VideoOutputStrategy.hpp File Reference

Vendor-neutral interface for GPU-direct video OUTPUT strategies. More...

Detailed Description

Vendor-neutral interface for GPU-direct video OUTPUT strategies.

Any peer device that can "give me a GPU pointer I can DMA from" (capture cards via a vendor pin/register call, plus NVIDIA DVP and SMPTE 2110 variants) can hang strategies off the same dispatch chain inside its addon.

Concrete implementations live in each vendor's addon; only the interface and the supporting helpers (ImportedGpuBufferRing, InteropFence, ComputeRingDispatcher, RdmaVideoOutput) live here, so a per-vendor file shrinks to ~50 lines: construct a RdmaVideoOutput, fill in the pin/unpin callbacks.

Lifecycle:

1. Vendor addon picks a strategy based on backend + feature availability + vendor-specific format constraints; constructs it with the vendor-specific bits (card handle, format enum, channel, ...) as constructor args.
2. Addon calls init(VideoOutputStrategyConfig{rhi, state, sourceTex, w, h, frameByteSize}). On failure (no CUDA, format unsupported, vendor refused to pin), strategy releases its partial state and returns false; addon falls back to the next strategy (or CPU staging).
3. Per frame:
   • encodeFrame(cb) inside the offscreen frame.
   • prepareNextFrame() after endOffscreenFrame returns the GPU pointer to feed the vendor submission API (AutoCirculateTransfer.SetVideoBuffer, MWCaptureVideoFrameToPhysicalAddress, rmx_output_*_send_chunk, ...).
4. release() at shutdown.

Go to the source code of this file.

Classes
struct	score::gfx::interop::VideoOutputStrategyConfig
	Generic config passed to VideoOutputStrategy::init. Vendor- specific bits (card handle, pixel-format enum, ...) live on the strategy class itself. More...
struct	score::gfx::interop::VideoOutputStrategy
	Per-graphics-API strategy interface for vendor GPU-direct output. Each addon implements one impl per (graphics API, vendor interop family) tuple. More...

Namespaces
namespace	score
	Base toolkit upon which the software is built.
namespace	score::gfx
	Graphics rendering pipeline for ossia score.