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Maarten de Boer <mdeboer@iua.upf.es>

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The attached patch makes the alsa-lib/test/pmc.c generate_sine code
slightly more simple, efficient and readable (but not less accurate),
taking quite some calculation out of the loop.
This commit is contained in:
Jaroslav Kysela 2004-03-05 09:11:13 +00:00
parent b282b1458c
commit 23ed7623c6
1 changed files with 3 additions and 3 deletions
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6
test/pcm.c
View file

@ -29,9 +29,9 @@ static void generate_sine(const snd_pcm_channel_area_t *areas,
snd_pcm_uframes_t offset, snd_pcm_uframes_t offset,
int count, double *_phase) int count, double *_phase)
{ {
static double max_phase = 2. * M_PI;
double phase = *_phase; double phase = *_phase;
double max_phase = 1.0 / freq; double step = max_phase*freq/(double)rate;
double step = 1.0 / (double)rate;
double res; double res;
signed short *samples[channels]; signed short *samples[channels];
int steps[channels]; int steps[channels];
@ -53,7 +53,7 @@ static void generate_sine(const snd_pcm_channel_area_t *areas,
} }
/* fill the channel areas */ /* fill the channel areas */
while (count-- > 0) { while (count-- > 0) {
res = sin((phase * 2 * M_PI) / max_phase - M_PI) * 32767; res = sin(phase) * 32767;
ires = res; ires = res;
for (chn = 0; chn < channels; chn++) { for (chn = 0; chn < channels; chn++) {
*samples[chn] = ires; *samples[chn] = ires;