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Merge pull request #1572 from MerryMage/audio-filter
DSP: Implement audio filters (simple, biquad)
This commit is contained in:
commit
644fbbeb13
@ -2,13 +2,16 @@ set(SRCS
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audio_core.cpp
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codec.cpp
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hle/dsp.cpp
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hle/filter.cpp
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hle/pipe.cpp
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)
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set(HEADERS
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audio_core.h
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codec.h
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hle/common.h
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hle/dsp.h
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hle/filter.h
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hle/pipe.h
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sink.h
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)
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35
src/audio_core/hle/common.h
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35
src/audio_core/hle/common.h
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@ -0,0 +1,35 @@
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// 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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#pragma once
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#include <algorithm>
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#include <array>
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#include "audio_core/audio_core.h"
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#include "common/common_types.h"
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namespace DSP {
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namespace HLE {
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/// The final output to the speakers is stereo. Preprocessing output in Source is also stereo.
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using StereoFrame16 = std::array<std::array<s16, 2>, AudioCore::samples_per_frame>;
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/// The DSP is quadraphonic internally.
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using QuadFrame32 = std::array<std::array<s32, 4>, AudioCore::samples_per_frame>;
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/**
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* This performs the filter operation defined by FilterT::ProcessSample on the frame in-place.
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* FilterT::ProcessSample is called sequentially on the samples.
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*/
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template<typename FrameT, typename FilterT>
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void FilterFrame(FrameT& frame, FilterT& filter) {
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std::transform(frame.begin(), frame.end(), frame.begin(), [&filter](const typename FrameT::value_type& sample) {
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return filter.ProcessSample(sample);
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});
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}
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} // namespace HLE
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} // namespace DSP
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@ -126,8 +126,11 @@ struct SourceConfiguration {
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union {
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u32_le dirty_raw;
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BitField<0, 1, u32_le> format_dirty;
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BitField<1, 1, u32_le> mono_or_stereo_dirty;
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BitField<2, 1, u32_le> adpcm_coefficients_dirty;
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BitField<3, 1, u32_le> partial_embedded_buffer_dirty; ///< Tends to be set when a looped buffer is queued.
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BitField<4, 1, u32_le> partial_reset_flag;
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BitField<16, 1, u32_le> enable_dirty;
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BitField<17, 1, u32_le> interpolation_dirty;
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@ -143,8 +146,7 @@ struct SourceConfiguration {
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BitField<27, 1, u32_le> gain_2_dirty;
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BitField<28, 1, u32_le> sync_dirty;
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BitField<29, 1, u32_le> reset_flag;
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BitField<31, 1, u32_le> embedded_buffer_dirty;
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BitField<30, 1, u32_le> embedded_buffer_dirty;
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};
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// Gain control
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@ -175,7 +177,8 @@ struct SourceConfiguration {
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/**
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* This is the simplest normalized first-order digital recursive filter.
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* The transfer function of this filter is:
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* H(z) = b0 / (1 + a1 z^-1)
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* H(z) = b0 / (1 - a1 z^-1)
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* Note the feedbackward coefficient is negated.
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* Values are signed fixed point with 15 fractional bits.
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*/
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struct SimpleFilter {
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@ -192,11 +195,11 @@ struct SourceConfiguration {
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* Values are signed fixed point with 14 fractional bits.
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*/
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struct BiquadFilter {
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s16_le b0;
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s16_le b1;
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s16_le b2;
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s16_le a1;
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s16_le a2;
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s16_le a1;
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s16_le b2;
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s16_le b1;
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s16_le b0;
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};
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union {
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115
src/audio_core/hle/filter.cpp
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115
src/audio_core/hle/filter.cpp
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@ -0,0 +1,115 @@
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// 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 <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/dsp.h"
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#include "audio_core/hle/filter.h"
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#include "common/common_types.h"
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#include "common/math_util.h"
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namespace DSP {
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namespace 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(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 (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] = MathUtil::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(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 (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] = MathUtil::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 HLE
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} // namespace DSP
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112
src/audio_core/hle/filter.h
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112
src/audio_core/hle/filter.h
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@ -0,0 +1,112 @@
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// 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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#pragma once
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#include <array>
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#include "audio_core/hle/common.h"
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#include "audio_core/hle/dsp.h"
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#include "common/common_types.h"
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namespace DSP {
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namespace HLE {
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/// Preprocessing filters. There is an independent set of filters for each Source.
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class SourceFilters final {
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SourceFilters() { Reset(); }
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/// Reset internal state.
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void Reset();
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/**
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* Enable/Disable filters
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* See also: SourceConfiguration::Configuration::simple_filter_enabled,
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* SourceConfiguration::Configuration::biquad_filter_enabled.
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* @param simple If true, enables the simple filter. If false, disables it.
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* @param simple If true, enables the biquad filter. If false, disables it.
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*/
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void Enable(bool simple, bool biquad);
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/**
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* Configure simple filter.
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* @param config Configuration from DSP shared memory.
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*/
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void Configure(SourceConfiguration::Configuration::SimpleFilter config);
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/**
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* Configure biquad filter.
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* @param config Configuration from DSP shared memory.
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*/
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void Configure(SourceConfiguration::Configuration::BiquadFilter config);
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/**
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* Processes a frame in-place.
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* @param frame Audio samples to process. Modified in-place.
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*/
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void ProcessFrame(StereoFrame16& frame);
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private:
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bool simple_filter_enabled;
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bool biquad_filter_enabled;
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struct SimpleFilter {
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SimpleFilter() { Reset(); }
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/// Resets internal state.
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void Reset();
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/**
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* Configures this filter with application settings.
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* @param config Configuration from DSP shared memory.
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*/
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void Configure(SourceConfiguration::Configuration::SimpleFilter config);
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/**
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* Processes a single stereo PCM16 sample.
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* @param x0 Input sample
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* @return Output sample
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*/
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std::array<s16, 2> ProcessSample(const std::array<s16, 2>& x0);
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private:
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// Configuration
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s32 a1, b0;
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// Internal state
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std::array<s16, 2> y1;
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} simple_filter;
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struct BiquadFilter {
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BiquadFilter() { Reset(); }
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/// Resets internal state.
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void Reset();
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/**
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* Configures this filter with application settings.
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* @param config Configuration from DSP shared memory.
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*/
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void Configure(SourceConfiguration::Configuration::BiquadFilter config);
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/**
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* Processes a single stereo PCM16 sample.
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* @param x0 Input sample
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* @return Output sample
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*/
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std::array<s16, 2> ProcessSample(const std::array<s16, 2>& x0);
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private:
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// Configuration
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s32 a1, a2, b0, b1, b2;
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// Internal state
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std::array<s16, 2> x1;
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std::array<s16, 2> x2;
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std::array<s16, 2> y1;
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std::array<s16, 2> y2;
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} biquad_filter;
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};
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} // namespace HLE
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} // namespace DSP
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