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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,199 @@ | ||
| package y4m | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "bytes" | ||
| "errors" | ||
| "image" | ||
| "io" | ||
|
|
||
| "github.com/AlexxIT/go2rtc/pkg/core" | ||
| "github.com/pion/rtp" | ||
| ) | ||
|
|
||
| const FourCC = "YUV4" | ||
|
|
||
| func Open(r io.Reader) (*Producer, error) { | ||
| rd := bufio.NewReaderSize(r, core.BufferSize) | ||
| b, err := rd.ReadBytes('\n') | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| b = b[:len(b)-1] // remove \n | ||
|
|
||
| sdp := string(b) | ||
| var fmtp string | ||
|
|
||
| for b != nil { | ||
| // YUV4MPEG2 W1280 H720 F24:1 Ip A1:1 C420mpeg2 XYSCSS=420MPEG2 | ||
| // https://manned.org/yuv4mpeg.5 | ||
| // https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/yuv4mpegenc.c | ||
| key := b[0] | ||
| var value string | ||
| if i := bytes.IndexByte(b, ' '); i > 0 { | ||
| value = string(b[1:i]) | ||
| b = b[i+1:] | ||
| } else { | ||
| value = string(b[1:]) | ||
| b = nil | ||
| } | ||
|
|
||
| switch key { | ||
| case 'W': | ||
| fmtp = "width=" + value | ||
| case 'H': | ||
| fmtp += ";height=" + value | ||
| case 'C': | ||
| fmtp += ";colorspace=" + value | ||
| } | ||
| } | ||
|
|
||
| if GetSize(fmtp) == 0 { | ||
| return nil, errors.New("y4m: unsupported format: " + sdp) | ||
| } | ||
|
|
||
| prod := &Producer{rd: rd, cl: r.(io.Closer)} | ||
| prod.Type = "YUV4MPEG2 producer" | ||
| prod.SDP = sdp | ||
| prod.Medias = []*core.Media{ | ||
| { | ||
| Kind: core.KindVideo, | ||
| Direction: core.DirectionRecvonly, | ||
| Codecs: []*core.Codec{ | ||
| { | ||
| Name: core.CodecRAW, | ||
| ClockRate: 90000, | ||
| FmtpLine: fmtp, | ||
| PayloadType: core.PayloadTypeRAW, | ||
| }, | ||
| }, | ||
| }, | ||
| } | ||
|
|
||
| return prod, nil | ||
| } | ||
|
|
||
| type Producer struct { | ||
| core.SuperProducer | ||
| rd *bufio.Reader | ||
| cl io.Closer | ||
| } | ||
|
|
||
| func (c *Producer) Start() error { | ||
| size := GetSize(c.Medias[0].Codecs[0].FmtpLine) | ||
|
|
||
| for { | ||
| // FRAME\n | ||
| if _, err := c.rd.Discard(6); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| frame := make([]byte, size) | ||
| if _, err := io.ReadFull(c.rd, frame); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| c.Recv += size | ||
|
|
||
| if len(c.Receivers) == 0 { | ||
| continue | ||
| } | ||
|
|
||
| pkt := &rtp.Packet{ | ||
| Header: rtp.Header{Timestamp: core.Now90000()}, | ||
| Payload: frame, | ||
| } | ||
| c.Receivers[0].WriteRTP(pkt) | ||
| } | ||
| } | ||
|
|
||
| func (c *Producer) Stop() error { | ||
| _ = c.SuperProducer.Close() | ||
| return c.cl.Close() | ||
| } | ||
|
|
||
| func GetSize(fmtp string) int { | ||
| w := core.Atoi(core.Between(fmtp, "width=", ";")) | ||
| h := core.Atoi(core.Between(fmtp, "height=", ";")) | ||
|
|
||
| switch core.Between(fmtp, "colorspace=", ";") { | ||
| case "mono": | ||
| return w * h | ||
| case "420mpeg2", "420jpeg": | ||
| return w * h * 3 / 2 | ||
| case "422": | ||
| return w * h * 2 | ||
| case "444": | ||
| return w * h * 3 | ||
| } | ||
|
|
||
| return 0 | ||
| } | ||
|
|
||
| func NewImage(fmtp string) func(frame []byte) image.Image { | ||
| w := core.Atoi(core.Between(fmtp, "width=", ";")) | ||
| h := core.Atoi(core.Between(fmtp, "height=", ";")) | ||
| rect := image.Rect(0, 0, w, h) | ||
|
|
||
| switch core.Between(fmtp, "colorspace=", ";") { | ||
| case "mono": | ||
| return func(frame []byte) image.Image { | ||
| return &image.Gray{ | ||
| Pix: frame, | ||
| Stride: w, | ||
| Rect: rect, | ||
| } | ||
| } | ||
| case "420mpeg2", "420jpeg": | ||
| i1 := w * h | ||
| i2 := i1 + i1/4 | ||
| i3 := i2 + i1/4 | ||
|
|
||
| return func(frame []byte) image.Image { | ||
| return &image.YCbCr{ | ||
| Y: frame[:i1], | ||
| Cb: frame[i1:i2], | ||
| Cr: frame[i2:i3], | ||
| YStride: w, | ||
| CStride: w / 2, | ||
| SubsampleRatio: image.YCbCrSubsampleRatio420, | ||
| Rect: rect, | ||
| } | ||
| } | ||
| case "422": | ||
| i1 := w * h | ||
| i2 := i1 + i1/2 | ||
| i3 := i2 + i1/2 | ||
|
|
||
| return func(frame []byte) image.Image { | ||
| return &image.YCbCr{ | ||
| Y: frame[:i1], | ||
| Cb: frame[i1:i2], | ||
| Cr: frame[i2:i3], | ||
| YStride: w, | ||
| CStride: w / 2, | ||
| SubsampleRatio: image.YCbCrSubsampleRatio422, | ||
| Rect: rect, | ||
| } | ||
| } | ||
| case "444": | ||
| i1 := w * h | ||
| i2 := i1 + i1 | ||
| i3 := i2 + i1 | ||
|
|
||
| return func(frame []byte) image.Image { | ||
| return &image.YCbCr{ | ||
| Y: frame[:i1], | ||
| Cb: frame[i1:i2], | ||
| Cr: frame[i2:i3], | ||
| YStride: w, | ||
| CStride: w, | ||
| SubsampleRatio: image.YCbCrSubsampleRatio444, | ||
| Rect: rect, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } |