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61 lines
4.2 KiB
61 lines
4.2 KiB
/*
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dtx.h
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Copyright (C) 2015 Belledonne Communications, Grenoble, France
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Author : Johan Pascal
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef DTX_H
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#define DTX_H
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/*****************************************************************************/
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/* initBcg729DTXChannel : create context structure and initialise it */
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/* return value : */
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/* - the DTX channel context data */
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/* */
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/*****************************************************************************/
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bcg729DTXChannelContextStruct *initBcg729DTXChannel();
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/*******************************************************************************************/
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/* updateDTXContext : save autocorrelation value in DTX context as requested in B4.1.1 */
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/* parameters: */
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/* -(i/o) DTXChannelContext : the DTX context to be updated */
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/* -(i) autocorrelationsCoefficients : 11 values of variable scale, values are copied */
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/* in DTX context */
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/* -(i) autocorrelationCoefficientsScale : the scale of previous buffer(can be <0) */
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/* */
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/*******************************************************************************************/
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void updateDTXContext(bcg729DTXChannelContextStruct *DTXChannelContext, word32_t *autocorrelationCoefficients, int8_t autocorrelationCoefficientsScale);
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/*******************************************************************************************/
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/* encodeSIDFrame: called at eache frame even if VADflag is set to active speech */
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/* Update the previousVADflag and if curent is set to NOISE, compute the SID params */
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/* parameters: */
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/* -(i/o) DTXChannelContext: current DTX context, is updated by this function */
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/* -(o) previousLSPCoefficients : 10 values in Q15, is updated by this function */
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/* -(i/o) previousqLSPCoefficients : 10 values in Q15, is updated by this function */
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/* -(i) VADflag : 1 active voice frame, 0 noise frame */
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/* -(i/o) previousqLSF : set of 4 last frames qLSF in Q2.13, is updated */
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/* -(i/o) excicationVector : in Q0, accessed in range [-L_PAST_EXCITATION,L_FRAME-1] */
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/* -(o) qLPCoefficients : 20 values in Q3.12 the quantized LP coefficients */
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/* -(o) bitStream : SID frame parameters on 2 bytes, may be null if no frame is to be */
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/* transmitted */
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/* -(o) bitStreamLength : length of bitStream buffer to be transmitted (2 for SID, 0 for */
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/* untransmitted frame) */
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/* */
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/*******************************************************************************************/
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void encodeSIDFrame(bcg729DTXChannelContextStruct *DTXChannelContext, word16_t *previousLSPCoefficients, word16_t *previousqLSPCoefficients, uint8_t VADflag, word16_t previousqLSF[MA_MAX_K][NB_LSP_COEFF], word16_t *excitationVector, word16_t *qLPCoefficients, uint8_t *bitStream, uint8_t *bitStreamLength);
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#endif /* ifndef DTX_H */
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