[vlc-devel] [PATCH 31/42] video context: allow storing typed extra data in the video context

[Steve Lhomme]

Each video context can store extra objects, like the IDirect3DDevice9* for D3D9,
which is not found in the decoder device.
---
 include/vlc_picture.h       | 18 +++++++++++++++++-
 src/input/decoder_helpers.c | 16 +++++++++++++---
 src/libvlccore.sym          |  1 +
 src/video_output/display.c  |  2 +-
 4 files changed, 32 insertions(+), 5 deletions(-)

diff --git a/include/vlc_picture.h b/include/vlc_picture.h
index 9238e098956..9ca42b9b6e3 100644
--- a/include/vlc_picture.h
+++ b/include/vlc_picture.h
@@ -87,12 +87,28 @@ struct vlc_video_context_operations
     void (*destroy)(void *priv);
 };
 
+/** Decoder device type */
+enum vlc_video_context_type
+{
+    VLC_VIDEO_CONTEXT_NONE,
+    VLC_VIDEO_CONTEXT_VAAPI,
+    VLC_VIDEO_CONTEXT_VDPAU,
+    VLC_VIDEO_CONTEXT_DXVA2,
+    VLC_VIDEO_CONTEXT_D3D11VA,
+    VLC_VIDEO_CONTEXT_AWINDOW,
+    VLC_VIDEO_CONTEXT_NVDEC,
+    VLC_VIDEO_CONTEXT_CVPX,
+    VLC_VIDEO_CONTEXT_MMAL,
+};
+
 VLC_API vlc_video_context * vlc_video_context_Create(vlc_decoder_device *,
+                                        enum vlc_video_context_type private_type,
                                         size_t private_size,
                                         const struct vlc_video_context_operations *);
 VLC_API void vlc_video_context_Release(vlc_video_context *);
 
-VLC_API void *vlc_video_context_GetPrivate(vlc_video_context *);
+VLC_API enum vlc_video_context_type vlc_video_context_GetType(const vlc_video_context *);
+VLC_API void *vlc_video_context_GetPrivate(vlc_video_context *, enum vlc_video_context_type);
 VLC_API vlc_video_context *vlc_video_context_Hold(vlc_video_context *);
 
 /**
diff --git a/src/input/decoder_helpers.c b/src/input/decoder_helpers.c
index 612e9d0a8a6..ed13fc98785 100644
--- a/src/input/decoder_helpers.c
+++ b/src/input/decoder_helpers.c
@@ -188,11 +188,13 @@ struct vlc_video_context
     vlc_atomic_rc_t    rc;
     vlc_decoder_device *device;
     const struct vlc_video_context_operations *ops;
+    enum vlc_video_context_type private_type;
     size_t private_size;
     uint8_t private[];
 };
 
 vlc_video_context * vlc_video_context_Create(vlc_decoder_device *device,
+                                          enum vlc_video_context_type private_type,
                                           size_t private_size,
                                           const struct vlc_video_context_operations *ops)
 {
@@ -200,6 +202,7 @@ vlc_video_context * vlc_video_context_Create(vlc_decoder_device *device,
     if (unlikely(vctx == NULL))
         return NULL;
     vlc_atomic_rc_init( &vctx->rc );
+    vctx->private_type = private_type;
     vctx->private_size = private_size;
     vctx->device = device;
     if (vctx->device)
@@ -208,9 +211,16 @@ vlc_video_context * vlc_video_context_Create(vlc_decoder_device *device,
     return vctx;
 }
 
-void *vlc_video_context_GetPrivate(vlc_video_context *vctx)
+void *vlc_video_context_GetPrivate(vlc_video_context *vctx, enum vlc_video_context_type type)
 {
-    return &vctx->private;
+    if (vctx && vctx->private_type == type)
+        return &vctx->private;
+    return NULL;
+}
+
+enum vlc_video_context_type vlc_video_context_GetType(const vlc_video_context *vctx)
+{
+    return vctx->private_type;
 }
 
 vlc_video_context *vlc_video_context_Hold(vlc_video_context *vctx)
@@ -226,7 +236,7 @@ void vlc_video_context_Release(vlc_video_context *vctx)
         if (vctx->device)
             vlc_decoder_device_Release( vctx->device );
         if ( vctx->ops && vctx->ops->destroy )
-            vctx->ops->destroy( vlc_video_context_GetPrivate(vctx) );
+            vctx->ops->destroy( vlc_video_context_GetPrivate(vctx, vctx->private_type) );
         free(vctx);
     }
 }
diff --git a/src/libvlccore.sym b/src/libvlccore.sym
index 8ff8a2fb89d..d1a048be988 100644
--- a/src/libvlccore.sym
+++ b/src/libvlccore.sym
@@ -947,6 +947,7 @@ vlc_media_tree_Preparse
 vlc_viewpoint_to_4x4
 vlc_video_context_Create
 vlc_video_context_Release
+vlc_video_context_GetType
 vlc_video_context_GetPrivate
 vlc_video_context_Hold
 vlc_video_context_HoldDevice
diff --git a/src/video_output/display.c b/src/video_output/display.c
index 56245be3b08..f9fb3d0e7c2 100644
--- a/src/video_output/display.c
+++ b/src/video_output/display.c
@@ -770,7 +770,7 @@ vout_display_t *vout_display_New(vlc_object_t *parent,
     if (owner)
         vd->owner = *owner;
 
-    vlc_video_context *fake_vctx = vlc_video_context_Create(dec_device, 0, NULL);
+    vlc_video_context *fake_vctx = vlc_video_context_Create(dec_device, VLC_VIDEO_CONTEXT_NONE, 0, NULL);
 
     if (vlc_module_load(vd, "vout display", module, module && *module != '\0',
                         vout_display_start, vd, &osys->cfg, &vd->fmt,
-- 
2.17.1