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/*
Copyright (C) 2001 Stefan Westerfeld
stefan@space.twc.de
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include "kmedia2.h"
#include "stdsynthmodule.h"
#include "debug.h"
#include <unistd.h>
#include <sys/mman.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <iostream>
#include <cstring>
using namespace std;
using namespace Arts;
namespace Arts {
class FileInputStream_impl : virtual public FileInputStream_skel,
virtual public StdSynthModule
{
protected:
string _filename;
int age, fd;
unsigned int _size, position;
mcopbyte *data;
queue< DataPacket<mcopbyte>* > wqueue;
public:
static const unsigned int PACKET_COUNT;
static const unsigned int PACKET_SIZE;
FileInputStream_impl()
{
fd = -1;
position = 0;
data = 0;
age = 0;
_size = 0;
}
~FileInputStream_impl()
{
arts_assert(wqueue.size() == 0);
close();
}
void close()
{
if(data != 0)
{
munmap((char*)data, _size);
data = 0;
}
if(fd >= 0)
{
::close(fd);
fd = -1;
}
}
bool open(const string& filename)
{
close();
fd = ::open(filename.c_str(), O_RDONLY);
if(fd < 0)
return false;
_size = lseek(fd, 0, SEEK_END);
lseek(fd, 0, SEEK_SET);
data = (mcopbyte *)mmap(0, _size, PROT_READ, MAP_SHARED, fd, 0);
if(data == 0)
{
close();
return false;
}
position = 0;
if(_filename != filename)
{
_filename = filename;
filename_changed(filename);
}
return true;
}
string filename() { return _filename; }
void filename(const string& newfilename) { open(newfilename); }
long size() { return _size; }
bool eof()
{
return (fd < 0 || position >= _size)
&& (wqueue.size() == PACKET_COUNT);
}
bool seekOk() { return true; }
long seek(long newPosition)
{
arts_return_val_if_fail(fd < 0, -1);
arts_return_val_if_fail(newPosition < 0, -1);
arts_return_val_if_fail(newPosition > (long)_size, -1);
long ageBeforeSeek = age;
position = newPosition;
processQueue();
return ageBeforeSeek;
}
void processQueue()
{
unsigned int qsize = wqueue.size();
for(unsigned int i = 0; i < qsize; i++)
{
if(position < _size)
{
DataPacket<mcopbyte> *packet = wqueue.front();
wqueue.pop();
packet->size = min(PACKET_SIZE, _size - position);
memcpy(packet->contents, data+position, packet->size);
age += packet->size;
position += packet->size;
packet->send();
}
}
}
void request_outdata(DataPacket<mcopbyte> *packet)
{
wqueue.push(packet);
processQueue();
}
void streamStart()
{
/*
* start streaming
*/
outdata.setPull(PACKET_COUNT, PACKET_SIZE);
}
void streamEnd()
{
/*
* end streaming
*/
outdata.endPull();
while(!wqueue.empty())
{
DataPacket<mcopbyte> *packet = wqueue.front();
packet->size = 0;
packet->send();
wqueue.pop();
}
}
};
REGISTER_IMPLEMENTATION(FileInputStream_impl);
const unsigned int
FileInputStream_impl::PACKET_COUNT = 8;
const unsigned int
FileInputStream_impl::PACKET_SIZE = 8192;
}
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