Tag: 空指针

确定核心audioAudioBuffer中的帧数

我正在尝试访问iPhone / iPad上的audio文件的原始数据。 我有下面的代码，这是我需要的path基本开始。 但是，我有一个AudioBuffer后，我很难做什么。 AVAssetReader *assetReader = [AVAssetReader assetReaderWithAsset:urlAsset error:nil]; AVAssetReaderTrackOutput *assetReaderOutput = [AVAssetReaderTrackOutput assetReaderTrackOutputWithTrack:[[urlAsset tracks] objectAtIndex:0] outputSettings:nil]; [assetReader addOutput:assetReaderOutput]; [assetReader startReading]; CMSampleBufferRef ref; NSArray *outputs = assetReader.outputs; AVAssetReaderOutput *output = [outputs objectAtIndex:0]; int y = 0; while (ref = [output copyNextSampleBuffer]) { AudioBufferList audioBufferList; CMBlockBufferRef blockBuffer; CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer(ref, NULL, &audioBufferList, sizeof(audioBufferList), NULL, NULL, 0, […]