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// Copyright 2016 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <cstddef>
#include "audio_core/hle/common.h"
#include "audio_core/hle/dsp.h"
#include "audio_core/hle/mixers.h"
#include "common/assert.h"
#include "common/logging/log.h"
#include "common/math_util.h"
namespace DSP {
namespace HLE {
void Mixers::Reset() {
current_frame.fill({});
state = {};
}
DspStatus Mixers::Tick(DspConfiguration& config, const IntermediateMixSamples& read_samples,
IntermediateMixSamples& write_samples,
const std::array<QuadFrame32, 3>& input) {
ParseConfig(config);
AuxReturn(read_samples);
AuxSend(write_samples, input);
MixCurrentFrame();
return GetCurrentStatus();
}
void Mixers::ParseConfig(DspConfiguration& config) {
if (!config.dirty_raw) {
return;
}
if (config.mixer1_enabled_dirty) {
config.mixer1_enabled_dirty.Assign(0);
state.mixer1_enabled = config.mixer1_enabled != 0;
LOG_TRACE(Audio_DSP, "mixers mixer1_enabled = %hu", config.mixer1_enabled);
}
if (config.mixer2_enabled_dirty) {
config.mixer2_enabled_dirty.Assign(0);
state.mixer2_enabled = config.mixer2_enabled != 0;
LOG_TRACE(Audio_DSP, "mixers mixer2_enabled = %hu", config.mixer2_enabled);
}
if (config.volume_0_dirty) {
config.volume_0_dirty.Assign(0);
state.intermediate_mixer_volume[0] = config.volume[0];
LOG_TRACE(Audio_DSP, "mixers volume[0] = %f", config.volume[0]);
}
if (config.volume_1_dirty) {
config.volume_1_dirty.Assign(0);
state.intermediate_mixer_volume[1] = config.volume[1];
LOG_TRACE(Audio_DSP, "mixers volume[1] = %f", config.volume[1]);
}
if (config.volume_2_dirty) {
config.volume_2_dirty.Assign(0);
state.intermediate_mixer_volume[2] = config.volume[2];
LOG_TRACE(Audio_DSP, "mixers volume[2] = %f", config.volume[2]);
}
if (config.output_format_dirty) {
config.output_format_dirty.Assign(0);
state.output_format = config.output_format;
LOG_TRACE(Audio_DSP, "mixers output_format = %zu",
static_cast<size_t>(config.output_format));
}
if (config.headphones_connected_dirty) {
config.headphones_connected_dirty.Assign(0);
// Do nothing. (Note: Whether headphones are connected does affect coefficients used for
// surround sound.)
LOG_TRACE(Audio_DSP, "mixers headphones_connected=%hu", config.headphones_connected);
}
if (config.dirty_raw) {
LOG_DEBUG(Audio_DSP, "mixers remaining_dirty=%x", config.dirty_raw);
}
config.dirty_raw = 0;
}
static s16 ClampToS16(s32 value) {
return static_cast<s16>(MathUtil::Clamp(value, -32768, 32767));
}
static std::array<s16, 2> AddAndClampToS16(const std::array<s16, 2>& a,
const std::array<s16, 2>& b) {
return {ClampToS16(static_cast<s32>(a[0]) + static_cast<s32>(b[0])),
ClampToS16(static_cast<s32>(a[1]) + static_cast<s32>(b[1]))};
}
void Mixers::DownmixAndMixIntoCurrentFrame(float gain, const QuadFrame32& samples) {
// TODO(merry): Limiter. (Currently we're performing final mixing assuming a disabled limiter.)
switch (state.output_format) {
case OutputFormat::Mono:
std::transform(
current_frame.begin(), current_frame.end(), samples.begin(), current_frame.begin(),
[gain](const std::array<s16, 2>& accumulator,
const std::array<s32, 4>& sample) -> std::array<s16, 2> {
// Downmix to mono
s16 mono = ClampToS16(static_cast<s32>(
(gain * sample[0] + gain * sample[1] + gain * sample[2] + gain * sample[3]) /
2));
// Mix into current frame
return AddAndClampToS16(accumulator, {mono, mono});
});
return;
case OutputFormat::Surround:
// TODO(merry): Implement surround sound.
// fallthrough
case OutputFormat::Stereo:
std::transform(
current_frame.begin(), current_frame.end(), samples.begin(), current_frame.begin(),
[gain](const std::array<s16, 2>& accumulator,
const std::array<s32, 4>& sample) -> std::array<s16, 2> {
// Downmix to stereo
s16 left = ClampToS16(static_cast<s32>(gain * sample[0] + gain * sample[2]));
s16 right = ClampToS16(static_cast<s32>(gain * sample[1] + gain * sample[3]));
// Mix into current frame
return AddAndClampToS16(accumulator, {left, right});
});
return;
}
UNREACHABLE_MSG("Invalid output_format %zu", static_cast<size_t>(state.output_format));
}
void Mixers::AuxReturn(const IntermediateMixSamples& read_samples) {
// NOTE: read_samples.mix{1,2}.pcm32 annoyingly have their dimensions in reverse order to
// QuadFrame32.
if (state.mixer1_enabled) {
for (size_t sample = 0; sample < samples_per_frame; sample++) {
for (size_t channel = 0; channel < 4; channel++) {
state.intermediate_mix_buffer[1][sample][channel] =
read_samples.mix1.pcm32[channel][sample];
}
}
}
if (state.mixer2_enabled) {
for (size_t sample = 0; sample < samples_per_frame; sample++) {
for (size_t channel = 0; channel < 4; channel++) {
state.intermediate_mix_buffer[2][sample][channel] =
read_samples.mix2.pcm32[channel][sample];
}
}
}
}
void Mixers::AuxSend(IntermediateMixSamples& write_samples,
const std::array<QuadFrame32, 3>& input) {
// NOTE: read_samples.mix{1,2}.pcm32 annoyingly have their dimensions in reverse order to
// QuadFrame32.
state.intermediate_mix_buffer[0] = input[0];
if (state.mixer1_enabled) {
for (size_t sample = 0; sample < samples_per_frame; sample++) {
for (size_t channel = 0; channel < 4; channel++) {
write_samples.mix1.pcm32[channel][sample] = input[1][sample][channel];
}
}
} else {
state.intermediate_mix_buffer[1] = input[1];
}
if (state.mixer2_enabled) {
for (size_t sample = 0; sample < samples_per_frame; sample++) {
for (size_t channel = 0; channel < 4; channel++) {
write_samples.mix2.pcm32[channel][sample] = input[2][sample][channel];
}
}
} else {
state.intermediate_mix_buffer[2] = input[2];
}
}
void Mixers::MixCurrentFrame() {
current_frame.fill({});
for (size_t mix = 0; mix < 3; mix++) {
DownmixAndMixIntoCurrentFrame(state.intermediate_mixer_volume[mix],
state.intermediate_mix_buffer[mix]);
}
// TODO(merry): Compressor. (We currently assume a disabled compressor.)
}
DspStatus Mixers::GetCurrentStatus() const {
DspStatus status;
status.unknown = 0;
status.dropped_frames = 0;
return status;
}
} // namespace HLE
} // namespace DSP
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