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Fix VU meter

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Fixed VU meter output of 8 and 32bit samples.
This commit is contained in:
Takashi Iwai 2005-01-03 13:33:06 +00:00
parent 990153e3a4
commit 02244f65c0
1 changed files with 39 additions and 11 deletions
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50
aplay/aplay.c
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@ -955,6 +955,7 @@ static void set_params(void)
err = snd_pcm_sw_params_set_xfer_align(handle, swparams, xfer_align);
assert(err >= 0);
if (snd_pcm_sw_params(handle, swparams) < 0) {
error("unable to install sw params:");
snd_pcm_sw_params_dump(swparams, log);
@ -1062,19 +1063,46 @@ static void suspend(void)
static void compute_max_peak(u_char *data, size_t count)
{
signed int val, max, max_peak = 0, perc;
size_t step, ocount = count;
size_t ocount = count;
while (count-- > 0) {
switch (bits_per_sample) {
case 8: val = *(signed char *)data ^ snd_pcm_format_silence(hwparams.format); step = 1; break;
case 16: val = *(signed short *)data ^ snd_pcm_format_silence_16(hwparams.format); step = 2; break;
case 32: val = *(signed int *)data ^ snd_pcm_format_silence_32(hwparams.format); step = 4; break;
default: val = 0; step = 1; break;
switch (bits_per_sample) {
case 8: {
signed char *valp = (signed char *)data;
signed char mask = snd_pcm_format_silence(hwparams.format);
while (count-- > 0) {
val = *valp++ ^ mask;
val = abs(val);
if (max_peak < val)
max_peak = val;
}
data += step;
val = abs(val);
if (max_peak < val)
max_peak = val;
break;
}
case 16: {
signed short *valp = (signed short *)data;
signed short mask = snd_pcm_format_silence_16(hwparams.format);
count /= 2;
while (count-- > 0) {
val = *valp++ ^ mask;
val = abs(val);
if (max_peak < val)
max_peak = val;
}
break;
}
case 32: {
signed int *valp = (signed int *)data;
signed int mask = snd_pcm_format_silence_32(hwparams.format);
count /= 4;
while (count-- > 0) {
val = *valp++ ^ mask;
val = abs(val);
if (max_peak < val)
max_peak = val;
}
break;
}
default:
break;
}
max = 1 << (bits_per_sample-1);
if (max <= 0)