1 files changed, 238 insertions, 0 deletions
diff --git a/src/mixer/PulseMixerPlugin.cxx b/src/mixer/PulseMixerPlugin.cxx
new file mode 100644
index 000000000..65dbc01fe
--- /dev/null
+++ b/src/mixer/PulseMixerPlugin.cxx
@@ -0,0 +1,238 @@
+/*
+ * 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 "PulseMixerPlugin.h"
+#include "mixer_api.h"
+#include "output/pulse_output_plugin.h"
+#include "conf.h"
+#include "GlobalEvents.hxx"
+
+#include <glib.h>
+
+#include <pulse/thread-mainloop.h>
+#include <pulse/context.h>
+#include <pulse/introspect.h>
+#include <pulse/stream.h>
+#include <pulse/subscribe.h>
+#include <pulse/error.h>
+
+#include <assert.h>
+#include <string.h>
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "pulse_mixer"
+
+struct pulse_mixer {
+	struct mixer base;
+
+	struct pulse_output *output;
+
+	bool online;
+	struct pa_cvolume volume;
+
+};
+
+/**
+ * The quark used for GError.domain.
+ */
+static inline GQuark
+pulse_mixer_quark(void)
+{
+	return g_quark_from_static_string("pulse_mixer");
+}
+
+static void
+pulse_mixer_offline(struct pulse_mixer *pm)
+{
+	if (!pm->online)
+		return;
+
+	pm->online = false;
+
+	GlobalEvents::Emit(GlobalEvents::MIXER);
+}
+
+/**
+ * Callback invoked by pulse_mixer_update().  Receives the new mixer
+ * value.
+ */
+static void
+pulse_mixer_volume_cb(G_GNUC_UNUSED pa_context *context, const pa_sink_input_info *i,
+		      int eol, void *userdata)
+{
+	struct pulse_mixer *pm = (struct pulse_mixer *)userdata;
+
+	if (eol)
+		return;
+
+	if (i == NULL) {
+		pulse_mixer_offline(pm);
+		return;
+	}
+
+	pm->online = true;
+	pm->volume = i->volume;
+
+	GlobalEvents::Emit(GlobalEvents::MIXER);
+}
+
+static void
+pulse_mixer_update(struct pulse_mixer *pm,
+		   struct pa_context *context, struct pa_stream *stream)
+{
+	pa_operation *o;
+
+	assert(context != NULL);
+	assert(stream != NULL);
+	assert(pa_stream_get_state(stream) == PA_STREAM_READY);
+
+	o = pa_context_get_sink_input_info(context,
+					   pa_stream_get_index(stream),
+					   pulse_mixer_volume_cb, pm);
+	if (o == NULL) {
+		g_warning("pa_context_get_sink_input_info() failed: %s",
+			  pa_strerror(pa_context_errno(context)));
+		pulse_mixer_offline(pm);
+		return;
+	}
+
+	pa_operation_unref(o);
+}
+
+void
+pulse_mixer_on_connect(G_GNUC_UNUSED struct pulse_mixer *pm,
+		       struct pa_context *context)
+{
+	pa_operation *o;
+
+	assert(context != NULL);
+
+	o = pa_context_subscribe(context,
+				 (pa_subscription_mask_t)PA_SUBSCRIPTION_MASK_SINK_INPUT,
+				 NULL, NULL);
+	if (o == NULL) {
+		g_warning("pa_context_subscribe() failed: %s",
+			  pa_strerror(pa_context_errno(context)));
+		return;
+	}
+
+	pa_operation_unref(o);
+}
+
+void
+pulse_mixer_on_disconnect(struct pulse_mixer *pm)
+{
+	pulse_mixer_offline(pm);
+}
+
+void
+pulse_mixer_on_change(struct pulse_mixer *pm,
+		      struct pa_context *context, struct pa_stream *stream)
+{
+	pulse_mixer_update(pm, context, stream);
+}
+
+static struct mixer *
+pulse_mixer_init(void *ao, G_GNUC_UNUSED const struct config_param *param,
+		 GError **error_r)
+{
+	struct pulse_output *po = (struct pulse_output *)ao;
+
+	if (ao == NULL) {
+		g_set_error(error_r, pulse_mixer_quark(), 0,
+			    "The pulse mixer cannot work without the audio output");
+		return nullptr;
+	}
+
+	struct pulse_mixer *pm = g_new(struct pulse_mixer,1);
+	mixer_init(&pm->base, &pulse_mixer_plugin);
+
+	pm->online = false;
+	pm->output = po;
+
+	pulse_output_set_mixer(po, pm);
+
+	return &pm->base;
+}
+
+static void
+pulse_mixer_finish(struct mixer *data)
+{
+	struct pulse_mixer *pm = (struct pulse_mixer *) data;
+
+	pulse_output_clear_mixer(pm->output, pm);
+
+	/* free resources */
+
+	g_free(pm);
+}
+
+static int
+pulse_mixer_get_volume(struct mixer *mixer, G_GNUC_UNUSED GError **error_r)
+{
+	struct pulse_mixer *pm = (struct pulse_mixer *) mixer;
+	int ret;
+
+	pulse_output_lock(pm->output);
+
+	ret = pm->online
+		? (int)((100*(pa_cvolume_avg(&pm->volume)+1))/PA_VOLUME_NORM)
+		: -1;
+
+	pulse_output_unlock(pm->output);
+
+	return ret;
+}
+
+static bool
+pulse_mixer_set_volume(struct mixer *mixer, unsigned volume, GError **error_r)
+{
+	struct pulse_mixer *pm = (struct pulse_mixer *) mixer;
+	struct pa_cvolume cvolume;
+	bool success;
+
+	pulse_output_lock(pm->output);
+
+	if (!pm->online) {
+		pulse_output_unlock(pm->output);
+		g_set_error(error_r, pulse_mixer_quark(), 0, "disconnected");
+		return false;
+	}
+
+	pa_cvolume_set(&cvolume, pm->volume.channels,
+		       (pa_volume_t)volume * PA_VOLUME_NORM / 100 + 0.5);
+	success = pulse_output_set_volume(pm->output, &cvolume, error_r);
+	if (success)
+		pm->volume = cvolume;
+
+	pulse_output_unlock(pm->output);
+
+	return success;
+}
+
+const struct mixer_plugin pulse_mixer_plugin = {
+	pulse_mixer_init,
+	pulse_mixer_finish,
+	nullptr,
+	nullptr,
+	pulse_mixer_get_volume,
+	pulse_mixer_set_volume,
+	false,
+};