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, 35 const std::string& name, 36 btav_a2dp_codec_priority_t codec_priority, 37 bool is_source) 38 : A2dpCodecConfig(codec_index, A2DP_CODEC_ID_AAC, name, codec_priority), 39 is_source_(is_source) {} 40 bool setCodecConfig(const uint8_t* p_peer_codec_info, bool is_capability, 41 uint8_t* p_result_codec_config) override; 42 bool setPeerCodecCapabilities( 43 const uint8_t* p_peer_codec_capabilities) override; 44 45 private: 46 bool is_source_; // True if local is Source 47 }; 48 49 class A2dpCodecConfigAacSource : public A2dpCodecConfigAacBase { 50 public: 51 A2dpCodecConfigAacSource(btav_a2dp_codec_priority_t codec_priority); 52 virtual ~A2dpCodecConfigAacSource(); 53 54 bool init() override; 55 56 private: 57 bool useRtpHeaderMarkerBit() const override; 58 void debug_codec_dump(int fd) override; 59 }; 60 61 class A2dpCodecConfigAacSink : public A2dpCodecConfigAacBase { 62 public: 63 A2dpCodecConfigAacSink(btav_a2dp_codec_priority_t codec_priority); 64 virtual ~A2dpCodecConfigAacSink(); 65 66 bool init() override; 67 68 private: 69 bool useRtpHeaderMarkerBit() const override; 70 }; 71 72 // Checks whether the codec capabilities contain a valid A2DP AAC Source 73 // codec. 74 // NOTE: only codecs that are implemented are considered valid. 75 // Returns true if |p_codec_info| contains information about a valid AAC 76 // codec, otherwise false. 77 bool A2DP_IsSourceCodecValidAac(const uint8_t* p_codec_info); 78 79 // Checks whether the codec capabilities contain a valid A2DP AAC Sink codec. 80 // NOTE: only codecs that are implemented are considered valid. 81 // Returns true if |p_codec_info| contains information about a valid AAC codec, 82 // otherwise false. 83 bool A2DP_IsSinkCodecValidAac(const uint8_t* p_codec_info); 84 85 // Checks whether the codec capabilities contain a valid peer A2DP AAC Source 86 // codec. 87 // NOTE: only codecs that are implemented are considered valid. 88 // Returns true if |p_codec_info| contains information about a valid AAC codec, 89 // otherwise false. 90 bool A2DP_IsPeerSourceCodecValidAac(const uint8_t* p_codec_info); 91 92 // Checks whether the codec capabilities contain a valid peer A2DP AAC Sink 93 // codec. 94 // NOTE: only codecs that are implemented are considered valid. 95 // Returns true if |p_codec_info| contains information about a valid AAC 96 // codec, otherwise false. 97 bool A2DP_IsPeerSinkCodecValidAac(const uint8_t* p_codec_info); 98 99 // Checks whether A2DP AAC Sink codec is supported. 100 // |p_codec_info| contains information about the codec capabilities. 101 // Returns true if the A2DP AAC Sink codec is supported, otherwise false. 102 bool A2DP_IsSinkCodecSupportedAac(const uint8_t* p_codec_info); 103 104 // Checks whether an A2DP AAC Source codec for a peer Source device is 105 // supported. 106 // |p_codec_info| contains information about the codec capabilities of the 107 // peer device. 108 // Returns true if the A2DP AAC Source codec for a peer Source device is 109 // supported, otherwise false. 110 bool A2DP_IsPeerSourceCodecSupportedAac(const uint8_t* p_codec_info); 111 112 // Checks whether the A2DP data packets should contain RTP header. 113 // |content_protection_enabled| is true if Content Protection is 114 // enabled. |p_codec_info| contains information about the codec capabilities. 115 // Returns true if the A2DP data packets should contain RTP header, otherwise 116 // false. 117 bool A2DP_UsesRtpHeaderAac(bool content_protection_enabled, 118 const uint8_t* p_codec_info); 119 120 // Gets the A2DP AAC codec name for a given |p_codec_info|. 121 const char* A2DP_CodecNameAac(const uint8_t* p_codec_info); 122 123 // Checks whether two A2DP AAC codecs |p_codec_info_a| and |p_codec_info_b| 124 // have the same type. 125 // Returns true if the two codecs have the same type, otherwise false. 126 bool A2DP_CodecTypeEqualsAac(const uint8_t* p_codec_info_a, 127 const uint8_t* p_codec_info_b); 128 129 // Checks whether two A2DP AAC codecs |p_codec_info_a| and |p_codec_info_b| 130 // are exactly the same. 131 // Returns true if the two codecs are exactly the same, otherwise false. 132 // If the codec type is not AAC, the return value is false. 133 bool A2DP_CodecEqualsAac(const uint8_t* p_codec_info_a, 134 const uint8_t* p_codec_info_b); 135 136 // Gets the track sample rate value for the A2DP AAC codec. 137 // |p_codec_info| is a pointer to the AAC codec_info to decode. 138 // Returns the track sample rate on success, or -1 if |p_codec_info| 139 // contains invalid codec information. 140 int A2DP_GetTrackSampleRateAac(const uint8_t* p_codec_info); 141 142 // Gets the track bits per sample value for the A2DP AAC codec. 143 // |p_codec_info| is a pointer to the AAC codec_info to decode. 144 // Returns the track bits per sample on success, or -1 if |p_codec_info| 145 // contains invalid codec information. 146 int A2DP_GetTrackBitsPerSampleAac(const uint8_t* p_codec_info); 147 148 // Gets the channel count for the A2DP AAC codec. 149 // |p_codec_info| is a pointer to the AAC codec_info to decode. 150 // Returns the channel count on success, or -1 if |p_codec_info| 151 // contains invalid codec information. 152 int A2DP_GetTrackChannelCountAac(const uint8_t* p_codec_info); 153 154 // Gets the channel type for the A2DP AAC Sink codec: 155 // 1 for mono, or 3 for dual/stereo/joint. 156 // |p_codec_info| is a pointer to the AAC codec_info to decode. 157 // Returns the channel type on success, or -1 if |p_codec_info| 158 // contains invalid codec information. 159 int A2DP_GetSinkTrackChannelTypeAac(const uint8_t* p_codec_info); 160 161 // Gets the object type code for the A2DP AAC codec. 162 // The actual value is codec-specific - see |A2DP_AAC_OBJECT_TYPE_*|. 163 // |p_codec_info| is a pointer to the AAC codec_info to decode. 164 // Returns the object type code on success, or -1 if |p_codec_info| 165 // contains invalid codec information. 166 int A2DP_GetObjectTypeCodeAac(const uint8_t* p_codec_info); 167 168 // Gets the channel mode code for the A2DP AAC codec. 169 // The actual value is codec-specific - see |A2DP_AAC_CHANNEL_MODE_*|. 170 // |p_codec_info| is a pointer to the AAC codec_info to decode. 171 // Returns the channel mode code on success, or -1 if |p_codec_info| 172 // contains invalid codec information. 173 int A2DP_GetChannelModeCodeAac(const uint8_t* p_codec_info); 174 175 // Gets the variable bit rate support for the A2DP AAC codec. 176 // The actual value is codec-specific - see |A2DP_AAC_VARIABLE_BIT_RATE_*|. 177 // |p_codec_info| is a pointer to the AAC codec_info to decode. 178 // Returns the variable bit rate support on success, or -1 if |p_codec_info| 179 // contains invalid codec information. 180 int A2DP_GetVariableBitRateSupportAac(const uint8_t* p_codec_info); 181 182 // Gets the bit rate for the A2DP AAC codec. 183 // The actual value is codec-specific - for AAC it is in bits per second. 184 // |p_codec_info| is a pointer to the AAC codec_info to decode. 185 // Returns the bit rate on success, or -1 if |p_codec_info| 186 // contains invalid codec information. 187 int A2DP_GetBitRateAac(const uint8_t* p_codec_info); 188 189 // Computes the maximum bit rate for the A2DP AAC codec based on the MTU. 190 // The actual value is codec-specific - for AAC it is in bits per second. 191 // |p_codec_info| is a pointer to the AAC codec_info to decode. 192 // |mtu| is the MTU to use for the computation. 193 // Returns the maximum bit rate on success, or -1 if |p_codec_info| 194 // contains invalid codec information. 195 int A2DP_ComputeMaxBitRateAac(const uint8_t* p_codec_info, uint16_t mtu); 196 197 // Gets the A2DP AAC audio data timestamp from an audio packet. 198 // |p_codec_info| contains the codec information. 199 // |p_data| contains the audio data. 200 // The timestamp is stored in |p_timestamp|. 201 // Returns true on success, otherwise false. 202 bool A2DP_GetPacketTimestampAac(const uint8_t* p_codec_info, 203 const uint8_t* p_data, uint32_t* p_timestamp); 204 205 // Builds A2DP AAC codec header for audio data. 206 // |p_codec_info| contains the codec information. 207 // |p_buf| contains the audio data. 208 // |frames_per_packet| is the number of frames in this packet. 209 // Returns true on success, otherwise false. 210 bool A2DP_BuildCodecHeaderAac(const uint8_t* p_codec_info, BT_HDR* p_buf, 211 uint16_t frames_per_packet); 212 213 // Decodes A2DP AAC codec info into a human readable string. 214 // |p_codec_info| is a pointer to the AAC codec_info to decode. 215 // Returns a string describing the codec information. 216 std::string A2DP_CodecInfoStringAac(const uint8_t* p_codec_info); 217 218 // Gets the A2DP AAC encoder interface that can be used to encode and prepare 219 // A2DP packets for transmission - see |tA2DP_ENCODER_INTERFACE|. 220 // |p_codec_info| contains the codec information. 221 // Returns the A2DP AAC encoder interface if the |p_codec_info| is valid and 222 // supported, otherwise NULL. 223 const tA2DP_ENCODER_INTERFACE* A2DP_GetEncoderInterfaceAac( 224 const uint8_t* p_codec_info); 225 226 // Gets the current A2DP AAC decoder interface that can be used to decode 227 // received A2DP packets - see |tA2DP_DECODER_INTERFACE|. 228 // |p_codec_info| contains the codec information. 229 // Returns the A2DP AAC decoder interface if the |p_codec_info| is valid and 230 // supported, otherwise NULL. 231 const tA2DP_DECODER_INTERFACE* A2DP_GetDecoderInterfaceAac( 232 const uint8_t* p_codec_info); 233 234 // Adjusts the A2DP AAC codec, based on local support and Bluetooth 235 // specification. 236 // |p_codec_info| contains the codec information to adjust. 237 // Returns true if |p_codec_info| is valid and supported, otherwise false. 238 bool A2DP_AdjustCodecAac(uint8_t* p_codec_info); 239 240 // Gets the A2DP AAC Source codec index for a given |p_codec_info|. 241 // Returns the corresponding |btav_a2dp_codec_index_t| on success, 242 // otherwise |BTAV_A2DP_CODEC_INDEX_MAX|. 243 btav_a2dp_codec_index_t A2DP_SourceCodecIndexAac(const uint8_t* p_codec_info); 244 245 // Gets the A2DP AAC Sink codec index for a given |p_codec_info|. 246 // Returns the corresponding |btav_a2dp_codec_index_t| on success, 247 // otherwise |BTAV_A2DP_CODEC_INDEX_MAX|. 248 btav_a2dp_codec_index_t A2DP_SinkCodecIndexAac(const uint8_t* p_codec_info); 249 250 // Gets the A2DP AAC Source codec name. 251 const char* A2DP_CodecIndexStrAac(void); 252 253 // Gets the A2DP AAC Sink codec name. 254 const char* A2DP_CodecIndexStrAacSink(void); 255 256 // Initializes A2DP AAC Source codec information into |AvdtpSepConfig| 257 // configuration entry pointed by |p_cfg|. 258 bool A2DP_InitCodecConfigAac(AvdtpSepConfig* p_cfg); 259 260 // Initializes A2DP AAC Sink codec information into |AvdtpSepConfig| 261 // configuration entry pointed by |p_cfg|. 262 bool A2DP_InitCodecConfigAacSink(AvdtpSepConfig* p_cfg); 263 264 #endif // A2DP_AAC_H 265