video_capture_params.cpp

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/*
 * Copyright (c) 2013-2023 CESNET z.s.p.o.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted provided that the following conditions
 * are met:
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 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
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 *    used to endorse or promote products derived from this software without
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 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
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 * EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#include "config_unix.h"
#include "config_win32.h"
#endif
 
#include <string>
 
#include "utils/config_file.h"
#include "video_capture_params.h"
 
using namespace std;
 
struct vidcap_params {
        char  *driver; 
        char  *fmt;    
        unsigned int flags;  
 
        char *requested_capture_filter;
        char  *name;   
        struct vidcap_params *next; 
        struct module *parent;
};
 
static bool vidcap_dispatch_alias(struct vidcap_params *params)
{
        bool ret;
        char buf[1024];
        string real_capture;
        struct config_file *conf =
                config_file_open(default_config_file(buf,
                                        sizeof(buf)));
        if (conf == NULL)
                return false;
        real_capture = config_file_get_alias(conf, "capture", params->name);
        if (real_capture.empty()) {
                ret = false;
        } else {
                params->driver = strdup(real_capture.c_str());
                if (strchr(params->driver, ':')) {
                        char *delim = strchr(params->driver, ':');
                        params->fmt = strdup(delim + 1);
                        *delim = '\0';
                } else {
                        params->fmt = strdup("");
                }
                ret = true;
        }
 
 
        if (params->requested_capture_filter == NULL) {
                string matched_cap_filter = config_file_get_capture_filter_for_alias(conf,
                                        params->name);
                if (!matched_cap_filter.empty())
                        params->requested_capture_filter = strdup(matched_cap_filter.c_str());
        }
 
        config_file_close(conf);
 
        return ret;
}
 
 
struct vidcap_params *vidcap_params_allocate(void)
{
        return (struct vidcap_params *) calloc(1, sizeof(struct vidcap_params));
}
 
struct vidcap_params *vidcap_params_allocate_next(struct vidcap_params *curr)
{
        curr->next = vidcap_params_allocate();
        return curr->next;
}
 
struct vidcap_params *vidcap_params_get_next(const struct vidcap_params *curr)
{
        return curr->next;
}
 
struct vidcap_params *vidcap_params_get_nth(struct vidcap_params *curr, int index)
{
        struct vidcap_params *ret = curr;
        for (int i = 0; i < index; i++) {
                ret = ret->next;
                if (ret == NULL) {
                        return NULL;
                }
        }
        if (ret->driver == NULL) {
                // this is just the stopper of the list...
                return NULL;
        }
        return ret;
}
 
void vidcap_params_set_device(struct vidcap_params *params, const char *config)
{
        free(params->name);
        free(params->driver);
        free(params->fmt);
 
        params->name = strdup(config);
 
        if (!vidcap_dispatch_alias(params)) {
                params->driver = strdup(config);
                if (strchr(params->driver, ':')) {
                        char *delim = strchr(params->driver, ':');
                        *delim = '\0';
                        params->fmt = strdup(delim + 1);
                } else {
                        params->fmt = strdup("");
                }
        }
}
 
void vidcap_params_set_driver(struct vidcap_params *params, const char *driver)
{
        free(params->driver);
        params->driver = strdup(driver);
}
 
void vidcap_params_set_capture_filter(struct vidcap_params *params,
                const char *req_capture_filter)
{
        params->requested_capture_filter = strdup(req_capture_filter);
}
 
const char *vidcap_params_get_capture_filter(const struct vidcap_params *params)
{
        return params->requested_capture_filter;
}
 
void vidcap_params_set_flags(struct vidcap_params *params, unsigned int flags)
{
        params->flags = flags;
}
 
void vidcap_params_add_flags(struct vidcap_params *params, unsigned int flags)
{
        params->flags |= flags;
}
 
const char *vidcap_params_get_driver(const struct vidcap_params *params)
{
        return params->driver;
}
 
const char *vidcap_params_get_fmt(const struct vidcap_params *params)
{
        return params->fmt;
}
 
unsigned int vidcap_params_get_flags(const struct vidcap_params *params)
{
        return params->flags;
}
 
const char *vidcap_params_get_name(const struct vidcap_params *params)
{
        return params->name;
}
 
struct module *vidcap_params_get_parent(const struct vidcap_params *params)
{
        return params->parent;
}
 
void vidcap_params_set_parent(struct vidcap_params *params, struct module *mod){
       params->parent = mod;
}
 
struct vidcap_params *vidcap_params_copy(const struct vidcap_params *params)
{
        if (!params)
                return NULL;
 
        struct vidcap_params *ret = (struct vidcap_params *) calloc(1, sizeof(struct vidcap_params));
 
        if (params->driver)
                ret->driver = strdup(params->driver);
        if (params->fmt)
                ret->fmt = strdup(params->fmt);
        if (params->requested_capture_filter)
                ret->requested_capture_filter =
                        strdup(params->requested_capture_filter);
        if (params->name)
                ret->name = strdup(params->name);
        if (params->flags)
                ret->flags = params->flags;
 
        ret->next = NULL; // there is high probability that the pointer will be invalid
 
        return ret;
}
 
void vidcap_params_free_struct(struct vidcap_params *buf)
{
        if (!buf)
                return;
 
        free(buf->driver);
        free(buf->fmt);
        free(buf->requested_capture_filter);
        free(buf->name);
 
        free(buf);
}