C# .Net extend existing vst host

In Progress Posted Feb 2, 2015 Paid on delivery
In Progress Paid on delivery

C# .Net extend vst host

The AudioVSTToolbox project on Github contains an example implementation for a vst host:

[login to view URL]

The existing application does the following:

- Only loads one VSTi instrument at a time.

- Provides a basic user interface to load an instrument, open it's editor.

- Allows you to send midi notes to the instrument and outputs the audio from the instrument playing the notes.

- Does not allow to chain vst effect plugins with the instrument.

- Only plays real time midi notes, there is nothing to send notes programmatically on a fixed time interval.

Required is a modified version that's closer to what a real vst host would do:

- The project is extended so I as a user can load/unload several instruments.

- As a user I can chain vst effects with an instrument (so the output of processreplacing of the instruments is running through the ordered list of vst effects before finally get output). The vst effects chained to an instrument can be a fixed number and be limited to 3 effects.

- There is a mechanism in place that, on a fixed time interval, allows the program to feed in noteon and noteoff events. For example to connect a piano roll to it.

- As in the existing project there is a main mixer object that gathers the audio output from the single instrument streams into one audio stream.

- I can define a bpm (beats per minute) value and change this value on the fly in steps of 1 bpm.

- I can remove and add instruments or effects while playback is running without the software to crash or leak memory.

Not required:

- The mixer in the existing project allows audio recording of the instrument audio output. That's not required.

- The existing project visualizes the audio output. That's also not required.

- The existing project has some functions in it to load the list of parameters of the currently loaded vst instrument and display them in a custom dialog window. Not needed.

Pre-conditions:

- Language/framework is c# .net.

- It has to be [login to view URL] for loading and hosting vst plugins.

- The audiovsttoolbox project uses naudio for audio output. Either this or portaudiosharp can be used.

The product is accepted as final if:

- There is a very basic user interface that allows to load, unloads vst instruments and displays a list of all loaded instruments.

- The user interface allows to start and stop playback.

- The user interface allows to set the bpm (beats per minute) and change it during playback.

- The user interface allows to load, unload vst effects and assign them to a certain vst instrument.

- The editor for each instrument and effect can be opened.

- In order to test the requirement that notes can be sent on a fixed timer interval:

- For each vst instrument I can access a simple step sequencer with 16 columns(steps). Each column represents a 16th note.

- The step sequencer has three rows, the first row represents the note C, the second the note E and the third the note G.

- I can set an entry (e.g. column 4, row 2) to active or inactive.

- When the program is playing audio, it loops over the step sequencer for each instrument, checks whether there is a note to play and plays the note (in octave 4).

- A note is played when the according entry in the step sequencer is active.

- To keep it simple, the necessary note off event for every note can be sent in the next step, so each note length is a 16th note.

- Notes that are meant to be played at the same time are played at the same time (e.g. if I have three instruments loaded, in the step sequencer for each instrument all notes are set to active in column 1, I want to hear the instruments playing C/E/G aka a C major chord on every first 16th note aka every full note).

Some additions:
- Having worked with this framework and done most of the features myself before, the realistic effort is 2-5 man days. Code is about a few classes and few hundred lines of code that are mostly already in the existing project, and more or less about solving the puzzle how to sync the irregular frequency in which the audio buffer is filled with the fixed timing interval in which midi notes are played by the step sequencer.
- The final product is the c# source code.
- There will be ne upfront payment before any work is delivered. Instead we can set up a milestone where you only deliver a compiled version of the test application that proves that your code is able to do what it's expected to do. Full payment on delivery of the source code.

.NET C# Programming

Project ID: #7072787

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