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git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@17 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2004-06-15 15:18:33 +00:00
parent 98f41f1e70
commit 78f386ad45
19 changed files with 269 additions and 201 deletions
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53
src/sample.c
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@ -33,24 +33,6 @@ struct memblock *silence(struct memblock* b, struct sample_spec *spec) {
return b;
}
void add_clip(struct memchunk *target, struct memchunk *chunk, struct sample_spec *spec) {
int16_t *p, *d;
size_t i;
assert(target && target->memblock && chunk && chunk->memblock && spec);
assert(spec->format == SAMPLE_S16NE);
assert((target->length & 1) == 0);
d = target->memblock->data + target->index;
p = chunk->memblock->data + chunk->index;
for (i = 0; i < target->length && i < chunk->length; i++) {
int32_t r = (int32_t) *d + (int32_t) *p;
if (r < -0x8000) r = 0x8000;
if (r > 0x7FFF) r = 0x7FFF;
*d = (int16_t) r;
}
}
size_t sample_size(struct sample_spec *spec) {
assert(spec);
size_t b = 1;
@ -78,3 +60,38 @@ size_t bytes_per_second(struct sample_spec *spec) {
return spec->rate*sample_size(spec);
}
size_t mix_chunks(struct mix_info channels[], unsigned nchannels, void *data, size_t length, struct sample_spec *spec) {
unsigned c, d;
assert(chunks && target && spec);
assert(spec->format == SAMPLE_S16NE);
for (d = 0;; d += sizeof(int16_t)) {
int32_t sum = 0;
if (d >= length)
return d;
for (c = 0; c < nchannels; c++) {
int32_t v;
uint8_t volume = channels[c].volume;
if (d >= channels[c].chunk.length)
return d;
if (volume == 0)
v = 0;
else {
v = *((int16_t*) (channels[c].chunk->memblock->data + channels[c].chunk->index + d));
if (volume != 0xFF)
v = v*volume/0xFF;
}
sum += v;
}
if (sum < -0x8000) sum = -0x8000;
if (sum > 0x7FFF) sum = 0x7FFF;
*(data++) = sum;
}
}