IcyInputStream.cxx 2.52 KB
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/*
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 * Copyright 2003-2018 The Music Player Daemon Project
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 * http://www.musicpd.org
 *
 * 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 "IcyInputStream.hxx"
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#include "IcyMetaDataParser.hxx"
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#include "tag/Tag.hxx"

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IcyInputStream::IcyInputStream(InputStreamPtr _input,
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			       std::shared_ptr<IcyMetaDataParser> _parser) noexcept
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	:ProxyInputStream(std::move(_input)), parser(std::move(_parser))
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{
}

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IcyInputStream::~IcyInputStream() noexcept = default;
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inline bool
IcyInputStream::IsEnabled() const noexcept
{
	assert(parser);

	return parser->IsDefined();
}

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void
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IcyInputStream::Update() noexcept
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{
	ProxyInputStream::Update();

	if (IsEnabled())
		offset = override_offset;
}

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std::unique_ptr<Tag>
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IcyInputStream::ReadTag() noexcept
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{
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	auto new_input_tag = ProxyInputStream::ReadTag();
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	if (!IsEnabled())
		return new_input_tag;

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	const bool had_new_input_tag = !!new_input_tag;
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	if (new_input_tag != nullptr)
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		input_tag = std::move(new_input_tag);
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	auto new_icy_tag = parser->ReadTag();
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	const bool had_new_icy_tag = !!new_icy_tag;
	if (new_icy_tag != nullptr)
		icy_tag = std::move(new_icy_tag);
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	if (!had_new_input_tag && !had_new_icy_tag)
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		/* no change */
		return nullptr;

	if (input_tag == nullptr && icy_tag == nullptr)
		/* no tag */
		return nullptr;

	if (input_tag == nullptr)
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		return std::make_unique<Tag>(*icy_tag);
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	if (icy_tag == nullptr)
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		return std::make_unique<Tag>(*input_tag);
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	return Tag::Merge(*input_tag, *icy_tag);
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}

size_t
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IcyInputStream::Read(std::unique_lock<Mutex> &lock,
		     void *ptr, size_t read_size)
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{
	if (!IsEnabled())
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		return ProxyInputStream::Read(lock, ptr, read_size);
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	while (true) {
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		size_t nbytes = ProxyInputStream::Read(lock, ptr, read_size);
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		if (nbytes == 0)
			return 0;

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		size_t result = parser->ParseInPlace(ptr, nbytes);
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		if (result > 0) {
			override_offset += result;
			offset = override_offset;
			return result;
		}
	}
}