From: wm4 <nfx...@googlemail.com>

This "reuses" the flags introduced for the av_vdpau_bind_context() API
function, and makes them available to all hwaccels. This does not affect
the current vdpau API, as av_vdpau_bind_context() should obviously
override the AVCodecContext.hwaccel_flags flags for the sake of
compatibility.
---
 doc/APIchanges             | 4 ++++
 libavcodec/avcodec.h       | 9 +++++++++
 libavcodec/pthread_frame.c | 2 ++
 3 files changed, 15 insertions(+)

diff --git a/doc/APIchanges b/doc/APIchanges
index a919ffb2b..3bf392465 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -13,6 +13,10 @@ libavutil:     2015-08-28
 
 API changes, most recent first:
 
+2017-02-xx - xxxxxxx - lavc - avcodec.h
+  Add AVCodecContext.hwaccel_flags field. This will control some hwaccels at
+  a later point.
+
 2017-xx-xx - xxxxxxx - lavc 57.34.0 - avcodec.h
   Add AVCodecContext.hw_device_ctx.
 
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 489a618cb..da4eb4081 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -3163,6 +3163,15 @@ typedef struct AVCodecContext {
      * contexts used must be created on the same device.
      */
     AVBufferRef *hw_device_ctx;
+
+    /**
+     * Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated
+     * decoding (if active).
+     * - encoding: unused
+     * - decoding: Set by user (either before avcodec_open2(), or in the
+     *             AVCodecContext.get_format callback)
+     */
+    int hwaccel_flags;
 } AVCodecContext;
 
 /**
diff --git a/libavcodec/pthread_frame.c b/libavcodec/pthread_frame.c
index f3a74c0bd..65a04d8e9 100644
--- a/libavcodec/pthread_frame.c
+++ b/libavcodec/pthread_frame.c
@@ -270,6 +270,8 @@ FF_ENABLE_DEPRECATION_WARNINGS
                     return AVERROR(ENOMEM);
             }
         }
+
+        dst->hwaccel_flags = src->hwaccel_flags;
     }
 
     if (for_user) {
-- 
2.11.0

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