mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-27 04:01:08 +00:00
zbar: wrap zbar library as a image analyzer
zbar is a bar code scanner library.
This commit is contained in:
Stefan Kost
parent
647ee9772c
commit
7f26eaf9c5
4 changed files with 360 additions and 0 deletions
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@ -299,6 +299,7 @@ AG_GST_CHECK_PLUGIN(valve)
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AG_GST_CHECK_PLUGIN(videomeasure)
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AG_GST_CHECK_PLUGIN(videosignal)
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AG_GST_CHECK_PLUGIN(vmnc)
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AG_GST_CHECK_PLUGIN(zbar)
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dnl *** plug-ins to exclude ***
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@ -1596,6 +1597,12 @@ AG_GST_CHECK_FEATURE(SCHRO, [Schroedinger video codec], schro, [
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AG_GST_PKG_CHECK_MODULES(SCHRO, schroedinger-1.0 >= 1.0.7)
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])
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dnl *** zbar ***
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translit(dnm, m, l) AM_CONDITIONAL(USE_ZBAR, true)
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AG_GST_CHECK_FEATURE(ZBAR, [ZBar barcode detector], zbar, [
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AG_GST_PKG_CHECK_MODULES(ZBAR, zbar >= 0.9)
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])
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else
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dnl not building plugins with external dependencies,
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@ -1655,6 +1662,7 @@ AM_CONDITIONAL(USE_WININET, false)
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AM_CONDITIONAL(USE_ACM, false)
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AM_CONDITIONAL(USE_VDPAU, false)
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AM_CONDITIONAL(USE_SCHRO, false)
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AM_CONDITIONAL(USE_ZBAR, false)
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fi dnl of EXT plugins
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@ -1855,6 +1863,7 @@ ext/swfdec/Makefile
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ext/theora/Makefile
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ext/timidity/Makefile
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ext/xvid/Makefile
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ext/zbar/Makefile
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po/Makefile.in
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docs/Makefile
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docs/plugins/Makefile
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11
ext/zbar/Makefile.am
Normal file
11
ext/zbar/Makefile.am
Normal file
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@ -0,0 +1,11 @@
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plugin_LTLIBRARIES = libgstzbar.la
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libgstzbar_la_SOURCES = gstzbar.c
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libgstzbar_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_BASE_CFLAGS) $(GST_CFLAGS) $(ZBAR_CFLAGS)
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libgstzbar_la_LIBADD = $(GST_PLUGINS_BASE_LIBS) -lgstvideo-@GST_MAJORMINOR@ $(GST_BASE_LIBS) $(GST_LIBS) $(ZBAR_LIBS)
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libgstzbar_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
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libgstzbar_la_LIBTOOLFLAGS = --tag=disable-static
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noinst_HEADERS = gstzbar.h
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269
ext/zbar/gstzbar.c
Normal file
269
ext/zbar/gstzbar.c
Normal file
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@ -0,0 +1,269 @@
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/* 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* This file was (probably) generated from
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* gstvideotemplate.c,v 1.12 2004/01/07 21:07:12 ds Exp
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* and
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* make_filter,v 1.6 2004/01/07 21:33:01 ds Exp
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*/
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/**
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* SECTION:element-zbar
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*
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* Detect bar codes in the video streams and send them as app messages.
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*
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* <refsect2>
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* <title>Example launch lines</title>
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* |[
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* gst-launch -m v4l2src ! ffmpegcolorspace ! zbar ! ffmpegcolorspace ! 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 -m v4l2src ! tee name=t ! queue ! ffmpegcolorspace ! 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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* </refsect2>
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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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/* FILL ME */
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};
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#define DEFAULT_PROP_ZBAR 1
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static const GstElementDetails zbar_details =
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GST_ELEMENT_DETAILS ("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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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_YUV ("{ Y800 }"))
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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_YUV ("{ Y800 }"))
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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_set_caps (GstBaseTransform * base, GstCaps * incaps,
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GstCaps * outcaps);
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static GstFlowReturn gst_zbar_transform_ip (GstBaseTransform * transform,
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GstBuffer * buf);
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GST_BOILERPLATE (GstZBar, gst_zbar, GstVideoFilter, GST_TYPE_VIDEO_FILTER);
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static void
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gst_zbar_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details (element_class, &zbar_details);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_zbar_sink_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_zbar_src_template));
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}
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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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GstBaseTransformClass *trans_class;
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gobject_class = G_OBJECT_CLASS (g_class);
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trans_class = GST_BASE_TRANSFORM_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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trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_zbar_set_caps);
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trans_class->transform_ip = GST_DEBUG_FUNCPTR (gst_zbar_transform_ip);
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}
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static void
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gst_zbar_init (GstZBar * zbar, GstZBarClass * g_class)
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{
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zbar->scanner = zbar_image_scanner_create ();
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/* FIXME: do this in start/stop vmethods */
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zbar_image_scanner_enable_cache (zbar->scanner, TRUE);
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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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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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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 gboolean
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gst_zbar_set_caps (GstBaseTransform * base, GstCaps * incaps, GstCaps * outcaps)
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{
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GstZBar *this;
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GstStructure *structure;
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gboolean res;
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this = GST_ZBAR (base);
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GST_DEBUG_OBJECT (this,
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"set_caps: in %" GST_PTR_FORMAT " out %" GST_PTR_FORMAT, incaps, outcaps);
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structure = gst_caps_get_structure (incaps, 0);
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res = gst_structure_get_int (structure, "width", &this->width);
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res &= gst_structure_get_int (structure, "height", &this->height);
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if (!res)
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goto done;
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done:
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return res;
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}
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static GstFlowReturn
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gst_zbar_transform_ip (GstBaseTransform * base, GstBuffer * outbuf)
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{
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GstZBar *zbar;
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guint8 *data;
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guint size;
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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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zbar = GST_ZBAR (base);
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if (base->passthrough)
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goto done;
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data = GST_BUFFER_DATA (outbuf);
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size = GST_BUFFER_SIZE (outbuf);
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image = zbar_image_create ();
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zbar_image_set_format (image, *(gint *) "Y800");
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zbar_image_set_size (image, zbar->width, zbar->height);
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zbar_image_set_data (image, (gpointer) data, zbar->width * zbar->height,
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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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/* 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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/* do something useful with results */
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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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printf ("decoded %s symbol \"%s\"\n", zbar_get_symbol_name (typ), data);
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}
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/* clean up */
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zbar_image_destroy (image);
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done:
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return GST_FLOW_OK;
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/* ERRORS */
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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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71
ext/zbar/gstzbar.h
Normal file
71
ext/zbar/gstzbar.h
Normal file
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@ -0,0 +1,71 @@
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/* 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_VIDEO_ZBAR_H__
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#define __GST_VIDEO_ZBAR_H__
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#include <gst/video/gstvideofilter.h>
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#include <zbar.h>
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G_BEGIN_DECLS
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#define GST_TYPE_ZBAR \
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(gst_zbar_get_type())
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#define GST_ZBAR(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ZBAR,GstZBar))
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#define GST_ZBAR_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ZBAR,GstZBarClass))
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#define GST_IS_ZBAR(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ZBAR))
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#define GST_IS_ZBAR_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ZBAR))
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typedef struct _GstZBar GstZBar;
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typedef struct _GstZBarClass GstZBarClass;
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/**
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* GstZBar:
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*
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* Opaque data structure.
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*/
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struct _GstZBar
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{
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GstVideoFilter videofilter;
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/* format */
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gint width;
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gint height;
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/* properties */
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/* internals */
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zbar_image_scanner_t *scanner;
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};
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struct _GstZBarClass
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{
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GstVideoFilterClass parent_class;
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};
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GType gst_zbar_get_type(void);
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G_END_DECLS
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#endif /* __GST_VIDEO_ZBAR_H__ */
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