Aegisub/aegisub/include/aegisub/video_provider.h
Karl Blomster 893ff2f78a Major rewrite of the video providing system. Hilights:
- It is now the responsibility of each video provider to provide a list of keyframe positions and (if it can) timecodes.
- The ffmpeg video provider now indexes files before opening them and does no longer rely on stream->duration to determine the number of frames. Fixes opening of MKV files, but it does not (currently) open timecodes automatically and reported keyframe positions seem way off. Status of frame-accuracy with MKV files unknown but it may very well work.
- Modified the way the ffmpeg video provider seeks (inspired by code from Myrsloik's ffmpegsource). Should no longer lose the first frame and should also no longer be frame-inaccurate, at least not with AVI.
- DirectShow video provider may or may not be completely broken, not tested.

Originally committed to SVN as r2252.
2008-07-15 00:08:05 +00:00

98 lines
3.8 KiB
C++

// Copyright (c) 2006-2008, Rodrigo Braz Monteiro, Fredrik Mellbin
// 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
//
// Website: http://aegisub.cellosoft.com
// Contact: mailto:zeratul@cellosoft.com
//
#pragma once
//////////
// Headers
#include <wx/wxprec.h>
#include "video_frame.h"
#include "aegisub.h"
#include "vfr.h"
//////////////
// Prototypes
class SubtitlesProvider;
////////////////////////////
// Video Provider interface
class VideoProvider {
public:
// Virtual destructor
virtual ~VideoProvider() {}
// Override this method to actually get frames
virtual const AegiVideoFrame GetFrame(int n, int formatMask)=0;
// Override the following methods to get video information:
virtual int GetPosition()=0; // Get the number of the last frame loaded
virtual int GetFrameCount()=0; // Get total number of frames
virtual int GetWidth()=0; // Returns the video width in pixels
virtual int GetHeight()=0; // Returns the video height in pixels
virtual double GetFPS()=0; // Get framerate in frames per second
virtual bool AreKeyFramesLoaded()=0; // Returns true if keyframe info is loaded, false otherwise
virtual bool IsVFR()=0; // Returns true if video is VFR
virtual wxArrayInt GetKeyFrames()=0; // Returns list of keyframes
virtual FrameRate GetTrueFrameRate()=0; // Returns magic VFR stuff
// Use this to set any post-loading warnings, such as "being loaded with unreliable seeking"
virtual Aegisub::String GetWarning() { return L""; }
// Name of decoder, e.g. "Avisynth/FFMPegSource"
virtual Aegisub::String GetDecoderName() { return L"Unknown"; }
// How many frames does this provider wants that Aegisub caches? Set to 0 if it doesn't require caching.
virtual int GetDesiredCacheSize() { return 0; }
// For providers that are natively time-based (e.g. DirectShow)
virtual bool IsNativelyByFrames() { return true; }
virtual void OverrideFrameTimeList(Aegisub::IntArray list) {} // Override the list with the provided one, for VFR handling
// If this video provider has a built-in subtitles provider, return that
virtual SubtitlesProvider *GetAsSubtitlesProvider() { return NULL; }
};
///////////
// Factory
class VideoProviderFactory {
public:
virtual ~VideoProviderFactory() {}
virtual VideoProvider *CreateProvider(Aegisub::String video,double fps=0.0)=0;
};