1 /* 2 * Copyright (C) 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 "a2dp_aac_constants.h" 25 #include "a2dp_codec_api.h" 26 #include "avdt_api.h" 27 28 class A2dpCodecConfigAac : public A2dpCodecConfig { 29 public: 30 A2dpCodecConfigAac(btav_a2dp_codec_priority_t codec_priority); 31 virtual ~A2dpCodecConfigAac(); 32 33 bool init() override; 34 period_ms_t encoderIntervalMs() const override; 35 bool setCodecConfig(const uint8_t* p_peer_codec_info, bool is_capability, 36 uint8_t* p_result_codec_config) override; 37 38 private: 39 bool useRtpHeaderMarkerBit() const override; 40 bool updateEncoderUserConfig( 41 const tA2DP_ENCODER_INIT_PEER_PARAMS* p_peer_params, 42 bool* p_restart_input, bool* p_restart_output, 43 bool* p_config_updated) override; 44 void debug_codec_dump(int fd) override; 45 }; 46 47 // Checks whether the codec capabilities contain a valid A2DP AAC Source 48 // codec. 49 // NOTE: only codecs that are implemented are considered valid. 50 // Returns true if |p_codec_info| contains information about a valid AAC 51 // codec, otherwise false. 52 bool A2DP_IsSourceCodecValidAac(const uint8_t* p_codec_info); 53 54 // Checks whether the codec capabilities contain a valid A2DP AAC Sink codec. 55 // NOTE: only codecs that are implemented are considered valid. 56 // Returns true if |p_codec_info| contains information about a valid AAC codec, 57 // otherwise false. 58 bool A2DP_IsSinkCodecValidAac(const uint8_t* p_codec_info); 59 60 // Checks whether the codec capabilities contain a valid peer A2DP AAC Source 61 // codec. 62 // NOTE: only codecs that are implemented are considered valid. 63 // Returns true if |p_codec_info| contains information about a valid AAC codec, 64 // otherwise false. 65 bool A2DP_IsPeerSourceCodecValidAac(const uint8_t* p_codec_info); 66 67 // Checks whether the codec capabilities contain a valid peer A2DP AAC Sink 68 // codec. 69 // NOTE: only codecs that are implemented are considered valid. 70 // Returns true if |p_codec_info| contains information about a valid AAC 71 // codec, otherwise false. 72 bool A2DP_IsPeerSinkCodecValidAac(const uint8_t* p_codec_info); 73 74 // Checks whether A2DP AAC Sink codec is supported. 75 // |p_codec_info| contains information about the codec capabilities. 76 // Returns true if the A2DP AAC Sink codec is supported, otherwise false. 77 bool A2DP_IsSinkCodecSupportedAac(const uint8_t* p_codec_info); 78 79 // Checks whether an A2DP AAC Source codec for a peer Source device is 80 // supported. 81 // |p_codec_info| contains information about the codec capabilities of the 82 // peer device. 83 // Returns true if the A2DP AAC Source codec for a peer Source device is 84 // supported, otherwise false. 85 bool A2DP_IsPeerSourceCodecSupportedAac(const uint8_t* p_codec_info); 86 87 // Checks whether the A2DP data packets should contain RTP header. 88 // |content_protection_enabled| is true if Content Protection is 89 // enabled. |p_codec_info| contains information about the codec capabilities. 90 // Returns true if the A2DP data packets should contain RTP header, otherwise 91 // false. 92 bool A2DP_UsesRtpHeaderAac(bool content_protection_enabled, 93 const uint8_t* p_codec_info); 94 95 // Builds A2DP preferred AAC Sink capability from AAC Source capability. 96 // |p_src_cap| is the Source capability to use. 97 // |p_pref_cfg| is the result Sink capability to store. 98 // Returns |A2DP_SUCCESS| on success, otherwise the corresponding A2DP error 99 // status code. 100 tA2DP_STATUS A2DP_BuildSrc2SinkConfigAac(const uint8_t* p_src_cap, 101 uint8_t* p_pref_cfg); 102 103 // Gets the A2DP AAC codec name for a given |p_codec_info|. 104 const char* A2DP_CodecNameAac(const uint8_t* p_codec_info); 105 106 // Checks whether two A2DP AAC codecs |p_codec_info_a| and |p_codec_info_b| 107 // have the same type. 108 // Returns true if the two codecs have the same type, otherwise false. 109 bool A2DP_CodecTypeEqualsAac(const uint8_t* p_codec_info_a, 110 const uint8_t* p_codec_info_b); 111 112 // Checks whether two A2DP AAC codecs |p_codec_info_a| and |p_codec_info_b| 113 // are exactly the same. 114 // Returns true if the two codecs are exactly the same, otherwise false. 115 // If the codec type is not AAC, the return value is false. 116 bool A2DP_CodecEqualsAac(const uint8_t* p_codec_info_a, 117 const uint8_t* p_codec_info_b); 118 119 // Gets the track sample rate value for the A2DP AAC codec. 120 // |p_codec_info| is a pointer to the AAC codec_info to decode. 121 // Returns the track sample rate on success, or -1 if |p_codec_info| 122 // contains invalid codec information. 123 int A2DP_GetTrackSampleRateAac(const uint8_t* p_codec_info); 124 125 // Gets the bits per audio sample for the A2DP AAC codec. 126 // |p_codec_info| is a pointer to the AAC codec_info to decode. 127 // Returns the bits per audio sample on success, or -1 if |p_codec_info| 128 // contains invalid codec information. 129 int A2DP_GetTrackBitsPerSampleAac(const uint8_t* p_codec_info); 130 131 // Gets the channel count for the A2DP AAC codec. 132 // |p_codec_info| is a pointer to the AAC codec_info to decode. 133 // Returns the channel count on success, or -1 if |p_codec_info| 134 // contains invalid codec information. 135 int A2DP_GetTrackChannelCountAac(const uint8_t* p_codec_info); 136 137 // Gets the channel type for the A2DP AAC Sink codec: 138 // 1 for mono, or 3 for dual/stereo/joint. 139 // |p_codec_info| is a pointer to the AAC codec_info to decode. 140 // Returns the channel type on success, or -1 if |p_codec_info| 141 // contains invalid codec information. 142 int A2DP_GetSinkTrackChannelTypeAac(const uint8_t* p_codec_info); 143 144 // Computes the number of frames to process in a time window for the A2DP 145 // AAC sink codec. |time_interval_ms| is the time interval (in milliseconds). 146 // |p_codec_info| is a pointer to the codec_info to decode. 147 // Returns the number of frames to process on success, or -1 if |p_codec_info| 148 // contains invalid codec information. 149 int A2DP_GetSinkFramesCountToProcessAac(uint64_t time_interval_ms, 150 const uint8_t* p_codec_info); 151 152 // Gets the object type code for the A2DP AAC codec. 153 // The actual value is codec-specific - see |A2DP_AAC_OBJECT_TYPE_*|. 154 // |p_codec_info| is a pointer to the AAC codec_info to decode. 155 // Returns the object type code on success, or -1 if |p_codec_info| 156 // contains invalid codec information. 157 int A2DP_GetObjectTypeCodeAac(const uint8_t* p_codec_info); 158 159 // Gets the channel mode code for the A2DP AAC codec. 160 // The actual value is codec-specific - see |A2DP_AAC_CHANNEL_MODE_*|. 161 // |p_codec_info| is a pointer to the AAC codec_info to decode. 162 // Returns the channel mode code on success, or -1 if |p_codec_info| 163 // contains invalid codec information. 164 int A2DP_GetChannelModeCodeAac(const uint8_t* p_codec_info); 165 166 // Gets the variable bit rate support for the A2DP AAC codec. 167 // The actual value is codec-specific - see |A2DP_AAC_VARIABLE_BIT_RATE_*|. 168 // |p_codec_info| is a pointer to the AAC codec_info to decode. 169 // Returns the variable bit rate support on success, or -1 if |p_codec_info| 170 // contains invalid codec information. 171 int A2DP_GetVariableBitRateSupportAac(const uint8_t* p_codec_info); 172 173 // Gets the bit rate for the A2DP AAC codec. 174 // The actual value is codec-specific - for AAC it is in bits per second. 175 // |p_codec_info| is a pointer to the AAC codec_info to decode. 176 // Returns the bit rate on success, or -1 if |p_codec_info| 177 // contains invalid codec information. 178 int A2DP_GetBitRateAac(const uint8_t* p_codec_info); 179 180 // Computes the maximum bit rate for the A2DP AAC codec based on the MTU. 181 // The actual value is codec-specific - for AAC it is in bits per second. 182 // |p_codec_info| is a pointer to the AAC codec_info to decode. 183 // |mtu| is the MTU to use for the computation. 184 // Returns the maximum bit rate on success, or -1 if |p_codec_info| 185 // contains invalid codec information. 186 int A2DP_ComputeMaxBitRateAac(const uint8_t* p_codec_info, uint16_t mtu); 187 188 // Gets the A2DP AAC audio data timestamp from an audio packet. 189 // |p_codec_info| contains the codec information. 190 // |p_data| contains the audio data. 191 // The timestamp is stored in |p_timestamp|. 192 // Returns true on success, otherwise false. 193 bool A2DP_GetPacketTimestampAac(const uint8_t* p_codec_info, 194 const uint8_t* p_data, uint32_t* p_timestamp); 195 196 // Builds A2DP AAC codec header for audio data. 197 // |p_codec_info| contains the codec information. 198 // |p_buf| contains the audio data. 199 // |frames_per_packet| is the number of frames in this packet. 200 // Returns true on success, otherwise false. 201 bool A2DP_BuildCodecHeaderAac(const uint8_t* p_codec_info, BT_HDR* p_buf, 202 uint16_t frames_per_packet); 203 204 // Decodes and displays AAC codec info (for debugging). 205 // |p_codec_info| is a pointer to the AAC codec_info to decode and display. 206 void A2DP_DumpCodecInfoAac(const uint8_t* p_codec_info); 207 208 // Gets the A2DP AAC encoder interface that can be used to encode and prepare 209 // A2DP packets for transmission - see |tA2DP_ENCODER_INTERFACE|. 210 // |p_codec_info| contains the codec information. 211 // Returns the A2DP AAC encoder interface if the |p_codec_info| is valid and 212 // supported, otherwise NULL. 213 const tA2DP_ENCODER_INTERFACE* A2DP_GetEncoderInterfaceAac( 214 const uint8_t* p_codec_info); 215 216 // Adjusts the A2DP AAC codec, based on local support and Bluetooth 217 // specification. 218 // |p_codec_info| contains the codec information to adjust. 219 // Returns true if |p_codec_info| is valid and supported, otherwise false. 220 bool A2DP_AdjustCodecAac(uint8_t* p_codec_info); 221 222 // Gets the A2DP AAC Source codec index for a given |p_codec_info|. 223 // Returns the corresponding |btav_a2dp_codec_index_t| on success, 224 // otherwise |BTAV_A2DP_CODEC_INDEX_MAX|. 225 btav_a2dp_codec_index_t A2DP_SourceCodecIndexAac(const uint8_t* p_codec_info); 226 227 // Gets the A2DP AAC Source codec name. 228 const char* A2DP_CodecIndexStrAac(void); 229 230 // Initializes A2DP AAC Source codec information into |tAVDT_CFG| 231 // configuration entry pointed by |p_cfg|. 232 bool A2DP_InitCodecConfigAac(tAVDT_CFG* p_cfg); 233 234 #endif // A2DP_AAC_H 235