# 音频开发

在RayNeo眼镜上进行音频业务的开发，实现步骤与一般的android平台音频应用开发类似，如果需要调用MIC进行声音的收录，RayNeo眼镜上封装特有的MIC收音模式，在X2跟X3上略有不同：

#### X2支持的收音模式：

每个apk在调用mic的时候，去设置状态通知audioHAL; AudioManager.setparameter("audio\_source=xxxx")；

| 模式                   | 描述                         | 示例                                                    |
| -------------------- | -------------------------- | ----------------------------------------------------- |
| **audio record:**    | **暂未配置**                   | setParameters("audio\_source\_record=sound")          |
| **camera record:**   | **调用镜腿2颗mic，声音全收进来，无降噪算法** | setParameters("audio\_source\_record=camcorder")      |
| **translation:**     | **调用3颗麦克风，不收佩戴者声音，收外部声音**  | setParameters("audio\_source\_record=translation")    |
| **voice assistant:** | **调用镜腿2颗mic，主要收佩戴者声音**     | setParameters("audio\_source\_record=voiceassistant") |

**为了确保各个应用都有自己的mic组合，请在退出record的时候，也设置下**<mark style="color:$danger;">**setParameters("audio\_source\_record=off");**</mark>

#### X3支持的收音模式：

| 模式                   | 前置条件(AudioRecord)                                                                         | setParameters                                           | 描述                                          |
| -------------------- | ----------------------------------------------------------------------------------------- | ------------------------------------------------------- | ------------------------------------------- |
| OFF                  | 退出录音                                                                                      | audioManager.setParameters("audio\_source\_record=off") | apk退出时记得释放麦克风，退出record的时候需要设置               |
| RECORD\_TRANSLATION  | <p>device.id == SPEAKER\_MIC ;CHANNEL\_IN\_MONO;<br>送翻译引擎的采样率一般设置16k;</p>                 | ExampleRecordTranslation.java                           | 调用前麦克风，录制周围人声，适合会议记录/现场翻译                   |
| CAMCORDER            | <p>device.id == SPEAKER\_MIC;<br>CHANNEL\_IN\_STEREO;<br>采样率根据需要设定，最高不超出48kHz;</p>        | ExampleRecordCamcorder.java                             | 左右镜腿麦克风，立体声录音，全向收音，适合录像场景使用                 |
| VOICE\_RECOGNITION   | <p>device.id == SPEAKER\_MIC;<br>CHANNEL\_IN\_MONO;<br>识别引擎一般要求Sample rate为16kHz，单通道;</p> | ExampleRecordRecognition.java                           | 调用三颗麦克风，只收佩戴者声音，送识别引擎识别，不考虑音质，适合于语音助手，导航场景等 |
| VOICE\_COMMUNICATION | device.id == SPEAKER\_MIC                                                                 | ExampleRecordCommunication.java                         | 调用前麦和右方麦克风，只收佩戴者的声音，适用于网络通话、网络会议等           |

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