解码回调加入static声明，解决符号冲突问题

iOS/QGVAPlayer/QGVAPlayer/Classes/Controllers/Decoders/QGMP4FrameHWDecoder.m

@@ -469,7 +469,7 @@ NSString *const QGMP4HWDErrorDomain = @"QGMP4HWDErrorDomain";
 }
 
 //decode callback
-void didDecompress(void *decompressionOutputRefCon, void *sourceFrameRefCon, OSStatus status, VTDecodeInfoFlags infoFlags, CVImageBufferRef pixelBuffer, CMTime presentationTimeStamp, CMTime presentationDuration ){
+static void didDecompress(void *decompressionOutputRefCon, void *sourceFrameRefCon, OSStatus status, VTDecodeInfoFlags infoFlags, CVImageBufferRef pixelBuffer, CMTime presentationTimeStamp, CMTime presentationDuration ){
     
     CVPixelBufferRef *outputPixelBuffer = (CVPixelBufferRef *)sourceFrameRefCon;
     *outputPixelBuffer = CVPixelBufferRetain(pixelBuffer);