Changeset fabb7cd

Timestamp:

Nov 21, 2007, 12:01:22 PM (17 years ago)

Author:

Paul Brossier <piem@piem.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:

862d78f

Parents:

ec2fa2a

Message:

onsetdection.{c,h}: add spectral flux (L2 norm, only energy increases)

Location:

src

Files:

• onsetdetection.c (modified) (3 diffs)
• onsetdetection.h (modified) (2 diffs)

src/onsetdetection.c

@@ -196 +196 @@
 }
 
+/* Spectral flux */
+void aubio_onsetdetection_specflux(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset){ 
+  uint_t i, j;
+  for (i=0;i<fftgrain->channels;i++) {
+    onset->data[i][0] = 0.;
+    for (j=0;j<fftgrain->length;j++) {
+      if (fftgrain->norm[i][j] > o->oldmag->data[i][j])
+        onset->data[i][0] += fftgrain->norm[i][j] - o->oldmag->data[i][j];
+      o->oldmag->data[i][j] = fftgrain->norm[i][j];
+    }
+  }
+}
+
 /* Generic function pointing to the choosen one */
 void 
@@ -243 +256 @@
     case aubio_onset_kl:
     case aubio_onset_mkl:
+    case aubio_onset_specflux:
       o->oldmag = new_fvec(rsize,channels);
       break;
@@ -274 +288 @@
     case aubio_onset_mkl:
       o->funcpointer = aubio_onsetdetection_mkl;
+      break;
+    case aubio_onset_specflux:
+      o->funcpointer = aubio_onsetdetection_specflux;
       break;
     default:

src/onsetdetection.h

@@ -48 +48 @@
         aubio_onset_kl,             /**< Kullback Liebler */
         aubio_onset_mkl,            /**< modified Kullback Liebler */
+        aubio_onset_specflux,       /**< spectral flux */
 } aubio_onsetdetection_type;
 
@@ -137 +138 @@
 */
 void aubio_onsetdetection_mkl(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset);
+/** Spectral Flux 
+
+  Simon Dixon, Onset Detection Revisited, in ``Proceedings of the 9th
+  International Conference on Digital Audio Effects'' (DAFx-06), Montreal,
+  Canada, 2006. 
+
+  \param o onset detection object as returned by new_aubio_onsetdetection()
+  \param fftgrain input spectral frame
+  \param onset output onset detection function
+
+*/
+void aubio_onsetdetection_specflux(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset);
 /** execute onset detection function on a spectral frame