INCarAudioSource.sourceOpticalDrive An optical drive source such as a CD or DVD. Declarationcase sourceOpticalDrive See AlsoConstantsINCarAudioSource.sourceUnknownINCarAudioSource.sourceCarPlayINCarAudioSource.sourceiPodINCarAudioSource.sourceRadioINCarAudioSource.sourceBluetoothINCarAudioSource.sourceAUXINCarAudioSource.sourceUSBINCarAudioSource.sourceMemoryCardINCarAudioSource.sourceHardDrive