install go2rtc on bob

installs_on_host/go2rtc/pkg/bits/reader.go

@@ -0,0 +1,143 @@
+package bits
+
+type Reader struct {
+	EOF bool // if end of buffer raised during reading
+
+	buf  []byte // total buf
+	byte byte   // current byte
+	bits byte   // bits left in byte
+	pos  int    // current pos in buf
+}
+
+func NewReader(b []byte) *Reader {
+	return &Reader{buf: b}
+}
+
+//goland:noinspection GoStandardMethods
+func (r *Reader) ReadByte() byte {
+	if r.bits != 0 {
+		return r.ReadBits8(8)
+	}
+
+	if r.pos >= len(r.buf) {
+		r.EOF = true
+		return 0
+	}
+
+	b := r.buf[r.pos]
+	r.pos++
+	return b
+}
+
+func (r *Reader) ReadUint16() uint16 {
+	if r.bits != 0 {
+		return r.ReadBits16(16)
+	}
+	return uint16(r.ReadByte())<<8 | uint16(r.ReadByte())
+}
+
+func (r *Reader) ReadUint24() uint32 {
+	if r.bits != 0 {
+		return r.ReadBits(24)
+	}
+	return uint32(r.ReadByte())<<16 | uint32(r.ReadByte())<<8 | uint32(r.ReadByte())
+}
+
+func (r *Reader) ReadUint32() uint32 {
+	if r.bits != 0 {
+		return r.ReadBits(32)
+	}
+	return uint32(r.ReadByte())<<24 | uint32(r.ReadByte())<<16 | uint32(r.ReadByte())<<8 | uint32(r.ReadByte())
+}
+
+func (r *Reader) ReadBit() byte {
+	if r.bits == 0 {
+		r.byte = r.ReadByte()
+		r.bits = 7
+	} else {
+		r.bits--
+	}
+
+	return (r.byte >> r.bits) & 0b1
+}
+
+func (r *Reader) ReadBits(n byte) (res uint32) {
+	for i := n - 1; i != 255; i-- {
+		res |= uint32(r.ReadBit()) << i
+	}
+	return
+}
+
+func (r *Reader) ReadBits8(n byte) (res uint8) {
+	for i := n - 1; i != 255; i-- {
+		res |= r.ReadBit() << i
+	}
+	return
+}
+
+func (r *Reader) ReadBits16(n byte) (res uint16) {
+	for i := n - 1; i != 255; i-- {
+		res |= uint16(r.ReadBit()) << i
+	}
+	return
+}
+
+func (r *Reader) ReadBits64(n byte) (res uint64) {
+	for i := n - 1; i != 255; i-- {
+		res |= uint64(r.ReadBit()) << i
+	}
+	return
+}
+
+func (r *Reader) ReadFloat32() float64 {
+	i := r.ReadUint16()
+	f := r.ReadUint16()
+	return float64(i) + float64(f)/65536
+}
+
+func (r *Reader) ReadBytes(n int) (b []byte) {
+	if r.bits == 0 {
+		if r.pos+n > len(r.buf) {
+			r.EOF = true
+			return nil
+		}
+
+		b = r.buf[r.pos : r.pos+n]
+		r.pos += n
+	} else {
+		b = make([]byte, n)
+		for i := 0; i < n; i++ {
+			b[i] = r.ReadByte()
+		}
+	}
+
+	return
+}
+
+// ReadUEGolomb - ReadExponentialGolomb (unsigned)
+func (r *Reader) ReadUEGolomb() uint32 {
+	var size byte
+	for size = 0; size < 32; size++ {
+		if b := r.ReadBit(); b != 0 || r.EOF {
+			break
+		}
+	}
+	return r.ReadBits(size) + (1 << size) - 1
+}
+
+// ReadSEGolomb - ReadSignedExponentialGolomb
+func (r *Reader) ReadSEGolomb() int32 {
+	if b := r.ReadUEGolomb(); b%2 == 0 {
+		return -int32(b / 2)
+	} else {
+		return int32((b + 1) / 2)
+	}
+}
+
+func (r *Reader) Left() []byte {
+	return r.buf[r.pos:]
+}
+
+func (r *Reader) Pos() (int, byte) {
+	return r.pos - 1, r.bits
+}

installs_on_host/go2rtc/pkg/bits/writer.go

@@ -0,0 +1,95 @@
+package bits
+
+type Writer struct {
+	buf  []byte // total buf
+	byte *byte  // pointer to current byte
+	bits byte   // bits left in byte
+}
+
+func NewWriter(buf []byte) *Writer {
+	return &Writer{buf: buf}
+}
+
+//goland:noinspection GoStandardMethods
+func (w *Writer) WriteByte(b byte) {
+	if w.bits != 0 {
+		w.WriteBits8(b, 8)
+	}
+
+	w.buf = append(w.buf, b)
+}
+
+func (w *Writer) WriteBit(b byte) {
+	if w.bits == 0 {
+		w.buf = append(w.buf, 0)
+		w.byte = &w.buf[len(w.buf)-1]
+		w.bits = 7
+	} else {
+		w.bits--
+	}
+
+	*w.byte |= (b & 1) << w.bits
+}
+
+func (w *Writer) WriteBits(v uint32, n byte) {
+	for i := n - 1; i != 255; i-- {
+		w.WriteBit(byte(v>>i) & 0b1)
+	}
+}
+
+func (w *Writer) WriteBits16(v uint16, n byte) {
+	for i := n - 1; i != 255; i-- {
+		w.WriteBit(byte(v>>i) & 0b1)
+	}
+}
+
+func (w *Writer) WriteBits8(v, n byte) {
+	for i := n - 1; i != 255; i-- {
+		w.WriteBit((v >> i) & 0b1)
+	}
+}
+
+func (w *Writer) WriteAllBits(bit, n byte) {
+	for i := byte(0); i < n; i++ {
+		w.WriteBit(bit)
+	}
+}
+
+func (w *Writer) WriteBool(b bool) {
+	if b {
+		w.WriteBit(1)
+	} else {
+		w.WriteBit(0)
+	}
+}
+
+func (w *Writer) WriteUint16(v uint16) {
+	if w.bits != 0 {
+		w.WriteBits16(v, 16)
+	}
+
+	w.buf = append(w.buf, byte(v>>8), byte(v))
+}
+
+func (w *Writer) WriteBytes(bytes ...byte) {
+	if w.bits != 0 {
+		for _, b := range bytes {
+			w.WriteByte(b)
+		}
+	}
+
+	w.buf = append(w.buf, bytes...)
+}
+
+func (w *Writer) Bytes() []byte {
+	return w.buf
+}
+
+func (w *Writer) Len() int {
+	return len(w.buf)
+}
+
+func (w *Writer) Reset() {
+	w.buf = w.buf[:0]
+	w.bits = 0
+}