Function FREMediaBufferLock 

pub unsafe extern "C" fn FREMediaBufferLock(
    ctx: FREContext,
    mediaBuffer: FREObject,
    pData: *mut FREBytes,
    pWidth: *mut u32,
    pHeight: *mut u32,
    pStride: *mut u32,
    pFormat: *mut u32,
) -> FREResult

Locks a MediaBuffer bitmap and returns information about the data storage.

Note that for every call to FREMediaBufferLock, a corresponding call to FREMediaBufferUnlock must be made. Ideally this would be as swift as possible, as locking a media buffer would impact rendering of any bitmap it contains. The unlock must be called prior to returning from the ANE function call though.

Parameters

• ctx: The FREContext for the native extension instance.
• mediaBuffer: The AS3 MediaBuffer object for which the image data is requested.
• pData: Pointer to a byte pointer that will be set to the internal image data.
• pWidth: Pointer to a value that will be set to the width of the image data.
• pHeight: Pointer to a value that will be set to the height of the image data.
• pStride: Pointer to a value that will be set to the stride i.e. number of bytes between the start of each row on the image.
• pFormat: Pointer to a value that will be set to a format value (for future usage: currently images are ARGB format).

Returns

• FREResult::FRE_OK
• FREResult::FRE_INVALID_ARGUMENT If any parameter is null.
• FREResult::FRE_INVALID_OBJECT If the MediaBuffer object has an incorrect type.
• FREResult::FRE_WRONG_THREAD If called from the wrong thread; at some point this function will be updated to allow multi-thread calling.