add a class to convert from absolute MIDI tick to milliseconds

[shimpe]

it seems to work for me, maybe it's also interesting for you

I've implemented it as a wrapper class to avoid messing up the existing code base and to avoid making the system slower if this functionality is not needed.

[danog]

Looks awesome, was looking for this.
Thanks!

[billybob71a]

I am have trouble implementing your wrapper class. It gives me an error saying no such attribute "TimeResolver" using example_3.py.

I have installed it using sudo python setup.py install.

[shimpe]

@billybob71a to the best of my knowledge the TimeResolver class was never added into the official code. You'd need to get the code from github directly by cloning my fork https://github.com/shimpe/python-midi

[billybob71a]

Hi,
Actually, the TimeResolver class was never included in the sequencer.py installed in "python2.7/dist-packages/midi/sequencer/". I had to concatenate it into the sequencer.py from your git repository. Afterwards, I discovered some traceback messages. First it was :
last = SetTempoEvent()
so
I changed it to:
last = midi.SetTempoEvent()

Now, it is:
AttributeError: 'SetTempoEvent' object has not attribute 'msdelay'

I was just using your sample script example_3.py
for event in track:
name = event.name
tick = event.tick
milliseconds = time_resolver.tick2ms(tick)
print ("event {0} with MIDI tick {1} happens after {2} milliseconds.".format(name, tick, milliseconds))

But it cannot even retrieve the milliseconds.

Peter

[shimpe]

@billybob71a better check the changes in shimpe@9aa092e to see that you need to change some other things beside just appending the class. You could try to replace your version of sequencer.py with the one from my fork.

[billybob71a]

Sorry, maybe I am a little bit new to using GIT. I did a git clone https://github.com/shimpe/python-midi.git. How, do I only get the changes in shimpe/python-midi@9aa092e ?

[shimpe]

@billybob71a If you cloned my fork, you should be able to install it as described in the readme file (sudo python setup.py install). My code is identical to the code here except for my changes related to TimeResolver. To be certain that we don't mix different versions of python-midi, you could remove the "pip install"-ed one first.

[billybob71a]

Yes, I git cloned it from your fork. As follows:
git clone https://github.com/shimpe/python-midi.git

I ran :
sudo python setup.py install
It installed:
running install
running build_ext
running build
running build_py
creating build/lib.linux-x86_64-2.7/src
copying src/init.py -> build/lib.linux-x86_64-2.7/src
copying src/sequencer.py -> build/lib.linux-x86_64-2.7/src
running build_scripts
running install_lib
creating /usr/local/lib/python2.7/dist-packages/midi
copying build/lib.linux-x86_64-2.7/midi/constants.py -> /usr/local/lib/python2.7/dist-packages/midi
copying build/lib.linux-x86_64-2.7/midi/containers.py -> /usr/local/lib/python2.7/dist-packages/midi
copying build/lib.linux-x86_64-2.7/midi/events.py -> /usr/local/lib/python2.7/dist-packages/midi
copying build/lib.linux-x86_64-2.7/midi/util.py -> /usr/local/lib/python2.7/dist-packages/midi
creating /usr/local/lib/python2.7/dist-packages/midi/sequencer
copying build/lib.linux-x86_64-2.7/midi/sequencer/sequencer.py -> /usr/local/lib/python2.7/dist-packages/midi/sequencer
copying build/lib.linux-x86_64-2.7/midi/sequencer/sequencer_alsa.py -> /usr/local/lib/python2.7/dist-packages/midi/sequencer
copying build/lib.linux-x86_64-2.7/midi/sequencer/_sequencer_alsa.so -> /usr/local/lib/python2.7/dist-packages/midi/sequencer
copying build/lib.linux-x86_64-2.7/midi/sequencer/init.py -> /usr/local/lib/python2.7/dist-packages/midi/sequencer
copying build/lib.linux-x86_64-2.7/midi/fileio.py -> /usr/local/lib/python2.7/dist-packages/midi
copying build/lib.linux-x86_64-2.7/midi/init.py -> /usr/local/lib/python2.7/dist-packages/midi
creating /usr/local/lib/python2.7/dist-packages/src
copying build/lib.linux-x86_64-2.7/src/sequencer.py -> /usr/local/lib/python2.7/dist-packages/src
copying build/lib.linux-x86_64-2.7/src/init.py -> /usr/local/lib/python2.7/dist-packages/src
byte-compiling /usr/local/lib/python2.7/dist-packages/midi/constants.py to constants.pyc
byte-compiling /usr/local/lib/python2.7/dist-packages/midi/containers.py to containers.pyc
byte-compiling /usr/local/lib/python2.7/dist-packages/midi/events.py to events.pyc
byte-compiling /usr/local/lib/python2.7/dist-packages/midi/util.py to util.pyc
byte-compiling /usr/local/lib/python2.7/dist-packages/midi/sequencer/sequencer.py to sequencer.pyc
byte-compiling /usr/local/lib/python2.7/dist-packages/midi/sequencer/sequencer_alsa.py to sequencer_alsa.pyc
byte-compiling /usr/local/lib/python2.7/dist-packages/midi/sequencer/init.py to init.pyc
byte-compiling /usr/local/lib/python2.7/dist-packages/midi/fileio.py to fileio.pyc
byte-compiling /usr/local/lib/python2.7/dist-packages/midi/init.py to init.pyc
byte-compiling /usr/local/lib/python2.7/dist-packages/src/sequencer.py to sequencer.pyc
byte-compiling /usr/local/lib/python2.7/dist-packages/src/init.py to init.pyc
running install_egg_info
running egg_info
writing midi.egg-info/PKG-INFO
writing top-level names to midi.egg-info/top_level.txt
writing dependency_links to midi.egg-info/dependency_links.txt
reading manifest file 'midi.egg-info/SOURCES.txt'
writing manifest file 'midi.egg-info/SOURCES.txt'
Copying midi.egg-info to /usr/local/lib/python2.7/dist-packages/midi-v0.2.3.egg-info
running install_scripts
changing mode of /usr/local/bin/mididumphw.py to 755
changing mode of /usr/local/bin/midiplay.py to 755
changing mode of /usr/local/bin/mididump.py to 755

And I ran it in ipython, however, you can see that there is no "TimeResolver" option in "sequencer" module.

In [1]: import midi

In [2]: import midi.sequencer as sequencer

In [3]: sequencer.
sequencer.S sequencer.SequencerDuplex sequencer.SequencerRead sequencer.midi sequencer.sequencer sequencer.stringify
sequencer.Sequencer sequencer.SequencerHardware sequencer.SequencerWrite sequencer.select sequencer.sequencer_alsa

In [3]: sequencer.

[shimpe]

The TimeResolver class is part of the sequencer.py file. If you open the sequencer.py file in a text editor, you should be able to locate it. Is it possible the autocompletion in ipython is still using some (outdated) cached information?

[billybob71a]

There is no outdated cache information. I checked the .local directory and I removed the packages in /usr/local/lib/python2.7/dist-packages/mid and I re-installed it. This is the first time that I have installed it. Have you tried to install it on a new computer recently? Is it working for you?

[shoegazerstella]

Thanks a lot for this feature! However I get this error:

milliseconds = time_resolver.tick2ms(tick)
File "build/bdist.macosx-10.13-intel/egg/midi/sequencer.py", line 83, in tick2ms
AttributeError: 'SetTempoEvent' object has no attribute 'msdelay'

Could you help?

[shimpe]

Pfff what a mess. It seems something is very wrong indeed. Let me see if there's a way to make some progress.

[shimpe]

Ok here's something to try (python 3 only - hope that's not too inconvenient).
This is based on a more recent version of python-midi for python3 found here: https://github.com/mgedmin/python-midi
(a pull request from them exists for this project as well, but I'm not sure if this one is still very active)

cd ~
mkdir workingfolder
cd workingfolder
git clone https://github.com/shimpe/python-midi.git
cd python-midi
git checkout py3_timeresolver
sudo python setup.py install
python examples/example_3.py

(on my system python activates python3, on your system, you may need to explicitly call python3 instead)