FreeCalypso > hg > gsm-codec-lib
changeset 229:f00bf3687286
pcm16-to-ulaw: replace toast table with STL function
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sun, 23 Apr 2023 17:19:03 +0000 |
| parents | 67d60915fbbe |
| children | 20750ffb1c3e |
| files | miscutil/pcm16-to-ulaw.c |
| diffstat | 1 files changed, 51 insertions(+), 553 deletions(-) [+] |
line wrap: on
line diff
--- a/miscutil/pcm16-to-ulaw.c Sun Apr 23 17:07:51 2023 +0000 +++ b/miscutil/pcm16-to-ulaw.c Sun Apr 23 17:19:03 2023 +0000 @@ -1,8 +1,9 @@ /* * This program reads a 16-bit PCM recording in raw format (robe by default, * or LE with -l option) and converts it to 8-bit PCM in North American - * mu-law encoding. It is based on toast_ulaw.c from libgsm/toast package - * by Jutta Degener and Carsten Bormann, Technische Universitaet Berlin. + * mu-law encoding. It is based on the ulaw_compress() function from ITU-T + * G.191 STL, using the most significant 14 bits of each input linear PCM + * sample, rather than just 13. */ #include <stdio.h> @@ -11,557 +12,54 @@ #include <string.h> #include <strings.h> -#define S2U(x) (s2u[ ((unsigned short)(x)) >> 3 ]) +static unsigned +ulaw_compress(input) + unsigned input; +{ + short i; /* aux.var. */ + short absno; /* absolute value of linear (input) sample */ + short segno; /* segment (Table 2/G711, column 1) */ + short low_nibble; /* low nibble of log companded sample */ + short high_nibble; /* high nibble of log companded sample */ + unsigned output; + + /* -------------------------------------------------------------------- */ + /* Input is 14-bit right-justified in this version */ + /* Compute absolute value; adjust for easy processing */ + /* -------------------------------------------------------------------- */ + absno = input >= 0x2000 /* compute 1's complement in case of */ + ? (~input & 0x1FFF) + 33 /* negative samples */ + : input + 33; /* NB: 33 is the difference value */ + /* between the thresholds for */ + /* A-law and u-law. */ + if (absno > (0x1FFF)) /* limitation to "absno" < 8192 */ + absno = (0x1FFF); -static unsigned char s2u[] = { -0377,0376,0375,0374,0373,0372,0371,0370,0367,0366,0365,0364,0363,0362,0361, -0360,0357,0357,0356,0356,0355,0355,0354,0354,0353,0353,0352,0352,0351,0351, -0350,0350,0347,0347,0346,0346,0345,0345,0344,0344,0343,0343,0342,0342,0341, -0341,0340,0340,0337,0337,0337,0337,0336,0336,0336,0336,0335,0335,0335,0335, -0334,0334,0334,0334,0333,0333,0333,0333,0332,0332,0332,0332,0331,0331,0331, -0331,0330,0330,0330,0330,0327,0327,0327,0327,0326,0326,0326,0326,0325,0325, -0325,0325,0324,0324,0324,0324,0323,0323,0323,0323,0322,0322,0322,0322,0321, -0321,0321,0321,0320,0320,0320,0320,0317,0317,0317,0317,0317,0317,0317,0317, -0316,0316,0316,0316,0316,0316,0316,0316,0315,0315,0315,0315,0315,0315,0315, 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-0076,0077,0077,0077,0077,0077,0077,0077,0077,0077,0077,0077,0077,0077,0077, -0077,0077,0100,0100,0100,0100,0100,0100,0100,0100,0101,0101,0101,0101,0101, -0101,0101,0101,0102,0102,0102,0102,0102,0102,0102,0102,0103,0103,0103,0103, -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, -0107,0107,0107,0107,0107,0107,0110,0110,0110,0110,0110,0110,0110,0110,0111, -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 -}; + /* Determination of sample's segment */ + i = absno >> 6; + segno = 1; + while (i != 0) { + segno++; + i >>= 1; + } + + /* Mounting the high-nibble of the log-PCM sample */ + high_nibble = (0x0008) - segno; + + /* Mounting the low-nibble of the log PCM sample */ + low_nibble = (absno >> segno) /* right shift of mantissa and */ + &(0x000F); /* masking away leading '1' */ + low_nibble = (0x000F) - low_nibble; + + /* Joining the high-nibble and the low-nibble of the log PCM sample */ + output = (high_nibble << 4) | low_nibble; + + /* Add sign bit */ + if (input < 0x2000) + output = output | (0x0080); + + return output; +} main(argc, argv) char **argv; @@ -609,7 +107,7 @@ ins = ((uint16_t) inb[1] << 8) | ((uint16_t) inb[0]); else ins = ((uint16_t) inb[0] << 8) | ((uint16_t) inb[1]); - putc(S2U(ins), outf); + putc(ulaw_compress(ins >> 2), outf); } fclose(outf); exit(0);