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[ESP8266/ESP32] ESP32 作为蓝牙音源

前面介绍过 ESP32 作为蓝牙音频接收端（蓝牙音箱），这里介绍它作为蓝牙音频的播放端。

首先需要确定蓝牙接收器的名称，用笔记本电脑连接后，可以再设备管理器中看到，这里我使用的是一款蓝牙耳机，名称是“JABRATALK”:

接下来需要安装 ESP32-A2DP-master 这个库。下面的代码是从这个库的Example中修改而来，代码如下：

/*

  Streaming of sound data with Bluetooth to an other Bluetooth device.

  We provide the complete sound data as a simple c array which

  can be prepared e.g. in the following way

 

  - Open any sound file in Audacity. Make sure that it contains 2 channels

    - Select Tracks -> Resample and select 44100

    - Export -> Export Audio -> Header Raw ; Signed 16 bit PCM

  - Convert to c file e.g. with "xxd -i file_example_WAV_1MG.raw file_example_WAV_1MG.c"

    - add the const qualifier to the array definition. E.g const unsigned char file_example_WAV_1MG_raw[] = {

 

  Copyright (C) 2020 Phil Schatzmann

  This program is free software: you can redistribute it and/or modify

  it under the terms of the GNU General Public License as published by

  the Free Software Foundation, either version 3 of the License, or

  (at your option) any later version.

  This program is distributed in the hope that it will be useful,

  but WITHOUT ANY WARRANTY; without even the implied warranty of

  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License

  along with this program.  If not, see <<a href="http://www.gnu.org/licenses/" target="_blank">http://www.gnu.org/licenses/>.</a>

*/

 

#include "BluetoothA2DPSource.h"

#include "StarWars30.h"

BluetoothA2DPSource a2dp_source;

//SoundData *data = new TwoChannelSoundData((Channels*)StarWars10_raw,StarWars10_raw_len/4);

SoundData *data = new OneChannelSoundData((int16_t*)StarWars30_raw, StarWars30_raw_len/2);

 

void setup() {

  Serial.begin(115200);

  Serial.println("Start");

  a2dp_source.start("JABRA TALK");   

}

 

void loop() {

  if (a2dp_source.isConnected()==true) {

      Serial.println("Connected!");

      if (a2dp_source.hasSoundData()==true) {

          Serial.println("Has sound!");

        }

      else {

          Serial.println("No sound!");

          a2dp_source.writeData(data);  

      } 

    }

    else {

      Serial.println("Not connected!");

    }

  delay(2000); 

}
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