diff options
Diffstat (limited to 'linux/drivers/media/video/cx18/cx18-driver.c')
| -rw-r--r-- | linux/drivers/media/video/cx18/cx18-driver.c | 49 |
1 files changed, 42 insertions, 7 deletions
diff --git a/linux/drivers/media/video/cx18/cx18-driver.c b/linux/drivers/media/video/cx18/cx18-driver.c index 6f1654945..cea4735b6 100644 --- a/linux/drivers/media/video/cx18/cx18-driver.c +++ b/linux/drivers/media/video/cx18/cx18-driver.c @@ -601,13 +601,47 @@ static int __devinit cx18_init_struct1(struct cx18 *cx) /* VBI */ cx->vbi.in.type = V4L2_BUF_TYPE_VBI_CAPTURE; cx->vbi.sliced_in = &cx->vbi.in.fmt.sliced; - cx->vbi.raw_size = 1456; - cx->vbi.raw_decoder_line_size = 1456; - cx->vbi.raw_decoder_sav_odd_field = 0x20; - cx->vbi.raw_decoder_sav_even_field = 0x60; - cx->vbi.sliced_decoder_line_size = 272; - cx->vbi.sliced_decoder_sav_odd_field = 0xB0; - cx->vbi.sliced_decoder_sav_even_field = 0xF0; + + /* + * The VBI line sizes depend on the pixel clock and the horiz rate + * + * (1/Fh)*(2*Fp) = Samples/line + * = 4 bytes EAV + Anc data in hblank + 4 bytes SAV + active samples + * + * Sliced VBI is sent as ancillary data during horizontal blanking + * Raw VBI is sent as active video samples during vertcal blanking + * + * We use a BT.656 pxiel clock of 13.5 MHz and a BT.656 active line + * length of 720 pixels @ 4:2:2 sampling. Thus... + * + * For NTSC: + * + * (1/15,734 kHz) * 2 * 13.5 MHz = 1716 samples/line = + * 4 bytes SAV + 268 bytes anc data + 4 bytes SAV + 1440 active samples + * + * For PAL: + * + * (1/15,625 kHz) * 2 * 13.5 MHz = 1728 samples/line = + * 4 bytes SAV + 280 bytes anc data + 4 bytes SAV + 1440 active samples + * + */ + + /* CX18-AV-Core number of VBI samples output per horizontal line */ + cx->vbi.raw_decoder_line_size = 1444; /* 4 byte SAV + 2 * 720 */ + cx->vbi.sliced_decoder_line_size = 272; /* 60 Hz: 268+4, 50 Hz: 280+4 */ + + /* CX18-AV-Core VBI samples/line possibly rounded up */ + cx->vbi.raw_size = 1444; /* Real max size is 1444 */ + cx->vbi.sliced_size = 284; /* Real max size is 284 */ + + /* + * CX18-AV-Core SAV/EAV RP codes in VIP 1.x mode + * Task Field VerticalBlank HorizontalBlank 0 0 0 0 + */ + cx->vbi.raw_decoder_sav_odd_field = 0x20; /* V */ + cx->vbi.raw_decoder_sav_even_field = 0x60; /* FV */ + cx->vbi.sliced_decoder_sav_odd_field = 0xB0; /* T VH - actually EAV */ + cx->vbi.sliced_decoder_sav_even_field = 0xF0; /* TFVH - actually EAV */ return 0; } @@ -640,6 +674,7 @@ static void __devinit cx18_init_struct2(struct cx18 *cx) cx->av_state.aud_input = CX18_AV_AUDIO8; cx->av_state.audclk_freq = 48000; cx->av_state.audmode = V4L2_TUNER_MODE_LANG1; + /* FIXME - 8 is NTSC value, investigate */ cx->av_state.vbi_line_offset = 8; } |