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<title>GstVideoResampler: GStreamer Base Plugins 1.0 Library Reference Manual</title>
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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-GstVideoChroma.html" title="GstVideoChromaResample">
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Top |
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Description
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GstVideoResampler
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GstVideoResampler — Utility structure for resampler information
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Functions
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void
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gst_video_resampler_clear ()
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gboolean
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gst_video_resampler_init ()
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Types and Values
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struct
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GstVideoResampler
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enum
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GstVideoResamplerFlags
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enum
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GstVideoResamplerMethod
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#define
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GST_VIDEO_RESAMPLER_OPT_CUBIC_B
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#define
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GST_VIDEO_RESAMPLER_OPT_CUBIC_C
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#define
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GST_VIDEO_RESAMPLER_OPT_ENVELOPE
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#define
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GST_VIDEO_RESAMPLER_OPT_MAX_TAPS
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#define
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GST_VIDEO_RESAMPLER_OPT_SHARPEN
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#define
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GST_VIDEO_RESAMPLER_OPT_SHARPNESS
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Includes
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#include <gst/video/video-resampler.h>
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Description
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GstVideoResampler is a structure which holds the information
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required to perform various kinds of resampling filtering.
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Functions
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gst_video_resampler_clear ()
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void
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gst_video_resampler_clear (GstVideoResampler *resampler);
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Clear a previously initialized GstVideoResampler resampler
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.
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Parameters
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resampler
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a GstVideoResampler
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Since: 1.6
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gst_video_resampler_init ()
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gboolean
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gst_video_resampler_init (GstVideoResampler *resampler,
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GstVideoResamplerMethod method,
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GstVideoResamplerFlags flags,
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guint n_phases,
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guint n_taps,
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gdouble shift,
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guint in_size,
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guint out_size,
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GstStructure *options);
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Types and Values
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struct GstVideoResampler
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struct GstVideoResampler {
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gint in_size;
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gint out_size;
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guint max_taps;
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guint n_phases;
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guint32 *offset;
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guint32 *phase;
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guint32 *n_taps;
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gdouble *taps;
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};
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A structure holding resampler information.
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Members
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gint in_size;
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the input size
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gint out_size;
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the output size
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guint max_taps;
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the maximum number of taps
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guint n_phases;
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the number of phases
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guint32 *offset;
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array with the source offset for each output element
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guint32 *phase;
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array with the phase to use for each output element
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guint32 *n_taps;
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array with new number of taps for each phase
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gdouble *taps;
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the taps for all phases
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Since: 1.6
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enum GstVideoResamplerFlags
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Different resampler flags.
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Members
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GST_VIDEO_RESAMPLER_FLAG_NONE
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no flags
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GST_VIDEO_RESAMPLER_FLAG_HALF_TAPS
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when no taps are given, half the
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number of calculated taps. This can be used when making scalers
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for the different fields of an interlaced picture. Since 1.10
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Since: 1.6
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enum GstVideoResamplerMethod
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Different subsampling and upsampling methods
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Members
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GST_VIDEO_RESAMPLER_METHOD_NEAREST
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Duplicates the samples when
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upsampling and drops when downsampling
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GST_VIDEO_RESAMPLER_METHOD_LINEAR
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Uses linear interpolation to reconstruct
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missing samples and averaging to downsample
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GST_VIDEO_RESAMPLER_METHOD_CUBIC
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Uses cubic interpolation
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GST_VIDEO_RESAMPLER_METHOD_SINC
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Uses sinc interpolation
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GST_VIDEO_RESAMPLER_METHOD_LANCZOS
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Uses lanczos interpolation
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Since: 1.6
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GST_VIDEO_RESAMPLER_OPT_CUBIC_B
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#define GST_VIDEO_RESAMPLER_OPT_CUBIC_B "GstVideoResampler.cubic-b"
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G_TYPE_DOUBLE, B parameter of the cubic filter. The B
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parameter controls the bluriness. Values between 0.0 and
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2.0 are accepted. 1/3 is the default.
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Below are some values of popular filters:
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B C
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Hermite 0.0 0.0
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Spline 1.0 0.0
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Catmull-Rom 0.0 1/2
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Mitchell 1/3 1/3
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Robidoux 0.3782 0.3109
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Robidoux
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Sharp 0.2620 0.3690
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Robidoux
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Soft 0.6796 0.1602
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GST_VIDEO_RESAMPLER_OPT_CUBIC_C
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#define GST_VIDEO_RESAMPLER_OPT_CUBIC_C "GstVideoResampler.cubic-c"
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G_TYPE_DOUBLE, C parameter of the cubic filter. The C
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parameter controls the Keys alpha value. Values between 0.0 and
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2.0 are accepted. 1/3 is the default.
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See GST_VIDEO_RESAMPLER_OPT_CUBIC_B for some more common values
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GST_VIDEO_RESAMPLER_OPT_ENVELOPE
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#define GST_VIDEO_RESAMPLER_OPT_ENVELOPE "GstVideoResampler.envelope"
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G_TYPE_DOUBLE, specifies the size of filter envelope for
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GST_VIDEO_RESAMPLER_METHOD_LANCZOS
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. values are clamped between
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1.0 and 5.0. 2.0 is the default.
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GST_VIDEO_RESAMPLER_OPT_MAX_TAPS
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#define GST_VIDEO_RESAMPLER_OPT_MAX_TAPS "GstVideoResampler.max-taps"
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G_TYPE_INT, limits the maximum number of taps to use.
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16 is the default.
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GST_VIDEO_RESAMPLER_OPT_SHARPEN
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#define GST_VIDEO_RESAMPLER_OPT_SHARPEN "GstVideoResampler.sharpen"
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G_TYPE_DOUBLE, specifies sharpening of the filter for
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GST_VIDEO_RESAMPLER_METHOD_LANCZOS
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. values are clamped between
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0.0 and 1.0. 0.0 is the default.
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GST_VIDEO_RESAMPLER_OPT_SHARPNESS
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#define GST_VIDEO_RESAMPLER_OPT_SHARPNESS "GstVideoResampler.sharpness"
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G_TYPE_DOUBLE, specifies sharpness of the filter for
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GST_VIDEO_RESAMPLER_METHOD_LANCZOS
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. values are clamped between
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0.5 and 1.5. 1.0 is the default.
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