1 /* global.h, global variables */
3 /* Copyright (C) 1996, MPEG Software Simulation Group. All Rights Reserved. */
6 * Disclaimer of Warranty
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.
16 * This disclaimer of warranty extends to the user of these programs and user's
17 * customers, employees, agents, transferees, successors, and assigns.
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
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
32 /* choose between declaration (GLOBAL undefined)
33 * and definition (GLOBAL defined)
34 * GLOBAL is defined in exactly one file mpeg2dec.c)
43 /* prototypes of global functions */
45 void Substitute_Frame_Buffer _ANSI_ARGS_ ((int bitstream_framenum,
46 int sequence_framenum));
49 void Initialize_Buffer _ANSI_ARGS_((void));
50 void Fill_Buffer _ANSI_ARGS_((void));
51 unsigned int Show_Bits _ANSI_ARGS_((int n));
52 unsigned int Get_Bits1 _ANSI_ARGS_((void));
53 void Flush_Buffer _ANSI_ARGS_((int n));
54 unsigned int Get_Bits _ANSI_ARGS_((int n));
55 int Get_Byte _ANSI_ARGS_((void));
56 int Get_Word _ANSI_ARGS_((void));
59 void Next_Packet _ANSI_ARGS_((void));
60 int Get_Long _ANSI_ARGS_((void));
61 void Flush_Buffer32 _ANSI_ARGS_((void));
62 unsigned int Get_Bits32 _ANSI_ARGS_((void));
66 void Decode_MPEG1_Intra_Block _ANSI_ARGS_((int comp, int dc_dct_pred[]));
67 void Decode_MPEG1_Non_Intra_Block _ANSI_ARGS_((int comp));
68 void Decode_MPEG2_Intra_Block _ANSI_ARGS_((int comp, int dc_dct_pred[]));
69 void Decode_MPEG2_Non_Intra_Block _ANSI_ARGS_((int comp));
72 int Get_Hdr _ANSI_ARGS_((void));
73 void next_start_code _ANSI_ARGS_((void));
74 int slice_header _ANSI_ARGS_((void));
75 void marker_bit _ANSI_ARGS_((const char *text));
78 void Decode_Picture _ANSI_ARGS_((int bitstream_framenum,
79 int sequence_framenum));
80 void Output_Last_Frame_of_Sequence _ANSI_ARGS_((int framenum));
83 int Get_macroblock_type _ANSI_ARGS_((void));
84 int Get_motion_code _ANSI_ARGS_((void));
85 int Get_dmvector _ANSI_ARGS_((void));
86 int Get_coded_block_pattern _ANSI_ARGS_((void));
87 int Get_macroblock_address_increment _ANSI_ARGS_((void));
88 int Get_Luma_DC_dct_diff _ANSI_ARGS_((void));
89 int Get_Chroma_DC_dct_diff _ANSI_ARGS_((void));
92 void Fast_IDCT _ANSI_ARGS_((short *block));
93 void Initialize_Fast_IDCT _ANSI_ARGS_((void));
95 /* Reference_IDCT.c */
96 void Initialize_Reference_IDCT _ANSI_ARGS_((void));
97 void Reference_IDCT _ANSI_ARGS_((short *block));
100 void motion_vectors _ANSI_ARGS_((int PMV[2][2][2], int dmvector[2],
101 int motion_vertical_field_select[2][2], int s, int motion_vector_count,
102 int mv_format, int h_r_size, int v_r_size, int dmv, int mvscale));
103 void motion_vector _ANSI_ARGS_((int *PMV, int *dmvector,
104 int h_r_size, int v_r_size, int dmv, int mvscale, int full_pel_vector));
105 void Dual_Prime_Arithmetic _ANSI_ARGS_((int DMV[][2], int *dmvector, int mvx, int mvy));
108 void Error _ANSI_ARGS_((const char *text));
109 void Warning _ANSI_ARGS_((char *text));
110 void Print_Bits _ANSI_ARGS_((int code, int bits, int len));
113 void form_predictions _ANSI_ARGS_((int bx, int by, int macroblock_type,
114 int motion_type, int PMV[2][2][2], int motion_vertical_field_select[2][2],
115 int dmvector[2], int stwtype));
118 void Spatial_Prediction _ANSI_ARGS_((void));
121 void FreeStaticBuffer _ANSI_ARGS_((void));
122 void Write_Frame _ANSI_ARGS_((unsigned char *src[], int frame));
126 void Initialize_Display_Process _ANSI_ARGS_((char *name));
127 void Terminate_Display_Process _ANSI_ARGS_((void));
128 void Display_Second_Field _ANSI_ARGS_((void));
129 void dither _ANSI_ARGS_((unsigned char *src[]));
130 void Initialize_Dither_Matrix _ANSI_ARGS_((void));
133 /* global variables */
135 EXTERN char Version[]
137 ="mpeg2decode V1.2a, 96/07/19"
143 ="(C) 1996, MPEG Software Simulation Group"
148 /* zig-zag and alternate scan patterns */
149 EXTERN unsigned char scan[2][64]
153 { /* Zig-Zag scan pattern */
154 0,1,8,16,9,2,3,10,17,24,32,25,18,11,4,5,
155 12,19,26,33,40,48,41,34,27,20,13,6,7,14,21,28,
156 35,42,49,56,57,50,43,36,29,22,15,23,30,37,44,51,
157 58,59,52,45,38,31,39,46,53,60,61,54,47,55,62,63
159 { /* Alternate scan pattern */
160 0,8,16,24,1,9,2,10,17,25,32,40,48,56,57,49,
161 41,33,26,18,3,11,4,12,19,27,34,42,50,58,35,43,
162 51,59,20,28,5,13,6,14,21,29,36,44,52,60,37,45,
163 53,61,22,30,7,15,23,31,38,46,54,62,39,47,55,63
169 /* default intra quantization matrix */
170 EXTERN unsigned char default_intra_quantizer_matrix[64]
174 8, 16, 19, 22, 26, 27, 29, 34,
175 16, 16, 22, 24, 27, 29, 34, 37,
176 19, 22, 26, 27, 29, 34, 34, 38,
177 22, 22, 26, 27, 29, 34, 37, 40,
178 22, 26, 27, 29, 32, 35, 40, 48,
179 26, 27, 29, 32, 35, 40, 48, 58,
180 26, 27, 29, 34, 38, 46, 56, 69,
181 27, 29, 35, 38, 46, 56, 69, 83
186 /* non-linear quantization coefficient table */
187 EXTERN unsigned char Non_Linear_quantizer_scale[32]
191 0, 1, 2, 3, 4, 5, 6, 7,
192 8,10,12,14,16,18,20,22,
193 24,28,32,36,40,44,48,52,
194 56,64,72,80,88,96,104,112
199 /* color space conversion coefficients
200 * for YCbCr -> RGB mapping
202 * entries are {crv,cbu,cgu,cgv}
204 * crv=(255/224)*65536*(1-cr)/0.5
205 * cbu=(255/224)*65536*(1-cb)/0.5
206 * cgu=(255/224)*65536*(cb/cg)*(1-cb)/0.5
207 * cgv=(255/224)*65536*(cr/cg)*(1-cr)/0.5
209 * where Y=cr*R+cg*G+cb*B (cr+cg+cb=1)
212 /* ISO/IEC 13818-2 section 6.3.6 sequence_display_extension() */
214 EXTERN int Inverse_Table_6_9[8][4]
218 {117504, 138453, 13954, 34903}, /* no sequence_display_extension */
219 {117504, 138453, 13954, 34903}, /* ITU-R Rec. 709 (1990) */
220 {104597, 132201, 25675, 53279}, /* unspecified */
221 {104597, 132201, 25675, 53279}, /* reserved */
222 {104448, 132798, 24759, 53109}, /* FCC */
223 {104597, 132201, 25675, 53279}, /* ITU-R Rec. 624-4 System B, G */
224 {104597, 132201, 25675, 53279}, /* SMPTE 170M */
225 {117579, 136230, 16907, 35559} /* SMPTE 240M (1987) */
234 /* output types (Output_Type) */
243 /* decoder operation control variables */
244 EXTERN int Output_Type;
245 EXTERN int hiQdither;
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;
267 EXTERN const char *Output_Picture_Filename;
268 EXTERN const char *Substitute_Picture_Filename;
269 EXTERN const char *Main_Bitstream_Filename;
270 EXTERN const char *Enhancement_Layer_Bitstream_Filename;
272 /* Pointer to allocated memory */
275 /* buffers for multiuse purposes */
276 EXTERN char Error_Text[256];
277 EXTERN unsigned char *Clip;
279 /* pointers to generic picture buffers */
280 EXTERN unsigned char *backward_reference_frame[3];
281 EXTERN unsigned char *forward_reference_frame[3];
283 EXTERN unsigned char *auxframe[3];
284 EXTERN unsigned char *current_frame[3];
285 EXTERN unsigned char *substitute_frame[3];
288 /* pointers to scalability picture buffers */
289 EXTERN unsigned char *llframe0[3];
290 EXTERN unsigned char *llframe1[3];
293 EXTERN const char *Lower_Layer_Picture_Filename;
298 /* non-normative variables derived from normative elements */
299 EXTERN int Coded_Picture_Width;
300 EXTERN int Coded_Picture_Height;
301 EXTERN int Chroma_Width;
302 EXTERN int Chroma_Height;
303 EXTERN int block_count;
304 EXTERN int Second_Field;
305 EXTERN int profile, level;
307 /* normative derived variables (as per ISO/IEC 13818-2) */
308 EXTERN int horizontal_size;
309 EXTERN int vertical_size;
311 EXTERN int mb_height;
312 EXTERN double bit_rate;
313 EXTERN double frame_rate;
319 /* ISO/IEC 13818-2 section 6.2.2.1: sequence_header() */
320 EXTERN int aspect_ratio_information;
321 EXTERN int frame_rate_code;
322 EXTERN int bit_rate_value;
323 EXTERN int vbv_buffer_size;
324 EXTERN int constrained_parameters_flag;
326 /* ISO/IEC 13818-2 section 6.2.2.3: sequence_extension() */
327 EXTERN int profile_and_level_indication;
328 EXTERN int progressive_sequence;
329 EXTERN int chroma_format;
330 EXTERN int low_delay;
331 EXTERN int frame_rate_extension_n;
332 EXTERN int frame_rate_extension_d;
334 /* ISO/IEC 13818-2 section 6.2.2.4: sequence_display_extension() */
335 EXTERN int video_format;
336 EXTERN int color_description;
337 EXTERN int color_primaries;
338 EXTERN int transfer_characteristics;
339 EXTERN int matrix_coefficients;
340 EXTERN int display_horizontal_size;
341 EXTERN int display_vertical_size;
343 /* ISO/IEC 13818-2 section 6.2.3: picture_header() */
344 EXTERN int temporal_reference;
345 EXTERN int picture_coding_type;
346 EXTERN int vbv_delay;
347 EXTERN int full_pel_forward_vector;
348 EXTERN int forward_f_code;
349 EXTERN int full_pel_backward_vector;
350 EXTERN int backward_f_code;
353 /* ISO/IEC 13818-2 section 6.2.3.1: picture_coding_extension() header */
354 EXTERN int f_code[2][2];
355 EXTERN int intra_dc_precision;
356 EXTERN int picture_structure;
357 EXTERN int top_field_first;
358 EXTERN int frame_pred_frame_dct;
359 EXTERN int concealment_motion_vectors;
361 EXTERN int intra_vlc_format;
363 EXTERN int repeat_first_field;
365 EXTERN int chroma_420_type;
366 EXTERN int progressive_frame;
367 EXTERN int composite_display_flag;
369 EXTERN int field_sequence;
370 EXTERN int sub_carrier;
371 EXTERN int burst_amplitude;
372 EXTERN int sub_carrier_phase;
376 /* ISO/IEC 13818-2 section 6.2.3.3: picture_display_extension() header */
377 EXTERN int frame_center_horizontal_offset[3];
378 EXTERN int frame_center_vertical_offset[3];
382 /* ISO/IEC 13818-2 section 6.2.2.5: sequence_scalable_extension() header */
384 EXTERN int lower_layer_prediction_horizontal_size;
385 EXTERN int lower_layer_prediction_vertical_size;
386 EXTERN int horizontal_subsampling_factor_m;
387 EXTERN int horizontal_subsampling_factor_n;
388 EXTERN int vertical_subsampling_factor_m;
389 EXTERN int vertical_subsampling_factor_n;
392 /* ISO/IEC 13818-2 section 6.2.3.5: picture_spatial_scalable_extension() header */
393 EXTERN int lower_layer_temporal_reference;
394 EXTERN int lower_layer_horizontal_offset;
395 EXTERN int lower_layer_vertical_offset;
396 EXTERN int spatial_temporal_weight_code_table_index;
397 EXTERN int lower_layer_progressive_frame;
398 EXTERN int lower_layer_deinterlaced_field_select;
405 /* ISO/IEC 13818-2 section 6.2.3.6: copyright_extension() header */
406 EXTERN int copyright_flag;
407 EXTERN int copyright_identifier;
408 EXTERN int original_or_copy;
409 EXTERN int copyright_number_1;
410 EXTERN int copyright_number_2;
411 EXTERN int copyright_number_3;
413 /* ISO/IEC 13818-2 section 6.2.2.6: group_of_pictures_header() */
414 EXTERN int drop_flag;
419 EXTERN int closed_gop;
420 EXTERN int broken_link;
424 /* layer specific variables (needed for SNR and DP scalability) */
425 EXTERN struct layer_data {
428 /* int (*open_stream) (char *filename);*/
429 off_t (*seek_stream) (istream *is, off_t offset,int whence);
430 ssize_t (*read_stream) (istream *is, void *buf, size_t count);
431 int (*close_stream) (istream *is);
432 unsigned char Rdbfr[2048];
433 unsigned char *Rdptr;
434 unsigned char Inbfr[16];
437 unsigned char *Rdmax;
440 /* sequence header and quant_matrix_extension() */
441 int intra_quantizer_matrix[64];
442 int non_intra_quantizer_matrix[64];
443 int chroma_intra_quantizer_matrix[64];
444 int chroma_non_intra_quantizer_matrix[64];
446 int load_intra_quantizer_matrix;
447 int load_non_intra_quantizer_matrix;
448 int load_chroma_intra_quantizer_matrix;
449 int load_chroma_non_intra_quantizer_matrix;
452 /* sequence scalable extension */
454 /* picture coding extension */
457 /* picture spatial scalable extension */
459 /* slice/macroblock */
460 int priority_breakpoint;
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;
485 EXTERN int Decode_Layer;
489 void Check_Headers _ANSI_ARGS_((int Bitstream_Framenum, int Sequence_Framenum));
490 void Clear_Verify_Headers _ANSI_ARGS_((void));
494 EXTERN int global_MBA;
495 EXTERN int global_pic;
496 EXTERN int True_Framenum;