Android. Cómo visualizar el video en la superficie (OpenGL)

Question

necesidad de ayudar a

1. Cómo visualizar el video en Surface(OpenGL) en Android? Intenté reproducir video en mySurfaceView extends SurfaceView con el método de ayuda setSurface() en MediaPlayer.

   SurfaceTexture mTexture = new SurfaceTexture(texture_id); 
   Surface mSurface = new Surface(mTexture); 
   MediaPlayer mp = new MediaPlayer(); 
   mp.setSurface(mSurface); 
   

Me únicamente la reproducción de audio - vídeo no jugar.

2. ¿Cómo obtener el buffer de video para enviar en OpenGL ??
3. ¿Cómo se reproduce el video en GLTexture?

Answer 1

Supongo que no se puede. Al menos eso es lo que descubrí. Mi plan era tener algún tipo de escena OpenGL (ticker de texto) mientras se reproduce un video. Dado que Android utiliza la decodificación HW para mostrar un video, no se realizará con OpenGL. También traté de reproducir el video en OpenGL usando ffmpeg, pero descubrí que ningún dispositivo con el que lo intenté fue lo suficientemente eficiente como para realizar decodificación SW a través de ffmpeg.

Así que tuve que usar un VideoView para mostrar mi video y poner un GLSurfaceView encima, para ver mi texto de cotización. Pero tienes que hacer que GLSurfaceView sea translúcido como en ApiDemos hecho con 'TranslucentGLSurfaceViewActivity'.

Otra cosa que me di cuenta: si pones un GLSurfaceView encima de un VideoView, tu fps se descompone dramáticamente de 60 fps (opengl) a alrededor de 30-40 fps. Esto se aplica a todas las versiones 2.x de Android que probé. La semana pasada tuve la oportunidad de probarlo en Android 4 y esta vez no tengo avería en fps. Tal vez realmente mejoraron la canalización de gráficos para ICS.

Saludos, -Chris-

Answer 2

a partir del código fuente de Android ...

import java.io.IOException; 
import java.nio.ByteBuffer; 
import java.nio.ByteOrder; 
import java.nio.FloatBuffer; 

import javax.microedition.khronos.egl.EGLConfig; 
import javax.microedition.khronos.opengles.GL10; 

import android.content.Context; 
import android.graphics.SurfaceTexture; 
import android.media.MediaPlayer; 
import android.opengl.GLES20; 
import android.opengl.GLSurfaceView; 
import android.opengl.Matrix; 
import android.util.Log; 
import android.view.Surface; 

class VideoSurfaceView extends GLSurfaceView { 

    VideoRender mRenderer; 
    private MediaPlayer mMediaPlayer = null; 

    public VideoSurfaceView(Context context, MediaPlayer mp) { 
     super(context); 

     setEGLContextClientVersion(2); 
     mMediaPlayer = mp; 
     mRenderer = new VideoRender(context); 
     setRenderer(mRenderer); 
    } 

    @Override 
    public void onResume() { 
     queueEvent(new Runnable(){ 
       public void run() { 
        mRenderer.setMediaPlayer(mMediaPlayer); 
       }}); 

     super.onResume(); 
    } 

    private static class VideoRender 
     implements GLSurfaceView.Renderer, SurfaceTexture.OnFrameAvailableListener { 
     private static String TAG = "VideoRender"; 

     private static final int FLOAT_SIZE_BYTES = 4; 
     private static final int TRIANGLE_VERTICES_DATA_STRIDE_BYTES = 5 * FLOAT_SIZE_BYTES; 
     private static final int TRIANGLE_VERTICES_DATA_POS_OFFSET = 0; 
     private static final int TRIANGLE_VERTICES_DATA_UV_OFFSET = 3; 
     private final float[] mTriangleVerticesData = { 
      // X, Y, Z, U, V 
      -1.0f, -1.0f, 0, 0.f, 0.f, 
      1.0f, -1.0f, 0, 1.f, 0.f, 
      -1.0f, 1.0f, 0, 0.f, 1.f, 
      1.0f, 1.0f, 0, 1.f, 1.f, 
     }; 

     private FloatBuffer mTriangleVertices; 

     private final String mVertexShader = 
       "uniform mat4 uMVPMatrix;\n" + 
       "uniform mat4 uSTMatrix;\n" + 
       "attribute vec4 aPosition;\n" + 
       "attribute vec4 aTextureCoord;\n" + 
       "varying vec2 vTextureCoord;\n" + 
       "void main() {\n" + 
       " gl_Position = uMVPMatrix * aPosition;\n" + 
       " vTextureCoord = (uSTMatrix * aTextureCoord).xy;\n" + 
       "}\n"; 

     private final String mFragmentShader = 
       "#extension GL_OES_EGL_image_external : require\n" + 
       "precision mediump float;\n" + 
       "varying vec2 vTextureCoord;\n" + 
       "uniform samplerExternalOES sTexture;\n" + 
       "void main() {\n" + 
       " gl_FragColor = texture2D(sTexture, vTextureCoord);\n" + 
       "}\n"; 

     private float[] mMVPMatrix = new float[16]; 
     private float[] mSTMatrix = new float[16]; 

     private int mProgram; 
     private int mTextureID; 
     private int muMVPMatrixHandle; 
     private int muSTMatrixHandle; 
     private int maPositionHandle; 
     private int maTextureHandle; 

     private SurfaceTexture mSurface; 
     private boolean updateSurface = false; 

     private static int GL_TEXTURE_EXTERNAL_OES = 0x8D65; 

     private MediaPlayer mMediaPlayer; 

     public VideoRender(Context context) { 
      mTriangleVertices = ByteBuffer.allocateDirect(
       mTriangleVerticesData.length * FLOAT_SIZE_BYTES) 
        .order(ByteOrder.nativeOrder()).asFloatBuffer(); 
      mTriangleVertices.put(mTriangleVerticesData).position(0); 

      Matrix.setIdentityM(mSTMatrix, 0); 
     } 

     public void setMediaPlayer(MediaPlayer player) { 
      mMediaPlayer = player; 
     } 

     public void onDrawFrame(GL10 glUnused) { 
      synchronized(this) { 
       if (updateSurface) { 
        mSurface.updateTexImage(); 
        mSurface.getTransformMatrix(mSTMatrix); 
        updateSurface = false; 
       } 
      } 

      GLES20.glClearColor(0.0f, 1.0f, 0.0f, 1.0f); 
      GLES20.glClear(GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT); 

      GLES20.glUseProgram(mProgram); 
      checkGlError("glUseProgram"); 

      GLES20.glActiveTexture(GLES20.GL_TEXTURE0); 
      GLES20.glBindTexture(GL_TEXTURE_EXTERNAL_OES, mTextureID); 

      mTriangleVertices.position(TRIANGLE_VERTICES_DATA_POS_OFFSET); 
      GLES20.glVertexAttribPointer(maPositionHandle, 3, GLES20.GL_FLOAT, false, 
       TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices); 
      checkGlError("glVertexAttribPointer maPosition"); 
      GLES20.glEnableVertexAttribArray(maPositionHandle); 
      checkGlError("glEnableVertexAttribArray maPositionHandle"); 

      mTriangleVertices.position(TRIANGLE_VERTICES_DATA_UV_OFFSET); 
      GLES20.glVertexAttribPointer(maTextureHandle, 3, GLES20.GL_FLOAT, false, 
       TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices); 
      checkGlError("glVertexAttribPointer maTextureHandle"); 
      GLES20.glEnableVertexAttribArray(maTextureHandle); 
      checkGlError("glEnableVertexAttribArray maTextureHandle"); 

      Matrix.setIdentityM(mMVPMatrix, 0); 
      GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, mMVPMatrix, 0); 
      GLES20.glUniformMatrix4fv(muSTMatrixHandle, 1, false, mSTMatrix, 0); 

      GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4); 
      checkGlError("glDrawArrays"); 
      GLES20.glFinish(); 

     } 

     public void onSurfaceChanged(GL10 glUnused, int width, int height) { 

     } 

     public void onSurfaceCreated(GL10 glUnused, EGLConfig config) { 
      mProgram = createProgram(mVertexShader, mFragmentShader); 
      if (mProgram == 0) { 
       return; 
      } 
      maPositionHandle = GLES20.glGetAttribLocation(mProgram, "aPosition"); 
      checkGlError("glGetAttribLocation aPosition"); 
      if (maPositionHandle == -1) { 
       throw new RuntimeException("Could not get attrib location for aPosition"); 
      } 
      maTextureHandle = GLES20.glGetAttribLocation(mProgram, "aTextureCoord"); 
      checkGlError("glGetAttribLocation aTextureCoord"); 
      if (maTextureHandle == -1) { 
       throw new RuntimeException("Could not get attrib location for aTextureCoord"); 
      } 

      muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix"); 
      checkGlError("glGetUniformLocation uMVPMatrix"); 
      if (muMVPMatrixHandle == -1) { 
       throw new RuntimeException("Could not get attrib location for uMVPMatrix"); 
      } 

      muSTMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uSTMatrix"); 
      checkGlError("glGetUniformLocation uSTMatrix"); 
      if (muSTMatrixHandle == -1) { 
       throw new RuntimeException("Could not get attrib location for uSTMatrix"); 
      } 


      int[] textures = new int[1]; 
      GLES20.glGenTextures(1, textures, 0); 

      mTextureID = textures[0]; 
      GLES20.glBindTexture(GL_TEXTURE_EXTERNAL_OES, mTextureID); 
      checkGlError("glBindTexture mTextureID"); 

      GLES20.glTexParameterf(GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MIN_FILTER, 
            GLES20.GL_NEAREST); 
      GLES20.glTexParameterf(GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MAG_FILTER, 
            GLES20.GL_LINEAR); 

      /* 
      * Create the SurfaceTexture that will feed this textureID, 
      * and pass it to the MediaPlayer 
      */ 
      mSurface = new SurfaceTexture(mTextureID); 
      mSurface.setOnFrameAvailableListener(this); 

      Surface surface = new Surface(mSurface); 
      mMediaPlayer.setSurface(surface); 
      surface.release(); 

      try { 
       mMediaPlayer.prepare(); 
      } catch (IOException t) { 
       Log.e(TAG, "media player prepare failed"); 
      } 

      synchronized(this) { 
       updateSurface = false; 
      } 

      mMediaPlayer.start(); 
     } 

     synchronized public void onFrameAvailable(SurfaceTexture surface) { 
      updateSurface = true; 
     } 

     private int loadShader(int shaderType, String source) { 
      int shader = GLES20.glCreateShader(shaderType); 
      if (shader != 0) { 
       GLES20.glShaderSource(shader, source); 
       GLES20.glCompileShader(shader); 
       int[] compiled = new int[1]; 
       GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0); 
       if (compiled[0] == 0) { 
        Log.e(TAG, "Could not compile shader " + shaderType + ":"); 
        Log.e(TAG, GLES20.glGetShaderInfoLog(shader)); 
        GLES20.glDeleteShader(shader); 
        shader = 0; 
       } 
      } 
      return shader; 
     } 

     private int createProgram(String vertexSource, String fragmentSource) { 
      int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexSource); 
      if (vertexShader == 0) { 
       return 0; 
      } 
      int pixelShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource); 
      if (pixelShader == 0) { 
       return 0; 
      } 

      int program = GLES20.glCreateProgram(); 
      if (program != 0) { 
       GLES20.glAttachShader(program, vertexShader); 
       checkGlError("glAttachShader"); 
       GLES20.glAttachShader(program, pixelShader); 
       checkGlError("glAttachShader"); 
       GLES20.glLinkProgram(program); 
       int[] linkStatus = new int[1]; 
       GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus, 0); 
       if (linkStatus[0] != GLES20.GL_TRUE) { 
        Log.e(TAG, "Could not link program: "); 
        Log.e(TAG, GLES20.glGetProgramInfoLog(program)); 
        GLES20.glDeleteProgram(program); 
        program = 0; 
       } 
      } 
      return program; 
     } 

     private void checkGlError(String op) { 
      int error; 
      while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) { 
       Log.e(TAG, op + ": glError " + error); 
       throw new RuntimeException(op + ": glError " + error); 
      } 
     } 

    } // End of class VideoRender. 

} // End of class VideoSurfaceView. 

Answer 3

mMediaPlayer.setSurface(new Surface(mSurfaceTexture)); 

Se puede utilizar por encima de la línea de código para utilizarlo en su mediaPlayerObject sobre su surfaceTexture deseada que es una textura aplicada sobre su superficie.

Espero que ayude.