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// SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <array>
#include "audio_core/renderer/adsp/command_list_processor.h"
#include "audio_core/renderer/command/resample/upsample.h"
#include "audio_core/renderer/upsampler/upsampler_info.h"
namespace AudioCore::AudioRenderer {
/**
* Upsampling impl. Input must be 8K, 16K or 32K, output is 48K.
*
* @param output - Output buffer.
* @param input - Input buffer.
* @param target_sample_count - Number of samples for output.
* @param state - Upsampler state, updated each call.
*/
static void SrcProcessFrame(std::span<s32> output, std::span<const s32> input,
const u32 target_sample_count, const u32 source_sample_count,
UpsamplerState* state) {
constexpr u32 WindowSize = 10;
constexpr std::array<Common::FixedPoint<17, 15>, WindowSize> WindowedSinc1{
0.95376587f, -0.12872314f, 0.060028076f, -0.032470703f, 0.017669678f,
-0.009124756f, 0.004272461f, -0.001739502f, 0.000579834f, -0.000091552734f,
};
constexpr std::array<Common::FixedPoint<17, 15>, WindowSize> WindowedSinc2{
0.8230896f, -0.19161987f, 0.093444824f, -0.05090332f, 0.027557373f,
-0.014038086f, 0.0064697266f, -0.002532959f, 0.00079345703f, -0.00012207031f,
};
constexpr std::array<Common::FixedPoint<17, 15>, WindowSize> WindowedSinc3{
0.6298828f, -0.19274902f, 0.09725952f, -0.05319214f, 0.028625488f,
-0.014373779f, 0.006500244f, -0.0024719238f, 0.0007324219f, -0.000091552734f,
};
constexpr std::array<Common::FixedPoint<17, 15>, WindowSize> WindowedSinc4{
0.4057312f, -0.1468811f, 0.07601929f, -0.041656494f, 0.022216797f,
-0.011016846f, 0.004852295f, -0.0017700195f, 0.00048828125f, -0.000030517578f,
};
constexpr std::array<Common::FixedPoint<17, 15>, WindowSize> WindowedSinc5{
0.1854248f, -0.075164795f, 0.03967285f, -0.021728516f, 0.011474609f,
-0.005584717f, 0.0024108887f, -0.0008239746f, 0.00021362305f, 0.0f,
};
if (!state->initialized) {
switch (source_sample_count) {
case 40:
state->window_size = WindowSize;
state->ratio = 6.0f;
state->history.fill(0);
break;
case 80:
state->window_size = WindowSize;
state->ratio = 3.0f;
state->history.fill(0);
break;
case 160:
state->window_size = WindowSize;
state->ratio = 1.5f;
state->history.fill(0);
break;
default:
LOG_ERROR(Service_Audio, "Invalid upsampling source count {}!", source_sample_count);
// This continues anyway, but let's assume 160 for sanity
state->window_size = WindowSize;
state->ratio = 1.5f;
state->history.fill(0);
break;
}
state->history_input_index = 0;
state->history_output_index = 9;
state->history_start_index = 0;
state->history_end_index = UpsamplerState::HistorySize - 1;
state->initialized = true;
}
if (target_sample_count == 0) {
return;
}
u32 read_index{0};
auto increment = [&]() -> void {
state->history[state->history_input_index] = input[read_index++];
state->history_input_index =
static_cast<u16>((state->history_input_index + 1) % UpsamplerState::HistorySize);
state->history_output_index =
static_cast<u16>((state->history_output_index + 1) % UpsamplerState::HistorySize);
};
auto calculate_sample = [&state](std::span<const Common::FixedPoint<17, 15>> coeffs1,
std::span<const Common::FixedPoint<17, 15>> coeffs2) -> s32 {
auto output_index{state->history_output_index};
u64 result{0};
for (u32 coeff_index = 0; coeff_index < 10; coeff_index++) {
result += static_cast<u64>(state->history[output_index].to_raw()) *
coeffs1[coeff_index].to_raw();
output_index = output_index == state->history_start_index ? state->history_end_index
: output_index - 1;
}
output_index =
static_cast<u16>((state->history_output_index + 1) % UpsamplerState::HistorySize);
for (u32 coeff_index = 0; coeff_index < 10; coeff_index++) {
result += static_cast<u64>(state->history[output_index].to_raw()) *
coeffs2[coeff_index].to_raw();
output_index = output_index == state->history_end_index ? state->history_start_index
: output_index + 1;
}
return static_cast<s32>(result >> (8 + 15));
};
switch (state->ratio.to_int_floor()) {
// 40 -> 240
case 6:
for (u32 write_index = 0; write_index < target_sample_count; write_index++) {
switch (state->sample_index) {
case 0:
increment();
output[write_index] = state->history[state->history_output_index].to_int_floor();
break;
case 1:
output[write_index] = calculate_sample(WindowedSinc1, WindowedSinc5);
break;
case 2:
output[write_index] = calculate_sample(WindowedSinc2, WindowedSinc4);
break;
case 3:
output[write_index] = calculate_sample(WindowedSinc3, WindowedSinc3);
break;
case 4:
output[write_index] = calculate_sample(WindowedSinc4, WindowedSinc2);
break;
case 5:
output[write_index] = calculate_sample(WindowedSinc5, WindowedSinc1);
break;
}
state->sample_index = static_cast<u8>((state->sample_index + 1) % 6);
}
break;
// 80 -> 240
case 3:
for (u32 write_index = 0; write_index < target_sample_count; write_index++) {
switch (state->sample_index) {
case 0:
increment();
output[write_index] = state->history[state->history_output_index].to_int_floor();
break;
case 1:
output[write_index] = calculate_sample(WindowedSinc2, WindowedSinc4);
break;
case 2:
output[write_index] = calculate_sample(WindowedSinc4, WindowedSinc2);
break;
}
state->sample_index = static_cast<u8>((state->sample_index + 1) % 3);
}
break;
// 160 -> 240
default:
for (u32 write_index = 0; write_index < target_sample_count; write_index++) {
switch (state->sample_index) {
case 0:
increment();
output[write_index] = state->history[state->history_output_index].to_int_floor();
break;
case 1:
output[write_index] = calculate_sample(WindowedSinc4, WindowedSinc2);
break;
case 2:
increment();
output[write_index] = calculate_sample(WindowedSinc2, WindowedSinc4);
break;
}
state->sample_index = static_cast<u8>((state->sample_index + 1) % 3);
}
break;
}
}
auto UpsampleCommand::Dump([[maybe_unused]] const ADSP::CommandListProcessor& processor,
std::string& string) -> void {
string += fmt::format("UpsampleCommand\n\tsource_sample_count {} source_sample_rate {}",
source_sample_count, source_sample_rate);
const auto upsampler{reinterpret_cast<UpsamplerInfo*>(upsampler_info)};
if (upsampler != nullptr) {
string += fmt::format("\n\tUpsampler\n\t\tenabled {} sample count {}\n\tinputs: ",
upsampler->enabled, upsampler->sample_count);
for (u32 i = 0; i < upsampler->input_count; i++) {
string += fmt::format("{:02X}, ", upsampler->inputs[i]);
}
}
string += "\n";
}
void UpsampleCommand::Process(const ADSP::CommandListProcessor& processor) {
const auto info{reinterpret_cast<UpsamplerInfo*>(upsampler_info)};
const auto input_count{std::min(info->input_count, buffer_count)};
const std::span<const s16> inputs_{reinterpret_cast<const s16*>(inputs), input_count};
for (u32 i = 0; i < input_count; i++) {
const auto channel{inputs_[i]};
if (channel >= 0 && channel < static_cast<s16>(processor.buffer_count)) {
auto state{&info->states[i]};
std::span<s32> output{
reinterpret_cast<s32*>(samples_buffer + info->sample_count * channel * sizeof(s32)),
info->sample_count};
auto input{processor.mix_buffers.subspan(channel * processor.sample_count,
processor.sample_count)};
SrcProcessFrame(output, input, info->sample_count, source_sample_count, state);
}
}
}
bool UpsampleCommand::Verify(const ADSP::CommandListProcessor& processor) {
return true;
}
} // namespace AudioCore::AudioRenderer
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