rtpaac

type ADTSHeader struct {
	//fixed header
	// 12 bit syncword '1111 1111 1111', denoting stary of a frame
	Syncword uint
	// 1 bit of MPEG tag, 0 for MPEG-4, 1 for MPEG-2
	Id uint
	// 2 bits which is always '00'
	Layer uint
	// 1 bit, 1 without crc and 0 indicated that crc is used
	ProtectionAbsent uint
	// 1 bit indicated which level of aac to use
	Profile uint
	// 4 bits represents sample rate
	SamplingFreIndex uint
	// 1 bit
	PrivateBit uint
	// 3 bit represents channel count
	ChannelCfg uint
	// 1 bit
	OriginalCopy uint
	// 1 bit
	Home uint

	// variable header
	// 1 bit
	CopyrightIdentificationBit uint
	// 1 bit
	CopyrightIndentificationStart uint
	// 13 bit represents size of the adts frame which includes header and audio stream
	AacFrameLength uint
	// 11 bit 0x7FF indicates that is a variable bitrate stream
	AdtsBufferFullness uint

	/* number_of_raw_data_blocks_in_frame
	 * 表示ADTS帧中有number_of_raw_data_blocks_in_frame + 1个AAC原始帧
	 * 所以说number_of_raw_data_blocks_in_frame == 0
	 * 表示说ADTS帧中有一个AAC数据块并不是说没有。(一个AAC原始帧包含一段时间内1024个采样及相关数据)
	 */
	// 2 bits
	NumberOfRawDataBlockInFrame uint
}

type AudioConfig interface {
	Decode([]byte) error
}

type Decoder struct {
	// contains filtered or unexported fields
}

type Encoder struct {
	// contains filtered or unexported fields
}

type MPEG2AudioConfig struct {
	Header ADTSHeader
}

type MPEG4AudioConfig struct {
	Type         MPEG4AudioType
	SampleRate   int
	ChannelCount int
}

type MPEG4AudioType int

type RTPEncoder interface {
	Encode(aus [][]byte, firstPTS time.Duration) ([][]byte, error)
}