Change to using distutils.

Currently only builds the simplsndobj module

1 files changed, 76 insertions, 0 deletions

diff --git a/src/sms/residual.c b/src/sms/residual.c
new file mode 100644
index 0000000..0c720f0
--- /dev/null
+++ b/src/sms/residual.c
@@ -0,0 +1,76 @@
+/* 
+ * Copyright (c) 2008 MUSIC TECHNOLOGY GROUP (MTG)
+ *                         UNIVERSITAT POMPEU FABRA 
+ * 
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of 
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * 
+ */
+/*! \file residual.c
+ * \brief main sms_residual() function
+ */
+
+#include "sms.h"
+
+/*! \brief get the residual waveform
+ *
+ * \param sizeWindow size of buffers
+ * \param pSynthesis pointer to deterministic component
+ * \param pOriginal  pointer to original waveform
+ * \param pResidual  pointer to output residual waveform
+ * \param pWindow    pointer to windowing array
+ * \return residual percentage (0 if residual was not large enough)
+ */
+int sms_residual(int sizeWindow, sfloat *pSynthesis, sfloat *pOriginal,
+                 SMS_ResidualParams* residualParams)
+{
+    sfloat fScale = 1.;
+    sfloat fCurrentResidualMag = 0.;
+    sfloat fCurrentOriginalMag = 0.;
+    int i;
+
+    /* get residual */
+    for(i = 0; i < sizeWindow; i++)
+        residualParams->residual[i] = pOriginal[i] - pSynthesis[i];
+
+    /* get energy of residual */
+    for(i = 0; i < sizeWindow; i++)
+        fCurrentResidualMag += (residualParams->residual[i] * residualParams->residual[i]);
+
+    /* if residual is big enough compute coefficients */
+    if(fCurrentResidualMag)
+    {  
+        /* get energy of original */
+        for(i = 0; i < sizeWindow; i++)
+            fCurrentOriginalMag += (pOriginal[i] * pOriginal[i]);
+
+        residualParams->originalMag = 
+            .5 * (fCurrentOriginalMag/sizeWindow + residualParams->originalMag);
+        residualParams->residualMag = 
+            .5 * (fCurrentResidualMag/sizeWindow + residualParams->residualMag);
+
+        /* scale residual if need to be */
+        if(residualParams->residualMag > residualParams->originalMag)
+        {
+            fScale = residualParams->originalMag / residualParams->residualMag;
+            for(i = 0; i < sizeWindow; i++)
+                residualParams->residual[i] *= fScale;
+        }
+
+        return fCurrentResidualMag / fCurrentOriginalMag;
+    }
+    return 0;
+}
+