87 lines
1.9 KiB
C
87 lines
1.9 KiB
C
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/*
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* Dither.h
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* --------
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* Purpose: Dithering when converting to lower resolution sample formats.
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* Notes : (currently none)
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* Authors: Olivier Lapicque
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* OpenMPT Devs
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* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
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*/
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#pragma once
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#include "openmpt/all/BuildSettings.hpp"
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#include "mpt/base/macros.hpp"
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#include "mpt/string/types.hpp"
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#include "openmpt/soundbase/Dither.hpp"
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#include "openmpt/soundbase/DitherModPlug.hpp"
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#include "openmpt/soundbase/DitherNone.hpp"
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#include "openmpt/soundbase/DitherSimple.hpp"
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#include "mptRandom.h"
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#include <vector>
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#include <variant>
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#include <cstddef>
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OPENMPT_NAMESPACE_BEGIN
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using Dither_Default = Dither_Simple;
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class DitherNamesOpenMPT
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{
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public:
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static mpt::ustring GetModeName(std::size_t mode)
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{
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mpt::ustring result;
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switch(mode)
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{
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case 0:
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// no dither
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result = MPT_USTRING("no");
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break;
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case 1:
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// chosen by OpenMPT code, might change
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result = MPT_USTRING("default");
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break;
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case 2:
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// rectangular, 0.5 bit depth, no noise shaping (original ModPlug Tracker)
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result = MPT_USTRING("0.5 bit");
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break;
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case 3:
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// rectangular, 1 bit depth, simple 1st order noise shaping
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result = MPT_USTRING("1 bit");
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break;
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default:
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result = MPT_USTRING("");
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break;
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}
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return result;
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}
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};
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using DithersOpenMPT =
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Dithers<std::variant<MultiChannelDither<Dither_None>, MultiChannelDither<Dither_Default>, MultiChannelDither<Dither_ModPlug>, MultiChannelDither<Dither_Simple>>, DitherNamesOpenMPT, 4, 1, 0, mpt::good_prng>;
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struct DithersWrapperOpenMPT
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: DithersOpenMPT
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{
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template <typename Trd>
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DithersWrapperOpenMPT(Trd &rd, std::size_t mode = DithersOpenMPT::DefaultDither, std::size_t channels = DithersOpenMPT::DefaultChannels)
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: DithersOpenMPT(rd, mode, channels)
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{
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return;
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}
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};
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OPENMPT_NAMESPACE_END
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