/
transcoder.go
138 lines (119 loc) · 3.45 KB
/
transcoder.go
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package main
import (
//"gmf.googlecode.com/hg/gmf"
"gmf"
"log"
"time"
"flag"
"fmt"
"os"
)
func process_track(track * gmf.Track, multiplexer * gmf.Multiplexer){
var encoder * gmf.Encoder
var resizer * gmf.Resizer
var resampler * gmf.Resampler
var rate_converter * gmf.FrameRateConverter
var deinterlacer * gmf.Deinterlacer
decoder:=track.GetDecoder()
decoder.SetParameter("request_channels","2")
decoder.SetParameter("request_channel_layout","2")
decoder.Open()
defer decoder.Close()
if(decoder.GetCodecType()==gmf.CODEC_TYPE_VIDEO){
encoder=new(gmf.Encoder)
encoder.SetParameter("codecid","mpeg4")
encoder.SetParameter("time_base","1/25")
encoder.SetParameter("b","512000")
encoder.SetParameter("width","320")
encoder.SetParameter("height","240")
encoder.SetParameter("flags","global_header")
encoder.Open()
defer encoder.Close()
resizer=new(gmf.Resizer)
resizer.Init(decoder, encoder)
defer resizer.Close()
rate_converter=new(gmf.FrameRateConverter)
rate_converter.Init(decoder.GetFrameRate(), encoder.GetFrameRate())
deinterlacer=new(gmf.Deinterlacer)
deinterlacer.Init(decoder)
multiplexer.AddTrack(encoder)
}
if(decoder.GetCodecType()==gmf.CODEC_TYPE_AUDIO){
encoder=new(gmf.Encoder)
encoder.SetParameter("codecid","mp2")
encoder.SetParameter("ab","128000")
encoder.SetParameter("ar","44100")
encoder.SetParameter("ac","2")
encoder.SetParameter("flags","global_header")
encoder.Open()
defer encoder.Close()
resampler=new(gmf.Resampler)
resampler.Init(decoder, encoder)
defer resampler.Close()
multiplexer.AddTrack(encoder)
}
p:=new(gmf.Packet)
for true {
//stream end reached break this loop, no more processing is needed
if(!track.ReadPacket(p)){
break
}
var frame * gmf.Frame
frame=decoder.Decode(p)
if(frame!=nil&&frame.IsFinished()&&encoder!=nil){
typ:=decoder.GetCodecType()
switch typ{
case gmf.CODEC_TYPE_VIDEO:
frame=deinterlacer.Deinterlace(frame)
frame=resizer.Resize(frame)
frame=rate_converter.Convert(frame)
case gmf.CODEC_TYPE_AUDIO:
frame=resampler.Resample(frame)
}
encoder.Encode(frame)
}
}
}
var inputfile *string = flag.String("i", "", "input file name")
var outfile *string = flag.String("o", "", "output file name")
var outformat *string = flag.String("f", "", "output file format")
func main(){
flag.Parse()
if(inputfile==nil){
fmt.Printf("no inputfile given")
os.Exit(1)
}
if(outfile==nil){
fmt.Printf("no outputfile given")
os.Exit(1)
}
//prepare the input file
source:=gmf.NewDataSource(gmf.MediaLocator{Filename:*inputfile})
err:=source.Connect()
if(err!=nil){
log.Printf("%s : %s\n", err,source.Locator.Filename)
os.Exit(1)
}
demultiplexer := gmf.NewDemultiplexer(source)
//prepare the output file
var sink = gmf.NewDatasink(gmf.MediaLocator{Filename:*outfile,Format:*outformat})
err=sink.Connect()
if(err!=nil){
log.Printf("%s : %s\n", err,sink.Locator.Filename)
os.Exit(1)
}
multiplexer := gmf.NewMultiplexer(sink)
//prepare processing each track
tracks:=demultiplexer.GetTracks()
for i:=0;i<len(tracks);i++ {
go process_track(&tracks[i], multiplexer)
}
time.Sleep(1000000000)
multiplexer.Start()
demultiplexer.Start()
time.Sleep(1000000000)
multiplexer.Stop()
demultiplexer.Stop()
source.Disconnect()
sink.Disconnect()
}