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/*
* Copyright (C) 2018 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 org.mozilla.thirdparty.com.google.android.exoplayer2.video.spherical;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.BaseRenderer;
import org.mozilla.thirdparty.com.google.android.exoplayer2.C;
import org.mozilla.thirdparty.com.google.android.exoplayer2.ExoPlaybackException;
import org.mozilla.thirdparty.com.google.android.exoplayer2.Format;
import org.mozilla.thirdparty.com.google.android.exoplayer2.FormatHolder;
import org.mozilla.thirdparty.com.google.android.exoplayer2.Renderer;
import org.mozilla.thirdparty.com.google.android.exoplayer2.RendererCapabilities;
import org.mozilla.thirdparty.com.google.android.exoplayer2.decoder.DecoderInputBuffer;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.MimeTypes;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.ParsableByteArray;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Util;
import java.nio.ByteBuffer;
/** A {@link Renderer} that parses the camera motion track. */
public class CameraMotionRenderer extends BaseRenderer {
// The amount of time to read samples ahead of the current time.
private static final int SAMPLE_WINDOW_DURATION_US = 100000;
private final DecoderInputBuffer buffer;
private final ParsableByteArray scratch;
private long offsetUs;
@Nullable private CameraMotionListener listener;
private long lastTimestampUs;
public CameraMotionRenderer() {
super(C.TRACK_TYPE_CAMERA_MOTION);
buffer = new DecoderInputBuffer(DecoderInputBuffer.BUFFER_REPLACEMENT_MODE_NORMAL);
scratch = new ParsableByteArray();
}
@Override
@Capabilities
public int supportsFormat(Format format) {
return MimeTypes.APPLICATION_CAMERA_MOTION.equals(format.sampleMimeType)
? RendererCapabilities.create(FORMAT_HANDLED)
: RendererCapabilities.create(FORMAT_UNSUPPORTED_TYPE);
}
@Override
public void handleMessage(int messageType, @Nullable Object message) throws ExoPlaybackException {
if (messageType == C.MSG_SET_CAMERA_MOTION_LISTENER) {
listener = (CameraMotionListener) message;
} else {
super.handleMessage(messageType, message);
}
}
@Override
protected void onStreamChanged(Format[] formats, long offsetUs) throws ExoPlaybackException {
this.offsetUs = offsetUs;
}
@Override
protected void onPositionReset(long positionUs, boolean joining) throws ExoPlaybackException {
resetListener();
}
@Override
protected void onDisabled() {
resetListener();
}
@Override
public void render(long positionUs, long elapsedRealtimeUs) throws ExoPlaybackException {
// Keep reading available samples as long as the sample time is not too far into the future.
while (!hasReadStreamToEnd() && lastTimestampUs < positionUs + SAMPLE_WINDOW_DURATION_US) {
buffer.clear();
FormatHolder formatHolder = getFormatHolder();
int result = readSource(formatHolder, buffer, /* formatRequired= */ false);
if (result != C.RESULT_BUFFER_READ || buffer.isEndOfStream()) {
return;
}
buffer.flip();
lastTimestampUs = buffer.timeUs;
if (listener != null) {
float[] rotation = parseMetadata(Util.castNonNull(buffer.data));
if (rotation != null) {
Util.castNonNull(listener).onCameraMotion(lastTimestampUs - offsetUs, rotation);
}
}
}
}
@Override
public boolean isEnded() {
return hasReadStreamToEnd();
}
@Override
public boolean isReady() {
return true;
}
private @Nullable float[] parseMetadata(ByteBuffer data) {
if (data.remaining() != 16) {
return null;
}
scratch.reset(data.array(), data.limit());
scratch.setPosition(data.arrayOffset() + 4); // skip reserved bytes too.
float[] result = new float[3];
for (int i = 0; i < 3; i++) {
result[i] = Float.intBitsToFloat(scratch.readLittleEndianInt());
}
return result;
}
private void resetListener() {
lastTimestampUs = 0;
if (listener != null) {
listener.onCameraMotionReset();
}
}
}
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