668 lines
20 KiB
C
668 lines
20 KiB
C
/* $Id$
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*
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* Linux ISDN subsystem, DTMF tone module
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*
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* Author Karsten Keil (kkeil@suse.de)
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*
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* based on I4L isdn_audio code
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* Copyright 2003 by Karsten Keil (kkeil@suse.de)
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* Copyright 1994-1999 by Fritz Elfert (fritz@isdn4linux.de)
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* DTMF code (c) 1996 by Christian Mock (cm@kukuruz.ping.at)
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* Silence detection (c) 1998 by Armin Schindler (mac@gismo.telekom.de)
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*
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* This software may be used and distributed according to the terms
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* of the GNU General Public License, incorporated herein by reference.
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*
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*/
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#include <linux/module.h>
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#include "core.h"
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#include "layer1.h"
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#include "helper.h"
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#include "debug.h"
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#define DTMF_NPOINTS 205 /* Number of samples for DTMF recognition */
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typedef struct _dtmf {
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struct list_head list;
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u_long Flags;
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int debug;
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char last;
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int idx;
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int buf[DTMF_NPOINTS];
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mISDNinstance_t inst;
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} dtmf_t;
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#define FLG_DTMF_ULAW 1
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#define FLG_DTMF_ACTIV 2
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static u_int debug = 0;
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#define DEBUG_DTMF_MGR 0x001
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#define DEBUG_DTMF_TONE 0x010
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#define DEBUG_DTMF_CTRL 0x020
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#define DEBUG_DTMF_DETECT 0x100
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#define DEBUG_DTMF_KOEFF 0x200
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static mISDNobject_t dtmf_obj;
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static char *mISDN_dtmf_revision = "$Revision$";
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/*
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* Misc. lookup-tables.
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*/
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/* ulaw -> signed 16-bit */
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static short isdn_audio_ulaw_to_s16[] =
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{
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0x8284, 0x8684, 0x8a84, 0x8e84, 0x9284, 0x9684, 0x9a84, 0x9e84,
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0xa284, 0xa684, 0xaa84, 0xae84, 0xb284, 0xb684, 0xba84, 0xbe84,
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0xc184, 0xc384, 0xc584, 0xc784, 0xc984, 0xcb84, 0xcd84, 0xcf84,
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0xd184, 0xd384, 0xd584, 0xd784, 0xd984, 0xdb84, 0xdd84, 0xdf84,
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0xe104, 0xe204, 0xe304, 0xe404, 0xe504, 0xe604, 0xe704, 0xe804,
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0xe904, 0xea04, 0xeb04, 0xec04, 0xed04, 0xee04, 0xef04, 0xf004,
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0xf0c4, 0xf144, 0xf1c4, 0xf244, 0xf2c4, 0xf344, 0xf3c4, 0xf444,
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0xf4c4, 0xf544, 0xf5c4, 0xf644, 0xf6c4, 0xf744, 0xf7c4, 0xf844,
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0xf8a4, 0xf8e4, 0xf924, 0xf964, 0xf9a4, 0xf9e4, 0xfa24, 0xfa64,
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0xfaa4, 0xfae4, 0xfb24, 0xfb64, 0xfba4, 0xfbe4, 0xfc24, 0xfc64,
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0xfc94, 0xfcb4, 0xfcd4, 0xfcf4, 0xfd14, 0xfd34, 0xfd54, 0xfd74,
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0xfd94, 0xfdb4, 0xfdd4, 0xfdf4, 0xfe14, 0xfe34, 0xfe54, 0xfe74,
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0xfe8c, 0xfe9c, 0xfeac, 0xfebc, 0xfecc, 0xfedc, 0xfeec, 0xfefc,
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0xff0c, 0xff1c, 0xff2c, 0xff3c, 0xff4c, 0xff5c, 0xff6c, 0xff7c,
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0xff88, 0xff90, 0xff98, 0xffa0, 0xffa8, 0xffb0, 0xffb8, 0xffc0,
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0xffc8, 0xffd0, 0xffd8, 0xffe0, 0xffe8, 0xfff0, 0xfff8, 0x0000,
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0x7d7c, 0x797c, 0x757c, 0x717c, 0x6d7c, 0x697c, 0x657c, 0x617c,
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0x5d7c, 0x597c, 0x557c, 0x517c, 0x4d7c, 0x497c, 0x457c, 0x417c,
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0x3e7c, 0x3c7c, 0x3a7c, 0x387c, 0x367c, 0x347c, 0x327c, 0x307c,
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0x2e7c, 0x2c7c, 0x2a7c, 0x287c, 0x267c, 0x247c, 0x227c, 0x207c,
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0x1efc, 0x1dfc, 0x1cfc, 0x1bfc, 0x1afc, 0x19fc, 0x18fc, 0x17fc,
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0x16fc, 0x15fc, 0x14fc, 0x13fc, 0x12fc, 0x11fc, 0x10fc, 0x0ffc,
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0x0f3c, 0x0ebc, 0x0e3c, 0x0dbc, 0x0d3c, 0x0cbc, 0x0c3c, 0x0bbc,
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0x0b3c, 0x0abc, 0x0a3c, 0x09bc, 0x093c, 0x08bc, 0x083c, 0x07bc,
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0x075c, 0x071c, 0x06dc, 0x069c, 0x065c, 0x061c, 0x05dc, 0x059c,
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0x055c, 0x051c, 0x04dc, 0x049c, 0x045c, 0x041c, 0x03dc, 0x039c,
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0x036c, 0x034c, 0x032c, 0x030c, 0x02ec, 0x02cc, 0x02ac, 0x028c,
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0x026c, 0x024c, 0x022c, 0x020c, 0x01ec, 0x01cc, 0x01ac, 0x018c,
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0x0174, 0x0164, 0x0154, 0x0144, 0x0134, 0x0124, 0x0114, 0x0104,
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0x00f4, 0x00e4, 0x00d4, 0x00c4, 0x00b4, 0x00a4, 0x0094, 0x0084,
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0x0078, 0x0070, 0x0068, 0x0060, 0x0058, 0x0050, 0x0048, 0x0040,
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0x0038, 0x0030, 0x0028, 0x0020, 0x0018, 0x0010, 0x0008, 0x0000
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};
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/* alaw -> signed 16-bit */
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static short isdn_audio_alaw_to_s16[] =
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{
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0x13fc, 0xec04, 0x0144, 0xfebc, 0x517c, 0xae84, 0x051c, 0xfae4,
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0x0a3c, 0xf5c4, 0x0048, 0xffb8, 0x287c, 0xd784, 0x028c, 0xfd74,
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0x1bfc, 0xe404, 0x01cc, 0xfe34, 0x717c, 0x8e84, 0x071c, 0xf8e4,
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0x0e3c, 0xf1c4, 0x00c4, 0xff3c, 0x387c, 0xc784, 0x039c, 0xfc64,
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0x0ffc, 0xf004, 0x0104, 0xfefc, 0x417c, 0xbe84, 0x041c, 0xfbe4,
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0x083c, 0xf7c4, 0x0008, 0xfff8, 0x207c, 0xdf84, 0x020c, 0xfdf4,
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0x17fc, 0xe804, 0x018c, 0xfe74, 0x617c, 0x9e84, 0x061c, 0xf9e4,
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0x0c3c, 0xf3c4, 0x0084, 0xff7c, 0x307c, 0xcf84, 0x030c, 0xfcf4,
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0x15fc, 0xea04, 0x0164, 0xfe9c, 0x597c, 0xa684, 0x059c, 0xfa64,
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0x0b3c, 0xf4c4, 0x0068, 0xff98, 0x2c7c, 0xd384, 0x02cc, 0xfd34,
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0x1dfc, 0xe204, 0x01ec, 0xfe14, 0x797c, 0x8684, 0x07bc, 0xf844,
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0x0f3c, 0xf0c4, 0x00e4, 0xff1c, 0x3c7c, 0xc384, 0x03dc, 0xfc24,
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0x11fc, 0xee04, 0x0124, 0xfedc, 0x497c, 0xb684, 0x049c, 0xfb64,
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0x093c, 0xf6c4, 0x0028, 0xffd8, 0x247c, 0xdb84, 0x024c, 0xfdb4,
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0x19fc, 0xe604, 0x01ac, 0xfe54, 0x697c, 0x9684, 0x069c, 0xf964,
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0x0d3c, 0xf2c4, 0x00a4, 0xff5c, 0x347c, 0xcb84, 0x034c, 0xfcb4,
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0x12fc, 0xed04, 0x0134, 0xfecc, 0x4d7c, 0xb284, 0x04dc, 0xfb24,
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0x09bc, 0xf644, 0x0038, 0xffc8, 0x267c, 0xd984, 0x026c, 0xfd94,
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0x1afc, 0xe504, 0x01ac, 0xfe54, 0x6d7c, 0x9284, 0x06dc, 0xf924,
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0x0dbc, 0xf244, 0x00b4, 0xff4c, 0x367c, 0xc984, 0x036c, 0xfc94,
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0x0f3c, 0xf0c4, 0x00f4, 0xff0c, 0x3e7c, 0xc184, 0x03dc, 0xfc24,
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0x07bc, 0xf844, 0x0008, 0xfff8, 0x1efc, 0xe104, 0x01ec, 0xfe14,
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0x16fc, 0xe904, 0x0174, 0xfe8c, 0x5d7c, 0xa284, 0x05dc, 0xfa24,
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0x0bbc, 0xf444, 0x0078, 0xff88, 0x2e7c, 0xd184, 0x02ec, 0xfd14,
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0x14fc, 0xeb04, 0x0154, 0xfeac, 0x557c, 0xaa84, 0x055c, 0xfaa4,
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0x0abc, 0xf544, 0x0058, 0xffa8, 0x2a7c, 0xd584, 0x02ac, 0xfd54,
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0x1cfc, 0xe304, 0x01cc, 0xfe34, 0x757c, 0x8a84, 0x075c, 0xf8a4,
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0x0ebc, 0xf144, 0x00d4, 0xff2c, 0x3a7c, 0xc584, 0x039c, 0xfc64,
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0x10fc, 0xef04, 0x0114, 0xfeec, 0x457c, 0xba84, 0x045c, 0xfba4,
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0x08bc, 0xf744, 0x0018, 0xffe8, 0x227c, 0xdd84, 0x022c, 0xfdd4,
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0x18fc, 0xe704, 0x018c, 0xfe74, 0x657c, 0x9a84, 0x065c, 0xf9a4,
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0x0cbc, 0xf344, 0x0094, 0xff6c, 0x327c, 0xcd84, 0x032c, 0xfcd4
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};
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/* alaw -> ulaw */
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static char isdn_audio_alaw_to_ulaw[] =
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{
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0xab, 0x2b, 0xe3, 0x63, 0x8b, 0x0b, 0xc9, 0x49,
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0xba, 0x3a, 0xf6, 0x76, 0x9b, 0x1b, 0xd7, 0x57,
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0xa3, 0x23, 0xdd, 0x5d, 0x83, 0x03, 0xc1, 0x41,
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0xb2, 0x32, 0xeb, 0x6b, 0x93, 0x13, 0xcf, 0x4f,
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0xaf, 0x2f, 0xe7, 0x67, 0x8f, 0x0f, 0xcd, 0x4d,
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0xbe, 0x3e, 0xfe, 0x7e, 0x9f, 0x1f, 0xdb, 0x5b,
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0xa7, 0x27, 0xdf, 0x5f, 0x87, 0x07, 0xc5, 0x45,
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0xb6, 0x36, 0xef, 0x6f, 0x97, 0x17, 0xd3, 0x53,
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0xa9, 0x29, 0xe1, 0x61, 0x89, 0x09, 0xc7, 0x47,
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0xb8, 0x38, 0xf2, 0x72, 0x99, 0x19, 0xd5, 0x55,
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0xa1, 0x21, 0xdc, 0x5c, 0x81, 0x01, 0xbf, 0x3f,
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0xb0, 0x30, 0xe9, 0x69, 0x91, 0x11, 0xce, 0x4e,
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0xad, 0x2d, 0xe5, 0x65, 0x8d, 0x0d, 0xcb, 0x4b,
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0xbc, 0x3c, 0xfa, 0x7a, 0x9d, 0x1d, 0xd9, 0x59,
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0xa5, 0x25, 0xde, 0x5e, 0x85, 0x05, 0xc3, 0x43,
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0xb4, 0x34, 0xed, 0x6d, 0x95, 0x15, 0xd1, 0x51,
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0xac, 0x2c, 0xe4, 0x64, 0x8c, 0x0c, 0xca, 0x4a,
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0xbb, 0x3b, 0xf8, 0x78, 0x9c, 0x1c, 0xd8, 0x58,
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0xa4, 0x24, 0xde, 0x5e, 0x84, 0x04, 0xc2, 0x42,
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0xb3, 0x33, 0xec, 0x6c, 0x94, 0x14, 0xd0, 0x50,
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0xb0, 0x30, 0xe8, 0x68, 0x90, 0x10, 0xce, 0x4e,
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0xbf, 0x3f, 0xfe, 0x7e, 0xa0, 0x20, 0xdc, 0x5c,
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0xa8, 0x28, 0xe0, 0x60, 0x88, 0x08, 0xc6, 0x46,
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0xb7, 0x37, 0xf0, 0x70, 0x98, 0x18, 0xd4, 0x54,
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0xaa, 0x2a, 0xe2, 0x62, 0x8a, 0x0a, 0xc8, 0x48,
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0xb9, 0x39, 0xf4, 0x74, 0x9a, 0x1a, 0xd6, 0x56,
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0xa2, 0x22, 0xdd, 0x5d, 0x82, 0x02, 0xc0, 0x40,
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0xb1, 0x31, 0xea, 0x6a, 0x92, 0x12, 0xcf, 0x4f,
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0xae, 0x2e, 0xe6, 0x66, 0x8e, 0x0e, 0xcc, 0x4c,
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0xbd, 0x3d, 0xfc, 0x7c, 0x9e, 0x1e, 0xda, 0x5a,
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0xa6, 0x26, 0xdf, 0x5f, 0x86, 0x06, 0xc4, 0x44,
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0xb5, 0x35, 0xee, 0x6e, 0x96, 0x16, 0xd2, 0x52
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};
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/* ulaw -> alaw */
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static char isdn_audio_ulaw_to_alaw[] =
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{
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0xab, 0x55, 0xd5, 0x15, 0x95, 0x75, 0xf5, 0x35,
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0xb5, 0x45, 0xc5, 0x05, 0x85, 0x65, 0xe5, 0x25,
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0xa5, 0x5d, 0xdd, 0x1d, 0x9d, 0x7d, 0xfd, 0x3d,
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0xbd, 0x4d, 0xcd, 0x0d, 0x8d, 0x6d, 0xed, 0x2d,
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0xad, 0x51, 0xd1, 0x11, 0x91, 0x71, 0xf1, 0x31,
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0xb1, 0x41, 0xc1, 0x01, 0x81, 0x61, 0xe1, 0x21,
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0x59, 0xd9, 0x19, 0x99, 0x79, 0xf9, 0x39, 0xb9,
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0x49, 0xc9, 0x09, 0x89, 0x69, 0xe9, 0x29, 0xa9,
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0xd7, 0x17, 0x97, 0x77, 0xf7, 0x37, 0xb7, 0x47,
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0xc7, 0x07, 0x87, 0x67, 0xe7, 0x27, 0xa7, 0xdf,
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0x9f, 0x7f, 0xff, 0x3f, 0xbf, 0x4f, 0xcf, 0x0f,
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0x8f, 0x6f, 0xef, 0x2f, 0x53, 0x13, 0x73, 0x33,
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0xb3, 0x43, 0xc3, 0x03, 0x83, 0x63, 0xe3, 0x23,
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0xa3, 0x5b, 0xdb, 0x1b, 0x9b, 0x7b, 0xfb, 0x3b,
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0xbb, 0xbb, 0x4b, 0x4b, 0xcb, 0xcb, 0x0b, 0x0b,
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0x8b, 0x8b, 0x6b, 0x6b, 0xeb, 0xeb, 0x2b, 0x2b,
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0xab, 0x54, 0xd4, 0x14, 0x94, 0x74, 0xf4, 0x34,
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0xb4, 0x44, 0xc4, 0x04, 0x84, 0x64, 0xe4, 0x24,
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0xa4, 0x5c, 0xdc, 0x1c, 0x9c, 0x7c, 0xfc, 0x3c,
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0xbc, 0x4c, 0xcc, 0x0c, 0x8c, 0x6c, 0xec, 0x2c,
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0xac, 0x50, 0xd0, 0x10, 0x90, 0x70, 0xf0, 0x30,
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0xb0, 0x40, 0xc0, 0x00, 0x80, 0x60, 0xe0, 0x20,
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0x58, 0xd8, 0x18, 0x98, 0x78, 0xf8, 0x38, 0xb8,
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0x48, 0xc8, 0x08, 0x88, 0x68, 0xe8, 0x28, 0xa8,
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0xd6, 0x16, 0x96, 0x76, 0xf6, 0x36, 0xb6, 0x46,
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0xc6, 0x06, 0x86, 0x66, 0xe6, 0x26, 0xa6, 0xde,
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0x9e, 0x7e, 0xfe, 0x3e, 0xbe, 0x4e, 0xce, 0x0e,
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0x8e, 0x6e, 0xee, 0x2e, 0x52, 0x12, 0x72, 0x32,
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0xb2, 0x42, 0xc2, 0x02, 0x82, 0x62, 0xe2, 0x22,
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0xa2, 0x5a, 0xda, 0x1a, 0x9a, 0x7a, 0xfa, 0x3a,
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0xba, 0xba, 0x4a, 0x4a, 0xca, 0xca, 0x0a, 0x0a,
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0x8a, 0x8a, 0x6a, 0x6a, 0xea, 0xea, 0x2a, 0x2a
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};
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#define NCOEFF 8 /* number of frequencies to be analyzed */
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#define DTMF_TRESH 4000 /* above this is dtmf */
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#define SILENCE_TRESH 200 /* below this is silence */
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#define AMP_BITS 9 /* bits per sample, reduced to avoid overflow */
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#define LOGRP 0
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#define HIGRP 1
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/* For DTMF recognition:
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* 2 * cos(2 * PI * k / N) precalculated for all k
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*/
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static int cos2pik[NCOEFF] =
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{
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55813, 53604, 51193, 48591, 38114, 33057, 25889, 18332
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};
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static char dtmf_matrix[4][4] =
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{
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{'1', '2', '3', 'A'},
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{'4', '5', '6', 'B'},
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{'7', '8', '9', 'C'},
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{'*', '0', '#', 'D'}
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};
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static inline void
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isdn_audio_tlookup(const u_char *table, u_char *buff, unsigned long n)
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{
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#ifdef __i386__
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unsigned long d0, d1, d2, d3;
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__asm__ __volatile__(
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"cld\n"
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"1:\tlodsb\n\t"
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"xlatb\n\t"
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"stosb\n\t"
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"loop 1b\n\t"
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: "=&b"(d0), "=&c"(d1), "=&D"(d2), "=&S"(d3)
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: "0"((long) table), "1"(n), "2"((long) buff), "3"((long) buff)
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: "memory", "ax");
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#else
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while (n--)
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*buff = table[*(unsigned char *)buff], buff++;
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#endif
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}
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void
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isdn_audio_ulaw2alaw(unsigned char *buff, unsigned long len)
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{
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isdn_audio_tlookup(isdn_audio_ulaw_to_alaw, buff, len);
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}
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void
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isdn_audio_alaw2ulaw(unsigned char *buff, unsigned long len)
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{
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isdn_audio_tlookup(isdn_audio_alaw_to_ulaw, buff, len);
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}
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/*
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* Goertzel algorithm.
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* See http://ptolemy.eecs.berkeley.edu/~pino/Ptolemy/papers/96/dtmf_ict/
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* for more info.
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*/
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static void
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isdn_audio_goertzel(dtmf_t *dtmf)
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{
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int sk[NCOEFF], sk1[NCOEFF], sk2[NCOEFF];
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register int sample;
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int k, n;
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int thresh, silence;
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int lgrp,hgrp;
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char what;
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memset(sk, 0, NCOEFF*sizeof(int));
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memset(sk1, 0, NCOEFF*sizeof(int));
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memset(sk2, 0, NCOEFF*sizeof(int));
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for (n = 0; n < DTMF_NPOINTS; n++) {
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sample = dtmf->buf[n];
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for (k = 0; k < NCOEFF; k++)
|
|
sk[k] = sample + ((cos2pik[k] * sk1[k]) >> 15) - sk2[k];
|
|
memcpy(sk2, sk1, NCOEFF*sizeof(int));
|
|
memcpy(sk1, sk, NCOEFF*sizeof(int));
|
|
}
|
|
thresh = silence = 0;
|
|
lgrp = hgrp = -1;
|
|
for (k = 0; k < NCOEFF; k++) {
|
|
sk[k] >>= 1;
|
|
sk2[k] >>= 1;
|
|
/* compute |X(k)|**2 */
|
|
/* report overflows. This should not happen. */
|
|
/* Comment this out if desired */
|
|
if (sk[k] < -32768 || sk[k] > 32767)
|
|
printk(KERN_DEBUG
|
|
"dtmf goertzel overflow, sk[%d]=%d\n", k, sk[k]);
|
|
if (sk2[k] < -32768 || sk2[k] > 32767)
|
|
printk(KERN_DEBUG
|
|
"isdn_audio: dtmf goertzel overflow, sk2[%d]=%d\n", k, sk2[k]);
|
|
sk1[k] = ((sk[k] * sk[k]) >> AMP_BITS) -
|
|
((((cos2pik[k] * sk[k]) >> 15) * sk2[k]) >> AMP_BITS) +
|
|
((sk2[k] * sk2[k]) >> AMP_BITS);
|
|
if (sk1[k] > DTMF_TRESH) {
|
|
if (sk1[k] > thresh)
|
|
thresh = sk1[k];
|
|
} else if (sk1[k] < SILENCE_TRESH)
|
|
silence++;
|
|
}
|
|
if (dtmf->debug & DEBUG_DTMF_KOEFF)
|
|
printk(KERN_DEBUG "DTMF koeff(%d,%d,%d,%d,%d,%d,%d,%d) range(%d-%d)\n",
|
|
sk1[0], sk1[1], sk1[2], sk1[3], sk1[4], sk1[5],
|
|
sk1[6], sk1[7], SILENCE_TRESH, DTMF_TRESH);
|
|
if (silence == NCOEFF)
|
|
what = ' ';
|
|
else {
|
|
if (thresh > 0) {
|
|
thresh = thresh >> 4; /* touchtones must match within 12 dB */
|
|
for (k = 0; k < NCOEFF; k++) {
|
|
if (sk1[k] < thresh)
|
|
continue; /* ignore */
|
|
/* good level found. This is allowed only one time per group */
|
|
if (k < NCOEFF / 2) {
|
|
/* lowgroup*/
|
|
if (lgrp >= 0) {
|
|
// Bad. Another tone found. */
|
|
lgrp = -1;
|
|
break;
|
|
} else
|
|
lgrp = k;
|
|
} else { /* higroup */
|
|
if (hgrp >= 0) {
|
|
// Bad. Another tone found. */
|
|
hgrp = -1;
|
|
break;
|
|
} else
|
|
hgrp = k - NCOEFF/2;
|
|
}
|
|
}
|
|
if ((lgrp >= 0) && (hgrp >= 0)) {
|
|
what = dtmf_matrix[lgrp][hgrp];
|
|
if (dtmf->last != ' ' && dtmf->last != '.')
|
|
dtmf->last = what; /* min. 1 non-DTMF between DTMF */
|
|
} else
|
|
what = '.';
|
|
} else
|
|
what = '.';
|
|
}
|
|
if (dtmf->debug & DEBUG_DTMF_DETECT)
|
|
printk(KERN_DEBUG "DTMF: last(%c) what(%c)\n",
|
|
dtmf->last, what);
|
|
if ((what != dtmf->last) && (what != ' ') && (what != '.')) {
|
|
if (dtmf->debug & DEBUG_DTMF_TONE)
|
|
printk(KERN_DEBUG "DTMF: tone='%c'\n", what);
|
|
k = what | DTMF_TONE_VAL;
|
|
mISDN_queue_data(&dtmf->inst, FLG_MSG_UP, PH_CONTROL | INDICATION,
|
|
0, sizeof(int), &k, 0);
|
|
}
|
|
dtmf->last = what;
|
|
}
|
|
|
|
/*
|
|
* Decode audio stream into signed u16
|
|
* start detection if enough data was sampled
|
|
*/
|
|
static void
|
|
isdn_audio_calc_dtmf(dtmf_t *dtmf, struct sk_buff *skb)
|
|
{
|
|
int len = skb->len;
|
|
u_char *p = skb->data;
|
|
int i;
|
|
int c;
|
|
|
|
while (len) {
|
|
c = DTMF_NPOINTS - dtmf->idx;
|
|
if (c > len)
|
|
c = len;
|
|
if (c <= 0)
|
|
break;
|
|
for (i = 0; i < c; i++) {
|
|
if (test_bit(FLG_DTMF_ULAW, &dtmf->Flags))
|
|
dtmf->buf[dtmf->idx++] =
|
|
isdn_audio_ulaw_to_s16[*p++] >> (15 - AMP_BITS);
|
|
else
|
|
dtmf->buf[dtmf->idx++] =
|
|
isdn_audio_alaw_to_s16[*p++] >> (15 - AMP_BITS);
|
|
}
|
|
if (dtmf->idx == DTMF_NPOINTS) {
|
|
isdn_audio_goertzel(dtmf);
|
|
dtmf->idx = 0;
|
|
}
|
|
len -= c;
|
|
}
|
|
}
|
|
|
|
static void
|
|
dtmf_reset(dtmf_t *dtmf)
|
|
{
|
|
dtmf->last = ' ';
|
|
dtmf->idx = 0;
|
|
}
|
|
|
|
#ifdef OBSOLETE
|
|
static int
|
|
dtmf_from_up(mISDNinstance_t *inst, struct sk_buff *skb)
|
|
{
|
|
dtmf_t *dtmf;
|
|
mISDN_head_t *hh;
|
|
int *data;
|
|
int err = 0;
|
|
|
|
dtmf = inst->privat;
|
|
hh = mISDN_HEAD_P(skb);
|
|
switch(hh->prim) {
|
|
case (PH_CONTROL | REQUEST):
|
|
if ((hh->dinfo == 0) && (skb->len >= sizeof(int))) {
|
|
data = (int *)skb->data;
|
|
if (dtmf->debug & DEBUG_DTMF_CTRL)
|
|
printk(KERN_DEBUG "DTMF: PH_CONTROL REQ data %04x\n",
|
|
*data);
|
|
if (*data == DTMF_TONE_START) {
|
|
test_and_set_bit(FLG_DTMF_ACTIV, &dtmf->Flags);
|
|
dtmf_reset(dtmf);
|
|
break;
|
|
} else if (*data == DTMF_TONE_STOP) {
|
|
test_and_clear_bit(FLG_DTMF_ACTIV, &dtmf->Flags);
|
|
dtmf_reset(dtmf);
|
|
break;
|
|
}
|
|
}
|
|
/* Fall trough in case of not handled function */
|
|
default:
|
|
return(mISDN_queue_down(inst, 0, skb));
|
|
}
|
|
if (!err)
|
|
dev_kfree_skb(skb);
|
|
return(err);
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
dtmf_function(mISDNinstance_t *inst, struct sk_buff *skb)
|
|
{
|
|
dtmf_t *dtmf;
|
|
mISDN_head_t *hh;
|
|
|
|
dtmf = inst->privat;
|
|
hh = mISDN_HEAD_P(skb);
|
|
switch(hh->prim) {
|
|
case (PH_DATA | CONFIRM):
|
|
hh->prim = DL_DATA | CONFIRM;
|
|
break;
|
|
case (DL_DATA_IND):
|
|
case (PH_DATA_IND):
|
|
if (test_bit(FLG_DTMF_ACTIV, &dtmf->Flags))
|
|
isdn_audio_calc_dtmf(dtmf, skb);
|
|
hh->prim = DL_DATA_IND;
|
|
break;
|
|
case (PH_CONTROL | REQUEST):
|
|
if ((hh->dinfo == 0) && (skb->len >= sizeof(int))) {
|
|
int *data = (int *)skb->data;
|
|
if (dtmf->debug & DEBUG_DTMF_CTRL)
|
|
printk(KERN_DEBUG "DTMF: PH_CONTROL REQ data %04x\n",
|
|
*data);
|
|
if (*data == DTMF_TONE_START) {
|
|
test_and_set_bit(FLG_DTMF_ACTIV, &dtmf->Flags);
|
|
dtmf_reset(dtmf);
|
|
dev_kfree_skb(skb);
|
|
return(0);
|
|
} else if (*data == DTMF_TONE_STOP) {
|
|
test_and_clear_bit(FLG_DTMF_ACTIV, &dtmf->Flags);
|
|
dtmf_reset(dtmf);
|
|
dev_kfree_skb(skb);
|
|
return(0);
|
|
}
|
|
}
|
|
break;
|
|
case (PH_ACTIVATE | CONFIRM):
|
|
hh->prim = DL_ESTABLISH | CONFIRM;
|
|
break;
|
|
case (PH_ACTIVATE | INDICATION):
|
|
hh->prim = DL_ESTABLISH | INDICATION;
|
|
break;
|
|
case (PH_DEACTIVATE | CONFIRM):
|
|
hh->prim = DL_RELEASE | CONFIRM;
|
|
break;
|
|
case (PH_DEACTIVATE | INDICATION):
|
|
hh->prim = DL_RELEASE | INDICATION;
|
|
break;
|
|
}
|
|
return(mISDN_queue_message(inst, hh->addr & MSG_DIR_MASK, skb));
|
|
}
|
|
|
|
static void
|
|
release_dtmf(dtmf_t *dtmf) {
|
|
mISDNinstance_t *inst = &dtmf->inst;
|
|
u_long flags;
|
|
|
|
spin_lock_irqsave(&dtmf_obj.lock, flags);
|
|
list_del(&dtmf->list);
|
|
spin_unlock_irqrestore(&dtmf_obj.lock, flags);
|
|
mISDN_ctrl(inst, MGR_UNREGLAYER | REQUEST, NULL);
|
|
kfree(dtmf);
|
|
}
|
|
|
|
static int
|
|
new_dtmf(mISDNstack_t *st, mISDN_pid_t *pid) {
|
|
dtmf_t *n_dtmf;
|
|
int err;
|
|
u_long flags;
|
|
|
|
if (!st || !pid)
|
|
return(-EINVAL);
|
|
if (!(n_dtmf = kmalloc(sizeof(dtmf_t), GFP_ATOMIC))) {
|
|
printk(KERN_ERR "kmalloc dtmf_t failed\n");
|
|
return(-ENOMEM);
|
|
}
|
|
memset(n_dtmf, 0, sizeof(dtmf_t));
|
|
memcpy(&n_dtmf->inst.pid, pid, sizeof(mISDN_pid_t));
|
|
mISDN_init_instance(&n_dtmf->inst, &dtmf_obj, n_dtmf, dtmf_function);
|
|
if (!mISDN_SetHandledPID(&dtmf_obj, &n_dtmf->inst.pid)) {
|
|
int_error();
|
|
kfree(n_dtmf);
|
|
return(-ENOPROTOOPT);
|
|
}
|
|
n_dtmf->debug = debug;
|
|
spin_lock_irqsave(&dtmf_obj.lock, flags);
|
|
list_add_tail(&n_dtmf->list, &dtmf_obj.ilist);
|
|
spin_unlock_irqrestore(&dtmf_obj.lock, flags);
|
|
err = mISDN_ctrl(st, MGR_REGLAYER | INDICATION, &n_dtmf->inst);
|
|
if (err) {
|
|
list_del(&n_dtmf->list);
|
|
kfree(n_dtmf);
|
|
}
|
|
return(err);
|
|
}
|
|
|
|
#if 0
|
|
static int
|
|
dtmf_status(dtmf_t *dtmf, status_info_dtmf_t *si)
|
|
{
|
|
|
|
if (!si)
|
|
return(-EINVAL);
|
|
memset(si, 0, sizeof(status_info_dtmf_t));
|
|
si->len = sizeof(status_info_dtmf_t) - 2*sizeof(int);
|
|
si->typ = STATUS_INFO_L1;
|
|
si->protocol = dtmf->inst.pid.protocol[1];
|
|
if (test_bit(FLG_L1_ACTIVATED, &dtmf->Flags))
|
|
si->status = 1;
|
|
si->state = dtmf->dtmfm.state;
|
|
si->Flags = dtmf->Flags;
|
|
si->T3 = TIMER3_VALUE;
|
|
si->debug = dtmf->delay;
|
|
si->debug = dtmf->debug;
|
|
return(0);
|
|
}
|
|
|
|
#endif
|
|
|
|
static char MName[] = "DTMF";
|
|
|
|
#ifdef MODULE
|
|
MODULE_AUTHOR("Karsten Keil");
|
|
#ifdef OLD_MODULE_PARAM
|
|
MODULE_PARM(debug, "1i");
|
|
#else
|
|
module_param (debug, uint, S_IRUGO | S_IWUSR);
|
|
#endif
|
|
MODULE_PARM_DESC (debug, "dtmf debug mask");
|
|
#ifdef MODULE_LICENSE
|
|
MODULE_LICENSE("GPL");
|
|
#endif
|
|
#endif
|
|
|
|
static int
|
|
dtmf_manager(void *data, u_int prim, void *arg) {
|
|
mISDNinstance_t *inst = data;
|
|
dtmf_t *dtmf_l;
|
|
int ret = -EINVAL;
|
|
u_long flags;
|
|
|
|
if (debug & DEBUG_DTMF_MGR)
|
|
printk(KERN_DEBUG "dtmf_manager data:%p prim:%x arg:%p\n", data, prim, arg);
|
|
if (!data)
|
|
return(ret);
|
|
spin_lock_irqsave(&dtmf_obj.lock, flags);
|
|
list_for_each_entry(dtmf_l, &dtmf_obj.ilist, list) {
|
|
if (&dtmf_l->inst == inst) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&dtmf_obj.lock, flags);
|
|
if (prim == (MGR_NEWLAYER | REQUEST))
|
|
return(new_dtmf(data, arg));
|
|
if (ret) {
|
|
printk(KERN_WARNING "dtmf_manager prim(%x) no instance\n", prim);
|
|
return(ret);
|
|
}
|
|
switch(prim) {
|
|
case MGR_CLRSTPARA | INDICATION:
|
|
break;
|
|
#ifdef OBSOLETE
|
|
case MGR_CLONELAYER | REQUEST:
|
|
break;
|
|
case MGR_CONNECT | REQUEST:
|
|
return(mISDN_ConnectIF(inst, arg));
|
|
case MGR_SETIF | REQUEST:
|
|
case MGR_SETIF | INDICATION:
|
|
return(mISDN_SetIF(inst, arg, prim, dtmf_from_up, dtmf_from_down, dtmf_l));
|
|
case MGR_DISCONNECT | REQUEST:
|
|
case MGR_DISCONNECT | INDICATION:
|
|
return(mISDN_DisConnectIF(inst, arg));
|
|
#endif
|
|
case MGR_UNREGLAYER | REQUEST:
|
|
case MGR_RELEASE | INDICATION:
|
|
if (debug & DEBUG_DTMF_MGR)
|
|
printk(KERN_DEBUG "release_dtmf id %x\n", dtmf_l->inst.st->id);
|
|
release_dtmf(dtmf_l);
|
|
break;
|
|
// case MGR_STATUS | REQUEST:
|
|
// return(dtmf_status(dtmf_l, arg));
|
|
default:
|
|
if (debug & DEBUG_DTMF_MGR)
|
|
printk(KERN_WARNING "dtmf_manager prim %x not handled\n", prim);
|
|
return(-EINVAL);
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
static int dtmf_init(void)
|
|
{
|
|
int err;
|
|
|
|
printk(KERN_INFO "DTMF modul version %s\n", mISDN_getrev(mISDN_dtmf_revision));
|
|
#ifdef MODULE
|
|
dtmf_obj.owner = THIS_MODULE;
|
|
#endif
|
|
dtmf_obj.name = MName;
|
|
dtmf_obj.BPROTO.protocol[2] = ISDN_PID_L2_B_TRANSDTMF;
|
|
dtmf_obj.own_ctrl = dtmf_manager;
|
|
spin_lock_init(&dtmf_obj.lock);
|
|
INIT_LIST_HEAD(&dtmf_obj.ilist);
|
|
if ((err = mISDN_register(&dtmf_obj))) {
|
|
printk(KERN_ERR "Can't register %s error(%d)\n", MName, err);
|
|
} else
|
|
mISDN_module_register(THIS_MODULE);
|
|
return(err);
|
|
}
|
|
|
|
static void dtmf_cleanup(void)
|
|
{
|
|
int err;
|
|
dtmf_t *dtmf, *nd;
|
|
|
|
mISDN_module_unregister(THIS_MODULE);
|
|
|
|
if ((err = mISDN_unregister(&dtmf_obj))) {
|
|
printk(KERN_ERR "Can't unregister DTMF error(%d)\n", err);
|
|
}
|
|
if (!list_empty(&dtmf_obj.ilist)) {
|
|
printk(KERN_WARNING "dtmf inst list not empty\n");
|
|
list_for_each_entry_safe(dtmf, nd, &dtmf_obj.ilist, list)
|
|
release_dtmf(dtmf);
|
|
}
|
|
}
|
|
|
|
module_init(dtmf_init);
|
|
module_exit(dtmf_cleanup);
|