1 /* 2 * Copyright (C) 2012 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 #ifndef ANDROID_INCLUDE_BT_AV_H 18 #define ANDROID_INCLUDE_BT_AV_H 19 20 #include <vector> 21 22 #include <hardware/bluetooth.h> 23 24 __BEGIN_DECLS 25 26 /* Bluetooth AV connection states */ 27 typedef enum { 28 BTAV_CONNECTION_STATE_DISCONNECTED = 0, 29 BTAV_CONNECTION_STATE_CONNECTING, 30 BTAV_CONNECTION_STATE_CONNECTED, 31 BTAV_CONNECTION_STATE_DISCONNECTING 32 } btav_connection_state_t; 33 34 /* Bluetooth AV datapath states */ 35 typedef enum { 36 BTAV_AUDIO_STATE_REMOTE_SUSPEND = 0, 37 BTAV_AUDIO_STATE_STOPPED, 38 BTAV_AUDIO_STATE_STARTED, 39 } btav_audio_state_t; 40 41 /* 42 * Enum values for each A2DP supported codec. 43 * There should be a separate entry for each A2DP codec that is supported 44 * for encoding (SRC), and for decoding purpose (SINK). 45 */ 46 typedef enum { 47 BTAV_A2DP_CODEC_INDEX_SOURCE_MIN = 0, 48 49 // Add an entry for each source codec here. 50 // NOTE: The values should be same as those listed in the following file: 51 // BluetoothCodecConfig.java 52 BTAV_A2DP_CODEC_INDEX_SOURCE_SBC = 0, 53 BTAV_A2DP_CODEC_INDEX_SOURCE_AAC, 54 BTAV_A2DP_CODEC_INDEX_SOURCE_APTX, 55 BTAV_A2DP_CODEC_INDEX_SOURCE_APTX_HD, 56 BTAV_A2DP_CODEC_INDEX_SOURCE_LDAC, 57 58 BTAV_A2DP_CODEC_INDEX_SOURCE_MAX, 59 60 BTAV_A2DP_CODEC_INDEX_SINK_MIN = BTAV_A2DP_CODEC_INDEX_SOURCE_MAX, 61 62 // Add an entry for each sink codec here 63 BTAV_A2DP_CODEC_INDEX_SINK_SBC = BTAV_A2DP_CODEC_INDEX_SINK_MIN, 64 BTAV_A2DP_CODEC_INDEX_SINK_AAC, 65 BTAV_A2DP_CODEC_INDEX_SINK_LDAC, 66 67 BTAV_A2DP_CODEC_INDEX_SINK_MAX, 68 69 BTAV_A2DP_CODEC_INDEX_MIN = BTAV_A2DP_CODEC_INDEX_SOURCE_MIN, 70 BTAV_A2DP_CODEC_INDEX_MAX = BTAV_A2DP_CODEC_INDEX_SINK_MAX 71 } btav_a2dp_codec_index_t; 72 73 typedef enum { 74 // Disable the codec. 75 // NOTE: This value can be used only during initialization when 76 // function btav_source_interface_t::init() is called. 77 BTAV_A2DP_CODEC_PRIORITY_DISABLED = -1, 78 79 // Reset the codec priority to its default value. 80 BTAV_A2DP_CODEC_PRIORITY_DEFAULT = 0, 81 82 // Highest codec priority. 83 BTAV_A2DP_CODEC_PRIORITY_HIGHEST = 1000 * 1000 84 } btav_a2dp_codec_priority_t; 85 86 typedef enum { 87 BTAV_A2DP_CODEC_SAMPLE_RATE_NONE = 0x0, 88 BTAV_A2DP_CODEC_SAMPLE_RATE_44100 = 0x1 << 0, 89 BTAV_A2DP_CODEC_SAMPLE_RATE_48000 = 0x1 << 1, 90 BTAV_A2DP_CODEC_SAMPLE_RATE_88200 = 0x1 << 2, 91 BTAV_A2DP_CODEC_SAMPLE_RATE_96000 = 0x1 << 3, 92 BTAV_A2DP_CODEC_SAMPLE_RATE_176400 = 0x1 << 4, 93 BTAV_A2DP_CODEC_SAMPLE_RATE_192000 = 0x1 << 5, 94 BTAV_A2DP_CODEC_SAMPLE_RATE_16000 = 0x1 << 6, 95 BTAV_A2DP_CODEC_SAMPLE_RATE_24000 = 0x1 << 7 96 } btav_a2dp_codec_sample_rate_t; 97 98 typedef enum { 99 BTAV_A2DP_CODEC_BITS_PER_SAMPLE_NONE = 0x0, 100 BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16 = 0x1 << 0, 101 BTAV_A2DP_CODEC_BITS_PER_SAMPLE_24 = 0x1 << 1, 102 BTAV_A2DP_CODEC_BITS_PER_SAMPLE_32 = 0x1 << 2 103 } btav_a2dp_codec_bits_per_sample_t; 104 105 typedef enum { 106 BTAV_A2DP_CODEC_CHANNEL_MODE_NONE = 0x0, 107 BTAV_A2DP_CODEC_CHANNEL_MODE_MONO = 0x1 << 0, 108 BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO = 0x1 << 1 109 } btav_a2dp_codec_channel_mode_t; 110 111 typedef enum { 112 BTAV_A2DP_SCMST_DISABLED = 0x00, 113 BTAV_A2DP_SCMST_ENABLED = 0x01 114 } btav_a2dp_scmst_enable_status_t; 115 116 /* 117 * Structure for representing codec capability or configuration. 118 * It is used for configuring A2DP codec preference, and for reporting back 119 * current configuration or codec capability. 120 * For codec capability, fields "sample_rate", "bits_per_sample" and 121 * "channel_mode" can contain bit-masks with all supported features. 122 */ 123 typedef struct { 124 btav_a2dp_codec_index_t codec_type; 125 btav_a2dp_codec_priority_t 126 codec_priority; // Codec selection priority 127 // relative to other codecs: larger value 128 // means higher priority. If 0, reset to 129 // default. 130 btav_a2dp_codec_sample_rate_t sample_rate; 131 btav_a2dp_codec_bits_per_sample_t bits_per_sample; 132 btav_a2dp_codec_channel_mode_t channel_mode; 133 int64_t codec_specific_1; // Codec-specific value 1 134 int64_t codec_specific_2; // Codec-specific value 2 135 int64_t codec_specific_3; // Codec-specific value 3 136 int64_t codec_specific_4; // Codec-specific value 4 137 ToString__anona323586a0908138 std::string ToString() const { 139 std::string codec_name_str; 140 141 switch (codec_type) { 142 case BTAV_A2DP_CODEC_INDEX_SOURCE_SBC: 143 codec_name_str = "SBC"; 144 break; 145 case BTAV_A2DP_CODEC_INDEX_SOURCE_AAC: 146 codec_name_str = "AAC"; 147 break; 148 case BTAV_A2DP_CODEC_INDEX_SOURCE_APTX: 149 codec_name_str = "aptX"; 150 break; 151 case BTAV_A2DP_CODEC_INDEX_SOURCE_APTX_HD: 152 codec_name_str = "aptX HD"; 153 break; 154 case BTAV_A2DP_CODEC_INDEX_SOURCE_LDAC: 155 codec_name_str = "LDAC"; 156 break; 157 case BTAV_A2DP_CODEC_INDEX_SINK_SBC: 158 codec_name_str = "SBC (Sink)"; 159 break; 160 case BTAV_A2DP_CODEC_INDEX_SINK_AAC: 161 codec_name_str = "AAC (Sink)"; 162 break; 163 case BTAV_A2DP_CODEC_INDEX_SINK_LDAC: 164 codec_name_str = "LDAC (Sink)"; 165 break; 166 case BTAV_A2DP_CODEC_INDEX_MAX: 167 codec_name_str = "Unknown(CODEC_INDEX_MAX)"; 168 break; 169 } 170 171 std::string sample_rate_str; 172 AppendCapability(sample_rate_str, 173 (sample_rate == BTAV_A2DP_CODEC_SAMPLE_RATE_NONE), "NONE"); 174 AppendCapability(sample_rate_str, 175 (sample_rate & BTAV_A2DP_CODEC_SAMPLE_RATE_44100), 176 "44100"); 177 AppendCapability(sample_rate_str, 178 (sample_rate & BTAV_A2DP_CODEC_SAMPLE_RATE_48000), 179 "48000"); 180 AppendCapability(sample_rate_str, 181 (sample_rate & BTAV_A2DP_CODEC_SAMPLE_RATE_88200), 182 "88200"); 183 AppendCapability(sample_rate_str, 184 (sample_rate & BTAV_A2DP_CODEC_SAMPLE_RATE_96000), 185 "96000"); 186 AppendCapability(sample_rate_str, 187 (sample_rate & BTAV_A2DP_CODEC_SAMPLE_RATE_176400), 188 "176400"); 189 AppendCapability(sample_rate_str, 190 (sample_rate & BTAV_A2DP_CODEC_SAMPLE_RATE_192000), 191 "192000"); 192 AppendCapability(sample_rate_str, 193 (sample_rate & BTAV_A2DP_CODEC_SAMPLE_RATE_16000), 194 "16000"); 195 AppendCapability(sample_rate_str, 196 (sample_rate & BTAV_A2DP_CODEC_SAMPLE_RATE_24000), 197 "24000"); 198 199 std::string bits_per_sample_str; 200 AppendCapability(bits_per_sample_str, 201 (bits_per_sample == BTAV_A2DP_CODEC_BITS_PER_SAMPLE_NONE), 202 "NONE"); 203 AppendCapability(bits_per_sample_str, 204 (bits_per_sample & BTAV_A2DP_CODEC_BITS_PER_SAMPLE_16), 205 "16"); 206 AppendCapability(bits_per_sample_str, 207 (bits_per_sample & BTAV_A2DP_CODEC_BITS_PER_SAMPLE_24), 208 "24"); 209 AppendCapability(bits_per_sample_str, 210 (bits_per_sample & BTAV_A2DP_CODEC_BITS_PER_SAMPLE_32), 211 "32"); 212 213 std::string channel_mode_str; 214 AppendCapability(channel_mode_str, 215 (channel_mode == BTAV_A2DP_CODEC_CHANNEL_MODE_NONE), 216 "NONE"); 217 AppendCapability(channel_mode_str, 218 (channel_mode & BTAV_A2DP_CODEC_CHANNEL_MODE_MONO), 219 "MONO"); 220 AppendCapability(channel_mode_str, 221 (channel_mode & BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO), 222 "STEREO"); 223 224 return "codec: " + codec_name_str + 225 " priority: " + std::to_string(codec_priority) + 226 " sample_rate: " + sample_rate_str + 227 " bits_per_sample: " + bits_per_sample_str + 228 " channel_mode: " + channel_mode_str + 229 " codec_specific_1: " + std::to_string(codec_specific_1) + 230 " codec_specific_2: " + std::to_string(codec_specific_2) + 231 " codec_specific_3: " + std::to_string(codec_specific_3) + 232 " codec_specific_4: " + std::to_string(codec_specific_4); 233 } 234 235 private: AppendCapability__anona323586a0908236 static std::string AppendCapability(std::string& result, bool append, 237 const std::string& name) { 238 if (!append) return result; 239 if (!result.empty()) result += "|"; 240 result += name; 241 return result; 242 } 243 } btav_a2dp_codec_config_t; 244 245 typedef struct { 246 btav_a2dp_scmst_enable_status_t enable_status; 247 uint8_t cp_header; 248 } btav_a2dp_scmst_info_t; 249 250 /** Callback for connection state change. 251 * state will have one of the values from btav_connection_state_t 252 */ 253 typedef void (*btav_connection_state_callback)(const RawAddress& bd_addr, 254 btav_connection_state_t state); 255 256 /** Callback for audiopath state change. 257 * state will have one of the values from btav_audio_state_t 258 */ 259 typedef void (*btav_audio_state_callback)(const RawAddress& bd_addr, 260 btav_audio_state_t state); 261 262 /** Callback for audio configuration change. 263 * Used only for the A2DP Source interface. 264 */ 265 typedef void (*btav_audio_source_config_callback)( 266 const RawAddress& bd_addr, btav_a2dp_codec_config_t codec_config, 267 std::vector<btav_a2dp_codec_config_t> codecs_local_capabilities, 268 std::vector<btav_a2dp_codec_config_t> codecs_selectable_capabilities); 269 270 /** Callback for audio configuration change. 271 * Used only for the A2DP Sink interface. 272 * sample_rate: sample rate in Hz 273 * channel_count: number of channels (1 for mono, 2 for stereo) 274 */ 275 typedef void (*btav_audio_sink_config_callback)(const RawAddress& bd_addr, 276 uint32_t sample_rate, 277 uint8_t channel_count); 278 279 /** Callback for querying whether the mandatory codec is more preferred. 280 * Used only for the A2DP Source interface. 281 * Return true if optional codecs are not preferred. 282 */ 283 typedef bool (*btav_mandatory_codec_preferred_callback)( 284 const RawAddress& bd_addr); 285 286 /** BT-AV A2DP Source callback structure. */ 287 typedef struct { 288 /** set to sizeof(btav_source_callbacks_t) */ 289 size_t size; 290 btav_connection_state_callback connection_state_cb; 291 btav_audio_state_callback audio_state_cb; 292 btav_audio_source_config_callback audio_config_cb; 293 btav_mandatory_codec_preferred_callback mandatory_codec_preferred_cb; 294 } btav_source_callbacks_t; 295 296 /** BT-AV A2DP Sink callback structure. */ 297 typedef struct { 298 /** set to sizeof(btav_sink_callbacks_t) */ 299 size_t size; 300 btav_connection_state_callback connection_state_cb; 301 btav_audio_state_callback audio_state_cb; 302 btav_audio_sink_config_callback audio_config_cb; 303 } btav_sink_callbacks_t; 304 305 /** 306 * NOTE: 307 * 308 * 1. AVRCP 1.0 shall be supported initially. AVRCP passthrough commands 309 * shall be handled internally via uinput 310 * 311 * 2. A2DP data path shall be handled via a socket pipe between the AudioFlinger 312 * android_audio_hw library and the Bluetooth stack. 313 * 314 */ 315 316 /** Represents the standard BT-AV A2DP Source interface. 317 */ 318 typedef struct { 319 /** set to sizeof(btav_source_interface_t) */ 320 size_t size; 321 /** 322 * Register the BtAv callbacks. 323 */ 324 bt_status_t (*init)( 325 btav_source_callbacks_t* callbacks, int max_connected_audio_devices, 326 const std::vector<btav_a2dp_codec_config_t>& codec_priorities, 327 const std::vector<btav_a2dp_codec_config_t>& offloading_preference); 328 329 /** connect to headset */ 330 bt_status_t (*connect)(const RawAddress& bd_addr); 331 332 /** dis-connect from headset */ 333 bt_status_t (*disconnect)(const RawAddress& bd_addr); 334 335 /** sets the connected device silence state */ 336 bt_status_t (*set_silence_device)(const RawAddress& bd_addr, bool silence); 337 338 /** sets the connected device as active */ 339 bt_status_t (*set_active_device)(const RawAddress& bd_addr); 340 341 /** configure the codecs settings preferences */ 342 bt_status_t (*config_codec)( 343 const RawAddress& bd_addr, 344 std::vector<btav_a2dp_codec_config_t> codec_preferences); 345 346 /** Closes the interface. */ 347 void (*cleanup)(void); 348 349 } btav_source_interface_t; 350 351 /** Represents the standard BT-AV A2DP Sink interface. 352 */ 353 typedef struct { 354 /** set to sizeof(btav_sink_interface_t) */ 355 size_t size; 356 /** 357 * Register the BtAv callbacks 358 */ 359 bt_status_t (*init)(btav_sink_callbacks_t* callbacks, 360 int max_connected_audio_devices); 361 362 /** connect to headset */ 363 bt_status_t (*connect)(const RawAddress& bd_addr); 364 365 /** dis-connect from headset */ 366 bt_status_t (*disconnect)(const RawAddress& bd_addr); 367 368 /** Closes the interface. */ 369 void (*cleanup)(void); 370 371 /** Sends Audio Focus State. */ 372 void (*set_audio_focus_state)(int focus_state); 373 374 /** Sets the audio track gain. */ 375 void (*set_audio_track_gain)(float gain); 376 377 /** sets the connected device as active */ 378 bt_status_t (*set_active_device)(const RawAddress& bd_addr); 379 } btav_sink_interface_t; 380 381 __END_DECLS 382 383 #endif /* ANDROID_INCLUDE_BT_AV_H */ 384