134 lines
4.2 KiB
C++
134 lines
4.2 KiB
C++
// Copyright (c) 2019, Paul Ferrand
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// All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this
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// list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#pragma once
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#include <absl/types/optional.h>
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#include <absl/strings/string_view.h>
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//#include <string>
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#include <array>
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#include <cmath>
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#include "Config.h"
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namespace sfz
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{
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using SfzCCArray = std::array<uint8_t, config::numCCs>;
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using CCValuePair = std::pair<uint8_t, float> ;
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using CCNamePair = std::pair<uint8_t, std::string>;
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/**
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* @brief Converts cents to a pitch ratio
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*
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* @tparam T
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* @param cents
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* @param centsPerOctave
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* @return constexpr float
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*/
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template<class T>
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constexpr float centsFactor(T cents, T centsPerOctave = 1200)
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{
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return std::pow(2.0f, static_cast<float>(cents) / centsPerOctave);
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}
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/**
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* @brief Normalize a CC value between (T)0.0 and (T)1.0
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*
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* @tparam T
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* @param ccValue
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* @return constexpr float
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*/
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template<class T>
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constexpr float normalizeCC(T ccValue)
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{
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static_assert(std::is_integral<T>::value, "Requires an integral T");
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return static_cast<float>(std::min(std::max(ccValue, static_cast<T>(0)), static_cast<T>(127))) / 127.0f;
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}
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/**
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* @brief Normalize a percentage between 0 and 1
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*
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* @tparam T
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* @param percentValue
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* @return constexpr float
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*/
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template<class T>
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constexpr float normalizePercents(T percentValue)
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{
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return std::min(std::max(static_cast<float>(percentValue), 0.0f), 100.0f) / 100.0f;
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}
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/**
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* @brief Normalize bends between -1 and 1. We clamp to 8191 instead of 8192 in the low end
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* to have something symmetric with respect to 0.
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*
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* @param bendValue
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* @return constexpr float
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*/
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constexpr float normalizeBend(int bendValue)
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{
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return std::min(std::max(static_cast<float>(bendValue), -8191.0f), 8191.0f) / 8191.0f;
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}
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/**
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* @brief Normalize a possibly negative percentage between -1 and 1
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*
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* @tparam T
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* @param percentValue
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* @return constexpr float
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*/
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template<class T>
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constexpr float normalizeNegativePercents(T percentValue)
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{
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return std::min(std::max(static_cast<float>(percentValue), -100.0f), 100.0f) / 100.0f;
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}
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/**
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* @brief If a cc switch exists for the value, returns the value with the CC modifier, otherwise returns the value alone.
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*
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* @param ccValues
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* @param ccSwitch
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* @param value
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* @return float
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*/
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inline float ccSwitchedValue(const SfzCCArray& ccValues, const absl::optional<CCValuePair>& ccSwitch, float value) noexcept
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{
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if (ccSwitch)
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return value + ccSwitch->second * normalizeCC(ccValues[ccSwitch->first]);
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else
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return value;
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}
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/**
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* @brief Convert a note in string to its equivalent midi note number
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*
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* @param value
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* @return absl::optional<uint8_t>
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*/
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absl::optional<uint8_t> readNoteValue(const absl::string_view& value);
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bool findHeader(absl::string_view& source, absl::string_view& header, absl::string_view& members);
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bool findOpcode(absl::string_view& source, absl::string_view& opcode, absl::string_view& value);
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bool findDefine(absl::string_view line, absl::string_view& variable, absl::string_view& value);
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bool findInclude(absl::string_view line, std::string& path);
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} // namespace sfz
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