215 lines
3.9 KiB
C++
215 lines
3.9 KiB
C++
/*
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* Copyright (C) 2003-2014 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "InputStream.hxx"
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#include "Registry.hxx"
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#include "InputPlugin.hxx"
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#include "plugins/RewindInputPlugin.hxx"
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#include "util/UriUtil.hxx"
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#include "util/Error.hxx"
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#include "util/Domain.hxx"
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#include <assert.h>
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#include <stdio.h> /* for SEEK_SET */
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static constexpr Domain input_domain("input");
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InputStream *
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InputStream::Open(const char *url,
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Mutex &mutex, Cond &cond,
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Error &error)
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{
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input_plugins_for_each_enabled(plugin) {
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InputStream *is;
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is = plugin->open(url, mutex, cond, error);
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if (is != nullptr) {
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assert(is->plugin.close != nullptr);
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assert(is->plugin.read != nullptr);
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assert(is->plugin.eof != nullptr);
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assert(!is->seekable || is->plugin.seek != nullptr);
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is = input_rewind_open(is);
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return is;
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} else if (error.IsDefined())
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return nullptr;
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}
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error.Set(input_domain, "Unrecognized URI");
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return nullptr;
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}
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InputStream *
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InputStream::OpenReady(const char *uri,
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Mutex &mutex, Cond &cond,
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Error &error)
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{
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InputStream *is = Open(uri, mutex, cond, error);
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if (is == nullptr)
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return nullptr;
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mutex.lock();
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is->WaitReady();
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bool success = is->Check(error);
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mutex.unlock();
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if (!success) {
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is->Close();
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is = nullptr;
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}
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return is;
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}
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bool
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InputStream::Check(Error &error)
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{
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return plugin.check == nullptr || plugin.check(this, error);
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}
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void
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InputStream::Update()
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{
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if (plugin.update != nullptr)
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plugin.update(this);
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}
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void
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InputStream::WaitReady()
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{
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while (true) {
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Update();
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if (ready)
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break;
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cond.wait(mutex);
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}
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}
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void
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InputStream::LockWaitReady()
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{
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const ScopeLock protect(mutex);
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WaitReady();
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}
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bool
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InputStream::CheapSeeking() const
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{
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return IsSeekable() && !uri_has_scheme(uri.c_str());
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}
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bool
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InputStream::Seek(offset_type _offset, int whence, Error &error)
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{
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if (plugin.seek == nullptr)
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return false;
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return plugin.seek(this, _offset, whence, error);
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}
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bool
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InputStream::LockSeek(offset_type _offset, int whence, Error &error)
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{
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if (plugin.seek == nullptr)
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return false;
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const ScopeLock protect(mutex);
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return Seek(_offset, whence, error);
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}
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bool
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InputStream::Rewind(Error &error)
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{
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return Seek(0, SEEK_SET, error);
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}
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bool
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InputStream::LockRewind(Error &error)
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{
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return LockSeek(0, SEEK_SET, error);
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}
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Tag *
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InputStream::ReadTag()
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{
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return plugin.tag != nullptr
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? plugin.tag(this)
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: nullptr;
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}
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Tag *
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InputStream::LockReadTag()
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{
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if (plugin.tag == nullptr)
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return nullptr;
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const ScopeLock protect(mutex);
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return ReadTag();
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}
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bool
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InputStream::IsAvailable()
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{
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return plugin.available != nullptr
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? plugin.available(this)
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: true;
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}
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size_t
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InputStream::Read(void *ptr, size_t _size, Error &error)
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{
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assert(ptr != nullptr);
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assert(_size > 0);
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return plugin.read(this, ptr, _size, error);
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}
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size_t
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InputStream::LockRead(void *ptr, size_t _size, Error &error)
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{
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assert(ptr != nullptr);
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assert(_size > 0);
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const ScopeLock protect(mutex);
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return Read(ptr, _size, error);
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}
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void
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InputStream::Close()
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{
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plugin.close(this);
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}
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bool
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InputStream::IsEOF()
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{
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return plugin.eof(this);
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}
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bool
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InputStream::LockIsEOF()
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{
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const ScopeLock protect(mutex);
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return IsEOF();
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}
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