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 #include <unistd.h> 46 47 #include "btstack.h" 48 #include "avdtp.h" 49 #include "avdtp_util.h" 50 #include "avdtp_source.h" 51 #include "a2dp_source.h" 52 53 static const char * default_a2dp_source_service_name = "BTstack A2DP Source Service"; 54 static const char * default_a2dp_source_service_provider_name = "BTstack A2DP Source Service Provider"; 55 static avdtp_context_t a2dp_source_context; 56 57 #define AVDTP_MEDIA_PAYLOAD_HEADER_SIZE 12 58 59 typedef struct { 60 // to app 61 uint32_t fill_audio_ring_buffer_timeout_ms; 62 uint32_t time_audio_data_sent; // ms 63 uint32_t acc_num_missed_samples; 64 uint32_t samples_ready; 65 btstack_timer_source_t fill_audio_ring_buffer_timer; 66 btstack_ring_buffer_t sbc_ring_buffer; 67 btstack_sbc_encoder_state_t sbc_encoder_state; 68 69 int reconfigure; 70 int num_channels; 71 int sampling_frequency; 72 int channel_mode; 73 int block_length; 74 int subbands; 75 int allocation_method; 76 int min_bitpool_value; 77 int max_bitpool_value; 78 avdtp_stream_endpoint_t * local_stream_endpoint; 79 avdtp_sep_t * active_remote_sep; 80 } avdtp_stream_endpoint_context_t; 81 82 static a2dp_state_t app_state = A2DP_IDLE; 83 static avdtp_stream_endpoint_context_t sc; 84 static uint16_t avdtp_cid = 0; 85 static int next_remote_sep_index_to_query = 0; 86 87 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 88 89 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){ 90 uint8_t* attribute; 91 de_create_sequence(service); 92 93 // 0x0000 "Service Record Handle" 94 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_SERVICE_RECORD_HANDLE); 95 de_add_number(service, DE_UINT, DE_SIZE_32, service_record_handle); 96 97 // 0x0001 "Service Class ID List" 98 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_SERVICE_CLASS_ID_LIST); 99 attribute = de_push_sequence(service); 100 { 101 de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_AUDIO_SOURCE); 102 } 103 de_pop_sequence(service, attribute); 104 105 // 0x0004 "Protocol Descriptor List" 106 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST); 107 attribute = de_push_sequence(service); 108 { 109 uint8_t* l2cpProtocol = de_push_sequence(attribute); 110 { 111 de_add_number(l2cpProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_L2CAP); 112 de_add_number(l2cpProtocol, DE_UINT, DE_SIZE_16, BLUETOOTH_PROTOCOL_AVDTP); 113 } 114 de_pop_sequence(attribute, l2cpProtocol); 115 116 uint8_t* avProtocol = de_push_sequence(attribute); 117 { 118 de_add_number(avProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_AVDTP); // avProtocol_service 119 de_add_number(avProtocol, DE_UINT, DE_SIZE_16, 0x0103); // version 120 } 121 de_pop_sequence(attribute, avProtocol); 122 } 123 de_pop_sequence(service, attribute); 124 125 // 0x0005 "Public Browse Group" 126 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_BROWSE_GROUP_LIST); // public browse group 127 attribute = de_push_sequence(service); 128 { 129 de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_PUBLIC_BROWSE_ROOT); 130 } 131 de_pop_sequence(service, attribute); 132 133 // 0x0009 "Bluetooth Profile Descriptor List" 134 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_BLUETOOTH_PROFILE_DESCRIPTOR_LIST); 135 attribute = de_push_sequence(service); 136 { 137 uint8_t *a2dProfile = de_push_sequence(attribute); 138 { 139 de_add_number(a2dProfile, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_ADVANCED_AUDIO_DISTRIBUTION); 140 de_add_number(a2dProfile, DE_UINT, DE_SIZE_16, 0x0103); 141 } 142 de_pop_sequence(attribute, a2dProfile); 143 } 144 de_pop_sequence(service, attribute); 145 146 147 // 0x0100 "Service Name" 148 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0100); 149 if (service_name){ 150 de_add_data(service, DE_STRING, strlen(service_name), (uint8_t *) service_name); 151 } else { 152 de_add_data(service, DE_STRING, strlen(default_a2dp_source_service_name), (uint8_t *) default_a2dp_source_service_name); 153 } 154 155 // 0x0100 "Provider Name" 156 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0102); 157 if (service_provider_name){ 158 de_add_data(service, DE_STRING, strlen(service_provider_name), (uint8_t *) service_provider_name); 159 } else { 160 de_add_data(service, DE_STRING, strlen(default_a2dp_source_service_provider_name), (uint8_t *) default_a2dp_source_service_provider_name); 161 } 162 163 // 0x0311 "Supported Features" 164 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0311); 165 de_add_number(service, DE_UINT, DE_SIZE_16, supported_features); 166 } 167 168 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){ 169 if (!callback) return; 170 uint8_t event[8]; 171 int pos = 0; 172 event[pos++] = HCI_EVENT_A2DP_META; 173 event[pos++] = sizeof(event) - 2; 174 event[pos++] = A2DP_SUBEVENT_STREAM_ESTABLISHED; 175 little_endian_store_16(event, pos, cid); 176 pos += 2; 177 event[pos++] = local_seid; 178 event[pos++] = remote_seid; 179 event[pos++] = status; 180 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 181 } 182 183 static void a2dp_streaming_emit_can_send_media_packet_now(btstack_packet_handler_t callback, uint16_t cid, uint8_t seid){ 184 if (!callback) return; 185 uint8_t event[8]; 186 int pos = 0; 187 event[pos++] = HCI_EVENT_A2DP_META; 188 event[pos++] = sizeof(event) - 2; 189 event[pos++] = A2DP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW; 190 little_endian_store_16(event, pos, cid); 191 pos += 2; 192 event[pos++] = seid; 193 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 194 } 195 196 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 197 UNUSED(channel); 198 UNUSED(size); 199 200 uint8_t signal_identifier; 201 uint8_t status; 202 avdtp_sep_t sep; 203 uint8_t int_seid; 204 uint8_t acp_seid; 205 206 switch (packet_type) { 207 208 case HCI_EVENT_PACKET: 209 switch (hci_event_packet_get_type(packet)) { 210 case HCI_EVENT_DISCONNECTION_COMPLETE: 211 // connection closed -> quit test app 212 log_info("\n --- a2dp source --- HCI_EVENT_DISCONNECTION_COMPLETE ---"); 213 break; 214 case HCI_EVENT_AVDTP_META: 215 switch (packet[2]){ 216 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED: 217 avdtp_cid = avdtp_subevent_signaling_connection_established_get_avdtp_cid(packet); 218 status = avdtp_subevent_signaling_connection_established_get_status(packet); 219 if (status != 0){ 220 log_info(" --- a2dp source --- AVDTP_SUBEVENT_SIGNALING_CONNECTION could not be established, status %d ---", status); 221 break; 222 } 223 sc.active_remote_sep = NULL; 224 next_remote_sep_index_to_query = 0; 225 app_state = A2DP_W2_DISCOVER_SEPS; 226 log_info(" --- a2dp source --- AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED, avdtp cid 0x%02x ---", avdtp_cid); 227 avdtp_source_discover_stream_endpoints(avdtp_cid); 228 break; 229 230 case AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED: 231 status = avdtp_subevent_streaming_connection_established_get_status(packet); 232 avdtp_cid = avdtp_subevent_streaming_connection_established_get_avdtp_cid(packet); 233 int_seid = avdtp_subevent_streaming_connection_established_get_int_seid(packet); 234 acp_seid = avdtp_subevent_streaming_connection_established_get_acp_seid(packet); 235 236 if (status != 0){ 237 log_info(" --- a2dp source --- AVDTP_SUBEVENT_STREAMING_CONNECTION could not be established, status %d ---", status); 238 break; 239 } 240 app_state = A2DP_STREAMING_OPENED; 241 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, avdtp_cid, int_seid, acp_seid, 0); 242 log_info(" --- a2dp source --- AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED --- avdtp_cid 0x%02x, local seid %d, remote seid %d", avdtp_cid, int_seid, acp_seid); 243 break; 244 245 case AVDTP_SUBEVENT_SIGNALING_SEP_FOUND: 246 if (app_state != A2DP_W2_DISCOVER_SEPS) return; 247 sep.seid = avdtp_subevent_signaling_sep_found_get_seid(packet); 248 sep.in_use = avdtp_subevent_signaling_sep_found_get_in_use(packet); 249 sep.media_type = (avdtp_media_type_t) avdtp_subevent_signaling_sep_found_get_media_type(packet); 250 sep.type = (avdtp_sep_type_t) avdtp_subevent_signaling_sep_found_get_sep_type(packet); 251 log_info(" --- a2dp source --- 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); 252 break; 253 254 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CAPABILITY:{ 255 if (!sc.local_stream_endpoint) return; 256 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)); 257 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)); 258 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)); 259 uint8_t subbands = avdtp_choose_sbc_subbands(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_subbands_bitmap(packet)); 260 261 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)); 262 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)); 263 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)); 264 265 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[0] = (sampling_frequency << 4) | channel_mode; 266 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[1] = (block_length << 4) | (subbands << 2) | allocation_method; 267 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[2] = min_bitpool_value; 268 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[3] = max_bitpool_value; 269 270 sc.local_stream_endpoint->remote_configuration_bitmap = store_bit16(sc.local_stream_endpoint->remote_configuration_bitmap, AVDTP_MEDIA_CODEC, 1); 271 sc.local_stream_endpoint->remote_configuration.media_codec.media_type = AVDTP_AUDIO; 272 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_type = AVDTP_CODEC_SBC; 273 274 app_state = A2DP_W2_SET_CONFIGURATION; 275 break; 276 } 277 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CAPABILITY: 278 log_info(" --- a2dp source --- received non SBC codec. not implemented"); 279 break; 280 281 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION:{ 282 sc.sampling_frequency = avdtp_subevent_signaling_media_codec_sbc_configuration_get_sampling_frequency(packet); 283 sc.block_length = avdtp_subevent_signaling_media_codec_sbc_configuration_get_block_length(packet); 284 sc.subbands = avdtp_subevent_signaling_media_codec_sbc_configuration_get_subbands(packet); 285 sc.allocation_method = avdtp_subevent_signaling_media_codec_sbc_configuration_get_allocation_method(packet) - 1; 286 sc.max_bitpool_value = avdtp_subevent_signaling_media_codec_sbc_configuration_get_max_bitpool_value(packet); 287 // TODO: deal with reconfigure: avdtp_subevent_signaling_media_codec_sbc_configuration_get_reconfigure(packet); 288 break; 289 } 290 case AVDTP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW: 291 a2dp_streaming_emit_can_send_media_packet_now(a2dp_source_context.a2dp_callback, avdtp_cid, 0); 292 break; 293 294 case AVDTP_SUBEVENT_SIGNALING_ACCEPT: 295 signal_identifier = avdtp_subevent_signaling_accept_get_signal_identifier(packet); 296 status = avdtp_subevent_signaling_accept_get_status(packet); 297 log_info(" --- a2dp source --- Accepted %d", signal_identifier); 298 299 switch (app_state){ 300 case A2DP_W2_DISCOVER_SEPS: 301 app_state = A2DP_W2_GET_ALL_CAPABILITIES; 302 sc.active_remote_sep = avdtp_source_remote_sep(avdtp_cid, next_remote_sep_index_to_query++); 303 log_info(" --- a2dp source --- Query get caps for seid %d", sc.active_remote_sep->seid); 304 avdtp_source_get_capabilities(avdtp_cid, sc.active_remote_sep->seid); 305 break; 306 case A2DP_W2_GET_CAPABILITIES: 307 case A2DP_W2_GET_ALL_CAPABILITIES: 308 if (next_remote_sep_index_to_query < avdtp_source_remote_seps_num(avdtp_cid)){ 309 sc.active_remote_sep = avdtp_source_remote_sep(avdtp_cid, next_remote_sep_index_to_query++); 310 log_info(" --- a2dp source --- Query get caps for seid %d", sc.active_remote_sep->seid); 311 avdtp_source_get_capabilities(avdtp_cid, sc.active_remote_sep->seid); 312 } else { 313 log_info(" --- a2dp source --- No more remote seps found"); 314 app_state = A2DP_IDLE; 315 } 316 break; 317 case A2DP_W2_SET_CONFIGURATION:{ 318 if (!sc.local_stream_endpoint) return; 319 app_state = A2DP_W2_GET_CONFIGURATION; 320 avdtp_source_set_configuration(avdtp_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); 321 break; 322 } 323 case A2DP_W2_GET_CONFIGURATION: 324 app_state = A2DP_W2_OPEN_STREAM_WITH_SEID; 325 avdtp_source_get_configuration(avdtp_cid, sc.active_remote_sep->seid); 326 break; 327 case A2DP_W2_OPEN_STREAM_WITH_SEID:{ 328 app_state = A2DP_W4_OPEN_STREAM_WITH_SEID; 329 btstack_sbc_encoder_init(&sc.sbc_encoder_state, SBC_MODE_STANDARD, 330 sc.block_length, sc.subbands, 331 sc.allocation_method, sc.sampling_frequency, 332 sc.max_bitpool_value); 333 avdtp_source_open_stream(avdtp_cid, avdtp_stream_endpoint_seid(sc.local_stream_endpoint), sc.active_remote_sep->seid); 334 break; 335 } 336 case A2DP_STREAMING_OPENED: 337 if (!a2dp_source_context.a2dp_callback) return; 338 switch (signal_identifier){ 339 case AVDTP_SI_START:{ 340 uint8_t event[6]; 341 int pos = 0; 342 event[pos++] = HCI_EVENT_A2DP_META; 343 event[pos++] = sizeof(event) - 2; 344 event[pos++] = A2DP_SUBEVENT_STREAM_START_ACCEPTED; 345 little_endian_store_16(event, pos, avdtp_cid); 346 pos += 2; 347 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 348 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 349 break; 350 } 351 case AVDTP_SI_CLOSE:{ 352 uint8_t event[6]; 353 int pos = 0; 354 event[pos++] = HCI_EVENT_A2DP_META; 355 event[pos++] = sizeof(event) - 2; 356 event[pos++] = A2DP_SUBEVENT_STREAM_RELEASED; 357 little_endian_store_16(event, pos, avdtp_cid); 358 pos += 2; 359 log_info("send A2DP_SUBEVENT_STREAM_RELEASED to app"); 360 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 361 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 362 break; 363 } 364 case AVDTP_SI_SUSPEND:{ 365 uint8_t event[6]; 366 int pos = 0; 367 event[pos++] = HCI_EVENT_A2DP_META; 368 event[pos++] = sizeof(event) - 2; 369 event[pos++] = A2DP_SUBEVENT_STREAM_SUSPENDED; 370 little_endian_store_16(event, pos, avdtp_cid); 371 pos += 2; 372 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 373 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 374 break; 375 } 376 default: 377 break; 378 } 379 break; 380 default: 381 app_state = A2DP_IDLE; 382 break; 383 } 384 385 break; 386 case AVDTP_SUBEVENT_SIGNALING_REJECT: 387 app_state = A2DP_IDLE; 388 signal_identifier = avdtp_subevent_signaling_reject_get_signal_identifier(packet); 389 log_info(" --- a2dp source --- Rejected %d", signal_identifier); 390 break; 391 case AVDTP_SUBEVENT_SIGNALING_GENERAL_REJECT: 392 app_state = A2DP_IDLE; 393 signal_identifier = avdtp_subevent_signaling_general_reject_get_signal_identifier(packet); 394 log_info(" --- a2dp source --- Rejected %d", signal_identifier); 395 break; 396 default: 397 app_state = A2DP_IDLE; 398 log_info(" --- a2dp source --- not implemented"); 399 break; 400 } 401 break; 402 default: 403 break; 404 } 405 break; 406 default: 407 // other packet type 408 break; 409 } 410 } 411 void a2dp_source_register_packet_handler(btstack_packet_handler_t callback){ 412 if (callback == NULL){ 413 log_error("a2dp_source_register_packet_handler called with NULL callback"); 414 return; 415 } 416 avdtp_source_register_packet_handler(&packet_handler); 417 a2dp_source_context.a2dp_callback = callback; 418 } 419 420 void a2dp_source_init(void){ 421 avdtp_source_init(&a2dp_source_context); 422 l2cap_register_service(&packet_handler, BLUETOOTH_PROTOCOL_AVDTP, 0xffff, LEVEL_0); 423 } 424 425 uint8_t a2dp_source_create_stream_endpoint(avdtp_media_type_t media_type, avdtp_media_codec_type_t media_codec_type, 426 uint8_t * codec_capabilities, uint16_t codec_capabilities_len, 427 uint8_t * media_codec_info, uint16_t media_codec_info_len){ 428 avdtp_stream_endpoint_t * local_stream_endpoint = avdtp_source_create_stream_endpoint(AVDTP_SOURCE, media_type); 429 avdtp_source_register_media_transport_category(avdtp_stream_endpoint_seid(local_stream_endpoint)); 430 avdtp_source_register_media_codec_category(avdtp_stream_endpoint_seid(local_stream_endpoint), media_type, media_codec_type, 431 codec_capabilities, codec_capabilities_len); 432 local_stream_endpoint->remote_configuration.media_codec.media_codec_information = media_codec_info; 433 local_stream_endpoint->remote_configuration.media_codec.media_codec_information_len = media_codec_info_len; 434 435 return local_stream_endpoint->sep.seid; 436 } 437 438 void a2dp_source_establish_stream(bd_addr_t bd_addr, uint8_t local_seid){ 439 sc.local_stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 440 if (!sc.local_stream_endpoint){ 441 log_error(" no local_stream_endpoint for seid %d", local_seid); 442 return; 443 } 444 avdtp_source_connect(bd_addr); 445 } 446 447 void a2dp_source_disconnect(uint16_t con_handle){ 448 avdtp_disconnect(con_handle, &a2dp_source_context); 449 } 450 451 void a2dp_source_start_stream(uint8_t int_seid){ 452 avdtp_start_stream(int_seid, &a2dp_source_context); 453 } 454 455 void a2dp_source_release_stream(uint8_t int_seid){ 456 avdtp_stop_stream(int_seid, &a2dp_source_context); 457 } 458 459 void a2dp_source_pause_stream(uint8_t int_seid){ 460 avdtp_suspend_stream(int_seid, &a2dp_source_context); 461 } 462 463 uint8_t a2dp_source_stream_endpoint_ready(uint8_t local_seid){ 464 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 465 if (!stream_endpoint) { 466 log_error("No stream_endpoint with seid %d", local_seid); 467 return 0; 468 } 469 return (stream_endpoint->state == AVDTP_STREAM_ENDPOINT_STREAMING); 470 } 471 472 473 static void a2dp_source_setup_media_header(uint8_t * media_packet, int size, int *offset, uint8_t marker, uint16_t sequence_number){ 474 if (size < AVDTP_MEDIA_PAYLOAD_HEADER_SIZE){ 475 log_error("small outgoing buffer"); 476 return; 477 } 478 479 uint8_t rtp_version = 2; 480 uint8_t padding = 0; 481 uint8_t extension = 0; 482 uint8_t csrc_count = 0; 483 uint8_t payload_type = 0x60; 484 // uint16_t sequence_number = stream_endpoint->sequence_number; 485 uint32_t timestamp = btstack_run_loop_get_time_ms(); 486 uint32_t ssrc = 0x11223344; 487 488 // rtp header (min size 12B) 489 int pos = 0; 490 // int mtu = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 491 492 media_packet[pos++] = (rtp_version << 6) | (padding << 5) | (extension << 4) | csrc_count; 493 media_packet[pos++] = (marker << 1) | payload_type; 494 big_endian_store_16(media_packet, pos, sequence_number); 495 pos += 2; 496 big_endian_store_32(media_packet, pos, timestamp); 497 pos += 4; 498 big_endian_store_32(media_packet, pos, ssrc); // only used for multicast 499 pos += 4; 500 *offset = pos; 501 } 502 503 void a2dp_source_stream_endpoint_request_can_send_now(uint8_t local_seid){ 504 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 505 if (!stream_endpoint) { 506 log_error("no stream_endpoint for seid %d", local_seid); 507 return; 508 } 509 stream_endpoint->send_stream = 1; 510 avdtp_request_can_send_now_initiator(stream_endpoint->connection, stream_endpoint->l2cap_media_cid); 511 } 512 513 int a2dp_max_media_payload_size(uint8_t int_seid){ 514 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(int_seid, &a2dp_source_context); 515 if (!stream_endpoint) { 516 log_error("no stream_endpoint found for seid %d", int_seid); 517 return 0; 518 } 519 if (stream_endpoint->l2cap_media_cid == 0){ 520 log_error("no media cid found for seid %d", int_seid); 521 return 0; 522 } 523 return l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid) - AVDTP_MEDIA_PAYLOAD_HEADER_SIZE; 524 } 525 526 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){ 527 if (size < num_bytes_to_copy + 1){ 528 log_error("small outgoing buffer"); 529 return; 530 } 531 532 int pos = *offset; 533 media_packet[pos++] = num_frames; // (fragmentation << 7) | (starting_packet << 6) | (last_packet << 5) | num_frames; 534 memcpy(media_packet + pos, storage, num_bytes_to_copy); 535 pos += num_bytes_to_copy; 536 *offset = pos; 537 } 538 539 int a2dp_source_stream_send_media_payload(uint8_t int_seid, uint8_t * storage, int num_bytes_to_copy, uint8_t num_frames, uint8_t marker){ 540 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(int_seid, &a2dp_source_context); 541 if (!stream_endpoint) { 542 log_error("no stream_endpoint found for seid %d", int_seid); 543 return 0; 544 } 545 546 if (stream_endpoint->l2cap_media_cid == 0){ 547 log_error("no media cid found for seid %d", int_seid); 548 return 0; 549 } 550 551 int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 552 int offset = 0; 553 554 l2cap_reserve_packet_buffer(); 555 uint8_t * media_packet = l2cap_get_outgoing_buffer(); 556 //int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 557 a2dp_source_setup_media_header(media_packet, size, &offset, marker, stream_endpoint->sequence_number); 558 a2dp_source_copy_media_payload(media_packet, size, &offset, storage, num_bytes_to_copy, num_frames); 559 stream_endpoint->sequence_number++; 560 l2cap_send_prepared(stream_endpoint->l2cap_media_cid, offset); 561 return size; 562 } 563