mfc: Check device capabilities before doing anything else

diff --git a/sys/mfc/mfc_decoder/mfc_decoder.c b/sys/mfc/mfc_decoder/mfc_decoder.c
index c835f0d362ee4ff42f333c32458c8054ff29fd0d..9070920d9d544b593555716a10744f5ee5d069dd 100644 (file)
--- a/sys/mfc/mfc_decoder/mfc_decoder.c
+++ b/sys/mfc/mfc_decoder/mfc_decoder.c
@@ -276,6 +276,7 @@ static int request_output_buffers(struct mfc_dec_context *ctx, int num)
 struct mfc_dec_context* mfc_dec_create(unsigned int codec, int num_input_buffers)
 {
     struct mfc_dec_context *ctx;
+    struct v4l2_capability caps;
 
     pthread_mutex_lock(&mutex);
     if (mfc_in_use) {
@@ -301,6 +302,21 @@ struct mfc_dec_context* mfc_dec_create(unsigned int codec, int num_input_buffers
         free(ctx);
         return NULL;
     }
+
+    if (ioctl (ctx->fd, VIDIOC_QUERYCAP, &caps) < 0) {
+        GST_ERROR ("Unable to query capabilities: %d", errno);
+        mfc_dec_destroy(ctx);
+        return NULL;
+    }
+
+    if ((caps.capabilities & V4L2_CAP_STREAMING) == 0 ||
+        (caps.capabilities & V4L2_CAP_VIDEO_OUTPUT_MPLANE) == 0 ||
+        (caps.capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE) == 0) {
+        GST_ERROR ("Required capabilities not available");
+        mfc_dec_destroy(ctx);
+        return NULL;
+    }
+
     if (mfc_dec_set_codec(ctx, codec) ||
         request_input_buffers(ctx, num_input_buffers)) {
         mfc_dec_destroy(ctx);