@see enum AVSampleFormat
The documentation for AVSampleFormat describes the data layout.
@param af AVAudioFifo to read from
@param data audio data plane pointers
@param nb_samples number of samples to peek
@return number of samples actually peek, or negative AVERROR code
on failure. The number of samples actually peek will not
be greater than nb_samples, and will only be less than
nb_samples if av_audio_fifo_size is less than nb_samples.
Peek data from an AVAudioFifo.
@see enum AVSampleFormat The documentation for AVSampleFormat describes the data layout.
@param af AVAudioFifo to read from @param data audio data plane pointers @param nb_samples number of samples to peek @return number of samples actually peek, or negative AVERROR code on failure. The number of samples actually peek will not be greater than nb_samples, and will only be less than nb_samples if av_audio_fifo_size is less than nb_samples.