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1 1 : /** @file
2 : * @brief Advance Audio Distribution Profile - SBC Codec header.
3 : */
4 : /*
5 : * SPDX-License-Identifier: Apache-2.0
6 : * Copyright (c) 2015-2016 Intel Corporation
7 : * Copyright (c) 2021 NXP
8 : *
9 : * Licensed under the Apache License, Version 2.0 (the "License");
10 : * you may not use this file except in compliance with the License.
11 : * You may obtain a copy of the License at
12 : *
13 : * http://www.apache.org/licenses/LICENSE-2.0
14 : *
15 : * Unless required by applicable law or agreed to in writing, software
16 : * distributed under the License is distributed on an "AS IS" BASIS,
17 : * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 : * See the License for the specific language governing permissions and
19 : * limitations under the License.
20 : */
21 : #ifndef ZEPHYR_INCLUDE_BLUETOOTH_A2DP_CODEC_H_
22 : #define ZEPHYR_INCLUDE_BLUETOOTH_A2DP_CODEC_H_
23 :
24 : #ifdef __cplusplus
25 : extern "C" {
26 : #endif
27 :
28 : /* Sampling Frequency */
29 0 : #define A2DP_SBC_SAMP_FREQ_16000 BIT(7)
30 0 : #define A2DP_SBC_SAMP_FREQ_32000 BIT(6)
31 0 : #define A2DP_SBC_SAMP_FREQ_44100 BIT(5)
32 0 : #define A2DP_SBC_SAMP_FREQ_48000 BIT(4)
33 :
34 : /* Channel Mode */
35 0 : #define A2DP_SBC_CH_MODE_MONO BIT(3)
36 0 : #define A2DP_SBC_CH_MODE_DUAL BIT(2)
37 0 : #define A2DP_SBC_CH_MODE_STREO BIT(1)
38 0 : #define A2DP_SBC_CH_MODE_JOINT BIT(0)
39 :
40 : /* Block Length */
41 0 : #define A2DP_SBC_BLK_LEN_4 BIT(7)
42 0 : #define A2DP_SBC_BLK_LEN_8 BIT(6)
43 0 : #define A2DP_SBC_BLK_LEN_12 BIT(5)
44 0 : #define A2DP_SBC_BLK_LEN_16 BIT(4)
45 :
46 : /* Subbands */
47 0 : #define A2DP_SBC_SUBBAND_4 BIT(3)
48 0 : #define A2DP_SBC_SUBBAND_8 BIT(2)
49 :
50 : /* Allocation Method */
51 0 : #define A2DP_SBC_ALLOC_MTHD_SNR BIT(1)
52 0 : #define A2DP_SBC_ALLOC_MTHD_LOUDNESS BIT(0)
53 :
54 0 : #define BT_A2DP_SBC_SAMP_FREQ(cap) ((cap->config[0] >> 4) & 0x0f)
55 0 : #define BT_A2DP_SBC_CHAN_MODE(cap) ((cap->config[0]) & 0x0f)
56 0 : #define BT_A2DP_SBC_BLK_LEN(cap) ((cap->config[1] >> 4) & 0x0f)
57 0 : #define BT_A2DP_SBC_SUB_BAND(cap) ((cap->config[1] >> 2) & 0x03)
58 0 : #define BT_A2DP_SBC_ALLOC_MTHD(cap) ((cap->config[1]) & 0x03)
59 0 : #define BT_A2DP_SBC_MIN_BITPOOL_VALUE 2
60 0 : #define BT_A2DP_SBC_MAX_BITPOOL_VALUE 250
61 :
62 : /** @brief SBC Codec */
63 1 : struct bt_a2dp_codec_sbc_params {
64 : /** First two octets of configuration */
65 1 : uint8_t config[2];
66 : /** Minimum Bitpool Value */
67 1 : uint8_t min_bitpool;
68 : /** Maximum Bitpool Value */
69 1 : uint8_t max_bitpool;
70 : } __packed;
71 :
72 : /** If the F bit is set to 0, this field indicates the number of frames contained
73 : * in this packet. If the F bit is set to 1, this field indicates the number
74 : * of remaining fragments, including the current fragment.
75 : * Therefore, the last counter value shall be one.
76 : */
77 1 : #define BT_A2DP_SBC_MEDIA_HDR_NUM_FRAMES_GET(hdr) FIELD_GET(GENMASK(3, 0), (hdr))
78 : /** Set to 1 for the last packet of a fragmented SBC frame, otherwise set to 0. */
79 1 : #define BT_A2DP_SBC_MEDIA_HDR_L_GET(hdr) FIELD_GET(BIT(5), (hdr))
80 : /** Set to 1 for the starting packet of a fragmented SBC frame, otherwise set to 0. */
81 1 : #define BT_A2DP_SBC_MEDIA_HDR_S_GET(hdr) FIELD_GET(BIT(6), (hdr))
82 : /** Set to 1 if the SBC frame is fragmented, otherwise set to 0. */
83 1 : #define BT_A2DP_SBC_MEDIA_HDR_F_GET(hdr) FIELD_GET(BIT(7), (hdr))
84 :
85 : /** If the F bit is set to 0, this field indicates the number of frames contained
86 : * in this packet. If the F bit is set to 1, this field indicates the number
87 : * of remaining fragments, including the current fragment.
88 : * Therefore, the last counter value shall be one.
89 : */
90 1 : #define BT_A2DP_SBC_MEDIA_HDR_NUM_FRAMES_SET(hdr, val)\
91 : hdr = ((hdr) & ~GENMASK(3, 0)) | FIELD_PREP(GENMASK(3, 0), (val))
92 : /** Set to 1 for the last packet of a fragmented SBC frame, otherwise set to 0. */
93 1 : #define BT_A2DP_SBC_MEDIA_HDR_L_SET(hdr, val)\
94 : hdr = ((hdr) & ~BIT(5)) | FIELD_PREP(BIT(5), (val))
95 : /** Set to 1 for the starting packet of a fragmented SBC frame, otherwise set to 0. */
96 1 : #define BT_A2DP_SBC_MEDIA_HDR_S_SET(hdr, val)\
97 : hdr = ((hdr) & ~BIT(6)) | FIELD_PREP(BIT(6), (val))
98 : /** Set to 1 if the SBC frame is fragmented, otherwise set to 0. */
99 1 : #define BT_A2DP_SBC_MEDIA_HDR_F_SET(hdr, val)\
100 : hdr = ((hdr) & ~BIT(7)) | FIELD_PREP(BIT(7), (val))
101 :
102 0 : #define BT_A2DP_SBC_MEDIA_HDR_ENCODE(num_frames, l, s, f)\
103 : FIELD_PREP(GENMASK(3, 0), num_frames) | FIELD_PREP(BIT(5), l) |\
104 : FIELD_PREP(BIT(6), s) | FIELD_PREP(BIT(7), f)
105 :
106 : /** @brief get channel num of a2dp sbc config.
107 : *
108 : * @param sbc_codec The a2dp sbc parameter.
109 : *
110 : * @return the channel num.
111 : */
112 1 : uint8_t bt_a2dp_sbc_get_channel_num(struct bt_a2dp_codec_sbc_params *sbc_codec);
113 :
114 : /** @brief get sample rate of a2dp sbc config.
115 : *
116 : * @param sbc_codec The a2dp sbc parameter.
117 : *
118 : * @return the sample rate.
119 : */
120 1 : uint32_t bt_a2dp_sbc_get_sampling_frequency(struct bt_a2dp_codec_sbc_params *sbc_codec);
121 :
122 : #ifdef __cplusplus
123 : }
124 : #endif
125 :
126 : #endif /* ZEPHYR_INCLUDE_BLUETOOTH_A2DP_CODEC_H_ */
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