view libtwamr/tseq_out.c @ 605:63f774192906

gsmhr_decoder_twts002_in(): set BFI=1 SID=1 for invalid SID When a received TW-TS-002 RTP payload indicates invalid SID, which of the 3 possible BFI/SID combinations should we pass to our internal ETSI-based speech decoder or TFO engine? Our original code passed BFI=0 SID=1, but upon further reflection, BFI=1 SID=1 is a better choice. In the corner case where received invalid SID is fed to a full decoder in homed state, setting BFI=1 allows that decoder to emit zeros on PCM and stay homed, instead of launching into full decoding.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 21:01:46 +0000
parents eced57698c03
children
line wrap: on
line source

/*
 * In this module we implement encoder output conversion to 3GPP
 * test sequence format.
 */

#include <stdint.h>
#include <string.h>
#include "tw_amr.h"
#include "namespace.h"
#include "typedef.h"
#include "cnst.h"
#include "prm2bits.h"

void amr_frame_to_tseq(const struct amr_param_frame *frame, uint16_t *cod)
{
	enum Mode pack_mode;

	cod[0] = frame->type;
	memset(cod + 1, 0, (AMR_COD_WORDS-1) * sizeof(uint16_t));
	switch (frame->type) {
	case TX_SPEECH_GOOD:
		pack_mode = frame->mode;
		cod[MAX_SERIAL_SIZE+1] = frame->mode;
		break;
	case TX_SID_FIRST:
	case TX_SID_UPDATE:
		pack_mode = MRDTX;
		cod[MAX_SERIAL_SIZE+1] = frame->mode;
		break;
	case TX_NO_DATA:
		pack_mode = MRDTX;
		cod[MAX_SERIAL_SIZE+1] = 0xFFFF;
		break;
	default:
		/* invalid usage, not allowed! */
		return;
	}
	Prm2bits(pack_mode, frame->param, (Word16 *)(cod + 1));
}