115 lines
2.6 KiB
C++
115 lines
2.6 KiB
C++
// Copyright 2016 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <algorithm>
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#include <array>
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#include <cstddef>
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#include "audio_core/hle/common.h"
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#include "audio_core/hle/filter.h"
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#include "audio_core/hle/shared_memory.h"
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#include "common/common_types.h"
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namespace AudioCore::HLE {
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void SourceFilters::Reset() {
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Enable(false, false);
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}
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void SourceFilters::Enable(bool simple, bool biquad) {
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simple_filter_enabled = simple;
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biquad_filter_enabled = biquad;
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if (!simple)
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simple_filter.Reset();
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if (!biquad)
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biquad_filter.Reset();
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}
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void SourceFilters::Configure(SourceConfiguration::Configuration::SimpleFilter config) {
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simple_filter.Configure(config);
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}
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void SourceFilters::Configure(SourceConfiguration::Configuration::BiquadFilter config) {
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biquad_filter.Configure(config);
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}
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void SourceFilters::ProcessFrame(StereoFrame16& frame) {
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if (!simple_filter_enabled && !biquad_filter_enabled)
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return;
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if (simple_filter_enabled) {
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FilterFrame(frame, simple_filter);
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}
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if (biquad_filter_enabled) {
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FilterFrame(frame, biquad_filter);
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}
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}
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// SimpleFilter
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void SourceFilters::SimpleFilter::Reset() {
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y1.fill(0);
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// Configure as passthrough.
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a1 = 0;
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b0 = 1 << 15;
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}
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void SourceFilters::SimpleFilter::Configure(
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SourceConfiguration::Configuration::SimpleFilter config) {
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a1 = config.a1;
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b0 = config.b0;
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}
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std::array<s16, 2> SourceFilters::SimpleFilter::ProcessSample(const std::array<s16, 2>& x0) {
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std::array<s16, 2> y0;
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for (std::size_t i = 0; i < 2; i++) {
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const s32 tmp = (b0 * x0[i] + a1 * y1[i]) >> 15;
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y0[i] = std::clamp(tmp, -32768, 32767);
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}
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y1 = y0;
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return y0;
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}
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// BiquadFilter
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void SourceFilters::BiquadFilter::Reset() {
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x1.fill(0);
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x2.fill(0);
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y1.fill(0);
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y2.fill(0);
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// Configure as passthrough.
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a1 = a2 = b1 = b2 = 0;
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b0 = 1 << 14;
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}
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void SourceFilters::BiquadFilter::Configure(
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SourceConfiguration::Configuration::BiquadFilter config) {
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a1 = config.a1;
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a2 = config.a2;
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b0 = config.b0;
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b1 = config.b1;
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b2 = config.b2;
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}
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std::array<s16, 2> SourceFilters::BiquadFilter::ProcessSample(const std::array<s16, 2>& x0) {
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std::array<s16, 2> y0;
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for (std::size_t i = 0; i < 2; i++) {
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const s32 tmp = (b0 * x0[i] + b1 * x1[i] + b2 * x2[i] + a1 * y1[i] + a2 * y2[i]) >> 14;
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y0[i] = std::clamp(tmp, -32768, 32767);
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}
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x2 = x1;
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x1 = x0;
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y2 = y1;
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y1 = y0;
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return y0;
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}
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} // namespace AudioCore::HLE
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