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<title>GNU Radio 3.2.2 C++ API: gr_sync_block Class Reference</title>
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<a href="#pub-methods">Public Member Functions</a> |
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<h1>gr_sync_block Class Reference<div class="ingroups"><a class="el" href="group__base__blk.html">Base classes for GR Blocks</a></div></h1> </div>
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<p>synchronous 1:1 input to output with historyOverride work to provide the signal processing implementation.
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<p><code>#include <<a class="el" href="gr__sync__block_8h_source.html">gr_sync_block.h</a>></code></p>
<p>Inherits <a class="el" href="classgr__block.html">gr_block</a>.</p>
<p>Inherited by <a class="el" href="classaudio__alsa__sink.html">audio_alsa_sink</a>, <a class="el" href="classaudio__alsa__source.html">audio_alsa_source</a>, <a class="el" href="classaudio__jack__sink.html">audio_jack_sink</a>, <a class="el" href="classaudio__jack__source.html">audio_jack_source</a>, <a class="el" href="classaudio__oss__sink.html">audio_oss_sink</a>, <a class="el" href="classaudio__oss__source.html">audio_oss_source</a>, <a class="el" href="classaudio__osx__sink.html">audio_osx_sink</a>, <a class="el" href="classaudio__osx__source.html">audio_osx_source</a>, <a class="el" href="classaudio__portaudio__sink.html">audio_portaudio_sink</a>, <a class="el" href="classaudio__portaudio__source.html">audio_portaudio_source</a>, <a class="el" href="classaudio__windows__sink.html">audio_windows_sink</a>, <a class="el" href="classaudio__windows__source.html">audio_windows_source</a>, <a class="el" href="classgr__add__cc.html">gr_add_cc</a>, <a class="el" href="classgr__add__const__cc.html">gr_add_const_cc</a>, <a class="el" href="classgr__add__const__ff.html">gr_add_const_ff</a>, <a class="el" href="classgr__add__const__ii.html">gr_add_const_ii</a>, <a class="el" href="classgr__add__const__sf.html">gr_add_const_sf</a>, <a class="el" href="classgr__add__const__ss.html">gr_add_const_ss</a>, <a class="el" href="classgr__add__const__vcc.html">gr_add_const_vcc</a>, <a class="el" href="classgr__add__const__vff.html">gr_add_const_vff</a>, <a class="el" href="classgr__add__const__vii.html">gr_add_const_vii</a>, <a class="el" href="classgr__add__const__vss.html">gr_add_const_vss</a>, <a class="el" href="classgr__add__ff.html">gr_add_ff</a>, <a class="el" href="classgr__add__ii.html">gr_add_ii</a>, <a class="el" href="classgr__add__ss.html">gr_add_ss</a>, <a class="el" href="classgr__agc2__cc.html">gr_agc2_cc</a>, <a class="el" href="classgr__agc2__ff.html">gr_agc2_ff</a>, <a class="el" href="classgr__agc__cc.html">gr_agc_cc</a>, <a class="el" href="classgr__agc__ff.html">gr_agc_ff</a>, <a class="el" href="classgr__and__bb.html">gr_and_bb</a>, <a class="el" href="classgr__and__const__bb.html">gr_and_const_bb</a>, <a class="el" href="classgr__and__const__ii.html">gr_and_const_ii</a>, <a class="el" href="classgr__and__const__ss.html">gr_and_const_ss</a>, <a class="el" href="classgr__and__ii.html">gr_and_ii</a>, <a class="el" href="classgr__and__ss.html">gr_and_ss</a>, <a class="el" href="classgr__argmax__fs.html">gr_argmax_fs</a>, <a class="el" href="classgr__argmax__is.html">gr_argmax_is</a>, <a class="el" href="classgr__argmax__ss.html">gr_argmax_ss</a>, <a class="el" href="classgr__bin__statistics__f.html">gr_bin_statistics_f</a>, <a class="el" href="classgr__binary__slicer__fb.html">gr_binary_slicer_fb</a>, <a class="el" href="classgr__char__to__float.html">gr_char_to_float</a>, <a class="el" href="classgr__check__counting__s.html">gr_check_counting_s</a>, <a class="el" href="classgr__check__lfsr__32k__s.html">gr_check_lfsr_32k_s</a>, <a class="el" href="classgr__complex__to__arg.html">gr_complex_to_arg</a>, <a class="el" href="classgr__complex__to__float.html">gr_complex_to_float</a>, <a class="el" href="classgr__complex__to__imag.html">gr_complex_to_imag</a>, <a class="el" href="classgr__complex__to__mag.html">gr_complex_to_mag</a>, <a class="el" href="classgr__complex__to__mag__squared.html">gr_complex_to_mag_squared</a>, <a class="el" href="classgr__complex__to__real.html">gr_complex_to_real</a>, <a class="el" href="classgr__conjugate__cc.html">gr_conjugate_cc</a>, <a class="el" href="classgr__constellation__decoder__cb.html">gr_constellation_decoder_cb</a>, <a class="el" href="classgr__correlate__access__code__bb.html">gr_correlate_access_code_bb</a>, <a class="el" href="classgr__costas__loop__cc.html">gr_costas_loop_cc</a>, <a class="el" href="classgr__delay.html">gr_delay</a>, <a class="el" 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href="classgr__peak__detector__fb.html">gr_peak_detector_fb</a>, <a class="el" href="classgr__peak__detector__ib.html">gr_peak_detector_ib</a>, <a class="el" href="classgr__peak__detector__sb.html">gr_peak_detector_sb</a>, <a class="el" href="classgr__phase__modulator__fc.html">gr_phase_modulator_fc</a>, <a class="el" href="classgr__pll__carriertracking__cc.html">gr_pll_carriertracking_cc</a>, <a class="el" href="classgr__pll__freqdet__cf.html">gr_pll_freqdet_cf</a>, <a class="el" href="classgr__pll__refout__cc.html">gr_pll_refout_cc</a>, <a class="el" href="classgr__probe__avg__mag__sqrd__c.html">gr_probe_avg_mag_sqrd_c</a>, <a class="el" href="classgr__probe__avg__mag__sqrd__cf.html">gr_probe_avg_mag_sqrd_cf</a>, <a class="el" href="classgr__probe__avg__mag__sqrd__f.html">gr_probe_avg_mag_sqrd_f</a>, <a class="el" href="classgr__probe__density__b.html">gr_probe_density_b</a>, <a class="el" href="classgr__probe__mpsk__snr__c.html">gr_probe_mpsk_snr_c</a>, <a class="el" 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href="classtrellis__encoder__bs.html">trellis_encoder_bs</a>, <a class="el" href="classtrellis__encoder__ii.html">trellis_encoder_ii</a>, <a class="el" href="classtrellis__encoder__si.html">trellis_encoder_si</a>, <a class="el" href="classtrellis__encoder__ss.html">trellis_encoder_ss</a>, <a class="el" href="classtrellis__permutation.html">trellis_permutation</a>, <a class="el" href="classusrp2__base.html">usrp2_base</a>, <a class="el" href="classusrp__base.html">usrp_base</a>, <a class="el" href="classvideo__sdl__sink__s.html">video_sdl_sink_s</a>, and <a class="el" href="classvideo__sdl__sink__uc.html">video_sdl_sink_uc</a>.</p>
<p><a href="classgr__sync__block-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgr__sync__block.html#a0c523f4285a6eb690f677ee6295ab117">work</a> (int noutput_items, <a class="el" href="classstd_1_1vector.html">gr_vector_const_void_star</a> &input_items, <a class="el" href="classstd_1_1vector.html">gr_vector_void_star</a> &output_items)=0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">just like <a class="el" href="classgr__block.html#a137b93d87dc83bbdb6369d33f4ea8197" title="compute output items from input items">gr_block::general_work</a>, only this arranges to call consume_each for you <a href="#a0c523f4285a6eb690f677ee6295ab117"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classgr__sync__block.html#a1327e83509baf039aa3c816ea81a8f22">forecast</a> (int noutput_items, <a class="el" href="classstd_1_1vector.html">gr_vector_int</a> &ninput_items_required)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Estimate input requirements given output request. <a href="#a1327e83509baf039aa3c816ea81a8f22"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgr__sync__block.html#a56ca60b6bc20a3510f71d961891fa81b">general_work</a> (int noutput_items, <a class="el" href="classstd_1_1vector.html">gr_vector_int</a> &ninput_items, <a class="el" href="classstd_1_1vector.html">gr_vector_const_void_star</a> &input_items, <a class="el" href="classstd_1_1vector.html">gr_vector_void_star</a> &output_items)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">compute output items from input items <a href="#a56ca60b6bc20a3510f71d961891fa81b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgr__sync__block.html#a0cbbc0ce275498411248e678038710b2">fixed_rate_ninput_to_noutput</a> (int ninput)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Given ninput samples, return number of output samples that will be produced. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this. <a href="#a0cbbc0ce275498411248e678038710b2"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classgr__sync__block.html#adaecb00ae09408c22e46c44d09aad53e">fixed_rate_noutput_to_ninput</a> (int noutput)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Given noutput samples, return number of input samples required to produce noutput. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this. <a href="#adaecb00ae09408c22e46c44d09aad53e"></a><br/></td></tr>
<tr><td colspan="2"><h2><a name="pro-methods"></a>
Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classgr__sync__block.html#a832d8dad2dbd38e8e9cfa0b954d37c87">gr_sync_block</a> (const std::string &name, <a class="el" href="classboost_1_1shared__ptr.html">gr_io_signature_sptr</a> input_signature, <a class="el" href="classboost_1_1shared__ptr.html">gr_io_signature_sptr</a> output_signature)</td></tr>
</table>
<hr/><a name="_details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>synchronous 1:1 input to output with history</p>
<p>Override work to provide the signal processing implementation. </p>
</div><hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="a832d8dad2dbd38e8e9cfa0b954d37c87"></a><!-- doxytag: member="gr_sync_block::gr_sync_block" ref="a832d8dad2dbd38e8e9cfa0b954d37c87" args="(const std::string &name, gr_io_signature_sptr input_signature, gr_io_signature_sptr output_signature)" -->
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<td class="memname">gr_sync_block::gr_sync_block </td>
<td>(</td>
<td class="paramtype">const std::string & </td>
<td class="paramname"><em>name</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classboost_1_1shared__ptr.html">gr_io_signature_sptr</a> </td>
<td class="paramname"><em>input_signature</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classboost_1_1shared__ptr.html">gr_io_signature_sptr</a> </td>
<td class="paramname"><em>output_signature</em> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td><code> [protected]</code></td>
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</div>
<div class="memdoc">
</div>
</div>
<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="a0cbbc0ce275498411248e678038710b2"></a><!-- doxytag: member="gr_sync_block::fixed_rate_ninput_to_noutput" ref="a0cbbc0ce275498411248e678038710b2" args="(int ninput)" -->
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<td class="memname">int gr_sync_block::fixed_rate_ninput_to_noutput </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>ninput</em></td><td>)</td>
<td><code> [virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Given ninput samples, return number of output samples that will be produced. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this. </p>
<p>Reimplemented from <a class="el" href="classgr__block.html#a4f17bec4407904b31d45f0d8e78c4683">gr_block</a>.</p>
<p>Reimplemented in <a class="el" href="classgr__sync__decimator.html#a23c657d3c3f0482369648e1916751f6f">gr_sync_decimator</a>, and <a class="el" href="classgr__sync__interpolator.html#a943227c6134e71a7867a66977b414533">gr_sync_interpolator</a>.</p>
</div>
</div>
<a class="anchor" id="adaecb00ae09408c22e46c44d09aad53e"></a><!-- doxytag: member="gr_sync_block::fixed_rate_noutput_to_ninput" ref="adaecb00ae09408c22e46c44d09aad53e" args="(int noutput)" -->
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<td class="memname">int gr_sync_block::fixed_rate_noutput_to_ninput </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>noutput</em></td><td>)</td>
<td><code> [virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>Given noutput samples, return number of input samples required to produce noutput. N.B. this is only defined if fixed_rate returns true. Generally speaking, you don't need to override this. </p>
<p>Reimplemented from <a class="el" href="classgr__block.html#a196ae6a4f9a3d0abed3428d2b765a133">gr_block</a>.</p>
<p>Reimplemented in <a class="el" href="classgr__sync__decimator.html#a90041d67e72c64cb4d0f9a29bfbbd776">gr_sync_decimator</a>, and <a class="el" href="classgr__sync__interpolator.html#a03961e37cf520668a87f53762e638b9f">gr_sync_interpolator</a>.</p>
</div>
</div>
<a class="anchor" id="a1327e83509baf039aa3c816ea81a8f22"></a><!-- doxytag: member="gr_sync_block::forecast" ref="a1327e83509baf039aa3c816ea81a8f22" args="(int noutput_items, gr_vector_int &ninput_items_required)" -->
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<td class="memname">void gr_sync_block::forecast </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>noutput_items</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classstd_1_1vector.html">gr_vector_int</a> & </td>
<td class="paramname"><em>ninput_items_required</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td><code> [virtual]</code></td>
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</table>
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<div class="memdoc">
<p>Estimate input requirements given output request. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">noutput_items</td><td>number of output items to produce </td></tr>
<tr><td class="paramname">ninput_items_required</td><td>number of input items required on each input stream</td></tr>
</table>
</dd>
</dl>
<p>Given a request to product <code>noutput_items</code>, estimate the number of data items required on each input stream. The estimate doesn't have to be exact, but should be close. </p>
<p>Reimplemented from <a class="el" href="classgr__block.html#aa1f2518b5c97126bb015adb9e2027f4a">gr_block</a>.</p>
<p>Reimplemented in <a class="el" href="classgr__sync__decimator.html#a140792c0a9777b6b82eb220cdd424ecd">gr_sync_decimator</a>, and <a class="el" href="classgr__sync__interpolator.html#a81ef017ef4ec17d0808cd1c0e2ceb803">gr_sync_interpolator</a>.</p>
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</div>
<a class="anchor" id="a56ca60b6bc20a3510f71d961891fa81b"></a><!-- doxytag: member="gr_sync_block::general_work" ref="a56ca60b6bc20a3510f71d961891fa81b" args="(int noutput_items, gr_vector_int &ninput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)" -->
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<td class="memname">int gr_sync_block::general_work </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>noutput_items</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classstd_1_1vector.html">gr_vector_int</a> & </td>
<td class="paramname"><em>ninput_items</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classstd_1_1vector.html">gr_vector_const_void_star</a> & </td>
<td class="paramname"><em>input_items</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classstd_1_1vector.html">gr_vector_void_star</a> & </td>
<td class="paramname"><em>output_items</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td><code> [virtual]</code></td>
</tr>
</table>
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<div class="memdoc">
<p>compute output items from input items </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">noutput_items</td><td>number of output items to write on each output stream </td></tr>
<tr><td class="paramname">ninput_items</td><td>number of input items available on each input stream </td></tr>
<tr><td class="paramname">input_items</td><td>vector of pointers to the input items, one entry per input stream </td></tr>
<tr><td class="paramname">output_items</td><td>vector of pointers to the output items, one entry per output stream</td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>number of items actually written to each output stream, or -1 on EOF. It is OK to return a value less than noutput_items. -1 <= return value <= noutput_items</dd></dl>
<p>general_work must call consume or consume_each to indicate how many items were consumed on each input stream. </p>
<p>Implements <a class="el" href="classgr__block.html#a137b93d87dc83bbdb6369d33f4ea8197">gr_block</a>.</p>
<p>Reimplemented in <a class="el" href="classgr__sync__decimator.html#a3a7d9a6487780922c14cbb76d46a0586">gr_sync_decimator</a>, and <a class="el" href="classgr__sync__interpolator.html#a49cd2967b214ead14270d97dab932301">gr_sync_interpolator</a>.</p>
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</div>
<a class="anchor" id="a0c523f4285a6eb690f677ee6295ab117"></a><!-- doxytag: member="gr_sync_block::work" ref="a0c523f4285a6eb690f677ee6295ab117" args="(int noutput_items, gr_vector_const_void_star &input_items, gr_vector_void_star &output_items)=0" -->
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<td class="memname">virtual int gr_sync_block::work </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>noutput_items</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classstd_1_1vector.html">gr_vector_const_void_star</a> & </td>
<td class="paramname"><em>input_items</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classstd_1_1vector.html">gr_vector_void_star</a> & </td>
<td class="paramname"><em>output_items</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td><code> [pure virtual]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>just like <a class="el" href="classgr__block.html#a137b93d87dc83bbdb6369d33f4ea8197" title="compute output items from input items">gr_block::general_work</a>, only this arranges to call consume_each for you </p>
<p>The user must override work to define the signal processing code </p>
<p>Implemented in <a class="el" href="classgr__adaptive__fir__ccf.html#a3e0c0093311ba2d108be83ad690e671e">gr_adaptive_fir_ccf</a>, <a class="el" href="classgr__fft__filter__ccc.html#abd58d53cb31556211a6f12e9608229a4">gr_fft_filter_ccc</a>, <a class="el" href="classgr__fft__filter__fff.html#a60fe0a91b40454b63840966b91b5b10b">gr_fft_filter_fff</a>, <a class="el" href="classgr__filter__delay__fc.html#a9bad0ff0d4b0645287016eb3b2ab33e5">gr_filter_delay_fc</a>, <a class="el" href="classgr__fir__filter__ccc.html#a1def3374fa5d9126bb593f5ed2b3c134">gr_fir_filter_ccc</a>, <a class="el" href="classgr__fir__filter__ccf.html#a9f5c79e499f7fd722be1e21f0753d3a1">gr_fir_filter_ccf</a>, <a class="el" href="classgr__fir__filter__fcc.html#a834d57afe98f2f9f84e08b0b2ce4fd10">gr_fir_filter_fcc</a>, <a class="el" href="classgr__fir__filter__fff.html#a0b17f0f4890a7c00e49fafc8cf4e0fc3">gr_fir_filter_fff</a>, <a class="el" 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