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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qandroidcameraframe_p.h"
#include <jni.h>
#include <QDebug>
#include <QtCore/qjnitypes.h>
#include <QtCore/QLoggingCategory>
Q_DECLARE_JNI_CLASS(AndroidImageFormat, "android/graphics/ImageFormat");
Q_DECLARE_JNI_CLASS(AndroidImage, "android/media/Image")
Q_DECLARE_JNI_TYPE(AndroidImagePlaneArray, "[Landroid/media/Image$Plane;")
Q_DECLARE_JNI_CLASS(JavaByteBuffer, "java/nio/ByteBuffer")
QT_BEGIN_NAMESPACE
static Q_LOGGING_CATEGORY(qLCAndroidCameraFrame, "qt.multimedia.ffmpeg.android.camera.frame");
bool QAndroidCameraFrame::parse(const QJniObject &frame)
{
QJniEnvironment jniEnv;
if (!frame.isValid())
return false;
auto planes = frame.callMethod<QtJniTypes::AndroidImagePlaneArray>("getPlanes");
if (!planes.isValid())
return false;
int numberPlanes = jniEnv->GetArrayLength(planes.object<jarray>());
// create and populate temporary array structure
int pixelStrides[numberPlanes];
int rowStrides[numberPlanes];
int bufferSize[numberPlanes];
uint8_t *buffer[numberPlanes];
auto resetPlane = [&](int index) {
if (index < 0 || index > numberPlanes)
return;
rowStrides[index] = 0;
pixelStrides[index] = 0;
bufferSize[index] = 0;
buffer[index] = nullptr;
};
for (int index = 0; index < numberPlanes; index++) {
QJniObject plane = jniEnv->GetObjectArrayElement(planes.object<jobjectArray>(), index);
if (jniEnv.checkAndClearExceptions() || !plane.isValid()) {
resetPlane(index);
continue;
}
rowStrides[index] = plane.callMethod<jint>("getRowStride");
pixelStrides[index] = plane.callMethod<jint>("getPixelStride");
auto byteBuffer = plane.callMethod<QtJniTypes::JavaByteBuffer>("getBuffer");
if (!byteBuffer.isValid()) {
resetPlane(index);
continue;
}
// Uses direct access which is garanteed by android to work with
// ImageReader bytebuffer
buffer[index] = static_cast<uint8_t *>(jniEnv->GetDirectBufferAddress(byteBuffer.object()));
bufferSize[index] = byteBuffer.callMethod<jint>("remaining");
}
QVideoFrameFormat::PixelFormat calculedPixelFormat = QVideoFrameFormat::Format_Invalid;
// finding the image format
// the ImageFormats that can happen here are stated here:
// https://developer.android.com/reference/android/media/Image#getFormat()
int format = frame.callMethod<jint>("getFormat");
AndroidImageFormat imageFormat = AndroidImageFormat(format);
switch (imageFormat) {
case AndroidImageFormat::JPEG:
calculedPixelFormat = QVideoFrameFormat::Format_Jpeg;
break;
case AndroidImageFormat::YUV_420_888:
if (numberPlanes < 3) {
// something went wrong on parsing. YUV_420_888 format must always have 3 planes
calculedPixelFormat = QVideoFrameFormat::Format_Invalid;
break;
}
if (pixelStrides[1] == 1)
calculedPixelFormat = QVideoFrameFormat::Format_YUV420P;
else if (pixelStrides[1] == 2 && abs(buffer[1] - buffer[2]) == 1)
// this can be NV21, but it will converted below
calculedPixelFormat = QVideoFrameFormat::Format_NV12;
break;
case AndroidImageFormat::HEIC:
// QImage cannot parse HEIC
calculedPixelFormat = QVideoFrameFormat::Format_Invalid;
break;
case AndroidImageFormat::RAW_PRIVATE:
case AndroidImageFormat::RAW_SENSOR:
// we cannot know raw formats
calculedPixelFormat = QVideoFrameFormat::Format_Invalid;
break;
case AndroidImageFormat::FLEX_RGBA_8888:
case AndroidImageFormat::FLEX_RGB_888:
// these formats are only returned by Mediacodec.getOutputImage, they are not used as a
// Camera2 Image frame return
calculedPixelFormat = QVideoFrameFormat::Format_Invalid;
break;
case AndroidImageFormat::YUV_422_888:
case AndroidImageFormat::YUV_444_888:
case AndroidImageFormat::YCBCR_P010:
// not dealing with these formats, they require higher API levels than the current Qt min
calculedPixelFormat = QVideoFrameFormat::Format_Invalid;
break;
default:
calculedPixelFormat = QVideoFrameFormat::Format_Invalid;
break;
}
if (calculedPixelFormat == QVideoFrameFormat::Format_Invalid) {
qCWarning(qLCAndroidCameraFrame) << "Cannot determine image format!";
return false;
}
auto copyPlane = [&](int mapIndex, int arrayIndex) {
if (arrayIndex >= numberPlanes)
return;
m_planes[mapIndex].rowStride = rowStrides[arrayIndex];
m_planes[mapIndex].size = bufferSize[arrayIndex];
m_planes[mapIndex].data = buffer[arrayIndex];
};
switch (calculedPixelFormat) {
case QVideoFrameFormat::Format_YUV420P:
m_numberPlanes = 3;
copyPlane(0, 0);
copyPlane(1, 1);
copyPlane(2, 2);
m_pixelFormat = QVideoFrameFormat::Format_YUV420P;
break;
case QVideoFrameFormat::Format_NV12:
m_numberPlanes = 2;
copyPlane(0, 0);
copyPlane(1, 1);
m_pixelFormat = QVideoFrameFormat::Format_NV12;
break;
case QVideoFrameFormat::Format_Jpeg:
qCWarning(qLCAndroidCameraFrame)
<< "FFmpeg HW Mediacodec does not encode other than YCbCr formats";
// we still parse it to preview the frame
m_image = QImage::fromData(buffer[0], bufferSize[0]);
m_planes[0].rowStride = m_image.bytesPerLine();
m_planes[0].size = m_image.sizeInBytes();
m_planes[0].data = m_image.bits();
m_pixelFormat = QVideoFrameFormat::pixelFormatFromImageFormat(m_image.format());
break;
default:
break;
}
long timestamp = frame.callMethod<jlong>("getTimestamp");
m_timestamp = timestamp / 1000;
int width = frame.callMethod<jint>("getWidth");
int height = frame.callMethod<jint>("getHeight");
m_size = QSize(width, height);
return true;
}
QAndroidCameraFrame::QAndroidCameraFrame(QJniObject frame)
: m_pixelFormat(QVideoFrameFormat::Format_Invalid), m_parsed(parse(frame))
{
if (isParsed()) {
// holding the frame java object
QJniEnvironment jniEnv;
m_frame = jniEnv->NewGlobalRef(frame.object());
jniEnv.checkAndClearExceptions();
} else if (frame.isValid()) {
frame.callMethod<void>("close");
}
}
QAndroidCameraFrame::~QAndroidCameraFrame()
{
if (!isParsed()) // nothing to clean
return;
QJniObject qFrame(m_frame);
if (qFrame.isValid())
qFrame.callMethod<void>("close");
QJniEnvironment jniEnv;
if (m_frame)
jniEnv->DeleteGlobalRef(m_frame);
}
QT_END_NAMESPACE
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