1 /* 2 * Copyright 2016 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 // 18 // A2DP Codec API for AAC 19 // 20 21 #ifndef A2DP_AAC_H 22 #define A2DP_AAC_H 23 24 #include <stdint.h> 25 26 #include "a2dp_aac_constants.h" 27 #include "a2dp_codec_api.h" 28 #include "avdt_api.h" 29 #include "internal_include/bt_target.h" 30 #include "stack/include/bt_hdr.h" 31 32 class A2dpCodecConfigAacBase : public A2dpCodecConfig { 33 protected: A2dpCodecConfigAacBase(btav_a2dp_codec_index_t codec_index,const std::string & name,btav_a2dp_codec_priority_t codec_priority,bool is_source)34 A2dpCodecConfigAacBase(btav_a2dp_codec_index_t codec_index, const std::string& name, 35 btav_a2dp_codec_priority_t codec_priority, bool is_source) 36 : A2dpCodecConfig(codec_index, bluetooth::a2dp::CodecId::AAC, name, codec_priority), 37 is_source_(is_source) {} 38 tA2DP_STATUS setCodecConfig(const uint8_t* p_peer_codec_info, bool is_capability, 39 uint8_t* p_result_codec_config) override; 40 bool setPeerCodecCapabilities(const uint8_t* p_peer_codec_capabilities) override; 41 42 private: 43 bool is_source_; // True if local is Source 44 }; 45 46 class A2dpCodecConfigAacSource : public A2dpCodecConfigAacBase { 47 public: 48 A2dpCodecConfigAacSource(btav_a2dp_codec_priority_t codec_priority); 49 virtual ~A2dpCodecConfigAacSource(); 50 51 bool init() override; 52 53 private: 54 bool useRtpHeaderMarkerBit() const override; 55 void debug_codec_dump(int fd) override; 56 }; 57 58 class A2dpCodecConfigAacSink : public A2dpCodecConfigAacBase { 59 public: 60 A2dpCodecConfigAacSink(btav_a2dp_codec_priority_t codec_priority); 61 virtual ~A2dpCodecConfigAacSink(); 62 63 bool init() override; 64 65 private: 66 bool useRtpHeaderMarkerBit() const override; 67 }; 68 69 // Checks whether the codec capabilities contain a valid A2DP AAC Source 70 // codec. 71 // NOTE: only codecs that are implemented are considered valid. 72 // Returns true if |p_codec_info| contains information about a valid AAC 73 // codec, otherwise false. 74 bool A2DP_IsCodecValidAac(const uint8_t* p_codec_info); 75 76 // Checks whether A2DP AAC Sink codec is supported. 77 // |p_codec_info| contains information about the codec capabilities. 78 // Returns true if the A2DP AAC Sink codec is supported, otherwise false. 79 tA2DP_STATUS A2DP_IsSinkCodecSupportedAac(const uint8_t* p_codec_info); 80 81 // Gets the A2DP AAC codec name for a given |p_codec_info|. 82 const char* A2DP_CodecNameAac(const uint8_t* p_codec_info); 83 84 // Checks whether two A2DP AAC codecs |p_codec_info_a| and |p_codec_info_b| 85 // have the same type. 86 // Returns true if the two codecs have the same type, otherwise false. 87 bool A2DP_CodecTypeEqualsAac(const uint8_t* p_codec_info_a, const uint8_t* p_codec_info_b); 88 89 // Checks whether two A2DP AAC codecs |p_codec_info_a| and |p_codec_info_b| 90 // are exactly the same. 91 // Returns true if the two codecs are exactly the same, otherwise false. 92 // If the codec type is not AAC, the return value is false. 93 bool A2DP_CodecEqualsAac(const uint8_t* p_codec_info_a, const uint8_t* p_codec_info_b); 94 95 // Gets the track sample rate value for the A2DP AAC codec. 96 // |p_codec_info| is a pointer to the AAC codec_info to decode. 97 // Returns the track sample rate on success, or -1 if |p_codec_info| 98 // contains invalid codec information. 99 int A2DP_GetTrackSampleRateAac(const uint8_t* p_codec_info); 100 101 // Gets the track bits per sample value for the A2DP AAC codec. 102 // |p_codec_info| is a pointer to the AAC codec_info to decode. 103 // Returns the track bits per sample on success, or -1 if |p_codec_info| 104 // contains invalid codec information. 105 int A2DP_GetTrackBitsPerSampleAac(const uint8_t* p_codec_info); 106 107 // Gets the channel count for the A2DP AAC codec. 108 // |p_codec_info| is a pointer to the AAC codec_info to decode. 109 // Returns the channel count on success, or -1 if |p_codec_info| 110 // contains invalid codec information. 111 int A2DP_GetTrackChannelCountAac(const uint8_t* p_codec_info); 112 113 // Gets the channel type for the A2DP AAC Sink codec: 114 // 1 for mono, or 3 for dual/stereo/joint. 115 // |p_codec_info| is a pointer to the AAC codec_info to decode. 116 // Returns the channel type on success, or -1 if |p_codec_info| 117 // contains invalid codec information. 118 int A2DP_GetSinkTrackChannelTypeAac(const uint8_t* p_codec_info); 119 120 // Gets the object type code for the A2DP AAC codec. 121 // The actual value is codec-specific - see |A2DP_AAC_OBJECT_TYPE_*|. 122 // |p_codec_info| is a pointer to the AAC codec_info to decode. 123 // Returns the object type code on success, or -1 if |p_codec_info| 124 // contains invalid codec information. 125 int A2DP_GetObjectTypeCodeAac(const uint8_t* p_codec_info); 126 127 // Gets the channel mode code for the A2DP AAC codec. 128 // The actual value is codec-specific - see |A2DP_AAC_CHANNEL_MODE_*|. 129 // |p_codec_info| is a pointer to the AAC codec_info to decode. 130 // Returns the channel mode code on success, or -1 if |p_codec_info| 131 // contains invalid codec information. 132 int A2DP_GetChannelModeCodeAac(const uint8_t* p_codec_info); 133 134 // Gets the variable bit rate support for the A2DP AAC codec. 135 // The actual value is codec-specific - see |A2DP_AAC_VARIABLE_BIT_RATE_*|. 136 // |p_codec_info| is a pointer to the AAC codec_info to decode. 137 // Returns the variable bit rate support on success, or -1 if |p_codec_info| 138 // contains invalid codec information. 139 int A2DP_GetVariableBitRateSupportAac(const uint8_t* p_codec_info); 140 141 // Gets the bit rate for the A2DP AAC codec. 142 // The actual value is codec-specific - for AAC it is in bits per second. 143 // |p_codec_info| is a pointer to the AAC codec_info to decode. 144 // Returns the bit rate on success, or -1 if |p_codec_info| 145 // contains invalid codec information. 146 int A2DP_GetBitRateAac(const uint8_t* p_codec_info); 147 148 // Computes the maximum bit rate for the A2DP AAC codec based on the MTU. 149 // The actual value is codec-specific - for AAC it is in bits per second. 150 // |p_codec_info| is a pointer to the AAC codec_info to decode. 151 // |mtu| is the MTU to use for the computation. 152 // Returns the maximum bit rate on success, or -1 if |p_codec_info| 153 // contains invalid codec information. 154 int A2DP_ComputeMaxBitRateAac(const uint8_t* p_codec_info, uint16_t mtu); 155 156 // Gets the A2DP AAC audio data timestamp from an audio packet. 157 // |p_codec_info| contains the codec information. 158 // |p_data| contains the audio data. 159 // The timestamp is stored in |p_timestamp|. 160 // Returns true on success, otherwise false. 161 bool A2DP_GetPacketTimestampAac(const uint8_t* p_codec_info, const uint8_t* p_data, 162 uint32_t* p_timestamp); 163 164 // Builds A2DP AAC codec header for audio data. 165 // |p_codec_info| contains the codec information. 166 // |p_buf| contains the audio data. 167 // |frames_per_packet| is the number of frames in this packet. 168 // Returns true on success, otherwise false. 169 bool A2DP_BuildCodecHeaderAac(const uint8_t* p_codec_info, BT_HDR* p_buf, 170 uint16_t frames_per_packet); 171 172 // Decodes A2DP AAC codec info into a human readable string. 173 // |p_codec_info| is a pointer to the AAC codec_info to decode. 174 // Returns a string describing the codec information. 175 std::string A2DP_CodecInfoStringAac(const uint8_t* p_codec_info); 176 177 // Gets the A2DP AAC encoder interface that can be used to encode and prepare 178 // A2DP packets for transmission - see |tA2DP_ENCODER_INTERFACE|. 179 // |p_codec_info| contains the codec information. 180 // Returns the A2DP AAC encoder interface if the |p_codec_info| is valid and 181 // supported, otherwise NULL. 182 const tA2DP_ENCODER_INTERFACE* A2DP_GetEncoderInterfaceAac(const uint8_t* p_codec_info); 183 184 // Gets the current A2DP AAC decoder interface that can be used to decode 185 // received A2DP packets - see |tA2DP_DECODER_INTERFACE|. 186 // |p_codec_info| contains the codec information. 187 // Returns the A2DP AAC decoder interface if the |p_codec_info| is valid and 188 // supported, otherwise NULL. 189 const tA2DP_DECODER_INTERFACE* A2DP_GetDecoderInterfaceAac(const uint8_t* p_codec_info); 190 191 // Adjusts the A2DP AAC codec, based on local support and Bluetooth 192 // specification. 193 // |p_codec_info| contains the codec information to adjust. 194 // Returns true if |p_codec_info| is valid and supported, otherwise false. 195 bool A2DP_AdjustCodecAac(uint8_t* p_codec_info); 196 197 // Gets the A2DP AAC Source codec index for a given |p_codec_info|. 198 // Returns the corresponding |btav_a2dp_codec_index_t| on success, 199 // otherwise |BTAV_A2DP_CODEC_INDEX_MAX|. 200 btav_a2dp_codec_index_t A2DP_SourceCodecIndexAac(const uint8_t* p_codec_info); 201 202 // Gets the A2DP AAC Sink codec index for a given |p_codec_info|. 203 // Returns the corresponding |btav_a2dp_codec_index_t| on success, 204 // otherwise |BTAV_A2DP_CODEC_INDEX_MAX|. 205 btav_a2dp_codec_index_t A2DP_SinkCodecIndexAac(const uint8_t* p_codec_info); 206 207 // Gets the A2DP AAC Source codec name. 208 const char* A2DP_CodecIndexStrAac(void); 209 210 // Gets the A2DP AAC Sink codec name. 211 const char* A2DP_CodecIndexStrAacSink(void); 212 213 // Initializes A2DP AAC Source codec information into |AvdtpSepConfig| 214 // configuration entry pointed by |p_cfg|. 215 bool A2DP_InitCodecConfigAac(AvdtpSepConfig* p_cfg); 216 217 // Initializes A2DP AAC Sink codec information into |AvdtpSepConfig| 218 // configuration entry pointed by |p_cfg|. 219 bool A2DP_InitCodecConfigAacSink(AvdtpSepConfig* p_cfg); 220 221 #endif // A2DP_AAC_H 222