diff options
Diffstat (limited to 'usr.sbin/i4b/dtmfdecode')
| -rw-r--r-- | usr.sbin/i4b/dtmfdecode/Makefile | 15 | ||||
| -rw-r--r-- | usr.sbin/i4b/dtmfdecode/dtmfdecode.1 | 64 | ||||
| -rw-r--r-- | usr.sbin/i4b/dtmfdecode/dtmfdecode.c | 150 |
3 files changed, 0 insertions, 229 deletions
diff --git a/usr.sbin/i4b/dtmfdecode/Makefile b/usr.sbin/i4b/dtmfdecode/Makefile deleted file mode 100644 index 792b2ef39301..000000000000 --- a/usr.sbin/i4b/dtmfdecode/Makefile +++ /dev/null @@ -1,15 +0,0 @@ -#--------------------------------------------------------------------------- -# -# $FreeBSD$ -# -# last edit-date: [Thu May 20 12:04:05 1999] -# -#--------------------------------------------------------------------------- - -PROG = dtmfdecode -SRC = dtmfdecode.c -#LDADD += -lm -CFLAGS += -Wall -g -DDEBUG -MAN1 = dtmfdecode.1 - -.include <bsd.prog.mk> diff --git a/usr.sbin/i4b/dtmfdecode/dtmfdecode.1 b/usr.sbin/i4b/dtmfdecode/dtmfdecode.1 deleted file mode 100644 index 42cd5beb7419..000000000000 --- a/usr.sbin/i4b/dtmfdecode/dtmfdecode.1 +++ /dev/null @@ -1,64 +0,0 @@ -.\" -.\" Copyright (c) 1999 Hellmuth Michaelis. All rights reserved. -.\" -.\" Redistribution and use in source and binary forms, with or without -.\" modification, are permitted provided that the following conditions -.\" are met: -.\" 1. Redistributions of source code must retain the above copyright -.\" notice, this list of conditions and the following disclaimer. -.\" 2. Redistributions in binary form must reproduce the above copyright -.\" notice, this list of conditions and the following disclaimer in the -.\" documentation and/or other materials provided with the distribution. -.\" -.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND -.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE -.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE -.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL -.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS -.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) -.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT -.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY -.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF -.\" SUCH DAMAGE. -.\" -.\" $FreeBSD$ -.\" -.\" last edit-date: [Mon Apr 26 13:42:15 1999] -.\" -.\" -.Dd February, 15 1999 -.Dt DTMFDECODE 1 -.Os -.Sh NAME -.Nm dtmfdecode -.Nd decodes DTMF tones from A-law audio data -.Sh SYNOPSIS -.Nm -.Sh DESCRIPTION -.Nm dtmfdecode -is part of the isdn4bsd package and is used to detect DTMF tones in the -audio stream. -.Pp -It reads audio G.711 A-Law coded data from stdin and outputs the detected -numbers values as ASCII charcters to stdout. -.Pp -The detector is implemented as 8 narrow band-pass filters realized with -an integer double-cross recursive algorithm. Various ad-hoc methods are -employed to provide hysteresis and anti-bounce for the detected signals. -.Sh EXAMPLES -The command: -.Bd -literal -offset indent -dtmfdecode < beep.al -.Ed -.Pp -will print a "1" to stdout. -.Sh STANDARDS -ITU Recommendations G.711 -.Sh AUTHORS -The -.Nm -utility was written by -.An Poul-Henning Kamp Aq phk@FreeBSD.org . -This man page was written by -.An Hellmuth Michaelis Aq hm@FreeBSD.org . diff --git a/usr.sbin/i4b/dtmfdecode/dtmfdecode.c b/usr.sbin/i4b/dtmfdecode/dtmfdecode.c deleted file mode 100644 index f96bacd42b10..000000000000 --- a/usr.sbin/i4b/dtmfdecode/dtmfdecode.c +++ /dev/null @@ -1,150 +0,0 @@ -/* - * ---------------------------------------------------------------------------- - * "THE BEER-WARE LICENSE" (Revision 42): - * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you - * can do whatever you want with this stuff. If we meet some day, and you think - * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp - * ---------------------------------------------------------------------------- - * - * $FreeBSD$ - * - * Extract DTMF signalling from ISDN4BSD A-law coded audio data - * - * A-Law to linear conversion from the sox package. - * - */ - -#include <stdio.h> -#include <math.h> - -/* Integer math scaling factor */ -#define FSC (1<<12) - -/* Alaw parameters */ -#define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */ -#define QUANT_MASK (0xf) /* Quantization field mask. */ -#define SEG_SHIFT (4) /* Left shift for segment number. */ -#define SEG_MASK (0x70) /* Segment field mask. */ - -static int -alaw2linear(a_val) - unsigned char a_val; -{ - int t; - int seg; - - a_val ^= 0x55; - - t = (a_val & QUANT_MASK) << 4; - seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT; - switch (seg) { - case 0: - t += 8; - break; - case 1: - t += 0x108; - break; - default: - t += 0x108; - t <<= seg - 1; - } - return ((a_val & SIGN_BIT) ? t : -t); -} - -#ifdef USE_COS -/* The frequencies we're trying to detect */ -static int dtmf[8] = {697, 770, 852, 941, 1209, 1336, 1477, 1633}; -#else -/* precalculated: p1[kk] = (-cos(2 * 3.141592 * dtmf[kk] / 8000.0) * FSC) */ -static int p1[8] = {-3497, -3369, -3212, -3027, -2384, -2040, -1635, -1164}; -#endif - -/* This is the Q of the filter (pole radius) */ -#define POLRAD .99 - -#define P2 ((int)(POLRAD*POLRAD*FSC)) - -int -main(int argc, char **argv) -{ - int i, kk, t, nn, s, so, ia; - int x, c, d, f, h[8], k[8], n, y[8]; -#ifdef USE_COS - int p1[8]; -#endif - int alaw[256]; - char key[256]; - - for (kk = 0; kk < 8; kk++) { - y[kk] = h[kk] = k[kk] = 0; -#ifdef USE_COS - p1[kk] = (-cos(2 * 3.141592 * dtmf[kk] / 8000.0) * FSC); -#endif - } - - for (i = 0; i < 256; i++) { - key[i] = '?'; - alaw[i] = alaw2linear(i) / (32768/FSC); - } - - /* We encode the tones in 8 bits, translate those to symbol */ - key[0x00] = '\0'; - - key[0x11] = '1'; key[0x12] = '4'; key[0x14] = '7'; key[0x18] = '*'; - key[0x21] = '2'; key[0x22] = '5'; key[0x24] = '8'; key[0x28] = '0'; - key[0x41] = '3'; key[0x42] = '6'; key[0x44] = '9'; key[0x48] = '#'; - key[0x81] = 'A'; key[0x82] = 'B'; key[0x84] = 'C'; key[0x88] = 'D'; - - nn = 0; - ia = 0; - so = 0; - t = 0; - while ((i = getchar()) != EOF) - { - t++; - - /* Convert to our format */ - x = alaw[i]; - - /* Input amplitude */ - if (x > 0) - ia += (x - ia) / 128; - else - ia += (-x - ia) / 128; - - /* For each tone */ - s = 0; - for(kk = 0; kk < 8; kk++) { - - /* Turn the crank */ - c = (P2 * (x - k[kk])) / FSC; - d = x + c; - f = (p1[kk] * (d - h[kk])) / FSC; - n = x - k[kk] - c; - k[kk] = h[kk] + f; - h[kk] = f + d; - - /* Detect and Average */ - if (n > 0) - y[kk] += (n - y[kk]) / 64; - else - y[kk] += (-n - y[kk]) / 64; - - /* Threshold */ - if (y[kk] > FSC/10 && y[kk] > ia) - s |= 1 << kk; - } - - /* Hysteresis and noise supressor */ - if (s != so) { -/* printf("x %d %x -> %x\n",t,so, s); */ - nn = 0; - so = s; - } else if (nn++ == 520 && key[s]) { - putchar(key[s]); -/* printf(" %d %x\n",t,s); */ - } - } - putchar('\n'); - return (0); -} |