Mac/Lib/videoreader.py

   1 # Video file reader, using QuickTime
   2 #
   3 # This module was quickly ripped out of another software package, so there is a good
   4 # chance that it does not work as-is and it needs some hacking.
   5 #
   6 # Jack Jansen, August 2000
   7 #
   8 import sys
   9 import Qt
  10 import QuickTime
  11 import Qd
  12 import Qdoffs
  13 import QDOffscreen
  14 import Res
  15 import MediaDescr
  16 import imgformat
  17 import os
  18 # import audio.format
  19 import macfs
  20
  21 class VideoFormat:
  22         def __init__(self, name, descr, width, height, format):
  23                 self.__name = name
  24                 self.__descr = descr
  25                 self.__width = width
  26                 self.__height = height
  27                 self.__format = format
  28
  29         def getname(self):
  30                 return self.__name
  31
  32         def getdescr(self):
  33                 return self.__descr
  34
  35         def getsize(self):
  36                 return self.__width, self.__height
  37
  38         def getformat(self):
  39                 return self.__format
  40
  41 class _Reader:
  42         def __init__(self, path):
  43                 fsspec = macfs.FSSpec(path)
  44                 fd = Qt.OpenMovieFile(fsspec, 0)
  45                 self.movie, d1, d2 = Qt.NewMovieFromFile(fd, 0, 0)
  46                 self.movietimescale = self.movie.GetMovieTimeScale()
  47                 try:
  48                         self.audiotrack = self.movie.GetMovieIndTrackType(1,
  49                                 QuickTime.AudioMediaCharacteristic, QuickTime.movieTrackCharacteristic)
  50                         self.audiomedia = self.audiotrack.GetTrackMedia()
  51                 except Qt.Error:
  52                         self.audiotrack = self.audiomedia = None
  53                         self.audiodescr = {}
  54                 else:
  55                         handle = Res.Handle('')
  56                         n = self.audiomedia.GetMediaSampleDescriptionCount()
  57                         self.audiomedia.GetMediaSampleDescription(1, handle)
  58                         self.audiodescr = MediaDescr.SoundDescription.decode(handle.data)
  59                         self.audiotimescale = self.audiomedia.GetMediaTimeScale()
  60                         del handle
  61
  62                 try:
  63                         self.videotrack = self.movie.GetMovieIndTrackType(1,
  64                                 QuickTime.VisualMediaCharacteristic, QuickTime.movieTrackCharacteristic)
  65                         self.videomedia = self.videotrack.GetTrackMedia()
  66                 except Qt.Error:
  67                         self.videotrack = self.videomedia = self.videotimescale = None
  68                 if self.videotrack:
  69                         self.videotimescale = self.videomedia.GetMediaTimeScale()
  70                         x0, y0, x1, y1 = self.movie.GetMovieBox()
  71                         self.videodescr = {'width':(x1-x0), 'height':(y1-y0)}
  72                         self._initgworld()
  73                 self.videocurtime = None
  74                 self.audiocurtime = None
  75
  76
  77         def __del__(self):
  78                 self.audiomedia = None
  79                 self.audiotrack = None
  80                 self.videomedia = None
  81                 self.videotrack = None
  82                 self.movie = None
  83
  84         def _initgworld(self):
  85                 old_port, old_dev = Qdoffs.GetGWorld()
  86                 try:
  87                         movie_w = self.videodescr['width']
  88                         movie_h = self.videodescr['height']
  89                         movie_rect = (0, 0, movie_w, movie_h)
  90                         self.gworld = Qdoffs.NewGWorld(32,  movie_rect, None, None, QDOffscreen.keepLocal)
  91                         self.pixmap = self.gworld.GetGWorldPixMap()
  92                         Qdoffs.LockPixels(self.pixmap)
  93                         Qdoffs.SetGWorld(self.gworld.as_GrafPtr(), None)
  94                         Qd.EraseRect(movie_rect)
  95                         self.movie.SetMovieGWorld(self.gworld.as_GrafPtr(), None)
  96                         self.movie.SetMovieBox(movie_rect)
  97                         self.movie.SetMovieActive(1)
  98                         self.movie.MoviesTask(0)
  99                         self.movie.SetMoviePlayHints(QuickTime.hintsHighQuality, QuickTime.hintsHighQuality)
 100                         # XXXX framerate
 101                 finally:
 102                         Qdoffs.SetGWorld(old_port, old_dev)
 103
 104         def _gettrackduration_ms(self, track):
 105                 tracktime = track.GetTrackDuration()
 106                 return self._movietime_to_ms(tracktime)
 107
 108         def _movietime_to_ms(self, time):
 109                 value, d1, d2 = Qt.ConvertTimeScale((time, self.movietimescale, None), 1000)
 110                 return value
 111
 112         def _videotime_to_ms(self, time):
 113                 value, d1, d2 = Qt.ConvertTimeScale((time, self.videotimescale, None), 1000)
 114                 return value
 115
 116         def _audiotime_to_ms(self, time):
 117                 value, d1, d2 = Qt.ConvertTimeScale((time, self.audiotimescale, None), 1000)
 118                 return value
 119
 120         def _videotime_to_movietime(self, time):
 121                 value, d1, d2 = Qt.ConvertTimeScale((time, self.videotimescale, None),
 122                                 self.movietimescale)
 123                 return value
 124
 125         def HasAudio(self):
 126                 return not self.audiotrack is None
 127
 128         def HasVideo(self):
 129                 return not self.videotrack is None
 130
 131         def GetAudioDuration(self):
 132                 if not self.audiotrack:
 133                         return 0
 134                 return self._gettrackduration_ms(self.audiotrack)
 135
 136         def GetVideoDuration(self):
 137                 if not self.videotrack:
 138                         return 0
 139                 return self._gettrackduration_ms(self.videotrack)
 140
 141         def GetAudioFormat(self):
 142                 bps = self.audiodescr['sampleSize']
 143                 nch = self.audiodescr['numChannels']
 144                 if nch == 1:
 145                         channels = ['mono']
 146                 elif nch == 2:
 147                         channels = ['left', 'right']
 148                 else:
 149                         channels = map(lambda x: str(x+1), range(nch))
 150                 if bps % 8:
 151                         # Funny bits-per sample. We pretend not to understand
 152                         blocksize = 0
 153                         fpb = 0
 154                 else:
 155                         # QuickTime is easy (for as far as we support it): samples are always a whole
 156                         # number of bytes, so frames are nchannels*samplesize, and there's one frame per block.
 157                         blocksize = (bps/8)*nch
 158                         fpb = 1
 159                 if self.audiodescr['dataFormat'] == 'raw ':
 160                         encoding = 'linear-excess'
 161                 elif self.audiodescr['dataFormat'] == 'twos':
 162                         encoding = 'linear-signed'
 163                 else:
 164                         encoding = 'quicktime-coding-%s'%self.audiodescr['dataFormat']
 165 ##              return audio.format.AudioFormatLinear('quicktime_audio', 'QuickTime Audio Format',
 166 ##                      channels, encoding, blocksize=blocksize, fpb=fpb, bps=bps)
 167                 return channels, encoding, blocksize, fpb, bps
 168
 169         def GetAudioFrameRate(self):
 170                 return int(self.audiodescr['sampleRate'])
 171
 172         def GetVideoFormat(self):
 173                 width = self.videodescr['width']
 174                 height = self.videodescr['height']
 175                 return VideoFormat('dummy_format', 'Dummy Video Format', width, height, imgformat.macrgb)
 176
 177         def GetVideoFrameRate(self):
 178                 tv = self.videocurtime
 179                 if tv == None:
 180                         tv = 0
 181                 flags = QuickTime.nextTimeStep|QuickTime.nextTimeEdgeOK
 182                 tv, dur = self.videomedia.GetMediaNextInterestingTime(flags, tv, 1.0)
 183                 dur = self._videotime_to_ms(dur)
 184                 return int((1000.0/dur)+0.5)
 185
 186         def ReadAudio(self, nframes, time=None):
 187                 if not time is None:
 188                         self.audiocurtime = time
 189                 flags = QuickTime.nextTimeStep|QuickTime.nextTimeEdgeOK
 190                 if self.audiocurtime == None:
 191                         self.audiocurtime = 0
 192                 tv = self.audiomedia.GetMediaNextInterestingTimeOnly(flags, self.audiocurtime, 1.0)
 193                 if tv < 0 or (self.audiocurtime and tv < self.audiocurtime):
 194                         return self._audiotime_to_ms(self.audiocurtime), None
 195                 h = Res.Handle('')
 196                 desc_h = Res.Handle('')
 197                 size, actualtime, sampleduration, desc_index, actualcount, flags = \
 198                         self.audiomedia.GetMediaSample(h, 0, tv, desc_h, nframes)
 199                 self.audiocurtime = actualtime + actualcount*sampleduration
 200                 return self._audiotime_to_ms(actualtime), h.data
 201
 202         def ReadVideo(self, time=None):
 203                 if not time is None:
 204                         self.videocurtime = time
 205                 flags = QuickTime.nextTimeStep
 206                 if self.videocurtime == None:
 207                         flags = flags | QuickTime.nextTimeEdgeOK
 208                         self.videocurtime = 0
 209                 tv = self.videomedia.GetMediaNextInterestingTimeOnly(flags, self.videocurtime, 1.0)
 210                 if tv < 0 or (self.videocurtime and tv <= self.videocurtime):
 211                         return self._videotime_to_ms(self.videocurtime), None
 212                 self.videocurtime = tv
 213                 moviecurtime = self._videotime_to_movietime(self.videocurtime)
 214                 self.movie.SetMovieTimeValue(moviecurtime)
 215                 self.movie.MoviesTask(0)
 216                 return self._videotime_to_ms(self.videocurtime), self._getpixmapcontent()
 217
 218         def _getpixmapcontent(self):
 219                 """Shuffle the offscreen PixMap data, because it may have funny stride values"""
 220                 rowbytes = Qdoffs.GetPixRowBytes(self.pixmap)
 221                 width = self.videodescr['width']
 222                 height = self.videodescr['height']
 223                 start = 0
 224                 rv = ''
 225                 for i in range(height):
 226                         nextline = Qdoffs.GetPixMapBytes(self.pixmap, start, width*4)
 227                         start = start + rowbytes
 228                         rv = rv + nextline
 229                 return rv
 230
 231 def reader(url):
 232         try:
 233                 rdr = _Reader(url)
 234         except IOError:
 235                 return None
 236         return rdr
 237
 238 def _test():
 239         import img
 240         import MacOS
 241         Qt.EnterMovies()
 242         fss, ok = macfs.PromptGetFile('Video to convert')
 243         if not ok: sys.exit(0)
 244         path = fss.as_pathname()
 245         rdr = reader(path)
 246         if not rdr:
 247                 sys.exit(1)
 248         dstfss, ok = macfs.StandardPutFile('Name for output folder')
 249         if not ok: sys.exit(0)
 250         dstdir = dstfss.as_pathname()
 251         num = 0
 252         os.mkdir(dstdir)
 253         videofmt = rdr.GetVideoFormat()
 254         imgfmt = videofmt.getformat()
 255         imgw, imgh = videofmt.getsize()
 256         timestamp, data = rdr.ReadVideo()
 257         while data:
 258                 fname = 'frame%04.4d.jpg'%num
 259                 num = num+1
 260                 pname = os.path.join(dstdir, fname)
 261                 print 'Writing', fname, imgw, imgh, len(data)
 262                 wrt = img.writer(imgfmt, pname)
 263                 wrt.width = imgw
 264                 wrt.height = imgh
 265                 wrt.write(data)
 266                 timestamp, data = rdr.ReadVideo()
 267                 MacOS.SetCreatorAndType(pname, 'ogle', 'JPEG')
 268                 if num > 20:
 269                         print 'stopping at 20 frames so your disk does not fill up:-)'
 270                         break
 271         print 'Total frames:', num
 272
 273 if __name__ == '__main__':
 274         _test()
 275         sys.exit(1)
 276