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fix: SDL3 Audio enabled again (poor sync)

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This commit is contained in:
Rekai Nyangadzayi Musuka
2025-11-12 16:16:10 -06:00
parent 5b2bd0b6b6
commit 53bb41e151
4 changed files with 32 additions and 39 deletions
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1
build.zig
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@@ -39,7 +39,6 @@ pub fn build(b: *std.Build) void {
// Later on we'll use this module as the root module of a test executable
// which requires us to specify a target.
.target = target,
.link_libc = true,
});
// Here we define an executable. An executable needs to have a root module

36
src/core/apu.zig
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@@ -247,7 +247,9 @@ pub const Apu = struct {
sampling_cycle: u2,
stream: *c.SDL_AudioStream,
// NB: This AudioStream is owned by platform.zig
stream: ?*c.SDL_AudioStream = null,
sched: *Scheduler,
fs: FrameSequencer,
@@ -273,7 +275,6 @@ pub const Apu = struct {
.sampling_cycle = 0b00,
.sched = sched,
.stream = undefined, // FIXME: bad practice
.capacitor = 0,
.fs = FrameSequencer.init(),
@@ -461,32 +462,23 @@ pub const Apu = struct {
if (self.sampling_cycle != self.bias.sampling_cycle.read()) self.replaceSDLResampler();
const ret = c.SDL_PutAudioStreamData(self.stream, &[2]i16{ @bitCast(ext_left ^ 0x8000), @bitCast(ext_right ^ 0x8000) }, 2 * @sizeOf(i16));
if (!ret) @panic("TODO: Failed to put i16s into SDL Audio Queue");
if (!ret) std.debug.panic("failed to append to sample queue. SDL Error: {s}", .{c.SDL_GetError()});
}
fn replaceSDLResampler(self: *Self) void {
@branchHint(.cold);
_ = self;
const sample_rate = Self.sampleRate(self.bias.sampling_cycle.read());
log.info("Sample Rate changed from {}Hz to {}Hz", .{ Self.sampleRate(self.sampling_cycle), sample_rate });
// @panic("TODO: Implement Multiple Sample Rates...");
self.sampling_cycle = self.bias.sampling_cycle.read();
// const sample_rate = Self.sampleRate(self.bias.sampling_cycle.read());
// log.info("Sample Rate changed from {}Hz to {}Hz", .{ Self.sampleRate(self.sampling_cycle), sample_rate });
const desired: c.SDL_AudioSpec = .{
.channels = 2,
.format = c.SDL_AUDIO_S16LE,
.freq = @intCast(Self.sampleRate(self.sampling_cycle)),
};
// // Sampling Cycle (Sample Rate) changed, Craete a new SDL Audio Resampler
// // FIXME: Replace SDL's Audio Resampler with either a custom or more reliable one
// const old_stream = self.stream;
// defer c.SDL_DestroyAudioStream(old_stream);
// self.sampling_cycle = self.bias.sampling_cycle.read();
// var desired: c.SDL_AudioSpec = std.mem.zeroes(c.SDL_AudioSpec);
// desired.format = c.SDL_AUDIO_S16;
// desired.channels = 2;
// desired.freq = @intCast(sample_rate);
// const new_stream = c.SDL_OpenAudioDeviceStream(c.SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, &desired, null, null) orelse @panic("TODO: Failed to replace SDL Audio Stream");
// self.stream = new_stream;
const ret = c.SDL_SetAudioStreamFormat(self.stream, &desired, null);
if (!ret) std.debug.panic("failed to change sample rate. SDL Error: {s}", .{c.SDL_GetError()});
}
fn interval(self: *const Self) u64 {

6
src/core/emu.zig
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@@ -160,13 +160,13 @@ pub fn runFrame(sched: *Scheduler, cpu: *Arm7tdmi) void {
}
}
fn audioSync(audio_sync: bool, stream: *c.SDL_AudioStream, is_buffer_full: *bool) void {
// comptime std.debug.assert(@import("../platform.zig").sample_format == SDL.AUDIO_U16);
fn audioSync(audio_sync: bool, stream: ?*c.SDL_AudioStream, is_buffer_full: *bool) void {
if (stream == null) return;
const sample_size = 2 * @sizeOf(u16);
const max_buf_size: c_int = 0x400;
_ = audio_sync;
_ = stream;
_ = is_buffer_full;
_ = sample_size;

28
src/platform.zig
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@@ -46,6 +46,8 @@ pub const Gui = struct {
allocator: Allocator,
pub fn init(allocator: Allocator, apu: *Apu, title_opt: ?*const [12]u8) !Self {
errdefer |err| if (err == error.sdl_error) log.err("SDL Error: {s}", .{c.SDL_GetError()});
c.SDL_SetMainReady();
try errify(c.SDL_Init(c.SDL_INIT_VIDEO | c.SDL_INIT_AUDIO | c.SDL_INIT_EVENTS));
@@ -200,16 +202,16 @@ pub const Gui = struct {
var zgui_redraw: bool = false;
switch (self.state.emulation) {
.Transition => |inner| switch (inner) {
.Transition => |target| switch (target) {
.Active => {
sync.paused.store(false, .monotonic);
// if (!config.config().host.mute) try errify(c.SDL_PauseAudioDevice(c.SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK));
if (!config.config().host.mute) try errify(c.SDL_ResumeAudioStreamDevice(self.audio.stream));
self.state.emulation = .Active;
},
.Inactive => {
// Assert that double pausing is impossible
// try errify(c.SDL_ResumeAudioDevice(c.SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK));
if (!config.config().host.mute) try errify(c.SDL_PauseAudioStreamDevice(self.audio.stream));
sync.paused.store(true, .monotonic);
self.state.emulation = .Inactive;
@@ -233,7 +235,7 @@ pub const Gui = struct {
// spurious calls to SDL_LockAudioDevice?
try errify(c.SDL_LockAudioStream(self.audio.stream));
defer errify(c.SDL_UnlockAudioStream(self.audio.stream)) catch @panic("TODO: FIXME");
defer errify(c.SDL_UnlockAudioStream(self.audio.stream)) catch std.debug.panic("SDL Error: {s}", .{c.SDL_GetError()});
zgui_redraw = imgui.draw(&self.state, sync, win_dim, cpu, out_tex[0]);
},
@@ -257,17 +259,17 @@ pub const Gui = struct {
}
};
const Audio = struct {
const Self = @This();
const log = std.log.scoped(.PlatformAudio);
pub const Audio = struct {
const log = std.log.scoped(.platform_audio);
stream: *c.SDL_AudioStream,
fn init(apu: *Apu) !Self {
var desired: c.SDL_AudioSpec = std.mem.zeroes(c.SDL_AudioSpec);
desired.freq = sample_rate;
desired.format = c.SDL_AUDIO_S16LE;
desired.channels = 2;
fn init(apu: *Apu) !@This() {
const desired: c.SDL_AudioSpec = .{
.freq = sample_rate,
.format = c.SDL_AUDIO_S16LE,
.channels = 2,
};
log.info("Host Sample Rate: {}Hz, Host Format: SDL_AUDIO_S16LE", .{sample_rate});
@@ -278,7 +280,7 @@ const Audio = struct {
return .{ .stream = stream };
}
fn deinit(self: *Self) void {
fn deinit(self: *@This()) void {
c.SDL_DestroyAudioStream(self.stream);
self.* = undefined;
}