Eliminate some repeated dereferences in VP8 inter_predict
[libav.git] / libavcodec / vp8.c
CommitLineData
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1/**
2 * VP8 compatible video decoder
3 *
4 * Copyright (C) 2010 David Conrad
5 * Copyright (C) 2010 Ronald S. Bultje
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include "avcodec.h"
25#include "vp56.h"
26#include "vp8data.h"
27#include "vp8dsp.h"
28#include "h264pred.h"
29#include "rectangle.h"
30
31typedef struct {
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32 uint8_t filter_level;
33 uint8_t inner_limit;
c55e0d34 34 uint8_t inner_filter;
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35} VP8FilterStrength;
36
37typedef struct {
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38 uint8_t skip;
39 // todo: make it possible to check for at least (i4x4 or split_mv)
40 // in one op. are others needed?
41 uint8_t mode;
42 uint8_t ref_frame;
43 uint8_t partitioning;
44 VP56mv mv;
45 VP56mv bmv[16];
46} VP8Macroblock;
47
48typedef struct {
49 AVCodecContext *avctx;
50 DSPContext dsp;
51 VP8DSPContext vp8dsp;
52 H264PredContext hpc;
0ef1dbed 53 vp8_mc_func put_pixels_tab[3][3][3];
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54 AVFrame frames[4];
55 AVFrame *framep[4];
56 uint8_t *edge_emu_buffer;
57 VP56RangeCoder c; ///< header context, includes mb modes and motion vectors
58 int profile;
59
60 int mb_width; /* number of horizontal MB */
61 int mb_height; /* number of vertical MB */
62 int linesize;
63 int uvlinesize;
64
65 int keyframe;
66 int invisible;
67 int update_last; ///< update VP56_FRAME_PREVIOUS with the current one
68 int update_golden; ///< VP56_FRAME_NONE if not updated, or which frame to copy if so
69 int update_altref;
9ac831c2 70 int deblock_filter;
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71
72 /**
73 * If this flag is not set, all the probability updates
74 * are discarded after this frame is decoded.
75 */
76 int update_probabilities;
77
78 /**
79 * All coefficients are contained in separate arith coding contexts.
80 * There can be 1, 2, 4, or 8 of these after the header context.
81 */
82 int num_coeff_partitions;
83 VP56RangeCoder coeff_partition[8];
84
85 VP8Macroblock *macroblocks;
86 VP8Macroblock *macroblocks_base;
968570d6 87 VP8FilterStrength *filter_strength;
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88 int mb_stride;
89
90 uint8_t *intra4x4_pred_mode;
91 uint8_t *intra4x4_pred_mode_base;
c55e0d34 92 uint8_t *segmentation_map;
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93 int b4_stride;
94
95 /**
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96 * Cache of the top row needed for intra prediction
97 * 16 for luma, 8 for each chroma plane
98 */
99 uint8_t (*top_border)[16+8+8];
100
101 /**
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102 * For coeff decode, we need to know whether the above block had non-zero
103 * coefficients. This means for each macroblock, we need data for 4 luma
104 * blocks, 2 u blocks, 2 v blocks, and the luma dc block, for a total of 9
105 * per macroblock. We keep the last row in top_nnz.
106 */
107 uint8_t (*top_nnz)[9];
108 DECLARE_ALIGNED(8, uint8_t, left_nnz)[9];
109
110 /**
111 * This is the index plus one of the last non-zero coeff
112 * for each of the blocks in the current macroblock.
113 * So, 0 -> no coeffs
114 * 1 -> dc-only (special transform)
115 * 2+-> full transform
116 */
117 DECLARE_ALIGNED(16, uint8_t, non_zero_count_cache)[6][4];
118 DECLARE_ALIGNED(16, DCTELEM, block)[6][4][16];
d1c58fce 119 uint8_t intra4x4_pred_mode_mb[16];
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120
121 int chroma_pred_mode; ///< 8x8c pred mode of the current macroblock
b9a7186b 122 int segment; ///< segment of the current macroblock
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123
124 int mbskip_enabled;
125 int sign_bias[4]; ///< one state [0, 1] per ref frame type
126
127 /**
128 * Base parameters for segmentation, i.e. per-macroblock parameters.
129 * These must be kept unchanged even if segmentation is not used for
130 * a frame, since the values persist between interframes.
131 */
132 struct {
133 int enabled;
134 int absolute_vals;
135 int update_map;
136 int8_t base_quant[4];
137 int8_t filter_level[4]; ///< base loop filter level
138 } segmentation;
139
140 /**
141 * Macroblocks can have one of 4 different quants in a frame when
142 * segmentation is enabled.
143 * If segmentation is disabled, only the first segment's values are used.
144 */
145 struct {
146 // [0] - DC qmul [1] - AC qmul
147 int16_t luma_qmul[2];
148 int16_t luma_dc_qmul[2]; ///< luma dc-only block quant
149 int16_t chroma_qmul[2];
150 } qmat[4];
151
152 struct {
153 int simple;
154 int level;
155 int sharpness;
156 } filter;
157
158 struct {
159 int enabled; ///< whether each mb can have a different strength based on mode/ref
160
161 /**
162 * filter strength adjustment for the following macroblock modes:
163 * [0] - i4x4
164 * [1] - zero mv
165 * [2] - inter modes except for zero or split mv
166 * [3] - split mv
167 * i16x16 modes never have any adjustment
168 */
169 int8_t mode[4];
170
171 /**
172 * filter strength adjustment for macroblocks that reference:
173 * [0] - intra / VP56_FRAME_CURRENT
174 * [1] - VP56_FRAME_PREVIOUS
175 * [2] - VP56_FRAME_GOLDEN
176 * [3] - altref / VP56_FRAME_GOLDEN2
177 */
178 int8_t ref[4];
179 } lf_delta;
180
181 /**
182 * These are all of the updatable probabilities for binary decisions.
183 * They are only implictly reset on keyframes, making it quite likely
184 * for an interframe to desync if a prior frame's header was corrupt
185 * or missing outright!
186 */
187 struct {
188 uint8_t segmentid[3];
189 uint8_t mbskip;
190 uint8_t intra;
191 uint8_t last;
192 uint8_t golden;
193 uint8_t pred16x16[4];
194 uint8_t pred8x8c[3];
195 uint8_t token[4][8][3][NUM_DCT_TOKENS-1];
196 uint8_t mvc[2][19];
197 } prob[2];
198} VP8Context;
199
200#define RL24(p) (AV_RL16(p) + ((p)[2] << 16))
201
202static void vp8_decode_flush(AVCodecContext *avctx)
203{
204 VP8Context *s = avctx->priv_data;
205 int i;
206
207 for (i = 0; i < 4; i++)
208 if (s->frames[i].data[0])
209 avctx->release_buffer(avctx, &s->frames[i]);
210 memset(s->framep, 0, sizeof(s->framep));
211
212 av_freep(&s->macroblocks_base);
213 av_freep(&s->intra4x4_pred_mode_base);
214 av_freep(&s->top_nnz);
215 av_freep(&s->edge_emu_buffer);
9ac831c2 216 av_freep(&s->top_border);
c55e0d34 217 av_freep(&s->segmentation_map);
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218
219 s->macroblocks = NULL;
220 s->intra4x4_pred_mode = NULL;
221}
222
223static int update_dimensions(VP8Context *s, int width, int height)
224{
225 int i;
226
227 if (avcodec_check_dimensions(s->avctx, width, height))
228 return AVERROR_INVALIDDATA;
229
230 vp8_decode_flush(s->avctx);
231
232 avcodec_set_dimensions(s->avctx, width, height);
233
234 s->mb_width = (s->avctx->coded_width +15) / 16;
235 s->mb_height = (s->avctx->coded_height+15) / 16;
236
237 // we allocate a border around the top/left of intra4x4 modes
238 // this is 4 blocks for intra4x4 to keep 4-byte alignment for fill_rectangle
239 s->mb_stride = s->mb_width+1;
240 s->b4_stride = 4*s->mb_stride;
241
c55e0d34 242 s->macroblocks_base = av_mallocz((s->mb_stride+s->mb_height*2+2)*sizeof(*s->macroblocks));
968570d6 243 s->filter_strength = av_mallocz(s->mb_stride*sizeof(*s->filter_strength));
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244 s->intra4x4_pred_mode_base = av_mallocz(s->b4_stride*(4*s->mb_height+1));
245 s->top_nnz = av_mallocz(s->mb_width*sizeof(*s->top_nnz));
9ac831c2 246 s->top_border = av_mallocz((s->mb_width+1)*sizeof(*s->top_border));
c55e0d34 247 s->segmentation_map = av_mallocz(s->mb_stride*s->mb_height);
3b636f21 248
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249 if (!s->macroblocks_base || !s->filter_strength || !s->intra4x4_pred_mode_base ||
250 !s->top_nnz || !s->top_border || !s->segmentation_map)
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251 return AVERROR(ENOMEM);
252
c55e0d34 253 s->macroblocks = s->macroblocks_base + 1;
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254 s->intra4x4_pred_mode = s->intra4x4_pred_mode_base + 4 + s->b4_stride;
255
256 memset(s->intra4x4_pred_mode_base, DC_PRED, s->b4_stride);
257 for (i = 0; i < 4*s->mb_height; i++)
258 s->intra4x4_pred_mode[i*s->b4_stride-1] = DC_PRED;
259
260 return 0;
261}
262
263static void parse_segment_info(VP8Context *s)
264{
265 VP56RangeCoder *c = &s->c;
266 int i;
267
268 s->segmentation.update_map = vp8_rac_get(c);
269
270 if (vp8_rac_get(c)) { // update segment feature data
271 s->segmentation.absolute_vals = vp8_rac_get(c);
272
273 for (i = 0; i < 4; i++)
274 s->segmentation.base_quant[i] = vp8_rac_get_sint(c, 7);
275
276 for (i = 0; i < 4; i++)
277 s->segmentation.filter_level[i] = vp8_rac_get_sint(c, 6);
278 }
279 if (s->segmentation.update_map)
280 for (i = 0; i < 3; i++)
281 s->prob->segmentid[i] = vp8_rac_get(c) ? vp8_rac_get_uint(c, 8) : 255;
282}
283
284static void update_lf_deltas(VP8Context *s)
285{
286 VP56RangeCoder *c = &s->c;
287 int i;
288
289 for (i = 0; i < 4; i++)
290 s->lf_delta.ref[i] = vp8_rac_get_sint(c, 6);
291
292 for (i = 0; i < 4; i++)
293 s->lf_delta.mode[i] = vp8_rac_get_sint(c, 6);
294}
295
296static int setup_partitions(VP8Context *s, const uint8_t *buf, int buf_size)
297{
298 const uint8_t *sizes = buf;
299 int i;
300
301 s->num_coeff_partitions = 1 << vp8_rac_get_uint(&s->c, 2);
302
303 buf += 3*(s->num_coeff_partitions-1);
304 buf_size -= 3*(s->num_coeff_partitions-1);
305 if (buf_size < 0)
306 return -1;
307
308 for (i = 0; i < s->num_coeff_partitions-1; i++) {
309 int size = RL24(sizes + 3*i);
310 if (buf_size - size < 0)
311 return -1;
312
313 vp56_init_range_decoder(&s->coeff_partition[i], buf, size);
314 buf += size;
315 buf_size -= size;
316 }
317 vp56_init_range_decoder(&s->coeff_partition[i], buf, buf_size);
318
319 return 0;
320}
321
322static void get_quants(VP8Context *s)
323{
324 VP56RangeCoder *c = &s->c;
325 int i, base_qi;
326
327 int yac_qi = vp8_rac_get_uint(c, 7);
328 int ydc_delta = vp8_rac_get_sint(c, 4);
329 int y2dc_delta = vp8_rac_get_sint(c, 4);
330 int y2ac_delta = vp8_rac_get_sint(c, 4);
331 int uvdc_delta = vp8_rac_get_sint(c, 4);
332 int uvac_delta = vp8_rac_get_sint(c, 4);
333
334 for (i = 0; i < 4; i++) {
335 if (s->segmentation.enabled) {
336 base_qi = s->segmentation.base_quant[i];
337 if (!s->segmentation.absolute_vals)
338 base_qi += yac_qi;
339 } else
340 base_qi = yac_qi;
341
342 s->qmat[i].luma_qmul[0] = vp8_dc_qlookup[av_clip(base_qi + ydc_delta , 0, 127)];
343 s->qmat[i].luma_qmul[1] = vp8_ac_qlookup[av_clip(base_qi , 0, 127)];
344 s->qmat[i].luma_dc_qmul[0] = 2 * vp8_dc_qlookup[av_clip(base_qi + y2dc_delta, 0, 127)];
345 s->qmat[i].luma_dc_qmul[1] = 155 * vp8_ac_qlookup[av_clip(base_qi + y2ac_delta, 0, 127)] / 100;
346 s->qmat[i].chroma_qmul[0] = vp8_dc_qlookup[av_clip(base_qi + uvdc_delta, 0, 127)];
347 s->qmat[i].chroma_qmul[1] = vp8_ac_qlookup[av_clip(base_qi + uvac_delta, 0, 127)];
348
349 s->qmat[i].luma_dc_qmul[1] = FFMAX(s->qmat[i].luma_dc_qmul[1], 8);
350 s->qmat[i].chroma_qmul[0] = FFMIN(s->qmat[i].chroma_qmul[0], 132);
351 }
352}
353
354/**
355 * Determine which buffers golden and altref should be updated with after this frame.
356 * The spec isn't clear here, so I'm going by my understanding of what libvpx does
357 *
358 * Intra frames update all 3 references
359 * Inter frames update VP56_FRAME_PREVIOUS if the update_last flag is set
360 * If the update (golden|altref) flag is set, it's updated with the current frame
361 * if update_last is set, and VP56_FRAME_PREVIOUS otherwise.
362 * If the flag is not set, the number read means:
363 * 0: no update
364 * 1: VP56_FRAME_PREVIOUS
365 * 2: update golden with altref, or update altref with golden
366 */
367static VP56Frame ref_to_update(VP8Context *s, int update, VP56Frame ref)
368{
369 VP56RangeCoder *c = &s->c;
370
371 if (update)
372 return VP56_FRAME_CURRENT;
373
374 switch (vp8_rac_get_uint(c, 2)) {
375 case 1:
376 return VP56_FRAME_PREVIOUS;
377 case 2:
378 return (ref == VP56_FRAME_GOLDEN) ? VP56_FRAME_GOLDEN2 : VP56_FRAME_GOLDEN;
379 }
380 return VP56_FRAME_NONE;
381}
382
383static void update_refs(VP8Context *s)
384{
385 VP56RangeCoder *c = &s->c;
386
387 int update_golden = vp8_rac_get(c);
388 int update_altref = vp8_rac_get(c);
389
390 s->update_golden = ref_to_update(s, update_golden, VP56_FRAME_GOLDEN);
391 s->update_altref = ref_to_update(s, update_altref, VP56_FRAME_GOLDEN2);
392}
393
394static int decode_frame_header(VP8Context *s, const uint8_t *buf, int buf_size)
395{
396 VP56RangeCoder *c = &s->c;
397 int header_size, hscale, vscale, i, j, k, l, ret;
398 int width = s->avctx->width;
399 int height = s->avctx->height;
400
401 s->keyframe = !(buf[0] & 1);
402 s->profile = (buf[0]>>1) & 7;
403 s->invisible = !(buf[0] & 0x10);
404 header_size = RL24(buf) >> 5;
405 buf += 3;
406 buf_size -= 3;
407
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DC
408 if (s->profile > 3)
409 av_log(s->avctx, AV_LOG_WARNING, "Unknown profile %d\n", s->profile);
410
411 if (!s->profile)
412 memcpy(s->put_pixels_tab, s->vp8dsp.put_vp8_epel_pixels_tab, sizeof(s->put_pixels_tab));
413 else // profile 1-3 use bilinear, 4+ aren't defined so whatever
414 memcpy(s->put_pixels_tab, s->vp8dsp.put_vp8_bilinear_pixels_tab, sizeof(s->put_pixels_tab));
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415
416 if (header_size > buf_size - 7*s->keyframe) {
417 av_log(s->avctx, AV_LOG_ERROR, "Header size larger than data provided\n");
418 return AVERROR_INVALIDDATA;
419 }
420
421 if (s->keyframe) {
422 if (RL24(buf) != 0x2a019d) {
423 av_log(s->avctx, AV_LOG_ERROR, "Invalid start code 0x%x\n", RL24(buf));
424 return AVERROR_INVALIDDATA;
425 }
426 width = AV_RL16(buf+3) & 0x3fff;
427 height = AV_RL16(buf+5) & 0x3fff;
428 hscale = buf[4] >> 6;
429 vscale = buf[6] >> 6;
430 buf += 7;
431 buf_size -= 7;
432
92a54426
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433 if (hscale || vscale)
434 av_log_missing_feature(s->avctx, "Upscaling", 1);
435
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436 s->update_golden = s->update_altref = VP56_FRAME_CURRENT;
437 memcpy(s->prob->token , vp8_token_default_probs , sizeof(s->prob->token));
438 memcpy(s->prob->pred16x16, vp8_pred16x16_prob_inter, sizeof(s->prob->pred16x16));
439 memcpy(s->prob->pred8x8c , vp8_pred8x8c_prob_inter , sizeof(s->prob->pred8x8c));
440 memcpy(s->prob->mvc , vp8_mv_default_prob , sizeof(s->prob->mvc));
441 memset(&s->segmentation, 0, sizeof(s->segmentation));
442 }
443
444 if (!s->macroblocks_base || /* first frame */
445 width != s->avctx->width || height != s->avctx->height) {
446 if ((ret = update_dimensions(s, width, height) < 0))
447 return ret;
448 }
449
450 vp56_init_range_decoder(c, buf, header_size);
451 buf += header_size;
452 buf_size -= header_size;
453
454 if (s->keyframe) {
455 if (vp8_rac_get(c))
456 av_log(s->avctx, AV_LOG_WARNING, "Unspecified colorspace\n");
457 vp8_rac_get(c); // whether we can skip clamping in dsp functions
458 }
459
460 if ((s->segmentation.enabled = vp8_rac_get(c)))
461 parse_segment_info(s);
462 else
463 s->segmentation.update_map = 0; // FIXME: move this to some init function?
464
465 s->filter.simple = vp8_rac_get(c);
466 s->filter.level = vp8_rac_get_uint(c, 6);
467 s->filter.sharpness = vp8_rac_get_uint(c, 3);
468
469 if ((s->lf_delta.enabled = vp8_rac_get(c)))
470 if (vp8_rac_get(c))
471 update_lf_deltas(s);
472
473 if (setup_partitions(s, buf, buf_size)) {
474 av_log(s->avctx, AV_LOG_ERROR, "Invalid partitions\n");
475 return AVERROR_INVALIDDATA;
476 }
477
478 get_quants(s);
479
480 if (!s->keyframe) {
481 update_refs(s);
482 s->sign_bias[VP56_FRAME_GOLDEN] = vp8_rac_get(c);
483 s->sign_bias[VP56_FRAME_GOLDEN2 /* altref */] = vp8_rac_get(c);
484 }
485
486 // if we aren't saving this frame's probabilities for future frames,
487 // make a copy of the current probabilities
488 if (!(s->update_probabilities = vp8_rac_get(c)))
489 s->prob[1] = s->prob[0];
490
491 s->update_last = s->keyframe || vp8_rac_get(c);
492
493 for (i = 0; i < 4; i++)
494 for (j = 0; j < 8; j++)
495 for (k = 0; k < 3; k++)
496 for (l = 0; l < NUM_DCT_TOKENS-1; l++)
497 if (vp56_rac_get_prob(c, vp8_token_update_probs[i][j][k][l]))
498 s->prob->token[i][j][k][l] = vp8_rac_get_uint(c, 8);
499
500 if ((s->mbskip_enabled = vp8_rac_get(c)))
501 s->prob->mbskip = vp8_rac_get_uint(c, 8);
502
503 if (!s->keyframe) {
504 s->prob->intra = vp8_rac_get_uint(c, 8);
505 s->prob->last = vp8_rac_get_uint(c, 8);
506 s->prob->golden = vp8_rac_get_uint(c, 8);
507
508 if (vp8_rac_get(c))
509 for (i = 0; i < 4; i++)
510 s->prob->pred16x16[i] = vp8_rac_get_uint(c, 8);
511 if (vp8_rac_get(c))
512 for (i = 0; i < 3; i++)
513 s->prob->pred8x8c[i] = vp8_rac_get_uint(c, 8);
514
515 // 17.2 MV probability update
516 for (i = 0; i < 2; i++)
517 for (j = 0; j < 19; j++)
518 if (vp56_rac_get_prob(c, vp8_mv_update_prob[i][j]))
519 s->prob->mvc[i][j] = vp8_rac_get_nn(c);
520 }
521
522 return 0;
523}
524
525static inline void clamp_mv(VP8Context *s, VP56mv *dst, const VP56mv *src,
526 int mb_x, int mb_y)
527{
528#define MARGIN (16 << 2)
529 dst->x = av_clip(src->x, -((mb_x << 6) + MARGIN),
530 ((s->mb_width - 1 - mb_x) << 6) + MARGIN);
531 dst->y = av_clip(src->y, -((mb_y << 6) + MARGIN),
532 ((s->mb_height - 1 - mb_y) << 6) + MARGIN);
533}
534
535static void find_near_mvs(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y,
702e8d33 536 VP56mv near[2], VP56mv *best, uint8_t cnt[4])
3b636f21 537{
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538 VP8Macroblock *mb_edge[3] = { mb + 2 /* top */,
539 mb - 1 /* left */,
540 mb + 1 /* top-left */ };
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DC
541 enum { EDGE_TOP, EDGE_LEFT, EDGE_TOPLEFT };
542 VP56mv near_mv[4] = {{ 0 }};
543 enum { CNT_ZERO, CNT_NEAREST, CNT_NEAR, CNT_SPLITMV };
702e8d33 544 int idx = CNT_ZERO;
3b636f21 545 int best_idx = CNT_ZERO;
702e8d33
JGG
546 int cur_sign_bias = s->sign_bias[mb->ref_frame];
547 int *sign_bias = s->sign_bias;
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DC
548
549 /* Process MB on top, left and top-left */
702e8d33
JGG
550 #define MV_EDGE_CHECK(n)\
551 {\
552 VP8Macroblock *edge = mb_edge[n];\
553 int edge_ref = edge->ref_frame;\
554 if (edge_ref != VP56_FRAME_CURRENT) {\
555 uint32_t mv = AV_RN32A(&edge->mv);\
556 if (mv) {\
557 if (cur_sign_bias != sign_bias[edge_ref]) {\
558 /* SWAR negate of the values in mv. */\
559 mv = ((mv&0x80008000) + 0x00010001) ^ (mv&0x7fff7fff);\
560 }\
561 if (!n || mv != AV_RN32A(&near_mv[idx]))\
562 AV_WN32A(&near_mv[++idx], mv);\
563 cnt[idx] += 1 + (n != 2);\
564 } else\
565 cnt[CNT_ZERO] += 1 + (n != 2);\
566 }\
3b636f21 567 }
702e8d33
JGG
568 MV_EDGE_CHECK(0)
569 MV_EDGE_CHECK(1)
570 MV_EDGE_CHECK(2)
3b636f21 571
702e8d33
JGG
572 /* If we have three distinct MVs, merge first and last if they're the same */
573 if (cnt[CNT_SPLITMV] && AV_RN32A(&near_mv[1+EDGE_TOP]) == AV_RN32A(&near_mv[1+EDGE_TOPLEFT]))
3b636f21
DC
574 cnt[CNT_NEAREST] += 1;
575
576 cnt[CNT_SPLITMV] = ((mb_edge[EDGE_LEFT]->mode == VP8_MVMODE_SPLIT) +
577 (mb_edge[EDGE_TOP]->mode == VP8_MVMODE_SPLIT)) * 2 +
578 (mb_edge[EDGE_TOPLEFT]->mode == VP8_MVMODE_SPLIT);
579
580 /* Swap near and nearest if necessary */
581 if (cnt[CNT_NEAR] > cnt[CNT_NEAREST]) {
702e8d33
JGG
582 FFSWAP(uint8_t, cnt[CNT_NEAREST], cnt[CNT_NEAR]);
583 FFSWAP( VP56mv, near_mv[CNT_NEAREST], near_mv[CNT_NEAR]);
3b636f21
DC
584 }
585
586 /* Choose the best mv out of 0,0 and the nearest mv */
587 if (cnt[CNT_NEAREST] >= cnt[CNT_ZERO])
588 best_idx = CNT_NEAREST;
589
590 clamp_mv(s, best, &near_mv[best_idx], mb_x, mb_y);
591 near[0] = near_mv[CNT_NEAREST];
592 near[1] = near_mv[CNT_NEAR];
593}
594
595/**
596 * Motion vector coding, 17.1.
597 */
598static int read_mv_component(VP56RangeCoder *c, const uint8_t *p)
599{
600 int x = 0;
601
602 if (vp56_rac_get_prob(c, p[0])) {
603 int i;
604
605 for (i = 0; i < 3; i++)
606 x += vp56_rac_get_prob(c, p[9 + i]) << i;
607 for (i = 9; i > 3; i--)
608 x += vp56_rac_get_prob(c, p[9 + i]) << i;
609 if (!(x & 0xFFF0) || vp56_rac_get_prob(c, p[12]))
610 x += 8;
611 } else
612 x = vp8_rac_get_tree(c, vp8_small_mvtree, &p[2]);
613
614 return (x && vp56_rac_get_prob(c, p[1])) ? -x : x;
615}
616
7bf254c4 617static const uint8_t *get_submv_prob(uint32_t left, uint32_t top)
3b636f21 618{
7bf254c4
JGG
619 if (left == top)
620 return vp8_submv_prob[4-!!left];
621 if (!top)
3b636f21 622 return vp8_submv_prob[2];
7bf254c4 623 return vp8_submv_prob[1-!!left];
3b636f21
DC
624}
625
626/**
627 * Split motion vector prediction, 16.4.
7ed06b2b 628 * @returns the number of motion vectors parsed (2, 4 or 16)
3b636f21 629 */
7ed06b2b 630static int decode_splitmvs(VP8Context *s, VP56RangeCoder *c,
3b636f21
DC
631 VP8Macroblock *mb, VP56mv *base_mv)
632{
633 int part_idx = mb->partitioning =
634 vp8_rac_get_tree(c, vp8_mbsplit_tree, vp8_mbsplit_prob);
635 int n, num = vp8_mbsplit_count[part_idx];
c55e0d34 636 VP8Macroblock *top_mb = &mb[2];
7bf254c4
JGG
637 VP8Macroblock *left_mb = &mb[-1];
638 const uint8_t *mbsplits_left = vp8_mbsplits[left_mb->partitioning],
639 *mbsplits_top = vp8_mbsplits[top_mb->partitioning],
640 *mbsplits_cur = vp8_mbsplits[part_idx],
7ed06b2b 641 *firstidx = vp8_mbfirstidx[part_idx];
c55e0d34
JGG
642 VP56mv *top_mv = top_mb->bmv;
643 VP56mv *left_mv = left_mb->bmv;
644 VP56mv *cur_mv = mb->bmv;
3b636f21
DC
645
646 for (n = 0; n < num; n++) {
7ed06b2b 647 int k = firstidx[n];
7bf254c4 648 uint32_t left, above;
7ed06b2b
RB
649 const uint8_t *submv_prob;
650
7bf254c4
JGG
651 if (!(k & 3))
652 left = AV_RN32A(&left_mv[mbsplits_left[k + 3]]);
653 else
654 left = AV_RN32A(&cur_mv[mbsplits_cur[k - 1]]);
655 if (k <= 3)
656 above = AV_RN32A(&top_mv[mbsplits_top[k + 12]]);
657 else
658 above = AV_RN32A(&cur_mv[mbsplits_cur[k - 4]]);
7ed06b2b
RB
659
660 submv_prob = get_submv_prob(left, above);
3b636f21
DC
661
662 switch (vp8_rac_get_tree(c, vp8_submv_ref_tree, submv_prob)) {
663 case VP8_SUBMVMODE_NEW4X4:
7ed06b2b
RB
664 mb->bmv[n].y = base_mv->y + read_mv_component(c, s->prob->mvc[0]);
665 mb->bmv[n].x = base_mv->x + read_mv_component(c, s->prob->mvc[1]);
3b636f21
DC
666 break;
667 case VP8_SUBMVMODE_ZERO4X4:
7bf254c4 668 AV_WN32A(&mb->bmv[n], 0);
3b636f21
DC
669 break;
670 case VP8_SUBMVMODE_LEFT4X4:
7bf254c4 671 AV_WN32A(&mb->bmv[n], left);
3b636f21
DC
672 break;
673 case VP8_SUBMVMODE_TOP4X4:
7bf254c4 674 AV_WN32A(&mb->bmv[n], above);
3b636f21
DC
675 break;
676 }
3b636f21 677 }
7ed06b2b
RB
678
679 return num;
3b636f21
DC
680}
681
682static inline void decode_intra4x4_modes(VP56RangeCoder *c, uint8_t *intra4x4,
683 int stride, int keyframe)
684{
d1c58fce 685 int x, y, t, l, i;
3b636f21 686
d1c58fce
JGG
687 if (keyframe) {
688 const uint8_t *ctx;
689 for (y = 0; y < 4; y++) {
690 for (x = 0; x < 4; x++) {
3b636f21
DC
691 t = intra4x4[x - stride];
692 l = intra4x4[x - 1];
693 ctx = vp8_pred4x4_prob_intra[t][l];
d1c58fce 694 intra4x4[x] = vp8_rac_get_tree(c, vp8_pred4x4_tree, ctx);
3b636f21 695 }
d1c58fce 696 intra4x4 += stride;
3b636f21 697 }
d1c58fce
JGG
698 } else {
699 for (i = 0; i < 16; i++)
700 intra4x4[i] = vp8_rac_get_tree(c, vp8_pred4x4_tree, vp8_pred4x4_prob_inter);
3b636f21
DC
701 }
702}
703
704static void decode_mb_mode(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y,
c55e0d34 705 uint8_t *intra4x4, uint8_t *segment)
3b636f21
DC
706{
707 VP56RangeCoder *c = &s->c;
3b636f21
DC
708
709 if (s->segmentation.update_map)
c55e0d34 710 *segment = vp8_rac_get_tree(c, vp8_segmentid_tree, s->prob->segmentid);
b9a7186b 711 s->segment = *segment;
3b636f21
DC
712
713 mb->skip = s->mbskip_enabled ? vp56_rac_get_prob(c, s->prob->mbskip) : 0;
714
715 if (s->keyframe) {
716 mb->mode = vp8_rac_get_tree(c, vp8_pred16x16_tree_intra, vp8_pred16x16_prob_intra);
717
718 if (mb->mode == MODE_I4x4) {
719 decode_intra4x4_modes(c, intra4x4, s->b4_stride, 1);
720 } else
721 fill_rectangle(intra4x4, 4, 4, s->b4_stride, vp8_pred4x4_mode[mb->mode], 1);
722
723 s->chroma_pred_mode = vp8_rac_get_tree(c, vp8_pred8x8c_tree, vp8_pred8x8c_prob_intra);
724 mb->ref_frame = VP56_FRAME_CURRENT;
725 } else if (vp56_rac_get_prob(c, s->prob->intra)) {
726 VP56mv near[2], best;
702e8d33 727 uint8_t cnt[4] = { 0 };
3b636f21
DC
728 uint8_t p[4];
729
730 // inter MB, 16.2
731 if (vp56_rac_get_prob(c, s->prob->last))
732 mb->ref_frame = vp56_rac_get_prob(c, s->prob->golden) ?
733 VP56_FRAME_GOLDEN2 /* altref */ : VP56_FRAME_GOLDEN;
734 else
735 mb->ref_frame = VP56_FRAME_PREVIOUS;
736
737 // motion vectors, 16.3
738 find_near_mvs(s, mb, mb_x, mb_y, near, &best, cnt);
702e8d33
JGG
739 p[0] = vp8_mode_contexts[cnt[0]][0];
740 p[1] = vp8_mode_contexts[cnt[1]][1];
741 p[2] = vp8_mode_contexts[cnt[2]][2];
742 p[3] = vp8_mode_contexts[cnt[3]][3];
3b636f21
DC
743 mb->mode = vp8_rac_get_tree(c, vp8_pred16x16_tree_mvinter, p);
744 switch (mb->mode) {
745 case VP8_MVMODE_SPLIT:
7ed06b2b 746 mb->mv = mb->bmv[decode_splitmvs(s, c, mb, &best) - 1];
3b636f21
DC
747 break;
748 case VP8_MVMODE_ZERO:
b946111f 749 AV_WN32A(&mb->mv, 0);
3b636f21
DC
750 break;
751 case VP8_MVMODE_NEAREST:
752 clamp_mv(s, &mb->mv, &near[0], mb_x, mb_y);
753 break;
754 case VP8_MVMODE_NEAR:
755 clamp_mv(s, &mb->mv, &near[1], mb_x, mb_y);
756 break;
757 case VP8_MVMODE_NEW:
758 mb->mv.y = best.y + read_mv_component(c, s->prob->mvc[0]);
759 mb->mv.x = best.x + read_mv_component(c, s->prob->mvc[1]);
760 break;
761 }
762 if (mb->mode != VP8_MVMODE_SPLIT) {
7ed06b2b
RB
763 mb->partitioning = VP8_SPLITMVMODE_NONE;
764 mb->bmv[0] = mb->mv;
3b636f21
DC
765 }
766 } else {
767 // intra MB, 16.1
768 mb->mode = vp8_rac_get_tree(c, vp8_pred16x16_tree_inter, s->prob->pred16x16);
769
158e062c 770 if (mb->mode == MODE_I4x4)
d1c58fce 771 decode_intra4x4_modes(c, intra4x4, 4, 0);
3b636f21
DC
772
773 s->chroma_pred_mode = vp8_rac_get_tree(c, vp8_pred8x8c_tree, s->prob->pred8x8c);
774 mb->ref_frame = VP56_FRAME_CURRENT;
b946111f
JGG
775 mb->partitioning = VP8_SPLITMVMODE_NONE;
776 AV_WN32A(&mb->bmv[0], 0);
3b636f21
DC
777 }
778}
779
780/**
e394953e
RB
781 * @param c arithmetic bitstream reader context
782 * @param block destination for block coefficients
783 * @param probs probabilities to use when reading trees from the bitstream
3b636f21
DC
784 * @param i initial coeff index, 0 unless a separate DC block is coded
785 * @param zero_nhood the initial prediction context for number of surrounding
786 * all-zero blocks (only left/top, so 0-2)
3fa76268 787 * @param qmul array holding the dc/ac dequant factor at position 0/1
3b636f21
DC
788 * @return 0 if no coeffs were decoded
789 * otherwise, the index of the last coeff decoded plus one
790 */
791static int decode_block_coeffs(VP56RangeCoder *c, DCTELEM block[16],
792 uint8_t probs[8][3][NUM_DCT_TOKENS-1],
793 int i, int zero_nhood, int16_t qmul[2])
794{
795 int token, nonzero = 0;
796 int offset = 0;
797
798 for (; i < 16; i++) {
799 token = vp8_rac_get_tree_with_offset(c, vp8_coeff_tree, probs[vp8_coeff_band[i]][zero_nhood], offset);
800
801 if (token == DCT_EOB)
802 break;
803 else if (token >= DCT_CAT1) {
804 int cat = token-DCT_CAT1;
805 token = vp8_rac_get_coeff(c, vp8_dct_cat_prob[cat]);
806 token += vp8_dct_cat_offset[cat];
807 }
808
809 // after the first token, the non-zero prediction context becomes
810 // based on the last decoded coeff
811 if (!token) {
812 zero_nhood = 0;
813 offset = 1;
814 continue;
815 } else if (token == 1)
816 zero_nhood = 1;
817 else
818 zero_nhood = 2;
819
820 // todo: full [16] qmat? load into register?
821 block[zigzag_scan[i]] = (vp8_rac_get(c) ? -token : token) * qmul[!!i];
822 nonzero = i+1;
823 offset = 0;
824 }
825 return nonzero;
826}
827
828static void decode_mb_coeffs(VP8Context *s, VP56RangeCoder *c, VP8Macroblock *mb,
829 uint8_t t_nnz[9], uint8_t l_nnz[9])
830{
831 LOCAL_ALIGNED_16(DCTELEM, dc,[16]);
832 int i, x, y, luma_start = 0, luma_ctx = 3;
833 int nnz_pred, nnz, nnz_total = 0;
b9a7186b 834 int segment = s->segment;
3b636f21
DC
835
836 s->dsp.clear_blocks((DCTELEM *)s->block);
837
838 if (mb->mode != MODE_I4x4 && mb->mode != VP8_MVMODE_SPLIT) {
839 AV_ZERO128(dc);
840 AV_ZERO128(dc+8);
841 nnz_pred = t_nnz[8] + l_nnz[8];
842
843 // decode DC values and do hadamard
844 nnz = decode_block_coeffs(c, dc, s->prob->token[1], 0, nnz_pred,
845 s->qmat[segment].luma_dc_qmul);
846 l_nnz[8] = t_nnz[8] = !!nnz;
847 nnz_total += nnz;
848 s->vp8dsp.vp8_luma_dc_wht(s->block, dc);
849 luma_start = 1;
850 luma_ctx = 0;
851 }
852
853 // luma blocks
854 for (y = 0; y < 4; y++)
855 for (x = 0; x < 4; x++) {
856 nnz_pred = l_nnz[y] + t_nnz[x];
857 nnz = decode_block_coeffs(c, s->block[y][x], s->prob->token[luma_ctx], luma_start,
858 nnz_pred, s->qmat[segment].luma_qmul);
859 // nnz+luma_start may be one more than the actual last index, but we don't care
860 s->non_zero_count_cache[y][x] = nnz + luma_start;
861 t_nnz[x] = l_nnz[y] = !!nnz;
862 nnz_total += nnz;
863 }
864
865 // chroma blocks
866 // TODO: what to do about dimensions? 2nd dim for luma is x,
867 // but for chroma it's (y<<1)|x
868 for (i = 4; i < 6; i++)
869 for (y = 0; y < 2; y++)
870 for (x = 0; x < 2; x++) {
871 nnz_pred = l_nnz[i+2*y] + t_nnz[i+2*x];
872 nnz = decode_block_coeffs(c, s->block[i][(y<<1)+x], s->prob->token[2], 0,
873 nnz_pred, s->qmat[segment].chroma_qmul);
874 s->non_zero_count_cache[i][(y<<1)+x] = nnz;
875 t_nnz[i+2*x] = l_nnz[i+2*y] = !!nnz;
876 nnz_total += nnz;
877 }
878
879 // if there were no coded coeffs despite the macroblock not being marked skip,
880 // we MUST not do the inner loop filter and should not do IDCT
881 // Since skip isn't used for bitstream prediction, just manually set it.
882 if (!nnz_total)
883 mb->skip = 1;
884}
885
9ac831c2
DC
886static av_always_inline
887void backup_mb_border(uint8_t *top_border, uint8_t *src_y, uint8_t *src_cb, uint8_t *src_cr,
888 int linesize, int uvlinesize, int simple)
889{
890 AV_COPY128(top_border, src_y + 15*linesize);
891 if (!simple) {
892 AV_COPY64(top_border+16, src_cb + 7*uvlinesize);
893 AV_COPY64(top_border+24, src_cr + 7*uvlinesize);
894 }
895}
896
897static av_always_inline
898void xchg_mb_border(uint8_t *top_border, uint8_t *src_y, uint8_t *src_cb, uint8_t *src_cr,
899 int linesize, int uvlinesize, int mb_x, int mb_y, int mb_width,
900 int simple, int xchg)
901{
902 uint8_t *top_border_m1 = top_border-32; // for TL prediction
903 src_y -= linesize;
904 src_cb -= uvlinesize;
905 src_cr -= uvlinesize;
906
096971e8
MR
907#define XCHG(a,b,xchg) do { \
908 if (xchg) AV_SWAP64(b,a); \
909 else AV_COPY64(b,a); \
910 } while (0)
9ac831c2
DC
911
912 XCHG(top_border_m1+8, src_y-8, xchg);
913 XCHG(top_border, src_y, xchg);
914 XCHG(top_border+8, src_y+8, 1);
070ce7ef 915 if (mb_x < mb_width-1)
9ac831c2 916 XCHG(top_border+32, src_y+16, 1);
070ce7ef 917
9ac831c2
DC
918 // only copy chroma for normal loop filter
919 // or to initialize the top row to 127
920 if (!simple || !mb_y) {
921 XCHG(top_border_m1+16, src_cb-8, xchg);
922 XCHG(top_border_m1+24, src_cr-8, xchg);
923 XCHG(top_border+16, src_cb, 1);
924 XCHG(top_border+24, src_cr, 1);
925 }
926}
927
3b636f21
DC
928static int check_intra_pred_mode(int mode, int mb_x, int mb_y)
929{
930 if (mode == DC_PRED8x8) {
931 if (!(mb_x|mb_y))
932 mode = DC_128_PRED8x8;
933 else if (!mb_y)
934 mode = LEFT_DC_PRED8x8;
935 else if (!mb_x)
936 mode = TOP_DC_PRED8x8;
937 }
938 return mode;
939}
940
941static void intra_predict(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb,
d1c58fce 942 uint8_t *intra4x4, int mb_x, int mb_y)
3b636f21
DC
943{
944 int x, y, mode, nnz, tr;
945
9ac831c2
DC
946 // for the first row, we need to run xchg_mb_border to init the top edge to 127
947 // otherwise, skip it if we aren't going to deblock
948 if (s->deblock_filter || !mb_y)
949 xchg_mb_border(s->top_border[mb_x+1], dst[0], dst[1], dst[2],
950 s->linesize, s->uvlinesize, mb_x, mb_y, s->mb_width,
951 s->filter.simple, 1);
952
3b636f21
DC
953 if (mb->mode < MODE_I4x4) {
954 mode = check_intra_pred_mode(mb->mode, mb_x, mb_y);
955 s->hpc.pred16x16[mode](dst[0], s->linesize);
956 } else {
957 uint8_t *ptr = dst[0];
d1c58fce 958 int stride = s->keyframe ? s->b4_stride : 4;
3b636f21
DC
959
960 // all blocks on the right edge of the macroblock use bottom edge
961 // the top macroblock for their topright edge
962 uint8_t *tr_right = ptr - s->linesize + 16;
963
964 // if we're on the right edge of the frame, said edge is extended
965 // from the top macroblock
966 if (mb_x == s->mb_width-1) {
967 tr = tr_right[-1]*0x01010101;
968 tr_right = (uint8_t *)&tr;
969 }
970
971 for (y = 0; y < 4; y++) {
972 uint8_t *topright = ptr + 4 - s->linesize;
973 for (x = 0; x < 4; x++) {
974 if (x == 3)
975 topright = tr_right;
976
d1c58fce 977 s->hpc.pred4x4[intra4x4[x]](ptr+4*x, topright, s->linesize);
3b636f21
DC
978
979 nnz = s->non_zero_count_cache[y][x];
980 if (nnz) {
981 if (nnz == 1)
982 s->vp8dsp.vp8_idct_dc_add(ptr+4*x, s->block[y][x], s->linesize);
983 else
984 s->vp8dsp.vp8_idct_add(ptr+4*x, s->block[y][x], s->linesize);
985 }
986 topright += 4;
987 }
988
989 ptr += 4*s->linesize;
d1c58fce 990 intra4x4 += stride;
3b636f21
DC
991 }
992 }
993
994 mode = check_intra_pred_mode(s->chroma_pred_mode, mb_x, mb_y);
995 s->hpc.pred8x8[mode](dst[1], s->uvlinesize);
996 s->hpc.pred8x8[mode](dst[2], s->uvlinesize);
9ac831c2
DC
997
998 if (s->deblock_filter || !mb_y)
999 xchg_mb_border(s->top_border[mb_x+1], dst[0], dst[1], dst[2],
1000 s->linesize, s->uvlinesize, mb_x, mb_y, s->mb_width,
1001 s->filter.simple, 0);
3b636f21
DC
1002}
1003
1004/**
1005 * Generic MC function.
1006 *
1007 * @param s VP8 decoding context
1008 * @param luma 1 for luma (Y) planes, 0 for chroma (Cb/Cr) planes
1009 * @param dst target buffer for block data at block position
1010 * @param src reference picture buffer at origin (0, 0)
1011 * @param mv motion vector (relative to block position) to get pixel data from
1012 * @param x_off horizontal position of block from origin (0, 0)
1013 * @param y_off vertical position of block from origin (0, 0)
1014 * @param block_w width of block (16, 8 or 4)
1015 * @param block_h height of block (always same as block_w)
1016 * @param width width of src/dst plane data
1017 * @param height height of src/dst plane data
1018 * @param linesize size of a single line of plane data, including padding
e394953e 1019 * @param mc_func motion compensation function pointers (bilinear or sixtap MC)
3b636f21
DC
1020 */
1021static inline void vp8_mc(VP8Context *s, int luma,
1022 uint8_t *dst, uint8_t *src, const VP56mv *mv,
1023 int x_off, int y_off, int block_w, int block_h,
1024 int width, int height, int linesize,
d6f8476b 1025 vp8_mc_func mc_func[3][3])
3b636f21 1026{
c0498b30
JGG
1027 if (AV_RN32A(mv)) {
1028 static const uint8_t idx[8] = { 0, 1, 2, 1, 2, 1, 2, 1 };
1029 int mx = (mv->x << luma)&7, mx_idx = idx[mx];
1030 int my = (mv->y << luma)&7, my_idx = idx[my];
1031
1032 x_off += mv->x >> (3 - luma);
1033 y_off += mv->y >> (3 - luma);
1034
1035 // edge emulation
1036 src += y_off * linesize + x_off;
1037 if (x_off < 2 || x_off >= width - block_w - 3 ||
1038 y_off < 2 || y_off >= height - block_h - 3) {
1039 ff_emulated_edge_mc(s->edge_emu_buffer, src - 2 * linesize - 2, linesize,
1040 block_w + 5, block_h + 5,
1041 x_off - 2, y_off - 2, width, height);
1042 src = s->edge_emu_buffer + 2 + linesize * 2;
1043 }
1044 mc_func[my_idx][mx_idx](dst, linesize, src, linesize, block_h, mx, my);
1045 } else
1046 mc_func[0][0](dst, linesize, src + y_off * linesize + x_off, linesize, block_h, 0, 0);
3b636f21
DC
1047}
1048
7c4dcf81
RB
1049static inline void vp8_mc_part(VP8Context *s, uint8_t *dst[3],
1050 AVFrame *ref_frame, int x_off, int y_off,
1051 int bx_off, int by_off,
1052 int block_w, int block_h,
1053 int width, int height, VP56mv *mv)
1054{
1055 VP56mv uvmv = *mv;
1056
1057 /* Y */
1058 vp8_mc(s, 1, dst[0] + by_off * s->linesize + bx_off,
1059 ref_frame->data[0], mv, x_off + bx_off, y_off + by_off,
1060 block_w, block_h, width, height, s->linesize,
1061 s->put_pixels_tab[block_w == 8]);
1062
1063 /* U/V */
1064 if (s->profile == 3) {
1065 uvmv.x &= ~7;
1066 uvmv.y &= ~7;
1067 }
1068 x_off >>= 1; y_off >>= 1;
1069 bx_off >>= 1; by_off >>= 1;
1070 width >>= 1; height >>= 1;
1071 block_w >>= 1; block_h >>= 1;
1072 vp8_mc(s, 0, dst[1] + by_off * s->uvlinesize + bx_off,
1073 ref_frame->data[1], &uvmv, x_off + bx_off, y_off + by_off,
1074 block_w, block_h, width, height, s->uvlinesize,
1075 s->put_pixels_tab[1 + (block_w == 4)]);
1076 vp8_mc(s, 0, dst[2] + by_off * s->uvlinesize + bx_off,
1077 ref_frame->data[2], &uvmv, x_off + bx_off, y_off + by_off,
1078 block_w, block_h, width, height, s->uvlinesize,
1079 s->put_pixels_tab[1 + (block_w == 4)]);
1080}
1081
d864dee8
JGG
1082/* Fetch pixels for estimated mv 4 macroblocks ahead.
1083 * Optimized for 64-byte cache lines. Inspired by ffh264 prefetch_motion. */
1084static inline void prefetch_motion(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y, int x_off, int y_off, int ref)
1085{
1086 if (mb->ref_frame != VP56_FRAME_CURRENT) {
1087 int mx = mb->mv.x + x_off + 8;
1088 int my = mb->mv.y + y_off;
1089 uint8_t **src= s->framep[mb->ref_frame]->data;
1090 int off= mx + (my + (mb_x&3)*4)*s->linesize + 64;
1091 s->dsp.prefetch(src[0]+off, s->linesize, 4);
1092 off= (mx>>1) + ((my>>1) + (mb_x&7))*s->uvlinesize + 64;
1093 s->dsp.prefetch(src[1]+off, src[2]-src[1], 2);
1094 }
1095}
1096
3b636f21
DC
1097/**
1098 * Apply motion vectors to prediction buffer, chapter 18.
1099 */
1100static void inter_predict(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb,
1101 int mb_x, int mb_y)
1102{
1103 int x_off = mb_x << 4, y_off = mb_y << 4;
1104 int width = 16*s->mb_width, height = 16*s->mb_height;
d292c345
JGG
1105 AVFrame *ref = s->framep[mb->ref_frame];
1106 VP56mv *bmv = mb->bmv;
3b636f21 1107
d864dee8
JGG
1108 prefetch_motion(s, mb, mb_x, mb_y, x_off, y_off, VP56_FRAME_PREVIOUS);
1109
3b636f21 1110 if (mb->mode < VP8_MVMODE_SPLIT) {
d292c345 1111 vp8_mc_part(s, dst, ref, x_off, y_off,
7c4dcf81
RB
1112 0, 0, 16, 16, width, height, &mb->mv);
1113 } else switch (mb->partitioning) {
1114 case VP8_SPLITMVMODE_4x4: {
3b636f21 1115 int x, y;
7c4dcf81 1116 VP56mv uvmv;
3b636f21
DC
1117
1118 /* Y */
1119 for (y = 0; y < 4; y++) {
1120 for (x = 0; x < 4; x++) {
1121 vp8_mc(s, 1, dst[0] + 4*y*s->linesize + x*4,
d292c345 1122 ref->data[0], &bmv[4*y + x],
3b636f21
DC
1123 4*x + x_off, 4*y + y_off, 4, 4,
1124 width, height, s->linesize,
0ef1dbed 1125 s->put_pixels_tab[2]);
3b636f21
DC
1126 }
1127 }
1128
1129 /* U/V */
1130 x_off >>= 1; y_off >>= 1; width >>= 1; height >>= 1;
1131 for (y = 0; y < 2; y++) {
1132 for (x = 0; x < 2; x++) {
1133 uvmv.x = mb->bmv[ 2*y * 4 + 2*x ].x +
1134 mb->bmv[ 2*y * 4 + 2*x+1].x +
1135 mb->bmv[(2*y+1) * 4 + 2*x ].x +
1136 mb->bmv[(2*y+1) * 4 + 2*x+1].x;
1137 uvmv.y = mb->bmv[ 2*y * 4 + 2*x ].y +
1138 mb->bmv[ 2*y * 4 + 2*x+1].y +
1139 mb->bmv[(2*y+1) * 4 + 2*x ].y +
1140 mb->bmv[(2*y+1) * 4 + 2*x+1].y;
8f910a56
SG
1141 uvmv.x = (uvmv.x + 2 + (uvmv.x >> (INT_BIT-1))) >> 2;
1142 uvmv.y = (uvmv.y + 2 + (uvmv.y >> (INT_BIT-1))) >> 2;
3b636f21
DC
1143 if (s->profile == 3) {
1144 uvmv.x &= ~7;
1145 uvmv.y &= ~7;
1146 }
1147 vp8_mc(s, 0, dst[1] + 4*y*s->uvlinesize + x*4,
d292c345 1148 ref->data[1], &uvmv,
3b636f21
DC
1149 4*x + x_off, 4*y + y_off, 4, 4,
1150 width, height, s->uvlinesize,
0ef1dbed 1151 s->put_pixels_tab[2]);
3b636f21 1152 vp8_mc(s, 0, dst[2] + 4*y*s->uvlinesize + x*4,
d292c345 1153 ref->data[2], &uvmv,
3b636f21
DC
1154 4*x + x_off, 4*y + y_off, 4, 4,
1155 width, height, s->uvlinesize,
0ef1dbed 1156 s->put_pixels_tab[2]);
3b636f21
DC
1157 }
1158 }
7c4dcf81
RB
1159 break;
1160 }
1161 case VP8_SPLITMVMODE_16x8:
d292c345
JGG
1162 vp8_mc_part(s, dst, ref, x_off, y_off,
1163 0, 0, 16, 8, width, height, &bmv[0]);
1164 vp8_mc_part(s, dst, ref, x_off, y_off,
1165 0, 8, 16, 8, width, height, &bmv[1]);
7c4dcf81
RB
1166 break;
1167 case VP8_SPLITMVMODE_8x16:
d292c345
JGG
1168 vp8_mc_part(s, dst, ref, x_off, y_off,
1169 0, 0, 8, 16, width, height, &bmv[0]);
1170 vp8_mc_part(s, dst, ref, x_off, y_off,
1171 8, 0, 8, 16, width, height, &bmv[1]);
7c4dcf81
RB
1172 break;
1173 case VP8_SPLITMVMODE_8x8:
d292c345
JGG
1174 vp8_mc_part(s, dst, ref, x_off, y_off,
1175 0, 0, 8, 8, width, height, &bmv[0]);
1176 vp8_mc_part(s, dst, ref, x_off, y_off,
1177 8, 0, 8, 8, width, height, &bmv[1]);
1178 vp8_mc_part(s, dst, ref, x_off, y_off,
1179 0, 8, 8, 8, width, height, &bmv[2]);
1180 vp8_mc_part(s, dst, ref, x_off, y_off,
1181 8, 8, 8, 8, width, height, &bmv[3]);
7c4dcf81 1182 break;
3b636f21 1183 }
d864dee8
JGG
1184
1185 prefetch_motion(s, mb, mb_x, mb_y, x_off, y_off, VP56_FRAME_GOLDEN);
3b636f21
DC
1186}
1187
1188static void idct_mb(VP8Context *s, uint8_t *y_dst, uint8_t *u_dst, uint8_t *v_dst,
1189 VP8Macroblock *mb)
1190{
1191 int x, y, nnz;
1192
1193 if (mb->mode != MODE_I4x4)
1194 for (y = 0; y < 4; y++) {
1195 for (x = 0; x < 4; x++) {
1196 nnz = s->non_zero_count_cache[y][x];
1197 if (nnz) {
1198 if (nnz == 1)
1199 s->vp8dsp.vp8_idct_dc_add(y_dst+4*x, s->block[y][x], s->linesize);
1200 else
1201 s->vp8dsp.vp8_idct_add(y_dst+4*x, s->block[y][x], s->linesize);
1202 }
1203 }
1204 y_dst += 4*s->linesize;
1205 }
1206
1207 for (y = 0; y < 2; y++) {
1208 for (x = 0; x < 2; x++) {
1209 nnz = s->non_zero_count_cache[4][(y<<1)+x];
1210 if (nnz) {
1211 if (nnz == 1)
1212 s->vp8dsp.vp8_idct_dc_add(u_dst+4*x, s->block[4][(y<<1)+x], s->uvlinesize);
1213 else
1214 s->vp8dsp.vp8_idct_add(u_dst+4*x, s->block[4][(y<<1)+x], s->uvlinesize);
1215 }
1216
1217 nnz = s->non_zero_count_cache[5][(y<<1)+x];
1218 if (nnz) {
1219 if (nnz == 1)
1220 s->vp8dsp.vp8_idct_dc_add(v_dst+4*x, s->block[5][(y<<1)+x], s->uvlinesize);
1221 else
1222 s->vp8dsp.vp8_idct_add(v_dst+4*x, s->block[5][(y<<1)+x], s->uvlinesize);
1223 }
1224 }
1225 u_dst += 4*s->uvlinesize;
1226 v_dst += 4*s->uvlinesize;
1227 }
1228}
1229
968570d6 1230static void filter_level_for_mb(VP8Context *s, VP8Macroblock *mb, VP8FilterStrength *f )
3b636f21
DC
1231{
1232 int interior_limit, filter_level;
1233
1234 if (s->segmentation.enabled) {
b9a7186b 1235 filter_level = s->segmentation.filter_level[s->segment];
3b636f21
DC
1236 if (!s->segmentation.absolute_vals)
1237 filter_level += s->filter.level;
1238 } else
1239 filter_level = s->filter.level;
1240
1241 if (s->lf_delta.enabled) {
1242 filter_level += s->lf_delta.ref[mb->ref_frame];
1243
1244 if (mb->ref_frame == VP56_FRAME_CURRENT) {
1245 if (mb->mode == MODE_I4x4)
1246 filter_level += s->lf_delta.mode[0];
1247 } else {
1248 if (mb->mode == VP8_MVMODE_ZERO)
1249 filter_level += s->lf_delta.mode[1];
1250 else if (mb->mode == VP8_MVMODE_SPLIT)
1251 filter_level += s->lf_delta.mode[3];
1252 else
1253 filter_level += s->lf_delta.mode[2];
1254 }
1255 }
1256 filter_level = av_clip(filter_level, 0, 63);
1257
1258 interior_limit = filter_level;
1259 if (s->filter.sharpness) {
1260 interior_limit >>= s->filter.sharpness > 4 ? 2 : 1;
1261 interior_limit = FFMIN(interior_limit, 9 - s->filter.sharpness);
1262 }
1263 interior_limit = FFMAX(interior_limit, 1);
1264
968570d6
JGG
1265 f->filter_level = filter_level;
1266 f->inner_limit = interior_limit;
c55e0d34 1267 f->inner_filter = !mb->skip || mb->mode == MODE_I4x4 || mb->mode == VP8_MVMODE_SPLIT;
3b636f21
DC
1268}
1269
c55e0d34 1270static void filter_mb(VP8Context *s, uint8_t *dst[3], VP8FilterStrength *f, int mb_x, int mb_y)
3b636f21 1271{
968570d6
JGG
1272 int mbedge_lim, bedge_lim, hev_thresh;
1273 int filter_level = f->filter_level;
1274 int inner_limit = f->inner_limit;
c55e0d34 1275 int inner_filter = f->inner_filter;
3b636f21 1276
3b636f21
DC
1277 if (!filter_level)
1278 return;
1279
5245c04d
DC
1280 mbedge_lim = 2*(filter_level+2) + inner_limit;
1281 bedge_lim = 2* filter_level + inner_limit;
968570d6
JGG
1282 hev_thresh = filter_level >= 15;
1283
1284 if (s->keyframe) {
1285 if (filter_level >= 40)
1286 hev_thresh = 2;
1287 } else {
1288 if (filter_level >= 40)
1289 hev_thresh = 3;
1290 else if (filter_level >= 20)
1291 hev_thresh = 2;
1292 }
5245c04d 1293
3b636f21 1294 if (mb_x) {
3facfc99
RB
1295 s->vp8dsp.vp8_h_loop_filter16y(dst[0], s->linesize,
1296 mbedge_lim, inner_limit, hev_thresh);
1297 s->vp8dsp.vp8_h_loop_filter8uv(dst[1], dst[2], s->uvlinesize,
1298 mbedge_lim, inner_limit, hev_thresh);
3b636f21
DC
1299 }
1300
c55e0d34 1301 if (inner_filter) {
3facfc99
RB
1302 s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+ 4, s->linesize, bedge_lim,
1303 inner_limit, hev_thresh);
1304 s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+ 8, s->linesize, bedge_lim,
1305 inner_limit, hev_thresh);
1306 s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+12, s->linesize, bedge_lim,
1307 inner_limit, hev_thresh);
1308 s->vp8dsp.vp8_h_loop_filter8uv_inner(dst[1] + 4, dst[2] + 4,
1309 s->uvlinesize, bedge_lim,
1310 inner_limit, hev_thresh);
3b636f21
DC
1311 }
1312
1313 if (mb_y) {
3facfc99
RB
1314 s->vp8dsp.vp8_v_loop_filter16y(dst[0], s->linesize,
1315 mbedge_lim, inner_limit, hev_thresh);
1316 s->vp8dsp.vp8_v_loop_filter8uv(dst[1], dst[2], s->uvlinesize,
1317 mbedge_lim, inner_limit, hev_thresh);
3b636f21
DC
1318 }
1319
c55e0d34 1320 if (inner_filter) {
3facfc99
RB
1321 s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0]+ 4*s->linesize,
1322 s->linesize, bedge_lim,
1323 inner_limit, hev_thresh);
1324 s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0]+ 8*s->linesize,
1325 s->linesize, bedge_lim,
1326 inner_limit, hev_thresh);
1327 s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0]+12*s->linesize,
1328 s->linesize, bedge_lim,
1329 inner_limit, hev_thresh);
1330 s->vp8dsp.vp8_v_loop_filter8uv_inner(dst[1] + 4 * s->uvlinesize,
1331 dst[2] + 4 * s->uvlinesize,
1332 s->uvlinesize, bedge_lim,
1333 inner_limit, hev_thresh);
3b636f21
DC
1334 }
1335}
1336
c55e0d34 1337static void filter_mb_simple(VP8Context *s, uint8_t *dst, VP8FilterStrength *f, int mb_x, int mb_y)
3b636f21 1338{
968570d6
JGG
1339 int mbedge_lim, bedge_lim;
1340 int filter_level = f->filter_level;
1341 int inner_limit = f->inner_limit;
c55e0d34 1342 int inner_filter = f->inner_filter;
3b636f21 1343
3b636f21
DC
1344 if (!filter_level)
1345 return;
1346
1347 mbedge_lim = 2*(filter_level+2) + inner_limit;
1348 bedge_lim = 2* filter_level + inner_limit;
1349
1350 if (mb_x)
1351 s->vp8dsp.vp8_h_loop_filter_simple(dst, s->linesize, mbedge_lim);
c55e0d34 1352 if (inner_filter) {
3b636f21
DC
1353 s->vp8dsp.vp8_h_loop_filter_simple(dst+ 4, s->linesize, bedge_lim);
1354 s->vp8dsp.vp8_h_loop_filter_simple(dst+ 8, s->linesize, bedge_lim);
1355 s->vp8dsp.vp8_h_loop_filter_simple(dst+12, s->linesize, bedge_lim);
1356 }
1357
1358 if (mb_y)
1359 s->vp8dsp.vp8_v_loop_filter_simple(dst, s->linesize, mbedge_lim);
c55e0d34 1360 if (inner_filter) {
3b636f21
DC
1361 s->vp8dsp.vp8_v_loop_filter_simple(dst+ 4*s->linesize, s->linesize, bedge_lim);
1362 s->vp8dsp.vp8_v_loop_filter_simple(dst+ 8*s->linesize, s->linesize, bedge_lim);
1363 s->vp8dsp.vp8_v_loop_filter_simple(dst+12*s->linesize, s->linesize, bedge_lim);
1364 }
1365}
1366
1367static void filter_mb_row(VP8Context *s, int mb_y)
1368{
968570d6 1369 VP8FilterStrength *f = s->filter_strength;
3b636f21
DC
1370 uint8_t *dst[3] = {
1371 s->framep[VP56_FRAME_CURRENT]->data[0] + 16*mb_y*s->linesize,
1372 s->framep[VP56_FRAME_CURRENT]->data[1] + 8*mb_y*s->uvlinesize,
1373 s->framep[VP56_FRAME_CURRENT]->data[2] + 8*mb_y*s->uvlinesize
1374 };
1375 int mb_x;
1376
1377 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
9ac831c2 1378 backup_mb_border(s->top_border[mb_x+1], dst[0], dst[1], dst[2], s->linesize, s->uvlinesize, 0);
c55e0d34 1379 filter_mb(s, dst, f++, mb_x, mb_y);
3b636f21
DC
1380 dst[0] += 16;
1381 dst[1] += 8;
1382 dst[2] += 8;
1383 }
1384}
1385
1386static void filter_mb_row_simple(VP8Context *s, int mb_y)
1387{
968570d6 1388 VP8FilterStrength *f = s->filter_strength;
968570d6 1389 uint8_t *dst = s->framep[VP56_FRAME_CURRENT]->data[0] + 16*mb_y*s->linesize;
3b636f21
DC
1390 int mb_x;
1391
1392 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
9ac831c2 1393 backup_mb_border(s->top_border[mb_x+1], dst, NULL, NULL, s->linesize, 0, 1);
c55e0d34 1394 filter_mb_simple(s, dst, f++, mb_x, mb_y);
3b636f21
DC
1395 dst += 16;
1396 }
1397}
1398
1399static int vp8_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
1400 AVPacket *avpkt)
1401{
1402 VP8Context *s = avctx->priv_data;
1403 int ret, mb_x, mb_y, i, y, referenced;
1404 enum AVDiscard skip_thresh;
1405 AVFrame *curframe;
1406
1407 if ((ret = decode_frame_header(s, avpkt->data, avpkt->size)) < 0)
1408 return ret;
1409
1410 referenced = s->update_last || s->update_golden == VP56_FRAME_CURRENT
1411 || s->update_altref == VP56_FRAME_CURRENT;
1412
1413 skip_thresh = !referenced ? AVDISCARD_NONREF :
1414 !s->keyframe ? AVDISCARD_NONKEY : AVDISCARD_ALL;
1415
1416 if (avctx->skip_frame >= skip_thresh) {
1417 s->invisible = 1;
1418 goto skip_decode;
1419 }
9ac831c2 1420 s->deblock_filter = s->filter.level && avctx->skip_loop_filter < skip_thresh;
3b636f21
DC
1421
1422 for (i = 0; i < 4; i++)
1423 if (&s->frames[i] != s->framep[VP56_FRAME_PREVIOUS] &&
1424 &s->frames[i] != s->framep[VP56_FRAME_GOLDEN] &&
1425 &s->frames[i] != s->framep[VP56_FRAME_GOLDEN2]) {
1426 curframe = s->framep[VP56_FRAME_CURRENT] = &s->frames[i];
1427 break;
1428 }
1429 if (curframe->data[0])
1430 avctx->release_buffer(avctx, curframe);
1431
1432 curframe->key_frame = s->keyframe;
1433 curframe->pict_type = s->keyframe ? FF_I_TYPE : FF_P_TYPE;
1434 curframe->reference = referenced ? 3 : 0;
1435 if ((ret = avctx->get_buffer(avctx, curframe))) {
1436 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed!\n");
1437 return ret;
1438 }
1439
1440 // Given that arithmetic probabilities are updated every frame, it's quite likely
1441 // that the values we have on a random interframe are complete junk if we didn't
1442 // start decode on a keyframe. So just don't display anything rather than junk.
1443 if (!s->keyframe && (!s->framep[VP56_FRAME_PREVIOUS] ||
1444 !s->framep[VP56_FRAME_GOLDEN] ||
1445 !s->framep[VP56_FRAME_GOLDEN2])) {
1446 av_log(avctx, AV_LOG_WARNING, "Discarding interframe without a prior keyframe!\n");
1447 return AVERROR_INVALIDDATA;
1448 }
1449
1450 s->linesize = curframe->linesize[0];
1451 s->uvlinesize = curframe->linesize[1];
1452
1453 if (!s->edge_emu_buffer)
1454 s->edge_emu_buffer = av_malloc(21*s->linesize);
1455
1456 memset(s->top_nnz, 0, s->mb_width*sizeof(*s->top_nnz));
1457
c55e0d34
JGG
1458 /* Zero macroblock structures for top/left prediction from outside the frame. */
1459 memset(s->macroblocks, 0, (s->mb_width + s->mb_height*2)*sizeof(*s->macroblocks));
1460
3b636f21 1461 // top edge of 127 for intra prediction
9ac831c2 1462 memset(s->top_border, 127, (s->mb_width+1)*sizeof(*s->top_border));
3b636f21
DC
1463
1464 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
1465 VP56RangeCoder *c = &s->coeff_partition[mb_y & (s->num_coeff_partitions-1)];
c55e0d34 1466 VP8Macroblock *mb = s->macroblocks + (s->mb_height - mb_y - 1)*2;
3b636f21 1467 uint8_t *intra4x4 = s->intra4x4_pred_mode + 4*mb_y*s->b4_stride;
c55e0d34 1468 uint8_t *segment_map = s->segmentation_map + mb_y*s->mb_stride;
3b636f21
DC
1469 uint8_t *dst[3] = {
1470 curframe->data[0] + 16*mb_y*s->linesize,
1471 curframe->data[1] + 8*mb_y*s->uvlinesize,
1472 curframe->data[2] + 8*mb_y*s->uvlinesize
1473 };
1474
1475 memset(s->left_nnz, 0, sizeof(s->left_nnz));
1476
1477 // left edge of 129 for intra prediction
1478 if (!(avctx->flags & CODEC_FLAG_EMU_EDGE))
1479 for (i = 0; i < 3; i++)
1480 for (y = 0; y < 16>>!!i; y++)
1481 dst[i][y*curframe->linesize[i]-1] = 129;
9ac831c2
DC
1482 if (mb_y)
1483 memset(s->top_border, 129, sizeof(*s->top_border));
3b636f21
DC
1484
1485 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
d1c58fce 1486 uint8_t *intra4x4_mb = s->keyframe ? intra4x4 + 4*mb_x : s->intra4x4_pred_mode_mb;
c55e0d34 1487 uint8_t *segment_mb = segment_map+mb_x;
d1c58fce 1488
d864dee8
JGG
1489 /* Prefetch the current frame, 4 MBs ahead */
1490 s->dsp.prefetch(dst[0] + (mb_x&3)*4*s->linesize + 64, s->linesize, 4);
1491 s->dsp.prefetch(dst[1] + (mb_x&7)*s->uvlinesize + 64, dst[2] - dst[1], 2);
1492
c55e0d34 1493 decode_mb_mode(s, mb, mb_x, mb_y, intra4x4_mb, segment_mb);
3b636f21
DC
1494
1495 if (!mb->skip)
1496 decode_mb_coeffs(s, c, mb, s->top_nnz[mb_x], s->left_nnz);
1497 else {
1498 AV_ZERO128(s->non_zero_count_cache); // luma
1499 AV_ZERO64(s->non_zero_count_cache[4]); // chroma
1500 }
1501
b946111f 1502 if (mb->mode <= MODE_I4x4)
d1c58fce 1503 intra_predict(s, dst, mb, intra4x4_mb, mb_x, mb_y);
b946111f 1504 else
3b636f21 1505 inter_predict(s, dst, mb, mb_x, mb_y);
3b636f21
DC
1506
1507 if (!mb->skip) {
1508 idct_mb(s, dst[0], dst[1], dst[2], mb);
1509 } else {
1510 AV_ZERO64(s->left_nnz);
1511 AV_WN64(s->top_nnz[mb_x], 0); // array of 9, so unaligned
1512
1513 // Reset DC block predictors if they would exist if the mb had coefficients
1514 if (mb->mode != MODE_I4x4 && mb->mode != VP8_MVMODE_SPLIT) {
1515 s->left_nnz[8] = 0;
1516 s->top_nnz[mb_x][8] = 0;
1517 }
1518 }
1519
968570d6
JGG
1520 if (s->deblock_filter)
1521 filter_level_for_mb(s, mb, &s->filter_strength[mb_x]);
1522
3b636f21
DC
1523 dst[0] += 16;
1524 dst[1] += 8;
1525 dst[2] += 8;
1526 mb++;
1527 }
9ac831c2 1528 if (s->deblock_filter) {
3b636f21 1529 if (s->filter.simple)
9ac831c2 1530 filter_mb_row_simple(s, mb_y);
3b636f21 1531 else
9ac831c2 1532 filter_mb_row(s, mb_y);
3b636f21
DC
1533 }
1534 }
3b636f21
DC
1535
1536skip_decode:
1537 // if future frames don't use the updated probabilities,
1538 // reset them to the values we saved
1539 if (!s->update_probabilities)
1540 s->prob[0] = s->prob[1];
1541
1542 // check if golden and altref are swapped
1543 if (s->update_altref == VP56_FRAME_GOLDEN &&
1544 s->update_golden == VP56_FRAME_GOLDEN2)
1545 FFSWAP(AVFrame *, s->framep[VP56_FRAME_GOLDEN], s->framep[VP56_FRAME_GOLDEN2]);
1546 else {
1547 if (s->update_altref != VP56_FRAME_NONE)
1548 s->framep[VP56_FRAME_GOLDEN2] = s->framep[s->update_altref];
1549
1550 if (s->update_golden != VP56_FRAME_NONE)
1551 s->framep[VP56_FRAME_GOLDEN] = s->framep[s->update_golden];
1552 }
1553
1554 if (s->update_last) // move cur->prev
1555 s->framep[VP56_FRAME_PREVIOUS] = s->framep[VP56_FRAME_CURRENT];
1556
1557 // release no longer referenced frames
1558 for (i = 0; i < 4; i++)
1559 if (s->frames[i].data[0] &&
1560 &s->frames[i] != s->framep[VP56_FRAME_CURRENT] &&
1561 &s->frames[i] != s->framep[VP56_FRAME_PREVIOUS] &&
1562 &s->frames[i] != s->framep[VP56_FRAME_GOLDEN] &&
1563 &s->frames[i] != s->framep[VP56_FRAME_GOLDEN2])
1564 avctx->release_buffer(avctx, &s->frames[i]);
1565
1566 if (!s->invisible) {
1567 *(AVFrame*)data = *s->framep[VP56_FRAME_CURRENT];
1568 *data_size = sizeof(AVFrame);
1569 }
1570
1571 return avpkt->size;
1572}
1573
1574static av_cold int vp8_decode_init(AVCodecContext *avctx)
1575{
1576 VP8Context *s = avctx->priv_data;
1577
1578 s->avctx = avctx;
1579 avctx->pix_fmt = PIX_FMT_YUV420P;
1580
1581 dsputil_init(&s->dsp, avctx);
1582 ff_h264_pred_init(&s->hpc, CODEC_ID_VP8);
1583 ff_vp8dsp_init(&s->vp8dsp);
1584
1585 // intra pred needs edge emulation among other things
1586 if (avctx->flags&CODEC_FLAG_EMU_EDGE) {
03ac56e7 1587 av_log(avctx, AV_LOG_ERROR, "Edge emulation not supported\n");
3b636f21
DC
1588 return AVERROR_PATCHWELCOME;
1589 }
1590
1591 return 0;
1592}
1593
1594static av_cold int vp8_decode_free(AVCodecContext *avctx)
1595{
1596 vp8_decode_flush(avctx);
1597 return 0;
1598}
1599
1600AVCodec vp8_decoder = {
1601 "vp8",
1602 AVMEDIA_TYPE_VIDEO,
1603 CODEC_ID_VP8,
1604 sizeof(VP8Context),
1605 vp8_decode_init,
1606 NULL,
1607 vp8_decode_free,
1608 vp8_decode_frame,
1609 CODEC_CAP_DR1,
1610 .flush = vp8_decode_flush,
1611 .long_name = NULL_IF_CONFIG_SMALL("On2 VP8"),
1612};