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194 lines
3.7 KiB
194 lines
3.7 KiB
/*
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Copyright (C) 2001 Stefan Westerfeld
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stefan@space.twc.de
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include "kmedia2.h"
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#include "stdsynthmodule.h"
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#include "debug.h"
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#include <unistd.h>
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#include <sys/mman.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <iostream>
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#include <cstring>
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using namespace std;
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using namespace Arts;
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namespace Arts {
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class FileInputStream_impl : virtual public FileInputStream_skel,
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virtual public StdSynthModule
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{
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protected:
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string _filename;
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int age, fd;
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unsigned int _size, position;
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mcopbyte *data;
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queue< DataPacket<mcopbyte>* > wqueue;
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public:
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static const unsigned int PACKET_COUNT;
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static const unsigned int PACKET_SIZE;
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FileInputStream_impl()
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{
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fd = -1;
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position = 0;
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data = 0;
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age = 0;
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_size = 0;
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}
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~FileInputStream_impl()
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{
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arts_assert(wqueue.size() == 0);
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close();
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}
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void close()
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{
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if(data != 0)
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{
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munmap((char*)data, _size);
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data = 0;
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}
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if(fd >= 0)
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{
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::close(fd);
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fd = -1;
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}
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}
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bool open(const string& filename)
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{
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close();
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fd = ::open(filename.c_str(), O_RDONLY);
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if(fd < 0)
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return false;
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_size = lseek(fd, 0, SEEK_END);
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lseek(fd, 0, SEEK_SET);
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data = (mcopbyte *)mmap(0, _size, PROT_READ, MAP_SHARED, fd, 0);
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if(data == 0)
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{
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close();
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return false;
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}
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position = 0;
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if(_filename != filename)
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{
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_filename = filename;
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filename_changed(filename);
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}
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return true;
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}
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string filename() { return _filename; }
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void filename(const string& newfilename) { open(newfilename); }
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long size() { return _size; }
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bool eof()
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{
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return (fd < 0 || position >= _size)
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&& (wqueue.size() == PACKET_COUNT);
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}
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bool seekOk() { return true; }
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long seek(long newPosition)
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{
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arts_return_val_if_fail(fd < 0, -1);
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arts_return_val_if_fail(newPosition < 0, -1);
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arts_return_val_if_fail(newPosition > (long)_size, -1);
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long ageBeforeSeek = age;
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position = newPosition;
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processQueue();
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return ageBeforeSeek;
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}
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void processQueue()
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{
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unsigned int qsize = wqueue.size();
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for(unsigned int i = 0; i < qsize; i++)
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{
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if(position < _size)
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{
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DataPacket<mcopbyte> *packet = wqueue.front();
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wqueue.pop();
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packet->size = min(PACKET_SIZE, _size - position);
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memcpy(packet->contents, data+position, packet->size);
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age += packet->size;
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position += packet->size;
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packet->send();
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}
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}
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}
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void request_outdata(DataPacket<mcopbyte> *packet)
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{
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wqueue.push(packet);
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processQueue();
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}
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void streamStart()
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{
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/*
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* start streaming
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*/
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outdata.setPull(PACKET_COUNT, PACKET_SIZE);
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}
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void streamEnd()
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{
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/*
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* end streaming
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*/
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outdata.endPull();
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while(!wqueue.empty())
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{
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DataPacket<mcopbyte> *packet = wqueue.front();
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packet->size = 0;
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packet->send();
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wqueue.pop();
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}
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}
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};
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REGISTER_IMPLEMENTATION(FileInputStream_impl);
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const unsigned int
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FileInputStream_impl::PACKET_COUNT = 8;
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const unsigned int
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FileInputStream_impl::PACKET_SIZE = 8192;
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}
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