C++ (Cpp) snd_hwdep_info_set_device Examples

Example #1

File: alsa_usb.c Project: andyvand/LIRC

static const char* search_device(void)
{
	int card, err;
	snd_hwdep_info_t* info;

	snd_hwdep_info_alloca(&info);
	card = -1;
	while (snd_card_next(&card) >= 0 && card >= 0) {
		char ctl_name[20];
		snd_ctl_t* ctl;
		int device;

		sprintf(ctl_name, "hw:CARD=%d", card);
		err = snd_ctl_open(&ctl, ctl_name, SND_CTL_NONBLOCK);
		if (err < 0)
			continue;
		device = -1;
		while (snd_ctl_hwdep_next_device(ctl, &device) >= 0 && device >= 0) {
			snd_hwdep_info_set_device(info, device);
			err = snd_ctl_hwdep_info(ctl, info);
			if (err >= 0 && snd_hwdep_info_get_iface(info) == SND_HWDEP_IFACE_SB_RC) {
				static char name[36];

				sprintf(name, "hw:CARD=%d,DEV=%d", card, device);
				snd_ctl_close(ctl);
				return name;
			}
		}
		snd_ctl_close(ctl);
	}
	return NULL;
}

Example #2

static int find_hwdep_device(int *cardP, int *devP)
{
	snd_ctl_t *ctl_handle;
	snd_ctl_card_info_t *card_info;
	snd_hwdep_info_t *hwdep_info;

	int card;
	int dev;
	int err;
	char card_id[32];

	ctl_handle = NULL;

	snd_ctl_card_info_alloca(&card_info);
	snd_hwdep_info_alloca(&hwdep_info);

	for (card = 0; card < 7; card++) {
		*cardP = card;

		if (ctl_handle) {
			snd_ctl_close(ctl_handle);
			ctl_handle = NULL;
		}
		// Get control handle for selected card
		sprintf(card_id, "hw:%i", card);
		if ((err = snd_ctl_open(&ctl_handle, card_id, 0)) < 0) {
			fprintf(stderr, "control open (%s): %s", card_id, snd_strerror(err));
			return -1;
		}
		// Read control hardware info from card
		if ((err = snd_ctl_card_info(ctl_handle, card_info)) < 0) {
			fprintf(stderr, "control hardware info (%s): %s", card_id, snd_strerror(err));
			continue;
		}
		//if (strcmp(snd_ctl_card_info_get_driver(card_info),"BT SCO (d)"))
		//    continue;
		dev = -1;
		err = 1;
		while (1) {
			int if_type;
			if (snd_ctl_hwdep_next_device(ctl_handle, &dev) < 0)
				fprintf(stderr, "hwdep next device (%s): %s", card_id, snd_strerror(err));
			if (dev < 0) 
				break;
			snd_hwdep_info_set_device(hwdep_info, dev);
			if (snd_ctl_hwdep_info(ctl_handle, hwdep_info) < 0) {
				if (err != -ENOENT)
					fprintf(stderr, "control hwdep info (%s): %s", card_id, snd_strerror(err));
				continue;
			}
			if_type = snd_hwdep_info_get_iface(hwdep_info);
			if (if_type == SNDRV_HWDEP_IFACE_BT_SCO || if_type==12) {
				snd_ctl_close(ctl_handle);
				*devP = dev;
				return 0;
			}
		}
	}
	if (ctl_handle)
		snd_ctl_close(ctl_handle);

	return -1;
}