lavu: add a way to query hwcontext frame constraints

Signed-off-by: Anton Khirnov <anton@khirnov.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/libavutil/hwcontext_internal.h b/libavutil/hwcontext_internal.h
index 641232f140..27de1f9e62 100644
--- a/libavutil/hwcontext_internal.h
+++ b/libavutil/hwcontext_internal.h
@@ -48,6 +48,12 @@ typedef struct HWContextType {
     size_t             device_priv_size;
 
     /**
+     * Size of the hardware-specific device configuration.
+     * (Used to query hwframe constraints.)
+     */
+    size_t             device_hwconfig_size;
+
+    /**
      * size of the public frame pool hardware-specific context,
      * i.e. AVHWFramesContext.hwctx
      */
@@ -61,6 +67,10 @@ typedef struct HWContextType {
     int              (*device_init)(AVHWDeviceContext *ctx);
     void             (*device_uninit)(AVHWDeviceContext *ctx);
 
+    int              (*frames_get_constraints)(AVHWDeviceContext *ctx,
+                                               const void *hwconfig,
+                                               AVHWFramesConstraints *constraints);
+
     int              (*frames_init)(AVHWFramesContext *ctx);
     void             (*frames_uninit)(AVHWFramesContext *ctx);