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Add bitmap overlay effect to transformer demo.
The new demo GlFrameProcessor is based on BitmapOverlayVideoProcessor from the gl-demo. The demo-only GlFrameProcessor can be deleted once Transformer supports this functionality. PiperOrigin-RevId: 440059735
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demos/transformer/src/main/assets/fragment_shader_bitmap_overlay_es2.glsl
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#version 100 | ||
// Copyright 2022 The Android Open Source Project | ||
// | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
// Unless required by applicable law or agreed to in writing, software | ||
// distributed under the License is distributed on an "AS IS" BASIS, | ||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
// See the License for the specific language governing permissions and | ||
// limitations under the License. | ||
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// ES 2 fragment shader that overlays the bitmap from uTexSampler1 over a video | ||
// frame from uTexSampler0. | ||
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precision mediump float; | ||
// Texture containing an input video frame. | ||
uniform sampler2D uTexSampler0; | ||
// Texture containing the overlap bitmap. | ||
uniform sampler2D uTexSampler1; | ||
// Horizontal scaling factor for the overlap bitmap. | ||
uniform float uScaleX; | ||
// Vertical scaling factory for the overlap bitmap. | ||
uniform float uScaleY; | ||
varying vec2 vTexSamplingCoord; | ||
void main() { | ||
vec4 videoColor = texture2D(uTexSampler0, vTexSamplingCoord); | ||
vec4 overlayColor = texture2D(uTexSampler1, | ||
vec2(vTexSamplingCoord.x * uScaleX, | ||
vTexSamplingCoord.y * uScaleY)); | ||
// Blend the video decoder output and the overlay bitmap. | ||
gl_FragColor = videoColor * (1.0 - overlayColor.a) | ||
+ overlayColor * overlayColor.a; | ||
} |
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.../main/java/com/google/android/exoplayer2/transformerdemo/BitmapOverlayFrameProcessor.java
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/* | ||
* Copyright 2022 The Android Open Source Project | ||
* | ||
* Licensed under the Apache License, Version 2.0 (the "License"); | ||
* you may not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
*/ | ||
package com.google.android.exoplayer2.transformerdemo; | ||
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import static com.google.android.exoplayer2.util.Assertions.checkStateNotNull; | ||
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import android.content.Context; | ||
import android.content.pm.PackageManager; | ||
import android.graphics.Bitmap; | ||
import android.graphics.Canvas; | ||
import android.graphics.Color; | ||
import android.graphics.Matrix; | ||
import android.graphics.Paint; | ||
import android.graphics.drawable.BitmapDrawable; | ||
import android.opengl.GLES20; | ||
import android.opengl.GLUtils; | ||
import android.util.Size; | ||
import com.google.android.exoplayer2.C; | ||
import com.google.android.exoplayer2.transformer.GlFrameProcessor; | ||
import com.google.android.exoplayer2.util.GlProgram; | ||
import com.google.android.exoplayer2.util.GlUtil; | ||
import java.io.IOException; | ||
import java.util.Locale; | ||
import org.checkerframework.checker.nullness.qual.MonotonicNonNull; | ||
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/** | ||
* A {@link GlFrameProcessor} that overlays a bitmap with a logo and timer on each frame. | ||
* | ||
* <p>The bitmap is drawn using an Android {@link Canvas}. | ||
*/ | ||
// TODO(b/227625365): Delete this class and use a frame processor from the Transformer library, once | ||
// overlaying a bitmap and text is supported in Transformer. | ||
/* package */ final class BitmapOverlayFrameProcessor implements GlFrameProcessor { | ||
static { | ||
GlUtil.glAssertionsEnabled = true; | ||
} | ||
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private static final String VERTEX_SHADER_PATH = "vertex_shader_copy_es2.glsl"; | ||
private static final String FRAGMENT_SHADER_PATH = "fragment_shader_bitmap_overlay_es2.glsl"; | ||
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private static final int BITMAP_WIDTH_HEIGHT = 512; | ||
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private final Context context; | ||
private final Paint paint; | ||
private final Bitmap overlayBitmap; | ||
private final Bitmap logoBitmap; | ||
private final Canvas overlayCanvas; | ||
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private float bitmapScaleX; | ||
private float bitmapScaleY; | ||
private int bitmapTexId; | ||
private @MonotonicNonNull Size outputSize; | ||
private @MonotonicNonNull GlProgram glProgram; | ||
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public BitmapOverlayFrameProcessor(Context context) { | ||
this.context = context; | ||
paint = new Paint(); | ||
paint.setTextSize(64); | ||
paint.setAntiAlias(true); | ||
paint.setARGB(0xFF, 0xFF, 0xFF, 0xFF); | ||
paint.setColor(Color.GRAY); | ||
overlayBitmap = | ||
Bitmap.createBitmap(BITMAP_WIDTH_HEIGHT, BITMAP_WIDTH_HEIGHT, Bitmap.Config.ARGB_8888); | ||
overlayCanvas = new Canvas(overlayBitmap); | ||
try { | ||
logoBitmap = | ||
((BitmapDrawable) | ||
context.getPackageManager().getApplicationIcon(context.getPackageName())) | ||
.getBitmap(); | ||
} catch (PackageManager.NameNotFoundException e) { | ||
throw new IllegalStateException(e); | ||
} | ||
} | ||
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@Override | ||
public void initialize(int inputTexId, int inputWidth, int inputHeight) throws IOException { | ||
if (inputWidth > inputHeight) { | ||
bitmapScaleX = inputWidth / (float) inputHeight; | ||
bitmapScaleY = 1f; | ||
} else { | ||
bitmapScaleX = 1f; | ||
bitmapScaleY = inputHeight / (float) inputWidth; | ||
} | ||
outputSize = new Size(inputWidth, inputHeight); | ||
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bitmapTexId = GlUtil.createTexture(BITMAP_WIDTH_HEIGHT, BITMAP_WIDTH_HEIGHT); | ||
GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, /* level= */ 0, overlayBitmap, /* border= */ 0); | ||
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glProgram = new GlProgram(context, VERTEX_SHADER_PATH, FRAGMENT_SHADER_PATH); | ||
// Draw the frame on the entire normalized device coordinate space, from -1 to 1, for x and y. | ||
glProgram.setBufferAttribute( | ||
"aFramePosition", GlUtil.getNormalizedCoordinateBounds(), GlUtil.RECTANGLE_VERTICES_COUNT); | ||
glProgram.setBufferAttribute( | ||
"aTexSamplingCoord", GlUtil.getTextureCoordinateBounds(), GlUtil.RECTANGLE_VERTICES_COUNT); | ||
glProgram.setSamplerTexIdUniform("uTexSampler0", inputTexId, /* texUnitIndex= */ 0); | ||
glProgram.setSamplerTexIdUniform("uTexSampler1", bitmapTexId, /* texUnitIndex= */ 1); | ||
glProgram.setFloatUniform("uScaleX", bitmapScaleX); | ||
glProgram.setFloatUniform("uScaleY", bitmapScaleY); | ||
} | ||
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@Override | ||
public Size getOutputSize() { | ||
return checkStateNotNull(outputSize); | ||
} | ||
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@Override | ||
public void updateProgramAndDraw(long presentationTimeUs) { | ||
checkStateNotNull(glProgram); | ||
glProgram.use(); | ||
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// Draw to the canvas and store it in a texture. | ||
String text = | ||
String.format(Locale.US, "%.02f", presentationTimeUs / (float) C.MICROS_PER_SECOND); | ||
overlayBitmap.eraseColor(Color.TRANSPARENT); | ||
overlayCanvas.drawBitmap(logoBitmap, /* left= */ 3, /* top= */ 378, paint); | ||
overlayCanvas.drawText(text, /* x= */ 160, /* y= */ 466, paint); | ||
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, bitmapTexId); | ||
GLUtils.texSubImage2D( | ||
GLES20.GL_TEXTURE_2D, | ||
/* level= */ 0, | ||
/* xoffset= */ 0, | ||
/* yoffset= */ 0, | ||
flipBitmapVertically(overlayBitmap)); | ||
GlUtil.checkGlError(); | ||
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glProgram.bindAttributesAndUniforms(); | ||
// The four-vertex triangle strip forms a quad. | ||
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, /* first= */ 0, /* count= */ 4); | ||
} | ||
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@Override | ||
public void release() { | ||
if (glProgram != null) { | ||
glProgram.delete(); | ||
} | ||
} | ||
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private static Bitmap flipBitmapVertically(Bitmap bitmap) { | ||
Matrix flip = new Matrix(); | ||
flip.postScale(1f, -1f); | ||
return Bitmap.createBitmap( | ||
bitmap, | ||
/* x= */ 0, | ||
/* y= */ 0, | ||
bitmap.getWidth(), | ||
bitmap.getHeight(), | ||
flip, | ||
/* filter= */ true); | ||
} | ||
} |
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