2 * Copyright (C) 2003-2004 the ffmpeg project
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * On2 VP3 Video Decoder
25 * VP3 Video Decoder by Mike Melanson (mike at multimedia.cx)
26 * For more information about the VP3 coding process, visit:
27 * http://wiki.multimedia.cx/index.php?title=On2_VP3
29 * Theora decoder by Alex Beregszaszi
39 #include "bitstream.h"
44 #define FRAGMENT_PIXELS 8
46 typedef struct Coeff
{
52 //FIXME split things out into their own arrays
53 typedef struct Vp3Fragment
{
55 /* address of first pixel taking into account which plane the fragment
56 * lives on as well as the plane stride */
58 /* this is the macroblock that the fragment belongs to */
60 uint8_t coding_method
;
65 #define SB_NOT_CODED 0
66 #define SB_PARTIALLY_CODED 1
67 #define SB_FULLY_CODED 2
69 #define MODE_INTER_NO_MV 0
71 #define MODE_INTER_PLUS_MV 2
72 #define MODE_INTER_LAST_MV 3
73 #define MODE_INTER_PRIOR_LAST 4
74 #define MODE_USING_GOLDEN 5
75 #define MODE_GOLDEN_MV 6
76 #define MODE_INTER_FOURMV 7
77 #define CODING_MODE_COUNT 8
79 /* special internal mode */
82 /* There are 6 preset schemes, plus a free-form scheme */
83 static const int ModeAlphabet
[6][CODING_MODE_COUNT
] =
85 /* scheme 1: Last motion vector dominates */
86 { MODE_INTER_LAST_MV
, MODE_INTER_PRIOR_LAST
,
87 MODE_INTER_PLUS_MV
, MODE_INTER_NO_MV
,
88 MODE_INTRA
, MODE_USING_GOLDEN
,
89 MODE_GOLDEN_MV
, MODE_INTER_FOURMV
},
92 { MODE_INTER_LAST_MV
, MODE_INTER_PRIOR_LAST
,
93 MODE_INTER_NO_MV
, MODE_INTER_PLUS_MV
,
94 MODE_INTRA
, MODE_USING_GOLDEN
,
95 MODE_GOLDEN_MV
, MODE_INTER_FOURMV
},
98 { MODE_INTER_LAST_MV
, MODE_INTER_PLUS_MV
,
99 MODE_INTER_PRIOR_LAST
, MODE_INTER_NO_MV
,
100 MODE_INTRA
, MODE_USING_GOLDEN
,
101 MODE_GOLDEN_MV
, MODE_INTER_FOURMV
},
104 { MODE_INTER_LAST_MV
, MODE_INTER_PLUS_MV
,
105 MODE_INTER_NO_MV
, MODE_INTER_PRIOR_LAST
,
106 MODE_INTRA
, MODE_USING_GOLDEN
,
107 MODE_GOLDEN_MV
, MODE_INTER_FOURMV
},
109 /* scheme 5: No motion vector dominates */
110 { MODE_INTER_NO_MV
, MODE_INTER_LAST_MV
,
111 MODE_INTER_PRIOR_LAST
, MODE_INTER_PLUS_MV
,
112 MODE_INTRA
, MODE_USING_GOLDEN
,
113 MODE_GOLDEN_MV
, MODE_INTER_FOURMV
},
116 { MODE_INTER_NO_MV
, MODE_USING_GOLDEN
,
117 MODE_INTER_LAST_MV
, MODE_INTER_PRIOR_LAST
,
118 MODE_INTER_PLUS_MV
, MODE_INTRA
,
119 MODE_GOLDEN_MV
, MODE_INTER_FOURMV
},
123 #define MIN_DEQUANT_VAL 2
125 typedef struct Vp3DecodeContext
{
126 AVCodecContext
*avctx
;
127 int theora
, theora_tables
;
130 AVFrame golden_frame
;
132 AVFrame current_frame
;
140 int last_quality_index
;
142 int superblock_count
;
143 int y_superblock_width
;
144 int y_superblock_height
;
145 int c_superblock_width
;
146 int c_superblock_height
;
147 int u_superblock_start
;
148 int v_superblock_start
;
149 unsigned char *superblock_coding
;
151 int macroblock_count
;
152 int macroblock_width
;
153 int macroblock_height
;
159 Vp3Fragment
*all_fragments
;
160 uint8_t *coeff_counts
;
163 int fragment_start
[3];
168 uint16_t coded_dc_scale_factor
[64];
169 uint32_t coded_ac_scale_factor
[64];
170 uint8_t base_matrix
[384][64];
171 uint8_t qr_count
[2][3];
172 uint8_t qr_size
[2][3][64];
173 uint16_t qr_base
[2][3][64];
175 /* this is a list of indexes into the all_fragments array indicating
176 * which of the fragments are coded */
177 int *coded_fragment_list
;
178 int coded_fragment_list_index
;
179 int pixel_addresses_initialized
;
187 VLC superblock_run_length_vlc
;
188 VLC fragment_run_length_vlc
;
190 VLC motion_vector_vlc
;
192 /* these arrays need to be on 16-byte boundaries since SSE2 operations
194 DECLARE_ALIGNED_16(int16_t, qmat
[2][4][64]); //<qmat[is_inter][plane]
196 /* This table contains superblock_count * 16 entries. Each set of 16
197 * numbers corresponds to the fragment indexes 0..15 of the superblock.
198 * An entry will be -1 to indicate that no entry corresponds to that
200 int *superblock_fragments
;
202 /* This table contains superblock_count * 4 entries. Each set of 4
203 * numbers corresponds to the macroblock indexes 0..3 of the superblock.
204 * An entry will be -1 to indicate that no entry corresponds to that
206 int *superblock_macroblocks
;
208 /* This table contains macroblock_count * 6 entries. Each set of 6
209 * numbers corresponds to the fragment indexes 0..5 which comprise
210 * the macroblock (4 Y fragments and 2 C fragments). */
211 int *macroblock_fragments
;
212 /* This is an array that indicates how a particular macroblock
214 unsigned char *macroblock_coding
;
216 int first_coded_y_fragment
;
217 int first_coded_c_fragment
;
218 int last_coded_y_fragment
;
219 int last_coded_c_fragment
;
221 uint8_t edge_emu_buffer
[9*2048]; //FIXME dynamic alloc
222 int8_t qscale_table
[2048]; //FIXME dynamic alloc (width+15)/16
229 uint16_t huffman_table
[80][32][2];
231 uint8_t filter_limit_values
[64];
232 DECLARE_ALIGNED_8(int, bounding_values_array
[256+2]);
235 /************************************************************************
236 * VP3 specific functions
237 ************************************************************************/
240 * This function sets up all of the various blocks mappings:
241 * superblocks <-> fragments, macroblocks <-> fragments,
242 * superblocks <-> macroblocks
244 * Returns 0 is successful; returns 1 if *anything* went wrong.
246 static int init_block_mapping(Vp3DecodeContext
*s
)
249 signed int hilbert_walk_mb
[4];
251 int current_fragment
= 0;
252 int current_width
= 0;
253 int current_height
= 0;
256 int superblock_row_inc
= 0;
258 int mapping_index
= 0;
260 int current_macroblock
;
263 signed char travel_width
[16] = {
270 signed char travel_height
[16] = {
277 signed char travel_width_mb
[4] = {
281 signed char travel_height_mb
[4] = {
285 hilbert_walk_mb
[0] = 1;
286 hilbert_walk_mb
[1] = s
->macroblock_width
;
287 hilbert_walk_mb
[2] = 1;
288 hilbert_walk_mb
[3] = -s
->macroblock_width
;
290 /* iterate through each superblock (all planes) and map the fragments */
291 for (i
= 0; i
< s
->superblock_count
; i
++) {
292 /* time to re-assign the limits? */
295 /* start of Y superblocks */
296 right_edge
= s
->fragment_width
;
297 bottom_edge
= s
->fragment_height
;
300 superblock_row_inc
= 3 * s
->fragment_width
-
301 (s
->y_superblock_width
* 4 - s
->fragment_width
);
303 /* the first operation for this variable is to advance by 1 */
304 current_fragment
= -1;
306 } else if (i
== s
->u_superblock_start
) {
308 /* start of U superblocks */
309 right_edge
= s
->fragment_width
/ 2;
310 bottom_edge
= s
->fragment_height
/ 2;
313 superblock_row_inc
= 3 * (s
->fragment_width
/ 2) -
314 (s
->c_superblock_width
* 4 - s
->fragment_width
/ 2);
316 /* the first operation for this variable is to advance by 1 */
317 current_fragment
= s
->fragment_start
[1] - 1;
319 } else if (i
== s
->v_superblock_start
) {
321 /* start of V superblocks */
322 right_edge
= s
->fragment_width
/ 2;
323 bottom_edge
= s
->fragment_height
/ 2;
326 superblock_row_inc
= 3 * (s
->fragment_width
/ 2) -
327 (s
->c_superblock_width
* 4 - s
->fragment_width
/ 2);
329 /* the first operation for this variable is to advance by 1 */
330 current_fragment
= s
->fragment_start
[2] - 1;
334 if (current_width
>= right_edge
- 1) {
335 /* reset width and move to next superblock row */
339 /* fragment is now at the start of a new superblock row */
340 current_fragment
+= superblock_row_inc
;
343 /* iterate through all 16 fragments in a superblock */
344 for (j
= 0; j
< 16; j
++) {
345 current_fragment
+= travel_width
[j
] + right_edge
* travel_height
[j
];
346 current_width
+= travel_width
[j
];
347 current_height
+= travel_height
[j
];
349 /* check if the fragment is in bounds */
350 if ((current_width
< right_edge
) &&
351 (current_height
< bottom_edge
)) {
352 s
->superblock_fragments
[mapping_index
] = current_fragment
;
354 s
->superblock_fragments
[mapping_index
] = -1;
361 /* initialize the superblock <-> macroblock mapping; iterate through
362 * all of the Y plane superblocks to build this mapping */
363 right_edge
= s
->macroblock_width
;
364 bottom_edge
= s
->macroblock_height
;
367 superblock_row_inc
= s
->macroblock_width
-
368 (s
->y_superblock_width
* 2 - s
->macroblock_width
);
369 hilbert
= hilbert_walk_mb
;
371 current_macroblock
= -1;
372 for (i
= 0; i
< s
->u_superblock_start
; i
++) {
374 if (current_width
>= right_edge
- 1) {
375 /* reset width and move to next superblock row */
379 /* macroblock is now at the start of a new superblock row */
380 current_macroblock
+= superblock_row_inc
;
383 /* iterate through each potential macroblock in the superblock */
384 for (j
= 0; j
< 4; j
++) {
385 current_macroblock
+= hilbert_walk_mb
[j
];
386 current_width
+= travel_width_mb
[j
];
387 current_height
+= travel_height_mb
[j
];
389 /* check if the macroblock is in bounds */
390 if ((current_width
< right_edge
) &&
391 (current_height
< bottom_edge
)) {
392 s
->superblock_macroblocks
[mapping_index
] = current_macroblock
;
394 s
->superblock_macroblocks
[mapping_index
] = -1;
401 /* initialize the macroblock <-> fragment mapping */
402 current_fragment
= 0;
403 current_macroblock
= 0;
405 for (i
= 0; i
< s
->fragment_height
; i
+= 2) {
407 for (j
= 0; j
< s
->fragment_width
; j
+= 2) {
409 s
->all_fragments
[current_fragment
].macroblock
= current_macroblock
;
410 s
->macroblock_fragments
[mapping_index
++] = current_fragment
;
412 if (j
+ 1 < s
->fragment_width
) {
413 s
->all_fragments
[current_fragment
+ 1].macroblock
= current_macroblock
;
414 s
->macroblock_fragments
[mapping_index
++] = current_fragment
+ 1;
416 s
->macroblock_fragments
[mapping_index
++] = -1;
418 if (i
+ 1 < s
->fragment_height
) {
419 s
->all_fragments
[current_fragment
+ s
->fragment_width
].macroblock
=
421 s
->macroblock_fragments
[mapping_index
++] =
422 current_fragment
+ s
->fragment_width
;
424 s
->macroblock_fragments
[mapping_index
++] = -1;
426 if ((j
+ 1 < s
->fragment_width
) && (i
+ 1 < s
->fragment_height
)) {
427 s
->all_fragments
[current_fragment
+ s
->fragment_width
+ 1].macroblock
=
429 s
->macroblock_fragments
[mapping_index
++] =
430 current_fragment
+ s
->fragment_width
+ 1;
432 s
->macroblock_fragments
[mapping_index
++] = -1;
435 c_fragment
= s
->fragment_start
[1] +
436 (i
* s
->fragment_width
/ 4) + (j
/ 2);
437 s
->all_fragments
[c_fragment
].macroblock
= s
->macroblock_count
;
438 s
->macroblock_fragments
[mapping_index
++] = c_fragment
;
440 c_fragment
= s
->fragment_start
[2] +
441 (i
* s
->fragment_width
/ 4) + (j
/ 2);
442 s
->all_fragments
[c_fragment
].macroblock
= s
->macroblock_count
;
443 s
->macroblock_fragments
[mapping_index
++] = c_fragment
;
445 if (j
+ 2 <= s
->fragment_width
)
446 current_fragment
+= 2;
449 current_macroblock
++;
452 current_fragment
+= s
->fragment_width
;
455 return 0; /* successful path out */
459 * This function wipes out all of the fragment data.
461 static void init_frame(Vp3DecodeContext
*s
, GetBitContext
*gb
)
465 /* zero out all of the fragment information */
466 s
->coded_fragment_list_index
= 0;
467 for (i
= 0; i
< s
->fragment_count
; i
++) {
468 s
->coeff_counts
[i
] = 0;
469 s
->all_fragments
[i
].motion_x
= 127;
470 s
->all_fragments
[i
].motion_y
= 127;
471 s
->all_fragments
[i
].next_coeff
= NULL
;
473 s
->coeffs
[i
].coeff
=0;
474 s
->coeffs
[i
].next
= NULL
;
479 * This function sets up the dequantization tables used for a particular
482 static void init_dequantizer(Vp3DecodeContext
*s
)
484 int ac_scale_factor
= s
->coded_ac_scale_factor
[s
->quality_index
];
485 int dc_scale_factor
= s
->coded_dc_scale_factor
[s
->quality_index
];
486 int i
, plane
, inter
, qri
, bmi
, bmj
, qistart
;
488 for(inter
=0; inter
<2; inter
++){
489 for(plane
=0; plane
<3; plane
++){
491 for(qri
=0; qri
<s
->qr_count
[inter
][plane
]; qri
++){
492 sum
+= s
->qr_size
[inter
][plane
][qri
];
493 if(s
->quality_index
<= sum
)
496 qistart
= sum
- s
->qr_size
[inter
][plane
][qri
];
497 bmi
= s
->qr_base
[inter
][plane
][qri
];
498 bmj
= s
->qr_base
[inter
][plane
][qri
+1];
500 int coeff
= ( 2*(sum
-s
->quality_index
)*s
->base_matrix
[bmi
][i
]
501 - 2*(qistart
-s
->quality_index
)*s
->base_matrix
[bmj
][i
]
502 + s
->qr_size
[inter
][plane
][qri
])
503 / (2*s
->qr_size
[inter
][plane
][qri
]);
505 int qmin
= 8<<(inter
+ !i
);
506 int qscale
= i
? ac_scale_factor
: dc_scale_factor
;
508 s
->qmat
[inter
][plane
][s
->dsp
.idct_permutation
[i
]]= av_clip((qscale
* coeff
)/100 * 4, qmin
, 4096);
513 memset(s
->qscale_table
, (FFMAX(s
->qmat
[0][0][1], s
->qmat
[0][1][1])+8)/16, 512); //FIXME finetune
517 * This function initializes the loop filter boundary limits if the frame's
518 * quality index is different from the previous frame's.
520 static void init_loop_filter(Vp3DecodeContext
*s
)
522 int *bounding_values
= s
->bounding_values_array
+127;
526 filter_limit
= s
->filter_limit_values
[s
->quality_index
];
528 /* set up the bounding values */
529 memset(s
->bounding_values_array
, 0, 256 * sizeof(int));
530 for (x
= 0; x
< filter_limit
; x
++) {
531 bounding_values
[-x
- filter_limit
] = -filter_limit
+ x
;
532 bounding_values
[-x
] = -x
;
533 bounding_values
[x
] = x
;
534 bounding_values
[x
+ filter_limit
] = filter_limit
- x
;
536 bounding_values
[129] = bounding_values
[130] = filter_limit
* 0x02020202;
540 * This function unpacks all of the superblock/macroblock/fragment coding
541 * information from the bitstream.
543 static int unpack_superblocks(Vp3DecodeContext
*s
, GetBitContext
*gb
)
546 int current_superblock
= 0;
548 int decode_fully_flags
= 0;
549 int decode_partial_blocks
= 0;
550 int first_c_fragment_seen
;
553 int current_fragment
;
556 memset(s
->superblock_coding
, SB_FULLY_CODED
, s
->superblock_count
);
560 /* unpack the list of partially-coded superblocks */
562 /* toggle the bit because as soon as the first run length is
563 * fetched the bit will be toggled again */
565 while (current_superblock
< s
->superblock_count
) {
566 if (current_run
-- == 0) {
568 current_run
= get_vlc2(gb
,
569 s
->superblock_run_length_vlc
.table
, 6, 2);
570 if (current_run
== 33)
571 current_run
+= get_bits(gb
, 12);
573 /* if any of the superblocks are not partially coded, flag
574 * a boolean to decode the list of fully-coded superblocks */
576 decode_fully_flags
= 1;
579 /* make a note of the fact that there are partially coded
581 decode_partial_blocks
= 1;
584 s
->superblock_coding
[current_superblock
++] = bit
;
587 /* unpack the list of fully coded superblocks if any of the blocks were
588 * not marked as partially coded in the previous step */
589 if (decode_fully_flags
) {
591 current_superblock
= 0;
594 /* toggle the bit because as soon as the first run length is
595 * fetched the bit will be toggled again */
597 while (current_superblock
< s
->superblock_count
) {
599 /* skip any superblocks already marked as partially coded */
600 if (s
->superblock_coding
[current_superblock
] == SB_NOT_CODED
) {
602 if (current_run
-- == 0) {
604 current_run
= get_vlc2(gb
,
605 s
->superblock_run_length_vlc
.table
, 6, 2);
606 if (current_run
== 33)
607 current_run
+= get_bits(gb
, 12);
609 s
->superblock_coding
[current_superblock
] = 2*bit
;
611 current_superblock
++;
615 /* if there were partial blocks, initialize bitstream for
616 * unpacking fragment codings */
617 if (decode_partial_blocks
) {
621 /* toggle the bit because as soon as the first run length is
622 * fetched the bit will be toggled again */
627 /* figure out which fragments are coded; iterate through each
628 * superblock (all planes) */
629 s
->coded_fragment_list_index
= 0;
630 s
->next_coeff
= s
->coeffs
+ s
->fragment_count
;
631 s
->first_coded_y_fragment
= s
->first_coded_c_fragment
= 0;
632 s
->last_coded_y_fragment
= s
->last_coded_c_fragment
= -1;
633 first_c_fragment_seen
= 0;
634 memset(s
->macroblock_coding
, MODE_COPY
, s
->macroblock_count
);
635 for (i
= 0; i
< s
->superblock_count
; i
++) {
637 /* iterate through all 16 fragments in a superblock */
638 for (j
= 0; j
< 16; j
++) {
640 /* if the fragment is in bounds, check its coding status */
641 current_fragment
= s
->superblock_fragments
[i
* 16 + j
];
642 if (current_fragment
>= s
->fragment_count
) {
643 av_log(s
->avctx
, AV_LOG_ERROR
, " vp3:unpack_superblocks(): bad fragment number (%d >= %d)\n",
644 current_fragment
, s
->fragment_count
);
647 if (current_fragment
!= -1) {
648 if (s
->superblock_coding
[i
] == SB_NOT_CODED
) {
650 /* copy all the fragments from the prior frame */
651 s
->all_fragments
[current_fragment
].coding_method
=
654 } else if (s
->superblock_coding
[i
] == SB_PARTIALLY_CODED
) {
656 /* fragment may or may not be coded; this is the case
657 * that cares about the fragment coding runs */
658 if (current_run
-- == 0) {
660 current_run
= get_vlc2(gb
,
661 s
->fragment_run_length_vlc
.table
, 5, 2);
665 /* default mode; actual mode will be decoded in
667 s
->all_fragments
[current_fragment
].coding_method
=
669 s
->all_fragments
[current_fragment
].next_coeff
= s
->coeffs
+ current_fragment
;
670 s
->coded_fragment_list
[s
->coded_fragment_list_index
] =
672 if ((current_fragment
>= s
->fragment_start
[1]) &&
673 (s
->last_coded_y_fragment
== -1) &&
674 (!first_c_fragment_seen
)) {
675 s
->first_coded_c_fragment
= s
->coded_fragment_list_index
;
676 s
->last_coded_y_fragment
= s
->first_coded_c_fragment
- 1;
677 first_c_fragment_seen
= 1;
679 s
->coded_fragment_list_index
++;
680 s
->macroblock_coding
[s
->all_fragments
[current_fragment
].macroblock
] = MODE_INTER_NO_MV
;
682 /* not coded; copy this fragment from the prior frame */
683 s
->all_fragments
[current_fragment
].coding_method
=
689 /* fragments are fully coded in this superblock; actual
690 * coding will be determined in next step */
691 s
->all_fragments
[current_fragment
].coding_method
=
693 s
->all_fragments
[current_fragment
].next_coeff
= s
->coeffs
+ current_fragment
;
694 s
->coded_fragment_list
[s
->coded_fragment_list_index
] =
696 if ((current_fragment
>= s
->fragment_start
[1]) &&
697 (s
->last_coded_y_fragment
== -1) &&
698 (!first_c_fragment_seen
)) {
699 s
->first_coded_c_fragment
= s
->coded_fragment_list_index
;
700 s
->last_coded_y_fragment
= s
->first_coded_c_fragment
- 1;
701 first_c_fragment_seen
= 1;
703 s
->coded_fragment_list_index
++;
704 s
->macroblock_coding
[s
->all_fragments
[current_fragment
].macroblock
] = MODE_INTER_NO_MV
;
710 if (!first_c_fragment_seen
)
711 /* only Y fragments coded in this frame */
712 s
->last_coded_y_fragment
= s
->coded_fragment_list_index
- 1;
714 /* end the list of coded C fragments */
715 s
->last_coded_c_fragment
= s
->coded_fragment_list_index
- 1;
721 * This function unpacks all the coding mode data for individual macroblocks
722 * from the bitstream.
724 static int unpack_modes(Vp3DecodeContext
*s
, GetBitContext
*gb
)
728 int current_macroblock
;
729 int current_fragment
;
731 int custom_mode_alphabet
[CODING_MODE_COUNT
];
734 for (i
= 0; i
< s
->fragment_count
; i
++)
735 s
->all_fragments
[i
].coding_method
= MODE_INTRA
;
739 /* fetch the mode coding scheme for this frame */
740 scheme
= get_bits(gb
, 3);
742 /* is it a custom coding scheme? */
744 for (i
= 0; i
< 8; i
++)
745 custom_mode_alphabet
[get_bits(gb
, 3)] = i
;
748 /* iterate through all of the macroblocks that contain 1 or more
750 for (i
= 0; i
< s
->u_superblock_start
; i
++) {
752 for (j
= 0; j
< 4; j
++) {
753 current_macroblock
= s
->superblock_macroblocks
[i
* 4 + j
];
754 if ((current_macroblock
== -1) ||
755 (s
->macroblock_coding
[current_macroblock
] == MODE_COPY
))
757 if (current_macroblock
>= s
->macroblock_count
) {
758 av_log(s
->avctx
, AV_LOG_ERROR
, " vp3:unpack_modes(): bad macroblock number (%d >= %d)\n",
759 current_macroblock
, s
->macroblock_count
);
763 /* mode 7 means get 3 bits for each coding mode */
765 coding_mode
= get_bits(gb
, 3);
767 coding_mode
= custom_mode_alphabet
768 [get_vlc2(gb
, s
->mode_code_vlc
.table
, 3, 3)];
770 coding_mode
= ModeAlphabet
[scheme
-1]
771 [get_vlc2(gb
, s
->mode_code_vlc
.table
, 3, 3)];
773 s
->macroblock_coding
[current_macroblock
] = coding_mode
;
774 for (k
= 0; k
< 6; k
++) {
776 s
->macroblock_fragments
[current_macroblock
* 6 + k
];
777 if (current_fragment
== -1)
779 if (current_fragment
>= s
->fragment_count
) {
780 av_log(s
->avctx
, AV_LOG_ERROR
, " vp3:unpack_modes(): bad fragment number (%d >= %d)\n",
781 current_fragment
, s
->fragment_count
);
784 if (s
->all_fragments
[current_fragment
].coding_method
!=
786 s
->all_fragments
[current_fragment
].coding_method
=
797 * This function unpacks all the motion vectors for the individual
798 * macroblocks from the bitstream.
800 static int unpack_vectors(Vp3DecodeContext
*s
, GetBitContext
*gb
)
806 int last_motion_x
= 0;
807 int last_motion_y
= 0;
808 int prior_last_motion_x
= 0;
809 int prior_last_motion_y
= 0;
810 int current_macroblock
;
811 int current_fragment
;
816 memset(motion_x
, 0, 6 * sizeof(int));
817 memset(motion_y
, 0, 6 * sizeof(int));
819 /* coding mode 0 is the VLC scheme; 1 is the fixed code scheme */
820 coding_mode
= get_bits1(gb
);
822 /* iterate through all of the macroblocks that contain 1 or more
824 for (i
= 0; i
< s
->u_superblock_start
; i
++) {
826 for (j
= 0; j
< 4; j
++) {
827 current_macroblock
= s
->superblock_macroblocks
[i
* 4 + j
];
828 if ((current_macroblock
== -1) ||
829 (s
->macroblock_coding
[current_macroblock
] == MODE_COPY
))
831 if (current_macroblock
>= s
->macroblock_count
) {
832 av_log(s
->avctx
, AV_LOG_ERROR
, " vp3:unpack_vectors(): bad macroblock number (%d >= %d)\n",
833 current_macroblock
, s
->macroblock_count
);
837 current_fragment
= s
->macroblock_fragments
[current_macroblock
* 6];
838 if (current_fragment
>= s
->fragment_count
) {
839 av_log(s
->avctx
, AV_LOG_ERROR
, " vp3:unpack_vectors(): bad fragment number (%d >= %d\n",
840 current_fragment
, s
->fragment_count
);
843 switch (s
->macroblock_coding
[current_macroblock
]) {
845 case MODE_INTER_PLUS_MV
:
847 /* all 6 fragments use the same motion vector */
848 if (coding_mode
== 0) {
849 motion_x
[0] = motion_vector_table
[get_vlc2(gb
, s
->motion_vector_vlc
.table
, 6, 2)];
850 motion_y
[0] = motion_vector_table
[get_vlc2(gb
, s
->motion_vector_vlc
.table
, 6, 2)];
852 motion_x
[0] = fixed_motion_vector_table
[get_bits(gb
, 6)];
853 motion_y
[0] = fixed_motion_vector_table
[get_bits(gb
, 6)];
856 for (k
= 1; k
< 6; k
++) {
857 motion_x
[k
] = motion_x
[0];
858 motion_y
[k
] = motion_y
[0];
861 /* vector maintenance, only on MODE_INTER_PLUS_MV */
862 if (s
->macroblock_coding
[current_macroblock
] ==
863 MODE_INTER_PLUS_MV
) {
864 prior_last_motion_x
= last_motion_x
;
865 prior_last_motion_y
= last_motion_y
;
866 last_motion_x
= motion_x
[0];
867 last_motion_y
= motion_y
[0];
871 case MODE_INTER_FOURMV
:
872 /* vector maintenance */
873 prior_last_motion_x
= last_motion_x
;
874 prior_last_motion_y
= last_motion_y
;
876 /* fetch 4 vectors from the bitstream, one for each
877 * Y fragment, then average for the C fragment vectors */
878 motion_x
[4] = motion_y
[4] = 0;
879 for (k
= 0; k
< 4; k
++) {
880 for (l
= 0; l
< s
->coded_fragment_list_index
; l
++)
881 if (s
->coded_fragment_list
[l
] == s
->macroblock_fragments
[6*current_macroblock
+ k
])
883 if (l
< s
->coded_fragment_list_index
) {
884 if (coding_mode
== 0) {
885 motion_x
[k
] = motion_vector_table
[get_vlc2(gb
, s
->motion_vector_vlc
.table
, 6, 2)];
886 motion_y
[k
] = motion_vector_table
[get_vlc2(gb
, s
->motion_vector_vlc
.table
, 6, 2)];
888 motion_x
[k
] = fixed_motion_vector_table
[get_bits(gb
, 6)];
889 motion_y
[k
] = fixed_motion_vector_table
[get_bits(gb
, 6)];
891 last_motion_x
= motion_x
[k
];
892 last_motion_y
= motion_y
[k
];
897 motion_x
[4] += motion_x
[k
];
898 motion_y
[4] += motion_y
[k
];
902 motion_x
[4]= RSHIFT(motion_x
[4], 2);
904 motion_y
[4]= RSHIFT(motion_y
[4], 2);
907 case MODE_INTER_LAST_MV
:
908 /* all 6 fragments use the last motion vector */
909 motion_x
[0] = last_motion_x
;
910 motion_y
[0] = last_motion_y
;
911 for (k
= 1; k
< 6; k
++) {
912 motion_x
[k
] = motion_x
[0];
913 motion_y
[k
] = motion_y
[0];
916 /* no vector maintenance (last vector remains the
920 case MODE_INTER_PRIOR_LAST
:
921 /* all 6 fragments use the motion vector prior to the
922 * last motion vector */
923 motion_x
[0] = prior_last_motion_x
;
924 motion_y
[0] = prior_last_motion_y
;
925 for (k
= 1; k
< 6; k
++) {
926 motion_x
[k
] = motion_x
[0];
927 motion_y
[k
] = motion_y
[0];
930 /* vector maintenance */
931 prior_last_motion_x
= last_motion_x
;
932 prior_last_motion_y
= last_motion_y
;
933 last_motion_x
= motion_x
[0];
934 last_motion_y
= motion_y
[0];
938 /* covers intra, inter without MV, golden without MV */
939 memset(motion_x
, 0, 6 * sizeof(int));
940 memset(motion_y
, 0, 6 * sizeof(int));
942 /* no vector maintenance */
946 /* assign the motion vectors to the correct fragments */
947 for (k
= 0; k
< 6; k
++) {
949 s
->macroblock_fragments
[current_macroblock
* 6 + k
];
950 if (current_fragment
== -1)
952 if (current_fragment
>= s
->fragment_count
) {
953 av_log(s
->avctx
, AV_LOG_ERROR
, " vp3:unpack_vectors(): bad fragment number (%d >= %d)\n",
954 current_fragment
, s
->fragment_count
);
957 s
->all_fragments
[current_fragment
].motion_x
= motion_x
[k
];
958 s
->all_fragments
[current_fragment
].motion_y
= motion_y
[k
];
967 * This function is called by unpack_dct_coeffs() to extract the VLCs from
968 * the bitstream. The VLCs encode tokens which are used to unpack DCT
969 * data. This function unpacks all the VLCs for either the Y plane or both
970 * C planes, and is called for DC coefficients or different AC coefficient
971 * levels (since different coefficient types require different VLC tables.
973 * This function returns a residual eob run. E.g, if a particular token gave
974 * instructions to EOB the next 5 fragments and there were only 2 fragments
975 * left in the current fragment range, 3 would be returned so that it could
976 * be passed into the next call to this same function.
978 static int unpack_vlcs(Vp3DecodeContext
*s
, GetBitContext
*gb
,
979 VLC
*table
, int coeff_index
,
980 int first_fragment
, int last_fragment
,
987 Vp3Fragment
*fragment
;
988 uint8_t *perm
= s
->scantable
.permutated
;
991 if ((first_fragment
>= s
->fragment_count
) ||
992 (last_fragment
>= s
->fragment_count
)) {
994 av_log(s
->avctx
, AV_LOG_ERROR
, " vp3:unpack_vlcs(): bad fragment number (%d -> %d ?)\n",
995 first_fragment
, last_fragment
);
999 for (i
= first_fragment
; i
<= last_fragment
; i
++) {
1000 int fragment_num
= s
->coded_fragment_list
[i
];
1002 if (s
->coeff_counts
[fragment_num
] > coeff_index
)
1004 fragment
= &s
->all_fragments
[fragment_num
];
1007 /* decode a VLC into a token */
1008 token
= get_vlc2(gb
, table
->table
, 5, 3);
1009 /* use the token to get a zero run, a coefficient, and an eob run */
1011 eob_run
= eob_run_base
[token
];
1012 if (eob_run_get_bits
[token
])
1013 eob_run
+= get_bits(gb
, eob_run_get_bits
[token
]);
1014 coeff
= zero_run
= 0;
1016 bits_to_get
= coeff_get_bits
[token
];
1018 coeff
= coeff_tables
[token
][0];
1020 coeff
= coeff_tables
[token
][get_bits(gb
, bits_to_get
)];
1022 zero_run
= zero_run_base
[token
];
1023 if (zero_run_get_bits
[token
])
1024 zero_run
+= get_bits(gb
, zero_run_get_bits
[token
]);
1029 s
->coeff_counts
[fragment_num
] += zero_run
;
1030 if (s
->coeff_counts
[fragment_num
] < 64){
1031 fragment
->next_coeff
->coeff
= coeff
;
1032 fragment
->next_coeff
->index
= perm
[s
->coeff_counts
[fragment_num
]++]; //FIXME perm here already?
1033 fragment
->next_coeff
->next
= s
->next_coeff
;
1034 s
->next_coeff
->next
=NULL
;
1035 fragment
->next_coeff
= s
->next_coeff
++;
1038 s
->coeff_counts
[fragment_num
] |= 128;
1047 * This function unpacks all of the DCT coefficient data from the
1050 static int unpack_dct_coeffs(Vp3DecodeContext
*s
, GetBitContext
*gb
)
1057 int residual_eob_run
= 0;
1059 /* fetch the DC table indexes */
1060 dc_y_table
= get_bits(gb
, 4);
1061 dc_c_table
= get_bits(gb
, 4);
1063 /* unpack the Y plane DC coefficients */
1064 residual_eob_run
= unpack_vlcs(s
, gb
, &s
->dc_vlc
[dc_y_table
], 0,
1065 s
->first_coded_y_fragment
, s
->last_coded_y_fragment
, residual_eob_run
);
1067 /* unpack the C plane DC coefficients */
1068 residual_eob_run
= unpack_vlcs(s
, gb
, &s
->dc_vlc
[dc_c_table
], 0,
1069 s
->first_coded_c_fragment
, s
->last_coded_c_fragment
, residual_eob_run
);
1071 /* fetch the AC table indexes */
1072 ac_y_table
= get_bits(gb
, 4);
1073 ac_c_table
= get_bits(gb
, 4);
1075 /* unpack the group 1 AC coefficients (coeffs 1-5) */
1076 for (i
= 1; i
<= 5; i
++) {
1077 residual_eob_run
= unpack_vlcs(s
, gb
, &s
->ac_vlc_1
[ac_y_table
], i
,
1078 s
->first_coded_y_fragment
, s
->last_coded_y_fragment
, residual_eob_run
);
1080 residual_eob_run
= unpack_vlcs(s
, gb
, &s
->ac_vlc_1
[ac_c_table
], i
,
1081 s
->first_coded_c_fragment
, s
->last_coded_c_fragment
, residual_eob_run
);
1084 /* unpack the group 2 AC coefficients (coeffs 6-14) */
1085 for (i
= 6; i
<= 14; i
++) {
1086 residual_eob_run
= unpack_vlcs(s
, gb
, &s
->ac_vlc_2
[ac_y_table
], i
,
1087 s
->first_coded_y_fragment
, s
->last_coded_y_fragment
, residual_eob_run
);
1089 residual_eob_run
= unpack_vlcs(s
, gb
, &s
->ac_vlc_2
[ac_c_table
], i
,
1090 s
->first_coded_c_fragment
, s
->last_coded_c_fragment
, residual_eob_run
);
1093 /* unpack the group 3 AC coefficients (coeffs 15-27) */
1094 for (i
= 15; i
<= 27; i
++) {
1095 residual_eob_run
= unpack_vlcs(s
, gb
, &s
->ac_vlc_3
[ac_y_table
], i
,
1096 s
->first_coded_y_fragment
, s
->last_coded_y_fragment
, residual_eob_run
);
1098 residual_eob_run
= unpack_vlcs(s
, gb
, &s
->ac_vlc_3
[ac_c_table
], i
,
1099 s
->first_coded_c_fragment
, s
->last_coded_c_fragment
, residual_eob_run
);
1102 /* unpack the group 4 AC coefficients (coeffs 28-63) */
1103 for (i
= 28; i
<= 63; i
++) {
1104 residual_eob_run
= unpack_vlcs(s
, gb
, &s
->ac_vlc_4
[ac_y_table
], i
,
1105 s
->first_coded_y_fragment
, s
->last_coded_y_fragment
, residual_eob_run
);
1107 residual_eob_run
= unpack_vlcs(s
, gb
, &s
->ac_vlc_4
[ac_c_table
], i
,
1108 s
->first_coded_c_fragment
, s
->last_coded_c_fragment
, residual_eob_run
);
1115 * This function reverses the DC prediction for each coded fragment in
1116 * the frame. Much of this function is adapted directly from the original
1119 #define COMPATIBLE_FRAME(x) \
1120 (compatible_frame[s->all_fragments[x].coding_method] == current_frame_type)
1121 #define FRAME_CODED(x) (s->all_fragments[x].coding_method != MODE_COPY)
1122 #define DC_COEFF(u) (s->coeffs[u].index ? 0 : s->coeffs[u].coeff) //FIXME do somethin to simplify this
1124 static void reverse_dc_prediction(Vp3DecodeContext
*s
,
1127 int fragment_height
)
1136 int i
= first_fragment
;
1140 /* DC values for the left, up-left, up, and up-right fragments */
1141 int vl
, vul
, vu
, vur
;
1143 /* indexes for the left, up-left, up, and up-right fragments */
1147 * The 6 fields mean:
1148 * 0: up-left multiplier
1150 * 2: up-right multiplier
1151 * 3: left multiplier
1153 int predictor_transform
[16][4] = {
1155 { 0, 0, 0,128}, // PL
1156 { 0, 0,128, 0}, // PUR
1157 { 0, 0, 53, 75}, // PUR|PL
1158 { 0,128, 0, 0}, // PU
1159 { 0, 64, 0, 64}, // PU|PL
1160 { 0,128, 0, 0}, // PU|PUR
1161 { 0, 0, 53, 75}, // PU|PUR|PL
1162 {128, 0, 0, 0}, // PUL
1163 { 0, 0, 0,128}, // PUL|PL
1164 { 64, 0, 64, 0}, // PUL|PUR
1165 { 0, 0, 53, 75}, // PUL|PUR|PL
1166 { 0,128, 0, 0}, // PUL|PU
1167 {-104,116, 0,116}, // PUL|PU|PL
1168 { 24, 80, 24, 0}, // PUL|PU|PUR
1169 {-104,116, 0,116} // PUL|PU|PUR|PL
1172 /* This table shows which types of blocks can use other blocks for
1173 * prediction. For example, INTRA is the only mode in this table to
1174 * have a frame number of 0. That means INTRA blocks can only predict
1175 * from other INTRA blocks. There are 2 golden frame coding types;
1176 * blocks encoding in these modes can only predict from other blocks
1177 * that were encoded with these 1 of these 2 modes. */
1178 unsigned char compatible_frame
[8] = {
1179 1, /* MODE_INTER_NO_MV */
1181 1, /* MODE_INTER_PLUS_MV */
1182 1, /* MODE_INTER_LAST_MV */
1183 1, /* MODE_INTER_PRIOR_MV */
1184 2, /* MODE_USING_GOLDEN */
1185 2, /* MODE_GOLDEN_MV */
1186 1 /* MODE_INTER_FOUR_MV */
1188 int current_frame_type
;
1190 /* there is a last DC predictor for each of the 3 frame types */
1195 vul
= vu
= vur
= vl
= 0;
1196 last_dc
[0] = last_dc
[1] = last_dc
[2] = 0;
1198 /* for each fragment row... */
1199 for (y
= 0; y
< fragment_height
; y
++) {
1201 /* for each fragment in a row... */
1202 for (x
= 0; x
< fragment_width
; x
++, i
++) {
1204 /* reverse prediction if this block was coded */
1205 if (s
->all_fragments
[i
].coding_method
!= MODE_COPY
) {
1207 current_frame_type
=
1208 compatible_frame
[s
->all_fragments
[i
].coding_method
];
1214 if(FRAME_CODED(l
) && COMPATIBLE_FRAME(l
))
1218 u
= i
-fragment_width
;
1220 if(FRAME_CODED(u
) && COMPATIBLE_FRAME(u
))
1223 ul
= i
-fragment_width
-1;
1225 if(FRAME_CODED(ul
) && COMPATIBLE_FRAME(ul
))
1228 if(x
+ 1 < fragment_width
){
1229 ur
= i
-fragment_width
+1;
1231 if(FRAME_CODED(ur
) && COMPATIBLE_FRAME(ur
))
1236 if (transform
== 0) {
1238 /* if there were no fragments to predict from, use last
1240 predicted_dc
= last_dc
[current_frame_type
];
1243 /* apply the appropriate predictor transform */
1245 (predictor_transform
[transform
][0] * vul
) +
1246 (predictor_transform
[transform
][1] * vu
) +
1247 (predictor_transform
[transform
][2] * vur
) +
1248 (predictor_transform
[transform
][3] * vl
);
1250 predicted_dc
/= 128;
1252 /* check for outranging on the [ul u l] and
1253 * [ul u ur l] predictors */
1254 if ((transform
== 13) || (transform
== 15)) {
1255 if (FFABS(predicted_dc
- vu
) > 128)
1257 else if (FFABS(predicted_dc
- vl
) > 128)
1259 else if (FFABS(predicted_dc
- vul
) > 128)
1264 /* at long last, apply the predictor */
1265 if(s
->coeffs
[i
].index
){
1266 *s
->next_coeff
= s
->coeffs
[i
];
1267 s
->coeffs
[i
].index
=0;
1268 s
->coeffs
[i
].coeff
=0;
1269 s
->coeffs
[i
].next
= s
->next_coeff
++;
1271 s
->coeffs
[i
].coeff
+= predicted_dc
;
1273 last_dc
[current_frame_type
] = DC_COEFF(i
);
1274 if(DC_COEFF(i
) && !(s
->coeff_counts
[i
]&127)){
1275 s
->coeff_counts
[i
]= 129;
1276 // s->all_fragments[i].next_coeff= s->next_coeff;
1277 s
->coeffs
[i
].next
= s
->next_coeff
;
1278 (s
->next_coeff
++)->next
=NULL
;
1286 * Perform the final rendering for a particular slice of data.
1287 * The slice number ranges from 0..(macroblock_height - 1).
1289 static void render_slice(Vp3DecodeContext
*s
, int slice
)
1292 int16_t *dequantizer
;
1293 DECLARE_ALIGNED_16(DCTELEM
, block
[64]);
1294 int motion_x
= 0xdeadbeef, motion_y
= 0xdeadbeef;
1295 int motion_halfpel_index
;
1296 uint8_t *motion_source
;
1298 int current_macroblock_entry
= slice
* s
->macroblock_width
* 6;
1300 if (slice
>= s
->macroblock_height
)
1303 for (plane
= 0; plane
< 3; plane
++) {
1304 uint8_t *output_plane
= s
->current_frame
.data
[plane
];
1305 uint8_t * last_plane
= s
-> last_frame
.data
[plane
];
1306 uint8_t *golden_plane
= s
-> golden_frame
.data
[plane
];
1307 int stride
= s
->current_frame
.linesize
[plane
];
1308 int plane_width
= s
->width
>> !!plane
;
1309 int plane_height
= s
->height
>> !!plane
;
1310 int y
= slice
* FRAGMENT_PIXELS
<< !plane
;
1311 int slice_height
= y
+ (FRAGMENT_PIXELS
<< !plane
);
1312 int i
= s
->macroblock_fragments
[current_macroblock_entry
+ plane
+ 3*!!plane
];
1314 if (!s
->flipped_image
) stride
= -stride
;
1317 if(FFABS(stride
) > 2048)
1318 return; //various tables are fixed size
1320 /* for each fragment row in the slice (both of them)... */
1321 for (; y
< slice_height
; y
+= 8) {
1323 /* for each fragment in a row... */
1324 for (x
= 0; x
< plane_width
; x
+= 8, i
++) {
1326 if ((i
< 0) || (i
>= s
->fragment_count
)) {
1327 av_log(s
->avctx
, AV_LOG_ERROR
, " vp3:render_slice(): bad fragment number (%d)\n", i
);
1331 /* transform if this block was coded */
1332 if ((s
->all_fragments
[i
].coding_method
!= MODE_COPY
) &&
1333 !((s
->avctx
->flags
& CODEC_FLAG_GRAY
) && plane
)) {
1335 if ((s
->all_fragments
[i
].coding_method
== MODE_USING_GOLDEN
) ||
1336 (s
->all_fragments
[i
].coding_method
== MODE_GOLDEN_MV
))
1337 motion_source
= golden_plane
;
1339 motion_source
= last_plane
;
1341 motion_source
+= s
->all_fragments
[i
].first_pixel
;
1342 motion_halfpel_index
= 0;
1344 /* sort out the motion vector if this fragment is coded
1345 * using a motion vector method */
1346 if ((s
->all_fragments
[i
].coding_method
> MODE_INTRA
) &&
1347 (s
->all_fragments
[i
].coding_method
!= MODE_USING_GOLDEN
)) {
1349 motion_x
= s
->all_fragments
[i
].motion_x
;
1350 motion_y
= s
->all_fragments
[i
].motion_y
;
1352 motion_x
= (motion_x
>>1) | (motion_x
&1);
1353 motion_y
= (motion_y
>>1) | (motion_y
&1);
1356 src_x
= (motion_x
>>1) + x
;
1357 src_y
= (motion_y
>>1) + y
;
1358 if ((motion_x
== 127) || (motion_y
== 127))
1359 av_log(s
->avctx
, AV_LOG_ERROR
, " help! got invalid motion vector! (%X, %X)\n", motion_x
, motion_y
);
1361 motion_halfpel_index
= motion_x
& 0x01;
1362 motion_source
+= (motion_x
>> 1);
1364 motion_halfpel_index
|= (motion_y
& 0x01) << 1;
1365 motion_source
+= ((motion_y
>> 1) * stride
);
1367 if(src_x
<0 || src_y
<0 || src_x
+ 9 >= plane_width
|| src_y
+ 9 >= plane_height
){
1368 uint8_t *temp
= s
->edge_emu_buffer
;
1369 if(stride
<0) temp
-= 9*stride
;
1370 else temp
+= 9*stride
;
1372 ff_emulated_edge_mc(temp
, motion_source
, stride
, 9, 9, src_x
, src_y
, plane_width
, plane_height
);
1373 motion_source
= temp
;
1378 /* first, take care of copying a block from either the
1379 * previous or the golden frame */
1380 if (s
->all_fragments
[i
].coding_method
!= MODE_INTRA
) {
1381 /* Note, it is possible to implement all MC cases with
1382 put_no_rnd_pixels_l2 which would look more like the
1383 VP3 source but this would be slower as
1384 put_no_rnd_pixels_tab is better optimzed */
1385 if(motion_halfpel_index
!= 3){
1386 s
->dsp
.put_no_rnd_pixels_tab
[1][motion_halfpel_index
](
1387 output_plane
+ s
->all_fragments
[i
].first_pixel
,
1388 motion_source
, stride
, 8);
1390 int d
= (motion_x
^ motion_y
)>>31; // d is 0 if motion_x and _y have the same sign, else -1
1391 s
->dsp
.put_no_rnd_pixels_l2
[1](
1392 output_plane
+ s
->all_fragments
[i
].first_pixel
,
1394 motion_source
+ stride
+ 1 + d
,
1397 dequantizer
= s
->qmat
[1][plane
];
1399 dequantizer
= s
->qmat
[0][plane
];
1402 /* dequantize the DCT coefficients */
1403 if(s
->avctx
->idct_algo
==FF_IDCT_VP3
){
1404 Coeff
*coeff
= s
->coeffs
+ i
;
1405 s
->dsp
.clear_block(block
);
1407 block
[coeff
->index
]= coeff
->coeff
* dequantizer
[coeff
->index
];
1411 Coeff
*coeff
= s
->coeffs
+ i
;
1412 s
->dsp
.clear_block(block
);
1414 block
[coeff
->index
]= (coeff
->coeff
* dequantizer
[coeff
->index
] + 2)>>2;
1419 /* invert DCT and place (or add) in final output */
1421 if (s
->all_fragments
[i
].coding_method
== MODE_INTRA
) {
1422 if(s
->avctx
->idct_algo
!=FF_IDCT_VP3
)
1425 output_plane
+ s
->all_fragments
[i
].first_pixel
,
1430 output_plane
+ s
->all_fragments
[i
].first_pixel
,
1436 /* copy directly from the previous frame */
1437 s
->dsp
.put_pixels_tab
[1][0](
1438 output_plane
+ s
->all_fragments
[i
].first_pixel
,
1439 last_plane
+ s
->all_fragments
[i
].first_pixel
,
1444 /* perform the left edge filter if:
1445 * - the fragment is not on the left column
1446 * - the fragment is coded in this frame
1447 * - the fragment is not coded in this frame but the left
1448 * fragment is coded in this frame (this is done instead
1449 * of a right edge filter when rendering the left fragment
1450 * since this fragment is not available yet) */
1452 ((s
->all_fragments
[i
].coding_method
!= MODE_COPY
) ||
1453 ((s
->all_fragments
[i
].coding_method
== MODE_COPY
) &&
1454 (s
->all_fragments
[i
- 1].coding_method
!= MODE_COPY
)) )) {
1456 output_plane
+ s
->all_fragments
[i
].first_pixel
+ 7*stride
,
1457 -stride
, s
->bounding_values_array
+ 127);
1460 /* perform the top edge filter if:
1461 * - the fragment is not on the top row
1462 * - the fragment is coded in this frame
1463 * - the fragment is not coded in this frame but the above
1464 * fragment is coded in this frame (this is done instead
1465 * of a bottom edge filter when rendering the above
1466 * fragment since this fragment is not available yet) */
1468 ((s
->all_fragments
[i
].coding_method
!= MODE_COPY
) ||
1469 ((s
->all_fragments
[i
].coding_method
== MODE_COPY
) &&
1470 (s
->all_fragments
[i
- fragment_width
].coding_method
!= MODE_COPY
)) )) {
1472 output_plane
+ s
->all_fragments
[i
].first_pixel
- stride
,
1473 -stride
, s
->bounding_values_array
+ 127);
1480 /* this looks like a good place for slice dispatch... */
1482 * if (slice == s->macroblock_height - 1)
1483 * dispatch (both last slice & 2nd-to-last slice);
1484 * else if (slice > 0)
1485 * dispatch (slice - 1);
1491 static void apply_loop_filter(Vp3DecodeContext
*s
)
1495 int *bounding_values
= s
->bounding_values_array
+127;
1498 int bounding_values_array
[256];
1501 /* find the right loop limit value */
1502 for (x
= 63; x
>= 0; x
--) {
1503 if (vp31_ac_scale_factor
[x
] >= s
->quality_index
)
1506 filter_limit
= vp31_filter_limit_values
[s
->quality_index
];
1508 /* set up the bounding values */
1509 memset(bounding_values_array
, 0, 256 * sizeof(int));
1510 for (x
= 0; x
< filter_limit
; x
++) {
1511 bounding_values
[-x
- filter_limit
] = -filter_limit
+ x
;
1512 bounding_values
[-x
] = -x
;
1513 bounding_values
[x
] = x
;
1514 bounding_values
[x
+ filter_limit
] = filter_limit
- x
;
1518 for (plane
= 0; plane
< 3; plane
++) {
1519 int width
= s
->fragment_width
>> !!plane
;
1520 int height
= s
->fragment_height
>> !!plane
;
1521 int fragment
= s
->fragment_start
[plane
];
1522 int stride
= s
->current_frame
.linesize
[plane
];
1523 uint8_t *plane_data
= s
->current_frame
.data
[plane
];
1524 if (!s
->flipped_image
) stride
= -stride
;
1526 for (y
= 0; y
< height
; y
++) {
1528 for (x
= 0; x
< width
; x
++) {
1529 /* do not perform left edge filter for left columns frags */
1531 (s
->all_fragments
[fragment
].coding_method
!= MODE_COPY
)) {
1532 s
->dsp
.vp3_h_loop_filter(
1533 plane_data
+ s
->all_fragments
[fragment
].first_pixel
,
1534 stride
, bounding_values
);
1537 /* do not perform top edge filter for top row fragments */
1539 (s
->all_fragments
[fragment
].coding_method
!= MODE_COPY
)) {
1540 s
->dsp
.vp3_v_loop_filter(
1541 plane_data
+ s
->all_fragments
[fragment
].first_pixel
,
1542 stride
, bounding_values
);
1545 /* do not perform right edge filter for right column
1546 * fragments or if right fragment neighbor is also coded
1547 * in this frame (it will be filtered in next iteration) */
1548 if ((x
< width
- 1) &&
1549 (s
->all_fragments
[fragment
].coding_method
!= MODE_COPY
) &&
1550 (s
->all_fragments
[fragment
+ 1].coding_method
== MODE_COPY
)) {
1551 s
->dsp
.vp3_h_loop_filter(
1552 plane_data
+ s
->all_fragments
[fragment
+ 1].first_pixel
,
1553 stride
, bounding_values
);
1556 /* do not perform bottom edge filter for bottom row
1557 * fragments or if bottom fragment neighbor is also coded
1558 * in this frame (it will be filtered in the next row) */
1559 if ((y
< height
- 1) &&
1560 (s
->all_fragments
[fragment
].coding_method
!= MODE_COPY
) &&
1561 (s
->all_fragments
[fragment
+ width
].coding_method
== MODE_COPY
)) {
1562 s
->dsp
.vp3_v_loop_filter(
1563 plane_data
+ s
->all_fragments
[fragment
+ width
].first_pixel
,
1564 stride
, bounding_values
);
1574 * This function computes the first pixel addresses for each fragment.
1575 * This function needs to be invoked after the first frame is allocated
1576 * so that it has access to the plane strides.
1578 static void vp3_calculate_pixel_addresses(Vp3DecodeContext
*s
)
1580 #define Y_INITIAL(chroma_shift) s->flipped_image ? 1 : s->fragment_height >> chroma_shift
1581 #define Y_FINISHED(chroma_shift) s->flipped_image ? y <= s->fragment_height >> chroma_shift : y > 0
1584 const int y_inc
= s
->flipped_image
? 1 : -1;
1586 /* figure out the first pixel addresses for each of the fragments */
1589 for (y
= Y_INITIAL(0); Y_FINISHED(0); y
+= y_inc
) {
1590 for (x
= 0; x
< s
->fragment_width
; x
++) {
1591 s
->all_fragments
[i
++].first_pixel
=
1592 s
->golden_frame
.linesize
[0] * y
* FRAGMENT_PIXELS
-
1593 s
->golden_frame
.linesize
[0] +
1594 x
* FRAGMENT_PIXELS
;
1599 i
= s
->fragment_start
[1];
1600 for (y
= Y_INITIAL(1); Y_FINISHED(1); y
+= y_inc
) {
1601 for (x
= 0; x
< s
->fragment_width
/ 2; x
++) {
1602 s
->all_fragments
[i
++].first_pixel
=
1603 s
->golden_frame
.linesize
[1] * y
* FRAGMENT_PIXELS
-
1604 s
->golden_frame
.linesize
[1] +
1605 x
* FRAGMENT_PIXELS
;
1610 i
= s
->fragment_start
[2];
1611 for (y
= Y_INITIAL(1); Y_FINISHED(1); y
+= y_inc
) {
1612 for (x
= 0; x
< s
->fragment_width
/ 2; x
++) {
1613 s
->all_fragments
[i
++].first_pixel
=
1614 s
->golden_frame
.linesize
[2] * y
* FRAGMENT_PIXELS
-
1615 s
->golden_frame
.linesize
[2] +
1616 x
* FRAGMENT_PIXELS
;
1622 * This is the ffmpeg/libavcodec API init function.
1624 static av_cold
int vp3_decode_init(AVCodecContext
*avctx
)
1626 Vp3DecodeContext
*s
= avctx
->priv_data
;
1627 int i
, inter
, plane
;
1630 int y_superblock_count
;
1631 int c_superblock_count
;
1633 if (avctx
->codec_tag
== MKTAG('V','P','3','0'))
1639 s
->width
= (avctx
->width
+ 15) & 0xFFFFFFF0;
1640 s
->height
= (avctx
->height
+ 15) & 0xFFFFFFF0;
1641 avctx
->pix_fmt
= PIX_FMT_YUV420P
;
1642 if(avctx
->idct_algo
==FF_IDCT_AUTO
)
1643 avctx
->idct_algo
=FF_IDCT_VP3
;
1644 dsputil_init(&s
->dsp
, avctx
);
1646 ff_init_scantable(s
->dsp
.idct_permutation
, &s
->scantable
, ff_zigzag_direct
);
1648 /* initialize to an impossible value which will force a recalculation
1649 * in the first frame decode */
1650 s
->quality_index
= -1;
1652 s
->y_superblock_width
= (s
->width
+ 31) / 32;
1653 s
->y_superblock_height
= (s
->height
+ 31) / 32;
1654 y_superblock_count
= s
->y_superblock_width
* s
->y_superblock_height
;
1656 /* work out the dimensions for the C planes */
1657 c_width
= s
->width
/ 2;
1658 c_height
= s
->height
/ 2;
1659 s
->c_superblock_width
= (c_width
+ 31) / 32;
1660 s
->c_superblock_height
= (c_height
+ 31) / 32;
1661 c_superblock_count
= s
->c_superblock_width
* s
->c_superblock_height
;
1663 s
->superblock_count
= y_superblock_count
+ (c_superblock_count
* 2);
1664 s
->u_superblock_start
= y_superblock_count
;
1665 s
->v_superblock_start
= s
->u_superblock_start
+ c_superblock_count
;
1666 s
->superblock_coding
= av_malloc(s
->superblock_count
);
1668 s
->macroblock_width
= (s
->width
+ 15) / 16;
1669 s
->macroblock_height
= (s
->height
+ 15) / 16;
1670 s
->macroblock_count
= s
->macroblock_width
* s
->macroblock_height
;
1672 s
->fragment_width
= s
->width
/ FRAGMENT_PIXELS
;
1673 s
->fragment_height
= s
->height
/ FRAGMENT_PIXELS
;
1675 /* fragment count covers all 8x8 blocks for all 3 planes */
1676 s
->fragment_count
= s
->fragment_width
* s
->fragment_height
* 3 / 2;
1677 s
->fragment_start
[1] = s
->fragment_width
* s
->fragment_height
;
1678 s
->fragment_start
[2] = s
->fragment_width
* s
->fragment_height
* 5 / 4;
1680 s
->all_fragments
= av_malloc(s
->fragment_count
* sizeof(Vp3Fragment
));
1681 s
->coeff_counts
= av_malloc(s
->fragment_count
* sizeof(*s
->coeff_counts
));
1682 s
->coeffs
= av_malloc(s
->fragment_count
* sizeof(Coeff
) * 65);
1683 s
->coded_fragment_list
= av_malloc(s
->fragment_count
* sizeof(int));
1684 s
->pixel_addresses_initialized
= 0;
1686 if (!s
->theora_tables
)
1688 for (i
= 0; i
< 64; i
++) {
1689 s
->coded_dc_scale_factor
[i
] = vp31_dc_scale_factor
[i
];
1690 s
->coded_ac_scale_factor
[i
] = vp31_ac_scale_factor
[i
];
1691 s
->base_matrix
[0][i
] = vp31_intra_y_dequant
[i
];
1692 s
->base_matrix
[1][i
] = vp31_intra_c_dequant
[i
];
1693 s
->base_matrix
[2][i
] = vp31_inter_dequant
[i
];
1694 s
->filter_limit_values
[i
] = vp31_filter_limit_values
[i
];
1697 for(inter
=0; inter
<2; inter
++){
1698 for(plane
=0; plane
<3; plane
++){
1699 s
->qr_count
[inter
][plane
]= 1;
1700 s
->qr_size
[inter
][plane
][0]= 63;
1701 s
->qr_base
[inter
][plane
][0]=
1702 s
->qr_base
[inter
][plane
][1]= 2*inter
+ (!!plane
)*!inter
;
1706 /* init VLC tables */
1707 for (i
= 0; i
< 16; i
++) {
1710 init_vlc(&s
->dc_vlc
[i
], 5, 32,
1711 &dc_bias
[i
][0][1], 4, 2,
1712 &dc_bias
[i
][0][0], 4, 2, 0);
1714 /* group 1 AC histograms */
1715 init_vlc(&s
->ac_vlc_1
[i
], 5, 32,
1716 &ac_bias_0
[i
][0][1], 4, 2,
1717 &ac_bias_0
[i
][0][0], 4, 2, 0);
1719 /* group 2 AC histograms */
1720 init_vlc(&s
->ac_vlc_2
[i
], 5, 32,
1721 &ac_bias_1
[i
][0][1], 4, 2,
1722 &ac_bias_1
[i
][0][0], 4, 2, 0);
1724 /* group 3 AC histograms */
1725 init_vlc(&s
->ac_vlc_3
[i
], 5, 32,
1726 &ac_bias_2
[i
][0][1], 4, 2,
1727 &ac_bias_2
[i
][0][0], 4, 2, 0);
1729 /* group 4 AC histograms */
1730 init_vlc(&s
->ac_vlc_4
[i
], 5, 32,
1731 &ac_bias_3
[i
][0][1], 4, 2,
1732 &ac_bias_3
[i
][0][0], 4, 2, 0);
1735 for (i
= 0; i
< 16; i
++) {
1738 init_vlc(&s
->dc_vlc
[i
], 5, 32,
1739 &s
->huffman_table
[i
][0][1], 4, 2,
1740 &s
->huffman_table
[i
][0][0], 4, 2, 0);
1742 /* group 1 AC histograms */
1743 init_vlc(&s
->ac_vlc_1
[i
], 5, 32,
1744 &s
->huffman_table
[i
+16][0][1], 4, 2,
1745 &s
->huffman_table
[i
+16][0][0], 4, 2, 0);
1747 /* group 2 AC histograms */
1748 init_vlc(&s
->ac_vlc_2
[i
], 5, 32,
1749 &s
->huffman_table
[i
+16*2][0][1], 4, 2,
1750 &s
->huffman_table
[i
+16*2][0][0], 4, 2, 0);
1752 /* group 3 AC histograms */
1753 init_vlc(&s
->ac_vlc_3
[i
], 5, 32,
1754 &s
->huffman_table
[i
+16*3][0][1], 4, 2,
1755 &s
->huffman_table
[i
+16*3][0][0], 4, 2, 0);
1757 /* group 4 AC histograms */
1758 init_vlc(&s
->ac_vlc_4
[i
], 5, 32,
1759 &s
->huffman_table
[i
+16*4][0][1], 4, 2,
1760 &s
->huffman_table
[i
+16*4][0][0], 4, 2, 0);
1764 init_vlc(&s
->superblock_run_length_vlc
, 6, 34,
1765 &superblock_run_length_vlc_table
[0][1], 4, 2,
1766 &superblock_run_length_vlc_table
[0][0], 4, 2, 0);
1768 init_vlc(&s
->fragment_run_length_vlc
, 5, 30,
1769 &fragment_run_length_vlc_table
[0][1], 4, 2,
1770 &fragment_run_length_vlc_table
[0][0], 4, 2, 0);
1772 init_vlc(&s
->mode_code_vlc
, 3, 8,
1773 &mode_code_vlc_table
[0][1], 2, 1,
1774 &mode_code_vlc_table
[0][0], 2, 1, 0);
1776 init_vlc(&s
->motion_vector_vlc
, 6, 63,
1777 &motion_vector_vlc_table
[0][1], 2, 1,
1778 &motion_vector_vlc_table
[0][0], 2, 1, 0);
1780 /* work out the block mapping tables */
1781 s
->superblock_fragments
= av_malloc(s
->superblock_count
* 16 * sizeof(int));
1782 s
->superblock_macroblocks
= av_malloc(s
->superblock_count
* 4 * sizeof(int));
1783 s
->macroblock_fragments
= av_malloc(s
->macroblock_count
* 6 * sizeof(int));
1784 s
->macroblock_coding
= av_malloc(s
->macroblock_count
+ 1);
1785 init_block_mapping(s
);
1787 for (i
= 0; i
< 3; i
++) {
1788 s
->current_frame
.data
[i
] = NULL
;
1789 s
->last_frame
.data
[i
] = NULL
;
1790 s
->golden_frame
.data
[i
] = NULL
;
1797 * This is the ffmpeg/libavcodec API frame decode function.
1799 static int vp3_decode_frame(AVCodecContext
*avctx
,
1800 void *data
, int *data_size
,
1801 const uint8_t *buf
, int buf_size
)
1803 Vp3DecodeContext
*s
= avctx
->priv_data
;
1805 static int counter
= 0;
1808 init_get_bits(&gb
, buf
, buf_size
* 8);
1810 if (s
->theora
&& get_bits1(&gb
))
1812 av_log(avctx
, AV_LOG_ERROR
, "Header packet passed to frame decoder, skipping\n");
1816 s
->keyframe
= !get_bits1(&gb
);
1819 s
->last_quality_index
= s
->quality_index
;
1823 s
->qis
[s
->nqis
++]= get_bits(&gb
, 6);
1824 } while(s
->theora
>= 0x030200 && s
->nqis
<3 && get_bits1(&gb
));
1826 s
->quality_index
= s
->qis
[0];
1828 if (s
->avctx
->debug
& FF_DEBUG_PICT_INFO
)
1829 av_log(s
->avctx
, AV_LOG_INFO
, " VP3 %sframe #%d: Q index = %d\n",
1830 s
->keyframe
?"key":"", counter
, s
->quality_index
);
1833 if (s
->quality_index
!= s
->last_quality_index
) {
1834 init_dequantizer(s
);
1835 init_loop_filter(s
);
1838 if (avctx
->skip_frame
>= AVDISCARD_NONKEY
&& !s
->keyframe
)
1844 skip_bits(&gb
, 4); /* width code */
1845 skip_bits(&gb
, 4); /* height code */
1848 s
->version
= get_bits(&gb
, 5);
1850 av_log(s
->avctx
, AV_LOG_DEBUG
, "VP version: %d\n", s
->version
);
1853 if (s
->version
|| s
->theora
)
1856 av_log(s
->avctx
, AV_LOG_ERROR
, "Warning, unsupported keyframe coding type?!\n");
1857 skip_bits(&gb
, 2); /* reserved? */
1860 if (s
->last_frame
.data
[0] == s
->golden_frame
.data
[0]) {
1861 if (s
->golden_frame
.data
[0])
1862 avctx
->release_buffer(avctx
, &s
->golden_frame
);
1863 s
->last_frame
= s
->golden_frame
; /* ensure that we catch any access to this released frame */
1865 if (s
->golden_frame
.data
[0])
1866 avctx
->release_buffer(avctx
, &s
->golden_frame
);
1867 if (s
->last_frame
.data
[0])
1868 avctx
->release_buffer(avctx
, &s
->last_frame
);
1871 s
->golden_frame
.reference
= 3;
1872 if(avctx
->get_buffer(avctx
, &s
->golden_frame
) < 0) {
1873 av_log(s
->avctx
, AV_LOG_ERROR
, "vp3: get_buffer() failed\n");
1877 /* golden frame is also the current frame */
1878 s
->current_frame
= s
->golden_frame
;
1880 /* time to figure out pixel addresses? */
1881 if (!s
->pixel_addresses_initialized
)
1883 vp3_calculate_pixel_addresses(s
);
1884 s
->pixel_addresses_initialized
= 1;
1887 /* allocate a new current frame */
1888 s
->current_frame
.reference
= 3;
1889 if (!s
->pixel_addresses_initialized
) {
1890 av_log(s
->avctx
, AV_LOG_ERROR
, "vp3: first frame not a keyframe\n");
1893 if(avctx
->get_buffer(avctx
, &s
->current_frame
) < 0) {
1894 av_log(s
->avctx
, AV_LOG_ERROR
, "vp3: get_buffer() failed\n");
1899 s
->current_frame
.qscale_table
= s
->qscale_table
; //FIXME allocate individual tables per AVFrame
1900 s
->current_frame
.qstride
= 0;
1904 if (unpack_superblocks(s
, &gb
)){
1905 av_log(s
->avctx
, AV_LOG_ERROR
, "error in unpack_superblocks\n");
1908 if (unpack_modes(s
, &gb
)){
1909 av_log(s
->avctx
, AV_LOG_ERROR
, "error in unpack_modes\n");
1912 if (unpack_vectors(s
, &gb
)){
1913 av_log(s
->avctx
, AV_LOG_ERROR
, "error in unpack_vectors\n");
1916 if (unpack_dct_coeffs(s
, &gb
)){
1917 av_log(s
->avctx
, AV_LOG_ERROR
, "error in unpack_dct_coeffs\n");
1921 reverse_dc_prediction(s
, 0, s
->fragment_width
, s
->fragment_height
);
1922 if ((avctx
->flags
& CODEC_FLAG_GRAY
) == 0) {
1923 reverse_dc_prediction(s
, s
->fragment_start
[1],
1924 s
->fragment_width
/ 2, s
->fragment_height
/ 2);
1925 reverse_dc_prediction(s
, s
->fragment_start
[2],
1926 s
->fragment_width
/ 2, s
->fragment_height
/ 2);
1929 for (i
= 0; i
< s
->macroblock_height
; i
++)
1932 apply_loop_filter(s
);
1934 *data_size
=sizeof(AVFrame
);
1935 *(AVFrame
*)data
= s
->current_frame
;
1937 /* release the last frame, if it is allocated and if it is not the
1939 if ((s
->last_frame
.data
[0]) &&
1940 (s
->last_frame
.data
[0] != s
->golden_frame
.data
[0]))
1941 avctx
->release_buffer(avctx
, &s
->last_frame
);
1943 /* shuffle frames (last = current) */
1944 s
->last_frame
= s
->current_frame
;
1945 s
->current_frame
.data
[0]= NULL
; /* ensure that we catch any access to this released frame */
1951 * This is the ffmpeg/libavcodec API module cleanup function.
1953 static av_cold
int vp3_decode_end(AVCodecContext
*avctx
)
1955 Vp3DecodeContext
*s
= avctx
->priv_data
;
1958 av_free(s
->superblock_coding
);
1959 av_free(s
->all_fragments
);
1960 av_free(s
->coeff_counts
);
1962 av_free(s
->coded_fragment_list
);
1963 av_free(s
->superblock_fragments
);
1964 av_free(s
->superblock_macroblocks
);
1965 av_free(s
->macroblock_fragments
);
1966 av_free(s
->macroblock_coding
);
1968 for (i
= 0; i
< 16; i
++) {
1969 free_vlc(&s
->dc_vlc
[i
]);
1970 free_vlc(&s
->ac_vlc_1
[i
]);
1971 free_vlc(&s
->ac_vlc_2
[i
]);
1972 free_vlc(&s
->ac_vlc_3
[i
]);
1973 free_vlc(&s
->ac_vlc_4
[i
]);
1976 free_vlc(&s
->superblock_run_length_vlc
);
1977 free_vlc(&s
->fragment_run_length_vlc
);
1978 free_vlc(&s
->mode_code_vlc
);
1979 free_vlc(&s
->motion_vector_vlc
);
1981 /* release all frames */
1982 if (s
->golden_frame
.data
[0] && s
->golden_frame
.data
[0] != s
->last_frame
.data
[0])
1983 avctx
->release_buffer(avctx
, &s
->golden_frame
);
1984 if (s
->last_frame
.data
[0])
1985 avctx
->release_buffer(avctx
, &s
->last_frame
);
1986 /* no need to release the current_frame since it will always be pointing
1987 * to the same frame as either the golden or last frame */
1992 static int read_huffman_tree(AVCodecContext
*avctx
, GetBitContext
*gb
)
1994 Vp3DecodeContext
*s
= avctx
->priv_data
;
1996 if (get_bits1(gb
)) {
1998 if (s
->entries
>= 32) { /* overflow */
1999 av_log(avctx
, AV_LOG_ERROR
, "huffman tree overflow\n");
2002 token
= get_bits(gb
, 5);
2003 //av_log(avctx, AV_LOG_DEBUG, "hti %d hbits %x token %d entry : %d size %d\n", s->hti, s->hbits, token, s->entries, s->huff_code_size);
2004 s
->huffman_table
[s
->hti
][token
][0] = s
->hbits
;
2005 s
->huffman_table
[s
->hti
][token
][1] = s
->huff_code_size
;
2009 if (s
->huff_code_size
>= 32) {/* overflow */
2010 av_log(avctx
, AV_LOG_ERROR
, "huffman tree overflow\n");
2013 s
->huff_code_size
++;
2015 read_huffman_tree(avctx
, gb
);
2017 read_huffman_tree(avctx
, gb
);
2019 s
->huff_code_size
--;
2024 #ifdef CONFIG_THEORA_DECODER
2025 static int theora_decode_header(AVCodecContext
*avctx
, GetBitContext
*gb
)
2027 Vp3DecodeContext
*s
= avctx
->priv_data
;
2028 int visible_width
, visible_height
;
2030 s
->theora
= get_bits_long(gb
, 24);
2031 av_log(avctx
, AV_LOG_DEBUG
, "Theora bitstream version %X\n", s
->theora
);
2033 /* 3.2.0 aka alpha3 has the same frame orientation as original vp3 */
2034 /* but previous versions have the image flipped relative to vp3 */
2035 if (s
->theora
< 0x030200)
2037 s
->flipped_image
= 1;
2038 av_log(avctx
, AV_LOG_DEBUG
, "Old (<alpha3) Theora bitstream, flipped image\n");
2041 visible_width
= s
->width
= get_bits(gb
, 16) << 4;
2042 visible_height
= s
->height
= get_bits(gb
, 16) << 4;
2044 if(avcodec_check_dimensions(avctx
, s
->width
, s
->height
)){
2045 av_log(avctx
, AV_LOG_ERROR
, "Invalid dimensions (%dx%d)\n", s
->width
, s
->height
);
2046 s
->width
= s
->height
= 0;
2050 if (s
->theora
>= 0x030400)
2052 skip_bits(gb
, 32); /* total number of superblocks in a frame */
2053 // fixme, the next field is 36bits long
2054 skip_bits(gb
, 32); /* total number of blocks in a frame */
2055 skip_bits(gb
, 4); /* total number of blocks in a frame */
2056 skip_bits(gb
, 32); /* total number of macroblocks in a frame */
2059 if (s
->theora
>= 0x030200) {
2060 visible_width
= get_bits_long(gb
, 24);
2061 visible_height
= get_bits_long(gb
, 24);
2063 skip_bits(gb
, 8); /* offset x */
2064 skip_bits(gb
, 8); /* offset y */
2067 skip_bits(gb
, 32); /* fps numerator */
2068 skip_bits(gb
, 32); /* fps denumerator */
2069 skip_bits(gb
, 24); /* aspect numerator */
2070 skip_bits(gb
, 24); /* aspect denumerator */
2072 if (s
->theora
< 0x030200)
2073 skip_bits(gb
, 5); /* keyframe frequency force */
2074 skip_bits(gb
, 8); /* colorspace */
2075 if (s
->theora
>= 0x030400)
2076 skip_bits(gb
, 2); /* pixel format: 420,res,422,444 */
2077 skip_bits(gb
, 24); /* bitrate */
2079 skip_bits(gb
, 6); /* quality hint */
2081 if (s
->theora
>= 0x030200)
2083 skip_bits(gb
, 5); /* keyframe frequency force */
2085 if (s
->theora
< 0x030400)
2086 skip_bits(gb
, 5); /* spare bits */
2089 // align_get_bits(gb);
2091 if ( visible_width
<= s
->width
&& visible_width
> s
->width
-16
2092 && visible_height
<= s
->height
&& visible_height
> s
->height
-16)
2093 avcodec_set_dimensions(avctx
, visible_width
, visible_height
);
2095 avcodec_set_dimensions(avctx
, s
->width
, s
->height
);
2100 static int theora_decode_tables(AVCodecContext
*avctx
, GetBitContext
*gb
)
2102 Vp3DecodeContext
*s
= avctx
->priv_data
;
2103 int i
, n
, matrices
, inter
, plane
;
2105 if (s
->theora
>= 0x030200) {
2106 n
= get_bits(gb
, 3);
2107 /* loop filter limit values table */
2108 for (i
= 0; i
< 64; i
++)
2109 s
->filter_limit_values
[i
] = get_bits(gb
, n
);
2112 if (s
->theora
>= 0x030200)
2113 n
= get_bits(gb
, 4) + 1;
2116 /* quality threshold table */
2117 for (i
= 0; i
< 64; i
++)
2118 s
->coded_ac_scale_factor
[i
] = get_bits(gb
, n
);
2120 if (s
->theora
>= 0x030200)
2121 n
= get_bits(gb
, 4) + 1;
2124 /* dc scale factor table */
2125 for (i
= 0; i
< 64; i
++)
2126 s
->coded_dc_scale_factor
[i
] = get_bits(gb
, n
);
2128 if (s
->theora
>= 0x030200)
2129 matrices
= get_bits(gb
, 9) + 1;
2134 av_log(avctx
, AV_LOG_ERROR
, "invalid number of base matrixes\n");
2138 for(n
=0; n
<matrices
; n
++){
2139 for (i
= 0; i
< 64; i
++)
2140 s
->base_matrix
[n
][i
]= get_bits(gb
, 8);
2143 for (inter
= 0; inter
<= 1; inter
++) {
2144 for (plane
= 0; plane
<= 2; plane
++) {
2146 if (inter
|| plane
> 0)
2147 newqr
= get_bits1(gb
);
2150 if(inter
&& get_bits1(gb
)){
2154 qtj
= (3*inter
+ plane
- 1) / 3;
2155 plj
= (plane
+ 2) % 3;
2157 s
->qr_count
[inter
][plane
]= s
->qr_count
[qtj
][plj
];
2158 memcpy(s
->qr_size
[inter
][plane
], s
->qr_size
[qtj
][plj
], sizeof(s
->qr_size
[0][0]));
2159 memcpy(s
->qr_base
[inter
][plane
], s
->qr_base
[qtj
][plj
], sizeof(s
->qr_base
[0][0]));
2165 i
= get_bits(gb
, av_log2(matrices
-1)+1);
2167 av_log(avctx
, AV_LOG_ERROR
, "invalid base matrix index\n");
2170 s
->qr_base
[inter
][plane
][qri
]= i
;
2173 i
= get_bits(gb
, av_log2(63-qi
)+1) + 1;
2174 s
->qr_size
[inter
][plane
][qri
++]= i
;
2179 av_log(avctx
, AV_LOG_ERROR
, "invalid qi %d > 63\n", qi
);
2182 s
->qr_count
[inter
][plane
]= qri
;
2187 /* Huffman tables */
2188 for (s
->hti
= 0; s
->hti
< 80; s
->hti
++) {
2190 s
->huff_code_size
= 1;
2191 if (!get_bits1(gb
)) {
2193 read_huffman_tree(avctx
, gb
);
2195 read_huffman_tree(avctx
, gb
);
2199 s
->theora_tables
= 1;
2204 static int theora_decode_init(AVCodecContext
*avctx
)
2206 Vp3DecodeContext
*s
= avctx
->priv_data
;
2209 uint8_t *header_start
[3];
2215 if (!avctx
->extradata_size
)
2217 av_log(avctx
, AV_LOG_ERROR
, "Missing extradata!\n");
2221 if (ff_split_xiph_headers(avctx
->extradata
, avctx
->extradata_size
,
2222 42, header_start
, header_len
) < 0) {
2223 av_log(avctx
, AV_LOG_ERROR
, "Corrupt extradata\n");
2228 init_get_bits(&gb
, header_start
[i
], header_len
[i
]);
2230 ptype
= get_bits(&gb
, 8);
2232 if (!(ptype
& 0x80))
2234 av_log(avctx
, AV_LOG_ERROR
, "Invalid extradata!\n");
2238 // FIXME: Check for this as well.
2239 skip_bits(&gb
, 6*8); /* "theora" */
2244 theora_decode_header(avctx
, &gb
);
2247 // FIXME: is this needed? it breaks sometimes
2248 // theora_decode_comments(avctx, gb);
2251 theora_decode_tables(avctx
, &gb
);
2254 av_log(avctx
, AV_LOG_ERROR
, "Unknown Theora config packet: %d\n", ptype
&~0x80);
2257 if(ptype
!= 0x81 && 8*header_len
[i
] != get_bits_count(&gb
))
2258 av_log(avctx
, AV_LOG_WARNING
, "%d bits left in packet %X\n", 8*header_len
[i
] - get_bits_count(&gb
), ptype
);
2259 if (s
->theora
< 0x030200)
2263 vp3_decode_init(avctx
);
2267 AVCodec theora_decoder
= {
2271 sizeof(Vp3DecodeContext
),
2278 .long_name
= NULL_IF_CONFIG_SMALL("Theora"),
2282 AVCodec vp3_decoder
= {
2286 sizeof(Vp3DecodeContext
),
2293 .long_name
= NULL_IF_CONFIG_SMALL("On2 VP3"),