Audigy 2 SPDIF rates.

Audigy 2 SPDIF rates.

[James Courtier-Dutton]

I have found some more rates that the Audigy 2 SPDIF can run at:

Using the register 0x76 A_SPDIF_RATE.
00 => 48000
20 => 192000
40 => 96000
80 => 44100
No other rates are possible.

To detect the rate, loop the SPDIF output into an input and look at 
register 0x61 GPSRCS

Detected rate = ( ( GPSRCS & 0xFFFFF ) * 48000 ) / 0x40000
or
Detected rate = ( ( GPSRCS & 0xFFFFF ) * 48000 ) / 262144

The GPSRCS register is only valid if 0x51 != 0xffffffff
0x51 is GPSCS which is the SPDIF status register. containing details 
about non-audio bits etc.

Likewise, 0x50 and 0x60 for the CD SPDIF input.

So, the header file should be changed from:
#define A_SPDIF_SAMPLERATE      0x76            /* Set the sample rate 
of SPDIF output          */
#define A_SPDIF_RATE_MASK       0x000000c0
#define A_SPDIF_48000           0x00000000
#define A_SPDIF_44100           0x00000080
#define A_SPDIF_96000           0x00000040

To:
#define A_SPDIF_SAMPLERATE      0x76            /* Set the sample rate 
of SPDIF output          */
#define A_SPDIF_RATE_MASK       0x000000e0
#define A_SPDIF_48000           0x00000000
#define A_SPDIF_44100           0x00000080
#define A_SPDIF_96000           0x00000040
#define A_SPDIF_192000          0x00000020


James


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