要将 Go 语言中使用的 FFmpeg 链接转换为 WAV 缓冲区，可以使用以下代码示例：

package main

/*
#cgo CFLAGS: -I/usr/local/include
#cgo LDFLAGS: -L/usr/local/lib -lavformat -lavcodec -lswresample

#include <libavformat/avformat.h>
#include <libswresample/swresample.h>

int convertToWav(const char* inputFile, uint8_t** wavBuffer, size_t* bufferSize) {
    av_register_all();

    AVFormatContext *fmtCtx = NULL;
    if (avformat_open_input(&fmtCtx, inputFile, NULL, NULL) != 0)
        return -1;

    if (avformat_find_stream_info(fmtCtx, NULL) < 0)
        return -1;

    int audioStreamIndex = av_find_best_stream(fmtCtx, AVMEDIA_TYPE_AUDIO, -1, -1, NULL, 0);
    if (audioStreamIndex < 0)
        return -1;

    AVCodecParameters *codecParams = fmtCtx->streams[audioStreamIndex]->codecpar;
    AVCodec *decoder = avcodec_find_decoder(codecParams->codec_id);
    if (!decoder)
        return -1;

    AVCodecContext *decCtx = avcodec_alloc_context3(decoder);
    if (!decCtx)
        return -1;

    if (avcodec_parameters_to_context(decCtx, codecParams) < 0)
        return -1;

    if (avcodec_open2(decCtx, decoder, NULL) != 0)
        return -1;

    SwrContext *swrCtx = swr_alloc();
    
	// 输入参数设置
	int in_channel_layout = decCtx->channel_layout;
	int in_sample_rate = decCtx->sample_rate;
	AVSampleFormat in_sample_fmt = decCtx->sample_fmt;

	// 输出参数设置
	int out_channel_layout = AV_CH_LAYOUT_STEREO;
	int out_sample_rate = 44100;
	AVSampleFormat out_sample_fmt = AV_SAMPLE_FMT_S16;

	swr_alloc_set_opts(swrCtx, out_channel_layout, out_sample_fmt, out_sample_rate,
                   in_channel_layout, in_sample_fmt, in_sample_rate, 0, NULL);
	swr_init(swrCtx);

    AVPacket packet;
    av_init_packet(&packet);

    uint8_t *outputBuffer = NULL;
    size_t outputBufferSize = 0;

    while (av_read_frame(fmtCtx, &packet) >= 0) {
        if (packet.stream_index == audioStreamIndex) {
            int ret = avcodec_send_packet(decCtx, &packet);
            if (ret < 0)
                return -1;

            AVFrame *frame = av_frame_alloc();
            while (avcodec_receive_frame(decCtx, frame) == 0) {
                const int MAX_SAMPLES = 8192; // 根据需要设置适当的值

                uint8_t **convertedData;
                av_samples_alloc_array_and_samples(&convertedData, NULL,
                                                   decCtx->channels,
                                                   frame->nb_samples,
                                                   out_sample_fmt,
                                                   0);

                int samplesConverted = swr_convert(swrCtx,
                                                    convertedData,
                                                    frame->nb_samples,
                                                    (const uint8_t **)frame->data,
                                                    frame->nb_samples);

                int dataSize = av_samples_get_buffer_size(NULL,
                                                          decCtx->channels,
                                                          samplesConverted,
                                                          out_sample_fmt,
                                                          1);

                outputBuffer = realloc(outputBuffer, outputBufferSize + dataSize);
                memcpy(outputBuffer + outputBufferSize, convertedData[0], dataSize);
                
                outputBufferSize += dataSize;
                av_freep(&convertedData[0]);
                av_freep(&convertedData);
            }
            av_frame_free(&frame);
        }
        av_packet_unref(&packet);
    }

    *wavBuffer = outputBuffer;
    *bufferSize = outputBufferSize;

    swr_free(&swrCtx);
    avcodec_close(decCtx);
    avformat_close_input(&fmtCtx);

    return 0;
}

void freeWavBuffer(uint8_t* wavBuffer) {
    free(wavBuffer);
}
*/
import "C"
import (
	"fmt"
	"unsafe"
)

func main() {
	inputFile := "/path/to/input.mp4"

	var wavBuffer *C.uint8_t
	var bufferSize C.size_t

	ret := C.convertToWav(C.CString(inputFile), &wavBuffer, &bufferSize)
	if ret < 0 {
		fmt.Println("Failed to convert to WAV")
		return
	}

	defer C.freeWavBuffer(wavBuffer)

	output := make([]byte, bufferSize)
	bufferPtr := unsafe.Pointer(wavBuffer)
	copy(output, (*[1 << 30]byte)(bufferPtr)[:int(bufferSize):int(bufferSize)])

	// 现在可以使用输出缓冲区 `output` 进行后续操作，例如保存到文件或处理音频数据

	fmt.Println("Successfully converted to WAV")
}

请确保已安装 FFmpeg 并将相关的头文件和库链接正确。此示例代码将 MP4 文件转换为 WAV 缓冲区，并使用 Go 语言与 C 代码进行交互以调用 FFmpeg 函数执行转换操作。最后，通过从 wavBuffer 复制数据到 Go 字节切片中，可以访问生成的 WAV 数据。

注意：此示例可能需要根据您的具体需求进行调整。


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