Specifies the stream's volume.
#include "ilmmixcapsrc.h"
Platform | Syntax |
---|---|
C | HRESULT ILMMixCapSrcStream_put_Volume(pixCapSrcStream, newVal) |
C++ | HRESULT put_Volume(newVal) |
Pointer to an ILMMixCapSrcStream interface.
Value that specifies the stream's volume.
Value | Meaning |
---|---|
S_OK | The function was successful. |
<> S_OK | An error occurred. Refer to the Error Codes or the HRESULT error codes in the DirectShow documentation. |
Volume is expressed as an attenuation level, where 0.0 indicates silence and 1.0 indicates full volume (no attenuation). For each stream, the attenuation level is the product of:
For example, if the master volume is 0.8 and the stream volume is 0.5, the attenuation for that stream is 0.8 × 0.5 = 0.4. Volume levels can exceed 1.0 (positive gain), but the audio engine clips any audio samples that exceed zero decibels.
Use the following formula to convert the volume level to the decibel (dB) scale:
Attenuation (dB) = 20 * log10(Level)
For example, a volume level of 0.50 represents 6.02 dB of attenuation.
To retrieve the stream's volume, call ILMMixCapSrcStream::get_Volume.
Win32, x64.
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