1 files changed, 119 insertions, 0 deletions
diff --git a/src/mixer/WinmmMixerPlugin.cxx b/src/mixer/WinmmMixerPlugin.cxx
new file mode 100644
index 00000000..e3b7948e
--- /dev/null
+++ b/src/mixer/WinmmMixerPlugin.cxx
@@ -0,0 +1,119 @@
+/*
+ * 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 "mixer_api.h"
+#include "output_api.h"
+#include "output/WinmmOutputPlugin.hxx"
+
+#include <mmsystem.h>
+
+#include <assert.h>
+#include <math.h>
+#include <windows.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "winmm_mixer"
+
+struct winmm_mixer {
+	struct mixer base;
+	WinmmOutput *output;
+};
+
+static inline GQuark
+winmm_mixer_quark(void)
+{
+	return g_quark_from_static_string("winmm_mixer");
+}
+
+static inline int
+winmm_volume_decode(DWORD volume)
+{
+	return lround((volume & 0xFFFF) / 655.35);
+}
+
+static inline DWORD
+winmm_volume_encode(int volume)
+{
+	int value = lround(volume * 655.35);
+	return MAKELONG(value, value);
+}
+
+static struct mixer *
+winmm_mixer_init(void *ao, G_GNUC_UNUSED const struct config_param *param,
+		 G_GNUC_UNUSED GError **error_r)
+{
+	assert(ao != nullptr);
+
+	struct winmm_mixer *wm = g_new(struct winmm_mixer, 1);
+	mixer_init(&wm->base, &winmm_mixer_plugin);
+	wm->output = (WinmmOutput *) ao;
+
+	return &wm->base;
+}
+
+static void
+winmm_mixer_finish(struct mixer *data)
+{
+	g_free(data);
+}
+
+static int
+winmm_mixer_get_volume(struct mixer *mixer, GError **error_r)
+{
+	struct winmm_mixer *wm = (struct winmm_mixer *) mixer;
+	DWORD volume;
+	HWAVEOUT handle = winmm_output_get_handle(wm->output);
+	MMRESULT result = waveOutGetVolume(handle, &volume);
+
+	if (result != MMSYSERR_NOERROR) {
+		g_set_error(error_r, 0, winmm_mixer_quark(),
+			    "Failed to get winmm volume");
+		return -1;
+	}
+
+	return winmm_volume_decode(volume);
+}
+
+static bool
+winmm_mixer_set_volume(struct mixer *mixer, unsigned volume, GError **error_r)
+{
+	struct winmm_mixer *wm = (struct winmm_mixer *) mixer;
+	DWORD value = winmm_volume_encode(volume);
+	HWAVEOUT handle = winmm_output_get_handle(wm->output);
+	MMRESULT result = waveOutSetVolume(handle, value);
+
+	if (result != MMSYSERR_NOERROR) {
+		g_set_error(error_r, 0, winmm_mixer_quark(),
+			    "Failed to set winmm volume");
+		return false;
+	}
+
+	return true;
+}
+
+const struct mixer_plugin winmm_mixer_plugin = {
+	winmm_mixer_init,
+	winmm_mixer_finish,
+	nullptr,
+	nullptr,
+	winmm_mixer_get_volume,
+	winmm_mixer_set_volume,
+	false,
+};