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Dirac - A Video Codec
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Created by the <a href="http://www.bbc.co.uk">British Broadcasting Corporation</a>.
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<div class="navpath"><a class="el" href="a00234.html">dirac</a>::<a class="el" href="a00085.html">ModeDecider</a>
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<h1>dirac::ModeDecider Class Reference</h1><!-- doxytag: class="dirac::ModeDecider" -->Decides between superblock and block prediction modes.
<a href="#_details">More...</a>
<p>
<code>#include <<a class="el" href="a00194_source.html">me_mode_decn.h</a>></code>
<p>
<p>
<a href="a00368.html">List of all members.</a><h2>Public Member Functions</h2>
<ul>
<li><a class="el" href="a00085.html#4f0b96f094c3e9c4a768c848699c415c">ModeDecider</a> (const <a class="el" href="a00063.html">EncoderParams</a> &encp)
<dl class="el"><dd class="mdescRight">Constructor. <a href="#4f0b96f094c3e9c4a768c848699c415c"></a><br></dl><li><a class="el" href="a00085.html#a13bd9dd2abf11631a78c2036971b7e6">~ModeDecider</a> ()
<dl class="el"><dd class="mdescRight">Destructor. <a href="#a13bd9dd2abf11631a78c2036971b7e6"></a><br></dl><li>void <a class="el" href="a00085.html#ea5a08af5c4864ed7da89d99c00e1497">DoModeDecn</a> (<a class="el" href="a00065.html">EncQueue</a> &my_buffer, int pic_num)
<dl class="el"><dd class="mdescRight">Does the actual mode decision. <a href="#ea5a08af5c4864ed7da89d99c00e1497"></a><br></dl></ul>
<h2>Private Member Functions</h2>
<ul>
<li><a class="el" href="a00085.html#c80197aed2e33f96aaf19811d886d977">ModeDecider</a> (const <a class="el" href="a00085.html">ModeDecider</a> &cpy)
<li><a class="el" href="a00085.html">ModeDecider</a> & <a class="el" href="a00085.html#199ae680080d4520b84b194828d2e930">operator=</a> (const <a class="el" href="a00085.html">ModeDecider</a> &rhs)
<li>void <a class="el" href="a00085.html#141e7d5a61036ae2bfb4bbc415ea34b0">DoSBDecn</a> ()
<li>void <a class="el" href="a00085.html#a22edd6a16b80117a5137dff0758d365">DoLevelDecn</a> (int level)
<dl class="el"><dd class="mdescRight">Make a mode decision given a particular level of decomposition. <a href="#a22edd6a16b80117a5137dff0758d365"></a><br></dl><li>float <a class="el" href="a00085.html#9cdea8794f99c87ba79628a23fcd6d19">DoUnitDecn</a> (const int xpos, const int ypos, const int level)
<dl class="el"><dd class="mdescRight">Decide on a mode for a given prediction unit (block, sub-SB or SB). <a href="#9cdea8794f99c87ba79628a23fcd6d19"></a><br></dl><li>void <a class="el" href="a00085.html#891dca9c8c51f3d224f1f2fb465e17bb">DoME</a> (const int xpos, const int ypos, const int level)
<dl class="el"><dd class="mdescRight">Do motion estimation for a prediction unit at a given level. <a href="#891dca9c8c51f3d224f1f2fb465e17bb"></a><br></dl><li>float <a class="el" href="a00085.html#4e4090fd306aff714c4e3044516764cb">ModeCost</a> (const int xindex, const int yindex)
<dl class="el"><dd class="mdescRight">Return a measure of the cost of coding a given mode. <a href="#4e4090fd306aff714c4e3044516764cb"></a><br></dl><li><a class="el" href="a00234.html#548820ca76f864dc8630df79b2c5c5b9">ValueType</a> <a class="el" href="a00085.html#99f85b80c40efda559e4d1e21fa4c826">GetDCPred</a> (int xblock, int yblock)
<dl class="el"><dd class="mdescRight">Get a prediction for the dc value of a block. <a href="#99f85b80c40efda559e4d1e21fa4c826"></a><br></dl><li>float <a class="el" href="a00085.html#103fb05cdfb02ac60d2bcae6d2c43cf6">GetDCVar</a> (const <a class="el" href="a00234.html#548820ca76f864dc8630df79b2c5c5b9">ValueType</a> dc_val, const <a class="el" href="a00234.html#548820ca76f864dc8630df79b2c5c5b9">ValueType</a> dc_pred)
<dl class="el"><dd class="mdescRight">Get a measure of DC value variance. <a href="#103fb05cdfb02ac60d2bcae6d2c43cf6"></a><br></dl><li>void <a class="el" href="a00085.html#8f7178a4d3d160f04e422daa2faae77f">SetDC</a> (<a class="el" href="a00065.html">EncQueue</a> &my_buffer, int pic_num)
<dl class="el"><dd class="mdescRight">Go through all the intra blocks and extract the chroma dc values to be coded. <a href="#8f7178a4d3d160f04e422daa2faae77f"></a><br></dl><li>void <a class="el" href="a00085.html#9e2f8267da9507ec27de3bccc8f25beb">SetDC</a> (const <a class="el" href="a00107.html">PicArray</a> &pic_data, <a class="el" href="a00082.html">MEData</a> &me_data, <a class="el" href="a00234.html#39dd89c4c7484412efd87d41548271cd">CompSort</a> cs)
<dl class="el"><dd class="mdescRight">Called by previous fn for each component. <a href="#9e2f8267da9507ec27de3bccc8f25beb"></a><br></dl><li><a class="el" href="a00234.html#548820ca76f864dc8630df79b2c5c5b9">ValueType</a> <a class="el" href="a00085.html#aac3c27af518605d0eb9928225c17d21">GetBlockDC</a> (const <a class="el" href="a00107.html">PicArray</a> &pic_data, int xloc, int yloc, int split, <a class="el" href="a00234.html#39dd89c4c7484412efd87d41548271cd">CompSort</a> cs)
<dl class="el"><dd class="mdescRight">Called by previous fn for each block. <a href="#aac3c27af518605d0eb9928225c17d21"></a><br></dl></ul>
<h2>Private Attributes</h2>
<ul>
<li><a class="el" href="a00115.html">PictureSort</a> <a class="el" href="a00085.html#6b861899043a9571d0e0a1154310d8de">m_psort</a>
<li>const <a class="el" href="a00063.html">EncoderParams</a> & <a class="el" href="a00085.html#957f0c1240acc79cbc6606c31a2ccc81">m_encparams</a>
<dl class="el"><dd class="mdescRight">A local reference to the encoder parameters. <a href="#957f0c1240acc79cbc6606c31a2ccc81"></a><br></dl><li>const <a class="el" href="a00114.html">PicturePredParams</a> * <a class="el" href="a00085.html#1fbb4f66f792c0056f06c5c615d4baf7">m_predparams</a>
<dl class="el"><dd class="mdescRight">A local pointer to the picture prediction params. <a href="#1fbb4f66f792c0056f06c5c615d4baf7"></a><br></dl><li>float <a class="el" href="a00085.html#1271f4d6d56fd7812ab6a9240ac92ba0">m_lambda</a>
<dl class="el"><dd class="mdescRight">The Lagrangian parameter for motion estimation. <a href="#1271f4d6d56fd7812ab6a9240ac92ba0"></a><br></dl><li><a class="el" href="a00097.html">OneDArray</a>< float > <a class="el" href="a00085.html#0dc2d25973772f82d777aca337104f55">m_level_factor</a>
<dl class="el"><dd class="mdescRight">Correction factor for comparing SAD costs for different SB splittings. <a href="#0dc2d25973772f82d777aca337104f55"></a><br></dl><li><a class="el" href="a00097.html">OneDArray</a>< float > <a class="el" href="a00085.html#87fc96b0a8b9c3e5a1719cd4b4debf16">m_mode_factor</a>
<dl class="el"><dd class="mdescRight">Correction factor for comparing mode costs for different SB splittings. <a href="#87fc96b0a8b9c3e5a1719cd4b4debf16"></a><br></dl><li><a class="el" href="a00097.html">OneDArray</a>< <a class="el" href="a00082.html">MEData</a> * > <a class="el" href="a00085.html#4e62b40e23cf8dd8f6926bd294704133">m_me_data_set</a>
<dl class="el"><dd class="mdescRight">Motion vector data for each level of splitting. <a href="#4e62b40e23cf8dd8f6926bd294704133"></a><br></dl><li>const <a class="el" href="a00107.html">PicArray</a> * <a class="el" href="a00085.html#e1178fd2db1b78ca449e75f2cab3bd5b">m_pic_data</a>
<li>const <a class="el" href="a00107.html">PicArray</a> * <a class="el" href="a00085.html#9bba52c4c71051bb5b1901475246e7c2">m_ref1_updata</a>
<li>const <a class="el" href="a00107.html">PicArray</a> * <a class="el" href="a00085.html#b547ba0aacc3fb23450e431470df272d">m_ref2_updata</a>
<li>int <a class="el" href="a00085.html#0feb345b4fb798323a569130f80779ee">num_refs</a>
<li><a class="el" href="a00078.html">IntraBlockDiff</a> * <a class="el" href="a00085.html#2c824439a4c4f94e3967378ba1e22788">m_intradiff</a>
<li><a class="el" href="a00004.html">BiBlockDiff</a> * <a class="el" href="a00085.html#992b0eec017f995b5f337ca97a343ce9">m_bicheckdiff</a>
<li>int <a class="el" href="a00085.html#6ae903cd1e4079f8f274a648a34a21dc">m_xsb_loc</a>
<li>int <a class="el" href="a00085.html#d5367eb68fe3402961d90984dd8465cb">m_ysb_loc</a>
</ul>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Loops over all the superblocks and decides on the best modes. A superblock is a square of 16 blocks. There are three possible splitting levels: level 0 means the superblock is considered as a single block; level 1 means the superblock is considered as 4 larger blocks, termed sub-superblocks; level 0 means the superblock is split right down to blocks.<p>
In deciding which modes to adopt, the <a class="el" href="a00085.html" title="Decides between superblock and block prediction modes.">ModeDecider</a> object calculates costs for all permutations, doing motion estimation for the level 1 and level 0 modes as these have not been calculated before. The process of decision for each is as follows. For each SB, we loop over the levels, and call DoLevelDecn. DoLevelDecn does motion estimation if it's necessary. Then it assumes that we don't have a common block mode and calls DoUnitDecn which finds the best mode for each unit in the SB at that level, individually. When we've got a best cost for that level we go up to the next one. <hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="4f0b96f094c3e9c4a768c848699c415c"></a><!-- doxytag: member="dirac::ModeDecider::ModeDecider" ref="4f0b96f094c3e9c4a768c848699c415c" args="(const EncoderParams &encp)" -->
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<td class="memname">dirac::ModeDecider::ModeDecider </td>
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The constructor creates arrays for handling the motion vector data at splitting levels 0 and 1, as motion estimation must be performed for these levels.
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<a class="anchor" name="a13bd9dd2abf11631a78c2036971b7e6"></a><!-- doxytag: member="dirac::ModeDecider::~ModeDecider" ref="a13bd9dd2abf11631a78c2036971b7e6" args="()" -->
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<td class="memname">dirac::ModeDecider::~ModeDecider </td>
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The destructor destroys the classes created in the constructor
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<a class="anchor" name="c80197aed2e33f96aaf19811d886d977"></a><!-- doxytag: member="dirac::ModeDecider::ModeDecider" ref="c80197aed2e33f96aaf19811d886d977" args="(const ModeDecider &cpy)" -->
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<td class="memname">dirac::ModeDecider::ModeDecider </td>
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<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="a22edd6a16b80117a5137dff0758d365"></a><!-- doxytag: member="dirac::ModeDecider::DoLevelDecn" ref="a22edd6a16b80117a5137dff0758d365" args="(int level)" -->
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<td class="memname">void dirac::ModeDecider::DoLevelDecn </td>
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<td class="paramtype">int </td>
<td class="paramname"> <em>level</em> </td>
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<a class="anchor" name="891dca9c8c51f3d224f1f2fb465e17bb"></a><!-- doxytag: member="dirac::ModeDecider::DoME" ref="891dca9c8c51f3d224f1f2fb465e17bb" args="(const int xpos, const int ypos, const int level)" -->
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<td class="memname">void dirac::ModeDecider::DoME </td>
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<a class="anchor" name="ea5a08af5c4864ed7da89d99c00e1497"></a><!-- doxytag: member="dirac::ModeDecider::DoModeDecn" ref="ea5a08af5c4864ed7da89d99c00e1497" args="(EncQueue &my_buffer, int pic_num)" -->
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<td class="memname">void dirac::ModeDecider::DoModeDecn </td>
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Does the mode decision <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>my_buffer</em> </td><td>the buffer of all the relevant frames </td></tr>
<tr><td valign="top"></td><td valign="top"><em>pic_num</em> </td><td>the picture number for which motion estimation is being done </td></tr>
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<a class="anchor" name="141e7d5a61036ae2bfb4bbc415ea34b0"></a><!-- doxytag: member="dirac::ModeDecider::DoSBDecn" ref="141e7d5a61036ae2bfb4bbc415ea34b0" args="()" -->
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<td class="memname">void dirac::ModeDecider::DoSBDecn </td>
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<a class="anchor" name="9cdea8794f99c87ba79628a23fcd6d19"></a><!-- doxytag: member="dirac::ModeDecider::DoUnitDecn" ref="9cdea8794f99c87ba79628a23fcd6d19" args="(const int xpos, const int ypos, const int level)" -->
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<a class="anchor" name="aac3c27af518605d0eb9928225c17d21"></a><!-- doxytag: member="dirac::ModeDecider::GetBlockDC" ref="aac3c27af518605d0eb9928225c17d21" args="(const PicArray &pic_data, int xloc, int yloc, int split, CompSort cs)" -->
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<a class="anchor" name="99f85b80c40efda559e4d1e21fa4c826"></a><!-- doxytag: member="dirac::ModeDecider::GetDCPred" ref="99f85b80c40efda559e4d1e21fa4c826" args="(int xblock, int yblock)" -->
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<a class="anchor" name="103fb05cdfb02ac60d2bcae6d2c43cf6"></a><!-- doxytag: member="dirac::ModeDecider::GetDCVar" ref="103fb05cdfb02ac60d2bcae6d2c43cf6" args="(const ValueType dc_val, const ValueType dc_pred)" -->
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<a class="anchor" name="4e4090fd306aff714c4e3044516764cb"></a><!-- doxytag: member="dirac::ModeDecider::ModeCost" ref="4e4090fd306aff714c4e3044516764cb" args="(const int xindex, const int yindex)" -->
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<a class="anchor" name="199ae680080d4520b84b194828d2e930"></a><!-- doxytag: member="dirac::ModeDecider::operator=" ref="199ae680080d4520b84b194828d2e930" args="(const ModeDecider &rhs)" -->
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<td class="memname"><a class="el" href="a00085.html">ModeDecider</a>& dirac::ModeDecider::operator= </td>
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<td class="paramtype">const <a class="el" href="a00085.html">ModeDecider</a> & </td>
<td class="paramname"> <em>rhs</em> </td>
<td> ) </td>
<td><code> [private]</code></td>
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<a class="anchor" name="9e2f8267da9507ec27de3bccc8f25beb"></a><!-- doxytag: member="dirac::ModeDecider::SetDC" ref="9e2f8267da9507ec27de3bccc8f25beb" args="(const PicArray &pic_data, MEData &me_data, CompSort cs)" -->
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<td class="memname">void dirac::ModeDecider::SetDC </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="a00107.html">PicArray</a> & </td>
<td class="paramname"> <em>pic_data</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype"><a class="el" href="a00082.html">MEData</a> & </td>
<td class="paramname"> <em>me_data</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype"><a class="el" href="a00234.html#39dd89c4c7484412efd87d41548271cd">CompSort</a> </td>
<td class="paramname"> <em>cs</em></td><td> </td>
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<td>)</td>
<td></td><td></td><td><code> [private]</code></td>
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<a class="anchor" name="8f7178a4d3d160f04e422daa2faae77f"></a><!-- doxytag: member="dirac::ModeDecider::SetDC" ref="8f7178a4d3d160f04e422daa2faae77f" args="(EncQueue &my_buffer, int pic_num)" -->
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<td class="memname">void dirac::ModeDecider::SetDC </td>
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<td class="paramtype"><a class="el" href="a00065.html">EncQueue</a> & </td>
<td class="paramname"> <em>my_buffer</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"> <em>pic_num</em></td><td> </td>
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<td></td><td></td><td><code> [private]</code></td>
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<hr><h2>Member Data Documentation</h2>
<a class="anchor" name="992b0eec017f995b5f337ca97a343ce9"></a><!-- doxytag: member="dirac::ModeDecider::m_bicheckdiff" ref="992b0eec017f995b5f337ca97a343ce9" args="" -->
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<td class="memname"><a class="el" href="a00004.html">BiBlockDiff</a>* <a class="el" href="a00085.html#992b0eec017f995b5f337ca97a343ce9">dirac::ModeDecider::m_bicheckdiff</a><code> [private]</code> </td>
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<a class="anchor" name="957f0c1240acc79cbc6606c31a2ccc81"></a><!-- doxytag: member="dirac::ModeDecider::m_encparams" ref="957f0c1240acc79cbc6606c31a2ccc81" args="" -->
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<td class="memname">const <a class="el" href="a00063.html">EncoderParams</a>& <a class="el" href="a00085.html#957f0c1240acc79cbc6606c31a2ccc81">dirac::ModeDecider::m_encparams</a><code> [private]</code> </td>
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<a class="anchor" name="2c824439a4c4f94e3967378ba1e22788"></a><!-- doxytag: member="dirac::ModeDecider::m_intradiff" ref="2c824439a4c4f94e3967378ba1e22788" args="" -->
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<td class="memname"><a class="el" href="a00078.html">IntraBlockDiff</a>* <a class="el" href="a00085.html#2c824439a4c4f94e3967378ba1e22788">dirac::ModeDecider::m_intradiff</a><code> [private]</code> </td>
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<a class="anchor" name="1271f4d6d56fd7812ab6a9240ac92ba0"></a><!-- doxytag: member="dirac::ModeDecider::m_lambda" ref="1271f4d6d56fd7812ab6a9240ac92ba0" args="" -->
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<td class="memname">float <a class="el" href="a00085.html#1271f4d6d56fd7812ab6a9240ac92ba0">dirac::ModeDecider::m_lambda</a><code> [private]</code> </td>
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<a class="anchor" name="0dc2d25973772f82d777aca337104f55"></a><!-- doxytag: member="dirac::ModeDecider::m_level_factor" ref="0dc2d25973772f82d777aca337104f55" args="" -->
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<td class="memname"><a class="el" href="a00097.html">OneDArray</a><float> <a class="el" href="a00085.html#0dc2d25973772f82d777aca337104f55">dirac::ModeDecider::m_level_factor</a><code> [private]</code> </td>
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<a class="anchor" name="4e62b40e23cf8dd8f6926bd294704133"></a><!-- doxytag: member="dirac::ModeDecider::m_me_data_set" ref="4e62b40e23cf8dd8f6926bd294704133" args="" -->
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<td class="memname"><a class="el" href="a00097.html">OneDArray</a>< <a class="el" href="a00082.html">MEData</a>* > <a class="el" href="a00085.html#4e62b40e23cf8dd8f6926bd294704133">dirac::ModeDecider::m_me_data_set</a><code> [private]</code> </td>
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<a class="anchor" name="87fc96b0a8b9c3e5a1719cd4b4debf16"></a><!-- doxytag: member="dirac::ModeDecider::m_mode_factor" ref="87fc96b0a8b9c3e5a1719cd4b4debf16" args="" -->
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<td class="memname"><a class="el" href="a00097.html">OneDArray</a><float> <a class="el" href="a00085.html#87fc96b0a8b9c3e5a1719cd4b4debf16">dirac::ModeDecider::m_mode_factor</a><code> [private]</code> </td>
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<a class="anchor" name="e1178fd2db1b78ca449e75f2cab3bd5b"></a><!-- doxytag: member="dirac::ModeDecider::m_pic_data" ref="e1178fd2db1b78ca449e75f2cab3bd5b" args="" -->
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<td class="memname">const <a class="el" href="a00107.html">PicArray</a>* <a class="el" href="a00085.html#e1178fd2db1b78ca449e75f2cab3bd5b">dirac::ModeDecider::m_pic_data</a><code> [private]</code> </td>
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<a class="anchor" name="1fbb4f66f792c0056f06c5c615d4baf7"></a><!-- doxytag: member="dirac::ModeDecider::m_predparams" ref="1fbb4f66f792c0056f06c5c615d4baf7" args="" -->
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<td class="memname">const <a class="el" href="a00114.html">PicturePredParams</a>* <a class="el" href="a00085.html#1fbb4f66f792c0056f06c5c615d4baf7">dirac::ModeDecider::m_predparams</a><code> [private]</code> </td>
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<a class="anchor" name="6b861899043a9571d0e0a1154310d8de"></a><!-- doxytag: member="dirac::ModeDecider::m_psort" ref="6b861899043a9571d0e0a1154310d8de" args="" -->
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<td class="memname"><a class="el" href="a00115.html">PictureSort</a> <a class="el" href="a00085.html#6b861899043a9571d0e0a1154310d8de">dirac::ModeDecider::m_psort</a><code> [private]</code> </td>
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<a class="anchor" name="9bba52c4c71051bb5b1901475246e7c2"></a><!-- doxytag: member="dirac::ModeDecider::m_ref1_updata" ref="9bba52c4c71051bb5b1901475246e7c2" args="" -->
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<td class="memname">const <a class="el" href="a00107.html">PicArray</a>* <a class="el" href="a00085.html#9bba52c4c71051bb5b1901475246e7c2">dirac::ModeDecider::m_ref1_updata</a><code> [private]</code> </td>
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<a class="anchor" name="b547ba0aacc3fb23450e431470df272d"></a><!-- doxytag: member="dirac::ModeDecider::m_ref2_updata" ref="b547ba0aacc3fb23450e431470df272d" args="" -->
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<td class="memname">const <a class="el" href="a00107.html">PicArray</a>* <a class="el" href="a00085.html#b547ba0aacc3fb23450e431470df272d">dirac::ModeDecider::m_ref2_updata</a><code> [private]</code> </td>
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<a class="anchor" name="6ae903cd1e4079f8f274a648a34a21dc"></a><!-- doxytag: member="dirac::ModeDecider::m_xsb_loc" ref="6ae903cd1e4079f8f274a648a34a21dc" args="" -->
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<td class="memname">int <a class="el" href="a00085.html#6ae903cd1e4079f8f274a648a34a21dc">dirac::ModeDecider::m_xsb_loc</a><code> [private]</code> </td>
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<a class="anchor" name="d5367eb68fe3402961d90984dd8465cb"></a><!-- doxytag: member="dirac::ModeDecider::m_ysb_loc" ref="d5367eb68fe3402961d90984dd8465cb" args="" -->
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<td class="memname">int <a class="el" href="a00085.html#d5367eb68fe3402961d90984dd8465cb">dirac::ModeDecider::m_ysb_loc</a><code> [private]</code> </td>
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<a class="anchor" name="0feb345b4fb798323a569130f80779ee"></a><!-- doxytag: member="dirac::ModeDecider::num_refs" ref="0feb345b4fb798323a569130f80779ee" args="" -->
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<td class="memname">int <a class="el" href="a00085.html#0feb345b4fb798323a569130f80779ee">dirac::ModeDecider::num_refs</a><code> [private]</code> </td>
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<hr>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="a00194_source.html">me_mode_decn.h</a></ul>
</div>
<hr>
<p align="center"><small>
© 2004 British Broadcasting Corporation.
Dirac code licensed under the <a href="http://www.mozilla.org/MPL/">Mozilla Public License (MPL) Version 1.1</a>.<br>
HTML documentation generated by Dimitri van Heesch's
excellent <a href="http://www.doxygen.org">Doxygen</a> tool.
</small></p>
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distrib
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