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seen that passthrough is never set for this element, no need to allow to remove the 'transform' call
373 lines
11 KiB
C
373 lines
11 KiB
C
/* GStreamer
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* Copyright (C) 2009 Stefan Kost <ensonic@users.sf.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-zbar
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* @title: zbar
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*
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* Detect bar codes in the video streams and send them as element messages to
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* the #GstBus if .#GstZBar:message property is %TRUE.
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* If the .#GstZBar:attach-frame property is %TRUE, the posted barcode message
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* includes a sample of the frame where the barcode was detected (Since 1.6).
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*
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* The element generate messages named`barcode`. The structure contains these fields:
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*
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* * #GstClockTime `timestamp`: the timestamp of the buffer that triggered the message.
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* * gchar * `type`: the symbol type.
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* * gchar * `symbol`: the detected bar code data.
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* * gint `quality`: an unscaled, relative quantity: larger values are better than smaller
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* values.
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* * GstSample `frame`: the frame in which the barcode message was detected, if
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* the .#GstZBar:attach-frame property was set to %TRUE (Since 1.6)
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*
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* ## Example launch lines
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* |[
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* gst-launch-1.0 -m v4l2src ! videoconvert ! zbar ! videoconvert ! xvimagesink
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* ]| This pipeline will detect barcodes and send them as messages.
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* |[
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* gst-launch-1.0 -m v4l2src ! tee name=t ! queue ! videoconvert ! zbar ! fakesink t. ! queue ! xvimagesink
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* ]| Same as above, but running the filter on a branch to keep the display in color
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstzbar.h"
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#include <string.h>
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#include <math.h>
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#include <gst/video/video.h>
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GST_DEBUG_CATEGORY_STATIC (zbar_debug);
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#define GST_CAT_DEFAULT zbar_debug
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/* GstZBar signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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enum
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{
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PROP_0,
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PROP_MESSAGE,
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PROP_ATTACH_FRAME,
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PROP_CACHE
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};
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#define DEFAULT_CACHE FALSE
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#define DEFAULT_MESSAGE TRUE
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#define DEFAULT_ATTACH_FRAME FALSE
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#define ZBAR_YUV_CAPS \
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"{ Y800, I420, YV12, NV12, NV21, Y41B, Y42B, YUV9, YVU9 }"
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static GstStaticPadTemplate gst_zbar_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (ZBAR_YUV_CAPS))
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);
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static GstStaticPadTemplate gst_zbar_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (ZBAR_YUV_CAPS))
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);
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static void gst_zbar_finalize (GObject * object);
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static void gst_zbar_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_zbar_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static gboolean gst_zbar_start (GstBaseTransform * base);
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static gboolean gst_zbar_stop (GstBaseTransform * base);
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static GstFlowReturn gst_zbar_transform_frame_ip (GstVideoFilter * vfilter,
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GstVideoFrame * frame);
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#define gst_zbar_parent_class parent_class
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G_DEFINE_TYPE (GstZBar, gst_zbar, GST_TYPE_VIDEO_FILTER);
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static void
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gst_zbar_class_init (GstZBarClass * g_class)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstBaseTransformClass *trans_class;
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GstVideoFilterClass *vfilter_class;
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gobject_class = G_OBJECT_CLASS (g_class);
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gstelement_class = GST_ELEMENT_CLASS (g_class);
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trans_class = GST_BASE_TRANSFORM_CLASS (g_class);
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vfilter_class = GST_VIDEO_FILTER_CLASS (g_class);
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gobject_class->set_property = gst_zbar_set_property;
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gobject_class->get_property = gst_zbar_get_property;
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gobject_class->finalize = gst_zbar_finalize;
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g_object_class_install_property (gobject_class, PROP_MESSAGE,
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g_param_spec_boolean ("message", "message",
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"Post a barcode message for each detected code",
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DEFAULT_MESSAGE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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/**
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* GstZBar::attach-frame:
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*
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* Attach the frame in which the barcode was detected to the posted
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* barcode message.
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*
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* Since: 1.6
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*/
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g_object_class_install_property (gobject_class, PROP_ATTACH_FRAME,
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g_param_spec_boolean ("attach-frame", "Attach frame",
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"Attach a frame dump to each barcode message",
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DEFAULT_ATTACH_FRAME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_CACHE,
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g_param_spec_boolean ("cache", "cache",
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"Enable or disable the inter-image result cache",
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DEFAULT_CACHE,
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G_PARAM_READWRITE | GST_PARAM_MUTABLE_READY |
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G_PARAM_STATIC_STRINGS));
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gst_element_class_set_static_metadata (gstelement_class, "Barcode detector",
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"Filter/Analyzer/Video",
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"Detect bar codes in the video streams",
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"Stefan Kost <ensonic@users.sf.net>");
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_zbar_sink_template);
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_zbar_src_template);
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trans_class->start = GST_DEBUG_FUNCPTR (gst_zbar_start);
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trans_class->stop = GST_DEBUG_FUNCPTR (gst_zbar_stop);
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vfilter_class->transform_frame_ip =
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GST_DEBUG_FUNCPTR (gst_zbar_transform_frame_ip);
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}
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static void
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gst_zbar_init (GstZBar * zbar)
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{
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zbar->cache = DEFAULT_CACHE;
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zbar->message = DEFAULT_MESSAGE;
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zbar->attach_frame = DEFAULT_ATTACH_FRAME;
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zbar->scanner = zbar_image_scanner_create ();
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}
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static void
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gst_zbar_finalize (GObject * object)
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{
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GstZBar *zbar = GST_ZBAR (object);
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zbar_image_scanner_destroy (zbar->scanner);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_zbar_set_property (GObject * object, guint prop_id, const GValue * value,
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GParamSpec * pspec)
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{
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GstZBar *zbar;
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g_return_if_fail (GST_IS_ZBAR (object));
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zbar = GST_ZBAR (object);
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switch (prop_id) {
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case PROP_CACHE:
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zbar->cache = g_value_get_boolean (value);
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break;
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case PROP_MESSAGE:
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zbar->message = g_value_get_boolean (value);
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break;
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case PROP_ATTACH_FRAME:
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zbar->attach_frame = g_value_get_boolean (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_zbar_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstZBar *zbar;
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g_return_if_fail (GST_IS_ZBAR (object));
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zbar = GST_ZBAR (object);
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switch (prop_id) {
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case PROP_CACHE:
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g_value_set_boolean (value, zbar->cache);
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break;
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case PROP_MESSAGE:
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g_value_set_boolean (value, zbar->message);
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break;
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case PROP_ATTACH_FRAME:
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g_value_set_boolean (value, zbar->attach_frame);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static GstFlowReturn
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gst_zbar_transform_frame_ip (GstVideoFilter * vfilter, GstVideoFrame * frame)
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{
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GstZBar *zbar = GST_ZBAR (vfilter);
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gpointer data;
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gint stride, height;
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zbar_image_t *image;
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const zbar_symbol_t *symbol;
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int n;
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image = zbar_image_create ();
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/* all formats we support start with an 8-bit Y plane. zbar doesn't need
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* to know about the chroma plane(s) */
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data = GST_VIDEO_FRAME_COMP_DATA (frame, 0);
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stride = GST_VIDEO_FRAME_COMP_STRIDE (frame, 0);
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height = GST_VIDEO_FRAME_HEIGHT (frame);
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zbar_image_set_format (image, GST_MAKE_FOURCC ('Y', '8', '0', '0'));
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zbar_image_set_size (image, stride, height);
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zbar_image_set_data (image, (gpointer) data, stride * height, NULL);
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/* scan the image for barcodes */
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n = zbar_scan_image (zbar->scanner, image);
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if (G_UNLIKELY (n == -1)) {
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GST_WARNING_OBJECT (zbar, "Error trying to scan frame. Skipping");
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goto out;
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}
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if (n == 0)
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goto out;
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/* extract results */
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symbol = zbar_image_first_symbol (image);
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for (; symbol; symbol = zbar_symbol_next (symbol)) {
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zbar_symbol_type_t typ = zbar_symbol_get_type (symbol);
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const char *data = zbar_symbol_get_data (symbol);
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gint quality = zbar_symbol_get_quality (symbol);
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GST_DEBUG_OBJECT (zbar, "decoded %s symbol \"%s\" at quality %d",
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zbar_get_symbol_name (typ), data, quality);
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if (zbar->cache && zbar_symbol_get_count (symbol) != 0)
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continue;
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if (zbar->message) {
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GstMessage *m;
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GstStructure *s;
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GstSample *sample;
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GstCaps *sample_caps;
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GstClockTime timestamp, running_time, stream_time, duration;
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timestamp = GST_BUFFER_TIMESTAMP (frame->buffer);
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duration = GST_BUFFER_DURATION (frame->buffer);
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running_time =
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gst_segment_to_running_time (&GST_BASE_TRANSFORM (zbar)->segment,
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GST_FORMAT_TIME, timestamp);
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stream_time =
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gst_segment_to_stream_time (&GST_BASE_TRANSFORM (zbar)->segment,
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GST_FORMAT_TIME, timestamp);
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s = gst_structure_new ("barcode",
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"timestamp", G_TYPE_UINT64, timestamp,
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"stream-time", G_TYPE_UINT64, stream_time,
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"running-time", G_TYPE_UINT64, running_time,
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"type", G_TYPE_STRING, zbar_get_symbol_name (typ),
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"symbol", G_TYPE_STRING, data, "quality", G_TYPE_INT, quality, NULL);
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if (GST_CLOCK_TIME_IS_VALID (duration))
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gst_structure_set (s, "duration", G_TYPE_UINT64, duration, NULL);
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if (zbar->attach_frame) {
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/* create a sample from image */
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sample_caps = gst_video_info_to_caps (&frame->info);
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sample = gst_sample_new (frame->buffer, sample_caps, NULL, NULL);
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gst_caps_unref (sample_caps);
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gst_structure_set (s, "frame", GST_TYPE_SAMPLE, sample, NULL);
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gst_sample_unref (sample);
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}
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m = gst_message_new_element (GST_OBJECT (zbar), s);
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gst_element_post_message (GST_ELEMENT (zbar), m);
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} else if (zbar->attach_frame)
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GST_WARNING_OBJECT (zbar,
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"attach-frame=true has no effect if message=false");
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}
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out:
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/* clean up */
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zbar_image_scanner_recycle_image (zbar->scanner, image);
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zbar_image_destroy (image);
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return GST_FLOW_OK;
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}
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static gboolean
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gst_zbar_start (GstBaseTransform * base)
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{
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GstZBar *zbar = GST_ZBAR (base);
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/* start the cache if enabled (e.g. for filtering dupes) */
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zbar_image_scanner_enable_cache (zbar->scanner, zbar->cache);
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return TRUE;
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}
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static gboolean
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gst_zbar_stop (GstBaseTransform * base)
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{
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GstZBar *zbar = GST_ZBAR (base);
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/* stop the cache if enabled (e.g. for filtering dupes) */
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zbar_image_scanner_enable_cache (zbar->scanner, zbar->cache);
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return TRUE;
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}
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static gboolean
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plugin_init (GstPlugin * plugin)
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{
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GST_DEBUG_CATEGORY_INIT (zbar_debug, "zbar", 0, "zbar");
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return gst_element_register (plugin, "zbar", GST_RANK_NONE, GST_TYPE_ZBAR);
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}
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GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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zbar,
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"zbar barcode scanner",
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plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);
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