1 2 /* 3 * Copyright (C) 2016 BlueKitchen GmbH 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the copyright holders nor the names of 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 4. Any redistribution, use, or modification is done solely for 18 * personal benefit and not for any commercial purpose or for 19 * monetary gain. 20 * 21 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 25 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 28 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 31 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * Please inquire about commercial licensing options at 35 * [email protected] 36 * 37 */ 38 39 #define __BTSTACK_FILE__ "a2dp_source.c" 40 41 #include <stdint.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 #include "btstack.h" 47 #include "avdtp.h" 48 #include "avdtp_util.h" 49 #include "avdtp_source.h" 50 #include "a2dp_source.h" 51 52 #define AVDTP_MEDIA_PAYLOAD_HEADER_SIZE 12 53 54 static const char * default_a2dp_source_service_name = "BTstack A2DP Source Service"; 55 static const char * default_a2dp_source_service_provider_name = "BTstack A2DP Source Service Provider"; 56 static avdtp_context_t a2dp_source_context; 57 58 static a2dp_state_t app_state = A2DP_IDLE; 59 static avdtp_stream_endpoint_context_t sc; 60 static int next_remote_sep_index_to_query = 0; 61 62 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 63 64 void a2dp_source_create_sdp_record(uint8_t * service, uint32_t service_record_handle, uint16_t supported_features, const char * service_name, const char * service_provider_name){ 65 uint8_t* attribute; 66 de_create_sequence(service); 67 68 // 0x0000 "Service Record Handle" 69 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_SERVICE_RECORD_HANDLE); 70 de_add_number(service, DE_UINT, DE_SIZE_32, service_record_handle); 71 72 // 0x0001 "Service Class ID List" 73 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_SERVICE_CLASS_ID_LIST); 74 attribute = de_push_sequence(service); 75 { 76 de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_AUDIO_SOURCE); 77 } 78 de_pop_sequence(service, attribute); 79 80 // 0x0004 "Protocol Descriptor List" 81 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST); 82 attribute = de_push_sequence(service); 83 { 84 uint8_t* l2cpProtocol = de_push_sequence(attribute); 85 { 86 de_add_number(l2cpProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_L2CAP); 87 de_add_number(l2cpProtocol, DE_UINT, DE_SIZE_16, BLUETOOTH_PROTOCOL_AVDTP); 88 } 89 de_pop_sequence(attribute, l2cpProtocol); 90 91 uint8_t* avProtocol = de_push_sequence(attribute); 92 { 93 de_add_number(avProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_AVDTP); // avProtocol_service 94 de_add_number(avProtocol, DE_UINT, DE_SIZE_16, 0x0103); // version 95 } 96 de_pop_sequence(attribute, avProtocol); 97 } 98 de_pop_sequence(service, attribute); 99 100 // 0x0005 "Public Browse Group" 101 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_BROWSE_GROUP_LIST); // public browse group 102 attribute = de_push_sequence(service); 103 { 104 de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_PUBLIC_BROWSE_ROOT); 105 } 106 de_pop_sequence(service, attribute); 107 108 // 0x0009 "Bluetooth Profile Descriptor List" 109 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_BLUETOOTH_PROFILE_DESCRIPTOR_LIST); 110 attribute = de_push_sequence(service); 111 { 112 uint8_t *a2dProfile = de_push_sequence(attribute); 113 { 114 de_add_number(a2dProfile, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_ADVANCED_AUDIO_DISTRIBUTION); 115 de_add_number(a2dProfile, DE_UINT, DE_SIZE_16, 0x0103); 116 } 117 de_pop_sequence(attribute, a2dProfile); 118 } 119 de_pop_sequence(service, attribute); 120 121 122 // 0x0100 "Service Name" 123 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0100); 124 if (service_name){ 125 de_add_data(service, DE_STRING, strlen(service_name), (uint8_t *) service_name); 126 } else { 127 de_add_data(service, DE_STRING, strlen(default_a2dp_source_service_name), (uint8_t *) default_a2dp_source_service_name); 128 } 129 130 // 0x0100 "Provider Name" 131 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0102); 132 if (service_provider_name){ 133 de_add_data(service, DE_STRING, strlen(service_provider_name), (uint8_t *) service_provider_name); 134 } else { 135 de_add_data(service, DE_STRING, strlen(default_a2dp_source_service_provider_name), (uint8_t *) default_a2dp_source_service_provider_name); 136 } 137 138 // 0x0311 "Supported Features" 139 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0311); 140 de_add_number(service, DE_UINT, DE_SIZE_16, supported_features); 141 } 142 143 static inline uint16_t a2dp_cid(void){ 144 if (!sc.local_stream_endpoint) return 0; 145 if (!sc.local_stream_endpoint->connection) return 0; 146 return sc.local_stream_endpoint->connection->avdtp_cid; 147 } 148 149 static inline uint8_t local_seid(void){ 150 return avdtp_local_seid(sc.local_stream_endpoint); 151 } 152 153 static inline uint8_t remote_seid(void){ 154 return avdtp_remote_seid(sc.local_stream_endpoint); 155 } 156 157 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){ 158 if (!callback) return; 159 uint8_t event[8]; 160 int pos = 0; 161 event[pos++] = HCI_EVENT_A2DP_META; 162 event[pos++] = sizeof(event) - 2; 163 event[pos++] = A2DP_SUBEVENT_STREAM_ESTABLISHED; 164 little_endian_store_16(event, pos, cid); 165 pos += 2; 166 event[pos++] = local_seid; 167 event[pos++] = remote_seid; 168 event[pos++] = status; 169 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 170 } 171 172 static void a2dp_streaming_emit_can_send_media_packet_now(btstack_packet_handler_t callback, uint16_t cid, uint8_t seid){ 173 if (!callback) return; 174 uint8_t event[8]; 175 int pos = 0; 176 event[pos++] = HCI_EVENT_A2DP_META; 177 event[pos++] = sizeof(event) - 2; 178 event[pos++] = A2DP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW; 179 little_endian_store_16(event, pos, cid); 180 pos += 2; 181 event[pos++] = seid; 182 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 183 } 184 185 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 186 UNUSED(channel); 187 UNUSED(size); 188 189 uint8_t signal_identifier; 190 uint8_t status; 191 avdtp_sep_t sep; 192 uint8_t loc_seid; 193 uint8_t rem_seid; 194 uint16_t cid; 195 bd_addr_t address; 196 197 if (packet_type != HCI_EVENT_PACKET) return; 198 if (hci_event_packet_get_type(packet) != HCI_EVENT_AVDTP_META) return; 199 200 switch (packet[2]){ 201 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED: 202 // TODO cmp bt addr 203 avdtp_subevent_signaling_connection_established_get_bd_addr(packet, address); 204 if (memcmp(address, &sc.remote_addr, 6) != 0) break; 205 206 cid = avdtp_subevent_signaling_connection_established_get_avdtp_cid(packet); 207 status = avdtp_subevent_signaling_connection_established_get_status(packet); 208 if (status != 0){ 209 log_info("AVDTP_SUBEVENT_SIGNALING_CONNECTION failed status %d ---", status); 210 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, 0, 0, status); 211 break; 212 } 213 214 sc.active_remote_sep = NULL; 215 next_remote_sep_index_to_query = 0; 216 app_state = A2DP_W2_DISCOVER_SEPS; 217 log_info("AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED, avdtp cid 0x%02x ---", cid); 218 avdtp_source_discover_stream_endpoints(cid); 219 break; 220 221 case AVDTP_SUBEVENT_SIGNALING_SEP_FOUND: 222 // TODO check cid 223 if (app_state != A2DP_W2_DISCOVER_SEPS) return; 224 sep.seid = avdtp_subevent_signaling_sep_found_get_remote_seid(packet); 225 sep.in_use = avdtp_subevent_signaling_sep_found_get_in_use(packet); 226 sep.media_type = (avdtp_media_type_t) avdtp_subevent_signaling_sep_found_get_media_type(packet); 227 sep.type = (avdtp_sep_type_t) avdtp_subevent_signaling_sep_found_get_sep_type(packet); 228 log_info("found sep: seid %u, in_use %d, media type %d, sep type %d (1-SNK)", sep.seid, sep.in_use, sep.media_type, sep.type); 229 break; 230 231 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CAPABILITY:{ 232 // TODO check cid 233 if (!sc.local_stream_endpoint) return; 234 uint8_t sampling_frequency = avdtp_choose_sbc_sampling_frequency(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_sampling_frequency_bitmap(packet)); 235 uint8_t channel_mode = avdtp_choose_sbc_channel_mode(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_channel_mode_bitmap(packet)); 236 uint8_t block_length = avdtp_choose_sbc_block_length(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_block_length_bitmap(packet)); 237 uint8_t subbands = avdtp_choose_sbc_subbands(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_subbands_bitmap(packet)); 238 239 uint8_t allocation_method = avdtp_choose_sbc_allocation_method(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_allocation_method_bitmap(packet)); 240 uint8_t max_bitpool_value = avdtp_choose_sbc_max_bitpool_value(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_max_bitpool_value(packet)); 241 uint8_t min_bitpool_value = avdtp_choose_sbc_min_bitpool_value(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_min_bitpool_value(packet)); 242 243 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[0] = (sampling_frequency << 4) | channel_mode; 244 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[1] = (block_length << 4) | (subbands << 2) | allocation_method; 245 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[2] = min_bitpool_value; 246 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[3] = max_bitpool_value; 247 248 sc.local_stream_endpoint->remote_configuration_bitmap = store_bit16(sc.local_stream_endpoint->remote_configuration_bitmap, AVDTP_MEDIA_CODEC, 1); 249 sc.local_stream_endpoint->remote_configuration.media_codec.media_type = AVDTP_AUDIO; 250 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_type = AVDTP_CODEC_SBC; 251 252 app_state = A2DP_W2_SET_CONFIGURATION; 253 break; 254 } 255 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CAPABILITY: 256 log_info("received non SBC codec. not implemented"); 257 break; 258 259 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION:{ 260 // TODO check cid 261 sc.sampling_frequency = avdtp_subevent_signaling_media_codec_sbc_configuration_get_sampling_frequency(packet); 262 sc.block_length = avdtp_subevent_signaling_media_codec_sbc_configuration_get_block_length(packet); 263 sc.subbands = avdtp_subevent_signaling_media_codec_sbc_configuration_get_subbands(packet); 264 sc.allocation_method = avdtp_subevent_signaling_media_codec_sbc_configuration_get_allocation_method(packet) - 1; 265 sc.max_bitpool_value = avdtp_subevent_signaling_media_codec_sbc_configuration_get_max_bitpool_value(packet); 266 // TODO: deal with reconfigure: avdtp_subevent_signaling_media_codec_sbc_configuration_get_reconfigure(packet); 267 break; 268 } 269 case AVDTP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW: 270 a2dp_streaming_emit_can_send_media_packet_now(a2dp_source_context.a2dp_callback, a2dp_cid(), 0); 271 break; 272 273 case AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED: 274 status = avdtp_subevent_streaming_connection_established_get_status(packet); 275 cid = avdtp_subevent_streaming_connection_established_get_avdtp_cid(packet); 276 277 if (cid != a2dp_cid()){ 278 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, a2dp_cid(), local_seid(), remote_seid(), ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER); 279 break; 280 } 281 282 loc_seid = avdtp_subevent_streaming_connection_established_get_local_seid(packet); 283 if (loc_seid != local_seid()){ 284 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, a2dp_cid(), local_seid(), remote_seid(), ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER); 285 break; 286 } 287 288 rem_seid = avdtp_subevent_streaming_connection_established_get_remote_seid(packet); 289 if (status != 0){ 290 log_info("AVDTP_SUBEVENT_STREAMING_CONNECTION could not be established, status %d ---", status); 291 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, a2dp_cid(), local_seid(), rem_seid, status); 292 break; 293 } 294 295 app_state = A2DP_STREAMING_OPENED; 296 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, a2dp_cid(), local_seid(), remote_seid(), 0); 297 log_info("AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED --- avdtp_cid 0x%02x, local seid %d, remote seid %d", a2dp_cid(), local_seid(), remote_seid()); 298 break; 299 300 case AVDTP_SUBEVENT_SIGNALING_ACCEPT: 301 // TODO check cid 302 signal_identifier = avdtp_subevent_signaling_accept_get_signal_identifier(packet); 303 cid = avdtp_subevent_signaling_accept_get_avdtp_cid(packet); 304 log_info("Accepted %d", signal_identifier); 305 306 switch (app_state){ 307 case A2DP_W2_DISCOVER_SEPS: 308 app_state = A2DP_W2_GET_ALL_CAPABILITIES; 309 310 sc.active_remote_sep = avdtp_source_remote_sep(cid, next_remote_sep_index_to_query++); 311 if (!sc.active_remote_sep) { 312 app_state = A2DP_IDLE; 313 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, 0, 0, AVDTP_SEID_DOES_NOT_EXIST); 314 break; 315 } 316 log_info("Query get caps for seid %d", sc.active_remote_sep->seid); 317 avdtp_source_get_capabilities(cid, sc.active_remote_sep->seid); 318 break; 319 case A2DP_W2_GET_CAPABILITIES: 320 case A2DP_W2_GET_ALL_CAPABILITIES: 321 if (next_remote_sep_index_to_query < avdtp_source_remote_seps_num(cid)){ 322 sc.active_remote_sep = avdtp_source_remote_sep(cid, next_remote_sep_index_to_query++); 323 log_info("Query get caps for seid %d", sc.active_remote_sep->seid); 324 avdtp_source_get_capabilities(cid, sc.active_remote_sep->seid); 325 } else { 326 log_info("No more remote seps found"); 327 app_state = A2DP_IDLE; 328 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, 0, 0, AVDTP_SEID_DOES_NOT_EXIST); 329 } 330 break; 331 case A2DP_W2_SET_CONFIGURATION:{ 332 if (!sc.local_stream_endpoint) return; 333 app_state = A2DP_W2_GET_CONFIGURATION; 334 avdtp_source_set_configuration(cid, avdtp_stream_endpoint_seid(sc.local_stream_endpoint), sc.active_remote_sep->seid, sc.local_stream_endpoint->remote_configuration_bitmap, sc.local_stream_endpoint->remote_configuration); 335 break; 336 } 337 case A2DP_W2_GET_CONFIGURATION: 338 app_state = A2DP_W2_OPEN_STREAM_WITH_SEID; 339 avdtp_source_get_configuration(cid, sc.active_remote_sep->seid); 340 break; 341 case A2DP_W2_OPEN_STREAM_WITH_SEID:{ 342 app_state = A2DP_W4_OPEN_STREAM_WITH_SEID; 343 btstack_sbc_encoder_init(&sc.sbc_encoder_state, SBC_MODE_STANDARD, 344 sc.block_length, sc.subbands, 345 sc.allocation_method, sc.sampling_frequency, 346 sc.max_bitpool_value); 347 avdtp_source_open_stream(cid, avdtp_stream_endpoint_seid(sc.local_stream_endpoint), sc.active_remote_sep->seid); 348 break; 349 } 350 case A2DP_STREAMING_OPENED: 351 if (!a2dp_source_context.a2dp_callback) return; 352 switch (signal_identifier){ 353 case AVDTP_SI_START:{ 354 uint8_t event[6]; 355 int pos = 0; 356 event[pos++] = HCI_EVENT_A2DP_META; 357 event[pos++] = sizeof(event) - 2; 358 event[pos++] = A2DP_SUBEVENT_STREAM_STARTED; 359 little_endian_store_16(event, pos, a2dp_cid()); 360 pos += 2; 361 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 362 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 363 break; 364 } 365 case AVDTP_SI_SUSPEND:{ 366 uint8_t event[6]; 367 int pos = 0; 368 event[pos++] = HCI_EVENT_A2DP_META; 369 event[pos++] = sizeof(event) - 2; 370 event[pos++] = A2DP_SUBEVENT_STREAM_SUSPENDED; 371 little_endian_store_16(event, pos, a2dp_cid()); 372 pos += 2; 373 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 374 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 375 break; 376 } 377 case AVDTP_SI_ABORT: 378 case AVDTP_SI_CLOSE:{ 379 uint8_t event[6]; 380 int pos = 0; 381 event[pos++] = HCI_EVENT_A2DP_META; 382 event[pos++] = sizeof(event) - 2; 383 event[pos++] = A2DP_SUBEVENT_STREAM_RELEASED; 384 little_endian_store_16(event, pos, a2dp_cid()); 385 pos += 2; 386 log_info("send A2DP_SUBEVENT_STREAM_RELEASED to app"); 387 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 388 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 389 break; 390 } 391 default: 392 break; 393 } 394 break; 395 default: 396 app_state = A2DP_IDLE; 397 break; 398 } 399 400 break; 401 case AVDTP_SUBEVENT_SIGNALING_REJECT: 402 app_state = A2DP_IDLE; 403 signal_identifier = avdtp_subevent_signaling_reject_get_signal_identifier(packet); 404 log_info("Rejected %d", signal_identifier); 405 break; 406 case AVDTP_SUBEVENT_SIGNALING_GENERAL_REJECT: 407 app_state = A2DP_IDLE; 408 signal_identifier = avdtp_subevent_signaling_general_reject_get_signal_identifier(packet); 409 log_info("Rejected %d", signal_identifier); 410 break; 411 default: 412 app_state = A2DP_IDLE; 413 log_info("not implemented"); 414 break; 415 } 416 } 417 void a2dp_source_register_packet_handler(btstack_packet_handler_t callback){ 418 if (callback == NULL){ 419 log_error("a2dp_source_register_packet_handler called with NULL callback"); 420 return; 421 } 422 avdtp_source_register_packet_handler(&packet_handler); 423 a2dp_source_context.a2dp_callback = callback; 424 } 425 426 void a2dp_source_init(void){ 427 avdtp_source_init(&a2dp_source_context); 428 l2cap_register_service(&packet_handler, BLUETOOTH_PROTOCOL_AVDTP, 0xffff, LEVEL_0); 429 } 430 431 uint8_t a2dp_source_create_stream_endpoint(avdtp_media_type_t media_type, avdtp_media_codec_type_t media_codec_type, 432 uint8_t * codec_capabilities, uint16_t codec_capabilities_len, 433 uint8_t * media_codec_info, uint16_t media_codec_info_len){ 434 avdtp_stream_endpoint_t * local_stream_endpoint = avdtp_source_create_stream_endpoint(AVDTP_SOURCE, media_type); 435 avdtp_source_register_media_transport_category(avdtp_stream_endpoint_seid(local_stream_endpoint)); 436 avdtp_source_register_media_codec_category(avdtp_stream_endpoint_seid(local_stream_endpoint), media_type, media_codec_type, 437 codec_capabilities, codec_capabilities_len); 438 local_stream_endpoint->remote_configuration.media_codec.media_codec_information = media_codec_info; 439 local_stream_endpoint->remote_configuration.media_codec.media_codec_information_len = media_codec_info_len; 440 441 return local_stream_endpoint->sep.seid; 442 } 443 444 uint8_t a2dp_source_establish_stream(bd_addr_t remote_addr, uint8_t loc_seid, uint16_t * avdtp_cid){ 445 sc.local_stream_endpoint = avdtp_stream_endpoint_for_seid(loc_seid, &a2dp_source_context); 446 if (!sc.local_stream_endpoint){ 447 log_error(" no local_stream_endpoint for seid %d", loc_seid); 448 return AVDTP_SEID_DOES_NOT_EXIST; 449 } 450 memcpy(sc.remote_addr, remote_addr, 6); 451 return avdtp_source_connect(remote_addr, avdtp_cid); 452 } 453 454 uint8_t a2dp_source_disconnect(uint16_t avdtp_cid){ 455 return avdtp_disconnect(avdtp_cid, &a2dp_source_context); 456 } 457 458 uint8_t a2dp_source_start_stream(uint16_t avdtp_cid, uint8_t local_seid){ 459 return avdtp_start_stream(avdtp_cid, local_seid, &a2dp_source_context); 460 } 461 462 uint8_t a2dp_source_pause_stream(uint16_t avdtp_cid, uint8_t local_seid){ 463 return avdtp_suspend_stream(avdtp_cid, local_seid, &a2dp_source_context); 464 } 465 466 uint8_t a2dp_source_stream_endpoint_ready(uint16_t avdtp_cid, uint8_t local_seid){ 467 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 468 if (!stream_endpoint) { 469 log_error("No stream_endpoint with seid %d", local_seid); 470 return 0; 471 } 472 if (!stream_endpoint->connection || stream_endpoint->connection->avdtp_cid != avdtp_cid) return 0; 473 return (stream_endpoint->state == AVDTP_STREAM_ENDPOINT_STREAMING); 474 } 475 476 static void a2dp_source_setup_media_header(uint8_t * media_packet, int size, int *offset, uint8_t marker, uint16_t sequence_number){ 477 if (size < AVDTP_MEDIA_PAYLOAD_HEADER_SIZE){ 478 log_error("small outgoing buffer"); 479 return; 480 } 481 482 uint8_t rtp_version = 2; 483 uint8_t padding = 0; 484 uint8_t extension = 0; 485 uint8_t csrc_count = 0; 486 uint8_t payload_type = 0x60; 487 // uint16_t sequence_number = stream_endpoint->sequence_number; 488 uint32_t timestamp = btstack_run_loop_get_time_ms(); 489 uint32_t ssrc = 0x11223344; 490 491 // rtp header (min size 12B) 492 int pos = 0; 493 // int mtu = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 494 495 media_packet[pos++] = (rtp_version << 6) | (padding << 5) | (extension << 4) | csrc_count; 496 media_packet[pos++] = (marker << 1) | payload_type; 497 big_endian_store_16(media_packet, pos, sequence_number); 498 pos += 2; 499 big_endian_store_32(media_packet, pos, timestamp); 500 pos += 4; 501 big_endian_store_32(media_packet, pos, ssrc); // only used for multicast 502 pos += 4; 503 *offset = pos; 504 } 505 506 void a2dp_source_stream_endpoint_request_can_send_now(uint8_t local_seid){ 507 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 508 if (!stream_endpoint) { 509 log_error("no stream_endpoint for seid %d", local_seid); 510 return; 511 } 512 stream_endpoint->send_stream = 1; 513 avdtp_request_can_send_now_initiator(stream_endpoint->connection, stream_endpoint->l2cap_media_cid); 514 } 515 516 int a2dp_max_media_payload_size(uint8_t local_seid){ 517 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 518 if (!stream_endpoint) { 519 log_error("no stream_endpoint found for seid %d", local_seid); 520 return 0; 521 } 522 if (stream_endpoint->l2cap_media_cid == 0){ 523 log_error("no media cid found for seid %d", local_seid); 524 return 0; 525 } 526 return l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid) - AVDTP_MEDIA_PAYLOAD_HEADER_SIZE; 527 } 528 529 static void a2dp_source_copy_media_payload(uint8_t * media_packet, int size, int * offset, uint8_t * storage, int num_bytes_to_copy, uint8_t num_frames){ 530 if (size < num_bytes_to_copy + 1){ 531 log_error("small outgoing buffer: buffer size %u, but need %u", size, num_bytes_to_copy + 1); 532 return; 533 } 534 535 int pos = *offset; 536 media_packet[pos++] = num_frames; // (fragmentation << 7) | (starting_packet << 6) | (last_packet << 5) | num_frames; 537 memcpy(media_packet + pos, storage, num_bytes_to_copy); 538 pos += num_bytes_to_copy; 539 *offset = pos; 540 } 541 542 int a2dp_source_stream_send_media_payload(uint8_t local_seid, uint8_t * storage, int num_bytes_to_copy, uint8_t num_frames, uint8_t marker){ 543 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 544 if (!stream_endpoint) { 545 log_error("no stream_endpoint found for seid %d", local_seid); 546 return 0; 547 } 548 549 if (stream_endpoint->l2cap_media_cid == 0){ 550 log_error("no media cid found for seid %d", local_seid); 551 return 0; 552 } 553 554 int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 555 int offset = 0; 556 557 l2cap_reserve_packet_buffer(); 558 uint8_t * media_packet = l2cap_get_outgoing_buffer(); 559 //int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 560 a2dp_source_setup_media_header(media_packet, size, &offset, marker, stream_endpoint->sequence_number); 561 a2dp_source_copy_media_payload(media_packet, size, &offset, storage, num_bytes_to_copy, num_frames); 562 stream_endpoint->sequence_number++; 563 l2cap_send_prepared(stream_endpoint->l2cap_media_cid, offset); 564 return size; 565 } 566