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mix: Add special cases for mixing streams in s16ne format

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Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
This commit is contained in:
Peter Meerwald 2013-02-13 17:27:07 +01:00 • committed by Tanu Kaskinen
parent c23963a99f
commit c1cac8d82b
1 changed files with 101 additions and 4 deletions
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105
src/pulsecore/mix.c
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@ -122,7 +122,91 @@ static const pa_calc_stream_volumes_func_t calc_stream_volumes_table[] = {
[PA_SAMPLE_S24_32BE] = (pa_calc_stream_volumes_func_t) calc_linear_integer_stream_volumes
};
static void pa_mix_s16ne_c(pa_mix_info streams[], unsigned nstreams, unsigned channels, void *data, void *end) {
/* special case: mix 2 s16ne streams, 1 channel each */
static void pa_mix2_ch1_s16ne(pa_mix_info streams[], int16_t *data, int16_t *end) {
const int16_t *ptr0 = streams[0].ptr;
const int16_t *ptr1 = streams[1].ptr;
const int32_t cv0 = streams[0].linear[0].i;
const int32_t cv1 = streams[1].linear[0].i;
while (data < end) {
int32_t sum;
sum = pa_mult_s16_volume(*ptr0++, cv0);
sum += pa_mult_s16_volume(*ptr1++, cv1);
sum = PA_CLAMP_UNLIKELY(sum, -0x8000, 0x7FFF);
*data++ = sum;
}
}
/* special case: mix 2 s16ne streams, 2 channels each */
static void pa_mix2_ch2_s16ne(pa_mix_info streams[], int16_t *data, int16_t *end) {
const int16_t *ptr0 = streams[0].ptr;
const int16_t *ptr1 = streams[1].ptr;
while (data < end) {
int32_t sum;
sum = pa_mult_s16_volume(*ptr0++, streams[0].linear[0].i);
sum += pa_mult_s16_volume(*ptr1++, streams[1].linear[0].i);
sum = PA_CLAMP_UNLIKELY(sum, -0x8000, 0x7FFF);
*data++ = sum;
sum = pa_mult_s16_volume(*ptr0++, streams[0].linear[1].i);
sum += pa_mult_s16_volume(*ptr1++, streams[1].linear[1].i);
sum = PA_CLAMP_UNLIKELY(sum, -0x8000, 0x7FFF);
*data++ = sum;
}
}
/* special case: mix 2 s16ne streams */
static void pa_mix2_s16ne(pa_mix_info streams[], unsigned channels, int16_t *data, int16_t *end) {
const int16_t *ptr0 = streams[0].ptr;
const int16_t *ptr1 = streams[1].ptr;
unsigned channel = 0;
while (data < end) {
int32_t sum;
sum = pa_mult_s16_volume(*ptr0++, streams[0].linear[channel].i);
sum += pa_mult_s16_volume(*ptr1++, streams[1].linear[channel].i);
sum = PA_CLAMP_UNLIKELY(sum, -0x8000, 0x7FFF);
*data++ = sum;
if (PA_UNLIKELY(++channel >= channels))
channel = 0;
}
}
/* special case: mix s16ne streams, 2 channels each */
static void pa_mix_ch2_s16ne(pa_mix_info streams[], unsigned nstreams, int16_t *data, int16_t *end) {
while (data < end) {
int32_t sum0 = 0, sum1 = 0;
unsigned i;
for (i = 0; i < nstreams; i++) {
pa_mix_info *m = streams + i;
int32_t cv0 = m->linear[0].i;
int32_t cv1 = m->linear[1].i;
sum0 += pa_mult_s16_volume(*((int16_t*) m->ptr), cv0);
m->ptr = (uint8_t*) m->ptr + sizeof(int16_t);
sum1 += pa_mult_s16_volume(*((int16_t*) m->ptr), cv1);
m->ptr = (uint8_t*) m->ptr + sizeof(int16_t);
}
*data++ = PA_CLAMP_UNLIKELY(sum0, -0x8000, 0x7FFF);
*data++ = PA_CLAMP_UNLIKELY(sum1, -0x8000, 0x7FFF);
}
}
static void pa_mix_generic_s16ne(pa_mix_info streams[], unsigned nstreams, unsigned channels, int16_t *data, int16_t *end) {
unsigned channel = 0;
while (data < end) {
@ -134,20 +218,33 @@ static void pa_mix_s16ne_c(pa_mix_info streams[], unsigned nstreams, unsigned ch
int32_t cv = m->linear[channel].i;
if (PA_LIKELY(cv > 0))
sum += pa_mult_s16_volume(*((int16_t*) m->ptr), m->linear[channel].i);
sum += pa_mult_s16_volume(*((int16_t*) m->ptr), cv);
m->ptr = (uint8_t*) m->ptr + sizeof(int16_t);
}
sum = PA_CLAMP_UNLIKELY(sum, -0x8000, 0x7FFF);
*((int16_t*) data) = (int16_t) sum;
*data = sum;
data = (uint8_t*) data + sizeof(int16_t);
data++;
if (PA_UNLIKELY(++channel >= channels))
channel = 0;
}
}
static void pa_mix_s16ne_c(pa_mix_info streams[], unsigned nstreams, unsigned channels, void *data, void *end) {
if (nstreams == 2 && channels == 1)
pa_mix2_ch1_s16ne(streams, data, end);
else if (nstreams == 2 && channels == 2)
pa_mix2_ch2_s16ne(streams, data, end);
else if (nstreams == 2)
pa_mix2_s16ne(streams, channels, data, end);
else if (channels == 2)
pa_mix_ch2_s16ne(streams, channels, data, end);
else
pa_mix_generic_s16ne(streams, nstreams, channels, data, end);
}
static void pa_mix_s16re_c(pa_mix_info streams[], unsigned nstreams, unsigned channels, void *data, void *end) {
unsigned channel = 0;