FFmpeg core: no hang on video gaps, decoder detection, more formats

.github/workflows/Linux-samples-cores.yml

@@ -165,15 +165,16 @@ jobs:
           # empty or absent, then teardown while the decode thread is
           # still working.
           #
-          # Leak detection off: libavutil's HW-device probing keeps a
-          # few objects, as the audio-pipe lane already has it. The
-          # libav* TSan suppressions are the same ones and for the
-          # same reason.
+          # With leak detection: every load and unload in it, the
+          # decoder probing included, must give back its codec
+          # contexts and hardware devices. The libav* TSan
+          # suppressions are the audio-pipe lane's, for the same
+          # reason.
           make clean all
           ./ffmpeg_sweep_test
           echo "[pass] ffmpeg_sweep_test"
           make clean all SANITIZER=address,undefined
-          ASAN_OPTIONS=detect_leaks=0:detect_stack_use_after_return=1 \
+          ASAN_OPTIONS=detect_leaks=1:detect_stack_use_after_return=1 \
              UBSAN_OPTIONS=print_stacktrace=1 timeout 900 ./ffmpeg_sweep_test
           echo "[pass] ffmpeg_sweep_test (ASan)"
           make clean all SANITIZER=thread

cores/internal_cores.h

@@ -91,6 +91,10 @@ unsigned libretro_ffmpeg_retro_api_version(void);
 
 void libretro_ffmpeg_retro_get_system_info(struct retro_system_info *info);
 
+/* True if this build's FFmpeg can open files with this (lowercase)
+ * extension; extensions the core always claimed are always true. */
+bool libretro_ffmpeg_ffmpeg_core_supports_extension(const char *ext);
+
 void libretro_ffmpeg_retro_get_system_av_info(struct retro_system_av_info *info);
 
 void libretro_ffmpeg_retro_set_environment(retro_environment_t cb);