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 <span id="projectnumber">0.4.1</span>
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<div class="title">decoding.c</div> </div>
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<div class="fragment"><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment"> This shows the steps necessary to encode a Kate stream.</span></div><div class="line"><span class="comment"> For clarity, error checking is omitted.</span></div><div class="line"><span class="comment"> For simplicity, the input is assumed to be a single Kate stream.</span></div><div class="line"><span class="comment"> Usually, Kate streams will be multiplexed with other streams (either</span></div><div class="line"><span class="comment"> other Kate streams, or audio, or video). In these cases, the Ogg</span></div><div class="line"><span class="comment"> part will have to be more complex, but the Kate specific code will</span></div><div class="line"><span class="comment"> be the same.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include <stdio.h></span></div><div class="line"><span class="preprocessor">#include <string.h></span></div><div class="line"><span class="preprocessor">#include "common.h"</span></div><div class="line"></div><div class="line"><span class="comment">/* All the libkate API is available from the main kate header file: */</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include <<a class="code" href="oggkate_8h.html">kate/oggkate.h</a>></span></div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main()</div><div class="line">{</div><div class="line"> ogg_sync_state oy;</div><div class="line"> ogg_stream_state os;</div><div class="line"> <span class="keywordtype">int</span> init=0;</div><div class="line"> ogg_packet op;</div><div class="line"> <a name="_a0"></a><a class="code" href="structkate__state.html">kate_state</a> k;</div><div class="line"> <a name="_a1"></a><a class="code" href="structkate__info.html">kate_info</a> ki;</div><div class="line"> <a name="_a2"></a><a class="code" href="structkate__comment.html">kate_comment</a> kc;</div><div class="line"> <span class="keyword">const</span> <a name="_a3"></a><a class="code" href="structkate__event.html">kate_event</a> *ev;</div><div class="line"></div><div class="line"> <span class="comment">/* for the benefit of windows, which mangles data otherwise */</span></div><div class="line"> set_binary_file(stdin);</div><div class="line"></div><div class="line"> <span class="comment">/* we initialize ogg and kate info/comment structures */</span></div><div class="line"> ogg_sync_init(&oy);</div><div class="line"> <a name="a4"></a><a class="code" href="group__info.html#gab9031b2c167954bc7d754b30774f0241">kate_info_init</a>(&ki);</div><div class="line"> <a name="a5"></a><a class="code" href="group__comments.html#ga4f717746ed53e557e57bb1e2b40dbd84">kate_comment_init</a>(&kc);</div><div class="line"></div><div class="line"> <span class="comment">/*</span></div><div class="line"><span class="comment"> First, read the headers, which must appear first in a Kate stream. When</span></div><div class="line"><span class="comment"> kate_decode_header returns a positive number, all headers have been seen</span></div><div class="line"><span class="comment"> and we're ready to decode data.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"> <span class="keywordflow">do</span> {</div><div class="line"> get_packet(&oy,&os,&init,&op);</div><div class="line"> } <span class="keywordflow">while</span> (<a name="a6"></a><a class="code" href="oggkate_8h.html#ad9a723eff7f66cadae79719d09aebd4d">kate_ogg_decode_headerin</a>(&ki,&kc,&op)==0);</div><div class="line"></div><div class="line"> <span class="comment">/*</span></div><div class="line"><span class="comment"> We now have all the information we need from the headers, so we can</span></div><div class="line"><span class="comment"> initialize kate for decoding</span></div><div class="line"><span class="comment"> */</span></div><div class="line"> <a name="a7"></a><a class="code" href="group__decoding.html#gaecc12ec59e4b3256f50b5c135d4fe90f">kate_decode_init</a>(&k,&ki);</div><div class="line"></div><div class="line"> <span class="comment">/*</span></div><div class="line"><span class="comment"> We can now read data, until kate_decode_packetin returns a positive</span></div><div class="line"><span class="comment"> number, signaling the end of the stream</span></div><div class="line"><span class="comment"> */</span></div><div class="line"> <span class="keywordflow">while</span> (1) {</div><div class="line"> <span class="keywordflow">if</span> (get_packet(&oy,&os,&init,&op)) <span class="keywordflow">break</span>;</div><div class="line"> <span class="keywordflow">if</span> (<a name="a8"></a><a class="code" href="oggkate_8h.html#a66a5a414cf4ad9b094b27a78c00e83a7">kate_ogg_decode_packetin</a>(&k,&op)>0) <span class="keywordflow">break</span>;</div><div class="line"></div><div class="line"> <span class="comment">/* we may have an event (eg, text) */</span></div><div class="line"> <span class="keywordflow">if</span> (<a name="a9"></a><a class="code" href="group__decoding.html#gacdc7b2786e9fb2c8c685ebe3f483852c">kate_decode_eventout</a>(&k,&ev)==0) {</div><div class="line"> printf(<span class="stringliteral">"Kate stream has text: %s\n"</span>,ev-><a name="a10"></a><a class="code" href="structkate__event.html#ae10745a5078521816cc07a09654fbfd4">text</a>);</div><div class="line"> }</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="comment">/* That's it, we can now cleanup */</span></div><div class="line"> ogg_stream_clear(&os);</div><div class="line"> ogg_sync_clear(&oy);</div><div class="line"></div><div class="line"> <a name="a11"></a><a class="code" href="kate_8h.html#a8617b44c49f19262a9e03c0dcb45d971">kate_clear</a>(&k);</div><div class="line"> <a name="a12"></a><a class="code" href="group__info.html#gaa8ba295f7925e8926ed46510c28be60d">kate_info_clear</a>(&ki);</div><div class="line"> <a name="a13"></a><a class="code" href="group__comments.html#ga92e532be93459a5b1d6835b64c1129da">kate_comment_clear</a>(&kc);</div><div class="line"></div><div class="line"> <span class="keywordflow">return</span> 0;</div><div class="line">}</div><div class="line"></div></div><!-- fragment --> </div><!-- contents -->
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