Em 28-05-2012 07:46, Hans Verkuil escreveu:
> From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
>
> Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
> Acked-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> include/linux/videodev2.h | 19 +++++++++++++++++--
> 1 file changed, 17 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
> index 2339678..013ee46 100644
> --- a/include/linux/videodev2.h
> +++ b/include/linux/videodev2.h
> @@ -2023,7 +2023,8 @@ struct v4l2_tuner {
> __u32 audmode;
> __s32 signal;
> __s32 afc;
> - __u32 reserved[4];
> + __u32 band;
> + __u32 reserved[3];
> };
>
> struct v4l2_modulator {
> @@ -2033,7 +2034,8 @@ struct v4l2_modulator {
> __u32 rangelow;
> __u32 rangehigh;
> __u32 txsubchans;
> - __u32 reserved[4];
> + __u32 band;
> + __u32 reserved[3];
> };
>
> /* Flags for the 'capability' field */
> @@ -2048,6 +2050,11 @@ struct v4l2_modulator {
> #define V4L2_TUNER_CAP_RDS 0x0080
> #define V4L2_TUNER_CAP_RDS_BLOCK_IO 0x0100
> #define V4L2_TUNER_CAP_RDS_CONTROLS 0x0200
> +#define V4L2_TUNER_CAP_BAND_FM_EUROPE_US 0x00010000
> +#define V4L2_TUNER_CAP_BAND_FM_JAPAN 0x00020000
> +#define V4L2_TUNER_CAP_BAND_FM_RUSSIAN 0x00040000
> +#define V4L2_TUNER_CAP_BAND_FM_WEATHER 0x00080000
> +#define V4L2_TUNER_CAP_BAND_AM_MW 0x00100000
Frequency band is already specified by rangelow/rangehigh.
Why do you need to duplicate this information?
>
> /* Flags for the 'rxsubchans' field */
> #define V4L2_TUNER_SUB_MONO 0x0001
> @@ -2065,6 +2072,14 @@ struct v4l2_modulator {
> #define V4L2_TUNER_MODE_LANG1 0x0003
> #define V4L2_TUNER_MODE_LANG1_LANG2 0x0004
>
> +/* Values for the 'band' field */
> +#define V4L2_TUNER_BAND_DEFAULT 0
What does "default" mean?
> +#define V4L2_TUNER_BAND_FM_EUROPE_US 1 /* 87.5 Mhz - 108 MHz */
EUROPE_US is a bad name for this range. According with Wikipedia, this
range is used at "ITU region 1" (Europe/Africa), while America uses
ITU region 2 (88-108).
In Brazil, the range from 87.5-88 were added several years ago, so it is
currently at the "ITU region 1" range, just like in US.
I don't doubt that there are still some places at the 88-108 MHz range.
> +#define V4L2_TUNER_BAND_FM_JAPAN 2 /* 76 MHz - 90 MHz */
This is currently true, but wikipedia points that they may increase it
(from 76MHz to 108MHz?) after the end of NTSC broadcast.
The DTV range there starts at channel 14 (473 MHz and upper). Maybe they
may reserve the channel 7-13 range (VHF High - starting at 177 MHz) like
Brazil for DTV.
Anyway, what I mean is that calling a frequency range with a Country name
is dangerous, as frequency ranges can vary from time to time.
> +#define V4L2_TUNER_BAND_FM_RUSSIAN 3 /* 65.8 MHz - 74 MHz */
AFAIKT, this is wrong. The range used there is 65.8-104MHz.
It used to be 65.8 to 100 MHz.
Also, other ex-soviet countries are still using such range.
> +#define V4L2_TUNER_BAND_FM_WEATHER 4 /* 162.4 MHz - 162.55 MHz */
> +#define V4L2_TUNER_BAND_AM_MW 5
> +
> struct v4l2_frequency {
> __u32 tuner;
> __u32 type; /* enum v4l2_tuner_type */
>
Regards,
Mauro
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