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/* 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, 7, 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 < 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];
}
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