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OVMS3-idf/examples/bluetooth/a2dp_source/main/main.c
wangmengyang f360fe5b3e component/bt: implement A2DP source 
1. Modified symbol names of A2DP sink APIs include:
- esp_a2d_data_cb_t --> esp_a2d_sink_data_cb_t
- esp_a2d_register_data_callback --> esp_a2d_sink_register_data_callback
2018-01-09 20:20:52 +08:00

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// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/timers.h"
#include "nvs.h"
#include "nvs_flash.h"
#include "esp_system.h"
#include "esp_log.h"
#include "esp_bt.h"
#include "bt_app_core.h"
#include "esp_bt_main.h"
#include "esp_bt_device.h"
#include "esp_gap_bt_api.h"
#include "esp_a2dp_api.h"
#include "esp_avrc_api.h"
#define BT_AV_TAG "BT_AV"
/* event for handler "bt_av_hdl_stack_up */
enum {
BT_APP_EVT_STACK_UP = 0,
};
/* A2DP global state */
enum {
APP_AV_STATE_IDLE,
APP_AV_STATE_DISCOVERING,
APP_AV_STATE_DISCOVERED,
APP_AV_STATE_UNCONNECTED,
APP_AV_STATE_CONNECTING,
APP_AV_STATE_CONNECTED,
APP_AV_STATE_DISCONNECTING,
};
/* sub states of APP_AV_STATE_CONNECTED */
enum {
APP_AV_MEDIA_STATE_IDLE,
APP_AV_MEDIA_STATE_STARTING,
APP_AV_MEDIA_STATE_STARTED,
APP_AV_MEDIA_STATE_STOPPING,
};
#define BT_APP_HEART_BEAT_EVT (0xff00)
/// handler for bluetooth stack enabled events
static void bt_av_hdl_stack_evt(uint16_t event, void *p_param);
/// callback function for A2DP source
static void bt_app_a2d_cb(esp_a2d_cb_event_t event, esp_a2d_cb_param_t *param);
/// callback function for A2DP source audio data stream
static int32_t bt_app_a2d_data_cb(uint8_t *data, int32_t len);
static void a2d_app_heart_beat(void *arg);
/// A2DP application state machine
static void bt_app_av_sm_hdlr(uint16_t event, void *param);
/* A2DP application state machine handler for each state */
static void bt_app_av_state_unconnected(uint16_t event, void *param);
static void bt_app_av_state_connecting(uint16_t event, void *param);
static void bt_app_av_state_connected(uint16_t event, void *param);
static void bt_app_av_state_disconnecting(uint16_t event, void *param);
static esp_bd_addr_t peer_bda = {0};
static uint8_t peer_bdname[ESP_BT_GAP_MAX_BDNAME_LEN + 1];
static int m_a2d_state = APP_AV_STATE_IDLE;
static int m_media_state = APP_AV_MEDIA_STATE_IDLE;
static int m_intv_cnt = 0;
static int m_connecting_intv = 0;
static uint32_t m_pkt_cnt = 0;
TimerHandle_t tmr;
static char *bda2str(esp_bd_addr_t bda, char *str, size_t size)
{
if (bda == NULL || str == NULL || size < 18) {
return NULL;
}
uint8_t *p = bda;
sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x",
p[0], p[1], p[2], p[3], p[4], p[5]);
return str;
}
void app_main()
{
// Initialize NVS.
esp_err_t ret = nvs_flash_init();
if (ret == ESP_ERR_NVS_NO_FREE_PAGES) {
ESP_ERROR_CHECK(nvs_flash_erase());
ret = nvs_flash_init();
}
ESP_ERROR_CHECK( ret );
esp_bt_controller_config_t bt_cfg = BT_CONTROLLER_INIT_CONFIG_DEFAULT();
if (esp_bt_controller_init(&bt_cfg) != ESP_OK) {
ESP_LOGE(BT_AV_TAG, "%s initialize controller failed\n", __func__);
return;
}
if (esp_bt_controller_enable(ESP_BT_MODE_BTDM) != ESP_OK) {
ESP_LOGE(BT_AV_TAG, "%s enable controller failed\n", __func__);
return;
}
if (esp_bluedroid_init() != ESP_OK) {
ESP_LOGE(BT_AV_TAG, "%s initialize bluedroid failed\n", __func__);
return;
}
if (esp_bluedroid_enable() != ESP_OK) {
ESP_LOGE(BT_AV_TAG, "%s enable bluedroid failed\n", __func__);
return;
}
/* create application task */
bt_app_task_start_up();
/* Bluetooth device name, connection mode and profile set up */
bt_app_work_dispatch(bt_av_hdl_stack_evt, BT_APP_EVT_STACK_UP, NULL, 0, NULL);
}
static bool get_name_from_eir(uint8_t *eir, uint8_t *bdname, uint8_t *bdname_len)
{
uint8_t *rmt_bdname = NULL;
uint8_t rmt_bdname_len = 0;
if (!eir) {
return false;
}
rmt_bdname = esp_bt_gap_resolve_eir_data(eir, ESP_BT_EIR_TYPE_CMPL_LOCAL_NAME, &rmt_bdname_len);
if (!rmt_bdname) {
rmt_bdname = esp_bt_gap_resolve_eir_data(eir, ESP_BT_EIR_TYPE_SHORT_LOCAL_NAME, &rmt_bdname_len);
}
if (rmt_bdname) {
if (rmt_bdname_len > ESP_BT_GAP_MAX_BDNAME_LEN) {
rmt_bdname_len = ESP_BT_GAP_MAX_BDNAME_LEN;
}
if (bdname) {
memcpy(bdname, rmt_bdname, rmt_bdname_len);
bdname[rmt_bdname_len] = '\0';
}
if (bdname_len) {
*bdname_len = rmt_bdname_len;
}
return true;
}
return false;
}
static void filter_inquiry_scan_result(esp_bt_gap_cb_param_t *param)
{
char bda_str[18];
uint32_t cod = 0;
int32_t rssi = -129; /* invalid value */
uint8_t *eir = NULL;
esp_bt_gap_dev_prop_t *p;
ESP_LOGI(BT_AV_TAG, "Scanned device: %s", bda2str(param->disc_res.bda, bda_str, 18));
for (int i = 0; i < param->disc_res.num_prop; i++) {
p = param->disc_res.prop + i;
switch (p->type) {
case ESP_BT_GAP_DEV_PROP_COD:
cod = *(uint32_t *)(p->val);
ESP_LOGI(BT_AV_TAG, "--Class of Device: 0x%x", cod);
break;
case ESP_BT_GAP_DEV_PROP_RSSI:
rssi = *(int8_t *)(p->val);
ESP_LOGI(BT_AV_TAG, "--RSSI: %d", rssi);
break;
case ESP_BT_GAP_DEV_PROP_EIR:
eir = (uint8_t *)(p->val);
break;
case ESP_BT_GAP_DEV_PROP_BDNAME:
default:
break;
}
}
/* search for device with MAJOR service class as "rendering" in COD */
if (!esp_bt_gap_is_valid_cod(cod) ||
!(esp_bt_gap_get_cod_srvc(cod) & ESP_BT_COD_SRVC_RENDERING)) {
return;
}
/* search for device named "ESP_SPEAKER" in its extended inqury response */
if (eir) {
get_name_from_eir(eir, peer_bdname, NULL);
if (strcmp((char *)peer_bdname, "ESP_SPEAKER") != 0) {
return;
}
ESP_LOGI(BT_AV_TAG, "Found a target device, address %s, name %s", bda_str, peer_bdname);
m_a2d_state = APP_AV_STATE_DISCOVERED;
memcpy(peer_bda, param->disc_res.bda, ESP_BD_ADDR_LEN);
ESP_LOGI(BT_AV_TAG, "Cancel device discovery ...");
esp_bt_gap_cancel_discovery();
}
}
void bt_app_gap_cb(esp_bt_gap_cb_event_t event, esp_bt_gap_cb_param_t *param)
{
switch (event) {
case ESP_BT_GAP_DISC_RES_EVT: {
filter_inquiry_scan_result(param);
break;
}
case ESP_BT_GAP_DISC_STATE_CHANGED_EVT: {
if (param->disc_st_chg.state == ESP_BT_GAP_DISCOVERY_STOPPED) {
if (m_a2d_state == APP_AV_STATE_DISCOVERED) {
m_a2d_state = APP_AV_STATE_CONNECTING;
ESP_LOGI(BT_AV_TAG, "Device discovery stopped.");
ESP_LOGI(BT_AV_TAG, "a2dp connecting to peer: %s", peer_bdname);
esp_a2d_source_connect(peer_bda);
} else {
// not discovered, continue to discover
ESP_LOGI(BT_AV_TAG, "Device discovery failed, continue to discover...");
esp_bt_gap_start_discovery(ESP_BT_INQ_MODE_GENERAL_INQUIRY, 10, 0);
}
} else if (param->disc_st_chg.state == ESP_BT_GAP_DISCOVERY_STARTED) {
ESP_LOGI(BT_AV_TAG, "Discovery started.");
}
break;
}
case ESP_BT_GAP_RMT_SRVCS_EVT:
case ESP_BT_GAP_RMT_SRVC_REC_EVT:
default: {
ESP_LOGI(BT_AV_TAG, "event: %d", event);
break;
}
}
return;
}
static void bt_av_hdl_stack_evt(uint16_t event, void *p_param)
{
ESP_LOGD(BT_AV_TAG, "%s evt %d", __func__, event);
switch (event) {
case BT_APP_EVT_STACK_UP: {
/* set up device name */
char *dev_name = "ESP_A2DP_SRC";
esp_bt_dev_set_device_name(dev_name);
/* register GAP callback function */
esp_bt_gap_register_callback(bt_app_gap_cb);
/* initialize A2DP source */
esp_a2d_register_callback(&bt_app_a2d_cb);
esp_a2d_source_register_data_callback(bt_app_a2d_data_cb);
esp_a2d_source_init();
/* set discoverable and connectable mode */
esp_bt_gap_set_scan_mode(ESP_BT_SCAN_MODE_CONNECTABLE_DISCOVERABLE);
/* start device discovery */
ESP_LOGI(BT_AV_TAG, "Starting device discovery...");
m_a2d_state = APP_AV_STATE_DISCOVERING;
esp_bt_gap_start_discovery(ESP_BT_INQ_MODE_GENERAL_INQUIRY, 10, 0);
/* create and start heart beat timer */
do {
int tmr_id = 0;
tmr = xTimerCreate("connTmr", (10000 / portTICK_RATE_MS),
pdTRUE, (void *)tmr_id, a2d_app_heart_beat);
xTimerStart(tmr, portMAX_DELAY);
} while (0);
break;
}
default:
ESP_LOGE(BT_AV_TAG, "%s unhandled evt %d", __func__, event);
break;
}
}
static void bt_app_a2d_cb(esp_a2d_cb_event_t event, esp_a2d_cb_param_t *param)
{
bt_app_work_dispatch(bt_app_av_sm_hdlr, event, param, sizeof(esp_a2d_cb_param_t), NULL);
}
static int32_t bt_app_a2d_data_cb(uint8_t *data, int32_t len)
{
if (len < 0 || data == NULL) {
return 0;
}
// generate random sequence
int val = rand() % (1 << 16);
for (int i = 0; i < (len >> 1); i++) {
data[(i << 1)] = val & 0xff;
data[(i << 1) + 1] = (val >> 8) & 0xff;
}
return len;
}
static void a2d_app_heart_beat(void *arg)
{
bt_app_work_dispatch(bt_app_av_sm_hdlr, BT_APP_HEART_BEAT_EVT, NULL, 0, NULL);
}
static void bt_app_av_sm_hdlr(uint16_t event, void *param)
{
ESP_LOGE(BT_AV_TAG, "%s state %d, evt 0x%x", __func__, m_a2d_state, event);
switch (m_a2d_state) {
case APP_AV_STATE_DISCOVERING:
case APP_AV_STATE_DISCOVERED:
break;
case APP_AV_STATE_UNCONNECTED:
bt_app_av_state_unconnected(event, param);
break;
case APP_AV_STATE_CONNECTING:
bt_app_av_state_connecting(event, param);
break;
case APP_AV_STATE_CONNECTED:
bt_app_av_state_connected(event, param);
break;
case APP_AV_STATE_DISCONNECTING:
bt_app_av_state_disconnecting(event, param);
break;
default:
ESP_LOGE(BT_AV_TAG, "%s invalid state %d", __func__, m_a2d_state);
break;
}
}
static void bt_app_av_state_unconnected(uint16_t event, void *param)
{
switch (event) {
case ESP_A2D_CONNECTION_STATE_EVT:
case ESP_A2D_AUDIO_STATE_EVT:
case ESP_A2D_AUDIO_CFG_EVT:
case ESP_A2D_MEDIA_CTRL_ACK_EVT:
break;
case BT_APP_HEART_BEAT_EVT: {
uint8_t *p = peer_bda;
ESP_LOGI(BT_AV_TAG, "a2dp connecting to peer: %02x:%02x:%02x:%02x:%02x:%02x",
p[0], p[1], p[2], p[3], p[4], p[5]);
esp_a2d_source_connect(peer_bda);
m_a2d_state = APP_AV_STATE_CONNECTING;
m_connecting_intv = 0;
break;
}
default:
ESP_LOGE(BT_AV_TAG, "%s unhandled evt %d", __func__, event);
break;
}
}
static void bt_app_av_state_connecting(uint16_t event, void *param)
{
esp_a2d_cb_param_t *a2d = NULL;
switch (event) {
case ESP_A2D_CONNECTION_STATE_EVT: {
a2d = (esp_a2d_cb_param_t *)(param);
if (a2d->conn_stat.state == ESP_A2D_CONNECTION_STATE_CONNECTED) {
ESP_LOGI(BT_AV_TAG, "a2dp connected");
m_a2d_state = APP_AV_STATE_CONNECTED;
m_media_state = APP_AV_MEDIA_STATE_IDLE;
} else if (a2d->conn_stat.state == ESP_A2D_CONNECTION_STATE_DISCONNECTED) {
m_a2d_state = APP_AV_STATE_UNCONNECTED;
}
break;
}
case ESP_A2D_AUDIO_STATE_EVT:
case ESP_A2D_AUDIO_CFG_EVT:
case ESP_A2D_MEDIA_CTRL_ACK_EVT:
break;
case BT_APP_HEART_BEAT_EVT:
if (++m_connecting_intv >= 2) {
m_a2d_state = APP_AV_STATE_UNCONNECTED;
m_connecting_intv = 0;
}
break;
default:
ESP_LOGE(BT_AV_TAG, "%s unhandled evt %d", __func__, event);
break;
}
}
static void bt_app_av_media_proc(uint16_t event, void *param)
{
esp_a2d_cb_param_t *a2d = NULL;
switch (m_media_state) {
case APP_AV_MEDIA_STATE_IDLE: {
if (event == BT_APP_HEART_BEAT_EVT) {
ESP_LOGI(BT_AV_TAG, "a2dp media ready checking ...");
esp_a2d_media_ctrl(ESP_A2D_MEDIA_CTRL_CHECK_SRC_RDY);
} else if (event == ESP_A2D_MEDIA_CTRL_ACK_EVT) {
a2d = (esp_a2d_cb_param_t *)(param);
if (a2d->media_ctrl_stat.cmd == ESP_A2D_MEDIA_CTRL_CHECK_SRC_RDY &&
a2d->media_ctrl_stat.status == ESP_A2D_MEDIA_CTRL_ACK_SUCCESS) {
ESP_LOGI(BT_AV_TAG, "a2dp media ready, starting ...");
esp_a2d_media_ctrl(ESP_A2D_MEDIA_CTRL_START);
m_media_state = APP_AV_MEDIA_STATE_STARTING;
}
}
break;
}
case APP_AV_MEDIA_STATE_STARTING: {
if (event == ESP_A2D_MEDIA_CTRL_ACK_EVT) {
a2d = (esp_a2d_cb_param_t *)(param);
if (a2d->media_ctrl_stat.cmd == ESP_A2D_MEDIA_CTRL_START &&
a2d->media_ctrl_stat.status == ESP_A2D_MEDIA_CTRL_ACK_SUCCESS) {
ESP_LOGI(BT_AV_TAG, "a2dp media start successfully.");
m_intv_cnt = 0;
m_media_state = APP_AV_MEDIA_STATE_STARTED;
} else {
// not started succesfully, transfer to idle state
ESP_LOGI(BT_AV_TAG, "a2dp media start failed.");
m_media_state = APP_AV_MEDIA_STATE_IDLE;
}
}
break;
}
case APP_AV_MEDIA_STATE_STARTED: {
if (event == BT_APP_HEART_BEAT_EVT) {
if (++m_intv_cnt >= 10) {
ESP_LOGI(BT_AV_TAG, "a2dp media stopping...");
esp_a2d_media_ctrl(ESP_A2D_MEDIA_CTRL_STOP);
m_media_state = APP_AV_MEDIA_STATE_STOPPING;
m_intv_cnt = 0;
}
}
break;
}
case APP_AV_MEDIA_STATE_STOPPING: {
if (event == ESP_A2D_MEDIA_CTRL_ACK_EVT) {
a2d = (esp_a2d_cb_param_t *)(param);
if (a2d->media_ctrl_stat.cmd == ESP_A2D_MEDIA_CTRL_STOP &&
a2d->media_ctrl_stat.status == ESP_A2D_MEDIA_CTRL_ACK_SUCCESS) {
ESP_LOGI(BT_AV_TAG, "a2dp media stopped successfully, disconnecting...");
m_media_state = APP_AV_MEDIA_STATE_IDLE;
esp_a2d_source_disconnect(peer_bda);
m_a2d_state = APP_AV_STATE_DISCONNECTING;
} else {
ESP_LOGI(BT_AV_TAG, "a2dp media stopping...");
esp_a2d_media_ctrl(ESP_A2D_MEDIA_CTRL_STOP);
}
}
break;
}
}
}
static void bt_app_av_state_connected(uint16_t event, void *param)
{
esp_a2d_cb_param_t *a2d = NULL;
switch (event) {
case ESP_A2D_CONNECTION_STATE_EVT: {
a2d = (esp_a2d_cb_param_t *)(param);
if (a2d->conn_stat.state == ESP_A2D_CONNECTION_STATE_DISCONNECTED) {
ESP_LOGI(BT_AV_TAG, "a2dp disconnected");
m_a2d_state = APP_AV_STATE_UNCONNECTED;
}
break;
}
case ESP_A2D_AUDIO_STATE_EVT: {
a2d = (esp_a2d_cb_param_t *)(param);
if (ESP_A2D_AUDIO_STATE_STARTED == a2d->audio_stat.state) {
m_pkt_cnt = 0;
}
break;
}
case ESP_A2D_AUDIO_CFG_EVT:
// not suppposed to occur for A2DP source
break;
case ESP_A2D_MEDIA_CTRL_ACK_EVT:
case BT_APP_HEART_BEAT_EVT: {
bt_app_av_media_proc(event, param);
break;
}
default:
ESP_LOGE(BT_AV_TAG, "%s unhandled evt %d", __func__, event);
break;
}
}
static void bt_app_av_state_disconnecting(uint16_t event, void *param)
{
esp_a2d_cb_param_t *a2d = NULL;
switch (event) {
case ESP_A2D_CONNECTION_STATE_EVT: {
a2d = (esp_a2d_cb_param_t *)(param);
if (a2d->conn_stat.state == ESP_A2D_CONNECTION_STATE_DISCONNECTED) {
ESP_LOGI(BT_AV_TAG, "a2dp disconnected");
m_a2d_state = APP_AV_STATE_UNCONNECTED;
}
break;
}
case ESP_A2D_AUDIO_STATE_EVT:
case ESP_A2D_AUDIO_CFG_EVT:
case ESP_A2D_MEDIA_CTRL_ACK_EVT:
case BT_APP_HEART_BEAT_EVT:
break;
default:
ESP_LOGE(BT_AV_TAG, "%s unhandled evt %d", __func__, event);
break;
}
}
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