[FFmpeg-cvslog] hwcontext_vulkan: add a setting to limit queues

[Lynne]

ffmpeg | branch: master | Lynne <dev at lynne.ee> | Thu Jun  5 00:52:23 2025 +0900| [f531c91170773032c2c8ab7d390e7a6a1382c77b] | committer: Lynne

hwcontext_vulkan: add a setting to limit queues

If its a problem, you'll likely want to set it to 1 than more fine-grained
control, which you can already do via the API.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f531c91170773032c2c8ab7d390e7a6a1382c77b
---

 libavutil/hwcontext_vulkan.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/libavutil/hwcontext_vulkan.c b/libavutil/hwcontext_vulkan.c
index 1c298a0b18..6402030afe 100644
--- a/libavutil/hwcontext_vulkan.c
+++ b/libavutil/hwcontext_vulkan.c
@@ -143,6 +143,9 @@ typedef struct VulkanDevicePriv {
     /* Disable multiplane images */
     int disable_multiplane;
 
+    /* Maximum queues */
+    int limit_queues;
+
     /* Nvidia */
     int dev_is_nvidia;
 } VulkanDevicePriv;
@@ -1509,9 +1512,14 @@ static int setup_queue_families(AVHWDeviceContext *ctx, VkDeviceCreateInfo *cd)
         if (i == hwctx->nb_qf) {                                         \
             hwctx->qf[i].idx = idx;                                      \
             hwctx->qf[i].num = qf[idx].queueFamilyProperties.queueCount; \
-            if (dprops.driverID == VK_DRIVER_ID_NVIDIA_PROPRIETARY) {    \
+            if (p->limit_queues ||                                       \
+                dprops.driverID == VK_DRIVER_ID_NVIDIA_PROPRIETARY) {    \
+                int max = p->limit_queues;                               \
                 if (type == VK_QUEUE_GRAPHICS_BIT)                       \
-                    hwctx->qf[i].num = FFMIN(hwctx->qf[i].num, 1);       \
+                    hwctx->qf[i].num = FFMIN(hwctx->qf[i].num,           \
+                                             max ? max : 1);             \
+                else if (max)                                            \
+                    hwctx->qf[i].num = FFMIN(hwctx->qf[i].num, max);     \
             }                                                            \
             hwctx->qf[i].flags = type;                                   \
             hwctx->qf[i].video_caps = vid_op;                            \
@@ -1718,6 +1726,11 @@ static int vulkan_device_create_internal(AVHWDeviceContext *ctx,
     if (opt_d)
         p->use_linear_images = strtol(opt_d->value, NULL, 10);
 
+    /* Limit queues to a given number if needed */
+    opt_d = av_dict_get(opts, "limit_queues", NULL, 0);
+    if (opt_d)
+        p->limit_queues = strtol(opt_d->value, NULL, 10);
+
     /* The disable_multiplane argument takes precedent over the option */
     p->disable_multiplane = disable_multiplane;
     if (!p->disable_multiplane) {