Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * l1oip_codec.c  generic codec using lookup table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *  -> conversion from a-Law to u-Law
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *  -> conversion from u-Law to a-Law
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *  -> compression by reducing the number of sample resolution to 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * NOTE: It is not compatible with any standard codec like ADPCM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * Author	Andreas Eversberg (jolly@eversberg.eu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)   How the codec works:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)   --------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)   The volume is increased to increase the dynamic range of the audio signal.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)   Each sample is converted to a-LAW with only 16 steps of level resolution.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)   A pair of two samples are stored in one byte.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)   The first byte is stored in the upper bits, the second byte is stored in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)   lower bits.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28)   To speed up compression and decompression, two lookup tables are formed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)   - 16 bits index for two samples (law encoded) with 8 bit compressed result.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)   - 8 bits index for one compressed data with 16 bits decompressed result.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33)   NOTE: The bytes are handled as they are law-encoded.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #include <linux/mISDNif.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #include <linux/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #include "core.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #include "l1oip.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) /* definitions of codec. don't use calculations, code may run slower. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) static u8 *table_com;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) static u16 *table_dec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) /* alaw -> ulaw */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) static u8 alaw_to_ulaw[256] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	0xab, 0x2b, 0xe3, 0x63, 0x8b, 0x0b, 0xc9, 0x49,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	0xba, 0x3a, 0xf6, 0x76, 0x9b, 0x1b, 0xd7, 0x57,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	0xa3, 0x23, 0xdd, 0x5d, 0x83, 0x03, 0xc1, 0x41,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	0xb2, 0x32, 0xeb, 0x6b, 0x93, 0x13, 0xcf, 0x4f,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	0xaf, 0x2f, 0xe7, 0x67, 0x8f, 0x0f, 0xcd, 0x4d,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	0xbe, 0x3e, 0xfe, 0x7e, 0x9f, 0x1f, 0xdb, 0x5b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	0xa7, 0x27, 0xdf, 0x5f, 0x87, 0x07, 0xc5, 0x45,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	0xb6, 0x36, 0xef, 0x6f, 0x97, 0x17, 0xd3, 0x53,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	0xa9, 0x29, 0xe1, 0x61, 0x89, 0x09, 0xc7, 0x47,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	0xb8, 0x38, 0xf2, 0x72, 0x99, 0x19, 0xd5, 0x55,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	0xa1, 0x21, 0xdc, 0x5c, 0x81, 0x01, 0xbf, 0x3f,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	0xb0, 0x30, 0xe9, 0x69, 0x91, 0x11, 0xce, 0x4e,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	0xad, 0x2d, 0xe5, 0x65, 0x8d, 0x0d, 0xcb, 0x4b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	0xbc, 0x3c, 0xfa, 0x7a, 0x9d, 0x1d, 0xd9, 0x59,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	0xa5, 0x25, 0xde, 0x5e, 0x85, 0x05, 0xc3, 0x43,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	0xb4, 0x34, 0xed, 0x6d, 0x95, 0x15, 0xd1, 0x51,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	0xac, 0x2c, 0xe4, 0x64, 0x8c, 0x0c, 0xca, 0x4a,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	0xbb, 0x3b, 0xf8, 0x78, 0x9c, 0x1c, 0xd8, 0x58,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	0xa4, 0x24, 0xde, 0x5e, 0x84, 0x04, 0xc2, 0x42,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	0xb3, 0x33, 0xec, 0x6c, 0x94, 0x14, 0xd0, 0x50,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	0xb0, 0x30, 0xe8, 0x68, 0x90, 0x10, 0xce, 0x4e,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	0xbf, 0x3f, 0xfe, 0x7e, 0xa0, 0x20, 0xdc, 0x5c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	0xa8, 0x28, 0xe0, 0x60, 0x88, 0x08, 0xc6, 0x46,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	0xb7, 0x37, 0xf0, 0x70, 0x98, 0x18, 0xd4, 0x54,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	0xaa, 0x2a, 0xe2, 0x62, 0x8a, 0x0a, 0xc8, 0x48,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	0xb9, 0x39, 0xf4, 0x74, 0x9a, 0x1a, 0xd6, 0x56,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	0xa2, 0x22, 0xdd, 0x5d, 0x82, 0x02, 0xc0, 0x40,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	0xb1, 0x31, 0xea, 0x6a, 0x92, 0x12, 0xcf, 0x4f,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	0xae, 0x2e, 0xe6, 0x66, 0x8e, 0x0e, 0xcc, 0x4c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	0xbd, 0x3d, 0xfc, 0x7c, 0x9e, 0x1e, 0xda, 0x5a,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	0xa6, 0x26, 0xdf, 0x5f, 0x86, 0x06, 0xc4, 0x44,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	0xb5, 0x35, 0xee, 0x6e, 0x96, 0x16, 0xd2, 0x52
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) /* ulaw -> alaw */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) static u8 ulaw_to_alaw[256] =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	0xab, 0x55, 0xd5, 0x15, 0x95, 0x75, 0xf5, 0x35,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	0xb5, 0x45, 0xc5, 0x05, 0x85, 0x65, 0xe5, 0x25,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	0xa5, 0x5d, 0xdd, 0x1d, 0x9d, 0x7d, 0xfd, 0x3d,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	0xbd, 0x4d, 0xcd, 0x0d, 0x8d, 0x6d, 0xed, 0x2d,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	0xad, 0x51, 0xd1, 0x11, 0x91, 0x71, 0xf1, 0x31,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	0xb1, 0x41, 0xc1, 0x01, 0x81, 0x61, 0xe1, 0x21,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	0x59, 0xd9, 0x19, 0x99, 0x79, 0xf9, 0x39, 0xb9,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	0x49, 0xc9, 0x09, 0x89, 0x69, 0xe9, 0x29, 0xa9,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	0xd7, 0x17, 0x97, 0x77, 0xf7, 0x37, 0xb7, 0x47,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	0xc7, 0x07, 0x87, 0x67, 0xe7, 0x27, 0xa7, 0xdf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	0x9f, 0x7f, 0xff, 0x3f, 0xbf, 0x4f, 0xcf, 0x0f,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	0x8f, 0x6f, 0xef, 0x2f, 0x53, 0x13, 0x73, 0x33,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	0xb3, 0x43, 0xc3, 0x03, 0x83, 0x63, 0xe3, 0x23,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	0xa3, 0x5b, 0xdb, 0x1b, 0x9b, 0x7b, 0xfb, 0x3b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	0xbb, 0xbb, 0x4b, 0x4b, 0xcb, 0xcb, 0x0b, 0x0b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	0x8b, 0x8b, 0x6b, 0x6b, 0xeb, 0xeb, 0x2b, 0x2b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	0xab, 0x54, 0xd4, 0x14, 0x94, 0x74, 0xf4, 0x34,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	0xb4, 0x44, 0xc4, 0x04, 0x84, 0x64, 0xe4, 0x24,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	0xa4, 0x5c, 0xdc, 0x1c, 0x9c, 0x7c, 0xfc, 0x3c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	0xbc, 0x4c, 0xcc, 0x0c, 0x8c, 0x6c, 0xec, 0x2c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	0xac, 0x50, 0xd0, 0x10, 0x90, 0x70, 0xf0, 0x30,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	0xb0, 0x40, 0xc0, 0x00, 0x80, 0x60, 0xe0, 0x20,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	0x58, 0xd8, 0x18, 0x98, 0x78, 0xf8, 0x38, 0xb8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	0x48, 0xc8, 0x08, 0x88, 0x68, 0xe8, 0x28, 0xa8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	0xd6, 0x16, 0x96, 0x76, 0xf6, 0x36, 0xb6, 0x46,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	0xc6, 0x06, 0x86, 0x66, 0xe6, 0x26, 0xa6, 0xde,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	0x9e, 0x7e, 0xfe, 0x3e, 0xbe, 0x4e, 0xce, 0x0e,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	0x8e, 0x6e, 0xee, 0x2e, 0x52, 0x12, 0x72, 0x32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	0xb2, 0x42, 0xc2, 0x02, 0x82, 0x62, 0xe2, 0x22,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	0xa2, 0x5a, 0xda, 0x1a, 0x9a, 0x7a, 0xfa, 0x3a,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	0xba, 0xba, 0x4a, 0x4a, 0xca, 0xca, 0x0a, 0x0a,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	0x8a, 0x8a, 0x6a, 0x6a, 0xea, 0xea, 0x2a, 0x2a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) /* alaw -> 4bit compression */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static u8 alaw_to_4bit[256] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	0x0d, 0x02, 0x08, 0x07, 0x0f, 0x00, 0x0b, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	0x0d, 0x02, 0x09, 0x06, 0x0f, 0x00, 0x0b, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	0x0d, 0x02, 0x08, 0x07, 0x0f, 0x00, 0x0b, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	0x0d, 0x02, 0x09, 0x06, 0x0f, 0x00, 0x0b, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	0x0d, 0x02, 0x08, 0x07, 0x0f, 0x00, 0x0b, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0d, 0x02,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	0x0e, 0x02, 0x09, 0x06, 0x0f, 0x00, 0x0b, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	0x0d, 0x02, 0x08, 0x07, 0x0f, 0x00, 0x0b, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	0x0d, 0x02, 0x09, 0x06, 0x0f, 0x00, 0x0b, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	0x0d, 0x02, 0x08, 0x07, 0x0f, 0x00, 0x0b, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	0x0d, 0x02, 0x09, 0x06, 0x0f, 0x00, 0x0b, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	0x0e, 0x02, 0x09, 0x06, 0x0f, 0x00, 0x0b, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	0x0d, 0x02, 0x08, 0x07, 0x0f, 0x01, 0x0a, 0x05,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	0x0d, 0x02, 0x09, 0x07, 0x0f, 0x00, 0x0b, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	0x0d, 0x02, 0x08, 0x07, 0x0f, 0x00, 0x0b, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	0x0d, 0x02, 0x09, 0x06, 0x0f, 0x00, 0x0b, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	0x0d, 0x02, 0x08, 0x07, 0x0f, 0x00, 0x0b, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	0x0e, 0x01, 0x0a, 0x05, 0x0f, 0x00, 0x0c, 0x03,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	0x0d, 0x02, 0x09, 0x06, 0x0f, 0x00, 0x0b, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /* 4bit -> alaw decompression */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) static u8 _4bit_to_alaw[16] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	0x5d, 0x51, 0xd9, 0xd7, 0x5f, 0x53, 0xa3, 0x4b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	0x2a, 0x3a, 0x22, 0x2e, 0x26, 0x56, 0x20, 0x2c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) /* ulaw -> 4bit compression */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static u8 ulaw_to_4bit[256] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x04, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	0x04, 0x04, 0x04, 0x04, 0x05, 0x05, 0x05, 0x05,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x08,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f, 0x0f,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	0x0f, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e, 0x0e,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	0x0e, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d, 0x0d,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0b, 0x0b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	0x0b, 0x0b, 0x0b, 0x0b, 0x0a, 0x0a, 0x0a, 0x0a,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	0x09, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) /* 4bit -> ulaw decompression */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) static u8 _4bit_to_ulaw[16] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	0x11, 0x21, 0x31, 0x40, 0x4e, 0x5c, 0x68, 0x71,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	0xfe, 0xef, 0xe7, 0xdb, 0xcd, 0xbf, 0xaf, 0x9f,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)  * Compresses data to the result buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)  * The result size must be at least half of the input buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)  * The number of samples also must be even!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) l1oip_law_to_4bit(u8 *data, int len, u8 *result, u32 *state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	int ii, i = 0, o = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	if (!len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	/* send saved byte and first input byte */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	if (*state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		*result++ = table_com[(((*state) << 8) & 0xff00) | (*data++)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		len--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		o++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	ii = len >> 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	while (i < ii) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		*result++ = table_com[(data[0]<<8) | (data[1])];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		data += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		i++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		o++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	/* if len has an odd number, we save byte for next call */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	if (len & 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		*state = 0x100 + *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		*state = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	return o;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) /* Decompress data to the result buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)  * The result size must be the number of sample in packet. (2 * input data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)  * The number of samples in the result are even!
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) l1oip_4bit_to_law(u8 *data, int len, u8 *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	int i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	u16 r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	while (i < len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		r = table_dec[*data++];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		*result++ = r >> 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		*result++ = r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		i++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	return len << 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)  * law conversion
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) l1oip_alaw_to_ulaw(u8 *data, int len, u8 *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	int i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	while (i < len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		*result++ = alaw_to_ulaw[*data++];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		i++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) l1oip_ulaw_to_alaw(u8 *data, int len, u8 *result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	int i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	while (i < len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		*result++ = ulaw_to_alaw[*data++];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		i++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)  * generate/free compression and decompression table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) l1oip_4bit_free(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	vfree(table_dec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	vfree(table_com);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	table_com = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	table_dec = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) l1oip_4bit_alloc(int ulaw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	int i1, i2, c, sample;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	/* in case, it is called again */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	if (table_dec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	/* alloc conversion tables */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	table_com = vzalloc(65536);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	table_dec = vzalloc(512);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	if (!table_com || !table_dec) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		l1oip_4bit_free();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	/* generate compression table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	i1 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	while (i1 < 256) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		if (ulaw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 			c = ulaw_to_4bit[i1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 			c = alaw_to_4bit[i1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 		i2 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		while (i2 < 256) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 			table_com[(i1 << 8) | i2] |= (c << 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 			table_com[(i2 << 8) | i1] |= c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 			i2++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		i1++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	/* generate decompression table */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	i1 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	while (i1 < 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		if (ulaw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 			sample = _4bit_to_ulaw[i1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 			sample = _4bit_to_alaw[i1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		i2 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		while (i2 < 16) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 			table_dec[(i1 << 4) | i2] |= (sample << 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 			table_dec[(i2 << 4) | i1] |= sample;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 			i2++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		i1++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }