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<div class="title">AVDeviceCapabilitiesQuery Struct Reference</div> </div>
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<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 class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-attribs"></a>
Data Fields</h2></td></tr>
<tr class="memitem:ac5c8e5089e1bf1212b24193c0368f954"><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 class="separator:ac5c8e5089e1bf1212b24193c0368f954"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a97d7bfa2eacb9870273b02dd8ccfbe24"><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 class="separator:a97d7bfa2eacb9870273b02dd8ccfbe24"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a6b090d7f3793b7ec15caa3f4739fdec0"><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 class="separator:a6b090d7f3793b7ec15caa3f4739fdec0"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad2f5c18496a1f70ac6c38f3379411f0b"><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 class="separator:ad2f5c18496a1f70ac6c38f3379411f0b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a794f536fac8ba6c778df7ded1fd5eb99"><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 class="separator:a794f536fac8ba6c778df7ded1fd5eb99"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a094ff000e19b39981ad9a802557b773e"><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 class="separator:a094ff000e19b39981ad9a802557b773e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a9b92050015539fbc4a9f6555eb3a672b"><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 class="separator:a9b92050015539fbc4a9f6555eb3a672b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:afd9911687a45ef4c5094242f06bf6fae"><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 class="separator:afd9911687a45ef4c5094242f06bf6fae"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:af1003cea861179da74c546d4228cf20a"><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 class="separator:af1003cea861179da74c546d4228cf20a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a8625729bdff08b21445e88e1d538899d"><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 class="separator:a8625729bdff08b21445e88e1d538899d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a24268116864767bd084f8b5bbb896150"><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 class="separator:a24268116864767bd084f8b5bbb896150"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a0d44c3def566bbfb2b304de2cb779847"><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 class="separator:a0d44c3def566bbfb2b304de2cb779847"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a69a44cfb7d8fc9d706cfbe5a991ecaf7"><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>
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<a name="details" id="details"></a><h2 class="groupheader">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"><div class="line"> <a class="code" href="structAVFormatContext.html">AVFormatContext</a> *oc = NULL;</div>
<div class="line"> <a class="code" href="structAVDeviceCapabilitiesQuery.html">AVDeviceCapabilitiesQuery</a> *caps = NULL;</div>
<div class="line"> <a class="code" href="structAVOptionRanges.html">AVOptionRanges</a> *ranges;</div>
<div class="line"> <span class="keywordtype">int</span> ret;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> ((ret = <a class="code" href="avformat_8h.html#a6ddf3d982feb45fa5081420ee911f5d5">avformat_alloc_output_context2</a>(&oc, NULL, <span class="stringliteral">"opengl"</span>, NULL)) < 0)</div>
<div class="line"> <span class="keywordflow">goto</span> fail;</div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="avdevice_8h.html#af802f1388f3f209cbbc93d9ba983a341">avdevice_capabilities_create</a>(&caps, oc, NULL) < 0)</div>
<div class="line"> <span class="keywordflow">goto</span> fail;</div>
<div class="line"></div>
<div class="line"> <span class="comment">//query codecs</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="group__avoptions.html#ga9751db4da3e0facd522f5b345f4001ef">av_opt_query_ranges</a>(&ranges, caps, <span class="stringliteral">"codec"</span>, <a class="code" href="group__avoptions.html#ga1f10d07c79eec8bd1a8e1b91817e1b1a">AV_OPT_MULTI_COMPONENT_RANGE</a>)) < 0)</div>
<div class="line"> <span class="keywordflow">goto</span> fail;</div>
<div class="line"> <span class="comment">//pick codec here and set it</span></div>
<div class="line"> <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);</div>
<div class="line"></div>
<div class="line"> <span class="comment">//query format</span></div>
<div class="line"> <span class="keywordflow">if</span> (<a class="code" href="group__avoptions.html#ga9751db4da3e0facd522f5b345f4001ef">av_opt_query_ranges</a>(&ranges, caps, <span class="stringliteral">"pixel_format"</span>, <a class="code" href="group__avoptions.html#ga1f10d07c79eec8bd1a8e1b91817e1b1a">AV_OPT_MULTI_COMPONENT_RANGE</a>)) < 0)</div>
<div class="line"> <span class="keywordflow">goto</span> fail;</div>
<div class="line"> <span class="comment">//pick format here and set it</span></div>
<div class="line"> <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">AV_PIX_FMT_YUV420P</a>, 0);</div>
<div class="line"></div>
<div class="line"> <span class="comment">//query and set more capabilities</span></div>
<div class="line"></div>
<div class="line">fail:</div>
<div class="line"> <span class="comment">//clean up code</span></div>
<div class="line"> <a class="code" href="avdevice_8h.html#a89c36d6e5698ad7dc2637226e1655dff">avdevice_capabilities_free</a>(&query, oc);</div>
<div class="line"> <a class="code" href="group__lavf__core.html#gac2990b13b68e831a408fce8e1d0d6445">avformat_free_context</a>(oc);</div>
</div><!-- fragment --><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><h2 class="groupheader">Field Documentation</h2>
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<td class="memname">const <a class="el" href="structAVClass.html">AVClass</a>* AVDeviceCapabilitiesQuery::av_class</td>
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<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>
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<td class="memname"><a class="el" href="structAVFormatContext.html">AVFormatContext</a>* AVDeviceCapabilitiesQuery::device_context</td>
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<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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<td class="memname">enum <a class="el" href="group__lavc__core.html#gaadca229ad2c20e060a14fec08a5cc7ce">AVCodecID</a> AVDeviceCapabilitiesQuery::codec</td>
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<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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<td class="memname">enum <a class="el" href="group__lavu__sampfmts.html#gaf9a51ca15301871723577c730b5865c5">AVSampleFormat</a> AVDeviceCapabilitiesQuery::sample_format</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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<td class="memname">enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> AVDeviceCapabilitiesQuery::pixel_format</td>
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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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<td class="memname">int AVDeviceCapabilitiesQuery::sample_rate</td>
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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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<td class="memname">int AVDeviceCapabilitiesQuery::channels</td>
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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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<td class="memname">int64_t AVDeviceCapabilitiesQuery::channel_layout</td>
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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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<td class="memname">int AVDeviceCapabilitiesQuery::window_width</td>
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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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<td class="memname">int AVDeviceCapabilitiesQuery::window_height</td>
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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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<td class="memname">int AVDeviceCapabilitiesQuery::frame_width</td>
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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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<td class="memname">int AVDeviceCapabilitiesQuery::frame_height</td>
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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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<td class="memname"><a class="el" href="structAVRational.html">AVRational</a> AVDeviceCapabilitiesQuery::fps</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>
</ul>
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