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wavdumper.py
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wavdumper.py
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import glob
import math
import os
import struct
import sys
"""
Print detailed information on the headers and structure of a WAV file.
Author: Kristian Ovaska <[email protected]>
WWW: http://www.cs.helsinki.fi/u/hkovaska/wavdumper/
License: GNU General Public License
Version: 0.5 (2003-11-13)
See readme.html for details.
"""
NOTES = ['C', 'C#', 'D', 'D#', 'E', 'F', 'F#', 'G', 'G#', 'A', 'A#', 'B']
TEXT_CHUNKS = {
'iarl': 'Archival location',
'iart': 'Artist',
'icms': 'Commissioned',
'icmt': 'Comments',
'icop': 'Copyright',
'icrd': 'Creation date',
'ieng': 'Engineer',
'ignr': 'Genre',
'ikey': 'Keywords',
'inam': 'Name',
'imed': 'Medium',
'iprd': 'Product',
'isbj': 'Subject',
'isft': 'Software',
'isrc': 'Source',
'isrf': 'Original medium',
'itch': 'Technician',
}
# Only reasonably-common formats here; see RFC 2361 for the rest
WAVE_FORMAT = {
0x01: 'Uncompressed PCM',
0x02: 'Microsoft ADPCM',
0x03: 'IEEE Float',
0x06: 'ITU G.711 a-law',
0x07: 'ITU G.711 u-law',
0x11: 'IMA ADPCM',
0x16: 'ITU G.723 ADPCM',
0x31: 'GSM 6.10',
0x40: 'ITU G.721 ADPCM',
0x50: 'MPEG',
0x55: 'MPEG Layer 3',
}
def stripNull(string):
return string.strip('\0')
class Wav:
"""WAV parser and printer. Only printInfo is used outside the class.
Technically, the class is similar to LL(1) parsers. There are read_XYZ
methods that correspond to WAV chunk types. They are defined in
alphabetical order, with assistant methods right after the main method.
A few methods, like read_junk, are used for more than one type of chunk
(junk and pad, in this case).
"""
def __init__(self, filename):
self.filename = filename
def printInfo(self, outfile=None):
"""Read file and print info. Outfile is a file-like object; default
is sys.stdout."""
self.reset()
if outfile:
self.outfile = outfile
if (not os.path.exists(self.filename)) or (not os.path.isfile(self.filename)):
self.p('Could not open %s' % self.filename)
return
try:
# We use open instead of file for backwards compability
self.infile = open(self.filename, 'rb')
except IOError:
self.p('Could not open %s' % self.filename)
return
self.filesize = os.path.getsize(self.filename)
self.p('File: %s (%s bytes)' % (self.filename, self.filesize))
# First, find out if we have a valid WAV file.
if self.filesize<12:
self.p('Not a WAV file')
self.infile.close()
return
id, = struct.unpack('4s', self.read(4))
if id not in [b'RIFF', b'RIFX']:
self.p('Not a WAV file')
self.infile.close()
return
if id=='RIFX':
self.p('File is in big-endian format')
self.endian = '>'
length, rifftype = struct.unpack(self.endian+'i 4s', self.read(8))
if rifftype!=b'WAVE':
self.p('Not a WAV file')
self.infile.close()
return
if length!=self.filesize-8:
self.p('Warning: incorrect RIFF header length (%s)' % length)
# Now, parse the file.
while self.pos()<self.filesize:
self.read_chunk()
if self.pos()!=self.filesize:
self.p('Error: pos!=filesize at end (pos=%s, filesize=%s)' % (self.pos(), self.filesize))
self.infile.close()
def reset(self):
self.infile = None
self.outfile = open(os.devnull, 'w')
self.endian = '<' # default: little-endian, '>' is big-endian
self.indent = 0 # indentation level
self.fmtChunks = 0 # number of fmt chunks
self.dataChunks = 0 # number of data chunks
self.waveFormat = 0
self.sampleRate = 0
self.bytesPerSample = 0
def read(self, bytes):
return self.infile.read(bytes)
def skip(self, bytes):
self.infile.seek(bytes, 1)
def pos(self):
return self.infile.tell()
def p(self, *args):
"""Print args with indentation."""
if self.indent:
self.outfile.write(' ' * self.indent)
for arg in args:
print (arg, file=self.outfile)
print ('\n', file=self.outfile)
def read_chunk(self):
"""Determine chunk type by reading a few bytes and launch a specialized
read_ function. Return bytes read: this is needed by read_list."""
id, length = struct.unpack(self.endian+'4s i', self.read(8))
self.p('Chunk at pos %s: id = "%s", length = %s bytes' % (self.pos(), id, length))
id = id.lower()
methodmap = {
b'cue ': self.read_cue,
b'data': self.read_data,
b'disp': self.read_disp,
b'fact': self.read_fact,
b'fmt ': self.read_fmt,
b'junk': self.read_junk,
b'labl': self.read_labl,
b'ltxt': self.read_ltxt,
b'list': self.read_list,
b'note': self.read_labl,
b'pad ': self.read_junk,
b'plst': self.read_plst,
b'smpl': self.read_smpl,
}
self.indent += 1
if id in methodmap:
f = methodmap[id]
f(length)
elif id in TEXT_CHUNKS: # short iXYZ text chunks
s = stripNull(self.read(length))
self.p('%s: %s' % (TEXT_CHUNKS[id], s))
else:
self.p('Unknown chunk')
self.skip(length)
self.indent -= 1
if length%2 != 0:
self.skip(1) # chunks are word-aligned, but the pad byte isn't counted in length
length += 1
return length+8
### read_ methods for each chunk. ###
def read_cue(self, length):
"""Cue point list chunk."""
points, = struct.unpack(self.endian+'i', self.read(4))
count = 4
self.p('Cue List Chunk')
self.p('Points:', points)
for i in range(points):
self.indent += 1
count += 24
self.read_cuepoint()
self.indent -= 1
if length>count:
self.skip(length-count)
def read_cuepoint(self):
"""Cue point inside cue point list chunk."""
id, position, fccChunk, chunkStart, blockStart, sampleOffset = \
struct.unpack(self.endian+'2i 4s 3i', self.read(24))
self.p('ID: %s, playlist pos: %s, sample offset: %s' % (id, position, sampleOffset))
def read_data(self, length):
"""Sample data chunk."""
if self.dataChunks>0:
self.p('ERROR: too many Data chunks!')
self.dataChunks += 1
self.p('%s bytes sample data' % length)
if self.waveFormat==1:
self.samples = length/self.bytesPerSample
self.p('%s samples' % int(self.samples))
self.p('%.3f seconds' % (float(self.samples)/self.sampleRate))
self.skip(length)
def read_disp(self, length):
"""Some Microsoft(?) thing, couldn't find specs."""
self.p('Disp Chunk')
if length==0:
return
dispType, = struct.unpack(self.endian+'i', self.read(4))
count = 4
if dispType==1:
s = stripNull(self.read(length-count))
count += length-count
self.p('Type: %s, text: %s' % (dispType, s))
elif dispType==8:
self.p('Type: %s, bitmap' % dispType)
else:
self.p('Type:', dispType)
if length>count:
self.skip(length-count)
def read_fact(self, length):
self.p('Fact Chunk')
count = 0
if length>=4:
numberOfSamples, = struct.unpack(self.endian+'i', self.read(4))
self.p('Number of samples in file:', numberOfSamples)
count += 4
if length>count:
self.skip(length-count)
def read_fmt(self, length):
"""Format chunk, basic info about the wave data."""
if self.fmtChunks>0:
self.p('ERROR: too many Format chunks!')
self.fmtChunks += 1
formatTag, self.channels, samplesPerSec, avgBytesPerSec, blockAlign = \
struct.unpack(self.endian+'h H I I H', self.read(14))
count = 14
self.sampleRate = float(samplesPerSec)
self.waveFormat = formatTag
self.p('Format Chunk')
if formatTag in WAVE_FORMAT:
self.p('Data format:', WAVE_FORMAT[formatTag])
else:
self.p('Data format: unknown (%s)' % formatTag)
self.p('Channels:', self.channels)
self.p('Sample rate: %s Hz' % samplesPerSec)
self.p('Average bytes per sec:', avgBytesPerSec)
self.p('Block align (bytes):', blockAlign)
if length>=16:
# bitsPerSample wasn't part of the original WAV specs...
bitsPerSample, = struct.unpack(self.endian+'H', self.read(2))
count += 2
self.p('Bits per sample:', bitsPerSample)
self.bytesPerSample = float(self.channels)*(math.ceil(bitsPerSample/8.0))
else:
# A hack, but should be very rare anyway
self.bytesPerSample = float(blockAlign)
if length>=18:
additionalSize, = struct.unpack(self.endian+'H', self.read(2))
count += 2
if additionalSize>0:
self.p('%s bytes additional space reported' % additionalSize)
if length>count:
self.p('%s bytes additional skipped' % (length-count))
self.skip(length-count)
def read_junk(self, length):
"""Junk chunk, can be used for aligning."""
self.p('Junk/Pad Chunk')
self.skip(length)
def read_labl(self, length):
"""labl or note chunk"""
id, = struct.unpack(self.endian+'i', self.read(4))
self.p('Label/note chunk, id = %s' % id)
if length>4:
s = stripNull(self.read(length-4))
self.p('Text:', s)
else:
self.p('(No text)')
def read_ltxt(self, length):
self.p('Labeled Text Chunk')
id, sampleLength, purporse, country, languange, dialect, codepage = \
struct.unpack(self.endian+'3i 4h', self.read(20))
if length>20:
s = stripNull(self.read(length-20))
self.p('Text:', s)
else:
self.p('(No text)')
def read_list(self, length):
"""List chunk, contains other chunks."""
listType, = struct.unpack(self.endian+'4s', self.read(4))
count = 4
self.p('List Chunk, id = "%s"' % listType)
while count<length-8:
count += self.read_chunk()
if length>count:
self.skip(length-count)
def read_plst(self, length):
"""Playlist chunk."""
segments, = struct.unpack(self.endian+'i', self.read(4))
count = 4
self.p('Playlist Chunk')
self.p('Segments:', segments)
totalLength = 0
for i in range(segments):
self.indent += 1
id, segLength, repeats = struct.unpack('3i', self.read(3*4))
count += 3*4
self.p('ID: %s, length: %s, repeats: %s' % (id, segLength, repeats))
totalLength += segLength*repeats
self.indent -= 1
self.p('Total playing time: %.1f seconds' % (float(totalLength)/self.sampleRate))
if length>count:
self.skip(length-count)
def read_smpl(self, length):
"""Sampler info chunk."""
manufacturer, product, samplePeriod, self.midiUnityNote, midiPitchFraction, smpteFormat, \
smpteOffset, self.sampleLoops, samplerData = struct.unpack(self.endian+'9i', self.read(9*4))
count = 9*4 # read bytes
self.p('Sampler Chunk')
self.p('Manufacturer: %x' % manufacturer)
self.p('Product: %x' % product)
noteStr = '%s-%s' % (NOTES[self.midiUnityNote % 12], self.midiUnityNote/12)
self.p('MIDI note (60=middle-C): %s (%s) +- %.1f%%' % \
(self.midiUnityNote, noteStr, float(midiPitchFraction)/0x80000000))
for i in range(self.sampleLoops):
self.p('Sample loop')
self.indent += 1
self.read_sampleloop(samplerData)
count += 6*4 + samplerData
self.indent -= 1
if length>count:
self.skip(length-count)
def read_sampleloop(self, additional):
"""Sampleloop inside sampler info. additional is the length of
vendor-specific data, which is skipped."""
id, loopType, self.loopstart, self.loopend, fraction, playCount = struct.unpack(self.endian+'6i', self.read(6*4))
self.p('Loop ID:', id)
if loopType==0:
s = 'forward'
elif loopType==1:
s = 'ping pong'
elif loopType==2:
s = 'backward'
elif loopType>=3 and loopType<=31:
s = 'unknown, WAV standard (%s)' % loopType
else:
s = 'device specific (%s)' % loopType
self.p('Type:', s)
self.p('Range: %s - %s' % (self.loopstart, self.loopend))
if playCount==0:
self.p('Repeat: infinity')
else:
self.p('Repeat: %s times' % playCount)
if additional:
self.p('%s bytes additional space skipped' % additional)
self.skip(additional)
########################################################################
def argfiles(args, onlyFiles=False):
"""Expand arguments (globs and non-globs). Return a flat list."""
files = []
for arg in args:
if ('*' in arg) or ('?' in arg):
files.extend(glob.glob(arg))
else:
files.append(arg)
if onlyFiles:
files = filter(os.path.isfile, files)
return files
def main(args):
if not args:
print('Usage: wavdump <files>')
return
files = argfiles(args)
if not files:
print('No matching files found.')
return
wav = Wav(files[0])
wav.printInfo()
for filename in files[1:]:
print()
wav = Wav(filename)
wav.printInfo()
if __name__=='__main__':
main(sys.argv[1:])