mirror of
https://github.com/bluenviron/mediamtx
synced 2024-12-13 18:24:58 +00:00
71 lines
1.6 KiB
Go
71 lines
1.6 KiB
Go
package message
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import (
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"fmt"
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"time"
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"github.com/notedit/rtmp/format/flv/flvio"
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"github.com/aler9/rtsp-simple-server/internal/rtmp/chunk"
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"github.com/aler9/rtsp-simple-server/internal/rtmp/rawmessage"
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)
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const (
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// this is the chunk stream ID that is usually used to send MsgAudio{}
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MsgAudioChunkStreamID = 6
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)
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// MsgAudio is an audio message.
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type MsgAudio struct {
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ChunkStreamID byte
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DTS time.Duration
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MessageStreamID uint32
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Rate uint8
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Depth uint8
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Channels uint8
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AACType uint8
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Payload []byte
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}
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// Unmarshal implements Message.
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func (m *MsgAudio) Unmarshal(raw *rawmessage.Message) error {
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m.ChunkStreamID = raw.ChunkStreamID
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m.DTS = raw.Timestamp
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m.MessageStreamID = raw.MessageStreamID
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if len(raw.Body) < 2 {
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return fmt.Errorf("invalid body size")
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}
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codec := raw.Body[0] >> 4
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if codec != flvio.SOUND_AAC {
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return fmt.Errorf("unsupported audio codec: %d", codec)
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}
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m.Rate = (raw.Body[0] >> 2) & 0x03
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m.Depth = (raw.Body[0] >> 1) & 0x01
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m.Channels = raw.Body[0] & 0x01
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m.AACType = raw.Body[1]
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m.Payload = raw.Body[2:]
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return nil
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}
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// Marshal implements Message.
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func (m MsgAudio) Marshal() (*rawmessage.Message, error) {
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body := make([]byte, 2+len(m.Payload))
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body[0] = flvio.SOUND_AAC<<4 | m.Rate<<2 | m.Depth<<1 | m.Channels
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body[1] = m.AACType
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copy(body[2:], m.Payload)
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return &rawmessage.Message{
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ChunkStreamID: m.ChunkStreamID,
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Timestamp: m.DTS,
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Type: chunk.MessageTypeAudio,
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MessageStreamID: m.MessageStreamID,
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Body: body,
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}, nil
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}
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