_CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer的未定义符号

Question

我有这个代码,我试图用来捕获音频数据.然而,编译器抱怨CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer

    -(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection {
        AudioBufferList audioBufferList;
        NSMutableData *data= [[NSMutableData alloc] init];
        CMBlockBufferRef blockBuffer;
        CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer(sampleBuffer, NULL, &audioBufferList, sizeof(audioBufferList), NULL, NULL, 0, &blockBuffer);

        for (int y = 0; y < audioBufferList.mNumberBuffers; y++) {
            AudioBuffer audioBuffer = audioBufferList.mBuffers[y];
            Float32 *frame = (Float32*)audioBuffer.mData;

            [data appendBytes:frame length:audioBuffer.mDataByteSize];
        }
    CFRelease(blockBuffer);
    blockBuffer=NULL;
    [data release];
}

错误:

架构armv7的未定义符号:
"_CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer",引用自: - MicCommunicator.o中的[MicCommunicator captureOutput:didOutputSampleBuffer:fromConnection:] ld:未找到架构armv7 clang的符号:错误:链接器命令失败,退出代码为1(使用-v查看调用)

Answer 1

链接器未能找到符号表示包含该符号的库/框架未列为构建目标的依赖项.在Xcode中,选择目标,转到"Build Phases",打开"Link Binary with Libraries"并添加CoreMedia.