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 low complexity subband codec (SBC) 19 // 20 21 #ifndef A2DP_SBC_H 22 #define A2DP_SBC_H 23 24 #include <stddef.h> 25 #include <stdint.h> 26 27 #include "a2dp_codec_api.h" 28 #include "a2dp_sbc_constants.h" 29 #include "avdt_api.h" 30 #include "internal_include/bt_target.h" 31 #include "stack/include/bt_hdr.h" 32 33 class A2dpCodecConfigSbcBase : public A2dpCodecConfig { 34 protected: A2dpCodecConfigSbcBase(btav_a2dp_codec_index_t codec_index,const std::string & name,btav_a2dp_codec_priority_t codec_priority,bool is_source)35 A2dpCodecConfigSbcBase(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, A2DP_CODEC_ID_SBC, 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 A2dpCodecConfigSbcSource : public A2dpCodecConfigSbcBase { 51 public: 52 A2dpCodecConfigSbcSource(btav_a2dp_codec_priority_t codec_priority); 53 virtual ~A2dpCodecConfigSbcSource(); 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 A2dpCodecConfigSbcSink : public A2dpCodecConfigSbcBase { 63 public: 64 A2dpCodecConfigSbcSink(btav_a2dp_codec_priority_t codec_priority); 65 virtual ~A2dpCodecConfigSbcSink(); 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 SBC Source codec. 74 // NOTE: only codecs that are implemented are considered valid. 75 // Returns true if |p_codec_info| contains information about a valid SBC codec, 76 // otherwise false. 77 bool A2DP_IsSourceCodecValidSbc(const uint8_t* p_codec_info); 78 79 // Checks whether the codec capabilities contain a valid A2DP SBC Sink codec. 80 // NOTE: only codecs that are implemented are considered valid. 81 // Returns true if |p_codec_info| contains information about a valid SBC codec, 82 // otherwise false. 83 bool A2DP_IsSinkCodecValidSbc(const uint8_t* p_codec_info); 84 85 // Checks whether the codec capabilities contain a valid peer A2DP SBC 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 SBC codec, 89 // otherwise false. 90 bool A2DP_IsPeerSourceCodecValidSbc(const uint8_t* p_codec_info); 91 92 // Checks whether the codec capabilities contain a valid peer A2DP SBC 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 SBC codec, 96 // otherwise false. 97 bool A2DP_IsPeerSinkCodecValidSbc(const uint8_t* p_codec_info); 98 99 // Checks whether A2DP SBC Sink codec is supported. 100 // |p_codec_info| contains information about the codec capabilities. 101 // Returns true if the A2DP SBC Sink codec is supported, otherwise false. 102 bool A2DP_IsSinkCodecSupportedSbc(const uint8_t* p_codec_info); 103 104 // Checks whether an A2DP SBC 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 SBC Source codec for a peer Source device is 109 // supported, otherwise false. 110 bool A2DP_IsPeerSourceCodecSupportedSbc(const uint8_t* p_codec_info); 111 112 // Initialize state with the default A2DP SBC codec. 113 // The initialized state with the codec capabilities is stored in 114 // |p_codec_info|. 115 void A2DP_InitDefaultCodecSbc(uint8_t* p_codec_info); 116 117 // Gets the A2DP SBC codec name for a given |p_codec_info|. 118 const char* A2DP_CodecNameSbc(const uint8_t* p_codec_info); 119 120 // Checks whether two A2DP SBC codecs |p_codec_info_a| and |p_codec_info_b| 121 // have the same type. 122 // Returns true if the two codecs have the same type, otherwise false. 123 bool A2DP_CodecTypeEqualsSbc(const uint8_t* p_codec_info_a, 124 const uint8_t* p_codec_info_b); 125 126 // Checks whether two A2DP SBC codecs |p_codec_info_a| and |p_codec_info_b| 127 // are exactly the same. 128 // Returns true if the two codecs are exactly the same, otherwise false. 129 // If the codec type is not SBC, the return value is false. 130 bool A2DP_CodecEqualsSbc(const uint8_t* p_codec_info_a, 131 const uint8_t* p_codec_info_b); 132 133 // Gets the track sample rate value for the A2DP SBC codec. 134 // |p_codec_info| is a pointer to the SBC codec_info to decode. 135 // Returns the track sample rate on success, or -1 if |p_codec_info| 136 // contains invalid codec information. 137 int A2DP_GetTrackSampleRateSbc(const uint8_t* p_codec_info); 138 139 // Gets the track bits per sample value for the A2DP SBC codec. 140 // |p_codec_info| is a pointer to the SBC codec_info to decode. 141 // Returns the track bits per sample on success, or -1 if |p_codec_info| 142 // contains invalid codec information. 143 int A2DP_GetTrackBitsPerSampleSbc(const uint8_t* p_codec_info); 144 145 // Gets the channel count for the A2DP SBC codec. 146 // |p_codec_info| is a pointer to the SBC codec_info to decode. 147 // Returns the channel count on success, or -1 if |p_codec_info| 148 // contains invalid codec information. 149 int A2DP_GetTrackChannelCountSbc(const uint8_t* p_codec_info); 150 151 // Gets the number of subbands for the A2DP SBC codec. 152 // |p_codec_info| is a pointer to the SBC codec_info to decode. 153 // Returns the number of subbands on success, or -1 if |p_codec_info| 154 // contains invalid codec information. 155 int A2DP_GetNumberOfSubbandsSbc(const uint8_t* p_codec_info); 156 157 // Gets the number of blocks for the A2DP SBC codec. 158 // |p_codec_info| is a pointer to the SBC codec_info to decode. 159 // Returns the number of blocks on success, or -1 if |p_codec_info| 160 // contains invalid codec information. 161 int A2DP_GetNumberOfBlocksSbc(const uint8_t* p_codec_info); 162 163 // Gets the allocation method code for the A2DP SBC codec. 164 // The actual value is codec-specific - see |A2DP_SBC_IE_ALLOC_MD_*|. 165 // |p_codec_info| is a pointer to the SBC codec_info to decode. 166 // Returns the allocation method code on success, or -1 if |p_codec_info| 167 // contains invalid codec information. 168 int A2DP_GetAllocationMethodCodeSbc(const uint8_t* p_codec_info); 169 170 // Gets the channel mode code for the A2DP SBC codec. 171 // The actual value is codec-specific - see |A2DP_SBC_IE_CH_MD_*|. 172 // |p_codec_info| is a pointer to the SBC codec_info to decode. 173 // Returns the channel mode code on success, or -1 if |p_codec_info| 174 // contains invalid codec information. 175 int A2DP_GetChannelModeCodeSbc(const uint8_t* p_codec_info); 176 177 // Gets the sampling frequency code for the A2DP SBC codec. 178 // The actual value is codec-specific - see |A2DP_SBC_IE_SAMP_FREQ_*|. 179 // |p_codec_info| is a pointer to the SBC codec_info to decode. 180 // Returns the sampling frequency code on success, or -1 if |p_codec_info| 181 // contains invalid codec information. 182 int A2DP_GetSamplingFrequencyCodeSbc(const uint8_t* p_codec_info); 183 184 // Gets the minimum bitpool for the A2DP SBC codec. 185 // The actual value is codec-specific - see |A2DP_SBC_IE_MIN_BITPOOL|. 186 // |p_codec_info| is a pointer to the SBC codec_info to decode. 187 // Returns the minimum bitpool on success, or -1 if |p_codec_info| 188 // contains invalid codec information. 189 int A2DP_GetMinBitpoolSbc(const uint8_t* p_codec_info); 190 191 // Gets the maximum bitpool for the A2DP SBC codec. 192 // The actual value is codec-specific - see |A2DP_SBC_IE_MAX_BITPOOL|. 193 // |p_codec_info| is a pointer to the SBC codec_info to decode. 194 // Returns the maximum bitpool on success, or -1 if |p_codec_info| 195 // contains invalid codec information. 196 int A2DP_GetMaxBitpoolSbc(const uint8_t* p_codec_info); 197 198 // Gets the channel type for the A2DP SBC Sink codec: 199 // 1 for mono, or 3 for dual/stereo/joint. 200 // |p_codec_info| is a pointer to the SBC codec_info to decode. 201 // Returns the channel type on success, or -1 if |p_codec_info| 202 // contains invalid codec information. 203 int A2DP_GetSinkTrackChannelTypeSbc(const uint8_t* p_codec_info); 204 205 // Gets the A2DP SBC audio data timestamp from an audio packet. 206 // |p_codec_info| contains the codec information. 207 // |p_data| contains the audio data. 208 // The timestamp is stored in |p_timestamp|. 209 // Returns true on success, otherwise false. 210 bool A2DP_GetPacketTimestampSbc(const uint8_t* p_codec_info, 211 const uint8_t* p_data, uint32_t* p_timestamp); 212 213 // Builds A2DP SBC codec header for audio data. 214 // |p_codec_info| contains the codec information. 215 // |p_buf| contains the audio data. 216 // |frames_per_packet| is the number of frames in this packet. 217 // Returns true on success, otherwise false. 218 bool A2DP_BuildCodecHeaderSbc(const uint8_t* p_codec_info, BT_HDR* p_buf, 219 uint16_t frames_per_packet); 220 221 // Decodes A2DP SBC codec info into a human readable string. 222 // |p_codec_info| is a pointer to the SBC codec_info to decode. 223 // Returns a string describing the codec information. 224 std::string A2DP_CodecInfoStringSbc(const uint8_t* p_codec_info); 225 226 // Gets the A2DP SBC encoder interface that can be used to encode and prepare 227 // A2DP packets for transmission - see |tA2DP_ENCODER_INTERFACE|. 228 // |p_codec_info| contains the codec information. 229 // Returns the A2DP SBC encoder interface if the |p_codec_info| is valid and 230 // supported, otherwise NULL. 231 const tA2DP_ENCODER_INTERFACE* A2DP_GetEncoderInterfaceSbc( 232 const uint8_t* p_codec_info); 233 234 // Gets the A2DP SBC decoder interface that can be used to decode received A2DP 235 // packets - see |tA2DP_DECODER_INTERFACE|. 236 // |p_codec_info| contains the codec information. 237 // Returns the A2DP SBC decoder interface if the |p_codec_info| is valid and 238 // supported, otherwise NULL. 239 const tA2DP_DECODER_INTERFACE* A2DP_GetDecoderInterfaceSbc( 240 const uint8_t* p_codec_info); 241 242 // Adjusts the A2DP SBC codec, based on local support and Bluetooth 243 // specification. 244 // |p_codec_info| contains the codec information to adjust. 245 // Returns true if |p_codec_info| is valid and supported, otherwise false. 246 bool A2DP_AdjustCodecSbc(uint8_t* p_codec_info); 247 248 // Gets the A2DP SBC Source codec index for a given |p_codec_info|. 249 // Returns the corresponding |btav_a2dp_codec_index_t| on success, 250 // otherwise |BTAV_A2DP_CODEC_INDEX_MAX|. 251 btav_a2dp_codec_index_t A2DP_SourceCodecIndexSbc(const uint8_t* p_codec_info); 252 253 // Gets the A2DP SBC Sink codec index for a given |p_codec_info|. 254 // Returns the corresponding |btav_a2dp_codec_index_t| on success, 255 // otherwise |BTAV_A2DP_CODEC_INDEX_MAX|. 256 btav_a2dp_codec_index_t A2DP_SinkCodecIndexSbc(const uint8_t* p_codec_info); 257 258 // Gets the A2DP SBC Source codec name. 259 const char* A2DP_CodecIndexStrSbc(void); 260 261 // Gets the A2DP SBC Sink codec name. 262 const char* A2DP_CodecIndexStrSbcSink(void); 263 264 // Initializes A2DP SBC Source codec information into |AvdtpSepConfig| 265 // configuration entry pointed by |p_cfg|. 266 bool A2DP_InitCodecConfigSbc(AvdtpSepConfig* p_cfg); 267 268 // Initializes A2DP SBC Sink codec information into |AvdtpSepConfig| 269 // configuration entry pointed by |p_cfg|. 270 bool A2DP_InitCodecConfigSbcSink(AvdtpSepConfig* p_cfg); 271 272 // Get SBC bitrate 273 // Returns |uint32_t| bitrate value in bits per second 274 uint32_t A2DP_GetBitrateSbc(); 275 276 #endif // A2DP_SBC_H 277