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Play Audio(10)

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Operation Code is (45h).

The logical block address field specifies the logical block at which the audio play back

operation will begin. If all bytes in the logical block address field are set to FFh, it means

to start at the current optical head location. This feature allows the host to modify the audio

ending address without interrupting the current audio playback operation.

Specifies the number of contiguous logical blocks that will be played. A transfer length

field of zero indicates that no audio operation will occur. This condition will not be

considered an error. Any other value indicates the number of logical blocks that will be

played.

The PLAY AUDIO(10) command requests that the target play audio starting at the specified

logical block address for the specified transfer length. The command function (Immed bit) and

the output of audio signals will be as specified by the settings of the audio control parameters in

the MODE SELECT PAGE CODE E.

The status returning condition depends on the Immed bit of MODE SELECT page code E.  The

Immed bit in MODE SELECT page code E of one requests that this command return the status

byte as soon as the audio playback operation has been started.  The Immed bit in MODE

SELECT page code E of zero requests that this command return the status byte when audio

playback operation is completed, or an error occurs.

If any commands related to audio operations are implemented then the PLAY AUDIO command

will be implemented to allow a method for the initiator to determine if audio operations are

supported.  A target responding to a PLAY AUDIO command which has transfer length of zero

with Check Condition status and setting the sense key to ILLEGAL REQUEST does not support

audio play operations.