121 lines
No EOL
2.7 KiB
Zig
121 lines
No EOL
2.7 KiB
Zig
const std = @import("std");
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const math = std.math;
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const print = std.debug.print;
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const ArrayList = std.ArrayList;
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const Endian = std.builtin.Endian;
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const SoundNode = @import("soundnode.zig").SoundNode;
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const Activity = @import("activity.zig").Activity;
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const SoundSettings = @import("settings.zig").SoundSettings;
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pub fn singleSineTick(st: *SoundSettings, freq: u16, t: u64) f64 {
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const ft: f64 = @floatFromInt(t);
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const fr: f64 = @floatFromInt(freq);
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return math.sin(st.sine_multiplier * fr * ft);
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//return math.sin(st.sine_multiplier * @as(f64, freq) * ft);
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}
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pub fn main() !void {
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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const allocator = gpa.allocator();
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var settings: SoundSettings = SoundSettings{};
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const start_tick: u64 = 0;
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const end_tick: u64 = 44100 * 2;
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var sn1: SoundNode = try SoundNode.init(allocator, "sine");
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defer sn1.deinit();
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var a = Activity{
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.start_tick = 0,
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.end_tick = 0,
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.opcode = 1,
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.soundnode = &sn1,
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.operands = undefined,
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};
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try sn1.activities.append(&a);
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var soundnodes = ArrayList(*SoundNode).init(allocator);
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defer soundnodes.deinit();
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try soundnodes.append(&sn1);
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var tick: u64 = start_tick;
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//STARTING WAV
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const stdout_file = std.io.getStdOut().writer();
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var bw = std.io.bufferedWriter(stdout_file);
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const stdout = bw.writer();
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//WRITING WAV HEADER
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try stdout.writeAll("RIFF");
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try stdout.writeInt(
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u64,
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36 + (end_tick * 2 * settings.sample_width),
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Endian.little,
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);
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try stdout.writeAll("WAVE");
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try stdout.writeAll("fmt ");
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try stdout.writeInt(u32, 16, Endian.little);
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try stdout.writeInt(u16, 1, Endian.little);
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try stdout.writeInt(u16, 2, Endian.little);
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try stdout.writeInt(u32, settings.sample_rate, Endian.little);
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const block_align: u16 = @intCast(2 * settings.sample_width);
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try stdout.writeInt(u32, @as(u32, block_align) * settings.sample_rate, Endian.little);
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try stdout.writeInt(u16, block_align, Endian.little);
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try stdout.writeInt(u16, settings.bit_depth, Endian.little);
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try stdout.writeAll("data");
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try stdout.writeInt(
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u64,
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end_tick * 2 * settings.sample_width,
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Endian.little,
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);
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var sample: i24 = 0.0;
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while (tick < end_tick) {
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for (soundnodes.items, 0..) |soundnode, i| {
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for (soundnode.activities.items, 0..) |activity, j| {
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try activity.do();
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_ = j;
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}
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var amp: f64 = 0;
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var it = soundnode.freqmap.iterator();
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while (it.next()) |entry| {
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amp += entry.value_ptr.* * singleSineTick(&settings, @as(u16, entry.key_ptr.*), tick);
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}
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sample = @intFromFloat(amp * @as(f64, @floatFromInt(settings.max_amp)));
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try stdout.writeInt(i24, sample, Endian.little);
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try stdout.writeInt(i24, sample, Endian.little);
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_ = i;
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}
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tick += 1;
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}
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try bw.flush();
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} |