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v4l2object: Move mplane logic into gst_v4l2_object_get_caps_info()

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It makes the gst_v4l2_object_set_format() slightly simplier and will make that
logic reusable. Note that gst_v4l2_object_has_mplane() will always return the
same value for one device. There is no need to check against the caps as this
has already been done by _open.

https://bugzilla.gnome.org/show_bug.cgi?id=720568
This commit is contained in:
Nicolas Dufresne 2013-12-04 15:09:10 -05:00
parent 4956b46bab
commit a64de44a0c
1 changed files with 44 additions and 51 deletions
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95
sys/v4l2/gstv4l2object.c
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@ -1611,29 +1611,36 @@ gst_v4l2_object_get_codec_caps (void)
return gst_caps_ref (caps);
}
/* if the device actually support multi-planar
* we also allow to use plane in a contiguous manner
* if the device can do that. Through prefered_non_contiguous */
static gboolean
gst_v4l2_object_has_mplane (GstV4l2Object * obj)
/* gst_v4l2_object_choose_fourcc:
* @obj a #GstV4l2Object
* @fourcc_splane The format type in single plane representation
* @fourcc_mplane The format type in multi-plane representation
* @fourcc Set to the first format to try
* @fourcc_alt The alternative format to use, or zero if mplane is not
* supported. Note that if alternate is used, the prefered_non_contiguous
* setting need to be inversed.
*
* Certain format can be stored into multi-planar buffer type with two
* representation. As an example, NV12, which has two planes, can be stored
* into 1 plane of multi-planar buffer sturcture, or two. This function will
* choose the right format to use base on the object settings.
*/
static void
gst_v4l2_object_choose_fourcc (GstV4l2Object * obj, guint32 fourcc_splane,
guint32 fourcc_mplane, guint32 * fourcc, guint32 * fourcc_alt)
{
gboolean ret = FALSE;
switch (obj->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
ret = (obj->vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE) != 0
&& obj->prefered_non_contiguous;
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
ret = (obj->vcap.capabilities & V4L2_CAP_VIDEO_OUTPUT_MPLANE) != 0
&& obj->prefered_non_contiguous;
break;
default:
ret = FALSE;
break;
if (V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
if (obj->prefered_non_contiguous) {
*fourcc = fourcc_mplane;
*fourcc_alt = fourcc_splane;
} else {
*fourcc = fourcc_splane;
*fourcc_alt = fourcc_mplane;
}
} else {
*fourcc = fourcc_splane;
*fourcc_alt = 0;
}
return ret;
}
/* collect data for the given caps
@ -1648,7 +1655,7 @@ gst_v4l2_object_get_caps_info (GstV4l2Object * v4l2object, GstCaps * caps,
struct v4l2_fmtdesc **format, GstVideoInfo * info)
{
GstStructure *structure;
guint32 fourcc;
guint32 fourcc, fourcc_alt = 0;
const gchar *mimetype;
struct v4l2_fmtdesc *fmt;
@ -1688,14 +1695,12 @@ gst_v4l2_object_get_caps_info (GstV4l2Object * v4l2object, GstCaps * caps,
fourcc = V4L2_PIX_FMT_YUV422P;
break;
case GST_VIDEO_FORMAT_NV12:
fourcc =
gst_v4l2_object_has_mplane (v4l2object) ? V4L2_PIX_FMT_NV12M :
V4L2_PIX_FMT_NV12;
gst_v4l2_object_choose_fourcc (v4l2object, V4L2_PIX_FMT_NV12,
V4L2_PIX_FMT_NV12M, &fourcc, &fourcc_alt);
break;
case GST_VIDEO_FORMAT_NV21:
fourcc =
gst_v4l2_object_has_mplane (v4l2object) ? V4L2_PIX_FMT_NV21M :
V4L2_PIX_FMT_NV21;
gst_v4l2_object_choose_fourcc (v4l2object, V4L2_PIX_FMT_NV21,
V4L2_PIX_FMT_NV21M, &fourcc, &fourcc_alt);
break;
#ifdef V4L2_PIX_FMT_YVYU
case GST_VIDEO_FORMAT_YVYU:
@ -1769,6 +1774,15 @@ gst_v4l2_object_get_caps_info (GstV4l2Object * v4l2object, GstCaps * caps,
goto unhandled_format;
fmt = gst_v4l2_object_get_format_from_fourcc (v4l2object, fourcc);
if (fmt == NULL && fourcc_alt != 0) {
GST_DEBUG_OBJECT (v4l2object, "No support for %" GST_FOURCC_FORMAT
" trying %" GST_FOURCC_FORMAT, GST_FOURCC_ARGS (fourcc),
GST_FOURCC_ARGS (fourcc_alt));
v4l2object->prefered_non_contiguous = !v4l2object->prefered_non_contiguous;
fmt = gst_v4l2_object_get_format_from_fourcc (v4l2object, fourcc_alt);
}
if (fmt == NULL)
goto unsupported_format;
@ -1794,7 +1808,6 @@ unsupported_format:
}
}
static gboolean
gst_v4l2_object_get_nearest_size (GstV4l2Object * v4l2object,
guint32 pixelformat, gint * width, gint * height, gboolean * interlaced);
@ -2494,28 +2507,8 @@ gst_v4l2_object_set_format (GstV4l2Object * v4l2object, GstCaps * caps)
gint width, height, fps_n, fps_d, stride;
gint i = 0;
if (V4L2_TYPE_IS_MULTIPLANAR (v4l2object->type)) {
/* gst does not distinguish GST_VIDEO_FORMAT_NV21 than GST_VIDEO_FORMAT_NV21M so
* we have to check it blindly
*/
if (!gst_v4l2_object_get_caps_info (v4l2object, caps, &fmtdesc, &info)) {
/* for example if the device supports NV21 and not NV21M, let's try with
* the non prefered one if we initially prefered_non_contiguous to TRUE
* in this case.
*/
GST_DEBUG_OBJECT (v4l2object->element,
"prefered multiplanar does not exist, try the other one");
v4l2object->prefered_non_contiguous =
!v4l2object->prefered_non_contiguous;
if (!gst_v4l2_object_get_caps_info (v4l2object, caps, &fmtdesc, &info))
goto invalid_caps;
}
} else {
if (!gst_v4l2_object_get_caps_info (v4l2object, caps, &fmtdesc, &info))
goto invalid_caps;
}
if (!gst_v4l2_object_get_caps_info (v4l2object, caps, &fmtdesc, &info))
goto invalid_caps;
pixelformat = fmtdesc->pixelformat;
width = GST_VIDEO_INFO_WIDTH (&info);