va_android: allow app to specify which driver it wants to load

There is a platform which integrates two decode cores, and their
drivers are sperated and independent. Application needs to know which
driver it wants to use (e.g. H264 decode uses driver A, VP8 decode
uses driver B)

LIBVA_DRIVER_NAME has issues in one-process-multi-thread environment.
This patch allows application to specify the driver name via vaGetDisplay:

usage:
1. in normal case
int android_display=0
vaGetDisplay((void *)&android_display)

2. specify driver name
char driver_name[]="libva_driver_name=foo_drv_video.so"
vaGetDisplay((void *)driver_name)

Change-Id: I9f0f5ecb3565a25c1f6778093c80bb2fc24f24eb
Signed-off-by: Austin Yuan <shengquan.yuan@intel.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/va/android/va_android.cpp b/va/android/va_android.cpp
index 0c2b0b5..01ce1b9 100644
--- a/va/android/va_android.cpp
+++ b/va/android/va_android.cpp
@@ -116,7 +116,18 @@ static VAStatus va_DisplayContextGetDriverName (
     }
     drm_state->auth_type = VA_DRM_AUTH_CUSTOM;
 
-    return VA_DRM_GetDriverName(ctx, driver_name);
+    if (driver_name == NULL)
+        return VA_STATUS_ERROR_UNKNOWN;
+
+    if (strncmp((char *)ctx->native_dpy, "libva_driver_name=", 18) == 0) {
+            *driver_name = strdup((char *)ctx->native_dpy + 18);
+        if (*driver_name == NULL)
+            return VA_STATUS_ERROR_ALLOCATION_FAILED;
+        else
+            return VA_STATUS_SUCCESS;
+    } else {
+        return VA_DRM_GetDriverName(ctx, driver_name);
+    }
 }