blob: e20548dd2cf7b49f417cee29a58968d6888c7111 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
/*
* Copyright 2003-2018 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_OGG_VISITOR_HXX
#define MPD_OGG_VISITOR_HXX
#include "OggSyncState.hxx"
#include "OggStreamState.hxx"
#include <ogg/ogg.h>
#include <stddef.h>
class Reader;
/**
* Abstract class which iterates over Ogg packets in a #Reader.
* Subclass it and implement the virtual methods.
*/
class OggVisitor {
OggSyncState sync;
OggStreamState stream;
bool has_stream = false;
/**
* This is true after seeking; its one-time effect is to
* ignore the BOS packet, just in case we have been seeking to
* the beginning of the file, because that would disrupt
* playback.
*/
bool post_seek = false;
public:
explicit OggVisitor(Reader &reader)
:sync(reader), stream(0) {}
long GetSerialNo() const {
return stream.GetSerialNo();
}
void Visit();
/**
* Call this method after seeking the #Reader.
*/
void PostSeek();
private:
void EndStream();
bool ReadNextPage();
void HandlePacket(const ogg_packet &packet);
void HandlePackets();
protected:
/**
* Called when the "beginning of stream" packet has been seen.
*
* @param packet the "beginning of stream" packet
*/
virtual void OnOggBeginning(const ogg_packet &packet) = 0;
/**
* Called for each follow-up packet.
*/
virtual void OnOggPacket(const ogg_packet &packet) = 0;
/**
* Called after the "end of stream" packet has been processed.
*/
virtual void OnOggEnd() = 0;
};
#endif
|
