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/*! \file gsm610.c
* GSM 06.10 - GSM FR codec. */
/*
* (C) 2010 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* SPDX-License-Identifier: GPL-2.0+
*
* 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 of the License, 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <stdint.h>
#include <stdbool.h>
#include <osmocom/core/bitvec.h>
#include <osmocom/core/utils.h>
#include <osmocom/codec/codec.h>
/* GSM FR - subjective importance bit ordering */
/* This array encodes GSM 05.03 Table 2.
* It's also GSM 06.10 Table A.2.1a
*
* It converts between serial parameter output by the encoder and the
* order needed before channel encoding.
*/
const uint16_t gsm610_bitorder[260] = {
0, /* LARc0:5 */
47, /* Xmaxc0:5 */
103, /* Xmaxc1:5 */
159, /* Xmaxc2:5 */
215, /* Xmaxc3:5 */
1, /* LARc0:4 */
6, /* LARc1:5 */
12, /* LARc2:4 */
2, /* LARc0:3 */
7, /* LARc1:4 */
13, /* LARc2:3 */
17, /* LARc3:4 */
36, /* Nc0:6 */
92, /* Nc1:6 */
148, /* Nc2:6 */
204, /* Nc3:6 */
48, /* Xmaxc0:4 */
104, /* Xmaxc1:4 */
160, /* Xmaxc2:4 */
216, /* Xmaxc3:4 */
8, /* LARc1:3 */
22, /* LARc4:3 */
26, /* LARc5:3 */
37, /* Nc0:5 */
93, /* Nc1:5 */
149, /* Nc2:5 */
205, /* Nc3:5 */
38, /* Nc0:4 */
94, /* Nc1:4 */
150, /* Nc2:4 */
206, /* Nc3:4 */
39, /* Nc0:3 */
95, /* Nc1:3 */
151, /* Nc2:3 */
207, /* Nc3:3 */
40, /* Nc0:2 */
96, /* Nc1:2 */
152, /* Nc2:2 */
208, /* Nc3:2 */
49, /* Xmaxc0:3 */
105, /* Xmaxc1:3 */
161, /* Xmaxc2:3 */
217, /* Xmaxc3:3 */
3, /* LARc0:2 */
18, /* LARc3:3 */
30, /* LARc6:2 */
41, /* Nc0:1 */
97, /* Nc1:1 */
153, /* Nc2:1 */
209, /* Nc3:1 */
23, /* LARc4:2 */
27, /* LARc5:2 */
43, /* bc0:1 */
99, /* bc1:1 */
155, /* bc2:1 */
211, /* bc3:1 */
42, /* Nc0:0 */
98, /* Nc1:0 */
154, /* Nc2:0 */
210, /* Nc3:0 */
45, /* Mc0:1 */
101, /* Mc1:1 */
157, /* Mc2:1 */
213, /* Mc3:1 */
4, /* LARc0:1 */
9, /* LARc1:2 */
14, /* LARc2:2 */
33, /* LARc7:2 */
19, /* LARc3:2 */
24, /* LARc4:1 */
31, /* LARc6:1 */
44, /* bc0:0 */
100, /* bc1:0 */
156, /* bc2:0 */
212, /* bc3:0 */
50, /* Xmaxc0:2 */
106, /* Xmaxc1:2 */
162, /* Xmaxc2:2 */
218, /* Xmaxc3:2 */
53, /* xmc0_0:2 */
56, /* xmc0_1:2 */
59, /* xmc0_2:2 */
62, /* xmc0_3:2 */
65, /* xmc0_4:2 */
68, /* xmc0_5:2 */
71, /* xmc0_6:2 */
74, /* xmc0_7:2 */
77, /* xmc0_8:2 */
80, /* xmc0_9:2 */
83, /* xmc0_10:2 */
86, /* xmc0_11:2 */
89, /* xmc0_12:2 */
109, /* xmc1_0:2 */
112, /* xmc1_1:2 */
115, /* xmc1_2:2 */
118, /* xmc1_3:2 */
121, /* xmc1_4:2 */
124, /* xmc1_5:2 */
127, /* xmc1_6:2 */
130, /* xmc1_7:2 */
133, /* xmc1_8:2 */
136, /* xmc1_9:2 */
139, /* xmc1_10:2 */
142, /* xmc1_11:2 */
145, /* xmc1_12:2 */
165, /* xmc2_0:2 */
168, /* xmc2_1:2 */
171, /* xmc2_2:2 */
174, /* xmc2_3:2 */
177, /* xmc2_4:2 */
180, /* xmc2_5:2 */
183, /* xmc2_6:2 */
186, /* xmc2_7:2 */
189, /* xmc2_8:2 */
192, /* xmc2_9:2 */
195, /* xmc2_10:2 */
198, /* xmc2_11:2 */
201, /* xmc2_12:2 */
221, /* xmc3_0:2 */
224, /* xmc3_1:2 */
227, /* xmc3_2:2 */
230, /* xmc3_3:2 */
233, /* xmc3_4:2 */
236, /* xmc3_5:2 */
239, /* xmc3_6:2 */
242, /* xmc3_7:2 */
245, /* xmc3_8:2 */
248, /* xmc3_9:2 */
251, /* xmc3_10:2 */
254, /* xmc3_11:2 */
257, /* xmc3_12:2 */
46, /* Mc0:0 */
102, /* Mc1:0 */
158, /* Mc2:0 */
214, /* Mc3:0 */
51, /* Xmaxc0:1 */
107, /* Xmaxc1:1 */
163, /* Xmaxc2:1 */
219, /* Xmaxc3:1 */
54, /* xmc0_0:1 */
57, /* xmc0_1:1 */
60, /* xmc0_2:1 */
63, /* xmc0_3:1 */
66, /* xmc0_4:1 */
69, /* xmc0_5:1 */
72, /* xmc0_6:1 */
75, /* xmc0_7:1 */
78, /* xmc0_8:1 */
81, /* xmc0_9:1 */
84, /* xmc0_10:1 */
87, /* xmc0_11:1 */
90, /* xmc0_12:1 */
110, /* xmc1_0:1 */
113, /* xmc1_1:1 */
116, /* xmc1_2:1 */
119, /* xmc1_3:1 */
122, /* xmc1_4:1 */
125, /* xmc1_5:1 */
128, /* xmc1_6:1 */
131, /* xmc1_7:1 */
134, /* xmc1_8:1 */
137, /* xmc1_9:1 */
140, /* xmc1_10:1 */
143, /* xmc1_11:1 */
146, /* xmc1_12:1 */
166, /* xmc2_0:1 */
169, /* xmc2_1:1 */
172, /* xmc2_2:1 */
175, /* xmc2_3:1 */
178, /* xmc2_4:1 */
181, /* xmc2_5:1 */
184, /* xmc2_6:1 */
187, /* xmc2_7:1 */
190, /* xmc2_8:1 */
193, /* xmc2_9:1 */
196, /* xmc2_10:1 */
199, /* xmc2_11:1 */
202, /* xmc2_12:1 */
222, /* xmc3_0:1 */
225, /* xmc3_1:1 */
228, /* xmc3_2:1 */
231, /* xmc3_3:1 */
234, /* xmc3_4:1 */
237, /* xmc3_5:1 */
240, /* xmc3_6:1 */
243, /* xmc3_7:1 */
246, /* xmc3_8:1 */
249, /* xmc3_9:1 */
252, /* xmc3_10:1 */
255, /* xmc3_11:1 */
258, /* xmc3_12:1 */
5, /* LARc0:0 */
10, /* LARc1:1 */
15, /* LARc2:1 */
28, /* LARc5:1 */
32, /* LARc6:0 */
34, /* LARc7:1 */
35, /* LARc7:0 */
16, /* LARc2:0 */
20, /* LARc3:1 */
21, /* LARc3:0 */
25, /* LARc4:0 */
52, /* Xmaxc0:0 */
108, /* Xmaxc1:0 */
164, /* Xmaxc2:0 */
220, /* Xmaxc3:0 */
55, /* xmc0_0:0 */
58, /* xmc0_1:0 */
61, /* xmc0_2:0 */
64, /* xmc0_3:0 */
67, /* xmc0_4:0 */
70, /* xmc0_5:0 */
73, /* xmc0_6:0 */
76, /* xmc0_7:0 */
79, /* xmc0_8:0 */
82, /* xmc0_9:0 */
85, /* xmc0_10:0 */
88, /* xmc0_11:0 */
91, /* xmc0_12:0 */
111, /* xmc1_0:0 */
114, /* xmc1_1:0 */
117, /* xmc1_2:0 */
120, /* xmc1_3:0 */
123, /* xmc1_4:0 */
126, /* xmc1_5:0 */
129, /* xmc1_6:0 */
132, /* xmc1_7:0 */
135, /* xmc1_8:0 */
138, /* xmc1_9:0 */
141, /* xmc1_10:0 */
144, /* xmc1_11:0 */
147, /* xmc1_12:0 */
167, /* xmc2_0:0 */
170, /* xmc2_1:0 */
173, /* xmc2_2:0 */
176, /* xmc2_3:0 */
179, /* xmc2_4:0 */
182, /* xmc2_5:0 */
185, /* xmc2_6:0 */
188, /* xmc2_7:0 */
191, /* xmc2_8:0 */
194, /* xmc2_9:0 */
197, /* xmc2_10:0 */
200, /* xmc2_11:0 */
203, /* xmc2_12:0 */
223, /* xmc3_0:0 */
226, /* xmc3_1:0 */
229, /* xmc3_2:0 */
232, /* xmc3_3:0 */
235, /* xmc3_4:0 */
238, /* xmc3_5:0 */
241, /* xmc3_6:0 */
244, /* xmc3_7:0 */
247, /* xmc3_8:0 */
250, /* xmc3_9:0 */
253, /* xmc3_10:0 */
256, /* xmc3_11:0 */
259, /* xmc3_12:0 */
11, /* LARc1:0 */
29, /* LARc5:0 */
};
/*! Check whether RTP frame contains FR SID code word according to
* TS 101 318 §5.1.2
* \param[in] rtp_payload Buffer with RTP payload
* \param[in] payload_len Length of payload
* \returns true if code word is found, false otherwise
*/
bool osmo_fr_check_sid(const uint8_t *rtp_payload, size_t payload_len)
{
struct bitvec bv;
uint16_t i, z_bits[] = { 57, 58, 60, 61, 63, 64, 66, 67, 69, 70, 72, 73,
75, 76, 78, 79, 81, 82, 84, 85, 87, 88, 90, 91,
93, 94, 113, 114, 116, 117, 119, 120, 122, 123,
125, 126, 128, 129, 131, 132, 134, 135, 137,
138, 140, 141, 143, 144, 146, 147, 149, 150,
169, 170, 172, 173, 175, 176, 178, 179, 181,
182, 184, 185, 187, 188, 190, 191, 193, 194,
196, 197, 199, 200, 202, 203, 205, 206, 225,
226, 228, 229, 231, 232, 234, 235, 237, 240,
243, 246, 249, 252, 255, 258, 261 };
/* signature does not match Full Rate SID */
if ((rtp_payload[0] >> 4) != 0xD)
return false;
bv.data = (uint8_t *) rtp_payload;
bv.data_len = payload_len;
/* code word is all 0 at given bits, numbered from 1 */
for (i = 0; i < ARRAY_SIZE(z_bits); i++)
if (bitvec_get_bit_pos(&bv, z_bits[i]) != ZERO)
return false;
return true;
}
|
