Mixer v2.0 merged to the main CVS tree...

src/control/defaults.c

@@ -0,0 +1,108 @@
+/*
+ *  Control Interface - defaults
+ *  Copyright (c) 1998 by Jaroslav Kysela <perex@jcu.cz>
+ *
+ *
+ *   This library is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU Library General Public License as
+ *   published by the Free Software Foundation; either version 2 of
+ *   the License, or (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU Library General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Library General Public
+ *   License along with this library; if not, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include "asoundlib.h"
+
+static int defaults_card(const char *env)
+{
+	char *e;
+	
+	e = getenv(env);
+	if (!e)
+		return -ENOENT;
+	return snd_card_name(e);
+}
+
+static int defaults_device(const char *env)
+{
+	char *e;
+	int dev;
+
+	e = getenv(env);
+	if (e) {
+		dev = atoi(env);
+		if (dev >= 0 && dev < 1024 * 1024)
+			return dev;
+	}
+	return 0;
+}
+
+int snd_defaults_card(void)
+{
+	int result;
+	unsigned int mask;
+
+	result = defaults_card("ALSA_CARD");
+	if (result >= 0)
+		return result;
+	mask = snd_cards_mask();
+	for (result = 0; result < 31; result++)
+		if (mask & (1 << result))
+			return result;
+	return -ENOENT;
+}
+
+int snd_defaults_mixer_card(void)
+{
+	int result;
+	
+	result = defaults_card("ALSA_MIXER_CARD");
+	if (result >= 0)
+		return result;
+	return snd_defaults_card();
+}
+
+int snd_defaults_mixer_device(void)
+{
+	return defaults_device("ALSA_MIXER_DEVICE");
+}
+
+int snd_defaults_pcm_card(void)
+{
+	int result;
+	
+	result = defaults_card("ALSA_PCM_CARD");
+	if (result >= 0)
+		return result;
+	return snd_defaults_card();
+}
+
+int snd_defaults_pcm_device(void)
+{
+	return defaults_device("ALSA_PCM_DEVICE");
+}
+
+int snd_defaults_rawmidi_card(void)
+{
+	int result;
+	
+	result = defaults_card("ALSA_PCM_CARD");
+	if (result >= 0)
+		return result;
+	return snd_defaults_card();
+}
+
+int snd_defaults_rawmidi_device(void)
+{
+	return defaults_device("ALSA_RAWMIDI_DEVICE");
+}