aviplay_8c.html

MP3 Player Source Code

Referenced by <a class="el" href="aviplay_8c-source.html#l00144">PlayAvi()</a>.
<p>
<pre class="fragment"><div>00015                   {
00016 
00017   xdata <a class="code" href="unionAddress.html">addressType</a> instream;
00018   xdata <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> blockType = 0;
00019   bit isPadded = 0;
00020   
00021   <a class="code" href="aviplay_8c.html#a4">GetLongWord</a>();
00022   <span class="keywordflow">if</span> ((instream.b.b2 == <span class="charliteral">'w'</span>) &amp;&amp; (instream.b.b3 == <span class="charliteral">'b'</span>)){
00023     blockType = <a class="code" href="aviplay_8c.html#a3">btAUDIO</a>;
00024   }
00025   <span class="keywordflow">if</span> (instream.l==1414744396){ <span class="comment">//LIST</span>
00026     blockType = <a class="code" href="aviplay_8c.html#a1">btLIST</a>;
00027   }
00028   <a class="code" href="aviplay_8c.html#a4">GetLongWord</a>();
00029   <span class="comment">//instream.l should now contain the chunk size.</span>
00030   <span class="comment">//its length must be even by spec. if it's odd, a pad byte is </span>
00031   <span class="comment">//in the file but its NOT part of chunk data.</span>
00032   <span class="keywordflow">if</span> (instream.b.b0&amp;1){
00033     isPadded = 1; <span class="comment">//There is a pad byte to make chunk len even</span>
00034   }<span class="keywordflow">else</span>{
00035     isPadded = 0;
00036   }
00037   
00038   
00039   <span class="keywordflow">if</span> (blockType == <a class="code" href="aviplay_8c.html#a3">btAUDIO</a>){
00040     <span class="comment">//--------THIS PACKET IS SENT TO VS10xx---------</span>
00041     <span class="comment">//superbly hilarious effects could happen if the avifile has</span>
00042     <span class="comment">//more than 1 soundtrack as all of them would be sent to VS10xx</span>
00043     
00044     <span class="keywordflow">while</span>(instream.l){
00045       <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> c;
00046       
00047       <span class="keywordflow">while</span> ((instream.l&gt;16)&amp;&amp;(<a class="code" href="buffer_8c.html#a1">dataBufPtr</a> &lt; <a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o1">raw</a>.<a class="code" href="structDiskBlock_1_1Raw.html#o0">buf</a>+496)){
00048         <span class="comment">//We have at least 16 octets of continuous stream in mem.</span>
00049         <span class="keywordflow">if</span> (!<a class="code" href="board_8h.html#a9">MP3_DREQ</a>){
00050           <a class="code" href="board_8h.html#a11">GREEN_LED</a> = <a class="code" href="board_8h.html#a12">LED_ON</a>;
00051           <span class="keywordflow">while</span> (!<a class="code" href="board_8h.html#a9">MP3_DREQ</a>){
00052             <a class="code" href="board_8h.html#a8">Mp3DeselectData</a>();
00053             <a class="code" href="player_8c.html#a12">AvailableProcessorTime</a>();
00054           }
00055         }
00056         <a class="code" href="board_8h.html#a11">GREEN_LED</a> = <a class="code" href="board_8h.html#a13">LED_OFF</a>;
00057         <a class="code" href="board_8h.html#a7">Mp3SelectData</a>();
00058         <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(*dataBufPtr++);
00059         <a class="code" href="board_8h.html#a41">SPIWait</a>();
00060         <a class="code" href="board_8h.html#a42">SPIPutChar</a>(*dataBufPtr++);
00061         <a class="code" href="board_8h.html#a42">SPIPutChar</a>(*dataBufPtr++);
00062         <a class="code" href="board_8h.html#a42">SPIPutChar</a>(*dataBufPtr++);
00063         <a class="code" href="board_8h.html#a42">SPIPutChar</a>(*dataBufPtr++);
00064         <a class="code" href="board_8h.html#a42">SPIPutChar</a>(*dataBufPtr++);
00065         <a class="code" href="board_8h.html#a42">SPIPutChar</a>(*dataBufPtr++);
00066         <a class="code" href="board_8h.html#a42">SPIPutChar</a>(*dataBufPtr++);
00067         <a class="code" href="board_8h.html#a42">SPIPutChar</a>(*dataBufPtr++);
00068         <a class="code" href="board_8h.html#a42">SPIPutChar</a>(*dataBufPtr++);
00069         <a class="code" href="board_8h.html#a42">SPIPutChar</a>(*dataBufPtr++);
00070         <a class="code" href="board_8h.html#a42">SPIPutChar</a>(*dataBufPtr++);
00071         <a class="code" href="board_8h.html#a42">SPIPutChar</a>(*dataBufPtr++);
00072         <a class="code" href="board_8h.html#a42">SPIPutChar</a>(*dataBufPtr++);
00073         <a class="code" href="board_8h.html#a42">SPIPutChar</a>(*dataBufPtr++);
00074         <a class="code" href="board_8h.html#a42">SPIPutChar</a>(*dataBufPtr++);
00075         instream.l-=16;
00076         <a class="code" href="filesys_8c.html#a7">fileSize</a>-=16;
00077         <a class="code" href="board_8h.html#a41">SPIWait</a>();      
00078       }
00079             
00080       <a class="code" href="board_8h.html#a6">MP3_XDCS</a>=1;
00081       instream.l--;
00082       c=<a class="code" href="filesys_8c.html#a21">FGetChar</a>(); <span class="comment">//data comes first until end of sector and</span>
00083                     <span class="comment">//then a new sector is loaded automagically.</span>
00084       <a class="code" href="board_8h.html#a6">MP3_XDCS</a>=0;
00085       <a class="code" href="board_8h.html#a43">SPIPutCharWithoutWaiting</a>(c);
00086       <span class="comment">//SPIWait();      </span>
00087     }    
00088     <a class="code" href="board_8h.html#a6">MP3_XDCS</a>=1;
00089   }<span class="keywordflow">else</span> <span class="keywordflow">if</span> (blockType == <a class="code" href="aviplay_8c.html#a1">btLIST</a>){
00090     ConsoleWrite(<span class="stringliteral">"\rAVI: List of "</span>);
00091     <a class="code" href="aviplay_8c.html#a4">GetLongWord</a>();
00092     ConsolePutChar(instream.b.b0);
00093     ConsolePutChar(instream.b.b1);
00094     ConsolePutChar(instream.b.b2);
00095     ConsolePutChar(instream.b.b3);
00096 
00097   }<span class="keywordflow">else</span>{
00098     <span class="comment">//We don't need this chunk. Let's quickly skip over it.</span>
00099     
00100     <span class="comment">//Is pad byte insertion needed?</span>
00101     <span class="keywordflow">if</span> (isPadded){
00102       instream.l++; <span class="comment">//instream.l contains chunk size</span>
00103       isPadded = 0;
00104     }
00105 
00106     <span class="comment">//Skip to the end of sector</span>
00107     <span class="keywordflow">if</span> (instream.l&gt;(<a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o1">i</a>=<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o1">raw</a>.<a class="code" href="structDiskBlock_1_1Raw.html#o0">buf</a>+512-<a class="code" href="buffer_8c.html#a1">dataBufPtr</a>)){
00108       <span class="comment">//The packet continues after end of sector</span>
00109       instream.l -= <a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o1">i</a>;
00110       <a class="code" href="filesys_8c.html#a7">fileSize</a> -= <a class="code" href="board_8c.html#a0">temp</a>.<a class="code" href="unionTemp.html#o1">i</a>;
00111       <a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o0">l</a>++; <span class="comment">//Sector handled, go to next.</span>
00112       <a class="code" href="buffer_8c.html#a1">dataBufPtr</a> = 0; <span class="comment">//Complete sector is handled.</span>
00113     }
00114     
00115     <span class="comment">//Skip unnecessary sectors</span>
00116     <span class="keywordflow">if</span> (instream.l&gt;512){
00117       <span class="keywordflow">while</span> (instream.l&gt;512){
00118         <a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o0">l</a>++;
00119         instream.l -= 512;
00120         <a class="code" href="filesys_8c.html#a7">fileSize</a> -= 512;
00121       }
00122       <a class="code" href="buffer_8c.html#a1">dataBufPtr</a> = 0; <span class="comment">//Initialize for next call to FGetChar();</span>
00123     }
00124 
00125     <span class="comment">//Read last sector into memory</span>
00126     <span class="keywordflow">if</span> (<a class="code" href="buffer_8c.html#a1">dataBufPtr</a> == 0){
00127       <a class="code" href="storage_8h.html#a2">ReadDiskSector</a>(<a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o0">l</a>);
00128       <a class="code" href="buffer_8c.html#a1">dataBufPtr</a> = <a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o1">raw</a>.<a class="code" href="structDiskBlock_1_1Raw.html#o0">buf</a>;
00129     }
00130     <span class="keywordflow">while</span> (instream.l--){
00131       <a class="code" href="buffer_8c.html#a1">dataBufPtr</a>++;
00132     }    
00133   }<span class="comment">//nothing interesting,skip block</span>
00134 
00135   <span class="keywordflow">if</span> (isPadded){
00136     <a class="code" href="filesys_8c.html#a21">FGetChar</a>();
00137   }
00138       
00139 }
</div></pre>
<p>
Here is the call graph for this function:<p><center><img src="aviplay_8c_a5_cgraph.png" border="0" usemap="#aviplay_8c_a5_cgraph_map" alt=""></center>
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<a class="anchor" name="a6" doxytag="aviplay.c::PlayAvi" ></a><p>
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          <td class="md" nowrap valign="top"> unsigned char PlayAvi           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="mdname1" valign="top" nowrap>          </td>
          <td class="md" valign="top">&nbsp;)&nbsp;</td>
          <td class="md" nowrap></td>
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<p>
Try to play an avi file at current sector. 
<p>
Returns 0x11 if AVI header is not found, 0 if the file is played. 
<p>
Definition at line <a class="el" href="aviplay_8c-source.html#l00144">144</a> of file <a class="el" href="aviplay_8c-source.html">aviplay.c</a>.
<p>
References <a class="el" href="buffer_8h-source.html#l00107">DiskBlock::Raw::buf</a>, <a class="el" href="buffer_8c-source.html#l00013">dataBufPtr</a>, <a class="el" href="buffer_8c-source.html#l00010">diskSect</a>, <a class="el" href="filesys_8c-source.html#l00047">fileSize</a>, <a class="el" href="aviplay_8c-source.html#l00015">GetAVIBlock()</a>, <a class="el" href="buffer_8h-source.html#l00129">Address::l</a>, <a class="el" href="unionDiskBlock.html#o1">DiskBlock::raw</a>, <a class="el" href="storage_8c-source.html#l00110">ReadDiskSector()</a>, and <a class="el" href="buffer_8c-source.html#l00015">sectorAddress</a>.
<p>
Referenced by <a class="el" href="vs10xx_8c-source.html#l00202">PlayDiskSectors()</a>.
<p>
<pre class="fragment"><div>00144                        {
00145 
00146   <a class="code" href="storage_8h.html#a2">ReadDiskSector</a>(<a class="code" href="buffer_8c.html#a2">sectorAddress</a>.<a class="code" href="unionAddress.html#o0">l</a>);
00147 
00148   <span class="comment">//DumpDiskSector();</span>
00149 
00150   <span class="keywordflow">if</span> (<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o1">raw</a>.<a class="code" href="structDiskBlock_1_1Raw.html#o0">buf</a>[8]!=<span class="charliteral">'A'</span>) <span class="keywordflow">return</span> 0x11;
00151   <span class="keywordflow">if</span> (<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o1">raw</a>.<a class="code" href="structDiskBlock_1_1Raw.html#o0">buf</a>[9]!=<span class="charliteral">'V'</span>) <span class="keywordflow">return</span> 0x11;
00152   <span class="keywordflow">if</span> (<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o1">raw</a>.<a class="code" href="structDiskBlock_1_1Raw.html#o0">buf</a>[10]!=<span class="charliteral">'I'</span>) <span class="keywordflow">return</span> 0x11;
00153   ConsoleWrite(<span class="stringliteral">"\rPlayAvi()\r"</span>);
00154 
00155   <a class="code" href="buffer_8c.html#a1">dataBufPtr</a>=<a class="code" href="buffer_8c.html#a0">diskSect</a>.<a class="code" href="unionDiskBlock.html#o1">raw</a>.<a class="code" href="structDiskBlock_1_1Raw.html#o0">buf</a>+12;
00156 
00157   <span class="keywordflow">while</span>(<a class="code" href="filesys_8c.html#a7">fileSize</a>){
00158     <a class="code" href="aviplay_8c.html#a5">GetAVIBlock</a>();
00159   }
00160 
00161   <span class="keywordflow">return</span> 0;
00162 }
</div></pre>
<p>
Here is the call graph for this function:<p><center><img src="aviplay_8c_a6_cgraph.png" border="0" usemap="#aviplay_8c_a6_cgraph_map" alt=""></center>
<map name="aviplay_8c_a6_cgraph_map">
<area href="aviplay_8c.html#a5" shape="rect" coords="116,80,199,104" alt="">
<area href="storage_8h.html#a2" shape="rect" coords="445,104,546,128" alt="">
<area href="player_8c.html#a12" shape="rect" coords="247,6,396,30" alt="">
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<hr>
<FONT SIZE="-1">
All software copyright 2000-2004 <a href="http://www.vlsi.fi/"> VLSI Solution OY.</a>
Redistribution of these software modules are limited to promotional use only
and only with the VS1011 / VS1002 / VS1003  MP3-Evakit evaluation boards. Free or
commercial use of these software modules in MP3 players is ok if the
product includes MP3 decoder chip(s) from VLSI. You can request the complete
(compilable) package from [e-mail]
</FONT>