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// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
// SPDX-FileCopyrightText: Copyright 2025 citron Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <cmath>
#include "audio_core/renderer/effect/compressor.h"
namespace AudioCore::Renderer {
void CompressorInfo::Update(BehaviorInfo::ErrorInfo& error_info,
const InParameterVersion1& in_params, const PoolMapper& pool_mapper) {}
void CompressorInfo::Update(BehaviorInfo::ErrorInfo& error_info,
const InParameterVersion2& in_params, const PoolMapper& pool_mapper) {
auto in_specific{reinterpret_cast<const ParameterVersion1*>(in_params.specific.data())};
auto params{reinterpret_cast<ParameterVersion1*>(parameter.data())};
std::memcpy(params, in_specific, sizeof(ParameterVersion1));
mix_id = in_params.mix_id;
process_order = in_params.process_order;
enabled = in_params.enabled;
error_info.error_code = ResultSuccess;
error_info.address = CpuAddr(0);
}
void CompressorInfo::UpdateForCommandGeneration() {
if (enabled) {
usage_state = UsageState::Enabled;
} else {
usage_state = UsageState::Disabled;
}
auto params{reinterpret_cast<ParameterVersion1*>(parameter.data())};
params->state = ParameterState::Updated;
}
CpuAddr CompressorInfo::GetWorkbuffer(s32 index) {
return GetSingleBuffer(index);
}
CompressorEffect::CompressorEffect(std::size_t sample_count_) : sample_count{sample_count_} {}
void CompressorEffect::Process(std::span<f32> output_buffer, std::span<const f32> input_buffer) {
if (!IsEnabled() || !parameter.IsChannelCountValid()) {
std::copy(input_buffer.begin(), input_buffer.end(), output_buffer.begin());
return;
}
if (!result_state.empty() && parameter.statistics_reset) {
statistics.Reset(static_cast<u16>(parameter.channel_count));
}
// Process audio with compressor effect
for (u32 sample_index = 0; sample_index < sample_count; sample_index++) {
float mean = 0.0f;
for (u32 channel = 0; channel < parameter.channel_count; channel++) {
const auto sample = input_buffer[sample_index * parameter.channel_count + channel];
mean += sample * sample;
}
mean /= static_cast<float>(parameter.channel_count);
// Calculate compression gain
float compression_gain = 1.0f;
if (mean > parameter.threshold) {
compression_gain = parameter.threshold / mean;
compression_gain = std::pow(compression_gain, 1.0f - (1.0f / parameter.ratio));
}
// Apply compression
for (u32 channel = 0; channel < parameter.channel_count; channel++) {
const auto in_sample = input_buffer[sample_index * parameter.channel_count + channel];
const auto out_sample = in_sample * compression_gain * parameter.input_gain;
output_buffer[sample_index * parameter.channel_count + channel] = out_sample;
// Update statistics if enabled
if (parameter.statistics_enabled) {
statistics.maximum_mean = std::max(statistics.maximum_mean, mean);
statistics.minimum_gain = std::min(statistics.minimum_gain, compression_gain);
statistics.last_samples[channel] = std::abs(in_sample) * (1.0f / 32768.0f);
}
}
}
}
} // namespace AudioCore::Renderer
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