Read a QuickTime movie and return the frames.

Mac/Lib/videoreader.py

+# Video file reader, using QuickTime
+#
+# This module was quickly ripped out of another software package, so there is a good
+# chance that it does not work as-is and it needs some hacking.
+#
+# Jack Jansen, August 2000
+#
+import sys
+import Qt
+import QuickTime
+import Qd
+import Qdoffs
+import QDOffscreen
+import Res
+import MediaDescr
+import imgformat
+import os
+# import audio.format
+import macfs
+
+class VideoFormat:
+	def __init__(self, name, descr, width, height, format):
+		self.__name = name
+		self.__descr = descr
+		self.__width = width
+		self.__height = height
+		self.__format = format
+		
+	def getname(self):
+		return self.__name
+		
+	def getdescr(self):
+		return self.__descr
+		
+	def getsize(self):
+		return self.__width, self.__height
+		
+	def getformat(self):
+		return self.__format
+		
+class _Reader:
+	def __init__(self, path):
+		fsspec = macfs.FSSpec(path)
+		fd = Qt.OpenMovieFile(fsspec, 0)
+		self.movie, d1, d2 = Qt.NewMovieFromFile(fd, 0, 0)
+		self.movietimescale = self.movie.GetMovieTimeScale()
+		try:
+			self.audiotrack = self.movie.GetMovieIndTrackType(1,
+				QuickTime.AudioMediaCharacteristic, QuickTime.movieTrackCharacteristic)
+			self.audiomedia = self.audiotrack.GetTrackMedia()
+		except Qt.Error:
+			self.audiotrack = self.audiomedia = None
+			self.audiodescr = {}
+		else:
+			handle = Res.Handle('')
+			n = self.audiomedia.GetMediaSampleDescriptionCount()
+			self.audiomedia.GetMediaSampleDescription(1, handle)
+			self.audiodescr = MediaDescr.SoundDescription.decode(handle.data)
+			self.audiotimescale = self.audiomedia.GetMediaTimeScale()
+			del handle
+	
+		try:	
+			self.videotrack = self.movie.GetMovieIndTrackType(1,
+				QuickTime.VisualMediaCharacteristic, QuickTime.movieTrackCharacteristic)
+			self.videomedia = self.videotrack.GetTrackMedia()
+		except Qt.Error:
+			self.videotrack = self.videomedia = self.videotimescale = None
+		if self.videotrack:
+			self.videotimescale = self.videomedia.GetMediaTimeScale()
+			x0, y0, x1, y1 = self.movie.GetMovieBox()
+			self.videodescr = {'width':(x1-x0), 'height':(y1-y0)}
+			self._initgworld()
+		self.videocurtime = None
+		self.audiocurtime = None
+
+		
+	def __del__(self):
+		self.audiomedia = None
+		self.audiotrack = None
+		self.videomedia = None
+		self.videotrack = None
+		self.movie = None
+		
+	def _initgworld(self):
+		old_port, old_dev = Qdoffs.GetGWorld()
+		try:
+			movie_w = self.videodescr['width']
+			movie_h = self.videodescr['height']
+			movie_rect = (0, 0, movie_w, movie_h)
+			self.gworld = Qdoffs.NewGWorld(32,  movie_rect, None, None, QDOffscreen.keepLocal)
+			self.pixmap = self.gworld.GetGWorldPixMap()
+			Qdoffs.LockPixels(self.pixmap)
+			Qdoffs.SetGWorld(self.gworld.as_GrafPtr(), None)
+			Qd.EraseRect(movie_rect)
+			self.movie.SetMovieGWorld(self.gworld.as_GrafPtr(), None)
+			self.movie.SetMovieBox(movie_rect)
+			self.movie.SetMovieActive(1)
+			self.movie.MoviesTask(0)
+			self.movie.SetMoviePlayHints(QuickTime.hintsHighQuality, QuickTime.hintsHighQuality)
+			# XXXX framerate
+		finally:
+			Qdoffs.SetGWorld(old_port, old_dev)
+		
+	def _gettrackduration_ms(self, track):
+		tracktime = track.GetTrackDuration()
+		return self._movietime_to_ms(tracktime)
+		
+	def _movietime_to_ms(self, time):
+		value, d1, d2 = Qt.ConvertTimeScale((time, self.movietimescale, None), 1000)
+		return value
+		
+	def _videotime_to_ms(self, time):
+		value, d1, d2 = Qt.ConvertTimeScale((time, self.videotimescale, None), 1000)
+		return value
+		
+	def _audiotime_to_ms(self, time):
+		value, d1, d2 = Qt.ConvertTimeScale((time, self.audiotimescale, None), 1000)
+		return value
+		
+	def _videotime_to_movietime(self, time):
+		value, d1, d2 = Qt.ConvertTimeScale((time, self.videotimescale, None),
+				self.movietimescale)
+		return value
+		
+	def HasAudio(self):
+		return not self.audiotrack is None
+		
+	def HasVideo(self):
+		return not self.videotrack is None
+		
+	def GetAudioDuration(self):
+		if not self.audiotrack:
+			return 0
+		return self._gettrackduration_ms(self.audiotrack)
+
+	def GetVideoDuration(self):
+		if not self.videotrack:
+			return 0
+		return self._gettrackduration_ms(self.videotrack)
+		
+	def GetAudioFormat(self):
+		bps = self.audiodescr['sampleSize']
+		nch = self.audiodescr['numChannels']
+		if nch == 1:
+			channels = ['mono']
+		elif nch == 2:
+			channels = ['left', 'right']
+		else:
+			channels = map(lambda x: str(x+1), range(nch))
+		if bps % 8:
+			# Funny bits-per sample. We pretend not to understand
+			blocksize = 0
+			fpb = 0
+		else:
+			# QuickTime is easy (for as far as we support it): samples are always a whole
+			# number of bytes, so frames are nchannels*samplesize, and there's one frame per block.
+			blocksize = (bps/8)*nch
+			fpb = 1
+		if self.audiodescr['dataFormat'] == 'raw ':
+			encoding = 'linear-excess'
+		elif self.audiodescr['dataFormat'] == 'twos':
+			encoding = 'linear-signed'
+		else:
+			encoding = 'quicktime-coding-%s'%self.audiodescr['dataFormat']
+##		return audio.format.AudioFormatLinear('quicktime_audio', 'QuickTime Audio Format', 
+##			channels, encoding, blocksize=blocksize, fpb=fpb, bps=bps)
+		return channels, encoding, blocksize, fpb, bps
+			
+	def GetAudioFrameRate(self):
+		return int(self.audiodescr['sampleRate'])
+		
+	def GetVideoFormat(self):
+		width = self.videodescr['width']
+		height = self.videodescr['height']
+		return VideoFormat('dummy_format', 'Dummy Video Format', width, height, imgformat.macrgb)
+		
+	def GetVideoFrameRate(self):
+		tv = self.videocurtime
+		if tv == None:
+			tv = 0
+		flags = QuickTime.nextTimeStep|QuickTime.nextTimeEdgeOK
+		tv, dur = self.videomedia.GetMediaNextInterestingTime(flags, tv, 1.0)
+		dur = self._videotime_to_ms(dur)
+		return int((1000.0/dur)+0.5)
+		
+	def ReadAudio(self, nframes, time=None):
+		if not time is None:
+			self.audiocurtime = time
+		flags = QuickTime.nextTimeStep|QuickTime.nextTimeEdgeOK
+		if self.audiocurtime == None:
+			self.audiocurtime = 0
+		tv = self.audiomedia.GetMediaNextInterestingTimeOnly(flags, self.audiocurtime, 1.0)
+		if tv < 0 or (self.audiocurtime and tv < self.audiocurtime):
+			return self._audiotime_to_ms(self.audiocurtime), None
+		h = Res.Handle('')
+		desc_h = Res.Handle('')
+		size, actualtime, sampleduration, desc_index, actualcount, flags = \
+			self.audiomedia.GetMediaSample(h, 0, tv, desc_h, nframes)
+		self.audiocurtime = actualtime + actualcount*sampleduration
+		return self._audiotime_to_ms(actualtime), h.data
+		
+	def ReadVideo(self, time=None):
+		if not time is None:
+			self.videocurtime = time
+		flags = QuickTime.nextTimeStep
+		if self.videocurtime == None:
+			flags = flags | QuickTime.nextTimeEdgeOK
+			self.videocurtime = 0
+		tv = self.videomedia.GetMediaNextInterestingTimeOnly(flags, self.videocurtime, 1.0)
+		if tv < 0 or (self.videocurtime and tv <= self.videocurtime):
+			return self._videotime_to_ms(self.videocurtime), None
+		self.videocurtime = tv
+		moviecurtime = self._videotime_to_movietime(self.videocurtime)
+		self.movie.SetMovieTimeValue(moviecurtime)
+		self.movie.MoviesTask(0)
+		return self._videotime_to_ms(self.videocurtime), self._getpixmapcontent()
+		
+	def _getpixmapcontent(self):
+		"""Shuffle the offscreen PixMap data, because it may have funny stride values"""
+		rowbytes = Qdoffs.GetPixRowBytes(self.pixmap)
+		width = self.videodescr['width']
+		height = self.videodescr['height']
+		start = 0
+		rv = ''
+		for i in range(height):
+			nextline = Qdoffs.GetPixMapBytes(self.pixmap, start, width*4)
+			start = start + rowbytes
+			rv = rv + nextline
+		return rv
+
+def reader(url):
+	try:
+		rdr = _Reader(url)
+	except IOError:
+		return None
+	return rdr
+
+def _test():
+	import img
+	import MacOS
+	Qt.EnterMovies()
+	fss, ok = macfs.PromptGetFile('Video to convert')
+	if not ok: sys.exit(0)
+	path = fss.as_pathname()
+	rdr = reader(path)
+	if not rdr:
+		sys.exit(1)
+	dstfss, ok = macfs.StandardPutFile('Name for output folder')
+	if not ok: sys.exit(0)
+	dstdir = dstfss.as_pathname()
+	num = 0
+	os.mkdir(dstdir)
+	videofmt = rdr.GetVideoFormat()
+	imgfmt = videofmt.getformat()
+	imgw, imgh = videofmt.getsize()
+	timestamp, data = rdr.ReadVideo()
+	while data:
+		fname = 'frame%04.4d.jpg'%num
+		num = num+1
+		pname = os.path.join(dstdir, fname)
+		print 'Writing', fname, imgw, imgh, len(data)
+		wrt = img.writer(imgfmt, pname)
+		wrt.width = imgw
+		wrt.height = imgh
+		wrt.write(data)
+		timestamp, data = rdr.ReadVideo()
+		MacOS.SetCreatorAndType(pname, 'ogle', 'JPEG')
+		if num > 20: 
+			print 'stopping at 20 frames so your disk does not fill up:-)'
+			break
+	print 'Total frames:', num
+		
+if __name__ == '__main__':
+	_test()
+	sys.exit(1)
+