2014-03-15 16:42:15 +01:00
|
|
|
/*
|
2015-01-01 19:48:13 +01:00
|
|
|
* Copyright (C) 2003-2015 The Music Player Daemon Project
|
2014-03-15 16:42:15 +01:00
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#ifndef MPD_THREAD_INPUT_STREAM_HXX
|
|
|
|
#define MPD_THREAD_INPUT_STREAM_HXX
|
|
|
|
|
|
|
|
#include "check.h"
|
|
|
|
#include "InputStream.hxx"
|
|
|
|
#include "thread/Thread.hxx"
|
|
|
|
#include "thread/Cond.hxx"
|
|
|
|
#include "util/Error.hxx"
|
|
|
|
|
|
|
|
#include <stdint.h>
|
|
|
|
|
|
|
|
template<typename T> class CircularBuffer;
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Helper class for moving InputStream implementations with blocking
|
|
|
|
* backend library implementation to a dedicated thread. Data is
|
|
|
|
* being read into a ring buffer, and that buffer is then consumed by
|
|
|
|
* another thread using the regular #InputStream API. This class
|
|
|
|
* manages the thread and the buffer.
|
|
|
|
*
|
|
|
|
* This works only for "streams": unknown length, no seeking, no tags.
|
|
|
|
*/
|
2014-05-11 16:02:57 +02:00
|
|
|
class ThreadInputStream : public InputStream {
|
2014-05-11 18:25:55 +02:00
|
|
|
const char *const plugin;
|
|
|
|
|
2014-03-15 16:42:15 +01:00
|
|
|
Thread thread;
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Signalled when the thread shall be woken up: when data from
|
|
|
|
* the buffer has been consumed and when the stream shall be
|
|
|
|
* closed.
|
|
|
|
*/
|
|
|
|
Cond wake_cond;
|
|
|
|
|
|
|
|
Error postponed_error;
|
|
|
|
|
|
|
|
const size_t buffer_size;
|
|
|
|
CircularBuffer<uint8_t> *buffer;
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Shall the stream be closed?
|
|
|
|
*/
|
|
|
|
bool close;
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Has the end of the stream been seen by the thread?
|
|
|
|
*/
|
|
|
|
bool eof;
|
|
|
|
|
|
|
|
public:
|
2014-05-11 18:25:55 +02:00
|
|
|
ThreadInputStream(const char *_plugin,
|
2014-03-15 16:42:15 +01:00
|
|
|
const char *_uri, Mutex &_mutex, Cond &_cond,
|
|
|
|
size_t _buffer_size)
|
2014-05-11 18:25:55 +02:00
|
|
|
:InputStream(_uri, _mutex, _cond),
|
|
|
|
plugin(_plugin),
|
2014-03-15 16:42:15 +01:00
|
|
|
buffer_size(_buffer_size),
|
|
|
|
buffer(nullptr),
|
|
|
|
close(false), eof(false) {}
|
|
|
|
|
|
|
|
virtual ~ThreadInputStream();
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Initialize the object and start the thread.
|
|
|
|
*
|
|
|
|
* @return false on error
|
|
|
|
*/
|
|
|
|
InputStream *Start(Error &error);
|
|
|
|
|
2014-05-11 17:14:49 +02:00
|
|
|
/* virtual methods from InputStream */
|
|
|
|
bool Check(Error &error) override final;
|
|
|
|
bool IsEOF() override final;
|
|
|
|
bool IsAvailable() override final;
|
|
|
|
size_t Read(void *ptr, size_t size, Error &error) override final;
|
|
|
|
|
2014-03-15 16:42:15 +01:00
|
|
|
protected:
|
2014-05-11 16:02:57 +02:00
|
|
|
void SetMimeType(const char *_mime) {
|
2014-03-15 16:42:15 +01:00
|
|
|
assert(thread.IsInside());
|
|
|
|
|
2014-05-11 16:02:57 +02:00
|
|
|
InputStream::SetMimeType(_mime);
|
2014-03-15 16:42:15 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
/* to be implemented by the plugin */
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Optional initialization after entering the thread. After
|
|
|
|
* this returns with success, the InputStream::ready flag is
|
|
|
|
* set.
|
|
|
|
*
|
|
|
|
* The #InputStream is locked. Unlock/relock it if you do a
|
|
|
|
* blocking operation.
|
|
|
|
*/
|
|
|
|
virtual bool Open(gcc_unused Error &error) {
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Read from the stream.
|
|
|
|
*
|
|
|
|
* The #InputStream is not locked.
|
|
|
|
*
|
|
|
|
* @return 0 on end-of-file or on error
|
|
|
|
*/
|
2014-05-11 17:14:49 +02:00
|
|
|
virtual size_t ThreadRead(void *ptr, size_t size, Error &error) = 0;
|
2014-03-15 16:42:15 +01:00
|
|
|
|
|
|
|
/**
|
|
|
|
* Optional deinitialization before leaving the thread.
|
|
|
|
*
|
|
|
|
* The #InputStream is not locked.
|
|
|
|
*/
|
|
|
|
virtual void Close() {}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Called from the client thread to cancel a Read() inside the
|
|
|
|
* thread.
|
|
|
|
*
|
|
|
|
* The #InputStream is not locked.
|
|
|
|
*/
|
|
|
|
virtual void Cancel() {}
|
|
|
|
|
|
|
|
private:
|
|
|
|
void ThreadFunc();
|
|
|
|
static void ThreadFunc(void *ctx);
|
|
|
|
};
|
|
|
|
|
|
|
|
#endif
|