add basic lilv instantiation support
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parent
fc69a3f62f
commit
25bef23933
3 changed files with 72 additions and 10 deletions
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@ -9,6 +9,7 @@ pub const ImageError = error{
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InvalidPlugin,
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UnknownPlugin,
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InvalidSymbol,
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InstantiateFail,
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};
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/// Low level integration function with libsndfile.
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@ -68,6 +69,17 @@ fn temporaryName(allocator: *std.mem.Allocator) ![]u8 {
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return error.TempGenFail;
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}
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fn mkSfInfo() c.SF_INFO {
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return c.SF_INFO{
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.frames = c_int(0),
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.samplerate = c_int(44100),
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.channels = c_int(1),
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.format = c.SF_FORMAT_ULAW | c.SF_FORMAT_RAW | c.SF_ENDIAN_BIG,
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.sections = c_int(0),
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.seekable = c_int(0),
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};
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}
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pub const Image = struct {
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allocator: *std.mem.Allocator,
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sndfile: *c.SNDFILE,
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@ -75,14 +87,7 @@ pub const Image = struct {
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/// Open a BMP file.
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pub fn open(allocator: *std.mem.Allocator, path: []const u8) !*Image {
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var in_fmt = c.SF_INFO{
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.frames = c_int(0),
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.samplerate = c_int(44100),
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.channels = c_int(1),
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.format = c.SF_FORMAT_ULAW | c.SF_FORMAT_RAW | c.SF_ENDIAN_BIG,
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.sections = c_int(0),
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.seekable = c_int(0),
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};
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var in_fmt = mkSfInfo();
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var sndfile = try sopen(allocator, path, c.SFM_READ, &in_fmt);
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var image = try allocator.create(Image);
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@ -174,5 +179,12 @@ pub const Image = struct {
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// running the plugin on that file
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var tmpnam = try temporaryName(self.allocator);
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std.debug.warn("temporary name: {}\n", tmpnam);
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var out_fmt = mkSfInfo();
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var out_file = try sopen(self.allocator, tmpnam, c.SFM_WRITE, &out_fmt);
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var rctx = try plugins.RunContext.init(self.allocator, ctx.plugin);
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rctx.connectPorts(ports);
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lv2.lilv_instance_activate(rctx.instance);
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}
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};
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@ -1,6 +1,7 @@
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const std = @import("std");
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const c = @import("lv2_helpers.zig").c;
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const lv2 = @import("lv2_helpers.zig");
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const c = lv2.c;
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const ImageError = @import("image.zig").ImageError;
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@ -26,13 +27,59 @@ pub const Position = struct {
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pub const Context = struct {
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allocator: *std.mem.Allocator,
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world: *c.LilvWorld,
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plugin: ?*const c.LilvPlugin,
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plugin: *const c.LilvPlugin,
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// they should both be 1.
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n_audio_in: usize = 0,
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n_audio_out: usize = 0,
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};
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/// Represents the specific run context of plugin instantation.
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pub const RunContext = struct {
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in_buf: []f32,
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out_buf: []f32,
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instance: *c.LilvInstance,
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pub fn init(
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allocator: *std.mem.Allocator,
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plugin: *const c.LilvPlugin,
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) !RunContext {
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var instance = c.lilv_plugin_instantiate(plugin, f64(44100), null);
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if (instance == null) {
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return ImageError.InstantiateFail;
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}
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return RunContext{
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.in_buf = try allocator.alloc(f32, 1),
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.out_buf = try allocator.alloc(f32, 1),
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.instance = instance.?,
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};
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}
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pub fn connectPorts(self: *RunContext, ports: []*lv2.Port) void {
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var i: usize = 0;
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var o: usize = 0;
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for (ports) |port, p_idx| {
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var p = @intCast(u32, p_idx);
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switch (port.ptype) {
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.Control => lv2.lilv_instance_connect_port(self.instance, p, &port.value),
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.Audio => blk: {
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if (port.is_input) {
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lv2.lilv_instance_connect_port(self.instance, p, &self.in_buf[i]);
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i += 1;
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} else {
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lv2.lilv_instance_connect_port(self.instance, p, &self.out_buf[o]);
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o += 1;
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}
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},
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else => lv2.lilv_instance_connect_port(self.instance, p, null),
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}
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}
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}
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};
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pub fn makeContext(allocator: *std.mem.Allocator, plugin_uri: []const u8) !Context {
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const cstr_plugin_uri = try std.cstr.addNullByte(allocator, plugin_uri);
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var world = c.lilv_world_new().?;
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@ -148,6 +148,9 @@ pub const Runner = struct {
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try params.append(plugin.Param{ .sym = "gain", .value = gain });
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defer params.deinit();
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// TODO if we could detect that the next command is a quicksave then
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// we don't need the temporary file in runPlugin and instead we
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// dump it all on the output image for it.
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try image.runPlugin(
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"http://lv2plug.in/plugins/eg-amp",
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plugin.Position{ .split = split, .index = index },
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