diff options
Diffstat (limited to 'editor/import')
| -rw-r--r-- | editor/import/resource_importer_wav.cpp | 28 |
1 files changed, 21 insertions, 7 deletions
diff --git a/editor/import/resource_importer_wav.cpp b/editor/import/resource_importer_wav.cpp index 03155b3a48..debdeb1c4a 100644 --- a/editor/import/resource_importer_wav.cpp +++ b/editor/import/resource_importer_wav.cpp @@ -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; |