mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-05 07:56:35 +00:00
183 lines
6.2 KiB
C++
183 lines
6.2 KiB
C++
/* GStreamer
|
|
* Copyright (C) <2010> Thiago Santos <thiago.sousa.santos@collabora.co.uk>
|
|
* Copyright (C) <2018> Nicola Murino <nicola.murino@gmail.com>
|
|
*
|
|
* gstopencvutils.c: miscellaneous utility functions
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include "gstopencvutils.h"
|
|
#include <opencv2/core.hpp>
|
|
|
|
/*
|
|
The various opencv image containers or headers store the following information:
|
|
- number of channels (usually 1, 3 or 4)
|
|
- depth (8, 16, 32, 64...); all channels have the same depth.
|
|
The channel layout (BGR vs RGB) is not stored...
|
|
|
|
This gives us the following list of supported image formats:
|
|
CV_8UC1, CV_8UC2, CV_8UC3, CV_8UC4
|
|
CV_8SC1, CV_8SC2, CV_8SC3, CV_8SC4
|
|
CV_16UC1, CV_16UC2, CV_16UC3, CV_16UC4
|
|
CV_16SC1, CV_16SC2, CV_16SC3, CV_16SC4
|
|
CV_32SC1, CV_32SC2, CV_32SC3, CV_32SC4
|
|
CV_32FC1, CV_32FC2, CV_32FC3, CV_32FC4
|
|
CV_64FC1, CV_64FC2, CV_64FC3, CV_64FC4
|
|
|
|
Where the first part of the format name is the depth followed by a digit
|
|
representing the number of channels.
|
|
Note that opencv supports more that 4 channels.
|
|
|
|
The opencv algorithms don't all support all the image types.
|
|
For example findChessboardCorners() supports only 8 bits formats
|
|
(gray scale and color).
|
|
|
|
And, typically, this algorithm will convert the image to gray scale before
|
|
proceeding. It will do so with something like this:
|
|
cvtColor(srcImg, destImg, CV_BGR2GRAY);
|
|
|
|
The conversion will work on any BGR format (BGR, BGRA, BGRx).
|
|
The extra channel(s) will be ignored.
|
|
It will also produce a result for any RGB format.
|
|
The result will be "wrong" to the human eye and might affect some algorithms
|
|
(not findChessboardCorners() afaik...).
|
|
This is due to how RGB gets converted to gray where each color has a
|
|
different weight.
|
|
|
|
Another example is the 2D rendering API.
|
|
It work with RGB but the colors will be wrong.
|
|
|
|
Likewise other layouts like xBGR and ABGR formats will probably misbehave
|
|
with most algorithms.
|
|
|
|
The bad thing is that it is not possible to change the "default" BGR format.
|
|
Safest is to not assume that RGB will work and always convert to BGR.
|
|
|
|
That said, the current opencv gstreamer elements all accept BGR and RGB caps !
|
|
Some have restrictions but if a format is supported then both BGR and RGB
|
|
layouts will be supported.
|
|
*/
|
|
|
|
gboolean gst_opencv_parse_cv_mat_params_from_caps
|
|
(GstCaps * caps, gint * width, gint * height, int *cv_type, GError ** err)
|
|
{
|
|
GstVideoInfo info;
|
|
gchar *caps_str;
|
|
|
|
if (!gst_video_info_from_caps (&info, caps)) {
|
|
caps_str = gst_caps_to_string (caps);
|
|
GST_ERROR ("Failed to get video info from caps %s", caps_str);
|
|
g_set_error (err, GST_CORE_ERROR, GST_CORE_ERROR_NEGOTIATION,
|
|
"Failed to get video info from caps %s", caps_str);
|
|
g_free (caps_str);
|
|
return FALSE;
|
|
}
|
|
|
|
return gst_opencv_cv_mat_params_from_video_info (&info, width, height,
|
|
cv_type, err);
|
|
}
|
|
|
|
gboolean gst_opencv_cv_mat_params_from_video_info
|
|
(GstVideoInfo * info, gint * width, gint * height, int *cv_type,
|
|
GError ** err)
|
|
{
|
|
GstVideoFormat format;
|
|
|
|
format = GST_VIDEO_INFO_FORMAT (info);
|
|
if (!gst_opencv_cv_image_type_from_video_format (format, cv_type, err)) {
|
|
return FALSE;
|
|
}
|
|
|
|
*width = GST_VIDEO_INFO_WIDTH (info);
|
|
*height = GST_VIDEO_INFO_HEIGHT (info);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
gboolean
|
|
gst_opencv_cv_image_type_from_video_format (GstVideoFormat format,
|
|
int *cv_type, GError ** err)
|
|
{
|
|
const gchar *format_str;
|
|
|
|
switch (format) {
|
|
case GST_VIDEO_FORMAT_GRAY8:
|
|
*cv_type = CV_8UC1;
|
|
break;
|
|
case GST_VIDEO_FORMAT_RGB:
|
|
case GST_VIDEO_FORMAT_BGR:
|
|
*cv_type = CV_8UC3;
|
|
break;
|
|
case GST_VIDEO_FORMAT_RGBx:
|
|
case GST_VIDEO_FORMAT_xRGB:
|
|
case GST_VIDEO_FORMAT_BGRx:
|
|
case GST_VIDEO_FORMAT_xBGR:
|
|
case GST_VIDEO_FORMAT_RGBA:
|
|
case GST_VIDEO_FORMAT_ARGB:
|
|
case GST_VIDEO_FORMAT_BGRA:
|
|
case GST_VIDEO_FORMAT_ABGR:
|
|
*cv_type = CV_8UC4;
|
|
break;
|
|
case GST_VIDEO_FORMAT_GRAY16_LE:
|
|
case GST_VIDEO_FORMAT_GRAY16_BE:
|
|
*cv_type = CV_16UC1;
|
|
break;
|
|
default:
|
|
format_str = gst_video_format_to_string (format);
|
|
g_set_error (err, GST_CORE_ERROR, GST_CORE_ERROR_NEGOTIATION,
|
|
"Unsupported video format %s", format_str);
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
GstCaps *
|
|
gst_opencv_caps_from_cv_image_type (int cv_type)
|
|
{
|
|
GstCaps *c = gst_caps_new_empty ();
|
|
switch (cv_type) {
|
|
case CV_8UC1:
|
|
gst_caps_append (c, gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("GRAY8")));
|
|
break;
|
|
case CV_8UC3:
|
|
gst_caps_append (c, gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("RGB")));
|
|
gst_caps_append (c, gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("BGR")));
|
|
break;
|
|
case CV_8UC4:
|
|
gst_caps_append (c, gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("RGBx")));
|
|
gst_caps_append (c, gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("xRGB")));
|
|
gst_caps_append (c, gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("BGRx")));
|
|
gst_caps_append (c, gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("xBGR")));
|
|
gst_caps_append (c, gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("RGBA")));
|
|
gst_caps_append (c, gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("ARGB")));
|
|
gst_caps_append (c, gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("BGRA")));
|
|
gst_caps_append (c, gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("ABGR")));
|
|
break;
|
|
case CV_16UC1:
|
|
gst_caps_append (c,
|
|
gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("GRAY16_LE")));
|
|
gst_caps_append (c,
|
|
gst_caps_from_string (GST_VIDEO_CAPS_MAKE ("GRAY16_BE")));
|
|
break;
|
|
}
|
|
return c;
|
|
}
|