mirror of
https://github.com/outbackdingo/UltraGrid.git
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230 lines
8.8 KiB
C++
230 lines
8.8 KiB
C++
/**
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* @file capture_filter.cpp
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* @author Martin Pulec <pulec@cesnet.cz>
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*/
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/*
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* Copyright (c) 2014-2020 CESNET, z. s. p. o.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, is permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of CESNET nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#include "config_unix.h"
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#include "config_win32.h"
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#endif /* HAVE_CONFIG_H */
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#include "capture_filter.h"
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#include "debug.h"
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#include "lib_common.h"
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#include "module.h"
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#include "utils/color_out.h"
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#include "utils/list.h"
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#include "video.h"
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using namespace std;
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struct capture_filter {
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struct module mod;
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struct simple_linked_list *filters;
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};
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struct capture_filter_instance {
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const struct capture_filter_info *functions;
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void *state;
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};
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static int create_filter(struct capture_filter *s, char *cfg)
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{
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bool found = false;
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char *options = NULL;
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char *filter_name = cfg;
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if(strchr(filter_name, ':')) {
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options = strchr(filter_name, ':') + 1;
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*strchr(filter_name, ':') = '\0';
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}
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const auto & capture_filters = get_libraries_for_class(LIBRARY_CLASS_CAPTURE_FILTER, CAPTURE_FILTER_ABI_VERSION);
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for (auto && item : capture_filters) {
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auto capture_filter_info = static_cast<const struct capture_filter_info*>(item.second);
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if(strcasecmp(item.first.c_str(), filter_name) == 0) {
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struct capture_filter_instance *instance = (struct capture_filter_instance *)
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malloc(sizeof(struct capture_filter_instance));
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instance->functions = capture_filter_info;
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int ret = capture_filter_info->init(&s->mod, options, &instance->state);
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if(ret < 0) {
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fprintf(stderr, "Unable to initialize capture filter: %s\n",
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filter_name);
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}
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if(ret != 0) {
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free(instance);
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return ret;
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}
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simple_linked_list_append(s->filters, instance);
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found = true;
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break;
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}
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}
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if (!found) {
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fprintf(stderr, "Unable to find capture filter: %s\n",
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filter_name);
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return -1;
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}
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return 0;
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}
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int capture_filter_init(struct module *parent, const char *cfg, struct capture_filter **state)
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{
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if (cfg && (strcasecmp(cfg, "help") == 0 || strcasecmp(cfg, "fullhelp") == 0)) {
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printf("Usage:\n");
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color_out(COLOR_OUT_BOLD, "\t--capture-filter <filter1>[:opts][,<filter2>[:opts][,<filter3>[:<opts>]]]");
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printf(" -t <capture>\n\n");
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printf("Available capture filters:\n");
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list_modules(LIBRARY_CLASS_CAPTURE_FILTER, CAPTURE_FILTER_ABI_VERSION, strcasecmp(cfg, "fullhelp") == 0);
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return 1;
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}
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struct capture_filter *s = (struct capture_filter *) calloc(1, sizeof(struct capture_filter));
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char *item, *save_ptr;
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assert(s);
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char *filter_list_str = NULL,
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*tmp = NULL;
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s->filters = simple_linked_list_init();
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module_init_default(&s->mod);
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s->mod.cls = MODULE_CLASS_FILTER;
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module_register(&s->mod, parent);
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if(cfg) {
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filter_list_str = tmp = strdup(cfg);
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while((item = strtok_r(filter_list_str, ",", &save_ptr))) {
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char filter_name[128];
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strncpy(filter_name, item, sizeof filter_name - 1);
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int ret = create_filter(s, filter_name);
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if (ret != 0) {
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module_done(&s->mod);
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free(tmp);
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free(s);
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return ret;
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}
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filter_list_str = NULL;
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}
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}
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free(tmp);
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*state = s;
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return 0;
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}
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void capture_filter_destroy(struct capture_filter *state)
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{
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struct capture_filter *s = state;
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while(simple_linked_list_size(s->filters) > 0) {
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struct capture_filter_instance *inst = (struct capture_filter_instance *) simple_linked_list_pop(s->filters);
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inst->functions->done(inst->state);
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free(inst);
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}
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simple_linked_list_destroy(s->filters);
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module_done(&s->mod);
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free(state);
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}
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static struct response *process_message(struct capture_filter *s, struct msg_universal *msg)
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{
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if (strncmp("delete ", msg->text, strlen("delete ")) == 0) {
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int index = atoi(msg->text + strlen("delete "));
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struct capture_filter_instance *inst = (struct capture_filter_instance *)
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simple_linked_list_remove_index(s->filters, index);
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if (!inst) {
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fprintf(stderr, "Unable to remove capture filter index %d.\n",
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index);
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return new_response(RESPONSE_INT_SERV_ERR, NULL);
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} else {
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printf("Capture filter #%d removed successfully.\n", index);
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inst->functions->done(inst->state);
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free(inst);
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}
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} else if (strcmp("flush", msg->text) == 0) {
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while(simple_linked_list_size(s->filters) > 0) {
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struct capture_filter_instance *inst = (struct capture_filter_instance *) simple_linked_list_pop(s->filters);
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inst->functions->done(inst->state);
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free(inst);
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}
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} else if (strcmp("help", msg->text) == 0) {
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printf("Capture filter control:\n"
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"\tflush - remove all filters\n"
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"\tdelete <x> - delete x-th filter\n"
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"\t<filter> - append a filter named <filter>\n");
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} else {
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char *fmt = strdup(msg->text);
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if (create_filter(s, fmt) != 0) {
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fprintf(stderr, "Cannot create capture filter: %s.\n",
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msg->text);
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free(fmt);
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return new_response(RESPONSE_INT_SERV_ERR, NULL);
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} else {
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printf("Capture filter \"%s\" created successfully.\n",
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msg->text);
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}
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free(fmt);
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}
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return new_response(RESPONSE_OK, NULL);
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}
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struct video_frame *capture_filter(struct capture_filter *state, struct video_frame *frame) {
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struct capture_filter *s = state;
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struct message *msg;
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while ((msg = check_message(&s->mod))) {
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struct response *r = process_message(s, (struct msg_universal *) msg);
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free_message(msg, r);
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}
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for(void *it = simple_linked_list_it_init(s->filters);
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it != NULL;
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) {
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struct capture_filter_instance *inst = (struct capture_filter_instance *) simple_linked_list_it_next(&it);
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frame = inst->functions->filter(inst->state, frame);
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if(!frame)
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return NULL;
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}
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return frame;
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}
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