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 "a2dp_codec_api.h" 25 #include "a2dp_sbc_constants.h" 26 #include "avdt_api.h" 27 28 class A2dpCodecConfigSbcBase : public A2dpCodecConfig { 29 protected: 30 A2dpCodecConfigSbcBase(btav_a2dp_codec_index_t codec_index, 31 const std::string& name, 32 btav_a2dp_codec_priority_t codec_priority, 33 bool is_source) 34 : A2dpCodecConfig(codec_index, name, codec_priority), 35 is_source_(is_source) {} 36 bool setCodecConfig(const uint8_t* p_peer_codec_info, bool is_capability, 37 uint8_t* p_result_codec_config) override; 38 bool setPeerCodecCapabilities( 39 const uint8_t* p_peer_codec_capabilities) override; 40 41 private: 42 bool is_source_; // True if local is Source 43 }; 44 45 class A2dpCodecConfigSbcSource : public A2dpCodecConfigSbcBase { 46 public: 47 A2dpCodecConfigSbcSource(btav_a2dp_codec_priority_t codec_priority); 48 virtual ~A2dpCodecConfigSbcSource(); 49 50 bool init() override; 51 period_ms_t encoderIntervalMs() const override; 52 int getEffectiveMtu() const override; 53 54 private: 55 bool useRtpHeaderMarkerBit() const override; 56 bool updateEncoderUserConfig( 57 const tA2DP_ENCODER_INIT_PEER_PARAMS* p_peer_params, 58 bool* p_restart_input, bool* p_restart_output, 59 bool* p_config_updated) override; 60 void debug_codec_dump(int fd) override; 61 }; 62 63 class A2dpCodecConfigSbcSink : public A2dpCodecConfigSbcBase { 64 public: 65 A2dpCodecConfigSbcSink(btav_a2dp_codec_priority_t codec_priority); 66 virtual ~A2dpCodecConfigSbcSink(); 67 68 bool init() override; 69 period_ms_t encoderIntervalMs() const override; 70 int getEffectiveMtu() const override; 71 72 private: 73 bool useRtpHeaderMarkerBit() const override; 74 bool updateEncoderUserConfig( 75 const tA2DP_ENCODER_INIT_PEER_PARAMS* p_peer_params, 76 bool* p_restart_input, bool* p_restart_output, 77 bool* p_config_updated) override; 78 }; 79 80 // Checks whether the codec capabilities contain a valid A2DP SBC Source codec. 81 // NOTE: only codecs that are implemented are considered valid. 82 // Returns true if |p_codec_info| contains information about a valid SBC codec, 83 // otherwise false. 84 bool A2DP_IsSourceCodecValidSbc(const uint8_t* p_codec_info); 85 86 // Checks whether the codec capabilities contain a valid A2DP SBC Sink 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_IsSinkCodecValidSbc(const uint8_t* p_codec_info); 91 92 // Checks whether the codec capabilities contain a valid peer A2DP SBC Source 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_IsPeerSourceCodecValidSbc(const uint8_t* p_codec_info); 98 99 // Checks whether the codec capabilities contain a valid peer A2DP SBC Sink 100 // codec. 101 // NOTE: only codecs that are implemented are considered valid. 102 // Returns true if |p_codec_info| contains information about a valid SBC codec, 103 // otherwise false. 104 bool A2DP_IsPeerSinkCodecValidSbc(const uint8_t* p_codec_info); 105 106 // Checks whether A2DP SBC Sink codec is supported. 107 // |p_codec_info| contains information about the codec capabilities. 108 // Returns true if the A2DP SBC Sink codec is supported, otherwise false. 109 bool A2DP_IsSinkCodecSupportedSbc(const uint8_t* p_codec_info); 110 111 // Checks whether an A2DP SBC Source codec for a peer Source device is 112 // supported. 113 // |p_codec_info| contains information about the codec capabilities of the 114 // peer device. 115 // Returns true if the A2DP SBC Source codec for a peer Source device is 116 // supported, otherwise false. 117 bool A2DP_IsPeerSourceCodecSupportedSbc(const uint8_t* p_codec_info); 118 119 // Initialize state with the default A2DP SBC codec. 120 // The initialized state with the codec capabilities is stored in 121 // |p_codec_info|. 122 void A2DP_InitDefaultCodecSbc(uint8_t* p_codec_info); 123 124 // Gets the A2DP SBC codec name for a given |p_codec_info|. 125 const char* A2DP_CodecNameSbc(const uint8_t* p_codec_info); 126 127 // Checks whether two A2DP SBC codecs |p_codec_info_a| and |p_codec_info_b| 128 // have the same type. 129 // Returns true if the two codecs have the same type, otherwise false. 130 bool A2DP_CodecTypeEqualsSbc(const uint8_t* p_codec_info_a, 131 const uint8_t* p_codec_info_b); 132 133 // Checks whether two A2DP SBC codecs |p_codec_info_a| and |p_codec_info_b| 134 // are exactly the same. 135 // Returns true if the two codecs are exactly the same, otherwise false. 136 // If the codec type is not SBC, the return value is false. 137 bool A2DP_CodecEqualsSbc(const uint8_t* p_codec_info_a, 138 const uint8_t* p_codec_info_b); 139 140 // Gets the track sample rate value for the A2DP SBC codec. 141 // |p_codec_info| is a pointer to the SBC codec_info to decode. 142 // Returns the track sample rate on success, or -1 if |p_codec_info| 143 // contains invalid codec information. 144 int A2DP_GetTrackSampleRateSbc(const uint8_t* p_codec_info); 145 146 // Gets the channel count for the A2DP SBC codec. 147 // |p_codec_info| is a pointer to the SBC codec_info to decode. 148 // Returns the channel count on success, or -1 if |p_codec_info| 149 // contains invalid codec information. 150 int A2DP_GetTrackChannelCountSbc(const uint8_t* p_codec_info); 151 152 // Gets the number of subbands for the A2DP SBC codec. 153 // |p_codec_info| is a pointer to the SBC codec_info to decode. 154 // Returns the number of subbands on success, or -1 if |p_codec_info| 155 // contains invalid codec information. 156 int A2DP_GetNumberOfSubbandsSbc(const uint8_t* p_codec_info); 157 158 // Gets the number of blocks for the A2DP SBC codec. 159 // |p_codec_info| is a pointer to the SBC codec_info to decode. 160 // Returns the number of blocks on success, or -1 if |p_codec_info| 161 // contains invalid codec information. 162 int A2DP_GetNumberOfBlocksSbc(const uint8_t* p_codec_info); 163 164 // Gets the allocation method code for the A2DP SBC codec. 165 // The actual value is codec-specific - see |A2DP_SBC_IE_ALLOC_MD_*|. 166 // |p_codec_info| is a pointer to the SBC codec_info to decode. 167 // Returns the allocation method code on success, or -1 if |p_codec_info| 168 // contains invalid codec information. 169 int A2DP_GetAllocationMethodCodeSbc(const uint8_t* p_codec_info); 170 171 // Gets the channel mode code for the A2DP SBC codec. 172 // The actual value is codec-specific - see |A2DP_SBC_IE_CH_MD_*|. 173 // |p_codec_info| is a pointer to the SBC codec_info to decode. 174 // Returns the channel mode code on success, or -1 if |p_codec_info| 175 // contains invalid codec information. 176 int A2DP_GetChannelModeCodeSbc(const uint8_t* p_codec_info); 177 178 // Gets the sampling frequency code for the A2DP SBC codec. 179 // The actual value is codec-specific - see |A2DP_SBC_IE_SAMP_FREQ_*|. 180 // |p_codec_info| is a pointer to the SBC codec_info to decode. 181 // Returns the sampling frequency code on success, or -1 if |p_codec_info| 182 // contains invalid codec information. 183 int A2DP_GetSamplingFrequencyCodeSbc(const uint8_t* p_codec_info); 184 185 // Gets the minimum bitpool for the A2DP SBC codec. 186 // The actual value is codec-specific - see |A2DP_SBC_IE_MIN_BITPOOL|. 187 // |p_codec_info| is a pointer to the SBC codec_info to decode. 188 // Returns the minimum bitpool on success, or -1 if |p_codec_info| 189 // contains invalid codec information. 190 int A2DP_GetMinBitpoolSbc(const uint8_t* p_codec_info); 191 192 // Gets the maximum bitpool for the A2DP SBC codec. 193 // The actual value is codec-specific - see |A2DP_SBC_IE_MAX_BITPOOL|. 194 // |p_codec_info| is a pointer to the SBC codec_info to decode. 195 // Returns the maximum bitpool on success, or -1 if |p_codec_info| 196 // contains invalid codec information. 197 int A2DP_GetMaxBitpoolSbc(const uint8_t* p_codec_info); 198 199 // Gets the channel type for the A2DP SBC Sink codec: 200 // 1 for mono, or 3 for dual/stereo/joint. 201 // |p_codec_info| is a pointer to the SBC codec_info to decode. 202 // Returns the channel type on success, or -1 if |p_codec_info| 203 // contains invalid codec information. 204 int A2DP_GetSinkTrackChannelTypeSbc(const uint8_t* p_codec_info); 205 206 // Gets the A2DP SBC audio data timestamp from an audio packet. 207 // |p_codec_info| contains the codec information. 208 // |p_data| contains the audio data. 209 // The timestamp is stored in |p_timestamp|. 210 // Returns true on success, otherwise false. 211 bool A2DP_GetPacketTimestampSbc(const uint8_t* p_codec_info, 212 const uint8_t* p_data, uint32_t* p_timestamp); 213 214 // Builds A2DP SBC codec header for audio data. 215 // |p_codec_info| contains the codec information. 216 // |p_buf| contains the audio data. 217 // |frames_per_packet| is the number of frames in this packet. 218 // Returns true on success, otherwise false. 219 bool A2DP_BuildCodecHeaderSbc(const uint8_t* p_codec_info, BT_HDR* p_buf, 220 uint16_t frames_per_packet); 221 222 // Decodes A2DP SBC codec info into a human readable string. 223 // |p_codec_info| is a pointer to the SBC codec_info to decode. 224 // Returns a string describing the codec information. 225 std::string A2DP_CodecInfoStringSbc(const uint8_t* p_codec_info); 226 227 // Gets the A2DP SBC encoder interface that can be used to encode and prepare 228 // A2DP packets for transmission - see |tA2DP_ENCODER_INTERFACE|. 229 // |p_codec_info| contains the codec information. 230 // Returns the A2DP SBC encoder interface if the |p_codec_info| is valid and 231 // supported, otherwise NULL. 232 const tA2DP_ENCODER_INTERFACE* A2DP_GetEncoderInterfaceSbc( 233 const uint8_t* p_codec_info); 234 235 // Gets the A2DP SBC decoder interface that can be used to decode received A2DP 236 // packets - see |tA2DP_DECODER_INTERFACE|. 237 // |p_codec_info| contains the codec information. 238 // Returns the A2DP SBC decoder interface if the |p_codec_info| is valid and 239 // supported, otherwise NULL. 240 const tA2DP_DECODER_INTERFACE* A2DP_GetDecoderInterfaceSbc( 241 const uint8_t* p_codec_info); 242 243 // Adjusts the A2DP SBC codec, based on local support and Bluetooth 244 // specification. 245 // |p_codec_info| contains the codec information to adjust. 246 // Returns true if |p_codec_info| is valid and supported, otherwise false. 247 bool A2DP_AdjustCodecSbc(uint8_t* p_codec_info); 248 249 // Gets the A2DP SBC Source codec index for a given |p_codec_info|. 250 // Returns the corresponding |btav_a2dp_codec_index_t| on success, 251 // otherwise |BTAV_A2DP_CODEC_INDEX_MAX|. 252 btav_a2dp_codec_index_t A2DP_SourceCodecIndexSbc(const uint8_t* p_codec_info); 253 254 // Gets the A2DP SBC Sink codec index for a given |p_codec_info|. 255 // Returns the corresponding |btav_a2dp_codec_index_t| on success, 256 // otherwise |BTAV_A2DP_CODEC_INDEX_MAX|. 257 btav_a2dp_codec_index_t A2DP_SinkCodecIndexSbc(const uint8_t* p_codec_info); 258 259 // Gets the A2DP SBC Source codec name. 260 const char* A2DP_CodecIndexStrSbc(void); 261 262 // Gets the A2DP SBC Sink codec name. 263 const char* A2DP_CodecIndexStrSbcSink(void); 264 265 // Initializes A2DP SBC Source codec information into |AvdtpSepConfig| 266 // configuration entry pointed by |p_cfg|. 267 bool A2DP_InitCodecConfigSbc(AvdtpSepConfig* p_cfg); 268 269 // Initializes A2DP SBC Sink codec information into |AvdtpSepConfig| 270 // configuration entry pointed by |p_cfg|. 271 bool A2DP_InitCodecConfigSbcSink(AvdtpSepConfig* p_cfg); 272 273 // Get SBC bitrate 274 // Returns |uint32_t| bitrate value in bits per second 275 uint32_t A2DP_GetBitrateSbc(); 276 277 #endif // A2DP_SBC_H 278
