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 if (status != 0){ 185 log_info("AVDTP_SUBEVENT_SIGNALING_CONNECTION failed status %d ---", status); 186 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, sc.remote_addr, 0, 0, status); 187 break; 188 } 189 190 sc.active_remote_sep = NULL; 191 next_remote_sep_index_to_query = 0; 192 if (sc.local_stream_endpoint) { 193 app_state = A2DP_CONNECTED; 194 uint8_t event[11]; 195 int pos = 0; 196 event[pos++] = HCI_EVENT_A2DP_META; 197 event[pos++] = sizeof(event) - 2; 198 event[pos++] = A2DP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED; 199 little_endian_store_16(event, pos, cid); 200 pos += 2; 201 reverse_bd_addr(event+pos, sc.remote_addr); 202 pos += 6; 203 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 204 return; 205 } 206 207 log_info("A2DP_SUBEVENT_SIGNALING_CONNECTION established avdtp_cid 0x%02x ---", a2dp_source_context.avdtp_cid); 208 209 app_state = A2DP_W2_DISCOVER_SEPS; 210 avdtp_source_discover_stream_endpoints(cid); 211 break; 212 213 case AVDTP_SUBEVENT_SIGNALING_SEP_FOUND: 214 break; 215 216 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CAPABILITY:{ 217 if (!sc.local_stream_endpoint) { 218 // printf("local seid %d \n", avdtp_subevent_signaling_media_codec_sbc_capability_get_local_seid(packet)); 219 return; 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("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("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; 292 293 sc.active_remote_sep = avdtp_source_remote_sep(cid, next_remote_sep_index_to_query++); 294 if (!sc.active_remote_sep) { 295 app_state = A2DP_IDLE; 296 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, sc.remote_addr, 0, 0, AVDTP_SEID_DOES_NOT_EXIST); 297 break; 298 } 299 // printf("Query get caps for seid %d\n", sc.active_remote_sep->seid); 300 avdtp_source_get_capabilities(cid, sc.active_remote_sep->seid); 301 break; 302 case A2DP_W2_GET_CAPABILITIES: 303 case A2DP_W2_GET_ALL_CAPABILITIES: 304 if (next_remote_sep_index_to_query < avdtp_source_remote_seps_num(cid)){ 305 sc.active_remote_sep = avdtp_source_remote_sep(cid, next_remote_sep_index_to_query++); 306 // printf("Query get caps for seid %d\n", sc.active_remote_sep->seid); 307 avdtp_source_get_capabilities(cid, sc.active_remote_sep->seid); 308 } else { 309 // printf("No more remote seps found\n"); 310 app_state = A2DP_IDLE; 311 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, sc.remote_addr, 0, 0, AVDTP_SEID_DOES_NOT_EXIST); 312 } 313 break; 314 case A2DP_W2_SET_CONFIGURATION:{ 315 if (!sc.local_stream_endpoint) return; 316 app_state = A2DP_W4_SET_CONFIGURATION; 317 log_info("A2DP configuration is set, wait for A2DP_W2_OPEN_STREAM_WITH_SEID ... "); 318 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); 319 break; 320 } 321 case A2DP_W2_OPEN_STREAM_WITH_SEID:{ 322 log_info("A2DP open stream "); 323 app_state = A2DP_W4_OPEN_STREAM_WITH_SEID; 324 avdtp_source_open_stream(cid, avdtp_stream_endpoint_seid(sc.local_stream_endpoint), sc.active_remote_sep->seid); 325 break; 326 } 327 case A2DP_STREAMING_OPENED: 328 if (!a2dp_source_context.a2dp_callback) return; 329 switch (signal_identifier){ 330 case AVDTP_SI_START:{ 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_STARTED; 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_SUSPEND:{ 343 uint8_t event[6]; 344 int pos = 0; 345 event[pos++] = HCI_EVENT_A2DP_META; 346 event[pos++] = sizeof(event) - 2; 347 event[pos++] = A2DP_SUBEVENT_STREAM_SUSPENDED; 348 little_endian_store_16(event, pos, cid); 349 pos += 2; 350 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 351 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 352 break; 353 } 354 case AVDTP_SI_ABORT: 355 case AVDTP_SI_CLOSE:{ 356 uint8_t event[6]; 357 int pos = 0; 358 event[pos++] = HCI_EVENT_A2DP_META; 359 event[pos++] = sizeof(event) - 2; 360 event[pos++] = A2DP_SUBEVENT_STREAM_STOPPED; 361 little_endian_store_16(event, pos, cid); 362 pos += 2; 363 log_info("send A2DP_SUBEVENT_STREAM_RELEASED to app"); 364 event[pos++] = avdtp_stream_endpoint_seid(sc.local_stream_endpoint); 365 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 366 break; 367 } 368 default: 369 break; 370 } 371 break; 372 default: 373 app_state = A2DP_IDLE; 374 break; 375 } 376 377 break; 378 case AVDTP_SUBEVENT_SIGNALING_REJECT: 379 app_state = A2DP_IDLE; 380 signal_identifier = avdtp_subevent_signaling_reject_get_signal_identifier(packet); 381 log_info("Rejected %d", signal_identifier); 382 break; 383 case AVDTP_SUBEVENT_SIGNALING_GENERAL_REJECT: 384 app_state = A2DP_IDLE; 385 signal_identifier = avdtp_subevent_signaling_general_reject_get_signal_identifier(packet); 386 log_info("Rejected %d", signal_identifier); 387 break; 388 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_RELEASED:{ 389 app_state = A2DP_IDLE; 390 uint8_t event[6]; 391 int pos = 0; 392 event[pos++] = HCI_EVENT_A2DP_META; 393 event[pos++] = sizeof(event) - 2; 394 event[pos++] = A2DP_SUBEVENT_SIGNALING_CONNECTION_RELEASED; 395 little_endian_store_16(event, pos, avdtp_subevent_streaming_connection_released_get_avdtp_cid(packet)); 396 pos += 2; 397 event[pos++] = avdtp_subevent_streaming_connection_released_get_local_seid(packet); 398 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 399 break; 400 } 401 case AVDTP_SUBEVENT_STREAMING_CONNECTION_RELEASED:{ 402 app_state = A2DP_IDLE; 403 uint8_t event[6]; 404 int pos = 0; 405 event[pos++] = HCI_EVENT_A2DP_META; 406 event[pos++] = sizeof(event) - 2; 407 event[pos++] = A2DP_SUBEVENT_STREAM_RELEASED; 408 little_endian_store_16(event, pos, avdtp_subevent_streaming_connection_released_get_avdtp_cid(packet)); 409 pos += 2; 410 event[pos++] = avdtp_subevent_streaming_connection_released_get_local_seid(packet); 411 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 412 break; 413 } 414 default: 415 app_state = A2DP_IDLE; 416 log_info("not implemented"); 417 break; 418 } 419 } 420 void a2dp_source_register_packet_handler(btstack_packet_handler_t callback){ 421 if (callback == NULL){ 422 log_error("a2dp_source_register_packet_handler called with NULL callback"); 423 return; 424 } 425 avdtp_source_register_packet_handler(&packet_handler); 426 a2dp_source_context.a2dp_callback = callback; 427 } 428 429 void a2dp_source_init(void){ 430 avdtp_source_init(&a2dp_source_context); 431 l2cap_register_service(&packet_handler, BLUETOOTH_PROTOCOL_AVDTP, 0xffff, LEVEL_0); 432 } 433 434 avdtp_stream_endpoint_t * a2dp_source_create_stream_endpoint(avdtp_media_type_t media_type, avdtp_media_codec_type_t media_codec_type, 435 uint8_t * codec_capabilities, uint16_t codec_capabilities_len, 436 uint8_t * media_codec_info, uint16_t media_codec_info_len){ 437 avdtp_stream_endpoint_t * local_stream_endpoint = avdtp_source_create_stream_endpoint(AVDTP_SOURCE, media_type); 438 if (!local_stream_endpoint){ 439 return NULL; 440 } 441 avdtp_source_register_media_transport_category(avdtp_stream_endpoint_seid(local_stream_endpoint)); 442 avdtp_source_register_media_codec_category(avdtp_stream_endpoint_seid(local_stream_endpoint), media_type, media_codec_type, 443 codec_capabilities, codec_capabilities_len); 444 local_stream_endpoint->remote_configuration.media_codec.media_codec_information = media_codec_info; 445 local_stream_endpoint->remote_configuration.media_codec.media_codec_information_len = media_codec_info_len; 446 447 return local_stream_endpoint; 448 } 449 450 uint8_t a2dp_source_establish_stream(bd_addr_t remote_addr, uint8_t loc_seid, uint16_t * a2dp_cid){ 451 sc.local_stream_endpoint = avdtp_stream_endpoint_for_seid(loc_seid, &a2dp_source_context); 452 if (!sc.local_stream_endpoint){ 453 log_error(" no local_stream_endpoint for seid %d", loc_seid); 454 return AVDTP_SEID_DOES_NOT_EXIST; 455 } 456 memcpy(sc.remote_addr, remote_addr, 6); 457 return avdtp_source_connect(remote_addr, a2dp_cid); 458 } 459 460 uint8_t a2dp_source_disconnect(uint16_t a2dp_cid){ 461 return avdtp_disconnect(a2dp_cid, &a2dp_source_context); 462 } 463 464 uint8_t a2dp_source_start_stream(uint16_t a2dp_cid, uint8_t local_seid){ 465 return avdtp_start_stream(a2dp_cid, local_seid, &a2dp_source_context); 466 } 467 468 uint8_t a2dp_source_pause_stream(uint16_t a2dp_cid, uint8_t local_seid){ 469 return avdtp_suspend_stream(a2dp_cid, local_seid, &a2dp_source_context); 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(uint16_t a2dp_cid, 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("A2DP source: no stream_endpoint with seid %d", local_seid); 506 return; 507 } 508 if (a2dp_source_context.avdtp_cid != a2dp_cid){ 509 log_error("A2DP source: a2dp cid 0x%02x not known, expected 0x%02x", a2dp_cid, a2dp_source_context.avdtp_cid); 510 return; 511 } 512 stream_endpoint->send_stream = 1; 513 avdtp_request_can_send_now_initiator(stream_endpoint->connection, stream_endpoint->l2cap_media_cid); 514 } 515 516 int a2dp_max_media_payload_size(uint16_t a2dp_cid, uint8_t local_seid){ 517 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 518 if (!stream_endpoint) { 519 log_error("A2DP source: no stream_endpoint with seid %d", local_seid); 520 return 0; 521 } 522 if (a2dp_source_context.avdtp_cid != a2dp_cid){ 523 log_error("A2DP source: a2dp cid 0x%02x not known, expected 0x%02x", a2dp_cid, a2dp_source_context.avdtp_cid); 524 return 0; 525 } 526 527 if (stream_endpoint->l2cap_media_cid == 0){ 528 log_error("A2DP source: no media connection for seid %d", local_seid); 529 return 0; 530 } 531 return l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid) - AVDTP_MEDIA_PAYLOAD_HEADER_SIZE; 532 } 533 534 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){ 535 if (size < num_bytes_to_copy + 1){ 536 log_error("small outgoing buffer: buffer size %u, but need %u", size, num_bytes_to_copy + 1); 537 return; 538 } 539 540 int pos = *offset; 541 media_packet[pos++] = num_frames; // (fragmentation << 7) | (starting_packet << 6) | (last_packet << 5) | num_frames; 542 memcpy(media_packet + pos, storage, num_bytes_to_copy); 543 pos += num_bytes_to_copy; 544 *offset = pos; 545 } 546 547 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){ 548 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 549 if (!stream_endpoint) { 550 log_error("A2DP source: no stream_endpoint with seid %d", local_seid); 551 return 0; 552 } 553 if (a2dp_source_context.avdtp_cid != a2dp_cid){ 554 log_error("A2DP source: a2dp cid 0x%02x not known, expected 0x%02x", a2dp_cid, a2dp_source_context.avdtp_cid); 555 return 0; 556 } 557 558 if (stream_endpoint->l2cap_media_cid == 0){ 559 log_error("A2DP source: no media connection for seid %d", local_seid); 560 return 0; 561 } 562 563 int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 564 int offset = 0; 565 566 l2cap_reserve_packet_buffer(); 567 uint8_t * media_packet = l2cap_get_outgoing_buffer(); 568 //int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 569 a2dp_source_setup_media_header(media_packet, size, &offset, marker, stream_endpoint->sequence_number); 570 a2dp_source_copy_media_payload(media_packet, size, &offset, storage, num_bytes_to_copy, num_frames); 571 stream_endpoint->sequence_number++; 572 l2cap_send_prepared(stream_endpoint->l2cap_media_cid, offset); 573 return size; 574 } 575