#include <stdio.h>
#include <stdlib.h>

#include <alsa/asoundlib.h>

/**
	Vendor / Product ID
    0x1604 / 0x8001 (US428)
	0x1604 / 0x8005 (US224)
	0x1604 / 0x8007 (US122)
*/
int print_hwdep_info ( const char *name )
{
	snd_hwdep_t *hwdep = NULL;
	snd_hwdep_info_t *hwdep_info;
	int err;

	if ((err = snd_hwdep_open(&hwdep, name,
			SND_HWDEP_OPEN_READ | SND_HWDEP_OPEN_NONBLOCK)) < 0) {
		fprintf(stderr, "snd_hwdep_open(%s): %s\n", name, snd_strerror(err));
		return err;
	}

	snd_hwdep_info_alloca(&hwdep_info);
	if ((err = snd_hwdep_info(hwdep, hwdep_info)) < 0) {
		fprintf(stderr, "snd_hwdep_info(%s): %s\n", name, snd_strerror(err));
	} else {
		printf("snd_hwdep_info_get_id   (%s) = '%s'\n", name, snd_hwdep_info_get_id(hwdep_info));
		printf("snd_hwdep_info_get_name (%s) = '%s'\n", name, snd_hwdep_info_get_name(hwdep_info));
	}

	if ((err = snd_hwdep_close(hwdep)) < 0)
		fprintf(stderr, "snd_hwdep_close(%s): %s\n", name, snd_strerror(err));
	
	return err;
}

int print_pcm_info ( const char *name, int stream )
{
	snd_pcm_t *pcm;
	snd_pcm_hw_params_t *hw_params;
	unsigned int channels;
	int err;
	
	if ((err = snd_pcm_open(&pcm, name, stream, SND_PCM_NONBLOCK)) < 0) {
		fprintf(stderr, "snd_pcm_open(%s): %s\n", name, snd_strerror(err));
		return err;
	}

	snd_pcm_hw_params_alloca(&hw_params);
	if ((err = snd_pcm_hw_params_any(pcm, hw_params)) < 0) {
		fprintf(stderr, "snd_pcm_hw_params_any(%s): %s\n", name, snd_strerror(err));
	} else {
		if ((err = snd_pcm_hw_params_get_channels_min(hw_params, &channels)) < 0) {
			fprintf(stderr, "snd_pcm_hw_params_get_channels_min(%s): %s\n", name, snd_strerror(err));
		} else {
			printf("snd_pcm_hw_params_get_channels_min(%s) = %u\n", name, channels);
		}
		if ((err = snd_pcm_hw_params_get_channels_max(hw_params, &channels)) < 0) {
			fprintf(stderr, "snd_pcm_hw_params_get_channels_max(%s): %s\n", name, snd_strerror(err));
		} else {
			printf("snd_pcm_hw_params_get_channels_max(%s) = %u\n", name, channels);
		}
	}

	if ((err = snd_pcm_close(pcm)) < 0)
		fprintf(stderr, "snd_pcm_close(%s): %s\n", name, snd_strerror(err));
	
	return err;
}


int main ( int argc, char *argv[] )
{
	int i;

	for (i = 1; i < argc; ++i) {
		const char *name = argv[i];
		printf("---hwdep---\n");
		print_hwdep_info(name);
		printf("---pcm (capture)---\n");
		print_pcm_info(name, SND_PCM_STREAM_CAPTURE);
		printf("---pcm (playback)---\n");
		print_pcm_info(name, SND_PCM_STREAM_PLAYBACK);
	}
}