https://elinux.org/index.php?title=AudioThru_Lab&feed=atom&action=historyAudioThru Lab - Revision history2024-03-28T18:37:18ZRevision history for this page on the wikiMediaWiki 1.31.0https://elinux.org/index.php?title=AudioThru_Lab&diff=82718&oldid=prevYoder: No longer needed. Moved to ToDelete2012-01-02T14:49:28Z<p>No longer needed. Moved to ToDelete</p>
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<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del class="diffchange diffchange-inline">[[Category:Workshops]]</del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del class="diffchange diffchange-inline">[[Category:BeagleBoard</del>]]</div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>This is a lab exercise that is being offered at ICASSP 2011 in Prague.  In this lab you will inspect, compile and run code that uses the Linux [http://www.alsa-project.org/main/index.php/Main_Page ALSA] sound drivers to capture real-time audio, pass it to the C64x DSP for processing and then out to the speakers.</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>This is a lab exercise that is being offered at ICASSP 2011 in Prague.  In this lab you will inspect, compile and run code that uses the Linux [http://www.alsa-project.org/main/index.php/Main_Page ALSA] sound drivers to capture real-time audio, pass it to the C64x DSP for processing and then out to the speakers.</div></td></tr>
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</table>Yoderhttps://elinux.org/index.php?title=AudioThru_Lab&diff=63289&oldid=prevYoder: Removed analytics2011-08-18T17:26:45Z<p>Removed analytics</p>
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 17:26, 18 August 2011</td>
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<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"><analytics uacct="UA-119847-6" ></analytics></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>This is a lab exercise that is being offered at ICASSP 2011 in Prague.  In this lab you will inspect, compile and run code that uses the Linux [http://www.alsa-project.org/main/index.php/Main_Page ALSA] sound drivers to capture real-time audio, pass it to the C64x DSP for processing and then out to the speakers.</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>This is a lab exercise that is being offered at ICASSP 2011 in Prague.  In this lab you will inspect, compile and run code that uses the Linux [http://www.alsa-project.org/main/index.php/Main_Page ALSA] sound drivers to capture real-time audio, pass it to the C64x DSP for processing and then out to the speakers.</div></td></tr>
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</table>Yoderhttps://elinux.org/index.php?title=AudioThru_Lab&diff=62965&oldid=prevYoder: Added Analytics2011-08-17T15:36:17Z<p>Added Analytics</p>
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<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"><analytics uacct="UA-119847-6" ></analytics></ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>This is a lab exercise that is being offered at ICASSP 2011 in Prague.  In this lab you will inspect, compile and run code that uses the Linux [http://www.alsa-project.org/main/index.php/Main_Page ALSA] sound drivers to capture real-time audio, pass it to the C64x DSP for processing and then out to the speakers.</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>This is a lab exercise that is being offered at ICASSP 2011 in Prague.  In this lab you will inspect, compile and run code that uses the Linux [http://www.alsa-project.org/main/index.php/Main_Page ALSA] sound drivers to capture real-time audio, pass it to the C64x DSP for processing and then out to the speakers.</div></td></tr>
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</table>Yoderhttps://elinux.org/index.php?title=AudioThru_Lab&diff=48757&oldid=prevYoder: /* Experiment with the code */ Added ideas of things to try.2011-05-17T16:22:19Z<p><span dir="auto"><span class="autocomment">Experiment with the code: </span> Added ideas of things to try.</span></p>
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 16:22, 17 May 2011</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># git commit -m "Initial commit"</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div># git commit -m "Initial commit"</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></pre></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div></pre></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del class="diffchange diffchange-inline">Later if </del>you</div></td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">If needed </ins>you <ins class="diffchange diffchange-inline">can use git to retrieve the original version of the files.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">Things to try:</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">* There are places in the code where timing can be displayed.  Remove the comments and display the times.  How often is the main loop executed?  How long does the DSP take? What's the overhead for the DSP? </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">* Try making the DSP do more than pass through.  Zero out the left channel to be sure it is working.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">* Try changing the sampling rate and buffer sizes.  What setting cause the buffers to overflow or underflow?</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">* Implement your own processing on the DSP.  Do a simple FIR lowpass filter, etc.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">* Switch the input to the microphones on the web cam and listen to your voice.</ins></div></td></tr>
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</table>Yoderhttps://elinux.org/index.php?title=AudioThru_Lab&diff=48247&oldid=prevYoder: Added categories2011-05-17T01:24:25Z<p>Added categories</p>
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<td colspan="2" style="background-color: #fff; color: #222; text-align: center;">Revision as of 01:24, 17 May 2011</td>
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<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[Category:Workshops]]</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[Category:BeagleBoard]]</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>This is a lab exercise that is being offered at ICASSP 2011 in Prague.  In this lab you will inspect, compile and run code that uses the Linux [http://www.alsa-project.org/main/index.php/Main_Page ALSA] sound drivers to capture real-time audio, pass it to the C64x DSP for processing and then out to the speakers.</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>This is a lab exercise that is being offered at ICASSP 2011 in Prague.  In this lab you will inspect, compile and run code that uses the Linux [http://www.alsa-project.org/main/index.php/Main_Page ALSA] sound drivers to capture real-time audio, pass it to the C64x DSP for processing and then out to the speakers.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #222; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr>
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</table>Yoderhttps://elinux.org/index.php?title=AudioThru_Lab&diff=48085&oldid=prevYoder: Initial page2011-05-16T21:06:31Z<p>Initial page</p>
<p><b>New page</b></p><div>This is a lab exercise that is being offered at ICASSP 2011 in Prague. In this lab you will inspect, compile and run code that uses the Linux [http://www.alsa-project.org/main/index.php/Main_Page ALSA] sound drivers to capture real-time audio, pass it to the C64x DSP for processing and then out to the speakers.<br />
<br />
== Compiling the code ==<br />
Here are the steps to take:<br />
<br />
* Open a terminal window. '''Application:Accessories:Terminal'''<br />
* In the terminal:<br />
<pre><br />
# source /c6run_build/environment.sh<br />
# source /c6run_build/loadmodules.sh<br />
# cd AudioThru<br />
# ls<br />
</pre><br />
The first line sets up the environment so you can compile for the C64x. The second lines loads the kernel modules needed to talk to the DSP.<br />
<br />
The '''AudioThru''' directory contains labs I've used to teach the ALSA sound driver. <br />
# '''audio_record''' shows how to capture audio and store it in a file.<br />
# '''audio_playback''' takes audio from a file and plays it.<br />
# '''audio_loopthru''' has the students combine the first two labs to do real-time audio io.<br />
# '''audio_c6run''' builds on the loopthru lab by passing the live data to the DSP for processing.<br />
<br />
We only have time for one lab, so do the last one.<br />
<pre><br />
# cd lab06d_audio_c6run<br />
# ls<br />
</pre><br />
There are 3 groups of files here. The source code (*.c and *.h), object files for running on the ARM (gpp) only (audioThru_arm, gpp, gpp_lib) and objects files for running on the DSP (audioThru_dsp, dsp, dsp_lib). What's significant is that the same source code produced both sets of objects (dsp, gpp). It's how the source is compiled determines where it is run. <br />
<br />
== Running ==<br />
<br />
Run the apps.<br />
<pre><br />
# ./audioThru_arm<br />
# ./audioThru_dsp<br />
</pre><br />
Both will run until you hit '''ctrl-C'''. To hear something you need to hookup your mp3 player to the input on the Beagle and speakers to the output.<br />
<br />
Once you are sure it is working, try building everything from scratch.<br />
<pre><br />
# make clean<br />
# make<br />
</pre><br />
By default '''make''' creates both the ARM only and DSP objects. make takes about 20 seconds on my Beagle.<br />
<br />
== Experiment with the code ==<br />
<br />
Now that you have something working, play around a bit. git is installed so you can preserve the present contents of the files with:<br />
<pre><br />
# git add Makefile audio_input_output.c audio_process.c audio_thread.c<br />
# git commit -m "Initial commit"<br />
</pre><br />
Later if you</div>Yoder