On Wednesday 18 November 2009 20:01:43 Karicheri, Muralidharan wrote:
> Hans,
>
> Thanks for reviewing this. I will try to send an updated patch today.
>
> BTW, I have posted the documentation patch to the list for review.
I did some quick 64-bit tests and discovered that we need to add the packed
attribute to struct v4l2_bt_timings and struct v4l2_dv_timings in order to
prevent nasty 32-bit to 64-bit conversions in v4l2-compat-ioctl32.c.
See below:
> >> +/*
> >> + * D V B T T I M I N G S
> >> + */
> >> +
> >> +/* BT.656/BT.1120 timing data */
> >> +struct v4l2_bt_timings {
> >> + __u32 width; /* width in pixels */
> >> + __u32 height; /* height in lines */
> >> + __u32 interlaced; /* Interlaced or progressive */
> >> + __u32 polarities; /* Positive or negative polarity */
> >> + __u64 pixelclock; /* Pixel clock in HZ. Ex. 74.25MHz->74250000
> >> */
> >> + __u32 hfrontporch; /* Horizpontal front porch in pixels */
> >> + __u32 hsync; /* Horizontal Sync length in pixels */
> >> + __u32 hbackporch; /* Horizontal back porch in pixels */
> >> + __u32 vfrontporch; /* Vertical front porch in pixels */
> >> + __u32 vsync; /* Vertical Sync length in lines */
> >> + __u32 vbackporch; /* Vertical back porch in lines */
> >> + __u32 il_vfrontporch; /* Vertical front porch for bottom field of
> >> + * interlaced field formats
> >> + */
> >> + __u32 il_vsync; /* Vertical sync length for bottom field of
> >> + * interlaced field formats
> >> + */
> >> + __u32 il_vbackporch; /* Vertical back porch for bottom field of
> >> + * interlaced field formats
> >> + */
> >> + __u32 reserved[16];
> >> +};
End with:
} __attribute__ ((packed));
> >> +
> >> +/* Interlaced or progressive format */
> >> +#define V4L2_DV_PROGRESSIVE 0
> >> +#define V4L2_DV_INTERLACED 1
> >> +
> >> +/* Polarities. If bit is not set, it is assumed to be negative polarity
> >*/
> >> +#define V4L2_DV_VSYNC_POS_POL 0x00000001
> >> +#define V4L2_DV_HSYNC_POS_POL 0x00000002
> >> +
> >> +/* BT.656/1120 timing type */
> >> +enum v4l2_dv_timings_type {
> >> + V4L2_DV_BT_656_1120,
> >> +};
> >
> >I forgot something: we shouldn't use enums as that can give problems on
> >some
> >architectures (ARM being one of them, I believe). So this should become a
> >define and the type field below a __u32.
> >
> >> +
> >> +/* DV timings */
> >> +struct v4l2_dv_timings {
> >> + enum v4l2_dv_timings_type type;
> >> + union {
> >> + struct v4l2_bt_timings bt;
> >> + __u32 reserved[32];
> >> + };
> >> +};
Ditto.
I also attached a small diff for the v4l2-apps/test/ioctl-test.c source which
I used to test this.
The patch is Signed-off-by: Hans Verkuil <[email protected]>
You can include this when you post the v4l2-apps patches.
Regards,
Hans
--
Hans Verkuil - video4linux developer - sponsored by TANDBERG Telecom
diff -r 19ac1f4cde54 v4l2-apps/test/ioctl-test.c
--- a/v4l2-apps/test/ioctl-test.c Tue Nov 17 20:30:42 2009 -0200
+++ b/v4l2-apps/test/ioctl-test.c Wed Nov 18 19:30:38 2009 +0100
@@ -91,6 +91,8 @@
struct v4l2_dbg_register p_v4l2_dbg_register;
struct v4l2_dbg_chip_ident p_v4l2_dbg_chip_ident;
struct v4l2_hw_freq_seek p_v4l2_hw_freq_seek;
+ struct v4l2_dv_preset p_v4l2_dv_preset;
+ struct v4l2_dv_timings p_v4l2_dv_timings;
};
#define ioc(cmd) { cmd, #cmd }
@@ -197,6 +199,12 @@
ioc(VIDIOC_DBG_G_REGISTER), /* struct v4l2_register */
ioc(VIDIOC_DBG_G_CHIP_IDENT), /* struct v4l2_dbg_chip_ident */
ioc(VIDIOC_S_HW_FREQ_SEEK), /* struct v4l2_hw_freq_seek */
+ ioc(VIDIOC_ENUM_DV_PRESETS), /* struct v4l2_dv_enum_preset */
+ ioc(VIDIOC_S_DV_PRESET), /* struct v4l2_dv_preset */
+ ioc(VIDIOC_G_DV_PRESET), /* struct v4l2_dv_preset */
+ ioc(VIDIOC_QUERY_DV_PRESET), /* struct v4l2_dv_preset */
+ ioc(VIDIOC_S_DV_TIMINGS), /* struct v4l2_dv_timings */
+ ioc(VIDIOC_G_DV_TIMINGS), /* struct v4l2_dv_timings */
#ifdef __OLD_VIDIOC_
ioc(VIDIOC_OVERLAY_OLD), /* int */
ioc(VIDIOC_S_PARM_OLD), /* struct v4l2_streamparm */
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