无法使用'void * const *'类型的右值初始化'void *'类型的变量

Question

我试图在iOS的核心音频中部分提交缓冲区，为了做到这一点，我需要更改传递给memcpy的起始地址。我的代码看起来像这样......

UInt32 bytesToRead = inBuffer->mAudioDataBytesCapacity;
int srcOffset = 0;
while (bytesToRead > 0) {
    UInt32 maxBytesFromCurrentPiece = self.currentAudioPiece.audioData.length - self.currentAudioPieceIndex;
    //Take the min of what the current piece can provide OR what is needed to be read
    UInt32 bytesToReadNow = MIN(maxBytesFromCurrentPiece, bytesToRead);

    NSData *subRange = [self.currentAudioPiece.audioData subdataWithRange:NSMakeRange(self.currentAudioPieceIndex, bytesToReadNow)];
    //Copy what you can before continuing loop

    void *srcStart = (&inBuffer->mAudioData + srcOffset);
    memcpy(srcStart, subRange.bytes, subRange.length);
    srcOffset += subRange.length;
    bytesToRead -= bytesToReadNow;

Appcode没有显示错误，但编译器显示：

  

＆＃34;语义问题＆＃34; - 无法初始化类型变量＆＃39; void *＆＃39;同   类型＆＃39; void * const *＆＃39;

的右值

与＆＃34; * srcStart＆＃34;。

一致

Answer 1

尝试更改

void *srcStart = (&inBuffer->mAudioData + srcOffset);

到

char *srcStart = ((char *)inBuffer->mAudioData) + srcOffset;

这将跳过适当的字节数。