1 /* 2 * Copyright (C) 2016 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "a2dp_sink.c" 39 40 #include <stdint.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "btstack.h" 46 #include "classic/avdtp_util.h" 47 #include "classic/avdtp_sink.h" 48 #include "classic/a2dp_sink.h" 49 50 static const char * default_a2dp_sink_service_name = "BTstack A2DP Sink Service"; 51 static const char * default_a2dp_sink_service_provider_name = "BTstack A2DP Sink Service Provider"; 52 53 static avdtp_context_t a2dp_sink_context; 54 55 static a2dp_state_t app_state = A2DP_IDLE; 56 static int send_stream_established_for_outgoing_connection; 57 58 static avdtp_stream_endpoint_context_t sc; 59 60 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 61 62 void a2dp_sink_create_sdp_record(uint8_t * service, uint32_t service_record_handle, uint16_t supported_features, const char * service_name, const char * service_provider_name){ 63 uint8_t* attribute; 64 de_create_sequence(service); 65 66 // 0x0000 "Service Record Handle" 67 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_SERVICE_RECORD_HANDLE); 68 de_add_number(service, DE_UINT, DE_SIZE_32, service_record_handle); 69 70 // 0x0001 "Service Class ID List" 71 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_SERVICE_CLASS_ID_LIST); 72 attribute = de_push_sequence(service); 73 { 74 de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_AUDIO_SINK); 75 } 76 de_pop_sequence(service, attribute); 77 78 // 0x0004 "Protocol Descriptor List" 79 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST); 80 attribute = de_push_sequence(service); 81 { 82 uint8_t* l2cpProtocol = de_push_sequence(attribute); 83 { 84 de_add_number(l2cpProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_L2CAP); 85 de_add_number(l2cpProtocol, DE_UINT, DE_SIZE_16, BLUETOOTH_PROTOCOL_AVDTP); 86 } 87 de_pop_sequence(attribute, l2cpProtocol); 88 89 uint8_t* avProtocol = de_push_sequence(attribute); 90 { 91 de_add_number(avProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_AVDTP); // avProtocol_service 92 de_add_number(avProtocol, DE_UINT, DE_SIZE_16, 0x0103); // version 93 } 94 de_pop_sequence(attribute, avProtocol); 95 } 96 de_pop_sequence(service, attribute); 97 98 // 0x0005 "Public Browse Group" 99 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_BROWSE_GROUP_LIST); // public browse group 100 attribute = de_push_sequence(service); 101 { 102 de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_PUBLIC_BROWSE_ROOT); 103 } 104 de_pop_sequence(service, attribute); 105 106 // 0x0009 "Bluetooth Profile Descriptor List" 107 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_BLUETOOTH_PROFILE_DESCRIPTOR_LIST); 108 attribute = de_push_sequence(service); 109 { 110 uint8_t *a2dProfile = de_push_sequence(attribute); 111 { 112 de_add_number(a2dProfile, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_ADVANCED_AUDIO_DISTRIBUTION); 113 de_add_number(a2dProfile, DE_UINT, DE_SIZE_16, 0x0103); 114 } 115 de_pop_sequence(attribute, a2dProfile); 116 } 117 de_pop_sequence(service, attribute); 118 119 120 // 0x0100 "Service Name" 121 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0100); 122 if (service_name){ 123 de_add_data(service, DE_STRING, strlen(service_name), (uint8_t *) service_name); 124 } else { 125 de_add_data(service, DE_STRING, strlen(default_a2dp_sink_service_name), (uint8_t *) default_a2dp_sink_service_name); 126 } 127 128 // 0x0100 "Provider Name" 129 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0102); 130 if (service_provider_name){ 131 de_add_data(service, DE_STRING, strlen(service_provider_name), (uint8_t *) service_provider_name); 132 } else { 133 de_add_data(service, DE_STRING, strlen(default_a2dp_sink_service_provider_name), (uint8_t *) default_a2dp_sink_service_provider_name); 134 } 135 136 // 0x0311 "Supported Features" 137 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0311); 138 de_add_number(service, DE_UINT, DE_SIZE_16, supported_features); 139 } 140 141 void a2dp_sink_register_packet_handler(btstack_packet_handler_t callback){ 142 // avdtp_sink_register_packet_handler(callback); 143 // return; 144 if (callback == NULL){ 145 log_error("a2dp_sink_register_packet_handler called with NULL callback"); 146 return; 147 } 148 avdtp_sink_register_packet_handler(&packet_handler); 149 a2dp_sink_context.a2dp_callback = callback; 150 } 151 152 void a2dp_sink_register_media_handler(void (*callback)(uint8_t local_seid, uint8_t *packet, uint16_t size)){ 153 if (callback == NULL){ 154 log_error("a2dp_sink_register_media_handler called with NULL callback"); 155 return; 156 } 157 avdtp_sink_register_media_handler(callback); 158 } 159 160 void a2dp_sink_init(void){ 161 avdtp_sink_init(&a2dp_sink_context); 162 } 163 164 avdtp_stream_endpoint_t * a2dp_sink_create_stream_endpoint(avdtp_media_type_t media_type, avdtp_media_codec_type_t media_codec_type, 165 uint8_t * codec_capabilities, uint16_t codec_capabilities_len, 166 uint8_t * media_codec_info, uint16_t media_codec_info_len){ 167 avdtp_stream_endpoint_t * local_stream_endpoint = avdtp_sink_create_stream_endpoint(AVDTP_SINK, media_type); 168 if (!local_stream_endpoint){ 169 return NULL; 170 } 171 avdtp_sink_register_media_transport_category(avdtp_stream_endpoint_seid(local_stream_endpoint)); 172 avdtp_sink_register_media_codec_category(avdtp_stream_endpoint_seid(local_stream_endpoint), media_type, media_codec_type, 173 codec_capabilities, codec_capabilities_len); 174 local_stream_endpoint->remote_configuration.media_codec.media_codec_information = media_codec_info; 175 local_stream_endpoint->remote_configuration.media_codec.media_codec_information_len = media_codec_info_len; 176 avdtp_sink_register_delay_reporting_category(avdtp_stream_endpoint_seid(local_stream_endpoint)); 177 return local_stream_endpoint; 178 } 179 180 uint8_t a2dp_sink_establish_stream(bd_addr_t bd_addr, uint8_t local_seid, uint16_t * avdtp_cid){ 181 sc.local_stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_sink_context); 182 if (!sc.local_stream_endpoint){ 183 log_info("No local_stream_endpoint for seid %d", local_seid); 184 return AVDTP_SEID_DOES_NOT_EXIST; 185 } 186 // remember to tell client 187 send_stream_established_for_outgoing_connection = 1; 188 return avdtp_sink_connect(bd_addr, avdtp_cid); 189 } 190 191 void a2dp_sink_disconnect(uint16_t a2dp_cid){ 192 avdtp_disconnect(a2dp_cid, &a2dp_sink_context); 193 } 194 195 static inline void a2dp_signaling_emit_media_codec_sbc(btstack_packet_handler_t callback, uint8_t * event, uint16_t event_size){ 196 if (!callback) return; 197 if (event_size < 18) return; 198 event[0] = HCI_EVENT_A2DP_META; 199 event[2] = A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION; 200 (*callback)(HCI_EVENT_PACKET, 0, event, event_size); 201 } 202 203 static inline void avdtp_signaling_emit_media_codec_other(btstack_packet_handler_t callback, uint8_t * event, uint16_t event_size){ 204 if (!callback) return; 205 if (event_size < 113) return; 206 event[0] = HCI_EVENT_A2DP_META; 207 event[2] = A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CONFIGURATION; 208 } 209 210 static inline void a2dp_emit_stream_event(btstack_packet_handler_t callback, uint16_t a2dp_cid, uint8_t eventID, uint8_t local_seid){ 211 if (!callback) return; 212 uint8_t event[6]; 213 int pos = 0; 214 event[pos++] = HCI_EVENT_A2DP_META; 215 event[pos++] = sizeof(event) - 2; 216 event[pos++] = eventID; 217 little_endian_store_16(event, pos, a2dp_cid); 218 pos += 2; 219 event[pos++] = local_seid; 220 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 221 } 222 223 static inline void a2dp_emit_signaling_connection_released(btstack_packet_handler_t callback, uint16_t a2dp_cid){ 224 if (!callback) return; 225 uint8_t event[5]; 226 int pos = 0; 227 event[pos++] = HCI_EVENT_A2DP_META; 228 event[pos++] = sizeof(event) - 2; 229 event[pos++] = A2DP_SUBEVENT_SIGNALING_CONNECTION_RELEASED; 230 little_endian_store_16(event, pos, a2dp_cid); 231 pos += 2; 232 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 233 } 234 235 // static inline void a2dp_emit_cmd_accepted(btstack_packet_handler_t callback, uint8_t * packet, uint16_t size){ 236 // if (!callback) return; 237 // UNUSED(size); 238 // packet[0] = HCI_EVENT_A2DP_META; 239 // packet[2] = A2DP_SUBEVENT_COMMAND_ACCEPTED; 240 // (*callback)(HCI_EVENT_PACKET, 0, packet, size); 241 // } 242 243 static inline void a2dp_emit_cmd_rejected(btstack_packet_handler_t callback, uint8_t * packet, uint16_t size){ 244 if (!callback) return; 245 UNUSED(size); 246 packet[0] = HCI_EVENT_A2DP_META; 247 packet[2] = A2DP_SUBEVENT_COMMAND_REJECTED; 248 (*callback)(HCI_EVENT_PACKET, 0, packet, size); 249 } 250 251 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 252 UNUSED(channel); 253 UNUSED(size); 254 bd_addr_t address; 255 uint8_t status; 256 uint8_t signal_identifier; 257 uint16_t cid; 258 uint8_t loc_seid; 259 uint8_t rem_seid; 260 261 if (packet_type != HCI_EVENT_PACKET) return; 262 if (hci_event_packet_get_type(packet) != HCI_EVENT_AVDTP_META) return; 263 264 switch (packet[2]){ 265 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED: 266 avdtp_subevent_signaling_connection_established_get_bd_addr(packet, address); 267 cid = avdtp_subevent_signaling_connection_established_get_avdtp_cid(packet); 268 status = avdtp_subevent_signaling_connection_established_get_status(packet); 269 if (status != 0){ 270 app_state = A2DP_IDLE; 271 272 // only care for outgoing connections 273 if (send_stream_established_for_outgoing_connection == 0) break; 274 send_stream_established_for_outgoing_connection = 0; 275 276 log_info("AVDTP_SUBEVENT_SIGNALING_CONNECTION failed status %d ---", status); 277 a2dp_streaming_emit_connection_established(a2dp_sink_context.a2dp_callback, cid, address, 0, 0, status); 278 break; 279 } 280 app_state = A2DP_CONNECTED; 281 log_info("AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED, avdtp cid 0x%02x ---", cid); 282 break; 283 284 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CONFIGURATION: 285 log_info("received non SBC codec. not implemented"); 286 avdtp_signaling_emit_media_codec_other(a2dp_sink_context.a2dp_callback, packet, size); 287 break; 288 289 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION: 290 if (app_state < A2DP_CONNECTED) return; 291 a2dp_signaling_emit_media_codec_sbc(a2dp_sink_context.a2dp_callback, packet, size); 292 break; 293 294 case AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED: 295 avdtp_subevent_streaming_connection_established_get_bd_addr(packet, address); 296 status = avdtp_subevent_streaming_connection_established_get_status(packet); 297 cid = avdtp_subevent_streaming_connection_established_get_avdtp_cid(packet); 298 loc_seid = avdtp_subevent_streaming_connection_established_get_local_seid(packet); 299 rem_seid = avdtp_subevent_streaming_connection_established_get_remote_seid(packet); 300 log_info("AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED, avdtp cid 0x%02x, status %d ---", cid, status); 301 302 // about to notify client 303 send_stream_established_for_outgoing_connection = 0; 304 305 if (status){ 306 a2dp_streaming_emit_connection_established(a2dp_sink_context.a2dp_callback, cid, address, loc_seid, rem_seid, status); 307 break; 308 } 309 app_state = A2DP_STREAMING_OPENED; 310 a2dp_streaming_emit_connection_established(a2dp_sink_context.a2dp_callback, cid, address, loc_seid, rem_seid, 0); 311 break; 312 313 case AVDTP_SUBEVENT_SIGNALING_ACCEPT: 314 signal_identifier = avdtp_subevent_signaling_accept_get_signal_identifier(packet); 315 cid = avdtp_subevent_signaling_accept_get_avdtp_cid(packet); 316 loc_seid = avdtp_subevent_signaling_accept_get_local_seid(packet); 317 318 switch (signal_identifier){ 319 case AVDTP_SI_START: 320 a2dp_emit_stream_event(a2dp_sink_context.a2dp_callback, cid, A2DP_SUBEVENT_STREAM_STARTED, loc_seid); 321 break; 322 case AVDTP_SI_SUSPEND: 323 a2dp_emit_stream_event(a2dp_sink_context.a2dp_callback, cid, A2DP_SUBEVENT_STREAM_SUSPENDED, loc_seid); 324 break; 325 case AVDTP_SI_ABORT: 326 case AVDTP_SI_CLOSE: 327 a2dp_emit_stream_event(a2dp_sink_context.a2dp_callback, cid, A2DP_SUBEVENT_STREAM_STOPPED, loc_seid); 328 break; 329 default: 330 // a2dp_emit_cmd_accepted(a2dp_sink_context.a2dp_callback, packet, size); 331 break; 332 } 333 break; 334 335 case AVDTP_SUBEVENT_SIGNALING_REJECT: 336 case AVDTP_SUBEVENT_SIGNALING_GENERAL_REJECT: 337 signal_identifier = avdtp_subevent_signaling_accept_get_signal_identifier(packet); 338 cid = avdtp_subevent_signaling_accept_get_avdtp_cid(packet); 339 loc_seid = avdtp_subevent_signaling_accept_get_local_seid(packet); 340 a2dp_emit_cmd_rejected(a2dp_sink_context.a2dp_callback, packet, size); 341 app_state = A2DP_IDLE; 342 break; 343 case AVDTP_SUBEVENT_STREAMING_CONNECTION_RELEASED: 344 cid = avdtp_subevent_streaming_connection_released_get_avdtp_cid(packet); 345 loc_seid = avdtp_subevent_streaming_connection_released_get_local_seid(packet); 346 app_state = A2DP_IDLE; 347 a2dp_emit_stream_event(a2dp_sink_context.a2dp_callback, cid, A2DP_SUBEVENT_STREAM_RELEASED, loc_seid); 348 break; 349 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_RELEASED: 350 cid = avdtp_subevent_signaling_connection_released_get_avdtp_cid(packet); 351 352 // for outgoing connections, suppress release event and report stream established failed 353 if (send_stream_established_for_outgoing_connection){ 354 send_stream_established_for_outgoing_connection = 0; 355 log_info("A2DP sink outgoing connnection failed - disconnect"); 356 a2dp_streaming_emit_connection_established(a2dp_sink_context.a2dp_callback, cid, address, 0, 0, ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION); 357 break; 358 } 359 360 a2dp_emit_signaling_connection_released(a2dp_sink_context.a2dp_callback, cid); 361 app_state = A2DP_IDLE; 362 break; 363 default: 364 app_state = A2DP_IDLE; 365 log_info("not implemented"); 366 break; 367 } 368 369 } 370 371