diff options
Diffstat (limited to 'drivers/media/video/cx18/cx18-av-core.h')
| -rw-r--r-- | drivers/media/video/cx18/cx18-av-core.h | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/media/video/cx18/cx18-av-core.h b/drivers/media/video/cx18/cx18-av-core.h index cf68a6039091..d83760cae540 100644 --- a/drivers/media/video/cx18/cx18-av-core.h +++ b/drivers/media/video/cx18/cx18-av-core.h @@ -79,11 +79,28 @@ struct cx18_av_state { enum cx18_av_audio_input aud_input; u32 audclk_freq; int audmode; - int vbi_line_offset; int default_volume; u32 id; u32 rev; int is_initialized; + + /* + * The VBI slicer starts operating and counting lines, begining at + * slicer line count of 1, at D lines after the deassertion of VRESET + * This staring field line, S, is 6 or 10 for 625 or 525 line systems. + * Sliced ancillary data captured on VBI slicer line M is sent at the + * beginning of the next VBI slicer line, VBI slicer line count N = M+1. + * Thus when the VBI slicer reports a VBI slicer line number with + * ancillary data, the IDID0 byte indicates VBI slicer line N. + * The actual field line that the captured data comes from is + * L = M+(S+D-1) = N-1+(S+D-1) = N + (S+D-2). + * + * D is the slicer_line_delay value programmed into register 0x47f. + * (S+D-2) is the slicer_line_offset used to convert slicer reported + * line counts to actual field lines. + */ + int slicer_line_delay; + int slicer_line_offset; }; |
