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新版ffmpeg 解码aac 默认output 为 AV_SAMPLE_FMT_FLTP//无法播放，要转格式才能播放----即重采样swr转换格式

通过ffmpeg对acc音频解码后，音频的存储格式为AV_SAMPLE_FMT_FLTP，需要将其转换为AV_SAMPLE_FMT_S16P后，用dsound进行播放。

AV_SAMPLE_FMT_FLTP转AV_SAMPLE_FMT_S16P，参考官网：

写wav文件头//后续只要嫁给你ffmpeg得到的pkt.data写进去就行了

static int write_wav_header(int iBitPerSample,int iChans,   unsigned char ucFormat         ,int iSampleRate,int iTotalSamples,FILE*pFile){
   	unsigned char header[44];	unsigned char* p = header;	unsigned int bytes = (iBitPerSample + 7) / 8;	float data_size = (float)bytes * iTotalSamples;	unsigned long word32; 	*p++ = 'R'; *p++ = 'I'; *p++ = 'F'; *p++ = 'F'; 	word32 = (data_size + (44 - 8) < (float)MAXWAVESIZE) ?		(unsigned long)data_size + (44 - 8)  :  (unsigned long)MAXWAVESIZE;	*p++ = (unsigned char)(word32 >>  0);	*p++ = (unsigned char)(word32 >>  8);	*p++ = (unsigned char)(word32 >> 16);	*p++ = (unsigned char)(word32 >> 24); 	*p++ = 'W'; *p++ = 'A'; *p++ = 'V'; *p++ = 'E'; 	*p++ = 'f'; *p++ = 'm'; *p++ = 't'; *p++ = ' '; 	*p++ = 0x10; *p++ = 0x00; *p++ = 0x00; *p++ = 0x00; 	if (ucFormat == AV_SAMPLE_FMT_FLT)	{
   		*p++ = 0x03; *p++ = 0x00;	} else {
   		*p++ = 0x01; *p++ = 0x00;	} 	*p++ = (unsigned char)(iChans >> 0);	*p++ = (unsigned char)(iChans >> 8); 	word32 = (unsigned long)(iSampleRate + 0.5);	*p++ = (unsigned char)(word32 >>  0);	*p++ = (unsigned char)(word32 >>  8);	*p++ = (unsigned char)(word32 >> 16);	*p++ = (unsigned char)(word32 >> 24); 	word32 = iSampleRate * bytes * iChans;	*p++ = (unsigned char)(word32 >>  0);	*p++ = (unsigned char)(word32 >>  8);	*p++ = (unsigned char)(word32 >> 16);	*p++ = (unsigned char)(word32 >> 24); 	word32 = bytes * iChans;	*p++ = (unsigned char)(word32 >>  0);	*p++ = (unsigned char)(word32 >>  8); 	*p++ = (unsigned char)(iBitPerSample >> 0);	*p++ = (unsigned char)(iBitPerSample >> 8); 	*p++ = 'd'; *p++ = 'a'; *p++ = 't'; *p++ = 'a'; 	word32 = data_size < MAXWAVESIZE ?		(unsigned long)data_size : (unsigned long)MAXWAVESIZE;	*p++ = (unsigned char)(word32 >>  0);	*p++ = (unsigned char)(word32 >>  8);	*p++ = (unsigned char)(word32 >> 16);	*p++ = (unsigned char)(word32 >> 24); 	return fwrite(header, sizeof(header), 1, pFile);}

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