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v4l2src: handle latency query before setting up the bufferpool

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Fixes crash if no bufferpool is set up yet.

https://bugzilla.gnome.org/show_bug.cgi?id=684430
This commit is contained in:
Sjoerd Simons 2012-09-20 10:07:24 +02:00 committed by Tim-Philipp Müller
parent c9821d31f8
commit 5d1ed54814
1 changed files with 3 additions and 2 deletions
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5
sys/v4l2/gstv4l2src.c
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@ -624,7 +624,7 @@ gst_v4l2src_query (GstBaseSrc * bsrc, GstQuery * query)
case GST_QUERY_LATENCY:{ case GST_QUERY_LATENCY:{
GstClockTime min_latency, max_latency; GstClockTime min_latency, max_latency;
guint32 fps_n, fps_d; guint32 fps_n, fps_d;
guint num_buffers; guint num_buffers = 0;
/* device must be open */ /* device must be open */
if (!GST_V4L2_IS_OPEN (obj)) { if (!GST_V4L2_IS_OPEN (obj)) {
@ -647,7 +647,8 @@ gst_v4l2src_query (GstBaseSrc * bsrc, GstQuery * query)
min_latency = gst_util_uint64_scale_int (GST_SECOND, fps_d, fps_n); min_latency = gst_util_uint64_scale_int (GST_SECOND, fps_d, fps_n);
/* max latency is total duration of the frame buffer */ /* max latency is total duration of the frame buffer */
num_buffers = GST_V4L2_BUFFER_POOL_CAST (obj->pool)->num_buffers; if (obj->pool != NULL)
num_buffers = GST_V4L2_BUFFER_POOL_CAST (obj->pool)->num_buffers;
if (num_buffers == 0) if (num_buffers == 0)
max_latency = -1; max_latency = -1;