mirror/btstack
1
0
Fork 0
mirror of https://github.com/bluekitchen/btstack.git synced 2025-01-10 10:21:48 +00:00
Code Issues Packages Projects Releases Wiki Activity
36e9f39cd5
btstack/example/a2dp_source_demo.c

451 lines
18 KiB
C
Raw Blame History

/*
* 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 MATTHIAS
* RINGWALD 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
*
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "btstack.h"
#include "hxcmod.h"
#include "mods/mod.h"
#define NUM_CHANNELS 2
#define A2DP_SAMPLE_RATE 44100
#define BYTES_PER_AUDIO_SAMPLE (2*NUM_CHANNELS)
#define AUDIO_TIMEOUT_MS 10
#define TABLE_SIZE_441HZ 100
typedef enum {
STREAM_SINE,
STREAM_MOD
} stream_data_source_t;
typedef struct {
uint16_t a2dp_cid;
uint8_t local_seid;
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[1030];
uint16_t sbc_storage_count;
uint8_t sbc_ready_to_send;
} 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
};
static const int16_t sine_int16[] = {
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 char * device_name = "A2DP Source BTstack";
#ifdef HAVE_BTSTACK_STDIN
// mac 2011: static const char * device_addr_string = "04:0C:CE:E4:85:D3";
// pts: static const char * device_addr_string = "00:1B:DC:08:0A:A5";
// 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";
// head phones: static const char * device_addr_string = "00:18:09:28:50:18";
// bt dongle: static const char * device_addr_string = "00:15:83:5F:9D:46";
#endif
static bd_addr_t device_addr;
static uint8_t sdp_a2dp_source_service_buffer[150];
static uint8_t media_sbc_codec_configuration[4];
static a2dp_media_sending_context_t media_tracker;
static uint16_t avrcp_cid;
static stream_data_source_t data_source;
static int sine_phase;
static int hxcmod_initialized;
static modcontext mod_context;
static tracker_buffer_state trkbuf;
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;
a2dp_source_stream_send_media_payload(media_tracker.local_seid, media_tracker.sbc_storage, bytes_in_storage, num_frames, 0);
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++){
pcm_buffer[count * 2] = sine_int16[sine_phase];
pcm_buffer[count * 2 + 1] = sine_int16[sine_phase];
sine_phase++;
if (sine_phase >= TABLE_SIZE_441HZ){
sine_phase -= TABLE_SIZE_441HZ;
}
}
}
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;
}
}
static int a2dp_demo_fill_sbc_audio_buffer(a2dp_media_sending_context_t * context){
// perform sbc encodin
int total_num_bytes_read = 0;
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()){
uint8_t pcm_frame[256*BYTES_PER_AUDIO_SAMPLE];
produce_audio((int16_t *) pcm_frame, num_audio_samples_per_sbc_buffer);
btstack_sbc_encoder_process_data((int16_t *) 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;
memcpy(&context->sbc_storage[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 * A2DP_SAMPLE_RATE) / 1000;
context->acc_num_missed_samples += (update_period_ms * A2DP_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->local_seid);
}
}
static void a2dp_demo_timer_start(a2dp_media_sending_context_t * context){
context->max_media_payload_size = a2dp_max_media_payload_size(context->local_seid);
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 a2dp_demo_timer_pause(a2dp_media_sending_context_t * context){
btstack_run_loop_remove_timer(&context->audio_timer);
}
static void 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;
switch (packet_type) {
case HCI_EVENT_PACKET:
switch (hci_event_packet_get_type(packet)) {
case HCI_EVENT_A2DP_META:
switch (packet[2]){
case A2DP_SUBEVENT_STREAM_ESTABLISHED:
status = a2dp_subevent_stream_established_get_status(packet);
if (status){
printf("Stream establishment failed: status 0x%02x.\n", status);
break;
}
local_seid = a2dp_subevent_stream_established_get_local_seid(packet);
if (local_seid != media_tracker.local_seid){
printf("Stream establishment failed: wrong local seid %d, expected %d.\n", local_seid, media_tracker.local_seid);
break;
}
media_tracker.a2dp_cid = a2dp_subevent_stream_established_get_a2dp_cid(packet);
printf("Stream established: a2dp cid 0x%02x, local seid %d, remote seid %d.\n",
media_tracker.a2dp_cid, media_tracker.local_seid, a2dp_subevent_stream_established_get_remote_seid(packet));
break;
case A2DP_SUBEVENT_STREAM_STARTED:
a2dp_demo_timer_start(&media_tracker);
printf("Stream started.\n");
break;
case A2DP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW:
a2dp_demo_send_media_packet();
break;
case A2DP_SUBEVENT_STREAM_SUSPENDED:
printf("Stream paused.\n");
a2dp_demo_timer_pause(&media_tracker);
break;
case A2DP_SUBEVENT_STREAM_RELEASED:
printf("Stream released.\n");
a2dp_demo_timer_stop(&media_tracker);
break;
default:
printf("AVDTP Source demo: event 0x%02x is not implemented\n", packet[2]);
break;
}
break;
default:
break;
}
break;
default:
// other packet type
break;
}
}
static void avrcp_target_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 = 0xFF;
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);
if (avrcp_cid != 0 && avrcp_cid != local_cid) {
printf("AVRCP Connection failed, expected 0x%02X l2cap cid, received 0x%02X\n", avrcp_cid, local_cid);
return;
}
status = avrcp_subevent_connection_established_get_status(packet);
if (status != ERROR_CODE_SUCCESS){
printf("AVRCP Connection failed: status 0x%02x\n", status);
avrcp_cid = 0;
return;
}
avrcp_cid = local_cid;
avrcp_subevent_connection_established_get_bd_addr(packet, event_addr);
printf("Channel successfully opened: %s, avrcp_cid 0x%02x\n", bd_addr_to_str(event_addr), local_cid);
return;
}
case AVRCP_SUBEVENT_CONNECTION_RELEASED:
printf("Channel released: avrcp_cid 0x%02x\n", avrcp_subevent_connection_released_get_avrcp_cid(packet));
avrcp_cid = 0;
return;
default:
printf("A2DP Source/AVRCP Target event not parsed %02x\n", packet[2]);
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 Target Demo %s ---\n", bd_addr_to_str(iut_address));
printf("b - AVDTP Source create connection to addr %s\n", device_addr_string);
printf("B - AVDTP Source disconnect\n");
printf("c - AVRCP Target create connection to addr %s\n", device_addr_string);
printf("C - AVRCP Target disconnect\n");
printf("x - start streaming sine\n");
if (hxcmod_initialized){
printf("z - start streaming '%s'\n", mod_name);
}
printf("p - pause streaming\n");
printf("\n--- Bluetooth AVRCP Target Commands %s ---\n", bd_addr_to_str(iut_address));
printf("Ctrl-c - exit\n");
printf("---\n");
}
static void stdin_process(char cmd){
switch (cmd){
case 'b':
printf(" - Create AVDTP Source connection to addr %s.\n", bd_addr_to_str(device_addr));
a2dp_source_establish_stream(device_addr, media_tracker.local_seid, &media_tracker.a2dp_cid);
break;
case 'B':
printf(" - AVDTP Source Disconnect\n");
a2dp_source_disconnect(media_tracker.a2dp_cid);
break;
case 'c':
printf(" - Create AVRCP Target connection to addr %s.\n", bd_addr_to_str(device_addr));
avrcp_target_connect(device_addr, &avrcp_cid);
printf(" assigned avrcp cid 0x%02x\n", avrcp_cid);
break;
case 'C':
printf(" - AVRCP Target disconnect\n");
avrcp_target_disconnect(avrcp_cid);
break;
case '\n':
case '\r':
break;
case 'x':
printf("Playing sine.\n");
data_source = STREAM_SINE;
a2dp_source_start_stream(media_tracker.a2dp_cid, media_tracker.local_seid);
break;
case 'z':
printf("Playing mod.\n");
data_source = STREAM_MOD;
a2dp_source_start_stream(media_tracker.a2dp_cid, media_tracker.local_seid);
break;
case 'p':
printf("Pause stream.\n");
a2dp_source_pause_stream(media_tracker.a2dp_cid, media_tracker.local_seid);
break;
default:
show_usage();
break;
}
}
#endif
int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){
UNUSED(argc);
(void)argv;
l2cap_init();
// Initialize AVDTP Source
a2dp_source_init();
a2dp_source_register_packet_handler(&packet_handler);
media_tracker.local_seid = 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));
// Initialize AVRCP Target
avrcp_target_init();
avrcp_target_register_packet_handler(&avrcp_target_packet_handler);
// Initialize SDP
sdp_init();
memset(sdp_a2dp_source_service_buffer, 0, sizeof(sdp_a2dp_source_service_buffer));
a2dp_source_create_sdp_record(sdp_a2dp_source_service_buffer, 0x10002, 1, NULL, NULL);
sdp_register_service(sdp_a2dp_source_service_buffer);
gap_set_local_name(device_name);
gap_discoverable_control(1);
gap_set_class_of_device(0x200408);
hxcmod_initialized = hxcmod_init(&mod_context);
if (hxcmod_initialized){
hxcmod_setcfg(&mod_context, A2DP_SAMPLE_RATE, 16, 1, 1, 1);
hxcmod_load(&mod_context, (void *) &mod_data, mod_len);
printf("loaded mod '%s', size %u\n", mod_name, mod_len);
}
#ifdef HAVE_BTSTACK_STDIN
// parse human readable Bluetooth address
sscanf_bd_addr(device_addr_string, device_addr);
btstack_stdin_setup(stdin_process);
#endif
// turn on!
hci_power_control(HCI_POWER_ON);
return 0;
}
Reference in New Issue View Git Blame Copy Permalink