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
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
/* -*- 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/. */
#if !defined(NesteggPacketHolder_h_)
# define NesteggPacketHolder_h_
# include <deque>
# include <stdint.h>
# include "nsAutoRef.h"
# include "nestegg/nestegg.h"
namespace mozilla {
// Holds a nestegg_packet, and its file offset. This is needed so we
// know the offset in the file we've played up to, in order to calculate
// whether it's likely we can play through to the end without needing
// to stop to buffer, given the current download rate.
class NesteggPacketHolder {
public:
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(NesteggPacketHolder)
NesteggPacketHolder()
: mPacket(nullptr),
mOffset(-1),
mTimestamp(-1),
mDuration(-1),
mTrack(0),
mIsKeyframe(false) {}
bool Init(nestegg_packet* aPacket, int64_t aOffset, unsigned aTrack,
bool aIsKeyframe) {
uint64_t timestamp_ns;
if (nestegg_packet_tstamp(aPacket, ×tamp_ns) == -1) {
return false;
}
// We store the timestamp as signed microseconds so that it's easily
// comparable to other timestamps we have in the system.
mTimestamp = timestamp_ns / 1000;
mPacket = aPacket;
mOffset = aOffset;
mTrack = aTrack;
mIsKeyframe = aIsKeyframe;
uint64_t duration_ns;
if (!nestegg_packet_duration(aPacket, &duration_ns)) {
mDuration = duration_ns / 1000;
}
return true;
}
nestegg_packet* Packet() {
MOZ_ASSERT(IsInitialized());
return mPacket;
}
int64_t Offset() {
MOZ_ASSERT(IsInitialized());
return mOffset;
}
int64_t Timestamp() {
MOZ_ASSERT(IsInitialized());
return mTimestamp;
}
int64_t Duration() {
MOZ_ASSERT(IsInitialized());
return mDuration;
}
unsigned Track() {
MOZ_ASSERT(IsInitialized());
return mTrack;
}
bool IsKeyframe() {
MOZ_ASSERT(IsInitialized());
return mIsKeyframe;
}
private:
~NesteggPacketHolder() { nestegg_free_packet(mPacket); }
bool IsInitialized() { return mOffset >= 0; }
nestegg_packet* mPacket;
// Offset in bytes. This is the offset of the end of the Block
// which contains the packet.
int64_t mOffset;
// Packet presentation timestamp in microseconds.
int64_t mTimestamp;
// Packet duration in microseconds; -1 if unknown or retrieval failed.
int64_t mDuration;
// Track ID.
unsigned mTrack;
// Does this packet contain a keyframe?
bool mIsKeyframe;
// Copy constructor and assignment operator not implemented. Don't use them!
NesteggPacketHolder(const NesteggPacketHolder& aOther);
NesteggPacketHolder& operator=(NesteggPacketHolder const& aOther);
};
// Queue for holding nestegg packets.
class WebMPacketQueue {
public:
int32_t GetSize() { return mQueue.size(); }
void Push(NesteggPacketHolder* aItem) { mQueue.push_back(aItem); }
void PushFront(NesteggPacketHolder* aItem) {
mQueue.push_front(std::move(aItem));
}
already_AddRefed<NesteggPacketHolder> PopFront() {
RefPtr<NesteggPacketHolder> result = std::move(mQueue.front());
mQueue.pop_front();
return result.forget();
}
void Reset() {
while (!mQueue.empty()) {
mQueue.pop_front();
}
}
private:
std::deque<RefPtr<NesteggPacketHolder>> mQueue;
};
} // namespace mozilla
#endif
|
