bluetooth/a2dp/1.0/types.hal

/*
 * Copyright (C) 2018 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.hardware.bluetooth.a2dp@1.0;

enum Status : uint8_t {
    SUCCESS,
    FAILURE,
    /** codec configuration not supported by the audio platform */
    UNSUPPORTED_CODEC_CONFIGURATION ,
    /** operation is pending */
    PENDING,
};

enum CodecType : uint32_t {
    UNKNOWN = 0x00,
    SBC = 0x01,
    AAC = 0x02,
    APTX = 0x04,
    APTX_HD = 0x08,
    LDAC = 0x10,
};
enum SampleRate : uint32_t {
    RATE_UNKNOWN = 0x00,
    RATE_44100 = 0x01,
    RATE_48000 = 0x02,
    RATE_88200 = 0x04,
    RATE_96000 = 0x08,
    RATE_176400 = 0x10,
    RATE_192000 = 0x20,
};
enum BitsPerSample : uint8_t {
    BITS_UNKNOWN = 0x00,
    BITS_16 = 0x01,
    BITS_24 = 0x02,
    BITS_32 = 0x04,
};
enum ChannelMode : uint8_t {
    UNKNOWN = 0x00,
    MONO = 0x01,
    STEREO = 0x02,
};
struct CodecConfiguration {
    /** Bluetooth A2DP codec */
    CodecType codecType;
    /** Sampling rate for encoder */
    SampleRate sampleRate;
    /** Bits per sample for encoder */
    BitsPerSample bitsPerSample;
    /** Channel mode for encoder */
    ChannelMode channelMode;
    /**
     * The encoded audio bitrate in bits / second.
     * 0x00000000 - The audio bitrate is not specified / unused
     * 0x00000001 - 0x00FFFFFF - Encoded audio bitrate in bits/second
     * 0x01000000 - 0xFFFFFFFF - Reserved
     */
    uint32_t encodedAudioBitrate;
    /** Peer MTU (in octets) */
    uint16_t peerMtu;
    union CodecSpecific {
        /**
         * SBC Codec specific information
         * Refer to SBC Codec specific information elements in A2DP v1.3
         * Profile Specification.
         */
        struct SbcData {
            /** Block length: 4 bits | Subbands: 2 bits | Allocation Method: 2 bits */
            uint8_t codecParameters;
            /** Minimum bitpool value */
            uint8_t minBitpool;
            /** Maximum bitpool value */
            uint8_t maxBitpool;
        } sbcData;
        struct LdacData {
            /**
             * LDAC bitrate index value:
             * 0x00 - High
             * 0x01 - Mid
             * 0x02 - Low
             * 0x7F - ABR (Adaptive Bit Rate)
             */
            uint8_t bitrateIndex;
        } ldacData;
    } codecSpecific;
};