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fc-shell TCH DL handler: add support for CSD modes TCH DL capture mechanism in FC Tourmaline firmware has been extended to support CSD modes in addition to speech - add the necessary support on the host tools side. It needs to be noted that this mechanism in its present state does NOT provide the debug utility value that was sought: as we learned only after the code was implemented, TI's DSP has a misfeature in that the buffer we are reading (a_dd_0[]) is zeroed out when the IDS block is enabled, i.e., we are reading all zeros and not the real DL bits we were after. But since the code has already been written, we are keeping it - perhaps we can do some tests with IDS disabled.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 26 Nov 2024 06:27:43 +0000
parents 94890123a74f
children
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/*
 * The utility function implemented in this module constructs a 33-byte
 * frame for loading into Calypso DSP TCH UL buffer from a standard
 * 244-bit EFR codec frame in the RTP encoding format of ETSI TS 101 318.
 */

#include <sys/types.h>
#include <string.h>
#include <strings.h>

static const u_short efr_to_tidsp_table[244] = {
	 50,  24,  25,  37,  38,  43,  44,  26,  42,  27,  39,  40,
	 45,  51,  52,  41,  46,  28,  29,  47,  53,  77,  78,  30,
	 54,  55,  79,  56,  80, 109, 110, 111, 112, 113, 114, 115,
	180, 181,   0,   1,   2,   3,   4,   5,  20,  31,  32,  16,
	 73, 105, 157,  81, 118, 138, 165,  82, 119, 139, 166,  83,
	120, 140, 167,  84, 121, 141, 168,  85, 122, 186, 200, 204,
	224, 244, 205, 225, 245, 206, 226, 246, 207, 227, 247, 208,
	228, 248,  17,  61, 101, 153, 161,  12,  13,  22,  35,  48,
	116,  18,  74, 106, 158,  86, 123, 142, 169,  87, 124, 143,
	170,  88, 125, 144, 171,  89, 126, 145, 172,  90, 127, 189,
	201, 209, 229, 249, 210, 230, 250, 211, 231, 251, 212, 232,
	252, 213, 233, 253,  19,  62, 102, 154, 162,   6,   7,   8,
	  9,  10,  11,  21,  33,  34,  57,  75, 107, 159,  91, 128,
	146, 173,  92, 129, 147, 174,  93, 130, 148, 175,  94, 131,
	149, 176,  95, 132, 192, 202, 214, 234, 254, 215, 235, 255,
	216, 236, 256, 217, 237, 257, 218, 238, 258,  59,  63, 103,
	155, 163,  14,  15,  23,  36,  49, 117,  58,  76, 108, 160,
	 96, 133, 150, 177,  97, 134, 198, 199,  98, 135, 151, 178,
	 99, 136, 152, 179, 100, 137, 195, 203, 219, 239, 259, 220,
	240, 260, 221, 241, 261, 222, 242, 262, 223, 243, 263,  60,
	 64, 104, 156, 164
};

static int
msb_get_bit(buf, bn)
	u_char *buf;
{
	int pos_byte = bn >> 3;
	int pos_bit  = 7 - (bn & 7);

	return (buf[pos_byte] >> pos_bit) & 1;
}

static void
msb_set_bit(buf, bn)
	u_char *buf;
{
	int pos_byte = bn >> 3;
	int pos_bit  = 7 - (bn & 7);

	buf[pos_byte] |= (1 << pos_bit);
}

void
efr_std_to_tidsp(inbytes, outbytes)
	u_char *inbytes, *outbytes;
{
	int i;

	bzero(outbytes, 33);
	for (i = 0; i < 244; i++) {
		if (msb_get_bit(inbytes, i + 4))
			msb_set_bit(outbytes, efr_to_tidsp_table[i]);
	}
	/* set repetition bits */
	if (outbytes[23] & 0x20)
		outbytes[23] |= 0x18;
	if (outbytes[23] & 0x04)
		outbytes[23] |= 0x03;
	if (outbytes[24] & 0x80)
		outbytes[24] |= 0x60;
	if (outbytes[24] & 0x10)
		outbytes[24] |= 0x0C;
}