Custom byteArray data to WebRTC videoTrack

[sumitatflo]

I need to send specific cropped(face) video to the VideoTrack. I was able manipulate Camera1Session class of WebRTC to get the face cropped. Right now I am setting it to an ImageView.
My listenForBytebufferFrames() of Camera1Session.java:

private void listenForBytebufferFrames() {
    this.camera.setPreviewCallbackWithBuffer(new PreviewCallback() {
        public void onPreviewFrame(byte[] data, Camera callbackCamera) {
            Camera1Session.this.checkIsOnCameraThread();
            if(callbackCamera != Camera1Session.this.camera) {
                Logging.e("Camera1Session", "Callback from a different camera. This should never happen.");
            } else if(Camera1Session.this.state != Camera1Session.SessionState.RUNNING) {
                Logging.d("Camera1Session", "Bytebuffer frame captured but camera is no longer running.");
            } else {
                mFrameProcessor.setNextFrame(data, callbackCamera);
                long captureTimeNs = TimeUnit.MILLISECONDS.toNanos(SystemClock.elapsedRealtime());
                if(!Camera1Session.this.firstFrameReported) {
                    int startTimeMs = (int)TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - Camera1Session.this.constructionTimeNs);
                    Camera1Session.camera1StartTimeMsHistogram.addSample(startTimeMs);
                    Camera1Session.this.firstFrameReported = true;
                }

            ByteBuffer byteBuffer1 = ByteBuffer.wrap(data);
            Frame outputFrame = new Frame.Builder()
                    .setImageData(byteBuffer1,
                            Camera1Session.this.captureFormat.width,
                            Camera1Session.this.captureFormat.height,
                            ImageFormat.NV21)
                    .setTimestampMillis(mFrameProcessor.mPendingTimeMillis)
                    .setId(mFrameProcessor.mPendingFrameId)
                    .setRotation(3)
                    .build();
            int w = outputFrame.getMetadata().getWidth();
            int h = outputFrame.getMetadata().getHeight();
            SparseArray<Face> detectedFaces = mDetector.detect(outputFrame);
            if (detectedFaces.size() > 0) {

                Face face = detectedFaces.valueAt(0);
                ByteBuffer byteBufferRaw = outputFrame.getGrayscaleImageData();
                byte[] byteBuffer = byteBufferRaw.array();
                YuvImage yuvimage  = new YuvImage(byteBuffer, ImageFormat.NV21, w, h, null);
                ByteArrayOutputStream baos = new ByteArrayOutputStream();

                //My crop logic to get face co-ordinates

                yuvimage.compressToJpeg(new Rect(left, top, right, bottom), 80, baos);
                final byte[] jpegArray = baos.toByteArray();
                Bitmap bitmap = BitmapFactory.decodeByteArray(jpegArray, 0, jpegArray.length);

                Activity currentActivity = getActivity();
                if (currentActivity instanceof CallActivity) {
                    ((CallActivity) currentActivity).setBitmapToImageView(bitmap); //face on ImageView is set just fine
                }
                Camera1Session.this.events.onByteBufferFrameCaptured(Camera1Session.this, data, Camera1Session.this.captureFormat.width, Camera1Session.this.captureFormat.height, Camera1Session.this.getFrameOrientation(), captureTimeNs);
                Camera1Session.this.camera.addCallbackBuffer(data);
            } else {
                Camera1Session.this.events.onByteBufferFrameCaptured(Camera1Session.this, data, Camera1Session.this.captureFormat.width, Camera1Session.this.captureFormat.height, Camera1Session.this.getFrameOrientation(), captureTimeNs);
                Camera1Session.this.camera.addCallbackBuffer(data);
            }

        }
    }
});}

jpegArray is the final byteArray that I need to stream via WebRTC, which I tried with something like this:

Camera1Session.this.events.onByteBufferFrameCaptured(Camera1Session.this, jpegArray, (int) face.getWidth(), (int) face.getHeight(), Camera1Session.this.getFrameOrientation(), captureTimeNs);

Camera1Session.this.camera.addCallbackBuffer(jpegArray);

Setting them up like this gives me following error:

../../webrtc/sdk/android/src/jni/androidvideotracksource.cc line 82
Check failed: length >= width * height + 2 * uv_width * ((height + 1) / 2) (2630 vs. 460800)

Which I assume is because androidvideotracksource does not get the same length of byteArray that it expects, since the frame is cropped now. Could someone point me in the direction of how to achieve it? Is this the correct way/place to manipulate the data and feed into the videoTrack?