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 <base/logging.h> 20 #include <iostream> 21 22 #include "hardware/avrcp/avrcp_common.h" 23 #include "hardware/avrcp/avrcp_logging_helper.h" 24 #include "packet/base/iterator.h" 25 #include "packet/base/packet.h" 26 #include "packet/base/packet_builder.h" 27 28 namespace bluetooth { 29 namespace avrcp { 30 31 class PacketBuilder : public ::bluetooth::PacketBuilder { 32 public: 33 virtual ~PacketBuilder() = default; 34 35 static std::unique_ptr<PacketBuilder> MakeBuilder( 36 CType cType, uint8_t subunit_type, uint8_t subunit_id, Opcode opcode, 37 std::unique_ptr<::bluetooth::PacketBuilder> packet); 38 39 virtual size_t size() const override; 40 virtual bool Serialize( 41 const std::shared_ptr<::bluetooth::Packet>& pkt) override; 42 43 protected: 44 CType c_type_; 45 uint8_t subunit_type_ : 5; 46 uint8_t subunit_id_ : 3; 47 Opcode opcode_; 48 std::unique_ptr<::bluetooth::PacketBuilder> payload_; 49 50 void PushHeader(const std::shared_ptr<::bluetooth::Packet>& pkt); 51 bool PushCompanyId(const std::shared_ptr<::bluetooth::Packet>& pkt, 52 uint32_t company_id); 53 PacketBuilder(CType type,uint8_t subunit_type,uint8_t subunit_id,Opcode opcode)54 PacketBuilder(CType type, uint8_t subunit_type, uint8_t subunit_id, 55 Opcode opcode) 56 : c_type_(type), 57 subunit_type_(subunit_type), 58 subunit_id_(subunit_id), 59 opcode_(opcode){}; 60 }; 61 62 class Packet : public ::bluetooth::Packet { 63 public: 64 Packet(const Packet&) = delete; 65 Packet& operator=(const Packet&) = delete; 66 67 virtual ~Packet() = default; 68 69 // TODO (apanicke): Right now we can use this to build an AvrcpPacket from 70 // another packet type. In the future, we can remove this in favor of 71 // getting an AVRCP Packet directly from an AVCTP Packet 72 static std::shared_ptr<Packet> Parse( 73 std::shared_ptr<::bluetooth::Packet> pkt); 74 75 /** 76 * Avrcp Packet Layout 77 * CType c_type_; 78 * uint8_t subunit_type_ : 5; 79 * uint8_t subunit_id_ : 3; 80 * Opcode opcode_; 81 * uint8_t[] payload_; 82 */ kMinSize()83 static constexpr size_t kMinSize() { return 3; }; 84 85 // Getter Functions 86 CType GetCType() const; 87 uint8_t GetSubunitType() const; 88 uint8_t GetSubunitId() const; 89 Opcode GetOpcode() const; 90 91 // Overloaded Functions 92 virtual bool IsValid() const override; 93 virtual std::string ToString() const override; 94 95 protected: 96 using ::bluetooth::Packet::Packet; 97 PullCompanyId(Iterator it)98 static inline uint32_t PullCompanyId(Iterator it) { 99 uint32_t value = 0; 100 for (int i = 0; i < 3; i++) { 101 value <<= 8; 102 value |= *it++; 103 } 104 return value; 105 } 106 107 private: 108 virtual std::pair<size_t, size_t> GetPayloadIndecies() const override; 109 }; 110 111 } // namespace avrcp 112 } // namespace bluetooth 113