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Improve Performance of Granular Buffering + User Adjustable Buffer Size
This commit is contained in:
Sam Belliveau
@ -11,6 +11,7 @@
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#include "Common/ChunkFile.h"
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#include "Common/CommonTypes.h"
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#include "Common/Logging/Log.h"
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#include "Common/MathUtil.h"
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#include "Common/Swap.h"
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#include "Core/Config/MainSettings.h"
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#include "Core/Core.h"
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@ -60,7 +61,9 @@ void Mixer::DoState(PointerWrap& p)
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// Executed from sound stream thread
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void Mixer::MixerFifo::Mix(s16* samples, std::size_t num_samples)
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{
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constexpr u32 half = 0x80000000;
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constexpr u32 INDEX_HALF = 0x80000000;
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constexpr DT_s FADE_IN_RC = DT_s(0.008);
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constexpr DT_s FADE_OUT_RC = DT_s(0.064);
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const u64 out_sample_rate = m_mixer->m_output_sample_rate;
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u64 in_sample_rate = FIXED_SAMPLE_RATE_DIVIDEND / m_input_sample_rate_divisor;
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@ -69,33 +72,86 @@ void Mixer::MixerFifo::Mix(s16* samples, std::size_t num_samples)
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if (0 < emulation_speed && emulation_speed != 1.0)
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in_sample_rate = static_cast<u64>(std::llround(in_sample_rate * emulation_speed));
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const u32 index_jump = (in_sample_rate << GRANULE_BUFFER_FRAC_BITS) / (out_sample_rate);
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const u32 index_jump = (in_sample_rate << GRANULE_FRAC_BITS) / (out_sample_rate);
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// These fade in / out multiplier are tuned to match a constant
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// fade speed regardless of the input or the output sample rate.
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const float fade_in_mul = -std::expm1(-DT_s(1.0) / (out_sample_rate * FADE_IN_RC));
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const float fade_out_mul = -std::expm1(-DT_s(1.0) / (out_sample_rate * FADE_OUT_RC));
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const StereoPair volume{m_LVolume.load() / 256.0f, m_RVolume.load() / 256.0f};
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// Calculate the ideal length of the granule queue.
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const std::size_t buffer_size_ms = m_mixer->m_config_audio_buffer_ms;
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const std::size_t buffer_size_samples = buffer_size_ms * in_sample_rate / 1000;
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// Limit the possible queue sizes to any number between 4 and 64.
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const std::size_t buffer_size_granules =
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std::clamp((buffer_size_samples) / (GRANULE_SIZE >> 1), static_cast<std::size_t>(4),
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static_cast<std::size_t>(MAX_GRANULE_QUEUE_SIZE));
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m_granule_queue_size.store(buffer_size_granules, std::memory_order_relaxed);
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while (num_samples-- > 0)
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{
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StereoPair sample = Granule::InterpStereoPair(m_front, m_back, m_current_index);
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sample *= volume;
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sample.l += samples[0] + m_quantization_error.l;
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samples[0] = ToShort(std::lround(sample.l));
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m_quantization_error.l = std::clamp(sample.l - samples[0], -1.0f, 1.0f);
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sample.r += samples[1] + m_quantization_error.r;
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samples[1] = ToShort(std::lround(sample.r));
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m_quantization_error.r = std::clamp(sample.r - samples[1], -1.0f, 1.0f);
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samples += 2;
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// The indexes for the front and back buffers are offset by 50% of the granule size.
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// We use the modular nature of 32-bit integers to wrap around the granule size.
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m_current_index += index_jump;
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if (m_current_index < half)
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{
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m_front = m_back;
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const u32 front_index = m_current_index;
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const u32 back_index = m_current_index + INDEX_HALF;
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// If either index is less than the index jump, that means we reached
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// the end of the of the buffer and need to load the next granule.
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if (front_index < index_jump)
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Dequeue(&m_front);
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else if (back_index < index_jump)
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Dequeue(&m_back);
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m_current_index += half;
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}
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// The Granules are pre-windowed, so we can just add them together
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const std::size_t ft = front_index >> GRANULE_FRAC_BITS;
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const std::size_t bt = back_index >> GRANULE_FRAC_BITS;
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const StereoPair s0 = m_front[(ft - 2) & GRANULE_MASK] + m_back[(bt - 2) & GRANULE_MASK];
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const StereoPair s1 = m_front[(ft - 1) & GRANULE_MASK] + m_back[(bt - 1) & GRANULE_MASK];
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const StereoPair s2 = m_front[(ft + 0) & GRANULE_MASK] + m_back[(bt + 0) & GRANULE_MASK];
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const StereoPair s3 = m_front[(ft + 1) & GRANULE_MASK] + m_back[(bt + 1) & GRANULE_MASK];
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const StereoPair s4 = m_front[(ft + 2) & GRANULE_MASK] + m_back[(bt + 2) & GRANULE_MASK];
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const StereoPair s5 = m_front[(ft + 3) & GRANULE_MASK] + m_back[(bt + 3) & GRANULE_MASK];
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// Polynomial Interpolators for High-Quality Resampling of
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// Over Sampled Audio by Olli Niemitalo, October 2001.
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// Page 43 -- 6-point, 3rd-order Hermite:
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// https://yehar.com/blog/wp-content/uploads/2009/08/deip.pdf
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const u32 t_frac = m_current_index & ((1 << GRANULE_FRAC_BITS) - 1);
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const float t1 = t_frac / static_cast<float>(1 << GRANULE_FRAC_BITS);
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const float t2 = t1 * t1;
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const float t3 = t2 * t1;
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StereoPair sample = (s0 * StereoPair{(+0.0f + 1.0f * t1 - 2.0f * t2 + 1.0f * t3) / 12.0f} +
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s1 * StereoPair{(+0.0f - 8.0f * t1 + 15.0f * t2 - 7.0f * t3) / 12.0f} +
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s2 * StereoPair{(+3.0f + 0.0f * t1 - 7.0f * t2 + 4.0f * t3) / 3.0f} +
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s3 * StereoPair{(+0.0f + 2.0f * t1 + 5.0f * t2 - 4.0f * t3) / 3.0f} +
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s4 * StereoPair{(+0.0f - 1.0f * t1 - 6.0f * t2 + 7.0f * t3) / 12.0f} +
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s5 * StereoPair{(+0.0f + 0.0f * t1 + 1.0f * t2 - 1.0f * t3) / 12.0f});
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// Apply Fade In / Fade Out depending on if we are looping
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if (m_queue_looping.load(std::memory_order_relaxed))
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m_fade_volume += fade_out_mul * (0.0f - m_fade_volume);
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else
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m_fade_volume += fade_in_mul * (1.0f - m_fade_volume);
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// Apply the fade volume and the regular volume to the sample
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sample = sample * volume * StereoPair{m_fade_volume};
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// This quantization method prevents accumulated error but does not do noise shaping.
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sample.l += samples[0] - m_quantization_error.l;
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samples[0] = MathUtil::SaturatingCast<s16>(std::lround(sample.l));
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m_quantization_error.l = std::clamp(samples[0] - sample.l, -1.0f, 1.0f);
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sample.r += samples[1] - m_quantization_error.r;
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samples[1] = MathUtil::SaturatingCast<s16>(std::lround(sample.r));
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m_quantization_error.r = std::clamp(samples[1] - sample.r, -1.0f, 1.0f);
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samples += 2;
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}
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}
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@ -152,13 +208,15 @@ void Mixer::MixerFifo::PushSamples(const s16* samples, std::size_t num_samples)
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{
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const s16 l = m_little_endian ? samples[1] : Common::swap16(samples[1]);
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const s16 r = m_little_endian ? samples[0] : Common::swap16(samples[0]);
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m_buffer[m_buffer_index] = StereoPair(l, r);
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m_buffer_index = (m_buffer_index + 1) & GRANULE_BUFFER_MASK;
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samples += 2;
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if (m_buffer_index == 0 || m_buffer_index == m_buffer.size() / 2)
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Enqueue(Granule(m_buffer, m_buffer_index));
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m_next_buffer[m_next_buffer_index] = StereoPair(l, r);
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m_next_buffer_index = (m_next_buffer_index + 1) & GRANULE_MASK;
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// The granules overlap by 50%, so we need to enqueue the
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// next buffer every time we fill half of the samples.
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if (m_next_buffer_index == 0 || m_next_buffer_index == m_next_buffer.size() / 2)
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Enqueue();
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}
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}
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@ -347,7 +405,8 @@ void Mixer::StopLogDSPAudio()
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void Mixer::RefreshConfig()
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{
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m_config_emulation_speed = Config::Get(Config::MAIN_EMULATION_SPEED);
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m_audio_fill_gaps = Config::Get(Config::MAIN_AUDIO_FILL_GAPS);
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m_config_fill_audio_gaps = Config::Get(Config::MAIN_AUDIO_FILL_GAPS);
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m_config_audio_buffer_ms = Config::Get(Config::MAIN_AUDIO_BUFFER_SIZE);
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}
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void Mixer::MixerFifo::DoState(PointerWrap& p)
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@ -378,78 +437,16 @@ std::pair<s32, s32> Mixer::MixerFifo::GetVolume() const
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return std::make_pair(m_LVolume.load(), m_RVolume.load());
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}
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void Mixer::MixerFifo::Enqueue(const Granule& granule)
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{
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const std::size_t head = m_queue_head.load(std::memory_order_relaxed);
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std::size_t next_head = (head + 1) % GRANULE_QUEUE_SIZE;
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if (next_head == m_queue_tail.load(std::memory_order_acquire))
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next_head = (head + GRANULE_QUEUE_SIZE / 2) % GRANULE_QUEUE_SIZE;
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m_queue[head] = granule;
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m_queue_head.store(next_head, std::memory_order_release);
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m_queue_looping.store(false, std::memory_order_relaxed);
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}
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void Mixer::MixerFifo::Dequeue(Granule* granule)
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{
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// import numpy as np
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// import scipy.signal as signal
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// window = np.cumsum(signal.windows.dpss(32, 10))[::-1]
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// window /= window.max()
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// elements = ", ".join([f"{x:.10f}f" for x in window])
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// print(f'constexpr std::array<StereoPair, {len(window)}> FADE_WINDOW = {{ {elements} }};')
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constexpr std::array<float, 32> FADE_WINDOW = {
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1.0000000000f, 0.9999999932f, 0.9999998472f, 0.9999982765f, 0.9999870876f, 0.9999278274f,
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0.9996794215f, 0.9988227502f, 0.9963278433f, 0.9900772448f, 0.9764215513f, 0.9501402658f,
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0.9052392639f, 0.8367449916f, 0.7430540364f, 0.6277889467f, 0.5000000000f, 0.3722110533f,
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0.2569459636f, 0.1632550084f, 0.0947607361f, 0.0498597342f, 0.0235784487f, 0.0099227552f,
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0.0036721567f, 0.0011772498f, 0.0003205785f, 0.0000721726f, 0.0000129124f, 0.0000017235f,
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0.0000001528f, 0.0000000068f};
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const std::size_t tail = m_queue_tail.load(std::memory_order_relaxed);
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std::size_t next_tail = (tail + 1) % GRANULE_QUEUE_SIZE;
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if (next_tail == m_queue_head.load(std::memory_order_acquire))
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{
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// Only fill gaps when running to prevent stutter on pause.
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const bool is_running = Core::GetState(Core::System::GetInstance()) == Core::State::Running;
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if (m_mixer->m_audio_fill_gaps && is_running)
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{
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next_tail = (tail + GRANULE_QUEUE_SIZE / 2) % GRANULE_QUEUE_SIZE;
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m_queue_looping.store(true, std::memory_order_relaxed);
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}
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else
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{
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*granule = Granule();
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return;
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}
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}
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if (m_queue_looping.load(std::memory_order_relaxed))
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m_queue_fade_index = std::min(m_queue_fade_index + 1, FADE_WINDOW.size() - 1);
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else
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m_queue_fade_index = 0;
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*granule = m_queue[tail];
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*granule *= StereoPair(FADE_WINDOW[m_queue_fade_index]);
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m_queue_tail.store(next_tail, std::memory_order_release);
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}
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// Implementation of Granule's constructor
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constexpr Mixer::MixerFifo::Granule::Granule(const GranuleBuffer& input,
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const std::size_t start_index)
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void Mixer::MixerFifo::Enqueue()
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{
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// import numpy as np
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// import scipy.signal as signal
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// window = np.convolve(np.ones(128), signal.windows.dpss(128 + 1, 4))
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// window /= (window[:len(window) // 2] + window[len(window) // 2:]).max()
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// elements = ", ".join([f"{x:.10f}f" for x in window])
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// print(f'constexpr std::array<StereoPair, GRANULE_BUFFER_SIZE> GRANULE_WINDOW = {{ {elements}
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// print(f'constexpr std::array<StereoPair, GRANULE_SIZE> GRANULE_WINDOW = {{ {elements}
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// }};')
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constexpr std::array<float, GRANULE_BUFFER_SIZE> GRANULE_WINDOW = {
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constexpr std::array<StereoPair, GRANULE_SIZE> GRANULE_WINDOW = {
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0.0000016272f, 0.0000050749f, 0.0000113187f, 0.0000216492f, 0.0000377350f, 0.0000616906f,
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0.0000961509f, 0.0001443499f, 0.0002102045f, 0.0002984010f, 0.0004144844f, 0.0005649486f,
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0.0007573262f, 0.0010002765f, 0.0013036694f, 0.0016786636f, 0.0021377783f, 0.0026949534f,
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@ -494,45 +491,64 @@ constexpr Mixer::MixerFifo::Granule::Granule(const GranuleBuffer& input,
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0.0002984010f, 0.0002102045f, 0.0001443499f, 0.0000961509f, 0.0000616906f, 0.0000377350f,
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0.0000216492f, 0.0000113187f, 0.0000050749f, 0.0000016272f};
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const auto input_middle = input.end() - start_index;
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std::ranges::rotate_copy(input, input_middle, m_buffer.begin());
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const std::size_t head = m_queue_head.load(std::memory_order_acquire);
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for (std::size_t i = 0; i < m_buffer.size(); ++i)
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m_buffer[i] *= StereoPair(GRANULE_WINDOW[i]);
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// Check if we run out of space in the circular queue. (rare)
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std::size_t next_head = (head + 1) & GRANULE_QUEUE_MASK;
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if (next_head == m_queue_tail.load(std::memory_order_acquire))
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{
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WARN_LOG_FMT(AUDIO,
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"Granule Queue has completely filled and audio samples are being dropped. "
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"This should not happen unless the audio backend has stopped requesting audio.");
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return;
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}
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// By preconstructing the granule window, we have the best chance of
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// the compiler optimizing this loop using SIMD instructions.
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const std::size_t start_index = m_next_buffer_index;
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for (std::size_t i = 0; i < GRANULE_SIZE; ++i)
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m_queue[head][i] = m_next_buffer[(i + start_index) & GRANULE_MASK] * GRANULE_WINDOW[i];
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m_queue_head.store(next_head, std::memory_order_release);
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m_queue_looping.store(false, std::memory_order_relaxed);
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}
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Mixer::MixerFifo::StereoPair Mixer::MixerFifo::Granule::InterpStereoPair(const Granule& prev,
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const Granule& next,
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const u32 frac)
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void Mixer::MixerFifo::Dequeue(Granule* granule)
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{
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const std::size_t prev_index = frac >> Mixer::MixerFifo::GRANULE_BUFFER_FRAC_BITS;
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const std::size_t next_index = prev_index - (GRANULE_BUFFER_SIZE / 2);
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const std::size_t granule_queue_size = m_granule_queue_size.load(std::memory_order_relaxed);
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const std::size_t head = m_queue_head.load(std::memory_order_acquire);
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std::size_t tail = m_queue_tail.load(std::memory_order_acquire);
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const u32 frac_t = frac & ((1 << GRANULE_BUFFER_FRAC_BITS) - 1);
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const float t1 = frac_t / static_cast<float>(1 << GRANULE_BUFFER_FRAC_BITS);
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const float t2 = t1 * t1;
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const float t3 = t2 * t1;
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// Checks to see if the queue has gotten too long.
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if (granule_queue_size < ((head - tail) & GRANULE_QUEUE_MASK))
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{
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// Jump the playhead to half the queue size behind the head.
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const std::size_t gap = (granule_queue_size >> 1) + 1;
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tail = (head - gap) & GRANULE_QUEUE_MASK;
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}
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// The Granules are pre-windowed, so we can just add them together
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StereoPair s0 = prev.m_buffer[(prev_index - 2) & GRANULE_BUFFER_MASK] +
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next.m_buffer[(next_index - 2) & GRANULE_BUFFER_MASK];
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StereoPair s1 = prev.m_buffer[(prev_index - 1) & GRANULE_BUFFER_MASK] +
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next.m_buffer[(next_index - 1) & GRANULE_BUFFER_MASK];
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StereoPair s2 = prev.m_buffer[(prev_index + 0) & GRANULE_BUFFER_MASK] +
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next.m_buffer[(next_index + 0) & GRANULE_BUFFER_MASK];
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StereoPair s3 = prev.m_buffer[(prev_index + 1) & GRANULE_BUFFER_MASK] +
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next.m_buffer[(next_index + 1) & GRANULE_BUFFER_MASK];
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StereoPair s4 = prev.m_buffer[(prev_index + 2) & GRANULE_BUFFER_MASK] +
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next.m_buffer[(next_index + 2) & GRANULE_BUFFER_MASK];
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StereoPair s5 = prev.m_buffer[(prev_index + 3) & GRANULE_BUFFER_MASK] +
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next.m_buffer[(next_index + 3) & GRANULE_BUFFER_MASK];
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// Checks to see if the queue is empty.
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std::size_t next_tail = (tail + 1) & GRANULE_QUEUE_MASK;
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if (next_tail == head)
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{
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// Only fill gaps when running to prevent stutter on pause.
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const bool is_running = Core::GetState(Core::System::GetInstance()) == Core::State::Running;
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if (m_mixer->m_config_fill_audio_gaps && is_running)
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{
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// Jump the playhead to half the queue size behind the head.
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// This provides smoother audio playback than suddenly stopping.
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const std::size_t gap = std::max<std::size_t>(2, granule_queue_size >> 1) - 1;
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next_tail = (head - gap) & GRANULE_QUEUE_MASK;
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m_queue_looping.store(true, std::memory_order_relaxed);
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}
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else
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{
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std::fill(granule->begin(), granule->end(), StereoPair{0.0f, 0.0f});
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m_queue_looping.store(false, std::memory_order_relaxed);
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return;
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}
|
||||
}
|
||||
|
||||
s0 *= StereoPair{(+0.0f + 1.0f * t1 - 2.0f * t2 + 1.0f * t3) / 12.0f};
|
||||
s1 *= StereoPair{(+0.0f - 8.0f * t1 + 15.0f * t2 - 7.0f * t3) / 12.0f};
|
||||
s2 *= StereoPair{(+3.0f + 0.0f * t1 - 7.0f * t2 + 4.0f * t3) / 3.0f};
|
||||
s3 *= StereoPair{(+0.0f + 2.0f * t1 + 5.0f * t2 - 4.0f * t3) / 3.0f};
|
||||
s4 *= StereoPair{(+0.0f - 1.0f * t1 - 6.0f * t2 + 7.0f * t3) / 12.0f};
|
||||
s5 *= StereoPair{(+0.0f + 0.0f * t1 + 1.0f * t2 - 1.0f * t3) / 12.0f};
|
||||
|
||||
return s0 + s1 + s2 + s3 + s4 + s5;
|
||||
*granule = m_queue[tail];
|
||||
m_queue_tail.store(next_tail, std::memory_order_release);
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user