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Mixer: Use Doubles for Sample Rate Conversion.

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Sam Belliveau 2025-04-04 00:49:03 -04:00 • committed by Jordan Woyak
parent 2d1671a863
commit 74e752ed9c
1 changed files with 9 additions and 6 deletions
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15
Source/Core/AudioCommon/Mixer.cpp
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@ -65,14 +65,17 @@ void Mixer::MixerFifo::Mix(s16* samples, std::size_t num_samples)
constexpr DT_s FADE_IN_RC = DT_s(0.008); constexpr DT_s FADE_IN_RC = DT_s(0.008);
constexpr DT_s FADE_OUT_RC = DT_s(0.064); constexpr DT_s FADE_OUT_RC = DT_s(0.064);
const u64 out_sample_rate = m_mixer->m_output_sample_rate; // We need at least a double because the index jump has 24 bits of fractional precision.
u64 in_sample_rate = FIXED_SAMPLE_RATE_DIVIDEND / m_input_sample_rate_divisor; const double out_sample_rate = m_mixer->m_output_sample_rate;
double in_sample_rate =
static_cast<double>(FIXED_SAMPLE_RATE_DIVIDEND) / m_input_sample_rate_divisor;
const float emulation_speed = m_mixer->m_config_emulation_speed; const double emulation_speed = m_mixer->m_config_emulation_speed;
if (0 < emulation_speed && emulation_speed != 1.0) if (0 < emulation_speed && emulation_speed != 1.0)
in_sample_rate = static_cast<u64>(std::llround(in_sample_rate * emulation_speed)); in_sample_rate *= emulation_speed;
const u32 index_jump = (in_sample_rate << GRANULE_FRAC_BITS) / (out_sample_rate); const double base = static_cast<double>(1 << GRANULE_FRAC_BITS);
const u32 index_jump = std::lround(base * in_sample_rate / out_sample_rate);
// These fade in / out multiplier are tuned to match a constant // These fade in / out multiplier are tuned to match a constant
// fade speed regardless of the input or the output sample rate. // fade speed regardless of the input or the output sample rate.
@ -83,7 +86,7 @@ void Mixer::MixerFifo::Mix(s16* samples, std::size_t num_samples)
// Calculate the ideal length of the granule queue. // Calculate the ideal length of the granule queue.
const std::size_t buffer_size_ms = m_mixer->m_config_audio_buffer_ms; const std::size_t buffer_size_ms = m_mixer->m_config_audio_buffer_ms;
const std::size_t buffer_size_samples = buffer_size_ms * in_sample_rate / 1000; const std::size_t buffer_size_samples = std::llround(buffer_size_ms * in_sample_rate / 1000.0);
// Limit the possible queue sizes to any number between 4 and 64. // Limit the possible queue sizes to any number between 4 and 64.
const std::size_t buffer_size_granules = const std::size_t buffer_size_granules =