img-spdif-in.rst (1901B)
1================================================ 2Imagination Technologies SPDIF Input Controllers 3================================================ 4 5The Imagination Technologies SPDIF Input controller contains the following 6controls: 7 8* name='IEC958 Capture Mask',index=0 9 10This control returns a mask that shows which of the IEC958 status bits 11can be read using the 'IEC958 Capture Default' control. 12 13* name='IEC958 Capture Default',index=0 14 15This control returns the status bits contained within the SPDIF stream that 16is being received. The 'IEC958 Capture Mask' shows which bits can be read 17from this control. 18 19* name='SPDIF In Multi Frequency Acquire',index=0 20* name='SPDIF In Multi Frequency Acquire',index=1 21* name='SPDIF In Multi Frequency Acquire',index=2 22* name='SPDIF In Multi Frequency Acquire',index=3 23 24This control is used to attempt acquisition of up to four different sample 25rates. The active rate can be obtained by reading the 'SPDIF In Lock Frequency' 26control. 27 28When the value of this control is set to {0,0,0,0}, the rate given to hw_params 29will determine the single rate the block will capture. Else, the rate given to 30hw_params will be ignored, and the block will attempt capture for each of the 31four sample rates set here. 32 33If less than four rates are required, the same rate can be specified more than 34once 35 36* name='SPDIF In Lock Frequency',index=0 37 38This control returns the active capture rate, or 0 if a lock has not been 39acquired 40 41* name='SPDIF In Lock TRK',index=0 42 43This control is used to modify the locking/jitter rejection characteristics 44of the block. Larger values increase the locking range, but reduce jitter 45rejection. 46 47* name='SPDIF In Lock Acquire Threshold',index=0 48 49This control is used to change the threshold at which a lock is acquired. 50 51* name='SPDIF In Lock Release Threshold',index=0 52 53This control is used to change the threshold at which a lock is released.