For HTML5 Audio, let's say you have a list of two songs you want to play. Currently I have it set up so that when the current song stops playing, it loads the new song and plays it. I want to have it so that it loads the next song while the current song is finishing, maybe 20 seconds before the current song finishes. I tried to change the src attribute for the audio object while the song is playing, but that just immediately stops playback for the current song. Is there some other method that allows me to preload the next song while the current song is playing?
You could use jQuery to create a jQuery object:
var nextSong = document.createElement('audio'); //Creates <audio></audio>
nextSong = $(nextSong); //Converts it to a jQuery object
$(nextSong).attr('autoplay') = false; //You don't want this dynamically loaded audio to start playing automatically
$(nextSong).attr('preload') = "auto"; //Make sure it starts loading the file
$(nextSong).attr('src') = url_to_src; //Loads the src
This should start load the song into an element in the browser's memory and when the song is over, call something like:
$(audio).replace(nextSong);
This isn't tested. You probably don't even need jQuery.
This may work without jQuery:
var nextSong = document.createElement('audio');
nextSong.autoplay = 'false';
nextSong.preload = 'auto';
nextSong.src = url_to_src;
Give it a whirl and let me know!
This might be off the mark, but have you tried calling the element's load() method?
http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#loading-the-media-resource
Edit:
Ah, I think I misunderstood the problem. You want to play two songs back to back in the same media element? I'm not sure how feasible that is... it might be easier to place each song in its own Audio element. You could always dynamically generate these, if you're worried about flexibility.
Related
I'm working on a tour in webvr and using a-frame to build it. I have a bizarre problem. I seem to be able to get aframe to play a video inside a videosphere and correctly display every second of it the first time I enter a new scene, but whenever I exit from it and try to enter it again, only the sound works as supposed. I'm wondering if I'm doing something wrong in the loading of the video or something
I'm collecting the path to the video from a json file in which I describe what each rooms contains (they may have interactable pins for 16:9 video, images and the sort, and also pins that simply load a new scene).
After loading the json, I set the source of the videosphere, name image360, as such:
document.getElementById("image360").setAttribute('src', "#" + jsonArray.zones[zoneID].locations[locationID].name);
I then play the video using the following code :
video = document.querySelector('#' + jsonArray.zones[zoneID].locations[locationID].name);
video.muted = false;
video.addEventListener("ended", videoEnded);
video.play();
The event listener I add to the video takes care of taking the user back to the previous scene once the video ends, which I do using this code:
//This function is called immediately after the end of a 360 video. Thus it first starts by obtaining the scene it should load after the end of the scene
var thisEl = document.querySelector('#' + jsonArray.zones[zoneID].locations[locationID].name);
var currentLocation = jsonArray.zones[zoneID].locations[locationID];
var locationToReturnTo = currentLocation.locationToReturnTo;
var zoneToReturnTo = currentLocation.zoneToReturnTo;
//With the information obtained, the room is then loaded
generateRoom(zoneToReturnTo, locationToReturnTo);
//After loading the room, time to generate the correct pins
generatePins(zoneToReturnTo, locationToReturnTo);
I'm truly at a loss here, and have no idea why this doesn't work. I should note that javascript and aframe are not my area of expertise at all, I just had to pick up this project after a former colleague of mine, who was working on it, left the company abruptly, so excuse me if I'm making a basic mistake.
Thanks in advance.
Switching videos directly on a entity may not work properly:
document.querySelector("a-video").setAttribute("src", "vid.mp4")
because of the current tmp <video> handling.
You should try using the assets management system:
<a-assets>
<video id="vid" src="derby.mp4"></video>
</a-assets>
<!-- Scene. -->
<a-plane src="#vid"></a-plane>
JS
(#vid).setAttribute("src", "newvid.mp4")
A notable issue that's appearing as I'm building a simple audio streaming element in HTML5 is that the <audio> tag doesn't behave as one would expect in regards to playing and pausing a live audio stream.
I'm using the most basic HTML5 code for streaming the audio, an <audio> tag with controls, the source of which is a live stream.
Current outcome: When the stream is first played, it plays whatever is streaming as expected. When it's paused and played again, however, the audio resumes exactly where it left off when the stream was previously paused. The user is now listening to a delayed version of the stream. This occurrence isn't browser-specific.
Desired outcome: When the stream is paused, I want the stream to stop. When it is played again, I want it resume where the stream is currently at, not where it was when the user paused the stream.
Does anyone know of a way to make this audio stream resume properly after it's been paused?
Some failed attempts I've made to fix this issue:
Altering the currentTime of the audio element does nothing to streaming audio.
I've removed the audio element from the DOM when the user stops stream playback and added it back in when user resumes playback. The stream still continues where the user left off and worse yet downloads another copy of the stream behind the scenes.
I've added a random GET variable to the end of the stream URL every time the stream is played in an attempt to fool the browser into believing that it's playing a new stream. Playback still resumes where the user paused the stream.
Best way to stop a stream, and then start it again seems to be removing the source and then calling load:
var sourceElement = document.querySelector("source");
var originalSourceUrl = sourceElement.getAttribute("src");
var audioElement = document.querySelector("audio");
function pause() {
sourceElement.setAttribute("src", "");
audioElement.pause();
// settimeout, otherwise pause event is not raised normally
setTimeout(function () {
audioElement.load(); // This stops the stream from downloading
});
}
function play() {
if (!sourceElement.getAttribute("src")) {
sourceElement.setAttribute("src", originalSourceUrl);
audioElement.load(); // This restarts the stream download
}
audioElement.play();
}
Resetting the audio source and calling the load() method seems to be the simplest solution when you want to stop downloading from the stream.
Since it's a stream, the browser will stop downloading only when the user gets offline. Resetting is necessary to protect your users from burning through their cellular data or to avoid serving outdated content that the browser downloaded when they paused the audio.
Keep in mind though that when the source attribute is set to an empty string, like so audio.src = "", the audio source will instead be set to the page's hostname. If you use a random word, that word will be appended as a path.
So as seen below, setting audio.src ="", means that audio.src === "https://stacksnippets.net/js". Setting audio.src="meow" will make the source be audio.src === "https://stacksnippets.net/js/meow" instead. Thus the 3d paragraph is not visible.
const audio1 = document.getElementById('audio1');
const audio2 = document.getElementById('audio2');
document.getElementById('p1').innerHTML = `First audio source: ${audio1.src}`;
document.getElementById('p2').innerHTML = `Second audio source: ${audio2.src}`;
if (audio1.src === "") {
document.getElementById('p3').innerHTML = "You can see me because the audio source is set to an empty string";
}
<audio id="audio1" src=""></audio>
<audio id="audio2" src="meow"></audio>
<p id="p1"></p>
<p id="p2"></p>
<p id="p3"></p>
Be aware of that behavior if you do rely on the audio's source at a given moment. Using the about URI scheme seems to trick it into behaving in a more reliable way. So using "about:" or "about:about", "about:blank", etc. will work fine.
const resetAudioSource = "about:"
const audio = document.getElementById('audio');
audio.src = resetAudioSource;
document.getElementById('p1').innerHTML = `Audio source: -- "${audio.src}"`;
// Somewhere else in your code...
if (audio.src === resetAudioSource){
document.getElementById('p2').innerHTML = "You can see me because you reset the audio source."
}
<audio id="audio"></audio>
<p id="p1"></p>
<p id="p2"></p>
Resetting the audio.src and calling the .load() method will make the audio to try to load the new source. The above comes in handy if you want to show a spinner component while the audio is loading, but don't want to also show that component when you reset your audio source.
A working example can be found here: https://jsfiddle.net/v2xuczrq/
If the source is reset using a random word, then you might end up with the loader showing up when you also pause the audio, or until the onError event handler catches it. https://jsfiddle.net/jcwvue0s/
UPDATE: The strings "javascript:;" and "javascript:void(0)" can be used instead of the "about:" URI and this seems to work even better as it will also stop the console warnings caused by "about:".
Note: I'm leaving this answer for the sake of posterity, since it was the best solution I or anyone could come up with at the time for my issue. But I've since marked Ciantic's later idea as the best solution because it actually stops the stream downloading and playback like I originally wanted. Consider that solution instead of this one.
One solution I came up with while troubleshooting this issue was to ignore the play and pause functions on the audio element entirely and just set the volume property of the audio element to 0 when user wishes to stop playback and then set the volume property back to 1 when the user wishes to resume playback.
The JavaScript code for such a function would look much like this if you're using jQuery (also demonstrated in this fiddle):
/*
* Play/Stop Live Audio Streams
* "audioElement" should be a jQuery object
*/
function streamPlayStop(audioElement) {
if (audioElement[0].paused) {
audioElement[0].play();
} else if (!audioElement[0].volume) {
audioElement[0].volume = 1;
} else {
audioElement[0].volume = 0;
}
}
I should caution that even though this achieves the desired functionality for stopping and resuming live audio streams, it isn't ideal because the stream, when stopped, is actually still playing and being downloaded in the background, using up bandwidth in the process.
However, this solution doesn't necessarily take up more bandwidth than just using .play() and .pause() on a streaming audio element. Simply using the audio tag with streaming audio uses up a great deal of bandwidth anyway, because once streaming audio is played, it continues to download the contents of the stream in the background when it is paused.
It should be noted that this method won't work in iOS because of purposefully built-in limitations for iPhones and iPads:
On iOS devices, the audio level is always under the user’s physical control. The volume property is not settable in JavaScript. Reading the volume property always returns 1.
If you choose to use the workaround in this answer, you'll need to create a fallback for iOS devices that uses the play() and pause() functions normally, or your interface will be unable to pause the stream.
Tested #Ciantics code and it worked with some modifications, if you want to use multiple sources.
As the source is getting removed, the HTML audio player becomes inactive, so the source (URL) needs to be added directly after again to become active.
Also added an event listener at the end to connect the function when pausing:
var audioElement = document.querySelector("audio");
var sources = document.querySelector("audio").children;
var sourceList = [];
for(i=0;i<sources.length;i++){
sourceList[i] = sources[i].getAttribute("src");
}
function pause() {
for(i=0;i<sources.length;i++){
sources[i].setAttribute("src", "");
}
audioElement.pause();
// settimeout, otherwise pause event is not raised normally
setTimeout(function () {
audioElement.load(); // This stops the stream from downloading
});
for(i=0;i<sources.length;i++){
if (!sources[i].getAttribute("src")) {
sources[i].setAttribute("src", sourceList[i]);
audioElement.load(); // This restarts the stream download
}
}
}
audioElement.addEventListener("pause", pause);
I am building a browser songs personalized application. I am in the starting phase of the application where I want to click a button and change the song currently being played by the audio player in HTML5. I wanted to know how can I change the source of the audio. I tried using a ajax call when the button is clicked and then the following commands
var audio= document.getElementById("myplayer");
audio.src="E:/My Collection/abcd.mp3";
But this doesn't work and the same audio song continues. Can anyone help me with this. Thank You.
Take the list of your audio file in an array.
var audioArr = new Array();
audioArr = ["abc.mp3", "xyz.mp3"];
And, then onclick() of button you can pass index. Eg:
audio.src = audioArr[index];
I hope this works :)
in addition to what Bhavya said about array, add audio.load(); or audio.play(); after changing the src. it would make the audio tag reload.
I am using the following code, in the last line when I play the sound I can still hear it even when I have transformed it to 0.
var tempTransform:SoundTransform = new SoundTransform(0,0.5);
clickSoundChannel = clickSound.play();
clickSoundChannel.soundTransform = tempTransform;
clickSound.play();
You're calling clickSound.play() twice, and you're only muting the first one.
I am trying to stop the audio of the video swf and I can't get it to stop. Here is my code for loading the file:
var myLoader:Loader= new Loader();
myLoader.x=420;
myLoader.y=200;
// boolean variable set for use below in our function
var screenCheck:Boolean = false;
//These three linces keep stafe elements the same size, so they don't distort
var swfStage:Stage = this.stage;
video_btn.addEventListener(MouseEvent.CLICK,contentvideo);
function contentvideo (event:MouseEvent):void{
myLoader.load(new URLRequest("prevideo.swf"));
addChild(myLoader);
movie_btn.stop();
movie_btn.visible=false;
}
Now I have other functions that load different URLRequest and when they are loading, the audio keeps playing. Do I have to add a line of code to them? I also have an MP3 player and tried SoundMixer.stopAll(). I still need the mp3 player to keep playing.
I'm not familiar with what you're doing but just looking at the code and given the problem you're experiencing I wonder if that
addChild(myLoader);
has anything to do with it. It seems like the kind of thing that could easily create multiple child objects which is why you continue to experience the sound play back. Is there a removeChild[0] option or something?
A shot in the dark I know but I thought I'd offer the possibility anyway.