forked from pion/mediadevices
-
Notifications
You must be signed in to change notification settings - Fork 0
/
x264.go
152 lines (129 loc) · 3.31 KB
/
x264.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
// Package x264 implements H264 encoder.
// This package requires libx264 headers and libraries to be built.
// Reference: https://code.videolan.org/videolan/x264/blob/master/example.c
package x264
// #cgo pkg-config: x264
// #include "bridge.h"
import "C"
import (
"fmt"
"image"
"io"
"sync"
"unsafe"
"github.com/carbonrobotics/mediadevices/pkg/codec"
"github.com/carbonrobotics/mediadevices/pkg/io/video"
"github.com/carbonrobotics/mediadevices/pkg/prop"
)
type encoder struct {
engine *C.Encoder
r video.Reader
mu sync.Mutex
closed bool
}
type cerror int
func (e cerror) Error() string {
switch e {
case C.ERR_DEFAULT_PRESET:
return errDefaultPreset.Error()
case C.ERR_APPLY_PROFILE:
return errApplyProfile.Error()
case C.ERR_ALLOC_PICTURE:
return errAllocPicture.Error()
case C.ERR_OPEN_ENGINE:
return errOpenEngine.Error()
case C.ERR_ENCODE:
return errEncode.Error()
default:
return "unknown error"
}
}
func errFromC(rc C.int) error {
if rc == 0 {
return nil
}
return cerror(rc)
}
var (
errInitEngine = fmt.Errorf("failed to initialize x264")
errDefaultPreset = fmt.Errorf("failed to set default preset")
errApplyProfile = fmt.Errorf("failed to apply profile")
errAllocPicture = fmt.Errorf("failed to alloc picture")
errOpenEngine = fmt.Errorf("failed to open x264")
errEncode = fmt.Errorf("failed to encode")
)
func newEncoder(r video.Reader, p prop.Media, params Params) (codec.ReadCloser, error) {
if params.KeyFrameInterval == 0 {
params.KeyFrameInterval = 60
}
// Convert from bit/s to kbit/s because x264 uses kbit/s instead.
// Reference: https://code.videolan.org/videolan/x264/-/blob/7923c5818b50a3d8816eed222a7c43b418a73b36/encoder/ratecontrol.c#L657
params.BitRate /= 1000
param := C.x264_param_t{
i_csp: C.X264_CSP_I420,
i_width: C.int(p.Width),
i_height: C.int(p.Height),
i_keyint_max: C.int(params.KeyFrameInterval),
}
param.rc.i_bitrate = C.int(params.BitRate)
param.rc.i_vbv_max_bitrate = param.rc.i_bitrate
param.rc.i_vbv_buffer_size = param.rc.i_vbv_max_bitrate * 2
var rc C.int
// cPreset will be freed in C.enc_new
cPreset := C.CString(fmt.Sprint(params.Preset))
engine := C.enc_new(param, cPreset, &rc)
if err := errFromC(rc); err != nil {
return nil, err
}
e := encoder{
engine: engine,
r: video.ToI420(r),
}
return &e, nil
}
func (e *encoder) Read() ([]byte, func(), error) {
e.mu.Lock()
defer e.mu.Unlock()
if e.closed {
return nil, func() {}, io.EOF
}
img, release, err := e.r.Read()
if err != nil {
return nil, func() {}, err
}
defer release()
yuvImg := img.(*image.YCbCr)
var rc C.int
s := C.enc_encode(
e.engine,
(*C.uchar)(&yuvImg.Y[0]),
(*C.uchar)(&yuvImg.Cb[0]),
(*C.uchar)(&yuvImg.Cr[0]),
&rc,
)
if err := errFromC(rc); err != nil {
return nil, func() {}, err
}
encoded := C.GoBytes(unsafe.Pointer(s.data), s.data_len)
return encoded, func() {}, err
}
// TODO: Implement bit rate control
//var _ codec.BitRateController = (*encoder)(nil)
func (e *encoder) ForceKeyFrame() error {
e.engine.force_key_frame = C.int(1)
return nil
}
func (e *encoder) Controller() codec.EncoderController {
return e
}
func (e *encoder) Close() error {
e.mu.Lock()
defer e.mu.Unlock()
if e.closed {
return nil
}
var rc C.int
C.enc_close(e.engine, &rc)
e.closed = true
return nil
}