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128 lines
3.8 KiB
C
128 lines
3.8 KiB
C
/* GStreamer JPEG 2000 Sampling
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* Copyright (C) <2016> Grok Image Compression Inc.
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* @author Aaron Boxer <boxerab@gmail.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:gstjpeg2000sampling
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* @title: GstJpeg2000Sampling
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* @short_description: Manage JPEG 2000 sampling and colorspace fields
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*
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*/
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#include "gstjpeg2000sampling.h"
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/* string values corresponding to GstJPEG2000Sampling enums */
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static const gchar *gst_jpeg2000_sampling_strings[] = {
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"RGB",
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"BGR",
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"RGBA",
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"BGRA",
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"YCbCr-4:4:4",
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"YCbCr-4:2:2",
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"YCbCr-4:2:0",
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"YCbCr-4:1:0",
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"GRAYSCALE",
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"YCbCrA-4:4:4:4",
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};
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/* convert string to GstJPEG2000Sampling enum */
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GstJPEG2000Sampling
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gst_jpeg2000_sampling_from_string (const gchar * sampling_string)
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{
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GstJPEG2000Sampling i;
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if (sampling_string == NULL)
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return GST_JPEG2000_SAMPLING_NONE;
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for (i = 0; i < G_N_ELEMENTS (gst_jpeg2000_sampling_strings); ++i) {
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if (!g_strcmp0 (sampling_string, gst_jpeg2000_sampling_strings[i]))
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return (i + 1);
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}
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return GST_JPEG2000_SAMPLING_NONE;
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}
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/* convert GstJPEG2000Sampling enum to string */
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const gchar *
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gst_jpeg2000_sampling_to_string (GstJPEG2000Sampling sampling)
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{
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g_return_val_if_fail (sampling > 0
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&& sampling <= G_N_ELEMENTS (gst_jpeg2000_sampling_strings), NULL);
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return gst_jpeg2000_sampling_strings[sampling - 1];
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}
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/* check if @sampling is in RGB color space */
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gboolean
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gst_jpeg2000_sampling_is_rgb (GstJPEG2000Sampling sampling)
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{
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return sampling == GST_JPEG2000_SAMPLING_RGB ||
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sampling == GST_JPEG2000_SAMPLING_RGBA ||
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sampling == GST_JPEG2000_SAMPLING_BGR
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|| sampling == GST_JPEG2000_SAMPLING_BGRA;
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}
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/* check if @sampling is in YUV color space */
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gboolean
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gst_jpeg2000_sampling_is_yuv (GstJPEG2000Sampling sampling)
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{
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return sampling == GST_JPEG2000_SAMPLING_YBRA4444_EXT ||
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sampling == GST_JPEG2000_SAMPLING_YBR444 ||
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sampling == GST_JPEG2000_SAMPLING_YBR422 ||
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sampling == GST_JPEG2000_SAMPLING_YBR420
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|| sampling == GST_JPEG2000_SAMPLING_YBR410;
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}
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/* check if @sampling is in GRAYSCALE color space */
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gboolean
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gst_jpeg2000_sampling_is_mono (GstJPEG2000Sampling sampling)
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{
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return sampling == GST_JPEG2000_SAMPLING_GRAYSCALE;
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}
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/* string values corresponding to GstJPEG2000Colorspace enums */
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static const gchar *gst_jpeg2000_colorspace_strings[] = {
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"sRGB",
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"sYUV",
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"GRAY",
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};
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/* convert GstJPEG2000Colorspace enum to string */
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GstJPEG2000Colorspace
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gst_jpeg2000_colorspace_from_string (const gchar * colorspace_string)
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{
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GstJPEG2000Colorspace i;
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g_return_val_if_fail (colorspace_string != NULL,
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GST_JPEG2000_COLORSPACE_NONE);
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for (i = 0; i < G_N_ELEMENTS (gst_jpeg2000_colorspace_strings); ++i) {
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if (!g_strcmp0 (colorspace_string, gst_jpeg2000_colorspace_strings[i]))
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return (i + 1);
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}
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return GST_JPEG2000_COLORSPACE_NONE;
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}
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/* convert string to GstJPEG2000Colorspace enum */
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const gchar *
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gst_jpeg2000_colorspace_to_string (GstJPEG2000Colorspace colorspace)
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{
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g_return_val_if_fail (colorspace > GST_JPEG2000_COLORSPACE_NONE
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&& colorspace <= G_N_ELEMENTS (gst_jpeg2000_colorspace_strings), NULL);
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return gst_jpeg2000_colorspace_strings[colorspace - 1];
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}
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