FreeCalypso > hg > gsm-codec-lib
view libgsmefr/d_homing.c @ 581:e2d5cad04cbf
libgsmhr1 RxFE: store CN R0+LPC separately from speech
In the original GSM 06.06 code the ECU for speech mode is entirely
separate from the CN generator, maintaining separate state. (The
main intertie between them is the speech vs CN state variable,
distinguishing between speech and CN BFIs, in addition to the
CN-specific function of distinguishing between initial and update
SIDs.)
In the present RxFE implementation I initially thought that we could
use the same saved_frame buffer for both ECU and CN, overwriting
just the first 4 params (R0 and LPC) when a valid SID comes in.
However, I now realize it was a bad idea: the original code has a
corner case (long sequence of speech-mode BFIs to put the ECU in
state 6, then SID and CN-mode BFIs, then a good speech frame) that
would be broken by that buffer reuse approach. We could eliminate
this corner case by resetting the ECU state when passing through
a CN insertion period, but doing so would needlessly increase
the behavioral diffs between GSM 06.06 and our version.
Solution: use a separate CN-specific buffer for CN R0+LPC parameters,
and match the behavior of GSM 06.06 code in this regard.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Thu, 13 Feb 2025 10:02:45 +0000 |
| parents | eefef9f6d533 |
| children |
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/************************************************************************** * * File Name: d_homing.c * * Purpose: * This file contains the following functions: * * decoder_homing_frame_test() checks if a frame of input speech * parameters matches the Decoder Homing * Frame pattern. * * decoder_reset() called by reset_dec() to reset all of * the state variables for the decoder * * reset_dec() calls functions to reset the state * variables for the decoder, and for * the receive DTX and Comfort Noise. * **************************************************************************/ #include "gsm_efr.h" #include "typedef.h" #include "namespace.h" #include "cnst.h" #include "dtx.h" #include "codec.h" #include "memops.h" #include "dec_state.h" #include "d_homing.h" #include "q_plsf5_tab.h" #define PRM_NO 57 /*************************************************************************** * * FUNCTION NAME: decoder_homing_frame_test * * PURPOSE: * Checks if a frame of input speech parameters matches the Decoder * Homing Frame pattern, which is: * * parameter decimal value hexidecimal value * --------- ------------- ----------------- * LPC 1 4 0x0004 * LPC 2 47 0x002F * LPC 3 180 0x00B4 * LPC 4 144 0x0090 * LPC 5 62 0x003E * LTP-LAG 1 342 0x0156 * LTP-GAIN 1 11 0x000B * PULSE1_1 0 0x0000 * PULSE1_2 1 0x0001 * PULSE1_3 15 0x000F * PULSE1_4 1 0x0001 * PULSE1_5 13 0x000D * PULSE1_6 0 0x0000 * PULSE1_7 3 0x0003 * PULSE1_8 0 0x0000 * PULSE1_9 3 0x0003 * PULSE1_10 0 0x0000 * FCB-GAIN 1 3 0x0003 * LTP-LAG 2 54 0x0036 * LTP-GAIN 2 1 0x0001 * PULSE2_1 8 0x0008 * PULSE2_2 8 0x0008 * PULSE2_3 5 0x0005 * PULSE2_4 8 0x0008 * PULSE2_5 1 0x0001 * PULSE2_6 0 0x0000 * PULSE2_7 0 0x0000 * PULSE2_8 1 0x0001 * PULSE2_9 1 0x0001 * PULSE2_10 0 0x0000 * FCB-GAIN 2 0 0x0000 * LTP-LAG 3 342 0x0156 * LTP-GAIN 3 0 0x0000 * PULSE3_1 0 0x0000 * PULSE3_2 0 0x0000 * PULSE3_3 0 0x0000 * PULSE3_4 0 0x0000 * PULSE3_5 0 0x0000 * PULSE3_6 0 0x0000 * PULSE3_7 0 0x0000 * PULSE3_8 0 0x0000 * PULSE3_9 0 0x0000 * PULSE3_10 0 0x0000 * FCB-GAIN 3 0 0x0000 * LTP-LAG 4 54 0x0036 * LTP-GAIN 4 11 0x000B * PULSE4_1 0 0x0000 * PULSE4_2 0 0x0000 * PULSE4_3 0 0x0000 * PULSE4_4 0 0x0000 * PULSE4_5 0 0x0000 * PULSE4_6 0 0x0000 * PULSE4_7 0 0x0000 * PULSE4_8 0 0x0000 * PULSE4_9 0 0x0000 * PULSE4_10 0 0x0000 * FCB-GAIN 4 0 0x0000 * * INPUT: * parm[] one frame of speech parameters in parallel format * * nbr_of_params * the number of consecutive parameters in parm[] to match * * OUTPUT: * None * * RETURN: * 0 input frame does not match the Decoder Homing Frame pattern. * 1 input frame matches the Decoder Homing Frame pattern. * **************************************************************************/ Word16 decoder_homing_frame_test (const Word16 parm[], Word16 nbr_of_params) { static const Word16 dhf_mask[PRM_NO] = { 0x0004, /* LPC 1 */ 0x002f, /* LPC 2 */ 0x00b4, /* LPC 3 */ 0x0090, /* LPC 4 */ 0x003e, /* LPC 5 */ 0x0156, /* LTP-LAG 1 */ 0x000b, /* LTP-GAIN 1 */ 0x0000, /* PULSE 1_1 */ 0x0001, /* PULSE 1_2 */ 0x000f, /* PULSE 1_3 */ 0x0001, /* PULSE 1_4 */ 0x000d, /* PULSE 1_5 */ 0x0000, /* PULSE 1_6 */ 0x0003, /* PULSE 1_7 */ 0x0000, /* PULSE 1_8 */ 0x0003, /* PULSE 1_9 */ 0x0000, /* PULSE 1_10 */ 0x0003, /* FCB-GAIN 1 */ 0x0036, /* LTP-LAG 2 */ 0x0001, /* LTP-GAIN 2 */ 0x0008, /* PULSE 2_1 */ 0x0008, /* PULSE 2_2 */ 0x0005, /* PULSE 2_3 */ 0x0008, /* PULSE 2_4 */ 0x0001, /* PULSE 2_5 */ 0x0000, /* PULSE 2_6 */ 0x0000, /* PULSE 2_7 */ 0x0001, /* PULSE 2_8 */ 0x0001, /* PULSE 2_9 */ 0x0000, /* PULSE 2_10 */ 0x0000, /* FCB-GAIN 2 */ 0x0156, /* LTP-LAG 3 */ 0x0000, /* LTP-GAIN 3 */ 0x0000, /* PULSE 3_1 */ 0x0000, /* PULSE 3_2 */ 0x0000, /* PULSE 3_3 */ 0x0000, /* PULSE 3_4 */ 0x0000, /* PULSE 3_5 */ 0x0000, /* PULSE 3_6 */ 0x0000, /* PULSE 3_7 */ 0x0000, /* PULSE 3_8 */ 0x0000, /* PULSE 3_9 */ 0x0000, /* PULSE 3_10 */ 0x0000, /* FCB-GAIN 3 */ 0x0036, /* LTP-LAG 4 */ 0x000b, /* LTP-GAIN 4 */ 0x0000, /* PULSE 4_1 */ 0x0000, /* PULSE 4_2 */ 0x0000, /* PULSE 4_3 */ 0x0000, /* PULSE 4_4 */ 0x0000, /* PULSE 4_5 */ 0x0000, /* PULSE 4_6 */ 0x0000, /* PULSE 4_7 */ 0x0000, /* PULSE 4_8 */ 0x0000, /* PULSE 4_9 */ 0x0000, /* PULSE 4_10 */ 0x0000 /* FCB-GAIN 4 */ }; Word16 i, j; for (i = 0; i < nbr_of_params; i++) { j = parm[i] ^ dhf_mask[i]; if (j) break; } return !j; } /*************************************************************************** * * FUNCTION NAME: decoder_reset * * PURPOSE: * resets all of the state variables for the decoder * * INPUT: * None * * OUTPUT: * None * * RETURN: * None * **************************************************************************/ void decoder_reset (struct EFR_decoder_state *st) { Word16 i; /* reset all the decoder state variables */ /* ------------------------------------- */ /* Variable in decoder.c: */ Set_zero (st->synth_buf, M); /* Variables in dec_12k2.c: */ Init_Decoder_12k2 (st); /* Variable in agc.c: */ st->past_gain = 4096; /* Variables in d_gains.c: */ for (i = 0; i < 5; i++) { st->pbuf[i] = 410; /* Error concealment */ st->gbuf[i] = 1; /* Error concealment */ } st->past_gain_pit = 0; /* Error concealment */ st->prev_gp = 4096; /* Error concealment */ st->past_gain_code = 0; /* Error concealment */ st->prev_gc = 1; /* Error concealment */ st->gcode0_CN = 0; /* CNI */ st->gain_code_old_CN = 0; /* CNI */ st->gain_code_new_CN = 0; /* CNI */ st->gain_code_muting_CN = 0; /* CNI */ for (i = 0; i < 4; i++) { st->past_qua_en[i] = -2381; /* past quantized energies */ } st->pred[0] = 44; /* MA prediction coeff */ st->pred[1] = 37; /* MA prediction coeff */ st->pred[2] = 22; /* MA prediction coeff */ st->pred[3] = 12; /* MA prediction coeff */ /* Variables in d_plsf_5.c: */ for (i = 0; i < M; i++) { st->past_r2_q[i] = 0; /* Past quantized prediction error */ st->past_lsf_q[i] = mean_lsf[i]; /* Past dequantized lsfs */ st->lsf_p_CN[i] = mean_lsf[i]; /* CNI */ st->lsf_new_CN[i] = mean_lsf[i]; /* CNI */ st->lsf_old_CN[i] = mean_lsf[i]; /* CNI */ } /* Variable in dec_lag6.c: */ st->old_T0 = 40; /* Old integer lag */ /* Variable in preemph.c: */ st->mem_pre = 0; /* Filter memory */ /* Variables in pstfilt2.c: */ Init_Post_Filter (st); return; } /*************************************************************************** * * FUNCTION NAME: reset_dec * * PURPOSE: * resets all of the state variables for the decoder, and for the * receive DTX and Comfort Noise. * * INPUT: * None * * OUTPUT: * None * * RETURN: * None * **************************************************************************/ void EFR_decoder_reset (struct EFR_decoder_state *st) { st->reset_flag_old = 1; decoder_reset (st); /* reset all the state variables in the speech decoder*/ reset_rx_dtx (st); /* reset all the receive DTX and CN state variables */ /* Themyscira libgsmefr addition for no-data BFI handling */ st->L_pn_seed_nodata = PN_INITIAL_SEED; return; }