Alexey Khit
372 lines
9.0 KiB
Go
372 lines
9.0 KiB
Go
package homekit
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import (
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"encoding/json"
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"errors"
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"fmt"
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"net"
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"net/url"
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"sync/atomic"
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"time"
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"github.com/AlexxIT/go2rtc/pkg/core"
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"github.com/AlexxIT/go2rtc/pkg/h264"
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"github.com/AlexxIT/go2rtc/pkg/hap"
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"github.com/AlexxIT/go2rtc/pkg/hap/camera"
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"github.com/AlexxIT/go2rtc/pkg/srtp"
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)
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type Client struct {
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core.Listener
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conn *hap.Client
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server *srtp.Server
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config *StreamConfig
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medias []*core.Media
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receivers []*core.Receiver
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sessions []*srtp.Session
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}
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type StreamConfig struct {
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Video camera.SupportedVideoStreamConfig
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Audio camera.SupportedAudioStreamConfig
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}
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func NewClient(rawURL string, server *srtp.Server) (*Client, error) {
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u, err := url.Parse(rawURL)
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if err != nil {
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return nil, err
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}
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query := u.Query()
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c := &hap.Client{
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DeviceAddress: u.Host,
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DeviceID: query.Get("device_id"),
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DevicePublic: hap.DecodeKey(query.Get("device_public")),
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ClientID: query.Get("client_id"),
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ClientPrivate: hap.DecodeKey(query.Get("client_private")),
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}
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return &Client{conn: c, server: server}, nil
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}
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func (c *Client) Dial() error {
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return c.conn.Dial()
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}
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func (c *Client) GetMedias() []*core.Media {
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if c.medias != nil {
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return c.medias
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}
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accs, err := c.conn.GetAccessories()
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if err != nil {
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return nil
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}
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acc := accs[0]
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c.config = &StreamConfig{}
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// get supported video config (not really necessary)
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char := acc.GetCharacter(camera.TypeSupportedVideoStreamConfiguration)
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if char == nil {
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return nil
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}
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if err = char.ReadTLV8(&c.config.Video); err != nil {
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return nil
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}
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for _, videoCodec := range c.config.Video.Codecs {
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var name string
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switch videoCodec.CodecType {
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case camera.VideoCodecTypeH264:
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name = core.CodecH264
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default:
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continue
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}
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for _, params := range videoCodec.CodecParams {
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codec := &core.Codec{
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Name: name,
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ClockRate: 90000,
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FmtpLine: "profile-level-id=",
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}
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switch params.ProfileID {
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case camera.VideoCodecProfileConstrainedBaseline:
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codec.FmtpLine += "4200" // 4240?
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case camera.VideoCodecProfileMain:
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codec.FmtpLine += "4D00" // 4D40?
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case camera.VideoCodecProfileHigh:
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codec.FmtpLine += "6400"
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default:
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continue
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}
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switch params.Level {
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case camera.VideoCodecLevel31:
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codec.FmtpLine += "1F"
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case camera.VideoCodecLevel32:
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codec.FmtpLine += "20"
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case camera.VideoCodecLevel40:
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codec.FmtpLine += "28"
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default:
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continue
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}
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media := &core.Media{
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Kind: core.KindVideo, Direction: core.DirectionRecvonly,
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Codecs: []*core.Codec{codec},
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}
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c.medias = append(c.medias, media)
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}
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}
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char = acc.GetCharacter(camera.TypeSupportedAudioStreamConfiguration)
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if char == nil {
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return nil
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}
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if err = char.ReadTLV8(&c.config.Audio); err != nil {
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return nil
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}
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for _, audioCodec := range c.config.Audio.Codecs {
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var name string
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switch audioCodec.CodecType {
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case camera.AudioCodecTypePCMU:
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name = core.CodecPCMU
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case camera.AudioCodecTypePCMA:
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name = core.CodecPCMA
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case camera.AudioCodecTypeAACELD:
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name = core.CodecELD
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case camera.AudioCodecTypeOpus:
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name = core.CodecOpus
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default:
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continue
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}
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for _, params := range audioCodec.CodecParams {
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codec := &core.Codec{
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Name: name,
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Channels: uint16(params.Channels),
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}
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if name == core.CodecELD {
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// only this value supported by FFmpeg
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codec.FmtpLine = "profile-level-id=1;mode=AAC-hbr;sizelength=13;indexlength=3;indexdeltalength=3;config=F8EC3000"
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}
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switch params.SampleRate {
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case camera.AudioCodecSampleRate8Khz:
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codec.ClockRate = 8000
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case camera.AudioCodecSampleRate16Khz:
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codec.ClockRate = 16000
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case camera.AudioCodecSampleRate24Khz:
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codec.ClockRate = 24000
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default:
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continue
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}
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media := &core.Media{
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Kind: core.KindAudio, Direction: core.DirectionRecvonly,
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Codecs: []*core.Codec{codec},
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}
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c.medias = append(c.medias, media)
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}
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}
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return c.medias
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}
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func (c *Client) GetTrack(media *core.Media, codec *core.Codec) (*core.Receiver, error) {
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for _, track := range c.receivers {
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if track.Codec == codec {
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return track, nil
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}
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}
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track := core.NewReceiver(media, codec)
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c.receivers = append(c.receivers, track)
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return track, nil
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}
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func (c *Client) Start() error {
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if c.receivers == nil {
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return errors.New("producer without tracks")
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}
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// get our server local IP-address
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host, _, err := net.SplitHostPort(c.conn.LocalAddr())
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if err != nil {
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return err
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}
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videoParams := &camera.SelectedVideoParams{
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CodecType: camera.VideoCodecTypeH264,
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VideoAttrs: camera.VideoAttrs{
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Width: 1920, Height: 1080, Framerate: 30,
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},
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}
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videoTrack := c.trackByKind(core.KindVideo)
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if videoTrack != nil {
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profile := h264.GetProfileLevelID(videoTrack.Codec.FmtpLine)
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switch profile[:2] {
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case "42":
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videoParams.CodecParams.ProfileID = camera.VideoCodecProfileConstrainedBaseline
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case "4D":
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videoParams.CodecParams.ProfileID = camera.VideoCodecProfileMain
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case "64":
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videoParams.CodecParams.ProfileID = camera.VideoCodecProfileHigh
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}
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switch profile[4:] {
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case "1F":
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videoParams.CodecParams.Level = camera.VideoCodecLevel31
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case "20":
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videoParams.CodecParams.Level = camera.VideoCodecLevel32
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case "28":
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videoParams.CodecParams.Level = camera.VideoCodecLevel40
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}
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} else {
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// if consumer don't need track - ask first track from camera
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codec0 := c.config.Video.Codecs[0]
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videoParams.CodecParams.ProfileID = codec0.CodecParams[0].ProfileID
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videoParams.CodecParams.Level = codec0.CodecParams[0].Level
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}
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audioParams := &camera.SelectedAudioParams{
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CodecParams: camera.AudioCodecParams{
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Bitrate: camera.AudioCodecBitrateVariable,
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// RTPTime=20 => AAC-ELD packet size=480
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// RTPTime=30 => AAC-ELD packet size=480
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// RTPTime=40 => AAC-ELD packet size=480
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// RTPTime=60 => AAC-LD packet size=960
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RTPTime: 40,
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},
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}
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audioTrack := c.trackByKind(core.KindAudio)
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if audioTrack != nil {
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audioParams.CodecParams.Channels = byte(audioTrack.Codec.Channels)
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switch audioTrack.Codec.Name {
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case core.CodecPCMU:
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audioParams.CodecType = camera.AudioCodecTypePCMU
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case core.CodecPCMA:
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audioParams.CodecType = camera.AudioCodecTypePCMA
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case core.CodecELD:
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audioParams.CodecType = camera.AudioCodecTypeAACELD
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case core.CodecOpus:
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audioParams.CodecType = camera.AudioCodecTypeOpus
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}
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switch audioTrack.Codec.ClockRate {
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case 8000:
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audioParams.CodecParams.SampleRate = camera.AudioCodecSampleRate8Khz
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case 16000:
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audioParams.CodecParams.SampleRate = camera.AudioCodecSampleRate16Khz
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case 24000:
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audioParams.CodecParams.SampleRate = camera.AudioCodecSampleRate24Khz
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}
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} else {
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// if consumer don't need track - ask first track from camera
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codec0 := c.config.Audio.Codecs[0]
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audioParams.CodecType = codec0.CodecType
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audioParams.CodecParams.Channels = codec0.CodecParams[0].Channels
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audioParams.CodecParams.SampleRate = codec0.CodecParams[0].SampleRate
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}
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// setup HomeKit stream session
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session := camera.NewSession(videoParams, audioParams)
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session.SetLocalEndpoint(host, c.server.Port())
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// create client for processing camera accessory
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cam := camera.NewClient(c.conn)
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// try to start HomeKit stream
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if err = cam.StartStream(session); err != nil {
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return err
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}
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// SRTP Video Session
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videoSession := &srtp.Session{
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LocalSSRC: session.Config.VideoParams.RTPParams.SSRC,
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RemoteSSRC: session.Answer.VideoSSRC,
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Track: videoTrack,
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}
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if err = videoSession.SetKeys(
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session.Offer.VideoCrypto.MasterKey, session.Offer.VideoCrypto.MasterSalt,
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session.Answer.VideoCrypto.MasterKey, session.Answer.VideoCrypto.MasterSalt,
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); err != nil {
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return err
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}
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// SRTP Audio Session
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audioSession := &srtp.Session{
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LocalSSRC: session.Config.AudioParams.RTPParams.SSRC,
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RemoteSSRC: session.Answer.AudioSSRC,
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Track: audioTrack,
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}
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if err = audioSession.SetKeys(
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session.Offer.AudioCrypto.MasterKey, session.Offer.AudioCrypto.MasterSalt,
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session.Answer.AudioCrypto.MasterKey, session.Answer.AudioCrypto.MasterSalt,
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); err != nil {
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return err
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}
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c.server.AddSession(videoSession)
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c.server.AddSession(audioSession)
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c.sessions = []*srtp.Session{videoSession, audioSession}
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if audioSession.Track != nil {
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audioSession.Deadline = time.NewTimer(core.ConnDeadline)
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<-audioSession.Deadline.C
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} else if videoSession.Track != nil {
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videoSession.Deadline = time.NewTimer(core.ConnDeadline)
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<-videoSession.Deadline.C
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}
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return nil
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}
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func (c *Client) Stop() error {
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for _, session := range c.sessions {
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c.server.RemoveSession(session)
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}
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return c.conn.Close()
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}
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func (c *Client) MarshalJSON() ([]byte, error) {
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var recv uint32
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for _, session := range c.sessions {
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recv += atomic.LoadUint32(&session.Recv)
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}
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info := &core.Info{
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Type: "HomeKit active producer",
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URL: c.conn.URL(),
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SDP: fmt.Sprintf("%+v", *c.config),
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Medias: c.medias,
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Receivers: c.receivers,
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Recv: int(recv),
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}
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return json.Marshal(info)
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}
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func (c *Client) trackByKind(kind string) *core.Receiver {
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for _, receiver := range c.receivers {
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if core.GetKind(receiver.Codec.Name) == kind {
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return receiver
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}
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}
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return nil
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}
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