---
title: CMBlockBuffer.CustomBlockAllocator
framework: coremedia
role: symbol
role_heading: Type Alias
path: coremedia/cmblockbuffer/customblockallocator
---

# CMBlockBuffer.CustomBlockAllocator

A type that allocates memory blocks.

## Declaration

```swift
typealias CustomBlockAllocator = (Int) -> UnsafeMutableRawPointer?
```

## See Also

### Modifying a Block Buffer

- [append(length:allocator:range:flags:)](coremedia/cmblockbuffer/append(length:allocator:range:flags:).md)
- [append(buffer:allocator:flags:)](coremedia/cmblockbuffer/append(buffer:allocator:flags:)-28keu.md)
- [append(buffer:allocator:flags:)](coremedia/cmblockbuffer/append(buffer:allocator:flags:)-8fws8.md)
- [append(length:allocator:deallocator:range:flags:)](coremedia/cmblockbuffer/append(length:allocator:deallocator:range:flags:).md)
- [append(buffer:deallocator:flags:)](coremedia/cmblockbuffer/append(buffer:deallocator:flags:)-3bfef.md)
- [append(buffer:deallocator:flags:)](coremedia/cmblockbuffer/append(buffer:deallocator:flags:)-1ibzz.md)
- [CMBlockBuffer.CustomBlockDeallocator](coremedia/cmblockbuffer/customblockdeallocator.md)
- [append(bufferReference:flags:)](coremedia/cmblockbuffer/append(bufferreference:flags:).md)
- [assureBlockMemory()](coremedia/cmblockbuffer/assureblockmemory().md)
- [withUnsafeMutableBytes(atOffset:_:)](coremedia/cmblockbuffer/withunsafemutablebytes(atoffset:_:).md)