Create a hardware VideoDecoder implementation using Android MediaCodec.
BUG=webrtc:7760
Change-Id: Ieae3852d22cadf24cf4184ae985062918a85f02c
Reviewed-on: https://chromium-review.googlesource.com/536237
Commit-Queue: Bjorn Mellem <mellem@webrtc.org>
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Peter Thatcher <pthatcher@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#18685}diff --git a/webrtc/sdk/android/BUILD.gn b/webrtc/sdk/android/BUILD.gn
index 5e4797e..b12746d 100644
--- a/webrtc/sdk/android/BUILD.gn
+++ b/webrtc/sdk/android/BUILD.gn
@@ -389,6 +389,7 @@
"src/java/org/webrtc/EglBase10.java",
"src/java/org/webrtc/EglBase14.java",
"src/java/org/webrtc/FramerateBitrateAdjuster.java",
+ "src/java/org/webrtc/HardwareVideoDecoder.java",
"src/java/org/webrtc/HardwareVideoEncoder.java",
"src/java/org/webrtc/Histogram.java",
"src/java/org/webrtc/I420BufferImpl.java",
diff --git a/webrtc/sdk/android/api/org/webrtc/VideoDecoder.java b/webrtc/sdk/android/api/org/webrtc/VideoDecoder.java
index e75975c..f5d8850 100644
--- a/webrtc/sdk/android/api/org/webrtc/VideoDecoder.java
+++ b/webrtc/sdk/android/api/org/webrtc/VideoDecoder.java
@@ -18,9 +18,13 @@
/** Settings passed to the decoder by WebRTC. */
public class Settings {
public final int numberOfCores;
+ public final int width;
+ public final int height;
- public Settings(int numberOfCores) {
+ public Settings(int numberOfCores, int width, int height) {
this.numberOfCores = numberOfCores;
+ this.width = width;
+ this.height = height;
}
}
@@ -50,15 +54,15 @@
* Initializes the decoding process with specified settings. Will be called on the decoding thread
* before any decode calls.
*/
- void initDecode(Settings settings, Callback decodeCallback);
+ VideoCodecStatus initDecode(Settings settings, Callback decodeCallback);
/**
* Called when the decoder is no longer needed. Any more calls to decode will not be made.
*/
- void release();
+ VideoCodecStatus release();
/**
* Request the decoder to decode a frame.
*/
- void decode(EncodedImage frame, DecodeInfo info);
+ VideoCodecStatus decode(EncodedImage frame, DecodeInfo info);
/**
* The decoder should return true if it prefers late decoding. That is, it can not decode
* infinite number of frames before the decoded frame is consumed.
diff --git a/webrtc/sdk/android/src/java/org/webrtc/HardwareVideoDecoder.java b/webrtc/sdk/android/src/java/org/webrtc/HardwareVideoDecoder.java
new file mode 100644
index 0000000..3aea481
--- /dev/null
+++ b/webrtc/sdk/android/src/java/org/webrtc/HardwareVideoDecoder.java
@@ -0,0 +1,558 @@
+/*
+ * Copyright 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.webrtc;
+
+import android.annotation.TargetApi;
+import android.graphics.Matrix;
+import android.media.MediaCodec;
+import android.media.MediaCodecInfo.CodecCapabilities;
+import android.media.MediaFormat;
+import android.os.SystemClock;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.Arrays;
+import java.util.Deque;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.LinkedBlockingDeque;
+import org.webrtc.ThreadUtils.ThreadChecker;
+
+/** Android hardware video decoder. */
+@TargetApi(16)
+@SuppressWarnings("deprecation") // Cannot support API 16 without using deprecated methods.
+class HardwareVideoDecoder implements VideoDecoder {
+ private static final String TAG = "HardwareVideoDecoder";
+
+ // TODO(magjed): Use MediaFormat.KEY_* constants when part of the public API.
+ private static final String MEDIA_FORMAT_KEY_STRIDE = "stride";
+ private static final String MEDIA_FORMAT_KEY_SLICE_HEIGHT = "slice-height";
+ private static final String MEDIA_FORMAT_KEY_CROP_LEFT = "crop-left";
+ private static final String MEDIA_FORMAT_KEY_CROP_RIGHT = "crop-right";
+ private static final String MEDIA_FORMAT_KEY_CROP_TOP = "crop-top";
+ private static final String MEDIA_FORMAT_KEY_CROP_BOTTOM = "crop-bottom";
+
+ // NV12 color format supported by QCOM codec, but not declared in MediaCodec -
+ // see /hardware/qcom/media/mm-core/inc/OMX_QCOMExtns.h
+ private static final int COLOR_QCOM_FORMATYVU420PackedSemiPlanar32m4ka = 0x7FA30C01;
+ private static final int COLOR_QCOM_FORMATYVU420PackedSemiPlanar16m4ka = 0x7FA30C02;
+ private static final int COLOR_QCOM_FORMATYVU420PackedSemiPlanar64x32Tile2m8ka = 0x7FA30C03;
+ private static final int COLOR_QCOM_FORMATYUV420PackedSemiPlanar32m = 0x7FA30C04;
+
+ // MediaCodec.release() occasionally hangs. Release stops waiting and reports failure after
+ // this timeout.
+ private static final int MEDIA_CODEC_RELEASE_TIMEOUT_MS = 5000;
+
+ // Dequeuing an output buffer will block until a buffer is available (up to 100 milliseconds).
+ // If this timeout is exceeded, the output thread will unblock and check if the decoder is still
+ // running. If it is, it will block on dequeue again. Otherwise, it will stop and release the
+ // MediaCodec.
+ private static final int DEQUEUE_OUTPUT_BUFFER_TIMEOUT_US = 100000;
+
+ private final String codecName;
+ private final VideoCodecType codecType;
+ private final Deque<Long> decodeStartTimes;
+ private int colorFormat;
+
+ // Output thread runs a loop which polls MediaCodec for decoded output buffers. It reformats
+ // those buffers into VideoFrames and delivers them to the callback.
+ private Thread outputThread;
+
+ // Checker that ensures work is run on the output thread.
+ private ThreadChecker outputThreadChecker;
+
+ // Checker that ensures work is run on the decoder thread. The decoder thread is owned by the
+ // caller and must be used to call initDecode, decode, and release.
+ private ThreadChecker decoderThreadChecker;
+
+ private volatile boolean running = false;
+ private volatile Exception shutdownException = null;
+
+ private CountDownLatch ouputDequeuedSignal;
+
+ // Dimensions (width, height, stride, and sliceHeight) may be accessed by either the decode thread
+ // or the output thread. Accesses should be protected with this lock.
+ private final Object dimensionLock = new Object();
+ private int width;
+ private int height;
+ private int stride;
+ private int sliceHeight;
+
+ // Whether the decoder has finished the first frame. The codec may not change output dimensions
+ // after delivering the first frame.
+ private boolean hasDecodedFirstFrame;
+ // Whether the decoder has seen a key frame. The first frame must be a key frame.
+ private boolean keyFrameRequired;
+
+ // Decoding proceeds asynchronously. This callback returns decoded frames to the caller.
+ private Callback callback;
+
+ private MediaCodec codec = null;
+
+ HardwareVideoDecoder(String codecName, VideoCodecType codecType, int colorFormat) {
+ if (!isSupportedColorFormat(colorFormat)) {
+ throw new IllegalArgumentException("Unsupported color format: " + colorFormat);
+ }
+ this.codecName = codecName;
+ this.codecType = codecType;
+ this.colorFormat = colorFormat;
+ this.decodeStartTimes = new LinkedBlockingDeque<>();
+ }
+
+ @Override
+ public VideoCodecStatus initDecode(Settings settings, Callback callback) {
+ this.decoderThreadChecker = new ThreadChecker();
+ return initDecodeInternal(settings.width, settings.height, callback);
+ }
+
+ private VideoCodecStatus initDecodeInternal(int width, int height, Callback callback) {
+ decoderThreadChecker.checkIsOnValidThread();
+ if (outputThread != null) {
+ Logging.e(TAG, "initDecodeInternal called while the codec is already running");
+ return VideoCodecStatus.ERROR;
+ }
+
+ // Note: it is not necessary to initialize dimensions under the lock, since the output thread
+ // is not running.
+ this.callback = callback;
+ this.width = width;
+ this.height = height;
+
+ stride = width;
+ sliceHeight = height;
+ hasDecodedFirstFrame = false;
+ keyFrameRequired = true;
+
+ try {
+ codec = MediaCodec.createByCodecName(codecName);
+ } catch (IOException | IllegalArgumentException e) {
+ Logging.e(TAG, "Cannot create media decoder");
+ return VideoCodecStatus.ERROR;
+ }
+ try {
+ MediaFormat format = MediaFormat.createVideoFormat(codecType.mimeType(), width, height);
+ format.setInteger(MediaFormat.KEY_COLOR_FORMAT, colorFormat);
+ codec.configure(format, null, null, 0);
+ codec.start();
+ } catch (IllegalStateException e) {
+ Logging.e(TAG, "initDecode failed", e);
+ release();
+ return VideoCodecStatus.ERROR;
+ }
+
+ running = true;
+ ouputDequeuedSignal = new CountDownLatch(1);
+ outputThread = createOutputThread();
+ outputThread.start();
+
+ return VideoCodecStatus.OK;
+ }
+
+ @Override
+ public VideoCodecStatus decode(EncodedImage frame, DecodeInfo info) {
+ decoderThreadChecker.checkIsOnValidThread();
+ if (codec == null || callback == null) {
+ return VideoCodecStatus.UNINITIALIZED;
+ }
+
+ if (frame.buffer == null) {
+ Logging.e(TAG, "decode() - no input data");
+ return VideoCodecStatus.ERR_PARAMETER;
+ }
+
+ int size = frame.buffer.remaining();
+ if (size == 0) {
+ Logging.e(TAG, "decode() - input buffer empty");
+ return VideoCodecStatus.ERR_PARAMETER;
+ }
+
+ // Load dimensions from shared memory under the dimension lock.
+ int width, height;
+ synchronized (dimensionLock) {
+ width = this.width;
+ height = this.height;
+ }
+
+ // Check if the resolution changed and reset the codec if necessary.
+ if (frame.encodedWidth * frame.encodedHeight > 0
+ && (frame.encodedWidth != width || frame.encodedHeight != height)) {
+ VideoCodecStatus status = reinitDecode(frame.encodedWidth, frame.encodedHeight);
+ if (status != VideoCodecStatus.OK) {
+ return VideoCodecStatus.FALLBACK_SOFTWARE;
+ }
+ }
+
+ if (keyFrameRequired) {
+ // Need to process a key frame first.
+ if (frame.frameType != EncodedImage.FrameType.VideoFrameKey) {
+ Logging.e(TAG, "decode() - key frame required first");
+ return VideoCodecStatus.ERROR;
+ }
+ if (!frame.completeFrame) {
+ Logging.e(TAG, "decode() - complete frame required first");
+ return VideoCodecStatus.ERROR;
+ }
+
+ // Wait for the output thread to dequeue a buffer containing format information. Otherwise,
+ // the decoder may drop the key frame and fail.
+ try {
+ ouputDequeuedSignal.await();
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+ return VideoCodecStatus.ERROR;
+ }
+ }
+
+ // TODO(mellem): Support textures.
+ int index;
+ try {
+ index = codec.dequeueInputBuffer(0 /* timeout */);
+ } catch (IllegalStateException e) {
+ Logging.e(TAG, "dequeueInputBuffer failed", e);
+ return VideoCodecStatus.ERROR;
+ }
+ if (index < 0) {
+ // Decoder is falling behind. No input buffers available.
+ // The decoder can't simply drop frames; it might lose a key frame.
+ Logging.e(TAG, "decode() - no HW buffers available; decoder falling behind");
+ return VideoCodecStatus.ERROR;
+ }
+
+ ByteBuffer buffer;
+ try {
+ buffer = codec.getInputBuffers()[index];
+ } catch (IllegalStateException e) {
+ Logging.e(TAG, "getInputBuffers failed", e);
+ return VideoCodecStatus.ERROR;
+ }
+
+ if (buffer.capacity() < size) {
+ Logging.e(TAG, "decode() - HW buffer too small");
+ return VideoCodecStatus.ERROR;
+ }
+ buffer.put(frame.buffer);
+
+ decodeStartTimes.offer(SystemClock.elapsedRealtime());
+ try {
+ codec.queueInputBuffer(
+ index, 0 /* offset */, size, frame.captureTimeMs * 1000, 0 /* flags */);
+ } catch (IllegalStateException e) {
+ Logging.e(TAG, "queueInputBuffer failed", e);
+ decodeStartTimes.pollLast();
+ return VideoCodecStatus.ERROR;
+ }
+ if (keyFrameRequired) {
+ keyFrameRequired = false;
+ }
+ return VideoCodecStatus.OK;
+ }
+
+ @Override
+ public boolean getPrefersLateDecoding() {
+ return true;
+ }
+
+ @Override
+ public String getImplementationName() {
+ return "HardwareVideoDecoder: " + codecName;
+ }
+
+ @Override
+ public VideoCodecStatus release() {
+ decoderThreadChecker.checkIsOnValidThread();
+ try {
+ // The outputThread actually stops and releases the codec once running is false.
+ running = false;
+ if (!ThreadUtils.joinUninterruptibly(outputThread, MEDIA_CODEC_RELEASE_TIMEOUT_MS)) {
+ // Log an exception to capture the stack trace and turn it into a TIMEOUT error.
+ Logging.e(TAG, "Media encoder release timeout", new RuntimeException());
+ return VideoCodecStatus.TIMEOUT;
+ }
+ if (shutdownException != null) {
+ // Log the exception and turn it into an error. Wrap the exception in a new exception to
+ // capture both the output thread's stack trace and this thread's stack trace.
+ Logging.e(TAG, "Media encoder release error", new RuntimeException(shutdownException));
+ shutdownException = null;
+ return VideoCodecStatus.ERROR;
+ }
+ } finally {
+ codec = null;
+ callback = null;
+ outputThread = null;
+ decodeStartTimes.clear();
+ }
+ return VideoCodecStatus.OK;
+ }
+
+ private VideoCodecStatus reinitDecode(int newWidth, int newHeight) {
+ decoderThreadChecker.checkIsOnValidThread();
+ VideoCodecStatus status = release();
+ if (status != VideoCodecStatus.OK) {
+ return status;
+ }
+ return initDecodeInternal(newWidth, newHeight, callback);
+ }
+
+ private Thread createOutputThread() {
+ return new Thread("HardwareVideoDecoder.outputThread") {
+ @Override
+ public void run() {
+ outputThreadChecker = new ThreadChecker();
+ while (running) {
+ deliverDecodedFrame();
+ }
+ releaseCodecOnOutputThread();
+ }
+ };
+ }
+
+ private void deliverDecodedFrame() {
+ outputThreadChecker.checkIsOnValidThread();
+ try {
+ MediaCodec.BufferInfo info = new MediaCodec.BufferInfo();
+ // Block until an output buffer is available (up to 100 milliseconds). If the timeout is
+ // exceeded, deliverDecodedFrame() will be called again on the next iteration of the output
+ // thread's loop. Blocking here prevents the output thread from busy-waiting while the codec
+ // is idle.
+ int result = codec.dequeueOutputBuffer(info, DEQUEUE_OUTPUT_BUFFER_TIMEOUT_US);
+ ouputDequeuedSignal.countDown();
+ if (result == MediaCodec.INFO_OUTPUT_FORMAT_CHANGED) {
+ reformat(codec.getOutputFormat());
+ return;
+ }
+
+ if (result < 0) {
+ Logging.v(TAG, "dequeueOutputBuffer returned " + result);
+ return;
+ }
+
+ Long decodeStartTimeMs = decodeStartTimes.poll();
+ Integer decodeTimeMs = null;
+ if (decodeStartTimeMs != null) {
+ decodeTimeMs = (int) (SystemClock.elapsedRealtime() - decodeStartTimeMs);
+ }
+
+ hasDecodedFirstFrame = true;
+
+ // Load dimensions from shared memory under the dimension lock.
+ int width, height, stride, sliceHeight;
+ synchronized (dimensionLock) {
+ width = this.width;
+ height = this.height;
+ stride = this.stride;
+ sliceHeight = this.sliceHeight;
+ }
+
+ // Output must be at least width * height bytes for Y channel, plus (width / 2) * (height / 2)
+ // bytes for each of the U and V channels.
+ if (info.size < width * height * 3 / 2) {
+ Logging.e(TAG, "Insufficient output buffer size: " + info.size);
+ return;
+ }
+
+ if (info.size < stride * height * 3 / 2 && sliceHeight == height && stride > width) {
+ // Some codecs (Exynos) report an incorrect stride. Correct it here.
+ // Expected size == stride * height * 3 / 2. A bit of algebra gives the correct stride as
+ // 2 * size / (3 * height).
+ stride = info.size * 2 / (height * 3);
+ }
+
+ ByteBuffer buffer = codec.getOutputBuffers()[result];
+ buffer.position(info.offset);
+ buffer.limit(info.size);
+
+ VideoFrame.I420Buffer frameBuffer = new I420BufferImpl(width, height);
+
+ // TODO(mellem): As an optimization, avoid copying data here. Wrap the output buffers into
+ // the frame buffer without copying or reformatting.
+ // TODO(mellem): As an optimization, use libyuv via JNI to copy/reformatting data.
+ if (colorFormat == CodecCapabilities.COLOR_FormatYUV420Planar) {
+ copyI420(buffer, info.offset, frameBuffer, stride, sliceHeight, width, height);
+ } else {
+ // All other supported color formats are NV12.
+ nv12ToI420(buffer, info.offset, frameBuffer, stride, sliceHeight, width, height);
+ }
+ codec.releaseOutputBuffer(result, false);
+
+ long presentationTimeNs = info.presentationTimeUs * 1000;
+ VideoFrame frame =
+ new VideoFrame(frameBuffer, 0 /* rotation */, presentationTimeNs, new Matrix());
+
+ // Note that qp is parsed on the C++ side.
+ callback.onDecodedFrame(frame, decodeTimeMs, null /* qp */);
+ frame.release();
+ } catch (IllegalStateException e) {
+ Logging.e(TAG, "deliverDecodedFrame failed", e);
+ }
+ }
+
+ private void reformat(MediaFormat format) {
+ outputThreadChecker.checkIsOnValidThread();
+ Logging.d(TAG, "Decoder format changed: " + format.toString());
+ final int newWidth;
+ final int newHeight;
+ if (format.containsKey(MEDIA_FORMAT_KEY_CROP_LEFT)
+ && format.containsKey(MEDIA_FORMAT_KEY_CROP_RIGHT)
+ && format.containsKey(MEDIA_FORMAT_KEY_CROP_BOTTOM)
+ && format.containsKey(MEDIA_FORMAT_KEY_CROP_TOP)) {
+ newWidth = 1 + format.getInteger(MEDIA_FORMAT_KEY_CROP_RIGHT)
+ - format.getInteger(MEDIA_FORMAT_KEY_CROP_LEFT);
+ newHeight = 1 + format.getInteger(MEDIA_FORMAT_KEY_CROP_BOTTOM)
+ - format.getInteger(MEDIA_FORMAT_KEY_CROP_TOP);
+ } else {
+ newWidth = format.getInteger(MediaFormat.KEY_WIDTH);
+ newHeight = format.getInteger(MediaFormat.KEY_HEIGHT);
+ }
+ // Compare to existing width, height, and save values under the dimension lock.
+ synchronized (dimensionLock) {
+ if (hasDecodedFirstFrame && (width != newWidth || height != newHeight)) {
+ stopOnOutputThread(new RuntimeException("Unexpected size change. Configured " + width + "*"
+ + height + ". New " + newWidth + "*" + newHeight));
+ return;
+ }
+ width = newWidth;
+ height = newHeight;
+ }
+
+ if (format.containsKey(MediaFormat.KEY_COLOR_FORMAT)) {
+ colorFormat = format.getInteger(MediaFormat.KEY_COLOR_FORMAT);
+ Logging.d(TAG, "Color: 0x" + Integer.toHexString(colorFormat));
+ if (!isSupportedColorFormat(colorFormat)) {
+ stopOnOutputThread(new IllegalStateException("Unsupported color format: " + colorFormat));
+ return;
+ }
+ }
+
+ // Save stride and sliceHeight under the dimension lock.
+ synchronized (dimensionLock) {
+ if (format.containsKey(MEDIA_FORMAT_KEY_STRIDE)) {
+ stride = format.getInteger(MEDIA_FORMAT_KEY_STRIDE);
+ }
+ if (format.containsKey(MEDIA_FORMAT_KEY_SLICE_HEIGHT)) {
+ sliceHeight = format.getInteger(MEDIA_FORMAT_KEY_SLICE_HEIGHT);
+ }
+ Logging.d(TAG, "Frame stride and slice height: " + stride + " x " + sliceHeight);
+ stride = Math.max(width, stride);
+ sliceHeight = Math.max(height, sliceHeight);
+ }
+ }
+
+ private void releaseCodecOnOutputThread() {
+ outputThreadChecker.checkIsOnValidThread();
+ Logging.d(TAG, "Releasing MediaCodec on output thread");
+ try {
+ codec.stop();
+ } catch (Exception e) {
+ Logging.e(TAG, "Media decoder stop failed", e);
+ }
+ try {
+ codec.release();
+ } catch (Exception e) {
+ Logging.e(TAG, "Media decoder release failed", e);
+ // Propagate exceptions caught during release back to the main thread.
+ shutdownException = e;
+ }
+ codec = null;
+ callback = null;
+ outputThread = null;
+ decodeStartTimes.clear();
+ Logging.d(TAG, "Release on output thread done");
+ }
+
+ private void stopOnOutputThread(Exception e) {
+ outputThreadChecker.checkIsOnValidThread();
+ running = false;
+ shutdownException = e;
+ }
+
+ private boolean isSupportedColorFormat(int colorFormat) {
+ switch (colorFormat) {
+ case CodecCapabilities.COLOR_FormatYUV420Planar:
+ case CodecCapabilities.COLOR_FormatYUV420SemiPlanar:
+ case CodecCapabilities.COLOR_QCOM_FormatYUV420SemiPlanar:
+ case COLOR_QCOM_FORMATYVU420PackedSemiPlanar32m4ka:
+ case COLOR_QCOM_FORMATYVU420PackedSemiPlanar16m4ka:
+ case COLOR_QCOM_FORMATYVU420PackedSemiPlanar64x32Tile2m8ka:
+ case COLOR_QCOM_FORMATYUV420PackedSemiPlanar32m:
+ return true;
+ default:
+ return false;
+ }
+ }
+
+ private static void copyI420(ByteBuffer src, int offset, VideoFrame.I420Buffer frameBuffer,
+ int stride, int sliceHeight, int width, int height) {
+ int uvStride = stride / 2;
+ int chromaWidth = (width + 1) / 2;
+ // Note that hardware truncates instead of rounding. WebRTC expects rounding, so the last
+ // row will be duplicated if the sliceHeight is odd.
+ int chromaHeight = (sliceHeight % 2 == 0) ? (height + 1) / 2 : height / 2;
+
+ int yPos = offset;
+ int uPos = yPos + stride * sliceHeight;
+ int vPos = uPos + uvStride * sliceHeight / 2;
+
+ copyPlane(
+ src, yPos, stride, frameBuffer.getDataY(), 0, frameBuffer.getStrideY(), width, height);
+ copyPlane(src, uPos, uvStride, frameBuffer.getDataU(), 0, frameBuffer.getStrideU(), chromaWidth,
+ chromaHeight);
+ copyPlane(src, vPos, uvStride, frameBuffer.getDataV(), 0, frameBuffer.getStrideV(), chromaWidth,
+ chromaHeight);
+
+ // If the sliceHeight is odd, duplicate the last rows of chroma. Copy the last row of the U and
+ // V channels and append them at the end of each channel.
+ if (sliceHeight % 2 != 0) {
+ int strideU = frameBuffer.getStrideU();
+ int endU = chromaHeight * strideU;
+ copyRow(frameBuffer.getDataU(), endU - strideU, frameBuffer.getDataU(), endU, chromaWidth);
+ int strideV = frameBuffer.getStrideV();
+ int endV = chromaHeight * strideV;
+ copyRow(frameBuffer.getDataV(), endV - strideV, frameBuffer.getDataV(), endV, chromaWidth);
+ }
+ }
+
+ private static void nv12ToI420(ByteBuffer src, int offset, VideoFrame.I420Buffer frameBuffer,
+ int stride, int sliceHeight, int width, int height) {
+ int yPos = offset;
+ int uvPos = yPos + stride * sliceHeight;
+ int chromaWidth = (width + 1) / 2;
+ int chromaHeight = (height + 1) / 2;
+
+ copyPlane(
+ src, yPos, stride, frameBuffer.getDataY(), 0, frameBuffer.getStrideY(), width, height);
+
+ // Split U and V rows.
+ int dstUPos = 0;
+ int dstVPos = 0;
+ for (int i = 0; i < chromaHeight; ++i) {
+ for (int j = 0; j < chromaWidth; ++j) {
+ frameBuffer.getDataU().put(dstUPos + j, src.get(uvPos + j * 2));
+ frameBuffer.getDataV().put(dstVPos + j, src.get(uvPos + j * 2 + 1));
+ }
+ dstUPos += frameBuffer.getStrideU();
+ dstVPos += frameBuffer.getStrideV();
+ uvPos += stride;
+ }
+ }
+
+ private static void copyPlane(ByteBuffer src, int srcPos, int srcStride, ByteBuffer dst,
+ int dstPos, int dstStride, int width, int height) {
+ for (int i = 0; i < height; ++i) {
+ copyRow(src, srcPos, dst, dstPos, width);
+ srcPos += srcStride;
+ dstPos += dstStride;
+ }
+ }
+
+ private static void copyRow(ByteBuffer src, int srcPos, ByteBuffer dst, int dstPos, int width) {
+ for (int i = 0; i < width; ++i) {
+ dst.put(dstPos + i, src.get(srcPos + i));
+ }
+ }
+}