From 30754b17df67a808e7c960d4f3c94a6b05557a17 Mon Sep 17 00:00:00 2001
From: Johnathan Corgan <jcorgan@corganenterprises.com>
Date: Mon, 18 Jul 2011 06:28:05 -0700
Subject: gr-vocoder: reimplemented gr-gsm-fr-vocoder in gr-vocoder
---
gr-vocoder/lib/gsm/decode.c | 63 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 63 insertions(+)
create mode 100644 gr-vocoder/lib/gsm/decode.c
(limited to 'gr-vocoder/lib/gsm/decode.c')
diff --git a/gr-vocoder/lib/gsm/decode.c b/gr-vocoder/lib/gsm/decode.c
new file mode 100644
index 0000000000..34e5586633
--- /dev/null
+++ b/gr-vocoder/lib/gsm/decode.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
+ * Universitaet Berlin. See the accompanying file "COPYRIGHT" for
+ * details. THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
+ */
+
+/* $Header$ */
+
+#include <stdio.h>
+
+#include "private.h"
+#include "gsm.h"
+#include "proto.h"
+
+/*
+ * 4.3 FIXED POINT IMPLEMENTATION OF THE RPE-LTP DECODER
+ */
+
+static void Postprocessing P2((S,s),
+ struct gsm_state * S,
+ register word * s)
+{
+ register int k;
+ register word msr = S->msr;
+ register longword ltmp; /* for GSM_ADD */
+ register word tmp;
+
+ for (k = 160; k--; s++) {
+ tmp = GSM_MULT_R( msr, 28180 );
+ msr = GSM_ADD(*s, tmp); /* Deemphasis */
+ *s = GSM_ADD(msr, msr) & 0xFFF8; /* Truncation & Upscaling */
+ }
+ S->msr = msr;
+}
+
+void Gsm_Decoder P8((S,LARcr, Ncr,bcr,Mcr,xmaxcr,xMcr,s),
+ struct gsm_state * S,
+
+ word * LARcr, /* [0..7] IN */
+
+ word * Ncr, /* [0..3] IN */
+ word * bcr, /* [0..3] IN */
+ word * Mcr, /* [0..3] IN */
+ word * xmaxcr, /* [0..3] IN */
+ word * xMcr, /* [0..13*4] IN */
+
+ word * s) /* [0..159] OUT */
+{
+ int j, k;
+ word erp[40], wt[160];
+ word * drp = S->dp0 + 120;
+
+ for (j=0; j <= 3; j++, xmaxcr++, bcr++, Ncr++, Mcr++, xMcr += 13) {
+
+ Gsm_RPE_Decoding( S, *xmaxcr, *Mcr, xMcr, erp );
+ Gsm_Long_Term_Synthesis_Filtering( S, *Ncr, *bcr, erp, drp );
+
+ for (k = 0; k <= 39; k++) wt[ j * 40 + k ] = drp[ k ];
+ }
+
+ Gsm_Short_Term_Synthesis_Filter( S, LARcr, wt, s );
+ Postprocessing(S, s);
+}
--
cgit v1.2.3