Codex
b35eb19c13
Keep the original multichannel batch available to recording when playback uses the stereo fallback, without retaining it after the callback. Admit native AC-3 speaker masks up to six channels while preserving their positions. Use the configured float hint before a device context exists, even if the audio active flag is already set. Add channel-identity and startup-format regressions plus native signed-PCM and negotiated-float acceptance.
D3D12 recording dispatcher
A dedicated I/O worker constructs, services and retires the recording session.
The cold controller copies configuration and the UTF-8 output path at creation.
The render and PCM producers return BUSY during startup, consuming nothing.
Once ready they preserve capture and whole-PCM-batch backpressure. The desktop Windows NVENC frontend attaches GPU capture and optional multichannel
core audio; see ../nvenc_frontend/README.md.
Both producers close from their own threads after their last push returns, including startup failure and cancellation. Disabled audio starts closed. Cancellation requests drain and stops admission; it does not close producers on their behalf. Collection checks thread completion without joining or waiting. The borrowed constructor refuses active resources; retain capture until dispatch collection and its GPU retirement succeed. Capture owns submitted source/fence references; its render owner reaps completed sources before a swapchain resize. A persistent SDK or owned-handle failure may retain resources for safety.
The worker registers before rechecking for work, then waits for producer notifications or a borrowed encoder/file completion handle. An idle worker has no periodic timer. SDK BUSY without completion, or BUSY with an already signaled completion, schedules a short retry on the I/O worker. Producers notify with an atomic operation and signal the event only while parked. There are no added waits, locks or allocation on frame/audio entry points.
make check exercises the production dispatcher through deterministic park
races, startup/cancellation boundaries, concurrent producers, completion
waits and SDK retries. Windows uses native kernel events and threads. Linux
uses a test-only pthread Win32 scheduling shim to run that same production
code under ASan/UBSan and TSan; shim locks model the kernel waits only.
The separate threadless executable checks the unavailable backend.
The composed fixture uses the real session, GPU packet pump, queue, AC-3 and MP4 mux, with simulated capture/encoder and file operations. It checks normal completion, cancellation, partial startup failure and file failure, including lease retirement. These tests do not establish native GPU acceptance.
The owned constructor transfers a fresh capture only on successful construction. Its worker destroys the session, then retries capture destruction until GPU copies and source references retire. DONE/FAILED therefore also cover capture retirement. Neither producer may access the transferred capture directly; the render producer uses video_reap before closure when preparing a resize. Both producers must finish their last API calls before closing, including on startup failure and cancellation. Failed construction leaves capture ownership with the caller. Delayed GPU retirement is retried only on the I/O worker.
Owned-lifetime fixtures hold simulated GPU completion after session destruction, refuse controller collection, and verify exactly one capture destruction after completion. They also cover startup/cancellation, disabled audio, producer-close ordering, construction failures and closed-producer reap refusal. The composed session/AC-3/MP4 fixture exercises both ownership modes.