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
|
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mp4_demuxer/ResourceStream.h"
namespace mp4_demuxer {
ResourceStream::ResourceStream(mozilla::MediaResource* aResource)
: mResource(aResource)
, mPinCount(0)
{
MOZ_ASSERT(aResource);
}
ResourceStream::~ResourceStream()
{
MOZ_ASSERT(mPinCount == 0);
}
bool
ResourceStream::ReadAt(int64_t aOffset, void* aBuffer, size_t aCount,
size_t* aBytesRead)
{
uint32_t sum = 0;
uint32_t bytesRead = 0;
do {
uint64_t offset = aOffset + sum;
char* buffer = reinterpret_cast<char*>(aBuffer) + sum;
uint32_t toRead = aCount - sum;
nsresult rv = mResource->ReadAt(offset, buffer, toRead, &bytesRead);
if (NS_FAILED(rv)) {
return false;
}
sum += bytesRead;
} while (sum < aCount && bytesRead > 0);
*aBytesRead = sum;
return true;
}
bool
ResourceStream::CachedReadAt(int64_t aOffset, void* aBuffer, size_t aCount,
size_t* aBytesRead)
{
nsresult rv = mResource->ReadFromCache(reinterpret_cast<char*>(aBuffer),
aOffset, aCount);
if (NS_FAILED(rv)) {
*aBytesRead = 0;
return false;
}
*aBytesRead = aCount;
return true;
}
bool
ResourceStream::Length(int64_t* aSize)
{
if (mResource->GetLength() < 0)
return false;
*aSize = mResource->GetLength();
return true;
}
} // namespace mp4_demuxer
|
