1 /*****************************************************************************
2 * vpar_headers.c : headers parsing
3 *****************************************************************************
4 * Copyright (C) 1999, 2000 VideoLAN
5 * $Id: vpar_headers.c,v 1.79 2001/02/19 19:08:59 massiot Exp $
7 * Authors: Christophe Massiot <massiot@via.ecp.fr>
8 * Stéphane Borel <stef@via.ecp.fr>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
30 #include <stdlib.h> /* free() */
39 #include "stream_control.h"
40 #include "input_ext-dec.h"
43 #include "video_output.h"
45 #include "video_decoder.h"
46 #include "vdec_motion.h"
47 #include "../video_decoder/vdec_idct.h"
49 #include "vpar_blocks.h"
50 #include "../video_decoder/vpar_headers.h"
51 #include "../video_decoder/vpar_synchro.h"
52 #include "../video_decoder/video_parser.h"
53 #include "../video_decoder/video_fifo.h"
58 static __inline__ void NextStartCode( bit_stream_t * );
59 static void SequenceHeader( vpar_thread_t * p_vpar );
60 static void GroupHeader( vpar_thread_t * p_vpar );
61 static void PictureHeader( vpar_thread_t * p_vpar );
62 static void ExtensionAndUserData( vpar_thread_t * p_vpar );
63 static void QuantMatrixExtension( vpar_thread_t * p_vpar );
64 static void SequenceScalableExtension( vpar_thread_t * p_vpar );
65 static void SequenceDisplayExtension( vpar_thread_t * p_vpar );
66 static void PictureDisplayExtension( vpar_thread_t * p_vpar );
67 static void PictureSpatialScalableExtension( vpar_thread_t * p_vpar );
68 static void PictureTemporalScalableExtension( vpar_thread_t * p_vpar );
69 static void CopyrightExtension( vpar_thread_t * p_vpar );
75 /*****************************************************************************
76 * pi_default_intra_quant : default quantization matrix
77 *****************************************************************************/
78 u8 pi_default_intra_quant[] =
80 8, 16, 19, 22, 26, 27, 29, 34,
81 16, 16, 22, 24, 27, 29, 34, 37,
82 19, 22, 26, 27, 29, 34, 34, 38,
83 22, 22, 26, 27, 29, 34, 37, 40,
84 22, 26, 27, 29, 32, 35, 40, 48,
85 26, 27, 29, 32, 35, 40, 48, 58,
86 26, 27, 29, 34, 38, 46, 56, 69,
87 27, 29, 35, 38, 46, 56, 69, 83
90 /*****************************************************************************
91 * pi_default_nonintra_quant : default quantization matrix
92 *****************************************************************************/
93 u8 pi_default_nonintra_quant[] =
95 16, 16, 16, 16, 16, 16, 16, 16,
96 16, 16, 16, 16, 16, 16, 16, 16,
97 16, 16, 16, 16, 16, 16, 16, 16,
98 16, 16, 16, 16, 16, 16, 16, 16,
99 16, 16, 16, 16, 16, 16, 16, 16,
100 16, 16, 16, 16, 16, 16, 16, 16,
101 16, 16, 16, 16, 16, 16, 16, 16,
102 16, 16, 16, 16, 16, 16, 16, 16
105 /*****************************************************************************
106 * pi_scan : zig-zag and alternate scan patterns
107 *****************************************************************************/
110 { /* Zig-Zag pattern */
111 0,1,8,16,9,2,3,10,17,24,32,25,18,11,4,5,
112 12,19,26,33,40,48,41,34,27,20,13,6,7,14,21,28,
113 35,42,49,56,57,50,43,36,29,22,15,23,30,37,44,51,
114 58,59,52,45,38,31,39,46,53,60,61,54,47,55,62,63
116 { /* Alternate scan pattern */
117 0,8,16,24,1,9,2,10,17,25,32,40,48,56,57,49,
118 41,33,26,18,3,11,4,12,19,27,34,42,50,58,35,43,
119 51,59,20,28,5,13,6,14,21,29,36,44,52,60,37,45,
120 53,61,22,30,7,15,23,31,38,46,54,62,39,47,55,63
125 * Local inline functions.
128 /*****************************************************************************
129 * ReferenceUpdate : Update the reference pointers when we have a new picture
130 *****************************************************************************/
131 static void __inline__ ReferenceUpdate( vpar_thread_t * p_vpar,
133 picture_t * p_newref )
135 if( i_coding_type != B_CODING_TYPE )
137 if( p_vpar->sequence.p_forward != NULL )
139 vout_UnlinkPicture( p_vpar->p_vout, p_vpar->sequence.p_forward );
141 if( p_vpar->sequence.p_backward != NULL )
143 vout_DatePicture( p_vpar->p_vout, p_vpar->sequence.p_backward,
144 vpar_SynchroDate( p_vpar ) );
146 p_vpar->sequence.p_forward = p_vpar->sequence.p_backward;
147 p_vpar->sequence.p_backward = p_newref;
148 if( p_newref != NULL )
150 vout_LinkPicture( p_vpar->p_vout, p_newref );
153 else if( p_newref != NULL )
155 /* Put date immediately. */
156 vout_DatePicture( p_vpar->p_vout, p_newref, vpar_SynchroDate(p_vpar) );
160 /*****************************************************************************
161 * ReferenceReplace : Replace the last reference pointer when we destroy
163 *****************************************************************************/
164 static void __inline__ ReferenceReplace( vpar_thread_t * p_vpar,
166 picture_t * p_newref )
168 if( i_coding_type != B_CODING_TYPE )
170 if( p_vpar->sequence.p_backward != NULL )
172 vout_UnlinkPicture( p_vpar->p_vout, p_vpar->sequence.p_backward );
174 p_vpar->sequence.p_backward = p_newref;
175 if( p_newref != NULL )
177 vout_LinkPicture( p_vpar->p_vout, p_newref );
182 /*****************************************************************************
183 * LoadMatrix : Load a quantization matrix
184 *****************************************************************************/
185 static __inline__ void LoadMatrix( vpar_thread_t * p_vpar,
186 quant_matrix_t * p_matrix )
190 if( !p_matrix->b_allocated )
192 /* Allocate a piece of memory to load the matrix. */
193 if( (p_matrix->pi_matrix = (u8 *)malloc( 64*sizeof(u8) )) == NULL )
195 intf_ErrMsg( "vpar error: allocation error in LoadMatrix()" );
196 p_vpar->p_fifo->b_error = 1;
199 p_matrix->b_allocated = 1;
202 for( i_dummy = 0; i_dummy < 64; i_dummy++ )
204 p_matrix->pi_matrix[p_vpar->ppi_scan[SCAN_ZIGZAG][i_dummy]]
205 = GetBits( &p_vpar->bit_stream, 8 );
209 /* Discrete Fourier Transform requires the quantization matrices to
210 * be normalized before using them. */
211 vdec_NormQuantMatrix( p_matrix->pi_matrix );
215 /*****************************************************************************
216 * LinkMatrix : Link a quantization matrix to another
217 *****************************************************************************/
218 static __inline__ void LinkMatrix( quant_matrix_t * p_matrix, u8 * pi_array )
220 if( p_matrix->b_allocated )
222 /* Deallocate the piece of memory. */
223 free( p_matrix->pi_matrix );
224 p_matrix->b_allocated = 0;
227 p_matrix->pi_matrix = pi_array;
231 * Exported functions.
234 /*****************************************************************************
235 * vpar_NextSequenceHeader : Find the next sequence header
236 *****************************************************************************/
237 int vpar_NextSequenceHeader( vpar_thread_t * p_vpar )
239 while( !p_vpar->p_fifo->b_die )
241 NextStartCode( &p_vpar->bit_stream );
242 if( ShowBits( &p_vpar->bit_stream, 32 ) == SEQUENCE_HEADER_CODE )
246 RemoveBits( &p_vpar->bit_stream, 8 );
251 /*****************************************************************************
252 * vpar_ParseHeader : Parse the next header
253 *****************************************************************************/
254 int vpar_ParseHeader( vpar_thread_t * p_vpar )
256 while( !p_vpar->p_fifo->b_die )
258 NextStartCode( &p_vpar->bit_stream );
259 switch( GetBits32( &p_vpar->bit_stream ) )
261 case SEQUENCE_HEADER_CODE:
263 p_vpar->c_sequences++;
265 SequenceHeader( p_vpar );
269 case GROUP_START_CODE:
270 GroupHeader( p_vpar );
274 case PICTURE_START_CODE:
275 PictureHeader( p_vpar );
279 case SEQUENCE_END_CODE:
280 intf_DbgMsg("vpar debug: sequence end code received");
292 * Following functions are local
295 /*****************************************************************************
296 * SequenceHeader : Parse the next sequence header
297 *****************************************************************************/
298 static void SequenceHeader( vpar_thread_t * p_vpar )
301 static int i_frame_rate_table[16] =
312 RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED
316 int i_height_save, i_width_save;
318 i_height_save = p_vpar->sequence.i_height;
319 i_width_save = p_vpar->sequence.i_width;
321 p_vpar->sequence.i_width = GetBits( &p_vpar->bit_stream, 12 );
322 p_vpar->sequence.i_height = GetBits( &p_vpar->bit_stream, 12 );
323 p_vpar->sequence.i_aspect_ratio = GetBits( &p_vpar->bit_stream, 4 );
324 p_vpar->sequence.i_frame_rate =
325 i_frame_rate_table[ GetBits( &p_vpar->bit_stream, 4 ) ];
327 /* We don't need bit_rate_value, marker_bit, vbv_buffer_size,
328 * constrained_parameters_flag */
329 RemoveBits( &p_vpar->bit_stream, 30 );
332 * Quantization matrices
334 if( GetBits( &p_vpar->bit_stream, 1 ) ) /* load_intra_quantizer_matrix */
336 LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
340 /* Use default matrix. */
341 LinkMatrix( &p_vpar->sequence.intra_quant,
342 p_vpar->pi_default_intra_quant );
345 if( GetBits( &p_vpar->bit_stream, 1 ) ) /* load_non_intra_quantizer_matrix */
347 LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
351 /* Use default matrix. */
352 LinkMatrix( &p_vpar->sequence.nonintra_quant,
353 p_vpar->pi_default_nonintra_quant );
356 /* Unless later overwritten by a matrix extension, we have the same
357 * matrices for luminance and chrominance. */
358 LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
359 p_vpar->sequence.intra_quant.pi_matrix );
360 LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
361 p_vpar->sequence.nonintra_quant.pi_matrix );
366 NextStartCode( &p_vpar->bit_stream );
367 if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
371 /* Turn the MPEG2 flag on */
372 p_vpar->sequence.b_mpeg2 = 1;
374 /* Parse sequence_extension */
375 RemoveBits32( &p_vpar->bit_stream );
376 /* extension_start_code_identifier, profile_and_level_indication */
377 RemoveBits( &p_vpar->bit_stream, 12 );
378 p_vpar->sequence.b_progressive = GetBits( &p_vpar->bit_stream, 1 );
379 p_vpar->sequence.i_chroma_format = GetBits( &p_vpar->bit_stream, 2 );
380 p_vpar->sequence.i_width |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
381 p_vpar->sequence.i_height |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
382 /* bit_rate_extension, marker_bit, vbv_buffer_size_extension, low_delay */
383 RemoveBits( &p_vpar->bit_stream, 22 );
384 /* frame_rate_extension_n */
385 i_dummy = GetBits( &p_vpar->bit_stream, 2 );
386 /* frame_rate_extension_d */
387 p_vpar->sequence.i_frame_rate *= (i_dummy + 1)
388 / (GetBits( &p_vpar->bit_stream, 5 ) + 1);
392 /* It's an MPEG-1 stream. Put adequate parameters. */
394 p_vpar->sequence.b_mpeg2 = 0;
395 p_vpar->sequence.b_progressive = 1;
396 p_vpar->sequence.i_chroma_format = CHROMA_420;
400 p_vpar->sequence.i_mb_width = (p_vpar->sequence.i_width + 15) / 16;
401 p_vpar->sequence.i_mb_height = (p_vpar->sequence.b_progressive) ?
402 (p_vpar->sequence.i_height + 15) / 16 :
403 2 * ((p_vpar->sequence.i_height + 31) / 32);
404 p_vpar->sequence.i_mb_size = p_vpar->sequence.i_mb_width
405 * p_vpar->sequence.i_mb_height;
406 p_vpar->sequence.i_width = (p_vpar->sequence.i_mb_width * 16);
407 p_vpar->sequence.i_height = (p_vpar->sequence.i_mb_height * 16);
408 p_vpar->sequence.i_size = p_vpar->sequence.i_width
409 * p_vpar->sequence.i_height;
411 /* Update chromatic information. */
412 switch( p_vpar->sequence.i_chroma_format )
415 p_vpar->sequence.i_chroma_nb_blocks = 2;
416 p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width >> 1;
417 p_vpar->sequence.i_chroma_mb_width = 8;
418 p_vpar->sequence.i_chroma_mb_height = 8;
422 p_vpar->sequence.i_chroma_nb_blocks = 4;
423 p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width >> 1;
424 p_vpar->sequence.i_chroma_mb_width = 8;
425 p_vpar->sequence.i_chroma_mb_height = 16;
429 p_vpar->sequence.i_chroma_nb_blocks = 8;
430 p_vpar->sequence.i_chroma_width = p_vpar->sequence.i_width;
431 p_vpar->sequence.i_chroma_mb_width = 16;
432 p_vpar->sequence.i_chroma_mb_height = 16;
435 /* Reset scalable_mode. */
436 p_vpar->sequence.i_scalable_mode = SC_NONE;
439 if( p_vpar->sequence.i_width != i_width_save
440 || p_vpar->sequence.i_height != i_height_save )
442 /* FIXME: What do we do in case of a size change ?? */
446 /* Extension and User data */
447 ExtensionAndUserData( p_vpar );
450 /*****************************************************************************
451 * GroupHeader : Parse the next group of pictures header
452 *****************************************************************************/
453 static void GroupHeader( vpar_thread_t * p_vpar )
455 /* Nothing to do, we don't care. */
456 RemoveBits( &p_vpar->bit_stream, 27 );
457 ExtensionAndUserData( p_vpar );
460 /*****************************************************************************
461 * PictureHeader : Parse the next picture header
462 *****************************************************************************/
463 static void PictureHeader( vpar_thread_t * p_vpar )
467 boolean_t b_parsable;
472 /* Recover in case of stream discontinuity. */
473 if( p_vpar->sequence.b_expect_discontinuity )
475 ReferenceUpdate( p_vpar, I_CODING_TYPE, NULL );
476 ReferenceUpdate( p_vpar, I_CODING_TYPE, NULL );
477 p_vpar->sequence.b_expect_discontinuity = 0;
480 /* Parse the picture header. */
481 RemoveBits( &p_vpar->bit_stream, 10 ); /* temporal_reference */
482 p_vpar->picture.i_coding_type = GetBits( &p_vpar->bit_stream, 3 );
483 RemoveBits( &p_vpar->bit_stream, 16 ); /* vbv_delay */
485 if( p_vpar->picture.i_coding_type == P_CODING_TYPE
486 || p_vpar->picture.i_coding_type == B_CODING_TYPE )
488 p_vpar->picture.pb_full_pel_vector[0] = GetBits( &p_vpar->bit_stream, 1 );
489 p_vpar->picture.i_forward_f_code = GetBits( &p_vpar->bit_stream, 3 );
491 if( p_vpar->picture.i_coding_type == B_CODING_TYPE )
493 p_vpar->picture.pb_full_pel_vector[1] = GetBits( &p_vpar->bit_stream, 1 );
494 p_vpar->picture.i_backward_f_code = GetBits( &p_vpar->bit_stream, 3 );
497 /* extra_information_picture */
498 while( GetBits( &p_vpar->bit_stream, 1 ) )
500 RemoveBits( &p_vpar->bit_stream, 8 );
504 * Picture Coding Extension
506 NextStartCode( &p_vpar->bit_stream );
507 if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
509 /* Parse picture_coding_extension */
510 RemoveBits32( &p_vpar->bit_stream );
511 /* extension_start_code_identifier */
512 RemoveBits( &p_vpar->bit_stream, 4 );
514 p_vpar->picture.ppi_f_code[0][0] = GetBits( &p_vpar->bit_stream, 4 );
515 p_vpar->picture.ppi_f_code[0][1] = GetBits( &p_vpar->bit_stream, 4 );
516 p_vpar->picture.ppi_f_code[1][0] = GetBits( &p_vpar->bit_stream, 4 );
517 p_vpar->picture.ppi_f_code[1][1] = GetBits( &p_vpar->bit_stream, 4 );
518 p_vpar->picture.i_intra_dc_precision = GetBits( &p_vpar->bit_stream, 2 );
519 i_structure = GetBits( &p_vpar->bit_stream, 2 );
520 p_vpar->picture.b_top_field_first = GetBits( &p_vpar->bit_stream, 1 );
521 p_vpar->picture.b_frame_pred_frame_dct
522 = GetBits( &p_vpar->bit_stream, 1 );
523 p_vpar->picture.b_concealment_mv = GetBits( &p_vpar->bit_stream, 1 );
524 p_vpar->picture.b_q_scale_type = GetBits( &p_vpar->bit_stream, 1 );
525 p_vpar->picture.b_intra_vlc_format = GetBits( &p_vpar->bit_stream, 1 );
526 p_vpar->picture.b_alternate_scan = GetBits( &p_vpar->bit_stream, 1 );
527 p_vpar->picture.b_repeat_first_field = GetBits( &p_vpar->bit_stream, 1 );
528 /* chroma_420_type (obsolete) */
529 RemoveBits( &p_vpar->bit_stream, 1 );
530 p_vpar->picture.b_progressive = GetBits( &p_vpar->bit_stream, 1 );
532 /* composite_display_flag */
533 if( GetBits( &p_vpar->bit_stream, 1 ) )
535 /* v_axis, field_sequence, sub_carrier, burst_amplitude,
536 * sub_carrier_phase */
537 RemoveBits( &p_vpar->bit_stream, 20 );
542 /* MPEG-1 compatibility flags */
543 p_vpar->picture.i_intra_dc_precision = 0; /* 8 bits */
544 i_structure = FRAME_STRUCTURE;
545 p_vpar->picture.b_top_field_first = 0;
546 p_vpar->picture.b_frame_pred_frame_dct = 1;
547 p_vpar->picture.b_concealment_mv = 0;
548 p_vpar->picture.b_q_scale_type = 0;
549 p_vpar->picture.b_intra_vlc_format = 0;
550 p_vpar->picture.b_alternate_scan = 0; /* zigzag */
551 p_vpar->picture.b_repeat_first_field = 0;
552 p_vpar->picture.b_progressive = 1;
556 p_vpar->pc_pictures[p_vpar->picture.i_coding_type]++;
559 if( p_vpar->picture.i_current_structure &&
560 (i_structure == FRAME_STRUCTURE ||
561 i_structure == p_vpar->picture.i_current_structure) )
563 /* We don't have the second field of the buffered frame. */
564 if( p_vpar->picture.p_picture != NULL )
566 ReferenceReplace( p_vpar,
567 p_vpar->picture.i_coding_type,
571 for( i_mb = 0; p_vpar->picture.pp_mb[i_mb] != NULL; i_mb++ )
573 vpar_DestroyMacroblock( &p_vpar->vfifo,
574 p_vpar->picture.pp_mb[i_mb] );
577 vout_DestroyPicture( p_vpar->p_vout, p_vpar->picture.p_picture );
580 p_vpar->picture.i_current_structure = 0;
582 intf_WarnMsg( 2, "Odd number of field pictures." );
585 /* Do we have the reference pictures ? */
586 b_parsable = !(((p_vpar->picture.i_coding_type == P_CODING_TYPE) &&
587 (p_vpar->sequence.p_backward == NULL)) ||
588 /* p_backward will become p_forward later */
589 ((p_vpar->picture.i_coding_type == B_CODING_TYPE) &&
590 (p_vpar->sequence.p_forward == NULL ||
591 p_vpar->sequence.p_backward == NULL)));
593 if( p_vpar->picture.i_current_structure )
595 /* Second field of a frame. We will decode it if, and only if we
596 * have decoded the first field. */
599 b_parsable = (p_vpar->picture.p_picture != NULL);
606 /* Compute the number of times the frame will be emitted by the
607 * decoder (number of half-periods). */
608 if( p_vpar->sequence.b_progressive )
610 i_repeat_field = (1 + p_vpar->picture.b_repeat_first_field
611 + p_vpar->picture.b_top_field_first) * 2;
615 if( p_vpar->picture.b_progressive )
617 i_repeat_field = 2 + p_vpar->picture.b_repeat_first_field;
625 /* Warn synchro we have a new picture (updates pictures index). */
626 vpar_SynchroNewPicture( p_vpar, p_vpar->picture.i_coding_type,
631 /* Does synchro say we have enough time to decode it ? */
632 b_parsable = vpar_SynchroChoose( p_vpar,
633 p_vpar->picture.i_coding_type, i_structure );
639 /* Update the reference pointers. */
640 ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, NULL );
642 /* Update context. */
643 if( i_structure != FRAME_STRUCTURE )
645 if( (p_vpar->picture.i_current_structure | i_structure)
648 p_vpar->picture.i_current_structure = 0;
652 /* The frame is complete. */
653 p_vpar->picture.i_current_structure = i_structure;
655 vpar_SynchroTrash( p_vpar, p_vpar->picture.i_coding_type, i_structure );
660 /* Warn Synchro we have trashed a picture. */
661 vpar_SynchroTrash( p_vpar, p_vpar->picture.i_coding_type, i_structure );
663 p_vpar->picture.p_picture = NULL;
668 /* OK, now we are sure we will decode the picture. */
670 p_vpar->pc_decoded_pictures[p_vpar->picture.i_coding_type]++;
673 #define P_picture p_vpar->picture.p_picture
674 p_vpar->picture.b_error = 0;
675 p_vpar->picture.b_frame_structure = (i_structure == FRAME_STRUCTURE);
677 if( !p_vpar->picture.i_current_structure )
679 /* This is a new frame. Get a structure from the video_output. */
680 while( ( P_picture = vout_CreatePicture( p_vpar->p_vout,
681 99+p_vpar->sequence.i_chroma_format, /*XXX??*/
682 p_vpar->sequence.i_width,
683 p_vpar->sequence.i_height ) )
686 intf_DbgMsg("vpar debug: allocation error in vout_CreatePicture, delaying");
687 if( p_vpar->p_fifo->b_die || p_vpar->p_fifo->b_error )
691 msleep( VPAR_OUTMEM_SLEEP );
694 /* Initialize values. */
695 vpar_SynchroDecode( p_vpar, p_vpar->picture.i_coding_type, i_structure );
696 P_picture->i_aspect_ratio = p_vpar->sequence.i_aspect_ratio;
697 P_picture->i_matrix_coefficients = p_vpar->sequence.i_matrix_coefficients;
698 p_vpar->picture.i_l_stride = ( p_vpar->sequence.i_width
699 << ( 1 - p_vpar->picture.b_frame_structure ) );
700 p_vpar->picture.i_c_stride = ( p_vpar->sequence.i_chroma_width
701 << ( 1 - p_vpar->picture.b_frame_structure ));
703 P_picture->i_deccount = p_vpar->sequence.i_mb_size;
705 memset( p_vpar->picture.pp_mb, 0, MAX_MB*sizeof(macroblock_t *) );
707 /* FIXME ! remove asap ?? */
708 //memset( P_picture->p_data, 0, (p_vpar->sequence.i_mb_size*384));
710 /* Update the reference pointers. */
711 ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, P_picture );
714 /* Link referenced pictures for the decoder
715 * They are unlinked in vpar_ReleaseMacroblock() & vpar_DestroyMacroblock() */
716 if( p_vpar->picture.i_coding_type == P_CODING_TYPE ||
717 p_vpar->picture.i_coding_type == B_CODING_TYPE )
719 vout_LinkPicture( p_vpar->p_vout, p_vpar->sequence.p_forward );
721 if( p_vpar->picture.i_coding_type == B_CODING_TYPE )
723 vout_LinkPicture( p_vpar->p_vout, p_vpar->sequence.p_backward );
727 p_vpar->picture.i_current_structure |= i_structure;
728 p_vpar->picture.i_structure = i_structure;
730 /* Initialize picture data for decoding. */
731 if( i_structure == BOTTOM_FIELD )
733 i_mb_base = p_vpar->sequence.i_mb_size >> 1;
734 p_vpar->mb.i_l_y = 1;
735 p_vpar->mb.i_c_y = 1;
740 p_vpar->mb.i_l_y = p_vpar->mb.i_c_y = 0;
742 p_vpar->mb.i_l_x = p_vpar->mb.i_c_x = 0;
744 /* Extension and User data. */
745 ExtensionAndUserData( p_vpar );
747 /* This is an MP@ML decoder, please note that neither of the following
748 * assertions can be true :
749 * p_vpar->sequence.i_chroma_format != CHROMA_420
750 * p_vpar->sequence.i_height > 2800
751 * p_vpar->sequence.i_scalable_mode == SC_DP
752 * Be cautious if you try to use the decoder for other profiles and
755 if( p_vpar->sequence.b_mpeg2 )
757 static f_picture_data_t ppf_picture_data[4][4] =
760 NULL, NULL, NULL, NULL
764 #if (VPAR_OPTIM_LEVEL > 1)
765 NULL, vpar_PictureData2IT, vpar_PictureData2PT,
768 NULL, vpar_PictureDataGENERIC, vpar_PictureDataGENERIC,
769 vpar_PictureDataGENERIC
774 #if (VPAR_OPTIM_LEVEL > 1)
775 NULL, vpar_PictureData2IB, vpar_PictureData2PB,
778 NULL, vpar_PictureDataGENERIC, vpar_PictureDataGENERIC,
779 vpar_PictureDataGENERIC
784 #if (VPAR_OPTIM_LEVEL > 0)
785 NULL, vpar_PictureData2IF, vpar_PictureData2PF,
788 NULL, vpar_PictureDataGENERIC, vpar_PictureDataGENERIC,
789 vpar_PictureDataGENERIC
794 ppf_picture_data[p_vpar->picture.i_structure]
795 [p_vpar->picture.i_coding_type]( p_vpar, i_mb_base );
799 #if (VPAR_OPTIM_LEVEL > 0)
800 static f_picture_data_t pf_picture_data[5] =
801 { NULL, vpar_PictureData1I, vpar_PictureData1P, vpar_PictureData1B,
802 vpar_PictureData1D };
804 pf_picture_data[p_vpar->picture.i_coding_type]( p_vpar, i_mb_base );
806 vpar_PictureDataGENERIC( p_vpar, i_mb_base );
810 if( p_vpar->p_fifo->b_die || p_vpar->p_fifo->b_error )
815 if( p_vpar->picture.b_error )
819 for( i_mb = 1; p_vpar->picture.pp_mb[i_mb] != NULL; i_mb++ )
821 vpar_DestroyMacroblock( &p_vpar->vfifo, p_vpar->picture.pp_mb[i_mb] );
826 p_vpar->pc_malformed_pictures[p_vpar->picture.i_coding_type]++;
829 if( P_picture->i_deccount != 1 )
831 vpar_SynchroEnd( p_vpar, 1 );
832 vout_DestroyPicture( p_vpar->p_vout, P_picture );
835 ReferenceReplace( p_vpar, p_vpar->picture.i_coding_type, NULL );
837 /* Prepare context for the next picture. */
839 if( p_vpar->picture.i_current_structure == FRAME_STRUCTURE )
840 p_vpar->picture.i_current_structure = 0;
842 else if( p_vpar->picture.i_current_structure == FRAME_STRUCTURE )
844 /* Frame completely parsed. */
846 for( i_mb = 1; p_vpar->picture.pp_mb[i_mb] != NULL; i_mb++ )
848 vpar_DecodeMacroblock( &p_vpar->vfifo, p_vpar->picture.pp_mb[i_mb] );
851 /* Send signal to the video_decoder. */
852 vlc_mutex_lock( &p_vpar->vfifo.lock );
853 vlc_cond_signal( &p_vpar->vfifo.wait );
854 vlc_mutex_unlock( &p_vpar->vfifo.lock );
857 /* Prepare context for the next picture. */
859 p_vpar->picture.i_current_structure = 0;
864 /*****************************************************************************
865 * ExtensionAndUserData : Parse the extension_and_user_data structure
866 *****************************************************************************/
867 static void ExtensionAndUserData( vpar_thread_t * p_vpar )
869 while( !p_vpar->p_fifo->b_die )
871 NextStartCode( &p_vpar->bit_stream );
872 switch( ShowBits( &p_vpar->bit_stream, 32 ) )
874 case EXTENSION_START_CODE:
875 RemoveBits32( &p_vpar->bit_stream );
876 switch( GetBits( &p_vpar->bit_stream, 4 ) )
878 case SEQUENCE_DISPLAY_EXTENSION_ID:
879 SequenceDisplayExtension( p_vpar );
881 case QUANT_MATRIX_EXTENSION_ID:
882 QuantMatrixExtension( p_vpar );
884 case SEQUENCE_SCALABLE_EXTENSION_ID:
885 SequenceScalableExtension( p_vpar );
887 case PICTURE_DISPLAY_EXTENSION_ID:
888 PictureDisplayExtension( p_vpar );
890 case PICTURE_SPATIAL_SCALABLE_EXTENSION_ID:
891 PictureSpatialScalableExtension( p_vpar );
893 case PICTURE_TEMPORAL_SCALABLE_EXTENSION_ID:
894 PictureTemporalScalableExtension( p_vpar );
896 case COPYRIGHT_EXTENSION_ID:
897 CopyrightExtension( p_vpar );
903 case USER_DATA_START_CODE:
904 RemoveBits32( &p_vpar->bit_stream );
905 /* Wait for the next start code */
915 /*****************************************************************************
916 * SequenceDisplayExtension : Parse the sequence_display_extension structure *
917 *****************************************************************************/
919 static void SequenceDisplayExtension( vpar_thread_t * p_vpar )
921 /* We don't care sequence_display_extension. */
923 RemoveBits( &p_vpar->bit_stream, 3 );
924 if( GetBits( &p_vpar->bit_stream, 1 ) )
926 /* Two bytes for color_desciption */
927 RemoveBits( &p_vpar->bit_stream, 16 );
928 p_vpar->sequence.i_matrix_coefficients = GetBits( &p_vpar->bit_stream, 8 );
930 /* display_horizontal and vertical_size and a marker_bit */
931 RemoveBits( &p_vpar->bit_stream, 29 );
935 /*****************************************************************************
936 * QuantMatrixExtension : Load quantization matrices for luminance *
938 *****************************************************************************/
940 static void QuantMatrixExtension( vpar_thread_t * p_vpar )
942 if( GetBits( &p_vpar->bit_stream, 1 ) )
944 /* Load intra_quantiser_matrix for luminance. */
945 LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
949 /* Use the default matrix. */
950 LinkMatrix( &p_vpar->sequence.intra_quant,
951 p_vpar->pi_default_intra_quant );
953 if( GetBits( &p_vpar->bit_stream, 1 ) )
955 /* Load non_intra_quantiser_matrix for luminance. */
956 LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
960 /* Use the default matrix. */
961 LinkMatrix( &p_vpar->sequence.nonintra_quant,
962 p_vpar->pi_default_nonintra_quant );
964 if( GetBits( &p_vpar->bit_stream, 1 ) )
966 /* Load intra_quantiser_matrix for chrominance. */
967 LoadMatrix( p_vpar, &p_vpar->sequence.chroma_intra_quant );
971 /* Link the chrominance intra matrix to the luminance one. */
972 LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
973 p_vpar->sequence.intra_quant.pi_matrix );
975 if( GetBits( &p_vpar->bit_stream, 1 ) )
977 /* Load non_intra_quantiser_matrix for chrominance. */
978 LoadMatrix( p_vpar, &p_vpar->sequence.chroma_nonintra_quant );
982 /* Link the chrominance intra matrix to the luminance one. */
983 LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
984 p_vpar->sequence.intra_quant.pi_matrix );
986 if( GetBits( &p_vpar->bit_stream, 1 ) )
988 /* Load non_intra_quantiser_matrix for chrominance. */
989 LoadMatrix( p_vpar, &p_vpar->sequence.chroma_nonintra_quant );
993 /* Link the chrominance nonintra matrix to the luminance one. */
994 LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
995 p_vpar->sequence.nonintra_quant.pi_matrix );
1000 /*****************************************************************************
1001 * SequenceScalableExtension : Parse the sequence_scalable_extension *
1002 * structure to handle scalable coding *
1003 *****************************************************************************/
1005 static void SequenceScalableExtension( vpar_thread_t * p_vpar )
1007 /* We don't care about anything scalable except the scalable mode. */
1008 switch( p_vpar->sequence.i_scalable_mode = GetBits( &p_vpar->bit_stream, 2 ) )
1009 /* The length of the structure depends on the value of the scalable_mode */
1012 RemoveBits32( &p_vpar->bit_stream );
1013 RemoveBits( &p_vpar->bit_stream, 21 );
1016 RemoveBits( &p_vpar->bit_stream, 12 );
1019 RemoveBits( &p_vpar->bit_stream, 4 );
1023 /*****************************************************************************
1024 * PictureDisplayExtension : Parse the picture_display_extension structure *
1025 *****************************************************************************/
1027 static void PictureDisplayExtension( vpar_thread_t * p_vpar )
1029 /* Number of frame center offset */
1031 /* I am not sure it works but it should
1032 (fewer tests than shown in §6.3.12) */
1033 i_nb = p_vpar->sequence.b_progressive ? p_vpar->sequence.b_progressive +
1034 p_vpar->picture.b_repeat_first_field +
1035 p_vpar->picture.b_top_field_first
1036 : ( p_vpar->picture.b_frame_structure + 1 ) +
1037 p_vpar->picture.b_repeat_first_field;
1038 for( i_dummy = 0; i_dummy < i_nb; i_dummy++ )
1040 RemoveBits( &p_vpar->bit_stream, 17 );
1041 RemoveBits( &p_vpar->bit_stream, 17 );
1046 /*****************************************************************************
1047 * PictureSpatialScalableExtension *
1048 *****************************************************************************/
1050 static void PictureSpatialScalableExtension( vpar_thread_t * p_vpar )
1052 /* That's scalable, so we trash it */
1053 RemoveBits32( &p_vpar->bit_stream );
1054 RemoveBits( &p_vpar->bit_stream, 16 );
1058 /*****************************************************************************
1059 * PictureTemporalScalableExtension *
1060 *****************************************************************************/
1062 static void PictureTemporalScalableExtension( vpar_thread_t * p_vpar )
1064 /* Scalable again, trashed again */
1065 RemoveBits( &p_vpar->bit_stream, 23 );
1069 /*****************************************************************************
1070 * CopyrightExtension : Keeps some legal informations *
1071 *****************************************************************************/
1073 static void CopyrightExtension( vpar_thread_t * p_vpar )
1075 u32 i_copyright_nb_1, i_copyright_nb_2; /* local integers */
1076 p_vpar->sequence.b_copyright_flag = GetBits( &p_vpar->bit_stream, 1 );
1077 /* A flag that says whether the copyright information is significant */
1078 p_vpar->sequence.i_copyright_id = GetBits( &p_vpar->bit_stream, 8 );
1079 /* An identifier compliant with ISO/CEI JTC 1/SC 29 */
1080 p_vpar->sequence.b_original = GetBits( &p_vpar->bit_stream, 1 );
1082 RemoveBits( &p_vpar->bit_stream, 8 );
1083 /* The copyright_number is split in three parts */
1085 i_copyright_nb_1 = GetBits( &p_vpar->bit_stream, 20 );
1086 RemoveBits( &p_vpar->bit_stream, 1 );
1088 i_copyright_nb_2 = GetBits( &p_vpar->bit_stream, 22 );
1089 RemoveBits( &p_vpar->bit_stream, 1 );
1090 /* third part and sum */
1091 p_vpar->sequence.i_copyright_nb = ( (u64)i_copyright_nb_1 << 44 ) |
1092 ( (u64)i_copyright_nb_2 << 22 ) |
1093 ( (u64)GetBits( &p_vpar->bit_stream, 22 ) );