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Diffstat (limited to 'drivers/isdn/i4l/isdn_audio.c')
-rw-r--r--drivers/isdn/i4l/isdn_audio.c711
1 files changed, 0 insertions, 711 deletions
diff --git a/drivers/isdn/i4l/isdn_audio.c b/drivers/isdn/i4l/isdn_audio.c
deleted file mode 100644
index b6bcd1eca128..000000000000
--- a/drivers/isdn/i4l/isdn_audio.c
+++ /dev/null
@@ -1,711 +0,0 @@
-/* $Id: isdn_audio.c,v 1.1.2.2 2004/01/12 22:37:18 keil Exp $
- *
- * Linux ISDN subsystem, audio conversion and compression (linklevel).
- *
- * Copyright 1994-1999 by Fritz Elfert (fritz@isdn4linux.de)
- * DTMF code (c) 1996 by Christian Mock (cm@kukuruz.ping.at)
- * Silence detection (c) 1998 by Armin Schindler (mac@gismo.telekom.de)
- *
- * This software may be used and distributed according to the terms
- * of the GNU General Public License, incorporated herein by reference.
- *
- */
-
-#include <linux/isdn.h>
-#include <linux/slab.h>
-#include "isdn_audio.h"
-#include "isdn_common.h"
-
-char *isdn_audio_revision = "$Revision: 1.1.2.2 $";
-
-/*
- * Misc. lookup-tables.
- */
-
-/* ulaw -> signed 16-bit */
-static short isdn_audio_ulaw_to_s16[] =
-{
- 0x8284, 0x8684, 0x8a84, 0x8e84, 0x9284, 0x9684, 0x9a84, 0x9e84,
- 0xa284, 0xa684, 0xaa84, 0xae84, 0xb284, 0xb684, 0xba84, 0xbe84,
- 0xc184, 0xc384, 0xc584, 0xc784, 0xc984, 0xcb84, 0xcd84, 0xcf84,
- 0xd184, 0xd384, 0xd584, 0xd784, 0xd984, 0xdb84, 0xdd84, 0xdf84,
- 0xe104, 0xe204, 0xe304, 0xe404, 0xe504, 0xe604, 0xe704, 0xe804,
- 0xe904, 0xea04, 0xeb04, 0xec04, 0xed04, 0xee04, 0xef04, 0xf004,
- 0xf0c4, 0xf144, 0xf1c4, 0xf244, 0xf2c4, 0xf344, 0xf3c4, 0xf444,
- 0xf4c4, 0xf544, 0xf5c4, 0xf644, 0xf6c4, 0xf744, 0xf7c4, 0xf844,
- 0xf8a4, 0xf8e4, 0xf924, 0xf964, 0xf9a4, 0xf9e4, 0xfa24, 0xfa64,
- 0xfaa4, 0xfae4, 0xfb24, 0xfb64, 0xfba4, 0xfbe4, 0xfc24, 0xfc64,
- 0xfc94, 0xfcb4, 0xfcd4, 0xfcf4, 0xfd14, 0xfd34, 0xfd54, 0xfd74,
- 0xfd94, 0xfdb4, 0xfdd4, 0xfdf4, 0xfe14, 0xfe34, 0xfe54, 0xfe74,
- 0xfe8c, 0xfe9c, 0xfeac, 0xfebc, 0xfecc, 0xfedc, 0xfeec, 0xfefc,
- 0xff0c, 0xff1c, 0xff2c, 0xff3c, 0xff4c, 0xff5c, 0xff6c, 0xff7c,
- 0xff88, 0xff90, 0xff98, 0xffa0, 0xffa8, 0xffb0, 0xffb8, 0xffc0,
- 0xffc8, 0xffd0, 0xffd8, 0xffe0, 0xffe8, 0xfff0, 0xfff8, 0x0000,
- 0x7d7c, 0x797c, 0x757c, 0x717c, 0x6d7c, 0x697c, 0x657c, 0x617c,
- 0x5d7c, 0x597c, 0x557c, 0x517c, 0x4d7c, 0x497c, 0x457c, 0x417c,
- 0x3e7c, 0x3c7c, 0x3a7c, 0x387c, 0x367c, 0x347c, 0x327c, 0x307c,
- 0x2e7c, 0x2c7c, 0x2a7c, 0x287c, 0x267c, 0x247c, 0x227c, 0x207c,
- 0x1efc, 0x1dfc, 0x1cfc, 0x1bfc, 0x1afc, 0x19fc, 0x18fc, 0x17fc,
- 0x16fc, 0x15fc, 0x14fc, 0x13fc, 0x12fc, 0x11fc, 0x10fc, 0x0ffc,
- 0x0f3c, 0x0ebc, 0x0e3c, 0x0dbc, 0x0d3c, 0x0cbc, 0x0c3c, 0x0bbc,
- 0x0b3c, 0x0abc, 0x0a3c, 0x09bc, 0x093c, 0x08bc, 0x083c, 0x07bc,
- 0x075c, 0x071c, 0x06dc, 0x069c, 0x065c, 0x061c, 0x05dc, 0x059c,
- 0x055c, 0x051c, 0x04dc, 0x049c, 0x045c, 0x041c, 0x03dc, 0x039c,
- 0x036c, 0x034c, 0x032c, 0x030c, 0x02ec, 0x02cc, 0x02ac, 0x028c,
- 0x026c, 0x024c, 0x022c, 0x020c, 0x01ec, 0x01cc, 0x01ac, 0x018c,
- 0x0174, 0x0164, 0x0154, 0x0144, 0x0134, 0x0124, 0x0114, 0x0104,
- 0x00f4, 0x00e4, 0x00d4, 0x00c4, 0x00b4, 0x00a4, 0x0094, 0x0084,
- 0x0078, 0x0070, 0x0068, 0x0060, 0x0058, 0x0050, 0x0048, 0x0040,
- 0x0038, 0x0030, 0x0028, 0x0020, 0x0018, 0x0010, 0x0008, 0x0000
-};
-
-/* alaw -> signed 16-bit */
-static short isdn_audio_alaw_to_s16[] =
-{
- 0x13fc, 0xec04, 0x0144, 0xfebc, 0x517c, 0xae84, 0x051c, 0xfae4,
- 0x0a3c, 0xf5c4, 0x0048, 0xffb8, 0x287c, 0xd784, 0x028c, 0xfd74,
- 0x1bfc, 0xe404, 0x01cc, 0xfe34, 0x717c, 0x8e84, 0x071c, 0xf8e4,
- 0x0e3c, 0xf1c4, 0x00c4, 0xff3c, 0x387c, 0xc784, 0x039c, 0xfc64,
- 0x0ffc, 0xf004, 0x0104, 0xfefc, 0x417c, 0xbe84, 0x041c, 0xfbe4,
- 0x083c, 0xf7c4, 0x0008, 0xfff8, 0x207c, 0xdf84, 0x020c, 0xfdf4,
- 0x17fc, 0xe804, 0x018c, 0xfe74, 0x617c, 0x9e84, 0x061c, 0xf9e4,
- 0x0c3c, 0xf3c4, 0x0084, 0xff7c, 0x307c, 0xcf84, 0x030c, 0xfcf4,
- 0x15fc, 0xea04, 0x0164, 0xfe9c, 0x597c, 0xa684, 0x059c, 0xfa64,
- 0x0b3c, 0xf4c4, 0x0068, 0xff98, 0x2c7c, 0xd384, 0x02cc, 0xfd34,
- 0x1dfc, 0xe204, 0x01ec, 0xfe14, 0x797c, 0x8684, 0x07bc, 0xf844,
- 0x0f3c, 0xf0c4, 0x00e4, 0xff1c, 0x3c7c, 0xc384, 0x03dc, 0xfc24,
- 0x11fc, 0xee04, 0x0124, 0xfedc, 0x497c, 0xb684, 0x049c, 0xfb64,
- 0x093c, 0xf6c4, 0x0028, 0xffd8, 0x247c, 0xdb84, 0x024c, 0xfdb4,
- 0x19fc, 0xe604, 0x01ac, 0xfe54, 0x697c, 0x9684, 0x069c, 0xf964,
- 0x0d3c, 0xf2c4, 0x00a4, 0xff5c, 0x347c, 0xcb84, 0x034c, 0xfcb4,
- 0x12fc, 0xed04, 0x0134, 0xfecc, 0x4d7c, 0xb284, 0x04dc, 0xfb24,
- 0x09bc, 0xf644, 0x0038, 0xffc8, 0x267c, 0xd984, 0x026c, 0xfd94,
- 0x1afc, 0xe504, 0x01ac, 0xfe54, 0x6d7c, 0x9284, 0x06dc, 0xf924,
- 0x0dbc, 0xf244, 0x00b4, 0xff4c, 0x367c, 0xc984, 0x036c, 0xfc94,
- 0x0f3c, 0xf0c4, 0x00f4, 0xff0c, 0x3e7c, 0xc184, 0x03dc, 0xfc24,
- 0x07bc, 0xf844, 0x0008, 0xfff8, 0x1efc, 0xe104, 0x01ec, 0xfe14,
- 0x16fc, 0xe904, 0x0174, 0xfe8c, 0x5d7c, 0xa284, 0x05dc, 0xfa24,
- 0x0bbc, 0xf444, 0x0078, 0xff88, 0x2e7c, 0xd184, 0x02ec, 0xfd14,
- 0x14fc, 0xeb04, 0x0154, 0xfeac, 0x557c, 0xaa84, 0x055c, 0xfaa4,
- 0x0abc, 0xf544, 0x0058, 0xffa8, 0x2a7c, 0xd584, 0x02ac, 0xfd54,
- 0x1cfc, 0xe304, 0x01cc, 0xfe34, 0x757c, 0x8a84, 0x075c, 0xf8a4,
- 0x0ebc, 0xf144, 0x00d4, 0xff2c, 0x3a7c, 0xc584, 0x039c, 0xfc64,
- 0x10fc, 0xef04, 0x0114, 0xfeec, 0x457c, 0xba84, 0x045c, 0xfba4,
- 0x08bc, 0xf744, 0x0018, 0xffe8, 0x227c, 0xdd84, 0x022c, 0xfdd4,
- 0x18fc, 0xe704, 0x018c, 0xfe74, 0x657c, 0x9a84, 0x065c, 0xf9a4,
- 0x0cbc, 0xf344, 0x0094, 0xff6c, 0x327c, 0xcd84, 0x032c, 0xfcd4
-};
-
-/* alaw -> ulaw */
-static char isdn_audio_alaw_to_ulaw[] =
-{
- 0xab, 0x2b, 0xe3, 0x63, 0x8b, 0x0b, 0xc9, 0x49,
- 0xba, 0x3a, 0xf6, 0x76, 0x9b, 0x1b, 0xd7, 0x57,
- 0xa3, 0x23, 0xdd, 0x5d, 0x83, 0x03, 0xc1, 0x41,
- 0xb2, 0x32, 0xeb, 0x6b, 0x93, 0x13, 0xcf, 0x4f,
- 0xaf, 0x2f, 0xe7, 0x67, 0x8f, 0x0f, 0xcd, 0x4d,
- 0xbe, 0x3e, 0xfe, 0x7e, 0x9f, 0x1f, 0xdb, 0x5b,
- 0xa7, 0x27, 0xdf, 0x5f, 0x87, 0x07, 0xc5, 0x45,
- 0xb6, 0x36, 0xef, 0x6f, 0x97, 0x17, 0xd3, 0x53,
- 0xa9, 0x29, 0xe1, 0x61, 0x89, 0x09, 0xc7, 0x47,
- 0xb8, 0x38, 0xf2, 0x72, 0x99, 0x19, 0xd5, 0x55,
- 0xa1, 0x21, 0xdc, 0x5c, 0x81, 0x01, 0xbf, 0x3f,
- 0xb0, 0x30, 0xe9, 0x69, 0x91, 0x11, 0xce, 0x4e,
- 0xad, 0x2d, 0xe5, 0x65, 0x8d, 0x0d, 0xcb, 0x4b,
- 0xbc, 0x3c, 0xfa, 0x7a, 0x9d, 0x1d, 0xd9, 0x59,
- 0xa5, 0x25, 0xde, 0x5e, 0x85, 0x05, 0xc3, 0x43,
- 0xb4, 0x34, 0xed, 0x6d, 0x95, 0x15, 0xd1, 0x51,
- 0xac, 0x2c, 0xe4, 0x64, 0x8c, 0x0c, 0xca, 0x4a,
- 0xbb, 0x3b, 0xf8, 0x78, 0x9c, 0x1c, 0xd8, 0x58,
- 0xa4, 0x24, 0xde, 0x5e, 0x84, 0x04, 0xc2, 0x42,
- 0xb3, 0x33, 0xec, 0x6c, 0x94, 0x14, 0xd0, 0x50,
- 0xb0, 0x30, 0xe8, 0x68, 0x90, 0x10, 0xce, 0x4e,
- 0xbf, 0x3f, 0xfe, 0x7e, 0xa0, 0x20, 0xdc, 0x5c,
- 0xa8, 0x28, 0xe0, 0x60, 0x88, 0x08, 0xc6, 0x46,
- 0xb7, 0x37, 0xf0, 0x70, 0x98, 0x18, 0xd4, 0x54,
- 0xaa, 0x2a, 0xe2, 0x62, 0x8a, 0x0a, 0xc8, 0x48,
- 0xb9, 0x39, 0xf4, 0x74, 0x9a, 0x1a, 0xd6, 0x56,
- 0xa2, 0x22, 0xdd, 0x5d, 0x82, 0x02, 0xc0, 0x40,
- 0xb1, 0x31, 0xea, 0x6a, 0x92, 0x12, 0xcf, 0x4f,
- 0xae, 0x2e, 0xe6, 0x66, 0x8e, 0x0e, 0xcc, 0x4c,
- 0xbd, 0x3d, 0xfc, 0x7c, 0x9e, 0x1e, 0xda, 0x5a,
- 0xa6, 0x26, 0xdf, 0x5f, 0x86, 0x06, 0xc4, 0x44,
- 0xb5, 0x35, 0xee, 0x6e, 0x96, 0x16, 0xd2, 0x52
-};
-
-/* ulaw -> alaw */
-static char isdn_audio_ulaw_to_alaw[] =
-{
- 0xab, 0x55, 0xd5, 0x15, 0x95, 0x75, 0xf5, 0x35,
- 0xb5, 0x45, 0xc5, 0x05, 0x85, 0x65, 0xe5, 0x25,
- 0xa5, 0x5d, 0xdd, 0x1d, 0x9d, 0x7d, 0xfd, 0x3d,
- 0xbd, 0x4d, 0xcd, 0x0d, 0x8d, 0x6d, 0xed, 0x2d,
- 0xad, 0x51, 0xd1, 0x11, 0x91, 0x71, 0xf1, 0x31,
- 0xb1, 0x41, 0xc1, 0x01, 0x81, 0x61, 0xe1, 0x21,
- 0x59, 0xd9, 0x19, 0x99, 0x79, 0xf9, 0x39, 0xb9,
- 0x49, 0xc9, 0x09, 0x89, 0x69, 0xe9, 0x29, 0xa9,
- 0xd7, 0x17, 0x97, 0x77, 0xf7, 0x37, 0xb7, 0x47,
- 0xc7, 0x07, 0x87, 0x67, 0xe7, 0x27, 0xa7, 0xdf,
- 0x9f, 0x7f, 0xff, 0x3f, 0xbf, 0x4f, 0xcf, 0x0f,
- 0x8f, 0x6f, 0xef, 0x2f, 0x53, 0x13, 0x73, 0x33,
- 0xb3, 0x43, 0xc3, 0x03, 0x83, 0x63, 0xe3, 0x23,
- 0xa3, 0x5b, 0xdb, 0x1b, 0x9b, 0x7b, 0xfb, 0x3b,
- 0xbb, 0xbb, 0x4b, 0x4b, 0xcb, 0xcb, 0x0b, 0x0b,
- 0x8b, 0x8b, 0x6b, 0x6b, 0xeb, 0xeb, 0x2b, 0x2b,
- 0xab, 0x54, 0xd4, 0x14, 0x94, 0x74, 0xf4, 0x34,
- 0xb4, 0x44, 0xc4, 0x04, 0x84, 0x64, 0xe4, 0x24,
- 0xa4, 0x5c, 0xdc, 0x1c, 0x9c, 0x7c, 0xfc, 0x3c,
- 0xbc, 0x4c, 0xcc, 0x0c, 0x8c, 0x6c, 0xec, 0x2c,
- 0xac, 0x50, 0xd0, 0x10, 0x90, 0x70, 0xf0, 0x30,
- 0xb0, 0x40, 0xc0, 0x00, 0x80, 0x60, 0xe0, 0x20,
- 0x58, 0xd8, 0x18, 0x98, 0x78, 0xf8, 0x38, 0xb8,
- 0x48, 0xc8, 0x08, 0x88, 0x68, 0xe8, 0x28, 0xa8,
- 0xd6, 0x16, 0x96, 0x76, 0xf6, 0x36, 0xb6, 0x46,
- 0xc6, 0x06, 0x86, 0x66, 0xe6, 0x26, 0xa6, 0xde,
- 0x9e, 0x7e, 0xfe, 0x3e, 0xbe, 0x4e, 0xce, 0x0e,
- 0x8e, 0x6e, 0xee, 0x2e, 0x52, 0x12, 0x72, 0x32,
- 0xb2, 0x42, 0xc2, 0x02, 0x82, 0x62, 0xe2, 0x22,
- 0xa2, 0x5a, 0xda, 0x1a, 0x9a, 0x7a, 0xfa, 0x3a,
- 0xba, 0xba, 0x4a, 0x4a, 0xca, 0xca, 0x0a, 0x0a,
- 0x8a, 0x8a, 0x6a, 0x6a, 0xea, 0xea, 0x2a, 0x2a
-};
-
-#define NCOEFF 8 /* number of frequencies to be analyzed */
-#define DTMF_TRESH 4000 /* above this is dtmf */
-#define SILENCE_TRESH 200 /* below this is silence */
-#define AMP_BITS 9 /* bits per sample, reduced to avoid overflow */
-#define LOGRP 0
-#define HIGRP 1
-
-/* For DTMF recognition:
- * 2 * cos(2 * PI * k / N) precalculated for all k
- */
-static int cos2pik[NCOEFF] =
-{
- 55813, 53604, 51193, 48591, 38114, 33057, 25889, 18332
-};
-
-static char dtmf_matrix[4][4] =
-{
- {'1', '2', '3', 'A'},
- {'4', '5', '6', 'B'},
- {'7', '8', '9', 'C'},
- {'*', '0', '#', 'D'}
-};
-
-static inline void
-isdn_audio_tlookup(const u_char *table, u_char *buff, unsigned long n)
-{
-#ifdef __i386__
- unsigned long d0, d1, d2, d3;
- __asm__ __volatile__(
- "cld\n"
- "1:\tlodsb\n\t"
- "xlatb\n\t"
- "stosb\n\t"
- "loop 1b\n\t"
- : "=&b"(d0), "=&c"(d1), "=&D"(d2), "=&S"(d3)
- : "0"((long) table), "1"(n), "2"((long) buff), "3"((long) buff)
- : "memory", "ax");
-#else
- while (n--)
- *buff = table[*(unsigned char *)buff], buff++;
-#endif
-}
-
-void
-isdn_audio_ulaw2alaw(unsigned char *buff, unsigned long len)
-{
- isdn_audio_tlookup(isdn_audio_ulaw_to_alaw, buff, len);
-}
-
-void
-isdn_audio_alaw2ulaw(unsigned char *buff, unsigned long len)
-{
- isdn_audio_tlookup(isdn_audio_alaw_to_ulaw, buff, len);
-}
-
-/*
- * linear <-> adpcm conversion stuff
- * Most parts from the mgetty-package.
- * (C) by Gert Doering and Klaus Weidner
- * Used by permission of Gert Doering
- */
-
-
-#define ZEROTRAP /* turn on the trap as per the MIL-STD */
-#undef ZEROTRAP
-#define BIAS 0x84 /* define the add-in bias for 16 bit samples */
-#define CLIP 32635
-
-static unsigned char
-isdn_audio_linear2ulaw(int sample)
-{
- static int exp_lut[256] =
- {
- 0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3,
- 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
- 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
- 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
- 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
- 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
- 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
- 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
- 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 = 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 = 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/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 = 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 = 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 = 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);
- }
-}
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