Download and save www......mp3 file

Unity Engine
1

Hi, i’m developing a mobile application (iOS/Android) with some long mp3 and wav files (>10 min).
I’d like to put the mp3 file on a server and at the first app opening, the user can download the songs via www features.

WWW www = new WWW(url);
yield return www;
What to do with www.audioClip???

But i don’t know how to save the .mp3 file into the app to avoid downloading the song everytime, and how to load it later.

Thanks
Leo

2

The ‘bytes’ property of the www after it’s been completed contains the actual raw data:

You can save that with any standard method that one saves a byte array. Like File.WriteAllBytes:

WWW www = new WWW(url);
yield return www;
System.IO.File.WriteAllBytes(@"C:\SomeFolder\SomeAudioClip.mp3", www.bytes);
1 Like
3

Thanks a lot.
And to load it once the app has been closed and reopen? I should use :

?

Thanks

4

sure…

Are you doing this so that the mp3 gets cached so the next time you go to get it, you don’t have to dl it again?

Note that AssetBundles can be downloaded and cached, which will do this for you (you’d distribute your mp3’s in an AssetBundle). They’re nice because you can version AssetBundles as well so you can flag mandatory updates to the AssetBundle through the AssetBundle version. See:

5

Yes exactly. I’ll work on it tomorow.
Thanks for the advice lordofduct

6

I would assume you can do this with asset bundles as well. Cache the bundle and load it.

7

I tried something like that :

public AudioClip audiolist;

IEnumerator getsounds () {
while (!Caching.ready) yield return null;
        var www = WWW.LoadFromCacheOrDownload("http://www.myurl.com/mysound.wav", 5);
        yield return www;
        if(!string.IsNullOrEmpty(www.error))
        {
            Debug.Log(www.error);
            //return;
        }
        var myLoadedAssetBundle = www.assetBundle;
        var asset = myLoadedAssetBundle.mainAsset;
        audiolist=asset.audioClip;
        Debug.Log("Load over");

But it doesn’t work, not sure how tu use “assetBundle” to get the audioclip.

I also tried write and readallbyte.

WWW www = new WWW("http://www.myurl.com/mysound.wav");
            yield return www;
            audiolist=www.audioClip;
            Debug.Log("Download over");
            System.IO.File.WriteAllBytes(Application.dataPath + "/../Assets/Ressources/audio1.wav", www.bytes);

Working well, i can see my file into my Resources folder.

Then when i’m trying to load it :

byte[] levelData = System.IO.File.ReadAllBytes(Application.dataPath + "/../Assets/Ressources/audio1.wav");//full local save file
            float[] f = ConvertByteToFloat(levelData);
            audiolist=AudioClip.Create("testSound", f.Length, 1, 44100, false, false);
               audiolist.GetData(f, 0);

Function ConvertBytoFloat :

private float[] ConvertByteToFloat(byte[] array)
            {
                float[] floatArr = new float[array.Length / 4];
                for (int i = 0; i < floatArr.Length; i++)
                {
                    if (BitConverter.IsLittleEndian)
                        Array.Reverse(array, i * 4, 4);
                    floatArr[i] = BitConverter.ToSingle(array, i * 4);
                }
                return floatArr;
            }

Using unity 5.3 Free

8

To read the audio from cache use following snippet

            WWW www = new WWW("file:///" + [URL='http://unity3d.com/support/documentation/ScriptReference/30_search.html?q=Application']Application[/URL].[URL='http://unity3d.com/support/documentation/ScriptReference/30_search.html?q=dataPath']dataPath[/URL] + "/../Assets/Ressources/audio1.wav");
            yield return www;
            audiolist=www.audioClip;
            Debug.Log("Loading audio over");
9

You do not have to write so much stories…Unity solved this…just get your audio from UnityWebRiquest.

IEnumerator GetAudioClip()
    {
        using (UnityWebRequest www = UnityWebRequestMultimedia.GetAudioClip("http://www.my-server.com/audio.ogg", AudioType.OGGVORBIS))
        {
            yield return www.Send();

            if (www.isError)
            {
                Debug.Log(www.error);
            }
            else
            {
                AudioClip myClip = DownloadHandlerAudioClip.GetContent(www);
            }
        }
    }
10

and write this replace DownloadOrLoadFromCash…this is obsolete…

if(!System.IO.File.Exist("path")){
//downloadAudio()
}else{
StartCoroutine(GetAudioClip());
}