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| Imagination Technologies SPDIF Input Controllers |
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| |
| The Imagination Technologies SPDIF Input controller contains the following |
| controls: |
| |
| * name='IEC958 Capture Mask',index=0 |
| |
| This control returns a mask that shows which of the IEC958 status bits |
| can be read using the 'IEC958 Capture Default' control. |
| |
| * name='IEC958 Capture Default',index=0 |
| |
| This control returns the status bits contained within the SPDIF stream that |
| is being received. The 'IEC958 Capture Mask' shows which bits can be read |
| from this control. |
| |
| * name='SPDIF In Multi Frequency Acquire',index=0 |
| * name='SPDIF In Multi Frequency Acquire',index=1 |
| * name='SPDIF In Multi Frequency Acquire',index=2 |
| * name='SPDIF In Multi Frequency Acquire',index=3 |
| |
| This control is used to attempt acquisition of up to four different sample |
| rates. The active rate can be obtained by reading the 'SPDIF In Lock Frequency' |
| control. |
| |
| When the value of this control is set to {0,0,0,0}, the rate given to hw_params |
| will determine the single rate the block will capture. Else, the rate given to |
| hw_params will be ignored, and the block will attempt capture for each of the |
| four sample rates set here. |
| |
| If less than four rates are required, the same rate can be specified more than |
| once |
| |
| * name='SPDIF In Lock Frequency',index=0 |
| |
| This control returns the active capture rate, or 0 if a lock has not been |
| acquired |
| |
| * name='SPDIF In Lock TRK',index=0 |
| |
| This control is used to modify the locking/jitter rejection characteristics |
| of the block. Larger values increase the locking range, but reduce jitter |
| rejection. |
| |
| * name='SPDIF In Lock Acquire Threshold',index=0 |
| |
| This control is used to change the threshold at which a lock is acquired. |
| |
| * name='SPDIF In Lock Release Threshold',index=0 |
| |
| This control is used to change the threshold at which a lock is released. |
