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 61 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 62 63 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){ 64 uint8_t* attribute; 65 de_create_sequence(service); 66 67 // 0x0000 "Service Record Handle" 68 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_SERVICE_RECORD_HANDLE); 69 de_add_number(service, DE_UINT, DE_SIZE_32, service_record_handle); 70 71 // 0x0001 "Service Class ID List" 72 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_SERVICE_CLASS_ID_LIST); 73 attribute = de_push_sequence(service); 74 { 75 de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_AUDIO_SOURCE); 76 } 77 de_pop_sequence(service, attribute); 78 79 // 0x0004 "Protocol Descriptor List" 80 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST); 81 attribute = de_push_sequence(service); 82 { 83 uint8_t* l2cpProtocol = de_push_sequence(attribute); 84 { 85 de_add_number(l2cpProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_L2CAP); 86 de_add_number(l2cpProtocol, DE_UINT, DE_SIZE_16, BLUETOOTH_PROTOCOL_AVDTP); 87 } 88 de_pop_sequence(attribute, l2cpProtocol); 89 90 uint8_t* avProtocol = de_push_sequence(attribute); 91 { 92 de_add_number(avProtocol, DE_UUID, DE_SIZE_16, BLUETOOTH_PROTOCOL_AVDTP); // avProtocol_service 93 de_add_number(avProtocol, DE_UINT, DE_SIZE_16, 0x0103); // version 94 } 95 de_pop_sequence(attribute, avProtocol); 96 } 97 de_pop_sequence(service, attribute); 98 99 // 0x0005 "Public Browse Group" 100 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_BROWSE_GROUP_LIST); // public browse group 101 attribute = de_push_sequence(service); 102 { 103 de_add_number(attribute, DE_UUID, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_PUBLIC_BROWSE_ROOT); 104 } 105 de_pop_sequence(service, attribute); 106 107 // 0x0009 "Bluetooth Profile Descriptor List" 108 de_add_number(service, DE_UINT, DE_SIZE_16, BLUETOOTH_ATTRIBUTE_BLUETOOTH_PROFILE_DESCRIPTOR_LIST); 109 attribute = de_push_sequence(service); 110 { 111 uint8_t *a2dProfile = de_push_sequence(attribute); 112 { 113 de_add_number(a2dProfile, DE_UUID, DE_SIZE_16, BLUETOOTH_SERVICE_CLASS_ADVANCED_AUDIO_DISTRIBUTION); 114 de_add_number(a2dProfile, DE_UINT, DE_SIZE_16, 0x0103); 115 } 116 de_pop_sequence(attribute, a2dProfile); 117 } 118 de_pop_sequence(service, attribute); 119 120 121 // 0x0100 "Service Name" 122 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0100); 123 if (service_name){ 124 de_add_data(service, DE_STRING, strlen(service_name), (uint8_t *) service_name); 125 } else { 126 de_add_data(service, DE_STRING, strlen(default_a2dp_source_service_name), (uint8_t *) default_a2dp_source_service_name); 127 } 128 129 // 0x0100 "Provider Name" 130 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0102); 131 if (service_provider_name){ 132 de_add_data(service, DE_STRING, strlen(service_provider_name), (uint8_t *) service_provider_name); 133 } else { 134 de_add_data(service, DE_STRING, strlen(default_a2dp_source_service_provider_name), (uint8_t *) default_a2dp_source_service_provider_name); 135 } 136 137 // 0x0311 "Supported Features" 138 de_add_number(service, DE_UINT, DE_SIZE_16, 0x0311); 139 de_add_number(service, DE_UINT, DE_SIZE_16, supported_features); 140 } 141 142 143 static void a2dp_streaming_emit_can_send_media_packet_now(btstack_packet_handler_t callback, uint16_t cid, uint8_t seid){ 144 if (!callback) return; 145 uint8_t event[8]; 146 int pos = 0; 147 event[pos++] = HCI_EVENT_A2DP_META; 148 event[pos++] = sizeof(event) - 2; 149 event[pos++] = A2DP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW; 150 little_endian_store_16(event, pos, cid); 151 pos += 2; 152 event[pos++] = seid; 153 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 154 } 155 156 static inline void a2dp_signaling_emit_media_codec_sbc(btstack_packet_handler_t callback, uint8_t * event, uint16_t event_size){ 157 if (!callback) return; 158 if (event_size < 18) return; 159 event[0] = HCI_EVENT_A2DP_META; 160 event[2] = A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION; 161 (*callback)(HCI_EVENT_PACKET, 0, event, event_size); 162 } 163 164 static inline void a2dp_signaling_emit_reject_cmd(btstack_packet_handler_t callback, uint8_t * event, uint16_t event_size){ 165 if (!callback) return; 166 if (event_size < 18) return; 167 event[0] = HCI_EVENT_A2DP_META; 168 event[2] = A2DP_SUBEVENT_COMMAND_REJECTED; 169 (*callback)(HCI_EVENT_PACKET, 0, event, event_size); 170 } 171 172 static void a2dp_signaling_emit_connection_established(btstack_packet_handler_t callback, uint16_t cid, bd_addr_t addr, uint8_t status){ 173 if (!callback) return; 174 uint8_t event[12]; 175 int pos = 0; 176 event[pos++] = HCI_EVENT_A2DP_META; 177 event[pos++] = sizeof(event) - 2; 178 event[pos++] = A2DP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED; 179 little_endian_store_16(event, pos, cid); 180 pos += 2; 181 reverse_bd_addr(addr,&event[pos]); 182 pos += 6; 183 event[pos++] = status; 184 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 185 } 186 187 static void a2dp_signaling_emit_control_command(btstack_packet_handler_t callback, uint16_t cid, uint8_t local_seid, uint8_t cmd){ 188 if (!callback) return; 189 uint8_t event[6]; 190 int pos = 0; 191 event[pos++] = HCI_EVENT_A2DP_META; 192 event[pos++] = sizeof(event) - 2; 193 event[pos++] = cmd; 194 little_endian_store_16(event, pos, cid); 195 pos += 2; 196 event[pos++] = local_seid; 197 (*callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 198 } 199 200 static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 201 UNUSED(channel); 202 UNUSED(size); 203 204 uint8_t signal_identifier; 205 uint8_t status; 206 uint8_t local_seid; 207 uint8_t remote_seid; 208 uint16_t cid; 209 bd_addr_t address; 210 211 if (packet_type != HCI_EVENT_PACKET) return; 212 if (hci_event_packet_get_type(packet) != HCI_EVENT_AVDTP_META) return; 213 214 switch (packet[2]){ 215 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED:{ 216 avdtp_subevent_signaling_connection_established_get_bd_addr(packet, sc.remote_addr); 217 cid = avdtp_subevent_signaling_connection_established_get_avdtp_cid(packet); 218 status = avdtp_subevent_signaling_connection_established_get_status(packet); 219 220 if (status != 0){ 221 log_info("AVDTP_SUBEVENT_SIGNALING_CONNECTION failed status %d ---", status); 222 app_state = A2DP_IDLE; 223 a2dp_signaling_emit_connection_established(a2dp_source_context.a2dp_callback, cid, sc.remote_addr, status); 224 break; 225 } 226 log_info("A2DP_SUBEVENT_SIGNALING_CONNECTION established avdtp_cid 0x%02x ---", a2dp_source_context.avdtp_cid); 227 sc.active_remote_sep = NULL; 228 sc.active_remote_sep_index = 0; 229 app_state = A2DP_W2_DISCOVER_SEPS; 230 a2dp_signaling_emit_connection_established(a2dp_source_context.a2dp_callback, cid, sc.remote_addr, status); 231 avdtp_source_discover_stream_endpoints(cid); 232 break; 233 } 234 case AVDTP_SUBEVENT_SIGNALING_SEP_FOUND: 235 break; 236 237 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CAPABILITY:{ 238 log_info("A2DP received SBC capability."); 239 if (!sc.local_stream_endpoint) { 240 log_error("invalid local seid %d", avdtp_subevent_signaling_media_codec_sbc_capability_get_local_seid(packet)); 241 return; 242 } 243 log_info("A2DP received SBC capability."); 244 245 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)); 246 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)); 247 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)); 248 uint8_t subbands = avdtp_choose_sbc_subbands(sc.local_stream_endpoint, avdtp_subevent_signaling_media_codec_sbc_capability_get_subbands_bitmap(packet)); 249 250 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)); 251 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)); 252 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)); 253 254 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[0] = (sampling_frequency << 4) | channel_mode; 255 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[1] = (block_length << 4) | (subbands << 2) | allocation_method; 256 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[2] = min_bitpool_value; 257 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_information[3] = max_bitpool_value; 258 259 sc.local_stream_endpoint->remote_configuration_bitmap = store_bit16(sc.local_stream_endpoint->remote_configuration_bitmap, AVDTP_MEDIA_CODEC, 1); 260 sc.local_stream_endpoint->remote_configuration.media_codec.media_type = AVDTP_AUDIO; 261 sc.local_stream_endpoint->remote_configuration.media_codec.media_codec_type = AVDTP_CODEC_SBC; 262 263 app_state = A2DP_W2_SET_CONFIGURATION; 264 break; 265 } 266 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_OTHER_CAPABILITY: 267 log_info("received non SBC codec. not implemented"); 268 break; 269 270 case AVDTP_SUBEVENT_SIGNALING_MEDIA_TRANSPORT_CAPABILITY: 271 log_info("received, but not forwarded: AVDTP_SUBEVENT_SIGNALING_MEDIA_TRANSPORT_CAPABILITY, remote seid %d\n", avdtp_subevent_signaling_media_transport_capability_get_remote_seid(packet)); 272 break; 273 case AVDTP_SUBEVENT_SIGNALING_REPORTING_CAPABILITY: 274 log_info("received, but not forwarded: AVDTP_SUBEVENT_SIGNALING_REPORTING_CAPABILITY, remote seid %d\n", avdtp_subevent_signaling_reporting_capability_get_remote_seid(packet)); 275 break; 276 case AVDTP_SUBEVENT_SIGNALING_DELAY_REPORTING_CAPABILITY: 277 log_info("received, but not forwarded: AVDTP_SUBEVENT_SIGNALING_DELAY_REPORTING_CAPABILITY, remote seid %d\n", avdtp_subevent_signaling_delay_reporting_capability_get_remote_seid(packet)); 278 break; 279 case AVDTP_SUBEVENT_SIGNALING_RECOVERY_CAPABILITY: 280 log_info("received, but not forwarded: AVDTP_SUBEVENT_SIGNALING_RECOVERY_CAPABILITY, remote seid %d\n", avdtp_subevent_signaling_recovery_capability_get_remote_seid(packet)); 281 break; 282 case AVDTP_SUBEVENT_SIGNALING_CONTENT_PROTECTION_CAPABILITY: 283 log_info("received, but not forwarded: AVDTP_SUBEVENT_SIGNALING_CONTENT_PROTECTION_CAPABILITY, remote seid %d\n", avdtp_subevent_signaling_content_protection_capability_get_remote_seid(packet)); 284 break; 285 case AVDTP_SUBEVENT_SIGNALING_HEADER_COMPRESSION_CAPABILITY: 286 log_info("received, but not forwarded: AVDTP_SUBEVENT_SIGNALING_HEADER_COMPRESSION_CAPABILITY, remote seid %d\n", avdtp_subevent_signaling_header_compression_capability_get_remote_seid(packet)); 287 break; 288 case AVDTP_SUBEVENT_SIGNALING_MULTIPLEXING_CAPABILITY: 289 log_info("received, but not forwarded: AVDTP_SUBEVENT_SIGNALING_MULTIPLEXING_CAPABILITY, remote seid %d\n", avdtp_subevent_signaling_multiplexing_capability_get_remote_seid(packet)); 290 break; 291 case AVDTP_SUBEVENT_SIGNALING_CAPABILITY_DONE: 292 break; 293 294 case AVDTP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION:{ 295 // TODO check cid 296 sc.sampling_frequency = avdtp_subevent_signaling_media_codec_sbc_configuration_get_sampling_frequency(packet); 297 sc.block_length = avdtp_subevent_signaling_media_codec_sbc_configuration_get_block_length(packet); 298 sc.subbands = avdtp_subevent_signaling_media_codec_sbc_configuration_get_subbands(packet); 299 sc.allocation_method = avdtp_subevent_signaling_media_codec_sbc_configuration_get_allocation_method(packet) - 1; 300 sc.max_bitpool_value = avdtp_subevent_signaling_media_codec_sbc_configuration_get_max_bitpool_value(packet); 301 sc.channel_mode = avdtp_subevent_signaling_media_codec_sbc_configuration_get_channel_mode(packet); 302 // TODO: deal with reconfigure: avdtp_subevent_signaling_media_codec_sbc_configuration_get_reconfigure(packet); 303 log_info("A2DP received SBC Config: sample rate %u, max bitpool %u.", sc.sampling_frequency, sc.max_bitpool_value); 304 app_state = A2DP_W2_OPEN_STREAM_WITH_SEID; 305 a2dp_signaling_emit_media_codec_sbc(a2dp_source_context.a2dp_callback, packet, size); 306 break; 307 } 308 309 case AVDTP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW: 310 cid = avdtp_subevent_streaming_can_send_media_packet_now_get_avdtp_cid(packet); 311 a2dp_streaming_emit_can_send_media_packet_now(a2dp_source_context.a2dp_callback, cid, 0); 312 break; 313 314 case AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED: 315 avdtp_subevent_streaming_connection_established_get_bd_addr(packet, address); 316 status = avdtp_subevent_streaming_connection_established_get_status(packet); 317 cid = avdtp_subevent_streaming_connection_established_get_avdtp_cid(packet); 318 remote_seid = avdtp_subevent_streaming_connection_established_get_remote_seid(packet); 319 local_seid = avdtp_subevent_streaming_connection_established_get_local_seid(packet); 320 if (status != 0){ 321 log_info("AVDTP_SUBEVENT_STREAMING_CONNECTION could not be established, avdtp_cid 0x%02x, status 0x%02x ---", cid, status); 322 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, address, local_seid, remote_seid, status); 323 break; 324 } 325 log_info("AVDTP_SUBEVENT_STREAMING_CONNECTION_ESTABLISHED --- avdtp_cid 0x%02x, local seid %d, remote seid %d", cid, local_seid, remote_seid); 326 app_state = A2DP_STREAMING_OPENED; 327 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, address, local_seid, remote_seid, 0); 328 break; 329 330 case AVDTP_SUBEVENT_SIGNALING_ACCEPT: 331 // TODO check cid 332 signal_identifier = avdtp_subevent_signaling_accept_get_signal_identifier(packet); 333 cid = avdtp_subevent_signaling_accept_get_avdtp_cid(packet); 334 log_info("A2DP Accepted %d, state %d", signal_identifier, app_state); 335 336 switch (app_state){ 337 case A2DP_W2_DISCOVER_SEPS: 338 case A2DP_W2_GET_CAPABILITIES: 339 case A2DP_W2_GET_ALL_CAPABILITIES: 340 app_state = A2DP_W2_GET_ALL_CAPABILITIES; 341 sc.active_remote_sep = avdtp_source_remote_sep(cid, sc.active_remote_sep_index++); 342 if (!sc.active_remote_sep) { 343 app_state = A2DP_IDLE; 344 a2dp_streaming_emit_connection_established(a2dp_source_context.a2dp_callback, cid, sc.remote_addr, 0, 0, AVDTP_SEID_DOES_NOT_EXIST); 345 break; 346 } 347 avdtp_source_get_capabilities(cid, sc.active_remote_sep->seid); 348 break; 349 case A2DP_W2_SET_CONFIGURATION:{ 350 if (!sc.local_stream_endpoint) return; 351 log_info("A2DP initiate set configuration locally and wait for response ... "); 352 app_state = A2DP_IDLE; 353 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); 354 break; 355 } 356 case A2DP_W2_OPEN_STREAM_WITH_SEID:{ 357 log_info("A2DP open stream "); 358 app_state = A2DP_W4_OPEN_STREAM_WITH_SEID; 359 avdtp_source_open_stream(cid, avdtp_stream_endpoint_seid(sc.local_stream_endpoint), sc.active_remote_sep->seid); 360 break; 361 } 362 case A2DP_STREAMING_OPENED: 363 if (!a2dp_source_context.a2dp_callback) return; 364 switch (signal_identifier){ 365 case AVDTP_SI_START: 366 a2dp_signaling_emit_control_command(a2dp_source_context.a2dp_callback, cid, avdtp_stream_endpoint_seid(sc.local_stream_endpoint), A2DP_SUBEVENT_STREAM_STARTED); 367 break; 368 case AVDTP_SI_SUSPEND: 369 a2dp_signaling_emit_control_command(a2dp_source_context.a2dp_callback, cid, avdtp_stream_endpoint_seid(sc.local_stream_endpoint), A2DP_SUBEVENT_STREAM_SUSPENDED); 370 break; 371 case AVDTP_SI_ABORT: 372 case AVDTP_SI_CLOSE: 373 a2dp_signaling_emit_control_command(a2dp_source_context.a2dp_callback, cid, avdtp_stream_endpoint_seid(sc.local_stream_endpoint), A2DP_SUBEVENT_STREAM_STOPPED); 374 break; 375 default: 376 break; 377 } 378 break; 379 default: 380 app_state = A2DP_IDLE; 381 break; 382 } 383 384 break; 385 case AVDTP_SUBEVENT_SIGNALING_REJECT: 386 case AVDTP_SUBEVENT_SIGNALING_GENERAL_REJECT: 387 app_state = A2DP_IDLE; 388 a2dp_signaling_emit_reject_cmd(a2dp_source_context.a2dp_callback, packet, size); 389 break; 390 case AVDTP_SUBEVENT_SIGNALING_CONNECTION_RELEASED:{ 391 app_state = A2DP_IDLE; 392 uint8_t event[6]; 393 int pos = 0; 394 event[pos++] = HCI_EVENT_A2DP_META; 395 event[pos++] = sizeof(event) - 2; 396 event[pos++] = A2DP_SUBEVENT_SIGNALING_CONNECTION_RELEASED; 397 little_endian_store_16(event, pos, avdtp_subevent_streaming_connection_released_get_avdtp_cid(packet)); 398 pos += 2; 399 event[pos++] = avdtp_subevent_streaming_connection_released_get_local_seid(packet); 400 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 401 break; 402 } 403 case AVDTP_SUBEVENT_STREAMING_CONNECTION_RELEASED:{ 404 app_state = A2DP_IDLE; 405 uint8_t event[6]; 406 int pos = 0; 407 event[pos++] = HCI_EVENT_A2DP_META; 408 event[pos++] = sizeof(event) - 2; 409 event[pos++] = A2DP_SUBEVENT_STREAM_RELEASED; 410 little_endian_store_16(event, pos, avdtp_subevent_streaming_connection_released_get_avdtp_cid(packet)); 411 pos += 2; 412 event[pos++] = avdtp_subevent_streaming_connection_released_get_local_seid(packet); 413 (*a2dp_source_context.a2dp_callback)(HCI_EVENT_PACKET, 0, event, sizeof(event)); 414 break; 415 } 416 default: 417 app_state = A2DP_IDLE; 418 log_info("not implemented"); 419 break; 420 } 421 } 422 void a2dp_source_register_packet_handler(btstack_packet_handler_t callback){ 423 if (callback == NULL){ 424 log_error("a2dp_source_register_packet_handler called with NULL callback"); 425 return; 426 } 427 avdtp_source_register_packet_handler(&packet_handler); 428 a2dp_source_context.a2dp_callback = callback; 429 } 430 431 void a2dp_source_init(void){ 432 avdtp_source_init(&a2dp_source_context); 433 l2cap_register_service(&packet_handler, BLUETOOTH_PROTOCOL_AVDTP, 0xffff, LEVEL_0); 434 } 435 436 uint8_t a2dp_source_create_stream_endpoint(avdtp_media_type_t media_type, avdtp_media_codec_type_t media_codec_type, 437 uint8_t * codec_capabilities, uint16_t codec_capabilities_len, 438 uint8_t * media_codec_info, uint16_t media_codec_info_len, uint8_t * local_seid){ 439 *local_seid = 0; 440 avdtp_stream_endpoint_t * local_stream_endpoint = avdtp_source_create_stream_endpoint(AVDTP_SOURCE, media_type); 441 if (!local_stream_endpoint){ 442 return BTSTACK_MEMORY_ALLOC_FAILED; 443 } 444 *local_seid = avdtp_local_seid(local_stream_endpoint); 445 avdtp_source_register_media_transport_category(avdtp_stream_endpoint_seid(local_stream_endpoint)); 446 avdtp_source_register_media_codec_category(avdtp_stream_endpoint_seid(local_stream_endpoint), media_type, media_codec_type, 447 codec_capabilities, codec_capabilities_len); 448 local_stream_endpoint->remote_configuration.media_codec.media_codec_information = media_codec_info; 449 local_stream_endpoint->remote_configuration.media_codec.media_codec_information_len = media_codec_info_len; 450 return ERROR_CODE_SUCCESS; 451 } 452 453 uint8_t a2dp_source_establish_stream(bd_addr_t remote_addr, uint8_t loc_seid, uint16_t * a2dp_cid){ 454 sc.local_stream_endpoint = avdtp_stream_endpoint_for_seid(loc_seid, &a2dp_source_context); 455 if (!sc.local_stream_endpoint){ 456 log_error(" no local_stream_endpoint for seid %d", loc_seid); 457 return AVDTP_SEID_DOES_NOT_EXIST; 458 } 459 memcpy(sc.remote_addr, remote_addr, 6); 460 return avdtp_source_connect(remote_addr, a2dp_cid); 461 } 462 463 uint8_t a2dp_source_disconnect(uint16_t a2dp_cid){ 464 return avdtp_disconnect(a2dp_cid, &a2dp_source_context); 465 } 466 467 uint8_t a2dp_source_start_stream(uint16_t a2dp_cid, uint8_t local_seid){ 468 return avdtp_start_stream(a2dp_cid, local_seid, &a2dp_source_context); 469 } 470 471 uint8_t a2dp_source_pause_stream(uint16_t a2dp_cid, uint8_t local_seid){ 472 return avdtp_suspend_stream(a2dp_cid, local_seid, &a2dp_source_context); 473 } 474 475 static void a2dp_source_setup_media_header(uint8_t * media_packet, int size, int *offset, uint8_t marker, uint16_t sequence_number){ 476 if (size < AVDTP_MEDIA_PAYLOAD_HEADER_SIZE){ 477 log_error("small outgoing buffer"); 478 return; 479 } 480 481 uint8_t rtp_version = 2; 482 uint8_t padding = 0; 483 uint8_t extension = 0; 484 uint8_t csrc_count = 0; 485 uint8_t payload_type = 0x60; 486 // uint16_t sequence_number = stream_endpoint->sequence_number; 487 uint32_t timestamp = btstack_run_loop_get_time_ms(); 488 uint32_t ssrc = 0x11223344; 489 490 // rtp header (min size 12B) 491 int pos = 0; 492 // int mtu = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 493 494 media_packet[pos++] = (rtp_version << 6) | (padding << 5) | (extension << 4) | csrc_count; 495 media_packet[pos++] = (marker << 1) | payload_type; 496 big_endian_store_16(media_packet, pos, sequence_number); 497 pos += 2; 498 big_endian_store_32(media_packet, pos, timestamp); 499 pos += 4; 500 big_endian_store_32(media_packet, pos, ssrc); // only used for multicast 501 pos += 4; 502 *offset = pos; 503 } 504 505 void a2dp_source_stream_endpoint_request_can_send_now(uint16_t a2dp_cid, uint8_t local_seid){ 506 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 507 if (!stream_endpoint) { 508 log_error("A2DP source: no stream_endpoint with seid %d", local_seid); 509 return; 510 } 511 if (a2dp_source_context.avdtp_cid != a2dp_cid){ 512 log_error("A2DP source: a2dp cid 0x%02x not known, expected 0x%02x", a2dp_cid, a2dp_source_context.avdtp_cid); 513 return; 514 } 515 stream_endpoint->send_stream = 1; 516 avdtp_request_can_send_now_initiator(stream_endpoint->connection, stream_endpoint->l2cap_media_cid); 517 } 518 519 int a2dp_max_media_payload_size(uint16_t a2dp_cid, uint8_t local_seid){ 520 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 521 if (!stream_endpoint) { 522 log_error("A2DP source: no stream_endpoint with seid %d", local_seid); 523 return 0; 524 } 525 if (a2dp_source_context.avdtp_cid != a2dp_cid){ 526 log_error("A2DP source: a2dp cid 0x%02x not known, expected 0x%02x", a2dp_cid, a2dp_source_context.avdtp_cid); 527 return 0; 528 } 529 530 if (stream_endpoint->l2cap_media_cid == 0){ 531 log_error("A2DP source: no media connection for seid %d", local_seid); 532 return 0; 533 } 534 return l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid) - AVDTP_MEDIA_PAYLOAD_HEADER_SIZE; 535 } 536 537 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){ 538 if (size < num_bytes_to_copy + 1){ 539 log_error("small outgoing buffer: buffer size %u, but need %u", size, num_bytes_to_copy + 1); 540 return; 541 } 542 543 int pos = *offset; 544 media_packet[pos++] = num_frames; // (fragmentation << 7) | (starting_packet << 6) | (last_packet << 5) | num_frames; 545 memcpy(media_packet + pos, storage, num_bytes_to_copy); 546 pos += num_bytes_to_copy; 547 *offset = pos; 548 } 549 550 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){ 551 avdtp_stream_endpoint_t * stream_endpoint = avdtp_stream_endpoint_for_seid(local_seid, &a2dp_source_context); 552 if (!stream_endpoint) { 553 log_error("A2DP source: no stream_endpoint with seid %d", local_seid); 554 return 0; 555 } 556 if (a2dp_source_context.avdtp_cid != a2dp_cid){ 557 log_error("A2DP source: a2dp cid 0x%02x not known, expected 0x%02x", a2dp_cid, a2dp_source_context.avdtp_cid); 558 return 0; 559 } 560 561 if (stream_endpoint->l2cap_media_cid == 0){ 562 log_error("A2DP source: no media connection for seid %d", local_seid); 563 return 0; 564 } 565 566 int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 567 int offset = 0; 568 569 l2cap_reserve_packet_buffer(); 570 uint8_t * media_packet = l2cap_get_outgoing_buffer(); 571 //int size = l2cap_get_remote_mtu_for_local_cid(stream_endpoint->l2cap_media_cid); 572 a2dp_source_setup_media_header(media_packet, size, &offset, marker, stream_endpoint->sequence_number); 573 a2dp_source_copy_media_payload(media_packet, size, &offset, storage, num_bytes_to_copy, num_frames); 574 stream_endpoint->sequence_number++; 575 l2cap_send_prepared(stream_endpoint->l2cap_media_cid, offset); 576 return size; 577 } 578