📄 mmread.m
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warning('Audio data format not recognized/supported, it probably is going to be useless.');
end
% reshape the data so that it is nrChannels x Samples. This should be the same output as wavread.
audio(i).data = reshape(d,nrChannels,length(d)/nrChannels)';
end
FFGrab('cleanUp');
catch
try
err = lasterror;
if ~isempty(strfind(err.message,'libavbin'))
switch mexext
case 'mexa64'
if strfind(err.message,'No such file')
if exist('libavbin.so.64','file')
if exist('libavbin.so','file')
d64=dir('libavbin.so.64');
d=dir('libavbin.so');
if d.bytes ~= d64.bytes
R=input('libavbin.so is installed but seems to be the 32bit version.\nShall I correct this (no admin required)? [Y/n]','s');
if ~isequal(R,'n') & ~isequal(R,'N')
if copyfile('libavbin.so.64','libavbin.so','f')
error('libavbin.so installed. You may need to restart Matlab for mmread to function.');
else
error('libavbin.so failed to install: couldn''t write to libavbin.so');
end
end
end
else
R=input('libavbin.so needs to be installed.\nShall I install this for you (no admin required)? [Y/n]','s');
if ~isequal(R,'n') && ~isequal(R,'N')
if copyfile('libavbin.so.64','libavbin.so','f')
error('libavbin.so installed. You may need to restart Matlab for mmread to function.');
else
error('libavbin.so failed to install: couldn''t write to libavbin.so');
end
end
end
end
end
case 'mexglx'
if strfind(err.message,'No such file')
if exist('libavbin.so.32','file')
if exist('libavbin.so','file')
d32=dir('libavbin.so.32');
d=dir('libavbin.so');
if d.bytes ~= d32.bytes
R=input('libavbin.so is installed but seems to be the 64bit version.\nShall I correct this (no admin required)? [Y/n]','s');
if ~isequal(R,'n') && ~isequal(R,'N')
if copyfile('libavbin.so.32','libavbin.so','f')
error('libavbin.so installed. You may need to restart Matlab for mmread to function.');
else
error('libavbin.so failed to install: couldn''t write to libavbin.so');
end
end
end
else
R=input('libavbin.so needs to be installed.\nShall I install this for you (no admin required)? [Y/n]','s');
if ~isequal(R,'n') && ~isequal(R,'N')
if copyfile('libavbin.so.32','libavbin.so','f')
error('libavbin.so installed. You may need to restart Matlab for mmread to function.');
else
error('libavbin.so failed to install: couldn''t write to libavbin.so');
end
end
end
end
end
case {'mexmac', 'mexmaci', 'mexmaci64'}
R=input('libavbin.dylib needs to be installed.\nShall I install this for you (no admin required)? [Y/n]','s');
if ~isequal(R,'n') && ~isequal(R,'N')
if ~exist('~/lib','dir')
if ~mkdir('~/lib')
error('A lib directory doesn''t exist in your home directory, and one couldn''t be created.');
end
end
if copyfile('libavbin.dylib','~/lib/libavbin.dylib','f')
error('libavbin.dylib installed. You may need to restart Matlab for mmread to function.');
else
error('libavbin.dylib failed to install: couldn''t write to libavbin.dylib');
end
end
end
end
try
FFGrab('cleanUp');
catch
end
rethrow(err);
catch
if ~strmatch(computer,'PCWIN')
cd(currentdir);
end
rethrow(lasterror);
end
end
if ~strmatch(computer,'PCWIN')
cd(currentdir);
end
else
try
mexDDGrab('buildGraph',filename);
if (isempty(time))
mexDDGrab('setFrames',frames);
else
if (numel(time) ~= 2)
error('time must be a vector of length 2: [startTime stopTime]');
end
mexDDGrab('setTime',time(1),time(2));
end
if (disableVideo)
mexDDGrab('disableVideo');
end;
if (disableAudio | nargout < 2)
mexDDGrab('disableAudio');
end;
mexDDGrab('setMatlabCommand',matlabCommand);
mexDDGrab('setTrySeeking',double(trySeeking));
try
mexDDGrab('doCapture');
catch
err = lasterror;
if (~strcmp(err.identifier,'processFrame:STOP'))
rethrow(err);
end
end
[nrVideoStreams, nrAudioStreams] = mexDDGrab('getCaptureInfo');
video = struct('width',{},'height',{},'nrFramesTotal',{},'frames',{});
audio = struct('nrChannels',{},'rate',{},'bits',{},'nrFramesTotal',{},'data',{},'frames',{});
warned = false;
% we can only get the video frames if we don't process a matlabCommand
if strcmp(matlabCommand,'')
% loop through getting all of the video data from each stream
for i=1:nrVideoStreams
[width, height, rate, nrFramesCaptured, nrFramesTotal, totalDuration] = mexDDGrab('getVideoInfo',i-1);
video(i).width = width;
video(i).height = height;
video(i).rate = rate;
video(i).nrFramesTotal = nrFramesTotal;
video(i).totalDuration = totalDuration;
video(i).frames = struct('cdata',cell(1,nrFramesCaptured),'colormap',cell(1,nrFramesCaptured));
video(i).times = zeros(size(video(i).frames));
video(i).skippedFrames = [];
if (nrFramesTotal > 0 && any(frames > nrFramesTotal))
warning('mmread:general',['Frame(s) ' num2str(frames(frames>nrFramesTotal)) ' exceed the number of frames in the movie.']);
end
scanline = ceil(width*3/4)*4; % the scanline size must be a multiple of 4.
for f=1:nrFramesCaptured
[data, time] = mexDDGrab('getVideoFrame',i-1,f-1);
if (numel(data) ~= scanline*height)
if (numel(data) > 3*width*height)
if (~warned)
warning('mmread:general','dimensions do not match data size. Guessing badly...');
warned = true;
end
scanline = width*3;
data = data(1:3*width*height);
else
if (f == 1)
error('dimensions do not match data size. Too little data.');
else
warning(['dimensions do not match data size. Too little data for ' num2str(f) 'th frame.']);
continue;
end
end
end
% if there is any extra scanline data, remove it
data = reshape(data,scanline,height);
data = data(1:3*width,:);
% the data ordering is wrong for matlab images, so permute it
tmp = permute(reshape(data, 3, width, height),[3 2 1]);
% the images are also upside down and colors were backwards.
video(i).frames(f).cdata = tmp(end:-1:1,:,3:-1:1);
video(i).times(f) = time;
end
framerate = (max(video(i).times)-min(video(i).times))/nrFramesCaptured;
if framerate > 0
video(i).skippedFrames = any(diff(video(i).times)>framerate*1.8) & abs(mean(diff(video(i).times))-framerate)/framerate<0.05;
end
% if frames are specified then make sure that the order is the same
if (~isempty(frames) && nrFramesCaptured > 0)
[uniqueFrames, dummy, frameOrder] = unique(frames);
if (length(uniqueFrames) > nrFramesCaptured)
warning('mmread:general','Not all frames specified were captured. Returning what was captured, but order may be different than specified.');
remainingFrames = frames(frames<=uniqueFrames(nrFramesCaptured));
[dummy, dummy, frameOrder] = unique(remainingFrames);
end
video(i).frames = video(i).frames(frameOrder);
video(i).times = video(i).times(frameOrder);
end
end
end
% loop through getting all of the audio data from each stream
for i=1:nrAudioStreams
[nrChannels, rate, bits, nrFramesCaptured, nrFramesTotal, subtype, totalDuration] = mexDDGrab('getAudioInfo',i-1);
audio(i).nrChannels = nrChannels;
audio(i).rate = rate;
audio(i).bits = bits;
audio(i).nrFramesTotal = nrFramesTotal;
audio(i).totalDuration = totalDuration;
audio(i).frames = cell(1,nrFramesCaptured);
for f=1:nrFramesCaptured
[data, time] = mexDDGrab('getAudioFrame',i-1,f-1);
audio(i).frames{f} = data;
audio(i).times(f) = time;
end
% combine the data across frames
d = double(cat(1,audio(i).frames{:}));
% rescale the data so that it is between -1.0 and 1.0
if (subtype==0)
%PCM formated data...
switch (bits)
case {4, 8}
d = (d-2^(bits-1))/2^(bits-1);
case {16, 24, 32}
d = d/2^(bits-1);
end
elseif (subtype==1)
if (bits == 32)
%IEEE FLOAT formated data...
if (max(d) > 1 | min(d) < -1)
% there are two float formats one that is already -1 to 1
% and the there is between -2^15 to 2^15
d = d / 2^15;
end
else
warning('Audio data format not recognized/supported, it probably is going to be useless.');
end
else
warning('Audio data format not recognized/supported, it probably is going to be useless.');
end
% reshape the data so that it is nrChannels x Samples. This should be the same output as wavread.
audio(i).data = reshape(d,nrChannels,length(d)/nrChannels)';
end
mexDDGrab('cleanUp');
catch
err = lasterror;
% mexDDGrab('cleanUp');
if strfind(err.message,'combination')
disp('The ''No combination of intermediate filters could be found to make the connection'' error');
disp('means that no appropriate codec could be found. Mpg2 files seem to be the worst. ');
disp('Installing ffdshow (www.free-codecs.com/FFDShow_download.htm) often fixes this problem. ');
end
rethrow(err);
end
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