c语言使用谱减法处理wav音频数据例子

好的，以下是一段使用C语言进行谱减法处理wav音频数据的例子代码：

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <math.h>

#define PI 3.14159265358979323846

typedef struct {
    uint16_t formatTag;
    uint16_t channels;
    uint32_t samplesPerSec;
    uint32_t bytesPerSec;
    uint16_t blockAlign;
    uint16_t bitsPerSample;
    uint32_t dataSize;
    uint8_t* data;
} WaveFile;

float hannWindow(int n, int N) {
    return 0.5 * (1 - cos(2 * PI * n / (N - 1)));
}

void stft(float* x, int N, int H, float* X, int M, float* w) {
    int i, j, k;
    float re, im, tmp;

    for (i = 0; i < M; i++) {
        for (j = 0; j < N; j++) {
            k = i * H + j;
            if (k >= (N + (M - 1) * H)) {
                break;
            }
            tmp = x[k] * w[j];
            re = tmp * cos(2 * PI * j / N);
            im = tmp * sin(2 * PI * j / N);
            X[i * (N / 2 + 1) + j] = sqrt(re * re + im * im);
        }
    }
}

void specSubtraction(float* X, int N, int M, float alpha, float beta, float* Y) {
    int i, j;

    for (i = 0; i < M; i++) {
        for (j = 0; j <= N / 2; j++) {
            Y[i * (N / 2 + 1) + j] = fmax(X[i * (N / 2 + 1) + j] - alpha * beta * X[j], 0);
        }
    }
}

void istft(float* X, int N, int H, float* x, int M, float* w) {
    int i, j, k, L;
    float re, im, tmp;

    for (i = 0; i < M; i++) {
        for (j = 0; j < N; j++) {
            k = i * H + j;
            if (k >= (N + (M - 1) * H)) {
                break;
            }
            tmp = X[i * (N / 2 + 1) + j];
            re = tmp * cos(2 * PI * j / N);
            im = tmp * sin(2 * PI * j / N);
            x[k] += re * w[j];
        }
    }

    for (i = 0; i < N; i++) {
        x[i] /= w[i];
    }
}

void readWaveFile(char* fileName, WaveFile* wf) {
    FILE* fp;
    uint32_t readSize;

    fp = fopen(fileName, "rb");
    if (!fp) {
        printf("Failed to open file: %s\n", fileName);
        exit(1);
    }

    fread(&wf->formatTag, 2, 1, fp);
    fread(&wf->channels, 2, 1, fp);
    fread(&wf->samplesPerSec, 4, 1, fp);
    fread(&wf->bytesPerSec, 4, 1, fp);
    fread(&wf->blockAlign, 2, 1, fp);
    fread(&wf->bitsPerSample, 2, 1, fp);

    fseek(fp, 40, SEEK_SET);
    fread(&wf->dataSize, 4, 1, fp);
    wf->data = (uint8_t*)malloc(wf->dataSize);
    fread(wf->data, wf->dataSize, 1, fp);

    fclose(fp);
}

void writeWaveFile(char* fileName, WaveFile wf) {
    FILE* fp;
    uint32_t dataSize;
    uint8_t* data;
    uint16_t bytePerSample;

    bytePerSample = wf.bitsPerSample / 8;
    dataSize = wf.channels * wf.dataSize / bytePerSample;

    data = (uint8_t*)malloc(dataSize);
    memset(data, 0, dataSize);

    if (wf.formatTag == 1) {
        if (wf.bitsPerSample == 8) {
            int8_t* p = (int8_t*)wf.data;
            int16_t* q = (int16_t*)data;
            int i;

            for (i = 0; i < wf.dataSize; i++) {
                *q++ = ((int16_t)(*p++)) << 8;
            }
        } else if (wf.bitsPerSample == 16) {
            memcpy(data, wf.data, wf.dataSize);
        }
    }

    fp = fopen(fileName, "wb");
    if (!fp) {
        printf("Failed to open file: %s\n", fileName);
        exit(1);
    }

    fwrite("RIFF", 4, 1, fp);
    fwrite(&dataSize, 4, 1, fp);
    fwrite("WAVE", 4, 1, fp);
    fwrite("fmt ", 4, 1, fp);
    fwrite("\x10\x00\x00\x00", 4, 1, fp);
    fwrite("\x01\x00", 2, 1, fp);
    fwrite(&wf.channels, 2, 1, fp);
    fwrite(&wf.samplesPerSec, 4, 1, fp);
    fwrite(&wf.bytesPerSec, 4, 1, fp);
    fwrite(&wf.blockAlign, 2, 1, fp);
    fwrite(&wf.bitsPerSample, 2, 1, fp);
    fwrite("data", 4, 1, fp);
    fwrite(&dataSize, 4, 1, fp);
    fwrite(data, dataSize, 1, fp);

    fclose(fp);
    free(data);
}

void freeWaveFile(WaveFile wf) {
    free(wf.data);
}

int main(int argc, char* argv[]) {
    WaveFile wf;
    int N, M, H;
    float* x, * y, * X, * Y, * w;
    float alpha, beta;
    int i;

    if (argc < 2) {
        printf("Usage: %s <input file>\n", argv[0]);
        exit(1);
    }

    readWaveFile(argv[1], &wf);

    N = 256;
    M = wf.dataSize / 2 / (N / 2);
    H = N / 2;
    alpha = 2;
    beta = 0.9;

    x = (float*)calloc(N + (M - 1) * H, sizeof(float));
    memcpy(x, wf.data, wf.dataSize);
    w = (float*)calloc(N, sizeof(float));
    for (i = 0; i < N; i++) {
        w[i] = hannWindow(i, N);
    }
    X = (float*)calloc(M * (N / 2 + 1), sizeof(float));
    Y = (float*)calloc(M * (N / 2 + 1), sizeof(float));

    stft(x, N, H, X, M, w);
    specSubtraction(X, N, M, alpha, beta, Y);
    istft(Y, N, H, x, M, w);

    wf.dataSize = (N + (M - 1) * H) * wf.channels * wf.bitsPerSample / 8;
    memcpy(wf.data, x, wf.dataSize);
    writeWaveFile("output.wav", wf);

    free(x);
    free(w);
    free(X);
    free(Y);
    freeWaveFile(wf);

    return 0;
}

同时需要注意的是，该例子仅供参考，请根据实际情况进行修改和适当调整。