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
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)