#ifndef HEADER_H#define HEADER_H#ifdef __GNUG__#pragma interface#endifenum e_mode { stereo, joint_stereo, dual_channel, single_channel  };enum e_sample_frequency { fourtyfour_point_one, fourtyeight, thirtytwo };// Class for extraction information from a frame header:class Header {  static const uint32	frequencies[3];  uint32		h_layer, h_protection_bit, h_bitrate_index,			 h_padding_bit, h_mode_extension;  e_mode		h_mode;  e_sample_frequency	h_sample_frequency;  uint32		h_number_of_subbands, h_intensity_stereo_bound;  bool			h_copyright, h_original;  Crc16			*crc;  uint16		checksum;  uint32		calculate_framesize (); public:			Header (void) { crc = (Crc16 *)0; }		       ~Header (void) { if (crc) delete crc; }  int			read_header (AudioStream *, Crc16 **);			// read a 32-bit header from the bitstream  // functions to query header contents:  uint32		layer (void) { return h_layer; };  uint32		bitrate_index (void) { return h_bitrate_index; };  e_sample_frequency	sample_frequency (void) { return h_sample_frequency; };  uint32		frequency (void) { return frequencies[h_sample_frequency]; }  static uint32	frequency (e_sample_frequency rate) { return frequencies[rate]; }  e_mode		mode (void) { return h_mode; };  bool			checksums(void){ return (!h_protection_bit) ? True : False; }  bool			copyright(void){ return h_copyright; }  bool			original(void){ return h_original; }  bool			checksum_ok(void){ return (checksum==crc->checksum()) ? True : False; }			// compares computed checksum with stream checksum  // functions which return header informations as strings:  const char *		layer_string (void);  const char *		bitrate_string (void);  const char *		sample_frequency_string (void);  const char *		mode_string (void);  uint32		number_of_subbands (void) { return h_number_of_subbands; };			// returns the number of subbands in the current frame  uint32		intensity_stereo_bound (void) {return h_intensity_stereo_bound; };			// (Layer II joint stereo only)			// returns the number of subbands which are in stereo mode,			// subbands above that limit are in intensity stereo mode};#endif