# AudioQueueAllocateBufferWithPacketDescriptions(_:_:_:_:) Asks an audio queue object to allocate an audio queue buffer with space for packet descriptions. ``` func AudioQueueAllocateBufferWithPacketDescriptions(_ inAQ: AudioQueueRef, _ inBufferByteSize: UInt32, _ inNumberPacketDescriptions: UInt32, _ outBuffer: UnsafeMutablePointer) -> OSStatus ``` ## Parameters `inAQ` The audio queue you want to allocate a buffer. `inBufferByteSize` The desired data capacity of the new buffer, in bytes. Appropriate capacity depends on the processing you will perform on the data as well as on the audio data format. `inNumberPacketDescriptions` The desired size of the packet description array in the new audio queue buffer. `outBuffer` On output, points to the newly allocated audio queue buffer. ## Return Value A result code. See Result Codes. ## Discussion Use this function when allocating an audio queue buffer for use with a VBR compressed data format. Once allocated, the pointer to the audio queue buffer and the buffer’s capacity cannot be changed. The buffer’s size field, `mAudioDataByteSize`, which indicates the amount of valid data, is initially set to 0. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)