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// -*- mode:objc -*-
/*
** DVRDecoder.h
**
** Copyright 20101
**
** Author: George Nachman
**
** Project: iTerm2
**
** Description: Decodes the key+diff frame scheme implemented in
** DVREncoder. Used by the instant replay feature to load screen
** images out of a circular DVRBuffer owned by a DVR.
**
** 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#import <Cocoa/Cocoa.h>
#import <DVRBuffer.h>
@interface DVRDecoder : NSObject
{
// Circular buffer not owned by us.
DVRBuffer* buffer_;
// Most recent frame's metadata.
DVRFrameInfo info_;
// Most recent frame.
char* frame_;
// Length of frame.
int length_;
// Most recent frame's key (not timestamp).
long long key_;
}
- (id)initWithBuffer:(DVRBuffer*)buffer;
- (void)dealloc;
// Jump to a given timestamp, or the next available frame. Returns true on success.
// Returns false if timestamp is later than the last timestamp or there are no frames.
- (BOOL)seek:(long long)timestamp;
// Accessors for the most recent frame.
- (char*)decodedFrame;
- (int)length;
- (long long)timestamp;
- (DVRFrameInfo)info;
// Advance to next frame.
- (BOOL)next;
// Advance to previous frame.
- (BOOL)prev;
// Called when frame index key i is freed.
- (void)invalidateIndex:(long long)i;
@end
@interface DVRDecoder (Private)
// Seek directly to a particular key.
- (void)_seekToEntryWithKey:(long long)key;
// Load a key or diff frame from a particular key.
- (void)_loadKeyFrameWithKey:(long long)key;
- (void)_loadDiffFrameWithKey:(long long)key;
@end
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