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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "video/video_decoder.h"
#include "audio/mixer.h" // for kMaxChannelVolume
#include "common/rational.h"
#include "common/file.h"
#include "common/system.h"
#include "graphics/palette.h"
namespace Video {
VideoDecoder::VideoDecoder() {
reset();
}
bool VideoDecoder::loadFile(const Common::String &filename) {
Common::File *file = new Common::File();
if (!file->open(filename)) {
delete file;
return false;
}
return loadStream(file);
}
uint32 VideoDecoder::getTime() const {
return g_system->getMillis() - _startTime;
}
void VideoDecoder::setSystemPalette() {
g_system->getPaletteManager()->setPalette(getPalette(), 0, 256);
}
bool VideoDecoder::needsUpdate() const {
return !endOfVideo() && getTimeToNextFrame() == 0;
}
void VideoDecoder::reset() {
_curFrame = -1;
_startTime = 0;
_pauseLevel = 0;
_audioVolume = Audio::Mixer::kMaxChannelVolume;
_audioBalance = 0;
}
bool VideoDecoder::endOfVideo() const {
return !isVideoLoaded() || (getCurFrame() >= (int32)getFrameCount() - 1);
}
void VideoDecoder::pauseVideo(bool pause) {
if (pause) {
_pauseLevel++;
// We can't go negative
} else if (_pauseLevel) {
_pauseLevel--;
// Do nothing
} else {
return;
}
if (_pauseLevel == 1 && pause) {
_pauseStartTime = g_system->getMillis(); // Store the starting time from pausing to keep it for later
pauseVideoIntern(true);
} else if (_pauseLevel == 0) {
pauseVideoIntern(false);
addPauseTime(g_system->getMillis() - _pauseStartTime);
}
}
void VideoDecoder::resetPauseStartTime() {
if (isPaused())
_pauseStartTime = g_system->getMillis();
}
void VideoDecoder::setVolume(byte volume) {
_audioVolume = volume;
updateVolume();
}
void VideoDecoder::setBalance(int8 balance) {
_audioBalance = balance;
updateBalance();
}
uint32 FixedRateVideoDecoder::getTimeToNextFrame() const {
if (endOfVideo() || _curFrame < 0)
return 0;
uint32 elapsedTime = getTime();
uint32 nextFrameStartTime = getFrameBeginTime(_curFrame + 1);
// If the time that the next frame should be shown has past
// the frame should be shown ASAP.
if (nextFrameStartTime <= elapsedTime)
return 0;
return nextFrameStartTime - elapsedTime;
}
uint32 FixedRateVideoDecoder::getFrameBeginTime(uint32 frame) const {
Common::Rational beginTime = frame * 1000;
beginTime /= getFrameRate();
return beginTime.toInt();
}
} // End of namespace Video
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