hwcontext_vulkan: only use one semaphore per image

The idea was to allow separate planes to be filtered independently, however,
in hindsight, literaly nothing uses separate per-plane semaphores and it
would only work when each plane is backed by separate device memory.

libavfilter/vulkan.c

@@ -390,32 +390,28 @@ int ff_vk_add_exec_dep(AVFilterContext *avctx, FFVkExecContext *e,
                        AVFrame *frame, VkPipelineStageFlagBits in_wait_dst_flag)
 {
     AVVkFrame *f = (AVVkFrame *)frame->data[0];
-    AVHWFramesContext *fc = (AVHWFramesContext *)frame->hw_frames_ctx->data;
-    int planes = av_pix_fmt_count_planes(fc->sw_format);
 
-    for (int i = 0; i < planes; i++) {
-        e->sem_wait = av_fast_realloc(e->sem_wait, &e->sem_wait_alloc,
-                                      (e->sem_wait_cnt + 1)*sizeof(*e->sem_wait));
-        if (!e->sem_wait)
-            return AVERROR(ENOMEM);
+    e->sem_wait = av_fast_realloc(e->sem_wait, &e->sem_wait_alloc,
+                                  (e->sem_wait_cnt + 1)*sizeof(*e->sem_wait));
+    if (!e->sem_wait)
+        return AVERROR(ENOMEM);
 
-        e->sem_wait_dst = av_fast_realloc(e->sem_wait_dst, &e->sem_wait_dst_alloc,
-                                          (e->sem_wait_cnt + 1)*sizeof(*e->sem_wait_dst));
-        if (!e->sem_wait_dst)
-            return AVERROR(ENOMEM);
+    e->sem_wait_dst = av_fast_realloc(e->sem_wait_dst, &e->sem_wait_dst_alloc,
+                                      (e->sem_wait_cnt + 1)*sizeof(*e->sem_wait_dst));
+    if (!e->sem_wait_dst)
+        return AVERROR(ENOMEM);
 
-        e->sem_sig = av_fast_realloc(e->sem_sig, &e->sem_sig_alloc,
-                                     (e->sem_sig_cnt + 1)*sizeof(*e->sem_sig));
-        if (!e->sem_sig)
-            return AVERROR(ENOMEM);
+    e->sem_sig = av_fast_realloc(e->sem_sig, &e->sem_sig_alloc,
+                                 (e->sem_sig_cnt + 1)*sizeof(*e->sem_sig));
+    if (!e->sem_sig)
+        return AVERROR(ENOMEM);
 
-        e->sem_wait[e->sem_wait_cnt] = f->sem[i];
-        e->sem_wait_dst[e->sem_wait_cnt] = in_wait_dst_flag;
-        e->sem_wait_cnt++;
+    e->sem_wait[e->sem_wait_cnt] = f->sem;
+    e->sem_wait_dst[e->sem_wait_cnt] = in_wait_dst_flag;
+    e->sem_wait_cnt++;
 
-        e->sem_sig[e->sem_sig_cnt] = f->sem[i];
-        e->sem_sig_cnt++;
-    }
+    e->sem_sig[e->sem_sig_cnt] = f->sem;
+    e->sem_sig_cnt++;
 
     return 0;
 }

libavutil/hwcontext_vulkan.h

@@ -133,10 +133,10 @@ typedef struct AVVkFrame {
     VkImageLayout layout[AV_NUM_DATA_POINTERS];
 
     /**
-     * Per-image semaphores. Must not be freed manually. Must be waited on
+     * Per-frame semaphore. Must not be freed manually. Must be waited on
      * and signalled at every queue submission.
      */
-    VkSemaphore sem[AV_NUM_DATA_POINTERS];
+    VkSemaphore sem;
 
     /**
      * Internal data.