The audio control parameters page sets the playback modes and output controls for subsequent PLAY AUDIO commands and any current audio playback operation. (See the table below.)
┌──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┐ │ Bit │ 7 │ 6 │ 5 │ 4 │ 3 │ 2 │ 1 │ 0 │ │ Byte │ │ │ │ │ │ │ │ │ ├──────┼──────┴──────┼──────┴──────┴──────┴──────┴──────┴──────┤ │ 0 │ Reserved │ Page Code (0Eh) │ ├──────┼─────────────┴─────────────────────────────────────────┤ │ 1 │ Parameter Length (0Eh) │ ├──────┼──────────────────────────────────┬──────┬─────────────┤ │ 2 │ Reserved │Immed │ Reserved │ │ │ │ (1) │ │ ├──────┼──────────────────────────────────┴──────┴─────────────┤ │ 3-7 │ Reserved │ ├──────┼───────────────────────────┬───────────────────────────┤ │ 8 │ Reserved │ Output Port 0 Channel │ │ │ │ Selection │ ├──────┼───────────────────────────┴───────────────────────────┤ │ 9 │ Output Port 0 Volume │ ├──────┼───────────────────────────┬───────────────────────────┤ │ 10 │ Reserved │ Output Port 1 Channel │ │ │ │ Selection │ ├──────┼───────────────────────────┴───────────────────────────┤ │ 11 │ Output Port 1 Volume │ ├──────┼───────────────────────────┬───────────────────────────┤ │ 12 │ Reserved │ Output Port 2 Channel │ │ │ │ Selection (0) │ ├──────┼───────────────────────────┴───────────────────────────┤ │ 13 │ Output Port 2 Volume (0) │ ├──────┼───────────────────────────┬───────────────────────────┤ │ 14 │ Reserved │ Output Port 3 Channel │ │ │ │ Selection (0) │ ├──────┼───────────────────────────┴───────────────────────────┤ │ 15 │ Output Port 3 Volume (0) │ └──────┴───────────────────────────────────────────────────────┘
The immediate bit (Immed) is set to 1 to indicate the target shall send completion status as soon as the playback operation has been started.
The Output Port channel selection specifies the audio channels from the disc to which this output port should be connected, as shown in the table below.
┌───────────────┬─────────────────────────────────────────────┐ │Channel │Function │ │Selection │ │ ├───────────────┼─────────────────────────────────────────────┤ │00h │Output port muted. │ ├───────────────┼─────────────────────────────────────────────┤ │01h │Connect audio channel 0 (left) to this output│ │ │port │ ├───────────────┼─────────────────────────────────────────────┤ │02h │Connect audio channel 1 (right) to this │ │ │output port │ ├───────────────┼─────────────────────────────────────────────┤ │03h │Connect audio channel 0 and 1 to this output │ │ │port │ ├───────────────┼─────────────────────────────────────────────┤ │04h-0Fh │Not supported │ └───────────────┴─────────────────────────────────────────────┘
The channel volume control indicates the relative volume level for this audio output port. Values between 0x00 and 0xFF and allowed. A volume level of zero indicates the output is muted, a value of 0xFF indicates maximum volume level.
The Output Port 2 and Output Port 3 channel selection and volume fields (bytes 12 to 15) are reserved and are set to 0.