1 files changed, 145 insertions, 0 deletions
diff --git a/src/filter/plugins/ConvertFilterPlugin.cxx b/src/filter/plugins/ConvertFilterPlugin.cxx
new file mode 100644
index 000000000..5c6a07ba1
--- /dev/null
+++ b/src/filter/plugins/ConvertFilterPlugin.cxx
@@ -0,0 +1,145 @@
+/*
+ * 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 "ConvertFilterPlugin.hxx"
+#include "filter/FilterPlugin.hxx"
+#include "filter/FilterInternal.hxx"
+#include "filter/FilterRegistry.hxx"
+#include "pcm/PcmConvert.hxx"
+#include "util/Manual.hxx"
+#include "util/ConstBuffer.hxx"
+#include "AudioFormat.hxx"
+#include "poison.h"
+
+#include <assert.h>
+
+class ConvertFilter final : public Filter {
+	/**
+	 * The input audio format; PCM data is passed to the filter()
+	 * method in this format.
+	 */
+	AudioFormat in_audio_format;
+
+	/**
+	 * The output audio format; the consumer of this plugin
+	 * expects PCM data in this format.
+	 *
+	 * If this is AudioFormat::Undefined(), then the #PcmConvert
+	 * attribute is not open.  This can mean that Set() has failed
+	 * or that no conversion is necessary.
+	 */
+	AudioFormat out_audio_format;
+
+	Manual<PcmConvert> state;
+
+public:
+	bool Set(const AudioFormat &_out_audio_format, Error &error);
+
+	virtual AudioFormat Open(AudioFormat &af, Error &error) override;
+	virtual void Close() override;
+	virtual ConstBuffer<void> FilterPCM(ConstBuffer<void> src,
+					    Error &error) override;
+};
+
+static Filter *
+convert_filter_init(gcc_unused const config_param &param,
+		    gcc_unused Error &error)
+{
+	return new ConvertFilter();
+}
+
+bool
+ConvertFilter::Set(const AudioFormat &_out_audio_format, Error &error)
+{
+	assert(in_audio_format.IsValid());
+	assert(_out_audio_format.IsValid());
+
+	if (_out_audio_format == out_audio_format)
+		/* no change */
+		return true;
+
+	if (out_audio_format.IsValid()) {
+		out_audio_format.Clear();
+		state->Close();
+	}
+
+	if (_out_audio_format == in_audio_format)
+		/* optimized special case: no-op */
+		return true;
+
+	if (!state->Open(in_audio_format, _out_audio_format, error))
+		return false;
+
+	out_audio_format = _out_audio_format;
+	return true;
+}
+
+AudioFormat
+ConvertFilter::Open(AudioFormat &audio_format, gcc_unused Error &error)
+{
+	assert(audio_format.IsValid());
+
+	in_audio_format = audio_format;
+	out_audio_format.Clear();
+
+	state.Construct();
+
+	return in_audio_format;
+}
+
+void
+ConvertFilter::Close()
+{
+	assert(in_audio_format.IsValid());
+
+	if (out_audio_format.IsValid())
+		state->Close();
+
+	state.Destruct();
+
+	poison_undefined(&in_audio_format, sizeof(in_audio_format));
+	poison_undefined(&out_audio_format, sizeof(out_audio_format));
+}
+
+ConstBuffer<void>
+ConvertFilter::FilterPCM(ConstBuffer<void> src, Error &error)
+{
+	assert(in_audio_format.IsValid());
+
+	if (!out_audio_format.IsValid())
+		/* optimized special case: no-op */
+		return src;
+
+	return state->Convert(src, error);
+}
+
+const struct filter_plugin convert_filter_plugin = {
+	"convert",
+	convert_filter_init,
+};
+
+bool
+convert_filter_set(Filter *_filter, AudioFormat out_audio_format,
+		   Error &error)
+{
+	ConvertFilter *filter = (ConvertFilter *)_filter;
+
+	return filter->Set(out_audio_format, error);
+}