On 7/12/2025 9:32 PM, Michael Niedermayer wrote:
> On Fri, Jul 11, 2025 at 04:04:17PM +0000, Timo Rothenpieler wrote:
>> ffmpeg | branch: master | Timo Rothenpieler <timo@rothenpieler.org> | Tue Jun 24 19:30:19 2025 +0200| [90fa9636efff84ec5a4b06815722c08188dca551] | committer: Timo Rothenpieler
>>
>> avformat/tls_schannel: add DTLS support
>>
>>> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=90fa9636efff84ec5a4b06815722c08188dca551
>> ---
>>
>>   configure                  |   6 +-
>>   libavformat/tls_schannel.c | 890 +++++++++++++++++++++++++++++++++++++++++----
>>   libavformat/version.h      |   2 +-
>>   3 files changed, 833 insertions(+), 65 deletions(-)
> 
> breaks on mingw64
> 
> src/libavformat/tls_schannel.c: In function ‘ff_dtls_export_materials’:
> src/libavformat/tls_schannel.c:606:5: error: unknown type name ‘SecPkgContext_KeyingMaterialInfo’; did you mean ‘SecPkgContext_NegotiationInfo’?

This type (and probably everything below) is API introduced on Windows 
10, so unless you build targeting _WIN32_WINNT >= 0x0A00, it will not be 
defined.
So i guess we should make the tls_schannel.c force that value, like so:

> diff --git a/libavformat/tls_openssl.c b/libavformat/tls_openssl.c
> index 2a01fb387d..a5cc8d3e27 100644
> --- a/libavformat/tls_openssl.c
> +++ b/libavformat/tls_openssl.c
> @@ -20,6 +20,11 @@
>   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
>   */
>  
> +#if !defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0A00
> +#undef _WIN32_WINNT
> +#define _WIN32_WINNT 0x0A00
> +#endif
> +
>  #include "libavutil/mem.h"
>  #include "network.h"
>  #include "os_support.h"