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AudioStream: Improve >100% volume output quality

This commit is contained in:
Stenzek 2024-05-15 22:11:47 +10:00
parent f0a4ceb909
commit 0a38c0889e
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1 changed files with 51 additions and 5 deletions
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56
src/util/audio_stream.cpp
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@ -88,7 +88,8 @@ std::vector<std::pair<std::string, std::string>> AudioStream::GetDriverNames(Aud
return ret;
}
std::vector<AudioStream::DeviceInfo> AudioStream::GetOutputDevices(AudioBackend backend, const char* driver, u32 sample_rate)
std::vector<AudioStream::DeviceInfo> AudioStream::GetOutputDevices(AudioBackend backend, const char* driver,
u32 sample_rate)
{
std::vector<AudioStream::DeviceInfo> ret;
switch (backend)
@ -367,12 +368,57 @@ void AudioStream::ReadFrames(SampleType* samples, u32 num_frames)
if (m_volume != 100)
{
const s32 volume_mult = static_cast<s32>((static_cast<float>(m_volume) / 100.0f) * 32768.0f);
u32 num_samples = num_frames * m_output_channels;
#if defined(CPU_ARCH_SSE)
const u32 aligned_samples = Common::AlignDownPow2(num_samples, 8);
num_samples -= aligned_samples;
const __m128 volume_multv = _mm_set1_ps(m_volume / 100.0f);
const SampleType* const aligned_samples_end = samples + aligned_samples;
for (; samples != aligned_samples_end; samples += 8)
{
__m128i iv = _mm_loadu_si128(reinterpret_cast<const __m128i*>(samples));
__m128i iv1 = _mm_unpacklo_epi16(iv, iv); // [0, 0, 1, 1, 2, 2, 3, 3]
__m128i iv2 = _mm_unpackhi_epi16(iv, iv); // [4, 4, 5, 5, 6, 6, 7, 7]
iv1 = _mm_srai_epi32(iv1, 16); // [0, 1, 2, 3]
iv2 = _mm_srai_epi32(iv2, 16); // [4, 5, 6, 7]
__m128 fv1 = _mm_cvtepi32_ps(iv1); // [f0, f1, f2, f3]
__m128 fv2 = _mm_cvtepi32_ps(iv2); // [f4, f5, f6, f7]
fv1 = _mm_mul_ps(fv1, volume_multv); // [f0, f1, f2, f3]
fv2 = _mm_mul_ps(fv2, volume_multv); // [f4, f5, f6, f7]
iv1 = _mm_cvtps_epi32(fv1); // [0, 1, 2, 3]
iv2 = _mm_cvtps_epi32(fv2); // [4, 5, 6, 7]
iv = _mm_packs_epi32(iv1, iv2); // [0, 1, 2, 3, 4, 5, 6, 7]
_mm_storeu_si128(reinterpret_cast<__m128i*>(samples), iv);
}
#elif defined(CPU_ARCH_NEON)
const u32 aligned_samples = Common::AlignDownPow2(num_samples, 8);
num_samples -= aligned_samples;
const float32x4_t volume_multv = vdupq_n_f32(m_volume / 100.0f);
const SampleType* const aligned_samples_end = samples + aligned_samples;
for (; samples != aligned_samples_end; samples += 8)
{
int16x8_t iv = vld1q_s16(samples);
int32x4_t iv1 = vreinterpretq_s32_s16(vzip1q_s16(iv, iv)); // [0, 0, 1, 1, 2, 2, 3, 3]
int32x4_t iv2 = vreinterpretq_s32_s16(vzip2q_s16(iv, iv)); // [4, 4, 5, 5, 6, 6, 7, 7]
iv1 = vshrq_n_s32(iv1, 16); // [0, 1, 2, 3]
iv2 = vshrq_n_s32(iv2, 16); // [4, 5, 6, 7]
float32x4_t fv1 = vcvtq_f32_s32(iv1); // [f0, f1, f2, f3]
float32x4_t fv2 = vcvtq_f32_s32(iv2); // [f4, f5, f6, f7]
fv1 = vmulq_f32(fv1, volume_multv); // [f0, f1, f2, f3]
fv2 = vmulq_f32(fv2, volume_multv); // [f4, f5, f6, f7]
iv1 = vcvtq_s32_f32(fv1); // [0, 1, 2, 3]
iv2 = vcvtq_s32_f32(fv2); // [4, 5, 6, 7]
iv = vcombine_s16(vqmovn_s32(iv1), vqmovn_s32(iv2)); // [0, 1, 2, 3, 4, 5, 6, 7]
vst1q_s16(samples, iv);
}
#endif
const float volume_mult = static_cast<float>(m_volume) / 100.0f;
while (num_samples > 0)
{
*samples = static_cast<s16>((static_cast<s32>(*samples) * volume_mult) >> 15);
*samples = static_cast<s16>(std::clamp(static_cast<float>(*samples) * volume_mult, -32768.0f, 32767.0f));
samples++;
num_samples--;
}
@ -572,7 +618,7 @@ static void S16ChunkToFloat(const s16* src, float* dst, u32 num_samples)
const u32 iterations = (num_samples + 7) / 8;
for (u32 i = 0; i < iterations; i++)
{
const int16x8_t sv = vreinterpretq_s16_s32(vld1q_s16(src));
const int16x8_t sv = vld1q_s16(src);
src += 8;
int32x4_t iv1 = vreinterpretq_s32_s16(vzip1q_s16(sv, sv)); // [0, 0, 1, 1, 2, 2, 3, 3]