toast_ulaw.c

GSM 6.10语音压缩算法

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0103,0103,0103,0103,0104,0104,0104,0104,0104,0104,0104,0104,0105,0105,0105,
0105,0105,0105,0105,0105,0106,0106,0106,0106,0106,0106,0106,0106,0107,0107,
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0111,0111,0111,0111,0111,0111,0111,0112,0112,0112,0112,0112,0112,0112,0112,
0113,0113,0113,0113,0113,0113,0113,0113,0114,0114,0114,0114,0114,0114,0114,
0114,0115,0115,0115,0115,0115,0115,0115,0115,0116,0116,0116,0116,0116,0116,
0116,0116,0117,0117,0117,0117,0117,0117,0117,0117,0120,0120,0120,0120,0121,
0121,0121,0121,0122,0122,0122,0122,0123,0123,0123,0123,0124,0124,0124,0124,
0125,0125,0125,0125,0126,0126,0126,0126,0127,0127,0127,0127,0130,0130,0130,
0130,0131,0131,0131,0131,0132,0132,0132,0132,0133,0133,0133,0133,0134,0134,
0134,0134,0135,0135,0135,0135,0136,0136,0136,0136,0137,0137,0137,0137,0140,
0140,0141,0141,0142,0142,0143,0143,0144,0144,0145,0145,0146,0146,0147,0147,
0150,0150,0150,0151,0151,0152,0152,0153,0153,0154,0154,0155,0155,0156,0156,
0157,0157,0160,0161,0162,0163,0164,0165,0166,0167,0170,0171,0172,0173,0174,
0175,0176
};

int ulaw_input P1((buf), gsm_signal * buf)
{
	int i, c;

	for (i = 0; i < 160 && (c = fgetc(in)) != EOF; i++) buf[i] = U2S(c);
	if (c == EOF && ferror(in)) return -1;
	return i;
}

int ulaw_output P1((buf), gsm_signal * buf)
{
	int i;

	for(i = 0; i < 160; i++, buf++)
		if (fputc( (char)S2U( (unsigned short)*buf ), out) == EOF)
			return -1;
	return 0;
}