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 #define A2DP_SBC_SAMP_FREQ_16000 BIT(7) 30 #define A2DP_SBC_SAMP_FREQ_32000 BIT(6) 31 #define A2DP_SBC_SAMP_FREQ_44100 BIT(5) 32 #define A2DP_SBC_SAMP_FREQ_48000 BIT(4) 33 34 /* Channel Mode */ 35 #define A2DP_SBC_CH_MODE_MONO BIT(3) 36 #define A2DP_SBC_CH_MODE_DUAL BIT(2) 37 #define A2DP_SBC_CH_MODE_STREO BIT(1) 38 #define A2DP_SBC_CH_MODE_JOINT BIT(0) 39 40 /* Block Length */ 41 #define A2DP_SBC_BLK_LEN_4 BIT(7) 42 #define A2DP_SBC_BLK_LEN_8 BIT(6) 43 #define A2DP_SBC_BLK_LEN_12 BIT(5) 44 #define A2DP_SBC_BLK_LEN_16 BIT(4) 45 46 /* Subbands */ 47 #define A2DP_SBC_SUBBAND_4 BIT(3) 48 #define A2DP_SBC_SUBBAND_8 BIT(2) 49 50 /* Allocation Method */ 51 #define A2DP_SBC_ALLOC_MTHD_SNR BIT(1) 52 #define A2DP_SBC_ALLOC_MTHD_LOUDNESS BIT(0) 53 54 #define BT_A2DP_SBC_SAMP_FREQ(cap) ((cap->config[0] >> 4) & 0x0f) 55 #define BT_A2DP_SBC_CHAN_MODE(cap) ((cap->config[0]) & 0x0f) 56 #define BT_A2DP_SBC_BLK_LEN(cap) ((cap->config[1] >> 4) & 0x0f) 57 #define BT_A2DP_SBC_SUB_BAND(cap) ((cap->config[1] >> 2) & 0x03) 58 #define BT_A2DP_SBC_ALLOC_MTHD(cap) ((cap->config[1]) & 0x03) 59 60 /** @brief SBC Codec */ 61 struct bt_a2dp_codec_sbc_params { 62 /** First two octets of configuration */ 63 uint8_t config[2]; 64 /** Minimum Bitpool Value */ 65 uint8_t min_bitpool; 66 /** Maximum Bitpool Value */ 67 uint8_t max_bitpool; 68 } __packed; 69 70 /** If the F bit is set to 0, this field indicates the number of frames contained 71 * in this packet. If the F bit is set to 1, this field indicates the number 72 * of remaining fragments, including the current fragment. 73 * Therefore, the last counter value shall be one. 74 */ 75 #define BT_A2DP_SBC_MEDIA_HDR_NUM_FRAMES_GET(hdr) FIELD_GET(GENMASK(3, 0), (hdr)) 76 /** Set to 1 for the last packet of a fragmented SBC frame, otherwise set to 0. */ 77 #define BT_A2DP_SBC_MEDIA_HDR_L_GET(hdr) FIELD_GET(BIT(5), (hdr)) 78 /** Set to 1 for the starting packet of a fragmented SBC frame, otherwise set to 0. */ 79 #define BT_A2DP_SBC_MEDIA_HDR_S_GET(hdr) FIELD_GET(BIT(6), (hdr)) 80 /** Set to 1 if the SBC frame is fragmented, otherwise set to 0. */ 81 #define BT_A2DP_SBC_MEDIA_HDR_F_GET(hdr) FIELD_GET(BIT(7), (hdr)) 82 83 /** If the F bit is set to 0, this field indicates the number of frames contained 84 * in this packet. If the F bit is set to 1, this field indicates the number 85 * of remaining fragments, including the current fragment. 86 * Therefore, the last counter value shall be one. 87 */ 88 #define BT_A2DP_SBC_MEDIA_HDR_NUM_FRAMES_SET(hdr, val)\ 89 hdr = ((hdr) & ~GENMASK(3, 0)) | FIELD_PREP(GENMASK(3, 0), (val)) 90 /** Set to 1 for the last packet of a fragmented SBC frame, otherwise set to 0. */ 91 #define BT_A2DP_SBC_MEDIA_HDR_L_SET(hdr, val)\ 92 hdr = ((hdr) & ~BIT(5)) | FIELD_PREP(BIT(5), (val)) 93 /** Set to 1 for the starting packet of a fragmented SBC frame, otherwise set to 0. */ 94 #define BT_A2DP_SBC_MEDIA_HDR_S_SET(hdr, val)\ 95 hdr = ((hdr) & ~BIT(6)) | FIELD_PREP(BIT(6), (val)) 96 /** Set to 1 if the SBC frame is fragmented, otherwise set to 0. */ 97 #define BT_A2DP_SBC_MEDIA_HDR_F_SET(hdr, val)\ 98 hdr = ((hdr) & ~BIT(7)) | FIELD_PREP(BIT(7), (val)) 99 100 #define BT_A2DP_SBC_MEDIA_HDR_ENCODE(num_frames, l, s, f)\ 101 FIELD_PREP(GENMASK(3, 0), num_frames) | FIELD_PREP(BIT(5), l) |\ 102 FIELD_PREP(BIT(6), s) | FIELD_PREP(BIT(7), f) 103 104 /** @brief get channel num of a2dp sbc config. 105 * 106 * @param sbc_codec The a2dp sbc parameter. 107 * 108 * @return the channel num. 109 */ 110 uint8_t bt_a2dp_sbc_get_channel_num(struct bt_a2dp_codec_sbc_params *sbc_codec); 111 112 /** @brief get sample rate of a2dp sbc config. 113 * 114 * @param sbc_codec The a2dp sbc parameter. 115 * 116 * @return the sample rate. 117 */ 118 uint32_t bt_a2dp_sbc_get_sampling_frequency(struct bt_a2dp_codec_sbc_params *sbc_codec); 119 120 #ifdef __cplusplus 121 } 122 #endif 123 124 #endif /* ZEPHYR_INCLUDE_BLUETOOTH_A2DP_CODEC_H_ */ 125
