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 <bt_target.h> 25 #include <stddef.h> 26 #include <stdint.h> 27 28 #include "a2dp_aac_constants.h" 29 #include "a2dp_codec_api.h" 30 #include "avdt_api.h" 31 #include "stack/include/bt_hdr.h" 32 33 class A2dpCodecConfigAacBase : public A2dpCodecConfig { 34 protected: A2dpCodecConfigAacBase(btav_a2dp_codec_index_t codec_index,const std::string & name,btav_a2dp_codec_priority_t codec_priority,bool is_source)35 A2dpCodecConfigAacBase(btav_a2dp_codec_index_t codec_index, 36 const std::string& name, 37 btav_a2dp_codec_priority_t codec_priority, 38 bool is_source) 39 : A2dpCodecConfig(codec_index, name, codec_priority), 40 is_source_(is_source) {} 41 bool setCodecConfig(const uint8_t* p_peer_codec_info, bool is_capability, 42 uint8_t* p_result_codec_config) override; 43 bool setPeerCodecCapabilities( 44 const uint8_t* p_peer_codec_capabilities) override; 45 46 private: 47 bool is_source_; // True if local is Source 48 }; 49 50 class A2dpCodecConfigAacSource : public A2dpCodecConfigAacBase { 51 public: 52 A2dpCodecConfigAacSource(btav_a2dp_codec_priority_t codec_priority); 53 virtual ~A2dpCodecConfigAacSource(); 54 55 bool init() override; 56 57 private: 58 bool useRtpHeaderMarkerBit() const override; 59 void debug_codec_dump(int fd) override; 60 }; 61 62 class A2dpCodecConfigAacSink : public A2dpCodecConfigAacBase { 63 public: 64 A2dpCodecConfigAacSink(btav_a2dp_codec_priority_t codec_priority); 65 virtual ~A2dpCodecConfigAacSink(); 66 67 bool init() override; 68 69 private: 70 bool useRtpHeaderMarkerBit() const override; 71 }; 72 73 // Checks whether the codec capabilities contain a valid A2DP AAC Source 74 // codec. 75 // NOTE: only codecs that are implemented are considered valid. 76 // Returns true if |p_codec_info| contains information about a valid AAC 77 // codec, otherwise false. 78 bool A2DP_IsSourceCodecValidAac(const uint8_t* p_codec_info); 79 80 // Checks whether the codec capabilities contain a valid A2DP AAC Sink codec. 81 // NOTE: only codecs that are implemented are considered valid. 82 // Returns true if |p_codec_info| contains information about a valid AAC codec, 83 // otherwise false. 84 bool A2DP_IsSinkCodecValidAac(const uint8_t* p_codec_info); 85 86 // Checks whether the codec capabilities contain a valid peer A2DP AAC Source 87 // codec. 88 // NOTE: only codecs that are implemented are considered valid. 89 // Returns true if |p_codec_info| contains information about a valid AAC codec, 90 // otherwise false. 91 bool A2DP_IsPeerSourceCodecValidAac(const uint8_t* p_codec_info); 92 93 // Checks whether the codec capabilities contain a valid peer A2DP AAC Sink 94 // codec. 95 // NOTE: only codecs that are implemented are considered valid. 96 // Returns true if |p_codec_info| contains information about a valid AAC 97 // codec, otherwise false. 98 bool A2DP_IsPeerSinkCodecValidAac(const uint8_t* p_codec_info); 99 100 // Checks whether A2DP AAC Sink codec is supported. 101 // |p_codec_info| contains information about the codec capabilities. 102 // Returns true if the A2DP AAC Sink codec is supported, otherwise false. 103 bool A2DP_IsSinkCodecSupportedAac(const uint8_t* p_codec_info); 104 105 // Checks whether an A2DP AAC Source codec for a peer Source device is 106 // supported. 107 // |p_codec_info| contains information about the codec capabilities of the 108 // peer device. 109 // Returns true if the A2DP AAC Source codec for a peer Source device is 110 // supported, otherwise false. 111 bool A2DP_IsPeerSourceCodecSupportedAac(const uint8_t* p_codec_info); 112 113 // Checks whether the A2DP data packets should contain RTP header. 114 // |content_protection_enabled| is true if Content Protection is 115 // enabled. |p_codec_info| contains information about the codec capabilities. 116 // Returns true if the A2DP data packets should contain RTP header, otherwise 117 // false. 118 bool A2DP_UsesRtpHeaderAac(bool content_protection_enabled, 119 const uint8_t* p_codec_info); 120 121 // Gets the A2DP AAC codec name for a given |p_codec_info|. 122 const char* A2DP_CodecNameAac(const uint8_t* p_codec_info); 123 124 // Checks whether two A2DP AAC codecs |p_codec_info_a| and |p_codec_info_b| 125 // have the same type. 126 // Returns true if the two codecs have the same type, otherwise false. 127 bool A2DP_CodecTypeEqualsAac(const uint8_t* p_codec_info_a, 128 const uint8_t* p_codec_info_b); 129 130 // Checks whether two A2DP AAC codecs |p_codec_info_a| and |p_codec_info_b| 131 // are exactly the same. 132 // Returns true if the two codecs are exactly the same, otherwise false. 133 // If the codec type is not AAC, the return value is false. 134 bool A2DP_CodecEqualsAac(const uint8_t* p_codec_info_a, 135 const uint8_t* p_codec_info_b); 136 137 // Gets the track sample rate value for the A2DP AAC codec. 138 // |p_codec_info| is a pointer to the AAC codec_info to decode. 139 // Returns the track sample rate on success, or -1 if |p_codec_info| 140 // contains invalid codec information. 141 int A2DP_GetTrackSampleRateAac(const uint8_t* p_codec_info); 142 143 // Gets the track bits per sample value for the A2DP AAC codec. 144 // |p_codec_info| is a pointer to the AAC codec_info to decode. 145 // Returns the track bits per sample on success, or -1 if |p_codec_info| 146 // contains invalid codec information. 147 int A2DP_GetTrackBitsPerSampleAac(const uint8_t* p_codec_info); 148 149 // Gets the channel count for the A2DP AAC codec. 150 // |p_codec_info| is a pointer to the AAC codec_info to decode. 151 // Returns the channel count on success, or -1 if |p_codec_info| 152 // contains invalid codec information. 153 int A2DP_GetTrackChannelCountAac(const uint8_t* p_codec_info); 154 155 // Gets the channel type for the A2DP AAC Sink codec: 156 // 1 for mono, or 3 for dual/stereo/joint. 157 // |p_codec_info| is a pointer to the AAC codec_info to decode. 158 // Returns the channel type on success, or -1 if |p_codec_info| 159 // contains invalid codec information. 160 int A2DP_GetSinkTrackChannelTypeAac(const uint8_t* p_codec_info); 161 162 // Gets the object type code for the A2DP AAC codec. 163 // The actual value is codec-specific - see |A2DP_AAC_OBJECT_TYPE_*|. 164 // |p_codec_info| is a pointer to the AAC codec_info to decode. 165 // Returns the object type code on success, or -1 if |p_codec_info| 166 // contains invalid codec information. 167 int A2DP_GetObjectTypeCodeAac(const uint8_t* p_codec_info); 168 169 // Gets the channel mode code for the A2DP AAC codec. 170 // The actual value is codec-specific - see |A2DP_AAC_CHANNEL_MODE_*|. 171 // |p_codec_info| is a pointer to the AAC codec_info to decode. 172 // Returns the channel mode code on success, or -1 if |p_codec_info| 173 // contains invalid codec information. 174 int A2DP_GetChannelModeCodeAac(const uint8_t* p_codec_info); 175 176 // Gets the variable bit rate support for the A2DP AAC codec. 177 // The actual value is codec-specific - see |A2DP_AAC_VARIABLE_BIT_RATE_*|. 178 // |p_codec_info| is a pointer to the AAC codec_info to decode. 179 // Returns the variable bit rate support on success, or -1 if |p_codec_info| 180 // contains invalid codec information. 181 int A2DP_GetVariableBitRateSupportAac(const uint8_t* p_codec_info); 182 183 // Gets the bit rate for the A2DP AAC codec. 184 // The actual value is codec-specific - for AAC it is in bits per second. 185 // |p_codec_info| is a pointer to the AAC codec_info to decode. 186 // Returns the bit rate on success, or -1 if |p_codec_info| 187 // contains invalid codec information. 188 int A2DP_GetBitRateAac(const uint8_t* p_codec_info); 189 190 // Computes the maximum bit rate for the A2DP AAC codec based on the MTU. 191 // The actual value is codec-specific - for AAC it is in bits per second. 192 // |p_codec_info| is a pointer to the AAC codec_info to decode. 193 // |mtu| is the MTU to use for the computation. 194 // Returns the maximum bit rate on success, or -1 if |p_codec_info| 195 // contains invalid codec information. 196 int A2DP_ComputeMaxBitRateAac(const uint8_t* p_codec_info, uint16_t mtu); 197 198 // Gets the A2DP AAC audio data timestamp from an audio packet. 199 // |p_codec_info| contains the codec information. 200 // |p_data| contains the audio data. 201 // The timestamp is stored in |p_timestamp|. 202 // Returns true on success, otherwise false. 203 bool A2DP_GetPacketTimestampAac(const uint8_t* p_codec_info, 204 const uint8_t* p_data, uint32_t* p_timestamp); 205 206 // Builds A2DP AAC codec header for audio data. 207 // |p_codec_info| contains the codec information. 208 // |p_buf| contains the audio data. 209 // |frames_per_packet| is the number of frames in this packet. 210 // Returns true on success, otherwise false. 211 bool A2DP_BuildCodecHeaderAac(const uint8_t* p_codec_info, BT_HDR* p_buf, 212 uint16_t frames_per_packet); 213 214 // Decodes A2DP AAC codec info into a human readable string. 215 // |p_codec_info| is a pointer to the AAC codec_info to decode. 216 // Returns a string describing the codec information. 217 std::string A2DP_CodecInfoStringAac(const uint8_t* p_codec_info); 218 219 // Gets the A2DP AAC encoder interface that can be used to encode and prepare 220 // A2DP packets for transmission - see |tA2DP_ENCODER_INTERFACE|. 221 // |p_codec_info| contains the codec information. 222 // Returns the A2DP AAC encoder interface if the |p_codec_info| is valid and 223 // supported, otherwise NULL. 224 const tA2DP_ENCODER_INTERFACE* A2DP_GetEncoderInterfaceAac( 225 const uint8_t* p_codec_info); 226 227 // Gets the current A2DP AAC decoder interface that can be used to decode 228 // received A2DP packets - see |tA2DP_DECODER_INTERFACE|. 229 // |p_codec_info| contains the codec information. 230 // Returns the A2DP AAC decoder interface if the |p_codec_info| is valid and 231 // supported, otherwise NULL. 232 const tA2DP_DECODER_INTERFACE* A2DP_GetDecoderInterfaceAac( 233 const uint8_t* p_codec_info); 234 235 // Adjusts the A2DP AAC codec, based on local support and Bluetooth 236 // specification. 237 // |p_codec_info| contains the codec information to adjust. 238 // Returns true if |p_codec_info| is valid and supported, otherwise false. 239 bool A2DP_AdjustCodecAac(uint8_t* p_codec_info); 240 241 // Gets the A2DP AAC Source codec index for a given |p_codec_info|. 242 // Returns the corresponding |btav_a2dp_codec_index_t| on success, 243 // otherwise |BTAV_A2DP_CODEC_INDEX_MAX|. 244 btav_a2dp_codec_index_t A2DP_SourceCodecIndexAac(const uint8_t* p_codec_info); 245 246 // Gets the A2DP AAC Sink codec index for a given |p_codec_info|. 247 // Returns the corresponding |btav_a2dp_codec_index_t| on success, 248 // otherwise |BTAV_A2DP_CODEC_INDEX_MAX|. 249 btav_a2dp_codec_index_t A2DP_SinkCodecIndexAac(const uint8_t* p_codec_info); 250 251 // Gets the A2DP AAC Source codec name. 252 const char* A2DP_CodecIndexStrAac(void); 253 254 // Gets the A2DP AAC Sink codec name. 255 const char* A2DP_CodecIndexStrAacSink(void); 256 257 // Initializes A2DP AAC Source codec information into |AvdtpSepConfig| 258 // configuration entry pointed by |p_cfg|. 259 bool A2DP_InitCodecConfigAac(AvdtpSepConfig* p_cfg); 260 261 // Initializes A2DP AAC Sink codec information into |AvdtpSepConfig| 262 // configuration entry pointed by |p_cfg|. 263 bool A2DP_InitCodecConfigAacSink(AvdtpSepConfig* p_cfg); 264 265 #endif // A2DP_AAC_H 266