cmake: cleanup ffmpeg detection

modules/videoio/src/cap_ffmpeg_impl.hpp

@@ -75,48 +75,8 @@ extern "C" {
 #include <libavutil/imgutils.h>
 #endif
 
-#ifdef WIN32
-  #define HAVE_FFMPEG_SWSCALE 1
-  #include <libavcodec/avcodec.h>
-  #include <libswscale/swscale.h>
-#else
-
-#ifndef HAVE_FFMPEG_SWSCALE
-    #error "libswscale is necessary to build the newer OpenCV ffmpeg wrapper"
-#endif
-
-// if the header path is not specified explicitly, let's deduce it
-#if !defined HAVE_FFMPEG_AVCODEC_H && !defined HAVE_LIBAVCODEC_AVCODEC_H
-
-#if defined(HAVE_GENTOO_FFMPEG)
-  #define HAVE_LIBAVCODEC_AVCODEC_H 1
-  #if defined(HAVE_FFMPEG_SWSCALE)
-    #define HAVE_LIBSWSCALE_SWSCALE_H 1
-  #endif
-#elif defined HAVE_FFMPEG
-  #define HAVE_FFMPEG_AVCODEC_H 1
-  #if defined(HAVE_FFMPEG_SWSCALE)
-    #define HAVE_FFMPEG_SWSCALE_H 1
-  #endif
-#endif
-
-#endif
-
-#if defined(HAVE_FFMPEG_AVCODEC_H)
-  #include <ffmpeg/avcodec.h>
-#endif
-#if defined(HAVE_FFMPEG_SWSCALE_H)
-  #include <ffmpeg/swscale.h>
-#endif
-
-#if defined(HAVE_LIBAVCODEC_AVCODEC_H)
-  #include <libavcodec/avcodec.h>
-#endif
-#if defined(HAVE_LIBSWSCALE_SWSCALE_H)
-  #include <libswscale/swscale.h>
-#endif
-
-#endif
+#include <libavcodec/avcodec.h>
+#include <libswscale/swscale.h>
 
 #ifdef __cplusplus
 }

modules/videoio/src/ffmpeg_codecs.hpp

@@ -60,24 +60,7 @@ extern "C" {
 #include <errno.h>
 #endif
 
-// if the header path is not specified explicitly, let's deduce it
-#if !defined HAVE_FFMPEG_AVCODEC_H && !defined HAVE_LIBAVCODEC_AVCODEC_H
-
-#if defined(HAVE_GENTOO_FFMPEG)
-  #define HAVE_LIBAVFORMAT_AVFORMAT_H 1
-#elif defined HAVE_FFMPEG
-  #define HAVE_FFMPEG_AVFORMAT_H 1
-#endif
-
-#if defined(HAVE_FFMPEG_AVFORMAT_H)
-  #include <ffmpeg/avformat.h>
-#endif
-
-#if defined(HAVE_LIBAVFORMAT_AVFORMAT_H) || defined(WIN32)
-  #include <libavformat/avformat.h>
-#endif
-
-#endif
+#include <libavformat/avformat.h>
 
 #ifdef __cplusplus
 }