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![Adrian Bunk](/assets/img/avatar_default.png)
This patch contains the following possible cleanups: - make needlessly global code static - remove the following unused global function: - isdn_audio.c: isdn_audio_2adpcm_flush - remove the following unused struct: - isdn_net.c: isdn_concap_demand_dial_dops Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
710 lines
20 KiB
C
710 lines
20 KiB
C
/* $Id: isdn_audio.c,v 1.1.2.2 2004/01/12 22:37:18 keil Exp $
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*
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* Linux ISDN subsystem, audio conversion and compression (linklevel).
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*
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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/isdn.h>
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#include "isdn_audio.h"
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#include "isdn_common.h"
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char *isdn_audio_revision = "$Revision: 1.1.2.2 $";
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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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* linear <-> adpcm conversion stuff
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* Most parts from the mgetty-package.
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* (C) by Gert Doering and Klaus Weidner
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* Used by permission of Gert Doering
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*/
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#define ZEROTRAP /* turn on the trap as per the MIL-STD */
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#undef ZEROTRAP
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#define BIAS 0x84 /* define the add-in bias for 16 bit samples */
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#define CLIP 32635
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static unsigned char
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isdn_audio_linear2ulaw(int sample)
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{
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static int exp_lut[256] =
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{
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0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
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4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
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5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
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5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
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6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
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6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
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6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
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6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
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7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
|
|
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
|
|
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
|
|
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
|
|
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
|
|
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
|
|
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
|
|
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
|
|
};
|
|
int sign,
|
|
exponent,
|
|
mantissa;
|
|
unsigned char ulawbyte;
|
|
|
|
/* Get the sample into sign-magnitude. */
|
|
sign = (sample >> 8) & 0x80; /* set aside the sign */
|
|
if (sign != 0)
|
|
sample = -sample; /* get magnitude */
|
|
if (sample > CLIP)
|
|
sample = CLIP; /* clip the magnitude */
|
|
|
|
/* Convert from 16 bit linear to ulaw. */
|
|
sample = sample + BIAS;
|
|
exponent = exp_lut[(sample >> 7) & 0xFF];
|
|
mantissa = (sample >> (exponent + 3)) & 0x0F;
|
|
ulawbyte = ~(sign | (exponent << 4) | mantissa);
|
|
#ifdef ZEROTRAP
|
|
/* optional CCITT trap */
|
|
if (ulawbyte == 0)
|
|
ulawbyte = 0x02;
|
|
#endif
|
|
return (ulawbyte);
|
|
}
|
|
|
|
|
|
static int Mx[3][8] =
|
|
{
|
|
{0x3800, 0x5600, 0, 0, 0, 0, 0, 0},
|
|
{0x399a, 0x3a9f, 0x4d14, 0x6607, 0, 0, 0, 0},
|
|
{0x3556, 0x3556, 0x399A, 0x3A9F, 0x4200, 0x4D14, 0x6607, 0x6607},
|
|
};
|
|
|
|
static int bitmask[9] =
|
|
{
|
|
0, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff
|
|
};
|
|
|
|
static int
|
|
isdn_audio_get_bits(adpcm_state * s, unsigned char **in, int *len)
|
|
{
|
|
while (s->nleft < s->nbits) {
|
|
int d = *((*in)++);
|
|
(*len)--;
|
|
s->word = (s->word << 8) | d;
|
|
s->nleft += 8;
|
|
}
|
|
s->nleft -= s->nbits;
|
|
return (s->word >> s->nleft) & bitmask[s->nbits];
|
|
}
|
|
|
|
static void
|
|
isdn_audio_put_bits(int data, int nbits, adpcm_state * s,
|
|
unsigned char **out, int *len)
|
|
{
|
|
s->word = (s->word << nbits) | (data & bitmask[nbits]);
|
|
s->nleft += nbits;
|
|
while (s->nleft >= 8) {
|
|
int d = (s->word >> (s->nleft - 8));
|
|
*(out[0]++) = d & 255;
|
|
(*len)++;
|
|
s->nleft -= 8;
|
|
}
|
|
}
|
|
|
|
adpcm_state *
|
|
isdn_audio_adpcm_init(adpcm_state * s, int nbits)
|
|
{
|
|
if (!s)
|
|
s = (adpcm_state *) kmalloc(sizeof(adpcm_state), GFP_ATOMIC);
|
|
if (s) {
|
|
s->a = 0;
|
|
s->d = 5;
|
|
s->word = 0;
|
|
s->nleft = 0;
|
|
s->nbits = nbits;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
dtmf_state *
|
|
isdn_audio_dtmf_init(dtmf_state * s)
|
|
{
|
|
if (!s)
|
|
s = (dtmf_state *) kmalloc(sizeof(dtmf_state), GFP_ATOMIC);
|
|
if (s) {
|
|
s->idx = 0;
|
|
s->last = ' ';
|
|
}
|
|
return s;
|
|
}
|
|
|
|
/*
|
|
* Decompression of adpcm data to a/u-law
|
|
*
|
|
*/
|
|
|
|
int
|
|
isdn_audio_adpcm2xlaw(adpcm_state * s, int fmt, unsigned char *in,
|
|
unsigned char *out, int len)
|
|
{
|
|
int a = s->a;
|
|
int d = s->d;
|
|
int nbits = s->nbits;
|
|
int olen = 0;
|
|
|
|
while (len) {
|
|
int e = isdn_audio_get_bits(s, &in, &len);
|
|
int sign;
|
|
|
|
if (nbits == 4 && e == 0)
|
|
d = 4;
|
|
sign = (e >> (nbits - 1)) ? -1 : 1;
|
|
e &= bitmask[nbits - 1];
|
|
a += sign * ((e << 1) + 1) * d >> 1;
|
|
if (d & 1)
|
|
a++;
|
|
if (fmt)
|
|
*out++ = isdn_audio_ulaw_to_alaw[
|
|
isdn_audio_linear2ulaw(a << 2)];
|
|
else
|
|
*out++ = isdn_audio_linear2ulaw(a << 2);
|
|
olen++;
|
|
d = (d * Mx[nbits - 2][e] + 0x2000) >> 14;
|
|
if (d < 5)
|
|
d = 5;
|
|
}
|
|
s->a = a;
|
|
s->d = d;
|
|
return olen;
|
|
}
|
|
|
|
int
|
|
isdn_audio_xlaw2adpcm(adpcm_state * s, int fmt, unsigned char *in,
|
|
unsigned char *out, int len)
|
|
{
|
|
int a = s->a;
|
|
int d = s->d;
|
|
int nbits = s->nbits;
|
|
int olen = 0;
|
|
|
|
while (len--) {
|
|
int e = 0,
|
|
nmax = 1 << (nbits - 1);
|
|
int sign,
|
|
delta;
|
|
|
|
if (fmt)
|
|
delta = (isdn_audio_alaw_to_s16[*in++] >> 2) - a;
|
|
else
|
|
delta = (isdn_audio_ulaw_to_s16[*in++] >> 2) - a;
|
|
if (delta < 0) {
|
|
e = nmax;
|
|
delta = -delta;
|
|
}
|
|
while (--nmax && delta > d) {
|
|
delta -= d;
|
|
e++;
|
|
}
|
|
if (nbits == 4 && ((e & 0x0f) == 0))
|
|
e = 8;
|
|
isdn_audio_put_bits(e, nbits, s, &out, &olen);
|
|
sign = (e >> (nbits - 1)) ? -1 : 1;
|
|
e &= bitmask[nbits - 1];
|
|
|
|
a += sign * ((e << 1) + 1) * d >> 1;
|
|
if (d & 1)
|
|
a++;
|
|
d = (d * Mx[nbits - 2][e] + 0x2000) >> 14;
|
|
if (d < 5)
|
|
d = 5;
|
|
}
|
|
s->a = a;
|
|
s->d = d;
|
|
return olen;
|
|
}
|
|
|
|
/*
|
|
* Goertzel algorithm.
|
|
* See http://ptolemy.eecs.berkeley.edu/~pino/Ptolemy/papers/96/dtmf_ict/
|
|
* for more info.
|
|
* Result is stored into an sk_buff and queued up for later
|
|
* evaluation.
|
|
*/
|
|
static void
|
|
isdn_audio_goertzel(int *sample, modem_info * info)
|
|
{
|
|
int sk,
|
|
sk1,
|
|
sk2;
|
|
int k,
|
|
n;
|
|
struct sk_buff *skb;
|
|
int *result;
|
|
|
|
skb = dev_alloc_skb(sizeof(int) * NCOEFF);
|
|
if (!skb) {
|
|
printk(KERN_WARNING
|
|
"isdn_audio: Could not alloc DTMF result for ttyI%d\n",
|
|
info->line);
|
|
return;
|
|
}
|
|
result = (int *) skb_put(skb, sizeof(int) * NCOEFF);
|
|
for (k = 0; k < NCOEFF; k++) {
|
|
sk = sk1 = sk2 = 0;
|
|
for (n = 0; n < DTMF_NPOINTS; n++) {
|
|
sk = sample[n] + ((cos2pik[k] * sk1) >> 15) - sk2;
|
|
sk2 = sk1;
|
|
sk1 = sk;
|
|
}
|
|
/* Avoid overflows */
|
|
sk >>= 1;
|
|
sk2 >>= 1;
|
|
/* compute |X(k)|**2 */
|
|
/* report overflows. This should not happen. */
|
|
/* Comment this out if desired */
|
|
if (sk < -32768 || sk > 32767)
|
|
printk(KERN_DEBUG
|
|
"isdn_audio: dtmf goertzel overflow, sk=%d\n", sk);
|
|
if (sk2 < -32768 || sk2 > 32767)
|
|
printk(KERN_DEBUG
|
|
"isdn_audio: dtmf goertzel overflow, sk2=%d\n", sk2);
|
|
result[k] =
|
|
((sk * sk) >> AMP_BITS) -
|
|
((((cos2pik[k] * sk) >> 15) * sk2) >> AMP_BITS) +
|
|
((sk2 * sk2) >> AMP_BITS);
|
|
}
|
|
skb_queue_tail(&info->dtmf_queue, skb);
|
|
isdn_timer_ctrl(ISDN_TIMER_MODEMREAD, 1);
|
|
}
|
|
|
|
void
|
|
isdn_audio_eval_dtmf(modem_info * info)
|
|
{
|
|
struct sk_buff *skb;
|
|
int *result;
|
|
dtmf_state *s;
|
|
int silence;
|
|
int i;
|
|
int di;
|
|
int ch;
|
|
int grp[2];
|
|
char what;
|
|
char *p;
|
|
int thresh;
|
|
|
|
while ((skb = skb_dequeue(&info->dtmf_queue))) {
|
|
result = (int *) skb->data;
|
|
s = info->dtmf_state;
|
|
grp[LOGRP] = grp[HIGRP] = -1;
|
|
silence = 0;
|
|
thresh = 0;
|
|
for (i = 0; i < NCOEFF; i++) {
|
|
if (result[i] > DTMF_TRESH) {
|
|
if (result[i] > thresh)
|
|
thresh = result[i];
|
|
}
|
|
else if (result[i] < SILENCE_TRESH)
|
|
silence++;
|
|
}
|
|
if (silence == NCOEFF)
|
|
what = ' ';
|
|
else {
|
|
if (thresh > 0) {
|
|
thresh = thresh >> 4; /* touchtones must match within 12 dB */
|
|
for (i = 0; i < NCOEFF; i++) {
|
|
if (result[i] < thresh)
|
|
continue; /* ignore */
|
|
/* good level found. This is allowed only one time per group */
|
|
if (i < NCOEFF / 2) {
|
|
/* lowgroup*/
|
|
if (grp[LOGRP] >= 0) {
|
|
// Bad. Another tone found. */
|
|
grp[LOGRP] = -1;
|
|
break;
|
|
}
|
|
else
|
|
grp[LOGRP] = i;
|
|
}
|
|
else { /* higroup */
|
|
if (grp[HIGRP] >= 0) { // Bad. Another tone found. */
|
|
grp[HIGRP] = -1;
|
|
break;
|
|
}
|
|
else
|
|
grp[HIGRP] = i - NCOEFF/2;
|
|
}
|
|
}
|
|
if ((grp[LOGRP] >= 0) && (grp[HIGRP] >= 0)) {
|
|
what = dtmf_matrix[grp[LOGRP]][grp[HIGRP]];
|
|
if (s->last != ' ' && s->last != '.')
|
|
s->last = what; /* min. 1 non-DTMF between DTMF */
|
|
} else
|
|
what = '.';
|
|
}
|
|
else
|
|
what = '.';
|
|
}
|
|
if ((what != s->last) && (what != ' ') && (what != '.')) {
|
|
printk(KERN_DEBUG "dtmf: tt='%c'\n", what);
|
|
p = skb->data;
|
|
*p++ = 0x10;
|
|
*p = what;
|
|
skb_trim(skb, 2);
|
|
ISDN_AUDIO_SKB_DLECOUNT(skb) = 0;
|
|
ISDN_AUDIO_SKB_LOCK(skb) = 0;
|
|
di = info->isdn_driver;
|
|
ch = info->isdn_channel;
|
|
__skb_queue_tail(&dev->drv[di]->rpqueue[ch], skb);
|
|
dev->drv[di]->rcvcount[ch] += 2;
|
|
/* Schedule dequeuing */
|
|
if ((dev->modempoll) && (info->rcvsched))
|
|
isdn_timer_ctrl(ISDN_TIMER_MODEMREAD, 1);
|
|
wake_up_interruptible(&dev->drv[di]->rcv_waitq[ch]);
|
|
} else
|
|
kfree_skb(skb);
|
|
s->last = what;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Decode DTMF tones, queue result in separate sk_buf for
|
|
* later examination.
|
|
* Parameters:
|
|
* s = pointer to state-struct.
|
|
* buf = input audio data
|
|
* len = size of audio data.
|
|
* fmt = audio data format (0 = ulaw, 1 = alaw)
|
|
*/
|
|
void
|
|
isdn_audio_calc_dtmf(modem_info * info, unsigned char *buf, int len, int fmt)
|
|
{
|
|
dtmf_state *s = info->dtmf_state;
|
|
int i;
|
|
int c;
|
|
|
|
while (len) {
|
|
c = DTMF_NPOINTS - s->idx;
|
|
if (c > len)
|
|
c = len;
|
|
if (c <= 0)
|
|
break;
|
|
for (i = 0; i < c; i++) {
|
|
if (fmt)
|
|
s->buf[s->idx++] =
|
|
isdn_audio_alaw_to_s16[*buf++] >> (15 - AMP_BITS);
|
|
else
|
|
s->buf[s->idx++] =
|
|
isdn_audio_ulaw_to_s16[*buf++] >> (15 - AMP_BITS);
|
|
}
|
|
if (s->idx == DTMF_NPOINTS) {
|
|
isdn_audio_goertzel(s->buf, info);
|
|
s->idx = 0;
|
|
}
|
|
len -= c;
|
|
}
|
|
}
|
|
|
|
silence_state *
|
|
isdn_audio_silence_init(silence_state * s)
|
|
{
|
|
if (!s)
|
|
s = (silence_state *) kmalloc(sizeof(silence_state), GFP_ATOMIC);
|
|
if (s) {
|
|
s->idx = 0;
|
|
s->state = 0;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
void
|
|
isdn_audio_calc_silence(modem_info * info, unsigned char *buf, int len, int fmt)
|
|
{
|
|
silence_state *s = info->silence_state;
|
|
int i;
|
|
signed char c;
|
|
|
|
if (!info->emu.vpar[1]) return;
|
|
|
|
for (i = 0; i < len; i++) {
|
|
if (fmt)
|
|
c = isdn_audio_alaw_to_ulaw[*buf++];
|
|
else
|
|
c = *buf++;
|
|
|
|
if (c > 0) c -= 128;
|
|
c = abs(c);
|
|
|
|
if (c > (info->emu.vpar[1] * 4)) {
|
|
s->idx = 0;
|
|
s->state = 1;
|
|
} else {
|
|
if (s->idx < 210000) s->idx++;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
isdn_audio_put_dle_code(modem_info * info, u_char code)
|
|
{
|
|
struct sk_buff *skb;
|
|
int di;
|
|
int ch;
|
|
char *p;
|
|
|
|
skb = dev_alloc_skb(2);
|
|
if (!skb) {
|
|
printk(KERN_WARNING
|
|
"isdn_audio: Could not alloc skb for ttyI%d\n",
|
|
info->line);
|
|
return;
|
|
}
|
|
p = (char *) skb_put(skb, 2);
|
|
p[0] = 0x10;
|
|
p[1] = code;
|
|
ISDN_AUDIO_SKB_DLECOUNT(skb) = 0;
|
|
ISDN_AUDIO_SKB_LOCK(skb) = 0;
|
|
di = info->isdn_driver;
|
|
ch = info->isdn_channel;
|
|
__skb_queue_tail(&dev->drv[di]->rpqueue[ch], skb);
|
|
dev->drv[di]->rcvcount[ch] += 2;
|
|
/* Schedule dequeuing */
|
|
if ((dev->modempoll) && (info->rcvsched))
|
|
isdn_timer_ctrl(ISDN_TIMER_MODEMREAD, 1);
|
|
wake_up_interruptible(&dev->drv[di]->rcv_waitq[ch]);
|
|
}
|
|
|
|
void
|
|
isdn_audio_eval_silence(modem_info * info)
|
|
{
|
|
silence_state *s = info->silence_state;
|
|
char what;
|
|
|
|
what = ' ';
|
|
|
|
if (s->idx > (info->emu.vpar[2] * 800)) {
|
|
s->idx = 0;
|
|
if (!s->state) { /* silence from beginning of rec */
|
|
what = 's';
|
|
} else {
|
|
what = 'q';
|
|
}
|
|
}
|
|
if ((what == 's') || (what == 'q')) {
|
|
printk(KERN_DEBUG "ttyI%d: %s\n", info->line,
|
|
(what=='s') ? "silence":"quiet");
|
|
isdn_audio_put_dle_code(info, what);
|
|
}
|
|
}
|