gstreamer/ext/qroverlay/gstbaseqroverlay.c

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/*
* GStreamer
* Copyright (C) 2006 Stefan Kost <ensonic@users.sf.net>
* Copyright (c) 2020 Anthony Violo <anthony.violo@ubicast.eu>
* Copyright (c) 2020 Thibault Saunier <tsaunier@igalia.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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* plugin-qroverlay
*
* Since: 1.20
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>
#include <json-glib/json-glib.h>
#include <qrencode.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "gstbaseqroverlay.h"
GST_DEBUG_CATEGORY_STATIC (gst_base_qr_overlay_debug);
#define GST_CAT_DEFAULT gst_base_qr_overlay_debug
enum
{
PROP_0,
PROP_X_AXIS,
PROP_Y_AXIS,
PROP_PIXEL_SIZE,
PROP_QRCODE_ERROR_CORRECTION,
};
typedef struct _GstBaseQROverlayPrivate GstBaseQROverlayPrivate;
struct _GstBaseQROverlayPrivate
{
gfloat qrcode_size;
guint qrcode_quality;
guint span_frame;
QRecLevel level;
gfloat x_percent;
gfloat y_percent;
GstElement *overlaycomposition;
GstVideoInfo info;
gboolean valid;
GstPad *sinkpad, *srcpad;
GstVideoOverlayComposition *prev_overlay;
};
#define PRIV(s) gst_base_qr_overlay_get_instance_private (GST_BASE_QR_OVERLAY (s))
#define OVERLAY_COMPOSITION_CAPS GST_VIDEO_CAPS_MAKE (GST_VIDEO_OVERLAY_COMPOSITION_BLEND_FORMATS)
#define ALL_CAPS OVERLAY_COMPOSITION_CAPS ";" \
GST_VIDEO_CAPS_MAKE_WITH_FEATURES ("ANY", GST_VIDEO_FORMATS_ALL)
static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (ALL_CAPS)
);
static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (ALL_CAPS)
);
#define DEFAULT_PROP_QUALITY 1
#define DEFAULT_PROP_PIXEL_SIZE 3
#define GST_TYPE_QRCODE_QUALITY (gst_qrcode_quality_get_type())
static GType
gst_qrcode_quality_get_type (void)
{
static GType qrcode_quality_type = 0;
static const GEnumValue qrcode_quality[] = {
{0, "Level L", "Approx 7%"},
{1, "Level M", "Approx 15%"},
{2, "Level Q", "Approx 25%"},
{3, "Level H", "Approx 30%"},
{0, NULL, NULL},
};
if (!qrcode_quality_type) {
qrcode_quality_type =
g_enum_register_static ("GstQrcodeOverlayCorrection", qrcode_quality);
}
return qrcode_quality_type;
}
#define gst_base_qr_overlay_parent_class parent_class
G_DEFINE_TYPE_WITH_PRIVATE (GstBaseQROverlay, gst_base_qr_overlay,
GST_TYPE_BIN);
static void gst_base_qr_overlay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_base_qr_overlay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void
gst_base_qr_overlay_caps_changed_cb (GstBaseQROverlay * self, GstCaps * caps,
gint window_width, gint window_height, GstElement * overlay)
{
GstBaseQROverlayPrivate *priv = PRIV (self);
if (gst_video_info_from_caps (&priv->info, caps))
priv->valid = TRUE;
else
priv->valid = FALSE;
}
static GstVideoOverlayComposition *
draw_overlay (GstBaseQROverlay * self, QRcode * qrcode)
{
guint8 *qr_data, *pixels;
gint stride, pstride, y, x, yy, square_size;
gsize offset, line_offset;
GstVideoInfo info;
GstVideoOverlayRectangle *rect;
GstVideoOverlayComposition *comp;
GstBuffer *buf;
GstBaseQROverlayPrivate *priv = PRIV (self);
gst_video_info_init (&info);
square_size = (qrcode->width + 4 * 2) * priv->qrcode_size;
gst_video_info_set_format (&info, GST_VIDEO_FORMAT_ARGB, square_size,
square_size);
pixels = g_malloc ((size_t) info.size);
stride = info.stride[0];
pstride = info.finfo->pixel_stride[0];
/* White background */
for (y = 0; y < info.height; y++)
memset (&pixels[y * stride], 0xff, stride);
/* Draw the black QR code blocks with 4px white space around it
* on top */
line_offset = 4 * priv->qrcode_size * stride;
qr_data = qrcode->data;
for (y = 0; y < qrcode->width; y++) {
for (x = 0; x < (qrcode->width); x++) {
for (yy = 0; yy < priv->qrcode_size * pstride; yy += pstride) {
if (!(*qr_data & 1))
continue;
offset =
(((line_offset + (stride * (yy / pstride))) +
x * priv->qrcode_size * pstride)) +
(priv->qrcode_size * pstride) + (4 * priv->qrcode_size * pstride);
for (gint i = 0; i < priv->qrcode_size * pstride; i += pstride) {
pixels[offset + i] = 0x00;
pixels[offset + i + 1] = 0x00;
pixels[offset + i + 2] = 0x00;
}
}
qr_data++;
}
line_offset += (stride * priv->qrcode_size);
}
buf = gst_buffer_new_wrapped (pixels, info.size);
gst_buffer_add_video_meta (buf, GST_VIDEO_FRAME_FLAG_NONE,
GST_VIDEO_OVERLAY_COMPOSITION_FORMAT_RGB, info.width, info.height);
x = (int) (priv->info.width - square_size) * (priv->x_percent / 100);
x = GST_ROUND_DOWN_2 (x);
y = (int) (priv->info.height - square_size) * (priv->y_percent / 100);
y = GST_ROUND_DOWN_4 (y);
rect = gst_video_overlay_rectangle_new_raw (buf, x, y,
info.width, info.height, GST_VIDEO_OVERLAY_FORMAT_FLAG_NONE);
comp = gst_video_overlay_composition_new (rect);
gst_video_overlay_rectangle_unref (rect);
return comp;
}
static GstVideoOverlayComposition *
gst_base_qr_overlay_draw_cb (GstBaseQROverlay * self, GstSample * sample,
GstElement * _)
{
GstBaseQROverlayPrivate *priv = PRIV (self);
QRcode *qrcode;
gchar *content;
gboolean reuse_previous = FALSE;
GstVideoOverlayComposition *overlay = NULL;
GstBuffer *buffer = gst_sample_get_buffer (sample);
GstSegment *segment = gst_sample_get_segment (sample);
GstClockTime rtime = gst_segment_to_running_time (segment, GST_FORMAT_TIME,
GST_BUFFER_PTS (buffer));
if (!priv->valid) {
GST_ERROR_OBJECT (self, "Trying to draw before negotiation?");
return NULL;
}
if (GST_CLOCK_TIME_IS_VALID (rtime))
gst_object_sync_values (GST_OBJECT (self), rtime);
content =
GST_BASE_QR_OVERLAY_GET_CLASS (self)->get_content (GST_BASE_QR_OVERLAY
(self), buffer, &priv->info, &reuse_previous);
if (reuse_previous && priv->prev_overlay) {
overlay = gst_video_overlay_composition_ref (priv->prev_overlay);
} else if (content) {
GST_INFO_OBJECT (self, "String will be encoded : %s", content);
qrcode =
QRcode_encodeString (content, 0, priv->qrcode_quality, QR_MODE_8, 0);
if (qrcode) {
GST_DEBUG_OBJECT (self, "String encoded");
overlay = draw_overlay (GST_BASE_QR_OVERLAY (self), qrcode);
gst_mini_object_replace (((GstMiniObject **) & priv->prev_overlay),
(GstMiniObject *) overlay);
} else {
GST_WARNING_OBJECT (self, "Could not encode content: %s", content);
}
}
g_free (content);
return overlay;
}
/* GObject vmethod implementations */
static void
gst_base_qr_overlay_dispose (GObject * object)
{
GstBaseQROverlayPrivate *priv = PRIV (object);
gst_mini_object_replace (((GstMiniObject **) & priv->prev_overlay), NULL);
}
/* initialize the qroverlay's class */
static void
gst_base_qr_overlay_class_init (GstBaseQROverlayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class->set_property = gst_base_qr_overlay_set_property;
gobject_class->get_property = gst_base_qr_overlay_get_property;
gobject_class->dispose = gst_base_qr_overlay_dispose;
GST_DEBUG_CATEGORY_INIT (gst_base_qr_overlay_debug, "qroverlay", 0,
"Qrcode overlay base class");
g_object_class_install_property (gobject_class,
PROP_X_AXIS, g_param_spec_float ("x",
"X position (in percent of the width)",
"X position (in percent of the width)",
0.0, 100.0, 50.0, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_Y_AXIS, g_param_spec_float ("y",
"Y position (in percent of the height)",
"Y position (in percent of the height)",
0.0, 100.0, 50.0, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class,
PROP_PIXEL_SIZE, g_param_spec_float ("pixel-size",
"pixel-size", "Pixel size of each Qrcode pixel",
1, 100.0, DEFAULT_PROP_PIXEL_SIZE, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_QRCODE_ERROR_CORRECTION,
g_param_spec_enum ("qrcode-error-correction", "qrcode-error-correction",
"qrcode-error-correction", GST_TYPE_QRCODE_QUALITY,
DEFAULT_PROP_QUALITY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&src_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sink_template));
gst_type_mark_as_plugin_api (GST_TYPE_QRCODE_QUALITY, 0);
gst_type_mark_as_plugin_api (GST_TYPE_QRCODE_QUALITY, 0);
}
/* initialize the new element
* initialize instance structure
*/
static void
gst_base_qr_overlay_init (GstBaseQROverlay * self)
{
GstBaseQROverlayPrivate *priv = PRIV (self);
priv->x_percent = 50.0;
priv->y_percent = 50.0;
priv->qrcode_quality = DEFAULT_PROP_QUALITY;
priv->span_frame = 0;
priv->qrcode_size = DEFAULT_PROP_PIXEL_SIZE;
priv->overlaycomposition =
gst_element_factory_make ("overlaycomposition", NULL);
gst_video_info_init (&priv->info);
if (priv->overlaycomposition) {
GstPadTemplate *sink_tmpl = gst_static_pad_template_get (&sink_template);
GstPadTemplate *src_tmpl = gst_static_pad_template_get (&src_template);
gst_bin_add (GST_BIN (self), priv->overlaycomposition);
gst_element_add_pad (GST_ELEMENT_CAST (self),
gst_ghost_pad_new_from_template ("sink",
priv->overlaycomposition->sinkpads->data, sink_tmpl));
gst_element_add_pad (GST_ELEMENT_CAST (self),
gst_ghost_pad_new_from_template ("src",
priv->overlaycomposition->srcpads->data, src_tmpl));
gst_object_unref (sink_tmpl);
gst_object_unref (src_tmpl);
g_signal_connect_swapped (priv->overlaycomposition, "draw",
G_CALLBACK (gst_base_qr_overlay_draw_cb), self);
g_signal_connect_swapped (priv->overlaycomposition, "caps-changed",
G_CALLBACK (gst_base_qr_overlay_caps_changed_cb), self);
}
}
static void
gst_base_qr_overlay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstBaseQROverlayPrivate *priv = PRIV (object);
switch (prop_id) {
case PROP_X_AXIS:
priv->x_percent = g_value_get_float (value);
break;
case PROP_Y_AXIS:
priv->y_percent = g_value_get_float (value);
break;
case PROP_PIXEL_SIZE:
priv->qrcode_size = g_value_get_float (value);
break;
case PROP_QRCODE_ERROR_CORRECTION:
priv->qrcode_quality = g_value_get_enum (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_base_qr_overlay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstBaseQROverlayPrivate *priv = PRIV (object);
switch (prop_id) {
case PROP_X_AXIS:
g_value_set_float (value, priv->x_percent);
break;
case PROP_Y_AXIS:
g_value_set_float (value, priv->y_percent);
break;
case PROP_PIXEL_SIZE:
g_value_set_float (value, priv->qrcode_size);
break;
case PROP_QRCODE_ERROR_CORRECTION:
g_value_set_enum (value, priv->qrcode_quality);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}