VFile: added new formats 'jpeg' and 'jpeggrey'. Decompression is done

using module 'jpeg' by the Displayer class.  (Unfortunately it's too
slow for real time.)  Print file size in printinfo() method.

Vinfo: added -t option (terse -- one line per file) and usage message.

Vtime: use BasicV{in,out}File classes -- the minimum needed.

Vmkjpeg, Vunjpeg: new utilities for jpeg (de)compression.

Demo/sgi/video/README

@@ -24,12 +24,13 @@ editor, not in this directory but in /ufs/guido/mm/.)
 When we got our own Indigo entry-level video board (in June 1992) and
 a version of the Irix video library that supported capturing PAL
 format (in August 1992), Sjoerd added an interface to the video
-library to Python (sv) and Guido wrote Vrec.py (based upon a
+library to Python (sv) and Guido wrote Vrec.py (based upon a still
-still frame grabber by Sjoerd, in turn based upon SGI demo code in C)
+frame grabber by Sjoerd, in turn based upon SGI demo code in C) to
-to record a movie using it.  Vrec was soon followed by modernized
+record a movie using it.  Vrec was soon followed by modernized
 versions of the other programs (Vinfo, Vplay, Vtime) and an
 interactive editor (Vedit).  Finally, VFile was rewritten for more
-modularity, functionality and robustness.
+modularity, functionality and robustness, and various other tools were
+added as needed.
 
 	Guido van Rossum
 	Jack Jansen
@@ -39,7 +40,8 @@ modularity, functionality and robustness.
 Overview of files
 -----------------
 
-cmif-film.ms	description of the CMIF video file format
+cmif-film.ms	description of the CMIF video file format (a little
+		out of date)
 
 
 These are programs with a command line interface:
@@ -55,6 +57,10 @@ Vtime.py	(unrelated to vtime!!!) Copy a video file,
 		manipulating the time codes (e.g. faster/slower, or
 		regenerate time codes, or drop frames too close apart)
 
+Vmkjpeg.py	compress an rgb or grey video file to jpeg[grey] format
+
+Vunjpeg.py	expand a jpeg[grey] video file to rgb or grey format
+
 Vedit.py	interactive video editing program
 
 Vsend.py	unicast or multicast live video as UDP packets

Demo/sgi/video/VFile.py

@@ -69,6 +69,11 @@ def conv_rgb8(rgb, d1, d2):
 	b = (rgb >> 3) & 0x03
 	return (r/7.0, g/7.0, b/3.0)
 
+def conv_jpeg(r, g, b):
+	raise Error, 'Attempt to make RGB colormap (jpeg)'
+
+conv_jpeggrey = conv_grey
+
 
 # Choose one of the above based upon a color system name
 
@@ -107,6 +112,11 @@ def inv_rgb8(r, g, b):
 	rgb = ((r&7) << 5) | ((b&3) << 3) | (g&7)
 	return rgb / 255.0, 0, 0
 
+def inv_jpeg(r, g, b):
+	raise Error, 'Attempt to invert RGB colormap (jpeg)'
+
+inv_jpeggrey = inv_grey
+
 
 # Choose one of the above based upon a color system name
 
@@ -175,6 +185,13 @@ def grab_hls(w, h, pf):
 def grab_hsv(w, h, pf):
 	raise Error, 'Sorry, grabbing hsv not implemented'
 
+def grab_jpeg(w, h, pf):
+	# XXX Ought to grab rgb and compress it
+	raise Error, 'sorry, grabbing jpeg not implemented'
+
+def grab_jpeggrey(w, h, pf):
+	raise Error, 'sorry, grabbing jpeggrey not implemented'
+
 
 # Choose one of the above based upon a color system name
 
@@ -196,7 +213,7 @@ class VideoParams:
 	def init(self):
 		# Essential parameters
 		self.format = 'grey'	# color system used
-		# Choose from: 'rgb', 'rgb8', 'hsv', 'yiq', 'hls'
+		# Choose from: grey, rgb, rgb8, hsv, yiq, hls, jpeg, jpeggrey
 		self.width = 0		# width of frame
 		self.height = 0		# height of frame
 		self.packfactor = 1	# expansion using rectzoom
@@ -286,12 +303,22 @@ class Displayer(VideoParams):
 			  (0,0,self.width,self.height))
 
 	def showpartframe(self, data, chromdata, (x,y,w,h)):
+		pf = self.packfactor
+		if self.format in ('jpeg', 'jpeggrey'):
+			import jpeg
+			data, width, height, bytes = jpeg.decompress(data)
+			if self.format == 'jpeg':
+				b = 4
+			else:
+				b = 1
+				width, height = width*pf, height*pf
+			if (width, height, bytes) <> (w, h, b):
+				raise Error, 'jpeg data has wrong size'
 		if not self.colormapinited:
 			self.initcolormap()
 		if self.fixcolor0:
 			gl.mapcolor(self.color0)
 			self.fixcolor0 = 0
-		pf = self.packfactor
 		factor = self.magnify
 		if pf: factor = factor * pf
 		if chromdata and not self.skipchrom:
@@ -326,7 +353,7 @@ class Displayer(VideoParams):
 		self.colormapinited = 1
 		self.color0 = None
 		self.fixcolor0 = 0
-		if self.format == 'rgb':
+		if self.format in ('rgb', 'jpeg'):
 			gl.RGBmode()
 			gl.gconfig()
 			gl.RGBcolor(200, 200, 200) # XXX rather light grey
@@ -509,11 +536,11 @@ def readfileheader(fp, filename):
 			format, rest = eval(line[:-1])
 		except:
 			raise Error, filename + ': Bad 3.0 color info'
-		if format == 'rgb':
+		if format in ('rgb', 'jpeg'):
 			c0bits = c1bits = c2bits = 0
 			chrompack = 0
 			offset = 0
-		elif format == 'grey':
+		elif format in ('grey', 'jpeggrey'):
 			c0bits = rest
 			c1bits = c2bits = 0
 			chrompack = 0
@@ -606,17 +633,17 @@ def writefileheader(fp, values):
 	#
 	# Write color encoding info
 	#
-	if format == 'rgb':
+	if format in ('rgb', 'jpeg'):
-		data = ('rgb', 0)
+		data = (format, 0)
-	elif format == 'grey':
+	elif format in ('grey', 'jpeggrey'):
-		data = ('grey', c0bits)
+		data = (format, c0bits)
 	else:
 		data = (format, (c0bits, c1bits, c2bits, chrompack, offset))
 	fp.write(`data`+'\n')
 	#
 	# Write frame geometry info
 	#
-	if format == 'rgb':
+	if format in ('rgb', 'jpeg'):
 		packfactor = 0
 	elif packfactor == 0:
 		packfactor = 1
@@ -699,6 +726,7 @@ class BasicVinFile(VideoParams):
 
 	def printinfo(self):
 		print 'File:    ', self.filename
+		print 'Size:    ', getfilesize(self.filename)
 		print 'Version: ', self.version
 		VideoParams.printinfo(self)
 
@@ -765,6 +793,17 @@ class BasicVinFile(VideoParams):
 		self.framecount = self.framecount + 1
 
 
+# Subroutine to return a file's size in bytes
+
+def getfilesize(filename):
+	import os, stat
+	try:
+		st = os.stat(filename)
+		return st[stat.ST_SIZE]
+	except os.error:
+		return 0
+
+
 # Derived class implementing random access and index cached in the file
 
 class RandomVinFile(BasicVinFile):

Demo/sgi/video/Vinfo.py

@@ -20,6 +20,7 @@ import sys
 sys.path.append('/ufs/guido/src/video')
 import VFile
 import getopt
+import string
 
 
 # Global options
@@ -27,22 +28,34 @@ import getopt
 short = 0
 quick = 0
 delta = 0
+terse = 0
+maxwidth = 10
 
 
 # Main program -- mostly command line parsing
 
 def main():
-	global short, quick, delta
+	global short, quick, delta, terse, maxwidth
-	opts, args = getopt.getopt(sys.argv[1:], 'dqs')
+	try:
+		opts, args = getopt.getopt(sys.argv[1:], 'dqst')
+	except getopt.error, msg:
+		sys.stdout = sys.stderr
+		print msg
+		print 'usage: Vinfo [-d] [-q] [-s] [-t] [file] ...'
+		sys.exit(2)
 	for opt, arg in opts:
 		if opt == '-q':
 			quick = 1
-		elif opt == '-d':
+		if opt == '-d':
 			delta = 1
-		elif opt == '-s':
+		if opt == '-s':
 			short = 1
+		if opt == '-t':
+			terse = short = 1
 	if not args:
 		args = ['film.video']
+	for filename in args:
+		maxwidth = max(maxwidth, len(filename))
 	sts = 0
 	for filename in args:
 		if process(filename):
@@ -65,17 +78,31 @@ def process(filename):
 		sys.stderr.write(filename + ': EOF in video file\n')
 		return 1
 
-	vin.printinfo()
+	if terse:
+		print string.ljust(filename, maxwidth),
+		kbytes = (VFile.getfilesize(filename) + 1023) / 1024
+		print string.rjust(`kbytes`, 5) + 'K',
+		print ' ', string.ljust(`vin.version`, 5),
+		print string.ljust(vin.format, 8),
+		print string.rjust(`vin.width`, 4),
+		print string.rjust(`vin.height`, 4),
+		sys.stdout.flush()
+	else:
+		vin.printinfo()
 
 	if quick:
+		if terse:
+			print
 		vin.close()
-		return
+		return 0
 
 	try:
 		vin.readcache()
-		print '[Using cached index]'
+		if not terse:
+			print '[Using cached index]'
 	except VFile.Error:
-		print '[Constructing index on the fly]'
+		if not terse:
+			print '[Constructing index on the fly]'
 
 	if not short:
 		if delta:
@@ -107,16 +134,21 @@ def process(filename):
 
 	if not short: print
 
-	print 'Total', n, 'frames in', t*0.001, 'sec.',
+	if terse:
-	if t: print '-- average', int(n*10000.0/t)*0.1, 'frames/sec',
+		print string.rjust(`n`, 6),
-	print
+		print string.rjust(`int(n*10000.0/t)*0.1`, 5)
-	print 'Total data', 0.1 * int(datasize / 102.4), 'Kbytes',
+	else:
-	if t:
+		print 'Total', n, 'frames in', t*0.001, 'sec.',
-		print '-- average',
+		if t: print '-- average', int(n*10000.0/t)*0.1, 'frames/sec',
-		print 0.1 * int(datasize / 0.1024 / t), 'Kbytes/sec',
+		print
-	print
+		print 'Total data', 0.1 * int(datasize / 102.4), 'Kbytes',
+		if t:
+			print '-- average',
+			print 0.1 * int(datasize / 0.1024 / t), 'Kbytes/sec',
+		print
 
 	vin.close()
+	return 0
 
 
 # Don't forget to call the main program

Demo/sgi/video/Vmkjpeg.py

@@ -0,0 +1,92 @@
+#!/ufs/guido/bin/sgi/python
+
+# Compress an rgb or grey video file to jpeg format
+
+
+# Usage:
+#
+# Vmkjpeg [infile [outfile]]
+
+
+# Options:
+#
+# infile     : input file (default film.video)
+# outfile    : output file (default out.video)
+
+
+import sys
+import jpeg
+sys.path.append('/ufs/guido/src/video')
+import VFile
+
+
+# Main program -- mostly command line parsing
+
+def main():
+	args = sys.argv[1:]
+	if len(args) < 1:
+		args.append('film.video')
+	if len(args) < 2:
+		args.append('out.video')
+	if len(args) > 2:
+		sys.stderr.write('usage: Vmkjpeg [infile [outfile]]\n')
+		sys.exit(2)
+	sts = process(args[0], args[1])
+	sys.exit(sts)
+
+
+# Copy one file to another
+
+def process(infilename, outfilename):
+	try:
+		vin = VFile.BasicVinFile().init(infilename)
+	except IOError, msg:
+		sys.stderr.write(infilename + ': I/O error: ' + `msg` + '\n')
+		return 1
+	except VFile.Error, msg:
+		sys.stderr.write(msg + '\n')
+		return 1
+	except EOFError:
+		sys.stderr.write(infilename + ': EOF in video file\n')
+		return 1
+
+	try:
+		vout = VFile.BasicVoutFile().init(outfilename)
+	except IOError, msg:
+		sys.stderr.write(outfilename + ': I/O error: ' + `msg` + '\n')
+		return 1
+
+	info = vin.getinfo()
+	if info[0] == 'rgb':
+		width, height = vin.getsize()
+		bytes = 4
+		format = 'jpeg'
+	elif info[0] == 'grey':
+		width, height = vin.getsize()
+		pf = vin.packfactor
+		width, height = width / pf, height / pf
+		bytes = 1
+		format = 'jpeggrey'
+	else:
+		sys.stderr.write('Vmkjpeg: input not in rgb or grey format\n')
+		return 1
+	info = (format,) + info[1:]
+	vout.setinfo(info)
+	vout.writeheader()
+	n = 0
+	try:
+		while 1:
+			t, data, cdata = vin.getnextframe()
+			n = n + 1
+			sys.stderr.write('Frame ' + `n` + '...')
+			data = jpeg.compress(data, width, height, bytes)
+			vout.writeframe(t, data, None)
+			sys.stderr.write('\n')
+	except EOFError:
+		pass
+	return 0
+
+
+# Don't forget to call the main program
+
+main()

Demo/sgi/video/Vtime.py

@@ -65,7 +65,7 @@ def main():
 
 def process(infilename, outfilename):
 	try:
-		vin = VFile.VinFile().init(infilename)
+		vin = VFile.BasicVinFile().init(infilename)
 	except IOError, msg:
 		sys.stderr.write(infilename + ': I/O error: ' + `msg` + '\n')
 		return 1
@@ -77,7 +77,7 @@ def process(infilename, outfilename):
 		return 1
 
 	try:
-		vout = VFile.VoutFile().init(outfilename)
+		vout = VFile.BasicVoutFile().init(outfilename)
 	except IOError, msg:
 		sys.stderr.write(outfilename + ': I/O error: ' + `msg` + '\n')
 		return 1

Demo/sgi/video/Vunjpeg.py

@@ -0,0 +1,97 @@
+#!/ufs/guido/bin/sgi/python
+
+# Decompress a jpeg or jpeggrey video file to rgb format
+
+
+# Usage:
+#
+# Vunjpeg [infile [outfile]]
+
+
+# Options:
+#
+# infile     : input file (default film.video)
+# outfile    : output file (default out.video)
+
+
+import sys
+import jpeg
+sys.path.append('/ufs/guido/src/video')
+import VFile
+
+
+# Main program -- mostly command line parsing
+
+def main():
+	args = sys.argv[1:]
+	if len(args) < 1:
+		args.append('film.video')
+	if len(args) < 2:
+		args.append('out.video')
+	if len(args) > 2:
+		sys.stderr.write('usage: Vunjpeg [infile [outfile]]\n')
+		sys.exit(2)
+	sts = process(args[0], args[1])
+	sys.exit(sts)
+
+
+# Copy one file to another
+
+def process(infilename, outfilename):
+	try:
+		vin = VFile.BasicVinFile().init(infilename)
+	except IOError, msg:
+		sys.stderr.write(infilename + ': I/O error: ' + `msg` + '\n')
+		return 1
+	except VFile.Error, msg:
+		sys.stderr.write(msg + '\n')
+		return 1
+	except EOFError:
+		sys.stderr.write(infilename + ': EOF in video file\n')
+		return 1
+
+	try:
+		vout = VFile.BasicVoutFile().init(outfilename)
+	except IOError, msg:
+		sys.stderr.write(outfilename + ': I/O error: ' + `msg` + '\n')
+		return 1
+
+	info = vin.getinfo()
+	if info[0] == 'jpeg':
+		format = 'rgb'
+		width, height = vin.getsize()
+		bytes = 4
+	elif info[0] == 'jpeggrey':
+		format = 'grey'
+		width, height = vin.getsize()
+		pf = vin.packfactor
+		width, height = width/pf, height/pf
+		bytes = 1
+	else:
+		sys.stderr.write('Vunjpeg: input not in jpeg[grey] format\n')
+		return 1
+	info = (format,) + info[1:]
+	vout.setinfo(info)
+	vout.writeheader()
+	sts = 0
+	n = 0
+	try:
+		while 1:
+			t, data, cdata = vin.getnextframe()
+			n = n + 1
+			sys.stderr.write('Frame ' + `n` + '...')
+			data, w, h, b = jpeg.decompress(data)
+			if (w, h, b) <> (width, height, bytes):
+				sys.stderr.write('jpeg data has wrong size\n')
+				sts = 1
+			else:
+				vout.writeframe(t, data, None)
+				sys.stderr.write('\n')
+	except EOFError:
+		pass
+	return sts
+
+
+# Don't forget to call the main program
+
+main()