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5<title>GstVideoResampler: GStreamer Base Plugins 1.0 Library Reference Manual</title>
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25<div class="refentry">
26<a name="gst-plugins-base-libs-GstVideoResampler"></a><div class="titlepage"></div>
27<div class="refnamediv"><table width="100%"><tr>
28<td valign="top">
29<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-GstVideoResampler.top_of_page"></a>GstVideoResampler</span></h2>
30<p>GstVideoResampler — Utility structure for resampler information</p>
31</td>
32<td class="gallery_image" valign="top" align="right"></td>
33</tr></table></div>
34<div class="refsect1">
35<a name="gst-plugins-base-libs-GstVideoResampler.functions"></a><h2>Functions</h2>
36<div class="informaltable"><table class="informaltable" width="100%" border="0">
37<colgroup>
38<col width="150px" class="functions_return">
39<col class="functions_name">
40</colgroup>
41<tbody>
42<tr>
43<td class="function_type">
44<span class="returnvalue">void</span>
45</td>
46<td class="function_name">
47<a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#gst-video-resampler-clear" title="gst_video_resampler_clear ()">gst_video_resampler_clear</a> <span class="c_punctuation">()</span>
48</td>
49</tr>
50<tr>
51<td class="function_type">
52<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
53</td>
54<td class="function_name">
55<a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#gst-video-resampler-init" title="gst_video_resampler_init ()">gst_video_resampler_init</a> <span class="c_punctuation">()</span>
56</td>
57</tr>
58</tbody>
59</table></div>
60</div>
61<div class="refsect1">
62<a name="gst-plugins-base-libs-GstVideoResampler.other"></a><h2>Types and Values</h2>
63<div class="informaltable"><table class="informaltable" width="100%" border="0">
64<colgroup>
65<col width="150px" class="name">
66<col class="description">
67</colgroup>
68<tbody>
69<tr>
70<td class="datatype_keyword">struct</td>
71<td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResampler" title="struct GstVideoResampler">GstVideoResampler</a></td>
72</tr>
73<tr>
74<td class="datatype_keyword">enum</td>
75<td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResamplerFlags" title="enum GstVideoResamplerFlags">GstVideoResamplerFlags</a></td>
76</tr>
77<tr>
78<td class="datatype_keyword">enum</td>
79<td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResamplerMethod" title="enum GstVideoResamplerMethod">GstVideoResamplerMethod</a></td>
80</tr>
81<tr>
82<td class="define_keyword">#define</td>
83<td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GST-VIDEO-RESAMPLER-OPT-CUBIC-B:CAPS" title="GST_VIDEO_RESAMPLER_OPT_CUBIC_B">GST_VIDEO_RESAMPLER_OPT_CUBIC_B</a></td>
84</tr>
85<tr>
86<td class="define_keyword">#define</td>
87<td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GST-VIDEO-RESAMPLER-OPT-CUBIC-C:CAPS" title="GST_VIDEO_RESAMPLER_OPT_CUBIC_C">GST_VIDEO_RESAMPLER_OPT_CUBIC_C</a></td>
88</tr>
89<tr>
90<td class="define_keyword">#define</td>
91<td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GST-VIDEO-RESAMPLER-OPT-ENVELOPE:CAPS" title="GST_VIDEO_RESAMPLER_OPT_ENVELOPE">GST_VIDEO_RESAMPLER_OPT_ENVELOPE</a></td>
92</tr>
93<tr>
94<td class="define_keyword">#define</td>
95<td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GST-VIDEO-RESAMPLER-OPT-MAX-TAPS:CAPS" title="GST_VIDEO_RESAMPLER_OPT_MAX_TAPS">GST_VIDEO_RESAMPLER_OPT_MAX_TAPS</a></td>
96</tr>
97<tr>
98<td class="define_keyword">#define</td>
99<td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GST-VIDEO-RESAMPLER-OPT-SHARPEN:CAPS" title="GST_VIDEO_RESAMPLER_OPT_SHARPEN">GST_VIDEO_RESAMPLER_OPT_SHARPEN</a></td>
100</tr>
101<tr>
102<td class="define_keyword">#define</td>
103<td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GST-VIDEO-RESAMPLER-OPT-SHARPNESS:CAPS" title="GST_VIDEO_RESAMPLER_OPT_SHARPNESS">GST_VIDEO_RESAMPLER_OPT_SHARPNESS</a></td>
104</tr>
105</tbody>
106</table></div>
107</div>
108<div class="refsect1">
109<a name="gst-plugins-base-libs-GstVideoResampler.includes"></a><h2>Includes</h2>
110<pre class="synopsis">#include &lt;gst/video/video.h&gt;
111</pre>
112</div>
113<div class="refsect1">
114<a name="gst-plugins-base-libs-GstVideoResampler.description"></a><h2>Description</h2>
115<p><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResampler" title="struct GstVideoResampler"><span class="type">GstVideoResampler</span></a> is a structure which holds the information
116required to perform various kinds of resampling filtering.</p>
117</div>
118<div class="refsect1">
119<a name="gst-plugins-base-libs-GstVideoResampler.functions_details"></a><h2>Functions</h2>
120<div class="refsect2">
121<a name="gst-video-resampler-clear"></a><h3>gst_video_resampler_clear ()</h3>
122<pre class="programlisting"><span class="returnvalue">void</span>
123gst_video_resampler_clear (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResampler" title="struct GstVideoResampler"><span class="type">GstVideoResampler</span></a> *resampler</code></em>);</pre>
124<p>Clear a previously initialized <a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResampler" title="struct GstVideoResampler"><span class="type">GstVideoResampler</span></a> <em class="parameter"><code>resampler</code></em>
125.</p>
126<div class="refsect3">
127<a name="gst-video-resampler-clear.parameters"></a><h4>Parameters</h4>
128<div class="informaltable"><table class="informaltable" width="100%" border="0">
129<colgroup>
130<col width="150px" class="parameters_name">
131<col class="parameters_description">
132<col width="200px" class="parameters_annotations">
133</colgroup>
134<tbody><tr>
135<td class="parameter_name"><p>resampler</p></td>
136<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResampler" title="struct GstVideoResampler"><span class="type">GstVideoResampler</span></a></p></td>
137<td class="parameter_annotations"> </td>
138</tr></tbody>
139</table></div>
140</div>
141<p class="since">Since: <a class="link" href="ix10.html#api-index-1.6">1.6</a></p>
142</div>
143<hr>
144<div class="refsect2">
145<a name="gst-video-resampler-init"></a><h3>gst_video_resampler_init ()</h3>
146<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
147gst_video_resampler_init (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResampler" title="struct GstVideoResampler"><span class="type">GstVideoResampler</span></a> *resampler</code></em>,
148                          <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResamplerMethod" title="enum GstVideoResamplerMethod"><span class="type">GstVideoResamplerMethod</span></a> method</code></em>,
149                          <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GstVideoResamplerFlags" title="enum GstVideoResamplerFlags"><span class="type">GstVideoResamplerFlags</span></a> flags</code></em>,
150                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> n_phases</code></em>,
151                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> n_taps</code></em>,
152                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> shift</code></em>,
153                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> in_size</code></em>,
154                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> out_size</code></em>,
155                          <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstStructure.html#GstStructure-struct"><span class="type">GstStructure</span></a> *options</code></em>);</pre>
156</div>
157</div>
158<div class="refsect1">
159<a name="gst-plugins-base-libs-GstVideoResampler.other_details"></a><h2>Types and Values</h2>
160<div class="refsect2">
161<a name="GstVideoResampler"></a><h3>struct GstVideoResampler</h3>
162<pre class="programlisting">struct GstVideoResampler {
163  gint in_size;
164  gint out_size;
165  guint max_taps;
166  guint n_phases;
167  guint32 *offset;
168  guint32 *phase;
169  guint32 *n_taps;
170  gdouble *taps;
171};
172</pre>
173<p>A structure holding resampler information.</p>
174<div class="refsect3">
175<a name="GstVideoResampler.members"></a><h4>Members</h4>
176<div class="informaltable"><table class="informaltable" width="100%" border="0">
177<colgroup>
178<col width="300px" class="struct_members_name">
179<col class="struct_members_description">
180<col width="200px" class="struct_members_annotations">
181</colgroup>
182<tbody>
183<tr>
184<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstVideoResampler.in-size"></a>in_size</code></em>;</p></td>
185<td class="struct_member_description"><p>the input size</p></td>
186<td class="struct_member_annotations"> </td>
187</tr>
188<tr>
189<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstVideoResampler.out-size"></a>out_size</code></em>;</p></td>
190<td class="struct_member_description"><p>the output size</p></td>
191<td class="struct_member_annotations"> </td>
192</tr>
193<tr>
194<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GstVideoResampler.max-taps"></a>max_taps</code></em>;</p></td>
195<td class="struct_member_description"><p>the maximum number of taps</p></td>
196<td class="struct_member_annotations"> </td>
197</tr>
198<tr>
199<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GstVideoResampler.n-phases"></a>n_phases</code></em>;</p></td>
200<td class="struct_member_description"><p>the number of phases</p></td>
201<td class="struct_member_annotations"> </td>
202</tr>
203<tr>
204<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"><span class="type">guint32</span></a> *<em class="structfield"><code><a name="GstVideoResampler.offset"></a>offset</code></em>;</p></td>
205<td class="struct_member_description"><p>array with the source offset for each output element</p></td>
206<td class="struct_member_annotations"> </td>
207</tr>
208<tr>
209<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"><span class="type">guint32</span></a> *<em class="structfield"><code><a name="GstVideoResampler.phase"></a>phase</code></em>;</p></td>
210<td class="struct_member_description"><p>array with the phase to use for each output element</p></td>
211<td class="struct_member_annotations"> </td>
212</tr>
213<tr>
214<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint32"><span class="type">guint32</span></a> *<em class="structfield"><code><a name="GstVideoResampler.n-taps"></a>n_taps</code></em>;</p></td>
215<td class="struct_member_description"><p>array with new number of taps for each phase</p></td>
216<td class="struct_member_annotations"> </td>
217</tr>
218<tr>
219<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *<em class="structfield"><code><a name="GstVideoResampler.taps"></a>taps</code></em>;</p></td>
220<td class="struct_member_description"><p>the taps for all phases</p></td>
221<td class="struct_member_annotations"> </td>
222</tr>
223</tbody>
224</table></div>
225</div>
226<p class="since">Since: <a class="link" href="ix10.html#api-index-1.6">1.6</a></p>
227</div>
228<hr>
229<div class="refsect2">
230<a name="GstVideoResamplerFlags"></a><h3>enum GstVideoResamplerFlags</h3>
231<p>Different resampler flags.</p>
232<div class="refsect3">
233<a name="GstVideoResamplerFlags.members"></a><h4>Members</h4>
234<div class="informaltable"><table class="informaltable" width="100%" border="0">
235<colgroup>
236<col width="300px" class="enum_members_name">
237<col class="enum_members_description">
238<col width="200px" class="enum_members_annotations">
239</colgroup>
240<tbody>
241<tr>
242<td class="enum_member_name"><p><a name="GST-VIDEO-RESAMPLER-FLAG-NONE:CAPS"></a>GST_VIDEO_RESAMPLER_FLAG_NONE</p></td>
243<td class="enum_member_description">
244<p>no flags</p>
245</td>
246<td class="enum_member_annotations"> </td>
247</tr>
248<tr>
249<td class="enum_member_name"><p><a name="GST-VIDEO-RESAMPLER-FLAG-HALF-TAPS:CAPS"></a>GST_VIDEO_RESAMPLER_FLAG_HALF_TAPS</p></td>
250<td class="enum_member_description">
251<p>when no taps are given, half the
252             number of calculated taps. This can be used when making scalers
253             for the different fields of an interlaced picture. Since: 1.10</p>
254</td>
255<td class="enum_member_annotations"> </td>
256</tr>
257</tbody>
258</table></div>
259</div>
260<p class="since">Since: <a class="link" href="ix10.html#api-index-1.6">1.6</a></p>
261</div>
262<hr>
263<div class="refsect2">
264<a name="GstVideoResamplerMethod"></a><h3>enum GstVideoResamplerMethod</h3>
265<p>Different subsampling and upsampling methods</p>
266<div class="refsect3">
267<a name="GstVideoResamplerMethod.members"></a><h4>Members</h4>
268<div class="informaltable"><table class="informaltable" width="100%" border="0">
269<colgroup>
270<col width="300px" class="enum_members_name">
271<col class="enum_members_description">
272<col width="200px" class="enum_members_annotations">
273</colgroup>
274<tbody>
275<tr>
276<td class="enum_member_name"><p><a name="GST-VIDEO-RESAMPLER-METHOD-NEAREST:CAPS"></a>GST_VIDEO_RESAMPLER_METHOD_NEAREST</p></td>
277<td class="enum_member_description">
278<p>Duplicates the samples when
279   upsampling and drops when downsampling</p>
280</td>
281<td class="enum_member_annotations"> </td>
282</tr>
283<tr>
284<td class="enum_member_name"><p><a name="GST-VIDEO-RESAMPLER-METHOD-LINEAR:CAPS"></a>GST_VIDEO_RESAMPLER_METHOD_LINEAR</p></td>
285<td class="enum_member_description">
286<p>Uses linear interpolation to reconstruct
287   missing samples and averaging to downsample</p>
288</td>
289<td class="enum_member_annotations"> </td>
290</tr>
291<tr>
292<td class="enum_member_name"><p><a name="GST-VIDEO-RESAMPLER-METHOD-CUBIC:CAPS"></a>GST_VIDEO_RESAMPLER_METHOD_CUBIC</p></td>
293<td class="enum_member_description">
294<p>Uses cubic interpolation</p>
295</td>
296<td class="enum_member_annotations"> </td>
297</tr>
298<tr>
299<td class="enum_member_name"><p><a name="GST-VIDEO-RESAMPLER-METHOD-SINC:CAPS"></a>GST_VIDEO_RESAMPLER_METHOD_SINC</p></td>
300<td class="enum_member_description">
301<p>Uses sinc interpolation</p>
302</td>
303<td class="enum_member_annotations"> </td>
304</tr>
305<tr>
306<td class="enum_member_name"><p><a name="GST-VIDEO-RESAMPLER-METHOD-LANCZOS:CAPS"></a>GST_VIDEO_RESAMPLER_METHOD_LANCZOS</p></td>
307<td class="enum_member_description">
308<p>Uses lanczos interpolation</p>
309</td>
310<td class="enum_member_annotations"> </td>
311</tr>
312</tbody>
313</table></div>
314</div>
315<p class="since">Since: <a class="link" href="ix10.html#api-index-1.6">1.6</a></p>
316</div>
317<hr>
318<div class="refsect2">
319<a name="GST-VIDEO-RESAMPLER-OPT-CUBIC-B:CAPS"></a><h3>GST_VIDEO_RESAMPLER_OPT_CUBIC_B</h3>
320<pre class="programlisting">#define GST_VIDEO_RESAMPLER_OPT_CUBIC_B      "GstVideoResampler.cubic-b"
321</pre>
322<p>G_TYPE_DOUBLE, B parameter of the cubic filter. The B
323parameter controls the bluriness. Values between 0.0 and
3242.0 are accepted. 1/3 is the default.</p>
325<p>Below are some values of popular filters:
326                   B       C
327Hermite           0.0     0.0
328Spline            1.0     0.0
329Catmull-Rom       0.0     1/2
330Mitchell          1/3     1/3
331Robidoux          0.3782  0.3109
332Robidoux
333 Sharp            0.2620  0.3690
334Robidoux
335 Soft             0.6796  0.1602</p>
336</div>
337<hr>
338<div class="refsect2">
339<a name="GST-VIDEO-RESAMPLER-OPT-CUBIC-C:CAPS"></a><h3>GST_VIDEO_RESAMPLER_OPT_CUBIC_C</h3>
340<pre class="programlisting">#define GST_VIDEO_RESAMPLER_OPT_CUBIC_C      "GstVideoResampler.cubic-c"
341</pre>
342<p>G_TYPE_DOUBLE, C parameter of the cubic filter. The C
343parameter controls the Keys alpha value. Values between 0.0 and
3442.0 are accepted. 1/3 is the default.</p>
345<p>See <a class="link" href="gst-plugins-base-libs-GstVideoResampler.html#GST-VIDEO-RESAMPLER-OPT-CUBIC-B:CAPS" title="GST_VIDEO_RESAMPLER_OPT_CUBIC_B"><span class="type">GST_VIDEO_RESAMPLER_OPT_CUBIC_B</span></a> for some more common values</p>
346</div>
347<hr>
348<div class="refsect2">
349<a name="GST-VIDEO-RESAMPLER-OPT-ENVELOPE:CAPS"></a><h3>GST_VIDEO_RESAMPLER_OPT_ENVELOPE</h3>
350<pre class="programlisting">#define GST_VIDEO_RESAMPLER_OPT_ENVELOPE      "GstVideoResampler.envelope"
351</pre>
352<p>G_TYPE_DOUBLE, specifies the size of filter envelope for
353<em class="parameter"><code>GST_VIDEO_RESAMPLER_METHOD_LANCZOS</code></em>
354. values are clamped between
3551.0 and 5.0. 2.0 is the default.</p>
356</div>
357<hr>
358<div class="refsect2">
359<a name="GST-VIDEO-RESAMPLER-OPT-MAX-TAPS:CAPS"></a><h3>GST_VIDEO_RESAMPLER_OPT_MAX_TAPS</h3>
360<pre class="programlisting">#define GST_VIDEO_RESAMPLER_OPT_MAX_TAPS     "GstVideoResampler.max-taps"
361</pre>
362<p>G_TYPE_INT, limits the maximum number of taps to use.
36316 is the default.</p>
364</div>
365<hr>
366<div class="refsect2">
367<a name="GST-VIDEO-RESAMPLER-OPT-SHARPEN:CAPS"></a><h3>GST_VIDEO_RESAMPLER_OPT_SHARPEN</h3>
368<pre class="programlisting">#define GST_VIDEO_RESAMPLER_OPT_SHARPEN      "GstVideoResampler.sharpen"
369</pre>
370<p>G_TYPE_DOUBLE, specifies sharpening of the filter for
371<em class="parameter"><code>GST_VIDEO_RESAMPLER_METHOD_LANCZOS</code></em>
372. values are clamped between
3730.0 and 1.0. 0.0 is the default.</p>
374</div>
375<hr>
376<div class="refsect2">
377<a name="GST-VIDEO-RESAMPLER-OPT-SHARPNESS:CAPS"></a><h3>GST_VIDEO_RESAMPLER_OPT_SHARPNESS</h3>
378<pre class="programlisting">#define GST_VIDEO_RESAMPLER_OPT_SHARPNESS     "GstVideoResampler.sharpness"
379</pre>
380<p>G_TYPE_DOUBLE, specifies sharpness of the filter for
381<em class="parameter"><code>GST_VIDEO_RESAMPLER_METHOD_LANCZOS</code></em>
382. values are clamped between
3830.5 and 1.5. 1.0 is the default.</p>
384</div>
385</div>
386</div>
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