extern static VTStatus VTDecompressionSessionCreate(
/* CFAllocatorRef */ IntPtr allocator, // can be null
/* CMVideoFormatDescriptionRef */ IntPtr videoFormatDescription,
/* CFDictionaryRef */ IntPtr videoDecoderSpecification, // can be null
/* CFDictionaryRef */ IntPtr destinationImageBufferAttributes, // can be null
/* const VTDecompressionOutputCallbackRecord* */ ref VTDecompressionOutputCallbackRecord outputCallback,
/* VTDecompressionSessionRef* */ out IntPtr decompressionSessionOut);
static VTDecompressionSession Create(VTDecompressionOutputCallback outputCallback,
CMVideoFormatDescription formatDescription,
VTVideoDecoderSpecification decoderSpecification, // hardware acceleration is default behavior on iOS. no opt-in required.
NSDictionary destinationImageBufferAttributes,
DecompressionOutputCallback cback)
{
if (formatDescription == null)
{
throw new ArgumentNullException("formatDescription");
}
var callbackHandle = GCHandle.Alloc(outputCallback);
var callbackStruct = new VTDecompressionOutputCallbackRecord()
{
Proc = cback,
DecompressionOutputRefCon = GCHandle.ToIntPtr(callbackHandle)
};
IntPtr ret;
var result = VTDecompressionSessionCreate(IntPtr.Zero, formatDescription.Handle,
decoderSpecification != null ? decoderSpecification.Dictionary.Handle : IntPtr.Zero,
destinationImageBufferAttributes != null ? destinationImageBufferAttributes.Handle : IntPtr.Zero,
ref callbackStruct,
out ret);
if (result == VTStatus.Ok && ret != IntPtr.Zero)
{
return new VTDecompressionSession(ret, true)
{
callbackHandle = callbackHandle
}
}
;
callbackHandle.Free();
return(null);
}
static VTDecompressionSession Create (VTDecompressionOutputCallback outputCallback,
CMVideoFormatDescription formatDescription,
VTVideoDecoderSpecification decoderSpecification, // hardware acceleration is default behavior on iOS. no opt-in required.
NSDictionary destinationImageBufferAttributes,
DecompressionOutputCallback cback)
{
if (formatDescription == null)
throw new ArgumentNullException ("formatDescription");
var callbackHandle = GCHandle.Alloc (outputCallback);
var callbackStruct = new VTDecompressionOutputCallbackRecord () {
Proc = cback,
DecompressionOutputRefCon = GCHandle.ToIntPtr (callbackHandle)
};
IntPtr ret;
var result = VTDecompressionSessionCreate (IntPtr.Zero, formatDescription.Handle,
decoderSpecification != null ? decoderSpecification.Dictionary.Handle : IntPtr.Zero,
destinationImageBufferAttributes != null ? destinationImageBufferAttributes.Handle : IntPtr.Zero,
ref callbackStruct,
out ret);
if (result == VTStatus.Ok && ret != IntPtr.Zero)
return new VTDecompressionSession (ret, true) {
callbackHandle = callbackHandle
};
callbackHandle.Free ();
return null;
}
extern static VTStatus VTDecompressionSessionCreate ( /* CFAllocatorRef */ IntPtr allocator, // can be null /* CMVideoFormatDescriptionRef */ IntPtr videoFormatDescription, /* CFDictionaryRef */ IntPtr videoDecoderSpecification, // can be null /* CFDictionaryRef */ IntPtr destinationImageBufferAttributes, // can be null /* const VTDecompressionOutputCallbackRecord* */ ref VTDecompressionOutputCallbackRecord outputCallback, /* VTDecompressionSessionRef* */ out IntPtr decompressionSessionOut);
