nvenc: Port to GstCudaContext

... and add support CUDA context sharing similar to glcontext sharing.
Multiple CUDA context per GPU is not the best practice. The context
sharing method is very similar to that of glcontext. The difference
is that there can be multiple context object on a pipeline since
the CUDA context is created per GPU id. For example, a pipeline
has nvh264dec (uses GPU #0) and nvh264device0dec (uses GPU #1),
then two CUDA context will propagated to all pipeline.

sys/nvcodec/gstnvbaseenc.c

@@ -22,6 +22,7 @@
 #endif
 
 #include "gstnvbaseenc.h"
+#include "gstcudautils.h"
 
 #include <gst/pbutils/codec-utils.h>
 
@@ -292,10 +293,9 @@ gst_nv_base_enc_open (GstVideoEncoder * enc)
   GstNvBaseEncClass *klass = GST_NV_BASE_ENC_GET_CLASS (enc);
   GValue *formats = NULL;
 
-  nvenc->cuda_ctx = gst_nvenc_create_cuda_context (klass->cuda_device_id);
+  if (!gst_cuda_ensure_element_context (GST_ELEMENT_CAST (enc),
-  if (nvenc->cuda_ctx == NULL) {
+          klass->cuda_device_id, &nvenc->cuda_ctx)) {
-    GST_ELEMENT_ERROR (enc, LIBRARY, INIT, (NULL),
+    GST_ERROR_OBJECT (nvenc, "failed to create CUDA context");
-        ("Failed to create CUDA context, perhaps CUDA is not supported."));
     return FALSE;
   }
 
@@ -305,13 +305,12 @@ gst_nv_base_enc_open (GstVideoEncoder * enc)
 
     params.version = NV_ENC_OPEN_ENCODE_SESSION_EX_PARAMS_VER;
     params.apiVersion = NVENCAPI_VERSION;
-    params.device = nvenc->cuda_ctx;
+    params.device = gst_cuda_context_get_handle (nvenc->cuda_ctx);
     params.deviceType = NV_ENC_DEVICE_TYPE_CUDA;
     nv_ret = NvEncOpenEncodeSessionEx (&params, &nvenc->encoder);
     if (nv_ret != NV_ENC_SUCCESS) {
       GST_ERROR ("Failed to create NVENC encoder session, ret=%d", nv_ret);
-      if (gst_nvenc_destroy_cuda_context (nvenc->cuda_ctx))
+      gst_clear_object (&nvenc->cuda_ctx);
-        nvenc->cuda_ctx = NULL;
       return FALSE;
     }
     GST_INFO ("created NVENC encoder %p", nvenc->encoder);
@@ -333,9 +332,14 @@ gst_nv_base_enc_open (GstVideoEncoder * enc)
 static void
 gst_nv_base_enc_set_context (GstElement * element, GstContext * context)
 {
-#if HAVE_NVCODEC_GST_GL
   GstNvBaseEnc *nvenc = GST_NV_BASE_ENC (element);
+  GstNvBaseEncClass *klass = GST_NV_BASE_ENC_GET_CLASS (nvenc);
 
+  if (gst_cuda_handle_set_context (element, context, klass->cuda_device_id,
+          &nvenc->cuda_ctx)) {
+    goto done;
+  }
+#if HAVE_NVCODEC_GST_GL
   gst_gl_handle_set_context (element, context,
       (GstGLDisplay **) & nvenc->display,
       (GstGLContext **) & nvenc->other_context);
@@ -344,32 +348,38 @@ gst_nv_base_enc_set_context (GstElement * element, GstContext * context)
         SUPPORTED_GL_APIS);
 #endif
 
+done:
   GST_ELEMENT_CLASS (parent_class)->set_context (element, context);
 }
 
 static gboolean
 gst_nv_base_enc_sink_query (GstVideoEncoder * enc, GstQuery * query)
 {
-#if HAVE_NVCODEC_GST_GL
   GstNvBaseEnc *nvenc = GST_NV_BASE_ENC (enc);
-#endif
 
   switch (GST_QUERY_TYPE (query)) {
-#if HAVE_NVCODEC_GST_GL
     case GST_QUERY_CONTEXT:{
+      if (gst_cuda_handle_context_query (GST_ELEMENT (nvenc),
+              query, nvenc->cuda_ctx))
+        return TRUE;
+
+#if HAVE_NVCODEC_GST_GL
+      {
         gboolean ret;
 
         ret = gst_gl_handle_context_query ((GstElement *) nvenc, query,
             nvenc->display, NULL, nvenc->other_context);
-      if (nvenc->display)
+        if (nvenc->display) {
           gst_gl_display_filter_gl_api (GST_GL_DISPLAY (nvenc->display),
               SUPPORTED_GL_APIS);
+        }
 
         if (ret)
           return ret;
-      break;
       }
 #endif
+      break;
+    }
     default:
       break;
   }
@@ -629,11 +639,7 @@ gst_nv_base_enc_close (GstVideoEncoder * enc)
     nvenc->encoder = NULL;
   }
 
-  if (nvenc->cuda_ctx) {
+  gst_clear_object (&nvenc->cuda_ctx);
-    if (!gst_nvenc_destroy_cuda_context (nvenc->cuda_ctx))
-      return FALSE;
-    nvenc->cuda_ctx = NULL;
-  }
 
   GST_OBJECT_LOCK (nvenc);
   if (nvenc->input_formats)
@@ -977,7 +983,7 @@ gst_nv_base_enc_free_buffers (GstNvBaseEnc * nvenc)
     if (nvenc->gl_input) {
       struct gl_input_resource *in_gl_resource = nvenc->input_bufs[i];
 
-      CuCtxPushCurrent (nvenc->cuda_ctx);
+      gst_cuda_context_push (nvenc->cuda_ctx);
 
       if (in_gl_resource->mapped) {
         GST_LOG_OBJECT (nvenc, "Unmap resource %p", in_gl_resource);
@@ -1006,7 +1012,7 @@ gst_nv_base_enc_free_buffers (GstNvBaseEnc * nvenc)
       }
 
       g_free (in_gl_resource);
-      CuCtxPopCurrent (NULL);
+      gst_cuda_context_pop (NULL);
     } else
 #endif
     {
@@ -1306,7 +1312,7 @@ gst_nv_base_enc_set_format (GstVideoEncoder * enc, GstVideoCodecState * state)
         pixel_depth += GST_VIDEO_INFO_COMP_DEPTH (info, i);
       }
 
-      CuCtxPushCurrent (nvenc->cuda_ctx);
+      gst_cuda_context_push (nvenc->cuda_ctx);
       for (i = 0; i < nvenc->n_bufs; ++i) {
         struct gl_input_resource *in_gl_resource =
             g_new0 (struct gl_input_resource, 1);
@@ -1353,7 +1359,7 @@ gst_nv_base_enc_set_format (GstVideoEncoder * enc, GstVideoCodecState * state)
         g_async_queue_push (nvenc->in_bufs_pool, nvenc->input_bufs[i]);
       }
 
-      CuCtxPopCurrent (NULL);
+      gst_cuda_context_pop (NULL);
     } else
 #endif
     {
@@ -1489,7 +1495,7 @@ _map_gl_input_buffer (GstGLContext * context, struct map_gl_input *data)
   guint i;
   CUDA_MEMCPY2D param;
 
-  CuCtxPushCurrent (data->nvenc->cuda_ctx);
+  gst_cuda_context_push (data->nvenc->cuda_ctx);
   data_pointer = data->in_gl_resource->cuda_pointer;
   for (i = 0; i < GST_VIDEO_INFO_N_PLANES (data->info); i++) {
     GstGLBuffer *gl_buf_obj;
@@ -1585,7 +1591,7 @@ _map_gl_input_buffer (GstGLContext * context, struct map_gl_input *data)
     data_pointer = data_pointer +
         dest_stride * _get_plane_height (&data->nvenc->input_info, i);
   }
-  CuCtxPopCurrent (NULL);
+  gst_cuda_context_pop (NULL);
 }
 #endif
 

sys/nvcodec/gstnvbaseenc.h

@@ -23,6 +23,7 @@
 #include "gstnvenc.h"
 
 #include <gst/video/gstvideoencoder.h>
+#include "gstcudacontext.h"
 
 #define GST_TYPE_NV_BASE_ENC \
   (gst_nv_base_enc_get_type())
@@ -70,7 +71,7 @@ typedef struct {
   guint           bitrate;
   gint            gop_size;
 
-  CUcontext       cuda_ctx;
+  GstCudaContext * cuda_ctx;
   void          * encoder;
 
   /* the supported input formats */

sys/nvcodec/gstnvenc.c

@@ -285,78 +285,6 @@ gst_nvenc_get_nv_buffer_format (GstVideoFormat fmt)
   return NV_ENC_BUFFER_FORMAT_UNDEFINED;
 }
 
-CUcontext
-gst_nvenc_create_cuda_context (guint device_id)
-{
-  CUcontext cuda_ctx, old_ctx;
-  CUresult cres = CUDA_SUCCESS;
-  CUdevice cdev = 0, cuda_dev = -1;
-  int dev_count = 0;
-  char name[256];
-  int min = 0, maj = 0;
-  int i;
-
-  GST_INFO ("Initialising CUDA..");
-
-  cres = CuInit (0);
-
-  if (cres != CUDA_SUCCESS) {
-    GST_WARNING ("Failed to initialise CUDA, error code: 0x%08x", cres);
-    return NULL;
-  }
-
-  GST_INFO ("Initialised CUDA");
-
-  cres = CuDeviceGetCount (&dev_count);
-  if (cres != CUDA_SUCCESS || dev_count == 0) {
-    GST_WARNING ("No CUDA devices detected");
-    return NULL;
-  }
-
-  GST_INFO ("%d CUDA device(s) detected", dev_count);
-  for (i = 0; i < dev_count; ++i) {
-    if (CuDeviceGet (&cdev, i) == CUDA_SUCCESS
-        && CuDeviceGetName (name, sizeof (name), cdev) == CUDA_SUCCESS
-        && CuDeviceGetAttribute (&maj,
-            CU_DEVICE_ATTRIBUTE_COMPUTE_CAPABILITY_MAJOR, cdev) == CUDA_SUCCESS
-        && CuDeviceGetAttribute (&min,
-            CU_DEVICE_ATTRIBUTE_COMPUTE_CAPABILITY_MINOR,
-            cdev) == CUDA_SUCCESS) {
-      GST_INFO ("GPU #%d supports NVENC: %s (%s) (Compute SM %d.%d)", i,
-          (((maj << 4) + min) >= 0x30) ? "yes" : "no", name, maj, min);
-      if (i == device_id) {
-        cuda_dev = cdev;
-      }
-    }
-  }
-
-  if (cuda_dev == -1) {
-    GST_WARNING ("Device with id %d does not exist or does not support NVENC",
-        device_id);
-    return NULL;
-  }
-
-  if (CuCtxCreate (&cuda_ctx, 0, cuda_dev) != CUDA_SUCCESS) {
-    GST_WARNING ("Failed to create CUDA context for cuda device %d", cuda_dev);
-    return NULL;
-  }
-
-  if (CuCtxPopCurrent (&old_ctx) != CUDA_SUCCESS) {
-    return NULL;
-  }
-
-  GST_INFO ("Created CUDA context %p", cuda_ctx);
-
-  return cuda_ctx;
-}
-
-gboolean
-gst_nvenc_destroy_cuda_context (CUcontext ctx)
-{
-  GST_INFO ("Destroying CUDA context %p", ctx);
-  return (CuCtxDestroy (ctx) == CUDA_SUCCESS);
-}
-
 static gboolean
 load_nvenc_library (void)
 {

sys/nvcodec/gstnvenc.h

@@ -28,10 +28,6 @@
 
 GST_DEBUG_CATEGORY_EXTERN (gst_nvenc_debug);
 
-CUcontext               gst_nvenc_create_cuda_context (guint device_id);
-
-gboolean                gst_nvenc_destroy_cuda_context (CUcontext ctx);
-
 gboolean                gst_nvenc_cmp_guid (GUID g1, GUID g2);
 
 NV_ENC_BUFFER_FORMAT    gst_nvenc_get_nv_buffer_format (GstVideoFormat fmt);