# channelData(_:) Returns read-only access to a specific channel’s data. ``` func channelData(_ index: Int) -> AVReadOnlyAudioPCMBuffer.ChannelData ``` ## Parameters `index` The zero-based channel index. ## Return Value A `ChannelData` enum containing the channel’s sample data. ## Discussion The returned `ChannelData` is tied to the lifetime of this buffer and provides type-safe access to the channel’s sample data. - Example: > Note: Provides access to valid data only (up to `frameLength`). ```swift for channelIndex in 0..