Add multi-backend capture with automatic fallback chain

.github/workflows/ci.yml

@@ -32,7 +32,8 @@ jobs:
             libgtk-3-dev \
             libavahi-client-dev \
             libqrencode-dev \
-            libpng-dev
+            libpng-dev \
+            libx11-dev
 
       - name: Build (${{ matrix.build-type }})
         run: |
@@ -77,7 +78,8 @@ jobs:
             libgtk-3-dev \
             libavahi-client-dev \
             libqrencode-dev \
-            libpng-dev
+            libpng-dev \
+            libx11-dev
 
       - name: Build tests
         run: make test-build
@@ -112,6 +114,7 @@ jobs:
             libavahi-client-dev \
             libqrencode-dev \
             libpng-dev \
+            libx11-dev \
             xvfb
 
       - name: Build
@@ -179,6 +182,7 @@ jobs:
             libavahi-client-dev \
             libqrencode-dev \
             libpng-dev \
+            libx11-dev \
             valgrind
 
       - name: Build with debug symbols
@@ -282,7 +286,8 @@ jobs:
             libgtk-3-dev \
             libavahi-client-dev \
             libqrencode-dev \
-            libpng-dev
+            libpng-dev \
+            libx11-dev
 
       - name: Configure CMake
         run: cmake -B build -S . -DCMAKE_BUILD_TYPE=Release

.gitignore

@@ -9,3 +9,5 @@ build/
 *.pdb
 rootstream
 tools/rstr-player
+_codeql_build_dir/
+_codeql_detected_source_root

CMakeLists.txt

@@ -78,6 +78,7 @@ if(UNIX AND NOT APPLE)
     pkg_check_modules(AVAHI avahi-client)
     pkg_check_modules(QRENCODE libqrencode)
     pkg_check_modules(PNG libpng)
+    pkg_check_modules(X11 x11)
 
     if(VAAPI_FOUND)
         add_compile_definitions(HAVE_VAAPI)
@@ -86,6 +87,10 @@ if(UNIX AND NOT APPLE)
     if(AVAHI_FOUND)
         add_compile_definitions(HAVE_AVAHI)
     endif()
+
+    if(X11_FOUND)
+        add_compile_definitions(HAVE_X11)
+    endif()
 endif()
 
 if(WIN32)
@@ -128,6 +133,8 @@ set(COMMON_SOURCES
 
 set(LINUX_SOURCES
     src/drm_capture.c
+    src/x11_capture.c
+    src/dummy_capture.c
     src/vaapi_encoder.c
     src/nvenc_encoder.c
     src/vaapi_decoder.c
@@ -218,6 +225,11 @@ if(UNIX AND NOT APPLE)
         target_include_directories(rootstream PRIVATE ${AVAHI_INCLUDE_DIRS})
     endif()
 
+    if(X11_FOUND)
+        target_link_libraries(rootstream PRIVATE ${X11_LIBRARIES})
+        target_include_directories(rootstream PRIVATE ${X11_INCLUDE_DIRS})
+    endif()
+
     if(QRENCODE_FOUND)
         target_link_libraries(rootstream PRIVATE ${QRENCODE_LIBRARIES})
         target_include_directories(rootstream PRIVATE ${QRENCODE_INCLUDE_DIRS})

Makefile

@@ -89,6 +89,16 @@ else
     $(warning ALSA not found - audio will not work. Install libasound2-dev or alsa-lib-devel)
 endif
 
+# X11 (optional, for X11 capture fallback)
+X11_FOUND := $(shell pkg-config --exists x11 && echo yes)
+ifeq ($(X11_FOUND),yes)
+    CFLAGS += $(shell pkg-config --cflags x11)
+    LIBS += $(shell pkg-config --libs x11)
+    CFLAGS += -DHAVE_X11
+else
+    $(info X11 not found - X11 capture backend will be disabled)
+endif
+
 # NVENC (optional, for NVIDIA GPU encoding)
 # Check both CUDA and NVENC SDK headers
 CUDA_FOUND := $(shell pkg-config --exists cuda && echo yes)
@@ -131,7 +141,10 @@ PLAYER := tools/rstr-player
 
 # Source files
 SRCS := src/main.c \
+        src/core.c \
         src/drm_capture.c \
+        src/x11_capture.c \
+        src/dummy_capture.c \
         src/vaapi_encoder.c \
         src/vaapi_decoder.c \
         src/nvenc_encoder.c \
@@ -149,7 +162,8 @@ SRCS := src/main.c \
         src/config.c \
         src/latency.c \
         src/recording.c \
-        src/platform/platform_linux.c
+        src/platform/platform_linux.c \
+        src/packet_validate.c
 
 ifdef HEADLESS
     SRCS := $(filter-out src/tray.c,$(SRCS))
@@ -215,7 +229,7 @@ $(TARGET): $(OBJS)
 
 # Build rstr-player tool
 # Note: Needs many modules for dependencies - simplified player would be better long-term
-$(PLAYER): tools/rstr-player.c src/recording.c src/vaapi_decoder.c src/display_sdl2.c src/network.c src/crypto.c src/config.c src/input.c src/opus_codec.c src/audio_playback.c src/latency.c src/platform/platform_linux.c
+$(PLAYER): tools/rstr-player.c src/recording.c src/vaapi_decoder.c src/display_sdl2.c src/network.c src/crypto.c src/config.c src/input.c src/opus_codec.c src/audio_playback.c src/latency.c src/platform/platform_linux.c src/packet_validate.c
 	@echo "🔗 Building rstr-player..."
 	@$(CC) $(CFLAGS) $^ -o $(PLAYER) $(LDFLAGS) $(LIBS)
 	@echo "✓ Build complete: $(PLAYER)"