/* * Copyright (C) 2016 BlueKitchen GmbH * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the copyright holders nor the names of * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * 4. Any redistribution, use, or modification is done solely for * personal benefit and not for any commercial purpose or for * monetary gain. * * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Please inquire about commercial licensing options at * contact@bluekitchen-gmbh.com * */ #define BTSTACK_FILE__ "a2dp_source_demo.c" /* * a2dp_source_demo.c */ // ***************************************************************************** /* EXAMPLE_START(a2dp_source_demo): A2DP Source - Stream Audio and Control Volume * * @text This A2DP Source example demonstrates how to send an audio data stream * to a remote A2DP Sink device and how to switch between two audio data sources. * In addition, the AVRCP Target is used to answer queries on currently played media, * as well as to handle remote playback control, i.e. play, stop, repeat, etc. If HAVE_BTSTACK_STDIN * is set, press SPACE on the console to show the available AVDTP and AVRCP commands. * * @text To test with a remote device, e.g. a Bluetooth speaker, * set the device_addr_string to the Bluetooth address of your * remote device in the code, and use the UI to connect and start playback. * * @text For more info on BTstack audio, see our blog post * [A2DP Sink and Source on STM32 F4 Discovery Board](http://bluekitchen-gmbh.com/a2dp-sink-and-source-on-stm32-f4-discovery-board/). * */ // ***************************************************************************** #include #include #include #include #include "btstack.h" #include "hxcmod.h" #include "mods/mod.h" // logarithmic volume reduction, samples are divided by 2^x // #define VOLUME_REDUCTION 3 //#define AVRCP_BROWSING_ENABLED // select preferred audio sampling rate: 44100 or 48000 #define A2DP_SOURCE_DEMO_PREFERRED_SAMPLING_RATE 44100 #define NUM_CHANNELS 2 #define BYTES_PER_AUDIO_SAMPLE (2*NUM_CHANNELS) #define AUDIO_TIMEOUT_MS 10 #define TABLE_SIZE_441HZ 100 #define SBC_STORAGE_SIZE 1030 typedef enum { STREAM_SINE = 0, STREAM_MOD, STREAM_PTS_TEST } stream_data_source_t; typedef struct { uint16_t a2dp_cid; uint8_t local_seid; uint8_t remote_seid; uint8_t stream_opened; uint16_t avrcp_cid; uint32_t time_audio_data_sent; // ms uint32_t acc_num_missed_samples; uint32_t samples_ready; btstack_timer_source_t audio_timer; uint8_t streaming; int max_media_payload_size; uint32_t rtp_timestamp; uint8_t sbc_storage[SBC_STORAGE_SIZE]; uint16_t sbc_storage_count; uint8_t sbc_ready_to_send; uint8_t volume; } a2dp_media_sending_context_t; static uint8_t media_sbc_codec_capabilities[] = { (AVDTP_SBC_44100 << 4) | (AVDTP_SBC_48000 << 4) | AVDTP_SBC_STEREO, 0xFF,//(AVDTP_SBC_BLOCK_LENGTH_16 << 4) | (AVDTP_SBC_SUBBANDS_8 << 2) | AVDTP_SBC_ALLOCATION_METHOD_LOUDNESS, 2, 53 }; // input signal: pre-computed int16 sine wave, 44100 Hz at 441 Hz static const int16_t sine_int16_44100[] = { 0, 2057, 4107, 6140, 8149, 10126, 12062, 13952, 15786, 17557, 19260, 20886, 22431, 23886, 25247, 26509, 27666, 28714, 29648, 30466, 31163, 31738, 32187, 32509, 32702, 32767, 32702, 32509, 32187, 31738, 31163, 30466, 29648, 28714, 27666, 26509, 25247, 23886, 22431, 20886, 19260, 17557, 15786, 13952, 12062, 10126, 8149, 6140, 4107, 2057, 0, -2057, -4107, -6140, -8149, -10126, -12062, -13952, -15786, -17557, -19260, -20886, -22431, -23886, -25247, -26509, -27666, -28714, -29648, -30466, -31163, -31738, -32187, -32509, -32702, -32767, -32702, -32509, -32187, -31738, -31163, -30466, -29648, -28714, -27666, -26509, -25247, -23886, -22431, -20886, -19260, -17557, -15786, -13952, -12062, -10126, -8149, -6140, -4107, -2057, }; static const int num_samples_sine_int16_44100 = sizeof(sine_int16_44100) / 2; // input signal: pre-computed int16 sine wave, 48000 Hz at 441 Hz static const int16_t sine_int16_48000[] = { 0, 1905, 3804, 5690, 7557, 9398, 11207, 12978, 14706, 16383, 18006, 19567, 21062, 22486, 23834, 25101, 26283, 27376, 28377, 29282, 30087, 30791, 31390, 31884, 32269, 32545, 32712, 32767, 32712, 32545, 32269, 31884, 31390, 30791, 30087, 29282, 28377, 27376, 26283, 25101, 23834, 22486, 21062, 19567, 18006, 16383, 14706, 12978, 11207, 9398, 7557, 5690, 3804, 1905, 0, -1905, -3804, -5690, -7557, -9398, -11207, -12978, -14706, -16384, -18006, -19567, -21062, -22486, -23834, -25101, -26283, -27376, -28377, -29282, -30087, -30791, -31390, -31884, -32269, -32545, -32712, -32767, -32712, -32545, -32269, -31884, -31390, -30791, -30087, -29282, -28377, -27376, -26283, -25101, -23834, -22486, -21062, -19567, -18006, -16384, -14706, -12978, -11207, -9398, -7557, -5690, -3804, -1905, }; static const int num_samples_sine_int16_48000 = sizeof(sine_int16_48000) / 2; static const int A2DP_SOURCE_DEMO_INQUIRY_DURATION_1280MS = 12; typedef struct { int reconfigure; int num_channels; int sampling_frequency; int block_length; int subbands; int min_bitpool_value; int max_bitpool_value; btstack_sbc_channel_mode_t channel_mode; btstack_sbc_allocation_method_t allocation_method; } media_codec_configuration_sbc_t; static btstack_packet_callback_registration_t hci_event_callback_registration; // Minijambox: static const char * device_addr_string = "00:21:3C:AC:F7:38"; static bd_addr_t device_addr; static bool scan_active; static uint8_t sdp_a2dp_source_service_buffer[150]; static uint8_t sdp_avrcp_target_service_buffer[200]; static uint8_t sdp_avrcp_controller_service_buffer[200]; static uint8_t device_id_sdp_service_buffer[100]; static media_codec_configuration_sbc_t sbc_configuration; static const btstack_sbc_encoder_t * sbc_encoder_instance; static btstack_sbc_encoder_bluedroid_t sbc_encoder_state; static uint8_t media_sbc_codec_configuration[4]; static a2dp_media_sending_context_t media_tracker; static stream_data_source_t data_source; static int sine_phase; static int current_sample_rate = 44100; static int new_sample_rate = 44100; static int hxcmod_initialized; static modcontext mod_context; static tracker_buffer_state trkbuf; /* AVRCP Target context START */ typedef struct { uint8_t track_id[8]; uint32_t song_length_ms; avrcp_playback_status_t status; uint32_t song_position_ms; // 0xFFFFFFFF if not supported } avrcp_play_status_info_t; // python -c "print('a'*512)" static const char title[] = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"; avrcp_track_t tracks[] = { {{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}, 1, "Sine", "Generated", "A2DP Source Demo", "monotone", 12345}, {{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}, 2, "Nao-deceased", "Decease", "A2DP Source Demo", "vivid", 12345}, {{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03}, 3, (char *)title, "Decease", "A2DP Source Demo", "vivid", 12345}, }; int current_track_index; avrcp_play_status_info_t play_info; /* AVRCP Target context END */ /* @section Main Application Setup * * @text The Listing MainConfiguration shows how to setup AD2P Source and AVRCP services. * Besides calling init() method for each service, you'll also need to register several packet handlers: * - hci_packet_handler - handles legacy pairing, here by using fixed '0000' pin code. * - 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). * - avrcp_packet_handler - receives connect/disconnect event. * - avrcp_controller_packet_handler - receives answers for sent AVRCP commands. * - avrcp_target_packet_handler - receives AVRCP commands, and registered notifications. * - 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. * * @text To announce A2DP Source and AVRCP services, you need to create corresponding * SDP records and register them with the SDP service. */ /* LISTING_START(MainConfiguration): Setup Audio Source and AVRCP Target services */ static void hci_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); static void a2dp_source_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t * event, uint16_t event_size); static void avrcp_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); static void avrcp_target_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); static void avrcp_controller_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); #ifdef HAVE_BTSTACK_STDIN static void stdin_process(char cmd); #endif static void a2dp_demo_hexcmod_configure_sample_rate(int sample_rate); static int a2dp_source_and_avrcp_services_init(void){ // Request role change on reconnecting headset to always use them in slave mode hci_set_master_slave_policy(0); // enabled EIR hci_set_inquiry_mode(INQUIRY_MODE_RSSI_AND_EIR); l2cap_init(); #ifdef ENABLE_BLE // Initialize LE Security Manager. Needed for cross-transport key derivation sm_init(); #endif // Initialize A2DP Source a2dp_source_init(); a2dp_source_register_packet_handler(&a2dp_source_packet_handler); // Create stream endpoint 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)); if (!local_stream_endpoint){ printf("A2DP Source: not enough memory to create local stream endpoint\n"); return 1; } avdtp_set_preferred_sampling_frequency(local_stream_endpoint, A2DP_SOURCE_DEMO_PREFERRED_SAMPLING_RATE); // Store stream enpoint's SEP ID, as it is used by A2DP API to indentify the stream endpoint media_tracker.local_seid = avdtp_local_seid(local_stream_endpoint); avdtp_source_register_delay_reporting_category(media_tracker.local_seid); // Initialize AVRCP Service avrcp_init(); avrcp_register_packet_handler(&avrcp_packet_handler); // Initialize AVRCP Target avrcp_target_init(); avrcp_target_register_packet_handler(&avrcp_target_packet_handler); // Initialize AVRCP Controller avrcp_controller_init(); avrcp_controller_register_packet_handler(&avrcp_controller_packet_handler); // Initialize SDP, sdp_init(); // Create A2DP Source service record and register it with SDP memset(sdp_a2dp_source_service_buffer, 0, sizeof(sdp_a2dp_source_service_buffer)); a2dp_source_create_sdp_record(sdp_a2dp_source_service_buffer, sdp_create_service_record_handle(), AVDTP_SOURCE_FEATURE_MASK_PLAYER, NULL, NULL); btstack_assert(de_get_len( sdp_a2dp_source_service_buffer) <= sizeof(sdp_a2dp_source_service_buffer)); sdp_register_service(sdp_a2dp_source_service_buffer); // Create AVRCP Target service record and register it with SDP. We receive Category 1 commands from the headphone, e.g. play/pause memset(sdp_avrcp_target_service_buffer, 0, sizeof(sdp_avrcp_target_service_buffer)); uint16_t supported_features = AVRCP_FEATURE_MASK_CATEGORY_PLAYER_OR_RECORDER; #ifdef AVRCP_BROWSING_ENABLED supported_features |= AVRCP_FEATURE_MASK_BROWSING; #endif avrcp_target_create_sdp_record(sdp_avrcp_target_service_buffer, sdp_create_service_record_handle(), supported_features, NULL, NULL); btstack_assert(de_get_len( sdp_avrcp_target_service_buffer) <= sizeof(sdp_avrcp_target_service_buffer)); sdp_register_service(sdp_avrcp_target_service_buffer); // Create AVRCP Controller service record and register it with SDP. We send Category 2 commands to the headphone, e.g. volume up/down memset(sdp_avrcp_controller_service_buffer, 0, sizeof(sdp_avrcp_controller_service_buffer)); uint16_t controller_supported_features = AVRCP_FEATURE_MASK_CATEGORY_MONITOR_OR_AMPLIFIER; avrcp_controller_create_sdp_record(sdp_avrcp_controller_service_buffer, sdp_create_service_record_handle(), controller_supported_features, NULL, NULL); btstack_assert(de_get_len( sdp_avrcp_controller_service_buffer) <= sizeof(sdp_avrcp_controller_service_buffer)); sdp_register_service(sdp_avrcp_controller_service_buffer); // Register Device ID (PnP) service SDP record memset(device_id_sdp_service_buffer, 0, sizeof(device_id_sdp_service_buffer)); 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); btstack_assert(de_get_len( device_id_sdp_service_buffer) <= sizeof(device_id_sdp_service_buffer)); sdp_register_service(device_id_sdp_service_buffer); // Set local name with a template Bluetooth address, that will be automatically // replaced with a actual address once it is available, i.e. when BTstack boots // up and starts talking to a Bluetooth module. gap_set_local_name("A2DP Source 00:00:00:00:00:00"); gap_discoverable_control(1); gap_set_class_of_device(0x200408); // Register for HCI events. hci_event_callback_registration.callback = &hci_packet_handler; hci_add_event_handler(&hci_event_callback_registration); data_source = STREAM_MOD; // Parse human readable Bluetooth address. sscanf_bd_addr(device_addr_string, device_addr); #ifdef HAVE_BTSTACK_STDIN btstack_stdin_setup(stdin_process); #endif return 0; } /* LISTING_END */ static void a2dp_demo_hexcmod_configure_sample_rate(int sample_rate){ if (!hxcmod_initialized){ hxcmod_initialized = hxcmod_init(&mod_context); if (!hxcmod_initialized) { printf("could not initialize hxcmod\n"); return; } } current_sample_rate = sample_rate; media_tracker.sbc_storage_count = 0; media_tracker.samples_ready = 0; hxcmod_unload(&mod_context); hxcmod_setcfg(&mod_context, current_sample_rate, 16, 1, 1, 1); hxcmod_load(&mod_context, (void *) &mod_data, mod_len); } static void a2dp_demo_send_media_packet(void){ int num_bytes_in_frame = sbc_encoder_instance->sbc_buffer_length(&sbc_encoder_state); int bytes_in_storage = media_tracker.sbc_storage_count; uint8_t num_sbc_frames = bytes_in_storage / num_bytes_in_frame; // Prepend SBC Header media_tracker.sbc_storage[0] = num_sbc_frames; // (fragmentation << 7) | (starting_packet << 6) | (last_packet << 5) | num_frames; a2dp_source_stream_send_media_payload_rtp(media_tracker.a2dp_cid, media_tracker.local_seid, 0, media_tracker.rtp_timestamp, media_tracker.sbc_storage, bytes_in_storage + 1); // update rtp_timestamp unsigned int num_audio_samples_per_sbc_buffer = sbc_encoder_instance->num_audio_frames(&sbc_encoder_state); media_tracker.rtp_timestamp += num_sbc_frames * num_audio_samples_per_sbc_buffer; media_tracker.sbc_storage_count = 0; media_tracker.sbc_ready_to_send = 0; } static void produce_sine_audio(int16_t * pcm_buffer, int num_samples_to_write){ int count; for (count = 0; count < num_samples_to_write ; count++){ switch (current_sample_rate){ case 44100: pcm_buffer[count * 2] = sine_int16_44100[sine_phase]; pcm_buffer[count * 2 + 1] = sine_int16_44100[sine_phase]; sine_phase++; if (sine_phase >= num_samples_sine_int16_44100){ sine_phase -= num_samples_sine_int16_44100; } break; case 48000: pcm_buffer[count * 2] = sine_int16_48000[sine_phase]; pcm_buffer[count * 2 + 1] = sine_int16_48000[sine_phase]; sine_phase++; if (sine_phase >= num_samples_sine_int16_48000){ sine_phase -= num_samples_sine_int16_48000; } break; default: break; } } } static void produce_mod_audio(int16_t * pcm_buffer, int num_samples_to_write){ hxcmod_fillbuffer(&mod_context, (unsigned short *) &pcm_buffer[0], num_samples_to_write, &trkbuf); } static void produce_audio(int16_t * pcm_buffer, int num_samples){ switch (data_source){ case STREAM_SINE: produce_sine_audio(pcm_buffer, num_samples); break; case STREAM_MOD: produce_mod_audio(pcm_buffer, num_samples); break; default: break; } #ifdef VOLUME_REDUCTION int i; for (i=0;i 0){ pcm_buffer[i] = pcm_buffer[i] >> VOLUME_REDUCTION; } else { pcm_buffer[i] = -((-pcm_buffer[i]) >> VOLUME_REDUCTION); } } #endif } static int a2dp_demo_fill_sbc_audio_buffer(a2dp_media_sending_context_t * context){ // perform sbc encoding int total_num_bytes_read = 0; unsigned int num_audio_samples_per_sbc_buffer = sbc_encoder_instance->num_audio_frames(&sbc_encoder_state); uint16_t sbc_buffer_length = sbc_encoder_instance->sbc_buffer_length(&sbc_encoder_state); while (context->samples_ready >= num_audio_samples_per_sbc_buffer && (context->max_media_payload_size - context->sbc_storage_count) >= sbc_buffer_length){ int16_t pcm_frame[256*NUM_CHANNELS]; produce_audio(pcm_frame, num_audio_samples_per_sbc_buffer); // encode into sbc storage buffer, first byte contains sbc media header sbc_encoder_instance->encode_signed_16(&sbc_encoder_state, pcm_frame, &context->sbc_storage[1 + context->sbc_storage_count]); total_num_bytes_read += num_audio_samples_per_sbc_buffer; uint16_t sbc_frame_size = sbc_encoder_instance->sbc_buffer_length(&sbc_encoder_state); context->sbc_storage_count += sbc_frame_size; context->samples_ready -= num_audio_samples_per_sbc_buffer; } return total_num_bytes_read; } static void a2dp_demo_audio_timeout_handler(btstack_timer_source_t * timer){ a2dp_media_sending_context_t * context = (a2dp_media_sending_context_t *) btstack_run_loop_get_timer_context(timer); btstack_run_loop_set_timer(&context->audio_timer, AUDIO_TIMEOUT_MS); btstack_run_loop_add_timer(&context->audio_timer); uint32_t now = btstack_run_loop_get_time_ms(); uint32_t update_period_ms = AUDIO_TIMEOUT_MS; if (context->time_audio_data_sent > 0){ update_period_ms = now - context->time_audio_data_sent; } uint32_t num_samples = (update_period_ms * current_sample_rate) / 1000; context->acc_num_missed_samples += (update_period_ms * current_sample_rate) % 1000; while (context->acc_num_missed_samples >= 1000){ num_samples++; context->acc_num_missed_samples -= 1000; } context->time_audio_data_sent = now; context->samples_ready += num_samples; if (context->sbc_ready_to_send) return; a2dp_demo_fill_sbc_audio_buffer(context); if ((context->sbc_storage_count + sbc_encoder_instance->sbc_buffer_length(&sbc_encoder_state)) > context->max_media_payload_size){ // schedule sending context->sbc_ready_to_send = 1; a2dp_source_stream_endpoint_request_can_send_now(context->a2dp_cid, context->local_seid); } } static void a2dp_demo_timer_start(a2dp_media_sending_context_t * context){ context->max_media_payload_size = btstack_min(a2dp_max_media_payload_size(context->a2dp_cid, context->local_seid), SBC_STORAGE_SIZE); context->sbc_storage_count = 0; context->sbc_ready_to_send = 0; context->streaming = 1; btstack_run_loop_remove_timer(&context->audio_timer); btstack_run_loop_set_timer_handler(&context->audio_timer, a2dp_demo_audio_timeout_handler); btstack_run_loop_set_timer_context(&context->audio_timer, context); btstack_run_loop_set_timer(&context->audio_timer, AUDIO_TIMEOUT_MS); btstack_run_loop_add_timer(&context->audio_timer); } static void a2dp_demo_timer_stop(a2dp_media_sending_context_t * context){ context->time_audio_data_sent = 0; context->acc_num_missed_samples = 0; context->samples_ready = 0; context->streaming = 1; context->sbc_storage_count = 0; context->sbc_ready_to_send = 0; btstack_run_loop_remove_timer(&context->audio_timer); } static void dump_sbc_configuration(media_codec_configuration_sbc_t * configuration){ printf("Received media codec configuration:\n"); printf(" - num_channels: %d\n", configuration->num_channels); printf(" - sampling_frequency: %d\n", configuration->sampling_frequency); printf(" - channel_mode: %d\n", configuration->channel_mode); printf(" - block_length: %d\n", configuration->block_length); printf(" - subbands: %d\n", configuration->subbands); printf(" - allocation_method: %d\n", configuration->allocation_method); printf(" - bitpool_value [%d, %d] \n", configuration->min_bitpool_value, configuration->max_bitpool_value); } static void a2dp_source_demo_start_scanning(void){ printf("Start scanning...\n"); gap_inquiry_start(A2DP_SOURCE_DEMO_INQUIRY_DURATION_1280MS); scan_active = true; } static void hci_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ UNUSED(channel); UNUSED(size); if (packet_type != HCI_EVENT_PACKET) return; uint8_t status; UNUSED(status); bd_addr_t address; uint32_t cod; // Service Class: Rendering | Audio, Major Device Class: Audio const uint32_t bluetooth_speaker_cod = 0x200000 | 0x040000 | 0x000400; switch (hci_event_packet_get_type(packet)){ #ifndef HAVE_BTSTACK_STDIN case BTSTACK_EVENT_STATE: if (btstack_event_state_get_state(packet) != HCI_STATE_WORKING) return; a2dp_source_demo_start_scanning(); break; #endif case HCI_EVENT_PIN_CODE_REQUEST: printf("Pin code request - using '0000'\n"); hci_event_pin_code_request_get_bd_addr(packet, address); gap_pin_code_response(address, "0000"); break; case GAP_EVENT_INQUIRY_RESULT: gap_event_inquiry_result_get_bd_addr(packet, address); // print info printf("Device found: %s ", bd_addr_to_str(address)); cod = gap_event_inquiry_result_get_class_of_device(packet); printf("with COD: %06" PRIx32, cod); if (gap_event_inquiry_result_get_rssi_available(packet)){ printf(", rssi %d dBm", (int8_t) gap_event_inquiry_result_get_rssi(packet)); } if (gap_event_inquiry_result_get_name_available(packet)){ char name_buffer[240]; int name_len = gap_event_inquiry_result_get_name_len(packet); memcpy(name_buffer, gap_event_inquiry_result_get_name(packet), name_len); name_buffer[name_len] = 0; printf(", name '%s'", name_buffer); } printf("\n"); if ((cod & bluetooth_speaker_cod) == bluetooth_speaker_cod){ memcpy(device_addr, address, 6); printf("Bluetooth speaker detected, trying to connect to %s...\n", bd_addr_to_str(device_addr)); scan_active = false; gap_inquiry_stop(); a2dp_source_establish_stream(device_addr, &media_tracker.a2dp_cid); } break; case GAP_EVENT_INQUIRY_COMPLETE: if (scan_active){ printf("No Bluetooth speakers found, scanning again...\n"); gap_inquiry_start(A2DP_SOURCE_DEMO_INQUIRY_DURATION_1280MS); } break; default: break; } } static void a2dp_source_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ UNUSED(channel); UNUSED(size); uint8_t status; uint8_t local_seid; bd_addr_t address; uint16_t cid; avdtp_channel_mode_t channel_mode; uint8_t allocation_method; if (packet_type != HCI_EVENT_PACKET) return; if (hci_event_packet_get_type(packet) != HCI_EVENT_A2DP_META) return; switch (hci_event_a2dp_meta_get_subevent_code(packet)){ case A2DP_SUBEVENT_SIGNALING_CONNECTION_ESTABLISHED: a2dp_subevent_signaling_connection_established_get_bd_addr(packet, address); cid = a2dp_subevent_signaling_connection_established_get_a2dp_cid(packet); status = a2dp_subevent_signaling_connection_established_get_status(packet); if (status != ERROR_CODE_SUCCESS){ printf("A2DP Source: Connection failed, status 0x%02x, cid 0x%02x, a2dp_cid 0x%02x \n", status, cid, media_tracker.a2dp_cid); media_tracker.a2dp_cid = 0; break; } media_tracker.a2dp_cid = cid; media_tracker.volume = 32; 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); break; case A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION: cid = avdtp_subevent_signaling_media_codec_sbc_configuration_get_avdtp_cid(packet); if (cid != media_tracker.a2dp_cid) return; media_tracker.remote_seid = a2dp_subevent_signaling_media_codec_sbc_configuration_get_remote_seid(packet); sbc_configuration.reconfigure = a2dp_subevent_signaling_media_codec_sbc_configuration_get_reconfigure(packet); sbc_configuration.num_channels = a2dp_subevent_signaling_media_codec_sbc_configuration_get_num_channels(packet); sbc_configuration.sampling_frequency = a2dp_subevent_signaling_media_codec_sbc_configuration_get_sampling_frequency(packet); sbc_configuration.block_length = a2dp_subevent_signaling_media_codec_sbc_configuration_get_block_length(packet); sbc_configuration.subbands = a2dp_subevent_signaling_media_codec_sbc_configuration_get_subbands(packet); sbc_configuration.min_bitpool_value = a2dp_subevent_signaling_media_codec_sbc_configuration_get_min_bitpool_value(packet); sbc_configuration.max_bitpool_value = a2dp_subevent_signaling_media_codec_sbc_configuration_get_max_bitpool_value(packet); channel_mode = (avdtp_channel_mode_t) a2dp_subevent_signaling_media_codec_sbc_configuration_get_channel_mode(packet); allocation_method = a2dp_subevent_signaling_media_codec_sbc_configuration_get_allocation_method(packet); printf("A2DP Source: Received SBC codec configuration, sampling frequency %u, a2dp_cid 0x%02x, local seid 0x%02x, remote seid 0x%02x.\n", sbc_configuration.sampling_frequency, cid, a2dp_subevent_signaling_media_codec_sbc_configuration_get_local_seid(packet), a2dp_subevent_signaling_media_codec_sbc_configuration_get_remote_seid(packet)); // Adapt Bluetooth spec definition to SBC Encoder expected input sbc_configuration.allocation_method = (btstack_sbc_allocation_method_t)(allocation_method - 1); switch (channel_mode){ case AVDTP_CHANNEL_MODE_JOINT_STEREO: sbc_configuration.channel_mode = SBC_CHANNEL_MODE_JOINT_STEREO; break; case AVDTP_CHANNEL_MODE_STEREO: sbc_configuration.channel_mode = SBC_CHANNEL_MODE_STEREO; break; case AVDTP_CHANNEL_MODE_DUAL_CHANNEL: sbc_configuration.channel_mode = SBC_CHANNEL_MODE_DUAL_CHANNEL; break; case AVDTP_CHANNEL_MODE_MONO: sbc_configuration.channel_mode = SBC_CHANNEL_MODE_MONO; break; default: btstack_assert(false); break; } dump_sbc_configuration(&sbc_configuration); current_sample_rate = sbc_configuration.sampling_frequency; a2dp_demo_hexcmod_configure_sample_rate(current_sample_rate); sbc_encoder_instance = btstack_sbc_encoder_bluedroid_init_instance(&sbc_encoder_state); sbc_encoder_instance->configure(&sbc_encoder_state, SBC_MODE_STANDARD, sbc_configuration.block_length, sbc_configuration.subbands, sbc_configuration.allocation_method, sbc_configuration.sampling_frequency, sbc_configuration.max_bitpool_value, sbc_configuration.channel_mode); break; case A2DP_SUBEVENT_SIGNALING_DELAY_REPORTING_CAPABILITY: printf("A2DP Source: remote supports delay report, remote seid %d\n", avdtp_subevent_signaling_delay_reporting_capability_get_remote_seid(packet)); break; case A2DP_SUBEVENT_SIGNALING_CAPABILITIES_DONE: printf("A2DP Source: All capabilities reported, remote seid %d\n", avdtp_subevent_signaling_capabilities_done_get_remote_seid(packet)); break; case A2DP_SUBEVENT_SIGNALING_DELAY_REPORT: printf("A2DP Source: Received delay report of %d.%0d ms, local seid %d\n", avdtp_subevent_signaling_delay_report_get_delay_100us(packet)/10, avdtp_subevent_signaling_delay_report_get_delay_100us(packet)%10, avdtp_subevent_signaling_delay_report_get_local_seid(packet)); break; case A2DP_SUBEVENT_STREAM_ESTABLISHED: a2dp_subevent_stream_established_get_bd_addr(packet, address); status = a2dp_subevent_stream_established_get_status(packet); if (status != ERROR_CODE_SUCCESS){ printf("A2DP Source: Stream failed, status 0x%02x.\n", status); break; } local_seid = a2dp_subevent_stream_established_get_local_seid(packet); cid = a2dp_subevent_stream_established_get_a2dp_cid(packet); 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)); a2dp_demo_hexcmod_configure_sample_rate(current_sample_rate); media_tracker.stream_opened = 1; status = a2dp_source_start_stream(media_tracker.a2dp_cid, media_tracker.local_seid); break; case A2DP_SUBEVENT_STREAM_RECONFIGURED: status = a2dp_subevent_stream_reconfigured_get_status(packet); local_seid = a2dp_subevent_stream_reconfigured_get_local_seid(packet); cid = a2dp_subevent_stream_reconfigured_get_a2dp_cid(packet); if (status != ERROR_CODE_SUCCESS){ printf("A2DP Source: Stream reconfiguration failed, status 0x%02x\n", status); break; } printf("A2DP Source: Stream reconfigured a2dp_cid 0x%02x, local_seid 0x%02x\n", cid, local_seid); a2dp_demo_hexcmod_configure_sample_rate(new_sample_rate); status = a2dp_source_start_stream(media_tracker.a2dp_cid, media_tracker.local_seid); break; case A2DP_SUBEVENT_STREAM_STARTED: local_seid = a2dp_subevent_stream_started_get_local_seid(packet); cid = a2dp_subevent_stream_started_get_a2dp_cid(packet); play_info.status = AVRCP_PLAYBACK_STATUS_PLAYING; if (media_tracker.avrcp_cid){ avrcp_target_set_now_playing_info(media_tracker.avrcp_cid, &tracks[data_source], sizeof(tracks)/sizeof(avrcp_track_t)); avrcp_target_set_playback_status(media_tracker.avrcp_cid, AVRCP_PLAYBACK_STATUS_PLAYING); } a2dp_demo_timer_start(&media_tracker); printf("A2DP Source: Stream started, a2dp_cid 0x%02x, local_seid 0x%02x\n", cid, local_seid); break; case A2DP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW: local_seid = a2dp_subevent_streaming_can_send_media_packet_now_get_local_seid(packet); cid = a2dp_subevent_signaling_media_codec_sbc_configuration_get_a2dp_cid(packet); a2dp_demo_send_media_packet(); break; case A2DP_SUBEVENT_STREAM_SUSPENDED: local_seid = a2dp_subevent_stream_suspended_get_local_seid(packet); cid = a2dp_subevent_stream_suspended_get_a2dp_cid(packet); play_info.status = AVRCP_PLAYBACK_STATUS_PAUSED; if (media_tracker.avrcp_cid){ avrcp_target_set_playback_status(media_tracker.avrcp_cid, AVRCP_PLAYBACK_STATUS_PAUSED); } printf("A2DP Source: Stream paused, a2dp_cid 0x%02x, local_seid 0x%02x\n", cid, local_seid); a2dp_demo_timer_stop(&media_tracker); break; case A2DP_SUBEVENT_STREAM_RELEASED: play_info.status = AVRCP_PLAYBACK_STATUS_STOPPED; cid = a2dp_subevent_stream_released_get_a2dp_cid(packet); local_seid = a2dp_subevent_stream_released_get_local_seid(packet); printf("A2DP Source: Stream released, a2dp_cid 0x%02x, local_seid 0x%02x\n", cid, local_seid); if (cid == media_tracker.a2dp_cid) { media_tracker.stream_opened = 0; printf("A2DP Source: Stream released.\n"); } if (media_tracker.avrcp_cid){ avrcp_target_set_now_playing_info(media_tracker.avrcp_cid, NULL, sizeof(tracks)/sizeof(avrcp_track_t)); avrcp_target_set_playback_status(media_tracker.avrcp_cid, AVRCP_PLAYBACK_STATUS_STOPPED); } a2dp_demo_timer_stop(&media_tracker); break; case A2DP_SUBEVENT_SIGNALING_CONNECTION_RELEASED: cid = a2dp_subevent_signaling_connection_released_get_a2dp_cid(packet); if (cid == media_tracker.a2dp_cid) { media_tracker.avrcp_cid = 0; media_tracker.a2dp_cid = 0; printf("A2DP Source: Signaling released.\n\n"); } break; default: break; } } static void avrcp_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ UNUSED(channel); UNUSED(size); bd_addr_t event_addr; uint16_t local_cid; uint8_t status = ERROR_CODE_SUCCESS; if (packet_type != HCI_EVENT_PACKET) return; if (hci_event_packet_get_type(packet) != HCI_EVENT_AVRCP_META) return; switch (packet[2]){ case AVRCP_SUBEVENT_CONNECTION_ESTABLISHED: local_cid = avrcp_subevent_connection_established_get_avrcp_cid(packet); status = avrcp_subevent_connection_established_get_status(packet); if (status != ERROR_CODE_SUCCESS){ printf("AVRCP: Connection failed, local cid 0x%02x, status 0x%02x\n", local_cid, status); return; } media_tracker.avrcp_cid = local_cid; avrcp_subevent_connection_established_get_bd_addr(packet, event_addr); printf("AVRCP: Channel to %s successfully opened, avrcp_cid 0x%02x\n", bd_addr_to_str(event_addr), media_tracker.avrcp_cid); avrcp_target_support_event(media_tracker.avrcp_cid, AVRCP_NOTIFICATION_EVENT_PLAYBACK_STATUS_CHANGED); avrcp_target_support_event(media_tracker.avrcp_cid, AVRCP_NOTIFICATION_EVENT_TRACK_CHANGED); avrcp_target_support_event(media_tracker.avrcp_cid, AVRCP_NOTIFICATION_EVENT_NOW_PLAYING_CONTENT_CHANGED); avrcp_target_set_now_playing_info(media_tracker.avrcp_cid, NULL, sizeof(tracks)/sizeof(avrcp_track_t)); printf("Enable Volume Change notification\n"); avrcp_controller_enable_notification(media_tracker.avrcp_cid, AVRCP_NOTIFICATION_EVENT_VOLUME_CHANGED); printf("Enable Battery Status Change notification\n"); avrcp_controller_enable_notification(media_tracker.avrcp_cid, AVRCP_NOTIFICATION_EVENT_BATT_STATUS_CHANGED); return; case AVRCP_SUBEVENT_CONNECTION_RELEASED: printf("AVRCP Target: Disconnected, avrcp_cid 0x%02x\n", avrcp_subevent_connection_released_get_avrcp_cid(packet)); media_tracker.avrcp_cid = 0; return; default: break; } if (status != ERROR_CODE_SUCCESS){ printf("Responding to event 0x%02x failed, status 0x%02x\n", packet[2], status); } } static void avrcp_target_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ UNUSED(channel); UNUSED(size); uint8_t status = ERROR_CODE_SUCCESS; if (packet_type != HCI_EVENT_PACKET) return; if (hci_event_packet_get_type(packet) != HCI_EVENT_AVRCP_META) return; bool button_pressed; char const * button_state; avrcp_operation_id_t operation_id; switch (packet[2]){ case AVRCP_SUBEVENT_PLAY_STATUS_QUERY: status = avrcp_target_play_status(media_tracker.avrcp_cid, play_info.song_length_ms, play_info.song_position_ms, play_info.status); break; // case AVRCP_SUBEVENT_NOW_PLAYING_INFO_QUERY: // status = avrcp_target_now_playing_info(avrcp_cid); // break; case AVRCP_SUBEVENT_OPERATION: operation_id = avrcp_subevent_operation_get_operation_id(packet); button_pressed = avrcp_subevent_operation_get_button_pressed(packet) > 0; button_state = button_pressed ? "PRESS" : "RELEASE"; printf("AVRCP Target: operation %s (%s)\n", avrcp_operation2str(operation_id), button_state); if (!button_pressed){ break; } switch (operation_id) { case AVRCP_OPERATION_ID_PLAY: status = a2dp_source_start_stream(media_tracker.a2dp_cid, media_tracker.local_seid); break; case AVRCP_OPERATION_ID_PAUSE: status = a2dp_source_pause_stream(media_tracker.a2dp_cid, media_tracker.local_seid); break; case AVRCP_OPERATION_ID_STOP: status = a2dp_source_disconnect(media_tracker.a2dp_cid); break; default: break; } break; default: break; } if (status != ERROR_CODE_SUCCESS){ printf("Responding to event 0x%02x failed, status 0x%02x\n", packet[2], status); } } static void avrcp_controller_packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ UNUSED(channel); UNUSED(size); if (packet_type != HCI_EVENT_PACKET) return; if (hci_event_packet_get_type(packet) != HCI_EVENT_AVRCP_META) return; if (!media_tracker.avrcp_cid) return; switch (packet[2]){ case AVRCP_SUBEVENT_NOTIFICATION_VOLUME_CHANGED: printf("AVRCP Controller: Notification Absolute Volume %d %%\n", avrcp_subevent_notification_volume_changed_get_absolute_volume(packet) * 100 / 127); break; case AVRCP_SUBEVENT_NOTIFICATION_EVENT_BATT_STATUS_CHANGED: // see avrcp_battery_status_t printf("AVRCP Controller: Notification Battery Status 0x%02x\n", avrcp_subevent_notification_event_batt_status_changed_get_battery_status(packet)); break; case AVRCP_SUBEVENT_NOTIFICATION_STATE: printf("AVRCP Controller: Notification %s - %s\n", avrcp_event2str(avrcp_subevent_notification_state_get_event_id(packet)), avrcp_subevent_notification_state_get_enabled(packet) != 0 ? "enabled" : "disabled"); break; default: break; } } #ifdef HAVE_BTSTACK_STDIN static void show_usage(void){ bd_addr_t iut_address; gap_local_bd_addr(iut_address); printf("\n--- Bluetooth A2DP Source/AVRCP Demo %s ---\n", bd_addr_to_str(iut_address)); printf("a - Scan for Bluetooth speaker and connect\n"); printf("b - A2DP Source create connection to addr %s\n", device_addr_string); printf("B - A2DP Source disconnect\n"); printf("c - AVRCP create connection to addr %s\n", device_addr_string); printf("C - AVRCP disconnect\n"); printf("D - delete all link keys\n"); printf("x - start streaming sine\n"); if (hxcmod_initialized){ printf("z - start streaming '%s'\n", mod_name); } printf("p - pause streaming\n"); printf("w - reconfigure stream for 44100 Hz\n"); printf("e - reconfigure stream for 48000 Hz\n"); printf("t - volume up\n"); printf("T - volume down\n"); printf("v - volume up (via set absolute volume)\n"); printf("V - volume down (via set absolute volume)\n"); printf("---\n"); } static void stdin_process(char cmd){ uint8_t status = ERROR_CODE_SUCCESS; switch (cmd){ case 'a': a2dp_source_demo_start_scanning(); break; case 'b': status = a2dp_source_establish_stream(device_addr, &media_tracker.a2dp_cid); printf("%c - Create A2DP Source connection to addr %s, cid 0x%02x.\n", cmd, bd_addr_to_str(device_addr), media_tracker.a2dp_cid); break; case 'B': printf("%c - A2DP Source Disconnect from cid 0x%2x\n", cmd, media_tracker.a2dp_cid); status = a2dp_source_disconnect(media_tracker.a2dp_cid); break; case 'c': printf("%c - Create AVRCP connection to addr %s.\n", cmd, bd_addr_to_str(device_addr)); status = avrcp_connect(device_addr, &media_tracker.avrcp_cid); break; case 'C': printf("%c - AVRCP disconnect\n", cmd); status = avrcp_disconnect(media_tracker.avrcp_cid); break; case 'D': printf("Deleting all link keys\n"); gap_delete_all_link_keys(); break; case '\n': case '\r': break; case 't': printf(" - volume up\n"); status = avrcp_controller_volume_up(media_tracker.avrcp_cid); break; case 'T': printf(" - volume down\n"); status = avrcp_controller_volume_down(media_tracker.avrcp_cid); break; case 'v': if (media_tracker.volume > 117){ media_tracker.volume = 127; } else { media_tracker.volume += 10; } printf(" - volume up (via set absolute volume) %d%% (%d)\n", media_tracker.volume * 100 / 127, media_tracker.volume); status = avrcp_controller_set_absolute_volume(media_tracker.avrcp_cid, media_tracker.volume); break; case 'V': if (media_tracker.volume < 10){ media_tracker.volume = 0; } else { media_tracker.volume -= 10; } printf(" - volume down (via set absolute volume) %d%% (%d)\n", media_tracker.volume * 100 / 127, media_tracker.volume); status = avrcp_controller_set_absolute_volume(media_tracker.avrcp_cid, media_tracker.volume); break; case 'x': if (media_tracker.avrcp_cid){ avrcp_target_set_now_playing_info(media_tracker.avrcp_cid, &tracks[data_source], sizeof(tracks)/sizeof(avrcp_track_t)); } printf("%c - Play sine.\n", cmd); data_source = STREAM_SINE; if (!media_tracker.stream_opened) break; status = a2dp_source_start_stream(media_tracker.a2dp_cid, media_tracker.local_seid); break; case 'z': if (media_tracker.avrcp_cid){ avrcp_target_set_now_playing_info(media_tracker.avrcp_cid, &tracks[data_source], sizeof(tracks)/sizeof(avrcp_track_t)); } printf("%c - Play mod.\n", cmd); data_source = STREAM_MOD; if (!media_tracker.stream_opened) break; status = a2dp_source_start_stream(media_tracker.a2dp_cid, media_tracker.local_seid); break; case 'p': if (!media_tracker.stream_opened) break; printf("%c - Pause stream.\n", cmd); status = a2dp_source_pause_stream(media_tracker.a2dp_cid, media_tracker.local_seid); break; case 'w': if (!media_tracker.stream_opened) break; if (play_info.status == AVRCP_PLAYBACK_STATUS_PLAYING){ printf("Stream cannot be reconfigured while playing, please pause stream first\n"); break; } new_sample_rate = 44100; if (current_sample_rate == new_sample_rate){ printf("%c - Stream already configured for %d Hz.\n", cmd, new_sample_rate); } else { printf("%c - Reconfigure for %d Hz.\n", cmd, new_sample_rate); status = a2dp_source_reconfigure_stream_sampling_frequency(media_tracker.a2dp_cid, new_sample_rate); } break; case 'e': if (!media_tracker.stream_opened) break; if (play_info.status == AVRCP_PLAYBACK_STATUS_PLAYING){ printf("Stream cannot be reconfigured while playing, please pause stream first\n"); break; } new_sample_rate = 48000; if (current_sample_rate == new_sample_rate){ printf("%c - Stream already configured for %d Hz.\n", cmd, new_sample_rate); } else { printf("%c - Reconfigure for %d Hz.\n", cmd, new_sample_rate); status = a2dp_source_reconfigure_stream_sampling_frequency(media_tracker.a2dp_cid, new_sample_rate); } break; default: show_usage(); return; } if (status != ERROR_CODE_SUCCESS){ printf("Could not perform command \'%c\', status 0x%02x\n", cmd, status); } } #endif int btstack_main(int argc, const char * argv[]); int btstack_main(int argc, const char * argv[]){ (void)argc; (void)argv; int err = a2dp_source_and_avrcp_services_init(); if (err) return err; // turn on! hci_power_control(HCI_POWER_ON); return 0; } /* EXAMPLE_END */