|
| 1 | +package sdk |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "encoding/json" |
| 6 | + "errors" |
| 7 | +) |
| 8 | + |
| 9 | +var errCameraMediaStreamNotInitialized = errors.New("camera media stream not initialized") |
| 10 | + |
| 11 | +// CameraMediaOpenRequest defines metadata needed to open a host camera media stream. |
| 12 | +type CameraMediaOpenRequest struct { |
| 13 | + TrackID string `json:"track_id,omitempty"` |
| 14 | + Codec string `json:"codec,omitempty"` |
| 15 | + PayloadFormat string `json:"payload_format,omitempty"` |
| 16 | +} |
| 17 | + |
| 18 | +// CameraMediaChunkMetadata describes an uploaded camera media chunk. |
| 19 | +type CameraMediaChunkMetadata struct { |
| 20 | + TrackID string `json:"track_id,omitempty"` |
| 21 | + Sequence uint64 `json:"sequence,omitempty"` |
| 22 | + PTS int64 `json:"pts,omitempty"` |
| 23 | + DTS int64 `json:"dts,omitempty"` |
| 24 | + Keyframe bool `json:"keyframe,omitempty"` |
| 25 | + IsFinal bool `json:"is_final,omitempty"` |
| 26 | + Codec string `json:"codec,omitempty"` |
| 27 | + PayloadFormat string `json:"payload_format,omitempty"` |
| 28 | +} |
| 29 | + |
| 30 | +// CameraMediaHeartbeat keeps a host camera media stream lease alive. |
| 31 | +type CameraMediaHeartbeat struct { |
| 32 | + Sequence uint64 `json:"sequence,omitempty"` |
| 33 | + TimestampUnix int64 `json:"timestamp_unix,omitempty"` |
| 34 | +} |
| 35 | + |
| 36 | +// CameraMediaStream wraps a host camera media stream handle. |
| 37 | +type CameraMediaStream struct { |
| 38 | + handle uint32 |
| 39 | +} |
| 40 | + |
| 41 | +// OpenCameraMediaStream opens a host camera media stream. |
| 42 | +func OpenCameraMediaStream(req CameraMediaOpenRequest) (*CameraMediaStream, error) { |
| 43 | + return OpenCameraMediaStreamContext(context.Background(), req) |
| 44 | +} |
| 45 | + |
| 46 | +// OpenCameraMediaStreamContext opens a host camera media stream with a context. |
| 47 | +func OpenCameraMediaStreamContext(ctx context.Context, req CameraMediaOpenRequest) (*CameraMediaStream, error) { |
| 48 | + if ctx != nil { |
| 49 | + if err := ctx.Err(); err != nil { |
| 50 | + return nil, err |
| 51 | + } |
| 52 | + } |
| 53 | + |
| 54 | + payload, err := json.Marshal(req) |
| 55 | + if err != nil { |
| 56 | + return nil, err |
| 57 | + } |
| 58 | + |
| 59 | + res := hostCameraMediaOpen(ptrFromBytes(payload), uint32(len(payload))) |
| 60 | + if res < 0 { |
| 61 | + return nil, hostErr(res, "camera_media_open") |
| 62 | + } |
| 63 | + |
| 64 | + return &CameraMediaStream{handle: uint32(res)}, nil |
| 65 | +} |
| 66 | + |
| 67 | +// Write uploads a camera media chunk to the host stream. |
| 68 | +func (s *CameraMediaStream) Write(meta CameraMediaChunkMetadata, payload []byte) error { |
| 69 | + return s.WriteContext(context.Background(), meta, payload) |
| 70 | +} |
| 71 | + |
| 72 | +// WriteContext uploads a camera media chunk to the host stream with a context. |
| 73 | +func (s *CameraMediaStream) WriteContext(ctx context.Context, meta CameraMediaChunkMetadata, payload []byte) error { |
| 74 | + if ctx != nil { |
| 75 | + if err := ctx.Err(); err != nil { |
| 76 | + return err |
| 77 | + } |
| 78 | + } |
| 79 | + |
| 80 | + if s == nil || s.handle == 0 { |
| 81 | + return errCameraMediaStreamNotInitialized |
| 82 | + } |
| 83 | + |
| 84 | + metaJSON, err := json.Marshal(meta) |
| 85 | + if err != nil { |
| 86 | + return err |
| 87 | + } |
| 88 | + |
| 89 | + res := hostCameraMediaWrite( |
| 90 | + s.handle, |
| 91 | + ptrFromBytes(metaJSON), |
| 92 | + uint32(len(metaJSON)), |
| 93 | + ptrFromBytes(payload), |
| 94 | + uint32(len(payload)), |
| 95 | + ) |
| 96 | + |
| 97 | + return hostErr(res, "camera_media_write") |
| 98 | +} |
| 99 | + |
| 100 | +// Heartbeat renews the host stream lease. |
| 101 | +func (s *CameraMediaStream) Heartbeat(meta CameraMediaHeartbeat) error { |
| 102 | + return s.HeartbeatContext(context.Background(), meta) |
| 103 | +} |
| 104 | + |
| 105 | +// HeartbeatContext renews the host stream lease with a context. |
| 106 | +func (s *CameraMediaStream) HeartbeatContext(ctx context.Context, meta CameraMediaHeartbeat) error { |
| 107 | + if ctx != nil { |
| 108 | + if err := ctx.Err(); err != nil { |
| 109 | + return err |
| 110 | + } |
| 111 | + } |
| 112 | + |
| 113 | + if s == nil || s.handle == 0 { |
| 114 | + return errCameraMediaStreamNotInitialized |
| 115 | + } |
| 116 | + |
| 117 | + metaJSON, err := json.Marshal(meta) |
| 118 | + if err != nil { |
| 119 | + return err |
| 120 | + } |
| 121 | + |
| 122 | + res := hostCameraMediaHeartbeat(s.handle, ptrFromBytes(metaJSON), uint32(len(metaJSON))) |
| 123 | + return hostErr(res, "camera_media_heartbeat") |
| 124 | +} |
| 125 | + |
| 126 | +// Close closes the host camera media stream. |
| 127 | +func (s *CameraMediaStream) Close(reason string) error { |
| 128 | + if s == nil || s.handle == 0 { |
| 129 | + return nil |
| 130 | + } |
| 131 | + |
| 132 | + reasonBytes := []byte(reason) |
| 133 | + res := hostCameraMediaClose(s.handle, ptrFromBytes(reasonBytes), uint32(len(reasonBytes))) |
| 134 | + s.handle = 0 |
| 135 | + |
| 136 | + return hostErr(res, "camera_media_close") |
| 137 | +} |
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