C++ video::VideoDecoder类代码示例

VideoEntryPtr VideoManager::open(const Common::String &fileName, Audio::Mixer::SoundType soundType) {
	// If this video is already playing, return that entry
	VideoEntryPtr oldVideo = findVideo(fileName);
	if (oldVideo)
		return oldVideo;

	// Otherwise, create a new entry
	Common::SeekableReadStream *stream = SearchMan.createReadStreamForMember(fileName);
	if (!stream)
		return VideoEntryPtr();

	Video::VideoDecoder *video = new Video::QuickTimeDecoder();
	video->setSoundType(soundType);
	if (!video->loadStream(stream)) {
		// FIXME: Better error handling
		delete video;
		return VideoEntryPtr();
	}

	// Create the entry
	VideoEntryPtr entry(new VideoEntry(video, fileName));

	// Enable dither if necessary
	checkEnableDither(entry);

	// Add it to the video list
	_videos.push_back(entry);

	return entry;
}

Video::VideoDecoder *ZVision::loadAnimation(const Common::String &fileName) {
	Common::String tmpFileName = fileName;
	tmpFileName.toLowercase();
	Video::VideoDecoder *animation = NULL;

	if (tmpFileName.hasSuffix(".rlf"))
		animation = new RLFDecoder();
	else if (tmpFileName.hasSuffix(".avi"))
		animation = new ZorkAVIDecoder();
#ifdef USE_MPEG2
	else if (tmpFileName.hasSuffix(".vob"))
		animation = new Video::MPEGPSDecoder();
#endif
	else
		error("Unknown suffix for animation %s", fileName.c_str());

	Common::File *_file = getSearchManager()->openFile(tmpFileName);
	if (!_file)
		error("Error opening %s", tmpFileName.c_str());

	bool loaded = animation->loadStream(_file);
	if (!loaded)
		error("Error loading animation %s", tmpFileName.c_str());

	return animation;
}

reg_t kPlayDuck(EngineState *s, int argc, reg_t *argv) {
	uint16 operation = argv[0].toUint16();
	Video::VideoDecoder *videoDecoder = 0;
	bool reshowCursor = g_sci->_gfxCursor->isVisible();

	switch (operation) {
	case 1:	// Play
		// 6 params
		s->_videoState.reset();
		s->_videoState.fileName = Common::String::format("%d.duk", argv[1].toUint16());

		videoDecoder = new Video::AVIDecoder();

		if (!videoDecoder->loadFile(s->_videoState.fileName)) {
			warning("Could not open Duck %s", s->_videoState.fileName.c_str());
			break;
		}

		if (reshowCursor)
			g_sci->_gfxCursor->kernelHide();

		{
		// Duck videos are 16bpp, so we need to change the active pixel format
		int oldWidth = g_system->getWidth();
		int oldHeight = g_system->getHeight();
		Common::List<Graphics::PixelFormat> formats;
		formats.push_back(videoDecoder->getPixelFormat());
		initGraphics(640, 480, true, formats);

		if (g_system->getScreenFormat().bytesPerPixel != videoDecoder->getPixelFormat().bytesPerPixel)
			error("Could not switch screen format for the duck video");

		playVideo(videoDecoder, s->_videoState);

		// Switch back to 8bpp
		initGraphics(oldWidth, oldHeight, oldWidth > 320);
		}

		if (reshowCursor)
			g_sci->_gfxCursor->kernelShow();
		break;
	default:
		kStub(s, argc, argv);
		break;
	}

	return s->r_acc;
}

bool VideoManager::updateMovies() {
	bool updateScreen = false;

	for (VideoList::iterator it = _videos.begin(); it != _videos.end(); ) {
		// Check of the video has reached the end
		if ((*it)->endOfVideo()) {
			if ((*it)->isLooping()) {
				// Seek back if looping
				(*it)->seek((*it)->getStart());
			} else {
				// Done; close and continue on
				(*it)->close();
				it = _videos.erase(it);
				continue;
			}
		}

		Video::VideoDecoder *video = (*it)->_video;

		// Ignore paused videos
		if (video->isPaused()) {
			it++;
			continue;
		}

		// Check if we need to draw a frame
		if (video->needsUpdate()) {
			if (drawNextFrame(*it)) {
				updateScreen = true;
			}
		}

		// Remember to increase the iterator
		it++;
	}

	// Return true if we need to update the screen
	return updateScreen;
}

void PrinceEngine::playVideo(Common::String videoFilename) {
        // Set the correct video mode
        initGraphics(640, 480, true, 0);
        if (_system->getScreenFormat().bytesPerPixel == 1) {
                warning("Couldn't switch to a RGB color video mode to play a video.");
                return;
        }

        debug(2, "Screen format: %s", _system->getScreenFormat().toString().c_str());

	Video::VideoDecoder *videoDecoder = new Video::AVIDecoder();
	if (!videoDecoder->loadFile(videoFilename)) {
		delete videoDecoder;
		warning("Unable to open video %s", videoFilename.c_str());
		initGraphics(640, 480, true);
		return;
	}

	videoDecoder->start();

	bool skipVideo = false;

	while (!shouldQuit() && !videoDecoder->endOfVideo() && !skipVideo) {
		if (videoDecoder->needsUpdate()) {
			const Graphics::Surface *frame = videoDecoder->decodeNextFrame();
			if (frame) {
				if (frame->format.bytesPerPixel > 1) {
					Graphics::Surface *frame1 = frame->convertTo(_system->getScreenFormat());
					_system->copyRectToScreen(frame1->getPixels(), frame1->pitch, 0, 0, frame1->w, frame1->h);
					frame1->free();
					delete frame1;
				} else {
					_system->copyRectToScreen(frame->getPixels(), frame->pitch, 0, 0, frame->w, frame->h);
				}
				_system->updateScreen();
			}
		}

		Common::Event event;
		while (_system->getEventManager()->pollEvent(event)) {
			if ((event.type == Common::EVENT_KEYDOWN && event.kbd.keycode == Common::KEYCODE_ESCAPE) ||
				event.type == Common::EVENT_LBUTTONUP)
				skipVideo = true;
		}

		_system->delayMillis(10);
	}

	delete videoDecoder;

	initGraphics(640, 480, true);
}

reg_t kPlayVMD(EngineState *s, int argc, reg_t *argv) {
	uint16 operation = argv[0].toUint16();
	Video::VideoDecoder *videoDecoder = 0;
	bool reshowCursor = g_sci->_gfxCursor->isVisible();
	Common::String warningMsg;

	switch (operation) {
	case 0:	// init
		s->_videoState.reset();
		s->_videoState.fileName = s->_segMan->derefString(argv[1]);

		if (argc > 2 && argv[2] != NULL_REG)
			warning("kPlayVMD: third parameter isn't 0 (it's %04x:%04x - %s)", PRINT_REG(argv[2]), s->_segMan->getObjectName(argv[2]));
		break;
	case 1:
	{
		// Set VMD parameters. Called with a maximum of 6 parameters:
		//
		// x, y, flags, gammaBoost, gammaFirst, gammaLast
		//
		// gammaBoost boosts palette colors in the range gammaFirst to
		// gammaLast, but only if bit 4 in flags is set. Percent value such that
		// 0% = no amplification These three parameters are optional if bit 4 is
		// clear. Also note that the x, y parameters play subtle games if used
		// with subfx 21. The subtleness has to do with creation of temporary
		// planes and positioning relative to such planes.

		uint16 flags = argv[3].getOffset();
		Common::String flagspec;

		if (argc > 3) {
			if (flags & kDoubled)
				flagspec += "doubled ";
			if (flags & kDropFrames)
				flagspec += "dropframes ";
			if (flags & kBlackLines)
				flagspec += "blacklines ";
			if (flags & kUnkBit3)
				flagspec += "bit3 ";
			if (flags & kGammaBoost)
				flagspec += "gammaboost ";
			if (flags & kHoldBlackFrame)
				flagspec += "holdblack ";
			if (flags & kHoldLastFrame)
				flagspec += "holdlast ";
			if (flags & kUnkBit7)
				flagspec += "bit7 ";
			if (flags & kStretch)
				flagspec += "stretch";

			warning("VMDFlags: %s", flagspec.c_str());

			s->_videoState.flags = flags;
		}

		warning("x, y: %d, %d", argv[1].getOffset(), argv[2].getOffset());
		s->_videoState.x = argv[1].getOffset();
		s->_videoState.y = argv[2].getOffset();

		if (argc > 4 && flags & 16)
			warning("gammaBoost: %d%% between palette entries %d and %d", argv[4].getOffset(), argv[5].getOffset(), argv[6].getOffset());
		break;
	}
	case 6:	// Play
		videoDecoder = new Video::AdvancedVMDDecoder();

		if (s->_videoState.fileName.empty()) {
			// Happens in Lighthouse
			warning("kPlayVMD: Empty filename passed");
			return s->r_acc;
		}

		if (!videoDecoder->loadFile(s->_videoState.fileName)) {
			warning("Could not open VMD %s", s->_videoState.fileName.c_str());
			break;
		}

		if (reshowCursor)
			g_sci->_gfxCursor->kernelHide();

		playVideo(videoDecoder, s->_videoState);

		if (reshowCursor)
			g_sci->_gfxCursor->kernelShow();
		break;
	case 23:	// set video palette range
		s->_vmdPalStart = argv[1].toUint16();
		s->_vmdPalEnd = argv[2].toUint16();
		break;
	case 14:
		// Takes an additional integer parameter (e.g. 3)
	case 16:
		// Takes an additional parameter, usually 0
	case 21:
		// Looks to be setting the video size and position. Called with 4 extra integer
		// parameters (e.g. 86, 41, 235, 106)
	default:
		warningMsg = Common::String::format("PlayVMD - unsupported subop %d. Params: %d (", operation, argc);

		for (int i = 0; i < argc; i++) {
//.........这里部分代码省略.........

reg_t kShowMovie(EngineState *s, int argc, reg_t *argv) {
	// Hide the cursor if it's showing and then show it again if it was
	// previously visible.
	bool reshowCursor = g_sci->_gfxCursor->isVisible();
	if (reshowCursor)
		g_sci->_gfxCursor->kernelHide();

	uint16 screenWidth = g_system->getWidth();
	uint16 screenHeight = g_system->getHeight();

	Video::VideoDecoder *videoDecoder = 0;

	if (argv[0].getSegment() != 0) {
		Common::String filename = s->_segMan->getString(argv[0]);

		if (g_sci->getPlatform() == Common::kPlatformMacintosh) {
			// Mac QuickTime
			// The only argument is the string for the video

			// HACK: Switch to 16bpp graphics for Cinepak.
			initGraphics(screenWidth, screenHeight, screenWidth > 320, NULL);

			if (g_system->getScreenFormat().bytesPerPixel == 1) {
				warning("This video requires >8bpp color to be displayed, but could not switch to RGB color mode");
				return NULL_REG;
			}

			videoDecoder = new Video::QuickTimeDecoder();
			if (!videoDecoder->loadFile(filename))
				error("Could not open '%s'", filename.c_str());
		} else {
			// DOS SEQ
			// SEQ's are called with no subops, just the string and delay
			// Time is specified as ticks
			videoDecoder = new SEQDecoder(argv[1].toUint16());

			if (!videoDecoder->loadFile(filename)) {
				warning("Failed to open movie file %s", filename.c_str());
				delete videoDecoder;
				videoDecoder = 0;
			}
		}
	} else {
		// Windows AVI
		// TODO: This appears to be some sort of subop. case 0 contains the string
		// for the video, so we'll just play it from there for now.

#ifdef ENABLE_SCI32
		if (getSciVersion() >= SCI_VERSION_2_1) {
			// SCI2.1 always has argv[0] as 1, the rest of the arguments seem to
			// follow SCI1.1/2.
			if (argv[0].toUint16() != 1)
				error("SCI2.1 kShowMovie argv[0] not 1");
			argv++;
			argc--;
		}
#endif
		switch (argv[0].toUint16()) {
		case 0: {
			Common::String filename = s->_segMan->getString(argv[1]);
			videoDecoder = new Video::AVIDecoder();

			if (filename.equalsIgnoreCase("gk2a.avi")) {
				// HACK: Switch to 16bpp graphics for Indeo3.
				// The only known movie to do use this codec is the GK2 demo trailer
				// If another video turns up that uses Indeo, we may have to add a better
				// check.
				initGraphics(screenWidth, screenHeight, screenWidth > 320, NULL);

				if (g_system->getScreenFormat().bytesPerPixel == 1) {
					warning("This video requires >8bpp color to be displayed, but could not switch to RGB color mode");
					return NULL_REG;
				}
			}

			if (!videoDecoder->loadFile(filename.c_str())) {
				warning("Failed to open movie file %s", filename.c_str());
				delete videoDecoder;
				videoDecoder = 0;
			} else {
				s->_videoState.fileName = filename;
			}
			break;
		}
		default:
			warning("Unhandled SCI kShowMovie subop %d", argv[0].toUint16());
		}
	}

	if (videoDecoder) {
		playVideo(videoDecoder, s->_videoState);

		// HACK: Switch back to 8bpp if we played a true color video.
		// We also won't be copying the screen to the SCI screen...
		if (g_system->getScreenFormat().bytesPerPixel != 1)
			initGraphics(screenWidth, screenHeight, screenWidth > 320);
		else {
			g_sci->_gfxScreen->kernelSyncWithFramebuffer();
			g_sci->_gfxPalette->kernelSyncScreenPalette();
		}
//.........这里部分代码省略.........

void ZVision::playVideo(Video::VideoDecoder &vid, const Common::Rect &destRect, bool skippable, Subtitle *sub) {
	Common::Rect dst = destRect;
	// If destRect is empty, no specific scaling was requested. However, we may choose to do scaling anyway
	if (dst.isEmpty())
		dst = Common::Rect(vid.getWidth(), vid.getHeight());

	Graphics::Surface scaled;

	if (vid.getWidth() != dst.width() || vid.getHeight() != dst.height())
		scaled.create(dst.width(), dst.height(), vid.getPixelFormat());

	uint16 x = _workingWindow.left + dst.left;
	uint16 y = _workingWindow.top + dst.top;
	uint16 finalWidth = dst.width() < _workingWindow.width() ? dst.width() : _workingWindow.width();
	uint16 finalHeight = dst.height() < _workingWindow.height() ? dst.height() : _workingWindow.height();
	bool showSubs = (_scriptManager->getStateValue(StateKey_Subtitles) == 1);

	_clock.stop();
	vid.start();
	_videoIsPlaying = true;

	// Only continue while the video is still playing
	while (!shouldQuit() && !vid.endOfVideo() && vid.isPlaying()) {
		// Check for engine quit and video stop key presses
		while (_eventMan->pollEvent(_event)) {
			switch (_event.type) {
			case Common::EVENT_KEYDOWN:
				switch (_event.kbd.keycode) {
				case Common::KEYCODE_q:
					if (_event.kbd.hasFlags(Common::KBD_CTRL))
						quitGame();
					break;
				case Common::KEYCODE_SPACE:
					if (skippable) {
						vid.stop();
					}
					break;
				default:
					break;
				}
			default:
				break;
			}
		}

		if (vid.needsUpdate()) {
			const Graphics::Surface *frame = vid.decodeNextFrame();
			if (sub && showSubs)
				sub->process(vid.getCurFrame());

			if (frame) {
				if (scaled.getPixels()) {
					_renderManager->scaleBuffer(frame->getPixels(), scaled.getPixels(), frame->getWidth(), frame->getHeight(), frame->getFormat().bytesPerPixel, scaled.getWidth(), scaled.getHeight());
					frame = &scaled;
				}
				Common::Rect rect = Common::Rect(x, y, x + finalWidth, y + finalHeight);
				_renderManager->copyToScreen(*frame, rect, 0, 0);
				_renderManager->processSubs(0);
			}
		}

		// Always update the screen so the mouse continues to render
		_system->updateScreen();

		_system->delayMillis(vid.getTimeToNextFrame() / 2);
	}

	_videoIsPlaying = false;
	_clock.start();
}

void ZVision::playVideo(Video::VideoDecoder &videoDecoder, const Common::Rect &destRect, bool skippable) {
	byte bytesPerPixel = videoDecoder.getPixelFormat().bytesPerPixel;

	uint16 origWidth = videoDecoder.getWidth();
	uint16 origHeight = videoDecoder.getHeight();

	uint scale = 1;
	// If destRect is empty, no specific scaling was requested. However, we may choose to do scaling anyway
	if (destRect.isEmpty()) {
		// Most videos are very small. Therefore we do a simple 2x scale
		if (origWidth * 2 <= 640 && origHeight * 2 <= 480) {
			scale = 2;
		}
	} else {
		// Assume bilinear scaling. AKA calculate the scale from just the width.
		// Also assume that the scaling is in integral intervals. AKA no 1.5x scaling
		// TODO: Test ^these^ assumptions
		scale = destRect.width() / origWidth;

		// TODO: Test if we need to support downscale.
	}

	uint16 pitch = origWidth * bytesPerPixel;

	uint16 finalWidth = origWidth * scale;
	uint16 finalHeight = origHeight * scale;

	byte *scaledVideoFrameBuffer;
	if (scale != 1) {
		scaledVideoFrameBuffer = new byte[finalWidth * finalHeight * bytesPerPixel];
	}

	uint16 x = ((WINDOW_WIDTH - finalWidth) / 2) + destRect.left;
	uint16 y = ((WINDOW_HEIGHT - finalHeight) / 2) + destRect.top;

	_clock.stop();
	videoDecoder.start();

	// Only continue while the video is still playing
	while (!shouldQuit() && !videoDecoder.endOfVideo() && videoDecoder.isPlaying()) {
		// Check for engine quit and video stop key presses
		while (!videoDecoder.endOfVideo() && videoDecoder.isPlaying() && _eventMan->pollEvent(_event)) {
			switch (_event.type) {
			case Common::EVENT_KEYDOWN:
				switch (_event.kbd.keycode) {
				case Common::KEYCODE_q:
					if (_event.kbd.hasFlags(Common::KBD_CTRL))
						quitGame();
					break;
				case Common::KEYCODE_SPACE:
					if (skippable) {
						videoDecoder.stop();
					}
					break;
				default:
					break;
				}
			default:
				break;
			}
		}

		if (videoDecoder.needsUpdate()) {
			const Graphics::Surface *frame = videoDecoder.decodeNextFrame();

			if (frame) {
				if (scale != 1) {
					scaleBuffer((const byte *)frame->getPixels(), scaledVideoFrameBuffer, origWidth, origHeight, bytesPerPixel, scale);
					_system->copyRectToScreen(scaledVideoFrameBuffer, pitch * 2, x, y, finalWidth, finalHeight);
				} else {
					_system->copyRectToScreen((const byte *)frame->getPixels(), pitch, x, y, finalWidth, finalHeight);
				}
			}
		}

		// Always update the screen so the mouse continues to render
		_system->updateScreen();

		_system->delayMillis(videoDecoder.getTimeToNextFrame());
	}

	_clock.start();

	if (scale != 1) {
		delete[] scaledVideoFrameBuffer;
	}
}

bool VideoManager::drawNextFrame(VideoEntryPtr videoEntry) {
	Video::VideoDecoder *video = videoEntry->_video;
	const Graphics::Surface *frame = video->decodeNextFrame();

	if (!frame || !videoEntry->isEnabled()) {
		return false;
	}

	Graphics::Surface *convertedFrame = nullptr;
	Graphics::PixelFormat pixelFormat = _vm->_system->getScreenFormat();

	if (frame->format != pixelFormat) {
		// We don't support downconverting to 8bpp without having
		// support in the codec. Set _enableDither if shows up.
		if (pixelFormat.bytesPerPixel == 1) {
			warning("Cannot convert high color video frame to 8bpp");
			return false;
		}

		// Convert to the current screen format
		convertedFrame = frame->convertTo(pixelFormat, video->getPalette());
		frame = convertedFrame;
	} else if (pixelFormat.bytesPerPixel == 1 && video->hasDirtyPalette()) {
		// Set the palette when running in 8bpp mode only
		// Don't do this for Myst, which has its own per-stack handling
		if (_vm->getGameType() != GType_MYST)
			_vm->_system->getPaletteManager()->setPalette(video->getPalette(), 0, 256);
	}

	// Clip the video to make sure it stays on the screen (Myst does this a few times)
	Common::Rect targetRect = Common::Rect(video->getWidth(), video->getHeight());
	targetRect.translate(videoEntry->getX(), videoEntry->getY());

	Common::Rect frameRect = Common::Rect(video->getWidth(), video->getHeight());

	if (targetRect.left < 0) {
		frameRect.left -= targetRect.left;
		targetRect.left = 0;
	}

	if (targetRect.top < 0) {
		frameRect.top -= targetRect.top;
		targetRect.top = 0;
	}

	if (targetRect.right > _vm->_system->getWidth()) {
		frameRect.right -= targetRect.right - _vm->_system->getWidth();
		targetRect.right = _vm->_system->getWidth();
	}

	if (targetRect.bottom > _vm->_system->getHeight()) {
		frameRect.bottom -= targetRect.bottom - _vm->_system->getHeight();
		targetRect.bottom = _vm->_system->getHeight();
	}

	_vm->_system->copyRectToScreen(frame->getBasePtr(frameRect.left, frameRect.top), frame->pitch,
	                               targetRect.left, targetRect.top, targetRect.width(), targetRect.height());

	// Delete 8bpp conversion surface
	if (convertedFrame) {
		convertedFrame->free();
		delete convertedFrame;
	}

	// We've drawn something to the screen, make sure we update it
	return true;
}

bool VideoManager::updateMovies() {
	bool updateScreen = false;

	for (VideoList::iterator it = _videos.begin(); it != _videos.end(); ) {
		// Check of the video has reached the end
		if ((*it)->endOfVideo()) {
			if ((*it)->isLooping()) {
				// Seek back if looping
				(*it)->seek((*it)->getStart());
			} else {
				// Done; close and continue on
				(*it)->close();
				it = _videos.erase(it);
				continue;
			}
		}

		Video::VideoDecoder *video = (*it)->_video;

		// Ignore paused videos
		if (video->isPaused()) {
			it++;
			continue;
		}

		// Check if we need to draw a frame
		if (video->needsUpdate()) {
			const Graphics::Surface *frame = video->decodeNextFrame();
			Graphics::Surface *convertedFrame = 0;

			if (frame && (*it)->isEnabled()) {
				Graphics::PixelFormat pixelFormat = _vm->_system->getScreenFormat();

				if (frame->format != pixelFormat) {
					// We don't support downconverting to 8bpp without having
					// support in the codec. Set _enableDither if shows up.
					if (pixelFormat.bytesPerPixel == 1) {
						warning("Cannot convert high color video frame to 8bpp");
						(*it)->close();
						it = _videos.erase(it);
						continue;
					}

					// Convert to the current screen format
					convertedFrame = frame->convertTo(pixelFormat, video->getPalette());
					frame = convertedFrame;
				} else if (pixelFormat.bytesPerPixel == 1 && video->hasDirtyPalette()) {
					// Set the palette when running in 8bpp mode only
					// Don't do this for Myst, which has its own per-stack handling
					if (_vm->getGameType() != GType_MYST)
						_vm->_system->getPaletteManager()->setPalette(video->getPalette(), 0, 256);
				}

				// Clip the width/height to make sure we stay on the screen (Myst does this a few times)
				uint16 width = MIN<int32>(video->getWidth(), _vm->_system->getWidth() - (*it)->getX());
				uint16 height = MIN<int32>(video->getHeight(), _vm->_system->getHeight() - (*it)->getY());
				_vm->_system->copyRectToScreen(frame->getPixels(), frame->pitch, (*it)->getX(), (*it)->getY(), width, height);

				// We've drawn something to the screen, make sure we update it
				updateScreen = true;

				// Delete 8bpp conversion surface
				if (convertedFrame) {
					convertedFrame->free();
					delete convertedFrame;
				}
			}
		}

		// Check the video time
		_vm->doVideoTimer(*it, false);

		// Remember to increase the iterator
		it++;
	}

	// Return true if we need to update the screen
	return updateScreen;
}