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v4l2: fix latency

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This commit is contained in:
Wim Taymans 2012-03-26 15:51:28 +02:00
parent fa436c0799
commit cfe58e7156
1 changed files with 7 additions and 2 deletions
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9
sys/v4l2/gstv4l2src.c
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@ -609,6 +609,7 @@ gst_v4l2src_query (GstBaseSrc * bsrc, GstQuery * query)
case GST_QUERY_LATENCY:{
GstClockTime min_latency, max_latency;
guint32 fps_n, fps_d;
guint max_buffers;
/* device must be open */
if (!GST_V4L2_IS_OPEN (obj)) {
@ -631,8 +632,12 @@ gst_v4l2src_query (GstBaseSrc * bsrc, GstQuery * query)
min_latency = gst_util_uint64_scale_int (GST_SECOND, fps_d, fps_n);
/* max latency is total duration of the frame buffer */
max_latency =
GST_V4L2_BUFFER_POOL_CAST (obj->pool)->max_buffers * min_latency;
max_buffers = GST_V4L2_BUFFER_POOL_CAST (obj->pool)->max_buffers;
if (max_buffers == 0)
max_latency = -1;
else
max_latency = max_buffers * min_latency;
GST_DEBUG_OBJECT (bsrc,
"report latency min %" GST_TIME_FORMAT " max %" GST_TIME_FORMAT,