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v4l2src: Move preferred resolution query before the probe

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As we lock the DV_TIMINGS (and standards in the future), we need to probe the
caps after, otherwise, we may endup fixating to an unsupported resolution,
which would lead to a not-negotiated error.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/870>
This commit is contained in:
Nicolas Dufresne 2021-02-11 14:24:29 -05:00
parent b530c0ef4e
commit 409ea3ac84
1 changed files with 15 additions and 11 deletions
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26
sys/v4l2/gstv4l2src.c
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@ -520,8 +520,11 @@ gst_v4l2src_query_preferred_dv_timings (GstV4l2Src * v4l2src,
/* If are are not streaming (e.g. we received source-change event), lock the
* new timing immediatly so that TRY_FMT can properly work */
if (!obj->pool || !GST_V4L2_BUFFER_POOL_IS_STREAMING (obj->pool))
if (!obj->pool || !GST_V4L2_BUFFER_POOL_IS_STREAMING (obj->pool)) {
gst_v4l2_set_dv_timings (obj, &dv_timings);
/* Setting a new DV timings invalidates the probed caps. */
gst_caps_replace (&obj->probed_caps, NULL);
}
GST_INFO_OBJECT (v4l2src, "Using DV Timings: %i x %i (%i/%i fps)",
pref->width, pref->height, pref->fps_n, pref->fps_d);
@ -578,6 +581,17 @@ gst_v4l2src_negotiate (GstBaseSrc * basesrc)
GstCaps *caps = NULL;
GstCaps *peercaps = NULL;
gboolean result = FALSE;
/* Let's prefer a good resolution as of today's standard. */
struct PreferredCapsInfo pref = {
3840, 2160, 120, 1
};
gboolean have_pref;
/* For drivers that has DV timings or other default size query
* capabilities, we will prefer that resolution. This must happen before we
* probe the caps, as locking DV Timings or standards will change result of
* the caps enumeration. */
have_pref = gst_v4l2src_query_preferred_size (v4l2src, &pref);
/* first see what is possible on our source pad */
thiscaps = gst_pad_query_caps (GST_BASE_SRC_PAD (basesrc), NULL);
@ -606,15 +620,6 @@ gst_v4l2src_negotiate (GstBaseSrc * basesrc)
if (caps) {
/* now fixate */
if (!gst_caps_is_empty (caps)) {
/* Let's prefer a good resolution as of today's standard. */
struct PreferredCapsInfo pref = {
3840, 2160, 120, 1
};
gboolean have_pref;
/* For drivers that has DV timings or other default size query
* capabilities, we will prefer that resolution. */
have_pref = gst_v4l2src_query_preferred_size (v4l2src, &pref);
/* otherwise consider the first structure from peercaps to be a
* preference. This is useful for matching a reported native display,
@ -942,7 +947,6 @@ gst_v4l2src_create (GstPushSrc * src, GstBuffer ** buf)
* streamoff in order to allow locking a new DV_TIMING which will
* influence the output of TRY_FMT */
gst_v4l2src_stop (GST_BASE_SRC (src));
gst_caps_replace (&obj->probed_caps, NULL);
/* Force renegotiation */
v4l2src->renegotiation_adjust = v4l2src->offset + 1;