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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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382 lines
12 KiB
C++
382 lines
12 KiB
C++
/* GStreamer
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* Copyright (C) 2019 Stéphane Cerveau <scerveau@collabora.com>
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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-zxing
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* @title: zxing
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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 .#GstZXing:message property is %TRUE.
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* If the .#GstZXing: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 1.18).
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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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* * #GstClockTime `stream-time`: timestamp converted to stream-time.
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* * #GstClockTime `running-time`: timestamp converted to running-time.
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* * #GstSample `frame`: the frame in which the barcode message was detected, if
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* the .#GstZXing:attach-frame property was set to %TRUE (Since 1.18)
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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 ! zxing ! 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 ! zxing ! 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 "gstzxing.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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#include "ReadBarcode.h"
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#include "TextUtfEncoding.h"
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using namespace ZXing;
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GST_DEBUG_CATEGORY_STATIC (zxing_debug);
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#define GST_CAT_DEFAULT zxing_debug
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#define DEFAULT_MESSAGE TRUE
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#define DEFAULT_ATTACH_FRAME FALSE
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#define DEFAULT_TRY_ROTATE FALSE
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#define DEFAULT_TRY_FASTER FALSE
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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_TRY_ROTATE,
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PROP_TRY_FASTER,
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PROP_FORMAT,
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};
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enum
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{
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BARCODE_FORMAT_ALL,
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BARCODE_FORMAT_AZTEC,
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BARCODE_FORMAT_CODABAR,
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BARCODE_FORMAT_CODE_39,
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BARCODE_FORMAT_CODE_93,
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BARCODE_FORMAT_CODE_128,
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BARCODE_FORMAT_DATA_MATRIX,
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BARCODE_FORMAT_EAN_8,
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BARCODE_FORMAT_EAN_13,
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BARCODE_FORMAT_ITF,
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BARCODE_FORMAT_MAXICODE,
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BARCODE_FORMAT_PDF_417,
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BARCODE_FORMAT_QR_CODE,
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BARCODE_FORMAT_RSS_14,
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BARCODE_FORMAT_RSS_EXPANDED,
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BARCODE_FORMAT_UPC_A,
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BARCODE_FORMAT_UPC_E,
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BARCODE_FORMAT_UPC_EAN_EXTENSION
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};
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static const GEnumValue barcode_formats[] = {
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{BARCODE_FORMAT_ALL, "ALL", "all"},
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{BARCODE_FORMAT_AZTEC, "AZTEC", "aztec"},
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{BARCODE_FORMAT_CODABAR, "CODABAR", "codabar"},
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{BARCODE_FORMAT_CODE_39, "CODE_39", "code_39"},
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{BARCODE_FORMAT_CODE_93, "CODE_93", "code_93"},
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{BARCODE_FORMAT_CODE_128, "CODE_128", "code_128"},
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{BARCODE_FORMAT_DATA_MATRIX, "PNG", "png"},
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{BARCODE_FORMAT_EAN_8, "EAN_8", "ean_8"},
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{BARCODE_FORMAT_EAN_13, "EAN_13", "ean_13"},
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{BARCODE_FORMAT_ITF, "ITF", "itf"},
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{BARCODE_FORMAT_MAXICODE, "MAXICODE", "maxicode"},
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{BARCODE_FORMAT_PDF_417, "PDF_417", "pdf_417"},
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{BARCODE_FORMAT_QR_CODE, "QR_CODE", "qr_code"},
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{BARCODE_FORMAT_RSS_14, "RSS_14", "rss_14"},
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{BARCODE_FORMAT_RSS_EXPANDED, "RSS_EXPANDED", "rss_expanded"},
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{BARCODE_FORMAT_UPC_A, "UPC_A", "upc_a"},
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{BARCODE_FORMAT_UPC_E, "UPC_E", "upc_e"},
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{BARCODE_FORMAT_UPC_EAN_EXTENSION, "UPC_EAN_EXTENSION", "upc_ean_expansion"},
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{0, NULL, NULL},
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};
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#define GST_TYPE_BARCODE_FORMAT (gst_barcode_format_get_type())
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static GType
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gst_barcode_format_get_type (void)
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{
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static GType barcode_format_type = 0;
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if (!barcode_format_type) {
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barcode_format_type =
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g_enum_register_static ("GstBarCodeFormat", barcode_formats);
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}
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return barcode_format_type;
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}
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#define ZXING_YUV_CAPS \
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"{ Y800, I420, YV12, NV12, NV21, Y41B, Y42B, YUV9, YVU9 }"
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static GstStaticPadTemplate gst_zxing_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 (ZXING_YUV_CAPS))
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);
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static GstStaticPadTemplate gst_zxing_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 (ZXING_YUV_CAPS))
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);
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/**
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* GstZXing:
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*
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* Opaque data structure.
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*/
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struct _GstZXing
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{
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/*< private > */
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GstVideoFilter videofilter;
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/* properties */
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gboolean message;
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gboolean attach_frame;
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gboolean rotate;
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gboolean faster;
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guint format;
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};
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static void gst_zxing_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_zxing_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstFlowReturn gst_zxing_transform_frame_ip (GstVideoFilter * vfilter,
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GstVideoFrame * frame);
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#define gst_zxing_parent_class parent_class
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G_DEFINE_TYPE_WITH_CODE (GstZXing, gst_zxing,
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GST_TYPE_VIDEO_FILTER,
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GST_DEBUG_CATEGORY_INIT (zxing_debug, "zxing", 0,
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"debug category for zxing element"));
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static void
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gst_zxing_class_init (GstZXingClass * g_class)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_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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vfilter_class = GST_VIDEO_FILTER_CLASS (g_class);
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gobject_class->set_property = gst_zxing_set_property;
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gobject_class->get_property = gst_zxing_get_property;
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g_object_class_install_property (gobject_class, PROP_MESSAGE,
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g_param_spec_boolean ("message",
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"message", "Post a barcode message for each detected code",
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DEFAULT_MESSAGE,
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(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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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,
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(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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g_object_class_install_property (gobject_class, PROP_TRY_ROTATE,
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g_param_spec_boolean ("try-rotate", "Try rotate",
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"Try to rotate the frame to detect barcode (slower)",
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DEFAULT_TRY_ROTATE,
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(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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g_object_class_install_property (gobject_class, PROP_TRY_FASTER,
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g_param_spec_boolean ("try-faster", "Try faster",
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"Try faster to analyze the frame", DEFAULT_TRY_FASTER,
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(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
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g_object_class_install_property (gobject_class, PROP_FORMAT,
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g_param_spec_enum ("format", "barcode format", "Barcode image format",
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GST_TYPE_BARCODE_FORMAT, BARCODE_FORMAT_ALL,
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(GParamFlags) (G_PARAM_READWRITE | 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 with zxing library",
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"Stéphane Cerveau <scerveau@collabora.com>");
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_zxing_sink_template);
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_zxing_src_template);
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vfilter_class->transform_frame_ip =
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GST_DEBUG_FUNCPTR (gst_zxing_transform_frame_ip);
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}
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static void
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gst_zxing_init (GstZXing * zxing)
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{
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zxing->message = DEFAULT_MESSAGE;
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zxing->attach_frame = DEFAULT_ATTACH_FRAME;
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zxing->rotate = DEFAULT_TRY_ROTATE;
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zxing->faster = DEFAULT_TRY_FASTER;
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zxing->format = BARCODE_FORMAT_ALL;
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}
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static void
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gst_zxing_set_property (GObject * object, guint prop_id, const GValue * value,
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GParamSpec * pspec)
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{
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GstZXing *zxing;
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g_return_if_fail (GST_IS_ZXING (object));
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zxing = GST_ZXING (object);
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switch (prop_id) {
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case PROP_MESSAGE:
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zxing->message = g_value_get_boolean (value);
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break;
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case PROP_ATTACH_FRAME:
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zxing->attach_frame = g_value_get_boolean (value);
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break;
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case PROP_TRY_ROTATE:
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zxing->rotate = g_value_get_boolean (value);
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break;
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case PROP_TRY_FASTER:
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zxing->faster = g_value_get_boolean (value);
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break;
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case PROP_FORMAT:
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zxing->format = g_value_get_enum (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_zxing_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstZXing *zxing;
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g_return_if_fail (GST_IS_ZXING (object));
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zxing = GST_ZXING (object);
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switch (prop_id) {
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case PROP_MESSAGE:
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g_value_set_boolean (value, zxing->message);
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break;
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case PROP_ATTACH_FRAME:
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g_value_set_boolean (value, zxing->attach_frame);
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break;
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case PROP_TRY_ROTATE:
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g_value_set_boolean (value, zxing->rotate);
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break;
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case PROP_TRY_FASTER:
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g_value_set_boolean (value, zxing->faster);
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break;
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case PROP_FORMAT:
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g_value_set_enum (value, zxing->format);
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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_zxing_transform_frame_ip (GstVideoFilter * vfilter, GstVideoFrame * frame)
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{
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GstZXing *zxing = GST_ZXING (vfilter);
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gpointer data;
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gint height, width;
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/* all formats we support start with an 8-bit Y plane. zxing 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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width = GST_VIDEO_FRAME_WIDTH (frame);
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height = GST_VIDEO_FRAME_HEIGHT (frame);
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/*Init a grayscale source */
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auto result = ReadBarcode (width, height, (unsigned char *) data, width,
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{ BarcodeFormatFromString (barcode_formats[zxing->format].value_name) },
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zxing->rotate, !zxing->faster);
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if (result.isValid ()) {
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GST_DEBUG_OBJECT (zxing, "Symbol found. Text: %s Format: %s",
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TextUtfEncoding::ToUtf8 (result.text ()).c_str (),
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ToString (result.format ()));
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} else {
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goto out;
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}
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/* extract results */
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if (zxing->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;
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timestamp = GST_BUFFER_TIMESTAMP (frame->buffer);
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running_time =
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gst_segment_to_running_time (&GST_BASE_TRANSFORM (zxing)->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 (zxing)->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, ToString (result.format ()),
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"symbol", G_TYPE_STRING,
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TextUtfEncoding::ToUtf8 (result.text ()).c_str (), NULL);
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if (zxing->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 (zxing), s);
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gst_element_post_message (GST_ELEMENT (zxing), m);
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} else if (zxing->attach_frame)
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GST_WARNING_OBJECT (zxing,
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"attach-frame=true has no effect if message=false");
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out:
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return GST_FLOW_OK;
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}
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