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 <span id="projectnumber">2.7.1</span>
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<a href="#func-members">Functions</a> </div>
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<div class="title">Pixel formats</div> </div>
<div class="ingroups"><a class="el" href="group__lavc__misc.html">Utility functions</a></div></div><!--header-->
<div class="contents">
<p>Functions for working with pixel formats.
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="func-members"></a>
Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc__pixfmt.html#ga8734c0195b87efe1a060ca101505c7b8">avcodec_get_chroma_sub_sample</a> (enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> <a class="el" href="demuxing__decoding_8c.html#a7331e302ea7bb48e0b605a069576e135">pix_fmt</a>, int *h_shift, int *v_shift)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Utility function to access log2_chroma_w log2_chroma_h from the pixel format <a class="el" href="structAVPixFmtDescriptor.html" title="Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...">AVPixFmtDescriptor</a>. <a href="#ga8734c0195b87efe1a060ca101505c7b8"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc__pixfmt.html#ga9bb07f91a7c87cba19a44ebdcf5bde63">avcodec_pix_fmt_to_codec_tag</a> (enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> <a class="el" href="demuxing__decoding_8c.html#a7331e302ea7bb48e0b605a069576e135">pix_fmt</a>)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return a value representing the fourCC code associated to the pixel format pix_fmt, or 0 if no associated fourCC code can be found. <a href="#ga9bb07f91a7c87cba19a44ebdcf5bde63"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc__pixfmt.html#ga838136cb54100d6afcb2f7e0377566ff">avcodec_get_pix_fmt_loss</a> (enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> dst_pix_fmt, enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> src_pix_fmt, int has_alpha)</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="group__lavc__misc__pixfmt.html#ga9e74b43a3433ccfe836814f0a6371aa0">avcodec_find_best_pix_fmt_of_list</a> (const enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> *pix_fmt_list, enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> src_pix_fmt, int has_alpha, int *loss_ptr)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Find the best pixel format to convert to given a certain source pixel format. <a href="#ga9e74b43a3433ccfe836814f0a6371aa0"></a><br/></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="group__lavc__misc__pixfmt.html#ga209703f647b87bd3f35ed97eb534fd21">avcodec_find_best_pix_fmt_of_2</a> (enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> dst_pix_fmt1, enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> dst_pix_fmt2, enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> src_pix_fmt, int has_alpha, int *loss_ptr)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> enum <br class="typebreak"/>
<a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__lavc__misc__pixfmt.html#gafaa40af15ce2d1ab4adca12b827ee85f">avcodec_find_best_pix_fmt2</a> (enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> dst_pix_fmt1, enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> dst_pix_fmt2, enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> src_pix_fmt, int has_alpha, int *loss_ptr)</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="group__lavc__misc__pixfmt.html#ga2d16136bf8844295b2f8ea17c386d833">avcodec_default_get_format</a> (struct <a class="el" href="structAVCodecContext.html">AVCodecContext</a> *s, const enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> *fmt)</td></tr>
</table>
<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<p>Functions for working with pixel formats. </p>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="ga8734c0195b87efe1a060ca101505c7b8"></a><!-- doxytag: member="avcodec.h::avcodec_get_chroma_sub_sample" ref="ga8734c0195b87efe1a060ca101505c7b8" args="(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)" -->
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<td class="memname">void <a class="el" href="group__lavc__misc__pixfmt.html#ga8734c0195b87efe1a060ca101505c7b8">avcodec_get_chroma_sub_sample</a> </td>
<td>(</td>
<td class="paramtype">enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> </td>
<td class="paramname"><em>pix_fmt</em>, </td>
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<td class="paramtype">int * </td>
<td class="paramname"><em>h_shift</em>, </td>
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<td class="paramtype">int * </td>
<td class="paramname"><em>v_shift</em> </td>
</tr>
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<td>)</td>
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<div class="memdoc">
<p>Utility function to access log2_chroma_w log2_chroma_h from the pixel format <a class="el" href="structAVPixFmtDescriptor.html" title="Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...">AVPixFmtDescriptor</a>. </p>
<p>This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample for one that returns a failure code and continues in case of invalid pix_fmts.</p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">pix_fmt</td><td>the pixel format </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">h_shift</td><td>store log2_chroma_w </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">v_shift</td><td>store log2_chroma_h</td></tr>
</table>
</dd>
</dl>
<dl class="see"><dt><b>See also:</b></dt><dd><a class="el" href="pixdesc_8h.html#a76e011cf53b51ea14a002a206f6ca05d" title="Utility function to access log2_chroma_w log2_chroma_h from the pixel format AVPixFmtDescriptor.">av_pix_fmt_get_chroma_sub_sample</a> </dd></dl>
</div>
</div>
<a class="anchor" id="ga9bb07f91a7c87cba19a44ebdcf5bde63"></a><!-- doxytag: member="avcodec.h::avcodec_pix_fmt_to_codec_tag" ref="ga9bb07f91a7c87cba19a44ebdcf5bde63" args="(enum AVPixelFormat pix_fmt)" -->
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<td class="memname">unsigned int <a class="el" href="group__lavc__misc__pixfmt.html#ga9bb07f91a7c87cba19a44ebdcf5bde63">avcodec_pix_fmt_to_codec_tag</a> </td>
<td>(</td>
<td class="paramtype">enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> </td>
<td class="paramname"><em>pix_fmt</em></td><td>)</td>
<td></td>
</tr>
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<div class="memdoc">
<p>Return a value representing the fourCC code associated to the pixel format pix_fmt, or 0 if no associated fourCC code can be found. </p>
</div>
</div>
<a class="anchor" id="ga838136cb54100d6afcb2f7e0377566ff"></a><!-- doxytag: member="avcodec.h::avcodec_get_pix_fmt_loss" ref="ga838136cb54100d6afcb2f7e0377566ff" args="(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt, int has_alpha)" -->
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<td class="memname">int <a class="el" href="group__lavc__misc__pixfmt.html#ga838136cb54100d6afcb2f7e0377566ff">avcodec_get_pix_fmt_loss</a> </td>
<td>(</td>
<td class="paramtype">enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> </td>
<td class="paramname"><em>dst_pix_fmt</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> </td>
<td class="paramname"><em>src_pix_fmt</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>has_alpha</em> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td>
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<div class="memdoc">
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000022">Deprecated:</a></b></dt><dd>see <a class="el" href="pixdesc_8h.html#a69ba6ef97543b19a15236a513e56dffe" title="Compute what kind of losses will occur when converting from one specific pixel format to another...">av_get_pix_fmt_loss()</a> </dd></dl>
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</div>
<a class="anchor" id="ga9e74b43a3433ccfe836814f0a6371aa0"></a><!-- doxytag: member="avcodec.h::avcodec_find_best_pix_fmt_of_list" ref="ga9e74b43a3433ccfe836814f0a6371aa0" args="(const enum AVPixelFormat *pix_fmt_list, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)" -->
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<td class="memname">enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> <a class="el" href="group__lavc__misc__pixfmt.html#ga9e74b43a3433ccfe836814f0a6371aa0">avcodec_find_best_pix_fmt_of_list</a> </td>
<td>(</td>
<td class="paramtype">const enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> * </td>
<td class="paramname"><em>pix_fmt_list</em>, </td>
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<td></td>
<td class="paramtype">enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> </td>
<td class="paramname"><em>src_pix_fmt</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"><em>has_alpha</em>, </td>
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<td class="paramtype">int * </td>
<td class="paramname"><em>loss_ptr</em> </td>
</tr>
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<td>)</td>
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<p>Find the best pixel format to convert to given a certain source pixel format. </p>
<p>When converting from one pixel format to another, information loss may occur. For example, when converting from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when converting from some formats to other formats. <a class="el" href="group__lavc__misc__pixfmt.html#ga209703f647b87bd3f35ed97eb534fd21">avcodec_find_best_pix_fmt_of_2()</a> searches which of the given pixel formats should be used to suffer the least amount of loss. The pixel formats from which it chooses one, are determined by the pix_fmt_list parameter.</p>
<dl class="params"><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">pix_fmt_list</td><td>AV_PIX_FMT_NONE terminated array of pixel formats to choose from </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">src_pix_fmt</td><td>source pixel format </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">has_alpha</td><td>Whether the source pixel format alpha channel is used. </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">loss_ptr</td><td>Combination of flags informing you what kind of losses will occur. </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>The best pixel format to convert to or -1 if none was found. </dd></dl>
</div>
</div>
<a class="anchor" id="ga209703f647b87bd3f35ed97eb534fd21"></a><!-- doxytag: member="avcodec.h::avcodec_find_best_pix_fmt_of_2" ref="ga209703f647b87bd3f35ed97eb534fd21" args="(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)" -->
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<td class="memname">enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> <a class="el" href="group__lavc__misc__pixfmt.html#ga209703f647b87bd3f35ed97eb534fd21">avcodec_find_best_pix_fmt_of_2</a> </td>
<td>(</td>
<td class="paramtype">enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> </td>
<td class="paramname"><em>dst_pix_fmt1</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> </td>
<td class="paramname"><em>dst_pix_fmt2</em>, </td>
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<td></td>
<td class="paramtype">enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> </td>
<td class="paramname"><em>src_pix_fmt</em>, </td>
</tr>
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<td class="paramtype">int </td>
<td class="paramname"><em>has_alpha</em>, </td>
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<td class="paramtype">int * </td>
<td class="paramname"><em>loss_ptr</em> </td>
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<td>)</td>
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</tr>
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<div class="memdoc">
<dl class="deprecated"><dt><b><a class="el" href="deprecated.html#_deprecated000023">Deprecated:</a></b></dt><dd>see <a class="el" href="pixdesc_8h.html#a875f1e7a15d882d4cd9d38dde093939b" title="Compute what kind of losses will occur when converting from one specific pixel format to another...">av_find_best_pix_fmt_of_2()</a> </dd></dl>
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<a class="anchor" id="gafaa40af15ce2d1ab4adca12b827ee85f"></a><!-- doxytag: member="avcodec.h::avcodec_find_best_pix_fmt2" ref="gafaa40af15ce2d1ab4adca12b827ee85f" args="(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2, enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr)" -->
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<td class="memname"><a class="el" href="attributes_8h.html#aa6d076561d3a9eea4729ee632652de02">attribute_deprecated</a> enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> <a class="el" href="group__lavc__misc__pixfmt.html#gafaa40af15ce2d1ab4adca12b827ee85f">avcodec_find_best_pix_fmt2</a> </td>
<td>(</td>
<td class="paramtype">enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> </td>
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<td class="paramname"><em>loss_ptr</em> </td>
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<td class="memname">enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> <a class="el" href="group__lavc__misc__pixfmt.html#ga2d16136bf8844295b2f8ea17c386d833">avcodec_default_get_format</a> </td>
<td>(</td>
<td class="paramtype">struct <a class="el" href="structAVCodecContext.html">AVCodecContext</a> * </td>
<td class="paramname"><em>s</em>, </td>
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<td class="paramtype">const enum <a class="el" href="pixfmt_8h.html#a9a8e335cf3be472042bc9f0cf80cd4c5">AVPixelFormat</a> * </td>
<td class="paramname"><em>fmt</em> </td>
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<td>)</td>
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