Prevent HEVC streaming with the software decoder for performance reasons

app/streaming/video/ffmpeg-renderers/sdl.cpp

@@ -1,5 +1,7 @@
 #include "renderer.h"
 
+#include <Limelight.h>
+
 SdlRenderer::SdlRenderer()
     : m_Renderer(nullptr),
       m_Texture(nullptr)
@@ -25,10 +27,18 @@ bool SdlRenderer::prepareDecoderContext(AVCodecContext*)
 }
 
 bool SdlRenderer::initialize(SDL_Window* window,
-                             int,
+                             int videoFormat,
                              int width,
                              int height)
 {
+    // NOTE: HEVC currently uses only 1 slice regardless of what
+    // we provide in CAPABILITY_SLICES_PER_FRAME(), so we should
+    // never use it for software decoding (unless common-c starts
+    // respecting it for HEVC).
+    if (videoFormat != VIDEO_FORMAT_H264) {
+        return false;
+    }
+
     m_Renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
     if (!m_Renderer) {
         SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,