函数 av_samples_copy 

pub unsafe extern "C" fn av_samples_copy(
    dst: *const *mut u8,
    src: *const *mut u8,
    dst_offset: c_int,
    src_offset: c_int,
    nb_samples: c_int,
    nb_channels: c_int,
    sample_fmt: AVSampleFormat,
) -> c_int

Copy samples from src to dst.

@param dst destination array of pointers to data planes @param src source array of pointers to data planes @param dst_offset offset in samples at which the data will be written to dst @param src_offset offset in samples at which the data will be read from src @param nb_samples number of samples to be copied @param nb_channels number of audio channels @param sample_fmt audio sample format