ESP32 作为蓝牙音源

#ESP32 作为蓝牙音源| 来源: 网络整理| 查看: 265

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“JABRA TALK”：

Jabra Talk 蓝牙耳机

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 . */ #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); }

特别注意，因为代码有音频数据需要特别选择 Huge APP 模式：

选择 Huge APP 模式

测试使用的板子是 ESP-WROOM-32，特点是价格偏移兼容性还不错（同样的我试验了 TinkerNode，播放时有卡顿，似乎后台有人一直占用 Soc）：

ESP-WROOM-32 很便宜

蓝牙耳机和 ESP32

测试的视频：

https://www.bilibili.com/video/BV1wa411A7et/

特别注意：连接时需要比较有耐心多次尝试，先将耳机设置为配对模式，然后ESP32上电。从资料来看，这样的搭配似乎有兼容性问题，淘宝上的卖家都不承诺蓝牙音频端能够兼容客户的蓝牙接收端。

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ESP32 作为蓝牙音源

ESP32 作为蓝牙音源

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