<div dir="ltr">The programing API for opus only uses 48khz signed linear audio. We add the codec to the system with that as the native rate and it translates for us.<div>I don't know what the cost is really. Its not really useful to use if you plan to bridge to the PSTN anyway but it will work fine in FS at probably some noticeable cpu usage.</div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Aug 5, 2013 at 9:59 AM, Tamas Jalsovszky <span dir="ltr"><<a href="mailto:jalsot@gmail.com" target="_blank">jalsot@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Is there any info how much bandwidth is required for 48kHz audio? How CPU hungry is downsampling to 8kHz G711?<br>
</div>According to <a href="http://opus-codec.org" target="_blank">opus-codec.org</a>, opus can use sampling rates from 8kHz, not just 48kHz. In cases when the call ends in PSTN, won't be appropriate to support 8kHz sampling rate in FS too?<br>
</div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Aug 1, 2013 at 9:18 PM, Anthony Minessale <span dir="ltr"><<a href="mailto:anthony.minessale@gmail.com" target="_blank">anthony.minessale@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir="ltr">Opus always uses 48khz </p>
<div class="gmail_quote"><div><div>On Aug 1, 2013 2:15 PM, "Dimosthenis Arkoudeas" <<a href="mailto:dimosthenis@arkoudeas.com" target="_blank">dimosthenis@arkoudeas.com</a>> wrote:<br type="attribution">
</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div>
<div link="#0563C1" vlink="#954F72" lang="EL">
<div>
<p class="MsoNormal"><span lang="EN-US">Hi all,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Playing with mod_opus came up with the following.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">I am trying to recompile the codec with 8Khz and 40ms ptime. I am not familiar with the codec internals and not really sure what parameters should I change…<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">In mod_opus.c :<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Line 59:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"" lang="EN-US">int bitrate_bps = codec->implementation->bits_per_second;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"" lang="EN-US"> int use_vbr = 1;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"" lang="EN-US"> int complexity = 10;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"" lang="EN-US"> int use_inbandfec = 1;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"" lang="EN-US"> int use_dtx = 1;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"" lang="EN-US"> int bandwidth = OPUS_BANDWIDTH_FULLBAND;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"" lang="EN-US"> </span><span style="font-size:10.0pt;font-family:"Courier New"">int err;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"" lang="EN-US">I suppose that the bandwidth must be changed to OPUS_BANDWIDTH_NARROWBAND and use_vbr=0 and I haven’t found yet whether the FEC parameter is passed
to opus encoder.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"" lang="EN-US">And in Line 184 , I think the following parameters must be changed<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"" lang="EN-US"><u></u> <u></u></span></p>
<pre><span lang="EN-US"> </span><span><span lang="EN-US">switch_codec_interface_t</span></span><span lang="EN-US"> *</span><span><span lang="EN-US">codec_interface</span></span><span lang="EN-US">;<u></u><u></u></span></pre>
<pre><span lang="EN-US"> <span>int</span> </span><span><span lang="EN-US">samples</span></span><span lang="EN-US"> = <span>480</span>;<u></u><u></u></span></pre>
<pre><span lang="EN-US"> <span>int</span> </span><span><span lang="EN-US">bytes</span></span><span lang="EN-US"> = <span>960</span>;<u></u><u></u></span></pre>
<pre><span lang="EN-US"> <span>int</span> </span><span><span lang="EN-US">mss</span></span><span lang="EN-US"> = <span>10000</span>;<u></u><u></u></span></pre>
<pre><span lang="EN-US"> <span>int</span> </span><span><span lang="EN-US">x</span></span><span lang="EN-US"> = <span>0</span>;<u></u><u></u></span></pre>
<pre><span lang="EN-US"> <span>int</span> </span><span><span lang="EN-US">rate</span></span><span lang="EN-US"> = <span>48000</span>;<u></u><u></u></span></pre>
<pre><span lang="EN-US"> <span>int</span> </span><span><span lang="EN-US">bits</span></span><span lang="EN-US"> = <span>32000</span>;<u></u><u></u></span></pre>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"" lang="EN-US">Can you propose any values about these parameters to achieve 8khz with 40ms packet time?
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"" lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks for any help,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Dimosthenis<u></u><u></u></span></p>
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