AEC tests. Part 2.

Thursday, March 25th, 2010

We’ve spent some time testing Speex AEC wrapped in SWC through Alchemy and finally have few points about that:

  • Speex AEC is working well, but in Flash it’s hard to use it, because of async nature of all SampleDataEvent calls. Although in few tests we saw it working, in real life it won’t work because of big latency and variable time between SampleDataEvent calls.
  • New flash player 10/10.1 audio features - playing audio samples and accessing audio samples from microphone will work only for non-realtime applications
  • Now it’s impossible to get audio data from RTMP audio stream and put it back to RTMP audio stream after it’s changed (applying AEC filters)

So even having access to samples on AS level it’s impossible to implement client-side AEC for Flash now. There are 2 options: wait until Adobe adds AEC to flash player itself (best solution, but unknown feature release date: Jobs is right about Adobe, they are lazy), implement server-side AEC (very complicated solution, won’t work for new flash P2P capabilities).

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First successful tests of AEC. Stay tuned.

Monday, March 8th, 2010

Adobe has informed that they are working on AEC support in Flash Player and it will be available later in the next release after 10.1, but we don’t want to wait another few years. In FP 10.1 we got access to microphone samples and playback samples and it makes possible to use some AEC. Although there are a lot of problems (only 44KHz playback mode) and async events firing our first tests showed that it actually works, but still have to solve some minor problems and adjust AEC for better quality. Prepare to have up to 40-50% of CPU load when AEC is working, but for most people AEC is worth it.

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Adobe confirms they are working on AEC

Sunday, February 21st, 2010

As you maybe know, there is still no Acoustic Echo Cancellation in Flash Player, it’s the problem for communication services if users aren’t equipped with a headsets. Finally, Adobe commented this issue and promised to add AEC to the next release of Flash Player, after 10.1.

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