From 9a70c4d06d51cca24dfb93847d1f82187d454e31 Mon Sep 17 00:00:00 2001
From: Viliam Mateicka <viliam.mateicka@gmail.com>
Date: Wed, 31 Dec 2008 16:46:41 +0100
Subject: Moving mixers to audio outputs

---
 src/mixer/oss_mixer.c | 197 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 197 insertions(+)
 create mode 100644 src/mixer/oss_mixer.c

(limited to 'src/mixer/oss_mixer.c')

diff --git a/src/mixer/oss_mixer.c b/src/mixer/oss_mixer.c
new file mode 100644
index 000000000..ca4027f75
--- /dev/null
+++ b/src/mixer/oss_mixer.c
@@ -0,0 +1,197 @@
+
+#include <glib.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "../output_api.h"
+#include "../mixer.h"
+
+#if defined(__OpenBSD__) || defined(__NetBSD__)
+# include <soundcard.h>
+#else /* !(defined(__OpenBSD__) || defined(__NetBSD__) */
+# include <sys/soundcard.h>
+#endif /* !(defined(__OpenBSD__) || defined(__NetBSD__) */
+
+#define VOLUME_MIXER_OSS_DEFAULT		"/dev/mixer"
+
+struct oss_mixer {
+	const char *device;
+	const char *control;
+	int device_fd;
+	int volume_control;
+};
+
+struct oss_mixer *oss_mixer_init(void);
+void oss_mixer_finish(struct oss_mixer *am);
+void oss_mixer_configure(struct oss_mixer *am, ConfigParam *param);
+bool oss_mixer_open(struct oss_mixer *am);
+bool oss_mixer_control(struct oss_mixer *am, int cmd, void *arg);
+void oss_mixer_close(struct oss_mixer *am);
+
+struct oss_mixer *
+oss_mixer_init(void)
+{
+	struct oss_mixer *om = g_malloc(sizeof(struct oss_mixer));
+	om->device = NULL;
+	om->control = NULL;
+	om->device_fd = -1;
+	om->volume_control = SOUND_MIXER_PCM;
+	return om;
+}
+
+void
+oss_mixer_finish(struct oss_mixer *om)
+{
+	g_free(om);
+}
+
+void
+oss_mixer_configure(struct oss_mixer *om, ConfigParam *param)
+{
+	BlockParam *bp;
+	bp = getBlockParam(param, "mix_device");
+	if (bp) {
+		om->device = bp->value;
+	}
+	bp = getBlockParam(param, "mix_control");
+	if (bp) {
+		om->control = bp->value;
+	}
+}
+
+void
+oss_mixer_close(struct oss_mixer *om)
+{
+	if (om->device_fd != -1)
+		while (close(om->device_fd) && errno == EINTR) ;
+	om->device_fd = -1;
+}
+
+static int
+oss_find_mixer(const char *name)
+{
+	const char *labels[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_LABELS;
+	size_t name_length = strlen(name);
+
+	for (unsigned i = 0; i < SOUND_MIXER_NRDEVICES; i++) {
+		if (strncasecmp(name, labels[i], name_length) == 0 &&
+		    (labels[i][name_length] == 0 ||
+		     labels[i][name_length] == ' '))
+			return i;
+	}
+	return -1;
+}
+
+bool
+oss_mixer_open(struct oss_mixer *om)
+{
+	const char *device = VOLUME_MIXER_OSS_DEFAULT;
+
+	if (om->device) {
+		device = om->device;
+	}
+
+	if ((om->device_fd = open(device, O_RDONLY)) < 0) {
+		g_warning("Unable to open oss mixer \"%s\"\n", device);
+		return false;
+	}
+
+	if (om->control) {
+		int i;
+		int devmask = 0;
+
+		if (ioctl(om->device_fd, SOUND_MIXER_READ_DEVMASK, &devmask) < 0) {
+			g_warning("errors getting read_devmask for oss mixer\n");
+			oss_mixer_close(om);
+			return false;
+		}
+		i = oss_find_mixer(om->control);
+
+		if (i < 0) {
+			g_warning("mixer control \"%s\" not found\n",
+				om->control);
+			oss_mixer_close(om);
+			return false;
+		} else if (!((1 << i) & devmask)) {
+			g_warning("mixer control \"%s\" not usable\n",
+				om->control);
+			oss_mixer_close(om);
+			return false;
+		}
+		om->volume_control = i;
+	}
+	return true;
+}
+
+bool
+oss_mixer_control(struct oss_mixer *om, int cmd, void *arg)
+{
+	switch (cmd) {
+	case AC_MIXER_CONFIGURE:
+		oss_mixer_configure(om, (ConfigParam *)arg);
+		//if (om->device_fd >= 0)
+			oss_mixer_close(om);
+		return true;
+		break;
+	case AC_MIXER_GETVOL:
+	{
+		int left, right, level;
+		int *ret;
+
+		if (om->device_fd < 0 && !oss_mixer_open(om)) {
+			return false;
+		}
+
+		if (ioctl(om->device_fd, MIXER_READ(om->volume_control), &level) < 0) {
+			oss_mixer_close(om);
+			g_warning("unable to read oss volume\n");
+			return false;
+		}
+
+		left = level & 0xff;
+		right = (level & 0xff00) >> 8;
+
+		if (left != right) {
+			g_warning("volume for left and right is not the same, \"%i\" and "
+				"\"%i\"\n", left, right);
+		}
+		ret = (int *) arg;
+		*ret = left;
+		return true;
+	}
+	case AC_MIXER_SETVOL:
+	{
+		int new;
+		int level;
+		int *value = arg;
+
+		if (om->device_fd < 0 && !oss_mixer_open(om)) {
+			return false;
+		}
+
+		new = *value;
+		if (new < 0) {
+			new = 0;
+		} else if (new > 100) {
+			new = 100;
+		}
+
+		level = (new << 8) + new;
+
+		if (ioctl(om->device_fd, MIXER_WRITE(om->volume_control), &level) < 0) {
+			g_warning("unable to set oss volume\n");
+			oss_mixer_close(om);
+			return false;
+		}
+		return true;
+	}
+	default:
+		g_warning("Unsuported oss control\n");
+		break;
+	}
+	return false;
+}
-- 
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