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135 lines
3.9 KiB
C++
135 lines
3.9 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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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 3 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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "common/debug.h"
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#include "audio/audiostream.h"
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#include "groovie/video/player.h"
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#include "groovie/groovie.h"
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#include "audio/mixer.h"
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#include "common/debug-channels.h"
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namespace Groovie {
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VideoPlayer::VideoPlayer(GroovieEngine *vm) :
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_vm(vm), _syst(vm->_system), _file(nullptr), _audioStream(nullptr), _fps(0), _overrideSpeed(false), _flags(0),
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_begunPlaying(false), _millisBetweenFrames(0), _lastFrameTime(0), _frameTimeDrift(0) {
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}
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bool VideoPlayer::load(Common::SeekableReadStream *file, uint16 flags) {
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_file = file;
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_flags = flags;
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_overrideSpeed = false;
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stopAudioStream();
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_fps = loadInternal();
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if (_fps != 0) {
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setOverrideSpeed(_overrideSpeed);
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_begunPlaying = false;
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return true;
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} else {
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_file = nullptr;
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return false;
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}
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}
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void VideoPlayer::setOverrideSpeed(bool isOverride) {
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_overrideSpeed = isOverride;
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if (_fps != 0) {
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if (isOverride)
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_millisBetweenFrames = 1000.0f / 26.0f;
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else
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_millisBetweenFrames = 1000.0f / float(_fps);
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}
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}
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void VideoPlayer::fastForward() {
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_millisBetweenFrames = 0;
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_frameTimeDrift = 0;
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stopAudioStream();
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}
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bool VideoPlayer::isFastForwarding() {
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return DebugMan.isDebugChannelEnabled(kDebugFast) || _millisBetweenFrames <= 0;
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}
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bool VideoPlayer::playFrame() {
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bool end = true;
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// Process the next frame while the file is open
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if (_file) {
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end = playFrameInternal();
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}
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// The file has been completely processed
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if (end) {
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_file = nullptr;
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// Wait for pending audio
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if (_audioStream) {
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if (_audioStream->endOfData() || isFastForwarding()) {
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// Mark the audio stream as finished (no more data will be appended)
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_audioStream->finish();
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_audioStream = nullptr;
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} else {
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// Don't end if there's still audio playing
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end = false;
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}
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}
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}
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return end;
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}
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void VideoPlayer::waitFrame() {
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if (isFastForwarding()) {
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return;
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}
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uint32 currTime = _syst->getMillis();
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if (!_begunPlaying) {
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_begunPlaying = true;
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_lastFrameTime = currTime;
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_frameTimeDrift = 0.0f;
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} else {
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uint32 millisDiff = currTime - _lastFrameTime;
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float fMillis = _millisBetweenFrames + _frameTimeDrift;
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// use floorf instead of roundf, because delayMillis often slightly over-sleeps
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uint32 millisSleep = fmaxf(0.0f, floorf(fMillis) - float(millisDiff));
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if (millisSleep > 0) {
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debugC(7, kDebugVideo, "Groovie::Player: Delaying %d (currTime=%d, _lastFrameTime=%d, millisDiff=%d, _millisBetweenFrame=%.2f, _frameTimeDrift=%.2f)",
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millisSleep, currTime, _lastFrameTime, millisDiff, _millisBetweenFrames, _frameTimeDrift);
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_syst->delayMillis(millisSleep);
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currTime = _syst->getMillis();
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debugC(7, kDebugVideo, "Groovie::Player: Finished delay at %d", currTime);
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}
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_frameTimeDrift = fMillis - float(currTime - _lastFrameTime);
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if (abs(_frameTimeDrift) >= _millisBetweenFrames) {
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_frameTimeDrift = 0;
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}
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debugC(6, kDebugVideo, "Groovie::Player: Frame displayed at %d (%f FPS), _frameTimeDrift=%.2f", currTime, 1000.0 / (currTime - _lastFrameTime), _frameTimeDrift);
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_lastFrameTime = currTime;
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}
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}
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} // End of Groovie namespace
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