-
Notifications
You must be signed in to change notification settings - Fork 63
/
example_mux_mp4_memory_io.go
110 lines (103 loc) · 2.82 KB
/
example_mux_mp4_memory_io.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
package main
import (
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"github.com/yapingcat/gomedia/go-mp4"
"github.com/yapingcat/gomedia/go-mpeg2"
)
type cacheWriterSeeker struct {
buf []byte
offset int
}
func newCacheWriterSeeker(capacity int) *cacheWriterSeeker {
return &cacheWriterSeeker{
buf: make([]byte, 0, capacity),
offset: 0,
}
}
func (ws *cacheWriterSeeker) Write(p []byte) (n int, err error) {
if cap(ws.buf)-ws.offset >= len(p) {
if len(ws.buf) < ws.offset+len(p) {
ws.buf = ws.buf[:ws.offset+len(p)]
}
copy(ws.buf[ws.offset:], p)
ws.offset += len(p)
return len(p), nil
}
tmp := make([]byte, len(ws.buf), cap(ws.buf)+len(p)*2)
copy(tmp, ws.buf)
if len(ws.buf) < ws.offset+len(p) {
tmp = tmp[:ws.offset+len(p)]
}
copy(tmp[ws.offset:], p)
ws.buf = tmp
ws.offset += len(p)
return len(p), nil
}
func (ws *cacheWriterSeeker) Seek(offset int64, whence int) (int64, error) {
if whence == io.SeekCurrent {
if ws.offset+int(offset) > len(ws.buf) {
return -1, errors.New(fmt.Sprint("SeekCurrent out of range", len(ws.buf), offset, ws.offset))
}
ws.offset += int(offset)
return int64(ws.offset), nil
} else if whence == io.SeekStart {
if offset > int64(len(ws.buf)) {
return -1, errors.New(fmt.Sprint("SeekStart out of range", len(ws.buf), offset, ws.offset))
}
ws.offset = int(offset)
return offset, nil
} else {
return 0, errors.New("unsupport SeekEnd")
}
}
func main() {
tsfile := "demo.ts"
mp4FileName := "cache.mp4"
mp4File, err := os.OpenFile(mp4FileName, os.O_CREATE|os.O_RDWR, 0666)
if err != nil {
fmt.Println(err)
return
}
defer mp4File.Close()
fmt.Println(mp4File.Seek(0, io.SeekCurrent))
cws := newCacheWriterSeeker(4096)
muxer, err := mp4.CreateMp4Muxer(cws)
if err != nil {
fmt.Println(err)
return
}
vtid := muxer.AddVideoTrack(mp4.MP4_CODEC_H264)
buf, err := ioutil.ReadFile(tsfile)
if err != nil {
panic(err)
}
fmt.Printf("read %d size\n", len(buf))
demuxer := mpeg2.NewTSDemuxer()
demuxer.OnFrame = func(cid mpeg2.TS_STREAM_TYPE, frame []byte, pts uint64, dts uint64) {
if cid == mpeg2.TS_STREAM_H264 {
err = muxer.Write(vtid, frame, uint64(pts), uint64(dts))
if err != nil {
panic(err)
}
}
}
err = demuxer.Input(bytes.NewReader(buf))
if err != nil {
panic(err)
}
fmt.Println("write trailer")
err = muxer.WriteTrailer()
if err != nil {
panic(err)
}
_, err = mp4File.Write(cws.buf)
if err != nil {
panic(err)
}
fmt.Println(cws.offset, len(cws.buf))
}