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<h1>Teletext IDL packet demultiplexer<br>
<small>
[<a class="el" href="group__LowDec.html">Low Level Decoding</a>]</small>
</h1>Functions to decode data transmissions in Teletext Independent Data Line packets (EN 300 708 section 6).
<a href="#_details">More...</a>
<p>
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<tr><td colspan="2"><br><h2>Typedefs</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">typedef struct _vbi_idl_demux </td><td class="memItemRight" valign="bottom"><a class="el" href="group__IDLDemux.html#gafdaf9e811243a766ca641ef20ed913e">vbi_idl_demux</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">IDL demultiplexer context. <a href="#gafdaf9e811243a766ca641ef20ed913e"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">typedef vbi_bool </td><td class="memItemRight" valign="bottom"><a class="el" href="group__IDLDemux.html#gb9e661e9d49aef0d8b20d465e5915032">vbi_idl_demux_cb</a> (<a class="el" href="group__IDLDemux.html#gafdaf9e811243a766ca641ef20ed913e">vbi_idl_demux</a> *dx, const uint8_t *buffer, unsigned int n_bytes, unsigned int flags, void *user_data)</td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__IDLDemux.html#g80beb5dd0ffe1c6836c4daac6f464e3c">vbi_idl_demux_reset</a> (<a class="el" href="group__IDLDemux.html#gafdaf9e811243a766ca641ef20ed913e">vbi_idl_demux</a> *dx) _vbi_nonnull((1))</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">vbi_bool </td><td class="memItemRight" valign="bottom"><a class="el" href="group__IDLDemux.html#g490f1961add5aa7d0f27b3fd913f2f59">vbi_idl_demux_feed</a> (<a class="el" href="group__IDLDemux.html#gafdaf9e811243a766ca641ef20ed913e">vbi_idl_demux</a> *dx, const uint8_t buffer[42])</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">vbi_bool </td><td class="memItemRight" valign="bottom"><a class="el" href="group__IDLDemux.html#gcc00454d5f855751aa360470cefc0e7e">vbi_idl_demux_feed_frame</a> (<a class="el" href="group__IDLDemux.html#gafdaf9e811243a766ca641ef20ed913e">vbi_idl_demux</a> *dx, const <a class="el" href="structvbi__sliced.html">vbi_sliced</a> *sliced, unsigned int n_lines)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__IDLDemux.html#gd92399bea4dd2303046d3df978243db8">vbi_idl_demux_delete</a> (<a class="el" href="group__IDLDemux.html#gafdaf9e811243a766ca641ef20ed913e">vbi_idl_demux</a> *dx)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="group__IDLDemux.html#gafdaf9e811243a766ca641ef20ed913e">vbi_idl_demux</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__IDLDemux.html#g350eeab053043ecdb7219a902e7e1475">vbi_idl_a_demux_new</a> (unsigned int channel, unsigned int address, <a class="el" href="group__IDLDemux.html#gb9e661e9d49aef0d8b20d465e5915032">vbi_idl_demux_cb</a> *callback, void *user_data)</td></tr>
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<hr><a name="_details"></a><h2>Detailed Description</h2>
Functions to decode data transmissions in Teletext Independent Data Line packets (EN 300 708 section 6). <hr><h2>Typedef Documentation</h2>
<a class="anchor" name="gafdaf9e811243a766ca641ef20ed913e"></a><!-- doxytag: member="idl_demux.h::vbi_idl_demux" ref="gafdaf9e811243a766ca641ef20ed913e" args="" -->
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<td class="memname">typedef struct _vbi_idl_demux <a class="el" href="group__IDLDemux.html#gafdaf9e811243a766ca641ef20ed913e">vbi_idl_demux</a> </td>
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<p>
IDL demultiplexer context.
<p>
The contents of this structure are private.<p>
Call vbi_idl_demux_new() to allocate an IDL demultiplexer context.
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<a class="anchor" name="gb9e661e9d49aef0d8b20d465e5915032"></a><!-- doxytag: member="idl_demux.h::vbi_idl_demux_cb" ref="gb9e661e9d49aef0d8b20d465e5915032" args="(vbi_idl_demux *dx, const uint8_t *buffer, unsigned int n_bytes, unsigned int flags, void *user_data)" -->
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<td class="memname">typedef vbi_bool <a class="el" href="group__IDLDemux.html#gb9e661e9d49aef0d8b20d465e5915032">vbi_idl_demux_cb</a>(<a class="el" href="group__IDLDemux.html#gafdaf9e811243a766ca641ef20ed913e">vbi_idl_demux</a> *dx, const uint8_t *buffer, unsigned int n_bytes, unsigned int flags, void *user_data) </td>
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<tr><td valign="top"></td><td valign="top"><em>dx</em> </td><td>IDL demultiplexer returned by <a class="el" href="group__IDLDemux.html#g350eeab053043ecdb7219a902e7e1475">vbi_idl_a_demux_new()</a> and given to <a class="el" href="group__IDLDemux.html#g490f1961add5aa7d0f27b3fd913f2f59">vbi_idl_demux_feed()</a>. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>buffer</em> </td><td>Pointer to received user data. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>n_bytes</em> </td><td>Number of bytes in the buffer. Can be <code>0</code> if the decoded packet did not contain user data. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>flags</em> </td><td><code>VBI_IDL_DATA_LOST</code>, <code>VBI_IDL_DEPENDENT</code>. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>user_data</em> </td><td>User pointer passed to vbi_idl_demux_new().</td></tr>
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The <a class="el" href="group__IDLDemux.html#g490f1961add5aa7d0f27b3fd913f2f59">vbi_idl_demux_feed()</a> function calls a function of this type after successfully decoding an IDL packet.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>FALSE to abort <a class="el" href="group__IDLDemux.html#g490f1961add5aa7d0f27b3fd913f2f59">vbi_idl_demux_feed()</a> and return FALSE. </dd></dl>
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<hr><h2>Function Documentation</h2>
<a class="anchor" name="g80beb5dd0ffe1c6836c4daac6f464e3c"></a><!-- doxytag: member="idl_demux.h::vbi_idl_demux_reset" ref="g80beb5dd0ffe1c6836c4daac6f464e3c" args="(vbi_idl_demux *dx) _vbi_nonnull((1))" -->
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<td class="memname">void vbi_idl_demux_reset </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__IDLDemux.html#gafdaf9e811243a766ca641ef20ed913e">vbi_idl_demux</a> * </td>
<td class="paramname"> <em>dx</em> </td>
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<tr><td valign="top"></td><td valign="top"><em>dx</em> </td><td>IDL demultiplexer allocated with <a class="el" href="group__IDLDemux.html#g350eeab053043ecdb7219a902e7e1475">vbi_idl_a_demux_new()</a>.</td></tr>
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Resets the IDL demux context, useful for example after a channel change.<p>
<dl class="since" compact><dt><b>Since:</b></dt><dd>0.2.14 </dd></dl>
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<a class="anchor" name="g490f1961add5aa7d0f27b3fd913f2f59"></a><!-- doxytag: member="idl_demux.h::vbi_idl_demux_feed" ref="g490f1961add5aa7d0f27b3fd913f2f59" args="(vbi_idl_demux *dx, const uint8_t buffer[42])" -->
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<td class="memname">vbi_bool vbi_idl_demux_feed </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__IDLDemux.html#gafdaf9e811243a766ca641ef20ed913e">vbi_idl_demux</a> * </td>
<td class="paramname"> <em>dx</em>, </td>
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<td class="paramtype">const uint8_t </td>
<td class="paramname"> <em>buffer</em>[42]</td><td> </td>
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<td>)</td>
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<tr><td valign="top"></td><td valign="top"><em>dx</em> </td><td>IDL demultiplexer allocated with <a class="el" href="group__IDLDemux.html#g350eeab053043ecdb7219a902e7e1475">vbi_idl_a_demux_new()</a>. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>buffer</em> </td><td>Teletext packet (last 42 bytes, i. e. without clock run-in and framing code), as in struct <a class="el" href="structvbi__sliced.html" title="This structure holds one scan line of sliced vbi data.">vbi_sliced</a>.</td></tr>
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This function takes a stream of Teletext packets, filters out packets of the desired data channel and address and calls the output function given to <a class="el" href="group__IDLDemux.html#g350eeab053043ecdb7219a902e7e1475">vbi_idl_a_demux_new()</a> when new user data is available.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>FALSE if the packet contained incorrectable errors.</dd></dl>
<dl class="since" compact><dt><b>Since:</b></dt><dd>0.2.14 </dd></dl>
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<a class="anchor" name="gcc00454d5f855751aa360470cefc0e7e"></a><!-- doxytag: member="idl_demux.h::vbi_idl_demux_feed_frame" ref="gcc00454d5f855751aa360470cefc0e7e" args="(vbi_idl_demux *dx, const vbi_sliced *sliced, unsigned int n_lines)" -->
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<td class="memname">vbi_bool vbi_idl_demux_feed_frame </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__IDLDemux.html#gafdaf9e811243a766ca641ef20ed913e">vbi_idl_demux</a> * </td>
<td class="paramname"> <em>dx</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structvbi__sliced.html">vbi_sliced</a> * </td>
<td class="paramname"> <em>sliced</em>, </td>
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<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>n_lines</em></td><td> </td>
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<td>)</td>
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<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dx</em> </td><td>IDL demultiplexer allocated with <a class="el" href="group__IDLDemux.html#g350eeab053043ecdb7219a902e7e1475">vbi_idl_a_demux_new()</a>. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>sliced</em> </td><td>Sliced VBI data. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>n_lines</em> </td><td>Number of lines in the <em>sliced</em> array.</td></tr>
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This function works like <a class="el" href="group__IDLDemux.html#g490f1961add5aa7d0f27b3fd913f2f59">vbi_idl_demux_feed()</a> but operates on sliced VBI data and filters out <code>VBI_SLICED_TELETEXT_B_625</code>.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>FALSE if any Teletext lines contained incorrectable errors.</dd></dl>
<dl class="since" compact><dt><b>Since:</b></dt><dd>0.2.26 </dd></dl>
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<a class="anchor" name="gd92399bea4dd2303046d3df978243db8"></a><!-- doxytag: member="idl_demux.h::vbi_idl_demux_delete" ref="gd92399bea4dd2303046d3df978243db8" args="(vbi_idl_demux *dx)" -->
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<td class="memname">void vbi_idl_demux_delete </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__IDLDemux.html#gafdaf9e811243a766ca641ef20ed913e">vbi_idl_demux</a> * </td>
<td class="paramname"> <em>dx</em> </td>
<td> ) </td>
<td></td>
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<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>dx</em> </td><td>IDL demultiplexer allocated with <a class="el" href="group__IDLDemux.html#g350eeab053043ecdb7219a902e7e1475">vbi_idl_a_demux_new()</a>, can be <code>NULL</code>.</td></tr>
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Frees all resources associated with <em>dx</em>.<p>
<dl class="since" compact><dt><b>Since:</b></dt><dd>0.2.14 </dd></dl>
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<a class="anchor" name="g350eeab053043ecdb7219a902e7e1475"></a><!-- doxytag: member="idl_demux.h::vbi_idl_a_demux_new" ref="g350eeab053043ecdb7219a902e7e1475" args="(unsigned int channel, unsigned int address, vbi_idl_demux_cb *callback, void *user_data)" -->
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<td class="memname"><a class="el" href="group__IDLDemux.html#gafdaf9e811243a766ca641ef20ed913e">vbi_idl_demux</a>* vbi_idl_a_demux_new </td>
<td>(</td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>channel</em>, </td>
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<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>address</em>, </td>
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<td></td>
<td class="paramtype"><a class="el" href="group__IDLDemux.html#gb9e661e9d49aef0d8b20d465e5915032">vbi_idl_demux_cb</a> * </td>
<td class="paramname"> <em>callback</em>, </td>
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<td class="paramtype">void * </td>
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<td>)</td>
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<dl compact><dt><b>Parameters:</b></dt><dd>
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<tr><td valign="top"></td><td valign="top"><em>channel</em> </td><td>Filter out packets of this channel. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>address</em> </td><td>Filter out packets with this service data address. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>callback</em> </td><td>Function to be called by <a class="el" href="group__IDLDemux.html#g490f1961add5aa7d0f27b3fd913f2f59">vbi_idl_demux_feed()</a> when new data is available. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>user_data</em> </td><td>User pointer passed through to <em>callback</em> function.</td></tr>
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Allocates a new Independent Data Line format A (EN 300 708 section 6.5) demultiplexer.<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>Pointer to newly allocated IDL demultiplexer which must be freed with <a class="el" href="group__IDLDemux.html#gd92399bea4dd2303046d3df978243db8">vbi_idl_demux_delete()</a> when done. <code>NULL</code> on failure (out of memory).</dd></dl>
<dl class="since" compact><dt><b>Since:</b></dt><dd>0.2.14 </dd></dl>
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