pcm/Pcm*: drop more "Pcm" prefixes from source file names

2019-06-17 11:10:33 +02:00
parent a139279575
commit e87f0ca771
47 changed files with 53 additions and 54 deletions
--- a/src/pcm/Dither.hxx
+++ b/src/pcm/Dither.hxx
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2003-2019 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_PCM_DITHER_HXX
+#define MPD_PCM_DITHER_HXX
+
+#include <stdint.h>
+
+enum class SampleFormat : uint8_t;
+
+class PcmDither {
+	int32_t error[3];
+	int32_t random;
+
+public:
+	constexpr PcmDither() noexcept
+		:error{0, 0, 0}, random(0) {}
+
+	/**
+	 * Shift the given sample by #SBITS-#DBITS to the right, and
+	 * apply dithering.
+	 *
+	 * @tparam ST the input sample type
+	 * @tparam SBITS the input bit width
+	 * @tparam DBITS the output bit width
+	 * @param sample the input sample value
+	 */
+	template<typename ST, unsigned SBITS, unsigned DBITS>
+	ST DitherShift(ST sample) noexcept;
+
+	void Dither24To16(int16_t *dest, const int32_t *src,
+			  const int32_t *src_end) noexcept;
+
+	void Dither32To16(int16_t *dest, const int32_t *src,
+			  const int32_t *src_end) noexcept;
+
+private:
+	/**
+	 * Shift the given sample by #scale_bits to the right, and
+	 * apply dithering.
+	 *
+	 * @param T the input sample type
+	 * @param MIN the minimum input sample value
+	 * @param MAX the maximum input sample value
+	 * @param scale_bits the number of bits to be discarded
+	 * @param sample the input sample value
+	 */
+	template<typename T, T MIN, T MAX, unsigned scale_bits>
+	T Dither(T sample) noexcept;
+
+	/**
+	 * Convert the given sample from one sample format to another,
+	 * discarding bits.
+	 *
+	 * @param ST the input #SampleTraits class
+	 * @param ST the output #SampleTraits class
+	 * @param sample the input sample value
+	 */
+	template<typename ST, typename DT>
+	typename DT::value_type DitherConvert(typename ST::value_type sample) noexcept;
+
+	template<typename ST, typename DT>
+	void DitherConvert(typename DT::pointer_type dest,
+			   typename ST::const_pointer_type src,
+			   typename ST::const_pointer_type src_end) noexcept;
+};
+
+#endif