/* * Copyright (c) 2018 Sergey Lavrushkin * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * DNN inference engine interface. */ #ifndef AVFILTER_DNN_INTERFACE_H#define AVFILTER_DNN_INTERFACE_H #include <stdint.h>#include "libavutil/frame.h"#include "avfilter.h" typedef enum {DNN_SUCCESS, DNN_ERROR} DNNReturnType; typedef enum {DNN_NATIVE, DNN_TF, DNN_OV} DNNBackendType; typedef enum {DNN_FLOAT = 1, DNN_UINT8 = 4} DNNDataType; typedef enum {    DCO_NONE,    DCO_BGR,    DCO_RGB,} DNNColorOrder; typedef enum {    DAST_FAIL,              // something wrong    DAST_EMPTY_QUEUE,       // no more inference result to get    DAST_NOT_READY,         // all queued inferences are not finished    DAST_SUCCESS            // got a result frame successfully} DNNAsyncStatusType; typedef enum {    DFT_NONE,    DFT_PROCESS_FRAME,      // process the whole frame    DFT_ANALYTICS_DETECT,   // detect from the whole frame    DFT_ANALYTICS_CLASSIFY, // classify for each bounding box}DNNFunctionType; typedef struct DNNData{    void *data;    int width, height, channels;    // dt and order together decide the color format    DNNDataType dt;    DNNColorOrder order;} DNNData; typedef struct DNNExecBaseParams {    const char *input_name;    const char **output_names;    uint32_t nb_output;    AVFrame *in_frame;    AVFrame *out_frame;} DNNExecBaseParams; typedef struct DNNExecClassificationParams {    DNNExecBaseParams base;    const char *target;} DNNExecClassificationParams; typedef int (*FramePrePostProc)(AVFrame *frame, DNNData *model, AVFilterContext *filter_ctx);typedef int (*DetectPostProc)(AVFrame *frame, DNNData *output, uint32_t nb, AVFilterContext *filter_ctx);typedef int (*ClassifyPostProc)(AVFrame *frame, DNNData *output, uint32_t bbox_index, AVFilterContext *filter_ctx); typedef struct DNNModel{    // Stores model that can be different for different backends.    void *model;    // Stores options when the model is executed by the backend    const char *options;    // Stores FilterContext used for the interaction between AVFrame and DNNData    AVFilterContext *filter_ctx;    // Stores function type of the model    DNNFunctionType func_type;    // Gets model input information    // Just reuse struct DNNData here, actually the DNNData.data field is not needed.    DNNReturnType (*get_input)(void *model, DNNData *input, const char *input_name);    // Gets model output width/height with given input w/h    DNNReturnType (*get_output)(void *model, const char *input_name, int input_width, int input_height,                                const char *output_name, int *output_width, int *output_height);    // set the pre process to transfer data from AVFrame to DNNData    // the default implementation within DNN is used if it is not provided by the filter    FramePrePostProc frame_pre_proc;    // set the post process to transfer data from DNNData to AVFrame    // the default implementation within DNN is used if it is not provided by the filter    FramePrePostProc frame_post_proc;    // set the post process to interpret detect result from DNNData    DetectPostProc detect_post_proc;    // set the post process to interpret classify result from DNNData    ClassifyPostProc classify_post_proc;} DNNModel; // Stores pointers to functions for loading, executing, freeing DNN models for one of the backends.typedef struct DNNModule{    // Loads model and parameters from given file. Returns NULL if it is not possible.    DNNModel *(*load_model)(const char *model_filename, DNNFunctionType func_type, const char *options, AVFilterContext *filter_ctx);    // Executes model with specified input and output. Returns DNN_ERROR otherwise.    DNNReturnType (*execute_model)(const DNNModel *model, DNNExecBaseParams *exec_params);    // Executes model with specified input and output asynchronously. Returns DNN_ERROR otherwise.    DNNReturnType (*execute_model_async)(const DNNModel *model, DNNExecBaseParams *exec_params);    // Retrieve inference result.    DNNAsyncStatusType (*get_async_result)(const DNNModel *model, AVFrame **in, AVFrame **out);    // Flush all the pending tasks.    DNNReturnType (*flush)(const DNNModel *model);    // Frees memory allocated for model.    void (*free_model)(DNNModel **model);} DNNModule; // Initializes DNNModule depending on chosen backend.DNNModule *ff_get_dnn_module(DNNBackendType backend_type); #endif