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v4l2object: Read driver selected interlace mode

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If there was no interlace-mode field in the caps. Read back the value
selected by the driver. This way, if the driver does not support
progressive, then it will automatically negotiate the returned mode
unless this mode is not supported by GStreamer.

This method was already used for colorimetry. Just like colorimetry, the
interlace mode is not longer probed by v4l2src dues to performance
issues.

Fixes #511
This commit is contained in:
Nicolas Dufresne 2018-10-18 22:23:31 -04:00
parent 40fc8aea8f
commit dbaca549ab
1 changed files with 9 additions and 4 deletions
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13
sys/v4l2/gstv4l2object.c
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@ -3583,13 +3583,18 @@ gst_v4l2_object_set_format_full (GstV4l2Object * v4l2object, GstCaps * caps,
if (is_mplane && format.fmt.pix_mp.num_planes != n_v4l_planes)
goto invalid_planes;
if ((is_mplane && format.fmt.pix_mp.field != field)
|| format.fmt.pix.field != field)
/* used to check colorimetry and interlace mode fields presence */
s = gst_caps_get_structure (caps, 0);
if (!gst_v4l2_object_get_interlace_mode (format.fmt.pix.field,
&info.interlace_mode))
goto invalid_field;
if (gst_structure_has_field (s, "interlace-mode")) {
if (format.fmt.pix.field != field)
goto invalid_field;
}
gst_v4l2_object_get_colorspace (&format, &info.colorimetry);
s = gst_caps_get_structure (caps, 0);
if (gst_structure_has_field (s, "colorimetry")) {
if (!gst_v4l2_video_colorimetry_matches (&info.colorimetry,
gst_structure_get_string (s, "colorimetry")))