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