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v4l2src: Add source resolution change support

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This patch adds support for source resolution change detection.
Resolution change is signaled by drivers when a change in the detected
signal have been detected. This is notably seen on HDMI receivers.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/870>
This commit is contained in:
Nicolas Dufresne 2021-02-04 16:59:44 -05:00
parent bb1d9b398e
commit 1094e2548e
1 changed files with 18 additions and 4 deletions
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22
sys/v4l2/gstv4l2src.c
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@ -606,8 +606,14 @@ gst_v4l2src_decide_allocation (GstBaseSrc * bsrc, GstQuery * query)
GstV4l2Error error = GST_V4L2_ERROR_INIT;
caps = gst_caps_make_writable (caps);
if (!(ret = gst_v4l2src_set_format (src, caps, &error)))
ret = gst_v4l2src_set_format (src, caps, &error);
if (ret) {
GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (src->v4l2object->pool);
gst_v4l2_buffer_pool_enable_resolution_change (pool);
} else {
gst_v4l2_error (src, &error);
}
gst_caps_unref (caps);
src->pending_set_fmt = FALSE;
@ -829,7 +835,6 @@ gst_v4l2src_create (GstPushSrc * src, GstBuffer ** buf)
{
GstV4l2Src *v4l2src = GST_V4L2SRC (src);
GstV4l2Object *obj = v4l2src->v4l2object;
GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL_CAST (obj->pool);
GstFlowReturn ret;
GstClock *clock;
GstClockTime abs_time, base_time, timestamp, duration;
@ -838,15 +843,24 @@ gst_v4l2src_create (GstPushSrc * src, GstBuffer ** buf)
gboolean half_frame;
do {
GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL_CAST (obj->pool);
ret = GST_BASE_SRC_CLASS (parent_class)->alloc (GST_BASE_SRC (src), 0,
obj->info.size, buf);
if (G_UNLIKELY (ret != GST_FLOW_OK))
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
if (ret == GST_V4L2_FLOW_RESOLUTION_CHANGE) {
GST_INFO_OBJECT (v4l2src, "Resolution change detected.");
gst_base_src_negotiate (GST_BASE_SRC (src));
continue;
}
goto alloc_failed;
}
ret = gst_v4l2_buffer_pool_process (pool, buf, NULL);
} while (ret == GST_V4L2_FLOW_CORRUPTED_BUFFER);
} while (ret == GST_V4L2_FLOW_CORRUPTED_BUFFER ||
ret == GST_V4L2_FLOW_RESOLUTION_CHANGE);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto error;