// Read reads the appropriate number of bytes and deserializes the BasicHeader
// from the given io.Reader. If an error is encoutnered along the way, it is
// returned immediately, and the basic header is assumed NOT to be read
// correctly.
func (h *BasicHeader) Read(r io.Reader) error {
b, err := spec.ReadByte(r)
if err != nil {
return err
}
h.FormatId = b >> 6
if b&0x3f == 0x3f {
tail, err := spec.ReadBytes(r, int(2))
if err != nil {
return err
}
h.StreamId = spec.Uint32(tail) + 64
} else if b&0x3f == 0 {
tail, err := spec.ReadBytes(r, int(1))
if err != nil {
return err
}
h.StreamId = spec.Uint32(tail) + 64
} else {
h.StreamId = spec.Uint32([]byte{b & 0x3f})
}
return nil
}
// Read slurps four bytes off of the given reader and parses the Delta field out
// as an unsigned, 32-bit integer.
func (t *ExtendedTimestamp) Read(r io.Reader) error {
buf, err := spec.ReadBytes(r, 4)
if err != nil {
return err
}
t.Delta = spec.Uint32(buf)
return nil
}
func (c *WindowAckSize) Read(r io.Reader) error {
buf, err := spec.ReadBytes(r, 4)
if err != nil {
return err
}
c.WindowAckSize = spec.Uint32(buf)
return nil
}
func (c *AbortMessage) Read(r io.Reader) error {
buf, err := spec.ReadBytes(r, 4)
if err != nil {
return err
}
c.ChunkStreamId = spec.Uint32(buf)
return nil
}
func (c *Acknowledgement) Read(r io.Reader) error {
buf, err := spec.ReadBytes(r, 4)
if err != nil {
return err
}
c.SequenceNumber = spec.Uint32(buf)
return nil
}
func (c *SetChunkSize) Read(r io.Reader) error {
buf, err := spec.ReadBytes(r, 4)
if err != nil {
return err
}
c.chunkSize = spec.Uint32(buf)
return nil
}
func (c *SetPeerBandwidth) Read(r io.Reader) error {
buf, err := spec.ReadBytes(r, 5)
if err != nil {
return err
}
c.AckWindowSize = spec.Uint32(buf[:4])
c.LimitType = LimitType(buf[4])
return nil
}
// Read reads a type 0, 1, 2, or 3-format MessageHeader from the given
// io.Reader, using a process as defined in the RTMP specification.
func (m *MessageHeader) Read(r io.Reader) error {
switch m.FormatId {
case 0:
buf, err := spec.ReadBytes(r, 11)
if err != nil {
return err
}
m.Timestamp = spec.Uint32(buf[:3])
m.TimestampDelta = false
m.Length = spec.Uint32(buf[3:6])
m.TypeId = buf[6]
m.StreamId = spec.LittleEndianUint32(buf[7:])
case 1:
buf, err := spec.ReadBytes(r, 7)
if err != nil {
return err
}
m.Timestamp = spec.Uint32(buf[:3])
m.TimestampDelta = true
m.Length = spec.Uint32(buf[3:6])
m.TypeId = buf[6]
case 2:
buf, err := spec.ReadBytes(r, 3)
if err != nil {
return err
}
m.Timestamp = spec.Uint32(buf)
m.TimestampDelta = true
case 3:
return nil
default:
return ErrUnknownFormatId
}
return nil
}