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host: cross-platform audio decode (Android has sound)

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Replace the macOS-only AudioToolbox decoder with mt_host::decode_audio: a
RIFF/WAVE PCM parser plus vendored dr_mp3, resampled/remixed to 44.1 kHz
stereo float with SDL_ConvertAudioSamples. macOS and Android now share one
path; the AudioToolbox link is gone.

BGM is no longer cached in clips_ (a 5-minute track is ~100 MB of float):
only the playing track is kept, and a new one decodes on a worker thread
(the pack read stays on the main thread) so map changes do not stall.

host.audio_decode test: synthetic wav layouts + all 1578 pack .wav, 9 pack
.mp3 and 25 Client/BGM .mp3 decode (7060 s of audio in ~3.6 s on M2).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
shenlei
2026-09-29 21:22:11 +09:00
co-authored by Claude Opus 5.5
parent 75d2dd8545
commit eab5938072
11 changed files with 5889 additions and 107 deletions
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src/host/README.md
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@@ -54,7 +54,7 @@ vendored `stb_image.h` is upstream v2.30 (SHA-256
### Interactive Playable Modes
Run the full 40250 client interactively (infinite frame loop until window close, resizable SDL3 window with automatic Vulkan swapchain recreation and `PythonBoot::SetUISize` sync, full keyboard/IME text input, SDL hardware cursor built from the original cursor images, and SDL3 + `AudioToolbox` `.wav`/`.mp3` audio):
Run the full 40250 client interactively (infinite frame loop until window close, resizable SDL3 window with automatic Vulkan swapchain recreation and `PythonBoot::SetUISize` sync, full keyboard/IME text input, SDL hardware cursor built from the original cursor images, and SDL3 `.wav`/`.mp3` audio via `audio_decode.cpp` + dr_mp3, the same on every platform):
```sh
# Interactive outdoor map session (auto-login via loopback FakeLoginServer)