From: Jaroslav Kysela <perex@perex.cz>
Date: Tue, 12 May 2009 06:06:41 +0000 (+0200)
Subject: Extend snd_card_get_index() to accept also control device name like /dev/snd/controlC0
X-Git-Tag: v1.0.21~40
X-Git-Url: https://git.alsa-project.org/?a=commitdiff_plain;h=33ab0b5381c87e151e87e5000964edd868484886;p=alsa-lib.git

Extend snd_card_get_index() to accept also control device name like /dev/snd/controlC0

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---

diff --git a/src/control/cards.c b/src/control/cards.c
index 4d2c7394..aec823ec 100644
--- a/src/control/cards.c
+++ b/src/control/cards.c
@@ -39,27 +39,40 @@
 #define SND_FILE_LOAD		ALOAD_DEVICE_DIRECTORY "aloadC%i"
 #endif
 
-static int snd_card_load1(int card)
+static int snd_card_load2(const char *control)
 {
 	int open_dev;
+	snd_ctl_card_info_t info;
+
+	open_dev = snd_open_device(control, O_RDONLY);
+	if (open_dev >= 0) {
+		if (ioctl(open_dev, SNDRV_CTL_IOCTL_CARD_INFO, &info) < 0) {
+			int err = -errno;
+			close(open_dev);
+			return err;
+		}
+		close(open_dev);
+		return info.card;
+	} else {
+		return -errno;
+	}
+}
+
+static int snd_card_load1(int card)
+{
+	int res;
 	char control[sizeof(SND_FILE_CONTROL) + 10];
 
 	sprintf(control, SND_FILE_CONTROL, card);
-
-	open_dev = snd_open_device(control, O_RDONLY);
+	res = snd_card_load2(control);
 #ifdef SUPPORT_ALOAD
-	if (open_dev < 0) {
+	if (res < 0) {
 		char aload[sizeof(SND_FILE_LOAD) + 10];
 		sprintf(aload, SND_FILE_LOAD, card);
-		open_dev = snd_open_device(aload, O_RDONLY);
+		res = snd_card_load2(aload);
 	}
 #endif
-	if (open_dev >= 0) {
-		close (open_dev);
-		return 0;
-	} else {
-		return -errno;
-	}
+	return res;
 }
 
 /**
@@ -127,6 +140,8 @@ int snd_card_get_index(const char *string)
 			return card;
 		return err;
 	}
+	if (string[0] == '/')	/* device name */
+		return snd_card_load2(string);
 	for (card = 0; card < 32; card++) {
 #ifdef SUPPORT_ALOAD
 		if (! snd_card_load(card))