#include <stdio.h>
#include <iostream>
#include "Windows.h"
#include "HCNetSDK.h"
using namespace std;

void CALLBACK fVoiceDataCallBack(LONG lVoiceComHandle, char *pRecvDataBuffer, DWORD dwBufSize, BYTE byAudioFlag, void* pUser)
{
        //The audio data here can either be the encoded data sent by the device, or the encoded data locally collected.      
       //Затык происходит именно в этом месте.
        BYTE *RawAudioData;
        RawAudioData = (char *)fopen("P:\\Final\\Sound\\WPB.wav","r"); // файл в формате wave, закодированный согласно мануалу     
        NET_DVR_InitG722Encoder();
        NET_DVR_EncodeG722Frame(NET_DVR_InitG722Encoder(), RawAudioData, pRecvDataBuffer);
        NET_DVR_VoiceComSendData(lVoiceComHandle, pRecvDataBuffer, 80);
}

void main() {

        //---------------------------------------
        //Init device
        NET_DVR_Init();
        //Set connect time and reconnect time
        NET_DVR_SetConnectTime(2000, 1);
        NET_DVR_SetReconnect(10000, true);

        //---------------------------------------
        //Register device
        LONG lUserID;
        NET_DVR_DEVICEINFO_V30 struDeviceInfo;
        lUserID = NET_DVR_Login_V30("192.0.0.64", 8000, "admin", "12345", &struDeviceInfo);
        if (lUserID < 0)
        {
             printf("Login error, %d\n", NET_DVR_GetLastError());
             NET_DVR_Cleanup();     
             return;
        }
          
        //Start voice forward
        LONG lVoiceHanle;
        lVoiceHanle = NET_DVR_StartVoiceCom_MR_V30(lUserID, 1, fVoiceDataCallBack, NULL);
        if (lVoiceHanle < 0)
        {
            printf("NET_DVR_StartVoiceCom_MR_V30 error, %d!\n", NET_DVR_GetLastError());
            NET_DVR_Logout(lUserID);
            NET_DVR_Cleanup();
            return;
        }

        Sleep(5000);  //millisecond
        //Stop voice forward
        if (!NET_DVR_StopVoiceCom(lVoiceHanle))
        {
            printf("NET_DVR_StopVoiceCom error, %d!\n", NET_DVR_GetLastError());
            NET_DVR_Logout(lUserID);
            NET_DVR_Cleanup();
            return;
        }
          
        //Logout device
        NET_DVR_Logout(lUserID);
        //Release sdk resource
        NET_DVR_Cleanup();
        return;
}

http://en.pudn.com/search_db.asp?keyword=hikvision+delphi

http://read.pudn.com/downloads86/sourcecode/middleware/333207/HCDemo/HikVisionSDK.pas__.htm

//Decoding nBitrate = 16000
NET_DVR_API void* __stdcall NET_DVR_InitG722Decoder(int nBitrate = 16000);
NET_DVR_API void __stdcall NET_DVR_ReleaseG722Decoder(void *pDecHandle);
NET_DVR_API BOOL __stdcall NET_DVR_DecodeG722Frame(void *pDecHandle, BYTE* pInBuffer, BYTE* pOutBuffer);
//Encoding
NET_DVR_API void* __stdcall NET_DVR_InitG722Encoder();
NET_DVR_API BOOL __stdcall NET_DVR_EncodeG722Frame(void *pEncodeHandle,BYTE* pInBuffer, BYTE* pOutBuffer);
NET_DVR_API void __stdcall NET_DVR_ReleaseG722Encoder(void *pEncodeHandle);

//Decoding
NET_DVR_API void* __stdcall NET_DVR_InitG726Decoder(void** pDecMoudle);
NET_DVR_API void __stdcall NET_DVR_ReleaseG726Decoder(void *pDecHandle);
NET_DVR_API BOOL __stdcall NET_DVR_DecodeG726Frame(void *pDecMoudle, BYTE* pInBuffer, BYTE* pOutBuffer, BYTE byReset);
//Encoding
NET_DVR_API void* __stdcall NET_DVR_InitG726Encoder(void** pEncMoudle);
NET_DVR_API BOOL __stdcall NET_DVR_EncodeG726Frame(void *pEncMoudle,BYTE* pInBuffer, BYTE* pOutBuffer, BYTE byReset);
NET_DVR_API void __stdcall NET_DVR_ReleaseG726Encoder(void *pEncHandle);
//Control the local preview remotely
NET_DVR_API BOOL __stdcall NET_DVR_ClickKey(LONG lUserID, LONG lKeyIndex);
//Control the manual record remotely
NET_DVR_API BOOL __stdcall NET_DVR_StartDVRRecord(LONG lUserID,LONG lChannel,LONG lRecordType);
NET_DVR_API BOOL __stdcall NET_DVR_StopDVRRecord(LONG lUserID,LONG lChannel);
//Decoding Card

BOOL NET_DVR_GetDVRWorkState_V30(LONG lUserID, LPNET_DVR_WORKSTATE_V30 lpWorkState);