I'm using the AS3WavSound (http://code.google.com/p/as3wavsound/) class to playback externally loaded wavs. This is working successfully. The library is simple and effective.
After decoding the Wav ByteArray the method the library employs for playback is using the SampleDataEvent.SAMPLE_DATA event and then writing the mixed samples to the output stream.
player.addEventListener(SampleDataEvent.SAMPLE_DATA, onSamplesCallback);
private function onSamplesCallback( evt : SampleDataEvent ):void
{
for (var i:int = 0; i < samplesLength; i++)
{
if(_mute == false){
outputStream.writeFloat(samplesLeft[i]);
outputStream.writeFloat(samplesRight[i]);
}
}
}
My problem is that I need to silence this audio output immediately but whatever method I have tried there is a distinct (1 second approx) delay before the silence takes effect.
As you can see I've attempted to add a boolean to block any samples being written to the output stream but this has had no effect on the delay.
My suspicion is that this is a fundamental part of how the samples are buffered and then written out. Essentially by the time a user action on screen (clicking a mute button) has been called and the _mute boolean is set to true there are already samples waiting to be written to the output that cannot be affected.
Any advice or confirmation of my suspicion would be greatly appreciated.
Thanks,
gfte.
Your suspicion is probably right - but why stop it at that level? If you want to turn off the sound, would it not be better to set the volume on the soundTransform-property on the SoundChannel-object returned by the play method? (I assume the wav library returns this in some way)
It looks like the library you are using has a similar design to the native Flash Sound API wherein a SoundChannel object is returned from the play() method. This SoundChannel instance has a stop() method which should stop the sound right away.
var sound:WavSoundPlayer = new WavSoundPlayer();
var channel:WavSoundChannel = new WavSoundChannel();
sound.addEventListener( SampleDataEvent.SAMPLE_DATA, onSampleData );
channel = sound.play();
private function onSamplesData( evt : SampleDataEvent ):void
{
for (var i:int = 0; i < samplesLength; i++)
{
outputStream.writeFloat(samplesLeft[i]);
outputStream.writeFloat(samplesRight[i]);
}
}
channel.stop()
The _mute variable in your example will only be able to change either before or after the loop, not while it is looping.
Related
I am writing a JSFL script to export a set of png files for each major section of a flash animation. In order to do this, I need access to functions and variables in the Flash file's Main.as class. The documentation for JSFL is very sparse on the net, and I can't tell if this is possible. Here is what I have:
var docs = fl.documents;
for(var i = 0; i < docs.length; i++)
{
//loop through everything and turn off compression for max quality
var libItems = docs[i].library.items;
for (j = 0; j < libItems.length; j++){
if(libItems[j].itemType == "bitmap"){
libItems[j].allowSmoothing = true;
libItems[j].compressionType = "lossless";
}
}
//the variable adStages is an array of functions in the as3 class
//this way of trying to access the array doesn't work
for(k = 0; k<docs[i].adStages.length; k++){
//here I need to run function adStages[k] to move the animation on
//to the next frame to capture
docs[i].exportPNG("file:///Users/Graeme/Desktop/"+ docs[i].name + k,true, true);
}
}
I know I can do this a more clunky way by extending the Main.as file and using as3corelib PNGEncoder to export the files but I feel if this way works it could be more elegant and I don't have to be prompted on where to put the files each frame.
You can embed swf file into custom Flash IDE panel and then communicate through external interface or call JSFL code directly from AS3 via MMExecute() method. If plant to do lots of work with JSFL then consider reading Keith Peter's book Extending FlashMX 2004. this book is old but still very good and not outdated.
There are few answers which mix two audio tracks with sampleDataEvent listener while playing the entire sound. Is there any way to mix the tracks as fast as possible? (The tracks are of equal duration and is in the form of ByteArray)
In the post below
Programatically Mixdown of audio tracks (no playback)
the author suggests using Event.EnterFrame. However, I'm not quite familar with AS3's API. Can anyone give some example code? Thanks!
If you don't need to output the mix in binary format, just do double play.
track1.play();
track2.play();
Yep, as your tracks are in ByteArrays, first make two Sound object and get the data from bytearrays by loadPCMDataFromByteArray().
UPDATE: Since you don't want playback at all, the most simple way to mix the two tracks will be reading one float out of each ByteArray, then write their average into the resultant ByteArray. Using the ENTER_FRAME listener is worth it if you don't want to have your SWF stall while doing the conversion. You've said your arrays are of equal length, if so, the following code snippet should do your "simple mix" of those wavs:
var f1:Number;
var f2:Number;
b1.position=0;
b2.position=0;
var result:ByteArray=new ByteArray();
var l:int=b1.length; // cache property
var i:int=0;
while (i<l) {
i=i+4; // size of float
f1=b1.readFloat();
f2=b2.readFloat();
result.writeFloat(0.5*f1+0.5*f2);
}
Doing an enterframe approach requires your result be available between listener calls, and positions unaltered, with a temporary counter running in the loop which will control "enough converting in this frame". Like this:
var result:ByteArray;
var tracks:Vector.<ByteArray>=[];
var mixFinished:Function; // a callback
function startMixing():void {
// just make it start mixing
for (var i:int=tracks.length;i>=0;i--) tracks[i].position=0;
addEventListener(Event.ENTER_FRAME,doMixing);
result=new ByteArray();
}
function doMixing(e:Event):void {
if (tracks.length==0) {
removeEventListener(Event.ENTER_FRAME,doMixing);
return;
} // sanity check
var mixrate:Number=1.0/tracks.length;
for (var i:int=0;i<2048;i++) { // adjust number accordingly
var tm:int=0; // how many tracks mixed
var f:int=0;
for (var j:int=tracks.length-1;j>=0;j--) {
if (tracks[j].position<tracks[j].length) {
// this track isn't finished
tm++;
f+=tracks[j].readFloat();
}
}
if (tm==0) { // all tracks reached end, stop mixing
removeEventListener(Event.ENTER_FRAME,doMixing);
if (mixFinished!=null) mixFinished(); // do a callback
return;
}
result.writeFloat(f*mixrate);
}
}
With this, you fill tracks, set up mixFinished and call startMixing, then wait until mixFinished would get called, by that time your sound should be mixed properly. If you feel your mixing process should go faster, increase the 2048 value in code appropriately.
As a PHP programmer I'm very habituated to the fact that the program flow goes line by line, if I call function1() that have to return some value I know the program wont continue until that function makes a return.
Now, im developing a AS3 app using AIR, I need to download some images if some conditions are met, don't know how many, so im using a For like this:
for (var w:int=0; w < newData_array[2]['content'].length; w++ ) {
for (var j:int=0; j < oldData_array[2]['content'].length; j++ ) {
if((oldData_array[2]['content'][j]['id'] == newData_array[2]['content'][w]['id']) && (oldData_array[2]['content'][j]['last_mod'] != newData_array[2]['content'][w]['last_mod'])){
//need to download a image...
}
}
}
As you can see im just comparing each element from each array (newData_array and oldData_array). If the condition met, I need to download something, for that I'm using URLloader and as you know this function is asynchronous, adding a listener, an event will be triggered when the download is complete, the problem is very clear, since the urlloader wont stop the for cycle (like I would expect on a PHP alike language) I'm just going to download a bunch of images at the same time creating a disaster because I wont know when to save. So I need to use by any mean the listener, but since I'm not very habituated to this kind of procedures I'm pretty munch stuck.
Im not interested on the save to disk routines, that part is pretty much done, I just want to understand how I should structure this algorithm to make this work.
This annoyed me too, but one has to realize that you can't do something to something that doesn't exist in memory yet, and these loading operations can take quite some time. Being a single-threaded stack, Flash Player's load operations would require that the entire interface to freeze during the load (if restricted to the loop).
Obviously there's data available to the loop that dictates what you do with the image. The solution I've been using is create a custom load function that starts the load, and returns a proxy image . Your loop gets a container back and you can freely place your image where you want.
In the meantime, your loader listener has kept track of the active images loading, and their associated proxies. When loaded, swap the image in.
Your loop would look something like this...
for (var w:int in newData_array[2]['content']) {
for (var j:int in oldData_array[2]['content']) {
if ((oldData_array[2]['content'][j]['id'] == newData_array[2]['content'][w]['id']) && (oldData_array[2]['content'][j]['last_mod'] != newData_array[2]['content'][w]['last_mod'])){
var proxy:MovieClip = loadImage("image/path.jpg");
// Do stuff to proxy.
}
}
}
And your function + listener would look something like this...
var proxies:Object = {};
function loadImage(path:String):MovieClip {
// load Image
var proxy:MovieClip = new MovieClip();
proxies.path = proxy;
// Load Image
}
function imageLoaded(e:Event):void {
// Once loaded, use the filename as the proxy object's key to find the MovieClip to attach the image.
proxies[e.data.loaderInfo.filename].addChild(e.data);
}
This is just off the top of my head, so you'll need to find the actual variable names, but I hope that makes sense.
I am not really sure if I understood your problem but it seems to me that you simply add the according listener in your inner loop.
//take care this is pseudocode
var parent = ... // some stage object
for (var w:int=0; w < size1; w++ ) {
for (var j:int=0; j < size2; j++ ) {
if(some_condition){
request = new URLRequest(getNextImagePath();
urlLoader = new URLLoader();
urlLoader.addEventListener(Event.COMPLETE, onComplete);
urlLoader.load(request);
}
}
}
function onComplete(event:Event) {
parent.addChild(createImageFromData(this.data));
}
I solved the problem using an third party library that pretty munch handles this problem.
https://github.com/arthur-debert/BulkLoader
I have a website in ActionScript 3 that has lots of FLV animations that happen when you press buttons. Right now this is how I have it set up.
in AS3,
im loading FLv's (which are animations I exported in FLV form from After Effects)
with net stream. I have a timer set up for the same amount of length of time that the animations (FLV's) play and when the timer stops it calls a function that closes the stream, opens a new one and plays another video. The only problem I noticed using timers is that if the connection is slow and (animation)stops for a second, the timer keeps going, and calls the next flv too early.
Does anyone know a way to load a flv, or swf for that matter, at the end of play of the flv? so that the next FLV will always play at the end of the run time of the previous FLV, rather than using timers?
im thinking onComplete but I don't know how to implement that!?
Sequential playing is pretty easy to achieve with the OSMF framework, you should check it out. Google "osmf tutorials" and you should find a few tutorials online.
The framework is fairly recent, but it looks like it may become the de facto solution for media delivery in Flash as it's not limited to video but also audio & images.
As a developer you won't have to bother with the NetStream & NetConnection classes. Developing video solutions , as well as audio & images solutions should be streamlined and easier to handle. Only limitation is that it requires Flash 10
Here's some code for checking when a FLV ends with NetStream. I just provide snippets as I assume you got the FLV up and running already.
//create a netstream and pass in your connection
var netStream:NetStream = new NetStream(conn);
//add callback function for PlayStatus -event
var client : Object = {};
client.onPlayStatus = onPlayStatus;
netStream.client = client;
//attach your NetStream to the connection as usual
//---
//function that gets called onPlayStatus
function onPlayStatus(info : Object) : void {
trace("onPlayStatus:" +info.code + " " + info.duration);
if (info.code == "NetStream.Play.Complete") {
//play the next FLV and so on
}
}
EDIT: With your example code it will look something like this.
var nc:NetConnection = new NetConnection();
nc.connect(null);
var ns:NetStream = new NetStream(nc);
var listener:Object = new Object();
listener.onMetaData = function(md:Object):void{};
listener.onPlayStatus = function(info : Object) : void {
trace("onPlayStatus:" +info.code + " " + info.duration);
if (info.code == "NetStream.Play.Complete") {
//play the next FLV and so on
}
};
ns.client = listener;
vid1.attachNetStream(ns);
const moviename1:String = "moviename2.flv";
const moviename1:String = "moviename3.flv";
var movietoplay:String = "moviename.flv";
ns.play(movietoplay);
I have the following piece of code:
var song:Sound;
var sndChannel:SoundChannel;
var context:SoundLoaderContext = new SoundLoaderContext(2000);
function songLoad():void {
song.load(new URLRequest(songs[selected]),context);
sndChannel = song.play();
}
Now I want to be able to check if the song is buffering or not. Is there a way to do this? Or should I approach it differently?
Seems like you could use the isBuffering property of the Sound object.
Maybe you could check it periodically with a Timer or an Event.EnterFrame listener, as long as the sound has not been completely downloaded (i.e. until Event.COMPLETE fires). After that point, it makes no sense to check isBuffering, for obvious reasons, so you could remove the Timer or EnterFrame.