func CreateEncoder(codec *Codec) *gmf.Encoder {
result := new(gmf.Encoder)
result.SetParameter("codecid", codec.Id)
for i := 0; i < len(codec.Param); i++ {
result.SetParameter(codec.Param[i].Name, codec.Param[i].Value)
}
return result
}
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)
}
}
}