PCM转WAV

最新推荐文章于 2024-10-21 19:03:54 发布

ruofengtianxia

最新推荐文章于 2024-10-21 19:03:54 发布

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分类专栏：音频文章标签：音频 pcm转wav

本文链接：https://blog.youkuaiyun.com/ruofengtianxia/article/details/86700747

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本文详细介绍了PCM（脉冲编码调制）文件如何转换为WAV格式的过程，包括PCM数据的解析、WAV文件头的构造以及转换步骤。通过对音频采样率、位深度等参数的处理，揭示了音频格式转换的原理，并提供了相关的代码示例。

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#include <iostream>

using namespace std;

typedef struct WAVE_HEADER {
	//RIFF
	char chunkID[4];
	//long int 4字节 某个大小
	unsigned long chunkSize;
	//WAVE
	char formate[4];
};
typedef struct WAVE_FMT {
	//fmt 注意最后有个空格
	char subchunk1ID[4];
	unsigned long subchunk1Size;
	unsigned short audioFormatTag;
	unsigned short numChannels;
	unsigned long sampleRate;
	unsigned long byteRate;
	unsigned short blockAlign;
	unsigned short bitPerSample;

};
typedef struct WAVE_DATA {
	char subchunk2Id[4];
	unsigned long subchunk2Size;
};

long getFileSize(char* filename) {
	FILE *fp = fopen(filename, "r");
	if (!fp) return -1;
	fseek(fp, 0, SEEK_END);
	long size = ftell(fp);
	fclose(fp);
	return size;
}

int converToWAV(const char *pcmpath, int channels, int sample_rate, const char *wavepath) {
	int bits = 16;
	WAVE_HEADER   pcmHEADER;
	WAVE_FMT   pcmFMT;
	WAVE_DATA   pcmDATA;
	FILE *fp, *fpout;

	fp = fopen(pcmpath, "rb");
	if (NULL == fp) {
		std::cout << "file open failed" << endl;
		return -1;
	}
	long pcmSize = getFileSize((char*)pcmpath);
	//WAVE_HEADER
	memcpy(pcmHEADER.chunkID, "RIFF", strlen("RIFF"));
	pcmHEADER.chunkSize = 36 + pcmSize;
	memcpy(pcmHEADER.formate, "WAVE", strlen("WAVE"));


	fpout = fopen(wavepath, "wb");
	if (NULL == fpout) {
		cout << "file open failed" << endl;
		return -1;
	}
	fwrite(&pcmHEADER, sizeof(pcmHEADER), 1, fpout);



	//WAVE_FMT

	pcmFMT.numChannels = channels;
	pcmFMT.sampleRate = sample_rate;
	pcmFMT.bitPerSample = bits;
	pcmFMT.byteRate = sample_rate*channels *pcmFMT.bitPerSample / 8;
	memcpy(pcmFMT.subchunk1ID, "fmt ", strlen("fmt "));
	pcmFMT.subchunk1Size = 16;
	pcmFMT.audioFormatTag = 1;
	pcmFMT.blockAlign = channels*pcmFMT.bitPerSample / 8;
	fwrite(&pcmFMT, sizeof(pcmFMT), 1, fpout);

	//WAVE_DATA
	memcpy(pcmDATA.subchunk2Id, "data", strlen("data"));
	pcmDATA.subchunk2Size = pcmSize;
	fwrite(&pcmDATA, sizeof(pcmDATA), 1, fpout);
	char *buff = (char*)malloc(512);
	int len;
	while ((len = fread(buff, sizeof(char), 512, fp)) != 0)
	{
		fwrite(buff, sizeof(char), len, fpout);
	}
	free(buff);
	fclose(fp);
	fclose(fpout);


}



int main()
{

	converToWAV("D://pwm.data", 2, 48000, "D://output.wav");
	return 0;
}