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+/*
+ ITU-T G.729A Annex B ANSI-C Source Code
+ Version 1.3 Last modified: August 1997
+ Copyright (c) 1996, France Telecom, Rockwell International,
+ Universite de Sherbrooke.
+ All rights reserved.
+*/
+
+/*--------------------------------------------------------------------------*
+ * Prototypes for DTX/CNG *
+ *--------------------------------------------------------------------------*/
+
+/* Encoder DTX/CNG functions */
+void Init_Cod_cng(void);
+void Cod_cng(
+ Word16 *exc, /* (i/o) : excitation array */
+ Word16 pastVad, /* (i) : previous VAD decision */
+ Word16 *lsp_old_q, /* (i/o) : previous quantized lsp */
+ Word16 *Aq, /* (o) : set of interpolated LPC coefficients */
+ Word16 *ana, /* (o) : coded SID parameters */
+ Word16 freq_prev[MA_NP][M],
+ /* (i/o) : previous LPS for quantization */
+ Word16 *seed /* (i/o) : random generator seed */
+);
+void Update_cng(
+ Word16 *r_h, /* (i) : MSB of frame autocorrelation */
+ Word16 exp_r, /* (i) : scaling factor associated */
+ Word16 Vad /* (i) : current Vad decision */
+);
+
+/* SID gain Quantization */
+void Qua_Sidgain(
+ Word16 *ener, /* (i) array of energies */
+ Word16 *sh_ener, /* (i) corresponding scaling factors */
+ Word16 nb_ener, /* (i) number of energies or */
+ Word16 *enerq, /* (o) decoded energies in dB */
+ Word16 *idx /* (o) SID gain quantization index */
+);
+
+/* CNG excitation generation */
+void Calc_exc_rand(
+ Word16 cur_gain, /* (i) : target sample gain */
+ Word16 *exc, /* (i/o) : excitation array */
+ Word16 *seed, /* (i) : current Vad decision */
+ Flag flag_cod /* (i) : encoder/decoder flag */
+);
+
+/* SID LSP Quantization */
+void Get_freq_prev(Word16 x[MA_NP][M]);
+void Update_freq_prev(Word16 x[MA_NP][M]);
+void Get_decfreq_prev(Word16 x[MA_NP][M]);
+void Update_decfreq_prev(Word16 x[MA_NP][M]);
+
+/* Decoder CNG generation */
+void Init_Dec_cng(void);
+void Dec_cng(
+ Word16 past_ftyp, /* (i) : past frame type */
+ Word16 sid_sav, /* (i) : energy to recover SID gain */
+ Word16 sh_sid_sav, /* (i) : corresponding scaling factor */
+ Word16 *parm, /* (i) : coded SID parameters */
+ Word16 *exc, /* (i/o) : excitation array */
+ Word16 *lsp_old, /* (i/o) : previous lsp */
+ Word16 *A_t, /* (o) : set of interpolated LPC coefficients */
+ Word16 *seed, /* (i/o) : random generator seed */
+ Word16 freq_prev[MA_NP][M]
+ /* (i/o) : previous LPS for quantization */
+);
+Word16 read_frame(FILE *f_serial, Word16 *parm);
+
+/*--------------------------------------------------------------------------*
+ * Constants for DTX/CNG *
+ *--------------------------------------------------------------------------*/
+
+/* DTX constants */
+#define FLAG_COD (Flag)1
+#define FLAG_DEC (Flag)0
+#define INIT_SEED 11111
+#define FR_SID_MIN 3
+#define NB_SUMACF 3
+#define NB_CURACF 2
+#define NB_GAIN 2
+#define FRAC_THRESH1 4855
+#define FRAC_THRESH2 3161
+#define A_GAIN0 28672
+
+#define SIZ_SUMACF (NB_SUMACF * MP1)
+#define SIZ_ACF (NB_CURACF * MP1)
+#define A_GAIN1 4096 /* 32768L - A_GAIN0 */
+
+#define RATE_8000 80 /* Full rate (8000 bit/s) */
+#define RATE_SID 15 /* SID */
+#define RATE_0 0 /* 0 bit/s rate */
+
+/* CNG excitation generation constant */
+ /* alpha = 0.5 */
+#define FRAC1 19043 /* (sqrt(40)xalpha/2 - 1) * 32768 */
+#define K0 24576 /* (1 - alpha ** 2) in Q15 */
+#define G_MAX 5000
+
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