lavu/hwcontext_vaapi: Add option to allow to specify vendor id when init hw device

Vendor id will help to select desired device in case of kernel driver is
unknow or unsupported, for vendor may support different kernel driver on
different platforms.

Signed-off-by: Fei Wang <fei.w.wang@intel.com>

doc/ffmpeg.texi

@@ -1458,6 +1458,11 @@ The following options are recognized:
 When @var{device} is not specified, use this option to specify the name of the kernel
 driver associated with the desired device. This option is available only when
 the hardware acceleration method @emph{drm} and @emph{vaapi} are enabled.
+@item vendor_id
+When @var{device} and @var{kernel_driver} are not specified, use this option to specify
+the vendor id associated with the desired device. This option is available only when the
+hardware acceleration method @emph{drm} and @emph{vaapi} are enabled and @emph{kernel_driver}
+is not specified.
 @end table
 
 Examples:
@@ -1473,6 +1478,9 @@ Create a vaapi device on DirectX adapter 1.
 
 @item -init_hw_device vaapi:,kernel_driver=i915
 Create a vaapi device on a device associated with kernel driver @samp{i915}.
+
+@item -init_hw_device vaapi:,vendor_id=0x8086
+Create a vaapi device on a device associated with vendor id @samp{0x8086}.
 @end table
 
 @item vdpau

libavutil/hwcontext_vaapi.c

@@ -1748,7 +1748,9 @@ static int vaapi_device_create(AVHWDeviceContext *ctx, const char *device,
 #if CONFIG_LIBDRM
             drmVersion *info;
             const AVDictionaryEntry *kernel_driver;
+            const AVDictionaryEntry *vendor_id;
             kernel_driver = av_dict_get(opts, "kernel_driver", NULL, 0);
+            vendor_id = av_dict_get(opts, "vendor_id", NULL, 0);
 #endif
             for (n = 0; n < max_devices; n++) {
                 snprintf(path, sizeof(path),
@@ -1803,6 +1805,33 @@ static int vaapi_device_create(AVHWDeviceContext *ctx, const char *device,
                     close(priv->drm_fd);
                     priv->drm_fd = -1;
                     continue;
+                } else if (vendor_id) {
+                    drmDevicePtr device;
+                    char drm_vendor[8];
+                    if (drmGetDevice(priv->drm_fd, &device)) {
+                        av_log(ctx, AV_LOG_VERBOSE,
+                               "Failed to get DRM device info for device %d.\n", n);
+                        close(priv->drm_fd);
+                        priv->drm_fd = -1;
+                        continue;
+                    }
+
+                    snprintf(drm_vendor, sizeof(drm_vendor), "0x%x", device->deviceinfo.pci->vendor_id);
+                    if (strcmp(vendor_id->value, drm_vendor)) {
+                        av_log(ctx, AV_LOG_VERBOSE, "Ignoring device %d "
+                               "with non-matching vendor id (%s).\n",
+                               n, vendor_id->value);
+                        drmFreeDevice(&device);
+                        close(priv->drm_fd);
+                        priv->drm_fd = -1;
+                        continue;
+                    }
+                    av_log(ctx, AV_LOG_VERBOSE, "Trying to use "
+                           "DRM render node for device %d, "
+                           "with matching vendor id (%s).\n",
+                           n, vendor_id->value);
+                    drmFreeDevice(&device);
+                    break;
                 }
                 drmFreeVersion(info);
 #endif

libavutil/version.h

@@ -79,7 +79,7 @@
  */
 
 #define LIBAVUTIL_VERSION_MAJOR  59
-#define LIBAVUTIL_VERSION_MINOR  32
+#define LIBAVUTIL_VERSION_MINOR  33
 #define LIBAVUTIL_VERSION_MICRO 100
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \