finish custom plugins impl, finish noise cmd

- add ParamMap

examples/noise.scri

@@ -1,3 +1,5 @@
 load :0;
-noise 3 1;
+noise 5 1 3981 10000;
+noise 5 2 3982 0;
+noise 5 3 3982 5;
 quicksave;

src/custom.zig

@@ -8,21 +8,45 @@ const c = lv2.c;
 const RunBuffers = plugins.RunBuffers;
 
 pub const RandomNoise = struct {
-    allocator: *std.mem.Allocator,
     r: std.rand.DefaultPrng,
+    rand_buf: ?[]f32,
+    cnt: usize = 0,
 
     pub fn init(
         allocator: *std.mem.Allocator,
-    ) RandomNoise {
-        var r = std.rand.DefaultPrng.init(std.time.timestamp());
+        params: *plugins.ParamMap,
+    ) !RandomNoise {
+        const seed = @floatToInt(u64, params.get("seed").?.value);
+        const fillbytes = @floatToInt(usize, params.get("fill_bytes").?.value);
 
-        return RandomNoise{
-            .allocator = allocator,
-            .r = r,
-        };
+        var r = std.rand.DefaultPrng.init(seed);
+
+        if (fillbytes > 0) {
+            var rand_buf = try allocator.alloc(f32, fillbytes);
+
+            for (rand_buf) |_, idx| {
+                rand_buf[idx] = r.random.float(f32);
+            }
+
+            return RandomNoise{
+                .r = r,
+                .rand_buf = rand_buf,
+            };
+        } else {
+            return RandomNoise{
+                .r = r,
+                .rand_buf = null,
+            };
+        }
     }
 
     pub fn run(self: *RandomNoise, bufs: *RunBuffers) void {
-        bufs.out[0] = self.r.random.float(f32);
+        if (self.rand_buf) |rand_buf| {
+            if (self.cnt >= rand_buf.len) self.cnt = 0;
+            bufs.out[0] = rand_buf[self.cnt];
+            self.cnt += 1;
+        } else {
+            bufs.out[0] = self.r.random.float(f32);
+        }
     }
 };

src/image.zig

@@ -62,7 +62,7 @@ fn getEndPos(path: []const u8) !usize {
 
 fn temporaryName(allocator: *std.mem.Allocator) ![]u8 {
     const template_start = "/temp/temp_";
-    const template = "/tmp/temp_XXXXXX";
+    const template = "/tmp/temp_XXXXXXXX";
     var nam = try allocator.alloc(u8, template.len);
     std.mem.copy(u8, nam, template);
 
@@ -333,8 +333,81 @@ pub const Image = struct {
     pub fn runCustomPlugin(
         self: *Image,
         comptime Plugin: type,
-        pos: plugins.Position,
-    ) void {
-        var plugin = Plugin.init(self.allocator);
+        position: plugins.Position,
+        params: *plugins.ParamMap,
+    ) !void {
+        var plugin = try Plugin.init(self.allocator, params);
+
+        // the code here is a copypaste of runPlugin() without the specific
+        // lilv things.
+        var tmpnam = try temporaryName(self.allocator);
+        std.debug.warn("\trunning CUSTOM plugin from '{}' to '{}'\n", self.curpath, tmpnam);
+
+        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();
+
+        const file_end = try getEndPos(self.curpath);
+        const seek_pos = position.seekPos(file_end);
+        std.debug.warn("\tstart {} end {}\n", seek_pos.start, seek_pos.end);
+
+        // make sure we start from 0
+        _ = c.sf_seek(self.sndfile, 0, c.SEEK_SET);
+
+        // there are four main stages:
+        // - the bmp header copy
+        // - pre-plugin
+        // - CUSTOM plugin
+        // - post-plugin
+
+        var file_copy_buf = try self.allocator.alloc(f32, BufferSize);
+        defer self.allocator.free(file_copy_buf);
+
+        // pre-plugin copy, merged with bmp header copy
+        try self.copyBytes(
+            out_file,
+            file_copy_buf,
+            usize(0),
+            seek_pos.start + @mod(seek_pos.start, BufferSize),
+        );
+
+        _ = c.sf_seek(self.sndfile, @intCast(i64, seek_pos.start), c.SEEK_SET);
+
+        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;
+
+        while (i <= seek_pos.end) : (i += 1) {
+            const read_bytes = c.sf_readf_float(self.sndfile, bufs.in.ptr, 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);
+        }
+
+        _ = c.sf_seek(self.sndfile, @intCast(i64, seek_pos.end), c.SEEK_SET);
+
+        // post-plugin copy
+        try self.copyBytes(
+            out_file,
+            file_copy_buf,
+            seek_pos.end + 1,
+            file_end + @mod(file_end, BufferSize),
+        );
+
+        c.sf_write_sync(out_file);
+        _ = c.sf_close(out_file);
+        _ = c.sf_close(self.sndfile);
+
+        // reopen the file as SFM_READ so we can run plugin chains etc
+        self.sndfile = try sopen(self.allocator, tmpnam, c.SFM_READ, &out_fmt);
+        self.curpath = tmpnam;
     }
 };

src/lang.zig

@@ -107,6 +107,16 @@ pub const Command = struct {
             .value = val,
         });
     }
+
+    pub fn appendParamMap(
+        self: *Command,
+        map: *plugin.ParamMap,
+        symbol: []const u8,
+    ) !void {
+        var val = try self.floatArgAt(self.cur_idx);
+        self.cur_idx += 1;
+        _ = try map.put(symbol, val);
+    }
 };
 
 pub const CommandList = std.ArrayList(*Command);

src/plugin.zig

@@ -16,6 +16,7 @@ pub const Param = struct {
 
 /// List of parameters to be set to control ports.
 pub const ParamList = std.ArrayList(Param);
+pub const ParamMap = std.AutoHashMap([]const u8, f32);
 
 /// Represents an absolute position in the image.
 pub const SeekPos = struct {

src/runner.zig

@@ -6,6 +6,7 @@ const custom = @import("custom.zig");
 
 const Position = plugin.Position;
 const ParamList = plugin.ParamList;
+const ParamMap = plugin.ParamMap;
 
 const Image = images.Image;
 
@@ -246,15 +247,18 @@ pub const Runner = struct {
         try image.runPlugin("http://plugin.org.uk/swh-plugins/revdelay", pos, params);
     }
 
-    fn noiseCmd(self: *Runner, pos: Position, params: ParamList) !void {
+    fn noiseCmd(self: *Runner, pos: Position, map: *ParamMap) !void {
         var image = try self.getImage();
-        image.runCustomPlugin(custom.RandomNoise, pos);
+        try image.runCustomPlugin(custom.RandomNoise, pos, map);
     }
 
     fn runCommand(self: *Runner, cmd: *lang.Command) !void {
         var params = ParamList.init(self.allocator);
         defer params.deinit();
 
+        var map = ParamMap.init(self.allocator);
+        defer map.deinit();
+
         return switch (cmd.command) {
             .Noop => {},
             .Load => blk: {
@@ -392,7 +396,11 @@ pub const Runner = struct {
 
             .Noise => blk: {
                 const pos = try cmd.consumePosition();
-                try self.noiseCmd(pos, params);
+
+                try cmd.appendParamMap(&map, "seed");
+                try cmd.appendParamMap(&map, "fill_bytes");
+
+                try self.noiseCmd(pos, &map);
             },
 
             else => blk: {