IE11 does not unfortunately support Web Audio at all. If that is what you're seeing, then it is expected. If it's failing on some other reason than audio, then it may be a web api issue that IE doesn't have, in which case we may be able to find a IE11-specific workaround. Log output and a minimal testcase might help here.
Typically audio crackling comes from due to starvation when JS code executes for too long. To improve audio performance, the general best strategy is to use a browser profiler to find hotspots in the code and try to optimize those as much as possible. If you are seeing crackling while the JS workload is very low, then it might be something else. I'm not sure what you mean by UTF-8 output? 2014-12-29 17:39 GMT+02:00 Philip Bennefall <[email protected]>: > Hi there, > > When I remove the closure call, I actually get audio output! However, I > still see the huge UTF-8 string output and I get crackling audio fairly > frequently. The audio crackles more than usual if, for instance, I set > focus to the textarea. I have tried setting the samples in the spec > structure both to a high value like 4096, and to a lower one like 1024 with > roughly the same results. Is there a way to get low latency audio without > crackling, and is it possible to get rid of the UTF-8 output? > > Kind regards, > > Philip Bennefall > P.S. The script does not seem to work in IE. Is this a known limitation? > > On 12/29/2014 3:42 PM, Jukka Jylänki wrote: > > Does it occur with all compilation flags? If you remove -O2 and/or > --closure 1, does it still occur? How about if you add -g to the build? > > 2014-12-28 16:25 GMT+02:00 <[email protected]>: > >> Hi all, >> >> I am new to Emscripten, and am really impressed with it so far! The setup >> procedure on Windows was smooth, and hello world built just fine. I wanted >> to see if I could get audio working through SDL2,, so I downloaded the SDL2 >> port by way of the automatic setup command. Then, I ran the following from >> the Emscripten console: >> >> emcc loopwave.cpp -o loopwave.html -DNDEBUG --preload-file sample.wav -O2 >> -s USE_SDL=2 --closure 1 >> >> loopwave.cpp is basically loopwave.c from the SDL distribution, pulled >> from the repo so that I get the emscriptin loop etc. I only made one minor >> change; making it so that sample.wav is always used and no command line >> input is considered. The file can be found at: >> https://dl.dropboxusercontent.com/u/5121962/loopwave.cpp >> >> sample.wav is here: >> https://dl.dropboxusercontent.com/u/5121962/sample.wav >> >> The program compiled without errors, letting me know that it was using >> SDL2. I uploaded all the files to the server (the HTML, the .js, the .mem >> and the .data files), and tried running it in both Firefox and IE. In IE I >> saw nothing, but in Firefox I received what looks like UTF-8 strings and >> then a ton of exceptions. They are basically all the same, looking as >> follows: >> >> "[post-exception status] Exception thrown, see JavaScript console"12 >> loopwave.html:1245 >> ReferenceError: Runtime is not defined >> loopwave.js line 14 > eval:1 >> "[post-exception status] Exception thrown, see JavaScript console" >> loopwave.html:1245 >> ReferenceError: Runtime is not defined >> loopwave.js line 14 > eval:1 >> "[post-exception status] Exception thrown, see JavaScript console"2 >> loopwave.html:1245 >> ReferenceError: Runtime is not defined2 >> loopwave.js line 14 > eval:1 >> "[post-exception status] Exception thrown, see JavaScript console" >> loopwave.html:1245 >> ReferenceError: Runtime is not defined >> loopwave.js line 14 > eval:1 >> >> Etc. I have no idea what these errors mean, could anyone shed some light? >> >> Thanks in advance for any help! >> >> Kind regards, >> >> Philip Bennefall >> -- >> You received this message because you are subscribed to the Google Groups >> "emscripten-discuss" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/d/optout. >> > > -- > You received this message because you are subscribed to a topic in the > Google Groups "emscripten-discuss" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/emscripten-discuss/2IQ28VucwDQ/unsubscribe > . > To unsubscribe from this group and all its topics, send an email to > [email protected]. > For more options, visit https://groups.google.com/d/optout. > > > -- > You received this message because you are subscribed to the Google Groups > "emscripten-discuss" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
