myvtm/Other/libaudions/libaudions.cpp

// libaudions.cpp : Defines the exported functions for the DLL application.
//

#include "stdafx.h"

#include "SpBase.h"
#include "libaudions.h"
#include "signal_processing_library.h"

//默认是10ms的帧长度
#ifndef RVC_NS_AUDIO_FRAME_TIME 
#define RVC_NS_AUDIO_FRAME_TIME 10
#endif


AudioNsImpl::AudioNsImpl()
{
	Dbg("AudioNsImpl construction.");

	m_NsHandle = NULL;
	if (0 == WebRtcNs_Create(&m_NsHandle)){
		Dbg("AudioNsImpl success.");
	}
	m_audio_sample_rate = 16000;
	m_audio_capture_peroid = 20;
	m_ns_policy = 2;
}

AudioNsImpl::~AudioNsImpl()
{
	Dbg("AudioNsImpl Deconstruction.");
	if (NULL != m_NsHandle){
		int iRet = WebRtcNs_Free(m_NsHandle);
		if (0 == iRet){
			Dbg("WebRtcNs Free success.");
		}
	}
}

int AudioNsImpl::SetNsParams(uint32_t uSampleRate, uint32_t uAudioCapturePeroid, int iMode)
{
	int iRet = -1;
	m_audio_sample_rate = uSampleRate;
	m_audio_capture_peroid = uAudioCapturePeroid;
	m_ns_policy = iMode;

	if (0 == WebRtcNs_Init(m_NsHandle, uSampleRate)){
		iRet = WebRtcNs_set_policy(m_NsHandle, iMode);
		if (0 == iRet){
			Dbg("WebRtcNs init and set policy success.");
		}
		else{
			Dbg("WebRtcNs set policy failed.");
		}
	}
	else{
		Dbg("WebRtcNs Init failed.");
	}
	Dbg("audio sample rate is %d, audio frame time is %dms, noise suppression policy is %d.",m_audio_sample_rate, m_audio_capture_peroid, m_ns_policy);

	return iRet;
}


int AudioNsImpl::NsProcess(char* pDst, uint32_t uDstLen, char* pSrc, uint32_t uSrcLen)
{
	int iRet = -1;
	switch(m_audio_sample_rate)
	{
	case 8000:
		iRet = NsProcess8kAudioSampleRate(pDst, uDstLen, pSrc, uSrcLen);
		break;
	case 16000:
		iRet = NsProcess16kAudioSampleRate(pDst, uDstLen, pSrc, uSrcLen);
		break;
	case 32000:
		iRet = NsProcess32kAudioSampleRate(pDst, uDstLen, pSrc, uSrcLen);
		break;
	default:
		Dbg("Rvc_NsProcess not support audio sample rate.");
		break;
	}

	return iRet;
}


//8k采样率，采样间隔20ms，每次传过来音频大小为320字节,10ms缓冲区大小为160字节,WebRtcNs_Process每次处理10ms数据
int AudioNsImpl::NsProcess8kAudioSampleRate(char* pDst, uint32_t uDstLen, char* pSrc, uint32_t uSrcLen)
{
	int iRet = -1;
	if (NULL == pDst || pSrc == NULL){
		return iRet;
	}
	if ((320 == uDstLen) && (320 == uSrcLen)){
		for (int i = 0; i < m_audio_capture_peroid/RVC_NS_AUDIO_FRAME_TIME; i++){
			short shBufferIn[80] = {0};
			short shBufferOut[80] = {0};
			memcpy(shBufferIn, (char*)pSrc+i*80*sizeof(short), sizeof(short)*80);
			if (iRet = WebRtcNs_Process(m_NsHandle ,shBufferIn  ,NULL ,shBufferOut , NULL)){
				Dbg("Noise_Suppression WebRtcNs_Process 8k input err!");
			}
			else{
				memcpy((char*)pDst+i*80*sizeof(short),shBufferOut,80*sizeof(short));
			}
		}
	}

	return iRet;
}


//16k采样率，采样间隔20ms，每次传过来音频大小为640字节，10ms缓冲区大小为320字节,WebRtcNs_Process每次处理10ms数据
int AudioNsImpl::NsProcess16kAudioSampleRate(char* pDst, uint32_t uDstLen, char* pSrc, uint32_t uSrcLen)
{
	int iRet = -1;
	if (NULL == pDst || pSrc == NULL){
		return iRet;
	}
	if ((640 == uDstLen) && (640 == uSrcLen)){
		for (int i = 0; i < m_audio_capture_peroid/RVC_NS_AUDIO_FRAME_TIME; i++){
			short shBufferIn[160] = {0};
			short shBufferOut[160] = {0};
			memcpy(shBufferIn, (char*)pSrc+i*160*sizeof(short), sizeof(short)*160);
			if (iRet = WebRtcNs_Process(m_NsHandle ,shBufferIn  ,NULL ,shBufferOut , NULL)){
				Dbg("Noise_Suppression WebRtcNs_Process 16k input err!");
			}
			else{
				memcpy((char*)pDst+i*160*sizeof(short),shBufferOut,160*sizeof(short));
			}
		}
	}

	return iRet;
}


//32k采样率，采样间隔20ms，每次传过来音频大小为1280字节，10ms缓冲区大小为640字节,WebRtcNs_Process每次处理10ms数据
int AudioNsImpl::NsProcess32kAudioSampleRate(char* pDst, uint32_t uDstLen, char* pSrc, uint32_t uSrcLen)
{
	int iRet = -1;
	if (NULL == pDst || pSrc == NULL){
		return iRet;
	}

	int  filter_state1[6] = {0}, filter_state12[6] = {0};
	int  Synthesis_state1[6] = {0}, Synthesis_state12[6] = {0};

	if ((1280 == uDstLen) && (1280 == uSrcLen)){
		for (int i = 0; i < m_audio_capture_peroid/RVC_NS_AUDIO_FRAME_TIME; i++){
			short shBufferIn[320] = {0};

			short shInL[160]={0},shInH[160]={0};
			short shOutL[160] ={0},shOutH[160] = {0};

			memcpy(shBufferIn, pSrc + i*320*sizeof(short), 320*sizeof(short));
			//首先需要使用滤波函数将音频数据分高低频，以高频和低频的方式传入降噪函数内部
			WebRtcSpl_AnalysisQMF(shBufferIn,320,shInL,shInH,filter_state1,filter_state12);

			//将需要降噪的数据以高频和低频传入对应接口，同时需要注意返回数据也是分高频和低频
			if (iRet == WebRtcNs_Process(m_NsHandle, shInL, shInH, shOutL, shOutH)){
				Dbg("Noise_Suppression WebRtcNs_Process 32k input err!");
			}
			else
			{
				short shBufferOut[320] = {0};
				//如果降噪成功，则根据降噪后高频和低频数据传入滤波接口，然后用将返回的数据写入文件
				WebRtcSpl_SynthesisQMF(shOutL,shOutH,160,shBufferOut,Synthesis_state1,Synthesis_state12);
				memcpy(pDst+i*320*sizeof(short),shBufferOut,320*sizeof(short));
			}
		}
	}

	return iRet;
}

void AudioNsImpl::ReleaseObj()
{
	Dbg("AudioNsImpl ReleaseObj.");
	delete this;
}