build: check whether hwaccels are enabled in FFmpeg

FFmpeg can be compiled with them disabled, and then it won't provide the
public headers specific to these APIs, causing mpv compilation failure.

1 files changed, 5 insertions, 3 deletions

diff --git a/wscript b/wscript
index 0ec9888790..fd37e4bbe7 100644
--- a/wscript
+++ b/wscript
@@ -665,7 +665,7 @@ hwaccel_features = [
         'name': '--vaapi-hwaccel',
         'desc': 'libavcodec VAAPI hwaccel',
         'deps': [ 'vaapi' ],
-        'func': check_true,
+        'func': check_statement('libavcodec/vaapi.h', '', use='libav'),
     } , {
         'name': '--vda-hwaccel',
         'desc': 'libavcodec VDA hwaccel',
@@ -684,12 +684,14 @@ hwaccel_features = [
         'name': '--vdpau-hwaccel',
         'desc': 'libavcodec VDPAU hwaccel',
         'deps': [ 'vdpau' ],
-        'func': check_true,
+        'func': check_statement('libavcodec/vdpau.h',
+                                'av_vdpau_alloc_context()',
+                                use='libav'),
     }, {
         'name': '--dxva2-hwaccel',
         'desc': 'libavcodec DXVA2 hwaccel',
         'deps': [ 'gdi' ],
-        'func': check_true,
+        'func': check_statement('libavcodec/dxva2.h', '', use='libav'),
     }
 ]