1 files changed, 130 insertions, 0 deletions
diff --git a/src/filter/plugins/AutoConvertFilterPlugin.cxx b/src/filter/plugins/AutoConvertFilterPlugin.cxx
new file mode 100644
index 000000000..8586cb86e
--- /dev/null
+++ b/src/filter/plugins/AutoConvertFilterPlugin.cxx
@@ -0,0 +1,130 @@
+/*
+ * 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 "AutoConvertFilterPlugin.hxx"
+#include "ConvertFilterPlugin.hxx"
+#include "filter/FilterPlugin.hxx"
+#include "filter/FilterInternal.hxx"
+#include "filter/FilterRegistry.hxx"
+#include "AudioFormat.hxx"
+#include "config/ConfigData.hxx"
+#include "util/ConstBuffer.hxx"
+
+#include <assert.h>
+
+class AutoConvertFilter final : public Filter {
+	/**
+	 * The underlying filter.
+	 */
+	Filter *filter;
+
+	/**
+	 * A convert_filter, just in case conversion is needed.  nullptr
+	 * if unused.
+	 */
+	Filter *convert;
+
+public:
+	AutoConvertFilter(Filter *_filter):filter(_filter) {}
+	~AutoConvertFilter() {
+		delete filter;
+	}
+
+	virtual AudioFormat Open(AudioFormat &af, Error &error) override;
+	virtual void Close() override;
+	virtual ConstBuffer<void> FilterPCM(ConstBuffer<void> src,
+					    Error &error) override;
+};
+
+AudioFormat
+AutoConvertFilter::Open(AudioFormat &in_audio_format, Error &error)
+{
+	assert(in_audio_format.IsValid());
+
+	/* open the "real" filter */
+
+	AudioFormat child_audio_format = in_audio_format;
+	AudioFormat out_audio_format = filter->Open(child_audio_format, error);
+	if (!out_audio_format.IsDefined())
+		return out_audio_format;
+
+	/* need to convert? */
+
+	if (in_audio_format != child_audio_format) {
+		/* yes - create a convert_filter */
+
+		const config_param empty;
+		convert = filter_new(&convert_filter_plugin, empty, error);
+		if (convert == nullptr) {
+			filter->Close();
+			return AudioFormat::Undefined();
+		}
+
+		AudioFormat audio_format2 = in_audio_format;
+		AudioFormat audio_format3 =
+			convert->Open(audio_format2, error);
+		if (!audio_format3.IsDefined()) {
+			delete convert;
+			filter->Close();
+			return AudioFormat::Undefined();
+		}
+
+		assert(audio_format2 == in_audio_format);
+
+		if (!convert_filter_set(convert, child_audio_format, error)) {
+			delete convert;
+			filter->Close();
+			return AudioFormat::Undefined();
+		}
+	} else
+		/* no */
+		convert = nullptr;
+
+	return out_audio_format;
+}
+
+void
+AutoConvertFilter::Close()
+{
+	if (convert != nullptr) {
+		convert->Close();
+		delete convert;
+	}
+
+	filter->Close();
+}
+
+ConstBuffer<void>
+AutoConvertFilter::FilterPCM(ConstBuffer<void> src, Error &error)
+{
+	if (convert != nullptr) {
+		src = convert->FilterPCM(src, error);
+		if (src.IsNull())
+			return nullptr;
+	}
+
+	return filter->FilterPCM(src, error);
+}
+
+Filter *
+autoconvert_filter_new(Filter *filter)
+{
+	return new AutoConvertFilter(filter);
+}