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v4l2object: add gst_v4l2_object_try_format

Browse source 
Similar to set_format but it uses TRY_FMT instead of S_FMT

https://bugzilla.gnome.org/show_bug.cgi?id=682770
This commit is contained in:
Thiago Santos 2015-03-13 18:47:55 +00:00
parent 3c595f308a
commit 6cfa6c0da8
2 changed files with 63 additions and 24 deletions
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86
sys/v4l2/gstv4l2object.c
View file

@ -2647,8 +2647,9 @@ gst_v4l2_object_extrapolate_stride (const GstVideoFormatInfo * finfo,
return estride;
}
gboolean
gst_v4l2_object_set_format (GstV4l2Object * v4l2object, GstCaps * caps)
static gboolean
gst_v4l2_object_set_format_full (GstV4l2Object * v4l2object, GstCaps * caps,
gboolean try_only)
{
gint fd = v4l2object->video_fd;
struct v4l2_format format;
@ -2665,7 +2666,8 @@ gst_v4l2_object_set_format (GstV4l2Object * v4l2object, GstCaps * caps)
enum v4l2_colorspace colorspace = 0;
GST_V4L2_CHECK_OPEN (v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
if (!try_only)
GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
is_mplane = V4L2_TYPE_IS_MULTIPLANAR (v4l2object->type);
@ -2796,8 +2798,13 @@ gst_v4l2_object_set_format (GstV4l2Object * v4l2object, GstCaps * caps)
colorspace);
}
if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0)
goto set_fmt_failed;
if (try_only) {
if (v4l2_ioctl (fd, VIDIOC_TRY_FMT, &format) < 0)
goto try_fmt_failed;
} else {
if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0)
goto set_fmt_failed;
}
GST_DEBUG_OBJECT (v4l2object->element, "Got format of %dx%d, format "
"%" GST_FOURCC_FORMAT ", nb planes %d, colorspace %d",
@ -2840,6 +2847,9 @@ 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 (try_only) /* good enough for trying only */
return TRUE;
if (GST_VIDEO_INFO_HAS_ALPHA (&info)) {
struct v4l2_control ctl = { 0, };
ctl.id = V4L2_CID_ALPHA_COMPONENT;
@ -2894,7 +2904,7 @@ gst_v4l2_object_set_format (GstV4l2Object * v4l2object, GstCaps * caps)
goto set_parm_failed;
if (streamparm.parm.capture.timeperframe.numerator > 0 &&
streamparm.parm.capture.timeperframe.denominator > 0) {
streamparm.parm.capture.timeperframe.denominator > 0) {
/* get new values */
fps_d = streamparm.parm.capture.timeperframe.numerator;
fps_n = streamparm.parm.capture.timeperframe.denominator;
@ -2904,8 +2914,7 @@ gst_v4l2_object_set_format (GstV4l2Object * v4l2object, GstCaps * caps)
} else {
/* fix v4l2 capture driver to provide framerate values */
GST_WARNING_OBJECT (v4l2object->element,
"Reuse caps framerate %u/%u - fix v4l2 capture driver",
fps_n, fps_d);
"Reuse caps framerate %u/%u - fix v4l2 capture driver", fps_n, fps_d);
}
GST_VIDEO_INFO_FPS_N (&info) = fps_n;
@ -2929,6 +2938,17 @@ invalid_caps:
caps);
return FALSE;
}
try_fmt_failed:
{
if (errno == EBUSY) {
GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, BUSY,
(_("Device '%s' is busy"), v4l2object->videodev),
("Call to TRY_FMT failed for %" GST_FOURCC_FORMAT " @ %dx%d: %s",
GST_FOURCC_ARGS (pixelformat), width, height,
g_strerror (errno)));
}
return FALSE;
}
set_fmt_failed:
{
if (errno == EBUSY) {
@ -2949,30 +2969,36 @@ set_fmt_failed:
}
invalid_dimensions:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
(_("Device '%s' cannot capture at %dx%d"),
v4l2object->videodev, width, height),
("Tried to capture at %dx%d, but device returned size %dx%d",
width, height, format.fmt.pix.width, format.fmt.pix.height));
if (!try_only) {
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
(_("Device '%s' cannot capture at %dx%d"),
v4l2object->videodev, width, height),
("Tried to capture at %dx%d, but device returned size %dx%d",
width, height, format.fmt.pix.width, format.fmt.pix.height));
}
return FALSE;
}
invalid_pixelformat:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
(_("Device '%s' cannot capture in the specified format"),
v4l2object->videodev),
("Tried to capture in %" GST_FOURCC_FORMAT
", but device returned format" " %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (pixelformat),
GST_FOURCC_ARGS (format.fmt.pix.pixelformat)));
if (!try_only) {
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
(_("Device '%s' cannot capture in the specified format"),
v4l2object->videodev),
("Tried to capture in %" GST_FOURCC_FORMAT
", but device returned format" " %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (pixelformat),
GST_FOURCC_ARGS (format.fmt.pix.pixelformat)));
}
return FALSE;
}
invalid_planes:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
(_("Device '%s' does support non-contiguous planes"),
v4l2object->videodev),
("Device wants %d planes", format.fmt.pix_mp.num_planes));
if (!try_only) {
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
(_("Device '%s' does support non-contiguous planes"),
v4l2object->videodev),
("Device wants %d planes", format.fmt.pix_mp.num_planes));
}
return FALSE;
}
get_parm_failed:
@ -2999,6 +3025,18 @@ pool_failed:
}
}
gboolean
gst_v4l2_object_set_format (GstV4l2Object * v4l2object, GstCaps * caps)
{
return gst_v4l2_object_set_format_full (v4l2object, caps, FALSE);
}
gboolean
gst_v4l2_object_try_format (GstV4l2Object * v4l2object, GstCaps * caps)
{
return gst_v4l2_object_set_format_full (v4l2object, caps, TRUE);
}
/**
* gst_v4l2_object_acquire_format:
* @v4l2object the object

1
sys/v4l2/gstv4l2object.h
View file

@ -251,6 +251,7 @@ gint gst_v4l2_object_extrapolate_stride (const GstVideoFormatInfo * fin
gint plane, gint stride);
gboolean gst_v4l2_object_set_format (GstV4l2Object * v4l2object, GstCaps * caps);
gboolean gst_v4l2_object_try_format (GstV4l2Object * v4l2object, GstCaps * caps);
gboolean gst_v4l2_object_caps_equal (GstV4l2Object * v4l2object, GstCaps * caps);