mirror of https://git.ffmpeg.org/ffmpeg.git
351 lines
13 KiB
C
351 lines
13 KiB
C
/*
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* Copyright (c) 2018 Sergey Lavrushkin
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* DNN native backend implementation.
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*/
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#include "dnn_backend_native.h"
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static DNNReturnType set_input_output_native(void *model, DNNData *input, DNNData *output)
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{
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ConvolutionalNetwork *network = (ConvolutionalNetwork *)model;
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InputParams *input_params;
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ConvolutionalParams *conv_params;
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DepthToSpaceParams *depth_to_space_params;
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int cur_width, cur_height, cur_channels;
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int32_t layer;
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if (network->layers_num <= 0 || network->layers[0].type != INPUT){
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return DNN_ERROR;
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}
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else{
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input_params = (InputParams *)network->layers[0].params;
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input_params->width = cur_width = input->width;
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input_params->height = cur_height = input->height;
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input_params->channels = cur_channels = input->channels;
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if (input->data){
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av_freep(&input->data);
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}
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network->layers[0].output = input->data = av_malloc(cur_height * cur_width * cur_channels * sizeof(float));
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if (!network->layers[0].output){
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return DNN_ERROR;
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}
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}
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for (layer = 1; layer < network->layers_num; ++layer){
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switch (network->layers[layer].type){
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case CONV:
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conv_params = (ConvolutionalParams *)network->layers[layer].params;
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if (conv_params->input_num != cur_channels){
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return DNN_ERROR;
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}
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cur_channels = conv_params->output_num;
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break;
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case DEPTH_TO_SPACE:
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depth_to_space_params = (DepthToSpaceParams *)network->layers[layer].params;
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if (cur_channels % (depth_to_space_params->block_size * depth_to_space_params->block_size) != 0){
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return DNN_ERROR;
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}
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cur_channels = cur_channels / (depth_to_space_params->block_size * depth_to_space_params->block_size);
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cur_height *= depth_to_space_params->block_size;
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cur_width *= depth_to_space_params->block_size;
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break;
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default:
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return DNN_ERROR;
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}
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if (network->layers[layer].output){
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av_freep(&network->layers[layer].output);
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}
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network->layers[layer].output = av_malloc(cur_height * cur_width * cur_channels * sizeof(float));
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if (!network->layers[layer].output){
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return DNN_ERROR;
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}
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}
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output->data = network->layers[network->layers_num - 1].output;
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output->height = cur_height;
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output->width = cur_width;
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output->channels = cur_channels;
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return DNN_SUCCESS;
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}
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// Loads model and its parameters that are stored in a binary file with following structure:
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// layers_num,layer_type,layer_parameterss,layer_type,layer_parameters...
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// For CONV layer: activation_function, input_num, output_num, kernel_size, kernel, biases
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// For DEPTH_TO_SPACE layer: block_size
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DNNModel *ff_dnn_load_model_native(const char *model_filename)
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{
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DNNModel *model = NULL;
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ConvolutionalNetwork *network = NULL;
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AVIOContext *model_file_context;
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int file_size, dnn_size, kernel_size, i;
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int32_t layer;
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DNNLayerType layer_type;
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ConvolutionalParams *conv_params;
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DepthToSpaceParams *depth_to_space_params;
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model = av_malloc(sizeof(DNNModel));
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if (!model){
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return NULL;
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}
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if (avio_open(&model_file_context, model_filename, AVIO_FLAG_READ) < 0){
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av_freep(&model);
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return NULL;
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}
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file_size = avio_size(model_file_context);
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network = av_malloc(sizeof(ConvolutionalNetwork));
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if (!network){
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avio_closep(&model_file_context);
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av_freep(&model);
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return NULL;
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}
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model->model = (void *)network;
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network->layers_num = 1 + (int32_t)avio_rl32(model_file_context);
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dnn_size = 4;
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network->layers = av_malloc(network->layers_num * sizeof(Layer));
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if (!network->layers){
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av_freep(&network);
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avio_closep(&model_file_context);
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av_freep(&model);
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return NULL;
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}
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for (layer = 0; layer < network->layers_num; ++layer){
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network->layers[layer].output = NULL;
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network->layers[layer].params = NULL;
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}
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network->layers[0].type = INPUT;
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network->layers[0].params = av_malloc(sizeof(InputParams));
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if (!network->layers[0].params){
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avio_closep(&model_file_context);
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ff_dnn_free_model_native(&model);
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return NULL;
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}
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for (layer = 1; layer < network->layers_num; ++layer){
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layer_type = (int32_t)avio_rl32(model_file_context);
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dnn_size += 4;
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switch (layer_type){
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case CONV:
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conv_params = av_malloc(sizeof(ConvolutionalParams));
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if (!conv_params){
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avio_closep(&model_file_context);
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ff_dnn_free_model_native(&model);
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return NULL;
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}
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conv_params->activation = (int32_t)avio_rl32(model_file_context);
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conv_params->input_num = (int32_t)avio_rl32(model_file_context);
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conv_params->output_num = (int32_t)avio_rl32(model_file_context);
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conv_params->kernel_size = (int32_t)avio_rl32(model_file_context);
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kernel_size = conv_params->input_num * conv_params->output_num *
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conv_params->kernel_size * conv_params->kernel_size;
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dnn_size += 16 + (kernel_size + conv_params->output_num << 2);
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if (dnn_size > file_size || conv_params->input_num <= 0 ||
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conv_params->output_num <= 0 || conv_params->kernel_size <= 0){
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avio_closep(&model_file_context);
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ff_dnn_free_model_native(&model);
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return NULL;
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}
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conv_params->kernel = av_malloc(kernel_size * sizeof(float));
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conv_params->biases = av_malloc(conv_params->output_num * sizeof(float));
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if (!conv_params->kernel || !conv_params->biases){
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avio_closep(&model_file_context);
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ff_dnn_free_model_native(&model);
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return NULL;
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}
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for (i = 0; i < kernel_size; ++i){
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conv_params->kernel[i] = av_int2float(avio_rl32(model_file_context));
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}
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for (i = 0; i < conv_params->output_num; ++i){
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conv_params->biases[i] = av_int2float(avio_rl32(model_file_context));
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}
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network->layers[layer].type = CONV;
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network->layers[layer].params = conv_params;
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break;
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case DEPTH_TO_SPACE:
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depth_to_space_params = av_malloc(sizeof(DepthToSpaceParams));
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if (!depth_to_space_params){
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avio_closep(&model_file_context);
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ff_dnn_free_model_native(&model);
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return NULL;
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}
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depth_to_space_params->block_size = (int32_t)avio_rl32(model_file_context);
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dnn_size += 4;
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network->layers[layer].type = DEPTH_TO_SPACE;
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network->layers[layer].params = depth_to_space_params;
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break;
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default:
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avio_closep(&model_file_context);
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ff_dnn_free_model_native(&model);
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return NULL;
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}
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}
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avio_closep(&model_file_context);
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if (dnn_size != file_size){
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ff_dnn_free_model_native(&model);
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return NULL;
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}
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model->set_input_output = &set_input_output_native;
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return model;
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}
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#define CLAMP_TO_EDGE(x, w) ((x) < 0 ? 0 : ((x) >= (w) ? (w - 1) : (x)))
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static void convolve(const float *input, float *output, const ConvolutionalParams *conv_params, int width, int height)
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{
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int y, x, n_filter, ch, kernel_y, kernel_x;
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int radius = conv_params->kernel_size >> 1;
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int src_linesize = width * conv_params->input_num;
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int filter_linesize = conv_params->kernel_size * conv_params->input_num;
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int filter_size = conv_params->kernel_size * filter_linesize;
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for (y = 0; y < height; ++y){
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for (x = 0; x < width; ++x){
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for (n_filter = 0; n_filter < conv_params->output_num; ++n_filter){
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output[n_filter] = conv_params->biases[n_filter];
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for (ch = 0; ch < conv_params->input_num; ++ch){
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for (kernel_y = 0; kernel_y < conv_params->kernel_size; ++kernel_y){
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for (kernel_x = 0; kernel_x < conv_params->kernel_size; ++kernel_x){
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output[n_filter] += input[CLAMP_TO_EDGE(y + kernel_y - radius, height) * src_linesize +
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CLAMP_TO_EDGE(x + kernel_x - radius, width) * conv_params->input_num + ch] *
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conv_params->kernel[n_filter * filter_size + kernel_y * filter_linesize +
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kernel_x * conv_params->input_num + ch];
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}
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}
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}
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switch (conv_params->activation){
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case RELU:
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output[n_filter] = FFMAX(output[n_filter], 0.0);
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break;
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case TANH:
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output[n_filter] = 2.0f / (1.0f + exp(-2.0f * output[n_filter])) - 1.0f;
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break;
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case SIGMOID:
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output[n_filter] = 1.0f / (1.0f + exp(-output[n_filter]));
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}
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}
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output += conv_params->output_num;
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}
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}
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}
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static void depth_to_space(const float *input, float *output, int block_size, int width, int height, int channels)
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{
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int y, x, by, bx, ch;
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int new_channels = channels / (block_size * block_size);
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int output_linesize = width * channels;
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int by_linesize = output_linesize / block_size;
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int x_linesize = new_channels * block_size;
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for (y = 0; y < height; ++y){
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for (x = 0; x < width; ++x){
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for (by = 0; by < block_size; ++by){
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for (bx = 0; bx < block_size; ++bx){
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for (ch = 0; ch < new_channels; ++ch){
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output[by * by_linesize + x * x_linesize + bx * new_channels + ch] = input[ch];
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}
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input += new_channels;
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}
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}
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}
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output += output_linesize;
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}
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}
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DNNReturnType ff_dnn_execute_model_native(const DNNModel *model)
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{
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ConvolutionalNetwork *network = (ConvolutionalNetwork *)model->model;
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int cur_width, cur_height, cur_channels;
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int32_t layer;
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InputParams *input_params;
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ConvolutionalParams *conv_params;
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DepthToSpaceParams *depth_to_space_params;
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if (network->layers_num <= 0 || network->layers[0].type != INPUT || !network->layers[0].output){
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return DNN_ERROR;
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}
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else{
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input_params = (InputParams *)network->layers[0].params;
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cur_width = input_params->width;
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cur_height = input_params->height;
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cur_channels = input_params->channels;
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}
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for (layer = 1; layer < network->layers_num; ++layer){
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if (!network->layers[layer].output){
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return DNN_ERROR;
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}
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switch (network->layers[layer].type){
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case CONV:
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conv_params = (ConvolutionalParams *)network->layers[layer].params;
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convolve(network->layers[layer - 1].output, network->layers[layer].output, conv_params, cur_width, cur_height);
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cur_channels = conv_params->output_num;
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break;
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case DEPTH_TO_SPACE:
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depth_to_space_params = (DepthToSpaceParams *)network->layers[layer].params;
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depth_to_space(network->layers[layer - 1].output, network->layers[layer].output,
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depth_to_space_params->block_size, cur_width, cur_height, cur_channels);
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cur_height *= depth_to_space_params->block_size;
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cur_width *= depth_to_space_params->block_size;
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cur_channels /= depth_to_space_params->block_size * depth_to_space_params->block_size;
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break;
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case INPUT:
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return DNN_ERROR;
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}
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}
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return DNN_SUCCESS;
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}
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void ff_dnn_free_model_native(DNNModel **model)
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{
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ConvolutionalNetwork *network;
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ConvolutionalParams *conv_params;
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int32_t layer;
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if (*model)
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{
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network = (ConvolutionalNetwork *)(*model)->model;
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for (layer = 0; layer < network->layers_num; ++layer){
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av_freep(&network->layers[layer].output);
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if (network->layers[layer].type == CONV){
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conv_params = (ConvolutionalParams *)network->layers[layer].params;
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av_freep(&conv_params->kernel);
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av_freep(&conv_params->biases);
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}
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av_freep(&network->layers[layer].params);
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}
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av_freep(&network->layers);
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av_freep(&network);
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av_freep(model);
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}
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}
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