Is there any difference if I write in my code:
while (size > 0) {
frames = size;
err = snd_pcm_mmap_begin(handle, &my_areas, &offset, &frames);
record_buffor(my_areas, offset, frames, &data->phase);
snd_pcm_mmap_commit(handle, offset, frames);
size -= frames;
}
OR
while (rest > 0) {
size_t c = (rest <= (off64_t)chunk_bytes) ? (size_t)rest : chunk_bytes;
size_t f = c * 8 / bits_per_frame;
snd_pcm_mmap_readi(audiobuf, f);
write(fd, audiobuf, c);
rest -= c;
}
In the first code I use the example from alsa-lib/test/pcm.c and in the second I use alsa-utils/aplay.c.
Is there any difference in speed, latency or somethink I don't know?
I want to have low latency capture and compute fft - is it good way to do this?
Is true that snd_async_handler_t *ahandler is better for realtime system than nonblocking mode?
Best wishes
Marek Michalak
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