FreeCalypso > hg > freecalypso-tools
view tchtools/efr2dsp.c @ 993:84c9869a3659
flash PPB erase: make internal API more consistent
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 03 Dec 2023 04:58:50 +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; }