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Resampler: Move a division out of an inner loop.

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This commit is contained in:
David Reid
2026-02-04 17:00:09 +10:00
parent 2683601481
commit 2c14e2e5a7
1 changed files with 8 additions and 5 deletions
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miniaudio.h
+8 -5
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@@ -59189,8 +59189,7 @@ static void ma_linear_resampler_interpolate_frame_s16(ma_linear_resampler* pResa
} }
} }
static void ma_linear_resampler_interpolate_frame_f32(ma_linear_resampler* pResampler, float invSampleRateOut, float* MA_RESTRICT pFrameOut)
static void ma_linear_resampler_interpolate_frame_f32(ma_linear_resampler* pResampler, float* MA_RESTRICT pFrameOut)
{ {
ma_uint32 c; ma_uint32 c;
float a; float a;
@@ -59199,7 +59198,7 @@ static void ma_linear_resampler_interpolate_frame_f32(ma_linear_resampler* pResa
MA_ASSERT(pResampler != NULL); MA_ASSERT(pResampler != NULL);
MA_ASSERT(pFrameOut != NULL); MA_ASSERT(pFrameOut != NULL);
a = (float)pResampler->inTimeFrac / pResampler->config.sampleRateOut; a = (float)pResampler->inTimeFrac * invSampleRateOut;
MA_ASSUME(channels > 0); MA_ASSUME(channels > 0);
for (c = 0; c < channels; c += 1) { for (c = 0; c < channels; c += 1) {
@@ -59380,6 +59379,7 @@ static ma_result ma_linear_resampler_process_pcm_frames_f32_downsample(ma_linear
ma_uint64 frameCountOut; ma_uint64 frameCountOut;
ma_uint64 framesProcessedIn; ma_uint64 framesProcessedIn;
ma_uint64 framesProcessedOut; ma_uint64 framesProcessedOut;
float invSampleRateOut;
MA_ASSERT(pResampler != NULL); MA_ASSERT(pResampler != NULL);
MA_ASSERT(pFrameCountIn != NULL); MA_ASSERT(pFrameCountIn != NULL);
@@ -59391,6 +59391,7 @@ static ma_result ma_linear_resampler_process_pcm_frames_f32_downsample(ma_linear
frameCountOut = *pFrameCountOut; frameCountOut = *pFrameCountOut;
framesProcessedIn = 0; framesProcessedIn = 0;
framesProcessedOut = 0; framesProcessedOut = 0;
invSampleRateOut = 1.0f / pResampler->sampleRateOut;
while (framesProcessedOut < frameCountOut) { while (framesProcessedOut < frameCountOut) {
/* Before interpolating we need to load the buffers. When doing this we need to ensure we run every input sample through the filter. */ /* Before interpolating we need to load the buffers. When doing this we need to ensure we run every input sample through the filter. */
@@ -59426,7 +59427,7 @@ static ma_result ma_linear_resampler_process_pcm_frames_f32_downsample(ma_linear
/* Getting here means the frames have been loaded and filtered and we can generate the next output frame. */ /* Getting here means the frames have been loaded and filtered and we can generate the next output frame. */
if (pFramesOutF32 != NULL) { if (pFramesOutF32 != NULL) {
MA_ASSERT(pResampler->inTimeInt == 0); MA_ASSERT(pResampler->inTimeInt == 0);
ma_linear_resampler_interpolate_frame_f32(pResampler, pFramesOutF32); ma_linear_resampler_interpolate_frame_f32(pResampler, invSampleRateOut, pFramesOutF32);
pFramesOutF32 += pResampler->channels; pFramesOutF32 += pResampler->channels;
} }
@@ -59456,6 +59457,7 @@ static ma_result ma_linear_resampler_process_pcm_frames_f32_upsample(ma_linear_r
ma_uint64 frameCountOut; ma_uint64 frameCountOut;
ma_uint64 framesProcessedIn; ma_uint64 framesProcessedIn;
ma_uint64 framesProcessedOut; ma_uint64 framesProcessedOut;
float invSampleRateOut;
MA_ASSERT(pResampler != NULL); MA_ASSERT(pResampler != NULL);
MA_ASSERT(pFrameCountIn != NULL); MA_ASSERT(pFrameCountIn != NULL);
@@ -59467,6 +59469,7 @@ static ma_result ma_linear_resampler_process_pcm_frames_f32_upsample(ma_linear_r
frameCountOut = *pFrameCountOut; frameCountOut = *pFrameCountOut;
framesProcessedIn = 0; framesProcessedIn = 0;
framesProcessedOut = 0; framesProcessedOut = 0;
invSampleRateOut = 1.0f / pResampler->sampleRateOut;
while (framesProcessedOut < frameCountOut) { while (framesProcessedOut < frameCountOut) {
/* Before interpolating we need to load the buffers. */ /* Before interpolating we need to load the buffers. */
@@ -59497,7 +59500,7 @@ static ma_result ma_linear_resampler_process_pcm_frames_f32_upsample(ma_linear_r
/* Getting here means the frames have been loaded and we can generate the next output frame. */ /* Getting here means the frames have been loaded and we can generate the next output frame. */
if (pFramesOutF32 != NULL) { if (pFramesOutF32 != NULL) {
MA_ASSERT(pResampler->inTimeInt == 0); MA_ASSERT(pResampler->inTimeInt == 0);
ma_linear_resampler_interpolate_frame_f32(pResampler, pFramesOutF32); ma_linear_resampler_interpolate_frame_f32(pResampler, invSampleRateOut, pFramesOutF32);
/* Filter. Do not apply filtering if sample rates are the same or else you'll get dangerous glitching. */ /* Filter. Do not apply filtering if sample rates are the same or else you'll get dangerous glitching. */
if (pResampler->inAdvanceInt == 1 && pResampler->inAdvanceFrac == 0) { if (pResampler->inAdvanceInt == 1 && pResampler->inAdvanceFrac == 0) {