avutil/hwcontext_amf: move AVMutex to internal context

doc/APIchanges

@@ -2,6 +2,9 @@ The last version increases of all libraries were on 2025-03-28
 
 API changes, most recent first:
 
+2025-11-18 - xxxxxxxxxx - lavu 60.19.100 - hwcontext_amf.h
+  avutil/hwcontext_amf: add lock and unlock for AVAMFDeviceContext.
+
 2025-11-16 - xxxxxxxxxx - lavu 60.18.100 - cpu.h
   Deprecate AV_CPU_FLAG_FORCE without replacement.
 

libavcodec/amfenc.c

@@ -564,9 +564,11 @@ static int amf_submit_frame_locked(AVCodecContext *avctx, AVFrame *frame, AMFSur
     AVHWDeviceContext     *hw_device_ctx = (AVHWDeviceContext*)ctx->device_ctx_ref->data;
     AVAMFDeviceContext    *amf_device_ctx = (AVAMFDeviceContext *)hw_device_ctx->hwctx;
 
-    ff_mutex_lock(&amf_device_ctx->mutex);
+    if (amf_device_ctx->lock)
+        amf_device_ctx->lock(amf_device_ctx->lock_ctx);
     ret = amf_submit_frame(avctx, frame, surface_resubmit);
-    ff_mutex_unlock(&amf_device_ctx->mutex);
+    if (amf_device_ctx->unlock)
+        amf_device_ctx->unlock(amf_device_ctx->lock_ctx);
 
     return ret;
 }

libavutil/hwcontext_amf.c

@@ -39,6 +39,7 @@
 #include "pixdesc.h"
 #include "pixfmt.h"
 #include "imgutils.h"
+#include "thread.h"
 #include "libavutil/avassert.h"
 #include <AMF/core/Surface.h>
 #include <AMF/core/Trace.h>
@@ -49,6 +50,15 @@
 #endif
 #define FFMPEG_AMF_WRITER_ID L"ffmpeg_amf"
 
+static void amf_lock_default(void *opaque)
+{
+    ff_mutex_lock((AVMutex*)opaque);
+}
+
+static void amf_unlock_default(void *opaque)
+{
+    ff_mutex_unlock((AVMutex*)opaque);
+}
 
 typedef struct AmfTraceWriter {
     AMFTraceWriterVtbl *vtblp;
@@ -352,7 +362,7 @@ static int amf_transfer_data_from(AVHWFramesContext *ctx, AVFrame *dst,
 
 static void amf_device_uninit(AVHWDeviceContext *device_ctx)
 {
-    AVAMFDeviceContext      *amf_ctx = device_ctx->hwctx;
+    AVAMFDeviceContext *amf_ctx = device_ctx->hwctx;
     AMF_RESULT          res = AMF_NOT_INITIALIZED;
     AMFTrace           *trace;
 
@@ -377,8 +387,14 @@ static void amf_device_uninit(AVHWDeviceContext *device_ctx)
         amf_writer_free(amf_ctx->trace_writer);
     }
 
+    if (amf_ctx->lock_ctx == amf_lock_default) {
+        ff_mutex_destroy((AVMutex*)amf_ctx->lock_ctx);
+        av_freep(&amf_ctx->lock_ctx);
+        amf_ctx->lock = NULL;
+        amf_ctx->unlock = NULL;
+    }
+
     amf_ctx->version = 0;
-    ff_mutex_destroy(&amf_ctx->mutex);
 }
 
 static int amf_device_init(AVHWDeviceContext *ctx)
@@ -387,6 +403,16 @@ static int amf_device_init(AVHWDeviceContext *ctx)
     AMFContext1 *context1 = NULL;
     AMF_RESULT res;
 
+    if (!amf_ctx->lock) {
+        amf_ctx->lock_ctx = av_mallocz(sizeof(AVMutex));
+        if (!amf_ctx->lock_ctx) {
+            return AVERROR(ENOMEM);
+        }
+        ff_mutex_init((AVMutex*)amf_ctx->lock_ctx, NULL);
+        amf_ctx->lock   = amf_lock_default;
+        amf_ctx->unlock = amf_unlock_default;
+    }
+
 #ifdef _WIN32
     res = amf_ctx->context->pVtbl->InitDX11(amf_ctx->context, NULL, AMF_DX11_1);
     if (res == AMF_OK || res == AMF_ALREADY_INITIALIZED) {
@@ -415,7 +441,7 @@ static int amf_device_init(AVHWDeviceContext *ctx)
         }
      }
 #endif
-    ff_mutex_init(&amf_ctx->mutex, NULL);
+
     return 0;
 }
 

libavutil/hwcontext_amf.h

@@ -26,7 +26,6 @@
 #include <AMF/core/Context.h>
 #include <AMF/core/Trace.h>
 #include <AMF/core/Debug.h>
-#include "thread.h"
 
 /**
  * This struct is allocated as AVHWDeviceContext.hwctx
@@ -39,7 +38,10 @@ typedef struct AVAMFDeviceContext {
     int64_t             version; ///< version of AMF runtime
     AMFContext         *context;
     AMF_MEMORY_TYPE     memory_type;
-	AVMutex             mutex;
+
+    void (*lock)(void *lock_ctx);
+    void (*unlock)(void *lock_ctx);
+    void *lock_ctx;
 } AVAMFDeviceContext;
 
 enum AMF_SURFACE_FORMAT av_av_to_amf_format(enum AVPixelFormat fmt);

libavutil/version.h

@@ -79,7 +79,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  60
-#define LIBAVUTIL_VERSION_MINOR  18
+#define LIBAVUTIL_VERSION_MINOR  19
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \