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authorJakob L. Kreuze <jakob@memeware.net>2018-05-31 16:05:00 -0400
committerJakob L. Kreuze <jakob@memeware.net>2018-05-31 16:05:00 -0400
commitdfefe1c3fa92abdec713a40c1424bee05f504fad (patch)
tree67891db1f0123510bf82a258bd849992eecdfe6f
Initial commit.
-rw-r--r--.gitignore4
-rw-r--r--Cargo.toml14
-rw-r--r--LICENSE165
-rw-r--r--README.md29
-rw-r--r--build.rs7
-rw-r--r--examples/player/.gitignore2
-rw-r--r--examples/player/Cargo.toml8
-rw-r--r--examples/player/src/main.rs66
-rw-r--r--src/lib.rs220
9 files changed, 515 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a821aa9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+
+/target
+**/*.rs.bk
+Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..72750e1
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[workspace]
+members = [
+ "examples/player",
+]
+
+[package]
+name = "wildmidi"
+version = "0.1.0"
+authors = ["Jakob L. Kreuze <jakob@memeware.net>"]
+links = "WildMidi"
+build = "build.rs"
+
+[dependencies]
+simple-error = "0.1"
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..0a04128
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,165 @@
+ GNU LESSER GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+ This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+ 0. Additional Definitions.
+
+ As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+ "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+ An "Application" is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
+Defining a subclass of a class defined by the Library is deemed a mode
+of using an interface provided by the Library.
+
+ A "Combined Work" is a work produced by combining or linking an
+Application with the Library. The particular version of the Library
+with which the Combined Work was made is also called the "Linked
+Version".
+
+ The "Minimal Corresponding Source" for a Combined Work means the
+Corresponding Source for the Combined Work, excluding any source code
+for portions of the Combined Work that, considered in isolation, are
+based on the Application, and not on the Linked Version.
+
+ The "Corresponding Application Code" for a Combined Work means the
+object code and/or source code for the Application, including any data
+and utility programs needed for reproducing the Combined Work from the
+Application, but excluding the System Libraries of the Combined Work.
+
+ 1. Exception to Section 3 of the GNU GPL.
+
+ You may convey a covered work under sections 3 and 4 of this License
+without being bound by section 3 of the GNU GPL.
+
+ 2. Conveying Modified Versions.
+
+ If you modify a copy of the Library, and, in your modifications, a
+facility refers to a function or data to be supplied by an Application
+that uses the facility (other than as an argument passed when the
+facility is invoked), then you may convey a copy of the modified
+version:
+
+ a) under this License, provided that you make a good faith effort to
+ ensure that, in the event an Application does not supply the
+ function or data, the facility still operates, and performs
+ whatever part of its purpose remains meaningful, or
+
+ b) under the GNU GPL, with none of the additional permissions of
+ this License applicable to that copy.
+
+ 3. Object Code Incorporating Material from Library Header Files.
+
+ The object code form of an Application may incorporate material from
+a header file that is part of the Library. You may convey such object
+code under terms of your choice, provided that, if the incorporated
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+ a) Give prominent notice with each copy of the object code that the
+ Library is used in it and that the Library and its use are
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+ b) Accompany the object code with a copy of the GNU GPL and this license
+ document.
+
+ 4. Combined Works.
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+ You may convey a Combined Work under terms of your choice that,
+taken together, effectively do not restrict modification of the
+portions of the Library contained in the Combined Work and reverse
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+ a) Give prominent notice with each copy of the Combined Work that
+ the Library is used in it and that the Library and its use are
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+ b) Accompany the Combined Work with a copy of the GNU GPL and this license
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+ c) For a Combined Work that displays copyright notices during
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+ d) Do one of the following:
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+ suitable for, and under terms that permit, the user to
+ recombine or relink the Application with a modified version of
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+ manner specified by section 6 of the GNU GPL for conveying
+ Corresponding Source.
+
+ 1) Use a suitable shared library mechanism for linking with the
+ Library. A suitable mechanism is one that (a) uses at run time
+ a copy of the Library already present on the user's computer
+ system, and (b) will operate properly with a modified version
+ of the Library that is interface-compatible with the Linked
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+ e) Provide Installation Information, but only if you would otherwise
+ be required to provide such information under section 6 of the
+ GNU GPL, and only to the extent that such information is
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+ Combined Work produced by recombining or relinking the
+ Application with a modified version of the Linked Version. (If
+ you use option 4d0, the Installation Information must accompany
+ the Minimal Corresponding Source and Corresponding Application
+ Code. If you use option 4d1, you must provide the Installation
+ Information in the manner specified by section 6 of the GNU GPL
+ for conveying Corresponding Source.)
+
+ 5. Combined Libraries.
+
+ You may place library facilities that are a work based on the
+Library side by side in a single library together with other library
+facilities that are not Applications and are not covered by this
+License, and convey such a combined library under terms of your
+choice, if you do both of the following:
+
+ a) Accompany the combined library with a copy of the same work based
+ on the Library, uncombined with any other library facilities,
+ conveyed under the terms of this License.
+
+ b) Give prominent notice with the combined library that part of it
+ is a work based on the Library, and explaining where to find the
+ accompanying uncombined form of the same work.
+
+ 6. Revised Versions of the GNU Lesser General Public License.
+
+ The Free Software Foundation may publish revised and/or new versions
+of the GNU Lesser General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+ Each version is given a distinguishing version number. If the
+Library as you received it specifies that a certain numbered version
+of the GNU Lesser General Public License "or any later version"
+applies to it, you have the option of following the terms and
+conditions either of that published version or of any later version
+published by the Free Software Foundation. If the Library as you
+received it does not specify a version number of the GNU Lesser
+General Public License, you may choose any version of the GNU Lesser
+General Public License ever published by the Free Software Foundation.
+
+ If the Library as you received it specifies that a proxy can decide
+whether future versions of the GNU Lesser General Public License shall
+apply, that proxy's public statement of acceptance of any version is
+permanent authorization for you to choose that version for the
+Library.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..726a6e2
--- /dev/null
+++ b/README.md
@@ -0,0 +1,29 @@
+This is a light Rust wrapper around the WildMIDI software synthesizer library.
+
+
+# Examples
+
+Included in this repository is a binary project exposing a very basic MIDI
+player - essentially a clone of wildmidi(1) that is missing a majority of the
+features.
+
+```
+$ cd examples/player/
+$ cargo run /tmp/D_E1A1.MID
+```
+
+
+# Tests
+
+The WildMIDI C library maintains some global state, so tests should **not** be
+run in parallel. Running tests consecutively can be achieved by invoking
+cargo-test as:
+
+```
+cargo test -- --test-threads=1
+```
+
+
+# TODO
+
+- [ ] Valid MIDI blob for use in testing 'load' and the methods of 'Midi'.
diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..18b479c
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,7 @@
+fn link_wildmidi() {
+ println!("cargo:rustc-flags=-l WildMidi");
+}
+
+fn main() {
+ link_wildmidi();
+}
diff --git a/examples/player/.gitignore b/examples/player/.gitignore
new file mode 100644
index 0000000..53eaa21
--- /dev/null
+++ b/examples/player/.gitignore
@@ -0,0 +1,2 @@
+/target
+**/*.rs.bk
diff --git a/examples/player/Cargo.toml b/examples/player/Cargo.toml
new file mode 100644
index 0000000..98b68b3
--- /dev/null
+++ b/examples/player/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "wildmidi-player"
+version = "0.1.0"
+authors = ["Jakob L. Kreuze <jakob@memeware.net>"]
+
+[dependencies]
+ao_rs = "0.1.5"
+wildmidi = { path = "../../", version = "0.1" }
diff --git a/examples/player/src/main.rs b/examples/player/src/main.rs
new file mode 100644
index 0000000..c52a06c
--- /dev/null
+++ b/examples/player/src/main.rs
@@ -0,0 +1,66 @@
+// Copyright (C) 2018 Jakob L. Kreuze, All Rights Reserved.
+//
+// This file is part of wildmidi.
+//
+// wildmidi is free software: you can redistribute it and/or modify it under the
+// terms of the GNU Lesser General Public License as published by the Free
+// Software Foundation, either version 3 of the License, or (at your option) any
+// later version.
+//
+// wildmidi is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+// A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
+// details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with wildmidi. If not, see <http://www.gnu.org/licenses/>.
+
+extern crate ao_rs as ao;
+extern crate wildmidi;
+
+use std::env::args;
+use std::mem::transmute;
+use std::path::Path;
+use std::process::exit;
+
+use ao::{Ao, Device, Driver, Format};
+use wildmidi::Player;
+
+fn main() {
+ let args: Vec<String> = args().collect();
+
+ if args.len() != 2 {
+ println!("usage: {} [MIDI]", args[0]);
+ exit(1);
+ }
+
+ let path = &args[1];
+
+ if !Path::new(&path).exists() {
+ println!("{} does not exist.", path);
+ exit(1);
+ }
+
+ let player = Player::new(44100).unwrap();
+ let mut midi = player.load_file(&path).unwrap();
+
+ let _ao = Ao::new();
+ let driver = Driver::new().unwrap();
+ let format = Format::new();
+ let device = Device::new(&driver, &format, None).unwrap();
+
+ loop {
+ // It would simply be too slow to do a safe conversion every time we
+ // buffer the PCM output.
+ let vec = midi.play(4096);
+ let pcm = unsafe {
+ transmute::<&[u8], &[i8]>(&vec[..])
+ };
+
+ if pcm.len() <= 0 {
+ break;
+ }
+
+ device.play(&pcm[..] as &[i8]);
+ }
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..436bcbe
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,220 @@
+// Copyright (C) 2018 Jakob L. Kreuze, All Rights Reserved.
+//
+// This file is part of wildmidi.
+//
+// wildmidi is free software: you can redistribute it and/or modify it under the
+// terms of the GNU Lesser General Public License as published by the Free
+// Software Foundation, either version 3 of the License, or (at your option) any
+// later version.
+//
+// wildmidi is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+// A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
+// details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with wildmidi. If not, see <http://www.gnu.org/licenses/>.
+
+#[macro_use]
+extern crate simple_error;
+
+use std::error::Error;
+use std::ffi::CString;
+use std::os::raw::{c_char, c_uchar, c_ushort, c_int, c_ulong, c_void};
+use std::path::Path;
+
+extern "C" {
+ // "Methods" of the Midi player.
+ fn WildMidi_Init(cfg: *const c_char, rate: c_ushort, flags: c_ushort) -> c_int;
+ fn WildMidi_Open(path: *const c_char) -> *const c_void;
+ fn WildMidi_OpenBuffer(data: *const c_uchar, size: c_ulong) -> *const c_void;
+ // fn WildMidi_SetOption();
+ fn WildMidi_MasterVolume(volume: c_uchar) -> c_int;
+ fn WildMidi_Shutdown();
+
+ // "Methods" of the individual Midi handles.
+ fn WildMidi_Close(ptr: *const c_void) -> c_int;
+ fn WildMidi_FastSeek(ptr: *const c_void, pos: c_ushort) -> c_int;
+ fn WildMidi_GetOutput(ptr: *const c_void, buf: *mut c_uchar, len: c_ulong) -> c_int;
+}
+
+/// Loader for the Midi format.
+pub struct Player;
+
+impl Player {
+ fn locate_cfg() -> Option<&'static str> {
+ let paths = vec![
+ "/etc/wildmidi/wildmidi.cfg",
+ "/etc/wildmidi.cfg"
+ ];
+
+ for path in paths.iter() {
+ if Path::new(path).exists() {
+ return Some(path);
+ }
+ }
+
+ None
+ }
+
+ /// Create a new Player with the given sample rate, using the default
+ /// configuration file.
+ ///
+ /// # Errors
+ ///
+ /// Will fail if 'rate' is not on the interval [11025,65535], or if neither
+ /// of the default configuration files exist ('/etc/wildmidi/wildmidi.cfg',
+ /// '/etc/wildmidi.cfg').
+ pub fn new(rate: u16) -> Result<Player, Box<Error>> {
+ let cfg = match Player::locate_cfg() {
+ Some(cfg) => cfg,
+ None => bail!("No valid configuration file found"),
+ };
+
+ Player::with_cfg(cfg, rate)
+ }
+
+ /// Create a new Player with the given config path and sample rate.
+ ///
+ /// # Errors
+ ///
+ /// Will fail if 'rate' is not on the interval [11025,65535].
+ pub fn with_cfg(cfg: &str, rate: u16) -> Result<Player, Box<Error>> {
+ let cfg = CString::new(cfg)?;
+
+ unsafe {
+ // WildMidi_Shutdown();
+ if WildMidi_Init(cfg.as_ptr(), rate, 0) != 0 {
+ bail!("Couldn't initialize WildMidi.");
+ }
+ }
+
+ Ok(Player { })
+ }
+
+ // TODO: Document this.
+ pub fn volume(&mut self, volume: u8) -> Result<(), Box<Error>> {
+ unsafe {
+ if WildMidi_MasterVolume(volume) != 0 {
+ bail!("Couldn't set volume.");
+ }
+ }
+
+ Ok(())
+ }
+
+ /// Loads a Midi file from memory.
+ ///
+ /// # Errors
+ ///
+ /// Will fail if an internal error occurs in WildMidi (such as a parse
+ /// error).
+ pub fn load(&self, data: &[u8]) -> Result<Midi, Box<Error>> {
+ unsafe {
+ let len = data.len() as c_ulong;
+ let ptr = WildMidi_OpenBuffer(data.as_ptr(), len);
+
+ if !ptr.is_null() {
+ return Ok(Midi::new(ptr));
+ }
+ }
+
+ bail!("Failed to open Midi file.")
+ }
+
+ /// Loads a Midi file from disk.
+ ///
+ /// # Errors
+ ///
+ /// Will fail if the file does not exist, or if an internal error occurs in
+ /// WildMidi (such as a parse error).
+ pub fn load_file(&self, path: &str) -> Result<Midi, Box<Error>> {
+ if !Path::new(path).exists() {
+ bail!("File does not exist");
+ }
+
+ let path = CString::new(path)?;
+
+ unsafe {
+ let ptr = WildMidi_Open(path.as_ptr());
+
+ if !ptr.is_null() {
+ return Ok(Midi::new(ptr));
+ }
+ }
+
+ bail!("Failed to open Midi file.")
+ }
+}
+
+impl Drop for Player {
+ fn drop(&mut self) {
+ unsafe {
+ WildMidi_Shutdown();
+ }
+ }
+}
+
+/// An actual Midi file, capable of producing a PCM output.
+pub struct Midi {
+ ptr: *const c_void,
+}
+
+impl Midi {
+ fn new(ptr: *const c_void) -> Midi {
+ Midi { ptr }
+ }
+
+ /// Returns a Vec<u8> containing 'len' bytes of PCM data.
+ pub fn play(&mut self, len: usize) -> Vec<u8> {
+ let mut vec = vec![0;len];
+
+ unsafe {
+ let buf = vec.as_mut_ptr();
+ let handle = self.ptr;
+ let read = WildMidi_GetOutput(handle, buf, len as c_ulong) as usize;
+
+ if read < len {
+ vec.resize(read, 0);
+ }
+ }
+
+ vec
+ }
+
+ // TODO: Document this.
+ pub fn seek(&mut self, pos: u32) {
+ unsafe {
+ // FIXME: Doesn't check return value.
+ WildMidi_FastSeek(self.ptr, pos as c_ushort);
+ }
+ }
+}
+
+impl Drop for Midi {
+ fn drop(&mut self) {
+ unsafe {
+ // There isn't much of a point in handling errors here.
+ WildMidi_Close(self.ptr);
+ }
+ }
+}
+
+#[cfg(test)]
+mod player_tests {
+ use ::*;
+
+ #[test]
+ fn create() {
+ if let Err(e) = Player::new(44100) {
+ panic!("{}", e);
+ }
+ }
+
+ #[test]
+ fn invalid_rate() {
+ if let Ok(_) = Player::new(0) {
+ panic!("Allowed player to be created with invalid rate.");
+ }
+ }
+}