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376 lines
10 KiB
C
376 lines
10 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., 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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* SECTION:element-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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*
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* The element generate messages named
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* <classname>"barcode"</classname>. The structure containes these
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* fields:
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* <itemizedlist>
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* <listitem>
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* <para>
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* #GstClockTime
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* <classname>"timestamp"</classname>:
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* the timestamp of the buffer that triggered the message.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* gchar*
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* <classname>"type"</classname>:
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* the symbol type.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* gchar*
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* <classname>"symbol"</classname>:
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* the deteted bar code data.
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* </para>
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* </listitem>
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* <listitem>
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* <para>
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* gint
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* <classname>"quality"</classname>:
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* an unscaled, relative quantity: larger values are better than smaller
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* values.
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* </para>
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* </listitem>
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* </itemizedlist>
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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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PROP_MESSAGE,
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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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/* FIXME: add YVU9 and YUV9 once we have a GstVideoFormat for that */
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#define ZBAR_YUV_CAPS \
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"{ Y800, I420, YV12, NV12, NV21, Y41B, Y42B }"
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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_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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static gboolean gst_zbar_start (GstBaseTransform * base);
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static gboolean gst_zbar_stop (GstBaseTransform * base);
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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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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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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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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_details_simple (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_pad_template (gstelement_class,
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gst_static_pad_template_get (&gst_zbar_sink_template));
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&gst_zbar_src_template));
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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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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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}
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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->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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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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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 *zbar = GST_ZBAR (base);
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GstVideoInfo info;
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GST_DEBUG_OBJECT (zbar,
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"set_caps: in %" GST_PTR_FORMAT " out %" GST_PTR_FORMAT, incaps, outcaps);
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if (!gst_video_info_from_caps (&info, incaps))
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goto invalid_caps;
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zbar->info = info;
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return TRUE;
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/* ERRORS */
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invalid_caps:
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{
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GST_ERROR_OBJECT (zbar, "invalid caps received");
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return FALSE;
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}
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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 = GST_ZBAR (base);
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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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GstVideoFrame frame;
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const zbar_symbol_t *symbol;
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int n;
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if (base->passthrough)
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goto done;
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gst_video_frame_map (&frame, &zbar->info, outbuf, GST_MAP_READ);
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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 (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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/* post a message */
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s = gst_structure_new ("barcode",
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"timestamp", G_TYPE_UINT64, GST_BUFFER_TIMESTAMP (outbuf),
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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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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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}
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}
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out:
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/* clean up */
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gst_video_frame_unmap (&frame);
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zbar_image_scanner_recycle_image (zbar->scanner, image);
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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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gst_zbar_start (GstBaseTransform * base)
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{
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GstZBar *zbar = GST_ZBAR (base);
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gst_video_info_init (&zbar->info);
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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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