Initial revision

Demo/sgi/al/playaiff.py

@@ -0,0 +1,54 @@
+import aiff
+import al
+import sys
+import time
+
+def main():
+	v = 1
+	c = al.newconfig()
+	nchannels = c.getchannels()
+	nsampframes = 0 # ???
+	sampwidth = c.getwidth()
+	samprate = 0.0 # unknown
+	filename = sys.argv[1]
+	f = open(filename, 'r')
+	type, totalsize = aiff.read_chunk_header(f)
+	if type <> 'FORM':
+		raise aiff.Error, 'FORM chunk expected at start of file'
+	aiff.read_form_chunk(f)
+	while 1:
+		try:
+			type, size = aiff.read_chunk_header(f)
+		except EOFError:
+			break
+		if v: print 'header:', `type`, size
+		if type = 'COMM':
+			nchannels, nsampframes, sampwidth, samprate = \
+				aiff.read_comm_chunk(f)
+			if v: print nchannels, nsampframes, sampwidth, samprate
+		elif type = 'SSND':
+			offset, blocksize = aiff.read_ssnd_chunk(f)
+			if v: print offset, blocksize
+			data = f.read(size-8)
+			if size%2: void = f.read(1)
+			p = makeport(nchannels, sampwidth, samprate)
+			play(p, data, offset, blocksize)
+		elif type in aiff.skiplist:
+			aiff.skip_chunk(f, size)
+		else:
+			raise aiff.Error, 'bad chunk type ' + type
+
+def makeport(nchannels, sampwidth, samprate):
+	c = al.newconfig()
+	c.setchannels(nchannels)
+	c.setwidth(sampwidth/8)
+	# can't set the rate...
+	p = al.openport('', 'w', c)
+	return p
+
+def play(p, data, offset, blocksize):
+	data = data[offset:]
+	p.writesamps(data)
+	while p.getfilled() > 0: time.millisleep(10)
+
+main()