2005-04-16 18:20:36 -04:00
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/* $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 cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 04:04:11 -04:00
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#include <linux/slab.h>
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2005-04-16 18:20:36 -04:00
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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,
|
|
|
|
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)
|
2006-12-13 03:35:56 -05:00
|
|
|
s = kmalloc(sizeof(adpcm_state), GFP_ATOMIC);
|
2005-04-16 18:20:36 -04:00
|
|
|
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)
|
2006-12-13 03:35:56 -05:00
|
|
|
s = kmalloc(sizeof(dtmf_state), GFP_ATOMIC);
|
2005-04-16 18:20:36 -04:00
|
|
|
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)
|
2006-12-13 03:35:56 -05:00
|
|
|
s = kmalloc(sizeof(silence_state), GFP_ATOMIC);
|
2005-04-16 18:20:36 -04:00
|
|
|
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);
|
|
|
|
}
|
|
|
|
}
|