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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 e4ce7972737f
children
line wrap: on
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/*
 * This module holds const data tables of all supported DHFs:
 * 8 per-mode DHFs for AMR plus the different DHF for GSM-EFR.
 */

#include "tw_amr.h"

const int16_t amr_dhf_mr475[AMR_MAX_PRM] =
{
    0x00F8,
    0x009D,
    0x001C,
    0x0066,
    0x0000,
    0x0003,
    0x0028,
    0x000F,
    0x0038,
    0x0001,
    0x000F,
    0x0031,
    0x0002,
    0x0008,
    0x000F,
    0x0026,
    0x0003
};

const int16_t amr_dhf_mr515[AMR_MAX_PRM] =
{
    0x00F8,
    0x009D,
    0x001C,
    0x0066,
    0x0000,
    0x0003,
    0x0037,
    0x000F,
    0x0000,
    0x0003,
    0x0005,
    0x000F,
    0x0037,
    0x0003,
    0x0037,
    0x000F,
    0x0023,
    0x0003,
    0x001F
};

const int16_t amr_dhf_mr59[AMR_MAX_PRM] =
{
    0x00F8,
    0x00E3,
    0x002F,
    0x00BD,
    0x0000,
    0x0003,
    0x0037,
    0x000F,
    0x0001,
    0x0003,
    0x000F,
    0x0060,
    0x00F9,
    0x0003,
    0x0037,
    0x000F,
    0x0000,
    0x0003,
    0x0037
};

const int16_t amr_dhf_mr67[AMR_MAX_PRM] =
{
    0x00F8,
    0x00E3,
    0x002F,
    0x00BD,
    0x0002,
    0x0007,
    0x0000,
    0x000F,
    0x0098,
    0x0007,
    0x0061,
    0x0060,
    0x05C5,
    0x0007,
    0x0000,
    0x000F,
    0x0318,
    0x0007,
    0x0000
};

const int16_t amr_dhf_mr74[AMR_MAX_PRM] =
{
    0x00F8,
    0x00E3,
    0x002F,
    0x00BD,
    0x0006,
    0x000F,
    0x0000,
    0x001B,
    0x0208,
    0x000F,
    0x0062,
    0x0060,
    0x1BA6,
    0x000F,
    0x0000,
    0x001B,
    0x0006,
    0x000F,
    0x0000
};

const int16_t amr_dhf_mr795[AMR_MAX_PRM] =
{
    0x00C2,
    0x00E3,
    0x002F,
    0x00BD,
    0x0006,
    0x000F,
    0x000A,
    0x0000,
    0x0039,
    0x1C08,
    0x0007,
    0x000A,
    0x000B,
    0x0063,
    0x11A6,
    0x000F,
    0x0001,
    0x0000,
    0x0039,
    0x09A0,
    0x000F,
    0x0002,
    0x0001
};

const int16_t amr_dhf_mr102[AMR_MAX_PRM] =
{
    0x00F8,
    0x00E3,
    0x002F,
    0x0045,
    0x0000,
    0x0000,
    0x0000,
    0x0000,
    0x0000,
    0x0000,
    0x0000,
    0x0000,
    0x001B,
    0x0000,
    0x0001,
    0x0000,
    0x0001,
    0x0326,
    0x00CE,
    0x007E,
    0x0051,
    0x0062,
    0x0000,
    0x0000,
    0x0000,
    0x0000,
    0x015A,
    0x0359,
    0x0076,
    0x0000,
    0x001B,
    0x0000,
    0x0000,
    0x0000,
    0x0000,
    0x017C,
    0x0215,
    0x0038,
    0x0030
};

const int16_t amr_dhf_mr122[AMR_MAX_PRM] =
{
    0x0004,
    0x002A,
    0x00DB,
    0x0096,
    0x002A,
    0x0156,
    0x000B,
    0x0000,
    0x0000,
    0x0000,
    0x0000,
    0x0000,
    0x0000,
    0x0000,
    0x0000,
    0x0000,
    0x0000,
    0x0000,
    0x0036,
    0x000B,
    0x0000,
    0x000F,
    0x000E,
    0x000C,
    0x000D,
    0x0000,
    0x0001,
    0x0005,
    0x0007,
    0x0001,
    0x0008,
    0x0024,
    0x0000,
    0x0001,
    0x0000,
    0x0005,
    0x0006,
    0x0001,
    0x0002,
    0x0004,
    0x0007,
    0x0004,
    0x0002,
    0x0003,
    0x0036,
    0x000B,
    0x0000,
    0x0002,
    0x0004,
    0x0000,
    0x0003,
    0x0006,
    0x0001,
    0x0007,
    0x0006,
    0x0005,
    0x0000
};

const int16_t amr_dhf_gsmefr[AMR_MAX_PRM] =
{
        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 */
};