1 files changed, 129 insertions, 0 deletions
diff --git a/src/output/null_output_plugin.c b/src/output/null_output_plugin.c
new file mode 100644
index 000000000..9d7588fff
--- /dev/null
+++ b/src/output/null_output_plugin.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2003-2011 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 "null_output_plugin.h"
+#include "output_api.h"
+#include "timer.h"
+
+#include <glib.h>
+
+#include <assert.h>
+
+struct null_data {
+	struct audio_output base;
+
+	bool sync;
+
+	struct timer *timer;
+};
+
+static struct audio_output *
+null_init(const struct config_param *param, GError **error_r)
+{
+	struct null_data *nd = g_new(struct null_data, 1);
+
+	if (!ao_base_init(&nd->base, &null_output_plugin, param, error_r)) {
+		g_free(nd);
+		return NULL;
+	}
+
+	nd->sync = config_get_block_bool(param, "sync", true);
+
+	return &nd->base;
+}
+
+static void
+null_finish(struct audio_output *ao)
+{
+	struct null_data *nd = (struct null_data *)ao;
+
+	ao_base_finish(&nd->base);
+	g_free(nd);
+}
+
+static bool
+null_open(struct audio_output *ao, struct audio_format *audio_format,
+	  G_GNUC_UNUSED GError **error)
+{
+	struct null_data *nd = (struct null_data *)ao;
+
+	if (nd->sync)
+		nd->timer = timer_new(audio_format);
+
+	return true;
+}
+
+static void
+null_close(struct audio_output *ao)
+{
+	struct null_data *nd = (struct null_data *)ao;
+
+	if (nd->sync)
+		timer_free(nd->timer);
+}
+
+static unsigned
+null_delay(struct audio_output *ao)
+{
+	struct null_data *nd = (struct null_data *)ao;
+
+	return nd->sync && nd->timer->started
+		? timer_delay(nd->timer)
+		: 0;
+}
+
+static size_t
+null_play(struct audio_output *ao, G_GNUC_UNUSED const void *chunk, size_t size,
+	  G_GNUC_UNUSED GError **error)
+{
+	struct null_data *nd = (struct null_data *)ao;
+	struct timer *timer = nd->timer;
+
+	if (!nd->sync)
+		return size;
+
+	if (!timer->started)
+		timer_start(timer);
+	timer_add(timer, size);
+
+	return size;
+}
+
+static void
+null_cancel(struct audio_output *ao)
+{
+	struct null_data *nd = (struct null_data *)ao;
+
+	if (!nd->sync)
+		return;
+
+	timer_reset(nd->timer);
+}
+
+const struct audio_output_plugin null_output_plugin = {
+	.name = "null",
+	.init = null_init,
+	.finish = null_finish,
+	.open = null_open,
+	.close = null_close,
+	.delay = null_delay,
+	.play = null_play,
+	.cancel = null_cancel,
+};