1 /* GStreamer JPEG 2000 Sampling
2 * Copyright (C) <2016> Grok Image Compression Inc.
3 * @author Aaron Boxer <boxerab@gmail.com>
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 */
20
21 /**
22 * SECTION:gstjpeg2000sampling
23 * @title: GstJpeg2000Sampling
24 * @short_description: Manage JPEG 2000 sampling and colorspace fields
25 *
26 */
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #include "gstjpeg2000sampling.h"
32
33 /* string values corresponding to GstJPEG2000Sampling enums */
34 static const gchar *gst_jpeg2000_sampling_strings[] = {
35 "RGB",
36 "BGR",
37 "RGBA",
38 "BGRA",
39 "YCbCr-4:4:4",
40 "YCbCr-4:2:2",
41 "YCbCr-4:2:0",
42 "YCbCr-4:1:0",
43 "GRAYSCALE",
44 "YCbCrA-4:4:4:4",
45 "YCbCr-4:1:1",
46 };
47
48 /* convert string to GstJPEG2000Sampling enum */
49 GstJPEG2000Sampling
gst_jpeg2000_sampling_from_string(const gchar * sampling_string)50 gst_jpeg2000_sampling_from_string (const gchar * sampling_string)
51 {
52 GstJPEG2000Sampling i;
53 if (sampling_string == NULL)
54 return GST_JPEG2000_SAMPLING_NONE;
55 for (i = 0; i < G_N_ELEMENTS (gst_jpeg2000_sampling_strings); ++i) {
56 if (!g_strcmp0 (sampling_string, gst_jpeg2000_sampling_strings[i]))
57 return (i + 1);
58 }
59 return GST_JPEG2000_SAMPLING_NONE;
60
61
62 }
63
64 /* convert GstJPEG2000Sampling enum to string */
65 const gchar *
gst_jpeg2000_sampling_to_string(GstJPEG2000Sampling sampling)66 gst_jpeg2000_sampling_to_string (GstJPEG2000Sampling sampling)
67 {
68 g_return_val_if_fail (sampling > 0
69 && sampling <= G_N_ELEMENTS (gst_jpeg2000_sampling_strings), NULL);
70 return gst_jpeg2000_sampling_strings[sampling - 1];
71 }
72
73 /* check if @sampling is in RGB color space */
74 gboolean
gst_jpeg2000_sampling_is_rgb(GstJPEG2000Sampling sampling)75 gst_jpeg2000_sampling_is_rgb (GstJPEG2000Sampling sampling)
76 {
77 return sampling == GST_JPEG2000_SAMPLING_RGB ||
78 sampling == GST_JPEG2000_SAMPLING_RGBA ||
79 sampling == GST_JPEG2000_SAMPLING_BGR
80 || sampling == GST_JPEG2000_SAMPLING_BGRA;
81 }
82
83 /* check if @sampling is in YUV color space */
84 gboolean
gst_jpeg2000_sampling_is_yuv(GstJPEG2000Sampling sampling)85 gst_jpeg2000_sampling_is_yuv (GstJPEG2000Sampling sampling)
86 {
87 return sampling == GST_JPEG2000_SAMPLING_YBRA4444_EXT ||
88 sampling == GST_JPEG2000_SAMPLING_YBR444 ||
89 sampling == GST_JPEG2000_SAMPLING_YBR422 ||
90 sampling == GST_JPEG2000_SAMPLING_YBR420 ||
91 sampling == GST_JPEG2000_SAMPLING_YBR411 ||
92 sampling == GST_JPEG2000_SAMPLING_YBR410;
93 }
94
95 /* check if @sampling is in GRAYSCALE color space */
96 gboolean
gst_jpeg2000_sampling_is_mono(GstJPEG2000Sampling sampling)97 gst_jpeg2000_sampling_is_mono (GstJPEG2000Sampling sampling)
98 {
99 return sampling == GST_JPEG2000_SAMPLING_GRAYSCALE;
100 }
101
102 /* string values corresponding to GstJPEG2000Colorspace enums */
103 static const gchar *gst_jpeg2000_colorspace_strings[] = {
104 "sRGB",
105 "sYUV",
106 "GRAY",
107 };
108
109 /* convert GstJPEG2000Colorspace enum to string */
110 GstJPEG2000Colorspace
gst_jpeg2000_colorspace_from_string(const gchar * colorspace_string)111 gst_jpeg2000_colorspace_from_string (const gchar * colorspace_string)
112 {
113 GstJPEG2000Colorspace i;
114
115 g_return_val_if_fail (colorspace_string != NULL,
116 GST_JPEG2000_COLORSPACE_NONE);
117
118 for (i = 0; i < G_N_ELEMENTS (gst_jpeg2000_colorspace_strings); ++i) {
119 if (!g_strcmp0 (colorspace_string, gst_jpeg2000_colorspace_strings[i]))
120 return (i + 1);
121 }
122 return GST_JPEG2000_COLORSPACE_NONE;
123 }
124
125 /* convert string to GstJPEG2000Colorspace enum */
126 const gchar *
gst_jpeg2000_colorspace_to_string(GstJPEG2000Colorspace colorspace)127 gst_jpeg2000_colorspace_to_string (GstJPEG2000Colorspace colorspace)
128 {
129 g_return_val_if_fail (colorspace > GST_JPEG2000_COLORSPACE_NONE
130 && colorspace <= G_N_ELEMENTS (gst_jpeg2000_colorspace_strings), NULL);
131
132 return gst_jpeg2000_colorspace_strings[colorspace - 1];
133 }
134