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the TDx_Library
the TDx9_Library
- Description
The TDx_SoundCaptureBuffer::Lock method will return pointers into the capture buffer, allowing the reading or writing of audio data.
The capture buffer should not be locked for long periods as the capture cursor will reach the locked bytes cause configuration dependent audio problems.
If the method call fails, the OnError event will be triggered with one of the following values:
DSERR_INVALIDPARAM
DSERR_INVALIDCALL
- Parameters
ReadCursor
The ReadCursor parameter defines the offset, in bytes, to where the lock is to begin in the buffer.
ReadBytes
The ReadBytes parameter defines the amount, in bytes, of the buffer that is to be locked.
The space that is locked may wrap around to the start of the buffer, which is conceptually circular, in which case the AudioPtr2 parameter of this method will reference the start of the buffer.
Setting DSCBLOCK_ENTIREBUFFER in the Flags parameter of this method will cause this parameter to be ignored.
AudioPtr1
The AudioPtr1 parameter will reference the first block of locked capture buffer if this method returns successfully.
AudioBytes1
The AudioBytes1 parameter references the number of bytes referenced by the AudioPtr1 parameter of this method.
When this value is less than the value in the ReadBytes parameter of this method, it means AudioPtr2 will reference a second block of sound data.
AudioPtr2
The AudioPtr2 parameter will reference the second block of locked capture buffer if this method returns successfully.
When this parameter is NULL it means AudioPtr1 references the entire locked region of the sound buffer and any portion of the area that wraps around will not be locked.
AudioBytes2
The AudioBytes2 parameter references the number of bytes referenced by the AudioPtr2 parameter of this method.
When the AudioPtr2 parameter of this method is set to NULL, this parameter will be 0.
Flags
The Flags parameter defines a flag modifying the lock event.
The described effect applies when the flag is set.
-
DSBLOCK_ENTIREBUFFER
Lock the whole capture buffer.
Setting this flag causes the ReadBytes parameter of this method to be ignored.
- See Also
- Top
TDx_Sound_Library v1.90 Component Reference
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[ TDx_SoundCaptureBuffer::Lock() ] [ next: SaveToFile() ] [ prev: GetStatus() ] public:
virtual bool __fastcall Lock( dword pReadCursor, dword pReadBytes, void** pAudioPtr1, dword* pAudioBytes1, void** pAudioPtr2, dword* pAudioBytes2, dword pFlags );
TDX_SOUNDCAPTUREBUFFER::LOCK()
[ component method ]
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