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 "avdtp.h" 47 #include "avdtp_util.h" 48 #include "avdtp_sink.h" 49 #include "a2dp_sink.h" 50 51 static const char * default_a2dp_sink_service_name = "BTstack A2DP Sink Service"; 52 static const char * default_a2dp_sink_service_provider_name = "BTstack A2DP Sink Service Provider"; 53 54 static avdtp_context_t a2dp_sink_context; 55 56 static a2dp_state_t app_state = A2DP_IDLE; 57 static avdtp_stream_endpoint_context_t sc; 58 59 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 60 61 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){ 62 uint8_t* attribute; 63 de_create_sequence(service); 64 65 // 0x0000 "Service Record Handle" 66 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_SERVICE_RECORD_HANDLE); 67 de_add_number(service, DE_UINT, DE_SIZE_32, service_record_handle); 68 69 // 0x0001 "Service Class ID List" 70 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_SERVICE_CLASS_ID_LIST); 71 attribute = de_push_sequence(service); 72 { 73 de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_AUDIO_SINK); 74 } 75 de_pop_sequence(service, attribute); 76 77 // 0x0004 "Protocol Descriptor List" 78 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST); 79 attribute = de_push_sequence(service); 80 { 81 uint8_t* l2cpProtocol = de_push_sequence(attribute); 82 { 83 de_add_number(l2cpProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_L2CAP); 84 de_add_number(l2cpProtocol, DE_UINT, DE_SIZE_16, BLUETOOTH_PROTOCOL_AVDTP); 85 } 86 de_pop_sequence(attribute, l2cpProtocol); 87 88 uint8_t* avProtocol = de_push_sequence(attribute); 89 { 90 de_add_number(avProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_AVDTP); // avProtocol_service 91 de_add_number(avProtocol, DE_UINT, DE_SIZE_16, 0x0103); // version 92 } 93 de_pop_sequence(attribute, avProtocol); 94 } 95 de_pop_sequence(service, attribute); 96 97 // 0x0005 "Public Browse Group" 98 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_BROWSE_GROUP_LIST); // public browse group 99 attribute = de_push_sequence(service); 100 { 101 de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_PUBLIC_BROWSE_ROOT); 102 } 103 de_pop_sequence(service, attribute); 104 105 // 0x0009 "Bluetooth Profile Descriptor List" 106 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_BLUETOOTH_PROFILE_DESCRIPTOR_LIST); 107 attribute = de_push_sequence(service); 108 { 109 uint8_t *a2dProfile = de_push_sequence(attribute); 110 { 111 de_add_number(a2dProfile, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_ADVANCED_AUDIO_DISTRIBUTION); 112 de_add_number(a2dProfile, DE_UINT, DE_SIZE_16, 0x0103); 113 } 114 de_pop_sequence(attribute, a2dProfile); 115 } 116 de_pop_sequence(service, attribute); 117 118 119 // 0x0100 "Service Name" 120 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0100); 121 if (service_name){ 122 de_add_data(service, DE_STRING, strlen(service_name), (uint8_t *) service_name); 123 } else { 124 de_add_data(service, DE_STRING, strlen(default_a2dp_sink_service_name), (uint8_t *) default_a2dp_sink_service_name); 125 } 126 127 // 0x0100 "Provider Name" 128 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0102); 129 if (service_provider_name){ 130 de_add_data(service, DE_STRING, strlen(service_provider_name), (uint8_t *) service_provider_name); 131 } else { 132 de_add_data(service, DE_STRING, strlen(default_a2dp_sink_service_provider_name), (uint8_t *) default_a2dp_sink_service_provider_name); 133 } 134 135 // 0x0311 "Supported Features" 136 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0311); 137 de_add_number(service, DE_UINT, DE_SIZE_16, supported_features); 138 } 139 140 static inline uint16_t a2dp_cid(void){ 141 if (!sc.local_stream_endpoint) return 0; 142 if (!sc.local_stream_endpoint->connection) return 0; 143 return sc.local_stream_endpoint->connection->avdtp_cid; 144 } 145 146 static inline uint8_t local_seid(void){ 147 if (!sc.local_stream_endpoint) return 0; 148 return sc.local_stream_endpoint->sep.seid; 149 } 150 151 void a2dp_sink_register_packet_handler(btstack_packet_handler_t callback){ 152 // avdtp_sink_register_packet_handler(callback); 153 // return; 154 if (callback == NULL){ 155 log_error("a2dp_sink_register_packet_handler called with NULL callback"); 156 return; 157 } 158 avdtp_sink_register_packet_handler(&packet_handler); 159 a2dp_sink_context.a2dp_callback = callback; 160 } 161 162 void a2dp_sink_register_media_handler(void (*callback)(avdtp_stream_endpoint_t * stream_endpoint, uint8_t *packet, uint16_t size)){ 163 if (callback == NULL){ 164 log_error("a2dp_sink_register_media_handler called with NULL callback"); 165 return; 166 } 167 avdtp_sink_register_media_handler(callback); 168 } 169 170 void a2dp_sink_init(void){ 171 avdtp_sink_init(&a2dp_sink_context); 172 l2cap_register_service(&packet_handler, BLUETOOTH_PROTOCOL_AVDTP, 0xffff, LEVEL_0); 173 } 174 175 uint8_t a2dp_sink_create_stream_endpoint(avdtp_media_type_t media_type, avdtp_media_codec_type_t media_codec_type, 176 uint8_t * codec_capabilities, uint16_t codec_capabilities_len, 177 uint8_t * media_codec_info, uint16_t media_codec_info_len){ 178 avdtp_stream_endpoint_t * local_stream_endpoint = avdtp_sink_create_stream_endpoint(AVDTP_SINK, media_type); 179 avdtp_sink_register_media_transport_category(avdtp_stream_endpoint_seid(local_stream_endpoint)); 180 avdtp_sink_register_media_codec_category(avdtp_stream_endpoint_seid(local_stream_endpoint), media_type, media_codec_type, 181 codec_capabilities, codec_capabilities_len); 182 local_stream_endpoint->remote_configuration.media_codec.media_codec_information = media_codec_info; 183 local_stream_endpoint->remote_configuration.media_codec.media_codec_information_len = media_codec_info_len; 184 185 return local_stream_endpoint->sep.seid; 186 } 187 188 uint8_t a2dp_sink_establish_stream(bd_addr_t bd_addr, uint8_t local_seid, uint16_t * avdtp_cid){ 189 sc.local_stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_sink_context); 190 if (!sc.local_stream_endpoint){ 191 log_error(" no local_stream_endpoint for seid %d", local_seid); 192 return AVDTP_SEID_DOES_NOT_EXIST; 193 } 194 return avdtp_sink_connect(bd_addr, avdtp_cid); 195 } 196 197 void a2dp_sink_disconnect(uint16_t a2dp_cid){ 198 avdtp_disconnect(a2dp_cid, &a2dp_sink_context); 199 } 200 201 static void a2dp_streaming_emit_connection_established(btstack_packet_handler_t callback, uint16_t cid, uint8_t local_seid, uint8_t remote_seid, uint8_t status){ 202 if (!callback) return; 203 uint8_t event[8]; 204 int pos = 0; 205 event[pos++] = HCI_EVENT_A2DP_META; 206 event[pos++] = sizeof(event) - 2; 207 event[pos++] = A2DP_SUBEVENT_STREAM_ESTABLISHED; 208 little_endian_store_16(event, pos, cid); 209 pos += 2; 210 event[pos++] = local_seid; 211 event[pos++] = remote_seid; 212 event[pos++] = status; 213 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 214 } 215 216 static inline void a2dp_signaling_emit_media_codec_sbc(btstack_packet_handler_t callback, uint8_t * event, uint16_t event_size){ 217 if (!callback) return; 218 if (event_size < 18) return; 219 event[0] = HCI_EVENT_A2DP_META; 220 event[2] = A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION; 221 (*callback)(HCI_EVENT_PACKET, 0, event, event_size); 222 } 223 224 static inline void avdtp_signaling_emit_media_codec_other(btstack_packet_handler_t callback, uint8_t * event, uint16_t event_size){ 225 if (!callback) return; 226 if (event_size < 113) return; 227 event[0] = HCI_EVENT_A2DP_META; 228 event[2] = A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CONFIGURATION; 229 } 230 231 static inline void a2dp_emit_stream_event(btstack_packet_handler_t callback, uint16_t a2dp_cid, uint8_t eventID, uint8_t local_seid){ 232 if (!callback) return; 233 uint8_t event[6]; 234 int pos = 0; 235 event[pos++] = HCI_EVENT_A2DP_META; 236 event[pos++] = sizeof(event) - 2; 237 event[pos++] = eventID; 238 little_endian_store_16(event, pos, a2dp_cid); 239 pos += 2; 240 event[pos++] = local_seid; 241 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 242 } 243 244 static inline void a2dp_emit_cmd_accepted(btstack_packet_handler_t callback, uint8_t * packet, uint16_t size){ 245 if (!callback) return; 246 UNUSED(size); 247 packet[2] = A2DP_SUBEVENT_COMMAND_ACCEPTED; 248 (*callback)(HCI_EVENT_PACKET, 0, packet, size); 249 } 250 251 static inline void a2dp_emit_cmd_rejected(btstack_packet_handler_t callback, uint8_t * packet, uint16_t size){ 252 if (!callback) return; 253 UNUSED(size); 254 packet[2] = A2DP_SUBEVENT_COMMAND_REJECTED; 255 (*callback)(HCI_EVENT_PACKET, 0, packet, size); 256 } 257 258 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 259 UNUSED(channel); 260 UNUSED(size); 261 bd_addr_t address; 262 uint8_t status; 263 uint8_t signal_identifier; 264 uint16_t cid; 265 uint8_t loc_seid; 266 uint8_t rem_seid; 267 268 if (packet_type != HCI_EVENT_PACKET) return; 269 if (hci_event_packet_get_type(packet) != HCI_EVENT_AVDTP_META) return; 270 271 switch (packet[2]){ 272 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED: 273 avdtp_subevent_signaling_connection_established_get_bd_addr(packet, address); 274 if (memcmp(address, &sc.remote_addr, 6) != 0) break; 275 276 cid = avdtp_subevent_signaling_connection_established_get_avdtp_cid(packet); 277 status = avdtp_subevent_signaling_connection_established_get_status(packet); 278 if (status != 0){ 279 log_info("AVDTP_SUBEVENT_SIGNALING_CONNECTION failed status %d ---", status); 280 a2dp_streaming_emit_connection_established(a2dp_sink_context.a2dp_callback, cid, 0, 0, status); 281 break; 282 } 283 284 app_state = A2DP_CONNECTED; 285 log_info("AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED, avdtp cid 0x%02x ---", cid); 286 break; 287 288 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CONFIGURATION: 289 log_info("received non SBC codec. not implemented"); 290 avdtp_signaling_emit_media_codec_other(a2dp_sink_context.a2dp_callback, packet, size); 291 break; 292 293 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION: 294 if (app_state < A2DP_CONNECTED) return; 295 a2dp_signaling_emit_media_codec_sbc(a2dp_sink_context.a2dp_callback, packet, size); 296 break; 297 298 case AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED: 299 status = avdtp_subevent_streaming_connection_established_get_status(packet); 300 cid = avdtp_subevent_streaming_connection_established_get_avdtp_cid(packet); 301 loc_seid = avdtp_subevent_streaming_connection_established_get_local_seid(packet); 302 rem_seid = avdtp_subevent_streaming_connection_established_get_remote_seid(packet); 303 304 if (status != 0){ 305 a2dp_streaming_emit_connection_established(a2dp_sink_context.a2dp_callback, cid, loc_seid, rem_seid, status); 306 break; 307 } 308 309 if (cid != a2dp_cid()){ 310 a2dp_streaming_emit_connection_established(a2dp_sink_context.a2dp_callback, cid, loc_seid, rem_seid, ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER); 311 break; 312 } 313 314 if (loc_seid != local_seid()){ 315 a2dp_streaming_emit_connection_established(a2dp_sink_context.a2dp_callback, cid, loc_seid, rem_seid, ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER); 316 break; 317 } 318 app_state = A2DP_STREAMING_OPENED; 319 a2dp_streaming_emit_connection_established(a2dp_sink_context.a2dp_callback, cid, loc_seid, rem_seid, 0); 320 break; 321 322 case AVDTP_SUBEVENT_SIGNALING_ACCEPT: 323 signal_identifier = avdtp_subevent_signaling_accept_get_signal_identifier(packet); 324 cid = avdtp_subevent_signaling_accept_get_avdtp_cid(packet); 325 loc_seid = avdtp_subevent_signaling_accept_get_local_seid(packet); 326 327 switch (signal_identifier){ 328 case AVDTP_SI_START: 329 a2dp_emit_stream_event(a2dp_sink_context.a2dp_callback, cid, A2DP_SUBEVENT_STREAM_STARTED, loc_seid); 330 break; 331 case AVDTP_SI_SUSPEND: 332 a2dp_emit_stream_event(a2dp_sink_context.a2dp_callback, cid, A2DP_SUBEVENT_STREAM_SUSPENDED, loc_seid); 333 break; 334 case AVDTP_SI_ABORT: 335 case AVDTP_SI_CLOSE: 336 a2dp_emit_stream_event(a2dp_sink_context.a2dp_callback, cid, A2DP_SUBEVENT_STREAM_RELEASED, loc_seid); 337 break; 338 default: 339 a2dp_emit_cmd_accepted(a2dp_sink_context.a2dp_callback, packet, size); 340 break; 341 } 342 break; 343 344 case AVDTP_SUBEVENT_SIGNALING_REJECT: 345 case AVDTP_SUBEVENT_SIGNALING_GENERAL_REJECT: 346 signal_identifier = avdtp_subevent_signaling_accept_get_signal_identifier(packet); 347 cid = avdtp_subevent_signaling_accept_get_avdtp_cid(packet); 348 loc_seid = avdtp_subevent_signaling_accept_get_local_seid(packet); 349 a2dp_emit_cmd_rejected(a2dp_sink_context.a2dp_callback, packet, size); 350 break; 351 case AVDTP_SUBEVENT_STREAMING_CONNECTION_RELEASED: 352 cid = avdtp_subevent_streaming_connection_released_get_avdtp_cid(packet); 353 loc_seid = avdtp_subevent_streaming_connection_released_get_local_seid(packet); 354 app_state = A2DP_IDLE; 355 a2dp_emit_stream_event(a2dp_sink_context.a2dp_callback, cid, A2DP_SUBEVENT_STREAM_RELEASED, loc_seid); 356 break; 357 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_RELEASED: 358 app_state = A2DP_IDLE; 359 break; 360 default: 361 app_state = A2DP_IDLE; 362 log_info("not implemented"); 363 break; 364 } 365 366 } 367 368