static ssize_t pcm_read(u_char *data, size_t rcount)
{
ssize_t r;
size_t result = 0;
size_t count = rcount;
if (count != chunk_size) {
count = chunk_size;
}
while (count > 0) {
r = readi_func(handle, data, count);
if (r == -EAGAIN || (r >= 0 && (size_t)r < count)) {
snd_pcm_wait(handle, 1000);
} else if (r == -EPIPE) {
xrun();
} else if (r == -ESTRPIPE) {
suspend();
} else if (r < 0) {
error(_("read error: %s"), snd_strerror(r));
exit(EXIT_FAILURE);
}
if (r > 0) {
if (vumeter)
compute_max_peak(data, r * hwparams.channels);
result += r;
count -= r;
data += r * bits_per_frame / 8;
}
}
return rcount;
}
static ssize_t pcm_write(u_char *data, size_t count)
{
ssize_t r;
ssize_t result = 0;
if (count < chunk_size) {
snd_pcm_format_set_silence(hwparams.format, data + count * bits_per_frame / 8, (chunk_size - count) * hwparams.channels);
count = chunk_size;
}
while (count > 0) {
r = writei_func(handle, data, count);
if (r == -EAGAIN || (r >= 0 && (size_t)r < count)) {
snd_pcm_wait(handle, 1000);
} else if (r == -EPIPE) {
xrun();
} else if (r == -ESTRPIPE) {
suspend();
} else if (r < 0) {
error("write error: %s", snd_strerror(r));
exit(EXIT_FAILURE);
}
if (r > 0) {
if (vumeter)
compute_max_peak(data, r * hwparams.channels);
result += r;
count -= r;
data += r * bits_per_frame / 8;
}
}
return result;
}
