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 bd_addr_t event_addr; 201 uint8_t signal_identifier; 202 uint8_t status; 203 avdtp_sep_t sep; 204 uint8_t int_seid; 205 uint8_t acp_seid; 206 207 switch (packet_type) { 208 209 case HCI_EVENT_PACKET: 210 switch (hci_event_packet_get_type(packet)) { 211 case HCI_EVENT_PIN_CODE_REQUEST: 212 // inform about pin code request 213 printf("Pin code request - using '0000'\n"); 214 hci_event_pin_code_request_get_bd_addr(packet, event_addr); 215 hci_send_cmd(&hci_pin_code_request_reply, &event_addr, 4, "0000"); 216 break; 217 case HCI_EVENT_DISCONNECTION_COMPLETE: 218 // connection closed -> quit test app 219 printf("\n --- a2dp source --- HCI_EVENT_DISCONNECTION_COMPLETE ---\n"); 220 221 break; 222 case HCI_EVENT_AVDTP_META: 223 switch (packet[2]){ 224 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED: 225 avdtp_cid = avdtp_subevent_signaling_connection_established_get_avdtp_cid(packet); 226 status = avdtp_subevent_signaling_connection_established_get_status(packet); 227 if (status != 0){ 228 printf(" --- a2dp source --- AVDTP_SUBEVENT_SIGNALING_CONNECTION could not be established, status %d ---\n", status); 229 break; 230 } 231 sc.active_remote_sep = NULL; 232 next_remote_sep_index_to_query = 0; 233 app_state = A2DP_W2_DISCOVER_SEPS; 234 printf(" --- a2dp source --- AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED, avdtp cid 0x%02x ---\n", avdtp_cid); 235 avdtp_source_discover_stream_endpoints(avdtp_cid); 236 break; 237 238 case AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED: 239 status = avdtp_subevent_streaming_connection_established_get_status(packet); 240 avdtp_cid = avdtp_subevent_streaming_connection_established_get_avdtp_cid(packet); 241 int_seid = avdtp_subevent_streaming_connection_established_get_int_seid(packet); 242 acp_seid = avdtp_subevent_streaming_connection_established_get_acp_seid(packet); 243 244 if (status != 0){ 245 printf(" --- a2dp source --- AVDTP_SUBEVENT_STREAMING_CONNECTION could not be established, status %d ---\n", status); 246 break; 247 } 248 app_state = A2DP_STREAMING_OPENED; 249 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, avdtp_cid, int_seid, acp_seid, 0); 250 printf(" --- a2dp source --- AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED --- avdtp_cid 0x%02x, local seid %d, remote seid %d\n", avdtp_cid, int_seid, acp_seid); 251 break; 252 253 case AVDTP_SUBEVENT_SIGNALING_SEP_FOUND: 254 if (app_state != A2DP_W2_DISCOVER_SEPS) return; 255 sep.seid = avdtp_subevent_signaling_sep_found_get_seid(packet); 256 sep.in_use = avdtp_subevent_signaling_sep_found_get_in_use(packet); 257 sep.media_type = avdtp_subevent_signaling_sep_found_get_media_type(packet); 258 sep.type = avdtp_subevent_signaling_sep_found_get_sep_type(packet); 259 printf(" --- a2dp source --- Found sep: seid %u, in_use %d, media type %d, sep type %d (1-SNK)\n", sep.seid, sep.in_use, sep.media_type, sep.type); 260 break; 261 262 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CAPABILITY:{ 263 printf(" AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CAPABILITY 0\n"); 264 if (!sc.local_stream_endpoint) return; 265 printf(" AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CAPABILITY 1\n"); 266 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)); 267 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)); 268 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)); 269 uint8_t subbands = avdtp_choose_sbc_subbands(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_subbands_bitmap(packet)); 270 271 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)); 272 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)); 273 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)); 274 275 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[0] = (sampling_frequency << 4) | channel_mode; 276 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[1] = (block_length << 4) | (subbands << 2) | allocation_method; 277 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[2] = min_bitpool_value; 278 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[3] = max_bitpool_value; 279 280 sc.local_stream_endpoint->remote_configuration_bitmap = store_bit16(sc.local_stream_endpoint->remote_configuration_bitmap, AVDTP_MEDIA_CODEC, 1); 281 sc.local_stream_endpoint->remote_configuration.media_codec.media_type = AVDTP_AUDIO; 282 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_type = AVDTP_CODEC_SBC; 283 284 app_state = A2DP_W2_SET_CONFIGURATION; 285 break; 286 } 287 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CAPABILITY: 288 printf(" --- a2dp source --- received non SBC codec. not implemented\n"); 289 break; 290 291 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION:{ 292 sc.sampling_frequency = avdtp_subevent_signaling_media_codec_sbc_configuration_get_sampling_frequency(packet); 293 sc.block_length = avdtp_subevent_signaling_media_codec_sbc_configuration_get_block_length(packet); 294 sc.subbands = avdtp_subevent_signaling_media_codec_sbc_configuration_get_subbands(packet); 295 // switch (avdtp_subevent_signaling_media_codec_sbc_configuration_get_allocation_method(packet)){ 296 // case AVDTP_SBC_ALLOCATION_METHOD_LOUDNESS: 297 // sc.allocation_method = SBC_LOUDNESS; 298 // break; 299 // case AVDTP_SBC_ALLOCATION_METHOD_SNR: 300 // sc.allocation_method = SBC_SNR; 301 // break; 302 // } 303 sc.allocation_method = avdtp_subevent_signaling_media_codec_sbc_configuration_get_allocation_method(packet) - 1; 304 sc.max_bitpool_value = avdtp_subevent_signaling_media_codec_sbc_configuration_get_max_bitpool_value(packet); 305 // TODO: deal with reconfigure: avdtp_subevent_signaling_media_codec_sbc_configuration_get_reconfigure(packet); 306 break; 307 } 308 case AVDTP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW: 309 a2dp_streaming_emit_can_send_media_packet_now(a2dp_source_context.a2dp_callback, avdtp_cid, 0); 310 break; 311 312 case AVDTP_SUBEVENT_SIGNALING_ACCEPT: 313 signal_identifier = avdtp_subevent_signaling_accept_get_signal_identifier(packet); 314 status = avdtp_subevent_signaling_accept_get_status(packet); 315 printf(" --- a2dp source --- Accepted %d\n", signal_identifier); 316 317 switch (app_state){ 318 case A2DP_W2_DISCOVER_SEPS: 319 app_state = A2DP_W2_GET_ALL_CAPABILITIES; 320 sc.active_remote_sep = avdtp_source_remote_sep(avdtp_cid, next_remote_sep_index_to_query++); 321 printf(" --- a2dp source --- Query get caps for seid %d\n", sc.active_remote_sep->seid); 322 avdtp_source_get_capabilities(avdtp_cid, sc.active_remote_sep->seid); 323 break; 324 case A2DP_W2_GET_CAPABILITIES: 325 case A2DP_W2_GET_ALL_CAPABILITIES: 326 if (next_remote_sep_index_to_query < avdtp_source_remote_seps_num(avdtp_cid)){ 327 sc.active_remote_sep = avdtp_source_remote_sep(avdtp_cid, next_remote_sep_index_to_query++); 328 printf(" --- a2dp source --- Query get caps for seid %d\n", sc.active_remote_sep->seid); 329 avdtp_source_get_capabilities(avdtp_cid, sc.active_remote_sep->seid); 330 } else { 331 printf(" --- a2dp source --- No more remote seps found\n"); 332 app_state = A2DP_IDLE; 333 } 334 break; 335 case A2DP_W2_SET_CONFIGURATION:{ 336 if (!sc.local_stream_endpoint) return; 337 app_state = A2DP_W2_GET_CONFIGURATION; 338 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); 339 break; 340 } 341 case A2DP_W2_GET_CONFIGURATION: 342 app_state = A2DP_W2_OPEN_STREAM_WITH_SEID; 343 avdtp_source_get_configuration(avdtp_cid, sc.active_remote_sep->seid); 344 break; 345 case A2DP_W2_OPEN_STREAM_WITH_SEID:{ 346 app_state = A2DP_W4_OPEN_STREAM_WITH_SEID; 347 btstack_sbc_encoder_init(&sc.sbc_encoder_state, SBC_MODE_STANDARD, 348 sc.block_length, sc.subbands, 349 sc.allocation_method, sc.sampling_frequency, 350 sc.max_bitpool_value); 351 avdtp_source_open_stream(avdtp_cid, avdtp_stream_endpoint_seid(sc.local_stream_endpoint), sc.active_remote_sep->seid); 352 break; 353 } 354 case A2DP_STREAMING_OPENED: 355 if (!a2dp_source_context.a2dp_callback) return; 356 switch (signal_identifier){ 357 case AVDTP_SI_START:{ 358 uint8_t event[6]; 359 int pos = 0; 360 event[pos++] = HCI_EVENT_A2DP_META; 361 event[pos++] = sizeof(event) - 2; 362 event[pos++] = A2DP_SUBEVENT_STREAM_START_ACCEPTED; 363 little_endian_store_16(event, pos, avdtp_cid); 364 pos += 2; 365 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 366 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 367 break; 368 } 369 case AVDTP_SI_CLOSE:{ 370 uint8_t event[6]; 371 int pos = 0; 372 event[pos++] = HCI_EVENT_A2DP_META; 373 event[pos++] = sizeof(event) - 2; 374 event[pos++] = A2DP_SUBEVENT_STREAM_RELEASED; 375 little_endian_store_16(event, pos, avdtp_cid); 376 pos += 2; 377 printf("send A2DP_SUBEVENT_STREAM_RELEASED to app\n"); 378 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 379 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 380 break; 381 } 382 case AVDTP_SI_SUSPEND:{ 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_STREAM_SUSPENDED; 388 little_endian_store_16(event, pos, avdtp_cid); 389 pos += 2; 390 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 391 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 392 break; 393 } 394 default: 395 break; 396 } 397 break; 398 default: 399 app_state = A2DP_IDLE; 400 break; 401 } 402 403 break; 404 case AVDTP_SUBEVENT_SIGNALING_REJECT: 405 app_state = A2DP_IDLE; 406 signal_identifier = avdtp_subevent_signaling_reject_get_signal_identifier(packet); 407 printf(" --- a2dp source --- Rejected %d\n", signal_identifier); 408 break; 409 case AVDTP_SUBEVENT_SIGNALING_GENERAL_REJECT: 410 app_state = A2DP_IDLE; 411 signal_identifier = avdtp_subevent_signaling_general_reject_get_signal_identifier(packet); 412 printf(" --- a2dp source --- Rejected %d\n", signal_identifier); 413 break; 414 default: 415 app_state = A2DP_IDLE; 416 printf(" --- a2dp source --- not implemented\n"); 417 break; 418 } 419 break; 420 default: 421 break; 422 } 423 break; 424 default: 425 // other packet type 426 break; 427 } 428 } 429 void a2dp_source_register_packet_handler(btstack_packet_handler_t callback){ 430 if (callback == NULL){ 431 log_error("a2dp_source_register_packet_handler called with NULL callback"); 432 return; 433 } 434 avdtp_source_register_packet_handler(&packet_handler); 435 a2dp_source_context.a2dp_callback = callback; 436 } 437 438 void a2dp_source_init(void){ 439 avdtp_source_init(&a2dp_source_context); 440 l2cap_register_service(&packet_handler, BLUETOOTH_PROTOCOL_AVDTP, 0xffff, LEVEL_0); 441 } 442 443 uint8_t a2dp_source_create_stream_endpoint(avdtp_media_type_t media_type, avdtp_media_codec_type_t media_codec_type, 444 uint8_t * codec_capabilities, uint16_t codec_capabilities_len, 445 uint8_t * media_codec_info, uint16_t media_codec_info_len){ 446 avdtp_stream_endpoint_t * local_stream_endpoint = avdtp_source_create_stream_endpoint(AVDTP_SOURCE, media_type); 447 avdtp_source_register_media_transport_category(avdtp_stream_endpoint_seid(local_stream_endpoint)); 448 avdtp_source_register_media_codec_category(avdtp_stream_endpoint_seid(local_stream_endpoint), media_type, media_codec_type, 449 codec_capabilities, codec_capabilities_len); 450 local_stream_endpoint->remote_configuration.media_codec.media_codec_information = media_codec_info; 451 local_stream_endpoint->remote_configuration.media_codec.media_codec_information_len = media_codec_info_len; 452 453 return local_stream_endpoint->sep.seid; 454 } 455 456 void a2dp_source_establish_stream(bd_addr_t bd_addr, uint8_t local_seid){ 457 sc.local_stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 458 if (!sc.local_stream_endpoint){ 459 printf(" no local_stream_endpoint for seid %d\n", local_seid); 460 } 461 avdtp_source_connect(bd_addr); 462 463 } 464 465 void a2dp_source_disconnect(uint16_t con_handle){ 466 avdtp_disconnect(con_handle, &a2dp_source_context); 467 } 468 469 void a2dp_source_start_stream(uint8_t int_seid){ 470 avdtp_start_stream(int_seid, &a2dp_source_context); 471 } 472 473 void a2dp_source_release_stream(uint8_t int_seid){ 474 avdtp_stop_stream(int_seid, &a2dp_source_context); 475 } 476 477 void a2dp_source_pause_stream(uint8_t int_seid){ 478 avdtp_suspend_stream(int_seid, &a2dp_source_context); 479 } 480 481 uint8_t a2dp_source_stream_endpoint_ready(uint8_t local_seid){ 482 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 483 if (!stream_endpoint) { 484 printf("no stream_endpoint"); 485 return 0; 486 } 487 return (stream_endpoint->state == AVDTP_STREAM_ENDPOINT_STREAMING); 488 } 489 490 491 static void a2dp_source_setup_media_header(uint8_t * media_packet, int size, int *offset, uint8_t marker, uint16_t sequence_number){ 492 if (size < AVDTP_MEDIA_PAYLOAD_HEADER_SIZE){ 493 printf("small outgoing buffer\n"); 494 return; 495 } 496 497 uint8_t rtp_version = 2; 498 uint8_t padding = 0; 499 uint8_t extension = 0; 500 uint8_t csrc_count = 0; 501 uint8_t payload_type = 0x60; 502 // uint16_t sequence_number = stream_endpoint->sequence_number; 503 uint32_t timestamp = btstack_run_loop_get_time_ms(); 504 uint32_t ssrc = 0x11223344; 505 506 // rtp header (min size 12B) 507 int pos = 0; 508 // int mtu = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 509 510 media_packet[pos++] = (rtp_version << 6) | (padding << 5) | (extension << 4) | csrc_count; 511 media_packet[pos++] = (marker << 1) | payload_type; 512 big_endian_store_16(media_packet, pos, sequence_number); 513 pos += 2; 514 big_endian_store_32(media_packet, pos, timestamp); 515 pos += 4; 516 big_endian_store_32(media_packet, pos, ssrc); // only used for multicast 517 pos += 4; 518 *offset = pos; 519 } 520 521 void a2dp_source_stream_endpoint_request_can_send_now(uint8_t local_seid){ 522 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 523 if (!stream_endpoint) { 524 printf("no stream_endpoint"); 525 return; 526 } 527 stream_endpoint->send_stream = 1; 528 avdtp_request_can_send_now_initiator(stream_endpoint->connection, stream_endpoint->l2cap_media_cid); 529 } 530 531 int a2dp_max_media_payload_size(uint8_t int_seid){ 532 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(int_seid, &a2dp_source_context); 533 if (!stream_endpoint) { 534 printf("no stream_endpoint found for seid %d", int_seid); 535 return 0; 536 } 537 if (stream_endpoint->l2cap_media_cid == 0){ 538 printf("no media cid found for seid %d", int_seid); 539 return 0; 540 } 541 return l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid) - AVDTP_MEDIA_PAYLOAD_HEADER_SIZE; 542 } 543 544 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){ 545 if (size < num_bytes_to_copy + 1){ 546 printf("small outgoing buffer\n"); 547 return; 548 } 549 550 int pos = *offset; 551 media_packet[pos++] = num_frames; // (fragmentation << 7) | (starting_packet << 6) | (last_packet << 5) | num_frames; 552 memcpy(media_packet + pos, storage, num_bytes_to_copy); 553 pos += num_bytes_to_copy; 554 *offset = pos; 555 } 556 557 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){ 558 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(int_seid, &a2dp_source_context); 559 if (!stream_endpoint) { 560 printf("no stream_endpoint found for seid %d", int_seid); 561 return 0; 562 } 563 564 if (stream_endpoint->l2cap_media_cid == 0){ 565 printf("no media cid found for seid %d", int_seid); 566 return 0; 567 } 568 569 int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 570 int offset = 0; 571 572 l2cap_reserve_packet_buffer(); 573 uint8_t * media_packet = l2cap_get_outgoing_buffer(); 574 //int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 575 a2dp_source_setup_media_header(media_packet, size, &offset, marker, stream_endpoint->sequence_number); 576 a2dp_source_copy_media_payload(media_packet, size, &offset, storage, num_bytes_to_copy, num_frames); 577 stream_endpoint->sequence_number++; 578 l2cap_send_prepared(stream_endpoint->l2cap_media_cid, offset); 579 return size; 580 } 581