decoder/flac: move flac_sample_format() to FlacAudioFormat.hxx

Makefile.am

@@ -1198,6 +1198,7 @@ endif
 
 if ENABLE_FLAC
 libdecoder_a_SOURCES += \
+	src/lib/xiph/FlacAudioFormat.hxx \
 	src/lib/xiph/FlacMetadataIterator.hxx \
 	src/lib/xiph/FlacIOHandle.cxx src/lib/xiph/FlacIOHandle.hxx \
 	src/lib/xiph/FlacMetadataChain.cxx src/lib/xiph/FlacMetadataChain.hxx \

src/decoder/plugins/FlacPcm.cxx

@@ -20,37 +20,17 @@
 #include "config.h"
 #include "FlacPcm.hxx"
 #include "CheckAudioFormat.hxx"
+#include "lib/xiph/FlacAudioFormat.hxx"
 #include "util/RuntimeError.hxx"
 #include "util/ConstBuffer.hxx"
 
 #include <assert.h>
 
-static SampleFormat
-flac_sample_format(unsigned bits_per_sample)
-{
-	switch (bits_per_sample) {
-	case 8:
-		return SampleFormat::S8;
-
-	case 16:
-		return SampleFormat::S16;
-
-	case 24:
-		return SampleFormat::S24_P32;
-
-	case 32:
-		return SampleFormat::S32;
-
-	default:
-		return SampleFormat::UNDEFINED;
-	}
-}
-
 void
 FlacPcmImport::Open(unsigned sample_rate, unsigned bits_per_sample,
 		    unsigned channels)
 {
-	auto sample_format = flac_sample_format(bits_per_sample);
+	auto sample_format = FlacSampleFormat(bits_per_sample);
 	if (sample_format == SampleFormat::UNDEFINED)
 		throw FormatRuntimeError("Unsupported FLAC bit depth: %u",
 					 bits_per_sample);

src/lib/xiph/FlacAudioFormat.hxx

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2003-2018 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.
+ */
+
+#ifndef MPD_FLAC_AUDIO_FORMAT_HXX
+#define MPD_FLAC_AUDIO_FORMAT_HXX
+
+#include "pcm/SampleFormat.hxx"
+
+constexpr inline SampleFormat
+FlacSampleFormat(unsigned bits_per_sample) noexcept
+{
+	switch (bits_per_sample) {
+	case 8:
+		return SampleFormat::S8;
+
+	case 16:
+		return SampleFormat::S16;
+
+	case 24:
+		return SampleFormat::S24_P32;
+
+	case 32:
+		return SampleFormat::S32;
+
+	default:
+		return SampleFormat::UNDEFINED;
+	}
+}
+
+#endif