change mono plugin check to a 3+ channel plugin check

i'm not sure if there's anyone with more than two ears who is biological

doc/README.md

@@ -104,7 +104,7 @@ Parameters:
  - `gain`: Gain, 0..12, default 0
  - `noClip`: Soft Clip (assumed boolean), 0..1, default 0
 
-## `delay seed gain`
+## `delay seed gain feedback_pc tap_count first_delay delay_range delay_scale delay_rand_pc gain_scale wet`
 
 Parameters:
  - `seed`: Random seed, 0..1000, default 0
@@ -118,10 +118,25 @@ Parameters:
  - `gain_scale`: Amplitude change, 0.2..5, default 1
  - `wet`: Dry/wet mix, 0..1, default 1
 
+## TODO `vinyl split index year warp click wear`
+
+VyNil effect from SWH.
+
+Parameters:
+ - `year`: Year (int), 1900..1990, default 1990
+ - `rpm`: RPM (int), 33..78, default 33
+ - `warp`: Surface Warping, 0..1, default 0
+ - `click`: Crackle, 0..1, default 0
+ - `wear`: Wear, 0..1, default 0
+
 ## TODO `echo split index delay`
 
 Run an echo filter on the given loaded file.
 
+## TODO `noise split index seed`
+
+Inject white noise on the image.
+
 ## `quicksave`
 
 Save the file on the same directory of the file specified by `load`, but

examples/vinyl.scri

@@ -0,0 +1,3 @@
+load :0;
+vinyl 3 1 1990 33 0 0 0;
+quicksave;

src/image.zig

@@ -212,12 +212,12 @@ pub const Image = struct {
 
         var ports = try lv2.setupPorts(&ctx);
 
-        if (ctx.n_audio_in != 1) {
-            std.debug.warn("plugin <{}> does not accept mono input.\n", plugin_uri);
+        if (ctx.n_audio_in > 2) {
+            std.debug.warn("plugin <{}> accepts more than two channels.\n", plugin_uri);
             return ImageError.InvalidPlugin;
         }
 
-        // TODO check n_audio_out
+        // TODO check n_audio_out > 2
 
         // now, for each param for the plugin, we find its port, and set
         // the value for the port there.

src/lang.zig

@@ -24,6 +24,7 @@ pub const CommandType = enum {
     Reverb,
     Highpass,
     Delay,
+    Vinyl,
 };
 
 pub const Command = struct {
@@ -139,6 +140,7 @@ pub const Lang = struct {
         _ = try self.keywords.put("reverb", .Reverb);
         _ = try self.keywords.put("highpass", .Highpass);
         _ = try self.keywords.put("delay", .Delay);
+        _ = try self.keywords.put("vinyl", .Vinyl);
     }
 
     pub fn parse(self: *Lang, data: []const u8) !CommandList {

src/plugin.zig

@@ -72,8 +72,14 @@ pub const RunContext = struct {
             return ImageError.InstantiateFail;
         }
 
+        // we allocate []f32 with size 2 to account for stereo plugins, however
+        // we only use &in_buf[0] and &out_buf[0], and don't use the
+        // (supposedly) right side of neither input or output.
+        var in_buf = try allocator.alloc(f32, 2);
+        std.mem.secureZero(f32, in_buf);
+
         return RunContext{
-            .in_buf = try allocator.alloc(f32, 1),
+            .in_buf = in_buf,
             .out_buf = try allocator.alloc(f32, 2),
             .instance = instance.?,
         };

src/runner.zig

@@ -235,6 +235,11 @@ pub const Runner = struct {
         try image.runPlugin("http://plugin.org.uk/swh-plugins/delayorama", pos, params);
     }
 
+    fn vinylCmd(self: *Runner, pos: Position, params: ParamList) !void {
+        var image = try self.getImage();
+        try image.runPlugin("http://plugin.org.uk/swh-plugins/vynil", pos, params);
+    }
+
     fn runCommand(self: *Runner, cmd: *lang.Command) !void {
         var params = ParamList.init(self.allocator);
         defer params.deinit();
@@ -350,6 +355,18 @@ pub const Runner = struct {
                 try self.delayCmd(pos, params);
             },
 
+            .Vinyl => blk: {
+                const pos = try cmd.consumePosition();
+
+                try cmd.appendParam(&params, "year");
+                try cmd.appendParam(&params, "rpm");
+                try cmd.appendParam(&params, "warp");
+                try cmd.appendParam(&params, "click");
+                try cmd.appendParam(&params, "wear");
+
+                try self.vinylCmd(pos, params);
+            },
+
             else => blk: {
                 std.debug.warn("Unsupported command: {}\n", cmd.command);
                 break :blk RunError.UnknownCommand;