avfilter/dnn: Refactor DNN parameter configuration system
This patch trying to resolve mulitiple issues related to parameter configuration: Firstly, each DNN filters duplicate DNN_COMMON_OPTIONS, which should be the common options of backend. Secondly, backend options are hidden behind the scene. It's a AV_OPT_TYPE_STRING backend_configs for user, and parsed by each backend. We don't know each backend support what kind of options from the help message. Third, DNN backends duplicate DNN_BACKEND_COMMON_OPTIONS. Last but not the least, pass backend options via AV_OPT_TYPE_STRING makes it hard to pass AV_OPT_TYPE_BINARY to backend, if not impossible. This patch puts backend common options and each backend options inside DnnContext to reduce code duplication, make options user friendly, and easy to extend for future usecase. For example, ./ffmpeg -h filter=dnn_processing dnn_processing AVOptions: dnn_backend <int> ..FV....... DNN backend (from INT_MIN to INT_MAX) (default tensorflow) tensorflow 1 ..FV....... tensorflow backend flag openvino 2 ..FV....... openvino backend flag torch 3 ..FV....... torch backend flag dnn_base AVOptions: model <string> ..F........ path to model file input <string> ..F........ input name of the model output <string> ..F........ output name of the model backend_configs <string> ..F.......P backend configs (deprecated) options <string> ..F.......P backend configs (deprecated) nireq <int> ..F........ number of request (from 0 to INT_MAX) (default 0) async <boolean> ..F........ use DNN async inference (default true) device <string> ..F........ device to run model dnn_tensorflow AVOptions: sess_config <string> ..F........ config for SessionOptions dnn_openvino AVOptions: batch_size <int> ..F........ batch size per request (from 1 to 1000) (default 1) input_resizable <boolean> ..F........ can input be resizable or not (default false) layout <int> ..F........ input layout of model (from 0 to 2) (default none) none 0 ..F........ none nchw 1 ..F........ nchw nhwc 2 ..F........ nhwc scale <float> ..F........ Add scale preprocess operation. Divide each element of input by specified value. (from INT_MIN to INT_MAX) (default 0) mean <float> ..F........ Add mean preprocess operation. Subtract specified value from each element of input. (from INT_MIN to INT_MAX) (default 0) dnn_th AVOptions: optimize <int> ..F........ turn on graph executor optimization (from 0 to 1) (default 0) Signed-off-by:Zhao Zhili <zhilizhao@tencent.com> Reviewed-by:
Wenbin Chen <wenbin.chen@intel.com> Reviewed-by:
Guo Yejun <yejun.guo@intel.com>
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