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v4l2: Expose RGB32 formats with and without alpha

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As soon a the alpha component can be set, we can expose the RGB32 and BGR32
format as ARGB and BGRA as long we can deterministically set the alpha padding
value.
This commit is contained in:
Nicolas Dufresne 2014-03-19 17:00:56 -04:00
parent 403909d873
commit a8e81bd81e
3 changed files with 56 additions and 0 deletions
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51
sys/v4l2/gstv4l2object.c
View file

@ -1278,14 +1278,33 @@ gst_v4l2_object_get_caps_helper (GstV4L2FormatFlags flags)
structure =
gst_v4l2_object_v4l2fourcc_to_bare_struct (gst_v4l2_formats[i].format);
if (structure) {
GstStructure *alt_s = NULL;
if (gst_v4l2_formats[i].dimensions) {
gst_structure_set (structure,
"width", GST_TYPE_INT_RANGE, 1, GST_V4L2_MAX_SIZE,
"height", GST_TYPE_INT_RANGE, 1, GST_V4L2_MAX_SIZE,
"framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 100, 1, NULL);
}
switch (gst_v4l2_formats[i].format) {
case V4L2_PIX_FMT_RGB32:
alt_s = gst_structure_copy (structure);
gst_structure_set (alt_s, "format", G_TYPE_STRING, "ARGB", NULL);
break;
case V4L2_PIX_FMT_BGR32:
alt_s = gst_structure_copy (structure);
gst_structure_set (alt_s, "format", G_TYPE_STRING, "BGRA", NULL);
default:
break;
}
gst_caps_append_structure (caps, structure);
if (alt_s)
gst_caps_append_structure (caps, alt_s);
}
}
@ -1768,6 +1787,8 @@ static void
gst_v4l2_object_update_and_append (GstV4l2Object * v4l2object,
guint32 format, GstCaps * caps, GstStructure * s)
{
GstStructure *alt_s = NULL;
/* Encoded stream on output buffer need to be parsed */
if (v4l2object->type == V4L2_BUF_TYPE_VIDEO_OUTPUT ||
v4l2object->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
@ -1783,7 +1804,27 @@ gst_v4l2_object_update_and_append (GstV4l2Object * v4l2object,
}
}
if (v4l2object->has_alpha_component &&
(v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE ||
v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)) {
switch (format) {
case V4L2_PIX_FMT_RGB32:
alt_s = gst_structure_copy (s);
gst_structure_set (alt_s, "format", G_TYPE_STRING, "ARGB", NULL);
break;
case V4L2_PIX_FMT_BGR32:
alt_s = gst_structure_copy (s);
gst_structure_set (alt_s, "format", G_TYPE_STRING, "BGRA", NULL);
break;
default:
break;
}
}
gst_caps_append_structure (caps, s);
if (alt_s)
gst_caps_append_structure (caps, alt_s);
}
static GstCaps *
@ -2495,6 +2536,16 @@ gst_v4l2_object_set_format (GstV4l2Object * v4l2object, GstCaps * caps)
if (is_mplane && format.fmt.pix_mp.num_planes != n_v4l_planes)
goto invalid_planes;
if (GST_VIDEO_INFO_HAS_ALPHA (&info)) {
struct v4l2_control ctl = { 0, };
ctl.id = V4L2_CID_ALPHA_COMPONENT;
ctl.value = 0xff;
if (v4l2_ioctl (fd, VIDIOC_S_CTRL, &ctl) < 0)
GST_WARNING_OBJECT (v4l2object->element,
"Failed to set alpha component value");
}
/* Is there a reason we require the caller to always specify a framerate? */
GST_DEBUG_OBJECT (v4l2object->element, "Desired framerate: %u/%u", fps_n,
fps_d);

2
sys/v4l2/gstv4l2object.h
View file

@ -99,8 +99,10 @@ struct _GstV4l2Object {
GstVideoInfo info;
GstVideoAlignment align;
/* Features */
gboolean need_video_meta;
gboolean need_crop_meta;
gboolean has_alpha_component;
/* only used if the device supports MPLANE
* nb planes is meaning of v4l2 planes

3
sys/v4l2/v4l2_calls.c
View file

@ -374,6 +374,9 @@ gst_v4l2_fill_lists (GstV4l2Object * v4l2object)
/* FIXME: We should implement GstMixer interface instead */
/* but let's not be pedantic and make element more useful for now */
break;
case V4L2_CID_ALPHA_COMPONENT:
v4l2object->has_alpha_component = TRUE;
break;
default:
GST_DEBUG_OBJECT (e,
"ControlID %s (%x) unhandled, FIXME", control.name, n);