add tapedelay cmd (broken)

doc/README.md

@@ -288,3 +288,26 @@ GVerb algorithm from SWH plugins.
  - drylevel (dB): -70..0, default 0
  - earlylevel (dB): -70..0, default 0
  - taillevel (dB): -70..0, default -17.5
+
+## `invert split index`
+
+> A utility plugin that inverts the signal, also (wrongly) known as a 180 degree phase shift.
+
+## `tapedelay split index`
+
+**TODO:** gives 0 output
+
+> Correctly models the tape motion and some of the smear effect, there is no simulation fo the head saturation yet, as I don't have a good model of it. When I get one I will add it.
+
+> The way the tape accelerates and decelerates gives a nicer delay effect for many purposes.
+
+ - speed (inches/sec, 1=normal): 0..10, default 1
+ - da\_db (dry level, dB): -90..0, default -90
+ - t1d (tap 1 distance, inches): 0..4, default 0
+ - t1a\_db (tap 1 level, dB): -90..0, default 0
+ - t2d (tap 2 distance, inches): 0..4, default 1
+ - t2a\_db (tap 2 level, dB): -90..0, default -90
+ - t3d (tap 3 distance, inches): 0..4, default 2
+ - t3a\_db (tap 3 level, dB): -90..0, default -90
+ - t4d (tap 4 distance, inches): 0..4, default 3
+ - t4a\_db (tap 4 level, dB): -90..0, default -90

examples/invert.scri

@@ -0,0 +1,3 @@
+load :0;
+invert 3 1;
+quicksave;

examples/tapedelay.scri

@@ -0,0 +1,3 @@
+load :0;
+tapedelay 3 1 1 -90 0 0 1 -90 2 -90 3 -90;
+quicksave;

src/lang.zig

@@ -36,6 +36,8 @@ pub const CommandType = enum {
     ThruZero,
     Foverdrive,
     Gverb,
+    Invert,
+    TapeDelay,
 
     Noise,
     WildNoise,
@@ -201,6 +203,8 @@ pub const Lang = struct {
         _ = try self.keywords.put("thruzero", .ThruZero);
         _ = try self.keywords.put("foverdrive", .Foverdrive);
         _ = try self.keywords.put("gverb", .Gverb);
+        _ = try self.keywords.put("invert", .Invert);
+        _ = try self.keywords.put("tapedelay", .TapeDelay);
 
         // custom implementations (not lv2)
         _ = try self.keywords.put("noise", .Noise);

src/printer.zig

@@ -30,6 +30,8 @@ pub fn printList(list: langs.CommandList, stream: var) !void {
             .ThruZero => "thruzero",
             .Foverdrive => "foverdrive",
             .Gverb => "gverb",
+            .Invert => "invert",
+            .TapeDelay => "tapedelay",
 
             .Noise => "noise",
             .WildNoise => "wildnoise",

src/runner.zig

@@ -344,6 +344,16 @@ pub const Runner = struct {
         try image.runPlugin("http://plugin.org.uk/swh-plugins/gverb", pos, params);
     }
 
+    fn invertCmd(self: *Runner, pos: Position, params: ParamList) !void {
+        var image = try self.getImage();
+        try image.runPlugin("http://plugin.org.uk/swh-plugins/inv", pos, params);
+    }
+
+    fn tapedelayCmd(self: *Runner, pos: Position, params: ParamList) !void {
+        var image = try self.getImage();
+        try image.runPlugin("http://plugin.org.uk/swh-plugins/tapeDelay", pos, params);
+    }
+
     fn runCommand(self: *Runner, cmd: *lang.Command) !void {
         var params = ParamList.init(self.allocator);
         defer params.deinit();
@@ -629,6 +639,31 @@ pub const Runner = struct {
                 try self.gverbCmd(pos, params);
             },
 
+            .Invert => {
+                const pos = try cmd.consumePosition();
+                try self.gverbCmd(pos, params);
+            },
+
+            .TapeDelay => {
+                const pos = try cmd.consumePosition();
+                try cmd.appendParam(&params, "speed");
+                try cmd.appendParam(&params, "da_db");
+
+                try cmd.appendParam(&params, "t1d");
+                try cmd.appendParam(&params, "t1a_db");
+
+                try cmd.appendParam(&params, "t2d");
+                try cmd.appendParam(&params, "t2a_db");
+
+                try cmd.appendParam(&params, "t3d");
+                try cmd.appendParam(&params, "t3a_db");
+
+                try cmd.appendParam(&params, "t4d");
+                try cmd.appendParam(&params, "t4a_db");
+
+                try self.tapedelayCmd(pos, params);
+            },
+
             else => blk: {
                 std.debug.warn("Unsupported command: {}\n", .{cmd.command});
                 break :blk RunError.UnknownCommand;