1 files changed, 141 insertions, 0 deletions
diff --git a/src/output/plugins/NullOutputPlugin.cxx b/src/output/plugins/NullOutputPlugin.cxx
new file mode 100644
index 000000000..c336d86e6
--- /dev/null
+++ b/src/output/plugins/NullOutputPlugin.cxx
@@ -0,0 +1,141 @@
+/*
+ * Copyright (C) 2003-2014 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 "NullOutputPlugin.hxx"
+#include "../OutputAPI.hxx"
+#include "Timer.hxx"
+
+struct NullOutput {
+	struct audio_output base;
+
+	bool sync;
+
+	Timer *timer;
+
+	bool Initialize(const config_param &param, Error &error) {
+		return ao_base_init(&base, &null_output_plugin, param,
+				    error);
+	}
+
+	void Deinitialize() {
+		ao_base_finish(&base);
+	}
+};
+
+static struct audio_output *
+null_init(const config_param &param, Error &error)
+{
+	NullOutput *nd = new NullOutput();
+
+	if (!nd->Initialize(param, error)) {
+		delete nd;
+		return nullptr;
+	}
+
+	nd->sync = param.GetBlockValue("sync", true);
+
+	return &nd->base;
+}
+
+static void
+null_finish(struct audio_output *ao)
+{
+	NullOutput *nd = (NullOutput *)ao;
+
+	nd->Deinitialize();
+	delete nd;
+}
+
+static bool
+null_open(struct audio_output *ao, AudioFormat &audio_format,
+	  gcc_unused Error &error)
+{
+	NullOutput *nd = (NullOutput *)ao;
+
+	if (nd->sync)
+		nd->timer = new Timer(audio_format);
+
+	return true;
+}
+
+static void
+null_close(struct audio_output *ao)
+{
+	NullOutput *nd = (NullOutput *)ao;
+
+	if (nd->sync)
+		delete nd->timer;
+}
+
+static unsigned
+null_delay(struct audio_output *ao)
+{
+	NullOutput *nd = (NullOutput *)ao;
+
+	return nd->sync && nd->timer->IsStarted()
+		? nd->timer->GetDelay()
+		: 0;
+}
+
+static size_t
+null_play(struct audio_output *ao, gcc_unused const void *chunk, size_t size,
+	  gcc_unused Error &error)
+{
+	NullOutput *nd = (NullOutput *)ao;
+	Timer *timer = nd->timer;
+
+	if (!nd->sync)
+		return size;
+
+	if (!timer->IsStarted())
+		timer->Start();
+	timer->Add(size);
+
+	return size;
+}
+
+static void
+null_cancel(struct audio_output *ao)
+{
+	NullOutput *nd = (NullOutput *)ao;
+
+	if (!nd->sync)
+		return;
+
+	nd->timer->Reset();
+}
+
+const struct audio_output_plugin null_output_plugin = {
+	"null",
+	nullptr,
+	null_init,
+	null_finish,
+	nullptr,
+	nullptr,
+	null_open,
+	null_close,
+	null_delay,
+	nullptr,
+	null_play,
+	nullptr,
+	null_cancel,
+	nullptr,
+	nullptr,
+};