public static extern libavutil.AVAudioFifo *av_audio_fifo_alloc(libavutil.AVSampleFormat sample_fmt, int channels, int nb_samples);
public static extern libswresample.SwrContext *swr_alloc_set_opts(libswresample.SwrContext * s, long out_ch_layout, libavutil.AVSampleFormat out_sample_fmt, int out_sample_rate, long in_ch_layout, libavutil.AVSampleFormat in_sample_fmt, int in_sample_rate, int log_offset, void *log_ctx);
public static extern sbyte *av_get_sample_fmt_name(libavutil.AVSampleFormat sample_fmt);
public static extern libavutil.AVSampleFormat av_get_alt_sample_fmt(libavutil.AVSampleFormat sample_fmt, int planar);
public static extern int av_samples_copy(ref byte *dst, ref byte *src, int dst_offset, int src_offset, int nb_samples, int nb_channels, libavutil.AVSampleFormat sample_fmt);
public static extern int av_samples_set_silence(ref byte *audio_data, int offset, int nb_samples, int nb_channels, libavutil.AVSampleFormat sample_fmt);
public static extern int av_samples_fill_arrays(ref byte *audio_data, int *linesize, byte *buf, int nb_channels, int nb_samples, libavutil.AVSampleFormat sample_fmt, int align);
public static extern int av_samples_alloc_array_and_samples(ref byte *audio_data, int *linesize, int nb_channels, int nb_samples, libavutil.AVSampleFormat sample_fmt, int align);
public static extern int av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples, libavutil.AVSampleFormat sample_fmt, int align);
public static extern int av_sample_fmt_is_planar(libavutil.AVSampleFormat sample_fmt);
public static extern int av_get_bytes_per_sample(libavutil.AVSampleFormat sample_fmt);
public static extern sbyte *av_get_sample_fmt_string(System.Text.StringBuilder buf, int buf_size, libavutil.AVSampleFormat sample_fmt);
public static extern libavutil.AVSampleFormat av_get_planar_sample_fmt(libavutil.AVSampleFormat sample_fmt);