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Fixed ResampleAudio interpolation factor calculation

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Brick
2023-08-22 11:26:39 +01:00
committed by Ryan C. Gordon
parent 4983638630
commit e6c878824c
2 changed files with 8 additions and 5 deletions
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src/audio/SDL_audiocvt.c
+5 -2
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@@ -76,6 +76,9 @@ static int GetHistoryBufferSampleFrames(const int required_resampler_frames)
return RESAMPLER_MAX_PADDING_FRAMES; return RESAMPLER_MAX_PADDING_FRAMES;
} }
#define RESAMPLER_FILTER_INTERP_BITS (32 - RESAMPLER_BITS_PER_ZERO_CROSSING)
#define RESAMPLER_FILTER_INTERP_RANGE (1 << RESAMPLER_FILTER_INTERP_BITS)
// lpadding and rpadding are expected to be buffers of (GetResamplerPaddingFrames(resample_rate) * chans * sizeof (float)) bytes. // lpadding and rpadding are expected to be buffers of (GetResamplerPaddingFrames(resample_rate) * chans * sizeof (float)) bytes.
static void ResampleAudio(const int chans, const float *lpadding, const float *rpadding, static void ResampleAudio(const int chans, const float *lpadding, const float *rpadding,
const float *inbuf, const int inframes, float *outbuf, const int outframes, const float *inbuf, const int inframes, float *outbuf, const int outframes,
@@ -95,9 +98,9 @@ static void ResampleAudio(const int chans, const float *lpadding, const float *r
SDL_assert(srcindex >= -1 && srcindex < inframes); SDL_assert(srcindex >= -1 && srcindex < inframes);
const int filterindex = (int)(srcfraction >> (32 - RESAMPLER_BITS_PER_ZERO_CROSSING)) * RESAMPLER_ZERO_CROSSINGS; const int filterindex = (int)(srcfraction >> RESAMPLER_FILTER_INTERP_BITS) * RESAMPLER_ZERO_CROSSINGS;
const float interpolation1 = (float)srcfraction * 0x1p-32f; const float interpolation1 = (float)(srcfraction & (RESAMPLER_FILTER_INTERP_RANGE - 1)) * (1.0f / RESAMPLER_FILTER_INTERP_RANGE);
const float interpolation2 = 1.0f - interpolation1; const float interpolation2 = 1.0f - interpolation1;
for (chan = 0; chan < chans; ++chan) { for (chan = 0; chan < chans; ++chan) {
test/testautomation_audio.c
+3 -3
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@@ -794,10 +794,10 @@ static int audio_resampleLoss(void *arg)
double signal_to_noise; double signal_to_noise;
double max_error; double max_error;
} test_specs[] = { } test_specs[] = {
{ 50, 440, 0, 44100, 48000, 79, 0.0008 }, { 50, 440, 0, 44100, 48000, 80, 0.0009 },
{ 50, 5000, SDL_PI_D / 2, 20000, 10000, 999, 0.0001 }, { 50, 5000, SDL_PI_D / 2, 20000, 10000, 999, 0.0001 },
{ 50, 440, 0, 22050, 96000, 76, 0.0120 }, { 50, 440, 0, 22050, 96000, 79, 0.0120 },
{ 50, 440, 0, 96000, 22050, 80, 0.0014 }, { 50, 440, 0, 96000, 22050, 80, 0.0002 },
{ 0 } { 0 }
}; };