如何通过 AVAssetReader 读取音频样本?我找到了使用 AVAssetReader 复制或混合的示例,但这些循环始终由 AVAssetWriter 循环控制。是否可以只创建一个 AVAssetReader 并读取它,获取每个样本并将每个音频样本的 int32 放入数组中?
Thanks.
为了扩展@amrox的答案,您可以从 CMBlockBufferRef 获取 AudioBufferList,例如
CMItemCount numSamplesInBuffer = CMSampleBufferGetNumSamples(buffer);
AudioBufferList audioBufferList;
CMSampleBufferGetAudioBufferListWithRetainedBlockBuffer(
buffer,
NULL,
&audioBufferList,
sizeof(audioBufferList),
NULL,
NULL,
kCMSampleBufferFlag_AudioBufferList_Assure16ByteAlignment,
&buffer
);
for (int bufferCount=0; bufferCount < audioBufferList.mNumberBuffers; bufferCount++) {
SInt16* samples = (SInt16 *)audioBufferList.mBuffers[bufferCount].mData;
for (int i=0; i < numSamplesInBuffer; i++) {
// amplitude for the sample is samples[i], assuming you have linear pcm to start with
}
}
//Release the buffer when done with the samples
//(retained by CMSampleBufferGetAudioBufferListWithRetainedblockBuffer)
CFRelease(buffer);
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