/usr/share/psychtoolbox-3/PsychDemos/VideoMultiCameraCaptureDemo.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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% Demonstrate simple use of built-in video capture engine.
%
% VideoMultiCameraCaptureDemo([deviceIds=all][, syncmode=0][, movieName])
%
% VideoMultiCameraCaptureDemo captures simultaneously from all cameras
% connected to your computer, or a subset of cameras if it is specified
% in the optional vector 'deviceIds', and then shows their video feeds
% in individual Psychtoolbox windows.
%
% The optional 'syncmode' flag allows to select synchronization strategy
% for multi-cam capture: 0 = None, all free-running. 4 = Software sync,
% 8 = Firewire Bus-Sync, 16 = Hardware (TTL) trigger sync.
%
% The optional 'movieName' string, if provided, will enable video recording
% of each cameras video into a dedicated movie file, which consists of the
% movieName and a unique camera number.
%
% By default, a capture rate of 30 frames per second at a resolution of
% 640 x 480 pixels is requested, and the timecode and interframe interval
% of each captured image is displayed in the top-left corner of each window.
% A press of the ESCape key ends the demo. The demo also ends automatically
% after a timeout of 10 minutes is reached.
%
% This demo has various hard-coded parameters which allow you to tinker with
% things like Bayer filtering on the camera, versus on the host cpu, versus
% offline later on during playback of recorded video, to select different
% tradeoffs between quality, cpu load, speed and bus bandwidth use. It also
% allows to play with high bit depth (> 8 bpc) color and luminance formats,
% lossless video recording and other bits and pieces. Change the variables
% as you see fit and read the source carefully.
%
% History:
% 04-Nov-2013 mk Written.
if IsWin
error('Sorry, this demo is not supported on MS-Windows, as it needs the DC1394 video capture engine.');
end
% Default init and setup:
PsychDefaultSetup(2);
escape = KbName('ESCAPE');
backKey = KbName('LeftArrow');
forwardKey = KbName('RightArrow');
if nargin < 1
deviceIds=[];
end
if nargin < 2 || isempty(syncmode)
syncmode = 0;
else
if ~ismember(syncmode, [0,4,8,16])
error('Invalid syncmode! Must be 0, 4, 8 or 16!');
end
end
if nargin < 3 || isempty(movieName)
doVideoRecording = 0;
else
doVideoRecording = 1;
end
roi = [0 0 640 480];
depth = 3; % Choose a color depth of 1 if you want raw sensor data - or grayscale of course. 3 for RGB.
% Mode 4 would be the correct mode for raw sensor -> rgb bayer conversion on Basler cameras.
% Mode 3 would pass raw sensor data instead.
convMode = 4;
bayerPattern = 0; % This would be the correct bayer pattern for Basler color cameras.
debayerMethod = 3; % Debayer algorithm: 0 = Fastest, ..., 3 = High quality, 4-7 = May or may not work.
% Bitdepth to request from camera: 8 bpc is standard. 16 bpc requests anything between 9 bpc and 16 bpc:
bitdepth = 8;
% Set dropframes = 0 if multiple frames shall be recorded for sync timing checks, 1 otherwise:
dropframes = 1;
% Flags to use for video recording. 16 = Use multi-threaded recording.
if doVideoRecording
captureFlags = 16;
codec = ':CodecType=DEFAULTencoder UseVFR'; % Use default codec. UseVFR for variable framerate recording.
% The huffyuv and ffenc_sgi codecs are lossless codecs. They use lossless compression, so video images
% are stored exactly, but the resulting movie files will be comparably large!
% These are mostly useful if you want to use the material for sensitive computer vision algorithms,
% or if you want to store raw camera sensor data without Bayer filtering and perform the Bayer filtering
% for raw sensor -> RGB conversion later on during playback. In that case you will need exact storage of
% video and hence one of these codecs.
%codec = ':CodecType=huffyuv UseVFR'; % Use HuffYUV Huffman encoded lossless codec. UseVFR for variable framerate recording.
%codec = ':CodecType=ffenc_sgi UseVFR'; % Use SGI-RLE lossless codec. UseVFR for variable framerate recording.
% For > 8 bpc recording, we need to use our own proprietary video encoding:
% Note: Only use with lossless video codecs makes sense for 16 bpc mode.
% Currently supported are huffyuv and ffenc_sgi.
if bitdepth > 8
codec = [codec ' UsePTB16BPC'];
end
else
captureFlags = 16;
codec = [];
end
% Optional processing string for dropframes = 0 && captureFlags & 16 capture/recording:
processingString = '';
% Example processingString to apply an image warping effect:
%processingString = 'ffmpegcolorspace ! warptv ! ffmpegcolorspace ! capsfilter caps="video/x-raw-rgb, bpp=(int)24, depth=(int)24, endianess=(int)4321, red_mask=(int)16711680, green_mask=(int)65280, blue_mask=(int)255"';
% Set noMaster = 1 if all cams are externally hardware triggered slaves, 0 otherwise:
noMaster = 1;
% Always use a master, ie., noMaster false if not hardware synced.
if syncmode ~= 16
noMaster = 0;
end
% We limit default framerate to 30 fps instead of auto-detected maximum
% as supported by a camera in order to limit the consumption of bus bandwidth.
% Otherwise we might run out of bandwidth with multiple connected cameras.
fps = 30;
% Select maximum number of frames to capture and record: Zero for "unlimited"
maxTargetFrameCount = 0;
% For now we only use the DC1394-Firewire capture engine, as setup with
% the GStreamer engine is not impossible, but more difficult/error-prone
% and less flexible when it comes to complex camera control and sync.
Screen('Preference', 'DefaultVideocaptureEngine', 1);
% Also disable sync tests, as visual timing doesn't work well anyway
% on windowed non-fullscreen GUI windows:
oldsynctests = Screen('Preference', 'SkipSyncTests', 2);
screenid=max(Screen('Screens'));
if isempty(deviceIds)
devs = Screen('VideoCaptureDevices');
for i=1:length(devs)
% Use device if either its deviceIndex is not zero, or all enumerated devices if
% the libdc1394 capture engine is in use. On other engines, deviceIndex 0 is special
% in that it defines the default capture device. The same device shows up a second
% time under a distinct device index, so we have to filter out deviceIndex 0 to avoid
% opening the same camera twice:
if (devs(i).DeviceIndex ~= 0) || (Screen('Preference', 'DefaultVideocaptureEngine') == 1)
disp(devs(i));
deviceIds = [deviceIds, devs(i).DeviceIndex]; %#ok<AGROW>
end
end
end
if isempty(deviceIds)
fprintf('Sorry, could not detect any suitable video cameras. Bye.\n');
return;
end
try
for i=1:length(deviceIds)
% Open oncreen window for i'th camera:
win(i) = PsychImaging('OpenWindow', screenid, 0, [0, 0, 650, 500], [], [], [], [], [], kPsychGUIWindow + kPsychGUIWindowWMPositioned); %#ok<AGROW>
% Set text size for info text:
Screen('TextSize', win(i), 24);
% Open i'th camera:
grabbers(i) = Screen('OpenVideoCapture', win(i), deviceIds(i), roi, depth, 64, [], codec, captureFlags, [], bitdepth); %#ok<AGROW>
if i == 1
% Reset firewire bus for this camera:
% Screen('SetVideoCaptureParameter', grabbers(i), 'ResetBus');
% Reset this camera:
%Screen('SetVideoCaptureParameter', grabbers(i), 'ResetCamera');
end
% Multi-camera sync mode requested?
if syncmode > 0
if i == 1
% First one is sync-master: Unless noMaster == 1, in which case there are only slaves.
Screen('SetVideoCaptureParameter', grabbers(1), 'SyncMode', syncmode + 1 + noMaster);
if Screen('SetVideoCaptureParameter', grabbers(1), 'SyncMode') ~= (syncmode + 1 + noMaster)
error('Sync master camera does not support requested sync mode %i! Game over!', syncmode);
end
else
% Others are sync-slaves:
Screen('SetVideoCaptureParameter', grabbers(i), 'SyncMode', syncmode + 2);
if Screen('SetVideoCaptureParameter', grabbers(i), 'SyncMode') ~= syncmode + 2
% This slave does not support syncmode! Means the syncmode must be hardware sync,
% as that is the only one which can be unsupported. Fall back to bus sync and switch
% master into combined hw sync + bus sync mode:
fprintf('Sync slave camera %i does not support requested sync mode %i!\n', grabbers(i), syncmode);
% Hardware sync requested but unsupported by this slave?
if (syncmode == 16) && ~noMaster
% Yes, workaround via additional bus-sync and hope for the best:
fprintf('Switching sync slave camera %i to bus sync as fallback. Master will emit bus-sync signals too.\n', grabbers(i));
% Set slave to bus sync:
Screen('SetVideoCaptureParameter', grabbers(i), 'SyncMode', 8 + 2);
% Set master to bus sync in addition to hw sync:
Screen('SetVideoCaptureParameter', grabbers(1), 'SyncMode', 16 + 8 + 1);
end
end
end
end
% Use TriggerMode 0 "Start of exposure by trigger, duration of exposure by 'Shutter' setting". Trigger exposure on falling edge,
% (active low TriggerPolarity), get signal from TriggerSource 0, aka port 0:
fprintf('Camera %i : OldTriggerMode = %i\n', grabbers(i), Screen('SetVideoCaptureParameter', grabbers(i), 'TriggerMode', 0));
fprintf('Camera %i : OldTriggerPolarity = %i\n', grabbers(i), Screen('SetVideoCaptureParameter', grabbers(i), 'TriggerPolarity', 0));
fprintf('Camera %i : OldTriggerSource = %i\n', grabbers(i), Screen('SetVideoCaptureParameter', grabbers(i), 'TriggerSource', 0));
fprintf('Camera %i : TriggerSources = ', grabbers(i)); disp(Screen('SetVideoCaptureParameter', grabbers(i), 'GetTriggerSources'));
% Configure i'th camera:
%brightness = Screen('SetVideoCaptureParameter', grabbers(i), 'Brightness',383)
%exposure = Screen('SetVideoCaptureParameter', grabbers(i), 'Exposure',130)
%gain = Screen('SetVideoCaptureParameter', grabbers(i), 'Gain')
%gamma = Screen('SetVideoCaptureParameter', grabbers(i), 'Gamma')
%shutter = Screen('SetVideoCaptureParameter', grabbers(i), 'Shutter', 7)
%vendor = Screen('SetVideoCaptureParameter', grabbers(i), 'GetVendorname')
%model = Screen('SetVideoCaptureParameter', grabbers(i), 'GetModelname')
%fps = Screen('SetVideoCaptureParameter', grabbers(i), 'GetFramerate')
%roi = Screen('SetVideoCaptureParameter', grabbers(i), 'GetROI')
%bmode = Screen('SetVideoCaptureParameter', grabbers(i), '1394BModeActive', 0)
%isospeed = Screen('SetVideoCaptureParameter', grabbers(i), 'ISOSpeed', 400)
%pio = Screen('SetVideoCaptureParameter', grabbers(i), 'PIO', 1)
%pio = Screen('SetVideoCaptureParameter', grabbers(i), 'PIO')
%[targetTemperature, currentTemperature] = Screen('SetVideoCaptureParameter', grabbers(i), 'Temperature', 123)
%[u,v] = Screen('SetVideoCaptureParameter', grabbers(i), 'WhiteBalance', 161, 116)
%[u,v] = Screen('SetVideoCaptureParameter', grabbers(i), 'WhiteBalance')
%[wr, wg, wb] = Screen('SetVideoCaptureParameter', grabbers(i), 'WhiteShading')
% Measure firewire bus cycles for fun and profit :-)
[cycleSecs1, cycleSystemTime1, cycleSec, cycleCount, cycleOffset] = Screen('SetVideoCaptureParameter', grabbers(i), 'GetCycleTimer');
WaitSecs(0.1);
[cycleSecs2, cycleSystemTime2] = Screen('SetVideoCaptureParameter', grabbers(i), 'GetCycleTimer');
fprintf('Camera %i: Bus runs at %f seconds per second.\n', grabbers(i), (cycleSecs2 - cycleSecs1) / (cycleSystemTime2 - cycleSystemTime1));
fprintf('Camera %i: Initial bus timestamps were cycleSec %i, cycleCount %i, cycleOffset %i.\n', grabbers(i), cycleSec, cycleCount, cycleOffset);
% Basler camera?
if strfind(Screen('SetVideoCaptureParameter', grabbers(i), 'GetVendorname'), 'Basler')
% Yes. Enable some Basler specific SFF features:
% The Basler SFF framecounter is mostly useless to us, as it only resets to zero on a power-cycle,
% and the cameras can't get power-cycled in software, only by physical unplug/replug :(.
% Update: Some Basler cameras allow power-cycling, so it does work on those, e.g., the A602f works,
% but the A312fc doesn't.
% baslerFrameCounter = Screen('SetVideoCaptureParameter', grabbers(i), 'BaslerFrameCounterEnable')
% Basler SFF CRC checksumming can find corrupted video frames due to problems with camera electronics,
% bus cables, controllers, OS etc. It is very compute intense though, adds easily 10 msecs per frame,
% so one should probably only enable it to diagnose real problems or initially verify a setup:
% baslerChecksum = Screen('SetVideoCaptureParameter', grabbers(i), 'BaslerChecksumEnable')
% Basler SFF timestamping can theoretically provide a capture timestamp corresponding to the exact
% time when image exposure on the cameras sensor was started. The camera can tag frames with the
% firewire bus time of start of exposure and Screen() can translate that into GetSecs time.
%
% In practice, all two tested models of Basler cameras didn't work. They returned a constant
% bogus value as timestamp, leading to bogus capture timestamps. No bug could be found in our code
% or the libdc1394 code when comparing code against the Basler SFF spec documents.
% baslerTimestamp = Screen('SetVideoCaptureParameter', grabbers(i), 'BaslerFrameTimestampEnable')
end
Screen('SetVideoCaptureParameter', grabbers(i), 'PrintParameters')
% Select convMode as conversion mode:
Screen('SetVideoCaptureParameter', grabbers(i), 'DataConversionMode', convMode);
% Set an override bayer pattern to use if it can't get auto-detected:
Screen('SetVideoCaptureParameter', grabbers(i), 'OverrideBayerPattern', bayerPattern);
% Select debayer algorithm:
Screen('SetVideoCaptureParameter', grabbers(i), 'DebayerMethod', debayerMethod);
% Ask engine to prefer Format-7 video capture modes over bog-standard Non-Format-7 ones.
% Normally the engine decides itself what is the best choice. Forcing the engine to
% use Format-7 sometimes allows to save a bit of bus-bandwidth and thereby squeeze out
% higher framerates, resolutions or use of more cameras on a single bus in multi-cam capture.
Screen('SetVideoCaptureParameter', grabbers(i), 'PreferFormat7Modes', 1);
if doVideoRecording
% If video recording is requested, set a unique movie filename per camera:
Screen('SetVideoCaptureParameter', grabbers(i), sprintf('SetNewMoviename=%s_Cam%02d.mov', movieName, grabbers(i)));
end
% If a specific maximum framecount is requested for end of capture/recording, set it here
% before capture gets started:
% Setting the count for the slaves it not always neccessary, as the master will distribute
% its limit to its slaves in many common scenarios, but then "better safe than sorry".
if maxTargetFrameCount > 0
Screen('SetVideoCaptureParameter', grabbers(i), 'StopAtFramecount', maxTargetFrameCount);
fprintf('Targetting stop of capture on camera %i at target framecount %i.\n', grabbers(i), maxTargetFrameCount);
end
% Assign GStreamer post processing string, if any:
if ~isempty(processingString)
Screen('SetVideoCaptureParameter', grabbers(i), sprintf('SetGStreamerProcessingPipeline=%s', processingString));
end
end
% Start capture on all cameras:
if syncmode == 0
% Start one after the other:
for grabber=grabbers
Screen('StartVideoCapture', grabber, fps, dropframes);
end
else
% Multicam sync enabled. First start all slaves:
oldverb = Screen('Preference','Verbosity', 4);
fprintf('Prepare for synced start! Warp 1 ...\n\n');
for grabber=grabbers(2:end)
Screen('StartVideoCapture', grabber, fps, dropframes);
end
% Only wait for keypress if there is a designated master. With
% only slaves, that wait would be futile:
if ~noMaster
KbStrokeWait;
end
fprintf('Engage! ...\n\n');
% Start master:
Screen('StartVideoCapture', grabbers(1), fps, dropframes);
fprintf('And we are flying!\n\n');
Screen('Preference','Verbosity', oldverb);
end
% If a specific maximum framecount is requested for end of capture/recording, set it here dynamically
% while capture is already started:
if maxTargetFrameCount < 0
% For maximum robustness one should set the count for all slaves first, before the master:
% Setting the count for the slaves it not always neccessary, as the master will distribute
% its limit to its slaves in many common scenarios, but then "better safe than sorry".
for grabber = grabbers(2:end)
Screen('SetVideoCaptureParameter', grabber, 'StopAtFramecount', abs(maxTargetFrameCount));
end
% Finally set master / first grabber:
Screen('SetVideoCaptureParameter', grabbers(1), 'StopAtFramecount', abs(maxTargetFrameCount));
fprintf('Targetting stop of capture at target framecount %i.\n', abs(maxTargetFrameCount));
end
capturestopped = 0;
dstRect = [];
count = 0;
oldpts = zeros(size(grabbers));
texcount = zeros(size(grabbers));
camtex = zeros(length(grabbers), fps * 10);
campts = zeros(size(camtex));
t=GetSecs;
% Multicapture and display loop: Runs until timeout of 120 seconds or until keypress
% if there isn't any master cam or if no recording is requested:
while dropframes || noMaster || ((GetSecs - t) < 120)
if KbCheck
if ~capturestopped
capturestopped = 1;
maxTargetFrameCount = Screen('SetVideoCaptureParameter', grabbers(1), 'GetFutureMaxFramecount');
fprintf('Logically stopping capture on master by setting stop frame count to current maximum framecount %i!\n', maxTargetFrameCount);
Screen('SetVideoCaptureParameter', grabbers(1), 'StopAtFramecount', maxTargetFrameCount);
fprintf('Capture on master scheduled to stop.\n');
KbReleaseWait;
else
break;
end
end
for i=1:length(grabbers)
[tex pts nrdropped] = Screen('GetCapturedImage', win(i), grabbers(i), 0); %#ok<NASGU>
% fprintf('tex = %i pts = %f nrdropped = %i\n', tex, pts, nrdropped);
if tex > 0
% Draw new texture from framegrabber.
Screen('DrawTexture', win(i), tex, [], dstRect);
% Print pts:
Screen('DrawText', win(i), sprintf('%.4f [%i of %i]', pts - t, Screen('SetVideoCaptureParameter', grabbers(i), 'GetFetchedFramecount'), Screen('SetVideoCaptureParameter', grabbers(i), 'GetCurrentFramecount')), ...
0, 0, [1 0 0]);
if count > 0
% Compute delta:
delta = (pts - oldpts(i)) * 1000;
Screen('DrawText', win(i), sprintf('%.4f', delta), 0, 20, [1 0 0]);
end
oldpts(i) = pts;
% Show it. Don't sync to video refresh at all, as it would cause
% performance degradation due to lockstep between window updates.
Screen('Flip', win(i), [], [], 2);
if dropframes
Screen('Close', tex);
else
texcount(i) = texcount(i) + 1; %#ok<UNRCH>
camtex(i, texcount(i)) = tex;
campts(i, texcount(i)) = pts;
end
tex = 0; %#ok<NASGU>
end
count = count + 1;
end
% WaitSecs('YieldSecs', 0.030);
end
telapsed = GetSecs - t;
fprintf('Elapsed runtime %f seconds.\n', telapsed);
for grabber=grabbers
fprintf('Camera %i : Bandwidth = %f\n', grabber, Screen('SetVideoCaptureParameter', grabber, 'GetBandwidthUsage'));
fprintf('Camera %i : UsedTriggerMode = %i\n', grabber, Screen('SetVideoCaptureParameter', grabber, 'TriggerMode'));
fprintf('Camera %i : UsedTriggerPolarity = %i\n', grabber, Screen('SetVideoCaptureParameter', grabber, 'TriggerPolarity'));
fprintf('Camera %i : UsedTriggerSource = %i\n', grabber, Screen('SetVideoCaptureParameter', grabber, 'TriggerSource'));
end
% Stop all cameras:
if syncmode == 0
% Unsynchronized operation: Stop one after the other:
for grabber=grabbers
Screen('StopVideoCapture', grabber);
end
else
% Multicam sync enabled.
% First some feedback about sync:
for grabber=grabbers
fprintf('Camera %i : Possible max framecount = %i\n', grabber, Screen('SetVideoCaptureParameter', grabber, 'GetFutureMaxFramecount'));
end
% Stop master first:
fprintf('Drop us out of warp!\n');
Screen('StopVideoCapture', grabbers(1));
% Then stop all slaves:
fprintf('Sublight reached ...\n');
for grabber=grabbers(2:end)
Screen('StopVideoCapture', grabber);
end
fprintf('And quarter impulse ahead.\n');
end
% Close down cameras, and some final stats:
for grabber=grabbers
fprintf('Camera %i : Final framecount = %i\n', grabber, Screen('SetVideoCaptureParameter', grabber, 'GetCurrentFramecount'));
fprintf('Camera %i : Possible framecount = %i\n', grabber, Screen('SetVideoCaptureParameter', grabber, 'GetFutureMaxFramecount'));
fprintf('Camera %i : Corrupted frames count = %i\n', grabber, Screen('SetVideoCaptureParameter', grabber, 'GetCorruptFramecount'));
Screen('CloseVideoCapture', grabber);
end
if ~dropframes
fi = 1;
while 1
[secs, keyCode] = KbWait; %#ok<ASGLU>
if keyCode(escape)
break;
end
if keyCode(backKey)
fi = max(1, fi - 1);
end
if keyCode(forwardKey)
fi = min(min(texcount), fi + 1);
end
for i=1:length(grabbers)
% Draw new texture from framegrabber.
Screen('DrawTexture', win(i), camtex(i, fi), [], dstRect);
% Print pts:
Screen('DrawText', win(i), sprintf('%.4f', campts(i, fi) - t), 0, 0, [1 0 0]);
% Show it:
Screen('Flip', win(i), [], [], 1);
end
end
end
% Close all textures explicitely to avoid "many open textures" warning:
Screen('Close');
% Close all windows and release all remaining display resources:
Screen('CloseAll');
Screen('Preference', 'SkipSyncTests', oldsynctests);
catch %#ok<*CTCH>
% Emergency shutdown:
sca;
Screen('Preference', 'SkipSyncTests', oldsynctests);
psychrethrow(psychlasterror);
end
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