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Sound_Mode 3 (changes)
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Programmer's SoundDMA Reference Manuals
» Part 15 – SWI Calls
» Sound Sound_Mode
» Sound_Mode 3Sound_Mode
» Sound_Mode 3
Sound_Mode 3
(SWI &40144)
| Entry | |
|---|---|
| R0 | 3 (reason code) |
| R1 | New mono conversion state: |
| 0 → disable mono conversion | |
| Non-zero → convert to mono output |
| Exit | |
|---|---|
| R1 | Previous mono conversion state (0=disabled, 1=enabled) |
Use
This SWI is used to control whether the stereo sound output should be downmixed to mono.
Notes
If mono conversion is enabled, then all sound output (8 bit and 16 bit) will be downmixed to mono. In the current implementation, this conversion is performed in-place – the hardware still receives a stereo data stream, but both left and right samples will be set to identical values.
Sound_Mode 0 can be used to read the mono conversion state without changing it.
See also
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