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Diffstat (limited to 'soundserver/fileinputstream_impl.cc')
| -rw-r--r-- | soundserver/fileinputstream_impl.cc | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/soundserver/fileinputstream_impl.cc b/soundserver/fileinputstream_impl.cc new file mode 100644 index 0000000..e44faa2 --- /dev/null +++ b/soundserver/fileinputstream_impl.cc @@ -0,0 +1,193 @@ + /* + + 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; + +} |