view libgsmhr1/sid_cw_params.c @ 574:993cb9273f89

libgsmhr1: add function that sets SID codeword at param level
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 13 Feb 2025 00:41:21 +0000
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/*
 * The function in this module fills parameters 4 through 17 of
 * generated SID frames, setting them to the required SID codeword.
 * It can also be used to transform a speech frame into a SID frame
 * with the same R0 and LPC parameters.
 */

#include <stdint.h>
#include "tw_gsmhr.h"

void gsmhr_set_sid_cw_params(int16_t *params)
{
	/* Int_LPC and Mode */
	params[4] = 1;
	params[5] = 3;
	/* subframe 1 */
	params[6] = 0xFF;
	params[7] = 0x1FF;
	params[8] = 0x1F;
	/* subframe 2 */
	params[9] = 0xF;
	params[10] = 0x1FF;
	params[11] = 0x1F;
	/* subframe 3 */
	params[12] = 0xF;
	params[13] = 0x1FF;
	params[14] = 0x1F;
	/* subframe 4 */
	params[15] = 0xF;
	params[16] = 0x1FF;
	params[17] = 0x1F;
}