LEADTOOLS Multimedia API Help
| LEADTOOLS Multimedia API Help > LEADTOOLS Multimedia Features > Multimedia Function References > IltmmCapture Interface > IltmmCapture::put_Volume |
The portion of the file holding the audio data. The audio data might be compressed to save disk space. The data has to be decompressed using an audio decompressor before you can play (hear) it.
Software component which decompresses audio. It must be designed to work with ACM or DirectShow. Note that different compression methods require different decompressors. There is no universal decompressor capable of decoding all compressed streams.
#include "ltmm.h"
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C Syntax |
HRESULT IltmmCapture_put_Volume(pCapture, newVal) |
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C++ Syntax |
HRESULT put_Volume(newVal) |
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IltmmCapture *pCapture; |
/* pointer to an interface */ |
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long newVal; |
/* volume */ |
Sets the volume level of the audio stream of the preview output. .
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Parameter |
Description |
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pCapture |
Pointer to an IltmmCapture interface. |
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newVal |
Volume level to set. Possible values range from 10000 to 0. |
Returns
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S_OK |
The function was successful. |
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<> S_OK |
An error occurred. Refer to the Error Codes or the HRESULT error codes in the DirectShow documentation. |
Comments
Full volume is 0, and -10,000 is silence. The scale is logarithmic. Multiply the desired decibel level by 100 to get the proper value for newVal. For example if you want a volume of -100 dB, set newVal to -100 X 100 (that is, -10000) .
This property only applies to the preview output. The audio stream in the captured content is not affected.
Required DLLs and Libraries
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LTMM For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
Win32, x64
See Also
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Elements: |
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Topics: |
Example
For a C example, refer to IltmmCapture::IsPreviewTapSupported Example for C.
For a C++ example, refer to IltmmCapture::IsPreviewTapSupported Example for C++.
