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<p>hello everyone,<br>
</p>
<p>for a raspberrry applicance I need to setup the input volume of
the microphone programaticaly</p>
<p>in c++, I can read the actual value (changed if I change it in
the pa mixer), but as I set it, it does not seem to work... <br>
</p>
<p>after I launched my code, I check in the pa panel mixer, the
volume is not changed</p>
<p>below, the sources with their chanels and volumes</p>
<pre style="" class="lang-cpp prettyprint prettyprinted"><code><span class="pln">SOURCE </span><span class="pun">:</span><span class="pln"> </span><span class="pun">[</span><span class="lit">0</span><span class="pun">]</span><span class="pln"> </span><span class="str">'alsa_output.usb-0d8c_C-Media_USB_Headphone_Set-00-Set.analog-stereo.monitor'</span><span class="pln"> </span><span class="str">'Monitor of Audio Adapter Analog Stereo'</span><span class="pln">
</span><span class="pun">(</span><span class="lit">0</span><span class="pun">)=</span><span class="pln"> </span><span class="lit">65536</span><span class="pln">
</span><span class="pun">(</span><span class="lit">1</span><span class="pun">)=</span><span class="pln"> </span><span class="lit">65536</span><span class="pln">
SOURCE </span><span class="pun">:</span><span class="pln"> </span><span class="pun">[</span><span class="lit">1</span><span class="pun">]</span><span class="pln"> </span><span class="str">'alsa_input.usb-0d8c_C-Media_USB_Headphone_Set-00-Set.analog-mono'</span><span class="pln"> </span><span class="str">'Audio Adapter Analog Mono'</span><span class="pln">
</span><span class="pun">(</span><span class="lit">0</span><span class="pun">)=</span><span class="pln"> </span><span class="lit">26281</span><span class="pln">
SOURCE </span><span class="pun">:</span><span class="pln"> </span><span class="pun">[</span><span class="lit">2</span><span class="pun">]</span><span class="pln"> </span><span class="str">'alsa_output.0.analog-stereo.monitor'</span><span class="pln"> </span><span class="str">'Monitor of bcm2835 ALSA Analog Stereo'</span><span class="pln">
</span><span class="pun">(</span><span class="lit">0</span><span class="pun">)=</span><span class="pln"> </span><span class="lit">65536</span><span class="pln">
</span><span class="pun">(</span><span class="lit">1</span><span class="pun">)=</span><span class="pln"> </span><span class="lit">65536</span></code></pre>
<p>so I try to change volume of source index #1</p>
<pre style="" class="lang-cpp prettyprint prettyprinted"><code><span class="kwd">void</span><span class="pln"> setVolume</span><span class="pun">(</span><span class="typ">int</span><span class="pln"> index</span><span class="pun">,</span><span class="typ">int</span><span class="pln"> volume</span><span class="pun">)</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
pa_operation</span><span class="pun">*</span><span class="pln"> o</span><span class="pun">;</span><span class="pln">
currentVolume</span><span class="pun">.</span><span class="pln">values</span><span class="pun">[</span><span class="lit">0</span><span class="pun">]=</span><span class="pln">volume</span><span class="pun">;</span><span class="pln">
</span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(!(</span><span class="pln">o </span><span class="pun">=</span><span class="pln"> pa_context_set_source_output_volume</span><span class="pun">(</span><span class="pln">context</span><span class="pun">,</span><span class="pln"> index</span><span class="pun">,</span><span class="pln"> </span><span class="pun">&</span><span class="pln">currentVolume</span><span class="pun">,</span><span class="pln"> NULL</span><span class="pun">,</span><span class="pln"> NULL</span><span class="pun">)))</span><span class="pln">
</span><span class="pun">{</span><span class="pln">
printf</span><span class="pun">(</span><span class="str">"pa_context_set_source_output_volume() failed"</span><span class="pun">);</span><span class="pln">
</span><span class="kwd">return</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
printf</span><span class="pun">(</span><span class="str">"new volume: %d\n"</span><span class="pun">,</span><span class="pln">currentVolume</span><span class="pun">.</span><span class="pln">values</span><span class="pun">[</span><span class="lit">0</span><span class="pun">]);</span><span class="pln">
pa_operation_unref</span><span class="pun">(</span><span class="pln">o</span><span class="pun">);</span><span class="pln">
</span><span class="pun">}</span></code></pre>
<p>please can someone help ?</p>
<p>thanks</p>
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