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