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<h1>th_info Struct Reference</h1><!-- doxytag: class="th_info" -->
<p>Theora bitstream information.
<a href="#_details">More...</a></p>
<p><code>#include &lt;<a class="el" href="codec_8h_source.html">codec.h</a>&gt;</code></p>
<table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Data Fields</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">ogg_uint32_t&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="structth__info.html#a6b8087a4d831da53011a43b8d74087a0">frame_width</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The encoded frame width. <a href="#a6b8087a4d831da53011a43b8d74087a0"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">ogg_uint32_t&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="structth__info.html#a6b1adc3a16a8336a72692b0a5937214c">frame_height</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The encoded frame height. <a href="#a6b1adc3a16a8336a72692b0a5937214c"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">ogg_uint32_t&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="structth__info.html#a5048edf77b141dd3e9a92ca85e317345">pic_width</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The displayed picture width. <a href="#a5048edf77b141dd3e9a92ca85e317345"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">ogg_uint32_t&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="structth__info.html#a775178474283c5990ba73f9ba7f6b88b">pic_height</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The displayed picture height. <a href="#a775178474283c5990ba73f9ba7f6b88b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">ogg_uint32_t&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="structth__info.html#a5b3f834bcf141564e7bb14f49101870f">pic_x</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The X offset of the displayed picture. <a href="#a5b3f834bcf141564e7bb14f49101870f"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">ogg_uint32_t&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="structth__info.html#a8aacc575cab2dfe3735001c2ad32aa14">pic_y</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The Y offset of the displayed picture. <a href="#a8aacc575cab2dfe3735001c2ad32aa14"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="codec_8h.html#a4ce7a695ce353b1582d29b6c1ddf31a0">th_colorspace</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="structth__info.html#a8c7828cd0e023e9d21108160d53659a6">colorspace</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The color space. <a href="#a8c7828cd0e023e9d21108160d53659a6"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="codec_8h.html#a5c9e7f2f0c7ed209c9ca3ed0abd328bc">th_pixel_fmt</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="structth__info.html#a2301388ef3755c41ab12fd144c1fc54e">pixel_fmt</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The pixel format. <a href="#a2301388ef3755c41ab12fd144c1fc54e"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="structth__info.html#a1d9c8d768a4ae623269f5bd8f6f7a015">target_bitrate</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The target bit-rate in bits per second. <a href="#a1d9c8d768a4ae623269f5bd8f6f7a015"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="structth__info.html#aa4cdcf96cb46b256821993e9a830ee02">quality</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The target quality level. <a href="#aa4cdcf96cb46b256821993e9a830ee02"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="structth__info.html#a693ca4ab11fbc0c3f32594b4bb8766ed">keyframe_granule_shift</a></td></tr>
<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The amount to shift to extract the last keyframe number from the granule position. <a href="#a693ca4ab11fbc0c3f32594b4bb8766ed"></a><br/></td></tr>
<tr><td colspan="2"><div class="groupHeader">Theora version</div></td></tr>
<tr><td colspan="2"><div class="groupText"><p><a class="anchor" id="amgrpf735645ddddaaf44dc0647da0e883f6c"></a>Bitstream version information.</p>
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<tr><td class="memItemLeft" align="right" valign="top">unsigned char&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="structth__info.html#a60b3e2cac006fee0e105a918d6a5a9f9">version_major</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">unsigned char&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="structth__info.html#abb1d4887a8079c6c5aaa6d7229f243d7">version_minor</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">unsigned char&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="structth__info.html#abfacc79b7cabae12b6ac2484f76602d3">version_subminor</a></td></tr>
<tr><td colspan="2"><div class="groupHeader">Frame rate</div></td></tr>
<tr><td colspan="2"><div class="groupText"><p><a class="anchor" id="amgrp801309c4a0e25a4db3fe5739b322b0a7"></a>The frame rate, as a fraction.</p>
<p>If either is 0, the frame rate is undefined. </p>
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<tr><td class="memItemLeft" align="right" valign="top">ogg_uint32_t&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="structth__info.html#a20606e61676f585a7e59cfc96de190a5">fps_numerator</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">ogg_uint32_t&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="structth__info.html#aa619408f70c03935529f1d3eda7a3ec2">fps_denominator</a></td></tr>
<tr><td colspan="2"><div class="groupHeader">Aspect ratio</div></td></tr>
<tr><td colspan="2"><div class="groupText"><p><a class="anchor" id="amgrpdeca19914b5126815a2220f15d067c9b"></a>The aspect ratio of the pixels.</p>
<p>If either value is zero, the aspect ratio is undefined. If not specified by any external means, 1:1 should be assumed. The aspect ratio of the full picture can be computed as </p>
<div class="fragment"><pre class="fragment"> <a class="code" href="structth__info.html#a5be65dac9f75e37864cf73dd543570cd">aspect_numerator</a>*<a class="code" href="structth__info.html#a5048edf77b141dd3e9a92ca85e317345" title="The displayed picture width.">pic_width</a>/(<a class="code" href="structth__info.html#a04c0bd477222d747a76085d8720322e2">aspect_denominator</a>*<a class="code" href="structth__info.html#a775178474283c5990ba73f9ba7f6b88b" title="The displayed picture height.">pic_height</a>).
</pre></div> <br/><br/></div></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top">ogg_uint32_t&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="structth__info.html#a04c0bd477222d747a76085d8720322e2">aspect_denominator</a></td></tr>
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<hr/><a name="_details"></a><h2>Detailed Description</h2>
<p>Theora bitstream information. </p>
<p>This contains the basic playback parameters for a stream, and corresponds to the initial 'info' header packet. To initialize an encoder, the application fills in this structure and passes it to <a class="el" href="group__encfuncs.html#gaa91e47bc9dd5f6ee52045bd7b815e5a7" title="Allocates an encoder instance.">th_encode_alloc()</a>. A default encoding mode is chosen based on the values of the <a class="el" href="structth__info.html#aa4cdcf96cb46b256821993e9a830ee02" title="The target quality level.">quality</a> and <a class="el" href="structth__info.html#a1d9c8d768a4ae623269f5bd8f6f7a015" title="The target bit-rate in bits per second.">target_bitrate</a> fields. On decode, it is filled in by <a class="el" href="group__decfuncs.html#ga006d01d36fbe64768c571e6a12b7fc50" title="Decodes the header packets of a Theora stream.">th_decode_headerin()</a>, and then passed to <a class="el" href="group__decfuncs.html#ga0ef07a9a97849054aa606c595a2d807e" title="Allocates a decoder instance.">th_decode_alloc()</a>.</p>
<p>Encoded Theora frames must be a multiple of 16 in size; this is what the <a class="el" href="structth__info.html#a6b8087a4d831da53011a43b8d74087a0" title="The encoded frame width.">frame_width</a> and <a class="el" href="structth__info.html#a6b1adc3a16a8336a72692b0a5937214c" title="The encoded frame height.">frame_height</a> members represent. To handle arbitrary picture sizes, a crop rectangle is specified in the <a class="el" href="structth__info.html#a5b3f834bcf141564e7bb14f49101870f" title="The X offset of the displayed picture.">pic_x</a>, <a class="el" href="structth__info.html#a8aacc575cab2dfe3735001c2ad32aa14" title="The Y offset of the displayed picture.">pic_y</a>, <a class="el" href="structth__info.html#a5048edf77b141dd3e9a92ca85e317345" title="The displayed picture width.">pic_width</a> and <a class="el" href="structth__info.html#a775178474283c5990ba73f9ba7f6b88b" title="The displayed picture height.">pic_height</a> members.</p>
<p>All frame buffers contain pointers to the full, padded frame. However, the current encoder <em>will not</em> reference pixels outside of the cropped picture region, and the application does not need to fill them in. The decoder <em>will</em> allocate storage for a full frame, but the application <em>should not</em> rely on the padding containing sensible data.</p>
<p>It is also generally recommended that the offsets and sizes should still be multiples of 2 to avoid chroma sampling shifts when chroma is sub-sampled. See <a href="http://www.theora.org/doc/Theora.pdf">the Theora specification</a>, Section 4.4, for more details.</p>
<p>Frame rate, in frames per second, is stored as a rational fraction, as is the pixel aspect ratio. Note that this refers to the aspect ratio of the individual pixels, not of the overall frame itself. The frame aspect ratio can be computed from pixel aspect ratio using the image dimensions. </p>
<hr/><h2>Field Documentation</h2>
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<td class="memname"><a class="el" href="codec_8h.html#a4ce7a695ce353b1582d29b6c1ddf31a0">th_colorspace</a> <a class="el" href="structth__info.html#a8c7828cd0e023e9d21108160d53659a6">th_info::colorspace</a></td>
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<p>The color space. </p>
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<p>The encoded frame height. </p>
<p>This must be a multiple of 16, and less than 1048576. </p>
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<p>The encoded frame width. </p>
<p>This must be a multiple of 16, and less than 1048576. </p>
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<p>The amount to shift to extract the last keyframe number from the granule position. </p>
<p>This can be at most 31. <a class="el" href="group__basefuncs.html#ga430d9c605816a6ca0bdce3a0b965b926" title="Initializes a th_info structure.">th_info_init()</a> will set this to a default value (currently <code>6</code>, which is good for streaming applications), but you can set it to 0 to make every frame a keyframe. The maximum distance between key frames is <code>1&lt;&lt;<a class="el" href="structth__info.html#a693ca4ab11fbc0c3f32594b4bb8766ed" title="The amount to shift to extract the last keyframe number from the granule position...">keyframe_granule_shift</a></code>. The keyframe frequency can be more finely controlled with <a class="el" href="theoraenc_8h.html#a27e755e15b4b5604c54974b304037a49" title="Sets the maximum distance between key frames.">TH_ENCCTL_SET_KEYFRAME_FREQUENCY_FORCE</a>, which can also be adjusted during encoding (for example, to force the next frame to be a keyframe), but it cannot be set larger than the amount permitted by this field after the headers have been output. </p>
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<p>The displayed picture height. </p>
<p>This must be no larger than height. </p>
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<p>The displayed picture width. </p>
<p>This must be no larger than width. </p>
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<p>The X offset of the displayed picture. </p>
<p>This must be no larger than <a class="el" href="structth__info.html#a6b8087a4d831da53011a43b8d74087a0" title="The encoded frame width.">frame_width</a>-<a class="el" href="structth__info.html#a5048edf77b141dd3e9a92ca85e317345" title="The displayed picture width.">pic_width</a> or 255, whichever is smaller. </p>
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<p>The Y offset of the displayed picture. </p>
<p>This must be no larger than <a class="el" href="structth__info.html#a6b1adc3a16a8336a72692b0a5937214c" title="The encoded frame height.">frame_height</a>-<a class="el" href="structth__info.html#a775178474283c5990ba73f9ba7f6b88b" title="The displayed picture height.">pic_height</a>, and <a class="el" href="structth__info.html#a6b1adc3a16a8336a72692b0a5937214c" title="The encoded frame height.">frame_height</a>-<a class="el" href="structth__info.html#a775178474283c5990ba73f9ba7f6b88b" title="The displayed picture height.">pic_height</a>-<a class="el" href="structth__info.html#a8aacc575cab2dfe3735001c2ad32aa14" title="The Y offset of the displayed picture.">pic_y</a> must be no larger than 255. This slightly funny restriction is due to the fact that the offset is specified from the top of the image for consistency with the standard graphics left-handed coordinate system used throughout this API, while it is stored in the encoded stream as an offset from the bottom. </p>
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<td class="memname"><a class="el" href="codec_8h.html#a5c9e7f2f0c7ed209c9ca3ed0abd328bc">th_pixel_fmt</a> <a class="el" href="structth__info.html#a2301388ef3755c41ab12fd144c1fc54e">th_info::pixel_fmt</a></td>
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<p>The pixel format. </p>
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<a class="anchor" id="aa4cdcf96cb46b256821993e9a830ee02"></a><!-- doxytag: member="th_info::quality" ref="aa4cdcf96cb46b256821993e9a830ee02" args="" -->
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<td class="memname">int <a class="el" href="structth__info.html#aa4cdcf96cb46b256821993e9a830ee02">th_info::quality</a></td>
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<p>The target quality level. </p>
<p>Valid values range from 0 to 63, inclusive, with higher values giving higher quality. If initializing an encoder with this struct, and <a class="el" href="structth__info.html#a1d9c8d768a4ae623269f5bd8f6f7a015" title="The target bit-rate in bits per second.">target_bitrate</a> is set to zero, VBR encoding at this quality will be activated by default. </p>
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<td class="memname">int <a class="el" href="structth__info.html#a1d9c8d768a4ae623269f5bd8f6f7a015">th_info::target_bitrate</a></td>
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<p>The target bit-rate in bits per second. </p>
<p>If initializing an encoder with this struct, set this field to a non-zero value to activate CBR encoding by default. </p>
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<td class="memname">unsigned char <a class="el" href="structth__info.html#a60b3e2cac006fee0e105a918d6a5a9f9">th_info::version_major</a></td>
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<a class="anchor" id="abb1d4887a8079c6c5aaa6d7229f243d7"></a><!-- doxytag: member="th_info::version_minor" ref="abb1d4887a8079c6c5aaa6d7229f243d7" args="" -->
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<td class="memname">unsigned char <a class="el" href="structth__info.html#abb1d4887a8079c6c5aaa6d7229f243d7">th_info::version_minor</a></td>
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<td class="memname">unsigned char <a class="el" href="structth__info.html#abfacc79b7cabae12b6ac2484f76602d3">th_info::version_subminor</a></td>
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<hr/>The documentation for this struct was generated from the following file:<ul>
<li><a class="el" href="codec_8h_source.html">codec.h</a></li>
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<hr size="1"/><address style="text-align: right;"><small>Generated on 28 Sep 2009 for libtheora by&nbsp;
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