MPD  0.20.15
OggVisitor.hxx
Go to the documentation of this file.
1 /*
2  * Copyright 2003-2017 The Music Player Daemon Project
3  * http://www.musicpd.org
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License along
16  * with this program; if not, write to the Free Software Foundation, Inc.,
17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18  */
19 
20 #ifndef MPD_OGG_VISITOR_HXX
21 #define MPD_OGG_VISITOR_HXX
22 
23 #include "check.h"
24 #include "OggSyncState.hxx"
25 #include "OggStreamState.hxx"
26 
27 #include <ogg/ogg.h>
28 
29 #include <stddef.h>
30 
31 class Reader;
32 
37 class OggVisitor {
38  OggSyncState sync;
39  OggStreamState stream;
40 
41  bool has_stream = false;
42 
43 public:
44  explicit OggVisitor(Reader &reader)
45  :sync(reader), stream(0) {}
46 
47  long GetSerialNo() const {
48  return stream.GetSerialNo();
49  }
50 
51  void Visit();
52 
56  void PostSeek();
57 
58 private:
59  void EndStream();
60  bool ReadNextPage();
61  void HandlePacket(const ogg_packet &packet);
62  void HandlePackets();
63 
64 protected:
65  virtual void OnOggBeginning(const ogg_packet &packet) = 0;
66  virtual void OnOggPacket(const ogg_packet &packet) = 0;
67  virtual void OnOggEnd() = 0;
68 };
69 
70 #endif
An interface that can read bytes from a stream until the stream ends.
Definition: Reader.hxx:35
OggVisitor(Reader &reader)
Definition: OggVisitor.hxx:44
virtual void OnOggEnd()=0
void PostSeek()
Call this method after seeking the Reader.
virtual void OnOggPacket(const ogg_packet &packet)=0
void Visit()
long GetSerialNo() const
Definition: OggVisitor.hxx:47
Abstract class which iterates over Ogg packets in a Reader.
Definition: OggVisitor.hxx:37
virtual void OnOggBeginning(const ogg_packet &packet)=0
long GetSerialNo() const
Wrapper for an ogg_sync_state.