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/* global.h, global variables                                               */

/* Copyright (C) 1996, MPEG Software Simulation Group. All Rights Reserved. */

/*
 * Disclaimer of Warranty
 *
 * These software programs are available to the user without any license fee or
 * royalty on an "as is" basis.  The MPEG Software Simulation Group disclaims
 * any and all warranties, whether express, implied, or statuary, including any
 * implied warranties or merchantability or of fitness for a particular
 * purpose.  In no event shall the copyright-holder be liable for any
 * incidental, punitive, or consequential damages of any kind whatsoever
 * arising from the use of these programs.
 *
 * This disclaimer of warranty extends to the user of these programs and user's
 * customers, employees, agents, transferees, successors, and assigns.
 *
 * The MPEG Software Simulation Group does not represent or warrant that the
 * programs furnished hereunder are free of infringement of any third-party
 * patents.
 *
 * Commercial implementations of MPEG-1 and MPEG-2 video, including shareware,
 * are subject to royalty fees to patent holders.  Many of these patents are
 * general enough such that they are unavoidable regardless of implementation
 * design.
 *
 */


#include "ll/sys/types.h"
#include "kernel/kern.h"
#include "mpeg2dec.h"

#include <hartport/hartport/hartport.h>
#include "ll/i386/x-dos.h"
/* choose between declaration (GLOBAL undefined)
 * and definition (GLOBAL defined)
 * GLOBAL is defined in exactly one file mpeg2dec.c)
 */


#ifndef GLOBAL
#define EXTERN extern
#else
#define EXTERN
#endif

/* prototypes of global functions */
/* readpic.c */
void Substitute_Frame_Buffer(int bitstream_framenum,
  int sequence_framenum);

/* Get_Bits.c */
void Initialize_Buffer(void);
void Fill_Buffer(void);
unsigned int Show_Bits(int n);
unsigned int Get_Bits1(void);
void Flush_Buffer(int n);
unsigned int Get_Bits(int n);
int Get_Byte(void);
int Get_Word(void);

/* systems.c */
void Next_Packet(void);
int Get_Long(void);
void Flush_Buffer32(void);
unsigned int Get_Bits32(void);


/* getblk.c */
void Decode_MPEG1_Intra_Block(int comp, int dc_dct_pred[]);
void Decode_MPEG1_Non_Intra_Block(int comp);
void Decode_MPEG2_Intra_Block(int comp, int dc_dct_pred[]);
void Decode_MPEG2_Non_Intra_Block(int comp);

/* gethdr.c */
int Get_Hdr(void);
void next_start_code(void);
int slice_header(void);
void marker_bit(char *text);

/* getpic.c */
void Decode_Picture(int bitstream_framenum, int sequence_framenum);
void Output_Last_Frame_of_Sequence(int framenum);

/* getvlc.c */
int Get_macroblock_type(void);
int Get_motion_code(void);
int Get_dmvector(void);
int Get_coded_block_pattern(void);
int Get_macroblock_address_increment(void);
int Get_Luma_DC_dct_diff(void);
int Get_Chroma_DC_dct_diff(void);

/* idct.c */
void Fast_IDCT(short *block);
void Initialize_Fast_IDCT(void);

/* Reference_IDCT.c */
void Initialize_Reference_IDCT(void);
void Reference_IDCT(short *block);

/* motion.c */
void motion_vectors(int PMV[2][2][2], int dmvector[2],
  int motion_vertical_field_select[2][2], int s, int motion_vector_count,
  int mv_format, int h_r_size, int v_r_size, int dmv, int mvscale);
void motion_vector(int *PMV, int *dmvector,
  int h_r_size, int v_r_size, int dmv, int mvscale, int full_pel_vector);
void Dual_Prime_Arithmetic(int DMV[][2], int *dmvector, int mvx, int mvy);

/* mpeg2dec.c */
void Error(char *text);
void Warning(char *text);
void Print_Bits(int code, int bits, int len);

/* recon.c */
void form_predictions(int bx, int by, int macroblock_type,
  int motion_type, int PMV[2][2][2], int motion_vertical_field_select[2][2],
  int dmvector[2], int stwtype);

/* spatscal.c */
void Spatial_Prediction(void);

/* store.c */
void Write_Frame(unsigned char *src[], int frame);

#ifdef DISPLAY
/* display.c */
void Initialize_Display_Process(char *name);
void Terminate_Display_Process (void);
void Display_Second_Field(void);
void dither(unsigned char *src[]);
void Initialize_Dither_Matrix(void);
#endif

/* global variables */

EXTERN char Version[]
#ifdef GLOBAL
  ="mpeg2decode V1.2a, 96/07/19"
#endif
;

EXTERN char Author[]
#ifdef GLOBAL
  ="(C) 1996, MPEG Software Simulation Group"
#endif
;


/* zig-zag and alternate scan patterns */
EXTERN unsigned char scan[2][64]
#ifdef GLOBAL
=
{
  { /* Zig-Zag scan pattern  */
    0,1,8,16,9,2,3,10,17,24,32,25,18,11,4,5,
    12,19,26,33,40,48,41,34,27,20,13,6,7,14,21,28,
    35,42,49,56,57,50,43,36,29,22,15,23,30,37,44,51,
    58,59,52,45,38,31,39,46,53,60,61,54,47,55,62,63
  },
  { /* Alternate scan pattern */
    0,8,16,24,1,9,2,10,17,25,32,40,48,56,57,49,
    41,33,26,18,3,11,4,12,19,27,34,42,50,58,35,43,
    51,59,20,28,5,13,6,14,21,29,36,44,52,60,37,45,
    53,61,22,30,7,15,23,31,38,46,54,62,39,47,55,63
  }
}
#endif
;

/* default intra quantization matrix */
EXTERN unsigned char default_intra_quantizer_matrix[64]
#ifdef GLOBAL
=
{
  8, 16, 19, 22, 26, 27, 29, 34,
  16, 16, 22, 24, 27, 29, 34, 37,
  19, 22, 26, 27, 29, 34, 34, 38,
  22, 22, 26, 27, 29, 34, 37, 40,
  22, 26, 27, 29, 32, 35, 40, 48,
  26, 27, 29, 32, 35, 40, 48, 58,
  26, 27, 29, 34, 38, 46, 56, 69,
  27, 29, 35, 38, 46, 56, 69, 83
}
#endif
;

/* non-linear quantization coefficient table */
EXTERN unsigned char Non_Linear_quantizer_scale[32]
#ifdef GLOBAL
=
{
   0, 1, 2, 3, 4, 5, 6, 7,
   8,10,12,14,16,18,20,22,
  24,28,32,36,40,44,48,52,
  56,64,72,80,88,96,104,112
}
#endif
;

/* color space conversion coefficients
 * for YCbCr -> RGB mapping
 *
 * entries are {crv,cbu,cgu,cgv}
 *
 * crv=(255/224)*65536*(1-cr)/0.5
 * cbu=(255/224)*65536*(1-cb)/0.5
 * cgu=(255/224)*65536*(cb/cg)*(1-cb)/0.5
 * cgv=(255/224)*65536*(cr/cg)*(1-cr)/0.5
 *
 * where Y=cr*R+cg*G+cb*B (cr+cg+cb=1)
 */


/* ISO/IEC 13818-2 section 6.3.6 sequence_display_extension() */

EXTERN int Inverse_Table_6_9[8][4]
#ifdef GLOBAL
=
{
  {117504, 138453, 13954, 34903}, /* no sequence_display_extension */
  {117504, 138453, 13954, 34903}, /* ITU-R Rec. 709 (1990) */
  {104597, 132201, 25675, 53279}, /* unspecified */
  {104597, 132201, 25675, 53279}, /* reserved */
  {104448, 132798, 24759, 53109}, /* FCC */
  {104597, 132201, 25675, 53279}, /* ITU-R Rec. 624-4 System B, G */
  {104597, 132201, 25675, 53279}, /* SMPTE 170M */
  {117579, 136230, 16907, 35559}  /* SMPTE 240M (1987) */
}
#endif
;





/* output types (Output_Type) */
#define T_YUV   0
#define T_SIF   1
#define T_TGA   2
#define T_PPM   3
#define T_X11   4
#define T_X11HIQ 5

/* decoder operation control variables */
EXTERN int Output_Type;
EXTERN int hiQdither;

/* decoder operation control flags */
EXTERN int Quiet_Flag;
EXTERN int Trace_Flag;
EXTERN int Fault_Flag;
EXTERN int Verbose_Flag;
EXTERN int Two_Streams;
EXTERN int Spatial_Flag;
EXTERN int Reference_IDCT_Flag;
EXTERN int Frame_Store_Flag;
EXTERN int System_Stream_Flag;
EXTERN int Display_Progressive_Flag;
EXTERN int Ersatz_Flag;
EXTERN int Big_Picture_Flag;
EXTERN int Verify_Flag;
EXTERN int Stats_Flag;
EXTERN int User_Data_Flag;
EXTERN int Main_Bitstream_Flag;


/* filenames */
EXTERN char *Output_Picture_Filename;
EXTERN char *Substitute_Picture_Filename;
EXTERN char *Main_Bitstream_Filename;
EXTERN char *Enhancement_Layer_Bitstream_Filename;


/* buffers for multiuse purposes */
EXTERN char Error_Text[256];
EXTERN unsigned char *Clip;

/* pointers to generic picture buffers */
EXTERN unsigned char *backward_reference_frame[3];
EXTERN unsigned char *forward_reference_frame[3];

EXTERN unsigned char *auxframe[3];
EXTERN unsigned char *current_frame[3];
EXTERN unsigned char *substitute_frame[3];


/* pointers to scalability picture buffers */
EXTERN unsigned char *llframe0[3];
EXTERN unsigned char *llframe1[3];

EXTERN short *lltmp;
EXTERN char *Lower_Layer_Picture_Filename;




/* non-normative variables derived from normative elements */
EXTERN int Coded_Picture_Width;
EXTERN int Coded_Picture_Height;
EXTERN int Chroma_Width;
EXTERN int Chroma_Height;
EXTERN int block_count;
EXTERN int Second_Field;
EXTERN int profile, level;

/* normative derived variables (as per ISO/IEC 13818-2) */
EXTERN int horizontal_size;
EXTERN int vertical_size;
EXTERN int mb_width;
EXTERN int mb_height;
EXTERN double bit_rate;
EXTERN double frame_rate;



/* headers */

/* ISO/IEC 13818-2 section 6.2.2.1:  sequence_header() */
EXTERN int aspect_ratio_information;
EXTERN int frame_rate_code;
EXTERN int bit_rate_value;
EXTERN int vbv_buffer_size;
EXTERN int constrained_parameters_flag;

/* ISO/IEC 13818-2 section 6.2.2.3:  sequence_extension() */
EXTERN int profile_and_level_indication;
EXTERN int progressive_sequence;
EXTERN int chroma_format;
EXTERN int low_delay;
EXTERN int frame_rate_extension_n;
EXTERN int frame_rate_extension_d;

/* ISO/IEC 13818-2 section 6.2.2.4:  sequence_display_extension() */
EXTERN int video_format;  
EXTERN int color_description;
EXTERN int color_primaries;
EXTERN int transfer_characteristics;
EXTERN int matrix_coefficients;
EXTERN int display_horizontal_size;
EXTERN int display_vertical_size;

/* ISO/IEC 13818-2 section 6.2.3: picture_header() */
EXTERN int temporal_reference;
EXTERN int picture_coding_type;
EXTERN int vbv_delay;
EXTERN int full_pel_forward_vector;
EXTERN int forward_f_code;
EXTERN int full_pel_backward_vector;
EXTERN int backward_f_code;


/* ISO/IEC 13818-2 section 6.2.3.1: picture_coding_extension() header */
EXTERN int f_code[2][2];
EXTERN int intra_dc_precision;
EXTERN int picture_structure;
EXTERN int top_field_first;
EXTERN int frame_pred_frame_dct;
EXTERN int concealment_motion_vectors;

EXTERN int intra_vlc_format;

EXTERN int repeat_first_field;

EXTERN int chroma_420_type;
EXTERN int progressive_frame;
EXTERN int composite_display_flag;
EXTERN int v_axis;
EXTERN int field_sequence;
EXTERN int sub_carrier;
EXTERN int burst_amplitude;
EXTERN int sub_carrier_phase;



/* ISO/IEC 13818-2 section 6.2.3.3: picture_display_extension() header */
EXTERN int frame_center_horizontal_offset[3];
EXTERN int frame_center_vertical_offset[3];



/* ISO/IEC 13818-2 section 6.2.2.5: sequence_scalable_extension() header */
EXTERN int layer_id;
EXTERN int lower_layer_prediction_horizontal_size;
EXTERN int lower_layer_prediction_vertical_size;
EXTERN int horizontal_subsampling_factor_m;
EXTERN int horizontal_subsampling_factor_n;
EXTERN int vertical_subsampling_factor_m;
EXTERN int vertical_subsampling_factor_n;


/* ISO/IEC 13818-2 section 6.2.3.5: picture_spatial_scalable_extension() header */
EXTERN int lower_layer_temporal_reference;
EXTERN int lower_layer_horizontal_offset;
EXTERN int lower_layer_vertical_offset;
EXTERN int spatial_temporal_weight_code_table_index;
EXTERN int lower_layer_progressive_frame;
EXTERN int lower_layer_deinterlaced_field_select;






/* ISO/IEC 13818-2 section 6.2.3.6: copyright_extension() header */
EXTERN int copyright_flag;
EXTERN int copyright_identifier;
EXTERN int original_or_copy;
EXTERN int copyright_number_1;
EXTERN int copyright_number_2;
EXTERN int copyright_number_3;

/* ISO/IEC 13818-2 section 6.2.2.6: group_of_pictures_header()  */
EXTERN int drop_flag;
EXTERN int hour;
EXTERN int minute;
EXTERN int sec;
EXTERN int frame;
EXTERN int closed_gop;
EXTERN int broken_link;



/* layer specific variables (needed for SNR and DP scalability) */
EXTERN struct layer_data {
  /* bit input */
  int Infile;

  void *start_file_ptr;
  void *actual_file_ptr;
  void *end_file_ptr;
 
  int px;
  int py;
 
  unsigned char Rdbfr[2048];
  unsigned char *Rdptr;
  unsigned char Inbfr[16];
  /* from mpeg2play */
  unsigned int Bfr;
  unsigned char *Rdmax;
  int Incnt;
  int Bitcnt;
  /* sequence header and quant_matrix_extension() */
  int intra_quantizer_matrix[64];
  int non_intra_quantizer_matrix[64];
  int chroma_intra_quantizer_matrix[64];
  int chroma_non_intra_quantizer_matrix[64];
 
  int load_intra_quantizer_matrix;
  int load_non_intra_quantizer_matrix;
  int load_chroma_intra_quantizer_matrix;
  int load_chroma_non_intra_quantizer_matrix;

  int MPEG2_Flag;
  /* sequence scalable extension */
  int scalable_mode;
  /* picture coding extension */
  int q_scale_type;
  int alternate_scan;
  /* picture spatial scalable extension */
  int pict_scal;
  /* slice/macroblock */
  int priority_breakpoint;
  int quantizer_scale;
  int intra_slice;
  short block[12][64];
} base, enhan, *ld;

#ifdef VERIFY
EXTERN int verify_sequence_header;
EXTERN int verify_group_of_pictures_header;
EXTERN int verify_picture_header;
EXTERN int verify_slice_header;
EXTERN int verify_sequence_extension;
EXTERN int verify_sequence_display_extension;
EXTERN int verify_quant_matrix_extension;
EXTERN int verify_sequence_scalable_extension;
EXTERN int verify_picture_display_extension;
EXTERN int verify_picture_coding_extension;
EXTERN int verify_picture_spatial_scalable_extension;
EXTERN int verify_picture_temporal_scalable_extension;
EXTERN int verify_copyright_extension;
#endif /* VERIFY */


EXTERN int Decode_Layer;

/* verify.c */
#ifdef VERIFY
void Check_Headers(int Bitstream_Framenum, int Sequence_Framenum);
void Clear_Verify_Headers(void);
#endif /* VERIFY */


EXTERN int global_MBA;
EXTERN int global_pic;
EXTERN int True_Framenum;


/***************************************************************************'
 *
 * Global things (structs, varable)
 *
 * Author: Robert B√§ckgren
 ****************************************************************************/


#define NUMBER_OF_MESSAGE 3
#define BUFFERSIZE 2048

// The message that goes between the read task and decoder task
struct readDecodeMessage
{
  int size;
  unsigned char buffer[BUFFERSIZE];
};

// The message that goes between the decoder and display
struct decodeDisplayMessage
{
  int frame;
  unsigned char *src[3];
};

// The struct tha contain the different ports that the decoder is using.
struct DecoderPorts
{
  PORT readTaskPort;
  PORT displayTaskPort;
};

// The different ports
struct DecoderPorts *decoderTaskPort;
PORT readTaskPort;
PORT displayTaskPort;

// This flag is used in the decoder init fase (must use or else we will read in the buffer wrong) Use it in function read in file getbits.c and in function Initialize_Decoder in file mpeg2dec.c.
int initfaseFlag;

void displayTaskFunction(unsigned char *src[], int frame);