Comments (3)
The logic will have to consider all three methods: sf_open()
, sf_open_virtual()
(as introduced in #1) and sf_open_fd()
.
from python-soundfile.
Are Python file descriptors convertible to C file descriptors? Otherwise, this would have to be handled with sf_open_virtual
.
I don't quite see the utility of having this. Can you give an example where this might be useful?
from python-soundfile.
Are Python file descriptors convertible to C file descriptors?
It looks like they are. You can get a file descriptor from a Python file object with the method fileno()
.
I'm not quite sure what happens if the file object implements some kind of buffering ... this might break things.
You can also get file descriptors directly, e.g. with os.open()
.
Otherwise, this would have to be handled with
sf_open_virtual
.
As discussed in #1, this can only be used if seek()
is supported. With sf_open_fd()
, however, this should work without seek()
, so the streaming feature discussed in #1 should be possible.
I don't quite see the utility of having this. Can you give an example where this might be useful?
To be honest, I don't actually have a use for this, I just think it's good to implement as many libsndfile features as possible, it might be useful to someone sometime.
But to give an example anyway, if someone wants to read from a pipe, this should be only possible with sf_open_fd()
, at least according to http://stackoverflow.com/questions/8370499/audio-file-format-that-can-be-written-without-seeking (though I didn't actually try it myself).
I implemented this prototypically in #18, commit f0c7735, and it doesn't add a lot of code.
It just needs a new argument closefd
and these two lines (and one line in the cdef
):
elif isinstance(file, int):
self._file = _snd.sf_open_fd(file, self.mode, info, closefd)
BTW, I removed the argument virtual_io
because it's redundant, we can automatically check if a file-like object was provided (and the check was even already implemented).
And also BTW, the virtual_io
feature is broken, because it checks for a read
attribute but then uses the readinto()
method. The latter seems not to be available for all types of file objects, maybe this should be checked and read()
should be used as a fallback?
from python-soundfile.
Related Issues (20)
- numpy is a dependency, but this is not declared HOT 3
- Feature request: Support interleaved stereo data HOT 4
- buffer_read doesn't work in basic test HOT 2
- Soundfile read/write wav is not symmetric with default arguments HOT 3
- module 'soundfile' has no attribute 'SoundFileRuntimeError' HOT 5
- Value Error: array is too big when loading .flac file
- soundfile crashes when trying to export long .ogg file HOT 1
- soundfile.LibsndfileError: Error opening <_io.BytesIO object at 0x0000022B81C21850>: Format not recognised. HOT 2
- Cannot suppress warnings when decoding mp3
- Cannot open Ogg FLAC file: unknown error in flac decoder HOT 1
- miniforge3/lib/python3.9/site-packages/soundfile.py", line 1229, in _init_virtual_io def vio_get_filelen(user_data): MemoryError: Cannot allocate write+execute memory for ffi.callback(). You might be running on a system that prevents this. For more information, see https://cffi.readthedocs.io/en/latest/using.html#callbacks
- Cannot write Ogg files over 96 seconds long at 44.1 kHz HOT 4
- soundfile.info does not work on mp3 HOT 2
- soundfile.LibsndfileError: <exception str() failed> HOT 6
- How to save left and right channel in separate files? HOT 1
- soundfile.LibsndfileError: Error : unknown error in flac decoder. HOT 2
- "Format not recognised." for m4a files HOT 2
- soundfile.LibsndfileError: Error opening <tempfile._TemporaryFileWrapper object at 0x7feadae59070>: Format not recognised. HOT 2
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from python-soundfile.