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Tweaks to the win32 camera capture code to reduce CPU load.

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This commit is contained in:
Julian Storer 2010-10-18 21:03:17 +01:00
parent b80bb4bf38
commit ea16741b3d
8 changed files with 308 additions and 342 deletions
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64
src/native/windows/juce_win32_CameraDevice.cpp
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@ -45,7 +45,8 @@ public:
width (0),
height (0),
activeUsers (0),
recordNextFrameTime (false)
recordNextFrameTime (false),
previewMaxFPS (60)
{
HRESULT hr = graphBuilder.CoCreateInstance (CLSID_FilterGraph);
if (FAILED (hr))
@ -176,6 +177,11 @@ public:
mediaControl->Stop();
}
int getPreviewMaxFPS() const
{
return previewMaxFPS;
}
void handleFrame (double /*time*/, BYTE* buffer, long /*bufferSize*/)
{
if (recordNextFrameTime)
@ -246,13 +252,14 @@ public:
g.drawImage (activeImage, rx, ry, rw, rh, 0, 0, width, height);
}
bool createFileCaptureFilter (const File& file)
bool createFileCaptureFilter (const File& file, int quality)
{
removeFileCaptureFilter();
file.deleteFile();
mediaControl->Stop();
firstRecordedTime = Time();
recordNextFrameTime = true;
previewMaxFPS = 60;
HRESULT hr = asfWriter.CoCreateInstance (CLSID_WMAsfWriter);
@ -278,17 +285,30 @@ public:
hr = WMCreateProfileManager (profileManager.resetAndGetPointerAddress());
// This gibberish is the DirectShow profile for a video-only wmv file.
String prof ("<profile version=\"589824\" storageformat=\"1\" name=\"Quality\" description=\"Quality type for output.\"><streamconfig "
"majortype=\"{73646976-0000-0010-8000-00AA00389B71}\" streamnumber=\"1\" streamname=\"Video Stream\" inputname=\"Video409\" bitrate=\"894960\" "
"bufferwindow=\"0\" reliabletransport=\"1\" decodercomplexity=\"AU\" rfc1766langid=\"en-us\"><videomediaprops maxkeyframespacing=\"50000000\" quality=\"90\"/>"
"<wmmediatype subtype=\"{33564D57-0000-0010-8000-00AA00389B71}\" bfixedsizesamples=\"0\" btemporalcompression=\"1\" lsamplesize=\"0\"> <videoinfoheader "
"dwbitrate=\"894960\" dwbiterrorrate=\"0\" avgtimeperframe=\"100000\"><rcsource left=\"0\" top=\"0\" right=\"$WIDTH\" bottom=\"$HEIGHT\"/> <rctarget "
"left=\"0\" top=\"0\" right=\"$WIDTH\" bottom=\"$HEIGHT\"/> <bitmapinfoheader biwidth=\"$WIDTH\" biheight=\"$HEIGHT\" biplanes=\"1\" bibitcount=\"24\" "
"bicompression=\"WMV3\" bisizeimage=\"0\" bixpelspermeter=\"0\" biypelspermeter=\"0\" biclrused=\"0\" biclrimportant=\"0\"/> "
"</videoinfoheader></wmmediatype></streamconfig></profile>");
String prof ("<profile version=\"589824\" storageformat=\"1\" name=\"Quality\" description=\"Quality type for output.\">"
" <streamconfig majortype=\"{73646976-0000-0010-8000-00AA00389B71}\" streamnumber=\"1\""
" streamname=\"Video Stream\" inputname=\"Video409\" bitrate=\"894960\""
" bufferwindow=\"0\" reliabletransport=\"1\" decodercomplexity=\"AU\" rfc1766langid=\"en-us\">"
" <videomediaprops maxkeyframespacing=\"50000000\" quality=\"90\"/>"
" <wmmediatype subtype=\"{33564D57-0000-0010-8000-00AA00389B71}\" bfixedsizesamples=\"0\""
" btemporalcompression=\"1\" lsamplesize=\"0\">"
" <videoinfoheader dwbitrate=\"894960\" dwbiterrorrate=\"0\" avgtimeperframe=\"$AVGTIMEPERFRAME\">"
" <rcsource left=\"0\" top=\"0\" right=\"$WIDTH\" bottom=\"$HEIGHT\"/>"
" <rctarget left=\"0\" top=\"0\" right=\"$WIDTH\" bottom=\"$HEIGHT\"/>"
" <bitmapinfoheader biwidth=\"$WIDTH\" biheight=\"$HEIGHT\" biplanes=\"1\" bibitcount=\"24\""
" bicompression=\"WMV3\" bisizeimage=\"0\" bixpelspermeter=\"0\" biypelspermeter=\"0\""
" biclrused=\"0\" biclrimportant=\"0\"/>"
" </videoinfoheader>"
" </wmmediatype>"
" </streamconfig>"
"</profile>");
const int fps[] = { 10, 15, 30 };
const int maxFramesPerSecond = fps [quality % numElementsInArray (fps)];
prof = prof.replace ("$WIDTH", String (width))
.replace ("$HEIGHT", String (height));
.replace ("$HEIGHT", String (height))
.replace ("$AVGTIMEPERFRAME", String (10000000 / maxFramesPerSecond));
ComSmartPtr <IWMProfile> currentProfile;
hr = profileManager->LoadProfileByData ((const WCHAR*) prof, currentProfile.resetAndGetPointerAddress());
@ -306,6 +326,7 @@ public:
&& ok && activeUsers > 0
&& SUCCEEDED (mediaControl->Run()))
{
previewMaxFPS = (quality < 2) ? 15 : 25; // throttle back the preview comps to try to leave the cpu free for encoding
return true;
}
}
@ -335,6 +356,8 @@ public:
if (ok && activeUsers > 0)
mediaControl->Run();
previewMaxFPS = 60;
}
//==============================================================================
@ -377,7 +400,7 @@ public:
{
public:
DShowCaptureViewerComp (DShowCameraDeviceInteral* const owner_)
: owner (owner_)
: owner (owner_), maxFPS (15), lastRepaintTime (0)
{
setOpaque (true);
owner->addChangeListener (this);
@ -414,11 +437,22 @@ public:
void changeListenerCallback (void*)
{
repaint();
const int64 now = Time::currentTimeMillis();
if (now >= lastRepaintTime + (1000 / maxFPS))
{
lastRepaintTime = now;
repaint();
if (owner != 0)
maxFPS = owner->getPreviewMaxFPS();
}
}
private:
DShowCameraDeviceInteral* owner;
int maxFPS;
int64 lastRepaintTime;
};
//==============================================================================
@ -449,6 +483,7 @@ private:
Image activeImage;
bool recordNextFrameTime;
int previewMaxFPS;
void getVideoSizes (IAMStreamConfig* const streamConfig)
{
@ -681,11 +716,12 @@ const String CameraDevice::getFileExtension()
void CameraDevice::startRecordingToFile (const File& file, int quality)
{
jassert (quality >= 0 && quality <= 2);
stopRecording();
DShowCameraDeviceInteral* const d = (DShowCameraDeviceInteral*) internal;
d->addUser();
isRecording = d->createFileCaptureFilter (file);
isRecording = d->createFileCaptureFilter (file, quality);
}
const Time CameraDevice::getTimeOfFirstRecordedFrame() const