OVMS3-idf/examples/bluetooth/a2dp_sink/main/bt_app_av.c

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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 <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include "esp_log.h"
#include "bt_app_core.h"
#include "bt_app_av.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"
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#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/i2s.h"
/* a2dp event handler */
static void bt_av_hdl_a2d_evt(uint16_t event, void *p_param);
/* avrc event handler */
static void bt_av_hdl_avrc_evt(uint16_t event, void *p_param);
static uint32_t m_pkt_cnt = 0;
static esp_a2d_audio_state_t m_audio_state = ESP_A2D_AUDIO_STATE_STOPPED;
/* callback for A2DP sink */
void bt_app_a2d_cb(esp_a2d_cb_event_t event, esp_a2d_cb_param_t *param)
{
switch (event) {
case ESP_A2D_CONNECTION_STATE_EVT:
case ESP_A2D_AUDIO_STATE_EVT:
case ESP_A2D_AUDIO_CFG_EVT: {
bt_app_work_dispatch(bt_av_hdl_a2d_evt, event, param, sizeof(esp_a2d_cb_param_t), NULL);
break;
}
default:
ESP_LOGE(BT_AV_TAG, "a2dp invalid cb event: %d", event);
break;
}
}
void bt_app_a2d_data_cb(const uint8_t *data, uint32_t len)
{
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i2s_write_bytes(0, (const char *)data, len, portMAX_DELAY);
if (++m_pkt_cnt % 100 == 0) {
ESP_LOGE(BT_AV_TAG, "audio data pkt cnt %u", m_pkt_cnt);
}
}
void bt_app_alloc_meta_buffer(esp_avrc_ct_cb_param_t *param)
{
esp_avrc_ct_cb_param_t *rc = (esp_avrc_ct_cb_param_t *)(param);
uint8_t *attr_text = (uint8_t *) malloc (rc->meta_rsp.attr_length + 1);
memcpy(attr_text, rc->meta_rsp.attr_text, rc->meta_rsp.attr_length);
attr_text[rc->meta_rsp.attr_length] = 0;
rc->meta_rsp.attr_text = attr_text;
}
void bt_app_rc_ct_cb(esp_avrc_ct_cb_event_t event, esp_avrc_ct_cb_param_t *param)
{
switch (event) {
case ESP_AVRC_CT_METADATA_RSP_EVT:
bt_app_alloc_meta_buffer(param);
case ESP_AVRC_CT_CONNECTION_STATE_EVT:
case ESP_AVRC_CT_PASSTHROUGH_RSP_EVT:
case ESP_AVRC_CT_CHANGE_NOTIFY_EVT: {
bt_app_work_dispatch(bt_av_hdl_avrc_evt, event, param, sizeof(esp_avrc_ct_cb_param_t), NULL);
break;
}
default:
ESP_LOGE(BT_AV_TAG, "avrc invalid cb event: %d", event);
break;
}
}
static void bt_av_hdl_a2d_evt(uint16_t event, void *p_param)
{
ESP_LOGD(BT_AV_TAG, "%s evt %d", __func__, event);
esp_a2d_cb_param_t *a2d = NULL;
switch (event) {
case ESP_A2D_CONNECTION_STATE_EVT: {
a2d = (esp_a2d_cb_param_t *)(p_param);
ESP_LOGI(BT_AV_TAG, "a2dp conn_state_cb, state %d", a2d->conn_stat.state);
break;
}
case ESP_A2D_AUDIO_STATE_EVT: {
a2d = (esp_a2d_cb_param_t *)(p_param);
ESP_LOGI(BT_AV_TAG, "a2dp audio_state_cb state %d", a2d->audio_stat.state);
m_audio_state = a2d->audio_stat.state;
if (ESP_A2D_AUDIO_STATE_STARTED == a2d->audio_stat.state) {
m_pkt_cnt = 0;
}
break;
}
case ESP_A2D_AUDIO_CFG_EVT: {
a2d = (esp_a2d_cb_param_t *)(p_param);
ESP_LOGI(BT_AV_TAG, "a2dp audio_cfg_cb , codec type %d", a2d->audio_cfg.mcc.type);
// for now only SBC stream is supported
if (a2d->audio_cfg.mcc.type == ESP_A2D_MCT_SBC) {
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int sample_rate = 16000;
char oct0 = a2d->audio_cfg.mcc.cie.sbc[0];
if (oct0 & (0x01 << 6)) {
sample_rate = 32000;
} else if (oct0 & (0x01 << 5)) {
sample_rate = 44100;
} else if (oct0 & (0x01 << 4)) {
sample_rate = 48000;
}
i2s_set_clk(0, sample_rate, 16, 2);
ESP_LOGI(BT_AV_TAG, "configure audio player %x-%x-%x-%x\n",
a2d->audio_cfg.mcc.cie.sbc[0],
a2d->audio_cfg.mcc.cie.sbc[1],
a2d->audio_cfg.mcc.cie.sbc[2],
a2d->audio_cfg.mcc.cie.sbc[3]);
ESP_LOGI(BT_AV_TAG, "audio player configured, samplerate=%d", sample_rate);
}
break;
}
default:
ESP_LOGE(BT_AV_TAG, "%s unhandled evt %d", __func__, event);
break;
}
}
static void bt_av_new_track()
{
//Register notifications and request metadata
esp_avrc_ct_send_metadata_cmd(0, ESP_AVRC_MD_ATTR_TITLE | ESP_AVRC_MD_ATTR_ARTIST | ESP_AVRC_MD_ATTR_ALBUM | ESP_AVRC_MD_ATTR_GENRE);
esp_avrc_ct_send_register_notification_cmd(1, ESP_AVRC_RN_TRACK_CHANGE, 0);
}
void bt_av_notify_evt_handler(uint8_t event_id, uint32_t event_parameter)
{
switch (event_id) {
case ESP_AVRC_RN_TRACK_CHANGE:
bt_av_new_track();
break;
}
}
static void bt_av_hdl_avrc_evt(uint16_t event, void *p_param)
{
ESP_LOGD(BT_AV_TAG, "%s evt %d", __func__, event);
esp_avrc_ct_cb_param_t *rc = (esp_avrc_ct_cb_param_t *)(p_param);
switch (event) {
case ESP_AVRC_CT_CONNECTION_STATE_EVT: {
uint8_t *bda = rc->conn_stat.remote_bda;
ESP_LOGI(BT_AV_TAG, "avrc conn_state evt: state %d, feature 0x%x, [%02x:%02x:%02x:%02x:%02x:%02x]",
rc->conn_stat.connected, rc->conn_stat.feat_mask, bda[0], bda[1], bda[2], bda[3], bda[4], bda[5]);
if (rc->conn_stat.connected) {
bt_av_new_track();
}
break;
}
case ESP_AVRC_CT_PASSTHROUGH_RSP_EVT: {
ESP_LOGI(BT_AV_TAG, "avrc passthrough rsp: key_code 0x%x, key_state %d", rc->psth_rsp.key_code, rc->psth_rsp.key_state);
break;
}
case ESP_AVRC_CT_METADATA_RSP_EVT: {
ESP_LOGI(BT_AV_TAG, "avrc metadata rsp: attribute id 0x%x, %s", rc->meta_rsp.attr_id, rc->meta_rsp.attr_text);
free(rc->meta_rsp.attr_text);
break;
}
case ESP_AVRC_CT_CHANGE_NOTIFY_EVT: {
ESP_LOGI(BT_AV_TAG, "avrc event notification: %d, param: %d", rc->change_ntf.event_id, rc->change_ntf.event_parameter);
bt_av_notify_evt_handler(rc->change_ntf.event_id, rc->change_ntf.event_parameter);
break;
}
default:
ESP_LOGE(BT_AV_TAG, "%s unhandled evt %d", __func__, event);
break;
}
}