122 lines
3.3 KiB
C++
122 lines
3.3 KiB
C++
// ------------------------------------------------------------------------
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// audioio-db-buffer.cpp: Buffer used between db server and client
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// Copyright (C) 2000-2002 Kai Vehmanen
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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
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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// ------------------------------------------------------------------------
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#include "samplebuffer.h"
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#include "audioio-db-buffer.h"
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/**
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* Constructor.
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*/
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AUDIO_IO_DB_BUFFER::AUDIO_IO_DB_BUFFER(int number_of_buffers,
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long int buffersize,
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int channels)
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: readptr_rep(0),
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writeptr_rep(0),
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finished_rep(0),
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sbufs_rep(number_of_buffers)
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{
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for(size_t n = 0; n < sbufs_rep.size(); n++) {
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sbufs_rep[n] = new SAMPLE_BUFFER(buffersize, channels);
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}
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// std::cerr << "Created a new client buffer with " << sbufs_rep.size() << " buffers." << std::endl;
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}
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AUDIO_IO_DB_BUFFER::~AUDIO_IO_DB_BUFFER(void)
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{
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for(size_t n = 0; n < sbufs_rep.size(); n++) {
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delete sbufs_rep[n];
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}
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}
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/**
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* Resets all pointers to their initial state.
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*/
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void AUDIO_IO_DB_BUFFER::reset(void)
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{
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readptr_rep.set(0);
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writeptr_rep.set(0);
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finished_rep.set(0);
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}
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/**
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* Number of sample buffer available for reading.
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*
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* Note! As concurrent access is allowed by
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* the implement, the actual number of
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* samples available for reading can
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* be greater than that reported by
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* read_space().
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*/
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int AUDIO_IO_DB_BUFFER::read_space(void)
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{
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int write = writeptr_rep.get();
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int read = readptr_rep.get();
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if (write >= read)
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return(write - read);
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else
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return((write - read + sbufs_rep.size()) % sbufs_rep.size());
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}
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/**
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* Number of sample buffers available for writing.
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*
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* Note! As concurrent access is allowed by
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* the implement, the actual number of
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* samples available for writing can
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* be greater than that reported by
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* write_space().
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*/
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int AUDIO_IO_DB_BUFFER::write_space(void)
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{
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int write = writeptr_rep.get();
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int read = readptr_rep.get();
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if (write > read)
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return(((read - write + sbufs_rep.size()) % sbufs_rep.size()) - 1);
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else if (write < read)
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return(read - write - 1);
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else
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return(sbufs_rep.size() - 1);
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}
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/**
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* Increment the read pointer by one.
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*
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* Note! Cannot be called from multiple concurrent
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* execution contexts.
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**/
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void AUDIO_IO_DB_BUFFER::advance_read_pointer(void)
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{
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readptr_rep.set((readptr_rep.get() + 1) % sbufs_rep.size());
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}
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/**
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* Increment the write pointer by one.
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*
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* Note! Cannot be called from multiple concurrent
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* execution contexts.
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**/
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void AUDIO_IO_DB_BUFFER::advance_write_pointer(void)
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{
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writeptr_rep.set((writeptr_rep.get() + 1) % sbufs_rep.size());
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}
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