Changeset 79c2e52 for src

Timestamp:

Aug 22, 2005, 10:59:13 PM (19 years ago)

Author:

Paul Brossier <piem@altern.org>

Branches:

feature/autosink, feature/cnn, feature/cnn_org, feature/constantq, feature/crepe, feature/crepe_org, feature/pitchshift, feature/pydocstrings, feature/timestretch, fix/ffmpeg5, master, pitchshift, sampler, timestretch, yinfft+

Children:

3ec9d9c

Parents:

98ef4df

Message:

added bintomidi, freqtobin, miditofreq

Location:

src

Files:

• mathutils.c (modified) (2 diffs)
• mathutils.h (modified) (1 diff)

src/mathutils.c

@@ -346 +346 @@
 
 smpl_t aubio_freqtomidi(smpl_t freq) {
-  smpl_t midi = freq/6.875;
-  /* log(freq/A-2)/log(2) */
-  midi = LOG(midi)/0.69314718055995;
-  midi *= 12;
-  midi -= 3;  
-  return midi;
+        /* log(freq/A-2)/log(2) */
+        smpl_t midi = freq/6.875;
+        midi = LOG(midi)/0.69314718055995;
+        midi *= 12;
+        midi -= 3;  
+        return midi;
+}
+
+smpl_t aubio_miditofreq(smpl_t midi) {
+        smpl_t freq = (midi+3.)/12.;
+        freq = EXP(freq*0.69314718055995);
+        freq *= 6.875;
+        return freq;
 }
 
@@ -359 +366 @@
 }
 
-
 smpl_t aubio_bintomidi(smpl_t bin, smpl_t samplerate, smpl_t fftsize) {
   smpl_t midi = aubio_bintofreq(bin,samplerate,fftsize);
   return aubio_freqtomidi(midi);
+}
+
+smpl_t aubio_freqtobin(smpl_t freq, smpl_t samplerate, smpl_t fftsize) {
+  smpl_t bin = fftsize/samplerate;
+  return freq*bin;
+}
+
+smpl_t aubio_miditobin(smpl_t midi, smpl_t samplerate, smpl_t fftsize) {
+  smpl_t freq = aubio_miditofreq(midi);
+  return aubio_freqtobin(freq,samplerate,fftsize);
 }
 

src/mathutils.h

@@ -231 +231 @@
 
 smpl_t aubio_bintomidi(smpl_t bin, smpl_t samplerate, smpl_t fftsize);
+smpl_t aubio_miditobin(smpl_t midi, smpl_t samplerate, smpl_t fftsize);
 smpl_t aubio_bintofreq(smpl_t bin, smpl_t samplerate, smpl_t fftsize);
+smpl_t aubio_freqtobin(smpl_t freq, smpl_t samplerate, smpl_t fftsize);
 smpl_t aubio_freqtomidi(smpl_t freq);
+smpl_t aubio_miditofreq(smpl_t midi);
 
 uint_t aubio_silence_detection(fvec_t * ibuf, smpl_t threshold);