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/*
* Copyright (C) 2015 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* 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, see <http://www.gnu.org/licenses/>.
*
* Authored by: James Henstridge <james.henstridge@canonical.com>
*/
#include "supports_decoder.h"
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wold-style-cast"
#pragma GCC diagnostic ignored "-Wcast-qual"
#pragma GCC diagnostic ignored "-Wcast-align"
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wparentheses-equality"
#endif
#include <gst/gst.h>
#ifdef __clang__
#pragma clang diagnostic pop
#endif
#pragma GCC diagnostic pop
#include <memory>
#include <set>
bool supports_decoder(const std::string& format)
{
static std::set<std::string> formats;
if (formats.empty())
{
std::unique_ptr<GList, decltype(&gst_plugin_feature_list_free)> decoders(
gst_element_factory_list_get_elements(GST_ELEMENT_FACTORY_TYPE_DECODER, GST_RANK_NONE),
gst_plugin_feature_list_free);
for (const GList* l = decoders.get(); l != nullptr; l = l->next)
{
const auto factory = static_cast<GstElementFactory*>(l->data);
const GList* templates = gst_element_factory_get_static_pad_templates(factory);
for (const GList* l = templates; l != nullptr; l = l->next)
{
const auto t = static_cast<GstStaticPadTemplate*>(l->data);
if (t->direction != GST_PAD_SINK)
{
continue;
}
std::unique_ptr<GstCaps, decltype(&gst_caps_unref)> caps(gst_static_caps_get(&t->static_caps),
gst_caps_unref);
for (unsigned int i = 0; i < gst_caps_get_size(caps.get()); i++)
{
const auto structure = gst_caps_get_structure(caps.get(), i);
formats.emplace(gst_structure_get_name(structure));
}
}
}
}
return formats.find(format) != formats.end();
}
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