1 /*****************************************************************************
2 * vpar_headers.c : headers parsing
3 *****************************************************************************
4 * Copyright (C) 1999-2001 VideoLAN
5 * $Id: headers.c,v 1.6 2002/11/28 17:35:00 sam 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 *****************************************************************************/
28 #include <stdlib.h> /* free() */
29 #include <string.h> /* memcpy(), memset() */
33 #include <vlc/decoder.h>
43 static inline void NextStartCode( bit_stream_t * );
44 static void SequenceHeader( vpar_thread_t * p_vpar );
45 static void GroupHeader( vpar_thread_t * p_vpar );
46 static void PictureHeader( vpar_thread_t * p_vpar );
47 static void ExtensionAndUserData( vpar_thread_t * p_vpar );
48 static void QuantMatrixExtension( vpar_thread_t * p_vpar );
49 static void SequenceScalableExtension( vpar_thread_t * p_vpar );
50 static void SequenceDisplayExtension( vpar_thread_t * p_vpar );
51 static void PictureDisplayExtension( vpar_thread_t * p_vpar );
52 static void PictureSpatialScalableExtension( vpar_thread_t * p_vpar );
53 static void PictureTemporalScalableExtension( vpar_thread_t * p_vpar );
54 static void CopyrightExtension( vpar_thread_t * p_vpar );
60 /*****************************************************************************
61 * pi_default_intra_quant : default quantization matrix
62 *****************************************************************************/
63 u8 pi_default_intra_quant[] ATTR_ALIGN(16) =
65 8, 16, 19, 22, 26, 27, 29, 34,
66 16, 16, 22, 24, 27, 29, 34, 37,
67 19, 22, 26, 27, 29, 34, 34, 38,
68 22, 22, 26, 27, 29, 34, 37, 40,
69 22, 26, 27, 29, 32, 35, 40, 48,
70 26, 27, 29, 32, 35, 40, 48, 58,
71 26, 27, 29, 34, 38, 46, 56, 69,
72 27, 29, 35, 38, 46, 56, 69, 83
75 /*****************************************************************************
76 * pi_default_nonintra_quant : default quantization matrix
77 *****************************************************************************/
78 u8 pi_default_nonintra_quant[] ATTR_ALIGN(16) =
80 16, 16, 16, 16, 16, 16, 16, 16,
81 16, 16, 16, 16, 16, 16, 16, 16,
82 16, 16, 16, 16, 16, 16, 16, 16,
83 16, 16, 16, 16, 16, 16, 16, 16,
84 16, 16, 16, 16, 16, 16, 16, 16,
85 16, 16, 16, 16, 16, 16, 16, 16,
86 16, 16, 16, 16, 16, 16, 16, 16,
87 16, 16, 16, 16, 16, 16, 16, 16
90 /*****************************************************************************
91 * pi_scan : zig-zag and alternate scan patterns
92 *****************************************************************************/
93 u8 pi_scan[2][64] ATTR_ALIGN(16) =
95 { /* Zig-Zag pattern */
96 0,1,8,16,9,2,3,10,17,24,32,25,18,11,4,5,
97 12,19,26,33,40,48,41,34,27,20,13,6,7,14,21,28,
98 35,42,49,56,57,50,43,36,29,22,15,23,30,37,44,51,
99 58,59,52,45,38,31,39,46,53,60,61,54,47,55,62,63
101 { /* Alternate scan pattern */
102 0,8,16,24,1,9,2,10,17,25,32,40,48,56,57,49,
103 41,33,26,18,3,11,4,12,19,27,34,42,50,58,35,43,
104 51,59,20,28,5,13,6,14,21,29,36,44,52,60,37,45,
105 53,61,22,30,7,15,23,31,38,46,54,62,39,47,55,63
110 * Local inline functions.
113 /*****************************************************************************
114 * ReferenceUpdate : Update the reference pointers when we have a new picture
115 *****************************************************************************/
116 static void inline ReferenceUpdate( vpar_thread_t * p_vpar,
117 int i_coding_type, picture_t * p_newref )
119 if( i_coding_type != B_CODING_TYPE )
121 if( p_vpar->sequence.p_forward != NULL )
123 vout_UnlinkPicture( p_vpar->p_vout, p_vpar->sequence.p_forward );
125 if( p_vpar->sequence.p_backward != NULL )
127 vout_DatePicture( p_vpar->p_vout, p_vpar->sequence.p_backward,
128 vpar_SynchroDate( p_vpar ) );
130 p_vpar->sequence.p_forward = p_vpar->sequence.p_backward;
131 p_vpar->sequence.p_backward = p_newref;
132 if( p_newref != NULL )
134 vout_LinkPicture( p_vpar->p_vout, p_newref );
137 else if( p_newref != NULL )
139 /* Put date immediately. */
140 vout_DatePicture( p_vpar->p_vout, p_newref, vpar_SynchroDate(p_vpar) );
144 /*****************************************************************************
145 * ReferenceReplace : Replace the last reference pointer when we destroy
147 *****************************************************************************/
148 static void inline ReferenceReplace( vpar_thread_t * p_vpar,
149 int i_coding_type, picture_t * p_newref )
151 if( i_coding_type != B_CODING_TYPE )
153 if( p_vpar->sequence.p_backward != NULL )
155 vout_UnlinkPicture( p_vpar->p_vout, p_vpar->sequence.p_backward );
157 p_vpar->sequence.p_backward = p_newref;
158 if( p_newref != NULL )
160 vout_LinkPicture( p_vpar->p_vout, p_newref );
165 /*****************************************************************************
166 * LoadMatrix : Load a quantization matrix
167 *****************************************************************************/
168 static inline void LoadMatrix( vpar_thread_t * p_vpar,
169 quant_matrix_t * p_matrix )
173 if( !p_matrix->b_allocated )
175 /* Allocate a piece of memory to load the matrix. */
176 if( (p_matrix->pi_matrix = (u8 *)malloc( 64*sizeof(u8) )) == NULL )
178 msg_Err( p_vpar->p_fifo, "out of memory" );
179 p_vpar->p_fifo->b_error = 1;
182 p_matrix->b_allocated = 1;
185 for( i_dummy = 0; i_dummy < 64; i_dummy++ )
187 p_matrix->pi_matrix[p_vpar->ppi_scan[0][i_dummy]]
188 = GetBits( &p_vpar->bit_stream, 8 );
192 /*****************************************************************************
193 * LinkMatrix : Link a quantization matrix to another
194 *****************************************************************************/
195 static inline void LinkMatrix( quant_matrix_t * p_matrix, u8 * pi_array )
197 if( p_matrix->b_allocated )
199 /* Deallocate the piece of memory. */
200 free( p_matrix->pi_matrix );
201 p_matrix->b_allocated = 0;
204 p_matrix->pi_matrix = pi_array;
207 /*****************************************************************************
208 * ChromaToFourCC: Return a FourCC value used by the video output.
209 *****************************************************************************/
210 static inline vlc_fourcc_t ChromaToFourCC( int i_chroma )
215 return VLC_FOURCC('I','4','2','0');
218 return VLC_FOURCC('I','4','2','2');
221 return VLC_FOURCC('I','4','4','4');
224 /* This can't happen */
230 * Exported functions.
233 /*****************************************************************************
234 * vpar_NextSequenceHeader : Find the next sequence header
235 *****************************************************************************/
236 int vpar_NextSequenceHeader( vpar_thread_t * p_vpar )
238 while( !p_vpar->p_fifo->b_die )
240 NextStartCode( &p_vpar->bit_stream );
241 if( ShowBits( &p_vpar->bit_stream, 32 ) == SEQUENCE_HEADER_CODE )
245 RemoveBits( &p_vpar->bit_stream, 8 );
250 /*****************************************************************************
251 * vpar_ParseHeader : Parse the next header
252 *****************************************************************************/
253 int vpar_ParseHeader( vpar_thread_t * p_vpar )
255 NextStartCode( &p_vpar->bit_stream );
256 switch( GetBits32( &p_vpar->bit_stream ) )
258 case SEQUENCE_HEADER_CODE:
259 p_vpar->c_sequences++;
260 SequenceHeader( p_vpar );
263 case GROUP_START_CODE:
264 GroupHeader( p_vpar );
267 case PICTURE_START_CODE:
268 PictureHeader( p_vpar );
271 case SEQUENCE_END_CODE:
272 msg_Dbg( p_vpar->p_fifo, "sequence end code received" );
273 if( p_vpar->sequence.p_backward != NULL )
275 p_vpar->sequence.p_backward->b_force = 1;
277 ReferenceUpdate( p_vpar, I_CODING_TYPE, NULL );
288 * Following functions are local
291 /*****************************************************************************
292 * SequenceHeader : Parse the next sequence header
293 *****************************************************************************/
294 static void SequenceHeader( vpar_thread_t * p_vpar )
297 static int i_frame_rate_table[16] =
308 RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED, RESERVED
314 p_vpar->sequence.i_width = GetBits( &p_vpar->bit_stream, 12 );
315 p_vpar->sequence.i_height = GetBits( &p_vpar->bit_stream, 12 );
316 i_aspect = GetBits( &p_vpar->bit_stream, 4 );
317 p_vpar->sequence.i_frame_rate =
318 i_frame_rate_table[ GetBits( &p_vpar->bit_stream, 4 ) ];
320 /* We don't need bit_rate_value, marker_bit, vbv_buffer_size,
321 * constrained_parameters_flag */
322 RemoveBits( &p_vpar->bit_stream, 30 );
325 * Quantization matrices
327 if( GetBits( &p_vpar->bit_stream, 1 ) ) /* load_intra_quantizer_matrix */
329 LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
333 /* Use default matrix. */
334 LinkMatrix( &p_vpar->sequence.intra_quant,
335 p_vpar->pi_default_intra_quant );
338 if( GetBits(&p_vpar->bit_stream, 1) ) /* load_non_intra_quantizer_matrix */
340 LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
344 /* Use default matrix. */
345 LinkMatrix( &p_vpar->sequence.nonintra_quant,
346 p_vpar->pi_default_nonintra_quant );
349 /* Unless later overwritten by a matrix extension, we have the same
350 * matrices for luminance and chrominance. */
351 LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
352 p_vpar->sequence.intra_quant.pi_matrix );
353 LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
354 p_vpar->sequence.nonintra_quant.pi_matrix );
359 NextStartCode( &p_vpar->bit_stream );
360 if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
364 /* Turn the MPEG2 flag on */
365 p_vpar->sequence.b_mpeg2 = 1;
367 /* Parse sequence_extension */
368 RemoveBits32( &p_vpar->bit_stream );
369 /* extension_start_code_identifier, profile_and_level_indication */
370 RemoveBits( &p_vpar->bit_stream, 12 );
371 p_vpar->sequence.b_progressive = GetBits( &p_vpar->bit_stream, 1 );
372 p_vpar->sequence.i_chroma_format = GetBits( &p_vpar->bit_stream, 2 );
373 p_vpar->sequence.i_width |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
374 p_vpar->sequence.i_height |= GetBits( &p_vpar->bit_stream, 2 ) << 12;
375 /* bit_rate_extension, marker_bit, vbv_buffer_size_extension,
377 RemoveBits( &p_vpar->bit_stream, 22 );
378 /* frame_rate_extension_n */
379 i_dummy = GetBits( &p_vpar->bit_stream, 2 );
380 /* frame_rate_extension_d */
381 p_vpar->sequence.i_frame_rate *= (i_dummy + 1)
382 / (GetBits( &p_vpar->bit_stream, 5 ) + 1);
386 /* It's an MPEG-1 stream. Put adequate parameters. */
388 static int pi_mpeg1ratio[15] = {
389 10000, 10000, 6735, 7031, 7615, 8055, 8437, 8935,
390 9157, 9815, 10255, 10695, 10950, 11575, 12015
395 i_xyratio = p_vpar->sequence.i_height *
396 pi_mpeg1ratio[i_aspect] / p_vpar->sequence.i_width;
397 if( 7450 < i_xyratio && i_xyratio < 7550 )
401 else if( 5575 < i_xyratio && i_xyratio < 5675 )
405 else if( 4475 < i_xyratio && i_xyratio < 4575 )
411 p_vpar->sequence.b_mpeg2 = 0;
412 p_vpar->sequence.b_progressive = 1;
413 p_vpar->sequence.i_chroma_format = CHROMA_420;
416 /* check whether the input gives a particular aspect ratio */
417 if( p_vpar->p_fifo->p_demux_data
418 && ( *(int*)(p_vpar->p_fifo->p_demux_data) & 0x7 ) )
420 i_aspect = *(int*)(p_vpar->p_fifo->p_demux_data);
423 /* Store calculated aspect ratio */
427 p_vpar->sequence.i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
430 case AR_16_9_PICTURE:
431 p_vpar->sequence.i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
434 case AR_221_1_PICTURE:
435 p_vpar->sequence.i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
438 case AR_SQUARE_PICTURE:
440 p_vpar->sequence.i_aspect = VOUT_ASPECT_FACTOR
441 * p_vpar->sequence.i_width / p_vpar->sequence.i_height;
446 p_vpar->sequence.i_mb_width = (p_vpar->sequence.i_width + 15) / 16;
447 p_vpar->sequence.i_mb_height = (p_vpar->sequence.b_progressive) ?
448 (p_vpar->sequence.i_height + 15) / 16 :
449 2 * ((p_vpar->sequence.i_height + 31) / 32);
450 p_vpar->sequence.i_mb_size = p_vpar->sequence.i_mb_width
451 * p_vpar->sequence.i_mb_height;
452 p_vpar->sequence.i_width = (p_vpar->sequence.i_mb_width * 16);
453 p_vpar->sequence.i_height = (p_vpar->sequence.i_mb_height * 16);
454 p_vpar->sequence.i_size = p_vpar->sequence.i_width
455 * p_vpar->sequence.i_height;
456 switch( p_vpar->sequence.i_chroma_format )
459 p_vpar->sequence.i_chroma_nb_blocks = 2;
460 p_vpar->sequence.b_chroma_h_subsampled = 1;
461 p_vpar->sequence.b_chroma_v_subsampled = 1;
464 p_vpar->sequence.i_chroma_nb_blocks = 4;
465 p_vpar->sequence.b_chroma_h_subsampled = 1;
466 p_vpar->sequence.b_chroma_v_subsampled = 0;
469 p_vpar->sequence.i_chroma_nb_blocks = 6;
470 p_vpar->sequence.b_chroma_h_subsampled = 0;
471 p_vpar->sequence.b_chroma_v_subsampled = 0;
475 /* Extension and User data */
476 ExtensionAndUserData( p_vpar );
478 /* Spawn a video output if there is none. First we look for our children,
479 * then we look for any other vout that might be available. */
481 vout_Request( p_vpar->p_fifo, p_vpar->p_vout,
482 p_vpar->sequence.i_width, p_vpar->sequence.i_height,
483 ChromaToFourCC( p_vpar->sequence.i_chroma_format ),
484 p_vpar->sequence.i_aspect );
486 if( p_vpar->p_fifo->b_die || p_vpar->p_fifo->b_error )
491 if( p_vpar->p_vout == NULL )
493 msg_Err( p_vpar->p_fifo, "cannot open vout, aborting" );
494 p_vpar->p_fifo->b_error = 1;
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 int i_structure, i_previous_coding_type;
515 vlc_bool_t b_parsable = 0;
517 /* Retrieve the PTS. */
518 CurrentPTS( &p_vpar->bit_stream, &p_vpar->sequence.next_pts,
519 &p_vpar->sequence.next_dts );
521 /* Recover in case of stream discontinuity. */
522 if( p_vpar->sequence.b_expect_discontinuity )
524 ReferenceUpdate( p_vpar, I_CODING_TYPE, NULL );
525 ReferenceUpdate( p_vpar, I_CODING_TYPE, NULL );
526 if( p_vpar->picture.p_picture != NULL )
528 vout_DestroyPicture( p_vpar->p_vout, p_vpar->picture.p_picture );
529 p_vpar->picture.p_picture = NULL;
531 p_vpar->picture.i_current_structure = 0;
532 p_vpar->sequence.b_expect_discontinuity = 0;
535 /* Parse the picture header. */
536 RemoveBits( &p_vpar->bit_stream, 10 ); /* temporal_reference */
537 i_previous_coding_type = p_vpar->picture.i_coding_type;
538 p_vpar->picture.i_coding_type = GetBits( &p_vpar->bit_stream, 3 );
539 RemoveBits( &p_vpar->bit_stream, 16 ); /* vbv_delay */
541 if( p_vpar->picture.i_coding_type == P_CODING_TYPE
542 || p_vpar->picture.i_coding_type == B_CODING_TYPE )
544 p_vpar->picture.ppi_f_code[0][1] = GetBits( &p_vpar->bit_stream, 1 );
545 p_vpar->picture.ppi_f_code[0][0] = GetBits( &p_vpar->bit_stream, 3 )
548 if( p_vpar->picture.i_coding_type == B_CODING_TYPE )
550 p_vpar->picture.ppi_f_code[1][1] = GetBits( &p_vpar->bit_stream, 1 );
551 p_vpar->picture.ppi_f_code[1][0] = GetBits( &p_vpar->bit_stream, 3 )
555 /* extra_information_picture */
556 while( GetBits( &p_vpar->bit_stream, 1 ) )
558 RemoveBits( &p_vpar->bit_stream, 8 );
562 * Picture Coding Extension
564 NextStartCode( &p_vpar->bit_stream );
565 if( ShowBits( &p_vpar->bit_stream, 32 ) == EXTENSION_START_CODE )
567 /* Parse picture_coding_extension */
568 RemoveBits32( &p_vpar->bit_stream );
569 /* extension_start_code_identifier */
570 RemoveBits( &p_vpar->bit_stream, 4 );
572 /* Pre-substract 1 for later use in MotionDelta(). */
573 p_vpar->picture.ppi_f_code[0][0] = GetBits( &p_vpar->bit_stream, 4 ) -1;
574 p_vpar->picture.ppi_f_code[0][1] = GetBits( &p_vpar->bit_stream, 4 ) -1;
575 p_vpar->picture.ppi_f_code[1][0] = GetBits( &p_vpar->bit_stream, 4 ) -1;
576 p_vpar->picture.ppi_f_code[1][1] = GetBits( &p_vpar->bit_stream, 4 ) -1;
577 p_vpar->picture.i_intra_dc_precision = GetBits( &p_vpar->bit_stream, 2 );
578 i_structure = GetBits( &p_vpar->bit_stream, 2 );
579 p_vpar->picture.b_top_field_first = GetBits( &p_vpar->bit_stream, 1 );
580 p_vpar->picture.b_frame_pred_frame_dct
581 = GetBits( &p_vpar->bit_stream, 1 );
582 p_vpar->picture.b_concealment_mv = GetBits( &p_vpar->bit_stream, 1 );
583 p_vpar->picture.b_q_scale_type = GetBits( &p_vpar->bit_stream, 1 );
584 p_vpar->picture.b_intra_vlc_format = GetBits( &p_vpar->bit_stream, 1 );
586 p_vpar->picture.pi_scan =
587 p_vpar->ppi_scan[ GetBits( &p_vpar->bit_stream, 1 ) ];
588 p_vpar->picture.b_repeat_first_field = GetBits( &p_vpar->bit_stream, 1 );
589 /* chroma_420_type (obsolete) */
590 RemoveBits( &p_vpar->bit_stream, 1 );
591 p_vpar->picture.b_progressive = GetBits( &p_vpar->bit_stream, 1 );
593 /* composite_display_flag */
594 if( GetBits( &p_vpar->bit_stream, 1 ) )
596 /* v_axis, field_sequence, sub_carrier, burst_amplitude,
597 * sub_carrier_phase */
598 RemoveBits( &p_vpar->bit_stream, 20 );
603 /* MPEG-1 compatibility flags */
604 p_vpar->picture.i_intra_dc_precision = 0; /* 8 bits */
605 i_structure = FRAME_STRUCTURE;
606 p_vpar->picture.b_top_field_first = 0;
607 p_vpar->picture.b_frame_pred_frame_dct = 1;
608 p_vpar->picture.b_concealment_mv = 0;
609 p_vpar->picture.b_q_scale_type = 0;
610 p_vpar->picture.b_intra_vlc_format = 0;
611 p_vpar->picture.pi_scan = p_vpar->ppi_scan[0];
612 p_vpar->picture.b_repeat_first_field = 0;
613 p_vpar->picture.b_progressive = 1;
616 /* Extension and User data. */
617 ExtensionAndUserData( p_vpar );
619 p_vpar->pc_pictures[p_vpar->picture.i_coding_type]++;
621 if( p_vpar->picture.i_current_structure )
623 if ( (i_structure == FRAME_STRUCTURE ||
624 i_structure == p_vpar->picture.i_current_structure) )
626 /* We don't have the second field of the buffered frame. */
627 if( p_vpar->picture.p_picture != NULL )
629 ReferenceReplace( p_vpar,
630 p_vpar->picture.i_coding_type,
632 vout_DestroyPicture( p_vpar->p_vout,
633 p_vpar->picture.p_picture );
634 p_vpar->picture.p_picture = NULL;
637 p_vpar->picture.i_current_structure = 0;
639 msg_Warn( p_vpar->p_fifo, "odd number of field pictures" );
643 /* Second field of a frame. We will decode it if, and only if we
644 * have decoded the first field. */
645 if( p_vpar->picture.p_picture == NULL )
647 if( (p_vpar->picture.i_coding_type == I_CODING_TYPE
648 && p_vpar->sequence.p_backward == NULL) )
650 /* Exceptionnally, parse the picture if it is I. We need
651 * this in case of an odd number of field pictures, if the
652 * previous picture is not intra, we desperately need a
653 * new reference picture. OK, this is kind of kludgy. */
654 p_vpar->picture.i_current_structure = 0;
663 /* We suppose we have the reference pictures, since we already
664 * decoded the first field and the second field will not need
665 * any extra reference picture. There is a special case of
666 * P field being the second field of an I field, but ISO/IEC
667 * 13818-2 section 7.6.3.5 specifies that this P field will
668 * not need any reference picture besides the I field. So far
672 if( p_vpar->picture.i_coding_type == P_CODING_TYPE &&
673 i_previous_coding_type == I_CODING_TYPE &&
674 p_vpar->sequence.p_forward == NULL )
676 /* This is the special case of section 7.6.3.5. Create
677 * a fake reference picture (which will not be used)
678 * but will prevent us from segfaulting in the slice
680 static picture_t fake_picture;
681 fake_picture.i_planes = 0; /* We will use it later */
682 p_vpar->sequence.p_forward = &fake_picture;
688 if( !p_vpar->picture.i_current_structure )
690 /* First field of a frame, or new frame picture. */
693 /* Do we have the reference pictures ? */
694 b_parsable = !(((p_vpar->picture.i_coding_type == P_CODING_TYPE ||
695 p_vpar->picture.b_concealment_mv) &&
696 (p_vpar->sequence.p_backward == NULL)) ||
697 /* p_backward will become p_forward later */
698 ((p_vpar->picture.i_coding_type == B_CODING_TYPE) &&
699 (p_vpar->sequence.p_forward == NULL ||
700 p_vpar->sequence.p_backward == NULL)));
702 /* Compute the number of times the frame will be emitted by the
703 * decoder (number of half-periods). */
704 if( p_vpar->sequence.b_progressive )
706 i_repeat_field = (1 + p_vpar->picture.b_repeat_first_field
707 + p_vpar->picture.b_top_field_first) * 2;
711 if( p_vpar->picture.b_progressive )
713 i_repeat_field = 2 + p_vpar->picture.b_repeat_first_field;
721 /* Warn synchro we have a new picture (updates pictures index). */
722 vpar_SynchroNewPicture( p_vpar, p_vpar->picture.i_coding_type,
727 /* Does synchro say we have enough time to decode it ? */
728 b_parsable = vpar_SynchroChoose( p_vpar,
729 p_vpar->picture.i_coding_type, i_structure );
735 /* Update the reference pointers. */
736 ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, NULL );
738 /* Update context. */
739 if( i_structure != FRAME_STRUCTURE )
741 if( (p_vpar->picture.i_current_structure | i_structure)
744 /* The frame is complete. */
745 p_vpar->picture.i_current_structure = 0;
747 vpar_SynchroTrash( p_vpar, p_vpar->picture.i_coding_type, i_structure );
751 p_vpar->picture.i_current_structure = i_structure;
756 /* Warn Synchro we have trashed a picture. */
757 vpar_SynchroTrash( p_vpar, p_vpar->picture.i_coding_type, i_structure );
759 p_vpar->picture.p_picture = NULL;
764 /* OK, now we are sure we will decode the picture. */
765 p_vpar->pc_decoded_pictures[p_vpar->picture.i_coding_type]++;
767 #define P_picture p_vpar->picture.p_picture
768 p_vpar->picture.b_error = 0;
769 p_vpar->picture.b_frame_structure = (i_structure == FRAME_STRUCTURE);
771 if( !p_vpar->picture.i_current_structure )
773 /* This is a new frame. Get a structure from the video_output. */
774 while( ( P_picture = vout_CreatePicture( p_vpar->p_vout,
775 p_vpar->picture.b_progressive,
776 p_vpar->picture.b_top_field_first,
777 p_vpar->picture.b_repeat_first_field ) )
780 if( p_vpar->p_fifo->b_die || p_vpar->p_fifo->b_error )
784 msleep( VOUT_OUTMEM_SLEEP );
787 /* Initialize values. */
788 vpar_SynchroDecode( p_vpar, p_vpar->picture.i_coding_type, i_structure );
789 P_picture->i_matrix_coefficients = p_vpar->sequence.i_matrix_coefficients;
791 /* Update the reference pointers. */
792 ReferenceUpdate( p_vpar, p_vpar->picture.i_coding_type, P_picture );
795 /* Initialize picture data for decoding. */
796 p_vpar->picture.i_current_structure |= i_structure;
797 p_vpar->picture.i_structure = i_structure;
798 p_vpar->picture.b_second_field =
799 (i_structure != p_vpar->picture.i_current_structure);
800 p_vpar->picture.b_current_field =
801 (i_structure == BOTTOM_FIELD );
802 p_vpar->picture.i_lum_stride = p_vpar->picture.p_picture->Y_PITCH
803 << ( 1 - p_vpar->picture.b_frame_structure );
804 p_vpar->picture.i_chrom_stride = p_vpar->picture.p_picture->U_PITCH
805 << ( 1 - p_vpar->picture.b_frame_structure );
806 /* We suppose the pitch is the same for U and V planes. */
807 p_vpar->picture.i_field_width = p_vpar->sequence.i_width
808 << ( 1 - p_vpar->picture.b_frame_structure );
810 if( !p_vpar->p_fifo->p_stream_ctrl->b_grayscale )
812 switch( p_vpar->sequence.i_chroma_format )
815 p_vpar->pool.pf_vdec_decode = vdec_DecodeMacroblock422;
818 p_vpar->pool.pf_vdec_decode = vdec_DecodeMacroblock444;
822 p_vpar->pool.pf_vdec_decode = vdec_DecodeMacroblock420;
828 p_vpar->pool.pf_vdec_decode = vdec_DecodeMacroblockBW;
832 if( p_vpar->sequence.b_mpeg2 )
834 static f_picture_data_t ppf_picture_data[4][4] =
837 NULL, NULL, NULL, NULL
841 #if (VPAR_OPTIM_LEVEL > 1)
842 NULL, vpar_PictureData2IT, vpar_PictureData2PT,
845 NULL, vpar_PictureDataGENERIC, vpar_PictureDataGENERIC,
846 vpar_PictureDataGENERIC
851 #if (VPAR_OPTIM_LEVEL > 1)
852 NULL, vpar_PictureData2IB, vpar_PictureData2PB,
855 NULL, vpar_PictureDataGENERIC, vpar_PictureDataGENERIC,
856 vpar_PictureDataGENERIC
861 #if (VPAR_OPTIM_LEVEL > 0)
862 NULL, vpar_PictureData2IF, vpar_PictureData2PF,
865 NULL, vpar_PictureDataGENERIC, vpar_PictureDataGENERIC,
866 vpar_PictureDataGENERIC
871 ppf_picture_data[p_vpar->picture.i_structure]
872 [p_vpar->picture.i_coding_type]( p_vpar );
876 #if (VPAR_OPTIM_LEVEL > 1)
877 static f_picture_data_t pf_picture_data[5] =
878 { NULL, vpar_PictureData1I, vpar_PictureData1P, vpar_PictureData1B,
879 vpar_PictureData1D };
881 pf_picture_data[p_vpar->picture.i_coding_type]( p_vpar );
883 vpar_PictureDataGENERIC( p_vpar );
887 /* Wait for all the macroblocks to be decoded. */
888 p_vpar->pool.pf_wait_pool( &p_vpar->pool );
890 /* Re-spawn decoder threads if the user changed settings. */
891 vpar_SpawnPool( p_vpar );
893 if( p_vpar->p_fifo->b_die || p_vpar->p_fifo->b_error )
898 if( p_vpar->sequence.p_forward != NULL &&
899 p_vpar->sequence.p_forward->i_planes == 0 )
901 /* This can only happen with the fake picture created for section
902 * 7.6.3.5. Clean up our mess. */
903 p_vpar->sequence.p_forward = NULL;
906 if( p_vpar->picture.b_error )
909 p_vpar->pc_malformed_pictures[p_vpar->picture.i_coding_type]++;
911 vpar_SynchroEnd( p_vpar, p_vpar->picture.i_coding_type,
912 p_vpar->picture.i_structure, 1 );
913 vout_DestroyPicture( p_vpar->p_vout, P_picture );
915 ReferenceReplace( p_vpar, p_vpar->picture.i_coding_type, NULL );
917 /* Prepare context for the next picture. */
919 if( p_vpar->picture.i_current_structure == FRAME_STRUCTURE )
920 p_vpar->picture.i_current_structure = 0;
922 else if( p_vpar->picture.i_current_structure == FRAME_STRUCTURE )
924 /* Frame completely parsed. */
925 vpar_SynchroEnd( p_vpar, p_vpar->picture.i_coding_type,
926 p_vpar->picture.i_structure, 0 );
927 vout_DisplayPicture( p_vpar->p_vout, P_picture );
929 /* Prepare context for the next picture. */
931 p_vpar->picture.i_current_structure = 0;
936 /*****************************************************************************
937 * ExtensionAndUserData : Parse the extension_and_user_data structure
938 *****************************************************************************/
939 static void ExtensionAndUserData( vpar_thread_t * p_vpar )
941 while( !p_vpar->p_fifo->b_die )
943 NextStartCode( &p_vpar->bit_stream );
944 switch( ShowBits( &p_vpar->bit_stream, 32 ) )
946 case EXTENSION_START_CODE:
947 RemoveBits32( &p_vpar->bit_stream );
948 switch( GetBits( &p_vpar->bit_stream, 4 ) )
950 case SEQUENCE_DISPLAY_EXTENSION_ID:
951 SequenceDisplayExtension( p_vpar );
953 case QUANT_MATRIX_EXTENSION_ID:
954 QuantMatrixExtension( p_vpar );
956 case SEQUENCE_SCALABLE_EXTENSION_ID:
957 SequenceScalableExtension( p_vpar );
959 case PICTURE_DISPLAY_EXTENSION_ID:
960 PictureDisplayExtension( p_vpar );
962 case PICTURE_SPATIAL_SCALABLE_EXTENSION_ID:
963 PictureSpatialScalableExtension( p_vpar );
965 case PICTURE_TEMPORAL_SCALABLE_EXTENSION_ID:
966 PictureTemporalScalableExtension( p_vpar );
968 case COPYRIGHT_EXTENSION_ID:
969 CopyrightExtension( p_vpar );
976 case USER_DATA_START_CODE:
977 RemoveBits32( &p_vpar->bit_stream );
978 /* Wait for the next start code */
988 /*****************************************************************************
989 * SequenceDisplayExtension : Parse the sequence_display_extension structure *
990 *****************************************************************************/
992 static void SequenceDisplayExtension( vpar_thread_t * p_vpar )
994 /* We don't care sequence_display_extension. */
996 RemoveBits( &p_vpar->bit_stream, 3 );
997 if( GetBits( &p_vpar->bit_stream, 1 ) )
999 /* Two bytes for color_desciption */
1000 RemoveBits( &p_vpar->bit_stream, 16 );
1001 p_vpar->sequence.i_matrix_coefficients = GetBits( &p_vpar->bit_stream, 8 );
1003 /* display_horizontal and vertical_size and a marker_bit */
1004 RemoveBits( &p_vpar->bit_stream, 29 );
1008 /*****************************************************************************
1009 * QuantMatrixExtension : Load quantization matrices for luminance *
1011 *****************************************************************************/
1013 static void QuantMatrixExtension( vpar_thread_t * p_vpar )
1015 if( GetBits( &p_vpar->bit_stream, 1 ) )
1017 /* Load intra_quantiser_matrix for luminance. */
1018 LoadMatrix( p_vpar, &p_vpar->sequence.intra_quant );
1022 /* Use the default matrix. */
1023 LinkMatrix( &p_vpar->sequence.intra_quant,
1024 p_vpar->pi_default_intra_quant );
1026 if( GetBits( &p_vpar->bit_stream, 1 ) )
1028 /* Load non_intra_quantiser_matrix for luminance. */
1029 LoadMatrix( p_vpar, &p_vpar->sequence.nonintra_quant );
1033 /* Use the default matrix. */
1034 LinkMatrix( &p_vpar->sequence.nonintra_quant,
1035 p_vpar->pi_default_nonintra_quant );
1037 if( GetBits( &p_vpar->bit_stream, 1 ) )
1039 /* Load intra_quantiser_matrix for chrominance. */
1040 LoadMatrix( p_vpar, &p_vpar->sequence.chroma_intra_quant );
1044 /* Link the chrominance intra matrix to the luminance one. */
1045 LinkMatrix( &p_vpar->sequence.chroma_intra_quant,
1046 p_vpar->sequence.intra_quant.pi_matrix );
1048 if( GetBits( &p_vpar->bit_stream, 1 ) )
1050 /* Load non_intra_quantiser_matrix for chrominance. */
1051 LoadMatrix( p_vpar, &p_vpar->sequence.chroma_nonintra_quant );
1055 /* Link the chrominance nonintra matrix to the luminance one. */
1056 LinkMatrix( &p_vpar->sequence.chroma_nonintra_quant,
1057 p_vpar->sequence.nonintra_quant.pi_matrix );
1062 /*****************************************************************************
1063 * SequenceScalableExtension : Parse the sequence_scalable_extension *
1064 * structure to handle scalable coding *
1065 *****************************************************************************/
1067 static void SequenceScalableExtension( vpar_thread_t * p_vpar )
1069 /* We don't care about anything scalable except the scalable mode. */
1070 switch( p_vpar->sequence.i_scalable_mode = GetBits( &p_vpar->bit_stream, 2 ) )
1071 /* The length of the structure depends on the value of the scalable_mode */
1074 RemoveBits32( &p_vpar->bit_stream );
1075 RemoveBits( &p_vpar->bit_stream, 21 );
1078 RemoveBits( &p_vpar->bit_stream, 12 );
1081 RemoveBits( &p_vpar->bit_stream, 4 );
1085 /*****************************************************************************
1086 * PictureDisplayExtension : Parse the picture_display_extension structure *
1087 *****************************************************************************/
1089 static void PictureDisplayExtension( vpar_thread_t * p_vpar )
1091 /* Number of frame center offset */
1093 /* I am not sure it works but it should
1094 (fewer tests than shown in §6.3.12) */
1095 i_nb = p_vpar->sequence.b_progressive ? p_vpar->sequence.b_progressive +
1096 p_vpar->picture.b_repeat_first_field +
1097 p_vpar->picture.b_top_field_first
1098 : ( p_vpar->picture.b_frame_structure + 1 ) +
1099 p_vpar->picture.b_repeat_first_field;
1100 for( i_dummy = 0; i_dummy < i_nb; i_dummy++ )
1102 RemoveBits( &p_vpar->bit_stream, 17 );
1103 RemoveBits( &p_vpar->bit_stream, 17 );
1108 /*****************************************************************************
1109 * PictureSpatialScalableExtension *
1110 *****************************************************************************/
1112 static void PictureSpatialScalableExtension( vpar_thread_t * p_vpar )
1114 /* That's scalable, so we trash it */
1115 RemoveBits32( &p_vpar->bit_stream );
1116 RemoveBits( &p_vpar->bit_stream, 16 );
1120 /*****************************************************************************
1121 * PictureTemporalScalableExtension *
1122 *****************************************************************************/
1124 static void PictureTemporalScalableExtension( vpar_thread_t * p_vpar )
1126 /* Scalable again, trashed again */
1127 RemoveBits( &p_vpar->bit_stream, 23 );
1131 /*****************************************************************************
1132 * CopyrightExtension : Keeps some legal informations *
1133 *****************************************************************************/
1135 static void CopyrightExtension( vpar_thread_t * p_vpar )
1137 u32 i_copyright_nb_1, i_copyright_nb_2; /* local integers */
1138 p_vpar->sequence.b_copyright_flag = GetBits( &p_vpar->bit_stream, 1 );
1139 /* A flag that says whether the copyright information is significant */
1140 p_vpar->sequence.i_copyright_id = GetBits( &p_vpar->bit_stream, 8 );
1141 /* An identifier compliant with ISO/CEI JTC 1/SC 29 */
1142 p_vpar->sequence.b_original = GetBits( &p_vpar->bit_stream, 1 );
1144 RemoveBits( &p_vpar->bit_stream, 8 );
1145 /* The copyright_number is split in three parts */
1147 i_copyright_nb_1 = GetBits( &p_vpar->bit_stream, 20 );
1148 RemoveBits( &p_vpar->bit_stream, 1 );
1150 i_copyright_nb_2 = GetBits( &p_vpar->bit_stream, 22 );
1151 RemoveBits( &p_vpar->bit_stream, 1 );
1152 /* third part and sum */
1153 p_vpar->sequence.i_copyright_nb = ( (u64)i_copyright_nb_1 << 44 ) |
1154 ( (u64)i_copyright_nb_2 << 22 ) |
1155 ( (u64)GetBits( &p_vpar->bit_stream, 22 ) );