Index: talk/app/webrtc/java/android/org/webrtc/SurfaceTextureHelper.java |
diff --git a/talk/app/webrtc/java/android/org/webrtc/SurfaceTextureHelper.java b/talk/app/webrtc/java/android/org/webrtc/SurfaceTextureHelper.java |
index c730a41b61f34e84e368814150593de18d799fad..cf6fad4fc94cf7137c7b2ff4597be1ae7d2d9b84 100644 |
--- a/talk/app/webrtc/java/android/org/webrtc/SurfaceTextureHelper.java |
+++ b/talk/app/webrtc/java/android/org/webrtc/SurfaceTextureHelper.java |
@@ -35,6 +35,8 @@ import android.os.Handler; |
import android.os.HandlerThread; |
import android.os.SystemClock; |
+import java.nio.ByteBuffer; |
+import java.nio.FloatBuffer; |
import java.util.concurrent.Callable; |
import java.util.concurrent.CountDownLatch; |
import java.util.concurrent.TimeUnit; |
@@ -93,11 +95,214 @@ class SurfaceTextureHelper { |
}); |
} |
+ // State for YUV conversion, instantiated on demand. |
+ static private 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. |
+ }); |
+ |
+ 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"; |
+ |
+ 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); |
+ } |
+ |
+ 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"); |
+ } |
+ 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()); |
+ |
+ try { |
+ // Reuse surface, if possible. TODO(nisse): Add an eglBase |
perkj_webrtc
2015/12/09 09:28:28
I would recommend to do this now or remove the tod
nisse-webrtc
2015/12/09 12:02:21
I'm adding a helper function, withPbufferSurface.
|
+ // helper function, say, makeCurrentWithSize. |
+ 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(); |
+ |
+ GlUtil.checkNoGLES2Error("Initialize fragment shader uniform values."); |
perkj_webrtc
2015/12/09 09:28:28
Can we skip checking for error on every line. Just
nisse-webrtc
2015/12/09 12:02:21
Done.
|
+ |
+ GLES20.glActiveTexture(GLES20.GL_TEXTURE0); |
+ GlUtil.checkNoGLES2Error("Active texture"); |
+ GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, textureId); |
+ GLES20.glUniformMatrix4fv(texMatrixLoc, 1, false, transformMatrix, 0); |
+ |
+ // Draw Y */ |
+ GLES20.glViewport(0, 0, y_width, height); |
+ GlUtil.checkNoGLES2Error("Viewport"); |
+ // 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 |
+ GLES20.glUniform4f(coeffsLoc, 0.299f, 0.587f, 0.114f, 0.0f); |
+ GlUtil.checkNoGLES2Error("Binding texture and matrix"); |
+ |
+ GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4); |
+ GlUtil.checkNoGLES2Error("glDrawArrays, Y"); |
+ |
+ // Draw U */ |
+ GLES20.glViewport(0, height, uv_width, uv_height); |
+ GlUtil.checkNoGLES2Error("Viewport"); |
+ // Matrix * (1;0;0;0) / (2*width). Note that opengl uses column major order. |
+ GLES20.glUniform2f(xUnitLoc, |
+ transformMatrix[0] / (2.0f*width), |
+ transformMatrix[1] / (2.0f*width)); |
+ /* Use ITU-R coefficients for U and V */ |
+ GLES20.glUniform4f(coeffsLoc, -0.169f, -0.331f, 0.499f, 0.5f); |
+ GlUtil.checkNoGLES2Error("Binding texture and matrix"); |
+ |
+ GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4); |
+ GlUtil.checkNoGLES2Error("glDrawArrays, U"); |
+ |
+ // Draw V */ |
+ GLES20.glViewport(stride/8, height, uv_width, uv_height); |
+ GlUtil.checkNoGLES2Error("Viewport"); |
+ /* Use ITU-R coefficients for U and V */ |
+ GLES20.glUniform4f(coeffsLoc, 0.499f, -0.418f, -0.0813f, 0.5f); |
+ GlUtil.checkNoGLES2Error("Binding texture and matrix"); |
+ |
+ GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4); |
+ GlUtil.checkNoGLES2Error("glDrawArrays, V"); |
+ |
+ GLES20.glReadPixels(0, 0, stride/4, total_height, GLES20.GL_RGBA, |
+ GLES20.GL_UNSIGNED_BYTE, buf); |
+ GlUtil.checkNoGLES2Error("glReadPixels"); |
+ |
+ // Unbind texture. Reportedly needed on some devices to get |
+ // the texture updated from the camera. |
+ GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, 0); |
+ } |
+ finally { |
+ eglBase.detachCurrent(); |
+ } |
+ } |
+ |
+ synchronized public void release() { |
+ released = true; |
+ eglBase.makeCurrent(); |
+ shader.release(); |
+ eglBase.release(); |
+ } |
+ } |
+ |
private final Handler handler; |
private boolean isOwningThread; |
private final EglBase eglBase; |
private final SurfaceTexture surfaceTexture; |
private final int oesTextureId; |
+ private YuvConverter yuvConverter; |
+ |
private OnTextureFrameAvailableListener listener; |
// The possible states of this class. |
private boolean hasPendingTexture = false; |
@@ -120,6 +325,18 @@ class SurfaceTextureHelper { |
surfaceTexture = new SurfaceTexture(oesTextureId); |
} |
+ private YuvConverter getYuvConverter() { |
+ // yuvConverter is assign once |
+ if (yuvConverter != null) |
+ return yuvConverter; |
+ |
+ synchronized(this) { |
+ if (yuvConverter == null) |
+ yuvConverter = new YuvConverter(eglBase.getEglBaseContext()); |
+ return yuvConverter; |
+ } |
+ } |
+ |
/** |
* Start to stream textures to the given |listener|. |
* A Listener can only be set once. |
@@ -207,6 +424,14 @@ class SurfaceTextureHelper { |
disconnect(); |
} |
+ public void textureToYUV(ByteBuffer buf, |
+ int width, int height, int stride, int textureId, float [] transformMatrix) { |
+ if (textureId != oesTextureId) |
+ throw new IllegalStateException("textureToByteBuffer called with unexpected textureId"); |
+ |
+ getYuvConverter().convert(buf, width, height, stride, textureId, transformMatrix); |
+ } |
+ |
private void tryDeliverTextureFrame() { |
if (handler.getLooper().getThread() != Thread.currentThread()) { |
throw new IllegalStateException("Wrong thread."); |
@@ -235,6 +460,10 @@ class SurfaceTextureHelper { |
if (isTextureInUse || !isQuitting) { |
throw new IllegalStateException("Unexpected release."); |
} |
+ synchronized (this) { |
+ if (yuvConverter != null) |
+ yuvConverter.release(); |
+ } |
eglBase.makeCurrent(); |
GLES20.glDeleteTextures(1, new int[] {oesTextureId}, 0); |
surfaceTexture.release(); |