aifc, sunau: make rate an int; os: restruct; ospath: obsolete; rfc822:
date and addr parsing; string: force result of atof to float and support atoi, atol, atof in strop; tzparcs: don't call test().
This commit is contained in:
Guido van Rossum
parent
e1056b3c32
commit
3ed23cc158
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# Module 'dospath' -- common operations on DOS pathnames
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import os
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import stat
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import string
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# Normalize the case of a pathname.
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# On MS-DOS it maps the pathname to lowercase, turns slashes into
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# backslashes and maps invalid consecutive characters to a single '_'.
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# Other normalizations (such as optimizing '../' away) are not allowed
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# (this is done by normpath).
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mapchar = '_'
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def normcase(s):
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res, s = splitdrive(s)
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for c in s:
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if c in '/\\':
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res = res + os.sep
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elif c == '.' and res[-1:] == os.sep:
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res = res + mapchar + c
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elif ord(c) < 32 or c in ' "*+,:;<=>?[]|':
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if res[-1:] != mapchar:
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res = res + mapchar
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else:
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res = res + c
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return string.lower(res)
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# Return wheter a path is absolute.
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# Trivial in Posix, harder on the Mac or MS-DOS.
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# For DOS it is absolute if it starts with a slash or backslash (current
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# volume), or if a pathname after the volume letter and colon starts with
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# a slash or backslash.
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def isabs(s):
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s = splitdrive(s)[1]
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return s != '' and s[:1] in '/\\'
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# Join two pathnames.
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# Ignore the first part if the second part is absolute.
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# Insert a '/' unless the first part is empty or already ends in '/'.
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def join(a, b):
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if isabs(b): return b
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if a == '' or a[-1:] in '/\\': return a + b
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# Note: join('x', '') returns 'x/'; is this what we want?
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return a + os.sep + b
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# Split a path in a drive specification (a drive letter followed by a
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# colon) and the path specification.
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# It is always true that drivespec + pathspec == p
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def splitdrive(p):
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if p[1:2] == ':':
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return p[0:2], p[2:]
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return '', p
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# Split a path in head (everything up to the last '/') and tail (the
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# rest). If the original path ends in '/' but is not the root, this
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# '/' is stripped. After the trailing '/' is stripped, the invariant
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# join(head, tail) == p holds.
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# The resulting head won't end in '/' unless it is the root.
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def split(p):
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d, p = splitdrive(p)
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slashes = ''
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while p and p[-1:] in '/\\':
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slashes = slashes + p[-1]
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p = p[:-1]
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if p == '':
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p = p + slashes
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head, tail = '', ''
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for c in p:
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tail = tail + c
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if c in '/\\':
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head, tail = head + tail, ''
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slashes = ''
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while head and head[-1:] in '/\\':
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slashes = slashes + head[-1]
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head = head[:-1]
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if head == '':
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head = head + slashes
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return d + head, tail
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# Split a path in root and extension.
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# The extension is everything starting at the first dot in the last
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# pathname component; the root is everything before that.
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# It is always true that root + ext == p.
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def splitext(p):
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root, ext = '', ''
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for c in p:
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if c in '/\\':
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root, ext = root + ext + c, ''
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elif c == '.' or ext:
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ext = ext + c
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else:
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root = root + c
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return root, ext
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# Return the tail (basename) part of a path.
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def basename(p):
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return split(p)[1]
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# Return the head (dirname) part of a path.
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def dirname(p):
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return split(p)[0]
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# Return the longest prefix of all list elements.
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def commonprefix(m):
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if not m: return ''
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prefix = m[0]
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for item in m:
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for i in range(len(prefix)):
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if prefix[:i+1] <> item[:i+1]:
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prefix = prefix[:i]
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if i == 0: return ''
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break
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return prefix
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# Is a path a symbolic link?
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# This will always return false on systems where posix.lstat doesn't exist.
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def islink(path):
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return false
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# Does a path exist?
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# This is false for dangling symbolic links.
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def exists(path):
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try:
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st = os.stat(path)
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except os.error:
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return 0
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return 1
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# Is a path a dos directory?
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# This follows symbolic links, so both islink() and isdir() can be true
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# for the same path.
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def isdir(path):
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try:
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st = os.stat(path)
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except os.error:
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return 0
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return stat.S_ISDIR(st[stat.ST_MODE])
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# Is a path a regular file?
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# This follows symbolic links, so both islink() and isdir() can be true
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# for the same path.
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def isfile(path):
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try:
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st = os.stat(path)
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except os.error:
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return 0
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return stat.S_ISREG(st[stat.ST_MODE])
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# Are two filenames really pointing to the same file?
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def samefile(f1, f2):
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s1 = os.stat(f1)
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s2 = os.stat(f2)
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return samestat(s1, s2)
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# Are two open files really referencing the same file?
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# (Not necessarily the same file descriptor!)
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# XXX THIS IS BROKEN UNDER DOS! ST_INO seems to indicate number of reads?
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def sameopenfile(fp1, fp2):
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s1 = os.fstat(fp1.fileno())
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s2 = os.fstat(fp2.fileno())
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return samestat(s1, s2)
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# Are two stat buffers (obtained from stat, fstat or lstat)
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# describing the same file?
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def samestat(s1, s2):
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return s1[stat.ST_INO] == s2[stat.ST_INO] and \
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s1[stat.ST_DEV] == s2[stat.ST_DEV]
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# Is a path a mount point?
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# XXX This degenerates in: 'is this the root?' on DOS
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def ismount(path):
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return isabs(splitdrive(path)[1])
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# Directory tree walk.
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# For each directory under top (including top itself, but excluding
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# '.' and '..'), func(arg, dirname, filenames) is called, where
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# dirname is the name of the directory and filenames is the list
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# files files (and subdirectories etc.) in the directory.
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# The func may modify the filenames list, to implement a filter,
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# or to impose a different order of visiting.
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def walk(top, func, arg):
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try:
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names = os.listdir(top)
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except os.error:
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return
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func(arg, top, names)
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exceptions = ('.', '..')
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for name in names:
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if name not in exceptions:
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name = join(top, name)
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if isdir(name):
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walk(name, func, arg)
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# Expand paths beginning with '~' or '~user'.
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# '~' means $HOME; '~user' means that user's home directory.
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# If the path doesn't begin with '~', or if the user or $HOME is unknown,
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# the path is returned unchanged (leaving error reporting to whatever
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# function is called with the expanded path as argument).
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# See also module 'glob' for expansion of *, ? and [...] in pathnames.
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# (A function should also be defined to do full *sh-style environment
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# variable expansion.)
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def expanduser(path):
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if path[:1] <> '~':
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return path
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i, n = 1, len(path)
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while i < n and path[i] not in '/\\':
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i = i+1
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if i == 1:
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if not os.environ.has_key('HOME'):
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return path
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userhome = os.environ['HOME']
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else:
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return path
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return userhome + path[i:]
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# Expand paths containing shell variable substitutions.
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# The following rules apply:
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# - no expansion within single quotes
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# - no escape character, except for '$$' which is translated into '$'
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# - ${varname} is accepted.
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# - varnames can be made out of letters, digits and the character '_'
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# XXX With COMMAND.COM you can use any characters in a variable name,
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# XXX except '^|<>='.
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varchars = string.letters + string.digits + '_-'
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def expandvars(path):
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if '$' not in path:
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return path
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res = ''
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index = 0
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pathlen = len(path)
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while index < pathlen:
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c = path[index]
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if c == '\'': # no expansion within single quotes
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path = path[index + 1:]
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pathlen = len(path)
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try:
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index = string.index(path, '\'')
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res = res + '\'' + path[:index + 1]
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except string.index_error:
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res = res + path
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index = pathlen -1
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elif c == '$': # variable or '$$'
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if path[index + 1:index + 2] == '$':
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res = res + c
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index = index + 1
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elif path[index + 1:index + 2] == '{':
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path = path[index+2:]
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pathlen = len(path)
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try:
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index = string.index(path, '}')
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var = path[:index]
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if os.environ.has_key(var):
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res = res + os.environ[var]
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except string.index_error:
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res = res + path
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index = pathlen - 1
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else:
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var = ''
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index = index + 1
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c = path[index:index + 1]
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while c != '' and c in varchars:
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var = var + c
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index = index + 1
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c = path[index:index + 1]
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if os.environ.has_key(var):
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res = res + os.environ[var]
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if c != '':
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res = res + c
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else:
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res = res + c
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index = index + 1
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return res
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# Normalize a path, e.g. A//B, A/./B and A/foo/../B all become A/B.
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# Also, components of the path are silently truncated to 8+3 notation.
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def normpath(path):
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path = normcase(path)
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prefix, path = splitdrive(path)
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while path[:1] == os.sep:
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prefix = prefix + os.sep
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path = path[1:]
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comps = string.splitfields(path, os.sep)
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i = 0
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while i < len(comps):
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if comps[i] == '.':
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del comps[i]
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elif comps[i] == '..' and i > 0 and \
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comps[i-1] not in ('', '..'):
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del comps[i-1:i+1]
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i = i-1
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elif comps[i] == '' and i > 0 and comps[i-1] <> '':
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del comps[i]
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elif '.' in comps[i]:
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comp = string.splitfields(comps[i], '.')
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comps[i] = comp[0][:8] + '.' + comp[1][:3]
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i = i+1
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elif len(comps[i]) > 8:
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comps[i] = comps[i][:8]
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i = i+1
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else:
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i = i+1
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# If the path is now empty, substitute '.'
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if not prefix and not comps:
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comps.append('.')
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return prefix + string.joinfields(comps, os.sep)
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@ -0,0 +1,559 @@
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# Stuff to parse WAVE files.
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#
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# Usage.
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#
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# Reading WAVE files:
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# f = wave.open(file, 'r')
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# where file is either the name of a file or an open file pointer.
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# The open file pointer must have methods read(), seek(), and close().
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# When the setpos() and rewind() methods are not used, the seek()
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# method is not necessary.
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#
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# This returns an instance of a class with the following public methods:
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# getnchannels() -- returns number of audio channels (1 for
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# mono, 2 for stereo)
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# getsampwidth() -- returns sample width in bytes
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# getframerate() -- returns sampling frequency
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# getnframes() -- returns number of audio frames
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# getcomptype() -- returns compression type ('NONE' for AIFF files)
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# getcompname() -- returns human-readable version of
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# compression type ('not compressed' for AIFF files)
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# getparams() -- returns a tuple consisting of all of the
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# above in the above order
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# getmarkers() -- returns None (for compatibility with the
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# aifc module)
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# getmark(id) -- raises an error since the mark does not
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# exist (for compatibility with the aifc module)
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# readframes(n) -- returns at most n frames of audio
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# rewind() -- rewind to the beginning of the audio stream
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# setpos(pos) -- seek to the specified position
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# tell() -- return the current position
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# close() -- close the instance (make it unusable)
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# The position returned by tell() and the position given to setpos()
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# are compatible and have nothing to do with the actual postion in the
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# file.
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# The close() method is called automatically when the class instance
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# is destroyed.
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#
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# Writing WAVE files:
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# f = wave.open(file, 'w')
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# where file is either the name of a file or an open file pointer.
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# The open file pointer must have methods write(), tell(), seek(), and
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# close().
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#
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# This returns an instance of a class with the following public methods:
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# setnchannels(n) -- set the number of channels
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# setsampwidth(n) -- set the sample width
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# setframerate(n) -- set the frame rate
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# setnframes(n) -- set the number of frames
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# setcomptype(type, name)
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# -- set the compression type and the
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# human-readable compression type
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# setparams(nchannels, sampwidth, framerate, nframes, comptype, compname)
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# -- set all parameters at once
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# tell() -- return current position in output file
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# writeframesraw(data)
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# -- write audio frames without pathing up the
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# file header
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# writeframes(data)
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# -- write audio frames and patch up the file header
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# close() -- patch up the file header and close the
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# output file
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||||
# You should set the parameters before the first writeframesraw or
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# writeframes. The total number of frames does not need to be set,
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# but when it is set to the correct value, the header does not have to
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# be patched up.
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# It is best to first set all parameters, perhaps possibly the
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# compression type, and then write audio frames using writeframesraw.
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||||
# When all frames have been written, either call writeframes('') or
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||||
# close() to patch up the sizes in the header.
|
||||
# The close() method is called automatically when the class instance
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||||
# is destroyed.
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||||
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||||
import __builtin__
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Error = 'wave.Error'
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||||
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||||
WAVE_FORMAT_PCM = 0x0001
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||||
|
||||
_array_fmts = None, 'b', 'h', None, 'l'
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||||
|
||||
def _read_long(file):
|
||||
x = 0L
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||||
for i in range(4):
|
||||
byte = file.read(1)
|
||||
if byte == '':
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||||
raise EOFError
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||||
x = x + (ord(byte) << (8 * i))
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||||
if x >= 0x80000000L:
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x = x - 0x100000000L
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return int(x)
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||||
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||||
def _read_ulong(file):
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||||
x = 0L
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||||
for i in range(4):
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||||
byte = file.read(1)
|
||||
if byte == '':
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||||
raise EOFError
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||||
x = x + (ord(byte) << (8 * i))
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return x
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||||
|
||||
def _read_short(file):
|
||||
x = 0
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for i in range(2):
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||||
byte = file.read(1)
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||||
if byte == '':
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||||
raise EOFError
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||||
x = x + (ord(byte) << (8 * i))
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||||
if x >= 0x8000:
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||||
x = x - 0x10000
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||||
return x
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||||
|
||||
def _write_short(f, x):
|
||||
d, m = divmod(x, 256)
|
||||
f.write(chr(m))
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||||
f.write(chr(d))
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||||
|
||||
def _write_long(f, x):
|
||||
if x < 0:
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||||
x = x + 0x100000000L
|
||||
for i in range(4):
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d, m = divmod(x, 256)
|
||||
f.write(chr(int(m)))
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x = d
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||||
|
||||
class Chunk:
|
||||
def __init__(self, file):
|
||||
self.file = file
|
||||
self.chunkname = self.file.read(4)
|
||||
if len(self.chunkname) < 4:
|
||||
raise EOFError
|
||||
self.chunksize = _read_long(self.file)
|
||||
self.size_read = 0
|
||||
self.offset = self.file.tell()
|
||||
|
||||
def rewind(self):
|
||||
self.file.seek(self.offset, 0)
|
||||
self.size_read = 0
|
||||
|
||||
def setpos(self, pos):
|
||||
if pos < 0 or pos > self.chunksize:
|
||||
raise RuntimeError
|
||||
self.file.seek(self.offset + pos, 0)
|
||||
self.size_read = pos
|
||||
|
||||
def read(self, length):
|
||||
if self.size_read >= self.chunksize:
|
||||
return ''
|
||||
if length > self.chunksize - self.size_read:
|
||||
length = self.chunksize - self.size_read
|
||||
data = self.file.read(length)
|
||||
self.size_read = self.size_read + len(data)
|
||||
return data
|
||||
|
||||
def skip(self):
|
||||
try:
|
||||
self.file.seek(self.chunksize - self.size_read, 1)
|
||||
except RuntimeError:
|
||||
while self.size_read < self.chunksize:
|
||||
dummy = self.read(8192)
|
||||
if not dummy:
|
||||
raise EOFError
|
||||
|
||||
class Wave_read:
|
||||
# Variables used in this class:
|
||||
#
|
||||
# These variables are available to the user though appropriate
|
||||
# methods of this class:
|
||||
# _file -- the open file with methods read(), close(), and seek()
|
||||
# set through the __init__() method
|
||||
# _nchannels -- the number of audio channels
|
||||
# available through the getnchannels() method
|
||||
# _nframes -- the number of audio frames
|
||||
# available through the getnframes() method
|
||||
# _sampwidth -- the number of bytes per audio sample
|
||||
# available through the getsampwidth() method
|
||||
# _framerate -- the sampling frequency
|
||||
# available through the getframerate() method
|
||||
# _comptype -- the AIFF-C compression type ('NONE' if AIFF)
|
||||
# available through the getcomptype() method
|
||||
# _compname -- the human-readable AIFF-C compression type
|
||||
# available through the getcomptype() method
|
||||
# _soundpos -- the position in the audio stream
|
||||
# available through the tell() method, set through the
|
||||
# setpos() method
|
||||
#
|
||||
# These variables are used internally only:
|
||||
# _fmt_chunk_read -- 1 iff the FMT chunk has been read
|
||||
# _data_seek_needed -- 1 iff positioned correctly in audio
|
||||
# file for readframes()
|
||||
# _data_chunk -- instantiation of a chunk class for the DATA chunk
|
||||
# _framesize -- size of one frame in the file
|
||||
|
||||
access _file, _nchannels, _nframes, _sampwidth, _framerate, \
|
||||
_comptype, _compname, _soundpos, \
|
||||
_fmt_chunk_read, _data_seek_needed, \
|
||||
_data_chunk, _framesize: private
|
||||
|
||||
def initfp(self, file):
|
||||
self._file = file
|
||||
self._convert = None
|
||||
self._soundpos = 0
|
||||
form = self._file.read(4)
|
||||
if form != 'RIFF':
|
||||
raise Error, 'file does not start with RIFF id'
|
||||
formlength = _read_long(self._file)
|
||||
if formlength <= 0:
|
||||
raise Error, 'invalid FORM chunk data size'
|
||||
formdata = self._file.read(4)
|
||||
formlength = formlength - 4
|
||||
if formdata != 'WAVE':
|
||||
raise Error, 'not a WAVE file'
|
||||
self._fmt_chunk_read = 0
|
||||
while formlength > 0:
|
||||
self._data_seek_needed = 1
|
||||
chunk = Chunk(self._file)
|
||||
if chunk.chunkname == 'fmt ':
|
||||
self._read_fmt_chunk(chunk)
|
||||
self._fmt_chunk_read = 1
|
||||
elif chunk.chunkname == 'data':
|
||||
if not self._fmt_chunk_read:
|
||||
raise Error, 'data chunk before fmt chunk'
|
||||
self._data_chunk = chunk
|
||||
self._nframes = chunk.chunksize / self._framesize
|
||||
self._data_seek_needed = 0
|
||||
formlength = formlength - 8 - chunk.chunksize
|
||||
if formlength > 0:
|
||||
chunk.skip()
|
||||
if not self._fmt_chunk_read or not self._data_chunk:
|
||||
raise Error, 'fmt chunk and/or data chunk missing'
|
||||
|
||||
def __init__(self, f):
|
||||
if type(f) == type(''):
|
||||
f = __builtin__.open(f, 'r')
|
||||
# else, assume it is an open file object already
|
||||
self.initfp(f)
|
||||
|
||||
def __del__(self):
|
||||
if self._file:
|
||||
self.close()
|
||||
|
||||
#
|
||||
# User visible methods.
|
||||
#
|
||||
def getfp(self):
|
||||
return self._file
|
||||
|
||||
def rewind(self):
|
||||
self._data_seek_needed = 1
|
||||
self._soundpos = 0
|
||||
|
||||
def close(self):
|
||||
self._file = None
|
||||
|
||||
def tell(self):
|
||||
return self._soundpos
|
||||
|
||||
def getnchannels(self):
|
||||
return self._nchannels
|
||||
|
||||
def getnframes(self):
|
||||
return self._nframes
|
||||
|
||||
def getsampwidth(self):
|
||||
return self._sampwidth
|
||||
|
||||
def getframerate(self):
|
||||
return self._framerate
|
||||
|
||||
def getcomptype(self):
|
||||
return self._comptype
|
||||
|
||||
def getcompname(self):
|
||||
return self._compname
|
||||
|
||||
def getparams(self):
|
||||
return self.getnchannels(), self.getsampwidth(), \
|
||||
self.getframerate(), self.getnframes(), \
|
||||
self.getcomptype(), self.getcompname()
|
||||
|
||||
def getmarkers(self):
|
||||
return None
|
||||
|
||||
def getmark(self, id):
|
||||
raise Error, 'no marks'
|
||||
|
||||
def setpos(self, pos):
|
||||
if pos < 0 or pos > self._nframes:
|
||||
raise Error, 'position not in range'
|
||||
self._soundpos = pos
|
||||
self._data_seek_needed = 1
|
||||
|
||||
def readframes(self, nframes):
|
||||
if self._data_seek_needed:
|
||||
self._data_chunk.rewind()
|
||||
pos = self._soundpos * self._framesize
|
||||
if pos:
|
||||
self._data_chunk.setpos(pos)
|
||||
self._data_seek_needed = 0
|
||||
if nframes == 0:
|
||||
return ''
|
||||
if self._sampwidth > 1:
|
||||
# unfortunately the fromfile() method does not take
|
||||
# something that only looks like a file object, so
|
||||
# we have to reach into the innards of the chunk object
|
||||
import array
|
||||
data = array.array(_array_fmts[self._sampwidth])
|
||||
nitems = nframes * self._nchannels
|
||||
if nitems * self._sampwidth > self._data_chunk.chunksize - self._data_chunk.size_read:
|
||||
nitems = (self._data_chunk.chunksize - self._data_chunk.size_read) / self._sampwidth
|
||||
data.fromfile(self._data_chunk.file, nitems)
|
||||
self._data_chunk.size_read = self._data_chunk.size_read + nitems * self._sampwidth
|
||||
data.byteswap()
|
||||
data = data.tostring()
|
||||
else:
|
||||
data = self._data_chunk.read(nframes * self._framesize)
|
||||
if self._convert and data:
|
||||
data = self._convert(data)
|
||||
self._soundpos = self._soundpos + len(data) / (self._nchannels * self._sampwidth)
|
||||
return data
|
||||
|
||||
#
|
||||
# Internal methods.
|
||||
#
|
||||
access *: private
|
||||
|
||||
def _read_fmt_chunk(self, chunk):
|
||||
wFormatTag = _read_short(chunk)
|
||||
self._nchannels = _read_short(chunk)
|
||||
self._framerate = _read_long(chunk)
|
||||
dwAvgBytesPerSec = _read_long(chunk)
|
||||
wBlockAlign = _read_short(chunk)
|
||||
if wFormatTag == WAVE_FORMAT_PCM:
|
||||
self._sampwidth = (_read_short(chunk) + 7) / 8
|
||||
else:
|
||||
raise Error, 'unknown format'
|
||||
self._framesize = self._nchannels * self._sampwidth
|
||||
self._comptype = 'NONE'
|
||||
self._compname = 'not compressed'
|
||||
|
||||
class Wave_write:
|
||||
# Variables used in this class:
|
||||
#
|
||||
# These variables are user settable through appropriate methods
|
||||
# of this class:
|
||||
# _file -- the open file with methods write(), close(), tell(), seek()
|
||||
# set through the __init__() method
|
||||
# _comptype -- the AIFF-C compression type ('NONE' in AIFF)
|
||||
# set through the setcomptype() or setparams() method
|
||||
# _compname -- the human-readable AIFF-C compression type
|
||||
# set through the setcomptype() or setparams() method
|
||||
# _nchannels -- the number of audio channels
|
||||
# set through the setnchannels() or setparams() method
|
||||
# _sampwidth -- the number of bytes per audio sample
|
||||
# set through the setsampwidth() or setparams() method
|
||||
# _framerate -- the sampling frequency
|
||||
# set through the setframerate() or setparams() method
|
||||
# _nframes -- the number of audio frames written to the header
|
||||
# set through the setnframes() or setparams() method
|
||||
#
|
||||
# These variables are used internally only:
|
||||
# _datalength -- the size of the audio samples written to the header
|
||||
# _nframeswritten -- the number of frames actually written
|
||||
# _datawritten -- the size of the audio samples actually written
|
||||
|
||||
access _file, _comptype, _compname, _nchannels, _sampwidth, \
|
||||
_framerate, _nframes, _nframeswritten, \
|
||||
_datalength, _datawritten: private
|
||||
|
||||
def __init__(self, f):
|
||||
if type(f) == type(''):
|
||||
f = __builtin__.open(f, 'w')
|
||||
self.initfp(f)
|
||||
|
||||
def initfp(self, file):
|
||||
self._file = file
|
||||
self._convert = None
|
||||
self._nchannels = 0
|
||||
self._sampwidth = 0
|
||||
self._framerate = 0
|
||||
self._nframes = 0
|
||||
self._nframeswritten = 0
|
||||
self._datawritten = 0
|
||||
self._datalength = 0
|
||||
|
||||
def __del__(self):
|
||||
if self._file:
|
||||
self.close()
|
||||
|
||||
#
|
||||
# User visible methods.
|
||||
#
|
||||
def setnchannels(self, nchannels):
|
||||
if self._datawritten:
|
||||
raise Error, 'cannot change parameters after starting to write'
|
||||
if nchannels < 1:
|
||||
raise Error, 'bad # of channels'
|
||||
self._nchannels = nchannels
|
||||
|
||||
def getnchannels(self):
|
||||
if not self._nchannels:
|
||||
raise Error, 'number of channels not set'
|
||||
return self._nchannels
|
||||
|
||||
def setsampwidth(self, sampwidth):
|
||||
if self._datawritten:
|
||||
raise Error, 'cannot change parameters after starting to write'
|
||||
if sampwidth < 1 or sampwidth > 4:
|
||||
raise Error, 'bad sample width'
|
||||
self._sampwidth = sampwidth
|
||||
|
||||
def getsampwidth(self):
|
||||
if not self._sampwidth:
|
||||
raise Error, 'sample width not set'
|
||||
return self._sampwidth
|
||||
|
||||
def setframerate(self, framerate):
|
||||
if self._datawritten:
|
||||
raise Error, 'cannot change parameters after starting to write'
|
||||
if framerate <= 0:
|
||||
raise Error, 'bad frame rate'
|
||||
self._framerate = framerate
|
||||
|
||||
def getframerate(self):
|
||||
if not self._framerate:
|
||||
raise Error, 'frame rate not set'
|
||||
return self._framerate
|
||||
|
||||
def setnframes(self, nframes):
|
||||
if self._datawritten:
|
||||
raise Error, 'cannot change parameters after starting to write'
|
||||
self._nframes = nframes
|
||||
|
||||
def getnframes(self):
|
||||
return self._nframeswritten
|
||||
|
||||
def setcomptype(self, comptype, compname):
|
||||
if self._datawritten:
|
||||
raise Error, 'cannot change parameters after starting to write'
|
||||
if comptype not in ('NONE',):
|
||||
raise Error, 'unsupported compression type'
|
||||
self._comptype = comptype
|
||||
self._compname = compname
|
||||
|
||||
def getcomptype(self):
|
||||
return self._comptype
|
||||
|
||||
def getcompname(self):
|
||||
return self._compname
|
||||
|
||||
def setparams(self, (nchannels, sampwidth, framerate, nframes, comptype, compname)):
|
||||
if self._datawritten:
|
||||
raise Error, 'cannot change parameters after starting to write'
|
||||
self.setnchannels(nchannels)
|
||||
self.setsampwidth(sampwidth)
|
||||
self.setframerate(framerate)
|
||||
self.setnframes(nframes)
|
||||
self.setcomptype(comptype, compname)
|
||||
|
||||
def getparams(self):
|
||||
if not self._nchannels or not self._sampwidth or not self._framerate:
|
||||
raise Error, 'not all parameters set'
|
||||
return self._nchannels, self._sampwidth, self._framerate, \
|
||||
self._nframes, self._comptype, self._compname
|
||||
|
||||
def setmark(self, id, pos, name):
|
||||
raise Error, 'setmark() not supported'
|
||||
|
||||
def getmark(self, id):
|
||||
raise Error, 'no marks'
|
||||
|
||||
def getmarkers(self):
|
||||
return None
|
||||
|
||||
def tell(self):
|
||||
return self._nframeswritten
|
||||
|
||||
def writeframesraw(self, data):
|
||||
self._ensure_header_written(len(data))
|
||||
nframes = len(data) / (self._sampwidth * self._nchannels)
|
||||
if self._convert:
|
||||
data = self._convert(data)
|
||||
if self._sampwidth > 1:
|
||||
import array
|
||||
data = array.array(_array_fmts[self._sampwidth], data)
|
||||
data.byteswap()
|
||||
data.tofile(self._file)
|
||||
self._datawritten = self._datawritten + len(data) * self._sampwidth
|
||||
else:
|
||||
self._file.write(data)
|
||||
self._datawritten = self._datawritten + len(data)
|
||||
self._nframeswritten = self._nframeswritten + nframes
|
||||
|
||||
def writeframes(self, data):
|
||||
self.writeframesraw(data)
|
||||
if self._datalength != self._datawritten:
|
||||
self._patchheader()
|
||||
|
||||
def close(self):
|
||||
self._ensure_header_written(0)
|
||||
if self._datalength != self._datawritten:
|
||||
self._patchheader()
|
||||
self._file.flush()
|
||||
self._file = None
|
||||
|
||||
#
|
||||
# Internal methods.
|
||||
#
|
||||
access *: private
|
||||
|
||||
def _ensure_header_written(self, datasize):
|
||||
if not self._datawritten:
|
||||
if not self._nchannels:
|
||||
raise Error, '# channels not specified'
|
||||
if not self._sampwidth:
|
||||
raise Error, 'sample width not specified'
|
||||
if not self._framerate:
|
||||
raise Error, 'sampling rate not specified'
|
||||
self._write_header(datasize)
|
||||
|
||||
def _write_header(self, initlength):
|
||||
self._file.write('RIFF')
|
||||
if not self._nframes:
|
||||
self._nframes = initlength / (self._nchannels * self._sampwidth)
|
||||
self._datalength = self._nframes * self._nchannels * self._sampwidth
|
||||
self._form_length_pos = self._file.tell()
|
||||
_write_long(self._file, 36 + self._datalength)
|
||||
self._file.write('WAVE')
|
||||
self._file.write('fmt ')
|
||||
_write_long(self._file, 16)
|
||||
_write_short(self._file, WAVE_FORMAT_PCM)
|
||||
_write_short(self._file, self._nchannels)
|
||||
_write_long(self._file, self._framerate)
|
||||
_write_long(self._file, self._nchannels * self._framerate * self._sampwidth)
|
||||
_write_short(self._file, self._nchannels * self._sampwidth)
|
||||
_write_short(self._file, self._sampwidth * 8)
|
||||
self._file.write('data')
|
||||
self._data_length_pos = self._file.tell()
|
||||
_write_long(self._file, self._datalength)
|
||||
|
||||
def _patchheader(self):
|
||||
if self._datawritten == self._datalength:
|
||||
return
|
||||
curpos = self._file.tell()
|
||||
self._file.seek(self._form_length_pos, 0)
|
||||
_write_long(36 + self._datawritten)
|
||||
self._file.seek(self._data_length_pos, 0)
|
||||
_write_long(self._file, self._datawritten)
|
||||
self._file.seek(curpos, 0)
|
||||
self._datalength = self._datawritten
|
||||
|
||||
def open(f, mode):
|
||||
if mode == 'r':
|
||||
return Wave_read(f)
|
||||
elif mode == 'w':
|
||||
return Wave_write(f)
|
||||
else:
|
||||
raise Error, "mode must be 'r' or 'w'"
|
||||
|
||||
openfp = open # B/W compatibility
|
||||
Loading…
Reference in New Issue