Aegisub/aegisub/src/video_context.h

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// Copyright (c) 2005-2007, Rodrigo Braz Monteiro
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of the Aegisub Group nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// Aegisub Project http://www.aegisub.org/
//
// $Id$
/// @file video_context.h
/// @see video_context.cpp
/// @ingroup video
///
#ifndef AGI_PRE
#include <time.h>
#include <list>
#include <memory>
#include <wx/timer.h>
#include <wx/stopwatch.h>
#endif
#include <libaegisub/scoped_ptr.h>
#include <libaegisub/signal.h>
#include <libaegisub/vfr.h>
class AegiVideoFrame;
class SubtitlesProviderErrorEvent;
class ThreadedFrameSource;
class VideoProvider;
class VideoProviderErrorEvent;
namespace agi {
struct Context;
class OptionValue;
}
/// @class VideoContext
/// @brief Manage a bunch of things vaguely related to video playback
///
/// VideoContext's core responsibility is opening and playing videos. Along
/// with that, it also manages video timecodes and keyframes, and some
/// video-related UI properties
class VideoContext : public wxEvtHandler {
/// Current frame number changed (new frame number)
agi::signal::Signal<int> Seek;
/// A new video was opened
agi::signal::Signal<> VideoOpen;
/// New keyframes opened (new keyframe data)
agi::signal::Signal<std::vector<int> const&> KeyframesOpen;
/// New timecodes opened (new timecode data)
agi::signal::Signal<agi::vfr::Framerate const&> TimecodesOpen;
/// Aspect ratio was changed (type, value)
agi::signal::Signal<int, double> ARChange;
agi::Context *context;
/// The video provider owned by the threaded frame source, or NULL if no
/// video is open
VideoProvider *videoProvider;
/// Asynchronous provider of video frames
agi::scoped_ptr<ThreadedFrameSource> provider;
/// Filename of currently open video
wxString videoFile;
/// List of frame numbers which are keyframes
std::vector<int> keyFrames;
/// File name of the currently open keyframes or empty if keyframes are not overridden
wxString keyFramesFilename;
/// Playback timer used to periodically check if we should go to the next
/// frame while playing video
wxTimer playback;
/// Time since playback was last started
wxStopWatch playTime;
/// The start time of the first frame of the current playback; undefined if
/// video is not currently playing
int startMS;
/// The last frame to play if video is currently playing
int endFrame;
/// The frame number which was last requested from the video provider,
/// which may not be the same thing as the currently displayed frame
int frame_n;
/// The picture aspect ratio of the video if the aspect ratio has been
/// overridden by the user
double arValue;
/// @brief The current AR type
///
/// 0 is square pixels; 1-3 are predefined ARs; 4 is custom, where the real
/// AR is in arValue
int arType;
/// Does the currently loaded video file have subtitles muxed into it?
bool hasSubtitles;
/// Filename of the currently loaded timecodes file, or empty if timecodes
/// have not been overridden
wxString ovrTimecodeFile;
/// Cached option for audio playing when frame stepping
const agi::OptionValue* playAudioOnStep;
void OnPlayTimer(wxTimerEvent &event);
/// The timecodes from the video file
agi::vfr::Framerate videoFPS;
/// External timecode which have been loaded, if any
agi::vfr::Framerate ovrFPS;
void OnVideoError(VideoProviderErrorEvent const& err);
void OnSubtitlesError(SubtitlesProviderErrorEvent const& err);
void OnSubtitlesCommit();
void OnSubtitlesSave();
/// Close the video, keyframes and timecodes
void Reset();
public:
VideoContext();
~VideoContext();
/// @brief Set the context that this is the video controller for
/// @param context Initialized project context
///
/// Once this is no longer a singleton this can probably be moved into
/// the constructor
void SetContext(agi::Context *context);
/// @brief Get the video provider used for the currently open video
VideoProvider *GetProvider() const { return videoProvider; }
/// Synchronously get a video frame
/// @param n Frame number to get
/// @param raw If true, subtitles are not rendered on the frame
/// @return The requested frame
std::tr1::shared_ptr<AegiVideoFrame> GetFrame(int n, bool raw = false);
/// Asynchronously get a video frame, triggering a EVT_FRAME_READY event when it's ready
/// @param n Frame number to get
void GetFrameAsync(int n);
/// Is there a video loaded?
bool IsLoaded() const { return !!videoProvider; }
/// Get the file name of the currently open video, if any
wxString GetVideoName() const { return videoFile; }
/// Is the video currently playing?
bool IsPlaying() const { return playback.IsRunning(); }
/// Does the video file loaded have muxed subtitles that we can load?
bool HasSubtitles() const { return hasSubtitles; }
/// Get the width of the currently open video
int GetWidth() const;
/// Get the height of the currently open video
int GetHeight() const;
/// Get the length in frames of the currently open video
int GetLength() const;
/// Get the current frame number
int GetFrameN() const { return frame_n; }
/// Get the actual aspect ratio from a predefined AR type
double GetARFromType(int type) const;
/// Override the aspect ratio of the currently loaded video
/// @param type Aspect ratio type from 0-4
/// @param value If type is 4 (custom), the aspect ratio to use
void SetAspectRatio(int type, double value=1.0);
/// Get the current AR type
int GetAspectRatioType() const { return arType; }
/// Get the current aspect ratio of the video
double GetAspectRatioValue() const { return arValue; }
/// @brief Open a new video
/// @param filename Video to open, or empty to close the current video
void SetVideo(const wxString &filename);
/// @brief Close and reopen the current video
void Reload();
/// @brief Jump to the beginning of a frame
/// @param n Frame number to jump to
void JumpToFrame(int n);
/// @brief Jump to a time
/// @param ms Time to jump to in milliseconds
/// @param end Type of time
void JumpToTime(int ms, agi::vfr::Time end = agi::vfr::START);
/// Starting playing the video
void Play();
/// Play the next frame then stop
void NextFrame();
/// Play the previous frame then stop
void PrevFrame();
/// Seek to the beginning of the current line, then play to the end of it
void PlayLine();
/// Stop playing
void Stop();
DEFINE_SIGNAL_ADDERS(Seek, AddSeekListener)
DEFINE_SIGNAL_ADDERS(VideoOpen, AddVideoOpenListener)
DEFINE_SIGNAL_ADDERS(KeyframesOpen, AddKeyframesListener)
DEFINE_SIGNAL_ADDERS(TimecodesOpen, AddTimecodesListener)
DEFINE_SIGNAL_ADDERS(ARChange, AddARChangeListener)
const std::vector<int>& GetKeyFrames() const { return keyFrames; };
wxString GetKeyFramesName() const { return keyFramesFilename; }
void LoadKeyframes(wxString filename);
void SaveKeyframes(wxString filename);
void CloseKeyframes();
bool OverKeyFramesLoaded() const { return !keyFramesFilename.empty(); }
bool KeyFramesLoaded() const { return !keyFrames.empty(); }
wxString GetTimecodesName() const { return ovrTimecodeFile; }
void LoadTimecodes(wxString filename);
void SaveTimecodes(wxString filename);
void CloseTimecodes();
bool OverTimecodesLoaded() const { return ovrFPS.IsLoaded(); }
bool TimecodesLoaded() const { return videoFPS.IsLoaded() || ovrFPS.IsLoaded(); };
const agi::vfr::Framerate& FPS() const { return ovrFPS.IsLoaded() ? ovrFPS : videoFPS; }
const agi::vfr::Framerate& VideoFPS() const { return videoFPS; }
int TimeAtFrame(int frame, agi::vfr::Time type = agi::vfr::EXACT) const;
int FrameAtTime(int time, agi::vfr::Time type = agi::vfr::EXACT) const;
static VideoContext *Get();
static void OnExit();
};