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1624 giacomo 1
/* global.h, global variables                                               */
2
 
3
/* Copyright (C) 1996, MPEG Software Simulation Group. All Rights Reserved. */
4
 
5
/*
6
 * Disclaimer of Warranty
7
 *
8
 * These software programs are available to the user without any license fee or
9
 * royalty on an "as is" basis.  The MPEG Software Simulation Group disclaims
10
 * any and all warranties, whether express, implied, or statuary, including any
11
 * implied warranties or merchantability or of fitness for a particular
12
 * purpose.  In no event shall the copyright-holder be liable for any
13
 * incidental, punitive, or consequential damages of any kind whatsoever
14
 * arising from the use of these programs.
15
 *
16
 * This disclaimer of warranty extends to the user of these programs and user's
17
 * customers, employees, agents, transferees, successors, and assigns.
18
 *
19
 * The MPEG Software Simulation Group does not represent or warrant that the
20
 * programs furnished hereunder are free of infringement of any third-party
21
 * patents.
22
 *
23
 * Commercial implementations of MPEG-1 and MPEG-2 video, including shareware,
24
 * are subject to royalty fees to patent holders.  Many of these patents are
25
 * general enough such that they are unavoidable regardless of implementation
26
 * design.
27
 *
28
 */
29
 
30
#include "ll/sys/types.h"
31
#include "kernel/kern.h"
32
#include "mpeg2dec.h"
33
 
34
/* choose between declaration (GLOBAL undefined)
35
 * and definition (GLOBAL defined)
36
 * GLOBAL is defined in exactly one file mpeg2dec.c)
37
 */
38
 
39
#ifndef GLOBAL
40
#define EXTERN extern
41
#else
42
#define EXTERN
43
#endif
44
 
45
/* prototypes of global functions */
46
/* readpic.c */
47
void Substitute_Frame_Buffer _ANSI_ARGS_ ((int bitstream_framenum,
48
  int sequence_framenum));
49
 
50
/* Get_Bits.c */
51
void Initialize_Buffer _ANSI_ARGS_((void));
52
void Fill_Buffer _ANSI_ARGS_((void));
53
unsigned int Show_Bits _ANSI_ARGS_((int n));
54
unsigned int Get_Bits1 _ANSI_ARGS_((void));
55
void Flush_Buffer _ANSI_ARGS_((int n));
56
unsigned int Get_Bits _ANSI_ARGS_((int n));
57
int Get_Byte _ANSI_ARGS_((void));
58
int Get_Word _ANSI_ARGS_((void));
59
 
60
/* systems.c */
61
void Next_Packet _ANSI_ARGS_((void));
62
int Get_Long _ANSI_ARGS_((void));
63
void Flush_Buffer32 _ANSI_ARGS_((void));
64
unsigned int Get_Bits32 _ANSI_ARGS_((void));
65
 
66
 
67
/* getblk.c */
68
void Decode_MPEG1_Intra_Block _ANSI_ARGS_((int comp, int dc_dct_pred[]));
69
void Decode_MPEG1_Non_Intra_Block _ANSI_ARGS_((int comp));
70
void Decode_MPEG2_Intra_Block _ANSI_ARGS_((int comp, int dc_dct_pred[]));
71
void Decode_MPEG2_Non_Intra_Block _ANSI_ARGS_((int comp));
72
 
73
/* gethdr.c */
74
int Get_Hdr _ANSI_ARGS_((void));
75
void next_start_code _ANSI_ARGS_((void));
76
int slice_header _ANSI_ARGS_((void));
77
void marker_bit _ANSI_ARGS_((char *text));
78
 
79
/* getpic.c */
80
void Decode_Picture _ANSI_ARGS_((int bitstream_framenum,
81
  int sequence_framenum));
82
void Output_Last_Frame_of_Sequence _ANSI_ARGS_((int framenum));
83
 
84
/* getvlc.c */
85
int Get_macroblock_type _ANSI_ARGS_((void));
86
int Get_motion_code _ANSI_ARGS_((void));
87
int Get_dmvector _ANSI_ARGS_((void));
88
int Get_coded_block_pattern _ANSI_ARGS_((void));
89
int Get_macroblock_address_increment _ANSI_ARGS_((void));
90
int Get_Luma_DC_dct_diff _ANSI_ARGS_((void));
91
int Get_Chroma_DC_dct_diff _ANSI_ARGS_((void));
92
 
93
/* idct.c */
94
void Fast_IDCT _ANSI_ARGS_((short *block));
95
void Initialize_Fast_IDCT _ANSI_ARGS_((void));
96
 
97
/* Reference_IDCT.c */
98
void Initialize_Reference_IDCT _ANSI_ARGS_((void));
99
void Reference_IDCT _ANSI_ARGS_((short *block));
100
 
101
/* motion.c */
102
void motion_vectors _ANSI_ARGS_((int PMV[2][2][2], int dmvector[2],
103
  int motion_vertical_field_select[2][2], int s, int motion_vector_count,
104
  int mv_format, int h_r_size, int v_r_size, int dmv, int mvscale));
105
void motion_vector _ANSI_ARGS_((int *PMV, int *dmvector,
106
  int h_r_size, int v_r_size, int dmv, int mvscale, int full_pel_vector));
107
void Dual_Prime_Arithmetic _ANSI_ARGS_((int DMV[][2], int *dmvector, int mvx, int mvy));
108
 
109
/* mpeg2dec.c */
110
void Error _ANSI_ARGS_((char *text));
111
void Warning _ANSI_ARGS_((char *text));
112
void Print_Bits _ANSI_ARGS_((int code, int bits, int len));
113
 
114
/* recon.c */
115
void form_predictions _ANSI_ARGS_((int bx, int by, int macroblock_type,
116
  int motion_type, int PMV[2][2][2], int motion_vertical_field_select[2][2],
117
  int dmvector[2], int stwtype));
118
 
119
/* spatscal.c */
120
void Spatial_Prediction _ANSI_ARGS_((void));
121
 
122
/* store.c */
123
void Write_Frame _ANSI_ARGS_((unsigned char *src[], int frame));
124
 
125
#ifdef DISPLAY
126
/* display.c */
127
void Initialize_Display_Process _ANSI_ARGS_((char *name));
128
void Terminate_Display_Process _ANSI_ARGS_((void));
129
void Display_Second_Field _ANSI_ARGS_((void));
130
void dither _ANSI_ARGS_((unsigned char *src[]));
131
void Initialize_Dither_Matrix _ANSI_ARGS_((void));
132
#endif
133
 
134
/* global variables */
135
 
136
EXTERN char Version[]
137
#ifdef GLOBAL
138
  ="mpeg2decode V1.2a, 96/07/19"
139
#endif
140
;
141
 
142
EXTERN char Author[]
143
#ifdef GLOBAL
144
  ="(C) 1996, MPEG Software Simulation Group"
145
#endif
146
;
147
 
148
 
149
/* zig-zag and alternate scan patterns */
150
EXTERN unsigned char scan[2][64]
151
#ifdef GLOBAL
152
=
153
{
154
  { /* Zig-Zag scan pattern  */
155
    0,1,8,16,9,2,3,10,17,24,32,25,18,11,4,5,
156
    12,19,26,33,40,48,41,34,27,20,13,6,7,14,21,28,
157
    35,42,49,56,57,50,43,36,29,22,15,23,30,37,44,51,
158
    58,59,52,45,38,31,39,46,53,60,61,54,47,55,62,63
159
  },
160
  { /* Alternate scan pattern */
161
    0,8,16,24,1,9,2,10,17,25,32,40,48,56,57,49,
162
    41,33,26,18,3,11,4,12,19,27,34,42,50,58,35,43,
163
    51,59,20,28,5,13,6,14,21,29,36,44,52,60,37,45,
164
    53,61,22,30,7,15,23,31,38,46,54,62,39,47,55,63
165
  }
166
}
167
#endif
168
;
169
 
170
/* default intra quantization matrix */
171
EXTERN unsigned char default_intra_quantizer_matrix[64]
172
#ifdef GLOBAL
173
=
174
{
175
  8, 16, 19, 22, 26, 27, 29, 34,
176
  16, 16, 22, 24, 27, 29, 34, 37,
177
  19, 22, 26, 27, 29, 34, 34, 38,
178
  22, 22, 26, 27, 29, 34, 37, 40,
179
  22, 26, 27, 29, 32, 35, 40, 48,
180
  26, 27, 29, 32, 35, 40, 48, 58,
181
  26, 27, 29, 34, 38, 46, 56, 69,
182
  27, 29, 35, 38, 46, 56, 69, 83
183
}
184
#endif
185
;
186
 
187
/* non-linear quantization coefficient table */
188
EXTERN unsigned char Non_Linear_quantizer_scale[32]
189
#ifdef GLOBAL
190
=
191
{
192
   0, 1, 2, 3, 4, 5, 6, 7,
193
   8,10,12,14,16,18,20,22,
194
  24,28,32,36,40,44,48,52,
195
  56,64,72,80,88,96,104,112
196
}
197
#endif
198
;
199
 
200
/* color space conversion coefficients
201
 * for YCbCr -> RGB mapping
202
 *
203
 * entries are {crv,cbu,cgu,cgv}
204
 *
205
 * crv=(255/224)*65536*(1-cr)/0.5
206
 * cbu=(255/224)*65536*(1-cb)/0.5
207
 * cgu=(255/224)*65536*(cb/cg)*(1-cb)/0.5
208
 * cgv=(255/224)*65536*(cr/cg)*(1-cr)/0.5
209
 *
210
 * where Y=cr*R+cg*G+cb*B (cr+cg+cb=1)
211
 */
212
 
213
/* ISO/IEC 13818-2 section 6.3.6 sequence_display_extension() */
214
 
215
EXTERN int Inverse_Table_6_9[8][4]
216
#ifdef GLOBAL
217
=
218
{
219
  {117504, 138453, 13954, 34903}, /* no sequence_display_extension */
220
  {117504, 138453, 13954, 34903}, /* ITU-R Rec. 709 (1990) */
221
  {104597, 132201, 25675, 53279}, /* unspecified */
222
  {104597, 132201, 25675, 53279}, /* reserved */
223
  {104448, 132798, 24759, 53109}, /* FCC */
224
  {104597, 132201, 25675, 53279}, /* ITU-R Rec. 624-4 System B, G */
225
  {104597, 132201, 25675, 53279}, /* SMPTE 170M */
226
  {117579, 136230, 16907, 35559}  /* SMPTE 240M (1987) */
227
}
228
#endif
229
;
230
 
231
 
232
 
233
 
234
 
235
/* output types (Output_Type) */
236
#define T_YUV   0
237
#define T_SIF   1
238
#define T_TGA   2
239
#define T_PPM   3
240
#define T_X11   4
241
#define T_X11HIQ 5
242
 
243
/* decoder operation control variables */
244
EXTERN int Output_Type;
245
EXTERN int hiQdither;
246
 
247
/* decoder operation control flags */
248
EXTERN int Quiet_Flag;
249
EXTERN int Trace_Flag;
250
EXTERN int Fault_Flag;
251
EXTERN int Verbose_Flag;
252
EXTERN int Two_Streams;
253
EXTERN int Spatial_Flag;
254
EXTERN int Reference_IDCT_Flag;
255
EXTERN int Frame_Store_Flag;
256
EXTERN int System_Stream_Flag;
257
EXTERN int Display_Progressive_Flag;
258
EXTERN int Ersatz_Flag;
259
EXTERN int Big_Picture_Flag;
260
EXTERN int Verify_Flag;
261
EXTERN int Stats_Flag;
262
EXTERN int User_Data_Flag;
263
EXTERN int Main_Bitstream_Flag;
264
 
265
 
266
/* filenames */
267
EXTERN char *Output_Picture_Filename;
268
EXTERN char *Substitute_Picture_Filename;
269
EXTERN char *Main_Bitstream_Filename;
270
EXTERN char *Enhancement_Layer_Bitstream_Filename;
271
 
272
 
273
/* buffers for multiuse purposes */
274
EXTERN char Error_Text[256];
275
EXTERN unsigned char *Clip;
276
 
277
/* pointers to generic picture buffers */
278
EXTERN unsigned char *backward_reference_frame[3];
279
EXTERN unsigned char *forward_reference_frame[3];
280
 
281
EXTERN unsigned char *auxframe[3];
282
EXTERN unsigned char *current_frame[3];
283
EXTERN unsigned char *substitute_frame[3];
284
 
285
 
286
/* pointers to scalability picture buffers */
287
EXTERN unsigned char *llframe0[3];
288
EXTERN unsigned char *llframe1[3];
289
 
290
EXTERN short *lltmp;
291
EXTERN char *Lower_Layer_Picture_Filename;
292
 
293
 
294
 
295
 
296
/* non-normative variables derived from normative elements */
297
EXTERN int Coded_Picture_Width;
298
EXTERN int Coded_Picture_Height;
299
EXTERN int Chroma_Width;
300
EXTERN int Chroma_Height;
301
EXTERN int block_count;
302
EXTERN int Second_Field;
303
EXTERN int profile, level;
304
 
305
/* normative derived variables (as per ISO/IEC 13818-2) */
306
EXTERN int horizontal_size;
307
EXTERN int vertical_size;
308
EXTERN int mb_width;
309
EXTERN int mb_height;
310
EXTERN double bit_rate;
311
EXTERN double frame_rate;
312
 
313
 
314
 
315
/* headers */
316
 
317
/* ISO/IEC 13818-2 section 6.2.2.1:  sequence_header() */
318
EXTERN int aspect_ratio_information;
319
EXTERN int frame_rate_code;
320
EXTERN int bit_rate_value;
321
EXTERN int vbv_buffer_size;
322
EXTERN int constrained_parameters_flag;
323
 
324
/* ISO/IEC 13818-2 section 6.2.2.3:  sequence_extension() */
325
EXTERN int profile_and_level_indication;
326
EXTERN int progressive_sequence;
327
EXTERN int chroma_format;
328
EXTERN int low_delay;
329
EXTERN int frame_rate_extension_n;
330
EXTERN int frame_rate_extension_d;
331
 
332
/* ISO/IEC 13818-2 section 6.2.2.4:  sequence_display_extension() */
333
EXTERN int video_format;  
334
EXTERN int color_description;
335
EXTERN int color_primaries;
336
EXTERN int transfer_characteristics;
337
EXTERN int matrix_coefficients;
338
EXTERN int display_horizontal_size;
339
EXTERN int display_vertical_size;
340
 
341
/* ISO/IEC 13818-2 section 6.2.3: picture_header() */
342
EXTERN int temporal_reference;
343
EXTERN int picture_coding_type;
344
EXTERN int vbv_delay;
345
EXTERN int full_pel_forward_vector;
346
EXTERN int forward_f_code;
347
EXTERN int full_pel_backward_vector;
348
EXTERN int backward_f_code;
349
 
350
 
351
/* ISO/IEC 13818-2 section 6.2.3.1: picture_coding_extension() header */
352
EXTERN int f_code[2][2];
353
EXTERN int intra_dc_precision;
354
EXTERN int picture_structure;
355
EXTERN int top_field_first;
356
EXTERN int frame_pred_frame_dct;
357
EXTERN int concealment_motion_vectors;
358
 
359
EXTERN int intra_vlc_format;
360
 
361
EXTERN int repeat_first_field;
362
 
363
EXTERN int chroma_420_type;
364
EXTERN int progressive_frame;
365
EXTERN int composite_display_flag;
366
EXTERN int v_axis;
367
EXTERN int field_sequence;
368
EXTERN int sub_carrier;
369
EXTERN int burst_amplitude;
370
EXTERN int sub_carrier_phase;
371
 
372
 
373
 
374
/* ISO/IEC 13818-2 section 6.2.3.3: picture_display_extension() header */
375
EXTERN int frame_center_horizontal_offset[3];
376
EXTERN int frame_center_vertical_offset[3];
377
 
378
 
379
 
380
/* ISO/IEC 13818-2 section 6.2.2.5: sequence_scalable_extension() header */
381
EXTERN int layer_id;
382
EXTERN int lower_layer_prediction_horizontal_size;
383
EXTERN int lower_layer_prediction_vertical_size;
384
EXTERN int horizontal_subsampling_factor_m;
385
EXTERN int horizontal_subsampling_factor_n;
386
EXTERN int vertical_subsampling_factor_m;
387
EXTERN int vertical_subsampling_factor_n;
388
 
389
 
390
/* ISO/IEC 13818-2 section 6.2.3.5: picture_spatial_scalable_extension() header */
391
EXTERN int lower_layer_temporal_reference;
392
EXTERN int lower_layer_horizontal_offset;
393
EXTERN int lower_layer_vertical_offset;
394
EXTERN int spatial_temporal_weight_code_table_index;
395
EXTERN int lower_layer_progressive_frame;
396
EXTERN int lower_layer_deinterlaced_field_select;
397
 
398
 
399
 
400
 
401
 
402
 
403
/* ISO/IEC 13818-2 section 6.2.3.6: copyright_extension() header */
404
EXTERN int copyright_flag;
405
EXTERN int copyright_identifier;
406
EXTERN int original_or_copy;
407
EXTERN int copyright_number_1;
408
EXTERN int copyright_number_2;
409
EXTERN int copyright_number_3;
410
 
411
/* ISO/IEC 13818-2 section 6.2.2.6: group_of_pictures_header()  */
412
EXTERN int drop_flag;
413
EXTERN int hour;
414
EXTERN int minute;
415
EXTERN int sec;
416
EXTERN int frame;
417
EXTERN int closed_gop;
418
EXTERN int broken_link;
419
 
420
 
421
 
422
/* layer specific variables (needed for SNR and DP scalability) */
423
EXTERN struct layer_data {
424
  /* bit input */
425
  int Infile;
426
 
427
  void *start_file_ptr;
428
  void *actual_file_ptr;
429
  void *end_file_ptr;
430
 
431
  int px;
432
  int py;
433
 
434
  unsigned char Rdbfr[2048];
435
  unsigned char *Rdptr;
436
  unsigned char Inbfr[16];
437
  /* from mpeg2play */
438
  unsigned int Bfr;
439
  unsigned char *Rdmax;
440
  int Incnt;
441
  int Bitcnt;
442
  /* sequence header and quant_matrix_extension() */
443
  int intra_quantizer_matrix[64];
444
  int non_intra_quantizer_matrix[64];
445
  int chroma_intra_quantizer_matrix[64];
446
  int chroma_non_intra_quantizer_matrix[64];
447
 
448
  int load_intra_quantizer_matrix;
449
  int load_non_intra_quantizer_matrix;
450
  int load_chroma_intra_quantizer_matrix;
451
  int load_chroma_non_intra_quantizer_matrix;
452
 
453
  int MPEG2_Flag;
454
  /* sequence scalable extension */
455
  int scalable_mode;
456
  /* picture coding extension */
457
  int q_scale_type;
458
  int alternate_scan;
459
  /* picture spatial scalable extension */
460
  int pict_scal;
461
  /* slice/macroblock */
462
  int priority_breakpoint;
463
  int quantizer_scale;
464
  int intra_slice;
465
  short block[12][64];
466
} base, enhan, *ld;
467
 
468
#ifdef VERIFY
469
EXTERN int verify_sequence_header;
470
EXTERN int verify_group_of_pictures_header;
471
EXTERN int verify_picture_header;
472
EXTERN int verify_slice_header;
473
EXTERN int verify_sequence_extension;
474
EXTERN int verify_sequence_display_extension;
475
EXTERN int verify_quant_matrix_extension;
476
EXTERN int verify_sequence_scalable_extension;
477
EXTERN int verify_picture_display_extension;
478
EXTERN int verify_picture_coding_extension;
479
EXTERN int verify_picture_spatial_scalable_extension;
480
EXTERN int verify_picture_temporal_scalable_extension;
481
EXTERN int verify_copyright_extension;
482
#endif /* VERIFY */
483
 
484
 
485
EXTERN int Decode_Layer;
486
 
487
/* verify.c */
488
#ifdef VERIFY
489
void Check_Headers _ANSI_ARGS_((int Bitstream_Framenum, int Sequence_Framenum));
490
void Clear_Verify_Headers _ANSI_ARGS_((void));
491
#endif /* VERIFY */
492
 
493
 
494
EXTERN int global_MBA;
495
EXTERN int global_pic;
496
EXTERN int True_Framenum;
497