vrecb.py

reduced python source for embedded apps

#! /usr/bin/env python

# Capture a CMIF movie using the Indigo video library and board in burst mode


# User interface:
#
# Start the application.  Resize the window to the desired movie size.
# Press the left mouse button to start recording, release it to end
# recording.  You can record as many times as you wish, but each time
# you overwrite the output file(s), so only the last recording is
# kept.
#
# Press ESC or select the window manager Quit or Close window option
# to quit.  If you quit before recording anything, the output file(s)
# are not touched.


import sys
sys.path.append('/ufs/guido/src/video')
import sv, SV
import VFile
import gl, GL, DEVICE
import al, AL
import time
import posix
import getopt
import string
import imageop
import sgi


# Usage and help functions (keep this up-to-date if you change the program!)

def usage():
	print 'Usage: Vrecb [options] [moviefile [audiofile]]'
	print
	print 'Options:'
	print '-a            : record audio as well'
	print '-r rate       : capture 1 out of every "rate" frames', \
	                     '(default and min 1)'
	print '-w width      : initial window width', \
                             '(default 256, use 0 for interactive placement)'
	print '-d            : drop fields if needed'
	print '-g bits       : greyscale (2, 4 or 8 bits)'
	print '-G            : 2-bit greyscale dithered'
	print '-m            : monochrome dithered'
	print '-M value      : monochrome tresholded with value'
	print '-f            : Capture fields (instead of frames)'
	print '-n number     : Capture this many frames (default 60)'
	print '-N memsize    : Capture frames fitting in this many kbytes'
	print 'moviefile     : here goes the movie data (default film.video)'

def help():
	print 'Press the left mouse button to start recording.'
	print 'Recording time is determined by the -n option.'
	print 'You can record as many times as you wish, but each'
	print 'recording overwrites the output file(s) -- only the'
	print 'last recording is kept.'
	print
	print 'Press ESC or use the window manager Quit or Close window option'
	print 'to quit.  If you quit before recording anything, the output'
	print 'file(s) are not touched.'


# Main program

def main():
	format = SV.RGB8_FRAMES
	audio = 0
	rate = 1
	width = 256
	drop = 0
	mono = 0
	grey = 0
	greybits = 0
	monotreshold = -1
	fields = 0
	number = 0
	memsize = 0

	try:
		opts, args = getopt.getopt(sys.argv[1:], 'ar:w:dg:mM:Gfn:N:')
	except getopt.error, msg:
		sys.stdout = sys.stderr
		print 'Error:', msg, '\n'
		usage()
		sys.exit(2)

	try:
		for opt, arg in opts:
			if opt == '-a':
				audio = 1
			if opt == '-r':
				rate = string.atoi(arg)
				if rate < 1:
				    sys.stderr.write('-r rate must be >= 1\n')
				    sys.exit(2)
			elif opt == '-w':
				width = string.atoi(arg)
			elif opt == '-d':
				drop = 1
			elif opt == '-g':
				grey = 1
				greybits = string.atoi(arg)
				if not greybits in (2,4,8):
				    sys.stderr.write( \
				    'Only 2, 4 or 8 bit greyscale supported\n')
				    sys.exit(2)
			elif opt == '-G':
				grey = 1
				greybits = -2
			elif opt == '-m':
				mono = 1
			elif opt == '-M':
				mono = 1
				monotreshold = string.atoi(arg)
			elif opt == '-f':
				fields = 1
			elif opt == '-n':
				number = string.atoi(arg)
			elif opt == '-N':
				memsize = string.atoi(arg)
				if 0 < memsize < 1024:
					memsize = memsize * 1024
				if 0 < memsize < 1024*1024:
					memsize = memsize * 1024
				print 'memsize', memsize
	except string.atoi_error:
		sys.stdout = sys.stderr
		print 'Option', opt, 'requires integer argument'
		sys.exit(2)

	if number <> 0 and memsize <> 0:
		sys.stderr.write('-n and -N are mutually exclusive\n')
		sys.exit(2)
	if number == 0 and memsize == 0:
		number = 60

	if not fields:
		print '-f option assumed until somebody fixes it'
		fields = 1

	if args[2:]:
		sys.stderr.write('usage: Vrecb [options] [file [audiofile]]\n')
		sys.exit(2)

	if args:
		filename = args[0]
	else:
		filename = 'film.video'

	if args[1:] and not audio:
		sys.stderr.write('-a turned on by appearance of 2nd file\n')
		audio = 1

	if audio:
		if args[1:]:
			audiofilename = args[1]
		else:
			audiofilename = 'film.aiff'
	else:
		audiofilename = None

	v = sv.OpenVideo()
	# Determine maximum window size based on signal standard
	param = [SV.BROADCAST, 0]
	v.GetParam(param)
	if param[1] == SV.PAL:
		x = SV.PAL_XMAX
		y = SV.PAL_YMAX
	elif param[1] == SV.NTSC:
		x = SV.NTSC_XMAX
		y = SV.NTSC_YMAX
	else:
		print 'Unknown video standard', param[1]
		sys.exit(1)

	gl.foreground()
	gl.maxsize(x, y)
	gl.keepaspect(x, y)
	gl.stepunit(8, 6)
	if width:
		height = width*3/4
		x1 = 150
		x2 = x1 + width-1
		y2 = 768-150
		y1 = y2-height+1
		gl.prefposition(x1, x2, y1, y2)
	win = gl.winopen(filename)
	if width:
		gl.maxsize(x, y)
		gl.keepaspect(x, y)
		gl.stepunit(8, 6)
		gl.winconstraints()
	x, y = gl.getsize()
	print x, 'x', y
	if memsize:
		number = calcnumber(x, y, grey or mono, memsize)
		print number, 'frames'
	v.SetSize(x, y)

	if drop:
		param = [SV.FIELDDROP, 1, SV.GENLOCK, SV.GENLOCK_OFF]
	else:
		param = [SV.FIELDDROP, 0, SV.GENLOCK, SV.GENLOCK_ON]
	if mono or grey:
		param = param+[SV.COLOR, SV.MONO, SV.DITHER, 0, \
			       SV.INPUT_BYPASS, 1]
	else:
		param = param+[SV.COLOR, SV.DEFAULT_COLOR, SV.INPUT_BYPASS, 0]

	v.BindGLWindow(win, SV.IN_REPLACE)
	v.SetParam(param)

	gl.qdevice(DEVICE.LEFTMOUSE)
	gl.qdevice(DEVICE.WINQUIT)
	gl.qdevice(DEVICE.WINSHUT)
	gl.qdevice(DEVICE.ESCKEY)

	help()

	while 1:
		dev, val = gl.qread()
		if dev == DEVICE.LEFTMOUSE:
			if val == 1:
				info = format, x, y, number, rate
				record(v, info, filename, audiofilename, \
					  mono, grey, \
					  greybits, monotreshold, fields)
		elif dev == DEVICE.REDRAW:
			# Window resize (or move)
			x, y = gl.getsize()
			print x, 'x', y
			if memsize:
			    number = calcnumber(x, y, grey or mono, memsize)
			    print number, 'frames'
			v.SetSize(x, y)
			v.BindGLWindow(win, SV.IN_REPLACE)
		elif dev in (DEVICE.ESCKEY, DEVICE.WINQUIT, DEVICE.WINSHUT):
			# Quit
			v.CloseVideo()
			gl.winclose(win)
			break


def calcnumber(x, y, grey, memsize):
	pixels = x*y
	pixels = pixels/2		# XXX always assume fields
	if grey: n = memsize/pixels
	else: n = memsize/(4*pixels)
	return max(1, n)


# Record until the mouse is released (or any other GL event)
# XXX audio not yet supported

def record(v, info, filename, audiofilename, \
	               mono, grey, greybits, monotreshold, fields):
	import thread
	format, x, y, number, rate = info
	fps = 59.64 # Fields per second
	# XXX (Strange: need fps of Indigo monitor, not of PAL or NTSC!)
	tpf = 1000.0 / fps # Time per field in msec
	#
	# Go grab
	#
	if audiofilename:
		gl.wintitle('(start audio) ' + filename)
		audiodone = thread.allocate_lock()
		audiodone.acquire_lock()
		audiostart = thread.allocate_lock()
		audiostart.acquire_lock()
		audiostop = []
		initaudio(audiofilename, audiostop, audiostart, audiodone)
		audiostart.acquire_lock()
	gl.wintitle('(rec) ' + filename)
	try:
		ninfo, data, bitvec = v.CaptureBurst(info)
	except sv.error, arg:
		print 'CaptureBurst failed:', arg
		print 'info:', info
		gl.wintitle(filename)
		return
	gl.wintitle('(save) '+ filename)
	#
	# Check results
	#
	if info <> ninfo:
		print 'Sorry, format changed.'
		print 'Wanted:',info
		print 'Got   :',ninfo
		gl.wintitle(filename)
		return
	# print bitvec
	if x*y*number <> len(data):
		print 'Funny data length: wanted',x,'*',y,'*', number,'=',\
			  x*y*number,'got',len(data)
		gl.wintitle(filename)
		return
	#
	# Save
	#
	if filename and audiofilename:
		audiostop.append(None)
		audiodone.acquire_lock()
	if filename:
		#
		# Construct header and write it
		#
		try:
			vout = VFile.VoutFile(filename)
		except IOError, msg:
			print filename, ':', msg
			sys.exit(1)
		if mono:
			vout.format = 'mono'
		elif grey and greybits == 8:
			vout.format = 'grey'
		elif grey:
			vout.format = 'grey'+`abs(greybits)`
		else:
			vout.format = 'rgb8'
		vout.width = x
		vout.height = y
		if fields:
			vout.packfactor = (1,-2)
		else:
			print 'Sorry, can only save fields at the moment'
			print '(i.e. you *must* use the -f option)'
			gl.wintitle(filename)
			return
		vout.writeheader()
		#
		# Compute convertor, if needed
		#
		convertor = None
		if grey:
			if greybits == 2:
				convertor = imageop.grey2grey2
			elif greybits == 4:
				convertor = imageop.grey2grey4
			elif greybits == -2:
				convertor = imageop.dither2grey2
		fieldsize = x*y/2
		nskipped = 0
		realframeno = 0
		tpf = 1000 / 50.0     #XXXX
		# Trying to find the pattern in frame skipping
		okstretch = 0
		skipstretch = 0
		for frameno in range(0, number*2):
			if frameno <> 0 and \
				  bitvec[frameno] == bitvec[frameno-1]:
				nskipped = nskipped + 1
				if okstretch:
					print okstretch, 'ok',
					okstretch = 0
				skipstretch = skipstretch + 1
				continue
			if skipstretch:
				print skipstretch, 'skipped'
				skipstretch = 0
			okstretch = okstretch + 1
			#
			# Save field.
			# XXXX Works only for fields and top-to-bottom
			#
			start = frameno*fieldsize
			field = data[start:start+fieldsize]
			if convertor:
				field = convertor(field, len(field), 1)
			elif mono and monotreshold >= 0:
				field = imageop.grey2mono( \
					  field, len(field), 1, monotreshold)
			elif mono:
				field = imageop.dither2mono( \
					  field, len(field), 1)
			realframeno = realframeno + 1
			vout.writeframe(int(realframeno*tpf), field, None)
		print okstretch, 'ok',
		print skipstretch, 'skipped'
		print 'Skipped', nskipped, 'duplicate frames'
		vout.close()
			
	gl.wintitle('(done) ' + filename)
# Initialize audio recording

AQSIZE = 8*8000 # XXX should be a user option

def initaudio(filename, stop, start, done):
	import thread, aifc
	afile = aifc.open(filename, 'w')
	afile.setnchannels(AL.MONO)
	afile.setsampwidth(AL.SAMPLE_8)
	params = [AL.INPUT_RATE, 0]
	al.getparams(AL.DEFAULT_DEVICE, params)
	print 'audio sampling rate =', params[1]
	afile.setframerate(params[1])
	c = al.newconfig()
	c.setchannels(AL.MONO)
	c.setqueuesize(AQSIZE)
	c.setwidth(AL.SAMPLE_8)
	aport = al.openport(filename, 'r', c)
	thread.start_new_thread(audiorecord, (afile, aport, stop, start, done))


# Thread to record audio samples

def audiorecord(afile, aport, stop, start, done):
	start.release_lock()
	leeway = 4
	while leeway > 0:
		if stop:
			leeway = leeway - 1
		data = aport.readsamps(AQSIZE/8)
		afile.writesampsraw(data)
		del data
	afile.close()
	print 'Done writing audio'
	done.release_lock()


# Don't forget to call the main program

try:
	main()
except KeyboardInterrupt:
	print '[Interrupt]'