spice-html5 and raw PCM playback

lgcortinas <lgcortinas@xxxxxxxxxxxx> · Tue, 12 May 2015 12:00:57 +0200



    Hello,

    
    I'm running Debian 7.7 guest on Ubuntu 14.04 with QEMU 2.0.0
    downloaded from the Ubuntu repositories.

    With spicec client everything runs fine, but when using the
    spice-html5 client the sound doesn't work. I have 

    noticed that the server is sending the audio in raw PCM format and
    the html client complains about it. So I 

    tried to set the "playback-compression" option to "on" (should be
    "on" by default), but it didn't work.

    
    Now I'm trying to tweak the _javascript_ code for being able to play
    PCM audio, so I started to write some trial

    code, however, I'm stuck with the addSourceBuffer method, it doesn't
    seem to recognize other MIME type

    different than the original 'audio/webm; codecs="opus"' (I tried
    with Chrome and Firefox).

    from playback.js:

      (...)

        function handle_source_open(e)

        {

            var p = this.spiceconn;

        
            if (p.source_buffer)

                return;

        
            p.source_buffer =
        this.addSourceBuffer(SPICE_PLAYBACK_CODEC);  // I can't use
        other different than

                                                                       
                                                         // 'audio/webm; codecs="opus"'

            if (! p.source_buffer)

        (...)

      
    Maybe I missing something or it's impossible to make PCM audio work
    on MediaSource API.

    
    Modify the server would be hard at this moment, but if there's no
    other option, which version(s) should I use 

    to force the server to use opus?

    
    I
    
    really
      appreciate any help you can provide.

    
    Lorenzo.

    
    -- 

      
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