From f783c48a170c8ec86e4904b786a46dae5f07dfa7 Mon Sep 17 00:00:00 2001
From: Yoann Lopes <yoann.lopes@digia.com>
Date: Mon, 3 Feb 2014 21:38:56 +0100
Subject: VideoOutput: fix autoOrientation with a camera source.

Don't assume the camera frames are always in the same orientation as the
display in its primary orientation. We now take into account the camera
sensor position and orientation to calculate the viewport orientation.

Change-Id: Ib333c87f1804d1010ada42cb757e4fab78d75a04
Reviewed-by: Christian Stromme <christian.stromme@digia.com>
---
 .../qdeclarativevideooutput_p.h                    |  2 ++
 .../video/qvideooutputorientationhandler.cpp       |  2 +-
 .../qdeclarativevideooutput.cpp                    | 26 +++++++++++++++++++++-
 3 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/src/multimedia/qtmultimediaquicktools_headers/qdeclarativevideooutput_p.h b/src/multimedia/qtmultimediaquicktools_headers/qdeclarativevideooutput_p.h
index 2ca7c293..cc939b23 100644
--- a/src/multimedia/qtmultimediaquicktools_headers/qdeclarativevideooutput_p.h
+++ b/src/multimedia/qtmultimediaquicktools_headers/qdeclarativevideooutput_p.h
@@ -47,6 +47,7 @@
 #include <QtCore/qsharedpointer.h>
 #include <QtQuick/qquickitem.h>
 #include <QtCore/qpointer.h>
+#include <QtMultimedia/qcamerainfo.h>
 
 #include <private/qtmultimediaquickdefs_p.h>
 
@@ -138,6 +139,7 @@ private:
     QPointer<QObject> m_source;
     QPointer<QMediaObject> m_mediaObject;
     QPointer<QMediaService> m_service;
+    QCameraInfo m_cameraInfo;
 
     FillMode m_fillMode;
     QSize m_nativeSize;
diff --git a/src/multimedia/video/qvideooutputorientationhandler.cpp b/src/multimedia/video/qvideooutputorientationhandler.cpp
index 4c966c02..06fcb0c6 100644
--- a/src/multimedia/video/qvideooutputorientationhandler.cpp
+++ b/src/multimedia/video/qvideooutputorientationhandler.cpp
@@ -73,7 +73,7 @@ void QVideoOutputOrientationHandler::screenOrientationChanged(Qt::ScreenOrientat
     const QScreen *screen = QGuiApplication::primaryScreen();
     const QPlatformScreen *platformScreen = screen->handle();
 
-    const int angle = (360 - screen->angleBetween(platformScreen->nativeOrientation(), orientation));
+    const int angle = (360 - screen->angleBetween(platformScreen->nativeOrientation(), orientation)) % 360;
 
     if (angle == m_currentOrientation)
         return;
diff --git a/src/qtmultimediaquicktools/qdeclarativevideooutput.cpp b/src/qtmultimediaquicktools/qdeclarativevideooutput.cpp
index a04b38ce..5d2c57db 100644
--- a/src/qtmultimediaquicktools/qdeclarativevideooutput.cpp
+++ b/src/qtmultimediaquicktools/qdeclarativevideooutput.cpp
@@ -273,12 +273,22 @@ void QDeclarativeVideoOutput::_q_updateMediaObject()
 
     m_mediaObject.clear();
     m_service.clear();
+    m_cameraInfo = QCameraInfo();
 
     if (mediaObject) {
         if (QMediaService *service = mediaObject->service()) {
             if (createBackend(service)) {
                 m_service = service;
                 m_mediaObject = mediaObject;
+                const QCamera *camera = qobject_cast<const QCamera *>(mediaObject);
+                if (camera) {
+                    m_cameraInfo = QCameraInfo(*camera);
+
+                    // The camera position and orientation need to be taken into account for
+                    // the viewport auto orientation
+                    if (m_autoOrientation)
+                        _q_screenOrientationChanged(m_screenOrientationHandler->currentOrientation());
+                }
             }
         }
     }
@@ -375,7 +385,21 @@ void QDeclarativeVideoOutput::_q_updateGeometry()
 
 void QDeclarativeVideoOutput::_q_screenOrientationChanged(int orientation)
 {
-    setOrientation(orientation);
+    // If the source is a camera, take into account its sensor position and orientation
+    if (!m_cameraInfo.isNull()) {
+        switch (m_cameraInfo.position()) {
+        case QCamera::FrontFace:
+            // Front facing cameras are flipped horizontally, compensate the mirror
+            orientation += (360 - m_cameraInfo.orientation());
+            break;
+        case QCamera::BackFace:
+        default:
+            orientation += m_cameraInfo.orientation();
+            break;
+        }
+    }
+
+    setOrientation(orientation % 360);
 }
 
 /*!
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