-
Notifications
You must be signed in to change notification settings - Fork 1
/
reader.go
186 lines (166 loc) · 4.61 KB
/
reader.go
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
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
package rtmp
import (
"bufio"
"context"
"io"
"github.com/pkg/errors"
"go.uber.org/zap"
)
type Reader interface {
io.Reader
ReadMessage() (Message, error)
SetChunkSize(chunkSize uint32)
AbortMessage(chunkStreamID uint32)
SetBandwidthLimitType(bandwidthLimitType BandwidthLimitType)
SetAcknowledgementWindowSize(acknowledgementWindowSize uint32)
CreateStream() (streamID uint32)
}
type reader Reader
type defaultReader struct {
conn Conn
r *bufio.Reader
chunkSize uint32
chunkStreams map[ /* chunkStreamID */ uint32]chunkStream
bandwidthLimitType BandwidthLimitType
acknowledgementWindowSize uint32
preAcknowledgementThreshold uint32
sequenceNumber uint32
logger *zap.Logger
}
func NewDefaultReader(
conn Conn,
r io.Reader,
acknowledgementWindowSize uint32,
logger *zap.Logger,
) Reader {
return &defaultReader{
conn: conn,
r: bufio.NewReader(r),
chunkSize: 128, /* default RTMP Chunk size */
chunkStreams: map[uint32]chunkStream{},
acknowledgementWindowSize: acknowledgementWindowSize,
logger: logger,
}
}
func (r *defaultReader) Read(p []byte) (n int, err error) {
return r.r.Read(p)
}
func (y *defaultReader) ReadMessage() (Message, error) {
r := y.r
for {
h, err := ReadChunkHeader(r)
if err != nil {
return nil, errors.Wrap(err, "failed to ReadChunkHeader")
}
csID := h.BasicHeader().ChunkStreamID()
cs := y.chunkStreams[csID]
switch mh := h.MessageHeader().(type) {
case ChunkMessageHeaderType0:
cs.messageLength = mh.MessageLength()
cs.messageTypeID = mh.MessageTypeID()
cs.messageStreamID = mh.MessageStreamID()
cs.timestampDelta = 0
cs.timestamp = mh.Timestamp()
if uint32(len(cs.buffer)) < cs.messageLength {
cs.buffer = make([]byte, cs.messageLength)
}
y.sequenceNumber += 11
case ChunkMessageHeaderType1:
cs.messageLength = mh.MessageLength()
cs.messageTypeID = mh.MessageTypeID()
cs.timestampDelta = mh.TimestampDelta()
cs.timestamp += cs.timestampDelta
if uint32(len(cs.buffer)) < cs.messageLength {
cs.buffer = make([]byte, cs.messageLength)
}
y.sequenceNumber += 7
case ChunkMessageHeaderType2:
cs.timestampDelta = mh.TimestampDelta()
cs.timestamp += cs.timestampDelta
y.sequenceNumber += 3
case ChunkMessageHeaderType3:
if cs.buffered == 0 {
cs.timestamp += cs.timestampDelta
}
}
switch h.BasicHeader().(type) {
case ChunkBasicHeader1B:
y.sequenceNumber += 1
case ChunkBasicHeader2B:
y.sequenceNumber += 2
default:
y.sequenceNumber += 3
}
if cs.messageLength == 0 {
y.sendAcknowledgementIfNeeded()
m := NewMessage(
csID,
cs.messageTypeID,
cs.timestamp,
cs.messageStreamID,
cs.buffer[:cs.messageLength],
)
cs.buffered = 0
y.chunkStreams[csID] = cs
return m, nil
}
length := cs.messageLength - cs.buffered
if length > y.chunkSize {
length = y.chunkSize
}
b := cs.buffer[cs.buffered : cs.buffered+length]
if _, err := io.ReadFull(r, b); err != nil {
return nil, errors.Wrapf(err, "failed to ReadBody: chunkStream=%+v: reader=%+v", cs, r)
}
cs.buffered += length
y.sequenceNumber += length
y.sendAcknowledgementIfNeeded()
if cs.buffered == cs.messageLength {
m := NewMessage(
csID,
cs.messageTypeID,
cs.timestamp,
cs.messageStreamID,
cs.buffer[:cs.messageLength],
)
cs.buffered = 0
y.chunkStreams[csID] = cs
return m, nil
}
y.chunkStreams[csID] = cs
}
}
func (r *defaultReader) SetChunkSize(chunkSize uint32) {
r.chunkSize = chunkSize
}
func (r *defaultReader) AbortMessage(chunkStreamID uint32) {
delete(r.chunkStreams, chunkStreamID)
}
func (r *defaultReader) SetBandwidthLimitType(bandwidthLimitType BandwidthLimitType) {
r.bandwidthLimitType = bandwidthLimitType
}
func (r *defaultReader) SetAcknowledgementWindowSize(acknowledgementWindowSize uint32) {
r.acknowledgementWindowSize = acknowledgementWindowSize
}
func (r *defaultReader) sendAcknowledgementIfNeeded() {
if r.sequenceNumber >= r.preAcknowledgementThreshold+r.acknowledgementWindowSize {
if err := r.conn.Acknowledgement(context.TODO(), r.sequenceNumber); err != nil {
r.logger.Error(
"failed to send Acknowledgement",
zap.Error(err),
)
return
}
r.preAcknowledgementThreshold += r.acknowledgementWindowSize
}
}
func (r *defaultReader) CreateStream() (streamID uint32) {
for i := uint32(3); true; i++ {
if _, ok := r.chunkStreams[i]; !ok {
r.chunkStreams[i] = chunkStream{ID: i}
return i
}
}
// dummy
return 0
}