dnn: add a new interface DNNModel.get_output

for some cases (for example, super resolution), the DNN model changes
the frame size which impacts the filter behavior, so the filter needs
to know the out frame size at very beginning.

Currently, the filter reuses DNNModule.execute_model to query the
out frame size, it is not clear from interface perspective, so add
a new explict interface DNNModel.get_output for such query.

1 files changed, 4 insertions, 13 deletions

diff --git a/libavfilter/vf_dnn_processing.c b/libavfilter/vf_dnn_processing.c
index 2c8578c9b0..334243bd2b 100644
--- a/libavfilter/vf_dnn_processing.c
+++ b/libavfilter/vf_dnn_processing.c
@@ -233,24 +233,15 @@ static int config_output(AVFilterLink *outlink)
     DnnProcessingContext *ctx = context->priv;
     DNNReturnType result;
     AVFilterLink *inlink = context->inputs[0];
-    AVFrame *out = NULL;
-
-    AVFrame *fake_in = ff_get_video_buffer(inlink, inlink->w, inlink->h);
 
     // have a try run in case that the dnn model resize the frame
-    out = ff_get_video_buffer(inlink, inlink->w, inlink->h);
-    result = (ctx->dnn_module->execute_model)(ctx->model, ctx->model_inputname, fake_in,
-                                              (const char **)&ctx->model_outputname, 1, out);
-    if (result != DNN_SUCCESS){
-        av_log(ctx, AV_LOG_ERROR, "failed to execute model\n");
+    result = ctx->model->get_output(ctx->model->model, ctx->model_inputname, inlink->w, inlink->h,
+                                    ctx->model_outputname, &outlink->w, &outlink->h);
+    if (result != DNN_SUCCESS) {
+        av_log(ctx, AV_LOG_ERROR, "could not get output from the model\n");
         return AVERROR(EIO);
     }
 
-    outlink->w = out->width;
-    outlink->h = out->height;
-
-    av_frame_free(&fake_in);
-    av_frame_free(&out);
     prepare_uv_scale(outlink);
 
     return 0;