gsm_enco.c

柏林科技大学开发的gsm编码程序

/*
 * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
 * Universitaet Berlin.  See the accompanying file "COPYRIGHT" for
 * details.  THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
 */

/* $Header: /home/kbs/jutta/src/gsm/gsm-1.0/src/RCS/gsm_encode.c,v 1.1 1992/10/28 00:15:50 jutta Exp $ */

#include "private.h"
#include "gsm.h"
#include "proto.h"

void gsm_encode P3((s, source, c), gsm s, gsm_signal * source, gsm_byte * c)
{
	word	 	LARc[8], Nc[4], Mc[4], bc[4], xmaxc[4], xmc[13*4];
	int	i;

	Gsm_Coder(s, source, LARc, Nc, bc, Mc, xmaxc, xmc);

	/*	variable	size

		GSM_MAGIC	4

		LARc[0]		6
		LARc[1]		6
		LARc[2]		5
		LARc[3]		5
		LARc[4]		4
		LARc[5]		4
		LARc[6]		3
		LARc[7]		3

		Nc[0]		7
		bc[0]		2
		Mc[0]		2
		xmaxc[0]	6
		xmc[0]		3
		xmc[1]		3
		xmc[2]		3
		xmc[3]		3
		xmc[4]		3
		xmc[5]		3
		xmc[6]		3
		xmc[7]		3
		xmc[8]		3
		xmc[9]		3
		xmc[10]		3
		xmc[11]		3
		xmc[12]		3

		Nc[1]		7
		bc[1]		2
		Mc[1]		2
		xmaxc[1]	6
		xmc[13]		3
		xmc[14]		3
		xmc[15]		3
		xmc[16]		3
		xmc[17]		3
		xmc[18]		3
		xmc[19]		3
		xmc[20]		3
		xmc[21]		3
		xmc[22]		3
		xmc[23]		3
		xmc[24]		3
		xmc[25]		3

		Nc[2]		7
		bc[2]		2
		Mc[2]		2
		xmaxc[2]	6
		xmc[26]		3
		xmc[27]		3
		xmc[28]		3
		xmc[29]		3
		xmc[30]		3
		xmc[31]		3
		xmc[32]		3
		xmc[33]		3
		xmc[34]		3
		xmc[35]		3
		xmc[36]		3
		xmc[37]		3
		xmc[38]		3

		Nc[3]		7
		bc[3]		2
		Mc[3]		2
		xmaxc[3]	6
		xmc[39]		3
		xmc[40]		3
		xmc[41]		3
		xmc[42]		3
		xmc[43]		3
		xmc[44]		3
		xmc[45]		3
		xmc[46]		3
		xmc[47]		3
		xmc[48]		3
		xmc[49]		3
		xmc[50]		3
		xmc[51]		3
	*/


	*c++ =   ((GSM_MAGIC & 0xF) << 4)		/* 1 */
	       | ((LARc[0] >> 2) & 0xF);
	*c++ =   ((LARc[0] & 0x3) << 6)
	       | (LARc[1] & 0x3F);
	*c++ =   ((LARc[2] & 0x1F) << 3)
	       | ((LARc[3] >> 2) & 0x7);
	*c++ =   ((LARc[3] & 0x3) << 6)
	       | ((LARc[4] & 0xF) << 2)
	       | ((LARc[5] >> 2) & 0x3);
	*c++ =   ((LARc[5] & 0x3) << 6)
	       | ((LARc[6] & 0x7) << 3)
	       | (LARc[7] & 0x7);
	*c++ =   ((Nc[0] & 0x7F) << 1)
	       | ((bc[0] >> 1) & 0x1);
	*c++ =   ((bc[0] & 0x1) << 7)
	       | ((Mc[0] & 0x3) << 5)
	       | ((xmaxc[0] >> 1) & 0x1F);
	*c++ =   ((xmaxc[0] & 0x1) << 7)
	       | ((xmc[0] & 0x7) << 4)
	       | ((xmc[1] & 0x7) << 1)
	       | ((xmc[2] >> 2) & 0x1);
	*c++ =   ((xmc[2] & 0x3) << 6)
	       | ((xmc[3] & 0x7) << 3)
	       | (xmc[4] & 0x7);
	*c++ =   ((xmc[5] & 0x7) << 5)			/* 10 */
	       | ((xmc[6] & 0x7) << 2)
	       | ((xmc[7] >> 1) & 0x3);
	*c++ =   ((xmc[7] & 0x1) << 7)
	       | ((xmc[8] & 0x7) << 4)
	       | ((xmc[9] & 0x7) << 1)
	       | ((xmc[10] >> 2) & 0x1);
	*c++ =   ((xmc[10] & 0x3) << 6)
	       | ((xmc[11] & 0x7) << 3)
	       | (xmc[12] & 0x7);
	*c++ =   ((Nc[1] & 0x7F) << 1)
	       | ((bc[1] >> 1) & 0x1);
	*c++ =   ((bc[1] & 0x1) << 7)
	       | ((Mc[1] & 0x3) << 5)
	       | ((xmaxc[1] >> 1) & 0x1F);
	*c++ =   ((xmaxc[1] & 0x1) << 7)
	       | ((xmc[13] & 0x7) << 4)
	       | ((xmc[14] & 0x7) << 1)
	       | ((xmc[15] >> 2) & 0x1);
	*c++ =   ((xmc[15] & 0x3) << 6)
	       | ((xmc[16] & 0x7) << 3)
	       | (xmc[17] & 0x7);
	*c++ =   ((xmc[18] & 0x7) << 5)
	       | ((xmc[19] & 0x7) << 2)
	       | ((xmc[20] >> 1) & 0x3);
	*c++ =   ((xmc[20] & 0x1) << 7)
	       | ((xmc[21] & 0x7) << 4)
	       | ((xmc[22] & 0x7) << 1)
	       | ((xmc[23] >> 2) & 0x1);
	*c++ =   ((xmc[23] & 0x3) << 6)
	       | ((xmc[24] & 0x7) << 3)
	       | (xmc[25] & 0x7);
	*c++ =   ((Nc[2] & 0x7F) << 1)			/* 20 */
	       | ((bc[2] >> 1) & 0x1);
	*c++ =   ((bc[2] & 0x1) << 7)
	       | ((Mc[2] & 0x3) << 5)
	       | ((xmaxc[2] >> 1) & 0x1F);
	*c++ =   ((xmaxc[2] & 0x1) << 7)
	       | ((xmc[26] & 0x7) << 4)
	       | ((xmc[27] & 0x7) << 1)
	       | ((xmc[28] >> 2) & 0x1);
	*c++ =   ((xmc[28] & 0x3) << 6)
	       | ((xmc[29] & 0x7) << 3)
	       | (xmc[30] & 0x7);
	*c++ =   ((xmc[31] & 0x7) << 5)
	       | ((xmc[32] & 0x7) << 2)
	       | ((xmc[33] >> 1) & 0x3);
	*c++ =   ((xmc[33] & 0x1) << 7)
	       | ((xmc[34] & 0x7) << 4)
	       | ((xmc[35] & 0x7) << 1)
	       | ((xmc[36] >> 2) & 0x1);
	*c++ =   ((xmc[36] & 0x3) << 6)
	       | ((xmc[37] & 0x7) << 3)
	       | (xmc[38] & 0x7);
	*c++ =   ((Nc[3] & 0x7F) << 1)
	       | ((bc[3] >> 1) & 0x1);
	*c++ =   ((bc[3] & 0x1) << 7)
	       | ((Mc[3] & 0x3) << 5)
	       | ((xmaxc[3] >> 1) & 0x1F);
	*c++ =   ((xmaxc[3] & 0x1) << 7)
	       | ((xmc[39] & 0x7) << 4)
	       | ((xmc[40] & 0x7) << 1)
	       | ((xmc[41] >> 2) & 0x1);
	*c++ =   ((xmc[41] & 0x3) << 6)			/* 30 */
	       | ((xmc[42] & 0x7) << 3)
	       | (xmc[43] & 0x7);
	*c++ =   ((xmc[44] & 0x7) << 5)
	       | ((xmc[45] & 0x7) << 2)
	       | ((xmc[46] >> 1) & 0x3);
	*c++ =   ((xmc[46] & 0x1) << 7)
	       | ((xmc[47] & 0x7) << 4)
	       | ((xmc[48] & 0x7) << 1)
	       | ((xmc[49] >> 2) & 0x1);
	*c++ =   ((xmc[49] & 0x3) << 6)
	       | ((xmc[50] & 0x7) << 3)
	       | (xmc[51] & 0x7);
}