1 files changed, 256 insertions, 0 deletions
diff --git a/src/mixer/OssMixerPlugin.cxx b/src/mixer/OssMixerPlugin.cxx
new file mode 100644
index 000000000..bbb5b6c88
--- /dev/null
+++ b/src/mixer/OssMixerPlugin.cxx
@@ -0,0 +1,256 @@
+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "MixerInternal.hxx"
+#include "OutputAPI.hxx"
+#include "fd_util.h"
+
+#include <glib.h>
+
+#include <assert.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.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"
+
+class OssMixer : public Mixer {
+	const char *device;
+	const char *control;
+
+	int device_fd;
+	int volume_control;
+
+public:
+	OssMixer():Mixer(oss_mixer_plugin) {}
+
+	bool Configure(const config_param &param, GError **error_r);
+	bool Open(GError **error_r);
+	void Close();
+
+	int GetVolume(GError **error_r);
+	bool SetVolume(unsigned volume, GError **error_r);
+};
+
+/**
+ * The quark used for GError.domain.
+ */
+static inline GQuark
+oss_mixer_quark(void)
+{
+	return g_quark_from_static_string("oss_mixer");
+}
+
+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 (g_ascii_strncasecmp(name, labels[i], name_length) == 0 &&
+		    (labels[i][name_length] == 0 ||
+		     labels[i][name_length] == ' '))
+			return i;
+	}
+	return -1;
+}
+
+inline bool
+OssMixer::Configure(const config_param &param, GError **error_r)
+{
+	device = param.GetBlockValue("mixer_device",
+					     VOLUME_MIXER_OSS_DEFAULT);
+	control = param.GetBlockValue("mixer_control");
+
+	if (control != NULL) {
+		volume_control = oss_find_mixer(control);
+		if (volume_control < 0) {
+			g_set_error(error_r, oss_mixer_quark(), 0,
+				    "no such mixer control: %s", control);
+			return false;
+		}
+	} else
+		volume_control = SOUND_MIXER_PCM;
+
+	return true;
+}
+
+static Mixer *
+oss_mixer_init(G_GNUC_UNUSED void *ao, const config_param &param,
+	       GError **error_r)
+{
+	OssMixer *om = new OssMixer();
+
+	if (!om->Configure(param, error_r)) {
+		delete om;
+		return nullptr;
+	}
+
+	return om;
+}
+
+static void
+oss_mixer_finish(Mixer *data)
+{
+	OssMixer *om = (OssMixer *) data;
+
+	delete om;
+}
+
+void
+OssMixer::Close()
+{
+	assert(device_fd >= 0);
+
+	close(device_fd);
+}
+
+static void
+oss_mixer_close(Mixer *data)
+{
+	OssMixer *om = (OssMixer *) data;
+	om->Close();
+}
+
+inline bool
+OssMixer::Open(GError **error_r)
+{
+	device_fd = open_cloexec(device, O_RDONLY, 0);
+	if (device_fd < 0) {
+		g_set_error(error_r, oss_mixer_quark(), errno,
+			    "failed to open %s: %s",
+			    device, g_strerror(errno));
+		return false;
+	}
+
+	if (control) {
+		int devmask = 0;
+
+		if (ioctl(device_fd, SOUND_MIXER_READ_DEVMASK, &devmask) < 0) {
+			g_set_error(error_r, oss_mixer_quark(), errno,
+				    "READ_DEVMASK failed: %s",
+				    g_strerror(errno));
+			Close();
+			return false;
+		}
+
+		if (((1 << volume_control) & devmask) == 0) {
+			g_set_error(error_r, oss_mixer_quark(), 0,
+				    "mixer control \"%s\" not usable",
+				    control);
+			Close();
+			return false;
+		}
+	}
+
+	return true;
+}
+
+static bool
+oss_mixer_open(Mixer *data, GError **error_r)
+{
+	OssMixer *om = (OssMixer *) data;
+
+	return om->Open(error_r);
+}
+
+inline int
+OssMixer::GetVolume(GError **error_r)
+{
+	int left, right, level;
+	int ret;
+
+	assert(device_fd >= 0);
+
+	ret = ioctl(device_fd, MIXER_READ(volume_control), &level);
+	if (ret < 0) {
+		g_set_error(error_r, oss_mixer_quark(), errno,
+			    "failed to read OSS volume: %s",
+			    g_strerror(errno));
+		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);
+	}
+
+	return left;
+}
+
+static int
+oss_mixer_get_volume(Mixer *mixer, GError **error_r)
+{
+	OssMixer *om = (OssMixer *)mixer;
+	return om->GetVolume(error_r);
+}
+
+inline bool
+OssMixer::SetVolume(unsigned volume, GError **error_r)
+{
+	int level;
+	int ret;
+
+	assert(device_fd >= 0);
+	assert(volume <= 100);
+
+	level = (volume << 8) + volume;
+
+	ret = ioctl(device_fd, MIXER_WRITE(volume_control), &level);
+	if (ret < 0) {
+		g_set_error(error_r, oss_mixer_quark(), errno,
+			    "failed to set OSS volume: %s",
+			    g_strerror(errno));
+		return false;
+	}
+
+	return true;
+}
+
+static bool
+oss_mixer_set_volume(Mixer *mixer, unsigned volume, GError **error_r)
+{
+	OssMixer *om = (OssMixer *)mixer;
+	return om->SetVolume(volume, error_r);
+}
+
+const struct mixer_plugin oss_mixer_plugin = {
+	oss_mixer_init,
+	oss_mixer_finish,
+	oss_mixer_open,
+	oss_mixer_close,
+	oss_mixer_get_volume,
+	oss_mixer_set_volume,
+	true,
+};