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Added peak meter for debugging purposes

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This commit is contained in:
Jaroslav Kysela 2001-09-06 08:57:52 +00:00
parent ca65b68980
commit 78b428e09a
1 changed files with 38 additions and 0 deletions
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38
aplay/aplay.c
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@ -87,6 +87,7 @@ static int buffer_pos = 0;
static size_t bits_per_sample, bits_per_frame;
static size_t chunk_bytes;
static snd_output_t *log;
static unsigned int max_peak = 0;
static int count;
static int vocmajor, vocminor;
@ -489,6 +490,12 @@ int main(int argc, char *argv[])
else
capturev(&argv[optind], argc - optind);
}
if (verbose) {
unsigned int max = (1 << bits_per_sample) - 1;
if (max == 0)
max = ~0;
printf("Max peak: %u (0x%x) %i%%\n", max_peak, max_peak, max_peak / (max / 100));
}
snd_pcm_close(handle);
free(audiobuf);
snd_output_close(log);
@ -846,6 +853,25 @@ void xrun(void)
exit(EXIT_FAILURE);
}
/* peak handler */
static void compute_max_peak(u_char *data, size_t count)
{
unsigned int val;
size_t step;
while (count-- > 0) {
switch (bits_per_sample) {
case 8: val = *data ^ snd_pcm_format_silence(hwparams.format); step = 1; break;
case 16: val = *(unsigned short *)data ^ snd_pcm_format_silence_16(hwparams.format); step = 2; break;
case 32: val = *(unsigned int *)data ^ snd_pcm_format_silence_32(hwparams.format); step = 4; break;
default: val = 0; step = 1; break;
}
data += step;
if (max_peak < val)
max_peak = val;
}
}
/*
* write function
*/
@ -871,6 +897,8 @@ static ssize_t pcm_write(u_char *data, size_t count)
exit(EXIT_FAILURE);
}
if (r > 0) {
if (verbose)
compute_max_peak(data, r * hwparams.channels);
result += r;
count -= r;
data += r * bits_per_frame / 8;
@ -909,6 +937,10 @@ static ssize_t pcm_writev(u_char **data, unsigned int channels, size_t count)
exit(EXIT_FAILURE);
}
if (r > 0) {
if (verbose) {
for (channel = 0; channel < channels; channel++)
compute_max_peak(data[channel], r);
}
result += r;
count -= r;
}
@ -942,6 +974,8 @@ static ssize_t pcm_read(u_char *data, size_t rcount)
exit(EXIT_FAILURE);
}
if (r > 0) {
if (verbose)
compute_max_peak(data, r * hwparams.channels);
result += r;
count -= r;
data += r * bits_per_frame / 8;
@ -977,6 +1011,10 @@ static ssize_t pcm_readv(u_char **data, unsigned int channels, size_t rcount)
exit(EXIT_FAILURE);
}
if (r > 0) {
if (verbose) {
for (channel = 0; channel < channels; channel++)
compute_max_peak(data[channel], r);
}
result += r;
count -= r;
}