Eric, I'm hoping to publish my library in the next week here:
darcs get http://code.haskell.org/portaudio/ It implements the Haskell bindings to the PortAudio library. This is the library behind Audacious. I *have not* implemented the callback model yet, but I plan to do that. Perhaps this will be something which is useful to you? On Sun, Aug 24, 2008 at 11:41 AM, Eric Kidd <[EMAIL PROTECTED]> wrote: > Greetings, Haskell folks! > > I'm working on a toy program for drum synthesis. This has lead me to > explore the various sound-related libraries in Hackage. Along the way, > I've learned several things: > > 1. There's a lot of Haskell sound libraries, but no agreement on how > to represent buffers of audio data. > 2. Some of the most useful sound libraries aren't listed in Hackage's > "Sound" section, including HCodecs, SDL-mixer and hogg. > 3. The Haskell OpenAL bindings are great, but ALUT has been removed > from MacOS 10.5. Of course, a pure-Haskell version of ALUT would > be pretty easy to write, and it could be used as a fallback. > 4. '[[a]]' is _not_ a good representation for multi-channel audio > data. Manipulating even 10 seconds of audio is noticeably slow. > 5. HCodecs is probably the best library for reading WAVE files. It > uses 'DiffUArray Int a' to represent audio data, and not '[[a]]'. > It also supports MIDI and SoundFont, which is quite handy. > 6. YampaSynth looks really cool, and it might be possible to turn it > into a reusable MIDI synthesizer library for use with HCodecs. > This would be extremely useful: it would provide a basis for all > kinds of crazy MIDI-based programming in Haskell. > > At the end of this e-mail, you can find a list of Haskell sound > libraries and their supported audio formats. > > What would the ideal Haskell sound API look like? Personally, I would > love to see: > > a. Something like HCodecs's Data.Audio as the basic sound format. > Data.Audio is an array-based API, and it supports converting > between a wide range of common sample formats. I don't know how > fast this is, but it already exists, and it's used by YampaSynth. > b. OpenAL for sound playback, with a portable version of ALUT. This > may require writing a pure-Haskell version of ALUT. > c. Utility functions to convert Data.Audio to OpenAL.AL.Buffer. > d. An easy-to-use API for audio processing. It might be possible to > start with something like Jack's 'mainMono' and 'mainStereo' > functions, which map a function over an audio stream. > > Other nice-to-have features might include: > > e. A standard MIDI format, based on either the HCodecs package or the > midi package. (HCodecs is used by YampaSynth, and the midi package > is used by alsa-midi.) > f. A modular version of YampaSynth which can convert MIDI data > structures into Data.Audio values. > > It looks like Haskell could be a really sweet audio programming > environment with just a bit of integration work. What do folks think? > Are there other libraries I should look at more closely? Other features > that should be included in an ideal audio API? > > Thank you for your advice and feedback! > > Cheers, > Eric > > > Haskell audio libraries > > Reading and writing sound files: > HCodecs: (Audible a) => DiffUArray Int a > hsndfile: MArray with Float and Double > HSoundFile: [[Double]] > ALUT: OpenAL.AL.Buffer > WAVE: [[Int32]] > > Playing sounds: > OpenAL: Ptr UInt8, Ptr Int16, 1-N channels > SDL-mixer: ForeignPtr ChunkStruct, ForeignPtr MusicStruct > > Sound processing libraries: > dsp: Array a, [a] > jack: Operates via mapping functions > mainMono :: (CFloat -> IO CFloat) -> IO () > mainStereo :: ((CFloat, CFloat) -> IO (CFloat, CFloat)) -> IO () > > MIDI-based: > HCodecs: Reads and writes MIDI files > midi: Reads and writes MIDI files > alsa-midi: Uses midi library > YampaSynth: Stand-alone program > > Special-purpose APIs only (FFIs, etc.): > hCsound: CsoundPtr > hsc3: UGen > > No public sound-buffer API: > hbeat: The relevant source files are missing! > hogg: Very low-level API for Ogg internals only > libmpd: No sound buffer API > sonic-visualizer: No sound buffer API > truelevel: Stand-alone program (uses WAVE) > wavconvert: Stand-alone program > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe > -- /jve
_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
