FreeCalypso > hg > gsm-codec-lib
view libgsmefr/e_homing.c @ 65:cb080ec1817e
libgsmefr: dec_lag6.c compiles
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 26 Nov 2022 02:50:06 +0000 |
parents | 49dd1ac8e75b |
children | aacdf352576c |
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/************************************************************************** * * File Name: e_homing.c * * Purpose: * This file contains the following functions: * * encoder_homing_frame_test() checks if a frame of input samples * matches the Encoder Homing Frame pattern. * * encoder_reset() called by reset_enc() to reset all * the state variables for the encoder. * * reset_enc() calls functions to reset the state * variables for the encoder and VAD, and * for the transmit DTX and Comfort Noise. * **************************************************************************/ #include "typedef.h" #include "cnst.h" #include "vad.h" #include "dtx.h" #include "codec.h" #include "sig_proc.h" #include "e_homing.h" /*************************************************************************** * * FUNCTION NAME: encoder_homing_frame_test * * PURPOSE: * Checks if a frame of input samples matches the Encoder Homing Frame * pattern, which is 0x0008 for all 160 samples in the frame. * * INPUT: * input_frame[] one frame of speech samples * * OUTPUT: * None * * RETURN: * 0 input frame does not match the Encoder Homing Frame pattern. * 1 input frame matches the Encoder Homing Frame pattern. * **************************************************************************/ Word16 encoder_homing_frame_test (Word16 input_frame[]) { Word16 i, j; for (i = 0; i < L_FRAME; i++) { j = input_frame[i] ^ EHF_MASK; if (j) break; } return !j; } /*************************************************************************** * * FUNCTION NAME: encoder_reset * * PURPOSE: * resets all of the state variables for the encoder * * INPUT: * None * * OUTPUT: * None * * RETURN: * None * **************************************************************************/ void encoder_reset (void) { /* External declarations for encoder variables which need to be reset */ /* Variables defined in levinson.c */ /* ------------------------------- */ extern Word16 old_A[M + 1]; /* Last A(z) for case of unstable filter */ /* Variables defined in q_gains.c */ /* ------------------------------- */ /* Memories of gain quantization: */ extern Word16 past_qua_en[4], pred[4]; /* Variables defined in q_plsf_5.c */ /* ------------------------------- */ /* Past quantized prediction error */ extern Word16 past_r2_q[M]; Word16 i; /* reset all the encoder state variables */ /* ------------------------------------- */ /* Variables in cod_12k2.c: */ Init_Coder_12k2 (); /* Variables in levinson.c: */ old_A[0] = 4096; /* Last A(z) for case of unstable filter */ for (i = 1; i < M + 1; i++) { old_A[i] = 0; } /* Variables in pre_proc.c: */ Init_Pre_Process (); /* Variables in q_gains.c: */ for (i = 0; i < 4; i++) { past_qua_en[i] = -2381; /* past quantized energies */ } pred[0] = 44; /* MA prediction coeff */ pred[1] = 37; /* MA prediction coeff */ pred[2] = 22; /* MA prediction coeff */ pred[3] = 12; /* MA prediction coeff */ /* Variables in q_plsf_5.c: */ for (i = 0; i < M; i++) { past_r2_q[i] = 0; /* Past quantized prediction error */ } return; } /*************************************************************************** * * FUNCTION NAME: reset_enc * * PURPOSE: * resets all of the state variables for the encoder and VAD, and for * the transmit DTX and Comfort Noise. * * INPUT: * None * * OUTPUT: * None * * RETURN: * None * **************************************************************************/ void reset_enc (void) { encoder_reset (); /* reset all the state variables in the speech encoder*/ vad_reset (); /* reset all the VAD state variables */ reset_tx_dtx (); /* reset all the transmit DTX and CN variables */ return; }