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v4l2: set default resolution if caps has no such information

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Output may attemp to set the width and height to zero values if
caps has no such information, which will cause capture get invalid
dimensions. Then decoder reports negotiation failure.

So need to set default resolution if caps has no such information.
Real values can be set again until source change event is signaled.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2400>
This commit is contained in:
Hou Qi 2022-05-10 16:20:46 +08:00 committed by GStreamer Marge Bot
parent 5542dd395d
commit 85b53bb65d
1 changed files with 7 additions and 0 deletions
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7
subprojects/gst-plugins-good/sys/v4l2/gstv4l2object.c
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@ -54,6 +54,8 @@ GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
#define DEFAULT_PROP_IO_MODE GST_V4L2_IO_AUTO
#define ENCODED_BUFFER_SIZE (2 * 1024 * 1024)
#define GST_V4L2_DEFAULT_WIDTH 320
#define GST_V4L2_DEFAULT_HEIGHT 240
enum
{
@ -3563,6 +3565,11 @@ gst_v4l2_object_set_format_full (GstV4l2Object * v4l2object, GstCaps * caps,
pixelformat = fmtdesc->pixelformat;
width = GST_VIDEO_INFO_WIDTH (&info);
height = GST_VIDEO_INFO_FIELD_HEIGHT (&info);
/* if caps has no width and height info, use default value */
if (V4L2_TYPE_IS_OUTPUT (v4l2object->type) && width == 0 && height == 0) {
width = GST_V4L2_DEFAULT_WIDTH;
height = GST_V4L2_DEFAULT_HEIGHT;
}
fps_n = GST_VIDEO_INFO_FPS_N (&info);
fps_d = GST_VIDEO_INFO_FPS_D (&info);