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, const std::string& name, 36 btav_a2dp_codec_priority_t codec_priority, bool is_source) 37 : A2dpCodecConfig(codec_index, bluetooth::a2dp::CodecId::SBC, name, codec_priority), 38 is_source_(is_source) {} 39 tA2DP_STATUS setCodecConfig(const uint8_t* p_peer_codec_info, bool is_capability, 40 uint8_t* p_result_codec_config) override; 41 bool setPeerCodecCapabilities(const uint8_t* p_peer_codec_capabilities) override; 42 43 private: 44 bool is_source_; // True if local is Source 45 }; 46 47 class A2dpCodecConfigSbcSource : public A2dpCodecConfigSbcBase { 48 public: 49 A2dpCodecConfigSbcSource(btav_a2dp_codec_priority_t codec_priority); 50 virtual ~A2dpCodecConfigSbcSource(); 51 52 bool init() override; 53 54 private: 55 bool useRtpHeaderMarkerBit() const override; 56 void debug_codec_dump(int fd) override; 57 }; 58 59 class A2dpCodecConfigSbcSink : public A2dpCodecConfigSbcBase { 60 public: 61 A2dpCodecConfigSbcSink(btav_a2dp_codec_priority_t codec_priority); 62 virtual ~A2dpCodecConfigSbcSink(); 63 64 bool init() override; 65 66 private: 67 bool useRtpHeaderMarkerBit() const override; 68 }; 69 70 // Checks whether the codec capabilities contain a valid A2DP SBC Source codec. 71 // NOTE: only codecs that are implemented are considered valid. 72 // Returns true if |p_codec_info| contains information about a valid SBC codec, 73 // otherwise false. 74 bool A2DP_IsCodecValidSbc(const uint8_t* p_codec_info); 75 76 // Checks whether A2DP SBC Sink codec is supported. 77 // |p_codec_info| contains information about the codec capabilities. 78 // Returns true if the A2DP SBC Sink codec is supported, otherwise false. 79 tA2DP_STATUS A2DP_IsSinkCodecSupportedSbc(const uint8_t* p_codec_info); 80 81 // Initialize state with the default A2DP SBC codec. 82 // The initialized state with the codec capabilities is stored in 83 // |p_codec_info|. 84 void A2DP_InitDefaultCodecSbc(uint8_t* p_codec_info); 85 86 // Gets the A2DP SBC codec name for a given |p_codec_info|. 87 const char* A2DP_CodecNameSbc(const uint8_t* p_codec_info); 88 89 // Checks whether two A2DP SBC codecs |p_codec_info_a| and |p_codec_info_b| 90 // have the same type. 91 // Returns true if the two codecs have the same type, otherwise false. 92 bool A2DP_CodecTypeEqualsSbc(const uint8_t* p_codec_info_a, const uint8_t* p_codec_info_b); 93 94 // Checks whether two A2DP SBC codecs |p_codec_info_a| and |p_codec_info_b| 95 // are exactly the same. 96 // Returns true if the two codecs are exactly the same, otherwise false. 97 // If the codec type is not SBC, the return value is false. 98 bool A2DP_CodecEqualsSbc(const uint8_t* p_codec_info_a, const uint8_t* p_codec_info_b); 99 100 // Gets the track sample rate value for the A2DP SBC codec. 101 // |p_codec_info| is a pointer to the SBC codec_info to decode. 102 // Returns the track sample rate on success, or -1 if |p_codec_info| 103 // contains invalid codec information. 104 int A2DP_GetTrackSampleRateSbc(const uint8_t* p_codec_info); 105 106 // Gets the track bits per sample value for the A2DP SBC codec. 107 // |p_codec_info| is a pointer to the SBC codec_info to decode. 108 // Returns the track bits per sample on success, or -1 if |p_codec_info| 109 // contains invalid codec information. 110 int A2DP_GetTrackBitsPerSampleSbc(const uint8_t* p_codec_info); 111 112 // Gets the channel count for the A2DP SBC codec. 113 // |p_codec_info| is a pointer to the SBC codec_info to decode. 114 // Returns the channel count on success, or -1 if |p_codec_info| 115 // contains invalid codec information. 116 int A2DP_GetTrackChannelCountSbc(const uint8_t* p_codec_info); 117 118 // Gets the number of subbands for the A2DP SBC codec. 119 // |p_codec_info| is a pointer to the SBC codec_info to decode. 120 // Returns the number of subbands on success, or -1 if |p_codec_info| 121 // contains invalid codec information. 122 int A2DP_GetNumberOfSubbandsSbc(const uint8_t* p_codec_info); 123 124 // Gets the number of blocks for the A2DP SBC codec. 125 // |p_codec_info| is a pointer to the SBC codec_info to decode. 126 // Returns the number of blocks on success, or -1 if |p_codec_info| 127 // contains invalid codec information. 128 int A2DP_GetNumberOfBlocksSbc(const uint8_t* p_codec_info); 129 130 // Gets the allocation method code for the A2DP SBC codec. 131 // The actual value is codec-specific - see |A2DP_SBC_IE_ALLOC_MD_*|. 132 // |p_codec_info| is a pointer to the SBC codec_info to decode. 133 // Returns the allocation method code on success, or -1 if |p_codec_info| 134 // contains invalid codec information. 135 int A2DP_GetAllocationMethodCodeSbc(const uint8_t* p_codec_info); 136 137 // Gets the channel mode code for the A2DP SBC codec. 138 // The actual value is codec-specific - see |A2DP_SBC_IE_CH_MD_*|. 139 // |p_codec_info| is a pointer to the SBC codec_info to decode. 140 // Returns the channel mode code on success, or -1 if |p_codec_info| 141 // contains invalid codec information. 142 int A2DP_GetChannelModeCodeSbc(const uint8_t* p_codec_info); 143 144 // Gets the sampling frequency code for the A2DP SBC codec. 145 // The actual value is codec-specific - see |A2DP_SBC_IE_SAMP_FREQ_*|. 146 // |p_codec_info| is a pointer to the SBC codec_info to decode. 147 // Returns the sampling frequency code on success, or -1 if |p_codec_info| 148 // contains invalid codec information. 149 int A2DP_GetSamplingFrequencyCodeSbc(const uint8_t* p_codec_info); 150 151 // Gets the minimum bitpool for the A2DP SBC codec. 152 // The actual value is codec-specific - see |A2DP_SBC_IE_MIN_BITPOOL|. 153 // |p_codec_info| is a pointer to the SBC codec_info to decode. 154 // Returns the minimum bitpool on success, or -1 if |p_codec_info| 155 // contains invalid codec information. 156 int A2DP_GetMinBitpoolSbc(const uint8_t* p_codec_info); 157 158 // Gets the maximum bitpool for the A2DP SBC codec. 159 // The actual value is codec-specific - see |A2DP_SBC_IE_MAX_BITPOOL|. 160 // |p_codec_info| is a pointer to the SBC codec_info to decode. 161 // Returns the maximum bitpool on success, or -1 if |p_codec_info| 162 // contains invalid codec information. 163 int A2DP_GetMaxBitpoolSbc(const uint8_t* p_codec_info); 164 165 // Gets the channel type for the A2DP SBC Sink codec: 166 // 1 for mono, or 3 for dual/stereo/joint. 167 // |p_codec_info| is a pointer to the SBC codec_info to decode. 168 // Returns the channel type on success, or -1 if |p_codec_info| 169 // contains invalid codec information. 170 int A2DP_GetSinkTrackChannelTypeSbc(const uint8_t* p_codec_info); 171 172 // Gets the A2DP SBC audio data timestamp from an audio packet. 173 // |p_codec_info| contains the codec information. 174 // |p_data| contains the audio data. 175 // The timestamp is stored in |p_timestamp|. 176 // Returns true on success, otherwise false. 177 bool A2DP_GetPacketTimestampSbc(const uint8_t* p_codec_info, const uint8_t* p_data, 178 uint32_t* p_timestamp); 179 180 // Builds A2DP SBC codec header for audio data. 181 // |p_codec_info| contains the codec information. 182 // |p_buf| contains the audio data. 183 // |frames_per_packet| is the number of frames in this packet. 184 // Returns true on success, otherwise false. 185 bool A2DP_BuildCodecHeaderSbc(const uint8_t* p_codec_info, BT_HDR* p_buf, 186 uint16_t frames_per_packet); 187 188 // Decodes A2DP SBC codec info into a human readable string. 189 // |p_codec_info| is a pointer to the SBC codec_info to decode. 190 // Returns a string describing the codec information. 191 std::string A2DP_CodecInfoStringSbc(const uint8_t* p_codec_info); 192 193 // Gets the A2DP SBC encoder interface that can be used to encode and prepare 194 // A2DP packets for transmission - see |tA2DP_ENCODER_INTERFACE|. 195 // |p_codec_info| contains the codec information. 196 // Returns the A2DP SBC encoder interface if the |p_codec_info| is valid and 197 // supported, otherwise NULL. 198 const tA2DP_ENCODER_INTERFACE* A2DP_GetEncoderInterfaceSbc(const uint8_t* p_codec_info); 199 200 // Gets the A2DP SBC decoder interface that can be used to decode received A2DP 201 // packets - see |tA2DP_DECODER_INTERFACE|. 202 // |p_codec_info| contains the codec information. 203 // Returns the A2DP SBC decoder interface if the |p_codec_info| is valid and 204 // supported, otherwise NULL. 205 const tA2DP_DECODER_INTERFACE* A2DP_GetDecoderInterfaceSbc(const uint8_t* p_codec_info); 206 207 // Adjusts the A2DP SBC codec, based on local support and Bluetooth 208 // specification. 209 // |p_codec_info| contains the codec information to adjust. 210 // Returns true if |p_codec_info| is valid and supported, otherwise false. 211 bool A2DP_AdjustCodecSbc(uint8_t* p_codec_info); 212 213 // Gets the A2DP SBC Source codec index for a given |p_codec_info|. 214 // Returns the corresponding |btav_a2dp_codec_index_t| on success, 215 // otherwise |BTAV_A2DP_CODEC_INDEX_MAX|. 216 btav_a2dp_codec_index_t A2DP_SourceCodecIndexSbc(const uint8_t* p_codec_info); 217 218 // Gets the A2DP SBC Sink codec index for a given |p_codec_info|. 219 // Returns the corresponding |btav_a2dp_codec_index_t| on success, 220 // otherwise |BTAV_A2DP_CODEC_INDEX_MAX|. 221 btav_a2dp_codec_index_t A2DP_SinkCodecIndexSbc(const uint8_t* p_codec_info); 222 223 // Gets the A2DP SBC Source codec name. 224 const char* A2DP_CodecIndexStrSbc(void); 225 226 // Gets the A2DP SBC Sink codec name. 227 const char* A2DP_CodecIndexStrSbcSink(void); 228 229 // Initializes A2DP SBC Source codec information into |AvdtpSepConfig| 230 // configuration entry pointed by |p_cfg|. 231 bool A2DP_InitCodecConfigSbc(AvdtpSepConfig* p_cfg); 232 233 // Initializes A2DP SBC Sink codec information into |AvdtpSepConfig| 234 // configuration entry pointed by |p_cfg|. 235 bool A2DP_InitCodecConfigSbcSink(AvdtpSepConfig* p_cfg); 236 237 // Get SBC bitrate 238 // Returns |uint32_t| bitrate value in bits per second 239 uint32_t A2DP_GetBitrateSbc(); 240 241 #endif // A2DP_SBC_H 242