1 /* 2 * Copyright (C) 2016 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN 24 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "a2dp_source_demo.c" 39 40 /* 41 * a2dp_source_demo.c 42 */ 43 44 // ***************************************************************************** 45 /* EXAMPLE_START(a2dp_source_demo): A2DP Source - Stream Audio and Control Volume 46 * 47 * @text This A2DP Source example demonstrates how to send an audio data stream 48 * to a remote A2DP Sink device and how to switch between two audio data sources. 49 * In addition, the AVRCP Target is used to answer queries on currently played media, 50 * as well as to handle remote playback control, i.e. play, stop, repeat, etc. If HAVE_BTSTACK_STDIN 51 * is set, press SPACE on the console to show the available AVDTP and AVRCP commands. 52 * 53 * @text To test with a remote device, e.g. a Bluetooth speaker, 54 * set the device_addr_string to the Bluetooth address of your 55 * remote device in the code, and use the UI to connect and start playback. 56 * 57 * @text For more info on BTstack audio, see our blog post 58 * [A2DP Sink and Source on STM32 F4 Discovery Board](http://bluekitchen-gmbh.com/a2dp-sink-and-source-on-stm32-f4-discovery-board/). 59 * 60 */ 61 // ***************************************************************************** 62 63 64 #include <stdint.h> 65 #include <stdio.h> 66 #include <inttypes.h> 67 #include <string.h> 68 69 #include "btstack.h" 70 #include "hxcmod.h" 71 #include "mods/mod.h" 72 73 // logarithmic volume reduction, samples are divided by 2^x 74 // #define VOLUME_REDUCTION 3 75 76 //#define AVRCP_BROWSING_ENABLED 77 78 // select preferred audio sampling rate: 44100 or 48000 79 #define A2DP_SOURCE_DEMO_PREFERRED_SAMPLING_RATE 44100 80 81 #define NUM_CHANNELS 2 82 #define BYTES_PER_AUDIO_SAMPLE (2*NUM_CHANNELS) 83 #define AUDIO_TIMEOUT_MS 10 84 #define TABLE_SIZE_441HZ 100 85 86 #define SBC_STORAGE_SIZE 1030 87 88 typedef enum { 89 STREAM_SINE = 0, 90 STREAM_MOD, 91 STREAM_PTS_TEST 92 } stream_data_source_t; 93 94 typedef struct { 95 uint16_t a2dp_cid; 96 uint8_t local_seid; 97 uint8_t remote_seid; 98 uint8_t stream_opened; 99 uint16_t avrcp_cid; 100 101 uint32_t time_audio_data_sent; // ms 102 uint32_t acc_num_missed_samples; 103 uint32_t samples_ready; 104 btstack_timer_source_t audio_timer; 105 uint8_t streaming; 106 int max_media_payload_size; 107 uint32_t rtp_timestamp; 108 109 uint8_t sbc_storage[SBC_STORAGE_SIZE]; 110 uint16_t sbc_storage_count; 111 uint8_t sbc_ready_to_send; 112 113 uint8_t volume; 114 } a2dp_media_sending_context_t; 115 116 static uint8_t media_sbc_codec_capabilities[] = { 117 (AVDTP_SBC_44100 << 4) | (AVDTP_SBC_48000 << 4) | AVDTP_SBC_STEREO, 118 0xFF,//(AVDTP_SBC_BLOCK_LENGTH_16 << 4) | (AVDTP_SBC_SUBBANDS_8 << 2) | AVDTP_SBC_ALLOCATION_METHOD_LOUDNESS, 119 2, 53 120 }; 121 122 // input signal: pre-computed int16 sine wave, 44100 Hz at 441 Hz 123 static const int16_t sine_int16_44100[] = { 124 0, 2057, 4107, 6140, 8149, 10126, 12062, 13952, 15786, 17557, 125 19260, 20886, 22431, 23886, 25247, 26509, 27666, 28714, 29648, 30466, 126 31163, 31738, 32187, 32509, 32702, 32767, 32702, 32509, 32187, 31738, 127 31163, 30466, 29648, 28714, 27666, 26509, 25247, 23886, 22431, 20886, 128 19260, 17557, 15786, 13952, 12062, 10126, 8149, 6140, 4107, 2057, 129 0, -2057, -4107, -6140, -8149, -10126, -12062, -13952, -15786, -17557, 130 -19260, -20886, -22431, -23886, -25247, -26509, -27666, -28714, -29648, -30466, 131 -31163, -31738, -32187, -32509, -32702, -32767, -32702, -32509, -32187, -31738, 132 -31163, -30466, -29648, -28714, -27666, -26509, -25247, -23886, -22431, -20886, 133 -19260, -17557, -15786, -13952, -12062, -10126, -8149, -6140, -4107, -2057, 134 }; 135 136 static const int num_samples_sine_int16_44100 = sizeof(sine_int16_44100) / 2; 137 138 // input signal: pre-computed int16 sine wave, 48000 Hz at 441 Hz 139 static const int16_t sine_int16_48000[] = { 140 0, 1905, 3804, 5690, 7557, 9398, 11207, 12978, 14706, 16383, 141 18006, 19567, 21062, 22486, 23834, 25101, 26283, 27376, 28377, 29282, 142 30087, 30791, 31390, 31884, 32269, 32545, 32712, 32767, 32712, 32545, 143 32269, 31884, 31390, 30791, 30087, 29282, 28377, 27376, 26283, 25101, 144 23834, 22486, 21062, 19567, 18006, 16383, 14706, 12978, 11207, 9398, 145 7557, 5690, 3804, 1905, 0, -1905, -3804, -5690, -7557, -9398, 146 -11207, -12978, -14706, -16384, -18006, -19567, -21062, -22486, -23834, -25101, 147 -26283, -27376, -28377, -29282, -30087, -30791, -31390, -31884, -32269, -32545, 148 -32712, -32767, -32712, -32545, -32269, -31884, -31390, -30791, -30087, -29282, 149 -28377, -27376, -26283, -25101, -23834, -22486, -21062, -19567, -18006, -16384, 150 -14706, -12978, -11207, -9398, -7557, -5690, -3804, -1905, }; 151 152 static const int num_samples_sine_int16_48000 = sizeof(sine_int16_48000) / 2; 153 154 static const int A2DP_SOURCE_DEMO_INQUIRY_DURATION_1280MS = 12; 155 156 typedef struct { 157 int reconfigure; 158 159 int num_channels; 160 int sampling_frequency; 161 int block_length; 162 int subbands; 163 int min_bitpool_value; 164 int max_bitpool_value; 165 btstack_sbc_channel_mode_t channel_mode; 166 btstack_sbc_allocation_method_t allocation_method; 167 } media_codec_configuration_sbc_t; 168 169 static btstack_packet_callback_registration_t hci_event_callback_registration; 170 171 // Minijambox: 172 static const char * device_addr_string = "00:21:3C:AC:F7:38"; 173 174 static bd_addr_t device_addr; 175 static bool scan_active; 176 177 static uint8_t sdp_a2dp_source_service_buffer[150]; 178 static uint8_t sdp_avrcp_target_service_buffer[200]; 179 static uint8_t sdp_avrcp_controller_service_buffer[200]; 180 static uint8_t device_id_sdp_service_buffer[100]; 181 182 static media_codec_configuration_sbc_t sbc_configuration; 183 184 static const btstack_sbc_encoder_t * sbc_encoder_instance; 185 static btstack_sbc_encoder_bluedroid_t sbc_encoder_state; 186 187 static uint8_t media_sbc_codec_configuration[4]; 188 static a2dp_media_sending_context_t media_tracker; 189 190 static stream_data_source_t data_source; 191 192 static int sine_phase; 193 static int current_sample_rate = 44100; 194 static int new_sample_rate = 44100; 195 196 static int hxcmod_initialized; 197 static modcontext mod_context; 198 static tracker_buffer_state trkbuf; 199 200 /* AVRCP Target context START */ 201 202 typedef struct { 203 uint8_t track_id[8]; 204 uint32_t song_length_ms; 205 avrcp_playback_status_t status; 206 uint32_t song_position_ms; // 0xFFFFFFFF if not supported 207 } avrcp_play_status_info_t; 208 209 // python -c "print('a'*512)" 210 static const char title[] = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"; 211 212 avrcp_track_t tracks[] = { 213 {{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}, 1, "Sine", "Generated", "A2DP Source Demo", "monotone", 12345, 6789}, 214 {{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}, 2, "Nao-deceased", "Decease", "A2DP Source Demo", "vivid", 12345, 6789}, 215 {{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03}, 3, (char *)title, "Decease", "A2DP Source Demo", "vivid", 12345, 6789}, 216 }; 217 int current_track_index; 218 avrcp_play_status_info_t play_info; 219 220 /* AVRCP Target context END */ 221 222 /* @section Main Application Setup 223 * 224 * @text The Listing MainConfiguration shows how to setup AD2P Source and AVRCP services. 225 * Besides calling init() method for each service, you'll also need to register several packet handlers: 226 * - hci_packet_handler - handles legacy pairing, here by using fixed '0000' pin code. 227 * - a2dp_source_packet_handler - handles events on stream connection status (established, released), the media codec configuration, and, the commands on stream itself (open, pause, stopp). 228 * - avrcp_packet_handler - receives connect/disconnect event. 229 * - avrcp_controller_packet_handler - receives answers for sent AVRCP commands. 230 * - avrcp_target_packet_handler - receives AVRCP commands, and registered notifications. 231 * - stdin_process - used to trigger AVRCP commands to the A2DP Source device, such are get now playing info, start, stop, volume control. Requires HAVE_BTSTACK_STDIN. 232 * 233 * @text To announce A2DP Source and AVRCP services, you need to create corresponding 234 * SDP records and register them with the SDP service. 235 */ 236 237 /* LISTING_START(MainConfiguration): Setup Audio Source and AVRCP Target services */ 238 static void hci_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 239 static void a2dp_source_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t * event, uint16_t event_size); 240 static void avrcp_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 241 static void avrcp_target_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 242 static void avrcp_controller_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 243 #ifdef HAVE_BTSTACK_STDIN 244 static void stdin_process(char cmd); 245 #endif 246 247 static void a2dp_demo_hexcmod_configure_sample_rate(int sample_rate); 248 249 static int a2dp_source_and_avrcp_services_init(void){ 250 251 // Request role change on reconnecting headset to always use them in slave mode 252 hci_set_master_slave_policy(0); 253 // enabled EIR 254 hci_set_inquiry_mode(INQUIRY_MODE_RSSI_AND_EIR); 255 256 l2cap_init(); 257 258 #ifdef ENABLE_BLE 259 // Initialize LE Security Manager. Needed for cross-transport key derivation 260 sm_init(); 261 #endif 262 263 // Initialize A2DP Source 264 a2dp_source_init(); 265 a2dp_source_register_packet_handler(&a2dp_source_packet_handler); 266 267 // Create stream endpoint 268 avdtp_stream_endpoint_t * local_stream_endpoint = a2dp_source_create_stream_endpoint(AVDTP_AUDIO, AVDTP_CODEC_SBC, media_sbc_codec_capabilities, sizeof(media_sbc_codec_capabilities), media_sbc_codec_configuration, sizeof(media_sbc_codec_configuration)); 269 if (!local_stream_endpoint){ 270 printf("A2DP Source: not enough memory to create local stream endpoint\n"); 271 return 1; 272 } 273 274 avdtp_set_preferred_sampling_frequency(local_stream_endpoint, A2DP_SOURCE_DEMO_PREFERRED_SAMPLING_RATE); 275 276 // Store stream enpoint's SEP ID, as it is used by A2DP API to indentify the stream endpoint 277 media_tracker.local_seid = avdtp_local_seid(local_stream_endpoint); 278 avdtp_source_register_delay_reporting_category(media_tracker.local_seid); 279 280 // Initialize AVRCP Service 281 avrcp_init(); 282 avrcp_register_packet_handler(&avrcp_packet_handler); 283 // Initialize AVRCP Target 284 avrcp_target_init(); 285 avrcp_target_register_packet_handler(&avrcp_target_packet_handler); 286 287 // Initialize AVRCP Controller 288 avrcp_controller_init(); 289 avrcp_controller_register_packet_handler(&avrcp_controller_packet_handler); 290 291 // Initialize SDP, 292 sdp_init(); 293 294 // Create A2DP Source service record and register it with SDP 295 memset(sdp_a2dp_source_service_buffer, 0, sizeof(sdp_a2dp_source_service_buffer)); 296 a2dp_source_create_sdp_record(sdp_a2dp_source_service_buffer, sdp_create_service_record_handle(), AVDTP_SOURCE_FEATURE_MASK_PLAYER, NULL, NULL); 297 btstack_assert(de_get_len( sdp_a2dp_source_service_buffer) <= sizeof(sdp_a2dp_source_service_buffer)); 298 sdp_register_service(sdp_a2dp_source_service_buffer); 299 300 // Create AVRCP Target service record and register it with SDP. We receive Category 1 commands from the headphone, e.g. play/pause 301 memset(sdp_avrcp_target_service_buffer, 0, sizeof(sdp_avrcp_target_service_buffer)); 302 uint16_t supported_features = AVRCP_FEATURE_MASK_CATEGORY_PLAYER_OR_RECORDER; 303 #ifdef AVRCP_BROWSING_ENABLED 304 supported_features |= AVRCP_FEATURE_MASK_BROWSING; 305 #endif 306 avrcp_target_create_sdp_record(sdp_avrcp_target_service_buffer, sdp_create_service_record_handle(), supported_features, NULL, NULL); 307 btstack_assert(de_get_len( sdp_avrcp_target_service_buffer) <= sizeof(sdp_avrcp_target_service_buffer)); 308 sdp_register_service(sdp_avrcp_target_service_buffer); 309 310 // Create AVRCP Controller service record and register it with SDP. We send Category 2 commands to the headphone, e.g. volume up/down 311 memset(sdp_avrcp_controller_service_buffer, 0, sizeof(sdp_avrcp_controller_service_buffer)); 312 uint16_t controller_supported_features = AVRCP_FEATURE_MASK_CATEGORY_MONITOR_OR_AMPLIFIER; 313 avrcp_controller_create_sdp_record(sdp_avrcp_controller_service_buffer, sdp_create_service_record_handle(), controller_supported_features, NULL, NULL); 314 btstack_assert(de_get_len( sdp_avrcp_controller_service_buffer) <= sizeof(sdp_avrcp_controller_service_buffer)); 315 sdp_register_service(sdp_avrcp_controller_service_buffer); 316 317 // Register Device ID (PnP) service SDP record 318 memset(device_id_sdp_service_buffer, 0, sizeof(device_id_sdp_service_buffer)); 319 device_id_create_sdp_record(device_id_sdp_service_buffer, sdp_create_service_record_handle(), DEVICE_ID_VENDOR_ID_SOURCE_BLUETOOTH, BLUETOOTH_COMPANY_ID_BLUEKITCHEN_GMBH, 1, 1); 320 btstack_assert(de_get_len( device_id_sdp_service_buffer) <= sizeof(device_id_sdp_service_buffer)); 321 sdp_register_service(device_id_sdp_service_buffer); 322 323 // Set local name with a template Bluetooth address, that will be automatically 324 // replaced with a actual address once it is available, i.e. when BTstack boots 325 // up and starts talking to a Bluetooth module. 326 gap_set_local_name("A2DP Source 00:00:00:00:00:00"); 327 gap_discoverable_control(1); 328 gap_set_class_of_device(0x200408); 329 330 // Register for HCI events. 331 hci_event_callback_registration.callback = &hci_packet_handler; 332 hci_add_event_handler(&hci_event_callback_registration); 333 334 data_source = STREAM_MOD; 335 336 // Parse human readable Bluetooth address. 337 sscanf_bd_addr(device_addr_string, device_addr); 338 339 #ifdef HAVE_BTSTACK_STDIN 340 btstack_stdin_setup(stdin_process); 341 #endif 342 return 0; 343 } 344 /* LISTING_END */ 345 346 static void a2dp_demo_hexcmod_configure_sample_rate(int sample_rate){ 347 if (!hxcmod_initialized){ 348 hxcmod_initialized = hxcmod_init(&mod_context); 349 if (!hxcmod_initialized) { 350 printf("could not initialize hxcmod\n"); 351 return; 352 } 353 } 354 current_sample_rate = sample_rate; 355 media_tracker.sbc_storage_count = 0; 356 media_tracker.samples_ready = 0; 357 hxcmod_unload(&mod_context); 358 hxcmod_setcfg(&mod_context, current_sample_rate, 16, 1, 1, 1); 359 hxcmod_load(&mod_context, (void *) &mod_data, mod_len); 360 } 361 362 static void a2dp_demo_send_media_packet(void){ 363 int num_bytes_in_frame = sbc_encoder_instance->sbc_buffer_length(&sbc_encoder_state); 364 int bytes_in_storage = media_tracker.sbc_storage_count; 365 uint8_t num_sbc_frames = bytes_in_storage / num_bytes_in_frame; 366 // Prepend SBC Header 367 media_tracker.sbc_storage[0] = num_sbc_frames; // (fragmentation << 7) | (starting_packet << 6) | (last_packet << 5) | num_frames; 368 a2dp_source_stream_send_media_payload_rtp(media_tracker.a2dp_cid, media_tracker.local_seid, 0, 369 media_tracker.rtp_timestamp, 370 media_tracker.sbc_storage, bytes_in_storage + 1); 371 372 // update rtp_timestamp 373 unsigned int num_audio_samples_per_sbc_buffer = sbc_encoder_instance->num_audio_frames(&sbc_encoder_state); 374 media_tracker.rtp_timestamp += num_sbc_frames * num_audio_samples_per_sbc_buffer; 375 376 media_tracker.sbc_storage_count = 0; 377 media_tracker.sbc_ready_to_send = 0; 378 } 379 380 static void produce_sine_audio(int16_t * pcm_buffer, int num_samples_to_write){ 381 int count; 382 for (count = 0; count < num_samples_to_write ; count++){ 383 switch (current_sample_rate){ 384 case 44100: 385 pcm_buffer[count * 2] = sine_int16_44100[sine_phase]; 386 pcm_buffer[count * 2 + 1] = sine_int16_44100[sine_phase]; 387 sine_phase++; 388 if (sine_phase >= num_samples_sine_int16_44100){ 389 sine_phase -= num_samples_sine_int16_44100; 390 } 391 break; 392 case 48000: 393 pcm_buffer[count * 2] = sine_int16_48000[sine_phase]; 394 pcm_buffer[count * 2 + 1] = sine_int16_48000[sine_phase]; 395 sine_phase++; 396 if (sine_phase >= num_samples_sine_int16_48000){ 397 sine_phase -= num_samples_sine_int16_48000; 398 } 399 break; 400 default: 401 break; 402 } 403 } 404 } 405 406 static void produce_mod_audio(int16_t * pcm_buffer, int num_samples_to_write){ 407 hxcmod_fillbuffer(&mod_context, (unsigned short *) &pcm_buffer[0], num_samples_to_write, &trkbuf); 408 } 409 410 static void produce_audio(int16_t * pcm_buffer, int num_samples){ 411 switch (data_source){ 412 case STREAM_SINE: 413 produce_sine_audio(pcm_buffer, num_samples); 414 break; 415 case STREAM_MOD: 416 produce_mod_audio(pcm_buffer, num_samples); 417 break; 418 default: 419 break; 420 } 421 #ifdef VOLUME_REDUCTION 422 int i; 423 for (i=0;i<num_samples*2;i++){ 424 if (pcm_buffer[i] > 0){ 425 pcm_buffer[i] = pcm_buffer[i] >> VOLUME_REDUCTION; 426 } else { 427 pcm_buffer[i] = -((-pcm_buffer[i]) >> VOLUME_REDUCTION); 428 } 429 } 430 #endif 431 } 432 433 static int a2dp_demo_fill_sbc_audio_buffer(a2dp_media_sending_context_t * context){ 434 // perform sbc encoding 435 int total_num_bytes_read = 0; 436 unsigned int num_audio_samples_per_sbc_buffer = sbc_encoder_instance->num_audio_frames(&sbc_encoder_state); 437 uint16_t sbc_buffer_length = sbc_encoder_instance->sbc_buffer_length(&sbc_encoder_state); 438 while (context->samples_ready >= num_audio_samples_per_sbc_buffer 439 && (context->max_media_payload_size - context->sbc_storage_count) >= sbc_buffer_length){ 440 441 int16_t pcm_frame[256*NUM_CHANNELS]; 442 443 produce_audio(pcm_frame, num_audio_samples_per_sbc_buffer); 444 445 // encode into sbc storage buffer, first byte contains sbc media header 446 sbc_encoder_instance->encode_signed_16(&sbc_encoder_state, pcm_frame, &context->sbc_storage[1 + context->sbc_storage_count]); 447 448 total_num_bytes_read += num_audio_samples_per_sbc_buffer; 449 450 uint16_t sbc_frame_size = sbc_encoder_instance->sbc_buffer_length(&sbc_encoder_state); 451 context->sbc_storage_count += sbc_frame_size; 452 context->samples_ready -= num_audio_samples_per_sbc_buffer; 453 } 454 return total_num_bytes_read; 455 } 456 457 static void a2dp_demo_audio_timeout_handler(btstack_timer_source_t * timer){ 458 a2dp_media_sending_context_t * context = (a2dp_media_sending_context_t *) btstack_run_loop_get_timer_context(timer); 459 btstack_run_loop_set_timer(&context->audio_timer, AUDIO_TIMEOUT_MS); 460 btstack_run_loop_add_timer(&context->audio_timer); 461 uint32_t now = btstack_run_loop_get_time_ms(); 462 463 uint32_t update_period_ms = AUDIO_TIMEOUT_MS; 464 if (context->time_audio_data_sent > 0){ 465 update_period_ms = now - context->time_audio_data_sent; 466 } 467 468 uint32_t num_samples = (update_period_ms * current_sample_rate) / 1000; 469 context->acc_num_missed_samples += (update_period_ms * current_sample_rate) % 1000; 470 471 while (context->acc_num_missed_samples >= 1000){ 472 num_samples++; 473 context->acc_num_missed_samples -= 1000; 474 } 475 context->time_audio_data_sent = now; 476 context->samples_ready += num_samples; 477 478 if (context->sbc_ready_to_send) return; 479 480 a2dp_demo_fill_sbc_audio_buffer(context); 481 482 if ((context->sbc_storage_count + sbc_encoder_instance->sbc_buffer_length(&sbc_encoder_state)) > context->max_media_payload_size){ 483 // schedule sending 484 context->sbc_ready_to_send = 1; 485 a2dp_source_stream_endpoint_request_can_send_now(context->a2dp_cid, context->local_seid); 486 } 487 } 488 489 static void a2dp_demo_timer_start(a2dp_media_sending_context_t * context){ 490 context->max_media_payload_size = btstack_min(a2dp_max_media_payload_size(context->a2dp_cid, context->local_seid), SBC_STORAGE_SIZE); 491 context->sbc_storage_count = 0; 492 context->sbc_ready_to_send = 0; 493 context->streaming = 1; 494 btstack_run_loop_remove_timer(&context->audio_timer); 495 btstack_run_loop_set_timer_handler(&context->audio_timer, a2dp_demo_audio_timeout_handler); 496 btstack_run_loop_set_timer_context(&context->audio_timer, context); 497 btstack_run_loop_set_timer(&context->audio_timer, AUDIO_TIMEOUT_MS); 498 btstack_run_loop_add_timer(&context->audio_timer); 499 } 500 501 static void a2dp_demo_timer_stop(a2dp_media_sending_context_t * context){ 502 context->time_audio_data_sent = 0; 503 context->acc_num_missed_samples = 0; 504 context->samples_ready = 0; 505 context->streaming = 1; 506 context->sbc_storage_count = 0; 507 context->sbc_ready_to_send = 0; 508 btstack_run_loop_remove_timer(&context->audio_timer); 509 } 510 511 static void dump_sbc_configuration(media_codec_configuration_sbc_t * configuration){ 512 printf("Received media codec configuration:\n"); 513 printf(" - num_channels: %d\n", configuration->num_channels); 514 printf(" - sampling_frequency: %d\n", configuration->sampling_frequency); 515 printf(" - channel_mode: %d\n", configuration->channel_mode); 516 printf(" - block_length: %d\n", configuration->block_length); 517 printf(" - subbands: %d\n", configuration->subbands); 518 printf(" - allocation_method: %d\n", configuration->allocation_method); 519 printf(" - bitpool_value [%d, %d] \n", configuration->min_bitpool_value, configuration->max_bitpool_value); 520 } 521 522 static void a2dp_source_demo_start_scanning(void){ 523 printf("Start scanning...\n"); 524 gap_inquiry_start(A2DP_SOURCE_DEMO_INQUIRY_DURATION_1280MS); 525 scan_active = true; 526 } 527 528 static void hci_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 529 UNUSED(channel); 530 UNUSED(size); 531 if (packet_type != HCI_EVENT_PACKET) return; 532 uint8_t status; 533 UNUSED(status); 534 535 bd_addr_t address; 536 uint32_t cod; 537 538 // Service Class: Rendering | Audio, Major Device Class: Audio 539 const uint32_t bluetooth_speaker_cod = 0x200000 | 0x040000 | 0x000400; 540 541 switch (hci_event_packet_get_type(packet)){ 542 #ifndef HAVE_BTSTACK_STDIN 543 case BTSTACK_EVENT_STATE: 544 if (btstack_event_state_get_state(packet) != HCI_STATE_WORKING) return; 545 a2dp_source_demo_start_scanning(); 546 break; 547 #endif 548 case HCI_EVENT_PIN_CODE_REQUEST: 549 printf("Pin code request - using '0000'\n"); 550 hci_event_pin_code_request_get_bd_addr(packet, address); 551 gap_pin_code_response(address, "0000"); 552 break; 553 case GAP_EVENT_INQUIRY_RESULT: 554 gap_event_inquiry_result_get_bd_addr(packet, address); 555 // print info 556 printf("Device found: %s ", bd_addr_to_str(address)); 557 cod = gap_event_inquiry_result_get_class_of_device(packet); 558 printf("with COD: %06" PRIx32, cod); 559 if (gap_event_inquiry_result_get_rssi_available(packet)){ 560 printf(", rssi %d dBm", (int8_t) gap_event_inquiry_result_get_rssi(packet)); 561 } 562 if (gap_event_inquiry_result_get_name_available(packet)){ 563 char name_buffer[240]; 564 int name_len = gap_event_inquiry_result_get_name_len(packet); 565 memcpy(name_buffer, gap_event_inquiry_result_get_name(packet), name_len); 566 name_buffer[name_len] = 0; 567 printf(", name '%s'", name_buffer); 568 } 569 printf("\n"); 570 if ((cod & bluetooth_speaker_cod) == bluetooth_speaker_cod){ 571 memcpy(device_addr, address, 6); 572 printf("Bluetooth speaker detected, trying to connect to %s...\n", bd_addr_to_str(device_addr)); 573 scan_active = false; 574 gap_inquiry_stop(); 575 a2dp_source_establish_stream(device_addr, &media_tracker.a2dp_cid); 576 } 577 break; 578 case GAP_EVENT_INQUIRY_COMPLETE: 579 if (scan_active){ 580 printf("No Bluetooth speakers found, scanning again...\n"); 581 gap_inquiry_start(A2DP_SOURCE_DEMO_INQUIRY_DURATION_1280MS); 582 } 583 break; 584 default: 585 break; 586 } 587 } 588 589 static void a2dp_source_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 590 UNUSED(channel); 591 UNUSED(size); 592 uint8_t status; 593 uint8_t local_seid; 594 bd_addr_t address; 595 uint16_t cid; 596 597 avdtp_channel_mode_t channel_mode; 598 uint8_t allocation_method; 599 600 if (packet_type != HCI_EVENT_PACKET) return; 601 if (hci_event_packet_get_type(packet) != HCI_EVENT_A2DP_META) return; 602 603 switch (hci_event_a2dp_meta_get_subevent_code(packet)){ 604 case A2DP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED: 605 a2dp_subevent_signaling_connection_established_get_bd_addr(packet, address); 606 cid = a2dp_subevent_signaling_connection_established_get_a2dp_cid(packet); 607 status = a2dp_subevent_signaling_connection_established_get_status(packet); 608 609 if (status != ERROR_CODE_SUCCESS){ 610 printf("A2DP Source: Connection failed, status 0x%02x, cid 0x%02x, a2dp_cid 0x%02x \n", status, cid, media_tracker.a2dp_cid); 611 media_tracker.a2dp_cid = 0; 612 break; 613 } 614 media_tracker.a2dp_cid = cid; 615 media_tracker.volume = 32; 616 617 printf("A2DP Source: Connected to address %s, a2dp cid 0x%02x, local seid 0x%02x.\n", bd_addr_to_str(address), media_tracker.a2dp_cid, media_tracker.local_seid); 618 break; 619 620 case A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION: 621 cid = avdtp_subevent_signaling_media_codec_sbc_configuration_get_avdtp_cid(packet); 622 if (cid != media_tracker.a2dp_cid) return; 623 624 media_tracker.remote_seid = a2dp_subevent_signaling_media_codec_sbc_configuration_get_remote_seid(packet); 625 626 sbc_configuration.reconfigure = a2dp_subevent_signaling_media_codec_sbc_configuration_get_reconfigure(packet); 627 sbc_configuration.num_channels = a2dp_subevent_signaling_media_codec_sbc_configuration_get_num_channels(packet); 628 sbc_configuration.sampling_frequency = a2dp_subevent_signaling_media_codec_sbc_configuration_get_sampling_frequency(packet); 629 sbc_configuration.block_length = a2dp_subevent_signaling_media_codec_sbc_configuration_get_block_length(packet); 630 sbc_configuration.subbands = a2dp_subevent_signaling_media_codec_sbc_configuration_get_subbands(packet); 631 sbc_configuration.min_bitpool_value = a2dp_subevent_signaling_media_codec_sbc_configuration_get_min_bitpool_value(packet); 632 sbc_configuration.max_bitpool_value = a2dp_subevent_signaling_media_codec_sbc_configuration_get_max_bitpool_value(packet); 633 634 channel_mode = (avdtp_channel_mode_t) a2dp_subevent_signaling_media_codec_sbc_configuration_get_channel_mode(packet); 635 allocation_method = a2dp_subevent_signaling_media_codec_sbc_configuration_get_allocation_method(packet); 636 637 printf("A2DP Source: Received SBC codec configuration, sampling frequency %u, a2dp_cid 0x%02x, local seid 0x%02x, remote seid 0x%02x.\n", 638 sbc_configuration.sampling_frequency, cid, 639 a2dp_subevent_signaling_media_codec_sbc_configuration_get_local_seid(packet), 640 a2dp_subevent_signaling_media_codec_sbc_configuration_get_remote_seid(packet)); 641 642 // Adapt Bluetooth spec definition to SBC Encoder expected input 643 sbc_configuration.allocation_method = (btstack_sbc_allocation_method_t)(allocation_method - 1); 644 switch (channel_mode){ 645 case AVDTP_CHANNEL_MODE_JOINT_STEREO: 646 sbc_configuration.channel_mode = SBC_CHANNEL_MODE_JOINT_STEREO; 647 break; 648 case AVDTP_CHANNEL_MODE_STEREO: 649 sbc_configuration.channel_mode = SBC_CHANNEL_MODE_STEREO; 650 break; 651 case AVDTP_CHANNEL_MODE_DUAL_CHANNEL: 652 sbc_configuration.channel_mode = SBC_CHANNEL_MODE_DUAL_CHANNEL; 653 break; 654 case AVDTP_CHANNEL_MODE_MONO: 655 sbc_configuration.channel_mode = SBC_CHANNEL_MODE_MONO; 656 break; 657 default: 658 btstack_assert(false); 659 break; 660 } 661 dump_sbc_configuration(&sbc_configuration); 662 663 current_sample_rate = sbc_configuration.sampling_frequency; 664 a2dp_demo_hexcmod_configure_sample_rate(current_sample_rate); 665 666 sbc_encoder_instance = btstack_sbc_encoder_bluedroid_init_instance(&sbc_encoder_state); 667 sbc_encoder_instance->configure(&sbc_encoder_state, SBC_MODE_STANDARD, 668 sbc_configuration.block_length, sbc_configuration.subbands, 669 sbc_configuration.allocation_method, sbc_configuration.sampling_frequency, 670 sbc_configuration.max_bitpool_value, 671 sbc_configuration.channel_mode); 672 break; 673 674 case A2DP_SUBEVENT_SIGNALING_DELAY_REPORTING_CAPABILITY: 675 printf("A2DP Source: remote supports delay report, remote seid %d\n", 676 avdtp_subevent_signaling_delay_reporting_capability_get_remote_seid(packet)); 677 break; 678 case A2DP_SUBEVENT_SIGNALING_CAPABILITIES_DONE: 679 printf("A2DP Source: All capabilities reported, remote seid %d\n", 680 avdtp_subevent_signaling_capabilities_done_get_remote_seid(packet)); 681 break; 682 683 case A2DP_SUBEVENT_SIGNALING_DELAY_REPORT: 684 printf("A2DP Source: Received delay report of %d.%0d ms, local seid %d\n", 685 avdtp_subevent_signaling_delay_report_get_delay_100us(packet)/10, avdtp_subevent_signaling_delay_report_get_delay_100us(packet)%10, 686 avdtp_subevent_signaling_delay_report_get_local_seid(packet)); 687 break; 688 689 case A2DP_SUBEVENT_STREAM_ESTABLISHED: 690 a2dp_subevent_stream_established_get_bd_addr(packet, address); 691 status = a2dp_subevent_stream_established_get_status(packet); 692 if (status != ERROR_CODE_SUCCESS){ 693 printf("A2DP Source: Stream failed, status 0x%02x.\n", status); 694 break; 695 } 696 697 local_seid = a2dp_subevent_stream_established_get_local_seid(packet); 698 cid = a2dp_subevent_stream_established_get_a2dp_cid(packet); 699 700 printf("A2DP Source: Stream established a2dp_cid 0x%02x, local_seid 0x%02x, remote_seid 0x%02x\n", cid, local_seid, a2dp_subevent_stream_established_get_remote_seid(packet)); 701 702 a2dp_demo_hexcmod_configure_sample_rate(current_sample_rate); 703 media_tracker.stream_opened = 1; 704 status = a2dp_source_start_stream(media_tracker.a2dp_cid, media_tracker.local_seid); 705 break; 706 707 case A2DP_SUBEVENT_STREAM_RECONFIGURED: 708 status = a2dp_subevent_stream_reconfigured_get_status(packet); 709 local_seid = a2dp_subevent_stream_reconfigured_get_local_seid(packet); 710 cid = a2dp_subevent_stream_reconfigured_get_a2dp_cid(packet); 711 712 if (status != ERROR_CODE_SUCCESS){ 713 printf("A2DP Source: Stream reconfiguration failed, status 0x%02x\n", status); 714 break; 715 } 716 717 printf("A2DP Source: Stream reconfigured a2dp_cid 0x%02x, local_seid 0x%02x\n", cid, local_seid); 718 a2dp_demo_hexcmod_configure_sample_rate(new_sample_rate); 719 status = a2dp_source_start_stream(media_tracker.a2dp_cid, media_tracker.local_seid); 720 break; 721 722 case A2DP_SUBEVENT_STREAM_STARTED: 723 local_seid = a2dp_subevent_stream_started_get_local_seid(packet); 724 cid = a2dp_subevent_stream_started_get_a2dp_cid(packet); 725 726 play_info.status = AVRCP_PLAYBACK_STATUS_PLAYING; 727 if (media_tracker.avrcp_cid){ 728 avrcp_target_set_now_playing_info(media_tracker.avrcp_cid, &tracks[data_source], sizeof(tracks)/sizeof(avrcp_track_t)); 729 avrcp_target_set_playback_status(media_tracker.avrcp_cid, AVRCP_PLAYBACK_STATUS_PLAYING); 730 } 731 a2dp_demo_timer_start(&media_tracker); 732 printf("A2DP Source: Stream started, a2dp_cid 0x%02x, local_seid 0x%02x\n", cid, local_seid); 733 break; 734 735 case A2DP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW: 736 local_seid = a2dp_subevent_streaming_can_send_media_packet_now_get_local_seid(packet); 737 cid = a2dp_subevent_signaling_media_codec_sbc_configuration_get_a2dp_cid(packet); 738 a2dp_demo_send_media_packet(); 739 break; 740 741 case A2DP_SUBEVENT_STREAM_SUSPENDED: 742 local_seid = a2dp_subevent_stream_suspended_get_local_seid(packet); 743 cid = a2dp_subevent_stream_suspended_get_a2dp_cid(packet); 744 745 play_info.status = AVRCP_PLAYBACK_STATUS_PAUSED; 746 if (media_tracker.avrcp_cid){ 747 avrcp_target_set_playback_status(media_tracker.avrcp_cid, AVRCP_PLAYBACK_STATUS_PAUSED); 748 } 749 printf("A2DP Source: Stream paused, a2dp_cid 0x%02x, local_seid 0x%02x\n", cid, local_seid); 750 751 a2dp_demo_timer_stop(&media_tracker); 752 break; 753 754 case A2DP_SUBEVENT_STREAM_RELEASED: 755 play_info.status = AVRCP_PLAYBACK_STATUS_STOPPED; 756 cid = a2dp_subevent_stream_released_get_a2dp_cid(packet); 757 local_seid = a2dp_subevent_stream_released_get_local_seid(packet); 758 759 printf("A2DP Source: Stream released, a2dp_cid 0x%02x, local_seid 0x%02x\n", cid, local_seid); 760 761 if (cid == media_tracker.a2dp_cid) { 762 media_tracker.stream_opened = 0; 763 printf("A2DP Source: Stream released.\n"); 764 } 765 if (media_tracker.avrcp_cid){ 766 avrcp_target_set_now_playing_info(media_tracker.avrcp_cid, NULL, sizeof(tracks)/sizeof(avrcp_track_t)); 767 avrcp_target_set_playback_status(media_tracker.avrcp_cid, AVRCP_PLAYBACK_STATUS_STOPPED); 768 } 769 a2dp_demo_timer_stop(&media_tracker); 770 break; 771 case A2DP_SUBEVENT_SIGNALING_CONNECTION_RELEASED: 772 cid = a2dp_subevent_signaling_connection_released_get_a2dp_cid(packet); 773 if (cid == media_tracker.a2dp_cid) { 774 media_tracker.avrcp_cid = 0; 775 media_tracker.a2dp_cid = 0; 776 printf("A2DP Source: Signaling released.\n\n"); 777 } 778 break; 779 default: 780 break; 781 } 782 } 783 784 static void avrcp_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 785 UNUSED(channel); 786 UNUSED(size); 787 bd_addr_t event_addr; 788 uint16_t local_cid; 789 uint8_t status = ERROR_CODE_SUCCESS; 790 791 if (packet_type != HCI_EVENT_PACKET) return; 792 if (hci_event_packet_get_type(packet) != HCI_EVENT_AVRCP_META) return; 793 794 switch (packet[2]){ 795 case AVRCP_SUBEVENT_CONNECTION_ESTABLISHED: 796 local_cid = avrcp_subevent_connection_established_get_avrcp_cid(packet); 797 status = avrcp_subevent_connection_established_get_status(packet); 798 if (status != ERROR_CODE_SUCCESS){ 799 printf("AVRCP: Connection failed, local cid 0x%02x, status 0x%02x\n", local_cid, status); 800 return; 801 } 802 media_tracker.avrcp_cid = local_cid; 803 avrcp_subevent_connection_established_get_bd_addr(packet, event_addr); 804 805 printf("AVRCP: Channel to %s successfully opened, avrcp_cid 0x%02x\n", bd_addr_to_str(event_addr), media_tracker.avrcp_cid); 806 807 avrcp_target_support_event(media_tracker.avrcp_cid, AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED); 808 avrcp_target_support_event(media_tracker.avrcp_cid, AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED); 809 avrcp_target_support_event(media_tracker.avrcp_cid, AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED); 810 avrcp_target_set_now_playing_info(media_tracker.avrcp_cid, NULL, sizeof(tracks)/sizeof(avrcp_track_t)); 811 812 printf("Enable Volume Change notification\n"); 813 avrcp_controller_enable_notification(media_tracker.avrcp_cid, AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED); 814 printf("Enable Battery Status Change notification\n"); 815 avrcp_controller_enable_notification(media_tracker.avrcp_cid, AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED); 816 return; 817 818 case AVRCP_SUBEVENT_CONNECTION_RELEASED: 819 printf("AVRCP Target: Disconnected, avrcp_cid 0x%02x\n", avrcp_subevent_connection_released_get_avrcp_cid(packet)); 820 media_tracker.avrcp_cid = 0; 821 return; 822 default: 823 break; 824 } 825 826 if (status != ERROR_CODE_SUCCESS){ 827 printf("Responding to event 0x%02x failed, status 0x%02x\n", packet[2], status); 828 } 829 } 830 831 static void avrcp_target_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 832 UNUSED(channel); 833 UNUSED(size); 834 uint8_t status = ERROR_CODE_SUCCESS; 835 836 if (packet_type != HCI_EVENT_PACKET) return; 837 if (hci_event_packet_get_type(packet) != HCI_EVENT_AVRCP_META) return; 838 839 bool button_pressed; 840 char const * button_state; 841 avrcp_operation_id_t operation_id; 842 843 switch (packet[2]){ 844 case AVRCP_SUBEVENT_PLAY_STATUS_QUERY: 845 status = avrcp_target_play_status(media_tracker.avrcp_cid, play_info.song_length_ms, play_info.song_position_ms, play_info.status); 846 break; 847 // case AVRCP_SUBEVENT_NOW_PLAYING_INFO_QUERY: 848 // status = avrcp_target_now_playing_info(avrcp_cid); 849 // break; 850 case AVRCP_SUBEVENT_OPERATION: 851 operation_id = (avrcp_operation_id_t) avrcp_subevent_operation_get_operation_id(packet); 852 button_pressed = avrcp_subevent_operation_get_button_pressed(packet) > 0; 853 button_state = button_pressed ? "PRESS" : "RELEASE"; 854 855 printf("AVRCP Target: operation %s (%s)\n", avrcp_operation2str(operation_id), button_state); 856 857 if (!button_pressed){ 858 break; 859 } 860 switch (operation_id) { 861 case AVRCP_OPERATION_ID_PLAY: 862 status = a2dp_source_start_stream(media_tracker.a2dp_cid, media_tracker.local_seid); 863 break; 864 case AVRCP_OPERATION_ID_PAUSE: 865 status = a2dp_source_pause_stream(media_tracker.a2dp_cid, media_tracker.local_seid); 866 break; 867 case AVRCP_OPERATION_ID_STOP: 868 status = a2dp_source_disconnect(media_tracker.a2dp_cid); 869 break; 870 default: 871 break; 872 } 873 break; 874 default: 875 break; 876 } 877 878 if (status != ERROR_CODE_SUCCESS){ 879 printf("Responding to event 0x%02x failed, status 0x%02x\n", packet[2], status); 880 } 881 } 882 883 static void avrcp_controller_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 884 UNUSED(channel); 885 UNUSED(size); 886 887 if (packet_type != HCI_EVENT_PACKET) return; 888 if (hci_event_packet_get_type(packet) != HCI_EVENT_AVRCP_META) return; 889 if (!media_tracker.avrcp_cid) return; 890 891 switch (packet[2]){ 892 case AVRCP_SUBEVENT_NOTIFICATION_VOLUME_CHANGED: 893 printf("AVRCP Controller: Notification Absolute Volume %d %%\n", avrcp_subevent_notification_volume_changed_get_absolute_volume(packet) * 100 / 127); 894 break; 895 case AVRCP_SUBEVENT_NOTIFICATION_EVENT_BATT_STATUS_CHANGED: 896 // see avrcp_battery_status_t 897 printf("AVRCP Controller: Notification Battery Status 0x%02x\n", avrcp_subevent_notification_event_batt_status_changed_get_battery_status(packet)); 898 break; 899 case AVRCP_SUBEVENT_NOTIFICATION_STATE: 900 printf("AVRCP Controller: Notification %s - %s\n", 901 avrcp_event2str(avrcp_subevent_notification_state_get_event_id(packet)), 902 avrcp_subevent_notification_state_get_enabled(packet) != 0 ? "enabled" : "disabled"); 903 break; 904 default: 905 break; 906 } 907 } 908 909 #ifdef HAVE_BTSTACK_STDIN 910 static void show_usage(void){ 911 bd_addr_t iut_address; 912 gap_local_bd_addr(iut_address); 913 printf("\n--- Bluetooth A2DP Source/AVRCP Demo %s ---\n", bd_addr_to_str(iut_address)); 914 printf("a - Scan for Bluetooth speaker and connect\n"); 915 printf("b - A2DP Source create connection to addr %s\n", device_addr_string); 916 printf("B - A2DP Source disconnect\n"); 917 printf("c - AVRCP create connection to addr %s\n", device_addr_string); 918 printf("C - AVRCP disconnect\n"); 919 printf("D - delete all link keys\n"); 920 921 printf("x - start streaming sine\n"); 922 if (hxcmod_initialized){ 923 printf("z - start streaming '%s'\n", mod_name); 924 } 925 printf("p - pause streaming\n"); 926 printf("w - reconfigure stream for 44100 Hz\n"); 927 printf("e - reconfigure stream for 48000 Hz\n"); 928 printf("t - volume up\n"); 929 printf("T - volume down\n"); 930 printf("v - volume up (via set absolute volume)\n"); 931 printf("V - volume down (via set absolute volume)\n"); 932 933 printf("---\n"); 934 } 935 936 static void stdin_process(char cmd){ 937 uint8_t status = ERROR_CODE_SUCCESS; 938 switch (cmd){ 939 case 'a': 940 a2dp_source_demo_start_scanning(); 941 break; 942 case 'b': 943 status = a2dp_source_establish_stream(device_addr, &media_tracker.a2dp_cid); 944 printf("%c - Create A2DP Source connection to addr %s, cid 0x%02x.\n", cmd, bd_addr_to_str(device_addr), media_tracker.a2dp_cid); 945 break; 946 case 'B': 947 printf("%c - A2DP Source Disconnect from cid 0x%2x\n", cmd, media_tracker.a2dp_cid); 948 status = a2dp_source_disconnect(media_tracker.a2dp_cid); 949 break; 950 case 'c': 951 printf("%c - Create AVRCP connection to addr %s.\n", cmd, bd_addr_to_str(device_addr)); 952 status = avrcp_connect(device_addr, &media_tracker.avrcp_cid); 953 break; 954 case 'C': 955 printf("%c - AVRCP disconnect\n", cmd); 956 status = avrcp_disconnect(media_tracker.avrcp_cid); 957 break; 958 case 'D': 959 printf("Deleting all link keys\n"); 960 gap_delete_all_link_keys(); 961 break; 962 case '\n': 963 case '\r': 964 break; 965 966 case 't': 967 printf(" - volume up\n"); 968 status = avrcp_controller_volume_up(media_tracker.avrcp_cid); 969 break; 970 case 'T': 971 printf(" - volume down\n"); 972 status = avrcp_controller_volume_down(media_tracker.avrcp_cid); 973 break; 974 975 case 'v': 976 if (media_tracker.volume > 117){ 977 media_tracker.volume = 127; 978 } else { 979 media_tracker.volume += 10; 980 } 981 printf(" - volume up (via set absolute volume) %d%% (%d)\n", media_tracker.volume * 100 / 127, media_tracker.volume); 982 status = avrcp_controller_set_absolute_volume(media_tracker.avrcp_cid, media_tracker.volume); 983 break; 984 case 'V': 985 if (media_tracker.volume < 10){ 986 media_tracker.volume = 0; 987 } else { 988 media_tracker.volume -= 10; 989 } 990 printf(" - volume down (via set absolute volume) %d%% (%d)\n", media_tracker.volume * 100 / 127, media_tracker.volume); 991 status = avrcp_controller_set_absolute_volume(media_tracker.avrcp_cid, media_tracker.volume); 992 break; 993 994 case 'x': 995 if (media_tracker.avrcp_cid){ 996 avrcp_target_set_now_playing_info(media_tracker.avrcp_cid, &tracks[data_source], sizeof(tracks)/sizeof(avrcp_track_t)); 997 } 998 printf("%c - Play sine.\n", cmd); 999 data_source = STREAM_SINE; 1000 if (!media_tracker.stream_opened) break; 1001 status = a2dp_source_start_stream(media_tracker.a2dp_cid, media_tracker.local_seid); 1002 break; 1003 case 'z': 1004 if (media_tracker.avrcp_cid){ 1005 avrcp_target_set_now_playing_info(media_tracker.avrcp_cid, &tracks[data_source], sizeof(tracks)/sizeof(avrcp_track_t)); 1006 } 1007 printf("%c - Play mod.\n", cmd); 1008 data_source = STREAM_MOD; 1009 if (!media_tracker.stream_opened) break; 1010 status = a2dp_source_start_stream(media_tracker.a2dp_cid, media_tracker.local_seid); 1011 break; 1012 1013 case 'p': 1014 if (!media_tracker.stream_opened) break; 1015 printf("%c - Pause stream.\n", cmd); 1016 status = a2dp_source_pause_stream(media_tracker.a2dp_cid, media_tracker.local_seid); 1017 break; 1018 1019 case 'w': 1020 if (!media_tracker.stream_opened) break; 1021 if (play_info.status == AVRCP_PLAYBACK_STATUS_PLAYING){ 1022 printf("Stream cannot be reconfigured while playing, please pause stream first\n"); 1023 break; 1024 } 1025 new_sample_rate = 44100; 1026 if (current_sample_rate == new_sample_rate){ 1027 printf("%c - Stream already configured for %d Hz.\n", cmd, new_sample_rate); 1028 } else { 1029 printf("%c - Reconfigure for %d Hz.\n", cmd, new_sample_rate); 1030 status = a2dp_source_reconfigure_stream_sampling_frequency(media_tracker.a2dp_cid, new_sample_rate); 1031 } 1032 break; 1033 1034 case 'e': 1035 if (!media_tracker.stream_opened) break; 1036 if (play_info.status == AVRCP_PLAYBACK_STATUS_PLAYING){ 1037 printf("Stream cannot be reconfigured while playing, please pause stream first\n"); 1038 break; 1039 } 1040 new_sample_rate = 48000; 1041 if (current_sample_rate == new_sample_rate){ 1042 printf("%c - Stream already configured for %d Hz.\n", cmd, new_sample_rate); 1043 } else { 1044 printf("%c - Reconfigure for %d Hz.\n", cmd, new_sample_rate); 1045 status = a2dp_source_reconfigure_stream_sampling_frequency(media_tracker.a2dp_cid, new_sample_rate); 1046 } 1047 break; 1048 1049 default: 1050 show_usage(); 1051 return; 1052 } 1053 if (status != ERROR_CODE_SUCCESS){ 1054 printf("Could not perform command \'%c\', status 0x%02x\n", cmd, status); 1055 } 1056 } 1057 #endif 1058 1059 1060 int btstack_main(int argc, const char * argv[]); 1061 int btstack_main(int argc, const char * argv[]){ 1062 (void)argc; 1063 (void)argv; 1064 1065 int err = a2dp_source_and_avrcp_services_init(); 1066 if (err) return err; 1067 // turn on! 1068 hci_power_control(HCI_POWER_ON); 1069 return 0; 1070 } 1071 /* EXAMPLE_END */ 1072