vdpau: switch ff_vdpau_get_surface_id from Picture to AVFrame

This gets rid of aliasing completely unrelated structs to Picture.

Fixes the remaining compilation warnings in the vdpau code.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavcodec/vdpau.c

@@ -57,7 +57,7 @@ int ff_vdpau_mpeg_end_frame(AVCodecContext *avctx)
     MpegEncContext *s = avctx->priv_data;
     Picture *pic = s->current_picture_ptr;
     struct vdpau_picture_context *pic_ctx = pic->hwaccel_picture_private;
-    VdpVideoSurface surf = ff_vdpau_get_surface_id(pic);
+    VdpVideoSurface surf = ff_vdpau_get_surface_id(&pic->f);
 
     hwctx->render(hwctx->decoder, surf, (void *)&pic_ctx->info,
                   pic_ctx->bitstream_buffers_used, pic_ctx->bitstream_buffers);

libavcodec/vdpau_h264.c

@@ -50,7 +50,7 @@ static void vdpau_h264_clear_rf(VdpReferenceFrameH264 *rf)
 static void vdpau_h264_set_rf(VdpReferenceFrameH264 *rf, H264Picture *pic,
                               int pic_structure)
 {
-    VdpVideoSurface surface = ff_vdpau_get_surface_id(pic);
+    VdpVideoSurface surface = ff_vdpau_get_surface_id(&pic->f);
 
     if (pic_structure == 0)
         pic_structure = pic->reference;
@@ -87,7 +87,7 @@ static void vdpau_h264_set_reference_frames(AVCodecContext *avctx)
             if (!pic || !pic->reference)
                 continue;
             pic_frame_idx = pic->long_ref ? pic->pic_id : pic->frame_num;
-            surface_ref = ff_vdpau_get_surface_id(pic);
+            surface_ref = ff_vdpau_get_surface_id(&pic->f);
 
             rf2 = &info->referenceFrames[0];
             while (rf2 != rf) {
@@ -193,7 +193,7 @@ static int vdpau_h264_end_frame(AVCodecContext *avctx)
     H264Context *h = avctx->priv_data;
     H264Picture *pic = h->cur_pic_ptr;
     struct vdpau_picture_context *pic_ctx = pic->hwaccel_picture_private;
-    VdpVideoSurface surf = ff_vdpau_get_surface_id(pic);
+    VdpVideoSurface surf = ff_vdpau_get_surface_id(&pic->f);
 
     hwctx->render(hwctx->decoder, surf, (void *)&pic_ctx->info,
                   pic_ctx->bitstream_buffers_used, pic_ctx->bitstream_buffers);

libavcodec/vdpau_internal.h

@@ -31,10 +31,10 @@
 #include "mpegvideo.h"
 #include "version.h"
 
-/** Extract VdpVideoSurface from a Picture */
-static inline uintptr_t ff_vdpau_get_surface_id(Picture *pic)
+/** Extract VdpVideoSurface from an AVFrame */
+static inline uintptr_t ff_vdpau_get_surface_id(AVFrame *pic)
 {
-    return (uintptr_t)pic->f.data[3];
+    return (uintptr_t)pic->data[3];
 }
 
 #if !FF_API_BUFS_VDPAU

libavcodec/vdpau_mpeg12.c

@@ -43,12 +43,12 @@ static int vdpau_mpeg_start_frame(AVCodecContext *avctx,
 
     switch (s->pict_type) {
     case AV_PICTURE_TYPE_B:
-        ref = ff_vdpau_get_surface_id(&s->next_picture);
+        ref = ff_vdpau_get_surface_id(&s->next_picture.f);
         assert(ref != VDP_INVALID_HANDLE);
         info->backward_reference = ref;
         /* fall through to forward prediction */
     case AV_PICTURE_TYPE_P:
-        ref = ff_vdpau_get_surface_id(&s->last_picture);
+        ref = ff_vdpau_get_surface_id(&s->last_picture.f);
         info->forward_reference  = ref;
     }
 

libavcodec/vdpau_mpeg4.c

@@ -46,13 +46,13 @@ static int vdpau_mpeg4_start_frame(AVCodecContext *avctx,
 
     switch (s->pict_type) {
     case AV_PICTURE_TYPE_B:
-        ref = ff_vdpau_get_surface_id(&s->next_picture);
+        ref = ff_vdpau_get_surface_id(&s->next_picture.f);
         assert(ref != VDP_INVALID_HANDLE);
         info->backward_reference = ref;
         info->vop_coding_type    = 2;
         /* fall-through */
     case AV_PICTURE_TYPE_P:
-        ref = ff_vdpau_get_surface_id(&s->last_picture);
+        ref = ff_vdpau_get_surface_id(&s->last_picture.f);
         assert(ref != VDP_INVALID_HANDLE);
         info->forward_reference  = ref;
     }

libavcodec/vdpau_vc1.c

@@ -44,12 +44,12 @@ static int vdpau_vc1_start_frame(AVCodecContext *avctx,
 
     switch (s->pict_type) {
     case AV_PICTURE_TYPE_B:
-        ref = ff_vdpau_get_surface_id(&s->next_picture);
+        ref = ff_vdpau_get_surface_id(&s->next_picture.f);
         assert(ref != VDP_INVALID_HANDLE);
         info->backward_reference = ref;
         /* fall-through */
     case AV_PICTURE_TYPE_P:
-        ref = ff_vdpau_get_surface_id(&s->last_picture);
+        ref = ff_vdpau_get_surface_id(&s->last_picture.f);
         assert(ref != VDP_INVALID_HANDLE);
         info->forward_reference  = ref;
     }