gsm-codec-lib: libgsmefr/dtx.c annotate

author	Mychaela Falconia <falcon@freecalypso.org>
date	Sat, 26 Nov 2022 03:52:39 +0000
parents
children	58b64224d4ac

rev	line source
66 824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	1 /***************************************************************************
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	2 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	3 * File Name: dtx.c
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	4 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	5 * Purpose: Contains functions for performing DTX operation and comfort
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	6 * noise generation.
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	7 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	8 * Below is a listing of all the functions appearing in the file.
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	9 * The functions are arranged according to their purpose. Under
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	10 * each heading, the ordering is hierarchical.
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	11 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	12 * Resetting of static variables of TX DTX:
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	13 * reset_tx_dtx()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	14 * Resetting of static variables of RX DTX:
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	15 * reset_rx_dtx()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	16 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	17 * TX DTX handler (called by the speech encoder):
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	18 * tx_dtx()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	19 * RX DTX handler (called by the speech decoder):
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	20 * rx_dtx()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	21 * Encoding of comfort noise parameters into SID frame:
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	22 * CN_encoding()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	23 * Encoding of SID codeword into SID frame:
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	24 * sid_codeword_encoding()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	25 * Detecting of SID codeword from a frame:
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	26 * sid_frame_detection()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	27 * Update the LSF parameter history:
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	28 * update_lsf_history()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	29 * Update the reference LSF parameter vector:
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	30 * update_lsf_p_CN()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	31 * Compute the averaged LSF parameter vector:
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	32 * aver_lsf_history()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	33 * Update the fixed codebook gain parameter history of the encoder:
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	34 * update_gain_code_history_tx()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	35 * Update the fixed codebook gain parameter history of the decoder:
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	36 * update_gain_code_history_rx()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	37 * Compute the unquantized fixed codebook gain:
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	38 * compute_CN_excitation_gain()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	39 * Update the reference fixed codebook gain:
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	40 * update_gcode0_CN()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	41 * Compute the averaged fixed codebook gain:
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	42 * aver_gain_code_history()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	43 * Compute the comfort noise fixed codebook excitation:
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	44 * build_CN_code()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	45 * Generate a random integer value:
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	46 * pseudonoise()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	47 * Interpolate a comfort noise parameter value over the comfort noise
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	48 * update period:
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	49 * interpolate_CN_param()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	50 * Interpolate comfort noise LSF pparameter values over the comfort
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	51 * noise update period:
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	52 * interpolate_CN_lsf()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	53 * interpolate_CN_param()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	54 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	55 **************************************************************************/
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	56
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	57 #include "typedef.h"
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	58 #include "basic_op.h"
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	59 #include "cnst.h"
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	60 #include "sig_proc.h"
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	61 #include "count.h"
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	62 #include "dtx.h"
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	63
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	64 /* Inverse values of DTX hangover period and DTX hangover period + 1 */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	65
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	66 #define INV_DTX_HANGOVER (0x7fff / DTX_HANGOVER)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	67 #define INV_DTX_HANGOVER_P1 (0x7fff / (DTX_HANGOVER+1))
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	68
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	69 #define NB_PULSE 10 /* Number of pulses in fixed codebook excitation */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	70
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	71 /* SID frame classification thresholds */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	72
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	73 #define VALID_SID_THRESH 2
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	74 #define INVALID_SID_THRESH 16
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	75
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	76 /* Constant DTX_ELAPSED_THRESHOLD is used as threshold for allowing
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	77 SID frame updating without hangover period in case when elapsed
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	78 time measured from previous SID update is below 24 */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	79
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	80 #define DTX_ELAPSED_THRESHOLD (24 + DTX_HANGOVER - 1)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	81
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	82 /* Index map for encoding and detecting SID codeword */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	83
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	84 static const Word16 SID_codeword_bit_idx[95] =
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	85 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	86 45, 46, 48, 49, 50, 51, 52, 53, 54, 55,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	87 56, 57, 58, 59, 60, 61, 62, 63, 64, 65,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	88 66, 67, 68, 94, 95, 96, 98, 99, 100, 101,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	89 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	90 112, 113, 114, 115, 116, 117, 118, 148, 149, 150,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	91 151, 152, 153, 154, 155, 156, 157, 158, 159, 160,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	92 161, 162, 163, 164, 165, 166, 167, 168, 169, 170,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	93 171, 196, 197, 198, 199, 200, 201, 202, 203, 204,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	94 205, 206, 207, 208, 209, 212, 213, 214, 215, 216,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	95 217, 218, 219, 220, 221
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	96 };
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	97
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	98 Word16 txdtx_ctrl; /* Encoder DTX control word */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	99 Word16 rxdtx_ctrl; /* Decoder DTX control word */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	100 Word16 CN_excitation_gain; /* Unquantized fixed codebook gain */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	101 Word32 L_pn_seed_tx; /* PN generator seed (encoder) */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	102 Word32 L_pn_seed_rx; /* PN generator seed (decoder) */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	103 Word16 rx_dtx_state; /* State of comfort noise insertion period */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	104
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	105 static Word16 txdtx_hangover; /* Length of hangover period (VAD=0, SP=1) */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	106 static Word16 rxdtx_aver_period;/* Length of hangover period (VAD=0, SP=1) */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	107 static Word16 txdtx_N_elapsed; /* Measured time from previous SID frame */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	108 static Word16 rxdtx_N_elapsed; /* Measured time from previous SID frame */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	109 static Word16 old_CN_mem_tx[6]; /* The most recent CN parameters are stored*/
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	110 static Word16 prev_SID_frames_lost; /* Counter for lost SID frames */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	111 static Word16 buf_p_tx; /* Circular buffer pointer for gain code
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	112 history update in tx */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	113 static Word16 buf_p_rx; /* Circular buffer pointer for gain code
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	114 history update in rx */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	115
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	116 Word16 lsf_old_tx[DTX_HANGOVER][M]; /* Comfort noise LSF averaging buffer */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	117 Word16 lsf_old_rx[DTX_HANGOVER][M]; /* Comfort noise LSF averaging buffer */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	118
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	119 Word16 gain_code_old_tx[4 * DTX_HANGOVER]; /* Comfort noise gain averaging
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	120 buffer */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	121 Word16 gain_code_old_rx[4 * DTX_HANGOVER]; /* Comfort noise gain averaging
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	122 buffer */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	123
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	124 /*************************************************************************
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	125 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	126 * FUNCTION NAME: reset_tx_dtx
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	127 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	128 * PURPOSE: Resets the static variables of the TX DTX handler to their
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	129 * initial values
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	130 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	131 *************************************************************************/
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	132
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	133 void reset_tx_dtx ()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	134 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	135 Word16 i;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	136
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	137 /* suppose infinitely long speech period before start */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	138
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	139 txdtx_hangover = DTX_HANGOVER;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	140 txdtx_N_elapsed = 0x7fff;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	141 txdtx_ctrl = TX_SP_FLAG \| TX_VAD_FLAG;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	142
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	143 for (i = 0; i < 6; i++)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	144 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	145 old_CN_mem_tx[i] = 0;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	146 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	147
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	148 for (i = 0; i < DTX_HANGOVER; i++)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	149 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	150 lsf_old_tx[i][0] = 1384;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	151 lsf_old_tx[i][1] = 2077;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	152 lsf_old_tx[i][2] = 3420;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	153 lsf_old_tx[i][3] = 5108;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	154 lsf_old_tx[i][4] = 6742;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	155 lsf_old_tx[i][5] = 8122;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	156 lsf_old_tx[i][6] = 9863;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	157 lsf_old_tx[i][7] = 11092;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	158 lsf_old_tx[i][8] = 12714;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	159 lsf_old_tx[i][9] = 13701;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	160 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	161
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	162 for (i = 0; i < 4 * DTX_HANGOVER; i++)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	163 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	164 gain_code_old_tx[i] = 0;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	165 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	166
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	167 L_pn_seed_tx = PN_INITIAL_SEED;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	168
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	169 buf_p_tx = 0;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	170 return;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	171 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	172
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	173 /*************************************************************************
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	174 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	175 * FUNCTION NAME: reset_rx_dtx
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	176 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	177 * PURPOSE: Resets the static variables of the RX DTX handler to their
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	178 * initial values
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	179 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	180 *************************************************************************/
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	181
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	182 void reset_rx_dtx ()
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	183 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	184 Word16 i;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	185
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	186 /* suppose infinitely long speech period before start */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	187
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	188 rxdtx_aver_period = DTX_HANGOVER;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	189 rxdtx_N_elapsed = 0x7fff;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	190 rxdtx_ctrl = RX_SP_FLAG;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	191
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	192 for (i = 0; i < DTX_HANGOVER; i++)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	193 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	194 lsf_old_rx[i][0] = 1384;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	195 lsf_old_rx[i][1] = 2077;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	196 lsf_old_rx[i][2] = 3420;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	197 lsf_old_rx[i][3] = 5108;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	198 lsf_old_rx[i][4] = 6742;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	199 lsf_old_rx[i][5] = 8122;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	200 lsf_old_rx[i][6] = 9863;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	201 lsf_old_rx[i][7] = 11092;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	202 lsf_old_rx[i][8] = 12714;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	203 lsf_old_rx[i][9] = 13701;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	204 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	205
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	206 for (i = 0; i < 4 * DTX_HANGOVER; i++)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	207 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	208 gain_code_old_rx[i] = 0;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	209 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	210
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	211 L_pn_seed_rx = PN_INITIAL_SEED;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	212 rx_dtx_state = CN_INT_PERIOD - 1;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	213
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	214 prev_SID_frames_lost = 0;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	215 buf_p_rx = 0;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	216
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	217 return;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	218 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	219
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	220 /*************************************************************************
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	221 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	222 * FUNCTION NAME: tx_dtx
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	223 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	224 * PURPOSE: DTX handler of the speech encoder. Determines when to add
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	225 * the hangover period to the end of the speech burst, and
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	226 * also determines when to use old SID parameters, and when
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	227 * to update the SID parameters. This function also initializes
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	228 * the pseudo noise generator shift register.
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	229 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	230 * Operation of the TX DTX handler is based on the VAD flag
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	231 * given as input from the speech encoder.
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	232 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	233 * INPUTS: VAD_flag Voice activity decision
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	234 * *txdtx_ctrl Old encoder DTX control word
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	235 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	236 * OUTPUTS: *txdtx_ctrl Updated encoder DTX control word
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	237 * L_pn_seed_tx Initialized pseudo noise generator shift
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	238 * register (global variable)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	239 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	240 * RETURN VALUE: none
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	241 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	242 *************************************************************************/
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	243
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	244 void tx_dtx (
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	245 Word16 VAD_flag,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	246 Word16 *txdtx_ctrl
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	247 )
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	248 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	249
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	250 /* N_elapsed (frames since last SID update) is incremented. If SID
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	251 is updated N_elapsed is cleared later in this function */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	252
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	253 txdtx_N_elapsed = add (txdtx_N_elapsed, 1);
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	254
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	255 /* If voice activity was detected, reset hangover counter */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	256
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	257 test ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	258 if (sub (VAD_flag, 1) == 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	259 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	260 txdtx_hangover = DTX_HANGOVER; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	261 *txdtx_ctrl = TX_SP_FLAG \| TX_VAD_FLAG; move16 (); logic16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	262 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	263 else
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	264 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	265 test ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	266 if (txdtx_hangover == 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	267 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	268 /* Hangover period is over, SID should be updated */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	269
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	270 txdtx_N_elapsed = 0; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	271
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	272 /* Check if this is the first frame after hangover period */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	273 test (); logic16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	274 if ((*txdtx_ctrl & TX_HANGOVER_ACTIVE) != 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	275 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	276 *txdtx_ctrl = TX_PREV_HANGOVER_ACTIVE
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	277 \| TX_SID_UPDATE; move16 (); logic16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	278 L_pn_seed_tx = PN_INITIAL_SEED; move32 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	279 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	280 else
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	281 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	282 *txdtx_ctrl = TX_SID_UPDATE; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	283 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	284 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	285 else
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	286 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	287 /* Hangover period is not over, update hangover counter */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	288 txdtx_hangover = sub (txdtx_hangover, 1);
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	289
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	290 /* Check if elapsed time from last SID update is greater than
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	291 threshold. If not, set SP=0 (although hangover period is not
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	292 over) and use old SID parameters for new SID frame.
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	293 N_elapsed counter must be summed with hangover counter in order
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	294 to avoid erroneus SP=1 decision in case when N_elapsed is grown
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	295 bigger than threshold and hangover period is still active */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	296
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	297 test ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	298 if (sub (add (txdtx_N_elapsed, txdtx_hangover),
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	299 DTX_ELAPSED_THRESHOLD) < 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	300 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	301 /* old SID frame should be used */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	302 *txdtx_ctrl = TX_USE_OLD_SID; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	303 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	304 else
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	305 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	306 test (); logic16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	307 if ((*txdtx_ctrl & TX_HANGOVER_ACTIVE) != 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	308 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	309 *txdtx_ctrl = TX_PREV_HANGOVER_ACTIVE
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	310 \| TX_HANGOVER_ACTIVE
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	311 \| TX_SP_FLAG; move16 (); logic16 (); logic16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	312 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	313 else
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	314 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	315 *txdtx_ctrl = TX_HANGOVER_ACTIVE
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	316 \| TX_SP_FLAG; move16 (); logic16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	317 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	318 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	319 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	320 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	321
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	322 return;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	323 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	324
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	325 /*************************************************************************
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	326 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	327 * FUNCTION NAME: rx_dtx
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	328 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	329 * PURPOSE: DTX handler of the speech decoder. Determines when to update
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	330 * the reference comfort noise parameters (LSF and gain) at the
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	331 * end of the speech burst. Also classifies the incoming frames
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	332 * according to SID flag and BFI flag
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	333 * and determines when the transmission is active during comfort
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	334 * noise insertion. This function also initializes the pseudo
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	335 * noise generator shift register.
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	336 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	337 * Operation of the RX DTX handler is based on measuring the
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	338 * lengths of speech bursts and the lengths of the pauses between
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	339 * speech bursts to determine when there exists a hangover period
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	340 * at the end of a speech burst. The idea is to keep in sync with
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	341 * the TX DTX handler to be able to update the reference comfort
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	342 * noise parameters at the same time instances.
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	343 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	344 * INPUTS: *rxdtx_ctrl Old decoder DTX control word
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	345 * TAF Time alignment flag
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	346 * bfi Bad frame indicator flag
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	347 * SID_flag Silence descriptor flag
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	348 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	349 * OUTPUTS: *rxdtx_ctrl Updated decoder DTX control word
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	350 * rx_dtx_state Updated state of comfort noise interpolation
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	351 * period (global variable)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	352 * L_pn_seed_rx Initialized pseudo noise generator shift
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	353 * register (global variable)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	354 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	355 * RETURN VALUE: none
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	356 *
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	357 *************************************************************************/
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	358
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	359 void rx_dtx (
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	360 Word16 *rxdtx_ctrl,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	361 Word16 TAF,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	362 Word16 bfi,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	363 Word16 SID_flag
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	364 )
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	365 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	366 Word16 frame_type;
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	367
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	368 /* Frame classification according to bfi-flag and ternary-valued
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	369 SID flag. The frames between SID updates (not actually trans-
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	370 mitted) are also classified here; they will be discarded later
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	371 and provided with "NO TRANSMISSION"-flag */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	372
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	373 test (); test ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	374 test (); test ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	375 test (); test ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	376 if ((sub (SID_flag, 2) == 0) && (bfi == 0))
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	377 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	378 frame_type = VALID_SID_FRAME; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	379 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	380 else if ((SID_flag == 0) && (bfi == 0))
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	381 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	382 frame_type = GOOD_SPEECH_FRAME; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	383 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	384 else if ((SID_flag == 0) && (bfi != 0))
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	385 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	386 frame_type = UNUSABLE_FRAME; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	387 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	388 else
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	389 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	390 frame_type = INVALID_SID_FRAME; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	391 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	392
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	393 /* Update of decoder state */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	394 /* Previous frame was classified as a speech frame */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	395 test (); logic16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	396 if ((*rxdtx_ctrl & RX_SP_FLAG) != 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	397 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	398 test (); test (); test (); test ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	399 if (sub (frame_type, VALID_SID_FRAME) == 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	400 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	401 *rxdtx_ctrl = RX_FIRST_SID_UPDATE; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	402 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	403 else if (sub (frame_type, INVALID_SID_FRAME) == 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	404 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	405 *rxdtx_ctrl = RX_FIRST_SID_UPDATE
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	406 \| RX_INVALID_SID_FRAME; move16 (); logic16();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	407 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	408 else if (sub (frame_type, UNUSABLE_FRAME) == 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	409 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	410 *rxdtx_ctrl = RX_SP_FLAG; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	411 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	412 else if (sub (frame_type, GOOD_SPEECH_FRAME) == 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	413 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	414 *rxdtx_ctrl = RX_SP_FLAG; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	415 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	416 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	417 else
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	418 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	419 test (); test (); test (); test ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	420 if (sub (frame_type, VALID_SID_FRAME) == 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	421 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	422 *rxdtx_ctrl = RX_CONT_SID_UPDATE; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	423 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	424 else if (sub (frame_type, INVALID_SID_FRAME) == 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	425 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	426 *rxdtx_ctrl = RX_CONT_SID_UPDATE
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	427 \| RX_INVALID_SID_FRAME; move16 (); logic16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	428 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	429 else if (sub (frame_type, UNUSABLE_FRAME) == 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	430 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	431 *rxdtx_ctrl = RX_CNI_BFI; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	432 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	433 else if (sub (frame_type, GOOD_SPEECH_FRAME) == 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	434 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	435 /* If the previous frame (during CNI period) was muted,
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	436 raise the RX_PREV_DTX_MUTING flag */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	437 test (); logic16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	438 if ((*rxdtx_ctrl & RX_DTX_MUTING) != 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	439 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	440 *rxdtx_ctrl = RX_SP_FLAG \| RX_FIRST_SP_FLAG
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	441 \| RX_PREV_DTX_MUTING; move16 (); logic16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	442 logic16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	443 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	444 else
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	445 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	446 *rxdtx_ctrl = RX_SP_FLAG \| RX_FIRST_SP_FLAG; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	447 logic16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	448 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	449 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	450 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	451
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	452
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	453 test (); logic16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	454 if ((*rxdtx_ctrl & RX_SP_FLAG) != 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	455 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	456 prev_SID_frames_lost = 0; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	457 rx_dtx_state = CN_INT_PERIOD - 1; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	458 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	459 else
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	460 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	461 /* First SID frame */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	462 test (); logic16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	463 if ((*rxdtx_ctrl & RX_FIRST_SID_UPDATE) != 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	464 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	465 prev_SID_frames_lost = 0; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	466 rx_dtx_state = CN_INT_PERIOD - 1; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	467 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	468
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	469 /* SID frame detected, but not the first SID */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	470 test (); logic16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	471 if ((*rxdtx_ctrl & RX_CONT_SID_UPDATE) != 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	472 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	473 prev_SID_frames_lost = 0; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	474
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	475 test (); test ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	476 if (sub (frame_type, VALID_SID_FRAME) == 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	477 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	478 rx_dtx_state = 0; move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	479 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	480 else if (sub (frame_type, INVALID_SID_FRAME) == 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	481 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	482 test ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	483 if (sub(rx_dtx_state, (CN_INT_PERIOD - 1)) < 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	484 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	485 rx_dtx_state = add(rx_dtx_state, 1); move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	486 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	487 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	488 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	489
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	490 /* Bad frame received in CNI mode */
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	491 test (); logic16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	492 if ((*rxdtx_ctrl & RX_CNI_BFI) != 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	493 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	494 test ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	495 if (sub (rx_dtx_state, (CN_INT_PERIOD - 1)) < 0)
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	496 {
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	497 rx_dtx_state = add (rx_dtx_state, 1); move16 ();
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	498 }
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	499
824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code Mychaela Falconia <falcon@freecalypso.org> parents: diff changeset	500 /* If an unusable frame is received during CNI period

66

824ff833bda9 libgsmefr/dtx.c: initial import from ETSI code