1 /* 2 * Copyright 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <iostream> 20 21 #include "hardware/avrcp/avrcp_common.h" 22 #include "hardware/avrcp/avrcp_logging_helper.h" 23 #include "packet/base/iterator.h" 24 #include "packet/base/packet.h" 25 #include "packet/base/packet_builder.h" 26 27 namespace bluetooth { 28 namespace avrcp { 29 30 class PacketBuilder : public ::bluetooth::PacketBuilder { 31 public: 32 virtual ~PacketBuilder() = default; 33 34 static std::unique_ptr<PacketBuilder> MakeBuilder( 35 CType cType, uint8_t subunit_type, uint8_t subunit_id, Opcode opcode, 36 std::unique_ptr<::bluetooth::PacketBuilder> packet); 37 38 virtual size_t size() const override; 39 virtual bool Serialize(const std::shared_ptr<::bluetooth::Packet>& pkt) override; 40 41 protected: 42 CType c_type_; 43 uint8_t subunit_type_ : 5; 44 uint8_t subunit_id_ : 3; 45 Opcode opcode_; 46 std::unique_ptr<::bluetooth::PacketBuilder> payload_; 47 48 void PushHeader(const std::shared_ptr<::bluetooth::Packet>& pkt); 49 bool PushCompanyId(const std::shared_ptr<::bluetooth::Packet>& pkt, uint32_t company_id); 50 PacketBuilder(CType type,uint8_t subunit_type,uint8_t subunit_id,Opcode opcode)51 PacketBuilder(CType type, uint8_t subunit_type, uint8_t subunit_id, Opcode opcode) 52 : c_type_(type), subunit_type_(subunit_type), subunit_id_(subunit_id), opcode_(opcode) {} 53 }; 54 55 class Packet : public ::bluetooth::Packet { 56 public: 57 Packet(const Packet&) = delete; 58 Packet& operator=(const Packet&) = delete; 59 60 virtual ~Packet() = default; 61 62 // TODO (apanicke): Right now we can use this to build an AvrcpPacket from 63 // another packet type. In the future, we can remove this in favor of 64 // getting an AVRCP Packet directly from an AVCTP Packet 65 static std::shared_ptr<Packet> Parse(std::shared_ptr<::bluetooth::Packet> pkt); 66 67 /** 68 * Avrcp Packet Layout 69 * CType c_type_; 70 * uint8_t subunit_type_ : 5; 71 * uint8_t subunit_id_ : 3; 72 * Opcode opcode_; 73 * uint8_t[] payload_; 74 */ kMinSize()75 static constexpr size_t kMinSize() { return 3; } 76 77 // Getter Functions 78 CType GetCType() const; 79 uint8_t GetSubunitType() const; 80 uint8_t GetSubunitId() const; 81 Opcode GetOpcode() const; 82 83 // Overloaded Functions 84 virtual bool IsValid() const override; 85 virtual std::string ToString() const override; 86 87 protected: 88 using ::bluetooth::Packet::Packet; 89 PullCompanyId(Iterator it)90 static inline uint32_t PullCompanyId(Iterator it) { 91 uint32_t value = 0; 92 for (int i = 0; i < 3; i++) { 93 value <<= 8; 94 value |= *it++; 95 } 96 return value; 97 } 98 99 private: 100 virtual std::pair<size_t, size_t> GetPayloadIndecies() const override; 101 }; 102 103 } // namespace avrcp 104 } // namespace bluetooth 105