) t = 0x7FFF;
*d = (int16_t) t;
}
}
uint32_t volume_multiply(uint32_t a, uint32_t b) {
uint64_t p = a;
p *= b;
p /= VOLUME_NORM;
return (uint32_t) p;
}