gstreamer/ext/zxing/gstzxing.cpp

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/* GStreamer
* Copyright (C) 2019 Stéphane Cerveau <scerveau@collabora.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-zxing
* @title: zxing
*
* Detect bar codes in the video streams and send them as element messages to
* the #GstBus if .#GstZXing:message property is %TRUE.
* If the .#GstZXing:attach-frame property is %TRUE, the posted barcode message
* includes a sample of the frame where the barcode was detected (Since 1.18).
*
* The element generate messages named `barcode`. The structure contains these fields:
*
* * #GstClockTime `timestamp`: the timestamp of the buffer that triggered the message.
* * gchar * `type`: the symbol type.
* * gchar * `symbol`: the detected bar code data.
* * #GstClockTime `stream-time`: timestamp converted to stream-time.
* * #GstClockTime `running-time`: timestamp converted to running-time.
* * #GstSample `frame`: the frame in which the barcode message was detected, if
* the .#GstZXing:attach-frame property was set to %TRUE (Since 1.18)
*
* This element is based on the c++ implementation of zxing which can found
* at https://github.com/nu-book/zxing-cpp.
*
* ## Example launch lines
* |[
* gst-launch-1.0 -m v4l2src ! videoconvert ! zxing ! videoconvert ! xvimagesink
* ]| This pipeline will detect barcodes and send them as messages.
* |[
* gst-launch-1.0 -m v4l2src ! tee name=t ! queue ! videoconvert ! zxing ! fakesink t. ! queue ! xvimagesink
* ]| Same as above, but running the filter on a branch to keep the display in color
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstzxing.h"
#include <string.h>
#include <math.h>
#include <gst/video/video.h>
#include "ReadBarcode.h"
#include "TextUtfEncoding.h"
using namespace ZXing;
GST_DEBUG_CATEGORY_STATIC (zxing_debug);
#define GST_CAT_DEFAULT zxing_debug
#define DEFAULT_MESSAGE TRUE
#define DEFAULT_ATTACH_FRAME FALSE
#define DEFAULT_TRY_ROTATE FALSE
#define DEFAULT_TRY_FASTER FALSE
enum
{
PROP_0,
PROP_MESSAGE,
PROP_ATTACH_FRAME,
PROP_TRY_ROTATE,
PROP_TRY_FASTER,
PROP_FORMAT,
};
enum
{
BARCODE_FORMAT_ALL,
BARCODE_FORMAT_AZTEC,
BARCODE_FORMAT_CODABAR,
BARCODE_FORMAT_CODE_39,
BARCODE_FORMAT_CODE_93,
BARCODE_FORMAT_CODE_128,
BARCODE_FORMAT_DATA_MATRIX,
BARCODE_FORMAT_EAN_8,
BARCODE_FORMAT_EAN_13,
BARCODE_FORMAT_ITF,
BARCODE_FORMAT_MAXICODE,
BARCODE_FORMAT_PDF_417,
BARCODE_FORMAT_QR_CODE,
BARCODE_FORMAT_RSS_14,
BARCODE_FORMAT_RSS_EXPANDED,
BARCODE_FORMAT_UPC_A,
BARCODE_FORMAT_UPC_E,
BARCODE_FORMAT_UPC_EAN_EXTENSION
};
static const GEnumValue barcode_formats[] = {
{BARCODE_FORMAT_ALL, "ALL", "all"},
{BARCODE_FORMAT_AZTEC, "AZTEC", "aztec"},
{BARCODE_FORMAT_CODABAR, "CODABAR", "codabar"},
{BARCODE_FORMAT_CODE_39, "CODE_39", "code_39"},
{BARCODE_FORMAT_CODE_93, "CODE_93", "code_93"},
{BARCODE_FORMAT_CODE_128, "CODE_128", "code_128"},
{BARCODE_FORMAT_DATA_MATRIX, "PNG", "png"},
{BARCODE_FORMAT_EAN_8, "EAN_8", "ean_8"},
{BARCODE_FORMAT_EAN_13, "EAN_13", "ean_13"},
{BARCODE_FORMAT_ITF, "ITF", "itf"},
{BARCODE_FORMAT_MAXICODE, "MAXICODE", "maxicode"},
{BARCODE_FORMAT_PDF_417, "PDF_417", "pdf_417"},
{BARCODE_FORMAT_QR_CODE, "QR_CODE", "qr_code"},
{BARCODE_FORMAT_RSS_14, "RSS_14", "rss_14"},
{BARCODE_FORMAT_RSS_EXPANDED, "RSS_EXPANDED", "rss_expanded"},
{BARCODE_FORMAT_UPC_A, "UPC_A", "upc_a"},
{BARCODE_FORMAT_UPC_E, "UPC_E", "upc_e"},
{BARCODE_FORMAT_UPC_EAN_EXTENSION, "UPC_EAN_EXTENSION", "upc_ean_expansion"},
{0, NULL, NULL},
};
#define GST_TYPE_BARCODE_FORMAT (gst_barcode_format_get_type())
static GType
gst_barcode_format_get_type (void)
{
static GType barcode_format_type = 0;
if (!barcode_format_type) {
barcode_format_type =
g_enum_register_static ("GstBarCodeFormat", barcode_formats);
}
return barcode_format_type;
}
#define ZXING_YUV_CAPS \
"{ARGB, xRGB, Y444, Y42B, I420, Y41B, YUV9, YV12}"
static GstStaticPadTemplate gst_zxing_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (ZXING_YUV_CAPS))
);
static GstStaticPadTemplate gst_zxing_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE (ZXING_YUV_CAPS))
);
/**
* GstZXing:
*
* Opaque data structure.
*/
struct _GstZXing
{
/*< private > */
GstVideoFilter videofilter;
/* properties */
gboolean message;
gboolean attach_frame;
gboolean rotate;
gboolean faster;
ImageFormat image_format;
guint barcode_format;
};
static void gst_zxing_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_zxing_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_zxing_set_info (GstVideoFilter * vfilter, GstCaps * in,
GstVideoInfo * in_info, GstCaps * out, GstVideoInfo * out_info);
static GstFlowReturn gst_zxing_transform_frame_ip (GstVideoFilter * vfilter,
GstVideoFrame * frame);
#define gst_zxing_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstZXing, gst_zxing,
GST_TYPE_VIDEO_FILTER,
GST_DEBUG_CATEGORY_INIT (zxing_debug, "zxing", 0,
"debug category for zxing element"));
GST_ELEMENT_REGISTER_DEFINE (zxing, "zxing", GST_RANK_MARGINAL, GST_TYPE_ZXING);
static void
gst_zxing_class_init (GstZXingClass * g_class)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstVideoFilterClass *vfilter_class;
gobject_class = G_OBJECT_CLASS (g_class);
gstelement_class = GST_ELEMENT_CLASS (g_class);
vfilter_class = GST_VIDEO_FILTER_CLASS (g_class);
gobject_class->set_property = gst_zxing_set_property;
gobject_class->get_property = gst_zxing_get_property;
g_object_class_install_property (gobject_class, PROP_MESSAGE,
g_param_spec_boolean ("message",
"message", "Post a barcode message for each detected code",
DEFAULT_MESSAGE,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
g_object_class_install_property (gobject_class, PROP_ATTACH_FRAME,
g_param_spec_boolean ("attach-frame", "Attach frame",
"Attach a frame dump to each barcode message",
DEFAULT_ATTACH_FRAME,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
g_object_class_install_property (gobject_class, PROP_TRY_ROTATE,
g_param_spec_boolean ("try-rotate", "Try rotate",
"Try to rotate the frame to detect barcode (slower)",
DEFAULT_TRY_ROTATE,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
g_object_class_install_property (gobject_class, PROP_TRY_FASTER,
g_param_spec_boolean ("try-faster", "Try faster",
"Try faster to analyze the frame", DEFAULT_TRY_FASTER,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
g_object_class_install_property (gobject_class, PROP_FORMAT,
g_param_spec_enum ("format", "barcode format", "Barcode image format",
GST_TYPE_BARCODE_FORMAT, BARCODE_FORMAT_ALL,
(GParamFlags) (G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)));
gst_element_class_set_static_metadata (gstelement_class, "Barcode detector",
"Filter/Analyzer/Video",
"Detect bar codes in the video streams with zxing library",
"Stéphane Cerveau <scerveau@collabora.com>");
gst_element_class_add_static_pad_template (gstelement_class,
&gst_zxing_sink_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_zxing_src_template);
vfilter_class->transform_frame_ip =
GST_DEBUG_FUNCPTR (gst_zxing_transform_frame_ip);
vfilter_class->set_info =
GST_DEBUG_FUNCPTR (gst_zxing_set_info);
}
static void
gst_zxing_init (GstZXing * zxing)
{
zxing->message = DEFAULT_MESSAGE;
zxing->attach_frame = DEFAULT_ATTACH_FRAME;
zxing->rotate = DEFAULT_TRY_ROTATE;
zxing->faster = DEFAULT_TRY_FASTER;
zxing->image_format = ImageFormat::None;
zxing->barcode_format = BARCODE_FORMAT_ALL;
}
static void
gst_zxing_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstZXing *zxing;
g_return_if_fail (GST_IS_ZXING (object));
zxing = GST_ZXING (object);
switch (prop_id) {
case PROP_MESSAGE:
zxing->message = g_value_get_boolean (value);
break;
case PROP_ATTACH_FRAME:
zxing->attach_frame = g_value_get_boolean (value);
break;
case PROP_TRY_ROTATE:
zxing->rotate = g_value_get_boolean (value);
break;
case PROP_TRY_FASTER:
zxing->faster = g_value_get_boolean (value);
break;
case PROP_FORMAT:
zxing->barcode_format = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_zxing_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstZXing *zxing;
g_return_if_fail (GST_IS_ZXING (object));
zxing = GST_ZXING (object);
switch (prop_id) {
case PROP_MESSAGE:
g_value_set_boolean (value, zxing->message);
break;
case PROP_ATTACH_FRAME:
g_value_set_boolean (value, zxing->attach_frame);
break;
case PROP_TRY_ROTATE:
g_value_set_boolean (value, zxing->rotate);
break;
case PROP_TRY_FASTER:
g_value_set_boolean (value, zxing->faster);
break;
case PROP_FORMAT:
g_value_set_enum (value, zxing->barcode_format);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_zxing_set_info (GstVideoFilter * vfilter, GstCaps * in,
GstVideoInfo * in_info, GstCaps * out, GstVideoInfo * out_info)
{
GstZXing *zxing = GST_ZXING (vfilter);
switch (in_info->finfo->format) {
case GST_VIDEO_FORMAT_ARGB:
case GST_VIDEO_FORMAT_xRGB:
zxing->image_format = ImageFormat::XRGB;
break;
case GST_VIDEO_FORMAT_Y444:
case GST_VIDEO_FORMAT_Y42B:
case GST_VIDEO_FORMAT_I420:
case GST_VIDEO_FORMAT_Y41B:
case GST_VIDEO_FORMAT_YUV9:
case GST_VIDEO_FORMAT_YV12:
zxing->image_format = ImageFormat::Lum;
break;
default:
zxing->image_format = ImageFormat::None;
GST_WARNING_OBJECT (zxing, "This format is not supported %s", gst_video_format_to_string(in_info->finfo->format));
}
return TRUE;
}
static GstFlowReturn
gst_zxing_transform_frame_ip (GstVideoFilter * vfilter, GstVideoFrame * frame)
{
GstZXing *zxing = GST_ZXING (vfilter);
gpointer data;
gint height, width;
DecodeHints hints;
hints.setTryRotate(zxing->rotate);
hints.setTryHarder(!zxing->faster);
hints.setFormats(BarcodeFormatFromString (barcode_formats[zxing->barcode_format].value_name));
/* all formats we support start with an 8-bit Y plane. zxing doesn't need
* to know about the chroma plane(s) */
data = GST_VIDEO_FRAME_COMP_DATA (frame, 0);
width = GST_VIDEO_FRAME_WIDTH (frame);
height = GST_VIDEO_FRAME_HEIGHT (frame);
auto result = ReadBarcode ({(unsigned char *)data, width, height, zxing->image_format}, hints);
if (result.isValid ()) {
GST_DEBUG_OBJECT (zxing, "Symbol found. Text: %s Format: %s",
TextUtfEncoding::ToUtf8 (result.text ()).c_str (),
ToString (result.format ()));
} else {
goto out;
}
/* extract results */
if (zxing->message) {
GstMessage *m;
GstStructure *s;
GstSample *sample;
GstCaps *sample_caps;
GstClockTime timestamp, running_time, stream_time;
timestamp = GST_BUFFER_TIMESTAMP (frame->buffer);
running_time =
gst_segment_to_running_time (&GST_BASE_TRANSFORM (zxing)->segment,
GST_FORMAT_TIME, timestamp);
stream_time =
gst_segment_to_stream_time (&GST_BASE_TRANSFORM (zxing)->segment,
GST_FORMAT_TIME, timestamp);
s = gst_structure_new ("barcode",
"timestamp", G_TYPE_UINT64, timestamp,
"stream-time", G_TYPE_UINT64, stream_time,
"running-time", G_TYPE_UINT64, running_time,
"type", G_TYPE_STRING, ToString (result.format ()),
"symbol", G_TYPE_STRING,
TextUtfEncoding::ToUtf8 (result.text ()).c_str (), NULL);
if (zxing->attach_frame) {
/* create a sample from image */
sample_caps = gst_video_info_to_caps (&frame->info);
sample = gst_sample_new (frame->buffer, sample_caps, NULL, NULL);
gst_caps_unref (sample_caps);
gst_structure_set (s, "frame", GST_TYPE_SAMPLE, sample, NULL);
gst_sample_unref (sample);
}
m = gst_message_new_element (GST_OBJECT (zxing), s);
gst_element_post_message (GST_ELEMENT (zxing), m);
} else if (zxing->attach_frame)
GST_WARNING_OBJECT (zxing,
"attach-frame=true has no effect if message=false");
out:
return GST_FLOW_OK;
}