add dyncomp example file

doc/README.md

@@ -245,3 +245,16 @@ other presets:
  - dry: 0..1, default 0
  - carrier: 0..1, default 0
  - quality: 0..1, default 1
+
+## `dyncomp split index enable hold inputgain threshold ratio attack release gain_min gain_max rms`
+
+ - enable (bool): 0..1, default 1
+ - hold (bool): 0..1, default 0
+ - inputgain (dB): -10..30, default 0
+ - threshold (dB): -50..-10, default -30
+ - ratio (???): 0..1, default 0
+ - attack (seconds): 0.001..0.1, default 0.01
+ - release (seconds): 0.03..3.0, default 0.3
+ - gain\_min (dB): -20..40
+ - gain\_max (dB): -20..40
+ - rms (signal level, dB): -80..10

examples/degrade.scri

@@ -1,5 +1,8 @@
 load :0;
-degrade 5 1 0.8 0.5 0.65 0.9 0.58 0.5;
-degrade 5 2 0.1 1 0.65 0.5 0.5 0.4;
-degrade 5 3 0.1 1 0.65 0.9 0.58 0.5;
+degrade 8 1 0.8 0.5 0.65 0.9 0.58 0.5;
+degrade 8 2 0.1 1 0.65 0.5 0.5 0.4;
+degrade 8 3 0.1 1 0.65 0.9 0.58 0.5;
+degrade 8 4 0 1 1 0 0 1;
+degrade 8 5 0 1 1 0 0 0;
+degrade 8 6 0 0 0 0 0 0;
 quicksave;

examples/dyncomp.scri

@@ -0,0 +1,3 @@
+load :0;
+dyncomp 3 1 1 0 0 -30 0 0.01 0.3 0 0 0;
+quicksave;

src/image.zig

@@ -370,18 +370,25 @@ pub const Image = struct {
         var i: usize = seek_pos.start;
         std.debug.warn("\tseek pos start: {} end: {}\n", .{ seek_pos.start, seek_pos.end });
 
-        var inbuf = rctx.buffers.in;
-        var outbuf = rctx.buffers.out;
+        var inbuf = &rctx.buffers.in;
+        var outbuf = &rctx.buffers.out;
 
         while (i <= seek_pos.end) : (i += 1) {
-            const read_bytes = c.sf_readf_float(self.sndfile, inbuf.ptr, 1);
+            inbuf[0] = 0;
+            inbuf[1] = 0;
+
+            const read_bytes = c.sf_readf_float(self.sndfile, inbuf, 1);
             if (read_bytes == 0) {
                 std.debug.warn("WARN! reached EOF at idx={}\n", .{i});
                 break;
             }
 
+            // trick plugins into having correct stereo signal from
+            // my mono input
+            inbuf[1] = inbuf[0];
+
             lv2.lilv_instance_run(rctx.instance, 1);
-            try swrite(out_file, outbuf.ptr, 1);
+            try swrite(out_file, outbuf, 1);
         }
 
         sseek(self.sndfile, seek_pos.end);
@@ -439,9 +446,7 @@ pub const Image = struct {
         var out_fmt = mkSfInfo();
         var out_file = try sopen(self.allocator, tmpnam, c.SFM_WRITE, &out_fmt);
 
-        var bufs = try plugins.RunBuffers.init(self.allocator);
-        defer bufs.deinit();
-
+        var bufs = plugins.RunBuffers{};
         const seek_pos = self.getSeekPos(position);
 
         // make sure we start from 0
@@ -465,18 +470,18 @@ pub const Image = struct {
         var i: usize = seek_pos.start;
         std.debug.warn("\tseek pos start: {} end: {}\n", .{ seek_pos.start, seek_pos.end });
 
-        var inbuf = bufs.in;
-        var outbuf = bufs.out;
+        var inbuf = &bufs.in;
+        var outbuf = &bufs.out;
 
         while (i <= seek_pos.end) : (i += 1) {
-            const read_bytes = c.sf_readf_float(self.sndfile, bufs.in.ptr, 1);
+            const read_bytes = c.sf_readf_float(self.sndfile, inbuf, 1);
             if (read_bytes == 0) {
                 std.debug.warn("WARN! reached EOF at idx={}\n", .{i});
                 break;
             }
 
             plugin.run(&bufs);
-            try swrite(out_file, bufs.out.ptr, 1);
+            try swrite(out_file, outbuf, 1);
         }
 
         sseek(self.sndfile, seek_pos.end);

src/lang.zig

@@ -32,6 +32,7 @@ pub const CommandType = enum {
     Degrade,
     RePsycho,
     TalkBox,
+    DynComp,
 
     Noise,
     WildNoise,
@@ -202,6 +203,7 @@ pub const Lang = struct {
         _ = try self.keywords.put("embed", .Embed);
         _ = try self.keywords.put("degrade", .Degrade);
         _ = try self.keywords.put("repsycho", .RePsycho);
+        _ = try self.keywords.put("dyncomp", .RePsycho);
 
         // even more custom
         _ = try self.keywords.put("rotate", .Rotate);

src/plugin.zig

@@ -61,29 +61,11 @@ pub const Context = struct {
 
 /// Specific run context for non-plugins.
 pub const RunBuffers = struct {
-    allocator: *std.mem.Allocator,
-
-    in: []f32,
-    out: []f32,
-
-    pub fn init(allocator: *std.mem.Allocator) !RunBuffers {
-        // 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 RunBuffers{
-            .allocator = allocator,
-            .in = in_buf,
-            .out = try allocator.alloc(f32, 2),
-        };
-    }
-
-    pub fn deinit(self: *RunBuffers) void {
-        self.allocator.free(self.in);
-        self.allocator.free(self.out);
-    }
+    // we use [2]f32 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.
+    in: [2]f32 = [_]f32{0} ** 2,
+    out: [2]f32 = [_]f32{0} ** 2,
 };
 
 /// Represents the specific run context of plugin instantation.
@@ -103,23 +85,19 @@ pub const RunContext = struct {
         }
 
         return RunContext{
-            .buffers = try RunBuffers.init(allocator),
+            .buffers = RunBuffers{},
             .instance = instance.?,
         };
     }
 
     pub fn deinit(self: *RunContext) void {
         c.lilv_instance_free(self.instance);
-        self.buffers.deinit();
     }
 
     pub fn connectPorts(self: *RunContext, ports: []lv2.Port) void {
         var i: usize = 0;
         var o: usize = 0;
 
-        var in_buf = self.buffers.in;
-        var out_buf = self.buffers.out;
-
         for (ports) |_, p_idx| {
             var p = @intCast(u32, p_idx);
             var port: *lv2.Port = &ports[p_idx];
@@ -128,10 +106,18 @@ pub const RunContext = struct {
                 .Control => lv2.lilv_instance_connect_port(self.instance, p, &port.value),
                 .Audio => blk: {
                     if (port.is_input) {
-                        lv2.lilv_instance_connect_port(self.instance, p, &in_buf[i]);
+                        lv2.lilv_instance_connect_port(
+                            self.instance,
+                            p,
+                            &self.buffers.in[i],
+                        );
                         i += 1;
                     } else {
-                        lv2.lilv_instance_connect_port(self.instance, p, &out_buf[o]);
+                        lv2.lilv_instance_connect_port(
+                            self.instance,
+                            p,
+                            &self.buffers.out[o],
+                        );
                         o += 1;
                     }
                 },

src/printer.zig

@@ -26,6 +26,7 @@ pub fn printList(list: langs.CommandList, stream: var) !void {
             .Degrade => "Degrade",
             .RePsycho => "repsycho",
             .TalkBox => "talkbox",
+            .DynComp => "dyncomp",
 
             .Noise => "noise",
             .WildNoise => "wildnoise",

src/runner.zig

@@ -324,6 +324,11 @@ pub const Runner = struct {
         try image.runPlugin("http://drobilla.net/plugins/mda/TalkBox", pos, params);
     }
 
+    fn dynCompCmd(self: *Runner, pos: Position, params: ParamList) !void {
+        var image = try self.getImage();
+        try image.runPlugin("http://gareus.org/oss/lv2/darc#mono", pos, params);
+    }
+
     fn runCommand(self: *Runner, cmd: *lang.Command) !void {
         var params = ParamList.init(self.allocator);
         defer params.deinit();
@@ -566,6 +571,22 @@ pub const Runner = struct {
                 try cmd.appendParam(&params, "quality");
                 try self.talkboxCmd(pos, params);
             },
+
+            .DynComp => {
+                const pos = try cmd.consumePosition();
+                try cmd.appendParam(&params, "enable");
+                try cmd.appendParam(&params, "hold");
+                try cmd.appendParam(&params, "inputgain");
+                try cmd.appendParam(&params, "threshold");
+                try cmd.appendParam(&params, "ratio");
+                try cmd.appendParam(&params, "attack");
+                try cmd.appendParam(&params, "release");
+                try cmd.appendParam(&params, "gain_min");
+                try cmd.appendParam(&params, "gain_max");
+                try cmd.appendParam(&params, "rms");
+                try self.dynCompCmd(pos, params);
+            },
+
             else => blk: {
                 std.debug.warn("Unsupported command: {}\n", .{cmd.command});
                 break :blk RunError.UnknownCommand;