1 /*****************************************************************************
2 * vpar_headers.c : headers parsing
4 *****************************************************************************/
6 /*****************************************************************************
8 *****************************************************************************/
16 #include <X11/extensions/XShm.h>
21 #include "vlc_thread.h"
24 #include "debug.h" /* ?? temporaire, requis par netlist.h */
27 #include "input_netlist.h"
28 #include "decoder_fifo.h"
30 #include "video_output.h"
32 #include "vdec_idct.h"
33 #include "video_decoder.h"
34 #include "vdec_motion.h"
36 #include "vpar_blocks.h"
37 #include "vpar_headers.h"
38 #include "video_fifo.h"
39 #include "vpar_synchro.h"
40 #include "video_parser.h"
41 #include "vpar_motion.h"
46 static __inline__ void NextStartCode( vpar_thread_t * p_vpar );
47 static void SequenceHeader( vpar_thread_t * p_vpar );
48 static void GroupHeader( vpar_thread_t * p_vpar );
49 static void PictureHeader( vpar_thread_t * p_vpar );
50 static void SliceHeader00( vpar_thread_t * p_vpar,
51 int * pi_mb_address, int i_mb_base,
53 static void SliceHeader01( vpar_thread_t * p_vpar,
54 int * pi_mb_address, int i_mb_base,
56 static void SliceHeader10( vpar_thread_t * p_vpar,
57 int * pi_mb_address, int i_mb_base,
59 static void SliceHeader11( vpar_thread_t * p_vpar,
60 int * pi_mb_address, int i_mb_base,
62 static __inline__ void SliceHeader( vpar_thread_t * p_vpar,
63 int * pi_mb_address, int i_mb_base,
65 static void ExtensionAndUserData( vpar_thread_t * p_vpar );
66 static void QuantMatrixExtension( vpar_thread_t * p_vpar );
67 static void SequenceScalableExtension( vpar_thread_t * p_vpar );
68 static void SequenceDisplayExtension( vpar_thread_t * p_vpar );
69 static void PictureDisplayExtension( vpar_thread_t * p_vpar );
70 static void PictureSpatialScalableExtension( vpar_thread_t * p_vpar );
71 static void PictureTemporalScalableExtension( vpar_thread_t * p_vpar );
72 static void CopyrightExtension( vpar_thread_t * p_vpar );
78 /*****************************************************************************
79 * pi_default_intra_quant : default quantization matrix
80 *****************************************************************************/
82 int pi_default_intra_quant[] =
84 8, 16, 19, 22, 26, 27, 29, 34,
85 16, 16, 22, 24, 27, 29, 34, 37,
86 19, 22, 26, 27, 29, 34, 34, 38,
87 22, 22, 26, 27, 29, 34, 37, 40,
88 22, 26, 27, 29, 32, 35, 40, 48,
89 26, 27, 29, 32, 35, 40, 48, 58,
90 26, 27, 29, 34, 38, 46, 56, 69,
91 27, 29, 35, 38, 46, 56, 69, 83
94 int pi_default_intra_quant[] =
96 2048, 5681, 6355, 6623, 6656, 5431, 4018, 2401,
97 5681, 7880, 10207, 10021, 9587, 8091, 6534, 3625,
98 6355, 10207, 11363, 10619, 9700, 8935, 6155, 3507,
99 6623, 9186, 10226, 9557, 8730, 8041, 6028, 3322,
100 5632, 9232, 9031, 8730, 8192, 7040, 5542, 3390,
101 5230, 7533, 7621, 7568, 7040, 6321, 5225, 3219,
102 3602, 5189, 5250, 5539, 5265, 5007, 4199, 2638,
103 1907, 2841, 3230, 3156, 3249, 3108, 2638, 1617
107 /*****************************************************************************
108 * pi_default_nonintra_quant : default quantization matrix
109 *****************************************************************************/
111 int pi_default_nonintra_quant[] =
113 16, 16, 16, 16, 16, 16, 16, 16,
114 16, 16, 16, 16, 16, 16, 16, 16,
115 16, 16, 16, 16, 16, 16, 16, 16,
116 16, 16, 16, 16, 16, 16, 16, 16,
117 16, 16, 16, 16, 16, 16, 16, 16,
118 16, 16, 16, 16, 16, 16, 16, 16,
119 16, 16, 16, 16, 16, 16, 16, 16,
120 16, 16, 16, 16, 16, 16, 16, 16
123 int pi_default_nonintra_quanit[] =
125 4096, 5680, 5344, 4816, 4096, 3216, 2224, 1136,
126 5680, 7888, 7424, 6688, 5680, 4464, 3072, 1568,
127 5344, 7424, 6992, 6288, 5344, 4208, 2896, 1472,
128 4816, 6688, 6288, 5664, 4816, 3792, 2608, 1328,
129 4096, 5680, 5344, 4816, 4096, 3216, 2224, 1136,
130 3216, 4464, 4208, 3792, 3216, 2528, 1744, 880,
131 2224, 3072, 2896, 2608, 2224, 1744, 1200, 608,
132 1136, 1568, 1472, 1328, 1136, 880, 608, 304
136 /*****************************************************************************
137 * pi_scan : zig-zag and alternate scan patterns
138 *****************************************************************************/
141 { /* Zig-Zag pattern */
142 0,1,8,16,9,2,3,10,17,24,32,25,18,11,4,5,
143 12,19,26,33,40,48,41,34,27,20,13,6,7,14,21,28,
144 35,42,49,56,57,50,43,36,29,22,15,23,30,37,44,51,
145 58,59,52,45,38,31,39,46,53,60,61,54,47,55,62,63
147 { /* Alternate scan pattern */
148 0,8,16,24,1,9,2,10,17,25,32,40,48,56,57,49,
149 41,33,26,18,3,11,4,12,19,27,34,42,50,58,35,43,
150 51,59,20,28,5,13,6,14,21,29,36,44,52,60,37,45,
151 53,61,22,30,7,15,23,31,38,46,54,62,39,47,55,63
156 * Local inline functions.
159 /*****************************************************************************
160 * NextStartCode : Find the next start code
161 *****************************************************************************/
162 static __inline__ void NextStartCode( vpar_thread_t * p_vpar )
164 /* Re-align the buffer on an 8-bit boundary */
165 RealignBits( &p_vpar->bit_stream );
167 while( ShowBits( &p_vpar->bit_stream, 24 ) != 0x01L && !p_vpar->b_die )
169 RemoveBits( &p_vpar->bit_stream, 8 );
173 /*****************************************************************************
174 * ReferenceUpdate : Update the reference pointers when we have a new picture
175 *****************************************************************************/
176 static void __inline__ ReferenceUpdate( vpar_thread_t * p_vpar,
178 picture_t * p_newref )
180 if( i_coding_type != B_CODING_TYPE )
182 if( p_vpar->sequence.p_forward != NULL )
183 vout_UnlinkPicture( p_vpar->p_vout, p_vpar->sequence.p_forward );
184 p_vpar->sequence.p_forward = p_vpar->sequence.p_backward;
185 p_vpar->sequence.p_backward = p_newref;
186 if( p_newref != NULL )
187 vout_LinkPicture( p_vpar->p_vout, p_newref );
191 /*****************************************************************************
192 * ReferenceReplace : Replace the last reference pointer when we destroy
194 *****************************************************************************/
195 static void __inline__ ReferenceReplace( vpar_thread_t * p_vpar,
197 picture_t * p_newref )
199 if( i_coding_type != B_CODING_TYPE )
201 if( p_vpar->sequence.p_backward != NULL )
202 vout_UnlinkPicture( p_vpar->p_vout, p_vpar->sequence.p_backward );
203 p_vpar->sequence.p_backward = p_newref;
204 if( p_newref != NULL )
205 vout_LinkPicture( p_vpar->p_vout, p_newref );
209 /*****************************************************************************
210 * LoadMatrix : Load a quantization matrix
211 *****************************************************************************/
212 static __inline__ void LoadMatrix( vpar_thread_t * p_vpar, quant_matrix_t * p_matrix )
216 if( !p_matrix->b_allocated )
218 /* Allocate a piece of memory to load the matrix. */
219 p_matrix->pi_matrix = (int *)malloc( 64*sizeof(int) );
220 p_matrix->b_allocated = 1;
223 for( i_dummy = 0; i_dummy < 64; i_dummy++ )
225 p_matrix->pi_matrix[pi_scan[SCAN_ZIGZAG][i_dummy]]
226 = GetBits( &p_vpar->bit_stream, 8 );
230 /* Discrete Fourier Transform requires the quantization matrices to
231 * be normalized before using them. */
232 vdec_NormQuantMatrix( p_matrix->pi_matrix );
236 /*****************************************************************************
237 * LinkMatrix : Link a quantization matrix to another
238 *****************************************************************************/
239 static __inline__ void LinkMatrix( quant_matrix_t * p_matrix, int * pi_array )
243 if( p_matrix->b_allocated )
245 /* Deallocate the piece of memory. */
246 free( p_matrix->pi_matrix );
247 p_matrix->b_allocated = 0;
250 p_matrix->pi_matrix = pi_array;
254 * Exported functions.
257 /*****************************************************************************
258 * vpar_NextSequenceHeader : Find the next sequence header
259 *****************************************************************************/
260 int vpar_NextSequenceHeader( vpar_thread_t * p_vpar )
262 while( !p_vpar->b_die )
264 NextStartCode( p_vpar );
265 if( ShowBits( &p_vpar->bit_stream, 32 ) == SEQUENCE_HEADER_CODE )
267 RemoveBits( &p_vpar->bit_stream, 8 );
272 /*****************************************************************************
273 * vpar_ParseHeader : Parse the next header
274 *****************************************************************************/
275 int vpar_ParseHeader( vpar_thread_t * p_vpar )
277 while( !p_vpar->b_die )
279 NextStartCode( p_vpar );
280 switch( GetBits32( &p_vpar->bit_stream ) )
282 case SEQUENCE_HEADER_CODE:
283 fprintf( stderr, "begin sequence header\n" );
284 SequenceHeader( p_vpar );
285 fprintf( stderr, "end sequence header\n" );
289 case GROUP_START_CODE:
290 fprintf( stderr, "begin group\n" );
291 GroupHeader( p_vpar );
292 fprintf( stderr, "end group\n" );
296 case PICTURE_START_CODE:
297 PictureHeader( p_vpar );
301 case SEQUENCE_END_CODE:
302 fprintf( stderr, "sequence header end code\n" );
314 * Following functions are local
317 /*****************************************************************************
318 * SequenceHeader : Parse the next sequence header
319 *****************************************************************************/
320 static void SequenceHeader( vpar_thread_t * p_vpar )
323 static float r_frame_rate_table[16] =
326 ((23.0*1000.0)/1001.0),
329 ((30.0*1000.0)/1001.0),
332 ((60.0*1000.0)/1001.0),
334 RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED
338 int i_height_save, i_width_save;
340 i_height_save = p_vpar->sequence.i_height;
341 i_width_save = p_vpar->sequence.i_width;
343 p_vpar->sequence.i_width = GetBits( &p_vpar->bit_stream, 12 );
344 p_vpar->sequence.i_height = GetBits( &p_vpar->bit_stream, 12 );
345 p_vpar->sequence.i_aspect_ratio = GetBits( &p_vpar->bit_stream, 4 );
346 p_vpar->sequence.r_frame_rate =
347 r_frame_rate_table[ GetBits( &p_vpar->bit_stream, 4 ) ];
349 /* We don't need bit_rate_value, marker_bit, vbv_buffer_size,
350 * constrained_parameters_flag */
351 RemoveBits( &p_vpar->bit_stream, 30 );
354 * Quantization matrices
356 if( GetBits( &p_vpar->bit_stream, 1 ) ) /* load_intra_quantizer_matrix */
358 LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
362 /* Use default matrix. */
363 LinkMatrix( &p_vpar->sequence.intra_quant, pi_default_intra_quant );
366 if( GetBits( &p_vpar->bit_stream, 1 ) ) /* load_non_intra_quantizer_matrix */
368 LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
372 /* Use default matrix. */
373 LinkMatrix( &p_vpar->sequence.nonintra_quant, pi_default_nonintra_quant );
376 /* Unless later overwritten by a matrix extension, we have the same
377 * matrices for luminance and chrominance. */
378 LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
379 p_vpar->sequence.intra_quant.pi_matrix );
380 LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
381 p_vpar->sequence.nonintra_quant.pi_matrix );
386 NextStartCode( p_vpar );
387 if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
390 static f_chroma_pattern_t ppf_chroma_pattern[4] =
391 {NULL, vpar_CodedPattern420,
392 vpar_CodedPattern422, vpar_CodedPattern444};
394 /* Turn the MPEG2 flag on */
395 p_vpar->sequence.b_mpeg2 = 1;
397 /* Parse sequence_extension */
398 RemoveBits32( &p_vpar->bit_stream );
399 /* extension_start_code_identifier, profile_and_level_indication */
400 RemoveBits( &p_vpar->bit_stream, 12 );
401 p_vpar->sequence.b_progressive = GetBits( &p_vpar->bit_stream, 1 );
402 p_vpar->sequence.i_chroma_format = GetBits( &p_vpar->bit_stream, 2 );
403 p_vpar->sequence.pf_decode_pattern = ppf_chroma_pattern
404 [p_vpar->sequence.i_chroma_format];
405 p_vpar->sequence.i_width |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
406 p_vpar->sequence.i_height |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
407 /* bit_rate_extension, marker_bit, vbv_buffer_size_extension, low_delay */
408 RemoveBits( &p_vpar->bit_stream, 22 );
409 /* frame_rate_extension_n */
410 i_dummy = GetBits( &p_vpar->bit_stream, 2 );
411 /* frame_rate_extension_d */
412 p_vpar->sequence.r_frame_rate *= (i_dummy + 1)
413 / (GetBits( &p_vpar->bit_stream, 5 ) + 1);
415 p_vpar->sequence.pf_decode_mv = vpar_MPEG2MotionVector;
419 /* It's an MPEG-1 stream. Put adequate parameters. */
421 p_vpar->sequence.b_mpeg2 = 0;
422 p_vpar->sequence.b_progressive = 1;
423 p_vpar->sequence.i_chroma_format = CHROMA_420;
424 p_vpar->sequence.pf_decode_pattern = vpar_CodedPattern420;
426 p_vpar->sequence.pf_decode_mv = vpar_MPEG1MotionVector;
430 p_vpar->sequence.i_mb_width = (p_vpar->sequence.i_width + 15) / 16;
431 p_vpar->sequence.i_mb_height = (p_vpar->sequence.b_progressive) ?
432 (p_vpar->sequence.i_height + 15) / 16 :
433 2 * (p_vpar->sequence.i_height + 31) / 32;
434 p_vpar->sequence.i_mb_size = p_vpar->sequence.i_mb_width
435 * p_vpar->sequence.i_mb_height;
436 p_vpar->sequence.i_width = (p_vpar->sequence.i_mb_width * 16);
437 p_vpar->sequence.i_height = (p_vpar->sequence.i_mb_height * 16);
438 p_vpar->sequence.i_size = p_vpar->sequence.i_width
439 * p_vpar->sequence.i_height;
441 /* Update chromatic information */
442 switch( p_vpar->sequence.i_chroma_format )
445 p_vpar->sequence.i_chroma_nb_blocks = 2;
446 p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width >> 2;
447 p_vpar->sequence.i_chroma_mb_width = 8;
448 p_vpar->sequence.i_chroma_mb_height = 8;
452 p_vpar->sequence.i_chroma_nb_blocks = 4;
453 p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width >> 1;
454 p_vpar->sequence.i_chroma_mb_width = 8;
455 p_vpar->sequence.i_chroma_mb_height = 16;
459 p_vpar->sequence.i_chroma_nb_blocks = 8;
460 p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width;
461 p_vpar->sequence.i_chroma_mb_width = 16;
462 p_vpar->sequence.i_chroma_mb_height = 16;
465 /* Slice Header functions */
466 if( p_vpar->sequence.i_height <= 2800 )
468 if( p_vpar->sequence.i_scalable_mode != SC_DP )
470 p_vpar->sequence.pf_slice_header = SliceHeader00;
474 p_vpar->sequence.pf_slice_header = SliceHeader01;
479 if( p_vpar->sequence.i_scalable_mode != SC_DP )
481 p_vpar->sequence.pf_slice_header = SliceHeader10;
485 p_vpar->sequence.pf_slice_header = SliceHeader11;
489 if( p_vpar->sequence.i_width != i_width_save
490 || p_vpar->sequence.i_height != i_height_save )
492 /* What do we do in case of a size change ??? */
495 /* Extension and User data */
496 ExtensionAndUserData( p_vpar );
499 /*****************************************************************************
500 * GroupHeader : Parse the next group of pictures header
501 *****************************************************************************/
502 static void GroupHeader( vpar_thread_t * p_vpar )
504 /* Nothing to do, we don't care. */
505 RemoveBits( &p_vpar->bit_stream, 27 );
506 ExtensionAndUserData( p_vpar );
509 /*****************************************************************************
510 * PictureHeader : Parse the next picture header
511 *****************************************************************************/
512 static void PictureHeader( vpar_thread_t * p_vpar )
514 static f_macroblock_type_t ppf_macroblock_type[5] = {NULL,
515 vpar_IMBType, vpar_PMBType,
516 vpar_BMBType, vpar_DMBType};
519 int i_mb_address, i_mb_base, i_mb;
520 elem_t * p_y, p_u, p_v;
521 boolean_t b_parsable;
524 RemoveBits( &p_vpar->bit_stream, 10 ); /* temporal_reference */
525 p_vpar->picture.i_coding_type = GetBits( &p_vpar->bit_stream, 3 );
526 p_vpar->picture.pf_macroblock_type = ppf_macroblock_type
527 [p_vpar->picture.i_coding_type];
528 RemoveBits( &p_vpar->bit_stream, 16 ); /* vbv_delay */
530 if( p_vpar->picture.i_coding_type == P_CODING_TYPE || p_vpar->picture.i_coding_type == B_CODING_TYPE )
532 p_vpar->picture.pb_full_pel_vector[0] = GetBits( &p_vpar->bit_stream, 1 );
533 p_vpar->picture.i_forward_f_code = GetBits( &p_vpar->bit_stream, 3 );
535 if( p_vpar->picture.i_coding_type == B_CODING_TYPE )
537 p_vpar->picture.pb_full_pel_vector[1] = GetBits( &p_vpar->bit_stream, 1 );
538 p_vpar->picture.i_backward_f_code = GetBits( &p_vpar->bit_stream, 3 );
541 /* extra_information_picture */
542 while( GetBits( &p_vpar->bit_stream, 1 ) )
544 RemoveBits( &p_vpar->bit_stream, 8 );
548 * Picture Coding Extension
550 NextStartCode( p_vpar );
551 if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
553 /* Parse picture_coding_extension */
554 RemoveBits32( &p_vpar->bit_stream );
555 /* extension_start_code_identifier */
556 RemoveBits( &p_vpar->bit_stream, 4 );
558 p_vpar->picture.ppi_f_code[0][0] = GetBits( &p_vpar->bit_stream, 4 );
559 p_vpar->picture.ppi_f_code[0][1] = GetBits( &p_vpar->bit_stream, 4 );
560 p_vpar->picture.ppi_f_code[1][0] = GetBits( &p_vpar->bit_stream, 4 );
561 p_vpar->picture.ppi_f_code[1][1] = GetBits( &p_vpar->bit_stream, 4 );
562 p_vpar->picture.i_intra_dc_precision = GetBits( &p_vpar->bit_stream, 2 );
563 i_structure = GetBits( &p_vpar->bit_stream, 2 );
564 p_vpar->picture.b_top_field_first = GetBits( &p_vpar->bit_stream, 1 );
565 p_vpar->picture.b_frame_pred_frame_dct
566 = GetBits( &p_vpar->bit_stream, 1 );
567 p_vpar->picture.b_concealment_mv = GetBits( &p_vpar->bit_stream, 1 );
568 p_vpar->picture.b_q_scale_type = GetBits( &p_vpar->bit_stream, 1 );
569 p_vpar->picture.b_intra_vlc_format = GetBits( &p_vpar->bit_stream, 1 );
570 p_vpar->picture.b_alternate_scan = GetBits( &p_vpar->bit_stream, 1 );
571 p_vpar->picture.b_repeat_first_field = GetBits( &p_vpar->bit_stream, 1 );
572 /* repeat_first_field (ISO/IEC 13818-2 6.3.10 is necessary to know
573 * the length of the picture_display_extension structure.
574 * chroma_420_type (obsolete) */
575 RemoveBits( &p_vpar->bit_stream, 1 );
576 p_vpar->picture.b_progressive_frame = GetBits( &p_vpar->bit_stream, 1 );
578 /* composite_display_flag */
579 if( GetBits( &p_vpar->bit_stream, 1 ) )
581 /* v_axis, field_sequence, sub_carrier, burst_amplitude,
582 * sub_carrier_phase */
583 RemoveBits( &p_vpar->bit_stream, 20 );
588 /* MPEG-1 compatibility flags */
589 p_vpar->picture.i_intra_dc_precision = 0; /* 8 bits */
590 i_structure = FRAME_STRUCTURE;
591 p_vpar->picture.b_frame_pred_frame_dct = 1;
592 p_vpar->picture.b_concealment_mv = 0;
593 p_vpar->picture.b_q_scale_type = 0;
594 p_vpar->picture.b_intra_vlc_format = 0;
595 p_vpar->picture.b_alternate_scan = 0; /* zigzag */
596 p_vpar->picture.b_repeat_first_field = 0;
597 p_vpar->picture.b_progressive_frame = 1;
600 if( p_vpar->picture.i_current_structure &&
601 (i_structure == FRAME_STRUCTURE ||
602 i_structure == p_vpar->picture.i_current_structure) )
604 /* We don't have the second field of the buffered frame. */
605 if( p_vpar->picture.p_picture != NULL )
607 ReferenceReplace( p_vpar,
608 p_vpar->picture.i_coding_type,
611 for( i_mb = 0; i_mb < p_vpar->sequence.i_mb_size >> 1; i_mb++ )
613 vpar_DestroyMacroblock( &p_vpar->vfifo,
614 p_vpar->picture.pp_mb[i_mb] );
616 vout_DestroyPicture( p_vpar->p_vout, p_vpar->picture.p_picture );
619 p_vpar->picture.i_current_structure = 0;
621 intf_DbgMsg("vpar debug: odd number of field picture.\n");
624 if( p_vpar->picture.i_current_structure )
626 /* Second field of a frame. We will decode it if, and only if we
627 * have decoded the first frame. */
628 b_parsable = (p_vpar->picture.p_picture != NULL);
632 /* Do we have the reference pictures ? */
633 b_parsable = !((p_vpar->picture.i_coding_type == P_CODING_TYPE) &&
634 (p_vpar->sequence.p_forward == NULL)) ||
635 ((p_vpar->picture.i_coding_type == B_CODING_TYPE) &&
636 (p_vpar->sequence.p_forward == NULL ||
637 p_vpar->sequence.p_backward == NULL));
641 /* Does synchro say we have enough time to decode it ? */
642 b_parsable = vpar_SynchroChoose( p_vpar,
643 p_vpar->picture.i_coding_type, i_structure );
649 /* Update the reference pointers. */
650 ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, NULL );
652 /* Warn Synchro we have trashed a picture. */
653 vpar_SynchroTrash( p_vpar, p_vpar->picture.i_coding_type, i_structure );
655 /* Update context. */
656 if( i_structure != FRAME_STRUCTURE )
657 p_vpar->picture.i_current_structure = i_structure;
658 p_vpar->picture.p_picture = NULL;
662 fprintf(stderr, "begin picture\n");
664 /* OK, now we are sure we will decode the picture. */
665 #define P_picture p_vpar->picture.p_picture
666 p_vpar->picture.b_error = 0;
668 if( !p_vpar->picture.i_current_structure )
670 /* This is a new frame. Get a structure from the video_output. */
671 P_picture = vout_CreatePicture( p_vpar->p_vout,
672 99+p_vpar->sequence.i_chroma_format, /*???*/
673 p_vpar->sequence.i_width,
674 p_vpar->sequence.i_height,
675 p_vpar->sequence.i_width*sizeof(yuv_data_t) );
677 /* Initialize values. */
678 P_picture->date = vpar_SynchroDecode( p_vpar,
679 p_vpar->picture.i_coding_type,
681 p_vpar->picture.i_l_stride = - 8 + ( p_vpar->sequence.i_width
682 << ( 1 - p_vpar->picture.b_frame_structure ) );
683 p_vpar->picture.i_c_stride = -8 + ( p_vpar->sequence.i_width
684 << (( 1 - p_vpar->picture.b_frame_structure ) +
685 ( 3 - p_vpar->sequence.i_chroma_format )) );
687 /* Update the reference pointers. */
688 ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, P_picture );
690 p_vpar->picture.i_current_structure |= i_structure;
691 p_vpar->picture.i_structure = i_structure;
692 p_vpar->picture.b_frame_structure = (i_structure == FRAME_STRUCTURE);
694 /* Initialize picture data for decoding. */
695 if( i_structure == BOTTOM_FIELD )
697 i_mb_base = p_vpar->sequence.i_mb_size >> 1;
698 p_vpar->mb.i_l_y = 16;
699 p_vpar->mb.i_c_y = p_vpar->sequence.i_chroma_mb_height;
704 p_vpar->mb.i_l_y = p_vpar->mb.i_c_y = 0;
707 p_vpar->mb.i_l_x = p_vpar->mb.i_c_x = 0;
709 /* Extension and User data. */
710 ExtensionAndUserData( p_vpar );
712 /* Picture data (ISO/IEC 13818-2 6.2.3.7). */
713 NextStartCode( p_vpar );
714 while( i_mb_address+i_mb_base < p_vpar->sequence.i_mb_size
715 && !p_vpar->picture.b_error && !p_vpar->b_die )
717 if( ((i_dummy = ShowBits( &p_vpar->bit_stream, 32 ))
718 < SLICE_START_CODE_MIN) ||
719 (i_dummy > SLICE_START_CODE_MAX) )
721 intf_DbgMsg("vpar debug: premature end of picture");
722 p_vpar->picture.b_error = 1;
725 RemoveBits32( &p_vpar->bit_stream );
727 /* Decode slice data. */
728 p_vpar->sequence.pf_slice_header( p_vpar, &i_mb_address, i_mb_base, i_dummy & 255 );
731 if( p_vpar->picture.b_error )
734 fprintf(stderr, "Image trashee\n");
735 for( i_mb = 0; p_vpar->picture.pp_mb[i_mb]; i_mb++ )
737 vpar_DestroyMacroblock( &p_vpar->vfifo, p_vpar->picture.pp_mb[i_mb] );
740 ReferenceReplace( p_vpar, p_vpar->picture.i_coding_type, NULL );
741 vout_DestroyPicture( p_vpar->p_vout, P_picture );
743 /* Prepare context for the next picture. */
745 if( p_vpar->picture.i_current_structure == FRAME_STRUCTURE )
746 p_vpar->picture.i_current_structure = 0;
748 else if( p_vpar->picture.i_current_structure == FRAME_STRUCTURE )
750 fprintf(stderr, "Image decodee\n");
751 /* Frame completely parsed. */
752 P_picture->i_deccount = p_vpar->sequence.i_mb_size;
753 for( i_mb = 0; i_mb < p_vpar->sequence.i_mb_size; i_mb++ )
755 vpar_DecodeMacroblock( &p_vpar->vfifo, p_vpar->picture.pp_mb[i_mb] );
758 /* Link referenced pictures for the decoder
759 * They are unlinked in vpar_ReleaseMacroblock() & vpar_DestroyMacroblock() */
760 if( p_vpar->sequence.p_forward != NULL )
762 vout_LinkPicture( p_vpar->p_vout, p_vpar->sequence.p_forward );
764 if( p_vpar->sequence.p_backward != NULL )
766 vout_LinkPicture( p_vpar->p_vout, p_vpar->sequence.p_backward );
769 /* Prepare context for the next picture. */
771 p_vpar->picture.i_current_structure = 0;
776 /*****************************************************************************
777 * SliceHeader : Parse the next slice structure
778 *****************************************************************************/
779 static __inline__ void SliceHeader( vpar_thread_t * p_vpar,
780 int * pi_mb_address, int i_mb_base,
783 /* DC predictors initialization table */
784 static int pi_dc_dct_reinit[4] = {128,256,512,1024};
786 int i_mb_address_save = *pi_mb_address;
788 /* slice_vertical_position_extension and priority_breakpoint already done */
789 LoadQuantizerScale( p_vpar );
791 if( GetBits( &p_vpar->bit_stream, 1 ) )
793 /* intra_slice, slice_id */
794 RemoveBits( &p_vpar->bit_stream, 8 );
795 /* extra_information_slice */
796 while( GetBits( &p_vpar->bit_stream, 1 ) )
798 RemoveBits( &p_vpar->bit_stream, 8 );
801 *pi_mb_address = (i_vert_code - 1)*p_vpar->sequence.i_mb_width;
803 /* Reset DC coefficients predictors (ISO/IEC 13818-2 7.2.1). Why
804 * does the reference decoder put 0 instead of the normative values ? */
805 p_vpar->slice.pi_dc_dct_pred[0] = p_vpar->slice.pi_dc_dct_pred[1]
806 = p_vpar->slice.pi_dc_dct_pred[2]
807 = pi_dc_dct_reinit[p_vpar->picture.i_intra_dc_precision];
809 /* Reset motion vector predictors (ISO/IEC 13818-2 7.6.3.4). */
810 memset( p_vpar->slice.pppi_pmv, 0, 8*sizeof(int) );
814 vpar_ParseMacroblock( p_vpar, pi_mb_address, i_mb_address_save,
816 i_mb_address_save = *pi_mb_address;
818 while( ShowBits( &p_vpar->bit_stream, 23 ) && !p_vpar->b_die );
819 NextStartCode( p_vpar );
822 /*****************************************************************************
823 * SliceHeaderXY : Parse the next slice structure
824 *****************************************************************************
825 * X = i_height > 2800 ?
826 * Y = scalable_mode == SC_DP ?
827 *****************************************************************************/
828 static void SliceHeader00( vpar_thread_t * p_vpar,
829 int * pi_mb_address, int i_mb_base,
832 SliceHeader( p_vpar, pi_mb_address, i_mb_base, i_vert_code );
835 static void SliceHeader01( vpar_thread_t * p_vpar,
836 int * pi_mb_address, int i_mb_base,
839 RemoveBits( &p_vpar->bit_stream, 7 ); /* priority_breakpoint */
840 SliceHeader( p_vpar, pi_mb_address, i_mb_base, i_vert_code );
843 static void SliceHeader10( vpar_thread_t * p_vpar,
844 int * pi_mb_address, int i_mb_base,
847 i_vert_code += GetBits( &p_vpar->bit_stream, 3 ) << 7;
848 SliceHeader( p_vpar, pi_mb_address, i_mb_base, i_vert_code );
851 static void SliceHeader11( vpar_thread_t * p_vpar,
852 int * pi_mb_address, int i_mb_base,
855 i_vert_code += GetBits( &p_vpar->bit_stream, 3 ) << 7;
856 RemoveBits( &p_vpar->bit_stream, 7 ); /* priority_breakpoint */
857 SliceHeader( p_vpar, pi_mb_address, i_mb_base, i_vert_code );
860 /*****************************************************************************
861 * ExtensionAndUserData : Parse the extension_and_user_data structure
862 *****************************************************************************/
863 static void ExtensionAndUserData( vpar_thread_t * p_vpar )
865 while( !p_vpar->b_die )
867 NextStartCode( p_vpar );
868 switch( ShowBits( &p_vpar->bit_stream, 32 ) )
870 case EXTENSION_START_CODE:
871 RemoveBits32( &p_vpar->bit_stream );
872 switch( GetBits( &p_vpar->bit_stream, 4 ) )
874 case SEQUENCE_DISPLAY_EXTENSION_ID:
875 SequenceDisplayExtension( p_vpar );
877 case QUANT_MATRIX_EXTENSION_ID:
878 QuantMatrixExtension( p_vpar );
880 case SEQUENCE_SCALABLE_EXTENSION_ID:
881 SequenceScalableExtension( p_vpar );
883 case PICTURE_DISPLAY_EXTENSION_ID:
884 PictureDisplayExtension( p_vpar );
886 case PICTURE_SPATIAL_SCALABLE_EXTENSION_ID:
887 PictureSpatialScalableExtension( p_vpar );
889 case PICTURE_TEMPORAL_SCALABLE_EXTENSION_ID:
890 PictureTemporalScalableExtension( p_vpar );
892 case COPYRIGHT_EXTENSION_ID:
893 CopyrightExtension( p_vpar );
899 case USER_DATA_START_CODE:
900 RemoveBits32( &p_vpar->bit_stream );
901 /* Wait for the next start code */
911 /*****************************************************************************
912 * SequenceDisplayExtension : Parse the sequence_display_extension structure *
913 *****************************************************************************/
915 static void SequenceDisplayExtension( vpar_thread_t * p_vpar )
917 /* We don't care sequence_display_extension. */
919 RemoveBits( &p_vpar->bit_stream, 3 );
920 if( GetBits( &p_vpar->bit_stream, 1 ) )
922 /* Three bytes for color_desciption */
923 RemoveBits( &p_vpar->bit_stream, 24 );
925 /* display_horizontal and vertical_size and a marker_bit */
926 RemoveBits( &p_vpar->bit_stream, 29 );
930 /*****************************************************************************
931 * QuantMatrixExtension : Load quantization matrices for luminance *
933 *****************************************************************************/
935 static void QuantMatrixExtension( vpar_thread_t * p_vpar )
937 if( GetBits( &p_vpar->bit_stream, 1 ) )
939 /* Load intra_quantiser_matrix for luminance. */
940 LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
944 /* Use the default matrix. */
945 LinkMatrix( &p_vpar->sequence.intra_quant,
946 pi_default_intra_quant );
948 if( GetBits( &p_vpar->bit_stream, 1 ) )
950 /* Load non_intra_quantiser_matrix for luminance. */
951 LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
955 /* Use the default matrix. */
956 LinkMatrix( &p_vpar->sequence.nonintra_quant,
957 pi_default_nonintra_quant );
959 if( GetBits( &p_vpar->bit_stream, 1 ) )
961 /* Load intra_quantiser_matrix for chrominance. */
962 LoadMatrix( p_vpar, &p_vpar->sequence.chroma_intra_quant );
966 /* Link the chrominance intra matrix to the luminance one. */
967 LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
968 p_vpar->sequence.intra_quant.pi_matrix );
970 if( GetBits( &p_vpar->bit_stream, 1 ) )
972 /* Load non_intra_quantiser_matrix for chrominance. */
973 LoadMatrix( p_vpar, &p_vpar->sequence.chroma_nonintra_quant );
977 /* Link the chrominance intra matrix to the luminance one. */
978 LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
979 p_vpar->sequence.intra_quant.pi_matrix );
981 if( GetBits( &p_vpar->bit_stream, 1 ) )
983 /* Load non_intra_quantiser_matrix for chrominance. */
984 LoadMatrix( p_vpar, &p_vpar->sequence.chroma_nonintra_quant );
988 /* Link the chrominance nonintra matrix to the luminance one. */
989 LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
990 p_vpar->sequence.nonintra_quant.pi_matrix );
995 /*****************************************************************************
996 * SequenceScalableExtension : Parse the sequence_scalable_extension *
997 * structure to handle scalable coding *
998 *****************************************************************************/
1000 static void SequenceScalableExtension( vpar_thread_t * p_vpar )
1002 /* We don't care about anything scalable except the scalable mode. */
1003 switch( p_vpar->sequence.i_scalable_mode = GetBits( &p_vpar->bit_stream, 2 ) )
1004 /* The length of the structure depends on the value of the scalable_mode */
1007 RemoveBits32( &p_vpar->bit_stream );
1008 RemoveBits( &p_vpar->bit_stream, 21 );
1011 RemoveBits( &p_vpar->bit_stream, 12 );
1014 RemoveBits( &p_vpar->bit_stream, 4 );
1018 /*****************************************************************************
1019 * PictureDisplayExtension : Parse the picture_display_extension structure *
1020 *****************************************************************************/
1022 static void PictureDisplayExtension( vpar_thread_t * p_vpar )
1024 /* Number of frame center offset */
1026 /* I am not sure it works but it should
1027 (fewer tests than shown in ยง6.3.12) */
1028 nb = p_vpar->sequence.b_progressive ? p_vpar->sequence.b_progressive +
1029 p_vpar->picture.b_repeat_first_field +
1030 p_vpar->picture.b_top_field_first
1031 : ( p_vpar->picture.b_frame_structure + 1 ) +
1032 p_vpar->picture.b_repeat_first_field;
1033 RemoveBits( &p_vpar->bit_stream, 34 * nb );
1037 /*****************************************************************************
1038 * PictureSpatialScalableExtension *
1039 *****************************************************************************/
1041 static void PictureSpatialScalableExtension( vpar_thread_t * p_vpar )
1043 /* That's scalable, so we trash it */
1044 RemoveBits32( &p_vpar->bit_stream );
1045 RemoveBits( &p_vpar->bit_stream, 16 );
1049 /*****************************************************************************
1050 * PictureTemporalScalableExtension *
1051 *****************************************************************************/
1053 static void PictureTemporalScalableExtension( vpar_thread_t * p_vpar )
1055 /* Scalable again, trashed again */
1056 RemoveBits( &p_vpar->bit_stream, 23 );
1060 /*****************************************************************************
1061 * CopyrightExtension : Keeps some legal informations *
1062 *****************************************************************************/
1064 static void CopyrightExtension( vpar_thread_t * p_vpar )
1066 u32 i_copyright_nb_1, i_copyright_nb_2; /* local integers */
1067 p_vpar->sequence.b_copyright_flag = GetBits( &p_vpar->bit_stream, 1 );
1068 /* A flag that says whether the copyright information is significant */
1069 p_vpar->sequence.i_copyright_id = GetBits( &p_vpar->bit_stream, 8 );
1070 /* An identifier compliant with ISO/CEI JTC 1/SC 29 */
1071 p_vpar->sequence.b_original = GetBits( &p_vpar->bit_stream, 1 );
1073 RemoveBits( &p_vpar->bit_stream, 8 );
1074 /* The copyright_number is split in three parts */
1076 i_copyright_nb_1 = GetBits( &p_vpar->bit_stream, 20 );
1077 RemoveBits( &p_vpar->bit_stream, 1 );
1079 i_copyright_nb_2 = GetBits( &p_vpar->bit_stream, 22 );
1080 RemoveBits( &p_vpar->bit_stream, 1 );
1081 /* third part and sum */
1082 p_vpar->sequence.i_copyright_nb = ( (u64)i_copyright_nb_1 << 44 ) +
1083 ( (u64)i_copyright_nb_2 << 22 ) +
1084 ( (u64)GetBits( &p_vpar->bit_stream, 22 ) );