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/* aKode AudioBuffer
Copyright (C) 2004-2005 Allan Sandfeld Jensen <kde@carewolf.com>
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., 51 Franklin Steet, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "audiobuffer.h"
#include "audioframe.h"
namespace aKode {
AudioBuffer::AudioBuffer(unsigned int len) : length(len), readPos(0), writePos(0),
flushed(false), released(false), paused(false), m_eof(false)
{
buffer = new AudioFrame[len];
}
AudioBuffer::~AudioBuffer() {
delete[] buffer;
}
bool AudioBuffer::put(AudioFrame* buf, bool blocking) {
mutex.lock();
if (released) goto fail;
flushed = false;
if ((writePos+1) % length == readPos) {
if (blocking) {
not_full.wait(&mutex);
if (flushed || released) goto fail;
}
else
goto fail;
}
swapFrames(&buffer[writePos], buf);
writePos = (writePos+1) % length;
not_empty.signal();
mutex.unlock();
return true;
fail:
mutex.unlock();
return false;
}
bool AudioBuffer::get(AudioFrame* buf, bool blocking) {
mutex.lock();
if (released) goto fail;
if (readPos == writePos || paused) {
if (blocking && !m_eof) {
not_empty.wait(&mutex);
if (released) goto fail;
if (empty()) goto fail;
}
else
goto fail;
}
swapFrames(buf, &buffer[readPos]);
readPos = (readPos+1) % length;
not_full.signal();
mutex.unlock();
return true;
fail:
mutex.unlock();
return false;
}
long AudioBuffer::position() {
long out = -1;
mutex.lock();
if (!empty() && !released)
out = buffer[readPos].pos;
mutex.unlock();
return out;
}
bool AudioBuffer::empty() {
return (readPos == writePos);
}
bool AudioBuffer::full() {
return (readPos == (writePos+1) % length);
}
void AudioBuffer::setEOF() {
mutex.lock();
m_eof = true;
not_empty.signal();
mutex.unlock();
}
bool AudioBuffer::eof() {
return m_eof && empty();
}
void AudioBuffer::reset() {
// We assume all processes have been released at this point
readPos = writePos = 0;
flushed = released = paused = m_eof = false;
}
void AudioBuffer::flush() {
mutex.lock();
// Don't free the frames, most likely this is just a seek
// and the same buffer-sizes will be needed afterwards.
readPos = writePos = 0;
flushed = true;
not_full.signal();
mutex.unlock();
}
void AudioBuffer::release() {
mutex.lock();
released = true;
not_full.signal();
not_empty.signal();
mutex.unlock();
}
void AudioBuffer::pause() {
paused = true;
}
void AudioBuffer::resume() {
mutex.lock();
paused = false;
if (!empty())
not_empty.signal();
mutex.unlock();
}
} // namespace
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