view dev/efr-bit-packing.c @ 477:4c9222d95647

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.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 18 May 2024 22:30:42 +0000
parents 9639a44ae2e7
children
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/*
 * We would like to generate our EFR RTP frame packing and unpacking code
 * using bitter and sweet utilities from libgsm, so we'll end up packing
 * and unpacking EFR just like good old FR.  However, because of our
 * slightly different approach, entering the spec file for bitter and sweet
 * manually would be tedious and error-prone, hence we are going to
 * generate it with this program.
 */

#include <stdio.h>
#include <stdlib.h>

#define	PRM_NO	57

/* table from ETSI EFR code */
static const unsigned bitno[PRM_NO] =
{
    7, 8, 9, 8, 6,                          /* LSP VQ          */
    9, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5,  /* first subframe  */
    6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5,  /* second subframe */
    9, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5,  /* third subframe  */
    6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 5   /* fourth subframe */
};

main(argc, argv)
	char **argv;
{
	unsigned n;

	printf("EFR_MAGIC\t4\n");
	for (n = 0; n < PRM_NO; n++)
		printf("params[%u]\t%u\n", n, bitno[n]);
	exit(0);
}