Use Proteaaudio for audio playback

[nomeata]

What works

• Playing OGG files
• Aborting playing when a new sound is played

What needs to be done

• Thread the file format through, or recognize magic bytes
• Handle Play commands in sequence, but abort and restart upon new script
• Wait for MP3 support (or just don’t support it)
• Build on Windows
  • Need help with Conflicting plan-sha256 reported input-output-hk/haskell.nix#2001
• Fix static build:
  • kmod problem (pkgsCross.musl64.kmod fails, but works upstream input-output-hk/haskell.nix#2002)
  • libpulseaudio does not produce static libraries, it seems
    And this seems to be an upstream issue (https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/issues/1089#note_751107)
    Might kill this plan, it seems.
• Test on Windows
• Test on OSX

Fixes #286

[csabahruska]

Would ALSA or OSS work better?
It's possible to enable these backends:
https://github.com/csabahruska/proteaaudio/blob/master/cbits/RtAudio.h#L286-L293

[nomeata]

Good point! I'll investigate.

[nomeata]

Based on https://www.music.mcgill.ca/~gary/rtaudio/compiling.html it seems that in particular the OSS backend needs no extra libraries, so static building should be possible.

For ALSA it seems that [static builds are possible](https://github.com/alsa-project/alsa-lib/blob/master/INSTALL#L4>, so that should work as well; might require more work on the nixpkgs side.

So some Cabal flags to choose a backend might help indeed!

[nomeata]

Would ALSA or OSS work better?

How do I enable that backend, @csabahruska? Just

~/build/haskell/proteaaudio/proteaaudio $ git diff
diff --git a/proteaaudio/proteaaudio.cabal b/proteaaudio/proteaaudio.cabal
index 939c4e0..d0caa1e 100644
--- a/proteaaudio/proteaaudio.cabal
+++ b/proteaaudio/proteaaudio.cabal
@@ -87,9 +87,8 @@ Library
     CXX-Options:        "-D__WINDOWS_DS__"
     Extra-Libraries:    ole32 dsound winmm
   if os(linux)
-    CXX-Options:        "-D__LINUX_PULSE__"
-    Extra-Libraries:    pthread pulse-simple pulse
-    pkgconfig-depends:  libpulse-simple, libpulse
+    CXX-Options:        "-D__LINUX_OSS__"
+    Extra-Libraries:    pthread
   if os(darwin)
     CXX-Options:        "-D__MACOSX_CORE__"
     Extra-Libraries:    pthread

Did not seem to be enough, I get errors from the C compiler.

[csabahruska]

It should be that but it seems that OSS is simply broken on recent linux systems. others have the same issue: mltframework/mlt#716 (comment)
Does any program that uses the OSS API compile on you machine?

[nomeata]

Yeah, also see thestk/rtaudio#90. Probably OSS not is not a way to go. That leaves ALSA 👀

[nomeata]

I can compile against alsa with this:

diff --git a/proteaaudio/proteaaudio.cabal b/proteaaudio/proteaaudio.cabal
index cb2cba8..89ab45f 100644
--- a/proteaaudio/proteaaudio.cabal
+++ b/proteaaudio/proteaaudio.cabal
@@ -88,9 +88,9 @@ Library
     CXX-Options:        "-D__WINDOWS_DS__"
     Extra-Libraries:    ole32 dsound winmm
   if os(linux)
-    CXX-Options:        "-D__LINUX_PULSE__"
-    Extra-Libraries:    pthread pulse-simple pulse
-    pkgconfig-depends:  libpulse-simple, libpulse
+    CXX-Options:        "-D__LINUX_ALSA__"
+    Extra-Libraries:    pthread
+    pkgconfig-depends:  alsa
   if os(darwin)
     CXX-Options:        "-D__MACOSX_CORE__"
     Extra-Libraries:    pthread

and it works if I compile normally.

I can even compile statically against a statically linked ALSA library, but the resulting binary doesn’t work:

~/projekte/tiptoi/tip-toi-reveng $ ./result/bin/tttool play text2speech.gme
Initial state (not showing zero registers): $0=0
Playing audio sample 0
ALSA lib control.c:1543:(snd_ctl_open_conf) Either /nix/store/rp36fxs6am3pxbfwnf3hnl947yx6dxyl-alsa-plugins-1.2.7.1/lib/alsa-lib/libasound_module_ctl_pulse.so cannot be opened or _snd_ctl_pulse_open was not defined inside
ALSA lib control.c:1543:(snd_ctl_open_conf) Either /nix/store/rp36fxs6am3pxbfwnf3hnl947yx6dxyl-alsa-plugins-1.2.7.1/lib/alsa-lib/libasound_module_ctl_pulse.so cannot be opened or _snd_ctl_pulse_open was not defined inside
ALSA lib control.c:1543:(snd_ctl_open_conf) Either /nix/store/rp36fxs6am3pxbfwnf3hnl947yx6dxyl-alsa-plugins-1.2.7.1/lib/alsa-lib/libasound_module_ctl_pulse.so cannot be opened or _snd_ctl_pulse_open was not defined inside
ALSA lib control.c:1543:(snd_ctl_open_conf) Either /nix/store/rp36fxs6am3pxbfwnf3hnl947yx6dxyl-alsa-plugins-1.2.7.1/lib/alsa-lib/libasound_module_ctl_pulse.so cannot be opened or _snd_ctl_pulse_open was not defined inside
ALSA lib control.c:1543:(snd_ctl_open_conf) Either /nix/store/rp36fxs6am3pxbfwnf3hnl947yx6dxyl-alsa-plugins-1.2.7.1/lib/alsa-lib/libasound_module_ctl_pulse.so cannot be opened or _snd_ctl_pulse_open was not defined inside
ALSA lib control.c:1543:(snd_ctl_open_conf) Either /nix/store/rp36fxs6am3pxbfwnf3hnl947yx6dxyl-alsa-plugins-1.2.7.1/lib/alsa-lib/libasound_module_ctl_pulse.so cannot be opened or _snd_ctl_pulse_open was not defined inside
ALSA lib control.c:1543:(snd_ctl_open_conf) Either /nix/store/rp36fxs6am3pxbfwnf3hnl947yx6dxyl-alsa-plugins-1.2.7.1/lib/alsa-lib/libasound_module_ctl_pulse.so cannot be opened or _snd_ctl_pulse_open was not defined inside
ALSA lib control.c:1543:(snd_ctl_open_conf) Either /nix/store/rp36fxs6am3pxbfwnf3hnl947yx6dxyl-alsa-plugins-1.2.7.1/lib/alsa-lib/libasound_module_ctl_pulse.so cannot be opened or _snd_ctl_pulse_open was not defined inside
ALSA lib control.c:1543:(snd_ctl_open_conf) Either /nix/store/rp36fxs6am3pxbfwnf3hnl947yx6dxyl-alsa-plugins-1.2.7.1/lib/alsa-lib/libasound_module_ctl_pulse.so cannot be opened or _snd_ctl_pulse_open was not defined inside
ALSA lib control.c:1543:(snd_ctl_open_conf) Either /nix/store/rp36fxs6am3pxbfwnf3hnl947yx6dxyl-alsa-plugins-1.2.7.1/lib/alsa-lib/libasound_module_ctl_pulse.so cannot be opened or _snd_ctl_pulse_open was not defined inside
ALSA lib control.c:1543:(snd_ctl_open_conf) Either /nix/store/rp36fxs6am3pxbfwnf3hnl947yx6dxyl-alsa-plugins-1.2.7.1/lib/alsa-lib/libasound_module_ctl_pulse.so cannot be opened or _snd_ctl_pulse_open was not defined inside
ALSA lib control.c:1543:(snd_ctl_open_conf) Either /nix/store/rp36fxs6am3pxbfwnf3hnl947yx6dxyl-alsa-plugins-1.2.7.1/lib/alsa-lib/libasound_module_ctl_pulse.so cannot be opened or _snd_ctl_pulse_open was not defined inside
ALSA lib control.c:1543:(snd_ctl_open_conf) Either /nix/store/rp36fxs6am3pxbfwnf3hnl947yx6dxyl-alsa-plugins-1.2.7.1/lib/alsa-lib/libasound_module_ctl_pulse.so cannot be opened or _snd_ctl_pulse_open was not defined inside
ALSA lib control.c:1543:(snd_ctl_open_conf) Either /nix/store/rp36fxs6am3pxbfwnf3hnl947yx6dxyl-alsa-plugins-1.2.7.1/lib/alsa-lib/libasound_module_ctl_pulse.so cannot be opened or _snd_ctl_pulse_open was not defined inside
ALSA lib pcm.c:2657:(snd_pcm_open_conf) Either /nix/store/rp36fxs6am3pxbfwnf3hnl947yx6dxyl-alsa-plugins-1.2.7.1/lib/alsa-lib/libasound_module_pcm_pulse.so cannot be opened or _snd_pcm_pulse_open was not defined inside
RtApiAlsa::probeDeviceOpen: pcm device (default) won't open for output.

It seems that ALSA has a plugin architecture, and once compiled statically, it cannot load such plugins any more? In that way, it’s no better for me than using libpulse.

[csabahruska]

So what will you do? Is it possible at all on linux to use static linking with on audio lib.

[nomeata]

I'm inclined to use the old code, shelling out to sox, on Linux, but use your library on Windows and OsX (when and if MP3 is supported)