e46e6a437aca5d02aea88c0ef0f50bac8067fbec
[libav.git] / libavcodec / vp3.c
1 /*
2 * Copyright (C) 2003-2004 the ffmpeg project
3 *
4 * This file is part of FFmpeg.
5 *
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.
10 *
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.
15 *
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
19 */
20
21 /**
22 * @file libavcodec/vp3.c
23 * On2 VP3 Video Decoder
24 *
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
28 *
29 * Theora decoder by Alex Beregszaszi
30 */
31
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35
36 #include "avcodec.h"
37 #include "dsputil.h"
38 #include "get_bits.h"
39
40 #include "vp3data.h"
41 #include "xiph.h"
42
43 #define FRAGMENT_PIXELS 8
44
45 static av_cold int vp3_decode_end(AVCodecContext *avctx);
46
47 //FIXME split things out into their own arrays
48 typedef struct Vp3Fragment {
49 int16_t dc;
50 uint8_t coding_method;
51 uint8_t qpi;
52 } Vp3Fragment;
53
54 #define SB_NOT_CODED 0
55 #define SB_PARTIALLY_CODED 1
56 #define SB_FULLY_CODED 2
57
58 // This is the maximum length of a single long bit run that can be encoded
59 // for superblock coding or block qps. Theora special-cases this to read a
60 // bit instead of flipping the current bit to allow for runs longer than 4129.
61 #define MAXIMUM_LONG_BIT_RUN 4129
62
63 #define MODE_INTER_NO_MV 0
64 #define MODE_INTRA 1
65 #define MODE_INTER_PLUS_MV 2
66 #define MODE_INTER_LAST_MV 3
67 #define MODE_INTER_PRIOR_LAST 4
68 #define MODE_USING_GOLDEN 5
69 #define MODE_GOLDEN_MV 6
70 #define MODE_INTER_FOURMV 7
71 #define CODING_MODE_COUNT 8
72
73 /* special internal mode */
74 #define MODE_COPY 8
75
76 /* There are 6 preset schemes, plus a free-form scheme */
77 static const int ModeAlphabet[6][CODING_MODE_COUNT] =
78 {
79 /* scheme 1: Last motion vector dominates */
80 { MODE_INTER_LAST_MV, MODE_INTER_PRIOR_LAST,
81 MODE_INTER_PLUS_MV, MODE_INTER_NO_MV,
82 MODE_INTRA, MODE_USING_GOLDEN,
83 MODE_GOLDEN_MV, MODE_INTER_FOURMV },
84
85 /* scheme 2 */
86 { MODE_INTER_LAST_MV, MODE_INTER_PRIOR_LAST,
87 MODE_INTER_NO_MV, MODE_INTER_PLUS_MV,
88 MODE_INTRA, MODE_USING_GOLDEN,
89 MODE_GOLDEN_MV, MODE_INTER_FOURMV },
90
91 /* scheme 3 */
92 { MODE_INTER_LAST_MV, MODE_INTER_PLUS_MV,
93 MODE_INTER_PRIOR_LAST, MODE_INTER_NO_MV,
94 MODE_INTRA, MODE_USING_GOLDEN,
95 MODE_GOLDEN_MV, MODE_INTER_FOURMV },
96
97 /* scheme 4 */
98 { MODE_INTER_LAST_MV, MODE_INTER_PLUS_MV,
99 MODE_INTER_NO_MV, MODE_INTER_PRIOR_LAST,
100 MODE_INTRA, MODE_USING_GOLDEN,
101 MODE_GOLDEN_MV, MODE_INTER_FOURMV },
102
103 /* scheme 5: No motion vector dominates */
104 { MODE_INTER_NO_MV, MODE_INTER_LAST_MV,
105 MODE_INTER_PRIOR_LAST, MODE_INTER_PLUS_MV,
106 MODE_INTRA, MODE_USING_GOLDEN,
107 MODE_GOLDEN_MV, MODE_INTER_FOURMV },
108
109 /* scheme 6 */
110 { MODE_INTER_NO_MV, MODE_USING_GOLDEN,
111 MODE_INTER_LAST_MV, MODE_INTER_PRIOR_LAST,
112 MODE_INTER_PLUS_MV, MODE_INTRA,
113 MODE_GOLDEN_MV, MODE_INTER_FOURMV },
114
115 };
116
117 static const uint8_t hilbert_offset[16][2] = {
118 {0,0}, {1,0}, {1,1}, {0,1},
119 {0,2}, {0,3}, {1,3}, {1,2},
120 {2,2}, {2,3}, {3,3}, {3,2},
121 {3,1}, {2,1}, {2,0}, {3,0}
122 };
123
124 #define MIN_DEQUANT_VAL 2
125
126 typedef struct Vp3DecodeContext {
127 AVCodecContext *avctx;
128 int theora, theora_tables;
129 int version;
130 int width, height;
131 int chroma_x_shift, chroma_y_shift;
132 AVFrame golden_frame;
133 AVFrame last_frame;
134 AVFrame current_frame;
135 int keyframe;
136 DSPContext dsp;
137 int flipped_image;
138 int last_slice_end;
139
140 int qps[3];
141 int nqps;
142 int last_qps[3];
143
144 int superblock_count;
145 int y_superblock_width;
146 int y_superblock_height;
147 int y_superblock_count;
148 int c_superblock_width;
149 int c_superblock_height;
150 int c_superblock_count;
151 int u_superblock_start;
152 int v_superblock_start;
153 unsigned char *superblock_coding;
154
155 int macroblock_count;
156 int macroblock_width;
157 int macroblock_height;
158
159 int fragment_count;
160 int fragment_width[2];
161 int fragment_height[2];
162
163 Vp3Fragment *all_fragments;
164 int fragment_start[3];
165 int data_offset[3];
166
167 int8_t (*motion_val[2])[2];
168
169 ScanTable scantable;
170
171 /* tables */
172 uint16_t coded_dc_scale_factor[64];
173 uint32_t coded_ac_scale_factor[64];
174 uint8_t base_matrix[384][64];
175 uint8_t qr_count[2][3];
176 uint8_t qr_size [2][3][64];
177 uint16_t qr_base[2][3][64];
178
179 /**
180 * This is a list of all tokens in bitstream order. Reordering takes place
181 * by pulling from each level during IDCT. As a consequence, IDCT must be
182 * in Hilbert order, making the minimum slice height 64 for 4:2:0 and 32
183 * otherwise. The 32 different tokens with up to 12 bits of extradata are
184 * collapsed into 3 types, packed as follows:
185 * (from the low to high bits)
186 *
187 * 2 bits: type (0,1,2)
188 * 0: EOB run, 14 bits for run length (12 needed)
189 * 1: zero run, 7 bits for run length
190 * 7 bits for the next coefficient (3 needed)
191 * 2: coefficient, 14 bits (11 needed)
192 *
193 * Coefficients are signed, so are packed in the highest bits for automatic
194 * sign extension.
195 */
196 int16_t *dct_tokens[3][64];
197 int16_t *dct_tokens_base;
198 #define TOKEN_EOB(eob_run) ((eob_run) << 2)
199 #define TOKEN_ZERO_RUN(coeff, zero_run) (((coeff) << 9) + ((zero_run) << 2) + 1)
200 #define TOKEN_COEFF(coeff) (((coeff) << 2) + 2)
201
202 /**
203 * number of blocks that contain DCT coefficients at the given level or higher
204 */
205 int num_coded_frags[3][64];
206 int total_num_coded_frags;
207
208 /* this is a list of indexes into the all_fragments array indicating
209 * which of the fragments are coded */
210 int *coded_fragment_list[3];
211
212 VLC dc_vlc[16];
213 VLC ac_vlc_1[16];
214 VLC ac_vlc_2[16];
215 VLC ac_vlc_3[16];
216 VLC ac_vlc_4[16];
217
218 VLC superblock_run_length_vlc;
219 VLC fragment_run_length_vlc;
220 VLC mode_code_vlc;
221 VLC motion_vector_vlc;
222
223 /* these arrays need to be on 16-byte boundaries since SSE2 operations
224 * index into them */
225 DECLARE_ALIGNED(16, int16_t, qmat)[3][2][3][64]; //<qmat[qpi][is_inter][plane]
226
227 /* This table contains superblock_count * 16 entries. Each set of 16
228 * numbers corresponds to the fragment indexes 0..15 of the superblock.
229 * An entry will be -1 to indicate that no entry corresponds to that
230 * index. */
231 int *superblock_fragments;
232
233 /* This is an array that indicates how a particular macroblock
234 * is coded. */
235 unsigned char *macroblock_coding;
236
237 uint8_t edge_emu_buffer[9*2048]; //FIXME dynamic alloc
238 int8_t qscale_table[2048]; //FIXME dynamic alloc (width+15)/16
239
240 /* Huffman decode */
241 int hti;
242 unsigned int hbits;
243 int entries;
244 int huff_code_size;
245 uint16_t huffman_table[80][32][2];
246
247 uint8_t filter_limit_values[64];
248 DECLARE_ALIGNED(8, int, bounding_values_array)[256+2];
249 } Vp3DecodeContext;
250
251 /************************************************************************
252 * VP3 specific functions
253 ************************************************************************/
254
255 /*
256 * This function sets up all of the various blocks mappings:
257 * superblocks <-> fragments, macroblocks <-> fragments,
258 * superblocks <-> macroblocks
259 *
260 * Returns 0 is successful; returns 1 if *anything* went wrong.
261 */
262 static int init_block_mapping(Vp3DecodeContext *s)
263 {
264 int sb_x, sb_y, plane;
265 int x, y, i, j = 0;
266
267 for (plane = 0; plane < 3; plane++) {
268 int sb_width = plane ? s->c_superblock_width : s->y_superblock_width;
269 int sb_height = plane ? s->c_superblock_height : s->y_superblock_height;
270 int frag_width = s->fragment_width[!!plane];
271 int frag_height = s->fragment_height[!!plane];
272
273 for (sb_y = 0; sb_y < sb_height; sb_y++)
274 for (sb_x = 0; sb_x < sb_width; sb_x++)
275 for (i = 0; i < 16; i++) {
276 x = 4*sb_x + hilbert_offset[i][0];
277 y = 4*sb_y + hilbert_offset[i][1];
278
279 if (x < frag_width && y < frag_height)
280 s->superblock_fragments[j++] = s->fragment_start[plane] + y*frag_width + x;
281 else
282 s->superblock_fragments[j++] = -1;
283 }
284 }
285
286 return 0; /* successful path out */
287 }
288
289 /*
290 * This function sets up the dequantization tables used for a particular
291 * frame.
292 */
293 static void init_dequantizer(Vp3DecodeContext *s, int qpi)
294 {
295 int ac_scale_factor = s->coded_ac_scale_factor[s->qps[qpi]];
296 int dc_scale_factor = s->coded_dc_scale_factor[s->qps[qpi]];
297 int i, plane, inter, qri, bmi, bmj, qistart;
298
299 for(inter=0; inter<2; inter++){
300 for(plane=0; plane<3; plane++){
301 int sum=0;
302 for(qri=0; qri<s->qr_count[inter][plane]; qri++){
303 sum+= s->qr_size[inter][plane][qri];
304 if(s->qps[qpi] <= sum)
305 break;
306 }
307 qistart= sum - s->qr_size[inter][plane][qri];
308 bmi= s->qr_base[inter][plane][qri ];
309 bmj= s->qr_base[inter][plane][qri+1];
310 for(i=0; i<64; i++){
311 int coeff= ( 2*(sum -s->qps[qpi])*s->base_matrix[bmi][i]
312 - 2*(qistart-s->qps[qpi])*s->base_matrix[bmj][i]
313 + s->qr_size[inter][plane][qri])
314 / (2*s->qr_size[inter][plane][qri]);
315
316 int qmin= 8<<(inter + !i);
317 int qscale= i ? ac_scale_factor : dc_scale_factor;
318
319 s->qmat[qpi][inter][plane][s->dsp.idct_permutation[i]]= av_clip((qscale * coeff)/100 * 4, qmin, 4096);
320 }
321 // all DC coefficients use the same quant so as not to interfere with DC prediction
322 s->qmat[qpi][inter][plane][0] = s->qmat[0][inter][plane][0];
323 }
324 }
325
326 memset(s->qscale_table, (FFMAX(s->qmat[0][0][0][1], s->qmat[0][0][1][1])+8)/16, 512); //FIXME finetune
327 }
328
329 /*
330 * This function initializes the loop filter boundary limits if the frame's
331 * quality index is different from the previous frame's.
332 *
333 * The filter_limit_values may not be larger than 127.
334 */
335 static void init_loop_filter(Vp3DecodeContext *s)
336 {
337 int *bounding_values= s->bounding_values_array+127;
338 int filter_limit;
339 int x;
340 int value;
341
342 filter_limit = s->filter_limit_values[s->qps[0]];
343
344 /* set up the bounding values */
345 memset(s->bounding_values_array, 0, 256 * sizeof(int));
346 for (x = 0; x < filter_limit; x++) {
347 bounding_values[-x] = -x;
348 bounding_values[x] = x;
349 }
350 for (x = value = filter_limit; x < 128 && value; x++, value--) {
351 bounding_values[ x] = value;
352 bounding_values[-x] = -value;
353 }
354 if (value)
355 bounding_values[128] = value;
356 bounding_values[129] = bounding_values[130] = filter_limit * 0x02020202;
357 }
358
359 /*
360 * This function unpacks all of the superblock/macroblock/fragment coding
361 * information from the bitstream.
362 */
363 static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb)
364 {
365 int superblock_starts[3] = { 0, s->u_superblock_start, s->v_superblock_start };
366 int bit = 0;
367 int current_superblock = 0;
368 int current_run = 0;
369 int num_partial_superblocks = 0;
370
371 int i, j;
372 int current_fragment;
373 int plane;
374
375 if (s->keyframe) {
376 memset(s->superblock_coding, SB_FULLY_CODED, s->superblock_count);
377
378 } else {
379
380 /* unpack the list of partially-coded superblocks */
381 bit = get_bits1(gb);
382 while (current_superblock < s->superblock_count && get_bits_left(gb) > 0) {
383 current_run = get_vlc2(gb,
384 s->superblock_run_length_vlc.table, 6, 2) + 1;
385 if (current_run == 34)
386 current_run += get_bits(gb, 12);
387
388 if (current_superblock + current_run > s->superblock_count) {
389 av_log(s->avctx, AV_LOG_ERROR, "Invalid partially coded superblock run length\n");
390 return -1;
391 }
392
393 memset(s->superblock_coding + current_superblock, bit, current_run);
394
395 current_superblock += current_run;
396 if (bit)
397 num_partial_superblocks += current_run;
398
399 if (s->theora && current_run == MAXIMUM_LONG_BIT_RUN)
400 bit = get_bits1(gb);
401 else
402 bit ^= 1;
403 }
404
405 /* unpack the list of fully coded superblocks if any of the blocks were
406 * not marked as partially coded in the previous step */
407 if (num_partial_superblocks < s->superblock_count) {
408 int superblocks_decoded = 0;
409
410 current_superblock = 0;
411 bit = get_bits1(gb);
412 while (superblocks_decoded < s->superblock_count - num_partial_superblocks
413 && get_bits_left(gb) > 0) {
414 current_run = get_vlc2(gb,
415 s->superblock_run_length_vlc.table, 6, 2) + 1;
416 if (current_run == 34)
417 current_run += get_bits(gb, 12);
418
419 for (j = 0; j < current_run; current_superblock++) {
420 if (current_superblock >= s->superblock_count) {
421 av_log(s->avctx, AV_LOG_ERROR, "Invalid fully coded superblock run length\n");
422 return -1;
423 }
424
425 /* skip any superblocks already marked as partially coded */
426 if (s->superblock_coding[current_superblock] == SB_NOT_CODED) {
427 s->superblock_coding[current_superblock] = 2*bit;
428 j++;
429 }
430 }
431 superblocks_decoded += current_run;
432
433 if (s->theora && current_run == MAXIMUM_LONG_BIT_RUN)
434 bit = get_bits1(gb);
435 else
436 bit ^= 1;
437 }
438 }
439
440 /* if there were partial blocks, initialize bitstream for
441 * unpacking fragment codings */
442 if (num_partial_superblocks) {
443
444 current_run = 0;
445 bit = get_bits1(gb);
446 /* toggle the bit because as soon as the first run length is
447 * fetched the bit will be toggled again */
448 bit ^= 1;
449 }
450 }
451
452 /* figure out which fragments are coded; iterate through each
453 * superblock (all planes) */
454 s->total_num_coded_frags = 0;
455 memset(s->macroblock_coding, MODE_COPY, s->macroblock_count);
456
457 for (plane = 0; plane < 3; plane++) {
458 int sb_start = superblock_starts[plane];
459 int sb_end = sb_start + (plane ? s->c_superblock_count : s->y_superblock_count);
460 int num_coded_frags = 0;
461
462 for (i = sb_start; i < sb_end && get_bits_left(gb) > 0; i++) {
463
464 /* iterate through all 16 fragments in a superblock */
465 for (j = 0; j < 16; j++) {
466
467 /* if the fragment is in bounds, check its coding status */
468 current_fragment = s->superblock_fragments[i * 16 + j];
469 if (current_fragment != -1) {
470 int coded = s->superblock_coding[i];
471
472 if (s->superblock_coding[i] == SB_PARTIALLY_CODED) {
473
474 /* fragment may or may not be coded; this is the case
475 * that cares about the fragment coding runs */
476 if (current_run-- == 0) {
477 bit ^= 1;
478 current_run = get_vlc2(gb,
479 s->fragment_run_length_vlc.table, 5, 2);
480 }
481 coded = bit;
482 }
483
484 if (coded) {
485 /* default mode; actual mode will be decoded in
486 * the next phase */
487 s->all_fragments[current_fragment].coding_method =
488 MODE_INTER_NO_MV;
489 s->coded_fragment_list[plane][num_coded_frags++] =
490 current_fragment;
491 } else {
492 /* not coded; copy this fragment from the prior frame */
493 s->all_fragments[current_fragment].coding_method =
494 MODE_COPY;
495 }
496 }
497 }
498 }
499 s->total_num_coded_frags += num_coded_frags;
500 for (i = 0; i < 64; i++)
501 s->num_coded_frags[plane][i] = num_coded_frags;
502 if (plane < 2)
503 s->coded_fragment_list[plane+1] = s->coded_fragment_list[plane] + num_coded_frags;
504 }
505 return 0;
506 }
507
508 /*
509 * This function unpacks all the coding mode data for individual macroblocks
510 * from the bitstream.
511 */
512 static int unpack_modes(Vp3DecodeContext *s, GetBitContext *gb)
513 {
514 int i, j, k, sb_x, sb_y;
515 int scheme;
516 int current_macroblock;
517 int current_fragment;
518 int coding_mode;
519 int custom_mode_alphabet[CODING_MODE_COUNT];
520 const int *alphabet;
521 Vp3Fragment *frag;
522
523 if (s->keyframe) {
524 for (i = 0; i < s->fragment_count; i++)
525 s->all_fragments[i].coding_method = MODE_INTRA;
526
527 } else {
528
529 /* fetch the mode coding scheme for this frame */
530 scheme = get_bits(gb, 3);
531
532 /* is it a custom coding scheme? */
533 if (scheme == 0) {
534 for (i = 0; i < 8; i++)
535 custom_mode_alphabet[i] = MODE_INTER_NO_MV;
536 for (i = 0; i < 8; i++)
537 custom_mode_alphabet[get_bits(gb, 3)] = i;
538 alphabet = custom_mode_alphabet;
539 } else
540 alphabet = ModeAlphabet[scheme-1];
541
542 /* iterate through all of the macroblocks that contain 1 or more
543 * coded fragments */
544 for (sb_y = 0; sb_y < s->y_superblock_height; sb_y++) {
545 for (sb_x = 0; sb_x < s->y_superblock_width; sb_x++) {
546 if (get_bits_left(gb) <= 0)
547 return -1;
548
549 for (j = 0; j < 4; j++) {
550 int mb_x = 2*sb_x + (j>>1);
551 int mb_y = 2*sb_y + (((j>>1)+j)&1);
552 current_macroblock = mb_y * s->macroblock_width + mb_x;
553
554 if (mb_x >= s->macroblock_width || mb_y >= s->macroblock_height)
555 continue;
556
557 #define BLOCK_X (2*mb_x + (k&1))
558 #define BLOCK_Y (2*mb_y + (k>>1))
559 /* coding modes are only stored if the macroblock has at least one
560 * luma block coded, otherwise it must be INTER_NO_MV */
561 for (k = 0; k < 4; k++) {
562 current_fragment = BLOCK_Y*s->fragment_width[0] + BLOCK_X;
563 if (s->all_fragments[current_fragment].coding_method != MODE_COPY)
564 break;
565 }
566 if (k == 4) {
567 s->macroblock_coding[current_macroblock] = MODE_INTER_NO_MV;
568 continue;
569 }
570
571 /* mode 7 means get 3 bits for each coding mode */
572 if (scheme == 7)
573 coding_mode = get_bits(gb, 3);
574 else
575 coding_mode = alphabet
576 [get_vlc2(gb, s->mode_code_vlc.table, 3, 3)];
577
578 s->macroblock_coding[current_macroblock] = coding_mode;
579 for (k = 0; k < 4; k++) {
580 frag = s->all_fragments + BLOCK_Y*s->fragment_width[0] + BLOCK_X;
581 if (frag->coding_method != MODE_COPY)
582 frag->coding_method = coding_mode;
583 }
584
585 #define SET_CHROMA_MODES \
586 if (frag[s->fragment_start[1]].coding_method != MODE_COPY) \
587 frag[s->fragment_start[1]].coding_method = coding_mode;\
588 if (frag[s->fragment_start[2]].coding_method != MODE_COPY) \
589 frag[s->fragment_start[2]].coding_method = coding_mode;
590
591 if (s->chroma_y_shift) {
592 frag = s->all_fragments + mb_y*s->fragment_width[1] + mb_x;
593 SET_CHROMA_MODES
594 } else if (s->chroma_x_shift) {
595 frag = s->all_fragments + 2*mb_y*s->fragment_width[1] + mb_x;
596 for (k = 0; k < 2; k++) {
597 SET_CHROMA_MODES
598 frag += s->fragment_width[1];
599 }
600 } else {
601 for (k = 0; k < 4; k++) {
602 frag = s->all_fragments + BLOCK_Y*s->fragment_width[1] + BLOCK_X;
603 SET_CHROMA_MODES
604 }
605 }
606 }
607 }
608 }
609 }
610
611 return 0;
612 }
613
614 /*
615 * This function unpacks all the motion vectors for the individual
616 * macroblocks from the bitstream.
617 */
618 static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb)
619 {
620 int j, k, sb_x, sb_y;
621 int coding_mode;
622 int motion_x[4];
623 int motion_y[4];
624 int last_motion_x = 0;
625 int last_motion_y = 0;
626 int prior_last_motion_x = 0;
627 int prior_last_motion_y = 0;
628 int current_macroblock;
629 int current_fragment;
630 int frag;
631
632 if (s->keyframe)
633 return 0;
634
635 /* coding mode 0 is the VLC scheme; 1 is the fixed code scheme */
636 coding_mode = get_bits1(gb);
637
638 /* iterate through all of the macroblocks that contain 1 or more
639 * coded fragments */
640 for (sb_y = 0; sb_y < s->y_superblock_height; sb_y++) {
641 for (sb_x = 0; sb_x < s->y_superblock_width; sb_x++) {
642 if (get_bits_left(gb) <= 0)
643 return -1;
644
645 for (j = 0; j < 4; j++) {
646 int mb_x = 2*sb_x + (j>>1);
647 int mb_y = 2*sb_y + (((j>>1)+j)&1);
648 current_macroblock = mb_y * s->macroblock_width + mb_x;
649
650 if (mb_x >= s->macroblock_width || mb_y >= s->macroblock_height ||
651 (s->macroblock_coding[current_macroblock] == MODE_COPY))
652 continue;
653
654 switch (s->macroblock_coding[current_macroblock]) {
655
656 case MODE_INTER_PLUS_MV:
657 case MODE_GOLDEN_MV:
658 /* all 6 fragments use the same motion vector */
659 if (coding_mode == 0) {
660 motion_x[0] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
661 motion_y[0] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
662 } else {
663 motion_x[0] = fixed_motion_vector_table[get_bits(gb, 6)];
664 motion_y[0] = fixed_motion_vector_table[get_bits(gb, 6)];
665 }
666
667 /* vector maintenance, only on MODE_INTER_PLUS_MV */
668 if (s->macroblock_coding[current_macroblock] ==
669 MODE_INTER_PLUS_MV) {
670 prior_last_motion_x = last_motion_x;
671 prior_last_motion_y = last_motion_y;
672 last_motion_x = motion_x[0];
673 last_motion_y = motion_y[0];
674 }
675 break;
676
677 case MODE_INTER_FOURMV:
678 /* vector maintenance */
679 prior_last_motion_x = last_motion_x;
680 prior_last_motion_y = last_motion_y;
681
682 /* fetch 4 vectors from the bitstream, one for each
683 * Y fragment, then average for the C fragment vectors */
684 for (k = 0; k < 4; k++) {
685 current_fragment = BLOCK_Y*s->fragment_width[0] + BLOCK_X;
686 if (s->all_fragments[current_fragment].coding_method != MODE_COPY) {
687 if (coding_mode == 0) {
688 motion_x[k] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
689 motion_y[k] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
690 } else {
691 motion_x[k] = fixed_motion_vector_table[get_bits(gb, 6)];
692 motion_y[k] = fixed_motion_vector_table[get_bits(gb, 6)];
693 }
694 last_motion_x = motion_x[k];
695 last_motion_y = motion_y[k];
696 } else {
697 motion_x[k] = 0;
698 motion_y[k] = 0;
699 }
700 }
701 break;
702
703 case MODE_INTER_LAST_MV:
704 /* all 6 fragments use the last motion vector */
705 motion_x[0] = last_motion_x;
706 motion_y[0] = last_motion_y;
707
708 /* no vector maintenance (last vector remains the
709 * last vector) */
710 break;
711
712 case MODE_INTER_PRIOR_LAST:
713 /* all 6 fragments use the motion vector prior to the
714 * last motion vector */
715 motion_x[0] = prior_last_motion_x;
716 motion_y[0] = prior_last_motion_y;
717
718 /* vector maintenance */
719 prior_last_motion_x = last_motion_x;
720 prior_last_motion_y = last_motion_y;
721 last_motion_x = motion_x[0];
722 last_motion_y = motion_y[0];
723 break;
724
725 default:
726 /* covers intra, inter without MV, golden without MV */
727 motion_x[0] = 0;
728 motion_y[0] = 0;
729
730 /* no vector maintenance */
731 break;
732 }
733
734 /* assign the motion vectors to the correct fragments */
735 for (k = 0; k < 4; k++) {
736 current_fragment =
737 BLOCK_Y*s->fragment_width[0] + BLOCK_X;
738 if (s->macroblock_coding[current_macroblock] == MODE_INTER_FOURMV) {
739 s->motion_val[0][current_fragment][0] = motion_x[k];
740 s->motion_val[0][current_fragment][1] = motion_y[k];
741 } else {
742 s->motion_val[0][current_fragment][0] = motion_x[0];
743 s->motion_val[0][current_fragment][1] = motion_y[0];
744 }
745 }
746
747 if (s->chroma_y_shift) {
748 if (s->macroblock_coding[current_macroblock] == MODE_INTER_FOURMV) {
749 motion_x[0] = RSHIFT(motion_x[0] + motion_x[1] + motion_x[2] + motion_x[3], 2);
750 motion_y[0] = RSHIFT(motion_y[0] + motion_y[1] + motion_y[2] + motion_y[3], 2);
751 }
752 motion_x[0] = (motion_x[0]>>1) | (motion_x[0]&1);
753 motion_y[0] = (motion_y[0]>>1) | (motion_y[0]&1);
754 frag = mb_y*s->fragment_width[1] + mb_x;
755 s->motion_val[1][frag][0] = motion_x[0];
756 s->motion_val[1][frag][1] = motion_y[0];
757 } else if (s->chroma_x_shift) {
758 if (s->macroblock_coding[current_macroblock] == MODE_INTER_FOURMV) {
759 motion_x[0] = RSHIFT(motion_x[0] + motion_x[1], 1);
760 motion_y[0] = RSHIFT(motion_y[0] + motion_y[1], 1);
761 motion_x[1] = RSHIFT(motion_x[2] + motion_x[3], 1);
762 motion_y[1] = RSHIFT(motion_y[2] + motion_y[3], 1);
763 } else {
764 motion_x[1] = motion_x[0];
765 motion_y[1] = motion_y[0];
766 }
767 motion_x[0] = (motion_x[0]>>1) | (motion_x[0]&1);
768 motion_x[1] = (motion_x[1]>>1) | (motion_x[1]&1);
769
770 frag = 2*mb_y*s->fragment_width[1] + mb_x;
771 for (k = 0; k < 2; k++) {
772 s->motion_val[1][frag][0] = motion_x[k];
773 s->motion_val[1][frag][1] = motion_y[k];
774 frag += s->fragment_width[1];
775 }
776 } else {
777 for (k = 0; k < 4; k++) {
778 frag = BLOCK_Y*s->fragment_width[1] + BLOCK_X;
779 if (s->macroblock_coding[current_macroblock] == MODE_INTER_FOURMV) {
780 s->motion_val[1][frag][0] = motion_x[k];
781 s->motion_val[1][frag][1] = motion_y[k];
782 } else {
783 s->motion_val[1][frag][0] = motion_x[0];
784 s->motion_val[1][frag][1] = motion_y[0];
785 }
786 }
787 }
788 }
789 }
790 }
791
792 return 0;
793 }
794
795 static int unpack_block_qpis(Vp3DecodeContext *s, GetBitContext *gb)
796 {
797 int qpi, i, j, bit, run_length, blocks_decoded, num_blocks_at_qpi;
798 int num_blocks = s->total_num_coded_frags;
799
800 for (qpi = 0; qpi < s->nqps-1 && num_blocks > 0; qpi++) {
801 i = blocks_decoded = num_blocks_at_qpi = 0;
802
803 bit = get_bits1(gb);
804
805 do {
806 run_length = get_vlc2(gb, s->superblock_run_length_vlc.table, 6, 2) + 1;
807 if (run_length == 34)
808 run_length += get_bits(gb, 12);
809 blocks_decoded += run_length;
810
811 if (!bit)
812 num_blocks_at_qpi += run_length;
813
814 for (j = 0; j < run_length; i++) {
815 if (i >= s->total_num_coded_frags)
816 return -1;
817
818 if (s->all_fragments[s->coded_fragment_list[0][i]].qpi == qpi) {
819 s->all_fragments[s->coded_fragment_list[0][i]].qpi += bit;
820 j++;
821 }
822 }
823
824 if (run_length == MAXIMUM_LONG_BIT_RUN)
825 bit = get_bits1(gb);
826 else
827 bit ^= 1;
828 } while (blocks_decoded < num_blocks && get_bits_left(gb) > 0);
829
830 num_blocks -= num_blocks_at_qpi;
831 }
832
833 return 0;
834 }
835
836 /*
837 * This function is called by unpack_dct_coeffs() to extract the VLCs from
838 * the bitstream. The VLCs encode tokens which are used to unpack DCT
839 * data. This function unpacks all the VLCs for either the Y plane or both
840 * C planes, and is called for DC coefficients or different AC coefficient
841 * levels (since different coefficient types require different VLC tables.
842 *
843 * This function returns a residual eob run. E.g, if a particular token gave
844 * instructions to EOB the next 5 fragments and there were only 2 fragments
845 * left in the current fragment range, 3 would be returned so that it could
846 * be passed into the next call to this same function.
847 */
848 static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb,
849 VLC *table, int coeff_index,
850 int plane,
851 int eob_run)
852 {
853 int i, j = 0;
854 int token;
855 int zero_run = 0;
856 DCTELEM coeff = 0;
857 int bits_to_get;
858 int blocks_ended;
859 int coeff_i = 0;
860 int num_coeffs = s->num_coded_frags[plane][coeff_index];
861 int16_t *dct_tokens = s->dct_tokens[plane][coeff_index];
862
863 /* local references to structure members to avoid repeated deferences */
864 int *coded_fragment_list = s->coded_fragment_list[plane];
865 Vp3Fragment *all_fragments = s->all_fragments;
866 VLC_TYPE (*vlc_table)[2] = table->table;
867
868 if (num_coeffs < 0)
869 av_log(s->avctx, AV_LOG_ERROR, "Invalid number of coefficents at level %d\n", coeff_index);
870
871 if (eob_run > num_coeffs) {
872 coeff_i = blocks_ended = num_coeffs;
873 eob_run -= num_coeffs;
874 } else {
875 coeff_i = blocks_ended = eob_run;
876 eob_run = 0;
877 }
878
879 // insert fake EOB token to cover the split between planes or zzi
880 if (blocks_ended)
881 dct_tokens[j++] = blocks_ended << 2;
882
883 while (coeff_i < num_coeffs && get_bits_left(gb) > 0) {
884 /* decode a VLC into a token */
885 token = get_vlc2(gb, vlc_table, 5, 3);
886 /* use the token to get a zero run, a coefficient, and an eob run */
887 if (token <= 6) {
888 eob_run = eob_run_base[token];
889 if (eob_run_get_bits[token])
890 eob_run += get_bits(gb, eob_run_get_bits[token]);
891
892 // record only the number of blocks ended in this plane,
893 // any spill will be recorded in the next plane.
894 if (eob_run > num_coeffs - coeff_i) {
895 dct_tokens[j++] = TOKEN_EOB(num_coeffs - coeff_i);
896 blocks_ended += num_coeffs - coeff_i;
897 eob_run -= num_coeffs - coeff_i;
898 coeff_i = num_coeffs;
899 } else {
900 dct_tokens[j++] = TOKEN_EOB(eob_run);
901 blocks_ended += eob_run;
902 coeff_i += eob_run;
903 eob_run = 0;
904 }
905 } else {
906 bits_to_get = coeff_get_bits[token];
907 if (bits_to_get)
908 bits_to_get = get_bits(gb, bits_to_get);
909 coeff = coeff_tables[token][bits_to_get];
910
911 zero_run = zero_run_base[token];
912 if (zero_run_get_bits[token])
913 zero_run += get_bits(gb, zero_run_get_bits[token]);
914
915 if (zero_run) {
916 dct_tokens[j++] = TOKEN_ZERO_RUN(coeff, zero_run);
917 } else {
918 // Save DC into the fragment structure. DC prediction is
919 // done in raster order, so the actual DC can't be in with
920 // other tokens. We still need the token in dct_tokens[]
921 // however, or else the structure collapses on itself.
922 if (!coeff_index)
923 all_fragments[coded_fragment_list[coeff_i]].dc = coeff;
924
925 dct_tokens[j++] = TOKEN_COEFF(coeff);
926 }
927
928 if (coeff_index + zero_run > 64) {
929 av_log(s->avctx, AV_LOG_DEBUG, "Invalid zero run of %d with"
930 " %d coeffs left\n", zero_run, 64-coeff_index);
931 zero_run = 64 - coeff_index;
932 }
933
934 // zero runs code multiple coefficients,
935 // so don't try to decode coeffs for those higher levels
936 for (i = coeff_index+1; i <= coeff_index+zero_run; i++)
937 s->num_coded_frags[plane][i]--;
938 coeff_i++;
939 }
940 }
941
942 if (blocks_ended > s->num_coded_frags[plane][coeff_index])
943 av_log(s->avctx, AV_LOG_ERROR, "More blocks ended than coded!\n");
944
945 // decrement the number of blocks that have higher coeffecients for each
946 // EOB run at this level
947 if (blocks_ended)
948 for (i = coeff_index+1; i < 64; i++)
949 s->num_coded_frags[plane][i] -= blocks_ended;
950
951 // setup the next buffer
952 if (plane < 2)
953 s->dct_tokens[plane+1][coeff_index] = dct_tokens + j;
954 else if (coeff_index < 63)
955 s->dct_tokens[0][coeff_index+1] = dct_tokens + j;
956
957 return eob_run;
958 }
959
960 static void reverse_dc_prediction(Vp3DecodeContext *s,
961 int first_fragment,
962 int fragment_width,
963 int fragment_height);
964 /*
965 * This function unpacks all of the DCT coefficient data from the
966 * bitstream.
967 */
968 static int unpack_dct_coeffs(Vp3DecodeContext *s, GetBitContext *gb)
969 {
970 int i;
971 int dc_y_table;
972 int dc_c_table;
973 int ac_y_table;
974 int ac_c_table;
975 int residual_eob_run = 0;
976 VLC *y_tables[64];
977 VLC *c_tables[64];
978
979 s->dct_tokens[0][0] = s->dct_tokens_base;
980
981 /* fetch the DC table indexes */
982 dc_y_table = get_bits(gb, 4);
983 dc_c_table = get_bits(gb, 4);
984
985 /* unpack the Y plane DC coefficients */
986 residual_eob_run = unpack_vlcs(s, gb, &s->dc_vlc[dc_y_table], 0,
987 0, residual_eob_run);
988
989 /* reverse prediction of the Y-plane DC coefficients */
990 reverse_dc_prediction(s, 0, s->fragment_width[0], s->fragment_height[0]);
991
992 /* unpack the C plane DC coefficients */
993 residual_eob_run = unpack_vlcs(s, gb, &s->dc_vlc[dc_c_table], 0,
994 1, residual_eob_run);
995 residual_eob_run = unpack_vlcs(s, gb, &s->dc_vlc[dc_c_table], 0,
996 2, residual_eob_run);
997
998 /* reverse prediction of the C-plane DC coefficients */
999 if (!(s->avctx->flags & CODEC_FLAG_GRAY))
1000 {
1001 reverse_dc_prediction(s, s->fragment_start[1],
1002 s->fragment_width[1], s->fragment_height[1]);
1003 reverse_dc_prediction(s, s->fragment_start[2],
1004 s->fragment_width[1], s->fragment_height[1]);
1005 }
1006
1007 /* fetch the AC table indexes */
1008 ac_y_table = get_bits(gb, 4);
1009 ac_c_table = get_bits(gb, 4);
1010
1011 /* build tables of AC VLC tables */
1012 for (i = 1; i <= 5; i++) {
1013 y_tables[i] = &s->ac_vlc_1[ac_y_table];
1014 c_tables[i] = &s->ac_vlc_1[ac_c_table];
1015 }
1016 for (i = 6; i <= 14; i++) {
1017 y_tables[i] = &s->ac_vlc_2[ac_y_table];
1018 c_tables[i] = &s->ac_vlc_2[ac_c_table];
1019 }
1020 for (i = 15; i <= 27; i++) {
1021 y_tables[i] = &s->ac_vlc_3[ac_y_table];
1022 c_tables[i] = &s->ac_vlc_3[ac_c_table];
1023 }
1024 for (i = 28; i <= 63; i++) {
1025 y_tables[i] = &s->ac_vlc_4[ac_y_table];
1026 c_tables[i] = &s->ac_vlc_4[ac_c_table];
1027 }
1028
1029 /* decode all AC coefficents */
1030 for (i = 1; i <= 63; i++) {
1031 residual_eob_run = unpack_vlcs(s, gb, y_tables[i], i,
1032 0, residual_eob_run);
1033
1034 residual_eob_run = unpack_vlcs(s, gb, c_tables[i], i,
1035 1, residual_eob_run);
1036 residual_eob_run = unpack_vlcs(s, gb, c_tables[i], i,
1037 2, residual_eob_run);
1038 }
1039
1040 return 0;
1041 }
1042
1043 /*
1044 * This function reverses the DC prediction for each coded fragment in
1045 * the frame. Much of this function is adapted directly from the original
1046 * VP3 source code.
1047 */
1048 #define COMPATIBLE_FRAME(x) \
1049 (compatible_frame[s->all_fragments[x].coding_method] == current_frame_type)
1050 #define DC_COEFF(u) s->all_fragments[u].dc
1051
1052 static void reverse_dc_prediction(Vp3DecodeContext *s,
1053 int first_fragment,
1054 int fragment_width,
1055 int fragment_height)
1056 {
1057
1058 #define PUL 8
1059 #define PU 4
1060 #define PUR 2
1061 #define PL 1
1062
1063 int x, y;
1064 int i = first_fragment;
1065
1066 int predicted_dc;
1067
1068 /* DC values for the left, up-left, up, and up-right fragments */
1069 int vl, vul, vu, vur;
1070
1071 /* indexes for the left, up-left, up, and up-right fragments */
1072 int l, ul, u, ur;
1073
1074 /*
1075 * The 6 fields mean:
1076 * 0: up-left multiplier
1077 * 1: up multiplier
1078 * 2: up-right multiplier
1079 * 3: left multiplier
1080 */
1081 static const int predictor_transform[16][4] = {
1082 { 0, 0, 0, 0},
1083 { 0, 0, 0,128}, // PL
1084 { 0, 0,128, 0}, // PUR
1085 { 0, 0, 53, 75}, // PUR|PL
1086 { 0,128, 0, 0}, // PU
1087 { 0, 64, 0, 64}, // PU|PL
1088 { 0,128, 0, 0}, // PU|PUR
1089 { 0, 0, 53, 75}, // PU|PUR|PL
1090 {128, 0, 0, 0}, // PUL
1091 { 0, 0, 0,128}, // PUL|PL
1092 { 64, 0, 64, 0}, // PUL|PUR
1093 { 0, 0, 53, 75}, // PUL|PUR|PL
1094 { 0,128, 0, 0}, // PUL|PU
1095 {-104,116, 0,116}, // PUL|PU|PL
1096 { 24, 80, 24, 0}, // PUL|PU|PUR
1097 {-104,116, 0,116} // PUL|PU|PUR|PL
1098 };
1099
1100 /* This table shows which types of blocks can use other blocks for
1101 * prediction. For example, INTRA is the only mode in this table to
1102 * have a frame number of 0. That means INTRA blocks can only predict
1103 * from other INTRA blocks. There are 2 golden frame coding types;
1104 * blocks encoding in these modes can only predict from other blocks
1105 * that were encoded with these 1 of these 2 modes. */
1106 static const unsigned char compatible_frame[9] = {
1107 1, /* MODE_INTER_NO_MV */
1108 0, /* MODE_INTRA */
1109 1, /* MODE_INTER_PLUS_MV */
1110 1, /* MODE_INTER_LAST_MV */
1111 1, /* MODE_INTER_PRIOR_MV */
1112 2, /* MODE_USING_GOLDEN */
1113 2, /* MODE_GOLDEN_MV */
1114 1, /* MODE_INTER_FOUR_MV */
1115 3 /* MODE_COPY */
1116 };
1117 int current_frame_type;
1118
1119 /* there is a last DC predictor for each of the 3 frame types */
1120 short last_dc[3];
1121
1122 int transform = 0;
1123
1124 vul = vu = vur = vl = 0;
1125 last_dc[0] = last_dc[1] = last_dc[2] = 0;
1126
1127 /* for each fragment row... */
1128 for (y = 0; y < fragment_height; y++) {
1129
1130 /* for each fragment in a row... */
1131 for (x = 0; x < fragment_width; x++, i++) {
1132
1133 /* reverse prediction if this block was coded */
1134 if (s->all_fragments[i].coding_method != MODE_COPY) {
1135
1136 current_frame_type =
1137 compatible_frame[s->all_fragments[i].coding_method];
1138
1139 transform= 0;
1140 if(x){
1141 l= i-1;
1142 vl = DC_COEFF(l);
1143 if(COMPATIBLE_FRAME(l))
1144 transform |= PL;
1145 }
1146 if(y){
1147 u= i-fragment_width;
1148 vu = DC_COEFF(u);
1149 if(COMPATIBLE_FRAME(u))
1150 transform |= PU;
1151 if(x){
1152 ul= i-fragment_width-1;
1153 vul = DC_COEFF(ul);
1154 if(COMPATIBLE_FRAME(ul))
1155 transform |= PUL;
1156 }
1157 if(x + 1 < fragment_width){
1158 ur= i-fragment_width+1;
1159 vur = DC_COEFF(ur);
1160 if(COMPATIBLE_FRAME(ur))
1161 transform |= PUR;
1162 }
1163 }
1164
1165 if (transform == 0) {
1166
1167 /* if there were no fragments to predict from, use last
1168 * DC saved */
1169 predicted_dc = last_dc[current_frame_type];
1170 } else {
1171
1172 /* apply the appropriate predictor transform */
1173 predicted_dc =
1174 (predictor_transform[transform][0] * vul) +
1175 (predictor_transform[transform][1] * vu) +
1176 (predictor_transform[transform][2] * vur) +
1177 (predictor_transform[transform][3] * vl);
1178
1179 predicted_dc /= 128;
1180
1181 /* check for outranging on the [ul u l] and
1182 * [ul u ur l] predictors */
1183 if ((transform == 15) || (transform == 13)) {
1184 if (FFABS(predicted_dc - vu) > 128)
1185 predicted_dc = vu;
1186 else if (FFABS(predicted_dc - vl) > 128)
1187 predicted_dc = vl;
1188 else if (FFABS(predicted_dc - vul) > 128)
1189 predicted_dc = vul;
1190 }
1191 }
1192
1193 /* at long last, apply the predictor */
1194 DC_COEFF(i) += predicted_dc;
1195 /* save the DC */
1196 last_dc[current_frame_type] = DC_COEFF(i);
1197 }
1198 }
1199 }
1200 }
1201
1202 static void apply_loop_filter(Vp3DecodeContext *s, int plane, int ystart, int yend)
1203 {
1204 int x, y;
1205 int *bounding_values= s->bounding_values_array+127;
1206
1207 int width = s->fragment_width[!!plane];
1208 int height = s->fragment_height[!!plane];
1209 int fragment = s->fragment_start [plane] + ystart * width;
1210 int stride = s->current_frame.linesize[plane];
1211 uint8_t *plane_data = s->current_frame.data [plane];
1212 if (!s->flipped_image) stride = -stride;
1213 plane_data += s->data_offset[plane] + 8*ystart*stride;
1214
1215 for (y = ystart; y < yend; y++) {
1216
1217 for (x = 0; x < width; x++) {
1218 /* This code basically just deblocks on the edges of coded blocks.
1219 * However, it has to be much more complicated because of the
1220 * braindamaged deblock ordering used in VP3/Theora. Order matters
1221 * because some pixels get filtered twice. */
1222 if( s->all_fragments[fragment].coding_method != MODE_COPY )
1223 {
1224 /* do not perform left edge filter for left columns frags */
1225 if (x > 0) {
1226 s->dsp.vp3_h_loop_filter(
1227 plane_data + 8*x,
1228 stride, bounding_values);
1229 }
1230
1231 /* do not perform top edge filter for top row fragments */
1232 if (y > 0) {
1233 s->dsp.vp3_v_loop_filter(
1234 plane_data + 8*x,
1235 stride, bounding_values);
1236 }
1237
1238 /* do not perform right edge filter for right column
1239 * fragments or if right fragment neighbor is also coded
1240 * in this frame (it will be filtered in next iteration) */
1241 if ((x < width - 1) &&
1242 (s->all_fragments[fragment + 1].coding_method == MODE_COPY)) {
1243 s->dsp.vp3_h_loop_filter(
1244 plane_data + 8*x + 8,
1245 stride, bounding_values);
1246 }
1247
1248 /* do not perform bottom edge filter for bottom row
1249 * fragments or if bottom fragment neighbor is also coded
1250 * in this frame (it will be filtered in the next row) */
1251 if ((y < height - 1) &&
1252 (s->all_fragments[fragment + width].coding_method == MODE_COPY)) {
1253 s->dsp.vp3_v_loop_filter(
1254 plane_data + 8*x + 8*stride,
1255 stride, bounding_values);
1256 }
1257 }
1258
1259 fragment++;
1260 }
1261 plane_data += 8*stride;
1262 }
1263 }
1264
1265 /**
1266 * Pulls DCT tokens from the 64 levels to decode and dequant the coefficients
1267 * for the next block in coding order
1268 */
1269 static inline int vp3_dequant(Vp3DecodeContext *s, Vp3Fragment *frag,
1270 int plane, int inter, DCTELEM block[64])
1271 {
1272 int16_t *dequantizer = s->qmat[frag->qpi][inter][plane];
1273 uint8_t *perm = s->scantable.permutated;
1274 int i = 0;
1275
1276 do {
1277 int token = *s->dct_tokens[plane][i];
1278 switch (token & 3) {
1279 case 0: // EOB
1280 if (--token < 4) // 0-3 are token types, so the EOB run must now be 0
1281 s->dct_tokens[plane][i]++;
1282 else
1283 *s->dct_tokens[plane][i] = token & ~3;
1284 goto end;
1285 case 1: // zero run
1286 s->dct_tokens[plane][i]++;
1287 i += (token >> 2) & 0x7f;
1288 block[perm[i]] = (token >> 9) * dequantizer[perm[i]];
1289 i++;
1290 break;
1291 case 2: // coeff
1292 block[perm[i]] = (token >> 2) * dequantizer[perm[i]];
1293 s->dct_tokens[plane][i++]++;
1294 break;
1295 default: // shouldn't happen
1296 return i;
1297 }
1298 } while (i < 64);
1299 end:
1300 // the actual DC+prediction is in the fragment structure
1301 block[0] = frag->dc * s->qmat[0][inter][plane][0];
1302 return i;
1303 }
1304
1305 /**
1306 * called when all pixels up to row y are complete
1307 */
1308 static void vp3_draw_horiz_band(Vp3DecodeContext *s, int y)
1309 {
1310 int h, cy;
1311 int offset[4];
1312
1313 if(s->avctx->draw_horiz_band==NULL)
1314 return;
1315
1316 h= y - s->last_slice_end;
1317 y -= h;
1318
1319 if (!s->flipped_image) {
1320 if (y == 0)
1321 h -= s->height - s->avctx->height; // account for non-mod16
1322 y = s->height - y - h;
1323 }
1324
1325 cy = y >> 1;
1326 offset[0] = s->current_frame.linesize[0]*y;
1327 offset[1] = s->current_frame.linesize[1]*cy;
1328 offset[2] = s->current_frame.linesize[2]*cy;
1329 offset[3] = 0;
1330
1331 emms_c();
1332 s->avctx->draw_horiz_band(s->avctx, &s->current_frame, offset, y, 3, h);
1333 s->last_slice_end= y + h;
1334 }
1335
1336 /*
1337 * Perform the final rendering for a particular slice of data.
1338 * The slice number ranges from 0..(c_superblock_height - 1).
1339 */
1340 static void render_slice(Vp3DecodeContext *s, int slice)
1341 {
1342 int x, y, i, j;
1343 LOCAL_ALIGNED_16(DCTELEM, block, [64]);
1344 int motion_x = 0xdeadbeef, motion_y = 0xdeadbeef;
1345 int motion_halfpel_index;
1346 uint8_t *motion_source;
1347 int plane, first_pixel;
1348
1349 if (slice >= s->c_superblock_height)
1350 return;
1351
1352 for (plane = 0; plane < 3; plane++) {
1353 uint8_t *output_plane = s->current_frame.data [plane] + s->data_offset[plane];
1354 uint8_t * last_plane = s-> last_frame.data [plane] + s->data_offset[plane];
1355 uint8_t *golden_plane = s-> golden_frame.data [plane] + s->data_offset[plane];
1356 int stride = s->current_frame.linesize[plane];
1357 int plane_width = s->width >> (plane && s->chroma_x_shift);
1358 int plane_height = s->height >> (plane && s->chroma_y_shift);
1359 int8_t (*motion_val)[2] = s->motion_val[!!plane];
1360
1361 int sb_x, sb_y = slice << (!plane && s->chroma_y_shift);
1362 int slice_height = sb_y + 1 + (!plane && s->chroma_y_shift);
1363 int slice_width = plane ? s->c_superblock_width : s->y_superblock_width;
1364
1365 int fragment_width = s->fragment_width[!!plane];
1366 int fragment_height = s->fragment_height[!!plane];
1367 int fragment_start = s->fragment_start[plane];
1368
1369 if (!s->flipped_image) stride = -stride;
1370 if (CONFIG_GRAY && plane && (s->avctx->flags & CODEC_FLAG_GRAY))
1371 continue;
1372
1373
1374 if(FFABS(stride) > 2048)
1375 return; //various tables are fixed size
1376
1377 /* for each superblock row in the slice (both of them)... */
1378 for (; sb_y < slice_height; sb_y++) {
1379
1380 /* for each superblock in a row... */
1381 for (sb_x = 0; sb_x < slice_width; sb_x++) {
1382
1383 /* for each block in a superblock... */
1384 for (j = 0; j < 16; j++) {
1385 x = 4*sb_x + hilbert_offset[j][0];
1386 y = 4*sb_y + hilbert_offset[j][1];
1387
1388 i = fragment_start + y*fragment_width + x;
1389
1390 // bounds check
1391 if (x >= fragment_width || y >= fragment_height)
1392 continue;
1393
1394 first_pixel = 8*y*stride + 8*x;
1395
1396 /* transform if this block was coded */
1397 if (s->all_fragments[i].coding_method != MODE_COPY) {
1398 int intra = s->all_fragments[i].coding_method == MODE_INTRA;
1399
1400 if ((s->all_fragments[i].coding_method == MODE_USING_GOLDEN) ||
1401 (s->all_fragments[i].coding_method == MODE_GOLDEN_MV))
1402 motion_source= golden_plane;
1403 else
1404 motion_source= last_plane;
1405
1406 motion_source += first_pixel;
1407 motion_halfpel_index = 0;
1408
1409 /* sort out the motion vector if this fragment is coded
1410 * using a motion vector method */
1411 if ((s->all_fragments[i].coding_method > MODE_INTRA) &&
1412 (s->all_fragments[i].coding_method != MODE_USING_GOLDEN)) {
1413 int src_x, src_y;
1414 motion_x = motion_val[y*fragment_width + x][0];
1415 motion_y = motion_val[y*fragment_width + x][1];
1416
1417 src_x= (motion_x>>1) + 8*x;
1418 src_y= (motion_y>>1) + 8*y;
1419
1420 motion_halfpel_index = motion_x & 0x01;
1421 motion_source += (motion_x >> 1);
1422
1423 motion_halfpel_index |= (motion_y & 0x01) << 1;
1424 motion_source += ((motion_y >> 1) * stride);
1425
1426 if(src_x<0 || src_y<0 || src_x + 9 >= plane_width || src_y + 9 >= plane_height){
1427 uint8_t *temp= s->edge_emu_buffer;
1428 if(stride<0) temp -= 9*stride;
1429 else temp += 9*stride;
1430
1431 ff_emulated_edge_mc(temp, motion_source, stride, 9, 9, src_x, src_y, plane_width, plane_height);
1432 motion_source= temp;
1433 }
1434 }
1435
1436
1437 /* first, take care of copying a block from either the
1438 * previous or the golden frame */
1439 if (s->all_fragments[i].coding_method != MODE_INTRA) {
1440 /* Note, it is possible to implement all MC cases with
1441 put_no_rnd_pixels_l2 which would look more like the
1442 VP3 source but this would be slower as
1443 put_no_rnd_pixels_tab is better optimzed */
1444 if(motion_halfpel_index != 3){
1445 s->dsp.put_no_rnd_pixels_tab[1][motion_halfpel_index](
1446 output_plane + first_pixel,
1447 motion_source, stride, 8);
1448 }else{
1449 int d= (motion_x ^ motion_y)>>31; // d is 0 if motion_x and _y have the same sign, else -1
1450 s->dsp.put_no_rnd_pixels_l2[1](
1451 output_plane + first_pixel,
1452 motion_source - d,
1453 motion_source + stride + 1 + d,
1454 stride, 8);
1455 }
1456 }
1457
1458 s->dsp.clear_block(block);
1459 vp3_dequant(s, s->all_fragments + i, plane, !intra, block);
1460
1461 /* invert DCT and place (or add) in final output */
1462
1463 if (s->all_fragments[i].coding_method == MODE_INTRA) {
1464 if(s->avctx->idct_algo!=FF_IDCT_VP3)
1465 block[0] += 128<<3;
1466 s->dsp.idct_put(
1467 output_plane + first_pixel,
1468 stride,
1469 block);
1470 } else {
1471 s->dsp.idct_add(
1472 output_plane + first_pixel,
1473 stride,
1474 block);
1475 }
1476 } else {
1477
1478 /* copy directly from the previous frame */
1479 s->dsp.put_pixels_tab[1][0](
1480 output_plane + first_pixel,
1481 last_plane + first_pixel,
1482 stride, 8);
1483
1484 }
1485 }
1486 }
1487
1488 // Filter up to the last row in the superblock row
1489 apply_loop_filter(s, plane, 4*sb_y - !!sb_y, FFMIN(4*sb_y+3, fragment_height-1));
1490 }
1491 }
1492
1493 /* this looks like a good place for slice dispatch... */
1494 /* algorithm:
1495 * if (slice == s->macroblock_height - 1)
1496 * dispatch (both last slice & 2nd-to-last slice);
1497 * else if (slice > 0)
1498 * dispatch (slice - 1);
1499 */
1500
1501 vp3_draw_horiz_band(s, FFMIN(64*slice + 64-16, s->height-16));
1502 }
1503
1504 /*
1505 * This is the ffmpeg/libavcodec API init function.
1506 */
1507 static av_cold int vp3_decode_init(AVCodecContext *avctx)
1508 {
1509 Vp3DecodeContext *s = avctx->priv_data;
1510 int i, inter, plane;
1511 int c_width;
1512 int c_height;
1513 int y_fragment_count, c_fragment_count;
1514
1515 if (avctx->codec_tag == MKTAG('V','P','3','0'))
1516 s->version = 0;
1517 else
1518 s->version = 1;
1519
1520 s->avctx = avctx;
1521 s->width = FFALIGN(avctx->width, 16);
1522 s->height = FFALIGN(avctx->height, 16);
1523 if (avctx->pix_fmt == PIX_FMT_NONE)
1524 avctx->pix_fmt = PIX_FMT_YUV420P;
1525 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
1526 if(avctx->idct_algo==FF_IDCT_AUTO)
1527 avctx->idct_algo=FF_IDCT_VP3;
1528 dsputil_init(&s->dsp, avctx);
1529
1530 ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
1531
1532 /* initialize to an impossible value which will force a recalculation
1533 * in the first frame decode */
1534 for (i = 0; i < 3; i++)
1535 s->qps[i] = -1;
1536
1537 avcodec_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_x_shift, &s->chroma_y_shift);
1538
1539 s->y_superblock_width = (s->width + 31) / 32;
1540 s->y_superblock_height = (s->height + 31) / 32;
1541 s->y_superblock_count = s->y_superblock_width * s->y_superblock_height;
1542
1543 /* work out the dimensions for the C planes */
1544 c_width = s->width >> s->chroma_x_shift;
1545 c_height = s->height >> s->chroma_y_shift;
1546 s->c_superblock_width = (c_width + 31) / 32;
1547 s->c_superblock_height = (c_height + 31) / 32;
1548 s->c_superblock_count = s->c_superblock_width * s->c_superblock_height;
1549
1550 s->superblock_count = s->y_superblock_count + (s->c_superblock_count * 2);
1551 s->u_superblock_start = s->y_superblock_count;
1552 s->v_superblock_start = s->u_superblock_start + s->c_superblock_count;
1553 s->superblock_coding = av_malloc(s->superblock_count);
1554
1555 s->macroblock_width = (s->width + 15) / 16;
1556 s->macroblock_height = (s->height + 15) / 16;
1557 s->macroblock_count = s->macroblock_width * s->macroblock_height;
1558
1559 s->fragment_width[0] = s->width / FRAGMENT_PIXELS;
1560 s->fragment_height[0] = s->height / FRAGMENT_PIXELS;
1561 s->fragment_width[1] = s->fragment_width[0] >> s->chroma_x_shift;
1562 s->fragment_height[1] = s->fragment_height[0] >> s->chroma_y_shift;
1563
1564 /* fragment count covers all 8x8 blocks for all 3 planes */
1565 y_fragment_count = s->fragment_width[0] * s->fragment_height[0];
1566 c_fragment_count = s->fragment_width[1] * s->fragment_height[1];
1567 s->fragment_count = y_fragment_count + 2*c_fragment_count;
1568 s->fragment_start[1] = y_fragment_count;
1569 s->fragment_start[2] = y_fragment_count + c_fragment_count;
1570
1571 s->all_fragments = av_malloc(s->fragment_count * sizeof(Vp3Fragment));
1572 s->coded_fragment_list[0] = av_malloc(s->fragment_count * sizeof(int));
1573 s->dct_tokens_base = av_malloc(64*s->fragment_count * sizeof(*s->dct_tokens_base));
1574 s->motion_val[0] = av_malloc(y_fragment_count * sizeof(*s->motion_val[0]));
1575 s->motion_val[1] = av_malloc(c_fragment_count * sizeof(*s->motion_val[1]));
1576
1577 if (!s->superblock_coding || !s->all_fragments || !s->dct_tokens_base ||
1578 !s->coded_fragment_list[0] || !s->motion_val[0] || !s->motion_val[1]) {
1579 vp3_decode_end(avctx);
1580 return -1;
1581 }
1582
1583 if (!s->theora_tables)
1584 {
1585 for (i = 0; i < 64; i++) {
1586 s->coded_dc_scale_factor[i] = vp31_dc_scale_factor[i];
1587 s->coded_ac_scale_factor[i] = vp31_ac_scale_factor[i];
1588 s->base_matrix[0][i] = vp31_intra_y_dequant[i];
1589 s->base_matrix[1][i] = vp31_intra_c_dequant[i];
1590 s->base_matrix[2][i] = vp31_inter_dequant[i];
1591 s->filter_limit_values[i] = vp31_filter_limit_values[i];
1592 }
1593
1594 for(inter=0; inter<2; inter++){
1595 for(plane=0; plane<3; plane++){
1596 s->qr_count[inter][plane]= 1;
1597 s->qr_size [inter][plane][0]= 63;
1598 s->qr_base [inter][plane][0]=
1599 s->qr_base [inter][plane][1]= 2*inter + (!!plane)*!inter;
1600 }
1601 }
1602
1603 /* init VLC tables */
1604 for (i = 0; i < 16; i++) {
1605
1606 /* DC histograms */
1607 init_vlc(&s->dc_vlc[i], 5, 32,
1608 &dc_bias[i][0][1], 4, 2,
1609 &dc_bias[i][0][0], 4, 2, 0);
1610
1611 /* group 1 AC histograms */
1612 init_vlc(&s->ac_vlc_1[i], 5, 32,
1613 &ac_bias_0[i][0][1], 4, 2,
1614 &ac_bias_0[i][0][0], 4, 2, 0);
1615
1616 /* group 2 AC histograms */
1617 init_vlc(&s->ac_vlc_2[i], 5, 32,
1618 &ac_bias_1[i][0][1], 4, 2,
1619 &ac_bias_1[i][0][0], 4, 2, 0);
1620
1621 /* group 3 AC histograms */
1622 init_vlc(&s->ac_vlc_3[i], 5, 32,
1623 &ac_bias_2[i][0][1], 4, 2,
1624 &ac_bias_2[i][0][0], 4, 2, 0);
1625
1626 /* group 4 AC histograms */
1627 init_vlc(&s->ac_vlc_4[i], 5, 32,
1628 &ac_bias_3[i][0][1], 4, 2,
1629 &ac_bias_3[i][0][0], 4, 2, 0);
1630 }
1631 } else {
1632 for (i = 0; i < 16; i++) {
1633
1634 /* DC histograms */
1635 if (init_vlc(&s->dc_vlc[i], 5, 32,
1636 &s->huffman_table[i][0][1], 4, 2,
1637 &s->huffman_table[i][0][0], 4, 2, 0) < 0)
1638 goto vlc_fail;
1639
1640 /* group 1 AC histograms */
1641 if (init_vlc(&s->ac_vlc_1[i], 5, 32,
1642 &s->huffman_table[i+16][0][1], 4, 2,
1643 &s->huffman_table[i+16][0][0], 4, 2, 0) < 0)
1644 goto vlc_fail;
1645
1646 /* group 2 AC histograms */
1647 if (init_vlc(&s->ac_vlc_2[i], 5, 32,
1648 &s->huffman_table[i+16*2][0][1], 4, 2,
1649 &s->huffman_table[i+16*2][0][0], 4, 2, 0) < 0)
1650 goto vlc_fail;
1651
1652 /* group 3 AC histograms */
1653 if (init_vlc(&s->ac_vlc_3[i], 5, 32,
1654 &s->huffman_table[i+16*3][0][1], 4, 2,
1655 &s->huffman_table[i+16*3][0][0], 4, 2, 0) < 0)
1656 goto vlc_fail;
1657
1658 /* group 4 AC histograms */
1659 if (init_vlc(&s->ac_vlc_4[i], 5, 32,
1660 &s->huffman_table[i+16*4][0][1], 4, 2,
1661 &s->huffman_table[i+16*4][0][0], 4, 2, 0) < 0)
1662 goto vlc_fail;
1663 }
1664 }
1665
1666 init_vlc(&s->superblock_run_length_vlc, 6, 34,
1667 &superblock_run_length_vlc_table[0][1], 4, 2,
1668 &superblock_run_length_vlc_table[0][0], 4, 2, 0);
1669
1670 init_vlc(&s->fragment_run_length_vlc, 5, 30,
1671 &fragment_run_length_vlc_table[0][1], 4, 2,
1672 &fragment_run_length_vlc_table[0][0], 4, 2, 0);
1673
1674 init_vlc(&s->mode_code_vlc, 3, 8,
1675 &mode_code_vlc_table[0][1], 2, 1,
1676 &mode_code_vlc_table[0][0], 2, 1, 0);
1677
1678 init_vlc(&s->motion_vector_vlc, 6, 63,
1679 &motion_vector_vlc_table[0][1], 2, 1,
1680 &motion_vector_vlc_table[0][0], 2, 1, 0);
1681
1682 /* work out the block mapping tables */
1683 s->superblock_fragments = av_malloc(s->superblock_count * 16 * sizeof(int));
1684 s->macroblock_coding = av_malloc(s->macroblock_count + 1);
1685 if (!s->superblock_fragments || !s->macroblock_coding) {
1686 vp3_decode_end(avctx);
1687 return -1;
1688 }
1689 init_block_mapping(s);
1690
1691 for (i = 0; i < 3; i++) {
1692 s->current_frame.data[i] = NULL;
1693 s->last_frame.data[i] = NULL;
1694 s->golden_frame.data[i] = NULL;
1695 }
1696
1697 return 0;
1698
1699 vlc_fail:
1700 av_log(avctx, AV_LOG_FATAL, "Invalid huffman table\n");
1701 return -1;
1702 }
1703
1704 /*
1705 * This is the ffmpeg/libavcodec API frame decode function.
1706 */
1707 static int vp3_decode_frame(AVCodecContext *avctx,
1708 void *data, int *data_size,
1709 AVPacket *avpkt)
1710 {
1711 const uint8_t *buf = avpkt->data;
1712 int buf_size = avpkt->size;
1713 Vp3DecodeContext *s = avctx->priv_data;
1714 GetBitContext gb;
1715 static int counter = 0;
1716 int i;
1717
1718 init_get_bits(&gb, buf, buf_size * 8);
1719
1720 if (s->theora && get_bits1(&gb))
1721 {
1722 av_log(avctx, AV_LOG_ERROR, "Header packet passed to frame decoder, skipping\n");
1723 return -1;
1724 }
1725
1726 s->keyframe = !get_bits1(&gb);
1727 if (!s->theora)
1728 skip_bits(&gb, 1);
1729 for (i = 0; i < 3; i++)
1730 s->last_qps[i] = s->qps[i];
1731
1732 s->nqps=0;
1733 do{
1734 s->qps[s->nqps++]= get_bits(&gb, 6);
1735 } while(s->theora >= 0x030200 && s->nqps<3 && get_bits1(&gb));
1736 for (i = s->nqps; i < 3; i++)
1737 s->qps[i] = -1;
1738
1739 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1740 av_log(s->avctx, AV_LOG_INFO, " VP3 %sframe #%d: Q index = %d\n",
1741 s->keyframe?"key":"", counter, s->qps[0]);
1742 counter++;
1743
1744 if (s->qps[0] != s->last_qps[0])
1745 init_loop_filter(s);
1746
1747 for (i = 0; i < s->nqps; i++)
1748 // reinit all dequantizers if the first one changed, because
1749 // the DC of the first quantizer must be used for all matrices
1750 if (s->qps[i] != s->last_qps[i] || s->qps[0] != s->last_qps[0])
1751 init_dequantizer(s, i);
1752
1753 if (avctx->skip_frame >= AVDISCARD_NONKEY && !s->keyframe)
1754 return buf_size;
1755
1756 s->current_frame.reference = 3;
1757 s->current_frame.pict_type = s->keyframe ? FF_I_TYPE : FF_P_TYPE;
1758 if (avctx->get_buffer(avctx, &s->current_frame) < 0) {
1759 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
1760 goto error;
1761 }
1762
1763 if (s->keyframe) {
1764 if (!s->theora)
1765 {
1766 skip_bits(&gb, 4); /* width code */
1767 skip_bits(&gb, 4); /* height code */
1768 if (s->version)
1769 {
1770 s->version = get_bits(&gb, 5);
1771 if (counter == 1)
1772 av_log(s->avctx, AV_LOG_DEBUG, "VP version: %d\n", s->version);
1773 }
1774 }
1775 if (s->version || s->theora)
1776 {
1777 if (get_bits1(&gb))
1778 av_log(s->avctx, AV_LOG_ERROR, "Warning, unsupported keyframe coding type?!\n");
1779 skip_bits(&gb, 2); /* reserved? */
1780 }
1781 } else {
1782 if (!s->golden_frame.data[0]) {
1783 av_log(s->avctx, AV_LOG_WARNING, "vp3: first frame not a keyframe\n");
1784
1785 s->golden_frame.reference = 3;
1786 s->golden_frame.pict_type = FF_I_TYPE;
1787 if (avctx->get_buffer(avctx, &s->golden_frame) < 0) {
1788 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
1789 goto error;
1790 }
1791 s->last_frame = s->golden_frame;
1792 s->last_frame.type = FF_BUFFER_TYPE_COPY;
1793 }
1794 }
1795
1796 s->current_frame.qscale_table= s->qscale_table; //FIXME allocate individual tables per AVFrame
1797 s->current_frame.qstride= 0;
1798
1799 memset(s->all_fragments, 0, s->fragment_count * sizeof(Vp3Fragment));
1800
1801 if (unpack_superblocks(s, &gb)){
1802 av_log(s->avctx, AV_LOG_ERROR, "error in unpack_superblocks\n");
1803 goto error;
1804 }
1805 if (unpack_modes(s, &gb)){
1806 av_log(s->avctx, AV_LOG_ERROR, "error in unpack_modes\n");
1807 goto error;
1808 }
1809 if (unpack_vectors(s, &gb)){
1810 av_log(s->avctx, AV_LOG_ERROR, "error in unpack_vectors\n");
1811 goto error;
1812 }
1813 if (unpack_block_qpis(s, &gb)){
1814 av_log(s->avctx, AV_LOG_ERROR, "error in unpack_block_qpis\n");
1815 goto error;
1816 }
1817 if (unpack_dct_coeffs(s, &gb)){
1818 av_log(s->avctx, AV_LOG_ERROR, "error in unpack_dct_coeffs\n");
1819 goto error;
1820 }
1821
1822 for (i = 0; i < 3; i++) {
1823 int height = s->height >> (i && s->chroma_y_shift);
1824 if (s->flipped_image)
1825 s->data_offset[i] = 0;
1826 else
1827 s->data_offset[i] = (height-1) * s->current_frame.linesize[i];
1828 }
1829
1830 s->last_slice_end = 0;
1831 for (i = 0; i < s->c_superblock_height; i++)
1832 render_slice(s, i);
1833
1834 // filter the last row
1835 for (i = 0; i < 3; i++) {
1836 int row = (s->height >> (3+(i && s->chroma_y_shift))) - 1;
1837 apply_loop_filter(s, i, row, row+1);
1838 }
1839 vp3_draw_horiz_band(s, s->height);
1840
1841 *data_size=sizeof(AVFrame);
1842 *(AVFrame*)data= s->current_frame;
1843
1844 /* release the last frame, if it is allocated and if it is not the
1845 * golden frame */
1846 if (s->last_frame.data[0] && s->last_frame.type != FF_BUFFER_TYPE_COPY)
1847 avctx->release_buffer(avctx, &s->last_frame);
1848
1849 /* shuffle frames (last = current) */
1850 s->last_frame= s->current_frame;
1851
1852 if (s->keyframe) {
1853 if (s->golden_frame.data[0])
1854 avctx->release_buffer(avctx, &s->golden_frame);
1855 s->golden_frame = s->current_frame;
1856 s->last_frame.type = FF_BUFFER_TYPE_COPY;
1857 }
1858
1859 s->current_frame.data[0]= NULL; /* ensure that we catch any access to this released frame */
1860
1861 return buf_size;
1862
1863 error:
1864 if (s->current_frame.data[0])
1865 avctx->release_buffer(avctx, &s->current_frame);
1866 return -1;
1867 }
1868
1869 /*
1870 * This is the ffmpeg/libavcodec API module cleanup function.
1871 */
1872 static av_cold int vp3_decode_end(AVCodecContext *avctx)
1873 {
1874 Vp3DecodeContext *s = avctx->priv_data;
1875 int i;
1876
1877 av_free(s->superblock_coding);
1878 av_free(s->all_fragments);
1879 av_free(s->coded_fragment_list[0]);
1880 av_free(s->dct_tokens_base);
1881 av_free(s->superblock_fragments);
1882 av_free(s->macroblock_coding);
1883 av_free(s->motion_val[0]);
1884 av_free(s->motion_val[1]);
1885
1886 for (i = 0; i < 16; i++) {
1887 free_vlc(&s->dc_vlc[i]);
1888 free_vlc(&s->ac_vlc_1[i]);
1889 free_vlc(&s->ac_vlc_2[i]);
1890 free_vlc(&s->ac_vlc_3[i]);
1891 free_vlc(&s->ac_vlc_4[i]);
1892 }
1893
1894 free_vlc(&s->superblock_run_length_vlc);
1895 free_vlc(&s->fragment_run_length_vlc);
1896 free_vlc(&s->mode_code_vlc);
1897 free_vlc(&s->motion_vector_vlc);
1898
1899 /* release all frames */
1900 if (s->golden_frame.data[0])
1901 avctx->release_buffer(avctx, &s->golden_frame);
1902 if (s->last_frame.data[0] && s->last_frame.type != FF_BUFFER_TYPE_COPY)
1903 avctx->release_buffer(avctx, &s->last_frame);
1904 /* no need to release the current_frame since it will always be pointing
1905 * to the same frame as either the golden or last frame */
1906
1907 return 0;
1908 }
1909
1910 static int read_huffman_tree(AVCodecContext *avctx, GetBitContext *gb)
1911 {
1912 Vp3DecodeContext *s = avctx->priv_data;
1913
1914 if (get_bits1(gb)) {
1915 int token;
1916 if (s->entries >= 32) { /* overflow */
1917 av_log(avctx, AV_LOG_ERROR, "huffman tree overflow\n");
1918 return -1;
1919 }
1920 token = get_bits(gb, 5);
1921 //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);
1922 s->huffman_table[s->hti][token][0] = s->hbits;
1923 s->huffman_table[s->hti][token][1] = s->huff_code_size;
1924 s->entries++;
1925 }
1926 else {
1927 if (s->huff_code_size >= 32) {/* overflow */
1928 av_log(avctx, AV_LOG_ERROR, "huffman tree overflow\n");
1929 return -1;
1930 }
1931 s->huff_code_size++;
1932 s->hbits <<= 1;
1933 if (read_huffman_tree(avctx, gb))
1934 return -1;
1935 s->hbits |= 1;
1936 if (read_huffman_tree(avctx, gb))
1937 return -1;
1938 s->hbits >>= 1;
1939 s->huff_code_size--;
1940 }
1941 return 0;
1942 }
1943
1944 #if CONFIG_THEORA_DECODER
1945 static const enum PixelFormat theora_pix_fmts[4] = {
1946 PIX_FMT_YUV420P, PIX_FMT_NONE, PIX_FMT_YUV422P, PIX_FMT_YUV444P
1947 };
1948
1949 static int theora_decode_header(AVCodecContext *avctx, GetBitContext *gb)
1950 {
1951 Vp3DecodeContext *s = avctx->priv_data;
1952 int visible_width, visible_height, colorspace;
1953
1954 s->theora = get_bits_long(gb, 24);
1955 av_log(avctx, AV_LOG_DEBUG, "Theora bitstream version %X\n", s->theora);
1956
1957 /* 3.2.0 aka alpha3 has the same frame orientation as original vp3 */
1958 /* but previous versions have the image flipped relative to vp3 */
1959 if (s->theora < 0x030200)
1960 {
1961 s->flipped_image = 1;
1962 av_log(avctx, AV_LOG_DEBUG, "Old (<alpha3) Theora bitstream, flipped image\n");
1963 }
1964
1965 visible_width = s->width = get_bits(gb, 16) << 4;
1966 visible_height = s->height = get_bits(gb, 16) << 4;
1967
1968 if(avcodec_check_dimensions(avctx, s->width, s->height)){
1969 av_log(avctx, AV_LOG_ERROR, "Invalid dimensions (%dx%d)\n", s->width, s->height);
1970 s->width= s->height= 0;
1971 return -1;
1972 }
1973
1974 if (s->theora >= 0x030200) {
1975 visible_width = get_bits_long(gb, 24);
1976 visible_height = get_bits_long(gb, 24);
1977
1978 skip_bits(gb, 8); /* offset x */
1979 skip_bits(gb, 8); /* offset y */
1980 }
1981
1982 skip_bits(gb, 32); /* fps numerator */
1983 skip_bits(gb, 32); /* fps denumerator */
1984 skip_bits(gb, 24); /* aspect numerator */
1985 skip_bits(gb, 24); /* aspect denumerator */
1986
1987 if (s->theora < 0x030200)
1988 skip_bits(gb, 5); /* keyframe frequency force */
1989 colorspace = get_bits(gb, 8);
1990 skip_bits(gb, 24); /* bitrate */
1991
1992 skip_bits(gb, 6); /* quality hint */
1993
1994 if (s->theora >= 0x030200)
1995 {
1996 skip_bits(gb, 5); /* keyframe frequency force */
1997 avctx->pix_fmt = theora_pix_fmts[get_bits(gb, 2)];
1998 skip_bits(gb, 3); /* reserved */
1999 }
2000
2001 // align_get_bits(gb);
2002
2003 if ( visible_width <= s->width && visible_width > s->width-16
2004 && visible_height <= s->height && visible_height > s->height-16)
2005 avcodec_set_dimensions(avctx, visible_width, visible_height);
2006 else
2007 avcodec_set_dimensions(avctx, s->width, s->height);
2008
2009 if (colorspace == 1) {
2010 avctx->color_primaries = AVCOL_PRI_BT470M;
2011 } else if (colorspace == 2) {
2012 avctx->color_primaries = AVCOL_PRI_BT470BG;
2013 }
2014 if (colorspace == 1 || colorspace == 2) {
2015 avctx->colorspace = AVCOL_SPC_BT470BG;
2016 avctx->color_trc = AVCOL_TRC_BT709;
2017 }
2018
2019 return 0;
2020 }
2021
2022 static int theora_decode_tables(AVCodecContext *avctx, GetBitContext *gb)
2023 {
2024 Vp3DecodeContext *s = avctx->priv_data;
2025 int i, n, matrices, inter, plane;
2026
2027 if (s->theora >= 0x030200) {
2028 n = get_bits(gb, 3);
2029 /* loop filter limit values table */
2030 for (i = 0; i < 64; i++) {
2031 s->filter_limit_values[i] = get_bits(gb, n);
2032 if (s->filter_limit_values[i] > 127) {
2033 av_log(avctx, AV_LOG_ERROR, "filter limit value too large (%i > 127), clamping\n", s->filter_limit_values[i]);
2034 s->filter_limit_values[i] = 127;
2035 }
2036 }
2037 }
2038
2039 if (s->theora >= 0x030200)
2040 n = get_bits(gb, 4) + 1;
2041 else
2042 n = 16;
2043 /* quality threshold table */
2044 for (i = 0; i < 64; i++)
2045 s->coded_ac_scale_factor[i] = get_bits(gb, n);
2046
2047 if (s->theora >= 0x030200)
2048 n = get_bits(gb, 4) + 1;
2049 else
2050 n = 16;
2051 /* dc scale factor table */
2052 for (i = 0; i < 64; i++)
2053 s->coded_dc_scale_factor[i] = get_bits(gb, n);
2054
2055 if (s->theora >= 0x030200)
2056 matrices = get_bits(gb, 9) + 1;
2057 else
2058 matrices = 3;
2059
2060 if(matrices > 384){
2061 av_log(avctx, AV_LOG_ERROR, "invalid number of base matrixes\n");
2062 return -1;
2063 }
2064
2065 for(n=0; n<matrices; n++){
2066 for (i = 0; i < 64; i++)
2067 s->base_matrix[n][i]= get_bits(gb, 8);
2068 }
2069
2070 for (inter = 0; inter <= 1; inter++) {
2071 for (plane = 0; plane <= 2; plane++) {
2072 int newqr= 1;
2073 if (inter || plane > 0)
2074 newqr = get_bits1(gb);
2075 if (!newqr) {
2076 int qtj, plj;
2077 if(inter && get_bits1(gb)){
2078 qtj = 0;
2079 plj = plane;
2080 }else{
2081 qtj= (3*inter + plane - 1) / 3;
2082 plj= (plane + 2) % 3;
2083 }
2084 s->qr_count[inter][plane]= s->qr_count[qtj][plj];
2085 memcpy(s->qr_size[inter][plane], s->qr_size[qtj][plj], sizeof(s->qr_size[0][0]));
2086 memcpy(s->qr_base[inter][plane], s->qr_base[qtj][plj], sizeof(s->qr_base[0][0]));
2087 } else {
2088 int qri= 0;
2089 int qi = 0;
2090
2091 for(;;){
2092 i= get_bits(gb, av_log2(matrices-1)+1);
2093 if(i>= matrices){
2094 av_log(avctx, AV_LOG_ERROR, "invalid base matrix index\n");
2095 return -1;
2096 }
2097 s->qr_base[inter][plane][qri]= i;
2098 if(qi >= 63)
2099 break;
2100 i = get_bits(gb, av_log2(63-qi)+1) + 1;
2101 s->qr_size[inter][plane][qri++]= i;
2102 qi += i;
2103 }
2104
2105 if (qi > 63) {
2106 av_log(avctx, AV_LOG_ERROR, "invalid qi %d > 63\n", qi);
2107 return -1;
2108 }
2109 s->qr_count[inter][plane]= qri;
2110 }
2111 }
2112 }
2113
2114 /* Huffman tables */
2115 for (s->hti = 0; s->hti < 80; s->hti++) {
2116 s->entries = 0;
2117 s->huff_code_size = 1;
2118 if (!get_bits1(gb)) {
2119 s->hbits = 0;
2120 if(read_huffman_tree(avctx, gb))
2121 return -1;
2122 s->hbits = 1;
2123 if(read_huffman_tree(avctx, gb))
2124 return -1;
2125 }
2126 }
2127
2128 s->theora_tables = 1;
2129
2130 return 0;
2131 }
2132
2133 static av_cold int theora_decode_init(AVCodecContext *avctx)
2134 {
2135 Vp3DecodeContext *s = avctx->priv_data;
2136 GetBitContext gb;
2137 int ptype;
2138 uint8_t *header_start[3];
2139 int header_len[3];
2140 int i;
2141
2142 s->theora = 1;
2143
2144 if (!avctx->extradata_size)
2145 {
2146 av_log(avctx, AV_LOG_ERROR, "Missing extradata!\n");
2147 return -1;
2148 }
2149
2150 if (ff_split_xiph_headers(avctx->extradata, avctx->extradata_size,
2151 42, header_start, header_len) < 0) {
2152 av_log(avctx, AV_LOG_ERROR, "Corrupt extradata\n");
2153 return -1;
2154 }
2155
2156 for(i=0;i<3;i++) {
2157 init_get_bits(&gb, header_start[i], header_len[i] * 8);
2158
2159 ptype = get_bits(&gb, 8);
2160
2161 if (!(ptype & 0x80))
2162 {
2163 av_log(avctx, AV_LOG_ERROR, "Invalid extradata!\n");
2164 // return -1;
2165 }
2166
2167 // FIXME: Check for this as well.
2168 skip_bits_long(&gb, 6*8); /* "theora" */
2169
2170 switch(ptype)
2171 {
2172 case 0x80:
2173 theora_decode_header(avctx, &gb);
2174 break;
2175 case 0x81:
2176 // FIXME: is this needed? it breaks sometimes
2177 // theora_decode_comments(avctx, gb);
2178 break;
2179 case 0x82:
2180 if (theora_decode_tables(avctx, &gb))
2181 return -1;
2182 break;
2183 default:
2184 av_log(avctx, AV_LOG_ERROR, "Unknown Theora config packet: %d\n", ptype&~0x80);
2185 break;
2186 }
2187 if(ptype != 0x81 && 8*header_len[i] != get_bits_count(&gb))
2188 av_log(avctx, AV_LOG_WARNING, "%d bits left in packet %X\n", 8*header_len[i] - get_bits_count(&gb), ptype);
2189 if (s->theora < 0x030200)
2190 break;
2191 }
2192
2193 return vp3_decode_init(avctx);
2194 }
2195
2196 AVCodec theora_decoder = {
2197 "theora",
2198 AVMEDIA_TYPE_VIDEO,
2199 CODEC_ID_THEORA,
2200 sizeof(Vp3DecodeContext),
2201 theora_decode_init,
2202 NULL,
2203 vp3_decode_end,
2204 vp3_decode_frame,
2205 CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND,
2206 NULL,
2207 .long_name = NULL_IF_CONFIG_SMALL("Theora"),
2208 };
2209 #endif
2210
2211 AVCodec vp3_decoder = {
2212 "vp3",
2213 AVMEDIA_TYPE_VIDEO,
2214 CODEC_ID_VP3,
2215 sizeof(Vp3DecodeContext),
2216 vp3_decode_init,
2217 NULL,
2218 vp3_decode_end,
2219 vp3_decode_frame,
2220 CODEC_CAP_DR1 | CODEC_CAP_DRAW_HORIZ_BAND,
2221 NULL,
2222 .long_name = NULL_IF_CONFIG_SMALL("On2 VP3"),
2223 };