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GObject ╰── GInitiallyUnowned ╰── GstObject ╰── GstElement ╰── GstBaseTransform ╰── GstVideoFilter ╰── GstZBar
Detect bar codes in the video streams and send them as element messages to
the GstBus if .“message” property is TRUE.
If the .“attach-frame” property is TRUE, the posted barcode message
includes a sample of the frame where the barcode was detected (Since 1.6).
The element generate messages namedbarcode. The structure containes these fields:
GstClockTime timestamp: the timestamp of the buffer that triggered the message.
gchar * type: the symbol type.
gchar * symbol: the deteted bar code data.
gint quality: an unscaled, relative quantity: larger values are better than smaller
values.
GstSample frame: the frame in which the barcode message was detected, if
the .“attach-frame” property was set to TRUE (Since 1.6)
1 |
gst-launch-1.0 -m v4l2src ! videoconvert ! zbar ! videoconvert ! xvimagesink |
This pipeline will detect barcodes and send them as messages.
1 |
gst-launch-1.0 -m v4l2src ! tee name=t ! queue ! videoconvert ! zbar ! fakesink t. ! queue ! xvimagesink |
Same as above, but running the filter on a branch to keep the display in color
plugin |
zbar |
author |
Stefan Kost <ensonic@users.sf.net> |
class |
Filter/Analyzer/Video |
name |
sink |
direction |
sink |
presence |
always |
details |
video/x-raw, format=(string){ Y800, I420, YV12, NV12, NV21, Y41B, Y42B, YUV9, YVU9 }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ] |
name |
src |
direction |
source |
presence |
always |
details |
video/x-raw, format=(string){ Y800, I420, YV12, NV12, NV21, Y41B, Y42B, YUV9, YVU9 }, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ] |
“message” property“message” gboolean
Post a barcode message for each detected code.
Flags: Read / Write
Default value: TRUE
“cache” property“cache” gboolean
Enable or disable the inter-image result cache.
Flags: Read / Write
Default value: FALSE
“attach-frame” property“attach-frame” gboolean
Attach a frame dump to each barcode message.
Flags: Read / Write
Default value: FALSE