libtwamr encoder: always emit frame->mode = mode; In the original implementation of amr_encode_frame(), the 'mode' member of the output struct was set to 0xFF if the output frame type is TX_NO_DATA. This design was made to mimic the mode field (16-bit word) being set to 0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends on this struct member being set in any way, and amr_frame_to_tseq() generates the needed 0xFFFF on its own, based on frame->type being equal to TX_NO_DATA. It is simpler and more efficient to always set frame->mode to the actual encoding mode in amr_encode_frame(), and this new behavior has already been documented in doc/AMR-library-API description in anticipation of the present change.

/*
 * In this module we implement allocation and initialization
 * of state structures for our GSM EFR encoder.
 */

#include <stdlib.h>
#include "gsm_efr.h"
#include "typedef.h"
#include "cnst.h"
#include "enc_state.h"

struct EFR_encoder_state *EFR_encoder_create(int dtx)
{
	struct EFR_encoder_state *st;

	st = malloc(sizeof(struct EFR_encoder_state));
	if (st)
		EFR_encoder_reset(st, dtx);
	return st;
}