#include <stdio.h>
#include <alsa/asoundlib.h>

#define RATE 44100
#define CHANNELS 2

#define CHK(msg, r) \
{ \
	if ((r) < 0) { \
		fprintf(stderr, "%s: %s\n", msg, snd_strerror(r)); \
		return -1; \
	} \
}

int main(int argc, char *argv[])
{
	int r, dir;
	unsigned int p;
	snd_pcm_t *pcm;
	snd_pcm_hw_params_t *hw_params;
	snd_pcm_uframes_t buffer_size, period_size;

	r = snd_pcm_open(&pcm, argv[1], SND_PCM_STREAM_CAPTURE, 0);
	CHK("open", r);

	r = snd_pcm_hw_params_malloc(&hw_params);
	CHK("params_malloc", r);

	r = snd_pcm_hw_params_any(pcm, hw_params);
	CHK("params_any", r);

	r = snd_pcm_hw_params_set_access(pcm, hw_params,
					 SND_PCM_ACCESS_RW_INTERLEAVED);
	CHK("params_set_access", r);

	r = snd_pcm_hw_params_set_format(pcm, hw_params, SND_PCM_FORMAT_S32);
	CHK("set_format", r);

	r = snd_pcm_hw_params_set_rate(pcm, hw_params, RATE, 0);
	CHK("set_rate", r);

	r = snd_pcm_hw_params_set_channels(pcm, hw_params, CHANNELS);
	CHK("set_channels",r);

	if (argc > 2) {
	        p = atoi(argv[2]) * 1000;
		r = snd_pcm_hw_params_set_buffer_time_near(pcm, hw_params,
							   &p, &dir);
		CHK("set_buffer_time_near", r);
	}

	if (argc > 3) {
		p = atoi(argv[3]) * 1000;
		r = snd_pcm_hw_params_set_period_time_near(pcm, hw_params,
							   &p, &dir);
		CHK("set_period_time_near", r);
	}

	r = snd_pcm_hw_params(pcm, hw_params);
	CHK("hw_params", r);

	r = snd_pcm_hw_params_get_buffer_size(hw_params, &buffer_size);
	CHK("get_buffer_size", r);

	r = snd_pcm_hw_params_get_period_size(hw_params, &period_size, &dir);
	CHK("get_period_size", r);

	printf("buffer_size=%d period_size=%d\n",
	       (int)buffer_size, (int)period_size);

	r = snd_pcm_close(pcm);
	CHK("pcm_close", r);

	return 0;
}