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 "classic/avdtp.h" 48 #include "classic/avdtp_util.h" 49 #include "classic/avdtp_source.h" 50 #include "classic/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 inline void a2dp_signaling_emit_media_codec_sbc(btstack_packet_handler_t callback, uint8_t * event, uint16_t event_size){ 158 if (!callback) return; 159 if (event_size < 18) return; 160 event[0] = HCI_EVENT_A2DP_META; 161 event[2] = A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION; 162 (*callback)(HCI_EVENT_PACKET, 0, event, event_size); 163 } 164 165 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 166 UNUSED(channel); 167 UNUSED(size); 168 169 uint8_t signal_identifier; 170 uint8_t status; 171 uint8_t local_seid; 172 uint8_t remote_seid; 173 uint16_t cid; 174 bd_addr_t address; 175 176 if (packet_type != HCI_EVENT_PACKET) return; 177 if (hci_event_packet_get_type(packet) != HCI_EVENT_AVDTP_META) return; 178 179 switch (packet[2]){ 180 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED:{ 181 avdtp_subevent_signaling_connection_established_get_bd_addr(packet, sc.remote_addr); 182 cid = avdtp_subevent_signaling_connection_established_get_avdtp_cid(packet); 183 status = avdtp_subevent_signaling_connection_established_get_status(packet); 184 185 if (status != 0){ 186 log_info("AVDTP_SUBEVENT_SIGNALING_CONNECTION failed status %d ---", status); 187 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, sc.remote_addr, 0, 0, status); 188 break; 189 } 190 191 sc.active_remote_sep = NULL; 192 next_remote_sep_index_to_query = 0; 193 uint8_t event[11]; 194 int pos = 0; 195 event[pos++] = HCI_EVENT_A2DP_META; 196 event[pos++] = sizeof(event) - 2; 197 event[pos++] = A2DP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED; 198 little_endian_store_16(event, pos, cid); 199 pos += 2; 200 reverse_bd_addr(event+pos, sc.remote_addr); 201 pos += 6; 202 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 203 204 log_info("A2DP_SUBEVENT_SIGNALING_CONNECTION established avdtp_cid 0x%02x ---", a2dp_source_context.avdtp_cid); 205 206 app_state = A2DP_W2_DISCOVER_SEPS; 207 avdtp_source_discover_stream_endpoints(cid); 208 break; 209 } 210 case AVDTP_SUBEVENT_SIGNALING_SEP_FOUND: 211 break; 212 213 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CAPABILITY:{ 214 log_info("A2DP received SBC capability."); 215 if (!sc.local_stream_endpoint) { 216 printf("local seid %d \n", avdtp_subevent_signaling_media_codec_sbc_capability_get_local_seid(packet)); 217 return; 218 } 219 log_info("A2DP received SBC capability."); 220 221 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)); 222 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)); 223 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)); 224 uint8_t subbands = avdtp_choose_sbc_subbands(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_subbands_bitmap(packet)); 225 226 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)); 227 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)); 228 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)); 229 230 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[0] = (sampling_frequency << 4) | channel_mode; 231 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[1] = (block_length << 4) | (subbands << 2) | allocation_method; 232 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[2] = min_bitpool_value; 233 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[3] = max_bitpool_value; 234 235 sc.local_stream_endpoint->remote_configuration_bitmap = store_bit16(sc.local_stream_endpoint->remote_configuration_bitmap, AVDTP_MEDIA_CODEC, 1); 236 sc.local_stream_endpoint->remote_configuration.media_codec.media_type = AVDTP_AUDIO; 237 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_type = AVDTP_CODEC_SBC; 238 239 app_state = A2DP_W2_SET_CONFIGURATION; 240 break; 241 } 242 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CAPABILITY: 243 log_info("received non SBC codec. not implemented"); 244 break; 245 246 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION:{ 247 // TODO check cid 248 sc.sampling_frequency = avdtp_subevent_signaling_media_codec_sbc_configuration_get_sampling_frequency(packet); 249 sc.block_length = avdtp_subevent_signaling_media_codec_sbc_configuration_get_block_length(packet); 250 sc.subbands = avdtp_subevent_signaling_media_codec_sbc_configuration_get_subbands(packet); 251 sc.allocation_method = avdtp_subevent_signaling_media_codec_sbc_configuration_get_allocation_method(packet) - 1; 252 sc.max_bitpool_value = avdtp_subevent_signaling_media_codec_sbc_configuration_get_max_bitpool_value(packet); 253 sc.channel_mode = avdtp_subevent_signaling_media_codec_sbc_configuration_get_channel_mode(packet); 254 // TODO: deal with reconfigure: avdtp_subevent_signaling_media_codec_sbc_configuration_get_reconfigure(packet); 255 log_info("A2DP received SBC Config: sample rate %u, max bitpool %u.", sc.sampling_frequency, sc.max_bitpool_value); 256 app_state = A2DP_W2_OPEN_STREAM_WITH_SEID; 257 a2dp_signaling_emit_media_codec_sbc(a2dp_source_context.a2dp_callback, packet, size); 258 break; 259 } 260 261 case AVDTP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW: 262 cid = avdtp_subevent_streaming_can_send_media_packet_now_get_avdtp_cid(packet); 263 a2dp_streaming_emit_can_send_media_packet_now(a2dp_source_context.a2dp_callback, cid, 0); 264 break; 265 266 case AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED: 267 avdtp_subevent_streaming_connection_established_get_bd_addr(packet, address); 268 status = avdtp_subevent_streaming_connection_established_get_status(packet); 269 cid = avdtp_subevent_streaming_connection_established_get_avdtp_cid(packet); 270 remote_seid = avdtp_subevent_streaming_connection_established_get_remote_seid(packet); 271 local_seid = avdtp_subevent_streaming_connection_established_get_local_seid(packet); 272 if (status != 0){ 273 log_info("AVDTP_SUBEVENT_STREAMING_CONNECTION could not be established, status %d ---", status); 274 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, address, local_seid, remote_seid, status); 275 break; 276 } 277 278 app_state = A2DP_STREAMING_OPENED; 279 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, address, local_seid, remote_seid, 0); 280 log_info("AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED --- avdtp_cid 0x%02x, local seid %d, remote seid %d", cid, local_seid, remote_seid); 281 break; 282 283 case AVDTP_SUBEVENT_SIGNALING_ACCEPT: 284 // TODO check cid 285 signal_identifier = avdtp_subevent_signaling_accept_get_signal_identifier(packet); 286 cid = avdtp_subevent_signaling_accept_get_avdtp_cid(packet); 287 log_info("A2DP Accepted %d, state %d", signal_identifier, app_state); 288 289 switch (app_state){ 290 case A2DP_W2_DISCOVER_SEPS: 291 app_state = A2DP_W2_GET_ALL_CAPABILITIES; 292 sc.active_remote_sep = avdtp_source_remote_sep(cid, next_remote_sep_index_to_query++); 293 if (!sc.active_remote_sep) { 294 app_state = A2DP_IDLE; 295 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, sc.remote_addr, 0, 0, AVDTP_SEID_DOES_NOT_EXIST); 296 break; 297 } 298 avdtp_source_get_capabilities(cid, sc.active_remote_sep->seid); 299 break; 300 case A2DP_W2_GET_CAPABILITIES: 301 case A2DP_W2_GET_ALL_CAPABILITIES: 302 if (next_remote_sep_index_to_query < avdtp_source_remote_seps_num(cid)){ 303 sc.active_remote_sep = avdtp_source_remote_sep(cid, next_remote_sep_index_to_query++); 304 // printf("Query get caps for seid %d\n", sc.active_remote_sep->seid); 305 avdtp_source_get_capabilities(cid, sc.active_remote_sep->seid); 306 } else { 307 // printf("No more remote seps found\n"); 308 app_state = A2DP_IDLE; 309 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, sc.remote_addr, 0, 0, AVDTP_SEID_DOES_NOT_EXIST); 310 } 311 break; 312 case A2DP_W2_SET_CONFIGURATION:{ 313 if (!sc.local_stream_endpoint) return; 314 app_state = A2DP_IDLE; 315 log_info("A2DP initiate set configuration locally and wait for response ... "); 316 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); 317 break; 318 } 319 case A2DP_W2_OPEN_STREAM_WITH_SEID:{ 320 log_info("A2DP open stream "); 321 app_state = A2DP_W4_OPEN_STREAM_WITH_SEID; 322 avdtp_source_open_stream(cid, avdtp_stream_endpoint_seid(sc.local_stream_endpoint), sc.active_remote_sep->seid); 323 break; 324 } 325 case A2DP_STREAMING_OPENED: 326 if (!a2dp_source_context.a2dp_callback) return; 327 switch (signal_identifier){ 328 case AVDTP_SI_START:{ 329 uint8_t event[6]; 330 int pos = 0; 331 event[pos++] = HCI_EVENT_A2DP_META; 332 event[pos++] = sizeof(event) - 2; 333 event[pos++] = A2DP_SUBEVENT_STREAM_STARTED; 334 little_endian_store_16(event, pos, cid); 335 pos += 2; 336 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 337 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 338 break; 339 } 340 case AVDTP_SI_SUSPEND:{ 341 uint8_t event[6]; 342 int pos = 0; 343 event[pos++] = HCI_EVENT_A2DP_META; 344 event[pos++] = sizeof(event) - 2; 345 event[pos++] = A2DP_SUBEVENT_STREAM_SUSPENDED; 346 little_endian_store_16(event, pos, cid); 347 pos += 2; 348 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 349 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 350 break; 351 } 352 case AVDTP_SI_ABORT: 353 case AVDTP_SI_CLOSE:{ 354 uint8_t event[6]; 355 int pos = 0; 356 event[pos++] = HCI_EVENT_A2DP_META; 357 event[pos++] = sizeof(event) - 2; 358 event[pos++] = A2DP_SUBEVENT_STREAM_STOPPED; 359 little_endian_store_16(event, pos, cid); 360 pos += 2; 361 log_info("send A2DP_SUBEVENT_STREAM_RELEASED to app"); 362 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 363 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 364 break; 365 } 366 default: 367 break; 368 } 369 break; 370 default: 371 app_state = A2DP_IDLE; 372 break; 373 } 374 375 break; 376 case AVDTP_SUBEVENT_SIGNALING_REJECT: 377 app_state = A2DP_IDLE; 378 signal_identifier = avdtp_subevent_signaling_reject_get_signal_identifier(packet); 379 log_info("A2DP Rejected %d", signal_identifier); 380 break; 381 case AVDTP_SUBEVENT_SIGNALING_GENERAL_REJECT: 382 app_state = A2DP_IDLE; 383 signal_identifier = avdtp_subevent_signaling_general_reject_get_signal_identifier(packet); 384 log_info("A2DP Rejected %d", signal_identifier); 385 break; 386 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_RELEASED:{ 387 app_state = A2DP_IDLE; 388 uint8_t event[6]; 389 int pos = 0; 390 event[pos++] = HCI_EVENT_A2DP_META; 391 event[pos++] = sizeof(event) - 2; 392 event[pos++] = A2DP_SUBEVENT_SIGNALING_CONNECTION_RELEASED; 393 little_endian_store_16(event, pos, avdtp_subevent_streaming_connection_released_get_avdtp_cid(packet)); 394 pos += 2; 395 event[pos++] = avdtp_subevent_streaming_connection_released_get_local_seid(packet); 396 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 397 break; 398 } 399 case AVDTP_SUBEVENT_STREAMING_CONNECTION_RELEASED:{ 400 app_state = A2DP_IDLE; 401 uint8_t event[6]; 402 int pos = 0; 403 event[pos++] = HCI_EVENT_A2DP_META; 404 event[pos++] = sizeof(event) - 2; 405 event[pos++] = A2DP_SUBEVENT_STREAM_RELEASED; 406 little_endian_store_16(event, pos, avdtp_subevent_streaming_connection_released_get_avdtp_cid(packet)); 407 pos += 2; 408 event[pos++] = avdtp_subevent_streaming_connection_released_get_local_seid(packet); 409 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 410 break; 411 } 412 default: 413 app_state = A2DP_IDLE; 414 log_info("not implemented"); 415 break; 416 } 417 } 418 void a2dp_source_register_packet_handler(btstack_packet_handler_t callback){ 419 if (callback == NULL){ 420 log_error("a2dp_source_register_packet_handler called with NULL callback"); 421 return; 422 } 423 avdtp_source_register_packet_handler(&packet_handler); 424 a2dp_source_context.a2dp_callback = callback; 425 } 426 427 void a2dp_source_init(void){ 428 avdtp_source_init(&a2dp_source_context); 429 l2cap_register_service(&packet_handler, BLUETOOTH_PROTOCOL_AVDTP, 0xffff, LEVEL_0); 430 } 431 432 avdtp_stream_endpoint_t * a2dp_source_create_stream_endpoint(avdtp_media_type_t media_type, avdtp_media_codec_type_t media_codec_type, 433 uint8_t * codec_capabilities, uint16_t codec_capabilities_len, 434 uint8_t * media_codec_info, uint16_t media_codec_info_len){ 435 avdtp_stream_endpoint_t * local_stream_endpoint = avdtp_source_create_stream_endpoint(AVDTP_SOURCE, media_type); 436 if (!local_stream_endpoint){ 437 return NULL; 438 } 439 avdtp_source_register_media_transport_category(avdtp_stream_endpoint_seid(local_stream_endpoint)); 440 avdtp_source_register_media_codec_category(avdtp_stream_endpoint_seid(local_stream_endpoint), media_type, media_codec_type, 441 codec_capabilities, codec_capabilities_len); 442 local_stream_endpoint->remote_configuration.media_codec.media_codec_information = media_codec_info; 443 local_stream_endpoint->remote_configuration.media_codec.media_codec_information_len = media_codec_info_len; 444 sc.local_stream_endpoint = local_stream_endpoint; 445 return local_stream_endpoint; 446 } 447 448 uint8_t a2dp_source_establish_stream(bd_addr_t remote_addr, uint8_t loc_seid, uint16_t * a2dp_cid){ 449 sc.local_stream_endpoint = avdtp_stream_endpoint_for_seid(loc_seid, &a2dp_source_context); 450 if (!sc.local_stream_endpoint){ 451 log_error(" no local_stream_endpoint for seid %d", loc_seid); 452 return AVDTP_SEID_DOES_NOT_EXIST; 453 } 454 memcpy(sc.remote_addr, remote_addr, 6); 455 return avdtp_source_connect(remote_addr, a2dp_cid); 456 } 457 458 uint8_t a2dp_source_disconnect(uint16_t a2dp_cid){ 459 return avdtp_disconnect(a2dp_cid, &a2dp_source_context); 460 } 461 462 uint8_t a2dp_source_start_stream(uint16_t a2dp_cid, uint8_t local_seid){ 463 return avdtp_start_stream(a2dp_cid, local_seid, &a2dp_source_context); 464 } 465 466 uint8_t a2dp_source_pause_stream(uint16_t a2dp_cid, uint8_t local_seid){ 467 return avdtp_suspend_stream(a2dp_cid, local_seid, &a2dp_source_context); 468 } 469 470 static void a2dp_source_setup_media_header(uint8_t * media_packet, int size, int *offset, uint8_t marker, uint16_t sequence_number){ 471 if (size < AVDTP_MEDIA_PAYLOAD_HEADER_SIZE){ 472 log_error("small outgoing buffer"); 473 return; 474 } 475 476 uint8_t rtp_version = 2; 477 uint8_t padding = 0; 478 uint8_t extension = 0; 479 uint8_t csrc_count = 0; 480 uint8_t payload_type = 0x60; 481 // uint16_t sequence_number = stream_endpoint->sequence_number; 482 uint32_t timestamp = btstack_run_loop_get_time_ms(); 483 uint32_t ssrc = 0x11223344; 484 485 // rtp header (min size 12B) 486 int pos = 0; 487 // int mtu = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 488 489 media_packet[pos++] = (rtp_version << 6) | (padding << 5) | (extension << 4) | csrc_count; 490 media_packet[pos++] = (marker << 1) | payload_type; 491 big_endian_store_16(media_packet, pos, sequence_number); 492 pos += 2; 493 big_endian_store_32(media_packet, pos, timestamp); 494 pos += 4; 495 big_endian_store_32(media_packet, pos, ssrc); // only used for multicast 496 pos += 4; 497 *offset = pos; 498 } 499 500 void a2dp_source_stream_endpoint_request_can_send_now(uint16_t a2dp_cid, uint8_t local_seid){ 501 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 502 if (!stream_endpoint) { 503 log_error("A2DP source: no stream_endpoint with seid %d", local_seid); 504 return; 505 } 506 if (a2dp_source_context.avdtp_cid != a2dp_cid){ 507 log_error("A2DP source: a2dp cid 0x%02x not known, expected 0x%02x", a2dp_cid, a2dp_source_context.avdtp_cid); 508 return; 509 } 510 stream_endpoint->send_stream = 1; 511 avdtp_request_can_send_now_initiator(stream_endpoint->connection, stream_endpoint->l2cap_media_cid); 512 } 513 514 int a2dp_max_media_payload_size(uint16_t a2dp_cid, uint8_t local_seid){ 515 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 516 if (!stream_endpoint) { 517 log_error("A2DP source: no stream_endpoint with seid %d", local_seid); 518 return 0; 519 } 520 if (a2dp_source_context.avdtp_cid != a2dp_cid){ 521 log_error("A2DP source: a2dp cid 0x%02x not known, expected 0x%02x", a2dp_cid, a2dp_source_context.avdtp_cid); 522 return 0; 523 } 524 525 if (stream_endpoint->l2cap_media_cid == 0){ 526 log_error("A2DP source: no media connection for seid %d", local_seid); 527 return 0; 528 } 529 return l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid) - AVDTP_MEDIA_PAYLOAD_HEADER_SIZE; 530 } 531 532 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){ 533 if (size < num_bytes_to_copy + 1){ 534 log_error("small outgoing buffer: buffer size %u, but need %u", size, num_bytes_to_copy + 1); 535 return; 536 } 537 538 int pos = *offset; 539 media_packet[pos++] = num_frames; // (fragmentation << 7) | (starting_packet << 6) | (last_packet << 5) | num_frames; 540 memcpy(media_packet + pos, storage, num_bytes_to_copy); 541 pos += num_bytes_to_copy; 542 *offset = pos; 543 } 544 545 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){ 546 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 547 if (!stream_endpoint) { 548 log_error("A2DP source: no stream_endpoint with seid %d", local_seid); 549 return 0; 550 } 551 if (a2dp_source_context.avdtp_cid != a2dp_cid){ 552 log_error("A2DP source: a2dp cid 0x%02x not known, expected 0x%02x", a2dp_cid, a2dp_source_context.avdtp_cid); 553 return 0; 554 } 555 556 if (stream_endpoint->l2cap_media_cid == 0){ 557 log_error("A2DP source: no media connection for seid %d", local_seid); 558 return 0; 559 } 560 561 int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 562 int offset = 0; 563 564 l2cap_reserve_packet_buffer(); 565 uint8_t * media_packet = l2cap_get_outgoing_buffer(); 566 //int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 567 a2dp_source_setup_media_header(media_packet, size, &offset, marker, stream_endpoint->sequence_number); 568 a2dp_source_copy_media_payload(media_packet, size, &offset, storage, num_bytes_to_copy, num_frames); 569 stream_endpoint->sequence_number++; 570 l2cap_send_prepared(stream_endpoint->l2cap_media_cid, offset); 571 return size; 572 } 573