读取wav文件头

读取wav文件头

void ReadWaveHead(char *file)
{
	uchar temp = 0;
	uint8 read_bytes = 0;
	char *channel_mappings[] = {NULL,"mono","stereo"};
	uint32 total_time = 0;
	struct PlayTime        //播放时间
	{
		uint8 hour;
		uint8 minute;
		uint8 second;
	} play_time;

	if(NULL == (wave.fp=fopen(file, "rb")))                               /* open file */
	{
		printf("file %s open failure!\n", file);	
	}

	/* read heade information */
	if(1 != fread(wave.header.riff, sizeof(uint8), 1, wave.fp))           /* RIFF chunk */
	{
		printf("read riff error!\n");
		return;
	}
	if(1 != fread(&wave.header.size, sizeof(uint32), 1, wave.fp))         /* SIZE : from here to file end */
	{
		printf("read size error!\n");
		return;
	}
	if(1 != fread(wave.header.wave_flag, sizeof(uint8), 1, wave.fp))      /* wave file flag */
	{
		printf("read wave_flag error!\n");
		return;
	}
	if(1 != fread(wave.header.fmt, sizeof(uint8), 1, wave.fp))             /* fmt chunk */
	{
		printf("read fmt error!\n");
		return;
	}
	if(1 != fread(&wave.header.fmt_len, sizeof(uint32), 1, wave.fp))       /* fmt length */
	{
		printf("read fmt_len error!\n");
		return;
	}
	if(1 != fread(&wave.header.tag, sizeof(uint16), 1, wave.fp))           /* tag : PCM or not */
	{
		printf("read tag error!\n");
		return;
	}
	if(1 != fread(&wave.header.channels, sizeof(uint16), 1, wave.fp))      /* channels */
	{
		printf("read channels error!\n");
		return;
	}
	if(1 != fread(&wave.header.samp_freq, sizeof(uint32), 1, wave.fp))      /* samp_freq */
	{
		printf("read samp_freq error!\n");
		return;
	}
	if(1 != fread(&wave.header.byte_rate, sizeof(uint32), 1, wave.fp))      /* byte_rate : decode how many bytes per second */
	{                                                                       /* byte_rate = samp_freq * bit_samp */
		printf("read byte_rate error!\n");
		return;
	}
	if(1 != fread(&wave.header.block_align, sizeof(uint16), 1, wave.fp))       /* quantize bytes for per samp point */
	{
		printf("read byte_samp error!\n");
		return;
	}
	if(1 != fread(&wave.header.bit_samp, sizeof(uint16), 1, wave.fp))        /* quantize bits for per samp point */
	{                                                                        /* bit_samp = byte_samp * 8 */
		printf("read bit_samp error!\n");
		return;
	}

 /* jump to "data" for reading data */

	if(1 != fread(&wave.data_flag[0], sizeof(uint8), 1, wave.fp))                 /* data chunk */
	{
		printf("read header data error!\n");
		return;
	}
	if(1 != fread(&wave.length, sizeof(uint32), 1, wave.fp))                  /* data length */
	{
		printf("read length error!\n");
	}

	/* jduge data chunk flag */
	total_time = wave.length / wave.header.byte_rate;
	play_time.hour = (uint8)(total_time / 3600);
	play_time.minute = (uint8)((total_time / 60) % 60);
	play_time.second = (uint8)(total_time % 60);
	/* printf file header information */
	printf("%s %ldHz %dbit, DataLen: %ld, Rate: %ld, Length: %2ld:%2ld:%2ld\n",
		   channel_mappings[wave.header.channels],             //声道
		   wave.header.samp_freq,                              //采样频率
		   wave.header.bit_samp,                               //每个采样点的量化位数
           wave.length,
		   wave.header.byte_rate,
		   play_time.hour,play_time.minute,play_time.second);



	//fclose(wave.fp);                                               /* close wave file */
}