third_party_alsa-lib/test/control.c

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

int main(void)
{
	int idx, idx1, cards, err;
	snd_ctl_t *handle;
	struct snd_ctl_hw_info info;
	snd_pcm_info_t pcminfo;
	snd_mixer_info_t mixerinfo;
	char str[128];

	cards = snd_cards();
	printf("Detected %i soundcard%s...\n", cards, cards != 1 ? "s" : "");
	if (cards <= 0) {
		printf("Giving up...\n");
		return 0;
	}
	for (idx = 0; idx < cards; idx++) {
		if ((err = snd_ctl_open(&handle, idx)) < 0) {
			printf("Open error: %s\n", snd_strerror(err));
			continue;
		}
		if ((err = snd_ctl_hw_info(handle, &info)) < 0) {
			printf("HW info error: %s\n", snd_strerror(err));
			continue;
		}
		printf("Soundcard #%i:\n", idx + 1);
		printf("  type - %i\n", info.type);
		printf("  pcm devs - %i\n", info.pcmdevs);
		printf("  mixer devs - %i\n", info.mixerdevs);
		printf("  midi devs - %i\n", info.mididevs);
		memset(str, 0, sizeof(str));
		strncpy(str, info.id, sizeof(info.id));
		printf("  id - '%s'\n", str);
		printf("  abbreviation - '%s'\n", info.abbreviation);
		printf("  name - '%s'\n", info.name);
		printf("  longname - '%s'\n", info.longname);
		for (idx1 = 0; idx1 < info.pcmdevs; idx1++) {
			printf("PCM info, device #%i:\n", idx1);
			if ((err = snd_ctl_pcm_info(handle, idx1, &pcminfo)) < 0) {
				printf("  PCM info error: %s\n", snd_strerror(err));
				continue;
			}
			printf("  type - %i\n", pcminfo.type);
			printf("  flags - 0x%x\n", pcminfo.flags);
			printf("  id - '%s'\n", pcminfo.id);
			printf("  name - '%s'\n", pcminfo.name);
			printf("  playback - %i\n", pcminfo.playback);
			printf("  capture - %i\n", pcminfo.capture);
		}
		for (idx1 = 0; idx1 < info.mixerdevs; idx1++) {
			printf("MIXER info, device #%i:\n", idx1);
			if ((err = snd_ctl_mixer_info(handle, idx1, &mixerinfo)) < 0) {
				printf("  MIXER info error: %s\n", snd_strerror(err));
				continue;
			}
			printf("  type - %i\n", mixerinfo.type);
			printf("  elements - %i\n", mixerinfo.elements);
			printf("  groups - %i\n", mixerinfo.groups);
			printf("  switches - %i\n", mixerinfo.switches);
			printf("  attrib - 0x%x\n", mixerinfo.attrib);
			printf("  id - '%s'\n", mixerinfo.id);
			printf("  name - '%s'\n", mixerinfo.name);
		}
		snd_ctl_close(handle);
	}
	return 0;
}