#pragma once

extern "C" {
#include <libswresample/swresample.h>
}

class SwrUtil {
public:
    struct Param {
        int sample_rate;
        int channels;
        AVSampleFormat format;
    } _input, _output;
private:
    SwrContext *_swrCtx = nullptr;
public:
    SwrUtil() : _swrCtx(swr_alloc()) {}
    int init(Param in, Param out) {
        _swrCtx = swr_alloc_set_opts(_swrCtx, 
                                    av_get_default_channel_layout(out.channels),
                                    out.format,
                                    out.sample_rate,
                                    av_get_default_channel_layout(in.channels),
                                    in.format, 
                                    in.sample_rate,
                                    0, nullptr);
        return _swrCtx ? 0 : -1;
    }
    int convert(){}
};