原文地址：[FAQ19288] [Audio Driver]微信语音/录音开始会把按键音录到文件中

[DESCRIPTION]

微信语音/录音，在消息开始的时候会听到一声POP音。
其实是录音的时候把MIC打开时的POP音录进去了。

[SOLUTION]

1. AudioType.h

   #ifndef UPLINK_LOW_LATENCY //no need to drop data
   #define CAPTURE_DROP_MS (120) //drop 120ms record data in carture data normal provider due to hardware pulse
   #else
   #define CAPTURE_DROP_MS (120) //把这个值改为120ms

2. AudioALSACaptureDataProviderNormal.cpp

   status_t AudioALSACaptureDataProviderNormal::open()
   {
   ...
   //改成#if 1要不然CAPTURE_DROP_MS没有作用
   #if 1//ndef UPLINK_LOW_LATENCY //no need to drop data
   #ifdef RECORD_INPUT_24BITS // 24bit record
   mCaptureDropSize = ((mStreamAttributeSource.sample_rate * CAPTURE_DROP_MS << 3) / 1000); //32bit, drop data which get from kernel