From c4888bea71326f7a69e8214af0d9c2a62a60b887 Mon Sep 17 00:00:00 2001 From: skal Date: Wed, 4 Feb 2026 13:08:13 +0100 Subject: feat(audio): Implement audio backend abstraction (Task #51.1) Created interface-based audio backend system to enable testing without hardware. This is the foundation for robust tracker timing verification. Changes: - Created AudioBackend interface with init/start/shutdown methods - Added test-only hooks: on_voice_triggered() and on_frames_rendered() - Moved miniaudio implementation to MiniaudioBackend class - Refactored audio.cc to use backend abstraction with auto-fallback - Added time tracking to synth.cc (elapsed time from rendered frames) - Created test_audio_backend.cc to verify backend injection works - Fixed audio test linking to include util/procedural dependencies All test infrastructure guarded by #if !defined(STRIP_ALL) for zero size impact on final build. Production path unchanged, 100% backward compatible. All 13 tests pass. handoff(Claude): Task #51.1 complete, audio backend abstraction ready Co-Authored-By: Claude Sonnet 4.5 --- src/audio/miniaudio_backend.h | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) create mode 100644 src/audio/miniaudio_backend.h (limited to 'src/audio/miniaudio_backend.h') diff --git a/src/audio/miniaudio_backend.h b/src/audio/miniaudio_backend.h new file mode 100644 index 0000000..d46a0c5 --- /dev/null +++ b/src/audio/miniaudio_backend.h @@ -0,0 +1,31 @@ +// This file is part of the 64k demo project. +// It implements the production audio backend using miniaudio. +// This is the default backend for the final build. + +#pragma once + +#include "audio_backend.h" +#include "miniaudio.h" + +// Production audio backend using miniaudio library +// Manages real hardware audio device and playback +class MiniaudioBackend : public AudioBackend { + public: + MiniaudioBackend(); + ~MiniaudioBackend() override; + + void init() override; + void start() override; + void shutdown() override; + + // Get the underlying miniaudio device (for internal use) + ma_device* get_device() { return &device_; } + + private: + ma_device device_; + bool initialized_; + + // Static callback required by miniaudio C API + static void audio_callback(ma_device* pDevice, void* pOutput, + const void* pInput, ma_uint32 frameCount); +}; -- cgit v1.2.3