修复‘滴滴’杂音

Change-Id: Ib6712374ce74758e48f47b38ba66c7dee6ec0fe5
(cherry picked from commit eb39e7c)

Author: tonychanchen

Source/SDK/LinkVideo/FLV/TIoTPCMXEchoRecord.mm

@@ -7,9 +7,6 @@
 
 #import <AudioUnit/AudioUnit.h>
 
-static int kOutputBus = 0;
-static int kInputBus = 1;
-
 @interface TIoTPCMXEchoRecord()
 {
     AudioUnit audioUnit;
@@ -54,22 +51,12 @@ - (instancetype)initWithChannel:(int)channel isEcho:(BOOL)isEcho
     outStreamDes.mReserved = 0;
     _pcmStreamDescription = outStreamDes;
 
-    UInt32 enableOutput = 1;
-    ret = AudioUnitSetProperty(audioUnit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Output, kOutputBus, &enableOutput, sizeof(enableOutput));
+    UInt32 flags = 1;
+    ret = AudioUnitSetProperty(audioUnit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Input, 1, &flags, sizeof(flags));
     if (ret != noErr)
         return nil;
 
-    ret = AudioUnitSetProperty(audioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, kInputBus, &outStreamDes, sizeof(outStreamDes));
-    if (ret != noErr)
-        return nil;
-    
-    ret = AudioUnitSetProperty(audioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, kOutputBus, &outStreamDes, sizeof(outStreamDes));
-    if (ret != noErr)
-        return nil;
-    
-    // Enable the microphone input
-    UInt32 enableInput = 1;
-    ret = AudioUnitSetProperty(audioUnit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Input, kInputBus, &enableInput, sizeof(enableInput));
+    ret = AudioUnitSetProperty(audioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 1, &outStreamDes, sizeof(outStreamDes));
     if (ret != noErr)
         return nil;
 
@@ -87,9 +74,8 @@ - (instancetype)initWithChannel:(int)channel isEcho:(BOOL)isEcho
     if (ret != noErr)
         return nil;
 
-    AudioUnitInitialize(audioUnit);
-    
-    return self;}
+    return self;
+}
 
 #define kTVURecoderPCMMaxBuffSize 2048
 static int          pcm_buffer_size = 0;