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Fixed wave file importer's broken resampling.

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This commit is contained in:
L. Nikko 2018-02-02 00:12:36 +02:00
parent 0033e72a0f
commit 51d0f630d9
1 changed files with 21 additions and 7 deletions
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28
editor/import/resource_importer_wav.cpp
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@ -304,17 +304,23 @@ Error ResourceImporterWAV::import(const String &p_source_file, const String &p_s
int limit_rate_hz = p_options["force/max_rate_hz"];
if (limit_rate && rate > limit_rate_hz && rate > 0 && frames > 0) {
//resampleeee!!!
int new_data_frames = frames * limit_rate_hz / rate;
int new_data_frames = (int)(frames * (float)limit_rate_hz / (float)rate);
print_line("\tresampling ratio: " + rtos((float)limit_rate_hz / (float)rate));
print_line("\tnew frames: " + itos(new_data_frames));
Vector<float> new_data;
new_data.resize(new_data_frames * format_channels);
for (int c = 0; c < format_channels; c++) {
float frac = .0f;
int ipos = 0;
for (int i = 0; i < new_data_frames; i++) {
//simple cubic interpolation should be enough.
float pos = float(i) * frames / new_data_frames;
float mu = pos - Math::floor(pos);
int ipos = int(Math::floor(pos));
float mu = frac;
float y0 = data[MAX(0, ipos - 1) * format_channels + c];
float y1 = data[ipos * format_channels + c];
@ -330,14 +336,22 @@ Error ResourceImporterWAV::import(const String &p_source_file, const String &p_s
float res = (a0 * mu * mu2 + a1 * mu2 + a2 * mu + a3);
new_data[i * format_channels + c] = res;
// update position and always keep fractional part within ]0...1]
// in order to avoid 32bit floating point precision errors
frac += (float)rate / (float)limit_rate_hz;
int tpos = (int)Math::floor(frac);
ipos += tpos;
frac -= tpos;
}
}
if (loop) {
loop_begin = loop_begin * new_data_frames / frames;
loop_end = loop_end * new_data_frames / frames;
loop_begin = (int)(loop_begin * (float)new_data_frames / (float)frames);
loop_end = (int)(loop_end * (float)new_data_frames / (float)frames);
}
data = new_data;
rate = limit_rate_hz;
frames = new_data_frames;