gst-sdk/tutorials/android-tutorial-3/src/com/gst_sdk_tutorials/tutorial_3/Tutorial3.java

   1 package com.gst_sdk_tutorials.tutorial_3;
   2
   3 import android.app.Activity;
   4 import android.os.Bundle;
   5 import android.util.Log;
   6 import android.view.SurfaceHolder;
   7 import android.view.SurfaceView;
   8 import android.view.View;
   9 import android.view.View.OnClickListener;
  10 import android.widget.ImageButton;
  11 import android.widget.TextView;
  12 import android.widget.Toast;
  13
  14 import org.freedesktop.gstreamer.GStreamer;
  15
  16 public class Tutorial3 extends Activity implements SurfaceHolder.Callback {
  17     private native void nativeInit();     // Initialize native code, build pipeline, etc
  18     private native void nativeFinalize(); // Destroy pipeline and shutdown native code
  19     private native void nativePlay();     // Set pipeline to PLAYING
  20     private native void nativePause();    // Set pipeline to PAUSED
  21     private static native boolean nativeClassInit(); // Initialize native class: cache Method IDs for callbacks
  22     private native void nativeSurfaceInit(Object surface);
  23     private native void nativeSurfaceFinalize();
  24     private long native_custom_data;      // Native code will use this to keep private data
  25
  26     private boolean is_playing_desired;   // Whether the user asked to go to PLAYING
  27
  28     // Called when the activity is first created.
  29     @Override
  30     public void onCreate(Bundle savedInstanceState)
  31     {
  32         super.onCreate(savedInstanceState);
  33
  34         // Initialize GStreamer and warn if it fails
  35         try {
  36             GStreamer.init(this);
  37         } catch (Exception e) {
  38             Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
  39             finish();
  40             return;
  41         }
  42
  43         setContentView(R.layout.main);
  44
  45         ImageButton play = (ImageButton) this.findViewById(R.id.button_play);
  46         play.setOnClickListener(new OnClickListener() {
  47             public void onClick(View v) {
  48                 is_playing_desired = true;
  49                 nativePlay();
  50             }
  51         });
  52
  53         ImageButton pause = (ImageButton) this.findViewById(R.id.button_stop);
  54         pause.setOnClickListener(new OnClickListener() {
  55             public void onClick(View v) {
  56                 is_playing_desired = false;
  57                 nativePause();
  58             }
  59         });
  60
  61         SurfaceView sv = (SurfaceView) this.findViewById(R.id.surface_video);
  62         SurfaceHolder sh = sv.getHolder();
  63         sh.addCallback(this);
  64
  65         if (savedInstanceState != null) {
  66             is_playing_desired = savedInstanceState.getBoolean("playing");
  67             Log.i ("GStreamer", "Activity created. Saved state is playing:" + is_playing_desired);
  68         } else {
  69             is_playing_desired = false;
  70             Log.i ("GStreamer", "Activity created. There is no saved state, playing: false");
  71         }
  72
  73         // Start with disabled buttons, until native code is initialized
  74         this.findViewById(R.id.button_play).setEnabled(false);
  75         this.findViewById(R.id.button_stop).setEnabled(false);
  76
  77         nativeInit();
  78     }
  79
  80     protected void onSaveInstanceState (Bundle outState) {
  81         Log.d ("GStreamer", "Saving state, playing:" + is_playing_desired);
  82         outState.putBoolean("playing", is_playing_desired);
  83     }
  84
  85     protected void onDestroy() {
  86         nativeFinalize();
  87         super.onDestroy();
  88     }
  89
  90     // Called from native code. This sets the content of the TextView from the UI thread.
  91     private void setMessage(final String message) {
  92         final TextView tv = (TextView) this.findViewById(R.id.textview_message);
  93         runOnUiThread (new Runnable() {
  94           public void run() {
  95             tv.setText(message);
  96           }
  97         });
  98     }
  99
 100     // Called from native code. Native code calls this once it has created its pipeline and
 101     // the main loop is running, so it is ready to accept commands.
 102     private void onGStreamerInitialized () {
 103         Log.i ("GStreamer", "Gst initialized. Restoring state, playing:" + is_playing_desired);
 104         // Restore previous playing state
 105         if (is_playing_desired) {
 106             nativePlay();
 107         } else {
 108             nativePause();
 109         }
 110
 111         // Re-enable buttons, now that GStreamer is initialized
 112         final Activity activity = this;
 113         runOnUiThread(new Runnable() {
 114             public void run() {
 115                 activity.findViewById(R.id.button_play).setEnabled(true);
 116                 activity.findViewById(R.id.button_stop).setEnabled(true);
 117             }
 118         });
 119     }
 120
 121     static {
 122         System.loadLibrary("gstreamer_android");
 123         System.loadLibrary("tutorial-3");
 124         nativeClassInit();
 125     }
 126
 127     public void surfaceChanged(SurfaceHolder holder, int format, int width,
 128             int height) {
 129         Log.d("GStreamer", "Surface changed to format " + format + " width "
 130                 + width + " height " + height);
 131         nativeSurfaceInit (holder.getSurface());
 132     }
 133
 134     public void surfaceCreated(SurfaceHolder holder) {
 135         Log.d("GStreamer", "Surface created: " + holder.getSurface());
 136     }
 137
 138     public void surfaceDestroyed(SurfaceHolder holder) {
 139         Log.d("GStreamer", "Surface destroyed");
 140         nativeSurfaceFinalize ();
 141     }
 142
 143 }