ADTS header structure (for VC++)

adts_header.cpp

enum aac_id: unsigned
{
	ai_mpeg4 = 0,
	ai_mpeg2 = 1,
};

enum aac_protection_absent: unsigned
{
	apa_protection = 0,
	apa_unprotection = 1,
};

enum aac_profile: unsigned
{
	ap_main = 0,
	ap_lc = 1,
	ap_sbr = 2,
};

enum aac_sampling_frequency: unsigned
{
	asf_96000 = 0,
	asf_88200 = 1,
	asf_64000 = 2,
	asf_48000 = 3,
	asf_44100 = 4,
	asf_32000 = 5,
	asf_24000 = 6,
	asf_22050 = 7,
	asf_16000 = 8,
	asf_12000 = 9,
	asf_11025 = 10,
	asf_8000 = 11,
};

_declspec( align( 1 ) )
class adts_header
{
public:
  adts_header( void ) :
		sync1( 0xff ),
		sync2( 0xf ),
		layer( 0 ),
		frame_length1( 0 ),
		frame_length2( 0 ),
		frame_length3( 0 ),
		adts_buffer_fullness1( 0x1f ),
		adts_buffer_fullness2( 0x3f ),
		no_raw_data_blocks_in_frame( 0 )
	{ }

	uint8 get_channel_configuration( void ) const { return channel_configuration1 << 2 | channel_configuration2; }
	void set_channel_configuration( const uint8 value )
	{
		channel_configuration1 = ( value >> 2 ) & 0x01;
		channel_configuration2 = value & 0x03;
	}

	uint16 get_frame_length( void ) const { return frame_length1 << 11 | frame_length2 << 3 | frame_length3; }
	void set_frame_length( const uint16 value )
	{
		frame_length1 = ( value >> 11 ) & 0x03;
		frame_length2 = ( value >> 3 ) & 0xff;
		frame_length3 = value & 0x07;
	}

private: unsigned sync1 : 8;

public:  aac_protection_absent protection_absent : 1;
private: unsigned layer : 2;
public:  aac_id id : 1;
private: unsigned sync2 : 4;

private: unsigned channel_configuration1 : 1;
public:  unsigned private_bit : 1;
public:  aac_sampling_frequency sampling_frequency_index : 4;
public:  aac_profile profile : 2;

private: unsigned frame_length1 : 2;
public:  unsigned copyright_identification_start : 1;
public:  unsigned copyright_identification_bit : 1;
public:  unsigned home : 1;
public:  unsigned copy : 1;
private: unsigned channel_configuration2 : 2;

private:
	unsigned frame_length2 : 8;

	unsigned adts_buffer_fullness1 : 5;
	unsigned frame_length3 : 3;

	unsigned no_raw_data_blocks_in_frame : 2;
	unsigned adts_buffer_fullness2 : 6;
};