cpython/Lib/plat-mac/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
from Carbon import Qt
from Carbon import QuickTime
from Carbon import Qd
from Carbon import Qdoffs
from Carbon import QDOffscreen
from Carbon import Res
try:
	import MediaDescr
except ImportError:
	def _audiodescr(data):
		return None
else:
	def _audiodescr(data):
		return MediaDescr.SoundDescription.decode(data)
try:
	from imgformat import macrgb
except ImportError:
	macrgb = "Macintosh RGB format"
import os
# import audio.format

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):
		fd = Qt.OpenMovieFile(path, 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 = _audiodescr(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):
		if not self.audiodescr:
			return None, None, None, None, None
		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):
		if not self.audiodescr:
			return None
		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, 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 EasyDialogs
	try:
		import img
	except ImportError:
		img = None
	import MacOS
	Qt.EnterMovies()
	path = EasyDialogs.AskFileForOpen(message='Video to convert')
	if not path: sys.exit(0)
	rdr = reader(path)
	if not rdr:
		sys.exit(1)
	dstdir = EasyDialogs.AskFileForSave(message='Name for output folder')
	if not dstdir: sys.exit(0)
	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)
		if not img: print 'Not',
		print 'Writing %s, size %dx%d, %d bytes'%(fname, imgw, imgh, len(data))
		if img:
			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)