60 lines
2.2 KiB
Zig
60 lines
2.2 KiB
Zig
const std = @import("std");
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const sysaudio = @import("sysaudio");
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pub fn main() !void {
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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defer _ = gpa.deinit();
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const allocator = gpa.allocator();
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var a = try sysaudio.Context.init(null, allocator, .{ .deviceChangeFn = deviceChange });
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defer a.deinit();
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try a.refresh();
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const device = a.defaultDevice(.playback) orelse return error.NoDevice;
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var p = try a.createPlayer(device, writeCallback, .{});
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defer p.deinit();
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try p.start();
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try p.setVolume(0.85);
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var buf: [16]u8 = undefined;
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while (true) {
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std.debug.print("( paused = {}, volume = {d} )\n> ", .{ p.paused(), try p.volume() });
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const line = (try std.io.getStdIn().reader().readUntilDelimiterOrEof(&buf, '\n')) orelse break;
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var iter = std.mem.split(u8, line, ":");
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const cmd = std.mem.trimRight(u8, iter.first(), &std.ascii.whitespace);
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if (std.mem.eql(u8, cmd, "vol")) {
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var vol = try std.fmt.parseFloat(f32, std.mem.trim(u8, iter.next().?, &std.ascii.whitespace));
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try p.setVolume(vol);
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} else if (std.mem.eql(u8, cmd, "pause")) {
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try p.pause();
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try std.testing.expect(p.paused());
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} else if (std.mem.eql(u8, cmd, "play")) {
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try p.play();
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try std.testing.expect(!p.paused());
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} else if (std.mem.eql(u8, cmd, "exit")) {
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break;
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}
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}
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}
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const pitch = 440.0;
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const radians_per_second = pitch * 2.0 * std.math.pi;
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var seconds_offset: f32 = 0.0;
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fn writeCallback(self_opaque: *anyopaque, n_frame: usize) void {
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var self = @ptrCast(*sysaudio.Player, @alignCast(@alignOf(sysaudio.Player), self_opaque));
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const seconds_per_frame = 1.0 / @intToFloat(f32, self.sampleRate());
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var frame: usize = 0;
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while (frame < n_frame) : (frame += 1) {
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const sample = std.math.sin((seconds_offset + @intToFloat(f32, frame) * seconds_per_frame) * radians_per_second);
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self.writeAll(frame, sample);
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}
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seconds_offset = @mod(seconds_offset + seconds_per_frame * @intToFloat(f32, n_frame), 1.0);
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}
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fn deviceChange(self: ?*anyopaque) void {
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_ = self;
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std.debug.print("Device change detected!\n", .{});
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}
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