1 2 /* 3 * Copyright (C) 2016 BlueKitchen GmbH 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the copyright holders nor the names of 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 4. Any redistribution, use, or modification is done solely for 18 * personal benefit and not for any commercial purpose or for 19 * monetary gain. 20 * 21 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 25 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 28 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 31 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * Please inquire about commercial licensing options at 35 * [email protected] 36 * 37 */ 38 39 #define __BTSTACK_FILE__ "a2dp_source.c" 40 41 #include <stdint.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 46 #include "btstack.h" 47 #include "avdtp.h" 48 #include "avdtp_util.h" 49 #include "avdtp_source.h" 50 #include "a2dp_source.h" 51 52 #define AVDTP_MEDIA_PAYLOAD_HEADER_SIZE 12 53 54 static const char * default_a2dp_source_service_name = "BTstack A2DP Source Service"; 55 static const char * default_a2dp_source_service_provider_name = "BTstack A2DP Source Service Provider"; 56 static avdtp_context_t a2dp_source_context; 57 58 static a2dp_state_t app_state = A2DP_IDLE; 59 static avdtp_stream_endpoint_context_t sc; 60 static int next_remote_sep_index_to_query = 0; 61 62 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 63 64 void a2dp_source_create_sdp_record(uint8_t * service, uint32_t service_record_handle, uint16_t supported_features, const char * service_name, const char * service_provider_name){ 65 uint8_t* attribute; 66 de_create_sequence(service); 67 68 // 0x0000 "Service Record Handle" 69 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_SERVICE_RECORD_HANDLE); 70 de_add_number(service, DE_UINT, DE_SIZE_32, service_record_handle); 71 72 // 0x0001 "Service Class ID List" 73 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_SERVICE_CLASS_ID_LIST); 74 attribute = de_push_sequence(service); 75 { 76 de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_AUDIO_SOURCE); 77 } 78 de_pop_sequence(service, attribute); 79 80 // 0x0004 "Protocol Descriptor List" 81 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST); 82 attribute = de_push_sequence(service); 83 { 84 uint8_t* l2cpProtocol = de_push_sequence(attribute); 85 { 86 de_add_number(l2cpProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_L2CAP); 87 de_add_number(l2cpProtocol, DE_UINT, DE_SIZE_16, BLUETOOTH_PROTOCOL_AVDTP); 88 } 89 de_pop_sequence(attribute, l2cpProtocol); 90 91 uint8_t* avProtocol = de_push_sequence(attribute); 92 { 93 de_add_number(avProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_AVDTP); // avProtocol_service 94 de_add_number(avProtocol, DE_UINT, DE_SIZE_16, 0x0103); // version 95 } 96 de_pop_sequence(attribute, avProtocol); 97 } 98 de_pop_sequence(service, attribute); 99 100 // 0x0005 "Public Browse Group" 101 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_BROWSE_GROUP_LIST); // public browse group 102 attribute = de_push_sequence(service); 103 { 104 de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_PUBLIC_BROWSE_ROOT); 105 } 106 de_pop_sequence(service, attribute); 107 108 // 0x0009 "Bluetooth Profile Descriptor List" 109 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_BLUETOOTH_PROFILE_DESCRIPTOR_LIST); 110 attribute = de_push_sequence(service); 111 { 112 uint8_t *a2dProfile = de_push_sequence(attribute); 113 { 114 de_add_number(a2dProfile, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_ADVANCED_AUDIO_DISTRIBUTION); 115 de_add_number(a2dProfile, DE_UINT, DE_SIZE_16, 0x0103); 116 } 117 de_pop_sequence(attribute, a2dProfile); 118 } 119 de_pop_sequence(service, attribute); 120 121 122 // 0x0100 "Service Name" 123 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0100); 124 if (service_name){ 125 de_add_data(service, DE_STRING, strlen(service_name), (uint8_t *) service_name); 126 } else { 127 de_add_data(service, DE_STRING, strlen(default_a2dp_source_service_name), (uint8_t *) default_a2dp_source_service_name); 128 } 129 130 // 0x0100 "Provider Name" 131 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0102); 132 if (service_provider_name){ 133 de_add_data(service, DE_STRING, strlen(service_provider_name), (uint8_t *) service_provider_name); 134 } else { 135 de_add_data(service, DE_STRING, strlen(default_a2dp_source_service_provider_name), (uint8_t *) default_a2dp_source_service_provider_name); 136 } 137 138 // 0x0311 "Supported Features" 139 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0311); 140 de_add_number(service, DE_UINT, DE_SIZE_16, supported_features); 141 } 142 143 144 static void a2dp_streaming_emit_can_send_media_packet_now(btstack_packet_handler_t callback, uint16_t cid, uint8_t seid){ 145 if (!callback) return; 146 uint8_t event[8]; 147 int pos = 0; 148 event[pos++] = HCI_EVENT_A2DP_META; 149 event[pos++] = sizeof(event) - 2; 150 event[pos++] = A2DP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW; 151 little_endian_store_16(event, pos, cid); 152 pos += 2; 153 event[pos++] = seid; 154 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 155 } 156 157 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 158 UNUSED(channel); 159 UNUSED(size); 160 161 uint8_t signal_identifier; 162 uint8_t status; 163 avdtp_sep_t sep; 164 uint8_t local_seid; 165 uint8_t remote_seid; 166 uint16_t cid; 167 bd_addr_t address; 168 uint8_t sep_media_type; 169 uint8_t sep_type; 170 171 if (packet_type != HCI_EVENT_PACKET) return; 172 if (hci_event_packet_get_type(packet) != HCI_EVENT_AVDTP_META) return; 173 174 switch (packet[2]){ 175 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED: 176 avdtp_subevent_signaling_connection_established_get_bd_addr(packet, sc.remote_addr); 177 cid = avdtp_subevent_signaling_connection_established_get_avdtp_cid(packet); 178 status = avdtp_subevent_signaling_connection_established_get_status(packet); 179 if (status != 0){ 180 log_info("AVDTP_SUBEVENT_SIGNALING_CONNECTION failed status %d ---", status); 181 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, sc.remote_addr, 0, 0, status); 182 break; 183 } 184 185 sc.active_remote_sep = NULL; 186 next_remote_sep_index_to_query = 0; 187 app_state = A2DP_W2_DISCOVER_SEPS; 188 log_info("AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED, avdtp cid 0x%02x ---", cid); 189 avdtp_source_discover_stream_endpoints(cid); 190 break; 191 192 case AVDTP_SUBEVENT_SIGNALING_SEP_FOUND: 193 if (app_state != A2DP_W2_DISCOVER_SEPS) return; 194 sep.seid = avdtp_subevent_signaling_sep_found_get_remote_seid(packet); 195 sep.in_use = avdtp_subevent_signaling_sep_found_get_in_use(packet); 196 // use local variables to avoid compiler warning 197 sep_media_type = avdtp_subevent_signaling_sep_found_get_media_type(packet); 198 sep.media_type = (avdtp_media_type_t) sep_media_type; 199 sep_type = avdtp_subevent_signaling_sep_found_get_sep_type(packet); 200 sep.type = (avdtp_sep_type_t) sep_type; 201 log_info("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); 202 break; 203 204 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CAPABILITY:{ 205 if (!sc.local_stream_endpoint) return; 206 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)); 207 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)); 208 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)); 209 uint8_t subbands = avdtp_choose_sbc_subbands(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_subbands_bitmap(packet)); 210 211 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)); 212 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)); 213 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)); 214 215 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[0] = (sampling_frequency << 4) | channel_mode; 216 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[1] = (block_length << 4) | (subbands << 2) | allocation_method; 217 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[2] = min_bitpool_value; 218 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[3] = max_bitpool_value; 219 220 sc.local_stream_endpoint->remote_configuration_bitmap = store_bit16(sc.local_stream_endpoint->remote_configuration_bitmap, AVDTP_MEDIA_CODEC, 1); 221 sc.local_stream_endpoint->remote_configuration.media_codec.media_type = AVDTP_AUDIO; 222 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_type = AVDTP_CODEC_SBC; 223 224 app_state = A2DP_W2_SET_CONFIGURATION; 225 break; 226 } 227 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CAPABILITY: 228 log_info("received non SBC codec. not implemented"); 229 break; 230 231 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION:{ 232 // TODO check cid 233 sc.sampling_frequency = avdtp_subevent_signaling_media_codec_sbc_configuration_get_sampling_frequency(packet); 234 sc.block_length = avdtp_subevent_signaling_media_codec_sbc_configuration_get_block_length(packet); 235 sc.subbands = avdtp_subevent_signaling_media_codec_sbc_configuration_get_subbands(packet); 236 sc.allocation_method = avdtp_subevent_signaling_media_codec_sbc_configuration_get_allocation_method(packet) - 1; 237 sc.max_bitpool_value = avdtp_subevent_signaling_media_codec_sbc_configuration_get_max_bitpool_value(packet); 238 sc.channel_mode = avdtp_subevent_signaling_media_codec_sbc_configuration_get_channel_mode(packet); 239 // TODO: deal with reconfigure: avdtp_subevent_signaling_media_codec_sbc_configuration_get_reconfigure(packet); 240 break; 241 } 242 case AVDTP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW: 243 cid = avdtp_subevent_streaming_can_send_media_packet_now_get_avdtp_cid(packet); 244 a2dp_streaming_emit_can_send_media_packet_now(a2dp_source_context.a2dp_callback, cid, 0); 245 break; 246 247 case AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED: 248 avdtp_subevent_streaming_connection_established_get_bd_addr(packet, address); 249 status = avdtp_subevent_streaming_connection_established_get_status(packet); 250 cid = avdtp_subevent_streaming_connection_established_get_avdtp_cid(packet); 251 remote_seid = avdtp_subevent_streaming_connection_established_get_remote_seid(packet); 252 local_seid = avdtp_subevent_streaming_connection_established_get_local_seid(packet); 253 if (status != 0){ 254 log_info("AVDTP_SUBEVENT_STREAMING_CONNECTION could not be established, status %d ---", status); 255 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, address, local_seid, remote_seid, status); 256 break; 257 } 258 259 app_state = A2DP_STREAMING_OPENED; 260 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, address, local_seid, remote_seid, 0); 261 log_info("AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED --- avdtp_cid 0x%02x, local seid %d, remote seid %d", cid, local_seid, remote_seid); 262 break; 263 264 case AVDTP_SUBEVENT_SIGNALING_ACCEPT: 265 // TODO check cid 266 signal_identifier = avdtp_subevent_signaling_accept_get_signal_identifier(packet); 267 cid = avdtp_subevent_signaling_accept_get_avdtp_cid(packet); 268 log_info("Accepted %d", signal_identifier); 269 270 switch (app_state){ 271 case A2DP_W2_DISCOVER_SEPS: 272 app_state = A2DP_W2_GET_ALL_CAPABILITIES; 273 274 sc.active_remote_sep = avdtp_source_remote_sep(cid, next_remote_sep_index_to_query++); 275 if (!sc.active_remote_sep) { 276 app_state = A2DP_IDLE; 277 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, sc.remote_addr, 0, 0, AVDTP_SEID_DOES_NOT_EXIST); 278 break; 279 } 280 log_info("Query get caps for seid %d", sc.active_remote_sep->seid); 281 avdtp_source_get_capabilities(cid, sc.active_remote_sep->seid); 282 break; 283 case A2DP_W2_GET_CAPABILITIES: 284 case A2DP_W2_GET_ALL_CAPABILITIES: 285 if (next_remote_sep_index_to_query < avdtp_source_remote_seps_num(cid)){ 286 sc.active_remote_sep = avdtp_source_remote_sep(cid, next_remote_sep_index_to_query++); 287 log_info("Query get caps for seid %d", sc.active_remote_sep->seid); 288 avdtp_source_get_capabilities(cid, sc.active_remote_sep->seid); 289 } else { 290 log_info("No more remote seps found"); 291 app_state = A2DP_IDLE; 292 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, sc.remote_addr, 0, 0, AVDTP_SEID_DOES_NOT_EXIST); 293 } 294 break; 295 case A2DP_W2_SET_CONFIGURATION:{ 296 if (!sc.local_stream_endpoint) return; 297 app_state = A2DP_W2_GET_CONFIGURATION; 298 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); 299 break; 300 } 301 case A2DP_W2_GET_CONFIGURATION: 302 app_state = A2DP_W2_OPEN_STREAM_WITH_SEID; 303 avdtp_source_get_configuration(cid, sc.active_remote_sep->seid); 304 break; 305 case A2DP_W2_OPEN_STREAM_WITH_SEID:{ 306 app_state = A2DP_W4_OPEN_STREAM_WITH_SEID; 307 btstack_sbc_encoder_init(&sc.sbc_encoder_state, SBC_MODE_STANDARD, 308 sc.block_length, sc.subbands, 309 sc.allocation_method, sc.sampling_frequency, 310 sc.max_bitpool_value, 311 sc.channel_mode); 312 avdtp_source_open_stream(cid, avdtp_stream_endpoint_seid(sc.local_stream_endpoint), sc.active_remote_sep->seid); 313 break; 314 } 315 case A2DP_STREAMING_OPENED: 316 if (!a2dp_source_context.a2dp_callback) return; 317 switch (signal_identifier){ 318 case AVDTP_SI_START:{ 319 uint8_t event[6]; 320 int pos = 0; 321 event[pos++] = HCI_EVENT_A2DP_META; 322 event[pos++] = sizeof(event) - 2; 323 event[pos++] = A2DP_SUBEVENT_STREAM_STARTED; 324 little_endian_store_16(event, pos, cid); 325 pos += 2; 326 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 327 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 328 break; 329 } 330 case AVDTP_SI_SUSPEND:{ 331 uint8_t event[6]; 332 int pos = 0; 333 event[pos++] = HCI_EVENT_A2DP_META; 334 event[pos++] = sizeof(event) - 2; 335 event[pos++] = A2DP_SUBEVENT_STREAM_SUSPENDED; 336 little_endian_store_16(event, pos, cid); 337 pos += 2; 338 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 339 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 340 break; 341 } 342 case AVDTP_SI_ABORT: 343 case AVDTP_SI_CLOSE:{ 344 uint8_t event[6]; 345 int pos = 0; 346 event[pos++] = HCI_EVENT_A2DP_META; 347 event[pos++] = sizeof(event) - 2; 348 event[pos++] = A2DP_SUBEVENT_STREAM_RELEASED; 349 little_endian_store_16(event, pos, cid); 350 pos += 2; 351 log_info("send A2DP_SUBEVENT_STREAM_RELEASED to app"); 352 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 353 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 354 break; 355 } 356 default: 357 break; 358 } 359 break; 360 default: 361 app_state = A2DP_IDLE; 362 break; 363 } 364 365 break; 366 case AVDTP_SUBEVENT_SIGNALING_REJECT: 367 app_state = A2DP_IDLE; 368 signal_identifier = avdtp_subevent_signaling_reject_get_signal_identifier(packet); 369 log_info("Rejected %d", signal_identifier); 370 break; 371 case AVDTP_SUBEVENT_SIGNALING_GENERAL_REJECT: 372 app_state = A2DP_IDLE; 373 signal_identifier = avdtp_subevent_signaling_general_reject_get_signal_identifier(packet); 374 log_info("Rejected %d", signal_identifier); 375 break; 376 case AVDTP_SUBEVENT_STREAMING_CONNECTION_RELEASED:{ 377 uint8_t event[6]; 378 int pos = 0; 379 event[pos++] = HCI_EVENT_AVDTP_META; 380 event[pos++] = sizeof(event) - 2; 381 event[pos++] = A2DP_SUBEVENT_STREAM_RELEASED; 382 little_endian_store_16(event, pos, avdtp_subevent_streaming_connection_released_get_avdtp_cid(packet)); 383 pos += 2; 384 event[pos++] = avdtp_subevent_streaming_connection_released_get_local_seid(packet); 385 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 386 break; 387 } 388 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_RELEASED: 389 break; 390 default: 391 app_state = A2DP_IDLE; 392 log_info("not implemented"); 393 break; 394 } 395 } 396 void a2dp_source_register_packet_handler(btstack_packet_handler_t callback){ 397 if (callback == NULL){ 398 log_error("a2dp_source_register_packet_handler called with NULL callback"); 399 return; 400 } 401 avdtp_source_register_packet_handler(&packet_handler); 402 a2dp_source_context.a2dp_callback = callback; 403 } 404 405 void a2dp_source_init(void){ 406 avdtp_source_init(&a2dp_source_context); 407 l2cap_register_service(&packet_handler, BLUETOOTH_PROTOCOL_AVDTP, 0xffff, LEVEL_0); 408 } 409 410 avdtp_stream_endpoint_t * a2dp_source_create_stream_endpoint(avdtp_media_type_t media_type, avdtp_media_codec_type_t media_codec_type, 411 uint8_t * codec_capabilities, uint16_t codec_capabilities_len, 412 uint8_t * media_codec_info, uint16_t media_codec_info_len){ 413 avdtp_stream_endpoint_t * local_stream_endpoint = avdtp_source_create_stream_endpoint(AVDTP_SOURCE, media_type); 414 if (!local_stream_endpoint){ 415 return NULL; 416 } 417 avdtp_source_register_media_transport_category(avdtp_stream_endpoint_seid(local_stream_endpoint)); 418 avdtp_source_register_media_codec_category(avdtp_stream_endpoint_seid(local_stream_endpoint), media_type, media_codec_type, 419 codec_capabilities, codec_capabilities_len); 420 local_stream_endpoint->remote_configuration.media_codec.media_codec_information = media_codec_info; 421 local_stream_endpoint->remote_configuration.media_codec.media_codec_information_len = media_codec_info_len; 422 423 return local_stream_endpoint; 424 } 425 426 uint8_t a2dp_source_establish_stream(bd_addr_t remote_addr, uint8_t loc_seid, uint16_t * avdtp_cid){ 427 sc.local_stream_endpoint = avdtp_stream_endpoint_for_seid(loc_seid, &a2dp_source_context); 428 if (!sc.local_stream_endpoint){ 429 log_error(" no local_stream_endpoint for seid %d", loc_seid); 430 return AVDTP_SEID_DOES_NOT_EXIST; 431 } 432 memcpy(sc.remote_addr, remote_addr, 6); 433 return avdtp_source_connect(remote_addr, avdtp_cid); 434 } 435 436 uint8_t a2dp_source_disconnect(uint16_t avdtp_cid){ 437 return avdtp_disconnect(avdtp_cid, &a2dp_source_context); 438 } 439 440 uint8_t a2dp_source_start_stream(uint16_t avdtp_cid, uint8_t local_seid){ 441 return avdtp_start_stream(avdtp_cid, local_seid, &a2dp_source_context); 442 } 443 444 uint8_t a2dp_source_pause_stream(uint16_t avdtp_cid, uint8_t local_seid){ 445 return avdtp_suspend_stream(avdtp_cid, local_seid, &a2dp_source_context); 446 } 447 448 uint8_t a2dp_source_stream_endpoint_ready(uint16_t avdtp_cid, uint8_t local_seid){ 449 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 450 if (!stream_endpoint) { 451 log_error("No stream_endpoint with seid %d", local_seid); 452 return 0; 453 } 454 if (!stream_endpoint->connection || stream_endpoint->connection->avdtp_cid != avdtp_cid) return 0; 455 return (stream_endpoint->state == AVDTP_STREAM_ENDPOINT_STREAMING); 456 } 457 458 static void a2dp_source_setup_media_header(uint8_t * media_packet, int size, int *offset, uint8_t marker, uint16_t sequence_number){ 459 if (size < AVDTP_MEDIA_PAYLOAD_HEADER_SIZE){ 460 log_error("small outgoing buffer"); 461 return; 462 } 463 464 uint8_t rtp_version = 2; 465 uint8_t padding = 0; 466 uint8_t extension = 0; 467 uint8_t csrc_count = 0; 468 uint8_t payload_type = 0x60; 469 // uint16_t sequence_number = stream_endpoint->sequence_number; 470 uint32_t timestamp = btstack_run_loop_get_time_ms(); 471 uint32_t ssrc = 0x11223344; 472 473 // rtp header (min size 12B) 474 int pos = 0; 475 // int mtu = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 476 477 media_packet[pos++] = (rtp_version << 6) | (padding << 5) | (extension << 4) | csrc_count; 478 media_packet[pos++] = (marker << 1) | payload_type; 479 big_endian_store_16(media_packet, pos, sequence_number); 480 pos += 2; 481 big_endian_store_32(media_packet, pos, timestamp); 482 pos += 4; 483 big_endian_store_32(media_packet, pos, ssrc); // only used for multicast 484 pos += 4; 485 *offset = pos; 486 } 487 488 void a2dp_source_stream_endpoint_request_can_send_now(uint8_t local_seid){ 489 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 490 if (!stream_endpoint) { 491 log_error("no stream_endpoint for seid %d", local_seid); 492 return; 493 } 494 stream_endpoint->send_stream = 1; 495 avdtp_request_can_send_now_initiator(stream_endpoint->connection, stream_endpoint->l2cap_media_cid); 496 } 497 498 int a2dp_max_media_payload_size(uint8_t local_seid){ 499 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 500 if (!stream_endpoint) { 501 log_error("no stream_endpoint found for seid %d", local_seid); 502 return 0; 503 } 504 if (stream_endpoint->l2cap_media_cid == 0){ 505 log_error("no media cid found for seid %d", local_seid); 506 return 0; 507 } 508 return l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid) - AVDTP_MEDIA_PAYLOAD_HEADER_SIZE; 509 } 510 511 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){ 512 if (size < num_bytes_to_copy + 1){ 513 log_error("small outgoing buffer: buffer size %u, but need %u", size, num_bytes_to_copy + 1); 514 return; 515 } 516 517 int pos = *offset; 518 media_packet[pos++] = num_frames; // (fragmentation << 7) | (starting_packet << 6) | (last_packet << 5) | num_frames; 519 memcpy(media_packet + pos, storage, num_bytes_to_copy); 520 pos += num_bytes_to_copy; 521 *offset = pos; 522 } 523 524 int a2dp_source_stream_send_media_payload(uint8_t local_seid, uint8_t * storage, int num_bytes_to_copy, uint8_t num_frames, uint8_t marker){ 525 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 526 if (!stream_endpoint) { 527 log_error("no stream_endpoint found for seid %d", local_seid); 528 return 0; 529 } 530 531 if (stream_endpoint->l2cap_media_cid == 0){ 532 log_error("no media cid found for seid %d", local_seid); 533 return 0; 534 } 535 536 int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 537 int offset = 0; 538 539 l2cap_reserve_packet_buffer(); 540 uint8_t * media_packet = l2cap_get_outgoing_buffer(); 541 //int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 542 a2dp_source_setup_media_header(media_packet, size, &offset, marker, stream_endpoint->sequence_number); 543 a2dp_source_copy_media_payload(media_packet, size, &offset, storage, num_bytes_to_copy, num_frames); 544 stream_endpoint->sequence_number++; 545 l2cap_send_prepared(stream_endpoint->l2cap_media_cid, offset); 546 return size; 547 } 548