c语言使用fdk_aac库对aac音频解码为pcm

//示例为adts的aac流数据（adts数据可以每一包都可以独立解析不需要拼凑）
//解码数据的采样率同解码前的采样率，如果不满足需求，需要对数据进行重采样

#include <aacdecoder_lib.h>

int m_fd = -1;
int m_fd2 = -1;

void aac2pcm(){
    
    
		HANDLE_AACDECODER decoder = aacDecoder_Open(TT_MP4_ADTS , 1);
	if (!decoder) {
    
    
		printf("Failed to open AAC decoder");			
		return;
	}	
	m_fd = fopen("./send.aac", "rb");
	m_fd2 = fopen("./recv.pcm", "wb");
	unsigned int size=1024;
	unsigned int valid;
	unsigned char* data=(unsigned char*)malloc(size);
	unsigned int decsize=8* 2048 * sizeof(INT_PCM);
	unsigned char* decdata=(unsigned char*)malloc(decsize);
	int frameCnt=0;
	do{
    
    		
		int len = fread(data, 1,size, m_fd);
		valid=len;
		AAC_DECODER_ERROR err=aacDecoder_Fill(decoder, &data, &size, &valid);//往aac内部缓存中填数据
		if (err != AAC_DEC_OK) {
    
    
            printf("Failed to fill AAC decoder: %d\n", err);
            break;
        }
		while(1){
    
     //一定要加循环，一次有可能解码不完导致数据丢失
			err = aacDecoder_DecodeFrame(decoder, (INT_PCM *)decdata,decsize / sizeof(INT_PCM), 0);
			if(err != AAC_DEC_OK){
    
    
				printf("Failed to DecodeFrame: %d\n", err);
				break;
			}
			//获取解码后码流的信息
			CStreamInfo *info = aacDecoder_GetStreamInfo(decoder);
			printf("--------------------frameSize:%d ",info->frameSize );//输出解码数据大小
			printf("-------------------- sampleRate:%d ", info->sampleRate);//输出解码后采样率
			printf("-------------------- numChannels:%d ", info->numChannels);//通道数
			printf("-------------------- aacSampleRate:%d ", info->aacSampleRate);//输入aac数据采样率
			//int flen = convert_16khz_to_8khz(tmp,decdata,info->frameSize*2); 重采样需要可以到其他链接中获取
			fwrite(decdata,info->frameSize*2,1,m_fd2);
			frameCnt++;
		}

	}while(1);
	aacDecoder_Close(decoder);
	if(data)
		free(data);
	if(decdata)
		free(decdata);
	if(m_fd)
		fclose(m_fd);
	if(m_fd2)
		fclose(m_fd2);
}
}