encoder.h

Motion JPEG编解码器源代码

/**********************************************************************
Copyright (c) 1991 MPEG/audio software simulation group, All Rights Reserved
encoder.h
**********************************************************************/
/**********************************************************************
 * MPEG/audio coding/decoding software, work in progress              *
 *   NOT for public distribution until verified and approved by the   *
 *   MPEG/audio committee.  For further information, please contact   *
 *   Davis Pan, 508-493-2241, e-mail: [e-mail]          *
 *                                                                    *
 * VERSION 3.5                                                       *
 *   changes made since last update:                                  *
 *   date   programmers         comment                               *
 * 2/25/91  Doulas Wong,        start of version 1.0 records          *
 *          Davis Pan                                                 *
 * 5/10/91  W. Joseph Carter    Reorganized & renamed all ".h" files  *
 *                              into "common.h" and "encoder.h".      *
 *                              Ported to Macintosh and Unix.         *
 *                              Added function prototypes for more    *
 *                              rigorous type checking.               *
 * 27jun91  dpwe (Aware)        moved "alloc_*" types, pros to common *
 *                              Use ifdef PROTO_ARGS for prototypes   *
 *                              prototypes reflect frame_params struct*
 * 7/10/91  Earle Jennings      Conversion of all floats to FLOAT     *
 * 10/3/91  Don H. Lee          implemented CRC-16 error protection   *
 *                              Additions and revisions are marked    *
 *                              with "dhl" for clarity                *
 * 2/11/92  W. Joseph Carter    Ported new code to Macintosh.  Most   *
 *                              important fixes involved changing     *
 *                              16-bit ints to long or unsigned in    *
 *                              bit alloc routines for quant of 65535 *
 *                              and passing proper function args.     *
 *                              Removed "Other Joint Stereo" option   *
 *                              and made bitrate be total channel     *
 *                              bitrate, irrespective of the mode.    *
 *                              Fixed many small bugs & reorganized.  *
 *                              Modified some function prototypes.    *
 * 7/27/92  Masahiro Iwadare    FFT modifications for Layer 3         *
 * 8/3/92   Mike Li             removed declaration _stklen for DOS.  *
 * 9/22/92  [e-mail]  Fix protos for _scale_factor_calc()   *
 * 2004/7/29 Steven Schultz     Cleanup and modernize                 *
 **********************************************************************/

/***********************************************************************
*
*  Encoder Definitions
*
***********************************************************************/

/* General Definitions */

/* Default Input Arguments (for command line control) */

#define DFLT_LAY        2      /* default encoding layer is II */
#define DFLT_MOD        's'    /* default mode is stereo */
#define DFLT_PSY        2      /* default psych model is 2 */
#define DFLT_SFQ        44.1   /* default input sampling rate is 44.1 kHz */
#define DFLT_BRT        128    /* default total output bitrate is 384 kbps */
#define DFLT_EMP        'n'    /* default de-emphasis is none */
#define DFLT_EXT        ".mpg" /* default output file extension */

#define FILETYPE_ENCODE 'TEXT'
#define CREATOR_ENCODE  'MpgD'

/* This is the smallest MNR a subband can have before it is counted
   as 'noisy' by the logic which chooses the number of JS subbands */

#define NOISY_MIN_MNR   0.0

/* Psychacoustic Model 1 Definitions */

#define CB_FRACTION     0.33
#define MAX_SNR         1000
#define NOISE           10
#define TONE            20
#define DBMIN           -200.0
#define LAST            -1
#define STOP            -100
#define POWERNORM       90.3090 /* = 20 * log10(32768) to normalize */
                                /* max output power to 96 dB per spec */

/* Psychoacoustic Model 2 Definitions */

#define LOGBLKSIZE      10
#define BLKSIZE         1024
#define HBLKSIZE        513
#define CBANDS          63
#define LXMIN           32.0

/***********************************************************************
*
*  Encoder Type Definitions
*
***********************************************************************/

/* Psychoacoustic Model 1 Type Definitions */

typedef int        IFFT2[FFT_SIZE/2];
typedef int        IFFT[FFT_SIZE];
typedef double     D9[9];
typedef double     D10[10];
typedef double     D640[640];
typedef double     D1408[1408];
typedef double     DFFT2[FFT_SIZE/2];
typedef double     DFFT[FFT_SIZE];
typedef double     DSBL[SBLIMIT];
typedef double     D2SBL[2][SBLIMIT];

typedef struct {
        int        line;
        double     bark, hear, x;
} g_thres, *g_ptr;

typedef struct {
        double     x;
        int        type, next, map;
} mask, *mask_ptr;

/* Psychoacoustic Model 2 Type Definitions */

typedef int        ICB[CBANDS];
typedef int        IHBLK[HBLKSIZE];
typedef FLOAT      F32[32];
typedef FLOAT      F2_32[2][32];
typedef FLOAT      FCB[CBANDS];
typedef FLOAT      FCBCB[CBANDS][CBANDS];
typedef FLOAT      FBLK[BLKSIZE];
typedef FLOAT      FHBLK[HBLKSIZE];
typedef FLOAT      F2HBLK[2][HBLKSIZE];
typedef FLOAT      F22HBLK[2][2][HBLKSIZE];
typedef double     DCB[CBANDS];

/***********************************************************************
*
*  Encoder Function Prototype Declarations
*
***********************************************************************/

/* The following functions are in the file "musicin.c" */

extern void   print_config(frame_params*, int*, unsigned long*, char *);

/* The following functions are in the file "encode.c" */

extern unsigned long    read_samples(FILE*, short[2304], unsigned long,
                           unsigned long);
extern unsigned long    get_audio(FILE*, short[2][1152], unsigned long,
                           int, int);
extern void   read_ana_window(double[HAN_SIZE]);
extern void   window_subband(short**, double[HAN_SIZE], int);
extern void   create_ana_filter(double[SBLIMIT][64]);
extern void   filter_subband(double[HAN_SIZE], double[SBLIMIT]);
extern void   encode_info(frame_params*, Bit_stream_struc*);
extern double mod(double);
extern void   I_combine_LR(double[2][3][SCALE_BLOCK][SBLIMIT],
                           double[3][SCALE_BLOCK][SBLIMIT]);
extern void   II_combine_LR(double[2][3][SCALE_BLOCK][SBLIMIT],
                           double[3][SCALE_BLOCK][SBLIMIT], int);
extern void   I_scale_factor_calc(double[][3][SCALE_BLOCK][SBLIMIT],
                           unsigned int[][3][SBLIMIT], int);
extern void   II_scale_factor_calc(double[][3][SCALE_BLOCK][SBLIMIT],
                           unsigned int[][3][SBLIMIT], int, int);
extern void   pick_scale(unsigned int[2][3][SBLIMIT], frame_params*,
                           double[2][SBLIMIT]);
extern void   put_scale(unsigned int[2][3][SBLIMIT], frame_params*,
                           double[2][SBLIMIT]);
extern void   II_transmission_pattern(unsigned int[2][3][SBLIMIT],
                           unsigned int[2][SBLIMIT], frame_params*);
extern void   II_encode_scale(unsigned int[2][SBLIMIT],
                           unsigned int[2][SBLIMIT],
                           unsigned int[2][3][SBLIMIT], frame_params*,
                           Bit_stream_struc*);
extern void   I_encode_scale(unsigned int[2][3][SBLIMIT],
                           unsigned int[2][SBLIMIT], frame_params*,
                           Bit_stream_struc*);
extern int    II_bits_for_nonoise(double[2][SBLIMIT], unsigned int[2][SBLIMIT],
                           frame_params*);
extern void   II_main_bit_allocation(double[2][SBLIMIT],
                           unsigned int[2][SBLIMIT], unsigned int[2][SBLIMIT],
                           int*, frame_params*);
extern int    II_a_bit_allocation(double[2][SBLIMIT], unsigned int[2][SBLIMIT],
                           unsigned int[2][SBLIMIT], int*, frame_params*);
extern int    I_bits_for_nonoise(double[2][SBLIMIT], frame_params*);
extern void   I_main_bit_allocation(double[2][SBLIMIT],
                           unsigned int[2][SBLIMIT], int*, frame_params*);
extern int    I_a_bit_allocation(double[2][SBLIMIT], unsigned int[2][SBLIMIT],
                           int*, frame_params*);
extern void   I_subband_quantization(unsigned int[2][3][SBLIMIT],
                           double[2][3][SCALE_BLOCK][SBLIMIT], unsigned int[3][SBLIMIT],
                           double[3][SCALE_BLOCK][SBLIMIT], unsigned int[2][SBLIMIT],
                           unsigned int[2][3][SCALE_BLOCK][SBLIMIT], frame_params*);
extern void   II_subband_quantization(unsigned int[2][3][SBLIMIT],
                           double[2][3][SCALE_BLOCK][SBLIMIT], unsigned int[3][SBLIMIT],
                           double[3][SCALE_BLOCK][SBLIMIT], unsigned int[2][SBLIMIT],
                           unsigned int[2][3][SCALE_BLOCK][SBLIMIT], frame_params*);
extern void   II_encode_bit_alloc(unsigned int[2][SBLIMIT], frame_params*,
                           Bit_stream_struc*);
extern void   I_encode_bit_alloc(unsigned int[2][SBLIMIT], frame_params*,
                           Bit_stream_struc*);
extern void   I_sample_encoding(unsigned int[2][3][SCALE_BLOCK][SBLIMIT],
                           unsigned int[2][SBLIMIT], frame_params*,
                           Bit_stream_struc*);
extern void   II_sample_encoding(unsigned int[2][3][SCALE_BLOCK][SBLIMIT],
                           unsigned int[2][SBLIMIT], frame_params*,
                           Bit_stream_struc*);
extern void   encode_CRC(unsigned int, Bit_stream_struc*);

/* The following functions are in the file "tonal.c" */

extern void        read_cbound(int, int);
extern void        read_freq_band(g_ptr*, int, int);
extern void        make_map(mask[HAN_SIZE], g_thres*);
extern double      add_db(double, double);
extern void        II_f_f_t(double[FFT_SIZE], mask[HAN_SIZE]);
extern void        II_hann_win(double[FFT_SIZE]);
extern void        II_pick_max(mask[HAN_SIZE], double[SBLIMIT]);
extern void        II_tonal_label(mask[HAN_SIZE], int*);
extern void        noise_label(mask*, int*, g_thres*);
extern void        subsampling(mask[HAN_SIZE], g_thres*, int*, int*);
extern void        threshold(mask[HAN_SIZE], g_thres*, int*, int*, int);
extern void        II_minimum_mask(g_thres*, double[SBLIMIT], int);
extern void        II_smr(double[SBLIMIT], double[SBLIMIT], double[SBLIMIT],
                           int);
extern void        II_Psycho_One(short[2][1152], double[2][SBLIMIT],
                           double[2][SBLIMIT], frame_params*);
extern void        I_f_f_t(double[FFT_SIZE/2], mask[HAN_SIZE/2]);
extern void        I_hann_win(double[FFT_SIZE/2]);
extern void        I_pick_max(mask[HAN_SIZE/2], double[SBLIMIT]);
extern void        I_tonal_label(mask[HAN_SIZE/2], int*);
extern void        I_minimum_mask(g_thres*, double[SBLIMIT]);
extern void        I_smr(double[SBLIMIT], double[SBLIMIT], double[SBLIMIT]);
extern void        I_Psycho_One(short[2][1152], double[2][SBLIMIT],
                           double[2][SBLIMIT], frame_params*);

/* The following functions are in the file "psy.c" */

extern void        psycho_anal(short int*, short int[1056], int, int,
                           FLOAT[32], double);

void fft(FLOAT *x_real, FLOAT *x_imag, FLOAT *energy, FLOAT *phi, int N);

/* The following functions are in the file "wav_io.c" */

extern int wav_read_header(FILE *fd, int *rate, int *chans, int *bits,
                    int *format, int32_t *bytes);