AC97
From OSDev Wiki
|
|
AC'97 is an audio codec standard developed by Intel Architecture Labs in 1997. It defines a set of registers that can be used to control the audio input and output parameters of an audio device. It does not include details concerning how to access these registers, however. The device specific hardware driver must provide access to these registers before they can be used by the system.
Mixer Registers
| Offset (Hex) | Name | Start values |
|---|---|---|
| 00 | Reset | - |
| 02 | Master Volume | 0x8000 |
| 04 | Aux Out Volume | 0x8000 |
| 06 | Mono Volume | 0x8000 |
| 08 | Master Tone | 0x0F0F |
| 0A | PC Beep Volume | 0x0000 |
| 0C | Phone Volume | 0x8008 |
| 0E | Mic Volume | 0x8008 |
| 10 | Line In Volume | 0x8808 |
| 12 | CD Volume | 0x8808 |
| 14 | Video Volume | 0x8808 |
| 16 | Aux In Volume | 0x8808 |
| 18 | PCM Out Volume | 0x8808 |
| 1A | Record Select | 0x0000 |
| 1C | Record Gain | 0x8000 |
| 1E | Record Gain Mic | 0x8000 |
| 20 | General Purpose | 0x0000 |
| 22 | 3D Control | 0x0000 |
