Mark McClelland wrote: > - A way to query signal strength (is v4l2_tuner.signal boolean, like > v4l2_input.signal?) and demodulator status (PLL lock, EQU lock, > etc...). Important since ATSC terrestrial reception is so flaky :) Just had a thought on this... since v4l2_input.signal already appears to be boolean, why not make it a bitfield? Rename it to "status", and add some flags like: /* General */ #define V4L2_IN_ST_NO_POWER 0x00000001 /* Attached device is off */ #define V4L2_IN_ST_NO_SIGNAL 0x00000002 #define V4L2_IN_ST_NO_COLOR 0x00000004 /* Analog */ #define V4L2_IN_ST_NO_H_LOCK 0x00000100 /* No horizontal sync lock */ #define V4L2_IN_ST_COLOR_KILL 0x00000200 /* Color killer is active */ /* Digital */ #define V4L2_IN_ST_NO_SYNC 0x00010000 /* No synchronization lock */ #define V4L2_IN_ST_NO_EQU 0x00020000 /* No equalizer lock */ #define V4L2_IN_ST_NO_CARRIER 0x00040000 /* Carrier recovery failed */ /* VCR and set-top box */ #define V4L2_IN_ST_MACROVISION 0x01000000 /* Macrovision detected */ #define V4L2_IN_ST_NO_ACCESS 0x02000000 /* Conditional access denied */ #define V4L2_IN_ST_VTR 0x04000000 /* VTR time constant */ Why are some of them inverted? So that the driver doesn't have to lie about the status in cases where it can't tell one way or the other. Plus, a status of zero would generally mean that everyting is OK. -- Mark McClelland mark@xxxxxxxxxxxxxxxx
