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410efd196a
We've been allowing only a few known chroma-site values such as jpeg (not co-sited), mpeg2 (horizontally co-sited) and dv (co-sited on alternate lines). That's insufficient for representing all possible chroma-site values. By this commit, we can represent any combination of chroma-site flags. But, an exception here is that any combination with GST_VIDEO_CHROMA_SITE_NONE will be considered as invalid value. For any combination of chroma-site flags, gst_video_chroma_to_string() method is deprecated in order to return newly allocated string via a new gst_video_chroma_site_to_string() method. And for consistent API naming, gst_video_chroma_from_string() is also deprecated. Newly written code should use gst_video_chroma_site_from_string() instead. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/927>
119 lines
4.5 KiB
C
119 lines
4.5 KiB
C
/* GStreamer
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* Copyright (C) <2013> Wim Taymans <wim.taymans@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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#ifndef __GST_VIDEO_CHROMA_H__
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#define __GST_VIDEO_CHROMA_H__
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#include <gst/gst.h>
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#include <gst/video/video-prelude.h>
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G_BEGIN_DECLS
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/**
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* GstVideoChromaSite:
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* @GST_VIDEO_CHROMA_SITE_UNKNOWN: unknown cositing
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* @GST_VIDEO_CHROMA_SITE_NONE: no cositing
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* @GST_VIDEO_CHROMA_SITE_H_COSITED: chroma is horizontally cosited
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* @GST_VIDEO_CHROMA_SITE_V_COSITED: chroma is vertically cosited
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* @GST_VIDEO_CHROMA_SITE_ALT_LINE: choma samples are sited on alternate lines
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* @GST_VIDEO_CHROMA_SITE_COSITED: chroma samples cosited with luma samples
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* @GST_VIDEO_CHROMA_SITE_JPEG: jpeg style cositing, also for mpeg1 and mjpeg
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* @GST_VIDEO_CHROMA_SITE_MPEG2: mpeg2 style cositing
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* @GST_VIDEO_CHROMA_SITE_DV: DV style cositing
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*
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* Various Chroma sitings.
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*/
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typedef enum {
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GST_VIDEO_CHROMA_SITE_UNKNOWN = 0,
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GST_VIDEO_CHROMA_SITE_NONE = (1 << 0),
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GST_VIDEO_CHROMA_SITE_H_COSITED = (1 << 1),
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GST_VIDEO_CHROMA_SITE_V_COSITED = (1 << 2),
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GST_VIDEO_CHROMA_SITE_ALT_LINE = (1 << 3),
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/* some common chroma cositing */
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GST_VIDEO_CHROMA_SITE_COSITED = (GST_VIDEO_CHROMA_SITE_H_COSITED | GST_VIDEO_CHROMA_SITE_V_COSITED),
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GST_VIDEO_CHROMA_SITE_JPEG = (GST_VIDEO_CHROMA_SITE_NONE),
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GST_VIDEO_CHROMA_SITE_MPEG2 = (GST_VIDEO_CHROMA_SITE_H_COSITED),
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GST_VIDEO_CHROMA_SITE_DV = (GST_VIDEO_CHROMA_SITE_COSITED | GST_VIDEO_CHROMA_SITE_ALT_LINE),
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} GstVideoChromaSite;
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GST_VIDEO_DEPRECATED_FOR(gst_video_chroma_site_from_string)
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GstVideoChromaSite gst_video_chroma_from_string (const gchar * s);
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GST_VIDEO_DEPRECATED_FOR(gst_video_chroma_site_to_string)
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const gchar * gst_video_chroma_to_string (GstVideoChromaSite site);
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GST_VIDEO_API
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GstVideoChromaSite gst_video_chroma_site_from_string (const gchar * s);
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GST_VIDEO_API
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gchar * gst_video_chroma_site_to_string (GstVideoChromaSite site);
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/**
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* GstVideoChromaMethod:
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* @GST_VIDEO_CHROMA_METHOD_NEAREST: Duplicates the chroma samples when
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* upsampling and drops when subsampling
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* @GST_VIDEO_CHROMA_METHOD_LINEAR: Uses linear interpolation to reconstruct
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* missing chroma and averaging to subsample
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*
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* Different subsampling and upsampling methods
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*/
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typedef enum {
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GST_VIDEO_CHROMA_METHOD_NEAREST,
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GST_VIDEO_CHROMA_METHOD_LINEAR
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} GstVideoChromaMethod;
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/**
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* GstVideoChromaFlags:
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* @GST_VIDEO_CHROMA_FLAG_NONE: no flags
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* @GST_VIDEO_CHROMA_FLAG_INTERLACED: the input is interlaced
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*
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* Extra flags that influence the result from gst_video_chroma_resample_new().
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*/
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typedef enum {
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GST_VIDEO_CHROMA_FLAG_NONE = 0,
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GST_VIDEO_CHROMA_FLAG_INTERLACED = (1 << 0),
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} GstVideoChromaFlags;
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typedef struct _GstVideoChromaResample GstVideoChromaResample;
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/* circular dependency, need to include this after defining the enums */
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#include <gst/video/video-format.h>
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GST_VIDEO_API
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GstVideoChromaResample * gst_video_chroma_resample_new (GstVideoChromaMethod method,
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GstVideoChromaSite site,
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GstVideoChromaFlags flags,
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GstVideoFormat format,
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gint h_factor, gint v_factor);
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GST_VIDEO_API
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void gst_video_chroma_resample_free (GstVideoChromaResample *resample);
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GST_VIDEO_API
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void gst_video_chroma_resample_get_info (GstVideoChromaResample *resample,
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guint * n_lines, gint *offset);
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GST_VIDEO_API
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void gst_video_chroma_resample (GstVideoChromaResample *resample,
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gpointer lines[], gint width);
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G_END_DECLS
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#endif /* __GST_VIDEO_CHROMA_H__ */
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