What Options Are There for Cross-Browser Compatible Audio?

问题

I'm using this function:

function playSound(file) {

MyAudio = new Audio(file);
MyAudio.play();

}

Unfortunately, I'm struggling to find a file type which will work in all browsers. Mp3 works in Chrome, Safari, IE but not FF and Opera, while .ogg files only seem to work in FF.

Any suggestions as to a way around this? I presume there is no way of programmatically detecting which browser is being used and then playing the appropriate file type? Any advise/ideas appreciated. Thanks.

回答1:

Frustratingly, there is no universally playable type. WAV comes closest, but it is quite large and is not supported in IE9. You'll need to have multiple types available and choose a type the browser can play.

To do this, use feature detection, not browser detection. The media types that each browser supports will change over time, so your code that assumes Firefox can't play MP3 will probably be outdated a few years from now, when Mozilla adopts it (after the patents expire). Use canPlayType, which indicates if a given format is supported:

var audio = new Audio();
if(audio.canPlayType("audio/mpeg") == "probably") {
    playSound("myMedia.mp3");
} else if(audio.canPlayType("audio/webm") == "probably") {
    playSound("myMedia.webm");
}
// do checks for other types...

Also, if you are writing the audio tag as HTML, you can use multiple <source> tags, and the browser will play the first one it can:

<audio controls="controls">
    <source src="mymedia.ogg" type="audio/ogg" />
    <source src="mymedia.mp3" type="audio/mpeg" />
    Update your browser! This sentence is fallback content for browsers that do not support the audio element at all.
</audio>

If you want to test for Ogg audio support, you probably want to test for Ogg Vorbis specifically. Ogg is a "container" format that can hypothetically use other codecs besides Vorbis and Theora (for example, the Opus format). You can test for Ogg Vorbis like so:

audio.canPlayType('audio/ogg; codecs="vorbis"') == "probably";

Note that canPlayType has three possible return values:

"probably" - the media type can almost certainly be played
"maybe" - the media type might be playable. This is what is returned when you ask about general Ogg support in a browser has Ogg support for specific codecs (i.e. Vorbis and Theora). An Ogg file may use a codec that is not supported by the browser, so if you don't specify the codec, the browser can only guess that it might be able to play it.
"" (the empty string) - the media type is certainly not playable

If you really wanted to test for ogg support, then instead of testing for "probably", you could test for a non-empty string (i.e., test for either "probably" or "maybe"), like so:

// test for *any* Ogg codecs
if(audio.canPlayType("audio/ogg") != "") {  
    playSound("myMedia.ogg");
}

You should test for whatever specific codec your media file uses, e.g., with 'audio/ogg; codecs="vorbis"' for Vorbis. Testing for general Ogg support is not likely to be useful.

回答2:

Use webm for Chrome, Firefox and Opera + wav for Firefox, IE, Safari and Opera.

HTML:

<audio id="audio"></audio>

JS:

var src = "myvideoname";
var is_chrome = navigator.userAgent.toLowerCase().indexOf('chrome') > -1;

if (is_chrome) {
   $("#audio").attr('src', 'audio/' + src + '.webm')
}
else {
   $("#audio").attr('src', 'audio/' + src + '.wav')
}

To explain:
Javascript find out users browser and if it is Chrome it serves webm and if it is not than it use wav

Note: Using this code you need only both webm and wav audio with same name in audio folder.

Note 2: Code needs jQuery.

回答3:

Well, see here: jQuery Buzz extension. Never used it, but heard it should work fine. It's able to check if your browser supports some format, really neat feature.

来源：https://stackoverflow.com/questions/13147951/what-options-are-there-for-cross-browser-compatible-audio

标签

javascript

audio

cross-browser

mp3

ogg