1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
|
/* GSM 06.90 - GSM AMR Codec */
/*
* (C) 2010 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* 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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <osmocom/core/utils.h>
#include <osmocom/codec/codec.h>
/*
* These table map between the raw encoder parameter output and
* the format used before channel coding. Both in GSM and in various
* file/network format (same tables used in several specs).
*/
/* AMR 12.2 kbits - subjective importance bit ordering */
/* This array encodes GSM 05.03 Table 7
* It's also TS 26.101 Table B.8
*/
const uint16_t gsm690_12_2_bitorder[244] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 23, 15, 16, 17, 18,
19, 20, 21, 22, 24, 25, 26, 27, 28, 38,
141, 39, 142, 40, 143, 41, 144, 42, 145, 43,
146, 44, 147, 45, 148, 46, 149, 47, 97, 150,
200, 48, 98, 151, 201, 49, 99, 152, 202, 86,
136, 189, 239, 87, 137, 190, 240, 88, 138, 191,
241, 91, 194, 92, 195, 93, 196, 94, 197, 95,
198, 29, 30, 31, 32, 33, 34, 35, 50, 100,
153, 203, 89, 139, 192, 242, 51, 101, 154, 204,
55, 105, 158, 208, 90, 140, 193, 243, 59, 109,
162, 212, 63, 113, 166, 216, 67, 117, 170, 220,
36, 37, 54, 53, 52, 58, 57, 56, 62, 61,
60, 66, 65, 64, 70, 69, 68, 104, 103, 102,
108, 107, 106, 112, 111, 110, 116, 115, 114, 120,
119, 118, 157, 156, 155, 161, 160, 159, 165, 164,
163, 169, 168, 167, 173, 172, 171, 207, 206, 205,
211, 210, 209, 215, 214, 213, 219, 218, 217, 223,
222, 221, 73, 72, 71, 76, 75, 74, 79, 78,
77, 82, 81, 80, 85, 84, 83, 123, 122, 121,
126, 125, 124, 129, 128, 127, 132, 131, 130, 135,
134, 133, 176, 175, 174, 179, 178, 177, 182, 181,
180, 185, 184, 183, 188, 187, 186, 226, 225, 224,
229, 228, 227, 232, 231, 230, 235, 234, 233, 238,
237, 236, 96, 199,
};
/* AMR 10.2 kbits - subjective importance bit ordering */
/* This array encodes GSM 05.03 Table 8
* It's also TS 26.101 Table B.7
*/
const uint16_t gsm690_10_2_bitorder[204] = {
7, 6, 5, 4, 3, 2, 1, 0, 16, 15,
14, 13, 12, 11, 10, 9, 8, 26, 27, 28,
29, 30, 31, 115, 116, 117, 118, 119, 120, 72,
73, 161, 162, 65, 68, 69, 108, 111, 112, 154,
157, 158, 197, 200, 201, 32, 33, 121, 122, 74,
75, 163, 164, 66, 109, 155, 198, 19, 23, 21,
22, 18, 17, 20, 24, 25, 37, 36, 35, 34,
80, 79, 78, 77, 126, 125, 124, 123, 169, 168,
167, 166, 70, 67, 71, 113, 110, 114, 159, 156,
160, 202, 199, 203, 76, 165, 81, 82, 92, 91,
93, 83, 95, 85, 84, 94, 101, 102, 96, 104,
86, 103, 87, 97, 127, 128, 138, 137, 139, 129,
141, 131, 130, 140, 147, 148, 142, 150, 132, 149,
133, 143, 170, 171, 181, 180, 182, 172, 184, 174,
173, 183, 190, 191, 185, 193, 175, 192, 176, 186,
38, 39, 49, 48, 50, 40, 52, 42, 41, 51,
58, 59, 53, 61, 43, 60, 44, 54, 194, 179,
189, 196, 177, 195, 178, 187, 188, 151, 136, 146,
153, 134, 152, 135, 144, 145, 105, 90, 100, 107,
88, 106, 89, 98, 99, 62, 47, 57, 64, 45,
63, 46, 55, 56,
};
/* AMR 7.95 kbits - subjective importance bit ordering */
/* This array encodes GSM 05.03 Table 9
* It's also TS 26.101 Table B.6
*/
const uint16_t gsm690_7_95_bitorder[159] = {
8, 7, 6, 5, 4, 3, 2, 14, 16, 9,
10, 12, 13, 15, 11, 17, 20, 22, 24, 23,
19, 18, 21, 56, 88, 122, 154, 57, 89, 123,
155, 58, 90, 124, 156, 52, 84, 118, 150, 53,
85, 119, 151, 27, 93, 28, 94, 29, 95, 30,
96, 31, 97, 61, 127, 62, 128, 63, 129, 59,
91, 125, 157, 32, 98, 64, 130, 1, 0, 25,
26, 33, 99, 34, 100, 65, 131, 66, 132, 54,
86, 120, 152, 60, 92, 126, 158, 55, 87, 121,
153, 117, 116, 115, 46, 78, 112, 144, 43, 75,
109, 141, 40, 72, 106, 138, 36, 68, 102, 134,
114, 149, 148, 147, 146, 83, 82, 81, 80, 51,
50, 49, 48, 47, 45, 44, 42, 39, 35, 79,
77, 76, 74, 71, 67, 113, 111, 110, 108, 105,
101, 145, 143, 142, 140, 137, 133, 41, 73, 107,
139, 37, 69, 103, 135, 38, 70, 104, 136,
};
/* AMR 7.4 kbits - subjective importance bit ordering */
/* This array encodes GSM 05.03 Table 10
* It's also TS 26.101 Table B.5
*/
const uint16_t gsm690_7_4_bitorder[148] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15, 16, 26, 87, 27,
88, 28, 89, 29, 90, 30, 91, 51, 80, 112,
141, 52, 81, 113, 142, 54, 83, 115, 144, 55,
84, 116, 145, 58, 119, 59, 120, 21, 22, 23,
17, 18, 19, 31, 60, 92, 121, 56, 85, 117,
146, 20, 24, 25, 50, 79, 111, 140, 57, 86,
118, 147, 49, 78, 110, 139, 48, 77, 53, 82,
114, 143, 109, 138, 47, 76, 108, 137, 32, 33,
61, 62, 93, 94, 122, 123, 41, 42, 43, 44,
45, 46, 70, 71, 72, 73, 74, 75, 102, 103,
104, 105, 106, 107, 131, 132, 133, 134, 135, 136,
34, 63, 95, 124, 35, 64, 96, 125, 36, 65,
97, 126, 37, 66, 98, 127, 38, 67, 99, 128,
39, 68, 100, 129, 40, 69, 101, 130,
};
/* AMR 6.7 kbits - subjective importance bit ordering */
/* This array encodes GSM 05.03 Table 11
* It's also TS 26.101 Table B.4
*/
const uint16_t gsm690_6_7_bitorder[134] = {
0, 1, 4, 3, 5, 6, 13, 7, 2, 8,
9, 11, 15, 12, 14, 10, 28, 82, 29, 83,
27, 81, 26, 80, 30, 84, 16, 55, 109, 56,
110, 31, 85, 57, 111, 48, 73, 102, 127, 32,
86, 51, 76, 105, 130, 52, 77, 106, 131, 58,
112, 33, 87, 19, 23, 53, 78, 107, 132, 21,
22, 18, 17, 20, 24, 25, 50, 75, 104, 129,
47, 72, 101, 126, 54, 79, 108, 133, 46, 71,
100, 125, 128, 103, 74, 49, 45, 70, 99, 124,
42, 67, 96, 121, 39, 64, 93, 118, 38, 63,
92, 117, 35, 60, 89, 114, 34, 59, 88, 113,
44, 69, 98, 123, 43, 68, 97, 122, 41, 66,
95, 120, 40, 65, 94, 119, 37, 62, 91, 116,
36, 61, 90, 115,
};
/* AMR 5.9 kbits - subjective importance bit ordering */
/* This array encodes GSM 05.03 Table 12
* It's also TS 26.101 Table B.3
*/
const uint16_t gsm690_5_9_bitorder[118] = {
0, 1, 4, 5, 3, 6, 7, 2, 13, 15,
8, 9, 11, 12, 14, 10, 16, 28, 74, 29,
75, 27, 73, 26, 72, 30, 76, 51, 97, 50,
71, 96, 117, 31, 77, 52, 98, 49, 70, 95,
116, 53, 99, 32, 78, 33, 79, 48, 69, 94,
115, 47, 68, 93, 114, 46, 67, 92, 113, 19,
21, 23, 22, 18, 17, 20, 24, 111, 43, 89,
110, 64, 65, 44, 90, 25, 45, 66, 91, 112,
54, 100, 40, 61, 86, 107, 39, 60, 85, 106,
36, 57, 82, 103, 35, 56, 81, 102, 34, 55,
80, 101, 42, 63, 88, 109, 41, 62, 87, 108,
38, 59, 84, 105, 37, 58, 83, 104,
};
/* AMR 5.15 kbits - subjective importance bit ordering */
/* This array encodes GSM 05.03 Table 13
* It's also TS 26.101 Table B.2
*/
const uint16_t gsm690_5_15_bitorder[103] = {
7, 6, 5, 4, 3, 2, 1, 0, 15, 14,
13, 12, 11, 10, 9, 8, 23, 24, 25, 26,
27, 46, 65, 84, 45, 44, 43, 64, 63, 62,
83, 82, 81, 102, 101, 100, 42, 61, 80, 99,
28, 47, 66, 85, 18, 41, 60, 79, 98, 29,
48, 67, 17, 20, 22, 40, 59, 78, 97, 21,
30, 49, 68, 86, 19, 16, 87, 39, 38, 58,
57, 77, 35, 54, 73, 92, 76, 96, 95, 36,
55, 74, 93, 32, 51, 33, 52, 70, 71, 89,
90, 31, 50, 69, 88, 37, 56, 75, 94, 34,
53, 72, 91,
};
/* AMR 4.75 kbits - subjective importance bit ordering */
/* This array encodes GSM 05.03 Table 14
* It's also TS 26.101 Table B.1
*/
const uint16_t gsm690_4_75_bitorder[95] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15, 23, 24, 25, 26,
27, 28, 48, 49, 61, 62, 82, 83, 47, 46,
45, 44, 81, 80, 79, 78, 17, 18, 20, 22,
77, 76, 75, 74, 29, 30, 43, 42, 41, 40,
38, 39, 16, 19, 21, 50, 51, 59, 60, 63,
64, 72, 73, 84, 85, 93, 94, 32, 33, 35,
36, 53, 54, 56, 57, 66, 67, 69, 70, 87,
88, 90, 91, 34, 55, 68, 89, 37, 58, 71,
92, 31, 52, 65, 86,
};
static const uint8_t amr_len_by_ft[16] = {
12, 13, 15, 17, 19, 20, 26, 31, 0, 0, 0, 0, 0, 0, 0, 0
};
const struct value_string osmo_amr_type_names[] = {
{ AMR_4_75, "AMR 4,75 kbits/s" },
{ AMR_5_15, "AMR 5,15 kbit/s" },
{ AMR_5_90, "AMR 5,90 kbit/s" },
{ AMR_6_70, "AMR 6,70 kbit/s (PDC-EFR)" },
{ AMR_7_40, "AMR 7,40 kbit/s (TDMA-EFR)" },
{ AMR_7_95, "AMR 7,95 kbit/s" },
{ AMR_10_2, "AMR 10,2 kbit/s" },
{ AMR_12_2, "AMR 12,2 kbit/s (GSM-EFR)" },
{ AMR_SID, "AMR SID" },
{ AMR_GSM_EFR_SID, "GSM-EFR SID" },
{ AMR_TDMA_EFR_SID, "TDMA-EFR SID" },
{ AMR_PDC_EFR_SID, "PDC-EFR SID" },
{ AMR_NO_DATA, "No Data/NA" },
{ 0, NULL },
};
/*! \brief Decode various AMR parameters from RTP payload (RFC 4867) acording to
* 3GPP TS 26.101
* \param[in] rtppayload Payload from RTP packet
* \param[in] payload_len length of rtppayload
* \param[out] cmr AMR Codec Mode Request, not filled if NULL
* \param[out] cmi AMR Codec Mode Indicator, -1 if not applicable for this type,
* not filled if NULL
* \param[out] ft AMR Frame Type, not filled if NULL
* \param[out] bfi AMR Bad Frame Indicator, not filled if NULL
* \param[out] sti AMR SID Type Indicator, -1 if not applicable for this type,
* not filled if NULL
* \returns length of AMR data or negative value on error
*/
int osmo_amr_rtp_dec(const uint8_t *rtppayload, int payload_len, uint8_t *cmr,
int8_t *cmi, enum osmo_amr_type *ft,
enum osmo_amr_quality *bfi, int8_t *sti)
{
if (payload_len < 2 || !rtppayload)
return -EINVAL;
/* RFC 4867 § 4.4.2 ToC - compound payloads are not supported: F = 0 */
uint8_t type = (rtppayload[1] >> 3) & 0xf;
/* compound payloads are not supported */
if (rtppayload[1] >> 7)
return -ENOTSUP;
if (payload_len - 2 < amr_len_by_ft[type])
return -ENOTSUP;
if (ft)
*ft = type;
if (cmr)
*cmr = rtppayload[0] >> 4;
if (bfi)
*bfi = (rtppayload[1] >> 2) & 1;
/* Table 6 in 3GPP TS 26.101 */
if (cmi)
*cmi = (type == AMR_SID) ? ((rtppayload[6] >> 1) & 7) : -1;
if (sti)
*sti = (type == AMR_SID) ? (rtppayload[6] & 0x10) : -1;
return 2 + amr_len_by_ft[type];
}
/*! \brief Encode various AMR parameters from RTP payload (RFC 4867)
* \param[out] payload Payload for RTP packet, contains speech data (if any)
* except for have 2 first bytes where header will be built
* \param[in] cmr AMR codec Mode Request
* \param[in] ft AMR Frame Type
* \param[in] bfi AMR Bad Frame Indicator
* \returns length of AMR data (header + ToC + speech data) or negative value
* on error
*
* Note: only octet-aligned mode is supported so the header occupies 2 full
* bytes. Optional interleaving header is not supported.
*/
int osmo_amr_rtp_enc(uint8_t *payload, uint8_t cmr, enum osmo_amr_type ft,
enum osmo_amr_quality bfi)
{
if (cmr > 15)
return -EINVAL;
if (ft > 15)
return -ENOTSUP;
/* RFC 4867 § 4.3.1 payload header */
payload[0] = cmr << 4;
/* RFC 4867 § 4.4.2 ToC - compound payloads are not supported: F = 0 */
payload[1] = (((uint8_t)ft) << 3) | (((uint8_t)bfi) << 2);
/* speech data */
return 2 + amr_len_by_ft[ft];
}
|
