Streamer Library V1.1

XverhelstX · Apr 2, 2011

Streamer Library V1.2 New Version

Hello everyone,

My third library is here:

Streamer Library.
With this library, you are able to stream audio files (only audio files supported yet.)

B4X:

Sub Globals
   'These global variables will be redeclared each time the activity is created.
   'These variables can only be accessed from this module.

   Dim newStream As Streamer
   Dim lblDuration As Label
End Sub

Sub Activity_Create(FirstTime As Boolean)

activity.LoadLayout("Layout")
End Sub

Sub btnStart_Click
Dim THREE_GPP As Int

newStream.StartAudioStream("http://www.freewebs.com/thebirdsmedia/faint.mp3")
'http://www.freewebs.com/thebirdsmedia/faint.mp3
End Sub

Sub btnStop_Click
newStream.StopAudioStream()
End Sub

Sub btnIsStreaming_Click
If newStream.IsStreaming = True Then
Msgbox("test", "It's Streaming!")
Else
Msgbox("test", "Aw to bad!")
End If
End Sub

Sub btnPause_click
Dim test As Int
newStream.PauseStream()
lblDuration.text = newStream.AudioDuration
End Sub

I do think there are quite a few bugs that I cannot seem to solve like the IsStreaming feature as it seems it cannot find the mediaplayer.

I will post some code later.

XverhelstX

susu · Apr 4, 2011

I tested on Emulator with Android 1.6, there're errors:

B4X:

newStream.StopAudioStream()

=> java.lang.NullPointerException

B4X:

lblDuration.text = newStream.AudioDuration

=> It returns -1

Could you please fix it? Thank you.

FMFREAK · Apr 12, 2011

susu said:
I tested on Emulator with Android 1.6, there're errors:

B4X:

newStream.StopAudioStream()

=> java.lang.NullPointerException

I have the same issue. Is there a solution at this moment ?

ZJP · Apr 12, 2011

Same errors with Android 2.2 on Galaxy 5.

JP

XverhelstX · Apr 12, 2011

yep, me to :s

Will look at it tommorrow

xverhelstx

XverhelstX · Apr 14, 2011

I cannot seem to solve this.
If anyone can, here is the source code:

B4X:

package xtremelyvirtualstudios.xvs.Streamer;



import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.util.Log;
import anywheresoftware.b4a.BA.Author;
import anywheresoftware.b4a.BA.Permissions;
import anywheresoftware.b4a.BA.ShortName;
import anywheresoftware.b4a.BA.Version;

@ShortName("Streamer")
@Permissions(values = {"android.permission.WRITE_EXTERNAL_STORAGE", "android.permission.RECORD_AUDIO"})
@Author("XverhelstX")
@Version(1.1f)

public class Streamer {
   
    MediaRecorder mRecorder = null;
    MediaPlayer mPlayer = null;
    private boolean mIsPrepared;
    

       
    /**
     * Starts the audio stream. Can take a while to load and can lagg.
     * for links:  please make sure it ends with audiotypes: 
     * e.g: http://www.freewebs.com/thebirdsmedia/faint.mp3
     */
   
   public void StartAudioStream(String URL) {
       
      
        try {
          MediaPlayer mPlayer = new MediaPlayer();
          mIsPrepared = false;
         mPlayer.setDataSource(URL);
         mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
         mPlayer.prepare();
         mPlayer.start();
        } catch (Exception e) {
         Log.i("Exception", "Exception in streaming mediaplayer e = " + e);
        }
       }

    /**
     * Stops the current stream.
     * 
     */
   public void StopAudioStream() {
      
        mPlayer.stop();
      }
   
   
   public boolean IsStreaming(){
   
      if (mPlayer != null && mIsPrepared) {
            return mPlayer.isPlaying();
        }
      return false;
        
    }
   
    public void PauseStream() {
        if (mPlayer != null && mIsPrepared) {
            if (mPlayer.isPlaying()) {
               mPlayer.pause();
            }
        }
        
    }
    
    public int getAudioDuration() {
        if (mPlayer != null && mIsPrepared) {
            return mPlayer.getDuration();
        }
        return -1;
    }
    
    public boolean canSeekForward() {
        return true;
      }

      public boolean canSeekBackward() {
        return true;
      }

      public boolean canPause() {
        return true;
      }
            
}

agraham · Apr 14, 2011

B4X:

public void StartAudioStream(String URL) {      
  try {
    [COLOR="Red"]MediaPlayer[/COLOR] mPlayer = new MediaPlayer();
    mIsPrepared = false;
    mPlayer.setDataSource(URL);
    mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mPlayer.prepare();
    mPlayer.start();
  } catch (Exception e) {
    Log.i("Exception", "Exception in streaming mediaplayer e = " + e);
  }
}

You are declaring a local variable named mPlayer that is hiding your global variable of the same name so the global variable is never assigned - hence the null pointer exception when you access it. I am a bit surprised you don't get a compiler warning but I haven't tried it for myself.

XverhelstX · Apr 14, 2011

I changed it to this:

B4X:

package xtremelyvirtualstudios.xvs.Streamer;



import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.util.Log;
import anywheresoftware.b4a.BA.Author;
import anywheresoftware.b4a.BA.Permissions;
import anywheresoftware.b4a.BA.ShortName;
import anywheresoftware.b4a.BA.Version;

@ShortName("Streamer")
@Permissions(values = {"android.permission.WRITE_EXTERNAL_STORAGE", "android.permission.RECORD_AUDIO"})
@Author("XverhelstX")
@Version(1.2f)

public class Streamer {
   
    MediaRecorder mRecorder = null;
    MediaPlayer mPlayer = new MediaPlayer();
    private boolean mIsPrepared;
    

       
    /**
     * Starts the audio stream. Can take a while to load and can lagg.
     * for links:  please make sure it ends with audiotypes: 
     * e.g: http://www.freewebs.com/thebirdsmedia/faint.mp3
     */
   
   public void StartAudioStream(String URL) {
       
      
        try {
          mIsPrepared = false;
         mPlayer.setDataSource(URL);
         mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
         mPlayer.prepare();
         mPlayer.start();
        } catch (Exception e) {
         Log.i("Exception", "Exception in streaming mediaplayer e = " + e);
        }
       }

    /**
     * Stops the current stream.
     * 
     */
   public void StopAudioStream() {
      
        mPlayer.stop();
      }
   
   
   public boolean IsStreaming(){
   
      if (mPlayer != null && mIsPrepared) {
            return mPlayer.isPlaying();
        }
      return false;
        
    }
   
    public void PauseStream() {
        if (mPlayer != null && mIsPrepared) {
            if (mPlayer.isPlaying()) {
               mPlayer.pause();
            }
        }
        
    }
    
    public int getAudioDuration() {
        if (mPlayer != null && mIsPrepared) {
            return mPlayer.getDuration();
        }
        return -1;
    }
    
    public boolean canSeekForward() {
        return true;
      }

      public boolean canSeekBackward() {
        return true;
      }

      public boolean canPause() {
        return true;
      }
            
}

stops works now, but pause still declares -1 and isStreaming shows message not streaming.

XverhelstX

agraham · Apr 14, 2011

XverhelstX said:
but pause still declares -1

PauseStream is a void method so doesn't return anything!

B4X:

if (mPlayer != null && mIsPrepared)

As you never set mIsPrepared to True this condition will never be True!

XverhelstX · Apr 14, 2011

Thanks Agraham. Didn't noticed this all :s.

New library V1.2 has been uploaded.

XverhelstX

ZJP · Apr 15, 2011

Hi,

The error has disappeared. But to resume a stream after a stop, we must restart the application.

JP

FMFREAK · Apr 15, 2011

ZJP said:
Hi,

The error has disappeared. But to resume a stream after a stop, we must restart the application.

JP

Nope I have done this by the following part:

B4X:

newStream.StopAudioStream
Dim newStream As Streamer

Create a new newStream after stopping the first one

ZJP · Apr 16, 2011

:sign0060:

mcmanu · Jan 29, 2012

Hi

When you stop the first one and start the second one, then you can not stream the first one again, or is it possible?

shashkiranr · Nov 17, 2013

Hi Thomas,

Could you kindly tell me when to use the Audio duration of this library. Also you have given an option for can seekforwrd or seekbehind. Kindly let me know how to use this also.

Regards.
SK

shashkiranr · Nov 21, 2013

Hi Thomas,

Any Update?

Regards,
SK

Streamer Library V1.1

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