diff options
Diffstat (limited to 'protocols/Tlen/codec/gsm_preprocess.c')
| -rw-r--r-- | protocols/Tlen/codec/gsm_preprocess.c | 103 |
1 files changed, 0 insertions, 103 deletions
diff --git a/protocols/Tlen/codec/gsm_preprocess.c b/protocols/Tlen/codec/gsm_preprocess.c deleted file mode 100644 index b3d11bb7b1..0000000000 --- a/protocols/Tlen/codec/gsm_preprocess.c +++ /dev/null @@ -1,103 +0,0 @@ -/*
-
-Tlen Protocol Plugin for Miranda IM
-Copyright (C) 2004-2007 Piotr Piastucki
-
-This program is based on GSM 06.10 source code developed by
-Jutta Degener and Carsten Bormann,
-Copyright 1992, 1993, 1994 by Jutta Degener and Carsten Bormann,
-Technische Universitaet Berlin
-
-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.
-
-*/
-#include "gsm.h"
-#include <stdio.h>
-
-/* 4.2.0 .. 4.2.3 PREPROCESSING SECTION
- *
- * After A-law to linear conversion (or directly from the
- * Ato D converter) the following scaling is assumed for
- * input to the RPE-LTP algorithm:
- *
- *
- * Where S is the sign bit, v a valid bit, and * a "don't care" bit.
- * The original signal is called sop[..]
- *
- */
-
-
-void gsm_preprocessing( gsm_state *state, short *in, short *out)
-{
- int z1 = state->z1;
- int z2 = state->z2;
- int mp = state->mp;
- int so, s1;
- int msp, lsp;
-
- int k = 160;
-
- while (k--) {
- /* Downscaling of the input signal
- * in: 0.1.....................12
- * S.v.v.v.v.v.v.v.v.v.v.v.v.*.*.*
- * out: 0.1................... 12
- * S.S.v.v.v.v.v.v.v.v.v.v.v.v.0.0
- */
- so = (*in >> 3) << 2;
- in++;
- /* 4.2.2 Offset compensation
- *
- * This part implements a high-pass filter and requires extended
- * arithmetic precision for the recursive part of this filter.
- * The input of this procedure is the array so[0...159] and the
- * output the array sof[ 0...159 ].
- */
- /* Compute the non-recursive part
- */
- s1 = (so - z1) << 15;
- z1 = so;
- msp = z2 >> 15;
- lsp = z2 - (msp << 15);
- s1 += ((lsp * 32735) + 16384) >> 15;
- z2 = msp * 32735 + s1;
- /* 4.2.3 Preemphasis
- */
- msp = (-28180 * mp + 16384) >> 15;
- mp = (z2 + 16384) >> 15;
- *out++ = mp + msp;
- }
- state->z1 = z1;
- state->z2 = z2;
- state->mp = mp;
-/*
- printf("preprocessed: \n");
- for (k=0;k<160;k++) {
- printf("%7d ", out[k]);//((float)i_lpc[i])/32768.0f);
- }
- printf("\n");
- */
-}
-
-void gsm_postprocessing( gsm_state *state, short *in, short *out)
-{
- int k;
- int msr = state->msr;
- for (k = 160; k--; in++, out++) {
- msr = *in + ((msr * 28180 + 16384) >>15); /* Deemphasis */
- *out = (msr + msr ) & 0xFFF8; /* Truncation & Upscaling */
- }
- state->msr = msr;
-}
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