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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>GstVideoScaler: 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-GstVideoResampler.html" title="GstVideoResampler">
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<link rel="next" href="GstVideoSink.html" title="GstVideoSink">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Description
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GstVideoScaler
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GstVideoScaler — Utility object for rescaling video frames
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Functions
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void
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gst_video_scaler_2d ()
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GstVideoScaler *
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gst_video_scaler_combine_packed_YUV ()
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void
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gst_video_scaler_free ()
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const gdouble *
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gst_video_scaler_get_coeff ()
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void
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gst_video_scaler_horizontal ()
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GstVideoScaler *
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gst_video_scaler_new ()
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void
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gst_video_scaler_vertical ()
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guint
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gst_video_scaler_get_max_taps ()
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Types and Values
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GstVideoScaler
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enum
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GstVideoScalerFlags
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#define
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GST_VIDEO_SCALER_OPT_DITHER_METHOD
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Includes
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#include <gst/video/video.h>
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Description
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GstVideoScaler is a utility object for rescaling and resampling
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video frames using various interpolation / sampling methods.
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Functions
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gst_video_scaler_2d ()
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void
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gst_video_scaler_2d (GstVideoScaler *hscale,
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GstVideoScaler *vscale,
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GstVideoFormat format,
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gpointer src,
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gint src_stride,
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gpointer dest,
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gint dest_stride,
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guint x,
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guint y,
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guint width,
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guint height);
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Scale a rectangle of pixels in src
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with src_stride
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to dest
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with
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dest_stride
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using the horizontal scaler hscaler
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and the vertical
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scaler vscale
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One or both of hscale
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and vscale
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can be NULL to only perform scaling in
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one dimension or do a copy without scaling.
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x
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and y
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are the coordinates in the destination image to process.
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Parameters
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hscale
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a horzontal GstVideoScaler
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vscale
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a vertical GstVideoScaler
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format
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a GstVideoFormat for srcs
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and dest
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src
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source pixels
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src_stride
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source pixels stride
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dest
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destination pixels
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dest_stride
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destination pixels stride
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x
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the horizontal destination offset
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y
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the vertical destination offset
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width
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the number of output pixels to scale
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height
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the number of output lines to scale
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gst_video_scaler_combine_packed_YUV ()
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GstVideoScaler *
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gst_video_scaler_combine_packed_YUV (GstVideoScaler *y_scale,
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GstVideoScaler *uv_scale,
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GstVideoFormat in_format,
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GstVideoFormat out_format);
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Combine a scaler for Y and UV into one scaler for the packed format
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.
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[skip]
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Parameters
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y_scale
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a scaler for the Y component
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uv_scale
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a scaler for the U and V components
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in_format
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the input video format
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out_format
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the output video format
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Returns
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a new horizontal videoscaler for format
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.
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Since: 1.6
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gst_video_scaler_free ()
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void
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gst_video_scaler_free (GstVideoScaler *scale);
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Free a previously allocated GstVideoScaler scale
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Parameters
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scale
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a GstVideoScaler
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gst_video_scaler_get_coeff ()
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const gdouble *
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gst_video_scaler_get_coeff (GstVideoScaler *scale,
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guint out_offset,
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guint *in_offset,
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guint *n_taps);
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For a given pixel at out_offset
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, get the first required input pixel at
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in_offset
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and the n_taps
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filter coefficients.
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Note that for interlaced content, in_offset
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needs to be incremented with
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2 to get the next input line.
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Parameters
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scale
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a GstVideoScaler
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out_offset
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an output offset
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in_offset
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result input offset
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n_taps
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result n_taps
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Returns
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an array of n_tap
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gdouble values with filter coefficients.
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gst_video_scaler_horizontal ()
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void
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gst_video_scaler_horizontal (GstVideoScaler *scale,
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GstVideoFormat format,
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gpointer src,
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gpointer dest,
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guint dest_offset,
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guint width);
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0652a1 |
Horizontally scale the pixels in src
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to dest
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, starting from dest_offset
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for width
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samples.
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Parameters
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scale
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a GstVideoScaler
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0652a1 |
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0652a1 |
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format
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0652a1 |
a GstVideoFormat for src
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and dest
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src
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source pixels
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dest
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destination pixels
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dest_offset
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0652a1 |
the horizontal destination offset
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
width
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0652a1 |
the number of pixels to scale
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0652a1 |
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0652a1 |
gst_video_scaler_new ()
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0652a1 |
GstVideoScaler *
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0652a1 |
gst_video_scaler_new (GstVideoResamplerMethod method,
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0652a1 |
GstVideoScalerFlags flags,
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0652a1 |
guint n_taps,
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0652a1 |
guint in_size,
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0652a1 |
guint out_size,
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0652a1 |
GstStructure *options);
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0652a1 |
Make a new method
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0652a1 |
video scaler. in_size
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0652a1 |
source lines/pixels will
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0652a1 |
be scaled to out_size
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0652a1 |
destination lines/pixels.
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0652a1 |
n_taps
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0652a1 |
specifies the amount of pixels to use from the source for one output
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0652a1 |
pixel. If n_taps is 0, this function chooses a good value automatically based
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on the method
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and in_size
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/out_size
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0652a1 |
.
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0652a1 |
[skip]
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0652a1 |
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Parameters
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method
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a GstVideoResamplerMethod
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
flags
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0652a1 |
GstVideoScalerFlags
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
n_taps
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0652a1 |
number of taps to use
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
in_size
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0652a1 |
number of source elements
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
out_size
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0652a1 |
number of destination elements
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
options
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0652a1 |
extra options.
|
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0652a1 |
[allow-none]
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
Returns
|
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0652a1 |
a GstVideoScaler
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
gst_video_scaler_vertical ()
|
|
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0652a1 |
void
|
|
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0652a1 |
gst_video_scaler_vertical (GstVideoScaler *scale,
|
|
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0652a1 |
GstVideoFormat format,
|
|
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0652a1 |
gpointer src_lines[],
|
|
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0652a1 |
gpointer dest,
|
|
Packit |
0652a1 |
guint dest_offset,
|
|
Packit |
0652a1 |
guint width);
|
|
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0652a1 |
Vertically combine width
|
|
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0652a1 |
pixels in the lines in src_lines
|
|
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0652a1 |
to dest
|
|
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0652a1 |
.
|
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0652a1 |
dest
|
|
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0652a1 |
is the location of the target line at dest_offset
|
|
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0652a1 |
and
|
|
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0652a1 |
srcs
|
|
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0652a1 |
are the input lines for dest_offset
|
|
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0652a1 |
, as obtained with
|
|
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0652a1 |
gst_video_scaler_get_info().
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0652a1 |
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0652a1 |
Parameters
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
|
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0652a1 |
|
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Packit |
0652a1 |
scale
|
|
Packit |
0652a1 |
a GstVideoScaler
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
|
|
Packit |
0652a1 |
format
|
|
Packit |
0652a1 |
a GstVideoFormat for srcs
|
|
Packit |
0652a1 |
and dest
|
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0652a1 |
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0652a1 |
|
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0652a1 |
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0652a1 |
src_lines
|
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0652a1 |
source pixels lines
|
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dest
|
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0652a1 |
destination pixels
|
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0652a1 |
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0652a1 |
|
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0652a1 |
|
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0652a1 |
dest_offset
|
|
Packit |
0652a1 |
the vertical destination offset
|
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Packit |
0652a1 |
|
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Packit |
0652a1 |
|
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Packit |
0652a1 |
|
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Packit |
0652a1 |
width
|
|
Packit |
0652a1 |
the number of pixels to scale
|
|
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0652a1 |
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0652a1 |
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0652a1 |
|
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0652a1 |
gst_video_scaler_get_max_taps ()
|
|
Packit |
0652a1 |
guint
|
|
Packit |
0652a1 |
gst_video_scaler_get_max_taps (GstVideoScaler *scale);
|
|
Packit |
0652a1 |
Get the maximum number of taps for scale
|
|
Packit |
0652a1 |
.
|
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Packit |
0652a1 |
|
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0652a1 |
Parameters
|
|
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
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0652a1 |
|
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0652a1 |
|
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0652a1 |
scale
|
|
Packit |
0652a1 |
a GstVideoScaler
|
|
Packit |
0652a1 |
|
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0652a1 |
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0652a1 |
|
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0652a1 |
|
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|
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0652a1 |
Returns
|
|
Packit |
0652a1 |
the maximum number of taps
|
|
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0652a1 |
|
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0652a1 |
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0652a1 |
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0652a1 |
Types and Values
|
|
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0652a1 |
|
|
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0652a1 |
GstVideoScaler
|
|
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0652a1 |
typedef struct _GstVideoScaler GstVideoScaler;
|
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0652a1 |
|
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0652a1 |
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0652a1 |
|
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0652a1 |
enum GstVideoScalerFlags
|
|
Packit |
0652a1 |
Different scale flags.
|
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0652a1 |
|
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0652a1 |
Members
|
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0652a1 |
|
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0652a1 |
GST_VIDEO_SCALER_FLAG_NONE
|
|
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0652a1 |
|
|
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0652a1 |
no flags
|
|
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0652a1 |
|
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0652a1 |
|
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0652a1 |
|
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|
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0652a1 |
GST_VIDEO_SCALER_FLAG_INTERLACED
|
|
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0652a1 |
|
|
Packit |
0652a1 |
Set up a scaler for interlaced content
|
|
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0652a1 |
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0652a1 |
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0652a1 |
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|
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0652a1 |
GST_VIDEO_SCALER_OPT_DITHER_METHOD
|
|
Packit |
0652a1 |
#define GST_VIDEO_SCALER_OPT_DITHER_METHOD "GstVideoScaler.dither-method"
|
|
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0652a1 |
|
|
Packit |
0652a1 |
GST_TYPE_VIDEO_DITHER_METHOD, The dither method to use for propagating
|
|
Packit |
0652a1 |
quatization errors.
|
|
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0652a1 |
|
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0652a1 |
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0652a1 |
|
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Generated by GTK-Doc V1.28
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</body>
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</html>
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