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56 lines
3.7 KiB
56 lines
3.7 KiB
/*
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cng.h
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Copyright (C) 2011 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 CNG_H
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#define CNG_H
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/*****************************************************************************/
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/* initBcg729CNGChannel : create context structure and initialise it */
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/* return value : */
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/* - the CNG channel context data */
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/* */
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/*****************************************************************************/
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bcg729CNGChannelContextStruct *initBcg729CNGChannel();
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void computeComfortNoiseExcitationVector(word16_t targetGain, uint16_t *randomGeneratorSeed, word16_t *excitationVector);
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/*******************************************************************************************/
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/* decodeSIDframe : as is spec B4.4 and B4.5 */
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/* first check if we have a SID frame or a missing/untransmitted frame */
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/* for SID frame get paremeters(gain and LSP) */
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/* Then generate excitation vector and update qLSP */
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/* parameters: */
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/* -(i/o):CNGChannelContext : context containing all informations needed for CNG */
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/* -(i): previousFrameIsActiveFlag: true if last decoded frame was an active one */
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/* -(i): bitStream: for SID frame contains received params as in spec B4.3, */
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/* NULL for missing/untransmitted frame */
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/* -(i): bitStreamLength : in bytes, length of previous buffer */
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/* -(i/o): excitationVector in Q0, accessed in range [-L_PAST_EXCITATION,L_FRAME-1] */
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/* [-154,79] */
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/* -(i/o): previousqLSP : previous quantised LSP in Q0.15 (NB_LSP_COEFF values) */
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/* -(o): LP: 20 LP coefficients in Q12 */
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/* -(i/o): pseudoRandomSeed : seed used in the pseudo random number generator */
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/* -(i/o): previousLCodeWord: in Q2.13, buffer to store the last 4 frames codewords, */
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/* used to compute the current qLSF */
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/* -(i) rfc3389PayloadFlag: true when CN payload follow rfc3389 */
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/* */
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/*******************************************************************************************/
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void decodeSIDframe(bcg729CNGChannelContextStruct *CNGChannelContext, uint8_t previousFrameIsActiveFlag, uint8_t *bitStream, uint8_t bitStreamLength, word16_t *excitationVector, word16_t *previousqLSP, word16_t *LP, uint16_t *pseudoRandomSeed, word16_t previousLCodeWord[MA_MAX_K][NB_LSP_COEFF], uint8_t rfc3389PayloadFlag);
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#endif /* ifndef CNG_H */
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