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Discussed in #12

Error message:

psgplay % make V=1 all
lib/internal/Makefile:19: WARNING: Disassembler disabled: The C compiler does not support __attribute__((__scalar_storage_order__("big-endian")))
cc -shared -Wl,-soname,libpsgplay.so.0 -g -o lib/psgplay/libpsgplay.so lib/psgplay/ice.o lib/psgplay/version.o lib/psgplay/psgplay.o lib/psgplay/sndh.o lib/psgplay/bit.o lib/psgplay/fifo.o lib/psgplay/print.o lib/psgplay/string.o lib/psgplay/bus.o lib/psgplay/cpu.o lib/psgplay/device.o lib/psgplay/exception-vector.o lib/psgplay/fdc.o lib/psgplay/glue.o lib/psgplay/machine.o lib/psgplay/mfp.o lib/psgplay/mixer.o lib/psgplay/mmu.o lib/psgplay/mmu-trace.o lib/psgplay/psg.o lib/psgplay/ram.o lib/psgplay/rom.o lib/psgplay/shifter.o lib/psgplay/sound.o lib/psgplay/system-variable.o lib/psgplay/m68kops.o lib/psgplay/m68kcpu.o
ld: unknown options: -soname 
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [lib/psgplay/libpsgplay.so] Error 1

It was just discovered that http://sndh.atari.org/sndh/sndh_lf/Mad_Max/Demos/So_Watt/S_O_S.sndh 's (https://demozoo.org/music/114761/) bass sounds wrong - maybe some envelope setting? Checked with native Linux wav renderer and also in the emscripten build. This is prbly a fix that might help alot of other songs, too.

Make a PSG play plugin for the Music Player Daemon (MPD).

Implement a driver for Core Audio in lib/out/core-audio.c. PSG play for Mac OS is currently limited to saving WAVE format files. Linux, on the other hand, also has a driver for ALSA in lib/out/alsa.c, which permits an interactive text mode user interface:

Starts playing nice, then after 23 seconds it exits violently with:

psgplay: error: (null): ALSA snd_pcm_writei failed: -32 Broken pipe

Also leaving the terminal in a bad state.

PS: Wondering how I can make it play without alsa. Maybe adding a feature that an output file of "-" means to dump the wav to stdout, then I can pipe it into any player. Asking psgplay to write to a named pipe does unfortunately not work "Illegal seek".

Have PSG play disassemble files in m68k Motorola syntax rather than MIT syntax.

Some SNDH files made for the Atari STE make use of the LMC1992 circuit for tone and volume control. Let PSG play emulate this piece of hardware:

The LMC1992 is a monolithic integrated circuit that providesfour stereo inputs, bass and treble tone controls, and volume, balance, and front-rear fader controls. These functions are digitally controlled through a three-wire communication interface.

Plan:

• define mixer device in lib/atari/mixer.c;
• read and write Microwire registers;
• mixer control;
• main volume control;
• left and right volume controls;
• bass control;
• treble control.

As an option, a dual screen is displayed via the serial port of the Atari ST, for remote control using a null modem or similar. See also #6. PSG play for Atari ST currently displays a VT52 video screen:

As an option, use GEM for a graphical user interface for Atari ST. See also #5. Plan:

• AES for TOS/libc;
• VDI for TOS/libc;
• design an application user interface;
• implement GEM user interface.

PSG play for Atari ST currently displays a VT52 video screen:

I hit a little bump building psgplay. Here's the end of the output:

$ make ALSA=1
...
  CC      lib/m68k/m68kdasm.o
  CC      lib/m68k/softfloat.o
  CC      lib/psgplay/psgplay.o
  CC      lib/psgplay/sndh.o
script/version: 4: set: Illegal option -o pipefail
lib/psgplay/Makefile:15: recipe for target 'lib/psgplay/version.c' failed
make: *** [lib/psgplay/version.c] Error 2

I discovered that set -o pipefail is a bashism, and that bash is not the default shell on my machine.

I was able to fix the problem by changing the shebang of script/version from #!/bin/sh to #!/bin/bash

Happy to submit a PR if you like.

Emulate

• XBIOS Unlocksnd (129) (ignore);
• XBIOS Xbtimer (31);
• GEMDOS Malloc (72);
• GEMDOS Mfree (73) (ignore).

For details, see #13 (comment).

TOS/libc in lib/toslibc is a variant of a C standard library that can be used to build other C programs for Atari ST, and so it makes sense to create a new TOS/libc repository for it. Its main feature is that a normal unmodified m68k compiler can be used without applying any patches. Unlike traditional Atari ST compilers, C int type integers are 32-bit rather than 16-bit.

The FreeMiNT libcmini package is similar, but it requires a special m68k-atari-mint compiler.

Building PSG play as a library allows other music players to link with it.

• Update and document the API in include/psgplay/psgplay.h and have it read PSG samples in direct 250 kHz digital three channel form, to permit custom analogue filters and mixers.
• Add libpsgplay.a and libpsgplay.so build targets to Makefile.
• Add install target with PREFIX parameter to Makefile.
• Add lib/psgplay/example-info.c to print SNDH information.
• Add lib/psgplay/example-play.c to produce 16-bit 44.1 kHz stereo on standard output.

Write a doc/psgplay.1 manual page describing how to use the PSG play program for Linux and Mac OS.

Some SNDH files made for the Atari STE make use of its sound DMA hardware. Let PSG play emulate this piece of hardware. Plan:

• define DMA sound device in lib/atari/sound.c;
• 6258, 12517, 25033 and 50066 Hz sampling frequencies;
• mono and stereo sound;
• 8-byte FIFO DMA prefetch buffer;
• Double buffer DMA sound registers;
• assert MFP GPIP I7 DMA interrupt;
• assert MFP Timer A DMA interrupt.

This track is playing too slow:
https://sndh.atari.org/?ID=1441

I am speculating that it's because of the 200Hz?
Checked with command line: same problem.

As an option, have PSG play on Atari ST accept MIDI commands in two forms:

• traditional MIDI instrument control for the three channels of the YM2149;
• raw YM2149 register settings via MIDI, as a technical means of PSG register remote control.

As a variant, the standard MIDI file (SMF) file format could be supported.

In the SNDH archive, file Daglish_Ben/Footballer_of_the_Year_2.sndh plays a couple of seconds then the rest is silent.
In interactive mode it shows that it is still playing track 1 although there is no sound.
Is it possible to get psgplay to move onto the next track when the first one has finished playing? --stop=auto isn't working for this particular file.
Maybe silence detection is required?

Originally mentioned in #13 (comment)

While writing out the 3 single channels I stumbled upon:

This file is just playing a tone. I updated to the latest as I was a bit of of date, but no change:
Tao/TSD_STe/Intensity.sndh