/*

* SPDX-FileCopyrightText: Copyright (c) 2019-2022 NVIDIA CORPORATION & AFFILIATES. All rights reserved.

* SPDX-License-Identifier: Apache-2.0

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

#include <gst/gst.h>

#include <glib.h>

#include <cstdlib>

#include <cstring>

#include <ctime>

#include <sys/timeb.h>

#include <functional>

#include <iostream>

#include "gstnvdsmeta.h"

#include "nvdsmeta_schema.h"

#include "utils.hpp"

/**

* Specifies the type of function to copy meta data.

* It is passed the pointer to meta data and user specific data.

* It allocates the required memory, copies the content from src metadata

* and returns the pointer to newly allocated memory.

*

* user_data is for internal purpose only. User should set it to NULL.

*/

using COPYFUNC_SIG = gpointer(gpointer, gpointer);

/**

* Specifies the type of function to free meta data.

* It is passed the pointer to meta data and user specific data.

* It should free any resource allocated for meta data.

*

* user_data is for internal purpose only. User should set it to NULL.

*/

using RELEASEFUNC_SIG = void(gpointer, gpointer);

namespace pydeepstream {

pybind11::arg operator ""_a(const char *str, size_t len) {

return pybind11::arg(str);

}

}

namespace pydeepstream::utils {

std::unordered_map<std::string, std::shared_ptr<char>> font_name_memory;

static const char copyfuncname[] = "copy_func"; // must be unique

static const char freefuncname[] = "free_func"; // must be unique

/// The returned pointer from get_fn_ptr_from_std_function is the same for all

/// instance templated on 'copy_func' string literal. Therefore it must only be

/// stored at one place. In case of multiple registration the latest stored

/// std::function will be the one called. The std::function 'func' is stored

/// statically.

void

set_copyfunc(NvDsUserMeta *meta,

std::function<COPYFUNC_SIG> const &func) {

// must be stored only at 1 place

meta->base_meta.copy_func = get_fn_ptr_from_std_function<copyfuncname>(func);

}

/// same as set_copyfunc

void set_freefunc(NvDsUserMeta *meta,

std::function<RELEASEFUNC_SIG> const &func) {

// must be stored only at 1 place

meta->base_meta.release_func = get_fn_ptr_from_std_function<freefuncname>(func);

}

void

__attribute__((optimize("O0")))

release_all_func() {

// these dummy functions are only used for their type to match the appropriate template

const auto dummy_copy_func = std::function<COPYFUNC_SIG>();

const auto dummy_free_func = std::function<RELEASEFUNC_SIG>();

// Here the functions must be freed because otherwise the destructor will be stuck with GIL

// this is related to pybind11 behavior.

// As far as I understand pybind11 does not expect us to store functions in a static storage

// it tries to acquire a lock inside its custom destructor of these functions, but the lock was

// destroyed before, thus creating a deadlock at program exit...

free_fn_ptr_from_std_function<copyfuncname>(dummy_copy_func);

free_fn_ptr_from_std_function<freefuncname>(dummy_free_func);

}

void generate_ts_rfc3339(char *buf, int buf_size) {

time_t tloc;

struct tm tm_log{};

struct timespec ts{};

char strmsec[6]; //.nnnZ\0

clock_gettime(CLOCK_REALTIME, &ts);

memcpy(&tloc, (void *) (&ts.tv_sec), sizeof(time_t));

gmtime_r(&tloc, &tm_log);

strftime(buf, buf_size, "%Y-%m-%dT%H:%M:%S", &tm_log);

int ms = ts.tv_nsec / 1000000;

g_snprintf(strmsec, sizeof(strmsec), ".%.3dZ", ms);

strncat(buf, strmsec, buf_size);

}

}