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gstreamer: Document improvements when updating minimum GStreamer version

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A const_cast<> was recently added to fix a compilation issue with older
GStreamer versions. Add a comment to indicate it can be removed when
bumping the minimum GStreamer version requirement. While at it, also
document a possible future improvement in the same function, and wrap
long lines.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
This commit is contained in:
Laurent Pinchart 2025-05-22 11:47:29 +02:00
parent d3f3b95b64
commit 04e7823eb2
1 changed files with 17 additions and 3 deletions
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20
src/gstreamer/gstlibcamerasrc.cpp
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@ -285,10 +285,19 @@ gst_libcamera_extrapolate_info(GstVideoInfo *info, guint32 stride)
} }
static GstFlowReturn static GstFlowReturn
gst_libcamera_video_frame_copy(GstBuffer *src, GstBuffer *dest, const GstVideoInfo *dest_info, guint32 stride) gst_libcamera_video_frame_copy(GstBuffer *src, GstBuffer *dest,
const GstVideoInfo *dest_info, guint32 stride)
{ {
GstVideoInfo src_info = *dest_info; /*
* When dropping support for versions earlier than v1.22.0, use
*
* g_auto (GstVideoFrame) src_frame = GST_VIDEO_FRAME_INIT;
* g_auto (GstVideoFrame) dest_frame = GST_VIDEO_FRAME_INIT;
*
* and drop the gst_video_frame_unmap() calls.
*/
GstVideoFrame src_frame, dest_frame; GstVideoFrame src_frame, dest_frame;
GstVideoInfo src_info = *dest_info;
gst_libcamera_extrapolate_info(&src_info, stride); gst_libcamera_extrapolate_info(&src_info, stride);
src_info.size = gst_buffer_get_size(src); src_info.size = gst_buffer_get_size(src);
@ -298,7 +307,12 @@ gst_libcamera_video_frame_copy(GstBuffer *src, GstBuffer *dest, const GstVideoIn
return GST_FLOW_ERROR; return GST_FLOW_ERROR;
} }
if (!gst_video_frame_map(&dest_frame, const_cast<GstVideoInfo *>(dest_info), dest, GST_MAP_WRITE)) { /*
* When dropping support for versions earlier than 1.20.0, drop the
* const_cast<>().
*/
if (!gst_video_frame_map(&dest_frame, const_cast<GstVideoInfo *>(dest_info),
dest, GST_MAP_WRITE)) {
GST_ERROR("Could not map dest buffer"); GST_ERROR("Could not map dest buffer");
gst_video_frame_unmap(&src_frame); gst_video_frame_unmap(&src_frame);
return GST_FLOW_ERROR; return GST_FLOW_ERROR;