mirror of
https://github.com/aler9/gortsplib
synced 2025-10-05 15:16:51 +08:00
243 lines
6.6 KiB
Go
243 lines
6.6 KiB
Go
package rtpmjpeg
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import (
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"errors"
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"fmt"
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"time"
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"github.com/pion/rtp"
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"github.com/bluenviron/gortsplib/v3/pkg/codecs/jpeg"
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"github.com/bluenviron/gortsplib/v3/pkg/formats/rtpmjpeg/headers"
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"github.com/bluenviron/gortsplib/v3/pkg/rtptime"
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)
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// ErrMorePacketsNeeded is returned when more packets are needed.
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var ErrMorePacketsNeeded = errors.New("need more packets")
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// ErrNonStartingPacketAndNoPrevious is returned when we received a non-starting
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// fragment of an image and we didn't received anything before.
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// It's normal to receive this when we are decoding a stream that has been already
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// running for some time.
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var ErrNonStartingPacketAndNoPrevious = errors.New(
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"received a non-starting fragment without any previous starting fragment")
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var lumDcCodeLens = []byte{
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0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0,
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}
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var lumDcSymbols = []byte{
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
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}
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var lumAcCodelens = []byte{
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0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d,
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}
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var lumAcSymbols = []byte{ //nolint:dupl
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0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
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0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
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0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
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0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
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0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
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0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
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0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
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0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
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0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
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0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
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0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
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0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
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0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
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0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
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0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
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0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
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0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
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0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
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0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
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0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
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0xf9, 0xfa,
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}
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var chmDcCodelens = []byte{
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0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
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}
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var chmDcSymbols = []byte{
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
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}
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var chmAcCodelens = []byte{
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0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77,
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}
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var chmAcSymbols = []byte{ //nolint:dupl
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0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
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0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
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0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
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0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
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0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
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0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
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0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
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0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
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0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
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0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
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0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
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0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
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0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
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0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
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0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
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0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
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0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
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0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
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0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
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0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
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0xf9, 0xfa,
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}
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// Decoder is a RTP/M-JPEG decoder.
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type Decoder struct {
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timeDecoder *rtptime.Decoder
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firstPacketReceived bool
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fragmentedSize int
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fragments [][]byte
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firstJpegHeader *headers.JPEG
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firstQTHeader *headers.QuantizationTable
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}
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// Init initializes the decoder.
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func (d *Decoder) Init() {
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d.timeDecoder = rtptime.NewDecoder(rtpClockRate)
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}
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// Decode decodes an image from a RTP/M-JPEG packet.
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func (d *Decoder) Decode(pkt *rtp.Packet) ([]byte, time.Duration, error) {
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byts := pkt.Payload
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var jh headers.JPEG
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n, err := jh.Unmarshal(byts)
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if err != nil {
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return nil, 0, err
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}
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byts = byts[n:]
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if jh.Width > maxDimension {
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return nil, 0, fmt.Errorf("Width of %d is not supported", jh.Width)
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}
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if jh.Height > maxDimension {
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return nil, 0, fmt.Errorf("Height of %d is not supported", jh.Height)
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}
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if jh.FragmentOffset == 0 {
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if jh.Quantization >= 128 {
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d.firstQTHeader = &headers.QuantizationTable{}
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n, err := d.firstQTHeader.Unmarshal(byts)
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if err != nil {
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return nil, 0, err
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}
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byts = byts[n:]
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} else {
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d.firstQTHeader = nil
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}
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d.fragments = d.fragments[:0] // discard pending fragmented packets
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d.fragmentedSize = len(byts)
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d.fragments = append(d.fragments, byts)
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d.firstJpegHeader = &jh
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d.firstPacketReceived = true
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} else {
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if len(d.fragments) == 0 {
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if !d.firstPacketReceived {
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return nil, 0, ErrNonStartingPacketAndNoPrevious
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}
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return nil, 0, fmt.Errorf("received a non-starting fragment")
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}
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if int(jh.FragmentOffset) != d.fragmentedSize {
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d.fragments = d.fragments[:0] // discard pending fragmented packets
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return nil, 0, fmt.Errorf("received wrong fragment")
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}
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d.fragmentedSize += len(byts)
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d.fragments = append(d.fragments, byts)
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}
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if !pkt.Marker {
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return nil, 0, ErrMorePacketsNeeded
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}
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if d.fragmentedSize < 2 {
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return nil, 0, fmt.Errorf("invalid data")
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}
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data := make([]byte, d.fragmentedSize)
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pos := 0
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for _, frag := range d.fragments {
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pos += copy(data[pos:], frag)
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}
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d.fragments = d.fragments[:0]
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var buf []byte
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buf = jpeg.StartOfImage{}.Marshal(buf)
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var dqt jpeg.DefineQuantizationTable
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id := uint8(0)
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for i := 0; i < len(d.firstQTHeader.Tables); i += 64 {
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dqt.Tables = append(dqt.Tables, jpeg.QuantizationTable{
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ID: id,
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Data: d.firstQTHeader.Tables[i : i+64],
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})
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id++
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}
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buf = dqt.Marshal(buf)
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buf = jpeg.StartOfFrame1{
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Type: d.firstJpegHeader.Type,
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Width: d.firstJpegHeader.Width,
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Height: d.firstJpegHeader.Height,
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QuantizationTableCount: id,
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}.Marshal(buf)
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buf = jpeg.DefineHuffmanTable{
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Codes: lumDcCodeLens,
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Symbols: lumDcSymbols,
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TableNumber: 0,
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TableClass: 0,
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}.Marshal(buf)
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buf = jpeg.DefineHuffmanTable{
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Codes: lumAcCodelens,
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Symbols: lumAcSymbols,
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TableNumber: 0,
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TableClass: 1,
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}.Marshal(buf)
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buf = jpeg.DefineHuffmanTable{
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Codes: chmDcCodelens,
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Symbols: chmDcSymbols,
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TableNumber: 1,
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TableClass: 0,
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}.Marshal(buf)
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buf = jpeg.DefineHuffmanTable{
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Codes: chmAcCodelens,
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Symbols: chmAcSymbols,
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TableNumber: 1,
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TableClass: 1,
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}.Marshal(buf)
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buf = jpeg.StartOfScan{}.Marshal(buf)
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buf = append(buf, data...)
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if data[len(data)-2] != 0xFF || data[len(data)-1] != jpeg.MarkerEndOfImage {
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buf = append(buf, []byte{0xFF, jpeg.MarkerEndOfImage}...)
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}
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return buf, d.timeDecoder.Decode(pkt.Timestamp), nil
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}
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