<div dir="ltr">Thanks for your response (from weeks ago!).<div><br></div><div>You said real-time performance will hinge on the MULS instruction. I've just looked this up, and although the ARM Cortex-M0 has a configurable 1-cycle or 32-cycle MULS, the PSoC developers chose the faster one. Phew!</div><div><br></div><div>From the PSoC docs:</div><div><br></div><div><div>"32-bit Cortex-M0 CPU with single-cycle multiply delivering up to 43 DMIPS at 48 MHz"</div><div><br></div>Thanks for the other pointers, and I'll let you know my results in the coming weeks when I get back on this.</div><div><br><div class="gmail_quote"><div class="GmSign">-- <br><div dir="ltr"><div><div dir="ltr"><p>Brian Silverman<br></p><p>Ready Set STEM</p><p><a href="mailto:bri@readysetstem.com" target="_blank">bri@readysetstem.com</a></p><p>443-850-5351</p></div></div></div><br></div><div dir="ltr">On Thu, Mar 9, 2017 at 9:44 AM Jean-Marc Valin <<a href="mailto:jmvalin@jmvalin.ca">jmvalin@jmvalin.ca</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class="gmail_msg"><div class="gmail_msg">Seems like everyone but you got the answer. See the archive: <a href="http://lists.xiph.org/pipermail/opus/2017-February/003764.html" class="gmail_msg" target="_blank">http://lists.xiph.org/pipermail/opus/2017-February/003764.html</a><br class="gmail_msg"></div>You might want to check why your SMTP gateway rejected my original email.<br class="gmail_msg"></div><div class="gmail_extra gmail_msg"><br class="gmail_msg"><div class="gmail_quote gmail_msg"><div class="GmSign">-- <br><div dir="ltr"><div><div dir="ltr"><p>Brian Silverman<br></p><p>Ready Set STEM</p><p><a href="mailto:bri@readysetstem.com" target="_blank">bri@readysetstem.com</a></p><p>443-850-5351</p></div></div></div><br></div>On Thu, Mar 9, 2017 at 9:27 AM, Brian Silverman <span dir="ltr" class="gmail_msg"><<a href="mailto:bri@readysetstem.com" class="gmail_msg" target="_blank">bri@readysetstem.com</a>></span> wrote:<br class="gmail_msg"><blockquote class="gmail_quote gmail_msg" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class="gmail_msg"><span style="color:rgb(33,33,33);font-size:13px" class="gmail_msg">Hi,</span><div class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg" style="color:rgb(33,33,33);font-size:13px"><br class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg"></div><div class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg" style="color:rgb(33,33,33);font-size:13px">I'm looking a porting the<span class="m_8957079628793937655m_1903850595079268255inbox-inbox-Apple-converted-space gmail_msg"> </span><span class="m_8957079628793937655m_1903850595079268255inbox-inbox-lG gmail_msg" style="background-color:rgba(251,246,167,0.498039);outline:transparent dashed 1px">Opus</span><span class="m_8957079628793937655m_1903850595079268255inbox-inbox-Apple-converted-space gmail_msg"> </span>encoder (encoder only) to a Cypress PSoC 4 (a 32-bit ARM Cortex-M0 with very limited resources), and would like to know the feasibility of stripping down the encoder to fit. I've been playing with the encoder configured with "--enable-fixed-point --disable-intrinsics".</div><div class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg" style="color:rgb(33,33,33);font-size:13px"><br class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg"></div><div class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg" style="color:rgb(33,33,33);font-size:13px">The end result I'm trying to get to is encoding a single 16kHz 16-bit LPCM channel to fit into ~60kbps, and I'd like to encode in real-time or better. The opus_demo compression with default setting is fantastic on my test audio - more than 12x, where I only need about 4x. Hopefully that means I have plenty of room to tweak so I can fit it in my limited resources.</div><div class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg" style="color:rgb(33,33,33);font-size:13px"><br class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg"></div><div class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg" style="color:rgb(33,33,33);font-size:13px">My resources:</div><div class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg" style="color:rgb(33,33,33);font-size:13px"><ul class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg"><li class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg">48MHz 32-bit ARM Cortex-M0</li><li class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg">32k RAM (of which I probably on have 16-24k available)</li><li class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg">256k ROM (of which I probably only have 128-196k available)</li></ul><div class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg">I have no doubt that I can fit the design in ROM - I've already tried ripping out the decoder, and a stripped build can fit in 160k.</div></div><div class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg" style="color:rgb(33,33,33);font-size:13px"><br class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg"></div><div class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg" style="color:rgb(33,33,33);font-size:13px">But, on speed and RAM, any thoughts on the feasibility, or what I'd have to do to make this work? </div><div class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg" style="color:rgb(33,33,33);font-size:13px"><br class="m_8957079628793937655m_1903850595079268255gmail_msg gmail_msg"></div><div class="m_8957079628793937655m_1903850595079268255GmSign gmail_msg"><br class="gmail_msg"></div><div class="m_8957079628793937655m_1903850595079268255GmSign gmail_msg">P.S. I sent this to the mailing list before, but I never saw it appear. Sorry if this is a duplicate.</div><div class="m_8957079628793937655m_1903850595079268255GmSign gmail_msg"><br class="gmail_msg"></div><div class="m_8957079628793937655m_1903850595079268255GmSign gmail_msg">-- <br class="gmail_msg"><div dir="ltr" class="gmail_msg"><div dir="ltr" class="gmail_msg"><p class="gmail_msg">Brian Silverman<br class="gmail_msg"></p><p class="gmail_msg">Ready Set STEM</p><p class="gmail_msg"><a href="mailto:bri@readysetstem.com" class="gmail_msg" target="_blank">bri@readysetstem.com</a></p></div></div></div></div><span class="m_8957079628793937655HOEnZb gmail_msg"><font color="#888888" class="gmail_msg"><div dir="ltr" class="gmail_msg">-- <br class="gmail_msg"></div><div data-smartmail="gmail_signature" class="gmail_msg"><div dir="ltr" class="gmail_msg"><span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small" class="gmail_msg">--<span class="m_8957079628793937655m_1903850595079268255inbox-inbox-inbox-inbox-inbox-inbox-inbox-inbox-inbox-Apple-converted-space gmail_msg"> </span></span><br style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small" class="gmail_msg"><div class="m_8957079628793937655m_1903850595079268255gmail_signature gmail_msg" style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small"><div dir="ltr" class="gmail_msg"><div class="gmail_msg"><div dir="ltr" class="gmail_msg"><p class="gmail_msg">Brian Silverman<br class="gmail_msg"></p><p class="gmail_msg">Ready Set STEM</p><p class="gmail_msg"><a href="mailto:bri@readysetstem.com" style="color:rgb(17,85,204)" class="gmail_msg" target="_blank">bri@readysetstem.com</a></p><p class="gmail_msg"><a href="tel:(443)%20850-5351" value="+14438505351" class="gmail_msg" target="_blank">443-850-5351</a></p></div></div></div></div></div></div>
</font></span><br class="gmail_msg">_______________________________________________<br class="gmail_msg">
opus mailing list<br class="gmail_msg">
<a href="mailto:opus@xiph.org" class="gmail_msg" target="_blank">opus@xiph.org</a><br class="gmail_msg">
<a href="http://lists.xiph.org/mailman/listinfo/opus" rel="noreferrer" class="gmail_msg" target="_blank">http://lists.xiph.org/mailman/listinfo/opus</a><br class="gmail_msg">
<br class="gmail_msg"></blockquote></div><br class="gmail_msg"></div>
</blockquote></div></div></div><div dir="ltr">-- <br></div><div data-smartmail="gmail_signature"><div dir="ltr"><span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small">--<span class="inbox-inbox-inbox-inbox-inbox-inbox-inbox-inbox-inbox-Apple-converted-space"> </span></span><br style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small"><div class="gmail_signature" style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small"><div dir="ltr"><div><div dir="ltr"><p>Brian Silverman<br></p><p>Ready Set STEM</p><p><a href="mailto:bri@readysetstem.com" target="_blank" style="color:rgb(17,85,204)">bri@readysetstem.com</a></p><p>443-850-5351</p></div></div></div></div></div></div>