Android: Move YuvConverter to its own file

webrtc/api/android/java/src/org/webrtc/SurfaceTextureHelper.java

Index: webrtc/api/android/java/src/org/webrtc/SurfaceTextureHelper.java
diff --git a/webrtc/api/android/java/src/org/webrtc/SurfaceTextureHelper.java b/webrtc/api/android/java/src/org/webrtc/SurfaceTextureHelper.java
index 8aaf296703dd93e0c864411a30ffda963fa4abca..e7c767b057ef90dcb18f3eea6b6f18618861a581 100644
--- a/webrtc/api/android/java/src/org/webrtc/SurfaceTextureHelper.java
+++ b/webrtc/api/android/java/src/org/webrtc/SurfaceTextureHelper.java
@@ -75,210 +75,6 @@ class SurfaceTextureHelper {
     });
   }
 
-  // State for YUV conversion, instantiated on demand.
-  static class YuvConverter {
-    private final EglBase eglBase;
-    private final GlShader shader;
-    private boolean released = false;
-
-    // Vertex coordinates in Normalized Device Coordinates, i.e.
-    // (-1, -1) is bottom-left and (1, 1) is top-right.
-    private static final FloatBuffer DEVICE_RECTANGLE = GlUtil.createFloatBuffer(new float[] {
-        -1.0f, -1.0f, // Bottom left.
-        1.0f, -1.0f, // Bottom right.
-        -1.0f, 1.0f, // Top left.
-        1.0f, 1.0f, // Top right.
-    });
-
-    // Texture coordinates - (0, 0) is bottom-left and (1, 1) is top-right.
-    private static final FloatBuffer TEXTURE_RECTANGLE = GlUtil.createFloatBuffer(new float[] {
-        0.0f, 0.0f, // Bottom left.
-        1.0f, 0.0f, // Bottom right.
-        0.0f, 1.0f, // Top left.
-        1.0f, 1.0f // Top right.
-    });
-
-    // clang-format off
-    private static final String VERTEX_SHADER =
-          "varying vec2 interp_tc;\n"
-        + "attribute vec4 in_pos;\n"
-        + "attribute vec4 in_tc;\n"
-        + "\n"
-        + "uniform mat4 texMatrix;\n"
-        + "\n"
-        + "void main() {\n"
-        + "    gl_Position = in_pos;\n"
-        + "    interp_tc = (texMatrix * in_tc).xy;\n"
-        + "}\n";
-
-    private static final String FRAGMENT_SHADER =
-          "#extension GL_OES_EGL_image_external : require\n"
-        + "precision mediump float;\n"
-        + "varying vec2 interp_tc;\n"
-        + "\n"
-        + "uniform samplerExternalOES oesTex;\n"
-        // Difference in texture coordinate corresponding to one
-        // sub-pixel in the x direction.
-        + "uniform vec2 xUnit;\n"
-        // Color conversion coefficients, including constant term
-        + "uniform vec4 coeffs;\n"
-        + "\n"
-        + "void main() {\n"
-        // Since the alpha read from the texture is always 1, this could
-        // be written as a mat4 x vec4 multiply. However, that seems to
-        // give a worse framerate, possibly because the additional
-        // multiplies by 1.0 consume resources. TODO(nisse): Could also
-        // try to do it as a vec3 x mat3x4, followed by an add in of a
-        // constant vector.
-        + "  gl_FragColor.r = coeffs.a + dot(coeffs.rgb,\n"
-        + "      texture2D(oesTex, interp_tc - 1.5 * xUnit).rgb);\n"
-        + "  gl_FragColor.g = coeffs.a + dot(coeffs.rgb,\n"
-        + "      texture2D(oesTex, interp_tc - 0.5 * xUnit).rgb);\n"
-        + "  gl_FragColor.b = coeffs.a + dot(coeffs.rgb,\n"
-        + "      texture2D(oesTex, interp_tc + 0.5 * xUnit).rgb);\n"
-        + "  gl_FragColor.a = coeffs.a + dot(coeffs.rgb,\n"
-        + "      texture2D(oesTex, interp_tc + 1.5 * xUnit).rgb);\n"
-        + "}\n";
-    // clang-format on
-
-    private int texMatrixLoc;
-    private int xUnitLoc;
-    private int coeffsLoc;
-
-    YuvConverter(EglBase.Context sharedContext) {
-      eglBase = EglBase.create(sharedContext, EglBase.CONFIG_PIXEL_RGBA_BUFFER);
-      eglBase.createDummyPbufferSurface();
-      eglBase.makeCurrent();
-
-      shader = new GlShader(VERTEX_SHADER, FRAGMENT_SHADER);
-      shader.useProgram();
-      texMatrixLoc = shader.getUniformLocation("texMatrix");
-      xUnitLoc = shader.getUniformLocation("xUnit");
-      coeffsLoc = shader.getUniformLocation("coeffs");
-      GLES20.glUniform1i(shader.getUniformLocation("oesTex"), 0);
-      GlUtil.checkNoGLES2Error("Initialize fragment shader uniform values.");
-      // Initialize vertex shader attributes.
-      shader.setVertexAttribArray("in_pos", 2, DEVICE_RECTANGLE);
-      // If the width is not a multiple of 4 pixels, the texture
-      // will be scaled up slightly and clipped at the right border.
-      shader.setVertexAttribArray("in_tc", 2, TEXTURE_RECTANGLE);
-      eglBase.detachCurrent();
-    }
-
-    synchronized void convert(
-        ByteBuffer buf, int width, int height, int stride, int textureId, float[] transformMatrix) {
-      if (released) {
-        throw new IllegalStateException("YuvConverter.convert called on released object");
-      }
-
-      // We draw into a buffer laid out like
-      //
-      //    +---------+
-      //    |         |
-      //    |  Y      |
-      //    |         |
-      //    |         |
-      //    +----+----+
-      //    | U  | V  |
-      //    |    |    |
-      //    +----+----+
-      //
-      // In memory, we use the same stride for all of Y, U and V. The
-      // U data starts at offset |height| * |stride| from the Y data,
-      // and the V data starts at at offset |stride/2| from the U
-      // data, with rows of U and V data alternating.
-      //
-      // Now, it would have made sense to allocate a pixel buffer with
-      // a single byte per pixel (EGL10.EGL_COLOR_BUFFER_TYPE,
-      // EGL10.EGL_LUMINANCE_BUFFER,), but that seems to be
-      // unsupported by devices. So do the following hack: Allocate an
-      // RGBA buffer, of width |stride|/4. To render each of these
-      // large pixels, sample the texture at 4 different x coordinates
-      // and store the results in the four components.
-      //
-      // Since the V data needs to start on a boundary of such a
-      // larger pixel, it is not sufficient that |stride| is even, it
-      // has to be a multiple of 8 pixels.
-
-      if (stride % 8 != 0) {
-        throw new IllegalArgumentException("Invalid stride, must be a multiple of 8");
-      }
-      if (stride < width) {
-        throw new IllegalArgumentException("Invalid stride, must >= width");
-      }
-
-      int y_width = (width + 3) / 4;
-      int uv_width = (width + 7) / 8;
-      int uv_height = (height + 1) / 2;
-      int total_height = height + uv_height;
-      int size = stride * total_height;
-
-      if (buf.capacity() < size) {
-        throw new IllegalArgumentException("YuvConverter.convert called with too small buffer");
-      }
-      // Produce a frame buffer starting at top-left corner, not
-      // bottom-left.
-      transformMatrix =
-          RendererCommon.multiplyMatrices(transformMatrix, RendererCommon.verticalFlipMatrix());
-
-      // Create new pBuffferSurface with the correct size if needed.
-      if (eglBase.hasSurface()) {
-        if (eglBase.surfaceWidth() != stride / 4 || eglBase.surfaceHeight() != total_height) {
-          eglBase.releaseSurface();
-          eglBase.createPbufferSurface(stride / 4, total_height);
-        }
-      } else {
-        eglBase.createPbufferSurface(stride / 4, total_height);
-      }
-
-      eglBase.makeCurrent();
-
-      GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
-      GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, textureId);
-      GLES20.glUniformMatrix4fv(texMatrixLoc, 1, false, transformMatrix, 0);
-
-      // Draw Y
-      GLES20.glViewport(0, 0, y_width, height);
-      // Matrix * (1;0;0;0) / width. Note that opengl uses column major order.
-      GLES20.glUniform2f(xUnitLoc, transformMatrix[0] / width, transformMatrix[1] / width);
-      // Y'UV444 to RGB888, see
-      // https://en.wikipedia.org/wiki/YUV#Y.27UV444_to_RGB888_conversion.
-      // We use the ITU-R coefficients for U and V */
-      GLES20.glUniform4f(coeffsLoc, 0.299f, 0.587f, 0.114f, 0.0f);
-      GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
-
-      // Draw U
-      GLES20.glViewport(0, height, uv_width, uv_height);
-      // Matrix * (1;0;0;0) / (width / 2). Note that opengl uses column major order.
-      GLES20.glUniform2f(
-          xUnitLoc, 2.0f * transformMatrix[0] / width, 2.0f * transformMatrix[1] / width);
-      GLES20.glUniform4f(coeffsLoc, -0.169f, -0.331f, 0.499f, 0.5f);
-      GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
-
-      // Draw V
-      GLES20.glViewport(stride / 8, height, uv_width, uv_height);
-      GLES20.glUniform4f(coeffsLoc, 0.499f, -0.418f, -0.0813f, 0.5f);
-      GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
-
-      GLES20.glReadPixels(
-          0, 0, stride / 4, total_height, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, buf);
-
-      GlUtil.checkNoGLES2Error("YuvConverter.convert");
-
-      // Unbind texture. Reportedly needed on some devices to get
-      // the texture updated from the camera.
-      GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, 0);
-      eglBase.detachCurrent();
-    }
-
-    synchronized void release() {
-      released = true;
-      eglBase.makeCurrent();
-      shader.release();
-      eglBase.release();
-    }
-  }
-
   private final Handler handler;
   private final EglBase eglBase;
   private final SurfaceTexture surfaceTexture;