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<!-- doxytag: class="AVDeviceCapabilitiesQuery" -->
<p>Following API allows user to probe device capabilities (supported codecs, pixel formats, sample formats, resolutions, channel counts, etc).
<a href="structAVDeviceCapabilitiesQuery.html#details">More...</a></p>
<p><code>#include <<a class="el" href="avdevice_8h_source.html">avdevice.h</a>></code></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-attribs"></a>
Data Fields</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">const <a class="el" href="structAVClass.html">AVClass</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVDeviceCapabilitiesQuery.html#ac5c8e5089e1bf1212b24193c0368f954">av_class</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="structAVFormatContext.html">AVFormatContext</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVDeviceCapabilitiesQuery.html#a97d7bfa2eacb9870273b02dd8ccfbe24">device_context</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum <a class="el" href="group__lavc__core.html#gaadca229ad2c20e060a14fec08a5cc7ce">AVCodecID</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVDeviceCapabilitiesQuery.html#a6b090d7f3793b7ec15caa3f4739fdec0">codec</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum <a class="el" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVDeviceCapabilitiesQuery.html#ad2f5c18496a1f70ac6c38f3379411f0b">sample_format</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVDeviceCapabilitiesQuery.html#a794f536fac8ba6c778df7ded1fd5eb99">pixel_format</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVDeviceCapabilitiesQuery.html#a094ff000e19b39981ad9a802557b773e">sample_rate</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVDeviceCapabilitiesQuery.html#a9b92050015539fbc4a9f6555eb3a672b">channels</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVDeviceCapabilitiesQuery.html#afd9911687a45ef4c5094242f06bf6fae">channel_layout</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVDeviceCapabilitiesQuery.html#af1003cea861179da74c546d4228cf20a">window_width</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVDeviceCapabilitiesQuery.html#a8625729bdff08b21445e88e1d538899d">window_height</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVDeviceCapabilitiesQuery.html#a24268116864767bd084f8b5bbb896150">frame_width</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVDeviceCapabilitiesQuery.html#a0d44c3def566bbfb2b304de2cb779847">frame_height</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="structAVRational.html">AVRational</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="structAVDeviceCapabilitiesQuery.html#a69a44cfb7d8fc9d706cfbe5a991ecaf7">fps</a></td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>Following API allows user to probe device capabilities (supported codecs, pixel formats, sample formats, resolutions, channel counts, etc). </p>
<p>It is build on top op <a class="el" href="structAVOption.html" title="AVOption.">AVOption</a> API. Queried capabilities make it possible to set up converters of video or audio parameters that fit to the device.</p>
<p>List of capabilities that can be queried:</p>
<ul>
<li>Capabilities valid for both audio and video devices:<ul>
<li>codec: supported audio/video codecs. type: AV_OPT_TYPE_INT (AVCodecID value)</li>
</ul>
</li>
<li>Capabilities valid for audio devices:<ul>
<li>sample_format: supported sample formats. type: AV_OPT_TYPE_INT (AVSampleFormat value)</li>
<li>sample_rate: supported sample rates. type: AV_OPT_TYPE_INT</li>
<li>channels: supported number of channels. type: AV_OPT_TYPE_INT</li>
<li>channel_layout: supported channel layouts. type: AV_OPT_TYPE_INT64</li>
</ul>
</li>
<li>Capabilities valid for video devices:<ul>
<li>pixel_format: supported pixel formats. type: AV_OPT_TYPE_INT (AVPixelFormat value)</li>
<li>window_size: supported window sizes (describes size of the window size presented to the user). type: AV_OPT_TYPE_IMAGE_SIZE</li>
<li>frame_size: supported frame sizes (describes size of provided video frames). type: AV_OPT_TYPE_IMAGE_SIZE</li>
<li>fps: supported fps values type: AV_OPT_TYPE_RATIONAL</li>
</ul>
</li>
</ul>
<p>Value of the capability may be set by user using <a class="el" href="group__opt__set__funcs.html#ga5fd4b92bdf4f392a2847f711676a7537">av_opt_set()</a> function and <a class="el" href="structAVDeviceCapabilitiesQuery.html" title="Following API allows user to probe device capabilities (supported codecs, pixel formats, sample formats, resolutions, channel counts, etc).">AVDeviceCapabilitiesQuery</a> object. Following queries will limit results to the values matching already set capabilities. For example, setting a codec may impact number of formats or fps values returned during next query. Setting invalid value may limit results to zero.</p>
<p>Example of the usage basing on opengl output device:</p>
<div class="fragment"><pre class="fragment"> <a class="code" href="structAVFormatContext.html" title="Format I/O context.">AVFormatContext</a> *oc = NULL;
<a class="code" href="structAVDeviceCapabilitiesQuery.html" title="Following API allows user to probe device capabilities (supported codecs, pixel formats, sample formats, resolutions, channel counts, etc).">AVDeviceCapabilitiesQuery</a> *caps = NULL;
<a class="code" href="structAVOptionRanges.html" title="List of AVOptionRange structs.">AVOptionRanges</a> *ranges;
<span class="keywordtype">int</span> ret;
<span class="keywordflow">if</span> ((ret = <a class="code" href="avformat_8h.html#a6ddf3d982feb45fa5081420ee911f5d5" title="Allocate an AVFormatContext for an output format.">avformat_alloc_output_context2</a>(&oc, NULL, <span class="stringliteral">"opengl"</span>, NULL)) < 0)
<span class="keywordflow">goto</span> fail;
<span class="keywordflow">if</span> (<a class="code" href="avdevice_8h.html#af802f1388f3f209cbbc93d9ba983a341" title="Initialize capabilities probing API based on AVOption API.">avdevice_capabilities_create</a>(&caps, oc, NULL) < 0)
<span class="keywordflow">goto</span> fail;
<span class="comment">//query codecs</span>
<span class="keywordflow">if</span> (<a class="code" href="group__avoptions.html#ga9751db4da3e0facd522f5b345f4001ef" title="Get a list of allowed ranges for the given option.">av_opt_query_ranges</a>(&ranges, caps, <span class="stringliteral">"codec"</span>, <a class="code" href="group__avoptions.html#ga1f10d07c79eec8bd1a8e1b91817e1b1a" title="Allows av_opt_query_ranges and av_opt_query_ranges_default to return more than one component for cert...">AV_OPT_MULTI_COMPONENT_RANGE</a>)) < 0)
<span class="keywordflow">goto</span> fail;
<span class="comment">//pick codec here and set it</span>
<a class="code" href="group__opt__set__funcs.html#ga5fd4b92bdf4f392a2847f711676a7537">av_opt_set</a>(caps, <span class="stringliteral">"codec"</span>, <a class="code" href="group__lavc__core.html#ggaadca229ad2c20e060a14fec08a5cc7cea1b88854d7b37174f45df205456d7c1cc">AV_CODEC_ID_RAWVIDEO</a>, 0);
<span class="comment">//query format</span>
<span class="keywordflow">if</span> (<a class="code" href="group__avoptions.html#ga9751db4da3e0facd522f5b345f4001ef" title="Get a list of allowed ranges for the given option.">av_opt_query_ranges</a>(&ranges, caps, <span class="stringliteral">"pixel_format"</span>, <a class="code" href="group__avoptions.html#ga1f10d07c79eec8bd1a8e1b91817e1b1a" title="Allows av_opt_query_ranges and av_opt_query_ranges_default to return more than one component for cert...">AV_OPT_MULTI_COMPONENT_RANGE</a>)) < 0)
<span class="keywordflow">goto</span> fail;
<span class="comment">//pick format here and set it</span>
<a class="code" href="group__opt__set__funcs.html#ga5fd4b92bdf4f392a2847f711676a7537">av_opt_set</a>(caps, <span class="stringliteral">"pixel_format"</span>, <a class="code" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5a1aa7677092740d8def31655b5d7f0cc2" title="planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)">AV_PIX_FMT_YUV420P</a>, 0);
<span class="comment">//query and set more capabilities</span>
fail:
<span class="comment">//clean up code</span>
<a class="code" href="avdevice_8h.html#a89c36d6e5698ad7dc2637226e1655dff" title="Free resources created by avdevice_capabilities_create()">avdevice_capabilities_free</a>(&query, oc);
<a class="code" href="group__lavf__core.html#gac2990b13b68e831a408fce8e1d0d6445" title="Free an AVFormatContext and all its streams.">avformat_free_context</a>(oc);
</pre></div><p> Structure describes device capabilities.</p>
<p>It is used by devices in conjunction with av_device_capabilities <a class="el" href="structAVOption.html" title="AVOption.">AVOption</a> table to implement capabilities probing API based on <a class="el" href="structAVOption.html" title="AVOption.">AVOption</a> API. Should not be used directly. </p>
<p>Definition at line <a class="el" href="avdevice_8h_source.html#l00399">399</a> of file <a class="el" href="avdevice_8h_source.html">avdevice.h</a>.</p>
</div><hr/><h2>Field Documentation</h2>
<a class="anchor" id="ac5c8e5089e1bf1212b24193c0368f954"></a><!-- doxytag: member="AVDeviceCapabilitiesQuery::av_class" ref="ac5c8e5089e1bf1212b24193c0368f954" args="" -->
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<td class="memname">const <a class="el" href="structAVClass.html">AVClass</a>* <a class="el" href="structAVDeviceCapabilitiesQuery.html#ac5c8e5089e1bf1212b24193c0368f954">AVDeviceCapabilitiesQuery::av_class</a></td>
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<div class="memdoc">
<p>Definition at line <a class="el" href="avdevice_8h_source.html#l00400">400</a> of file <a class="el" href="avdevice_8h_source.html">avdevice.h</a>.</p>
</div>
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<a class="anchor" id="a97d7bfa2eacb9870273b02dd8ccfbe24"></a><!-- doxytag: member="AVDeviceCapabilitiesQuery::device_context" ref="a97d7bfa2eacb9870273b02dd8ccfbe24" args="" -->
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<td class="memname"><a class="el" href="structAVFormatContext.html">AVFormatContext</a>* <a class="el" href="structAVDeviceCapabilitiesQuery.html#a97d7bfa2eacb9870273b02dd8ccfbe24">AVDeviceCapabilitiesQuery::device_context</a></td>
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<div class="memdoc">
<p>Definition at line <a class="el" href="avdevice_8h_source.html#l00401">401</a> of file <a class="el" href="avdevice_8h_source.html">avdevice.h</a>.</p>
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<a class="anchor" id="a6b090d7f3793b7ec15caa3f4739fdec0"></a><!-- doxytag: member="AVDeviceCapabilitiesQuery::codec" ref="a6b090d7f3793b7ec15caa3f4739fdec0" args="" -->
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<td class="memname">enum <a class="el" href="group__lavc__core.html#gaadca229ad2c20e060a14fec08a5cc7ce">AVCodecID</a> <a class="el" href="structAVDeviceCapabilitiesQuery.html#a6b090d7f3793b7ec15caa3f4739fdec0">AVDeviceCapabilitiesQuery::codec</a></td>
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<div class="memdoc">
<p>Definition at line <a class="el" href="avdevice_8h_source.html#l00402">402</a> of file <a class="el" href="avdevice_8h_source.html">avdevice.h</a>.</p>
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<a class="anchor" id="ad2f5c18496a1f70ac6c38f3379411f0b"></a><!-- doxytag: member="AVDeviceCapabilitiesQuery::sample_format" ref="ad2f5c18496a1f70ac6c38f3379411f0b" args="" -->
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<td class="memname">enum <a class="el" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> <a class="el" href="structAVDeviceCapabilitiesQuery.html#ad2f5c18496a1f70ac6c38f3379411f0b">AVDeviceCapabilitiesQuery::sample_format</a></td>
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<p>Definition at line <a class="el" href="avdevice_8h_source.html#l00403">403</a> of file <a class="el" href="avdevice_8h_source.html">avdevice.h</a>.</p>
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<p>Definition at line <a class="el" href="avdevice_8h_source.html#l00404">404</a> of file <a class="el" href="avdevice_8h_source.html">avdevice.h</a>.</p>
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<p>Definition at line <a class="el" href="avdevice_8h_source.html#l00405">405</a> of file <a class="el" href="avdevice_8h_source.html">avdevice.h</a>.</p>
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<p>Definition at line <a class="el" href="avdevice_8h_source.html#l00406">406</a> of file <a class="el" href="avdevice_8h_source.html">avdevice.h</a>.</p>
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<p>Definition at line <a class="el" href="avdevice_8h_source.html#l00407">407</a> of file <a class="el" href="avdevice_8h_source.html">avdevice.h</a>.</p>
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<p>Definition at line <a class="el" href="avdevice_8h_source.html#l00408">408</a> of file <a class="el" href="avdevice_8h_source.html">avdevice.h</a>.</p>
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<p>Definition at line <a class="el" href="avdevice_8h_source.html#l00409">409</a> of file <a class="el" href="avdevice_8h_source.html">avdevice.h</a>.</p>
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<p>Definition at line <a class="el" href="avdevice_8h_source.html#l00410">410</a> of file <a class="el" href="avdevice_8h_source.html">avdevice.h</a>.</p>
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<p>Definition at line <a class="el" href="avdevice_8h_source.html#l00411">411</a> of file <a class="el" href="avdevice_8h_source.html">avdevice.h</a>.</p>
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<a class="anchor" id="a69a44cfb7d8fc9d706cfbe5a991ecaf7"></a><!-- doxytag: member="AVDeviceCapabilitiesQuery::fps" ref="a69a44cfb7d8fc9d706cfbe5a991ecaf7" args="" -->
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<td class="memname"><a class="el" href="structAVRational.html">AVRational</a> <a class="el" href="structAVDeviceCapabilitiesQuery.html#a69a44cfb7d8fc9d706cfbe5a991ecaf7">AVDeviceCapabilitiesQuery::fps</a></td>
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<p>Definition at line <a class="el" href="avdevice_8h_source.html#l00412">412</a> of file <a class="el" href="avdevice_8h_source.html">avdevice.h</a>.</p>
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<hr/>The documentation for this struct was generated from the following file:<ul>
<li>libavdevice/<a class="el" href="avdevice_8h_source.html">avdevice.h</a></li>
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