1 files changed, 132 insertions, 0 deletions
diff --git a/src/filter/AutoConvertFilterPlugin.cxx b/src/filter/AutoConvertFilterPlugin.cxx
new file mode 100644
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--- /dev/null
+++ b/src/filter/AutoConvertFilterPlugin.cxx
@@ -0,0 +1,132 @@
+/*
+ * 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 "AutoConvertFilterPlugin.hxx"
+#include "ConvertFilterPlugin.hxx"
+#include "FilterPlugin.hxx"
+#include "FilterInternal.hxx"
+#include "FilterRegistry.hxx"
+#include "audio_format.h"
+
+#include <assert.h>
+
+class AutoConvertFilter final : public Filter {
+	/**
+	 * The audio format being fed to the underlying filter.  This
+	 * plugin actually doesn't need this variable, we have it here
+	 * just so our open() method doesn't return a stack pointer.
+	 */
+	audio_format child_audio_format;
+
+	/**
+	 * 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 const audio_format *Open(audio_format &af, GError **error_r);
+	virtual void Close();
+	virtual const void *FilterPCM(const void *src, size_t src_size,
+				      size_t *dest_size_r, GError **error_r);
+};
+
+const struct audio_format *
+AutoConvertFilter::Open(audio_format &in_audio_format, GError **error_r)
+{
+	assert(audio_format_valid(&in_audio_format));
+
+	/* open the "real" filter */
+
+	child_audio_format = in_audio_format;
+	const audio_format *out_audio_format =
+		filter->Open(child_audio_format, error_r);
+	if (out_audio_format == nullptr)
+		return nullptr;
+
+	/* need to convert? */
+
+	if (!audio_format_equals(&child_audio_format, &in_audio_format)) {
+		/* yes - create a convert_filter */
+
+		convert = filter_new(&convert_filter_plugin, nullptr, error_r);
+		if (convert == nullptr) {
+			filter->Close();
+			return nullptr;
+		}
+
+		audio_format audio_format2 = in_audio_format;
+		const audio_format *audio_format3 =
+			convert->Open(audio_format2, error_r);
+		if (audio_format3 == nullptr) {
+			delete convert;
+			filter->Close();
+			return nullptr;
+		}
+
+		assert(audio_format_equals(&audio_format2, &in_audio_format));
+
+		convert_filter_set(convert, child_audio_format);
+	} else
+		/* no */
+		convert = nullptr;
+
+	return out_audio_format;
+}
+
+void
+AutoConvertFilter::Close()
+{
+	if (convert != nullptr) {
+		convert->Close();
+		delete convert;
+	}
+
+	filter->Close();
+}
+
+const void *
+AutoConvertFilter::FilterPCM(const void *src, size_t src_size,
+			     size_t *dest_size_r, GError **error_r)
+{
+	if (convert != nullptr) {
+		src = convert->FilterPCM(src, src_size, &src_size, error_r);
+		if (src == nullptr)
+			return nullptr;
+	}
+
+	return filter->FilterPCM(src, src_size, dest_size_r, error_r);
+}
+
+Filter *
+autoconvert_filter_new(Filter *filter)
+{
+	return new AutoConvertFilter(filter);
+}