pcm/PcmConvert: move code to new class PcmFormatConverter

src/pcm/FormatConverter.cxx

@@ -0,0 +1,104 @@
+/*
+ * 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 "FormatConverter.hxx"
+#include "PcmFormat.hxx"
+#include "PcmConvert.hxx"
+#include "util/ConstBuffer.hxx"
+#include "util/Error.hxx"
+
+#include <assert.h>
+
+bool
+PcmFormatConverter::Open(SampleFormat _src_format, SampleFormat _dest_format,
+			 gcc_unused Error &error)
+{
+	assert(_src_format != SampleFormat::UNDEFINED);
+	assert(_dest_format != SampleFormat::UNDEFINED);
+
+	src_format = _src_format;
+	dest_format = _dest_format;
+	return true;
+}
+
+void
+PcmFormatConverter::Close()
+{
+#ifndef NDEBUG
+	src_format = SampleFormat::UNDEFINED;
+	dest_format = SampleFormat::UNDEFINED;
+#endif
+}
+
+ConstBuffer<void>
+PcmFormatConverter::Convert(ConstBuffer<void> src, Error &error)
+{
+	const void *result = nullptr;
+	size_t result_size = 0;
+
+	switch (dest_format) {
+	case SampleFormat::UNDEFINED:
+		assert(false);
+		gcc_unreachable();
+
+	case SampleFormat::S8:
+	case SampleFormat::DSD:
+		result = nullptr;
+		break;
+
+	case SampleFormat::S16:
+		result = pcm_convert_to_16(buffer, dither,
+					   src_format,
+					   src.data, src.size,
+					   &result_size);
+		break;
+
+	case SampleFormat::S24_P32:
+		result = pcm_convert_to_24(buffer,
+					   src_format,
+					   src.data, src.size,
+					   &result_size);
+		break;
+
+	case SampleFormat::S32:
+		result = pcm_convert_to_32(buffer,
+					   src_format,
+					   src.data, src.size,
+					   &result_size);
+		break;
+
+	case SampleFormat::FLOAT:
+		result = pcm_convert_to_float(buffer,
+					      src_format,
+					      src.data, src.size,
+					      &result_size);
+		break;
+	}
+
+	if (result == nullptr) {
+		error.Format(pcm_convert_domain,
+			     "PCM conversion from %s to %s is not implemented",
+			     sample_format_to_string(src_format),
+			     sample_format_to_string(dest_format));
+		return nullptr;
+	}
+
+	return { result, result_size };
+}