/* to compile: gcc -O2 -Wall -o alsa_quickcrash alsa_quickcrash.c -lasound */

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

#define RATE 22050
#define CHANNELS 1
#define FORMAT SND_PCM_FORMAT_S16_LE
#define BUF_MS 60

#define DO(x) if (x < 0) { fprintf(stderr, "%s failed\n", #x); exit(1); }

int main()
{
	unsigned int rate = RATE;
	snd_pcm_uframes_t frames = RATE * BUF_MS / 1000;
	snd_pcm_t *handle;
	snd_pcm_hw_params_t *params;

	DO(snd_pcm_hw_params_malloc(&params));
	DO(snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 0));
	DO(snd_pcm_hw_params_any(handle, params));
	DO(snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED));
	DO(snd_pcm_hw_params_set_format(handle, params, FORMAT));
	DO(snd_pcm_hw_params_set_rate_near(handle, params, &rate, 0));
	DO(snd_pcm_hw_params_set_channels(handle, params, CHANNELS));
	DO(snd_pcm_hw_params_set_buffer_size_near(handle, params, &frames));
	DO(snd_pcm_hw_params(handle, params));
	DO(snd_pcm_prepare(handle));

	printf("PCM config dump:\n");
	snd_output_t *output = NULL;
	DO(snd_output_stdio_attach(&output, stdout, 0));
	DO(snd_pcm_dump(handle, output));
	printf("\n");

	printf("frames = %ld\n", (long)frames);
	short data[frames * CHANNELS];
	memset(data, 0, sizeof(data));

	printf("writing whole buffer\n");
	DO(snd_pcm_writei(handle, data, frames));
	printf("writing whole buffer\n");
	DO(snd_pcm_writei(handle, data, frames));
	printf("writing whole buffer minus 1 frame\n");
	DO(snd_pcm_writei(handle, data, frames - 1));

	printf("draining audio\n");
	DO(snd_pcm_drain(handle));
	
	printf("done\n");
	DO(snd_pcm_close(handle));
	return 0;
}