From 984e42b0bc7f3c02d7ea257a0f7f409a27b1b8b3 Mon Sep 17 00:00:00 2001
From: Biswapriyo Nath <nathbappai@gmail.com>
Date: Fri, 19 Aug 2022 13:14:57 +0530
Subject: [PATCH] videoio: Include missing locale header for
 std::wstring_convert

This fixes the following error with mingw toolchain:
opencv/modules/videoio/src/cap_msmf.cpp:1020: error: 'wstring_convert' is not a member of 'std'
 1020 |                                     std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> conv;
      |                                          ^~~~~~~~~~~~~~~
opencv/modules/videoio/src/cap_ffmpeg_hw.hpp:230:26: error: 'wstring_convert' is not a member of 'std'
  230 |                     std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> conv;
      |                          ^~~~~~~~~~~~~~~

The locale header is required according to C++ standard.
See https://en.cppreference.com/w/cpp/locale/wstring_convert
---
 modules/videoio/src/cap_ffmpeg_hw.hpp | 1 +
 modules/videoio/src/cap_msmf.cpp      | 1 +
 2 files changed, 2 insertions(+)

diff --git a/modules/videoio/src/cap_ffmpeg_hw.hpp b/modules/videoio/src/cap_ffmpeg_hw.hpp
index 31db5fdd5d..0998ee9f48 100644
--- a/modules/videoio/src/cap_ffmpeg_hw.hpp
+++ b/modules/videoio/src/cap_ffmpeg_hw.hpp
@@ -21,6 +21,7 @@
 #define D3D11_NO_HELPERS
 #include <d3d11.h>
 #include <codecvt>
+#include <locale>
 #include "opencv2/core/directx.hpp"
 #ifdef HAVE_OPENCL
 #include <CL/cl_d3d11.h>
diff --git a/modules/videoio/src/cap_msmf.cpp b/modules/videoio/src/cap_msmf.cpp
index d3002a5151..f28c0bbdb3 100644
--- a/modules/videoio/src/cap_msmf.cpp
+++ b/modules/videoio/src/cap_msmf.cpp
@@ -29,6 +29,7 @@
 #ifdef HAVE_MSMF_DXVA
 #include <d3d11.h>
 #include <d3d11_4.h>
+#include <locale>
 #endif
 #include <new>
 #include <map>