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videoaggregator: Fix locking around vagg->info

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Take `GST_OBJECT_LOCK` when writing `vagg->info`, so that reading in
subclasses is protected against races, as documented in the struct.

    /*< public >*/
    /* read-only, with OBJECT_LOCK */
    GstVideoInfo                  info;

`gst_video_aggregator_default_negotiated_src_caps` should take the
`GST_VIDEO_AGGREGATOR_LOCK` to avoid racing with
`gst_video_aggregator_reset` called by
`gst_video_aggregator_release_pad` of the last sinkpad. Otherwise it can
happen that `latency = gst_util_uint64_scale (...` gets called with a
zero framerate.

There doesn't seem to be any reason not to use the local `info` instead
of `vagg->info`, so do that.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/915>
This commit is contained in:
Jan Alexander Steffens (heftig) 2020-11-03 17:00:53 +01:00 committed by GStreamer Merge Bot
parent b005d472f7
commit b3fe2d3623
1 changed files with 17 additions and 5 deletions
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22
gst-libs/gst/video/gstvideoaggregator.c
View file

@ -1091,12 +1091,15 @@ gst_video_aggregator_default_negotiated_src_caps (GstAggregator * agg,
{
GstVideoAggregator *vagg = GST_VIDEO_AGGREGATOR (agg);
gboolean at_least_one_alpha = FALSE;
gboolean ret = FALSE;
const GstVideoFormatInfo *finfo;
GstVideoInfo info;
GList *l;
GST_INFO_OBJECT (agg->srcpad, "set src caps: %" GST_PTR_FORMAT, caps);
GST_VIDEO_AGGREGATOR_LOCK (vagg);
GST_OBJECT_LOCK (vagg);
for (l = GST_ELEMENT (vagg)->sinkpads; l; l = l->next) {
GstVideoAggregatorPad *mpad = l->data;
@ -1111,7 +1114,7 @@ gst_video_aggregator_default_negotiated_src_caps (GstAggregator * agg,
GST_OBJECT_UNLOCK (vagg);
if (!gst_video_info_from_caps (&info, caps))
return FALSE;
goto unlock_and_return;
if (GST_VIDEO_INFO_FPS_N (&vagg->info) != GST_VIDEO_INFO_FPS_N (&info) ||
GST_VIDEO_INFO_FPS_D (&vagg->info) != GST_VIDEO_INFO_FPS_D (&info)) {
@ -1125,15 +1128,17 @@ gst_video_aggregator_default_negotiated_src_caps (GstAggregator * agg,
gst_video_aggregator_reset_qos (vagg);
}
GST_OBJECT_LOCK (vagg);
vagg->info = info;
GST_OBJECT_UNLOCK (vagg);
finfo = vagg->info.finfo;
finfo = info.finfo;
if (at_least_one_alpha && !(finfo->flags & GST_VIDEO_FORMAT_FLAG_ALPHA)) {
GST_ELEMENT_ERROR (vagg, CORE, NEGOTIATION,
("At least one of the input pads contains alpha, but configured caps don't support alpha."),
("Either convert your inputs to not contain alpha or add a videoconvert after the aggregator"));
return FALSE;
goto unlock_and_return;
}
/* Then browse the sinks once more, setting or unsetting conversion if needed */
@ -1148,11 +1153,15 @@ gst_video_aggregator_default_negotiated_src_caps (GstAggregator * agg,
gst_aggregator_set_src_caps (agg, caps);
latency = gst_util_uint64_scale (GST_SECOND,
GST_VIDEO_INFO_FPS_D (&vagg->info), GST_VIDEO_INFO_FPS_N (&vagg->info));
GST_VIDEO_INFO_FPS_D (&info), GST_VIDEO_INFO_FPS_N (&info));
gst_aggregator_set_latency (agg, latency, latency);
}
return TRUE;
ret = TRUE;
unlock_and_return:
GST_VIDEO_AGGREGATOR_UNLOCK (vagg);
return ret;
}
static gboolean
@ -1484,7 +1493,10 @@ gst_video_aggregator_reset (GstVideoAggregator * vagg)
GstAggregator *agg = GST_AGGREGATOR (vagg);
GList *l;
GST_OBJECT_LOCK (vagg);
gst_video_info_init (&vagg->info);
GST_OBJECT_UNLOCK (vagg);
vagg->priv->ts_offset = 0;
vagg->priv->nframes = 0;
vagg->priv->live = FALSE;