fegger
30538fba73
Two quality improvements: Preset: ultrafast -> veryfast. Unlocks Main profile with CABAC entropy coding, hexagonal motion search, 3 reference frames, and adaptive quantization — typically 30-40% better quality at the same bitrate. The desktop handles the extra encoding cost trivially (150+ fps at 1080p). Downscaling: the receiver now advertises its display resolution in the signaling answer (display_width/display_height, 0 = unknown). When the capture exceeds the display (e.g. 2256x1504 source on a 1920x1080 receiver), the sender scales down preserving aspect ratio before encoding — the same sws_scale pass that already converts the pixel format also handles the resolution change, so there is no extra step. This concentrates the entire bitrate into pixels the display actually shows (~2.7x more bits per visible pixel at 4000 kbps when going from 2256x1504 to 1620x1080). The renderer caches the display size during window creation (native monitor resolution in fullscreen/KMSDRM; window size otherwise). The receiver includes it in every signaling answer; the sender pipeline computes aspect-preserving, even-rounded scaled dimensions when the display is smaller than the capture. meson test 5/5 in both configurations, valgrind clean.
45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
#pragma once
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#include "screencast/codec/decoder.h"
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#include "screencast/render/error.h"
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#include <memory>
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#include <string>
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namespace sc {
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struct RendererConfig {
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std::string window_title = "screencast receiver";
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int initial_width = 1280;
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int initial_height = 720;
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// Borderless fullscreen. On the headless KMSDRM backend (no window
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// manager) fullscreen is enabled automatically.
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bool fullscreen = false;
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};
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class Renderer {
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public:
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virtual ~Renderer() = default;
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// Present one decoded frame. Returns false if the window was closed.
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virtual bool present(const DecodedFrame& frame) = 0;
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// The display resolution (native monitor size in fullscreen mode).
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// Used by the receiver to tell the sender what resolution to encode at.
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virtual int display_width() const = 0;
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virtual int display_height() const = 0;
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// Pump events (window close, resize). Non-blocking.
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virtual bool poll_events() = 0;
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// Destroy the window and release GPU resources.
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virtual void shutdown() = 0;
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};
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class RendererFactory {
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public:
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static RendererResult<std::unique_ptr<Renderer>> create(const RendererConfig& config);
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};
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} // namespace sc
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