• What Is an Audio Queue?

• Audio Queue Architecture

• Audio Queues for Recording

• Audio Queues for Playback

• Audio Queue Buffers

• The Buffer Queue and Enqueuing

• The Recording Process

• The Playback Process

• Controlling the Playback Process

• The Audio Queue Callback Function

• The Recording Audio Queue Callback Function

• The Playback Audio Queue Callback Function

• Using Codecs and Audio Data Formats

• Audio Queue Control and State

• Audio Queue Parameters

• Define a Custom Structure to Manage State

• Write a Recording Audio Queue Callback

• The Recording Audio Queue Callback Declaration

• Writing an Audio Queue Buffer to Disk

• Enqueuing an Audio Queue Buffer

• A Full Recording Audio Queue Callback

• Write a Function to Derive Recording Audio Queue Buffer Size

• Set a Magic Cookie for an Audio File

• Set Up an Audio Format for Recording

• Create a Recording Audio Queue

• Creating a Recording Audio Queue

• Getting the Full Audio Format from an Audio Queue

• Create an Audio File

• Set an Audio Queue Buffer Size

• Prepare a Set of Audio Queue Buffers

• Record Audio

• Clean Up After Recording

• Define a Custom Structure to Manage State

• Write a Playback Audio Queue Callback

• The Playback Audio Queue Callback Declaration

• Reading From a File into an Audio Queue Buffer

• Enqueuing an Audio Queue Buffer

• Stopping an Audio Queue

• A Full Playback Audio Queue Callback

• Write a Function to Derive Playback Audio Queue Buffer Size

• Open an Audio File for Playback

• Obtaining a CFURL Object for an Audio File

• Opening an Audio File

• Obtaining a File’s Audio Data Format

• Create a Playback Audio Queue

• Set Sizes for a Playback Audio Queue

• Setting Buffer Size and Number of Packets to Read

• Allocating Memory for a Packet Descriptions Array

• Set a Magic Cookie for a Playback Audio Queue

• Allocate and Prime Audio Queue Buffers

• Set an Audio Queue’s Playback Gain

• Start and Run an Audio Queue

• Clean Up After Playing