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光驱cdrom读写源代码,scsi命令解析

<a class="l" name="221">    221 </a>			<a href="/source/s?defs=blocks_to_read">blocks_to_read</a> = <a href="/source/s?defs=read_burst_size">read_burst_size</a>;
<a class="l" name="222">    222 </a>
<a class="l" name="223">    223 </a>		<b>if</b> (<a href="/source/s?defs=dev">dev</a>-&gt;<a href="/source/s?defs=d_read_audio">d_read_audio</a>(<a href="/source/s?defs=dev">dev</a>, <a href="/source/s?defs=c_blk">c_blk</a> - <a href="/source/s?defs=blks_to_overlap">blks_to_overlap</a>,
<a class="l" name="224">    224 </a>		    <a href="/source/s?defs=blocks_to_read">blocks_to_read</a>, <a href="/source/s?defs=buf">buf</a>) == <span class="n">0</span>)
<a class="l" name="225">    225 </a>			<b>goto</b> <a href="/source/s?defs=read_audio_track_done">read_audio_track_done</a>;
<a class="l" name="226">    226 </a>
<a class="l" name="227">    227 </a>		<span class="c">/*
<a class="l" name="228">    228 </a>		 * This drive supports accurate audio extraction don't
<a class="l" name="229">    229 </a>		 * do jitter correction.
<a class="hl" name="230">    230 </a>		 */</span>
<a class="l" name="231">    231 </a>		<b>if</b> ((<a href="/source/s?defs=c_blk">c_blk</a> == <a href="/source/s?defs=start_blk">start_blk</a>) ||
<a class="l" name="232">    232 </a>		    (<a href="/source/s?defs=dev">dev</a>-&gt;<a href="/source/s?defs=d_cap">d_cap</a> &amp; <a href="/source/s?defs=DEV_CAP_ACCURATE_CDDA">DEV_CAP_ACCURATE_CDDA</a>)) {
<a class="l" name="233">    233 </a>			<a href="/source/s?defs=blocks_to_write">blocks_to_write</a> = <a href="/source/s?defs=blocks_to_read">blocks_to_read</a>;
<a class="l" name="234">    234 </a>			<a href="/source/s?defs=previous_end">previous_end</a> = <a href="/source/s?defs=buf">buf</a> + (<a href="/source/s?defs=blocks_to_write">blocks_to_write</a> * <a href="/source/s?defs=BLOCK_SIZE">BLOCK_SIZE</a>);
<a class="l" name="235">    235 </a>			<b>goto</b> <a href="/source/s?defs=skip_jitter_correction">skip_jitter_correction</a>;
<a class="l" name="236">    236 </a>		}
<a class="l" name="237">    237 </a>
<a class="l" name="238">    238 </a>		<b>if</b> (<a href="/source/s?defs=c_blk">c_blk</a> == <a href="/source/s?defs=start_blk">start_blk</a>)
<a class="l" name="239">    239 </a>			<a href="/source/s?defs=blks_to_overlap">blks_to_overlap</a> = <span class="n">0</span>;
<a class="hl" name="240">    240 </a>		<b>else</b>
<a class="l" name="241">    241 </a>			<a href="/source/s?defs=blks_to_overlap">blks_to_overlap</a> = <a href="/source/s?defs=READ_OVERLAP">READ_OVERLAP</a>;
<a class="l" name="242">    242 </a>		<a href="/source/s?defs=off">off</a> = <a href="/source/s?defs=handle_jitter">handle_jitter</a>(<a href="/source/s?defs=buf">buf</a>, <a href="/source/s?defs=previous_end">previous_end</a>);
<a class="l" name="243">    243 </a>		<b>if</b> (<a href="/source/s?defs=off">off</a> == -<span class="n">1</span>) {
<a class="l" name="244">    244 </a>			<b>if</b> (<a href="/source/s?defs=debug">debug</a>)
<a class="l" name="245">    245 </a>				(<b>void</b>) <a href="/source/s?defs=printf">printf</a>(
<a class="l" name="246">    246 </a>				    <span class="s">"jitter control failed\n"</span>);
<a class="l" name="247">    247 </a>
<a class="l" name="248">    248 </a>			<span class="c">/* recover if jitter correction failed */</span>
<a class="l" name="249">    249 </a>			<a href="/source/s?defs=off">off</a> = <a href="/source/s?defs=BLOCK_SIZE">BLOCK_SIZE</a> * <a href="/source/s?defs=BLOCKS_COMPARE">BLOCKS_COMPARE</a>;
<a class="hl" name="250">    250 </a>		}
<a class="l" name="251">    251 </a>
<a class="l" name="252">    252 </a>		<a href="/source/s?defs=blocks_to_write">blocks_to_write</a> = <a href="/source/s?defs=blocks_to_read">blocks_to_read</a> - <a href="/source/s?defs=blks_to_overlap">blks_to_overlap</a>;
<a class="l" name="253">    253 </a>
<a class="l" name="254">    254 </a>		<b>while</b> ((<a href="/source/s?defs=off">off</a> + (<a href="/source/s?defs=blocks_to_write">blocks_to_write</a>*<a href="/source/s?defs=BLOCK_SIZE">BLOCK_SIZE</a>)) &gt;
<a class="l" name="255">    255 </a>		    (<a href="/source/s?defs=blocks_to_read">blocks_to_read</a> * <a href="/source/s?defs=BLOCK_SIZE">BLOCK_SIZE</a>)) {
<a class="l" name="256">    256 </a>			<a href="/source/s?defs=blocks_to_write">blocks_to_write</a>--;
<a class="l" name="257">    257 </a>		}
<a class="l" name="258">    258 </a>
<a class="l" name="259">    259 </a>		<b>if</b> ((<a href="/source/s?defs=blocks_to_write">blocks_to_write</a> + <a href="/source/s?defs=c_blk">c_blk</a>) &gt; <a href="/source/s?defs=end_blk">end_blk</a>) {
<a class="hl" name="260">    260 </a>			<a href="/source/s?defs=blocks_to_write">blocks_to_write</a> = <a href="/source/s?defs=end_blk">end_blk</a> - <a href="/source/s?defs=c_blk">c_blk</a>;
<a class="l" name="261">    261 </a>		}
<a class="l" name="262">    262 </a>
<a class="l" name="263">    263 </a>		<b>if</b> (<a href="/source/s?defs=blocks_to_write">blocks_to_write</a> == <span class="n">0</span>) {
<a class="l" name="264">    264 </a>			<a href="/source/s?defs=c_blk">c_blk</a> = <a href="/source/s?defs=end_blk">end_blk</a> - <span class="n">1</span>;
<a class="l" name="265">    265 </a>			<a href="/source/s?defs=blocks_to_write">blocks_to_write</a> = <span class="n">1</span>;
<a class="l" name="266">    266 </a>			(<b>void</b>) <a href="/source/s?defs=memset">memset</a>(&amp;<a href="/source/s?defs=buf">buf</a>[<a href="/source/s?defs=off">off</a>], <span class="n">0</span>, <a href="/source/s?defs=off">off</a> % <a href="/source/s?defs=BLOCK_SIZE">BLOCK_SIZE</a>);
<a class="l" name="267">    267 </a>		}
<a class="l" name="268">    268 </a>
<a class="l" name="269">    269 </a>		<a href="/source/s?defs=previous_end">previous_end</a> = <a href="/source/s?defs=buf">buf</a> + <a href="/source/s?defs=off">off</a> + <a href="/source/s?defs=blocks_to_write">blocks_to_write</a> * <a href="/source/s?defs=BLOCK_SIZE">BLOCK_SIZE</a>;
<a class="hl" name="270">    270 </a><a href="/source/s?defs=skip_jitter_correction">skip_jitter_correction</a>:
<a class="l" name="271">    271 </a>		(<b>void</b>) <a href="/source/s?defs=memcpy">memcpy</a>(<a href="/source/s?defs=prev">prev</a>, <a href="/source/s?defs=buf">buf</a>, <a href="/source/s?defs=read_burst_size">read_burst_size</a> * <a href="/source/s?defs=BLOCK_SIZE">BLOCK_SIZE</a>);
<a class="l" name="272">    272 </a>		<b>if</b> (h-&gt;<a href="/source/s?defs=bstr_write">bstr_write</a>(h, &amp;<a href="/source/s?defs=buf">buf</a>[<a href="/source/s?defs=off">off</a>], <a href="/source/s?defs=blocks_to_write">blocks_to_write</a>*<a href="/source/s?defs=BLOCK_SIZE">BLOCK_SIZE</a>)
<a class="l" name="273">    273 </a>		    &lt; <span class="n">0</span>)
<a class="l" name="274">    274 </a>			<b>goto</b> <a href="/source/s?defs=read_audio_track_done">read_audio_track_done</a>;
<a class="l" name="275">    275 </a>		<a href="/source/s?defs=tmp">tmp</a> = <a href="/source/s?defs=buf">buf</a>;
<a class="l" name="276">    276 </a>		<a href="/source/s?defs=buf">buf</a> = <a href="/source/s?defs=prev">prev</a>;
<a class="l" name="277">    277 </a>		<a href="/source/s?defs=prev">prev</a> = <a href="/source/s?defs=tmp">tmp</a>;
<a class="l" name="278">    278 </a>
<a class="l" name="279">    279 </a>		<b>if</b> (<a href="/source/s?defs=abort_read">abort_read</a> == <span class="n">1</span>)
<a class="hl" name="280">    280 </a>			<b>goto</b> <a href="/source/s?defs=read_audio_track_done">read_audio_track_done</a>;
<a class="l" name="281">    281 </a>	}
<a class="l" name="282">    282 </a>
<a class="l" name="283">    283 </a>	<a href="/source/s?defs=ret">ret</a> = <span class="n">1</span>;
<a class="l" name="284">    284 </a>	(<b>void</b>) <a href="/source/s?defs=str_print">str_print</a>(<a href="/source/s?defs=gettext">gettext</a>(<span class="s">"done.\n"</span>), <a href="/source/s?defs=progress_pos">progress_pos</a>);
<a class="l" name="285">    285 </a>
<a class="l" name="286">    286 </a><a href="/source/s?defs=read_audio_track_done">read_audio_track_done</a>:
<a class="l" name="287">    287 </a>	(<b>void</b>) <a href="/source/s?defs=sigaction">sigaction</a>(<a href="/source/s?defs=SIGINT">SIGINT</a>, &amp;<a href="/source/s?defs=oldsv">oldsv</a>, (<b>struct</b> <a href="/source/s?defs=sigaction">sigaction</a> *)<span class="n">0</span>);
<a class="l" name="288">    288 </a>
<a class="l" name="289">    289 </a>	<a href="/source/s?defs=free">free</a>(<a href="/source/s?defs=buf">buf</a>);
<a class="hl" name="290">    290 </a>	<a href="/source/s?defs=free">free</a>(<a href="/source/s?defs=prev">prev</a>);
<a class="l" name="291">    291 </a>	<b>return</b> (<a href="/source/s?defs=ret">ret</a>);
<a class="l" name="292">    292 </a>}
<a class="l" name="293">    293 </a>
<a class="l" name="294">    294 </a><b>void</b>
<a class="l" name="295">    295 </a><a href="/source/s?defs=extract_audio">extract_audio</a>(<b>void</b>)
<a class="l" name="296">    296 </a>{
<a class="l" name="297">    297 </a>	<a href="/source/s?defs=bstreamhandle">bstreamhandle</a> h;
<a class="l" name="298">    298 </a>	<b>struct</b> <a href="/source/s?defs=track_info">track_info</a> *<a href="/source/s?defs=ti">ti</a>;
<a class="l" name="299">    299 </a>
<a class="hl" name="300">    300 </a>	(<b>void</b>) <a href="/source/s?defs=check_device">check_device</a>(<a href="/source/s?defs=target">target</a>, <a href="/source/s?defs=CHECK_NO_MEDIA">CHECK_NO_MEDIA</a> | <a href="/source/s?defs=CHECK_DEVICE_NOT_READY">CHECK_DEVICE_NOT_READY</a> |
<a class="l" name="301">    301 </a>	    <a href="/source/s?defs=EXIT_IF_CHECK_FAILED">EXIT_IF_CHECK_FAILED</a>);
<a class="l" name="302">    302 </a>
<a class="l" name="303">    303 </a>	<a href="/source/s?defs=ti">ti</a> = (<b>struct</b> <a href="/source/s?defs=track_info">track_info</a> *)<a href="/source/s?defs=my_zalloc">my_zalloc</a>(<b>sizeof</b> (*<a href="/source/s?defs=ti">ti</a>));
<a class="l" name="304">    304 </a>	<b>if</b> (!<a href="/source/s?defs=build_track_info">build_track_info</a>(<a href="/source/s?defs=target">target</a>, <a href="/source/s?defs=extract_track_no">extract_track_no</a>, <a href="/source/s?defs=ti">ti</a>)) {
<a class="l" name="305">    305 </a>		<a href="/source/s?defs=err_msg">err_msg</a>(<a href="/source/s?defs=gettext">gettext</a>(<span class="s">"Cannot get track information for track %d\n"</span>),
<a class="l" name="306">    306 </a>		    <a href="/source/s?defs=extract_track_no">extract_track_no</a>);
<a class="l" name="307">    307 </a>		<a href="/source/s?defs=exit">exit</a>(<span class="n">1</span>);
<a class="l" name="308">    308 </a>	}
<a class="l" name="309">    309 </a>
<a class="hl" name="310">    310 </a>	<span class="c">/* Verify track */</span>
<a class="l" name="311">    311 </a>	<b>if</b> ((<a href="/source/s?defs=ti">ti</a>-&gt;<a href="/source/s?defs=ti_track_size">ti_track_size</a> == <span class="n">0</span>) || ((<a href="/source/s?defs=ti">ti</a>-&gt;<a href="/source/s?defs=ti_flags">ti_flags</a> &amp; <a href="/source/s?defs=TI_NWA_VALID">TI_NWA_VALID</a>) &amp;&amp;
<a class="l" name="312">    312 </a>	    (<a href="/source/s?defs=ti">ti</a>-&gt;<a href="/source/s?defs=ti_start_address">ti_start_address</a> == <a href="/source/s?defs=ti">ti</a>-&gt;<a href="/source/s?defs=ti_nwa">ti_nwa</a>))) {
<a class="l" name="313">    313 </a>		<a href="/source/s?defs=err_msg">err_msg</a>(<a href="/source/s?defs=gettext">gettext</a>(<span class="s">"Track %d is empty\n"</span>), <a href="/source/s?defs=extract_track_no">extract_track_no</a>);
<a class="l" name="314">    314 </a>		<a href="/source/s?defs=exit">exit</a>(<span class="n">1</span>);
<a class="l" name="315">    315 </a>	}
<a class="l" name="316">    316 </a>	<b>if</b> (<a href="/source/s?defs=ti">ti</a>-&gt;<a href="/source/s?defs=ti_track_mode">ti_track_mode</a> &amp; <span class="n">4</span>) {
<a class="l" name="317">    317 </a>		<a href="/source/s?defs=err_msg">err_msg</a>(<a href="/source/s?defs=gettext">gettext</a>(<span class="s">"Track %d is not an audio track\n"</span>),
<a class="l" name="318">    318 </a>		    <a href="/source/s?defs=extract_track_no">extract_track_no</a>);
<a class="l" name="319">    319 </a>		<a href="/source/s?defs=exit">exit</a>(<span class="n">1</span>);
<a class="hl" name="320">    320 </a>	}
<a class="l" name="321">    321 </a>	<b>if</b> (<a href="/source/s?defs=ti">ti</a>-&gt;<a href="/source/s?defs=ti_data_mode">ti_data_mode</a> == <span class="n">2</span>) {
<a class="l" name="322">    322 </a>		<a href="/source/s?defs=err_msg">err_msg</a>(<a href="/source/s?defs=gettext">gettext</a>(<span class="s">"Track format is not supported\n"</span>));
<a class="l" name="323">    323 </a>		<a href="/source/s?defs=exit">exit</a>(<span class="n">1</span>);
<a class="l" name="324">    324 </a>	}
<a class="l" name="325">    325 </a>
<a class="l" name="326">    326 </a>	h = <a href="/source/s?defs=open_audio_for_extraction">open_audio_for_extraction</a>(<a href="/source/s?defs=extract_file">extract_file</a>);
<a class="l" name="327">    327 </a>	<b>if</b> (h == <a href="/source/s?defs=NULL">NULL</a>) {
<a class="l" name="328">    328 </a>		<a href="/source/s?defs=err_msg">err_msg</a>(<a href="/source/s?defs=gettext">gettext</a>(<span class="s">"Cannot open %s:%s\n"</span>), <a href="/source/s?defs=extract_file">extract_file</a>,
<a class="l" name="329">    329 </a>		    <a href="/source/s?defs=get_err_str">get_err_str</a>());
<a class="hl" name="330">    330 </a>		<a href="/source/s?defs=exit">exit</a>(<span class="n">1</span>);
<a class="l" name="331">    331 </a>	}
<a class="l" name="332">    332 </a>	<b>if</b> (<a href="/source/s?defs=read_audio_track">read_audio_track</a>(<a href="/source/s?defs=target">target</a>, <a href="/source/s?defs=ti">ti</a>, h) == <span class="n">0</span>) {
<a class="l" name="333">    333 </a>		<a href="/source/s?defs=err_msg">err_msg</a>(<a href="/source/s?defs=gettext">gettext</a>(<span class="s">"Extract audio failed\n"</span>));
<a class="l" name="334">    334 </a>		h-&gt;<a href="/source/s?defs=bstr_close">bstr_close</a>(h);
<a class="l" name="335">    335 </a>		<a href="/source/s?defs=exit">exit</a>(<span class="n">1</span>);
<a class="l" name="336">    336 </a>	}
<a class="l" name="337">    337 </a>	<b>if</b> (h-&gt;<a href="/source/s?defs=bstr_close">bstr_close</a>(h) != <span class="n">0</span>) {
<a class="l" name="338">    338 </a>		<a href="/source/s?defs=err_msg">err_msg</a>(<a href="/source/s?defs=gettext">gettext</a>(<span class="s">"Error closing audio stream : %s\n"</span>),
<a class="l" name="339">    339 </a>		    <a href="/source/s?defs=get_err_str">get_err_str</a>());
<a class="hl" name="340">    340 </a>		<a href="/source/s?defs=exit">exit</a>(<span class="n">1</span>);
<a class="l" name="341">    341 </a>	}
<a class="l" name="342">    342 </a>	<a href="/source/s?defs=exit">exit</a>(<span class="n">0</span>);
<a class="l" name="343">    343 </a>}
<a class="l" name="344">    344 </a></pre></div>
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