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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>GstVideoChromaResample: GStreamer Base Plugins 1.0 Library Reference Manual</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
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<link rel="home" href="index.html" title="GStreamer Base Plugins 1.0 Library Reference Manual">
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<link rel="up" href="gstreamer-video.html" title="Video Library">
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<link rel="prev" href="gst-plugins-base-libs-GstVideoDither.html" title="GstVideoDither">
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<link rel="next" href="gst-plugins-base-libs-GstVideoResampler.html" title="GstVideoResampler">
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<meta name="generator" content="GTK-Doc V1.27 (XML mode)">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Top |
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Description
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GstVideoChromaResample
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GstVideoChromaResample — Functions and utility object for operating on chroma video planes
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Functions
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GstVideoChromaSite
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gst_video_chroma_from_string ()
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const gchar *
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gst_video_chroma_to_string ()
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void
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gst_video_chroma_resample ()
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void
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gst_video_chroma_resample_free ()
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void
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gst_video_chroma_resample_get_info ()
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GstVideoChromaResample *
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gst_video_chroma_resample_new ()
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Types and Values
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enum
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GstVideoChromaSite
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enum
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GstVideoChromaFlags
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enum
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GstVideoChromaMethod
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GstVideoChromaResample
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Includes
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#include <gst/video/video-chroma.h>
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Description
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The functions gst_video_chroma_from_string() and gst_video_chroma_to_string() convert
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between GstVideoChromaSite and string descriptions.
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GstVideoChromaResample is a utility object for resampling chroma planes
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and converting between different chroma sampling sitings.
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Functions
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gst_video_chroma_from_string ()
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GstVideoChromaSite
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gst_video_chroma_from_string (const gchar *s);
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Convert s
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to a GstVideoChromaSite
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Parameters
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s
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a chromasite string
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Returns
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a GstVideoChromaSite or GST_VIDEO_CHROMA_SITE_UNKNOWN when s
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does
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not contain a valid chroma description.
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gst_video_chroma_to_string ()
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const gchar *
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gst_video_chroma_to_string (GstVideoChromaSite site);
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Converts site
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to its string representation.
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Parameters
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site
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a GstVideoChromaSite
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Returns
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a string describing site
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gst_video_chroma_resample ()
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void
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gst_video_chroma_resample (GstVideoChromaResample *resample,
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gpointer lines[],
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gint width);
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Perform resampling of width
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chroma pixels in lines
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Parameters
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resample
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a GstVideoChromaResample
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lines
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pixel lines
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width
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the number of pixels on one line
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gst_video_chroma_resample_free ()
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void
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gst_video_chroma_resample_free (GstVideoChromaResample *resample);
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Free resample
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Parameters
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resample
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a GstVideoChromaResample
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gst_video_chroma_resample_get_info ()
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void
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gst_video_chroma_resample_get_info (GstVideoChromaResample *resample,
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guint *n_lines,
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gint *offset);
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The resampler must be fed n_lines
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at a time. The first line should be
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at offset
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.
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Parameters
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resample
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a GstVideoChromaResample
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n_lines
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the number of input lines
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offset
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the first line
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gst_video_chroma_resample_new ()
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GstVideoChromaResample *
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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,
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gint v_factor);
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Create a new resampler object for the given parameters. When h_factor
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or
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v_factor
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is > 0, upsampling will be used, otherwise subsampling is
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performed.
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[skip]
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Parameters
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method
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a GstVideoChromaMethod
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site
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a GstVideoChromaSite
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flags
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GstVideoChromaFlags
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format
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the GstVideoFormat
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h_factor
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horizontal resampling factor
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v_factor
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vertical resampling factor
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Returns
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a new GstVideoChromaResample that should be freed with
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gst_video_chroma_resample_free() after usage.
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Types and Values
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enum GstVideoChromaSite
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Various Chroma sitings.
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Members
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GST_VIDEO_CHROMA_SITE_UNKNOWN
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unknown cositing
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GST_VIDEO_CHROMA_SITE_NONE
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no cositing
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GST_VIDEO_CHROMA_SITE_H_COSITED
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chroma is horizontally cosited
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GST_VIDEO_CHROMA_SITE_V_COSITED
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chroma is vertically cosited
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GST_VIDEO_CHROMA_SITE_ALT_LINE
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choma samples are sited on alternate lines
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GST_VIDEO_CHROMA_SITE_COSITED
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chroma samples cosited with luma samples
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GST_VIDEO_CHROMA_SITE_JPEG
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jpeg style cositing, also for mpeg1 and mjpeg
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GST_VIDEO_CHROMA_SITE_MPEG2
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mpeg2 style cositing
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GST_VIDEO_CHROMA_SITE_DV
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DV style cositing
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enum GstVideoChromaFlags
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Extra flags that influence the result from gst_video_chroma_resample_new().
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Members
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GST_VIDEO_CHROMA_FLAG_NONE
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no flags
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GST_VIDEO_CHROMA_FLAG_INTERLACED
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the input is interlaced
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enum GstVideoChromaMethod
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Different subsampling and upsampling methods
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Members
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GST_VIDEO_CHROMA_METHOD_NEAREST
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Duplicates the chroma samples when
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upsampling and drops when subsampling
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GST_VIDEO_CHROMA_METHOD_LINEAR
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Uses linear interpolation to reconstruct
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missing chroma and averaging to subsample
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GstVideoChromaResample
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typedef struct _GstVideoChromaResample GstVideoChromaResample;
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Generated by GTK-Doc V1.27
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