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slice.go
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slice.go
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package seed
import (
"context"
"errors"
"fmt"
"os"
"path/filepath"
"time"
"github.com/glvd/seed/model"
cmd "github.com/godcong/go-ffmpeg-cmd"
)
// Scale ...
type Scale int64
// HighScale ...
const HighScale Scale = 1080
// MiddleScale ...
const MiddleScale Scale = 720
// LowScale ...
const LowScale Scale = 480
// SliceCaller ...
type SliceCaller interface {
Call(*Slice) error
}
// Slice ...
type Slice struct {
*Thread
Scale Scale
SliceOutput string
SkipType []interface{}
SkipExist bool
SkipSlice bool
cb chan SliceCaller
}
// Push ...
func (s *Slice) Push(v interface{}) error {
return s.push(v)
}
// Option ...
func (s *Slice) Option(seed Seeder) {
sliceOption(s)(seed)
}
func sliceOption(slice *Slice) Options {
return func(seeder Seeder) {
seeder.SetBaseThread(StepperSlice, slice)
}
}
// Push ...
func (s *Slice) push(cb interface{}) error {
if v, b := cb.(SliceCaller); b {
s.cb <- v
return nil
}
return errors.New("not slice callback")
}
// NewSlice ...
func NewSlice() *Slice {
output := os.TempDir()
return &Slice{
SliceOutput: output,
cb: make(chan SliceCaller),
Thread: NewThread(),
}
}
// Run ...
func (s *Slice) Run(ctx context.Context) {
log.Info("slice running")
SliceEnd:
for {
select {
case <-ctx.Done():
break SliceEnd
case v := <-s.cb:
if v == nil {
break SliceEnd
}
s.SetState(StateRunning)
e := v.Call(s)
if e != nil {
log.Error(e)
}
case <-time.After(TimeOutLimit):
log.Info("slice time out")
s.SetState(StateWaiting)
}
}
close(s.cb)
s.Finished()
}
// GetFiles ...
func GetFiles(p string) (files []string) {
info, e := os.Stat(p)
if e != nil {
return nil
}
if info.IsDir() {
file, e := os.Open(p)
if e != nil {
return nil
}
defer file.Close()
names, e := file.Readdirnames(-1)
if e != nil {
return nil
}
var fullPath string
for _, name := range names {
fullPath = filepath.Join(p, name)
tmp := GetFiles(fullPath)
if tmp != nil {
files = append(files, tmp...)
}
}
return files
}
return append(files, p)
}
type unfinishedSlice struct {
unfinished *model.Unfinished
file string
}
// SliceCallbackFunc ...
type SliceCallbackFunc func(s *Slice, sa *cmd.SplitArgs, v interface{}) (e error)
// SliceCall ...
func SliceCall(file string, u *model.Unfinished, cb SliceCallbackFunc) (Stepper, SliceCaller) {
return StepperSlice, &sliceCall{
cb: cb,
unfinished: u,
file: file,
}
}
func scale(scale Scale) int {
switch scale {
case 480, 1080:
return int(scale)
default:
return 720
}
}
func scaleStr(s Scale) string {
return fmt.Sprintf("%dP", scale(s))
}
func isMedia(format *cmd.StreamFormat) bool {
video := format.Video()
audio := format.Audio()
if audio == nil || video == nil {
return false
}
return true
}
// Call ...
func (c *sliceCall) Call(s *Slice) (e error) {
sa, e := sliceVideo(s, c.file, c.unfinished)
if e != nil {
return e
}
return c.cb(s, sa, c.unfinished)
}
func sliceVideo(slice *Slice, file string, u *model.Unfinished) (sa *cmd.SplitArgs, e error) {
format, e := cmd.FFProbeStreamFormat(file)
if e != nil {
return nil, e
}
if !isMedia(format) {
return nil, errors.New("format video/audio not found")
}
u.Type = model.TypeSlice
s := slice.Scale
if s != 0 {
res := format.ResolutionInt()
if int64(res) < int64(s) {
s = Scale(res)
}
sa, e = cmd.FFMpegSplitToM3U8(nil, file, cmd.StreamFormatOption(format), cmd.ScaleOption(int64(s)), cmd.OutputOption(slice.SliceOutput))
u.Sharpness = scaleStr(s)
} else {
sa, e = cmd.FFMpegSplitToM3U8(nil, file, cmd.StreamFormatOption(format), cmd.OutputOption(slice.SliceOutput))
u.Sharpness = format.Resolution() + "P"
}
log.Infof("%+v", sa)
return
}
type sliceCall struct {
cb SliceCallbackFunc
unfinished *model.Unfinished
file string
}
var _ SliceCaller = &sliceCall{}