Author: reynaldo
Date: Tue Aug 14 05:54:16 2007
New Revision: 762
Log:
Implements the adaptive postifilter at output stage and modifies
the previously drafted qcelp_detilt accordingly.
Modified:
qcelp/qcelpdec.c
Modified: qcelp/qcelpdec.c
==============================================================================
--- qcelp/qcelpdec.c (original)
+++ qcelp/qcelpdec.c Tue Aug 14 05:54:16 2007
@@ -577,11 +577,14 @@ static float qcelp_prede_filter(float *l
/**
* 2.4.8.6-2
- * Used after the adaptive postfilter at sample generation stage.
+ * Used in the adaptive postfilter at sample generation stage.
*/
-static void qcelp_detilt(float *z)
+static float qcelp_detilt(float z)
{
- *z = 1.0/(1.0 + 0.3 / *z);
+ if(z)
+ return (1.0/(1.0 + 0.3 / z));
+ else
+ return 0;
}
static int qcelp_decode_frame(AVCodecContext *avctx, void *data,
@@ -842,7 +845,13 @@ static int qcelp_decode_frame(AVCodecCon
qcelp_lsp2lpc(avctx, interpolated_lspf, lpc);
}
+ /* formant */
ppf_vector[i]=1.0/qcelp_prede_filter(lpc, ppf_vector[i]);
+ /* adaptive postfilter */
+ ppf_vector[i]=qcelp_detilt(ppf_vector[i])*
+ qcelp_prede_filter(lpc, ppf_vector[i]/0.625)/
+ qcelp_prede_filter(lpc, ppf_vector[i]/0.775);
+
av_log(avctx, AV_LOG_DEBUG, " %f/", ppf_vector[i]);
/* WIP adaptive postfilter here */
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