obs-StreamFX/source/obs/obs-tools.cpp

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/*
* Modern effects for a modern Streamer
* Copyright (C) 2018 Michael Fabian Dirks
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "obs-tools.hpp"
#include <map>
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#include <stdexcept>
#include "plugin.hpp"
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struct scs_searchdata {
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obs_source_t* source;
bool found = false;
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std::map<obs_source_t*, bool> visited;
};
static bool scs_contains(scs_searchdata& sd, obs_source_t* source);
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static void scs_enum_active_cb(obs_source_t*, obs_source_t* child, void* searchdata) noexcept
try {
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scs_searchdata& sd = reinterpret_cast<scs_searchdata&>(*reinterpret_cast<scs_searchdata*>(searchdata));
scs_contains(sd, child);
} catch (...) {
DLOG_ERROR("Unexpected exception in function '%s'.", __FUNCTION_NAME__);
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}
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static bool scs_enum_items_cb(obs_scene_t*, obs_sceneitem_t* item, void* searchdata) noexcept
try {
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scs_searchdata& sd = reinterpret_cast<scs_searchdata&>(*reinterpret_cast<scs_searchdata*>(searchdata));
obs_source_t* source = obs_sceneitem_get_source(item);
return scs_contains(sd, source);
} catch (...) {
DLOG_ERROR("Unexpected exception in function '%s'.", __FUNCTION_NAME__);
return false;
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}
static bool scs_contains(scs_searchdata& sd, obs_source_t* source)
{
if (sd.visited.find(source) != sd.visited.end()) {
return false;
} else {
sd.visited.insert({source, true});
}
if (source == sd.source) {
sd.found = true;
return true;
} else {
if (strcmp(obs_source_get_id(source), "scene")) {
obs_scene_t* nscene = obs_scene_from_source(source);
obs_scene_enum_items(nscene, scs_enum_items_cb, &sd);
} else {
obs_source_enum_active_sources(source, scs_enum_active_cb, &sd);
}
}
if (sd.found) {
return false;
}
return true;
}
bool obs::tools::scene_contains_source(obs_scene_t* scene, obs_source_t* source)
{
scs_searchdata sd;
sd.source = source;
obs_scene_enum_items(scene, scs_enum_items_cb, &sd);
return sd.found;
}
extern "C" {
struct _hack_obs_properties;
struct _hack_obs_property {
char* name;
char* desc;
char* long_desc;
void* priv;
enum obs_property_type type;
bool visible;
bool enabled;
struct _hack_obs_properties* parent;
obs_property_modified_t modified;
obs_property_modified2_t modified2;
struct _hack_obs_property* next;
};
struct _hack_obs_properties {
void* param;
void (*destroy)(void* param);
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std::uint32_t flags;
struct _hack_obs_property* first_property;
struct _hack_obs_property** last;
struct _hack_obs_property* parent;
};
}
bool obs::tools::obs_properties_remove_by_name(obs_properties_t* props, const char* name)
{
// Due to a bug in obs_properties_remove_by_name, calling it on the first or last element of a group corrupts the
// obs_properties_t's first and last pointers, which now point at nonsense.
//
// There are two ways to work around this issue for now:
// 1. Add some invisible properties to the beginning and end of the list, ensuring that you never hit the first or
// last element with a obs_properties_remove_by_name.
// 2. Manually adjust the pointers using a dirty hack like in gs::mipmapper.
// I've opted for the 2nd way, at it is way simpler to implement.
// Assume that this is fixed in libobs 24.0.7 or newer.
if (obs_get_version() >= MAKE_SEMANTIC_VERSION(24, 0, 7)) {
::obs_properties_remove_by_name(props, name);
return true;
}
auto rprops = reinterpret_cast<_hack_obs_properties*>(props);
for (_hack_obs_property *el_prev = rprops->first_property, *el_cur = el_prev; el_cur != nullptr;
el_prev = el_cur, el_cur = el_cur->next) {
if (strcmp(el_cur->name, name) == 0) {
// Store some information.
_hack_obs_property* next = el_cur->next;
bool is_first = (rprops->first_property == el_cur);
bool is_last = (rprops->last == &el_cur->next);
bool is_solo = (el_cur == el_prev);
// Call the real one which fixes the element pointer and deallocates the element.
::obs_properties_remove_by_name(props, name);
// Fix up the memory pointers after the element was deleted.
if (is_last) {
if (is_solo) {
rprops->last = &rprops->first_property;
} else {
rprops->last = &el_prev->next;
}
}
if (is_first) {
rprops->first_property = next;
}
// Finally break out as we no longer have to process the properties list.
return true;
}
if (el_cur->type == OBS_PROPERTY_GROUP) {
if (obs::tools::obs_properties_remove_by_name(
obs_property_group_content(reinterpret_cast<obs_property_t*>(el_cur)), name))
return true;
}
}
return false;
}
obs::tools::child_source::child_source(obs_source_t* parent, std::shared_ptr<obs_source_t> child)
: _parent(parent), _child(child)
{
if (!obs_source_add_active_child(_parent, _child.get())) {
throw std::runtime_error("recursion detected");
}
}
obs::tools::child_source::~child_source()
{
obs_source_remove_active_child(_parent, _child.get());
}
std::shared_ptr<obs_source_t> obs::tools::child_source::get()
{
return _child;
}