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 uint8_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, uint8_t * local_seid){ 167 *local_seid = 0; 168 avdtp_stream_endpoint_t * local_stream_endpoint = avdtp_sink_create_stream_endpoint(AVDTP_SINK, media_type); 169 if (!local_stream_endpoint){ 170 return BTSTACK_MEMORY_ALLOC_FAILED; 171 } 172 *local_seid = avdtp_local_seid(local_stream_endpoint); 173 avdtp_sink_register_media_transport_category(avdtp_stream_endpoint_seid(local_stream_endpoint)); 174 avdtp_sink_register_media_codec_category(avdtp_stream_endpoint_seid(local_stream_endpoint), media_type, media_codec_type, 175 codec_capabilities, codec_capabilities_len); 176 local_stream_endpoint->remote_configuration.media_codec.media_codec_information = media_codec_info; 177 local_stream_endpoint->remote_configuration.media_codec.media_codec_information_len = media_codec_info_len; 178 return ERROR_CODE_SUCCESS; 179 } 180 181 uint8_t a2dp_sink_establish_stream(bd_addr_t bd_addr, uint8_t local_seid, uint16_t * avdtp_cid){ 182 sc.local_stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_sink_context); 183 if (!sc.local_stream_endpoint){ 184 log_info("No local_stream_endpoint for seid %d", local_seid); 185 return AVDTP_SEID_DOES_NOT_EXIST; 186 } 187 // remember to tell client 188 send_stream_established_for_outgoing_connection = 1; 189 return avdtp_sink_connect(bd_addr, avdtp_cid); 190 } 191 192 void a2dp_sink_disconnect(uint16_t a2dp_cid){ 193 avdtp_disconnect(a2dp_cid, &a2dp_sink_context); 194 } 195 196 static inline void a2dp_signaling_emit_media_codec_sbc(btstack_packet_handler_t callback, uint8_t * event, uint16_t event_size){ 197 if (!callback) return; 198 if (event_size < 18) return; 199 event[0] = HCI_EVENT_A2DP_META; 200 event[2] = A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION; 201 (*callback)(HCI_EVENT_PACKET, 0, event, event_size); 202 } 203 204 static inline void avdtp_signaling_emit_media_codec_other(btstack_packet_handler_t callback, uint8_t * event, uint16_t event_size){ 205 if (!callback) return; 206 if (event_size < 113) return; 207 event[0] = HCI_EVENT_A2DP_META; 208 event[2] = A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CONFIGURATION; 209 } 210 211 static inline void a2dp_emit_stream_event(btstack_packet_handler_t callback, uint16_t a2dp_cid, uint8_t eventID, uint8_t local_seid){ 212 if (!callback) return; 213 uint8_t event[6]; 214 int pos = 0; 215 event[pos++] = HCI_EVENT_A2DP_META; 216 event[pos++] = sizeof(event) - 2; 217 event[pos++] = eventID; 218 little_endian_store_16(event, pos, a2dp_cid); 219 pos += 2; 220 event[pos++] = local_seid; 221 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 222 } 223 224 static inline void a2dp_emit_signaling_connection_released(btstack_packet_handler_t callback, uint16_t a2dp_cid){ 225 if (!callback) return; 226 uint8_t event[5]; 227 int pos = 0; 228 event[pos++] = HCI_EVENT_A2DP_META; 229 event[pos++] = sizeof(event) - 2; 230 event[pos++] = A2DP_SUBEVENT_SIGNALING_CONNECTION_RELEASED; 231 little_endian_store_16(event, pos, a2dp_cid); 232 pos += 2; 233 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 234 } 235 236 // static inline void a2dp_emit_cmd_accepted(btstack_packet_handler_t callback, uint8_t * packet, uint16_t size){ 237 // if (!callback) return; 238 // UNUSED(size); 239 // packet[0] = HCI_EVENT_A2DP_META; 240 // packet[2] = A2DP_SUBEVENT_COMMAND_ACCEPTED; 241 // (*callback)(HCI_EVENT_PACKET, 0, packet, size); 242 // } 243 244 static inline void a2dp_emit_cmd_rejected(btstack_packet_handler_t callback, uint8_t * packet, uint16_t size){ 245 if (!callback) return; 246 UNUSED(size); 247 packet[0] = HCI_EVENT_A2DP_META; 248 packet[2] = A2DP_SUBEVENT_COMMAND_REJECTED; 249 (*callback)(HCI_EVENT_PACKET, 0, packet, size); 250 } 251 252 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 253 UNUSED(channel); 254 UNUSED(size); 255 bd_addr_t address; 256 uint8_t status; 257 uint8_t signal_identifier; 258 uint16_t cid; 259 uint8_t loc_seid; 260 uint8_t rem_seid; 261 262 if (packet_type != HCI_EVENT_PACKET) return; 263 if (hci_event_packet_get_type(packet) != HCI_EVENT_AVDTP_META) return; 264 265 switch (packet[2]){ 266 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED: 267 avdtp_subevent_signaling_connection_established_get_bd_addr(packet, address); 268 cid = avdtp_subevent_signaling_connection_established_get_avdtp_cid(packet); 269 status = avdtp_subevent_signaling_connection_established_get_status(packet); 270 if (status != 0){ 271 app_state = A2DP_IDLE; 272 273 // only care for outgoing connections 274 if (send_stream_established_for_outgoing_connection == 0) break; 275 send_stream_established_for_outgoing_connection = 0; 276 277 log_info("AVDTP_SUBEVENT_SIGNALING_CONNECTION failed status %d ---", status); 278 a2dp_streaming_emit_connection_established(a2dp_sink_context.a2dp_callback, cid, address, 0, 0, status); 279 break; 280 } 281 app_state = A2DP_CONNECTED; 282 log_info("AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED, avdtp cid 0x%02x ---", cid); 283 break; 284 285 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CONFIGURATION: 286 log_info("received non SBC codec. not implemented"); 287 avdtp_signaling_emit_media_codec_other(a2dp_sink_context.a2dp_callback, packet, size); 288 break; 289 290 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION: 291 if (app_state < A2DP_CONNECTED) return; 292 a2dp_signaling_emit_media_codec_sbc(a2dp_sink_context.a2dp_callback, packet, size); 293 break; 294 295 case AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED: 296 avdtp_subevent_streaming_connection_established_get_bd_addr(packet, address); 297 status = avdtp_subevent_streaming_connection_established_get_status(packet); 298 cid = avdtp_subevent_streaming_connection_established_get_avdtp_cid(packet); 299 loc_seid = avdtp_subevent_streaming_connection_established_get_local_seid(packet); 300 rem_seid = avdtp_subevent_streaming_connection_established_get_remote_seid(packet); 301 log_info("AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED, avdtp cid 0x%02x, status %d ---", cid, status); 302 303 // about to notify client 304 send_stream_established_for_outgoing_connection = 0; 305 306 if (status){ 307 a2dp_streaming_emit_connection_established(a2dp_sink_context.a2dp_callback, cid, address, loc_seid, rem_seid, status); 308 break; 309 } 310 app_state = A2DP_STREAMING_OPENED; 311 a2dp_streaming_emit_connection_established(a2dp_sink_context.a2dp_callback, cid, address, loc_seid, rem_seid, 0); 312 break; 313 314 case AVDTP_SUBEVENT_SIGNALING_ACCEPT: 315 signal_identifier = avdtp_subevent_signaling_accept_get_signal_identifier(packet); 316 cid = avdtp_subevent_signaling_accept_get_avdtp_cid(packet); 317 loc_seid = avdtp_subevent_signaling_accept_get_local_seid(packet); 318 319 switch (signal_identifier){ 320 case AVDTP_SI_START: 321 a2dp_emit_stream_event(a2dp_sink_context.a2dp_callback, cid, A2DP_SUBEVENT_STREAM_STARTED, loc_seid); 322 break; 323 case AVDTP_SI_SUSPEND: 324 a2dp_emit_stream_event(a2dp_sink_context.a2dp_callback, cid, A2DP_SUBEVENT_STREAM_SUSPENDED, loc_seid); 325 break; 326 case AVDTP_SI_ABORT: 327 case AVDTP_SI_CLOSE: 328 a2dp_emit_stream_event(a2dp_sink_context.a2dp_callback, cid, A2DP_SUBEVENT_STREAM_STOPPED, loc_seid); 329 break; 330 default: 331 // a2dp_emit_cmd_accepted(a2dp_sink_context.a2dp_callback, packet, size); 332 break; 333 } 334 break; 335 336 case AVDTP_SUBEVENT_SIGNALING_REJECT: 337 case AVDTP_SUBEVENT_SIGNALING_GENERAL_REJECT: 338 signal_identifier = avdtp_subevent_signaling_accept_get_signal_identifier(packet); 339 cid = avdtp_subevent_signaling_accept_get_avdtp_cid(packet); 340 loc_seid = avdtp_subevent_signaling_accept_get_local_seid(packet); 341 a2dp_emit_cmd_rejected(a2dp_sink_context.a2dp_callback, packet, size); 342 app_state = A2DP_IDLE; 343 break; 344 case AVDTP_SUBEVENT_STREAMING_CONNECTION_RELEASED: 345 cid = avdtp_subevent_streaming_connection_released_get_avdtp_cid(packet); 346 loc_seid = avdtp_subevent_streaming_connection_released_get_local_seid(packet); 347 app_state = A2DP_IDLE; 348 a2dp_emit_stream_event(a2dp_sink_context.a2dp_callback, cid, A2DP_SUBEVENT_STREAM_RELEASED, loc_seid); 349 break; 350 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_RELEASED: 351 cid = avdtp_subevent_signaling_connection_released_get_avdtp_cid(packet); 352 353 // for outgoing connections, suppress release event and report stream established failed 354 if (send_stream_established_for_outgoing_connection){ 355 send_stream_established_for_outgoing_connection = 0; 356 log_info("A2DP sink outgoing connnection failed - disconnect"); 357 a2dp_streaming_emit_connection_established(a2dp_sink_context.a2dp_callback, cid, address, 0, 0, ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION); 358 break; 359 } 360 361 a2dp_emit_signaling_connection_released(a2dp_sink_context.a2dp_callback, cid); 362 app_state = A2DP_IDLE; 363 break; 364 default: 365 app_state = A2DP_IDLE; 366 log_info("not implemented"); 367 break; 368 } 369 370 } 371 372