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audio_core: Fix off-by-one error in upsampler

master
Merry 2023-01-14 15:19:11 +07:00
parent 0e8f98a441
commit 122a8faa38
1 changed files with 13 additions and 34 deletions
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47
src/audio_core/renderer/command/resample/upsample.cpp
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@ -94,49 +94,28 @@ static void SrcProcessFrame(std::span<s32> output, std::span<const s32> input,
auto calculate_sample = [&state](std::span<const Common::FixedPoint<24, 8>> coeffs1,
std::span<const Common::FixedPoint<24, 8>> coeffs2) -> s32 {
auto output_index{state->history_output_index};
auto start_pos{output_index - state->history_start_index + 1U};
auto end_pos{10U};
u64 result{0};
if (start_pos < 10) {
end_pos = start_pos;
}
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();
u64 prev_contrib{0};
u32 coeff_index{0};
for (; coeff_index < end_pos; coeff_index++, output_index--) {
prev_contrib += static_cast<u64>(state->history[output_index].to_raw()) *
coeffs1[coeff_index].to_raw();
}
auto end_index{state->history_end_index};
for (; start_pos < 9; start_pos++, coeff_index++, end_index--) {
prev_contrib += static_cast<u64>(state->history[end_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);
start_pos = state->history_end_index - output_index + 1U;
end_pos = 10U;
if (start_pos < 10) {
end_pos = start_pos;
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;
}
u64 next_contrib{0};
coeff_index = 0;
for (; coeff_index < end_pos; coeff_index++, output_index++) {
next_contrib += static_cast<u64>(state->history[output_index].to_raw()) *
coeffs2[coeff_index].to_raw();
}
auto start_index{state->history_start_index};
for (; start_pos < 9; start_pos++, start_index++, coeff_index++) {
next_contrib += static_cast<u64>(state->history[start_index].to_raw()) *
coeffs2[coeff_index].to_raw();
}
return static_cast<s32>(((prev_contrib >> 15) + (next_contrib >> 15)) >> 8);
return static_cast<s32>(result >> (8 + 15));
};
switch (state->ratio.to_int_floor()) {