https://work.weixin.qq.com/api/doc/90000/90136/90496 提到录音接口，录音的具体格式为何？比如参考小程序API(https://developers.weixin.qq.com/miniprogram/dev/api/media/recorder/RecorderManager.start.html)，对应的采样率、通道数、编码码率、音频格式为何