LInet::SendSound
#include "ltwrappr.h"
L_INT LInet::SendSound(plRemoteComp, pWaveFormatData, pWaveData, pdwDataSize)
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LInet *plRemoteComp; |
/* instance of a remote computer */ |
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LPWAVEFORMATDATA pWaveFormatData; |
/* pointer to a structure describing the sound format */ |
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LPWAVEDATA pWaveData; |
/* pointer to a structure containing the sound data */ |
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L_SIZE_T *puldwDataSize; |
/* address of a variable to be updated with the size of the data being sent */ |
Sends sound data to a remote computer.
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Parameter |
Description |
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plRemoteComp |
Instance of a remote computer to which sound data will be sent. |
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pWaveFormatData |
Pointer to a structure that describes the sound format. |
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pWaveData |
Pointer to a structure containing the sound data. |
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puldwDataSize |
Pointer to a variable which will be updated with the size of the data that was sent. This parameter is optional. You can pass NULL if you don't need this information. |
Returns
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SUCCESS |
The function was successful. |
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< 1 |
An error occurred. Refer to Return Codes. |
Comments
This function sends the pWaveFormatData structure first, including all the extra bytes needed by the format. It then sends the pWaveData structure, followed by the actual sound data.
A call to LInet::OnSoundReceived will be generated on the remote computer.
The remote end can use pWaveFormatData and pWaveData to save the sound to a file, or to play it (using LMMCapture::StartFeedSound).Since this structure follows the pWaveFormatData structure, use the SIZEOF_WAVEFORMATDATA macro to determine the size of the pWaveFormatData structure and thus the start of the pWaveData structure.
The sound format is sent every time so that it will facilitate handling multiple connections to different computers that are recording sound in different formats.
You must initialize the LEADTOOLS Internet DLL using LInet::StartUp before calling this function.
Required DLLs and Libraries
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LTNET For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
See Also
Example
// This example contains code for both the server and the client program and shows how sound can be captured by the
// client and sent to the server.
// a user defined class derived from LInet should be used to support OnConnectRequest and
// OnSounrReceived callback function
// suppose it was named as LUserInet
// a user defined class derived from LMMCapture should be used to support RecordCallBack function
// suppose it was named as LUserMMcap;
// code on the server side
LUserInet UserServerInet;
LUserMMCapture UserServerMMcap;
UserServerInet.StartUp();
if (UserServerInet.ServerInit(1000) != SUCCESS)
LBase::DisplayError(NULL, TEXT("Error attempting to start the server"));
L_INT LUserInet::OnConnectRequest(LInet L_FAR *plConnection, L_INT nError)
{
L_INT nRet = SUCCESS;
if ( nError != SUCCESS)
return FAILURE;
nRet = AcceptConnect(plConnection);
if (nRet != SUCCESS)
{
LBase::DisplayError(NULL, TEXT("Error in accepting remote computer."));
return nRet;
}
nRet = UserServerMMcap.StopFeedSound ();
return nRet;
}
L_INT LUserInet::OnSoundReceived(LInet L_FAR *plConnection, L_INT nError, LPWAVEFORMATDATA pWaveFormatData, L_UINT32 ulWaveFormatSize, LPWAVEDATA pWaveData)
{
L_INT nRet = SUCCESS;
if ( nError != SUCCESS)
return FAILURE;
nRet = UserServerMMcap.StartFeedSound (NULL, CAP_DEVICE_MAPPER, pWaveFormatData, 0, CAP_FEED_PLAYDATA);
if (nRet != SUCCESS)
{
LBase::DisplayError(NULL, TEXT("Error starting sound."));
return nRet;
}
nRet = UserServerMMcap.FeedSound (pWaveData);
return nRet;
}
// code on the client side
LUserInet UserClientInet;
LUserMMCapture UserClientMMcap;
// connect to LEAD.
if (UserClientInet.Connect("207.238.49.190", 1000) != SUCCESS)
LBase::DisplayError(NULL, TEXT("Error attempting to connect"));
L_INT LUserMMCapture::RecordCallback (LPWAVEDATA pWaveData)
{
L_UINT32 dwTotalSize;
LPWAVEFORMATDATA pWaveFormatData;
L_INT nRet = SUCCESS;
LInet L_FAR *plRemote = NULL;
// Suppose that remote computer was the last one in my list
plRemote = UserClientInet.GetLastItem();
nRet = UserClientInet.SendSound(plRemote, pWaveFormatData, pWaveData, &dwTotalSize);
return nRet;
}
L_INT LUserInet::OnConnect(LInet L_FAR *plConnection, L_INT nError)
{
L_UINT uWaveFormatSize;
LPWAVEFORMATDATA pWaveFormatData;
if (nError != SUCCESS)
return nError;
// start recording in the current default Windows format
// get the format size
UserClientMMcap.GetDefaultAudFormat (NULL, &uWaveFormatSize, NULL, NULL);