My codd look like this
let samples = UnsafeMutableBufferPointer<Int16>(start:UnsafeMutablePointer(buffer.mData), count: Int(buffer.mDataByteSize)/sizeof(Int16))
While running this code is generating the following error
Cannot invoke initializer for type 'UnsafeMutablePointer<_>' with an argument list of type '(UnsafeMutableRawPointer?)'
buffer.mdata is having raw data. How can I solve this issue. Thanks in advance
Assuming that buffer is a AudioBuffer from the AVFoundation
framework: buffer.mData is a "optional raw pointer"
UnsafeMutableRawPointer?, and in Swift 3 you have to bind
the raw pointer to a typed pointer:
let buffer: AudioBuffer = ...
if let mData = buffer.mData {
let numSamples = Int(buffer.mDataByteSize)/MemoryLayout<Int16>.size
let samples = UnsafeMutableBufferPointer(start: mData.bindMemory(to: Int16.self, capacity: numSamples),
count: numSamples)
// ...
}
See SE-0107 UnsafeRawPointer API for more information about raw pointers.
As per the documentation:
// Creates an UnsafeMutablePointer over the count contiguous Element instances beginning at start.
init(start: UnsafeMutablePointer<Element>?, count: Int)
So
let samples = UnsafeMutableBufferPointer<Int16>(start:UnsafeMutablePointer(buffer.mData), count: Int(buffer.mDataByteSize)/sizeof(Int16))
will be like:
let byteSize = Int16(buffer.mDataByteSize)/sizeOf(Int16)
let buffer:UnsafeMutablePointer<Int16> = buffer.mData.assumingMemoryBound(to: Int16.self)
let samples = UnsafeMutableBufferPointer<Int16>(start:buffer, count:byteSize)
There are different ways to convert UnsafeMutableRawPointer to UnsafeMutablePointer<T>.
One conversion is already given by Martin in above answer, and other is in this example.
mDatadeclaration?