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 } 142 143 144 static void a2dp_streaming_emit_can_send_media_packet_now(btstack_packet_handler_t callback, uint16_t cid, uint8_t seid){ 145 if (!callback) return; 146 uint8_t event[8]; 147 int pos = 0; 148 event[pos++] = HCI_EVENT_A2DP_META; 149 event[pos++] = sizeof(event) - 2; 150 event[pos++] = A2DP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW; 151 little_endian_store_16(event, pos, cid); 152 pos += 2; 153 event[pos++] = seid; 154 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 155 } 156 157 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 158 UNUSED(channel); 159 UNUSED(size); 160 161 uint8_t signal_identifier; 162 uint8_t status; 163 uint8_t local_seid; 164 uint8_t remote_seid; 165 uint16_t cid; 166 bd_addr_t address; 167 168 if (packet_type != HCI_EVENT_PACKET) return; 169 if (hci_event_packet_get_type(packet) != HCI_EVENT_AVDTP_META) return; 170 171 switch (packet[2]){ 172 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED: 173 avdtp_subevent_signaling_connection_established_get_bd_addr(packet, sc.remote_addr); 174 cid = avdtp_subevent_signaling_connection_established_get_avdtp_cid(packet); 175 status = avdtp_subevent_signaling_connection_established_get_status(packet); 176 if (status != 0){ 177 log_info("AVDTP_SUBEVENT_SIGNALING_CONNECTION failed status %d ---", status); 178 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, sc.remote_addr, 0, 0, status); 179 break; 180 } 181 182 sc.active_remote_sep = NULL; 183 next_remote_sep_index_to_query = 0; 184 if (!sc.local_stream_endpoint) { 185 app_state = A2DP_CONNECTED; 186 uint8_t event[11]; 187 int pos = 0; 188 event[pos++] = HCI_EVENT_A2DP_META; 189 event[pos++] = sizeof(event) - 2; 190 event[pos++] = A2DP_SUBEVENT_INCOMING_CONNECTION_ESTABLISHED; 191 little_endian_store_16(event, pos, cid); 192 pos += 2; 193 reverse_bd_addr(event+pos, sc.remote_addr); 194 pos += 6; 195 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 196 return; 197 } 198 199 app_state = A2DP_W2_DISCOVER_SEPS; 200 avdtp_source_discover_stream_endpoints(cid); 201 break; 202 203 case AVDTP_SUBEVENT_SIGNALING_SEP_FOUND: 204 break; 205 206 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CAPABILITY:{ 207 if (!sc.local_stream_endpoint) { 208 // printf("local seid %d \n", avdtp_subevent_signaling_media_codec_sbc_capability_get_local_seid(packet)); 209 return; 210 } 211 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)); 212 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)); 213 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)); 214 uint8_t subbands = avdtp_choose_sbc_subbands(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_subbands_bitmap(packet)); 215 216 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)); 217 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)); 218 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)); 219 220 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[0] = (sampling_frequency << 4) | channel_mode; 221 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[1] = (block_length << 4) | (subbands << 2) | allocation_method; 222 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[2] = min_bitpool_value; 223 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[3] = max_bitpool_value; 224 225 sc.local_stream_endpoint->remote_configuration_bitmap = store_bit16(sc.local_stream_endpoint->remote_configuration_bitmap, AVDTP_MEDIA_CODEC, 1); 226 sc.local_stream_endpoint->remote_configuration.media_codec.media_type = AVDTP_AUDIO; 227 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_type = AVDTP_CODEC_SBC; 228 229 app_state = A2DP_W2_SET_CONFIGURATION; 230 break; 231 } 232 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CAPABILITY: 233 log_info("received non SBC codec. not implemented"); 234 break; 235 236 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION:{ 237 // TODO check cid 238 sc.sampling_frequency = avdtp_subevent_signaling_media_codec_sbc_configuration_get_sampling_frequency(packet); 239 sc.block_length = avdtp_subevent_signaling_media_codec_sbc_configuration_get_block_length(packet); 240 sc.subbands = avdtp_subevent_signaling_media_codec_sbc_configuration_get_subbands(packet); 241 sc.allocation_method = avdtp_subevent_signaling_media_codec_sbc_configuration_get_allocation_method(packet) - 1; 242 sc.max_bitpool_value = avdtp_subevent_signaling_media_codec_sbc_configuration_get_max_bitpool_value(packet); 243 sc.channel_mode = avdtp_subevent_signaling_media_codec_sbc_configuration_get_channel_mode(packet); 244 // TODO: deal with reconfigure: avdtp_subevent_signaling_media_codec_sbc_configuration_get_reconfigure(packet); 245 break; 246 } 247 case AVDTP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW: 248 cid = avdtp_subevent_streaming_can_send_media_packet_now_get_avdtp_cid(packet); 249 a2dp_streaming_emit_can_send_media_packet_now(a2dp_source_context.a2dp_callback, cid, 0); 250 break; 251 252 case AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED: 253 avdtp_subevent_streaming_connection_established_get_bd_addr(packet, address); 254 status = avdtp_subevent_streaming_connection_established_get_status(packet); 255 cid = avdtp_subevent_streaming_connection_established_get_avdtp_cid(packet); 256 remote_seid = avdtp_subevent_streaming_connection_established_get_remote_seid(packet); 257 local_seid = avdtp_subevent_streaming_connection_established_get_local_seid(packet); 258 if (status != 0){ 259 log_info("AVDTP_SUBEVENT_STREAMING_CONNECTION could not be established, status %d ---", status); 260 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, address, local_seid, remote_seid, status); 261 break; 262 } 263 264 app_state = A2DP_STREAMING_OPENED; 265 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, address, local_seid, remote_seid, 0); 266 log_info("AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED --- avdtp_cid 0x%02x, local seid %d, remote seid %d", cid, local_seid, remote_seid); 267 break; 268 269 case AVDTP_SUBEVENT_SIGNALING_ACCEPT: 270 // TODO check cid 271 signal_identifier = avdtp_subevent_signaling_accept_get_signal_identifier(packet); 272 cid = avdtp_subevent_signaling_accept_get_avdtp_cid(packet); 273 log_info("Accepted %d", signal_identifier); 274 275 switch (app_state){ 276 case A2DP_W2_DISCOVER_SEPS: 277 app_state = A2DP_W2_GET_ALL_CAPABILITIES; 278 279 sc.active_remote_sep = avdtp_source_remote_sep(cid, next_remote_sep_index_to_query++); 280 if (!sc.active_remote_sep) { 281 app_state = A2DP_IDLE; 282 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, sc.remote_addr, 0, 0, AVDTP_SEID_DOES_NOT_EXIST); 283 break; 284 } 285 // printf("Query get caps for seid %d\n", sc.active_remote_sep->seid); 286 avdtp_source_get_capabilities(cid, sc.active_remote_sep->seid); 287 break; 288 case A2DP_W2_GET_CAPABILITIES: 289 case A2DP_W2_GET_ALL_CAPABILITIES: 290 if (next_remote_sep_index_to_query < avdtp_source_remote_seps_num(cid)){ 291 sc.active_remote_sep = avdtp_source_remote_sep(cid, next_remote_sep_index_to_query++); 292 // printf("Query get caps for seid %d\n", sc.active_remote_sep->seid); 293 avdtp_source_get_capabilities(cid, sc.active_remote_sep->seid); 294 } else { 295 // printf("No more remote seps found\n"); 296 app_state = A2DP_IDLE; 297 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, sc.remote_addr, 0, 0, AVDTP_SEID_DOES_NOT_EXIST); 298 } 299 break; 300 case A2DP_W2_SET_CONFIGURATION:{ 301 if (!sc.local_stream_endpoint) return; 302 app_state = A2DP_W2_GET_CONFIGURATION; 303 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); 304 break; 305 } 306 case A2DP_W2_GET_CONFIGURATION: 307 app_state = A2DP_W2_OPEN_STREAM_WITH_SEID; 308 avdtp_source_get_configuration(cid, sc.active_remote_sep->seid); 309 break; 310 case A2DP_W2_OPEN_STREAM_WITH_SEID:{ 311 app_state = A2DP_W4_OPEN_STREAM_WITH_SEID; 312 btstack_sbc_encoder_init(&sc.sbc_encoder_state, SBC_MODE_STANDARD, 313 sc.block_length, sc.subbands, 314 sc.allocation_method, sc.sampling_frequency, 315 sc.max_bitpool_value, 316 sc.channel_mode); 317 avdtp_source_open_stream(cid, avdtp_stream_endpoint_seid(sc.local_stream_endpoint), sc.active_remote_sep->seid); 318 break; 319 } 320 case A2DP_STREAMING_OPENED: 321 if (!a2dp_source_context.a2dp_callback) return; 322 switch (signal_identifier){ 323 case AVDTP_SI_START:{ 324 uint8_t event[6]; 325 int pos = 0; 326 event[pos++] = HCI_EVENT_A2DP_META; 327 event[pos++] = sizeof(event) - 2; 328 event[pos++] = A2DP_SUBEVENT_STREAM_STARTED; 329 little_endian_store_16(event, pos, cid); 330 pos += 2; 331 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 332 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 333 break; 334 } 335 case AVDTP_SI_SUSPEND:{ 336 uint8_t event[6]; 337 int pos = 0; 338 event[pos++] = HCI_EVENT_A2DP_META; 339 event[pos++] = sizeof(event) - 2; 340 event[pos++] = A2DP_SUBEVENT_STREAM_SUSPENDED; 341 little_endian_store_16(event, pos, cid); 342 pos += 2; 343 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 344 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 345 break; 346 } 347 case AVDTP_SI_ABORT: 348 case AVDTP_SI_CLOSE:{ 349 uint8_t event[6]; 350 int pos = 0; 351 event[pos++] = HCI_EVENT_A2DP_META; 352 event[pos++] = sizeof(event) - 2; 353 event[pos++] = A2DP_SUBEVENT_STREAM_STOPPED; 354 little_endian_store_16(event, pos, cid); 355 pos += 2; 356 log_info("send A2DP_SUBEVENT_STREAM_RELEASED to app"); 357 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 358 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 359 break; 360 } 361 default: 362 break; 363 } 364 break; 365 default: 366 app_state = A2DP_IDLE; 367 break; 368 } 369 370 break; 371 case AVDTP_SUBEVENT_SIGNALING_REJECT: 372 app_state = A2DP_IDLE; 373 signal_identifier = avdtp_subevent_signaling_reject_get_signal_identifier(packet); 374 log_info("Rejected %d", signal_identifier); 375 break; 376 case AVDTP_SUBEVENT_SIGNALING_GENERAL_REJECT: 377 app_state = A2DP_IDLE; 378 signal_identifier = avdtp_subevent_signaling_general_reject_get_signal_identifier(packet); 379 log_info("Rejected %d", signal_identifier); 380 break; 381 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_RELEASED:{ 382 app_state = A2DP_IDLE; 383 uint8_t event[6]; 384 int pos = 0; 385 event[pos++] = HCI_EVENT_A2DP_META; 386 event[pos++] = sizeof(event) - 2; 387 event[pos++] = A2DP_SUBEVENT_SIGNALING_CONNECTION_RELEASED; 388 little_endian_store_16(event, pos, avdtp_subevent_streaming_connection_released_get_avdtp_cid(packet)); 389 pos += 2; 390 event[pos++] = avdtp_subevent_streaming_connection_released_get_local_seid(packet); 391 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 392 break; 393 } 394 case AVDTP_SUBEVENT_STREAMING_CONNECTION_RELEASED:{ 395 app_state = A2DP_IDLE; 396 uint8_t event[6]; 397 int pos = 0; 398 event[pos++] = HCI_EVENT_A2DP_META; 399 event[pos++] = sizeof(event) - 2; 400 event[pos++] = A2DP_SUBEVENT_STREAM_RELEASED; 401 little_endian_store_16(event, pos, avdtp_subevent_streaming_connection_released_get_avdtp_cid(packet)); 402 pos += 2; 403 event[pos++] = avdtp_subevent_streaming_connection_released_get_local_seid(packet); 404 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 405 break; 406 } 407 default: 408 app_state = A2DP_IDLE; 409 log_info("not implemented"); 410 break; 411 } 412 } 413 void a2dp_source_register_packet_handler(btstack_packet_handler_t callback){ 414 if (callback == NULL){ 415 log_error("a2dp_source_register_packet_handler called with NULL callback"); 416 return; 417 } 418 avdtp_source_register_packet_handler(&packet_handler); 419 a2dp_source_context.a2dp_callback = callback; 420 } 421 422 void a2dp_source_init(void){ 423 avdtp_source_init(&a2dp_source_context); 424 l2cap_register_service(&packet_handler, BLUETOOTH_PROTOCOL_AVDTP, 0xffff, LEVEL_0); 425 } 426 427 avdtp_stream_endpoint_t * a2dp_source_create_stream_endpoint(avdtp_media_type_t media_type, avdtp_media_codec_type_t media_codec_type, 428 uint8_t * codec_capabilities, uint16_t codec_capabilities_len, 429 uint8_t * media_codec_info, uint16_t media_codec_info_len){ 430 avdtp_stream_endpoint_t * local_stream_endpoint = avdtp_source_create_stream_endpoint(AVDTP_SOURCE, media_type); 431 if (!local_stream_endpoint){ 432 return NULL; 433 } 434 avdtp_source_register_media_transport_category(avdtp_stream_endpoint_seid(local_stream_endpoint)); 435 avdtp_source_register_media_codec_category(avdtp_stream_endpoint_seid(local_stream_endpoint), media_type, media_codec_type, 436 codec_capabilities, codec_capabilities_len); 437 local_stream_endpoint->remote_configuration.media_codec.media_codec_information = media_codec_info; 438 local_stream_endpoint->remote_configuration.media_codec.media_codec_information_len = media_codec_info_len; 439 440 return local_stream_endpoint; 441 } 442 443 uint8_t a2dp_source_establish_stream(bd_addr_t remote_addr, uint8_t loc_seid, uint16_t * a2dp_cid){ 444 sc.local_stream_endpoint = avdtp_stream_endpoint_for_seid(loc_seid, &a2dp_source_context); 445 if (!sc.local_stream_endpoint){ 446 log_error(" no local_stream_endpoint for seid %d", loc_seid); 447 return AVDTP_SEID_DOES_NOT_EXIST; 448 } 449 memcpy(sc.remote_addr, remote_addr, 6); 450 return avdtp_source_connect(remote_addr, a2dp_cid); 451 } 452 453 uint8_t a2dp_source_disconnect(uint16_t a2dp_cid){ 454 return avdtp_disconnect(a2dp_cid, &a2dp_source_context); 455 } 456 457 uint8_t a2dp_source_start_stream(uint16_t a2dp_cid, uint8_t local_seid){ 458 return avdtp_start_stream(a2dp_cid, local_seid, &a2dp_source_context); 459 } 460 461 uint8_t a2dp_source_pause_stream(uint16_t a2dp_cid, uint8_t local_seid){ 462 return avdtp_suspend_stream(a2dp_cid, local_seid, &a2dp_source_context); 463 } 464 465 static void a2dp_source_setup_media_header(uint8_t * media_packet, int size, int *offset, uint8_t marker, uint16_t sequence_number){ 466 if (size < AVDTP_MEDIA_PAYLOAD_HEADER_SIZE){ 467 log_error("small outgoing buffer"); 468 return; 469 } 470 471 uint8_t rtp_version = 2; 472 uint8_t padding = 0; 473 uint8_t extension = 0; 474 uint8_t csrc_count = 0; 475 uint8_t payload_type = 0x60; 476 // uint16_t sequence_number = stream_endpoint->sequence_number; 477 uint32_t timestamp = btstack_run_loop_get_time_ms(); 478 uint32_t ssrc = 0x11223344; 479 480 // rtp header (min size 12B) 481 int pos = 0; 482 // int mtu = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 483 484 media_packet[pos++] = (rtp_version << 6) | (padding << 5) | (extension << 4) | csrc_count; 485 media_packet[pos++] = (marker << 1) | payload_type; 486 big_endian_store_16(media_packet, pos, sequence_number); 487 pos += 2; 488 big_endian_store_32(media_packet, pos, timestamp); 489 pos += 4; 490 big_endian_store_32(media_packet, pos, ssrc); // only used for multicast 491 pos += 4; 492 *offset = pos; 493 } 494 495 void a2dp_source_stream_endpoint_request_can_send_now(uint16_t a2dp_cid, uint8_t local_seid){ 496 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 497 if (!stream_endpoint) { 498 log_error("A2DP source: no stream_endpoint with seid %d", local_seid); 499 return; 500 } 501 if (a2dp_source_context.avdtp_cid != a2dp_cid){ 502 log_error("A2DP source: a2dp cid 0x%02x not known, expected 0x%02x", a2dp_cid, a2dp_source_context.avdtp_cid); 503 return; 504 } 505 stream_endpoint->send_stream = 1; 506 avdtp_request_can_send_now_initiator(stream_endpoint->connection, stream_endpoint->l2cap_media_cid); 507 } 508 509 int a2dp_max_media_payload_size(uint16_t a2dp_cid, uint8_t local_seid){ 510 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 511 if (!stream_endpoint) { 512 log_error("A2DP source: no stream_endpoint with seid %d", local_seid); 513 return 0; 514 } 515 if (a2dp_source_context.avdtp_cid != a2dp_cid){ 516 log_error("A2DP source: a2dp cid 0x%02x not known, expected 0x%02x", a2dp_cid, a2dp_source_context.avdtp_cid); 517 return 0; 518 } 519 520 if (stream_endpoint->l2cap_media_cid == 0){ 521 log_error("A2DP source: no media connection for seid %d", local_seid); 522 return 0; 523 } 524 return l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid) - AVDTP_MEDIA_PAYLOAD_HEADER_SIZE; 525 } 526 527 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){ 528 if (size < num_bytes_to_copy + 1){ 529 log_error("small outgoing buffer: buffer size %u, but need %u", size, num_bytes_to_copy + 1); 530 return; 531 } 532 533 int pos = *offset; 534 media_packet[pos++] = num_frames; // (fragmentation << 7) | (starting_packet << 6) | (last_packet << 5) | num_frames; 535 memcpy(media_packet + pos, storage, num_bytes_to_copy); 536 pos += num_bytes_to_copy; 537 *offset = pos; 538 } 539 540 int a2dp_source_stream_send_media_payload(uint16_t a2dp_cid, uint8_t local_seid, uint8_t * storage, int num_bytes_to_copy, uint8_t num_frames, uint8_t marker){ 541 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 542 if (!stream_endpoint) { 543 log_error("A2DP source: no stream_endpoint with seid %d", local_seid); 544 return 0; 545 } 546 if (a2dp_source_context.avdtp_cid != a2dp_cid){ 547 log_error("A2DP source: a2dp cid 0x%02x not known, expected 0x%02x", a2dp_cid, a2dp_source_context.avdtp_cid); 548 return 0; 549 } 550 551 if (stream_endpoint->l2cap_media_cid == 0){ 552 log_error("A2DP source: no media connection for seid %d", local_seid); 553 return 0; 554 } 555 556 int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 557 int offset = 0; 558 559 l2cap_reserve_packet_buffer(); 560 uint8_t * media_packet = l2cap_get_outgoing_buffer(); 561 //int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 562 a2dp_source_setup_media_header(media_packet, size, &offset, marker, stream_endpoint->sequence_number); 563 a2dp_source_copy_media_payload(media_packet, size, &offset, storage, num_bytes_to_copy, num_frames); 564 stream_endpoint->sequence_number++; 565 l2cap_send_prepared(stream_endpoint->l2cap_media_cid, offset); 566 return size; 567 } 568