Poor performance Sound

Hello world

I experience for a new application, a sort of dj app. However, it seems that the performance of the Sound and the SoundChannel class on the PlayBook is extremely poor.

I use the following code by André Michelle:

package components
{
    import flash.events.Event;
    import flash.events.SampleDataEvent;
    import flash.media.Sound;
    import flash.net.URLRequest;
    import flash.utils.ByteArray;

    /**
     * @author Andre Michelle ([email protected])
     */
    public class MP3Pitch
    {
        private const BLOCK_SIZE: int = 3072;

        private var _mp3: Sound;
        private var _sound: Sound;

        private var _target: ByteArray;

        private var _position: Number;
        private var _rate: Number;

        public function MP3Pitch( url: String )
        {
            _target = new ByteArray();

            _mp3 = new Sound();
            _mp3.addEventListener( Event.COMPLETE, complete );
            _mp3.load( new URLRequest( url ) );

            _position = 0.0;
            _rate = 1.0;

            _sound = new Sound();
            _sound.addEventListener( SampleDataEvent.SAMPLE_DATA, sampleData );
        }

        public function get rate(): Number
        {
            return _rate;
        }

        public function set rate( value: Number ): void
        {
            if( value < 0.0 )
                value = 0;

            _rate = value;
        }

        private function complete( event: Event ): void
        {
            _sound.play();
        }

        private function sampleData( event: SampleDataEvent ): void
        {
            //-- REUSE INSTEAD OF RECREATION
            _target.position = 0;

            //-- SHORTCUT
            var data: ByteArray = event.data;

            var scaledBlockSize: Number = BLOCK_SIZE * _rate;
            var positionInt: int = _position;
            var alpha: Number = _position - positionInt;

            var positionTargetNum: Number = alpha;
            var positionTargetInt: int = -1;

            //-- COMPUTE NUMBER OF SAMPLES NEED TO PROCESS BLOCK (+2 FOR INTERPOLATION)
            var need: int = Math.ceil( scaledBlockSize ) + 2;

            //-- EXTRACT SAMPLES
            var read: int = _mp3.extract( _target, need, positionInt );

            var n: int = read == need ? BLOCK_SIZE : read / _rate;

            var l0: Number;
            var r0: Number;
            var l1: Number;
            var r1: Number;

            for( var i: int = 0 ; i < n ; ++i )
            {
                //-- AVOID READING EQUAL SAMPLES, IF RATE < 1.0
                if( int( positionTargetNum ) != positionTargetInt )
                {
                    positionTargetInt = positionTargetNum;

                    //-- SET TARGET READ POSITION
                    _target.position = positionTargetInt << 3;

                    //-- READ TWO STEREO SAMPLES FOR LINEAR INTERPOLATION
                    l0 = _target.readFloat();
                    r0 = _target.readFloat();

                    l1 = _target.readFloat();
                    r1 = _target.readFloat();
                }

                //-- WRITE INTERPOLATED AMPLITUDES INTO STREAM
                data.writeFloat( l0 + alpha * ( l1 - l0 ) );
                data.writeFloat( r0 + alpha * ( r1 - r0 ) );

                //-- INCREASE TARGET POSITION
                positionTargetNum += _rate;

                //-- INCREASE FRACTION AND CLAMP BETWEEN 0 AND 1
                alpha += _rate;
                while( alpha >= 1.0 ) --alpha;
            }

            //-- FILL REST OF STREAM WITH ZEROs
            if( i < BLOCK_SIZE )
            {
                while( i < BLOCK_SIZE )
                {
                    data.writeFloat( 0.0 );
                    data.writeFloat( 0.0 );

                    ++i;
                }
            }

            //-- INCREASE SOUND POSITION
            _position += scaledBlockSize;
        }
    }
}

When I play a sound by using this method, it is extremely rough. However, this class is as simple as it can get, so I missed something? Or should I just give up on making this work on the PlayBook?

Best regards

I don't see anything explaining why the code is so complicated, instead of just letting the Sound object directly play the MP3 file. Why all the SampleData stuff?

Also, I've only skimmed it so far, but I see that block_size is hardcoded to 3072. Why that value? Have you tried others? Depending on how much other work the code, it may simply not be generating as many samples per update (i.e. for each SampleDataEvent.SAMPLE_DATA) you should try to do it, then it 'get '. Try at least 4096, or an even greater value if this is allowed... I vaguely remember 8192 is the maximum (although perhaps shared between the two channels).

How long the event runs itself? Try to add a measure of the time at the beginning and at the end of this routine to see if it takes much more time that you expect... and longer than the time available to it.

Tags: BlackBerry Developers

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My friend has an old laptop. She uses it to much except e-mail, navigation of base and Netflix. Even if its an old computer, it seems very slow for me. Here are the specs: Dell INSPIRON1100 Celeron CPU 2.20 GHz. 224 MB of RAM MS Windows XP Home Edition Version 2002 Service Pack 3. A C. NTFS drive. Total area is 27.7 Gb. = 14.8 GB free space. Other statistics: since the Manager task performance (after a start cold with no loaded application) monitor commit Charge Total 150360 limited 556276 pic 284296 network Local area connectivity 100 Mbps (Comcast in connection with cable to the router Comcast) to start cold (completely died), it takes apx. 2 minutes to start until I hear the Windows chime. Once the base system begins, launching applications is very slow. For example, right after you start with nothing else loading it takes apx. 22 seconds to start Firefox, then check out the homepage. This may be because of the speed of the Internet (which is good see above) because the home page is a very small local file on your hard drive. Its a file with no graphics at all, only four links (e-mail, google, page news and Netflix). After Firefox starts when I click Netflix it takes apx. 20 seconds for the home screen to come and be usable. (These times are however from a freshly toed machine) When I click on a movie it takes apx. 30 seconds just for me getting the red Netflix screen which indicates the film is start and apx. 1 minute for the movie to start. It's actually not too bad, but once the computer has been used for a while, it may take much longer. Its also very little reliable. It crashes a LOT and she in turn off the computer at least once every night or she will end up hanging. Sometimes, it crashes even when during the day and must be restarted. Even if we do not get the blue screen of death, we get just the hourglass and his does not. BTW, it uses Firefox, because when I loaded a few patches from Microsoft a year ago Internet Explorer has stopped working. It seemed as if some IE plugin hung looking for some data. I remember the details because it was some time ago and I just loaded Firefox which worked immediately. Its virus protection is out of date, however she sails almost never on the Internet. On the other hand it is not very computer savvy so its possible there is some virus. I've seen the ads for registry cleaners, but they sound like they might be potentially more trouble then help. I'm ready to install a virus protection, what would be the best recommendation for someone who has no eCommerce, ne * and very limited surfing? This could be a virus problem? Or maybe it's that the computer has low RAM and my expectations are unrealistic, because I work on most modern machines with more powerful processors and a lot more than RAM? One last thing, the fan seems to be almost constantly.

Of course, a lack of ram is definitely a problem. I would like to scan the computer for malware with Malwarebytes and SuperAntispyware. Remove any detected object. Defragment and see if there are improvements.

Also, great job to give information on the computer. The problems are much easier to solve with sufficient information.

EA6400 poor performance of 2.4 ghz

Hi guys

I just bought this linksys EA6400 (ac1600) the router and im having a lot of trouble with her

im getting the power of the signal very poor and poor networkspeed on speedtest.net because of this

Ive got 100/10 cable, but wireless 2.4 ghz (ive not yet 5 GHz of adapters) im only get 10mbits on speedtest and sometimes worst way only 5mbits and its only 4 meters (13 feet) away (2/5 bars signal strength on my devices)

im getting the same or better performance with my old router e1000

what I tried:

-The routers to the latest version firmware update

-updated drivers on PCs and laptops in my area

-tried other channels 2,4 ghz with no luck at all im getting worse performance on 1.6 and 11 if I leave it in the car, it is the best

-ive tried to disable the transfer of cutting hollow

-adjust the width of the channel to only 20 mhz

-n only wireless network mode

-factory reset

-priority implementation of media

all this he has not improved

My settings for the moment:

-all on the car to 2.4 ghz page

-no priority media

-rest of my settings are auto adjustment

What should I do? return the router for an asus router or something?

any help would be appreciated

5 GHz is no choice because my pc, the laptop and the phone does not support the 2.4 ghz I will modernize the PC and laptop adapters CA / CC 5 GHz

my phone should be ok, but I think my older e1000 router was acually better at 2.4 ghz

Thank you very much

Jochem

What Protocol (b/g/n) wireless devices are connecting to the EA6400 with?

In the connection status of the client devices window, which is listed as the connection speed (54 Mbps, 150mbps, etc.)?

The link below has some good information about the wireless channel width:

FAQ of SmallNetBuilder Wireless: the essential

This article does not take into account changes to the rule of co-existence 20 Mhz Wireless. Essentially if a 20 Mhz signal is detected by the router in the range of 2.4 Ghz router is to drop her at 20 Mhz channel width, which will reduce speeds in two.

The best solution is to upgrade the client machines to 5 GHz.

Other things to try:
1. Support WMM Enable\Disable (I recommend it be enabled if no improvement is noticed with this option disabled)
2. Activate Media prioritization with a parameter to 100000 Kbps downstream bandwidth and keep all devices\apps to normal priority to start
3. Only use WPA2 Personal wireless security
4. Set the Protocol Wireless 2.4 Ghz "N only.

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