video: move struct mp_hwdec_info into its own header file

This means most code accessing this struct must now include hwdec.h
instead of dec_video.h. I just put it into dec_video.h at first because
I thought a separate file would be a waste, but it's more proper to do
it this way, as there are too many files which include dec_video.h only
to get the mp_hwdec_info definition.

mpvcore/player/video.c

@@ -35,6 +35,7 @@
 #include "demux/demux.h"
 #include "stream/stream.h"
 #include "sub/sub.h"
+#include "video/hwdec.h"
 #include "video/filter/vf.h"
 #include "video/decode/dec_video.h"
 #include "video/out/vo.h"

video/decode/dec_video.h

@@ -42,18 +42,4 @@ void video_reinit_vo(struct sh_video *sh_video);
 int get_current_video_decoder_lag(sh_video_t *sh_video);
 int vd_control(struct sh_video *sh_video, int cmd, void *arg);
 
-// Used to communicate hardware decoder API handles from VO to video decoder.
-// The VO can set the context pointer for supported APIs.
-struct mp_hwdec_info {
-    struct mp_vdpau_ctx *vdpau_ctx;
-    struct mp_vaapi_ctx *vaapi_ctx;
-    // Can be used to lazily load a requested API.
-    // api_name is e.g. "vdpau" (like the fields above, without "_ctx")
-    // Can be NULL, is idempotent, caller checks _ctx fields for success/access.
-    void (*load_api)(struct mp_hwdec_info *info, const char *api_name);
-    void *load_api_ctx;
-};
-
-void hwdec_request_api(struct mp_hwdec_info *info, const char *api_name);
-
 #endif /* MPLAYER_DEC_VIDEO_H */

video/decode/lavc.h

@@ -9,6 +9,7 @@
 
 #include "demux/stheader.h"
 #include "video/mp_image.h"
+#include "video/hwdec.h"
 
 // keep in sync with --hwdec option
 enum hwdec_type {

video/decode/vaapi.c

@@ -33,7 +33,7 @@
 #include "video/fmt-conversion.h"
 #include "video/vaapi.h"
 #include "video/mp_image_pool.h"
-#include "video/decode/dec_video.h"
+#include "video/hwdec.h"
 #include "video/filter/vf.h"
 
 /*

video/decode/vdpau.c

@@ -27,7 +27,7 @@
 #include "mpvcore/av_common.h"
 #include "video/fmt-conversion.h"
 #include "video/vdpau.h"
-#include "video/decode/dec_video.h"
+#include "video/hwdec.h"
 
 struct priv {
     struct mp_vdpau_ctx        *mpvdp;

video/decode/vdpau_old.c

@@ -30,7 +30,7 @@
 #include "lavc.h"
 #include "video/fmt-conversion.h"
 #include "video/vdpau.h"
-#include "video/decode/dec_video.h"
+#include "video/hwdec.h"
 
 struct priv {
     struct mp_vdpau_ctx        *mpvdp;

video/filter/vf_vavpp.c

@@ -22,7 +22,7 @@
 #include "mpvcore/options.h"
 #include "vf.h"
 #include "video/vaapi.h"
-#include "video/decode/dec_video.h"
+#include "video/hwdec.h"
 
 static inline bool is_success(VAStatus status, const char *msg)
 {

video/hwdec.h

@@ -0,0 +1,20 @@
+#ifndef MP_HWDEC_H_
+#define MP_HWDEC_H_
+
+// Used to communicate hardware decoder API handles from VO to video decoder.
+// The VO can set the context pointer for supported APIs.
+struct mp_hwdec_info {
+    struct mp_vdpau_ctx *vdpau_ctx;
+    struct mp_vaapi_ctx *vaapi_ctx;
+    // Can be used to lazily load a requested API.
+    // api_name is e.g. "vdpau" (like the fields above, without "_ctx")
+    // Can be NULL, is idempotent, caller checks _ctx fields for success/access.
+    void (*load_api)(struct mp_hwdec_info *info, const char *api_name);
+    void *load_api_ctx;
+};
+
+// Trivial helper to call info->load_api().
+// Implemented in vd_lavc.c.
+void hwdec_request_api(struct mp_hwdec_info *info, const char *api_name);
+
+#endif

video/out/gl_hwdec_vaglx.c

@@ -26,7 +26,7 @@
 #include "x11_common.h"
 #include "gl_common.h"
 #include "video/vaapi.h"
-#include "video/decode/dec_video.h"
+#include "video/hwdec.h"
 
 struct priv {
     struct mp_vaapi_ctx *ctx;

video/out/gl_hwdec_vdpau.c

@@ -22,7 +22,7 @@
 
 #include "gl_common.h"
 #include "video/vdpau.h"
-#include "video/decode/dec_video.h"
+#include "video/hwdec.h"
 
 // This is a GL_NV_vdpau_interop specification bug, and headers (unfortunately)
 // follow it. I'm not sure about the original nvidia headers.

video/out/vo_opengl.c

@@ -48,7 +48,7 @@
 #include "gl_osd.h"
 #include "filter_kernels.h"
 #include "video/memcpy_pic.h"
-#include "video/decode/dec_video.h"
+#include "video/hwdec.h"
 #include "gl_video.h"
 #include "gl_lcms.h"
 

video/out/vo_vaapi.c

@@ -39,7 +39,7 @@
 #include "video/vfcap.h"
 #include "video/mp_image.h"
 #include "video/vaapi.h"
-#include "video/decode/dec_video.h"
+#include "video/hwdec.h"
 
 struct vaapi_osd_image {
     int            w, h;

video/out/vo_vdpau.c

@@ -36,7 +36,7 @@
 
 #include "config.h"
 #include "video/vdpau.h"
-#include "video/decode/dec_video.h"
+#include "video/hwdec.h"
 #include "mpvcore/mp_msg.h"
 #include "mpvcore/options.h"
 #include "talloc.h"