获取wave文件的C函数代码

以下是一个获取wave文件的C函数的简单示例：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct {
    char        ChunkID[4];
    unsigned int    ChunkSize;
    char        Format[4];
    char        Subchunk1ID[4];
    unsigned int    Subchunk1Size;
    unsigned short  AudioFormat;
    unsigned short  NumChannels;
    unsigned int    SampleRate;
    unsigned int    ByteRate;
    unsigned short  BlockAlign;
    unsigned short  BitsPerSample;
    char        Subchunk2ID[4];
    unsigned int    Subchunk2Size;
} WAV_HEADER;

int read_wave_file(char* filename, short** data, int* num_samples) {
    FILE* fp = fopen(filename, "rb");
    if (fp == NULL) {
        printf("Error: failed to open file %s\n", filename);
        return -1;
    }

    WAV_HEADER header;
    fread(&header, sizeof(header), 1, fp);

    if (memcmp(header.ChunkID, "RIFF", 4) != 0 ||
        memcmp(header.Format, "WAVE", 4) != 0 ||
        memcmp(header.Subchunk1ID, "fmt ", 4) != 0 ||
        memcmp(header.Subchunk2ID, "data", 4) != 0) {
        printf("Error: invalid wave file format\n");
        fclose(fp);
        return -1;
    }

    *num_samples = header.Subchunk2Size / sizeof(short);
    *data = (short*)malloc(header.Subchunk2Size);
    fread(*data, header.Subchunk2Size, 1, fp);

    fclose(fp);

    return 0;
}

int main() {
    short* data;
    int num_samples;
    int ret = read_wave_file("test.wav", &data, &num_samples);
    if (ret == 0) {
        printf("Number of samples: %d\n", num_samples);
        // Do something with the audio data...
        free(data);
    }
    return 0;
}

该函数首先打开指定的wave文件，并按照wave文件格式读取音频数据。它将音频数据存储在一个short类型的数组中，并返回音频数据的总样本数。函数返回0表示读取成功，返回-1表示读取失败。