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
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
/*****************************************************************************
* stream_io_callback.cpp : matroska demuxer
*****************************************************************************
* Copyright (C) 2003-2004, 2010 VLC authors and VideoLAN
* $Id: 4f2306b85c702db735287faa81e2cf0cdee7a782 $
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
* Steve Lhomme <steve.lhomme@free.fr>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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.
*****************************************************************************/
#include "stream_io_callback.hpp"
#include "matroska_segment.hpp"
#include "demux.hpp"
/*****************************************************************************
* Stream managment
*****************************************************************************/
vlc_stream_io_callback::vlc_stream_io_callback( stream_t *s_, bool b_owner_ )
: s( s_), b_owner( b_owner_ )
{
mb_eof = false;
}
uint32 vlc_stream_io_callback::read( void *p_buffer, size_t i_size )
{
if( i_size <= 0 || mb_eof )
return 0;
int i_ret = stream_Read( s, p_buffer, i_size );
return i_ret < 0 ? 0 : i_ret;
}
void vlc_stream_io_callback::setFilePointer(int64_t i_offset, seek_mode mode )
{
int64_t i_pos, i_size;
int64_t i_current = stream_Tell( s );
switch( mode )
{
case seek_beginning:
i_pos = i_offset;
break;
case seek_end:
i_pos = stream_Size( s ) - i_offset;
break;
default:
i_pos= i_current + i_offset;
break;
}
if(i_pos == i_current)
return;
if( i_pos < 0 || ( ( i_size = stream_Size( s ) ) != 0 && i_pos >= i_size ) )
{
mb_eof = true;
return;
}
mb_eof = false;
if( stream_Seek( s, i_pos ) )
{
mb_eof = true;
}
return;
}
uint64 vlc_stream_io_callback::getFilePointer( void )
{
if ( s == NULL )
return 0;
return stream_Tell( s );
}
size_t vlc_stream_io_callback::write(const void *, size_t )
{
return 0;
}
uint64 vlc_stream_io_callback::toRead( void )
{
uint64_t i_size;
if( s == NULL)
return 0;
i_size = stream_Size( s );
if( i_size <= 0 )
return UINT64_MAX;
return (uint64) i_size - stream_Tell( s );
}
|
