waveHeader.m

// 假设有一个名为 "floatArray" 的 float 数组和 "arrayLength" 表示数组长度

NSString *filePath = @"/path/to/file.wav"; // 指定保存 WAV 文件的路径

// 打开文件用于写入
NSOutputStream *outputStream = [NSOutputStream outputStreamToFileAtPath:filePath append:NO];
[outputStream open];

// 构建 WAV 文件头信息
// WAV 文件头的具体格式请根据需要进行调整，以下示例仅提供基本结构
// 更多关于 WAV 文件格式的信息可以参考相应的规范

// WAV 文件头信息
struct {
    char chunkID[4];
    uint32_t chunkSize;
    char format[4];
    char subchunk1ID[4];
    uint32_t subchunk1Size;
    uint16_t audioFormat;
    uint16_t numChannels;
    uint32_t sampleRate;
    uint32_t byteRate;
    uint16_t blockAlign;
    uint16_t bitsPerSample;
    char subchunk2ID[4];
    uint32_t subchunk2Size;
} wavHeader;

// 填充 WAV 文件头信息
memcpy(wavHeader.chunkID, "RIFF", 4);
wavHeader.chunkSize = sizeof(wavHeader) - 8 + arrayLength * sizeof(float);
memcpy(wavHeader.format, "WAVE", 4);
memcpy(wavHeader.subchunk1ID, "fmt ", 4);
wavHeader.subchunk1Size = 16;
wavHeader.audioFormat = 3; // IEEE float
wavHeader.numChannels = 1; // 单声道
wavHeader.sampleRate = 44100; // 采样率
wavHeader.byteRate = wavHeader.sampleRate * sizeof(float);
wavHeader.blockAlign = sizeof(float);
wavHeader.bitsPerSample = sizeof(float) * 8;
memcpy(wavHeader.subchunk2ID, "data", 4);
wavHeader.subchunk2Size = arrayLength * sizeof(float);

// 写入 WAV 文件头
[outputStream write:(const uint8_t *)&wavHeader maxLength:sizeof(wavHeader)];

// 将 float 数组的内容写入文件
[outputStream write:(const uint8_t *)floatArray maxLength:arrayLength * sizeof(float)];

// 关闭文件写入器
[outputStream close];