1 files changed, 119 insertions, 0 deletions
diff --git a/src/filter/ConvertFilterPlugin.cxx b/src/filter/ConvertFilterPlugin.cxx
new file mode 100644
index 00000000..2c690765
--- /dev/null
+++ b/src/filter/ConvertFilterPlugin.cxx
@@ -0,0 +1,119 @@
+/*
+ * 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 "ConvertFilterPlugin.hxx"
+#include "FilterPlugin.hxx"
+#include "FilterInternal.hxx"
+#include "FilterRegistry.hxx"
+#include "conf.h"
+#include "PcmConvert.hxx"
+#include "util/Manual.hxx"
+#include "audio_format.h"
+#include "poison.h"
+
+#include <assert.h>
+#include <string.h>
+
+class ConvertFilter final : public Filter {
+	/**
+	 * The input audio format; PCM data is passed to the filter()
+	 * method in this format.
+	 */
+	audio_format in_audio_format;
+
+	/**
+	 * The output audio format; the consumer of this plugin
+	 * expects PCM data in this format.  This defaults to
+	 * #in_audio_format, and can be set with convert_filter_set().
+	 */
+	audio_format out_audio_format;
+
+	Manual<PcmConvert> state;
+
+public:
+	void Set(const audio_format &_out_audio_format) {
+		assert(audio_format_valid(&in_audio_format));
+		assert(audio_format_valid(&out_audio_format));
+		assert(audio_format_valid(&_out_audio_format));
+
+		out_audio_format = _out_audio_format;
+	}
+
+	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);
+};
+
+static Filter *
+convert_filter_init(gcc_unused const struct config_param *param,
+		    gcc_unused GError **error_r)
+{
+	return new ConvertFilter();
+}
+
+const struct audio_format *
+ConvertFilter::Open(audio_format &audio_format, gcc_unused GError **error_r)
+{
+	assert(audio_format_valid(&audio_format));
+
+	in_audio_format = out_audio_format = audio_format;
+	state.Construct();
+
+	return &in_audio_format;
+}
+
+void
+ConvertFilter::Close()
+{
+	state.Destruct();
+
+	poison_undefined(&in_audio_format, sizeof(in_audio_format));
+	poison_undefined(&out_audio_format, sizeof(out_audio_format));
+}
+
+const void *
+ConvertFilter::FilterPCM(const void *src, size_t src_size,
+			 size_t *dest_size_r, GError **error_r)
+{
+	if (audio_format_equals(&in_audio_format, &out_audio_format)) {
+		/* optimized special case: no-op */
+		*dest_size_r = src_size;
+		return src;
+	}
+
+	return state->Convert(&in_audio_format,
+			      src, src_size,
+			      &out_audio_format, dest_size_r,
+			      error_r);
+}
+
+const struct filter_plugin convert_filter_plugin = {
+	"convert",
+	convert_filter_init,
+};
+
+void
+convert_filter_set(Filter *_filter, const audio_format &out_audio_format)
+{
+	ConvertFilter *filter = (ConvertFilter *)_filter;
+
+	filter->Set(out_audio_format);
+}