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fix: remove DC offset from audio output

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This commit is contained in:
Rekai Nyangadzayi Musuka
2022-05-26 17:10:10 -03:00
parent 697ec46cf1
commit c007bf4d8e
2 changed files with 9 additions and 3 deletions
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5
src/apu.zig
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@@ -200,7 +200,10 @@ pub const Apu = struct {
self.stream = SDL.SDL_NewAudioStream(SDL.AUDIO_U16, 2, @intCast(c_int, self.sampleRate()), SDL.AUDIO_U16, 2, host_sample_rate) orelse unreachable;
}
_ = SDL.SDL_AudioStreamPut(self.stream, &[2]u16{ final_left, final_right }, 2 * @sizeOf(u16));
// If we add 0x4040 to each sample the DC Offset is removed
// note: found this through guess and check
// FIXME: Pretty sure this is a dirty hack and should be fixed
_ = SDL.SDL_AudioStreamPut(self.stream, &[2]u16{ final_left + 0x4040, final_right + 0x4040 }, 2 * @sizeOf(u16));
self.sched.push(.SampleAudio, self.sampleTicks() -| late);
}