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// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <cmath>
#include <span>
#include <vector>
#include "audio_core/adsp/apps/audio_renderer/command_list_processor.h"
#include "audio_core/renderer/command/effect/compressor.h"
#include "audio_core/renderer/effect/compressor.h"
namespace AudioCore::Renderer {
static void SetCompressorEffectParameter(const CompressorInfo::ParameterVersion2& params,
CompressorInfo::State& state) {
const auto ratio{1.0f / params.compressor_ratio};
auto makeup_gain{0.0f};
if (params.makeup_gain_enabled) {
makeup_gain = (params.threshold * 0.5f) * (ratio - 1.0f) - 3.0f;
}
state.makeup_gain = makeup_gain;
state.unk_18 = params.unk_28;
const auto a{(params.out_gain + makeup_gain) / 20.0f * 3.3219f};
const auto b{(a - std::trunc(a)) * 0.69315f};
const auto c{std::pow(2.0f, b)};
state.unk_0C = (1.0f - ratio) / 6.0f;
state.unk_14 = params.threshold + 1.5f;
state.unk_10 = params.threshold - 1.5f;
state.unk_20 = c;
}
static void InitializeCompressorEffect(const CompressorInfo::ParameterVersion2& params,
CompressorInfo::State& state) {
state = {};
state.unk_00 = 0;
state.unk_04 = 1.0f;
state.unk_08 = 1.0f;
SetCompressorEffectParameter(params, state);
}
static void ApplyCompressorEffect(const CompressorInfo::ParameterVersion2& params,
CompressorInfo::State& state, bool enabled,
std::span<std::span<const s32>> input_buffers,
std::span<std::span<s32>> output_buffers, u32 sample_count) {
if (enabled) {
auto state_00{state.unk_00};
auto state_04{state.unk_04};
auto state_08{state.unk_08};
auto state_18{state.unk_18};
for (u32 i = 0; i < sample_count; i++) {
auto a{0.0f};
for (s16 channel = 0; channel < params.channel_count; channel++) {
const auto input_sample{Common::FixedPoint<49, 15>(input_buffers[channel][i])};
a += (input_sample * input_sample).to_float();
}
state_00 += params.unk_24 * ((a / params.channel_count) - state.unk_00);
auto b{-100.0f};
auto c{0.0f};
if (state_00 >= 1.0e-10) {
b = std::log10(state_00) * 10.0f;
c = 1.0f;
}
if (b >= state.unk_10) {
const auto d{b >= state.unk_14
? ((1.0f / params.compressor_ratio) - 1.0f) *
(b - params.threshold)
: (b - state.unk_10) * (b - state.unk_10) * -state.unk_0C};
const auto e{d / 20.0f * 3.3219f};
const auto f{(e - std::trunc(e)) * 0.69315f};
c = std::pow(2.0f, f);
}
state_18 = params.unk_28;
auto tmp{c};
if ((state_04 - c) <= 0.08f) {
state_18 = params.unk_2C;
if (((state_04 - c) >= -0.08f) && (std::abs(state_08 - c) >= 0.001f)) {
tmp = state_04;
}
}
state_04 = tmp;
state_08 += (c - state_08) * state_18;
for (s16 channel = 0; channel < params.channel_count; channel++) {
output_buffers[channel][i] = static_cast<s32>(
static_cast<f32>(input_buffers[channel][i]) * state_08 * state.unk_20);
}
}
state.unk_00 = state_00;
state.unk_04 = state_04;
state.unk_08 = state_08;
state.unk_18 = state_18;
} else {
for (s16 channel = 0; channel < params.channel_count; channel++) {
if (params.inputs[channel] != params.outputs[channel]) {
std::memcpy(output_buffers[channel].data(), input_buffers[channel].data(),
output_buffers[channel].size_bytes());
}
}
}
}
void CompressorCommand::Dump([[maybe_unused]] const AudioRenderer::CommandListProcessor& processor,
std::string& string) {
string += fmt::format("CompressorCommand\n\tenabled {} \n\tinputs: ", effect_enabled);
for (s16 i = 0; i < parameter.channel_count; i++) {
string += fmt::format("{:02X}, ", inputs[i]);
}
string += "\n\toutputs: ";
for (s16 i = 0; i < parameter.channel_count; i++) {
string += fmt::format("{:02X}, ", outputs[i]);
}
string += "\n";
}
void CompressorCommand::Process(const AudioRenderer::CommandListProcessor& processor) {
std::array<std::span<const s32>, MaxChannels> input_buffers{};
std::array<std::span<s32>, MaxChannels> output_buffers{};
for (s16 i = 0; i < parameter.channel_count; i++) {
input_buffers[i] = processor.mix_buffers.subspan(inputs[i] * processor.sample_count,
processor.sample_count);
output_buffers[i] = processor.mix_buffers.subspan(outputs[i] * processor.sample_count,
processor.sample_count);
}
auto state_{reinterpret_cast<CompressorInfo::State*>(state)};
if (effect_enabled) {
if (parameter.state == CompressorInfo::ParameterState::Updating) {
SetCompressorEffectParameter(parameter, *state_);
} else if (parameter.state == CompressorInfo::ParameterState::Initialized) {
InitializeCompressorEffect(parameter, *state_);
}
}
ApplyCompressorEffect(parameter, *state_, effect_enabled, input_buffers, output_buffers,
processor.sample_count);
}
bool CompressorCommand::Verify(const AudioRenderer::CommandListProcessor& processor) {
return true;
}
} // namespace AudioCore::Renderer
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