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linux/drivers/isdn/mISDN/l1oip_codec.c

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 153 Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 675 mass ave cambridge ma 02139 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 77 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Armijn Hemel <armijn@tjaldur.nl> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.837555891@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-27 08:55:02 +02:00
// SPDX-License-Identifier: GPL-2.0-or-later
Add layer1 over IP support Implement a ISDN over IP tunnel to use mISDN hardware on remote locations. Signed-off-by: Karsten Keil <kkeil@suse.de>
2008-07-27 02:02:10 +02:00
/*
* l1oip_codec.c generic codec using lookup table
* -> conversion from a-Law to u-Law
* -> conversion from u-Law to a-Law
* -> compression by reducing the number of sample resolution to 4
*
* NOTE: It is not compatible with any standard codec like ADPCM.
*
* Author Andreas Eversberg (jolly@eversberg.eu)
*
*/
/*
isdn: whitespace coding style cleanup isdn source code uses a not-current coding style. Update the coding style used on a per-line basis so that git diff -w shows only elided blank lines at EOF. Done with emacs and some scripts and some typing. Built x86 allyesconfig. No detected change in objdump -d or size. Signed-off-by: Joe Perches <joe@perches.com>
2012-02-19 19:52:38 -08:00
How the codec works:
--------------------
Add layer1 over IP support Implement a ISDN over IP tunnel to use mISDN hardware on remote locations. Signed-off-by: Karsten Keil <kkeil@suse.de>
2008-07-27 02:02:10 +02:00
isdn: whitespace coding style cleanup isdn source code uses a not-current coding style. Update the coding style used on a per-line basis so that git diff -w shows only elided blank lines at EOF. Done with emacs and some scripts and some typing. Built x86 allyesconfig. No detected change in objdump -d or size. Signed-off-by: Joe Perches <joe@perches.com>
2012-02-19 19:52:38 -08:00
The volume is increased to increase the dynamic range of the audio signal.
Each sample is converted to a-LAW with only 16 steps of level resolution.
A pair of two samples are stored in one byte.
Add layer1 over IP support Implement a ISDN over IP tunnel to use mISDN hardware on remote locations. Signed-off-by: Karsten Keil <kkeil@suse.de>
2008-07-27 02:02:10 +02:00
isdn: whitespace coding style cleanup isdn source code uses a not-current coding style. Update the coding style used on a per-line basis so that git diff -w shows only elided blank lines at EOF. Done with emacs and some scripts and some typing. Built x86 allyesconfig. No detected change in objdump -d or size. Signed-off-by: Joe Perches <joe@perches.com>
2012-02-19 19:52:38 -08:00
The first byte is stored in the upper bits, the second byte is stored in the
lower bits.
Add layer1 over IP support Implement a ISDN over IP tunnel to use mISDN hardware on remote locations. Signed-off-by: Karsten Keil <kkeil@suse.de>
2008-07-27 02:02:10 +02:00
isdn: whitespace coding style cleanup isdn source code uses a not-current coding style. Update the coding style used on a per-line basis so that git diff -w shows only elided blank lines at EOF. Done with emacs and some scripts and some typing. Built x86 allyesconfig. No detected change in objdump -d or size. Signed-off-by: Joe Perches <joe@perches.com>
2012-02-19 19:52:38 -08:00
To speed up compression and decompression, two lookup tables are formed:
Add layer1 over IP support Implement a ISDN over IP tunnel to use mISDN hardware on remote locations. Signed-off-by: Karsten Keil <kkeil@suse.de>
2008-07-27 02:02:10 +02:00
isdn: whitespace coding style cleanup isdn source code uses a not-current coding style. Update the coding style used on a per-line basis so that git diff -w shows only elided blank lines at EOF. Done with emacs and some scripts and some typing. Built x86 allyesconfig. No detected change in objdump -d or size. Signed-off-by: Joe Perches <joe@perches.com>
2012-02-19 19:52:38 -08:00
- 16 bits index for two samples (law encoded) with 8 bit compressed result.
- 8 bits index for one compressed data with 16 bits decompressed result.
Add layer1 over IP support Implement a ISDN over IP tunnel to use mISDN hardware on remote locations. Signed-off-by: Karsten Keil <kkeil@suse.de>
2008-07-27 02:02:10 +02:00
isdn: whitespace coding style cleanup isdn source code uses a not-current coding style. Update the coding style used on a per-line basis so that git diff -w shows only elided blank lines at EOF. Done with emacs and some scripts and some typing. Built x86 allyesconfig. No detected change in objdump -d or size. Signed-off-by: Joe Perches <joe@perches.com>
2012-02-19 19:52:38 -08:00
NOTE: The bytes are handled as they are law-encoded.
Add layer1 over IP support Implement a ISDN over IP tunnel to use mISDN hardware on remote locations. Signed-off-by: Karsten Keil <kkeil@suse.de>
2008-07-27 02:02:10 +02:00
*/
#include <linux/vmalloc.h>
#include <linux/mISDNif.h>
mISDN: DSP now uses ring buffer for echo canceler DSP now uses ring buffer for echo canceler. Added missing include in l1oip_codec.c Signed-off-by: Andreas Eversberg <andreas@eversberg.eu> Signed-off-by: Karsten Keil <keil@b1-systems.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-22 11:04:45 +00:00
#include <linux/in.h>
Add layer1 over IP support Implement a ISDN over IP tunnel to use mISDN hardware on remote locations. Signed-off-by: Karsten Keil <kkeil@suse.de>
2008-07-27 02:02:10 +02:00
#include "core.h"
mISDN: make global symbols static or include header files The warnings fixed by including an header file for the appropriate prototype are marked with "*", for all others the corresonponding symbol has been made static. This patch fixes all such issues in mISDN. Fix this sparse warnings: drivers/isdn/hardware/mISDN/hfcmulti.c:174:5: warning: symbol 'plxsd_master' was not declared. Should it be static? drivers/isdn/hardware/mISDN/hfcmulti.c:426:1: warning: symbol 'write_fifo_regio' was not declared. Should it be static? drivers/isdn/hardware/mISDN/hfcmulti.c:447:1: warning: symbol 'write_fifo_pcimem' was not declared. Should it be static? drivers/isdn/hardware/mISDN/hfcmulti.c:469:1: warning: symbol 'read_fifo_regio' was not declared. Should it be static? drivers/isdn/hardware/mISDN/hfcmulti.c:491:1: warning: symbol 'read_fifo_pcimem' was not declared. Should it be static? drivers/isdn/hardware/mISDN/hfcmulti.c:710:1: warning: symbol 'vpm_init' was not declared. Should it be static? drivers/isdn/hardware/mISDN/hfcmulti.c:793:1: warning: symbol 'vpm_check' was not declared. Should it be static? drivers/isdn/hardware/mISDN/hfcmulti.c:816:1: warning: symbol 'vpm_echocan_on' was not declared. Should it be static? drivers/isdn/hardware/mISDN/hfcmulti.c:848:1: warning: symbol 'vpm_echocan_off' was not declared. Should it be static? * drivers/isdn/mISDN/l1oip_codec.c:224:1: warning: symbol 'l1oip_law_to_4bit' was not declared. Should it be static? * drivers/isdn/mISDN/l1oip_codec.c:261:1: warning: symbol 'l1oip_4bit_to_law' was not declared. Should it be static? * drivers/isdn/mISDN/l1oip_codec.c:281:1: warning: symbol 'l1oip_alaw_to_ulaw' was not declared. Should it be static? * drivers/isdn/mISDN/l1oip_codec.c:294:1: warning: symbol 'l1oip_ulaw_to_alaw' was not declared. Should it be static? * drivers/isdn/mISDN/l1oip_codec.c:311:1: warning: symbol 'l1oip_4bit_free' was not declared. Should it be static? * drivers/isdn/mISDN/l1oip_codec.c:322:1: warning: symbol 'l1oip_4bit_alloc' was not declared. Should it be static? drivers/isdn/mISDN/core.c:29:1: warning: symbol 'device_lock' was not declared. Should it be static? drivers/isdn/mISDN/core.c:34:1: warning: symbol 'bp_lock' was not declared. Should it be static? drivers/isdn/mISDN/core.c:196:1: warning: symbol 'mISDNInit' was not declared. Should it be static? drivers/isdn/mISDN/core.c:227:6: warning: symbol 'mISDN_cleanup' was not declared. Should it be static? drivers/isdn/mISDN/stack.c:40:1: warning: symbol 'mISDN_queue_message' was not declared. Should it be static? * drivers/isdn/mISDN/layer1.c:388:1: warning: symbol 'l1_init' was not declared. Should it be static? * drivers/isdn/mISDN/layer1.c:400:1: warning: symbol 'l1_cleanup' was not declared. Should it be static? drivers/isdn/mISDN/layer2.c:469:1: warning: symbol 'iframe_error' was not declared. Should it be static? drivers/isdn/mISDN/layer2.c:487:1: warning: symbol 'super_error' was not declared. Should it be static? drivers/isdn/mISDN/layer2.c:496:1: warning: symbol 'unnum_error' was not declared. Should it be static? drivers/isdn/mISDN/layer2.c:509:1: warning: symbol 'UI_error' was not declared. Should it be static? drivers/isdn/mISDN/layer2.c:522:1: warning: symbol 'FRMR_error' was not declared. Should it be static? drivers/isdn/mISDN/layer2.c:1069:1: warning: symbol 'enquiry_cr' was not declared. Should it be static? * drivers/isdn/mISDN/layer2.c:2196:1: warning: symbol 'Isdnl2_Init' was not declared. Should it be static? * drivers/isdn/mISDN/layer2.c:2210:1: warning: symbol 'Isdnl2_cleanup' was not declared. Should it be static? drivers/isdn/mISDN/tei.c:397:1: warning: symbol 'random_ri' was not declared. Should it be static? * drivers/isdn/mISDN/timerdev.c:277:1: warning: symbol 'mISDN_inittimer' was not declared. Should it be static? * drivers/isdn/mISDN/timerdev.c:288:6: warning: symbol 'mISDN_timer_cleanup' was not declared. Should it be static? drivers/isdn/mISDN/dsp_core.c:164:12: warning: symbol 'mISDN_dsp_revision' was not declared. Should it be static? drivers/isdn/mISDN/dsp_cmx.c:1543:5: warning: symbol 'samplecount' was not declared. Should it be static? drivers/isdn/mISDN/dsp_cmx.c:1546:5: warning: symbol 'dsp_start_jiffies' was not declared. Should it be static? drivers/isdn/mISDN/dsp_cmx.c:1547:16: warning: symbol 'dsp_start_tv' was not declared. Should it be static? drivers/isdn/mISDN/dsp_tones.c:239:3: warning: symbol 'pattern' was not declared. Should it be static? drivers/isdn/mISDN/dsp_audio.c:33:4: warning: symbol 'dsp_audio_ulaw_to_alaw' was not declared. Should it be static? Signed-off-by: Hannes Eder <hannes@hanneseder.net> Acked-by: Karsten Keil <kkeil@suse.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-12-12 21:15:17 -08:00
#include "l1oip.h"
Add layer1 over IP support Implement a ISDN over IP tunnel to use mISDN hardware on remote locations. Signed-off-by: Karsten Keil <kkeil@suse.de>
2008-07-27 02:02:10 +02:00
/* definitions of codec. don't use calculations, code may run slower. */
static u8 *table_com;
static u16 *table_dec;
/* alaw -> ulaw */
static u8 alaw_to_ulaw[256] =
{
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 u8 ulaw_to_alaw[256] =
{
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
};
/* alaw -> 4bit compression */
static u8 alaw_to_4bit[256] = {
0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
0x0d, 0x02, 0x08, 0x07, 0x0f, 0x00, 0x0b, 0x04,
0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
0x0d, 0x02, 0x09, 0x06, 0x0f, 0x00, 0x0b, 0x04,
0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
0x0d, 0x02, 0x08, 0x07, 0x0f, 0x00, 0x0b, 0x04,
0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
0x0d, 0x02, 0x09, 0x06, 0x0f, 0x00, 0x0b, 0x04,
0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
0x0d, 0x02, 0x08, 0x07, 0x0f, 0x00, 0x0b, 0x04,
0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0d, 0x02,
0x0e, 0x02, 0x09, 0x06, 0x0f, 0x00, 0x0b, 0x04,
0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
0x0d, 0x02, 0x08, 0x07, 0x0f, 0x00, 0x0b, 0x04,
0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
0x0d, 0x02, 0x09, 0x06, 0x0f, 0x00, 0x0b, 0x04,
0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
0x0d, 0x02, 0x08, 0x07, 0x0f, 0x00, 0x0b, 0x04,
0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
0x0d, 0x02, 0x09, 0x06, 0x0f, 0x00, 0x0b, 0x04,
0x0e, 0x02, 0x09, 0x06, 0x0f, 0x00, 0x0b, 0x04,
0x0d, 0x02, 0x08, 0x07, 0x0f, 0x01, 0x0a, 0x05,
0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
0x0d, 0x02, 0x09, 0x07, 0x0f, 0x00, 0x0b, 0x04,
0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
0x0d, 0x02, 0x08, 0x07, 0x0f, 0x00, 0x0b, 0x04,
0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
0x0d, 0x02, 0x09, 0x06, 0x0f, 0x00, 0x0b, 0x04,
0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
0x0d, 0x02, 0x08, 0x07, 0x0f, 0x00, 0x0b, 0x04,
0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
0x0d, 0x02, 0x09, 0x06, 0x0f, 0x00, 0x0b, 0x04,
};
/* 4bit -> alaw decompression */
static u8 _4bit_to_alaw[16] = {
0x5d, 0x51, 0xd9, 0xd7, 0x5f, 0x53, 0xa3, 0x4b,
0x2a, 0x3a, 0x22, 0x2e, 0x26, 0x56, 0x20, 0x2c,
};
/* ulaw -> 4bit compression */
static u8 ulaw_to_4bit[256] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x04, 0x04,
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
0x04, 0x04, 0x04, 0x04, 0x05, 0x05, 0x05, 0x05,
0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x08,
0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
0x0f, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e,
0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e,
0x0e, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d,
0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d,
0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c,
0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0b, 0x0b,
0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
0x0b, 0x0b, 0x0b, 0x0b, 0x0a, 0x0a, 0x0a, 0x0a,
0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a,
0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09,
0x09, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
};
/* 4bit -> ulaw decompression */
static u8 _4bit_to_ulaw[16] = {
0x11, 0x21, 0x31, 0x40, 0x4e, 0x5c, 0x68, 0x71,
0xfe, 0xef, 0xe7, 0xdb, 0xcd, 0xbf, 0xaf, 0x9f,
};
/*
* Compresses data to the result buffer
* The result size must be at least half of the input buffer.
* The number of samples also must be even!
*/
int
l1oip_law_to_4bit(u8 *data, int len, u8 *result, u32 *state)
{
int ii, i = 0, o = 0;
if (!len)
return 0;
/* send saved byte and first input byte */
if (*state) {
isdn: whitespace coding style cleanup isdn source code uses a not-current coding style. Update the coding style used on a per-line basis so that git diff -w shows only elided blank lines at EOF. Done with emacs and some scripts and some typing. Built x86 allyesconfig. No detected change in objdump -d or size. Signed-off-by: Joe Perches <joe@perches.com>
2012-02-19 19:52:38 -08:00
*result++ = table_com[(((*state) << 8) & 0xff00) | (*data++)];
Add layer1 over IP support Implement a ISDN over IP tunnel to use mISDN hardware on remote locations. Signed-off-by: Karsten Keil <kkeil@suse.de>
2008-07-27 02:02:10 +02:00
len--;
o++;
}
ii = len >> 1;
while (i < ii) {
*result++ = table_com[(data[0]<<8) | (data[1])];
data += 2;
i++;
o++;
}
/* if len has an odd number, we save byte for next call */
if (len & 1)
*state = 0x100 + *data;
else
*state = 0;
return o;
}
/* Decompress data to the result buffer
* The result size must be the number of sample in packet. (2 * input data)
* The number of samples in the result are even!
*/
int
l1oip_4bit_to_law(u8 *data, int len, u8 *result)
{
int i = 0;
u16 r;
while (i < len) {
r = table_dec[*data++];
isdn: whitespace coding style cleanup isdn source code uses a not-current coding style. Update the coding style used on a per-line basis so that git diff -w shows only elided blank lines at EOF. Done with emacs and some scripts and some typing. Built x86 allyesconfig. No detected change in objdump -d or size. Signed-off-by: Joe Perches <joe@perches.com>
2012-02-19 19:52:38 -08:00
*result++ = r >> 8;
Add layer1 over IP support Implement a ISDN over IP tunnel to use mISDN hardware on remote locations. Signed-off-by: Karsten Keil <kkeil@suse.de>
2008-07-27 02:02:10 +02:00
*result++ = r;
i++;
}
return len << 1;
}
/*
* law conversion
*/
int
l1oip_alaw_to_ulaw(u8 *data, int len, u8 *result)
{
int i = 0;
while (i < len) {
*result++ = alaw_to_ulaw[*data++];
i++;
}
return len;
}
int
l1oip_ulaw_to_alaw(u8 *data, int len, u8 *result)
{
int i = 0;
while (i < len) {
*result++ = ulaw_to_alaw[*data++];
i++;
}
return len;
}
/*
* generate/free compression and decompression table
*/
void
l1oip_4bit_free(void)
{
mISDN: Deletion of unnecessary checks before the function call "vfree" The vfree() function performs also input parameter validation. Thus the test around the call is not needed. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2014-11-19 20:48:26 +01:00
vfree(table_dec);
vfree(table_com);
Add layer1 over IP support Implement a ISDN over IP tunnel to use mISDN hardware on remote locations. Signed-off-by: Karsten Keil <kkeil@suse.de>
2008-07-27 02:02:10 +02:00
table_com = NULL;
table_dec = NULL;
}
int
l1oip_4bit_alloc(int ulaw)
{
int i1, i2, c, sample;
/* in case, it is called again */
if (table_dec)
return 0;
/* alloc conversion tables */
isdn: Convert vmalloc/memset to vzalloc Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2011-05-28 10:36:26 -07:00
table_com = vzalloc(65536);
table_dec = vzalloc(512);
trivial: Fix dubious bitwise 'or' usage spotted by sparse. It doesn't change the semantics, but it looks like the logical 'or' was meant to be used here. Signed-off-by: Alexey Zaytsev <alexey.zaytsev@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-01-10 02:48:05 +03:00
if (!table_com || !table_dec) {
Add layer1 over IP support Implement a ISDN over IP tunnel to use mISDN hardware on remote locations. Signed-off-by: Karsten Keil <kkeil@suse.de>
2008-07-27 02:02:10 +02:00
l1oip_4bit_free();
return -ENOMEM;
}
/* generate compression table */
i1 = 0;
while (i1 < 256) {
if (ulaw)
c = ulaw_to_4bit[i1];
else
c = alaw_to_4bit[i1];
i2 = 0;
while (i2 < 256) {
isdn: whitespace coding style cleanup isdn source code uses a not-current coding style. Update the coding style used on a per-line basis so that git diff -w shows only elided blank lines at EOF. Done with emacs and some scripts and some typing. Built x86 allyesconfig. No detected change in objdump -d or size. Signed-off-by: Joe Perches <joe@perches.com>
2012-02-19 19:52:38 -08:00
table_com[(i1 << 8) | i2] |= (c << 4);
table_com[(i2 << 8) | i1] |= c;
Add layer1 over IP support Implement a ISDN over IP tunnel to use mISDN hardware on remote locations. Signed-off-by: Karsten Keil <kkeil@suse.de>
2008-07-27 02:02:10 +02:00
i2++;
}
i1++;
}
/* generate decompression table */
i1 = 0;
while (i1 < 16) {
if (ulaw)
sample = _4bit_to_ulaw[i1];
else
sample = _4bit_to_alaw[i1];
i2 = 0;
while (i2 < 16) {
isdn: whitespace coding style cleanup isdn source code uses a not-current coding style. Update the coding style used on a per-line basis so that git diff -w shows only elided blank lines at EOF. Done with emacs and some scripts and some typing. Built x86 allyesconfig. No detected change in objdump -d or size. Signed-off-by: Joe Perches <joe@perches.com>
2012-02-19 19:52:38 -08:00
table_dec[(i1 << 4) | i2] |= (sample << 8);
table_dec[(i2 << 4) | i1] |= sample;
Add layer1 over IP support Implement a ISDN over IP tunnel to use mISDN hardware on remote locations. Signed-off-by: Karsten Keil <kkeil@suse.de>
2008-07-27 02:02:10 +02:00
i2++;
}
i1++;
}
return 0;
}
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