061991fe60
it appears a one-character typo in the cmake_minimum_required line prevents it from compiling under CMake 4.0. in order to fix that, I had to take this thing out of submodules... it is recommended to do this after you pull; git submodule deinit extern/libsndfile
87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
/*
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* Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
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* Universitaet Berlin. See the accompanying file "COPYRIGHT" for
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* details. THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "gsm610_priv.h"
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/*
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* 4.2 FIXED POINT IMPLEMENTATION OF THE RPE-LTP CODER
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*/
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void Gsm_Coder (
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struct gsm_state * State,
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int16_t * s, /* [0..159] samples IN */
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/*
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* The RPE-LTD coder works on a frame by frame basis. The length of
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* the frame is equal to 160 samples. Some computations are done
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* once per frame to produce at the output of the coder the
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* LARc [1..8] parameters which are the coded LAR coefficients and
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* also to realize the inverse filtering operation for the entire
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* frame (160 samples of signal d [0..159]). These parts produce at
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* the output of the coder:
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*/
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int16_t * LARc, /* [0..7] LAR coefficients OUT */
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/*
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* Procedure 4.2.11 to 4.2.18 are to be executed four times per
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* frame. That means once for each sub-segment RPE-LTP analysis of
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* 40 samples. These parts produce at the output of the coder:
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*/
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int16_t *Nc, /* [0..3] LTP lag OUT */
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int16_t *bc, /* [0..3] coded LTP gain OUT */
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int16_t *Mc, /* [0..3] RPE grid selection OUT */
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int16_t *xmaxc, /* [0..3] Coded maximum amplitude OUT */
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int16_t *xMc /* [13*4] normalized RPE samples OUT */
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)
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{
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int k ;
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int16_t *dp = State->dp0 + 120 ; /* [-120...-1] */
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int16_t *dpp = dp ; /* [0...39] */
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int16_t so [160] ;
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Gsm_Preprocess (State, s, so) ;
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Gsm_LPC_Analysis (State, so, LARc) ;
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Gsm_Short_Term_Analysis_Filter (State, LARc, so) ;
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for (k = 0 ; k <= 3 ; k++, xMc += 13)
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{ Gsm_Long_Term_Predictor (State,
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so+k*40, /* d [0..39] IN */
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dp, /* dp [-120..-1] IN */
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State->e + 5, /* e [0..39] OUT */
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dpp, /* dpp [0..39] OUT */
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Nc++,
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bc++) ;
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Gsm_RPE_Encoding (/*-S,-*/
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State->e + 5, /* e ][0..39][IN/OUT */
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xmaxc++, Mc++, xMc) ;
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/*
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* Gsm_Update_of_reconstructed_short_time_residual_signal
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* (dpp, State->e + 5, dp) ;
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*/
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{
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register int i ;
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for (i = 0 ; i <= 39 ; i++)
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dp [i] = GSM_ADD (State->e [5 + i], dpp [i]) ;
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}
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dp += 40 ;
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dpp += 40 ;
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}
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memcpy ((char *) State->dp0, (char *) (State->dp0 + 160),
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120 * sizeof (*State->dp0)) ;
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}
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