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btstack/example/a2dp_source_demo.c

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/*
* 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 <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#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
#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;
uint8_t sbc_storage[SBC_STORAGE_SIZE];
uint16_t sbc_storage_count;
uint8_t sbc_ready_to_send;
uint16_t volume;
} a2dp_media_sending_context_t;
static uint8_t media_sbc_codec_capabilities[] = {
(AVDTP_SBC_44100 << 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;
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;
// pts: static const char * device_addr_string = "00:1B:DC:08:0A:A5";
// pts: static const char * device_addr_string = "00:1B:DC:08:E2:72";
// mac 2013: static const char * device_addr_string = "84:38:35:65:d1:15";
// phone 2013: static const char * device_addr_string = "D8:BB:2C:DF:F0:F2";
// Minijambox:
static const char * device_addr_string = "00:21:3C:AC:F7:38";
// Philips SHB9100: static const char * device_addr_string = "00:22:37:05:FD:E8";
// RT-B6: static const char * device_addr_string = "00:75:58:FF:C9:7D";
// BT dongle: static const char * device_addr_string = "00:1A:7D:DA:71:0A";
// Sony MDR-ZX330BT static const char * device_addr_string = "00:18:09:28:50:18";
// Panda (BM6) static const char * device_addr_string = "4F:3F:66:52:8B:E0";
// BeatsX: static const char * device_addr_string = "DC:D3:A2:89:57:FB";
// Green mushroom: static const char * device_addr_string = "41:42:2A:ED:D6:F3";
static bd_addr_t device_addr;
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 btstack_sbc_encoder_state_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);
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;
}
// 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, 0x10001, AVDTP_SOURCE_FEATURE_MASK_PLAYER, NULL, NULL);
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, 0x10002, supported_features, NULL, NULL);
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, 0x10003, controller_supported_features, NULL, NULL);
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, 0x10004, DEVICE_ID_VENDOR_ID_SOURCE_BLUETOOTH, BLUETOOTH_COMPANY_ID_BLUEKITCHEN_GMBH, 1, 1);
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);
a2dp_demo_hexcmod_configure_sample_rate(current_sample_rate);
// 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 = btstack_sbc_encoder_sbc_buffer_length();
int bytes_in_storage = media_tracker.sbc_storage_count;
uint8_t num_frames = bytes_in_storage / num_bytes_in_frame;
// Prepend SBC Header
media_tracker.sbc_storage[0] = num_frames; // (fragmentation << 7) | (starting_packet << 6) | (last_packet << 5) | num_frames;
avdtp_source_stream_send_media_payload_rtp(media_tracker.a2dp_cid, media_tracker.local_seid, 0, media_tracker.sbc_storage, bytes_in_storage + 1);
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<num_samples*2;i++){
if (pcm_buffer[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 = btstack_sbc_encoder_num_audio_frames();
while (context->samples_ready >= num_audio_samples_per_sbc_buffer
&& (context->max_media_payload_size - context->sbc_storage_count) >= btstack_sbc_encoder_sbc_buffer_length()){
int16_t pcm_frame[256*NUM_CHANNELS];
produce_audio(pcm_frame, num_audio_samples_per_sbc_buffer);
btstack_sbc_encoder_process_data(pcm_frame);
uint16_t sbc_frame_size = btstack_sbc_encoder_sbc_buffer_length();
uint8_t * sbc_frame = btstack_sbc_encoder_sbc_buffer();
total_num_bytes_read += num_audio_samples_per_sbc_buffer;
// first byte in sbc storage contains sbc media header
memcpy(&context->sbc_storage[1 + context->sbc_storage_count], sbc_frame, sbc_frame_size);
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 + btstack_sbc_encoder_sbc_buffer_length()) > 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 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;
#ifndef HAVE_BTSTACK_STDIN
if (hci_event_packet_get_type(packet) == BTSTACK_EVENT_STATE){
if (btstack_event_state_get_state(packet) != HCI_STATE_WORKING) return;
printf("Create A2DP Source connection to addr %s.\n", bd_addr_to_str(device_addr));
uint8_t status = a2dp_source_establish_stream(device_addr, &media_tracker.a2dp_cid);
if (status != ERROR_CODE_SUCCESS){
printf("Could not perform command, status 0x%2x\n", status);
}
return;
}
#endif
if (hci_event_packet_get_type(packet) == HCI_EVENT_PIN_CODE_REQUEST) {
bd_addr_t address;
printf("Pin code request - using '0000'\n");
hci_event_pin_code_request_get_bd_addr(packet, address);
gap_pin_code_response(address, "0000");
}
}
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);
btstack_sbc_encoder_init(&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;
data_source = STREAM_MOD;
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 with 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 with 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 with 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 %d\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("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 '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 */
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