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Blackberry: Fix resolution selection for video recording

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Fix the selection of the video viewfinder resolution depending
on the features provided by the camera. If the viewfinder is responsible
for encoding the video frames, the resolution of the viewfinder
and the video output must match. Otherwise only the ratio must match
and we can use a lower resolution for the viewfinder to improve
the performance of the NV12->RGB frame conversion.

Change-Id: I66ace84841a69be84f83bf9c5240cd23d96fbb76
Reviewed-by: Bernd Weimer <bweimer@rim.com>
Reviewed-by: Thomas McGuire <thomas.mcguire@kdab.com>
This commit is contained in:
Tobias Koenig
2013-02-12 10:26:55 +01:00
committed by The Qt Project
parent df2c324364
commit dbe69f38d0
3 changed files with 58 additions and 49 deletions
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102
src/plugins/blackberry/camera/bbcamerasession.cpp
View File

@@ -113,6 +113,7 @@ BbCameraSession::BbCameraSession(QObject *parent)
, m_state(QCamera::UnloadedState)
, m_captureMode(QCamera::CaptureStillImage)
, m_device("bb:RearCamera")
, m_previewIsVideo(true)
, m_surface(0)
, m_captureImageDriveMode(QCameraImageCapture::SingleImageCapture)
, m_lastImageCaptureId(0)
@@ -591,11 +592,51 @@ qint64 BbCameraSession::duration() const
return (m_videoRecordingDuration.isValid() ? m_videoRecordingDuration.elapsed() : 0);
}
void BbCameraSession::applySettings()
void BbCameraSession::applyVideoSettings()
{
if (m_handle == CAMERA_HANDLE_INVALID)
return;
// apply viewfinder configuration
const QList<QSize> videoOutputResolutions = supportedResolutions(QCamera::CaptureVideo);
if (!m_videoEncoderSettings.resolution().isValid() || !videoOutputResolutions.contains(m_videoEncoderSettings.resolution()))
m_videoEncoderSettings.setResolution(videoOutputResolutions.first());
QSize viewfinderResolution;
if (m_previewIsVideo) {
// The viewfinder is responsible for encoding the video frames, so the resolutions must match.
viewfinderResolution = m_videoEncoderSettings.resolution();
} else {
// The frames are encoded separately from the viewfinder, so only the aspect ratio must match.
const QSize videoResolution = m_videoEncoderSettings.resolution();
const qreal aspectRatio = static_cast<qreal>(videoResolution.width())/static_cast<qreal>(videoResolution.height());
QList<QSize> sizes = supportedViewfinderResolutions(QCamera::CaptureVideo);
std::reverse(sizes.begin(), sizes.end()); // use smallest possible resolution
foreach (const QSize &size, sizes) {
// search for viewfinder resolution with the same aspect ratio
if (qFuzzyCompare(aspectRatio, (static_cast<qreal>(size.width())/static_cast<qreal>(size.height())))) {
viewfinderResolution = size;
break;
}
}
}
Q_ASSERT(viewfinderResolution.isValid());
camera_error_t result = CAMERA_EOK;
result = camera_set_videovf_property(m_handle,
CAMERA_IMGPROP_WIDTH, viewfinderResolution.width(),
CAMERA_IMGPROP_HEIGHT, viewfinderResolution.height(),
CAMERA_IMGPROP_ROTATION, 360 - m_nativeCameraOrientation);
if (result != CAMERA_EOK) {
qWarning() << "Unable to apply video viewfinder settings:" << result;
return;
}
QString videoCodec = m_videoEncoderSettings.codec();
if (videoCodec.isEmpty())
videoCodec = QLatin1String("h264");
@@ -608,14 +649,8 @@ void BbCameraSession::applySettings()
else if (videoCodec == QLatin1String("h264"))
cameraVideoCodec = CAMERA_VIDEOCODEC_H264;
QSize resolution = m_videoEncoderSettings.resolution();
if (!resolution.isValid()) {
const QList<QSize> resolutions = supportedResolutions(QCamera::CaptureVideo);
if (!resolutions.isEmpty())
resolution = resolutions.first();
}
const QSize resolution = m_videoEncoderSettings.resolution();
//TODO: how to retrieve the supported video framerates from BB10 API?
qreal frameRate = m_videoEncoderSettings.frameRate();
if (frameRate == 0) {
const QList<qreal> frameRates = supportedFrameRates(QVideoEncoderSettings(), 0);
@@ -635,11 +670,11 @@ void BbCameraSession::applySettings()
else if (audioCodec == QLatin1String("raw"))
cameraAudioCodec = CAMERA_AUDIOCODEC_RAW;
const camera_error_t result = camera_set_video_property(m_handle,
CAMERA_IMGPROP_WIDTH, resolution.width(),
CAMERA_IMGPROP_HEIGHT, resolution.height(),
CAMERA_IMGPROP_VIDEOCODEC, cameraVideoCodec,
CAMERA_IMGPROP_AUDIOCODEC, cameraAudioCodec);
result = camera_set_video_property(m_handle,
CAMERA_IMGPROP_WIDTH, resolution.width(),
CAMERA_IMGPROP_HEIGHT, resolution.height(),
CAMERA_IMGPROP_VIDEOCODEC, cameraVideoCodec,
CAMERA_IMGPROP_AUDIOCODEC, cameraAudioCodec);
if (result != CAMERA_EOK) {
qWarning() << "Unable to apply video settings:" << result;
@@ -668,7 +703,10 @@ QList<qreal> BbCameraSession::supportedFrameRates(const QVideoEncoderSettings &s
double rates[20];
bool maxmin = false;
//TODO: actually we want to retrieve the framerates of the video here, not the viewfinder
/**
* Since in current version of the BB10 platform the video viewfinder encodes the video frames, we use
* the values as returned by camera_get_video_vf_framerates().
*/
const camera_error_t result = camera_get_video_vf_framerates(m_handle, 20, &supported, rates, &maxmin);
if (result != CAMERA_EOK) {
qWarning() << "Unable to retrieve supported viewfinder framerates:" << result;
@@ -977,6 +1015,8 @@ bool BbCameraSession::openCamera()
return false;
}
m_previewIsVideo = camera_has_feature(m_handle, CAMERA_FEATURE_PREVIEWISVIDEO);
m_status = QCamera::LoadedStatus;
emit statusChanged(m_status);
@@ -1192,39 +1232,7 @@ void BbCameraSession::applyConfiguration()
}
} else if (m_captureMode & QCamera::CaptureVideo) {
const QList<QSize> videoOutputResolutions = supportedResolutions(QCamera::CaptureVideo);
if (!m_videoEncoderSettings.resolution().isValid() || !videoOutputResolutions.contains(m_videoEncoderSettings.resolution()))
m_videoEncoderSettings.setResolution(videoOutputResolutions.first());
const QSize videoResolution = m_videoEncoderSettings.resolution();
const qreal aspectRatio = static_cast<qreal>(videoResolution.width())/static_cast<qreal>(videoResolution.height());
// apply viewfinder configuration
QSize viewfinderResolution;
QList<QSize> sizes = supportedViewfinderResolutions(QCamera::CaptureVideo);
std::reverse(sizes.begin(), sizes.end()); // use smallest possible resolution
foreach (const QSize &size, sizes) {
// search for viewfinder resolution with the same aspect ratio
if (qFuzzyCompare(aspectRatio, (static_cast<qreal>(size.width())/static_cast<qreal>(size.height())))) {
viewfinderResolution = size;
break;
}
}
Q_ASSERT(viewfinderResolution.isValid());
const camera_error_t result = camera_set_videovf_property(m_handle,
CAMERA_IMGPROP_WIDTH, viewfinderResolution.width(),
CAMERA_IMGPROP_HEIGHT, viewfinderResolution.height(),
CAMERA_IMGPROP_ROTATION, 360 - m_nativeCameraOrientation);
if (result != CAMERA_EOK) {
qWarning() << "Unable to apply video viewfinder settings:" << result;
return;
}
applySettings();
applyVideoSettings();
}
}