moves fraps huffman decoder to its own file, making it more generic
[libav.git] / libavcodec / vp6.c
CommitLineData
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1/**
2 * @file vp6.c
3 * VP6 compatible video decoder
4 *
5 * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
6 *
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7 * The VP6F decoder accepts an optional 1 byte extradata. It is composed of:
8 * - upper 4bits: difference between encoded width and visible width
9 * - lower 4bits: difference between encoded height and visible height
10 *
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11 * This file is part of FFmpeg.
12 *
13 * FFmpeg is free software; you can redistribute it and/or
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14 * modify it under the terms of the GNU Lesser General Public
15 * License as published by the Free Software Foundation; either
16 * version 2.1 of the License, or (at your option) any later version.
17 *
b78e7197 18 * FFmpeg is distributed in the hope that it will be useful,
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19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * Lesser General Public License for more details.
22 *
23 * You should have received a copy of the GNU Lesser General Public
b78e7197 24 * License along with FFmpeg; if not, write to the Free Software
7b94177e 25 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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26 */
27
28#include <stdlib.h>
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29
30#include "avcodec.h"
31#include "dsputil.h"
32#include "bitstream.h"
33#include "mpegvideo.h"
34
35#include "vp56.h"
36#include "vp56data.h"
37#include "vp6data.h"
38
39
40static int vp6_parse_header(vp56_context_t *s, uint8_t *buf, int buf_size,
41 int *golden_frame)
42{
43 vp56_range_coder_t *c = &s->c;
9110a0e3 44 int parse_filter_info = 0;
dd9b8635 45 int coeff_offset = 0;
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46 int vrt_shift = 0;
47 int sub_version;
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48 int rows, cols;
49 int res = 1;
dd9b8635 50 int separated_coeff = buf[0] & 1;
5ce117c3 51
704a2881 52 s->framep[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
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53 vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
54
704a2881 55 if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
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56 sub_version = buf[1] >> 3;
57 if (sub_version > 8)
58 return 0;
dd9b8635 59 s->filter_header = buf[1] & 0x06;
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60 if (buf[1] & 1) {
61 av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
62 return 0;
63 }
dd9b8635 64 if (separated_coeff || !s->filter_header) {
fead30d4 65 coeff_offset = AV_RB16(buf+2) - 2;
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66 buf += 2;
67 buf_size -= 2;
68 }
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69
70 rows = buf[2]; /* number of stored macroblock rows */
71 cols = buf[3]; /* number of stored macroblock cols */
72 /* buf[4] is number of displayed macroblock rows */
73 /* buf[5] is number of displayed macroblock cols */
74
75 if (16*cols != s->avctx->coded_width ||
76 16*rows != s->avctx->coded_height) {
77 avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);
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78 if (s->avctx->extradata_size == 1) {
79 s->avctx->width -= s->avctx->extradata[0] >> 4;
80 s->avctx->height -= s->avctx->extradata[0] & 0x0F;
81 }
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82 res = 2;
83 }
84
85 vp56_init_range_decoder(c, buf+6, buf_size-6);
86 vp56_rac_gets(c, 2);
87
dd9b8635 88 parse_filter_info = s->filter_header;
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89 if (sub_version < 8)
90 vrt_shift = 5;
91 s->sub_version = sub_version;
5ce117c3 92 } else {
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93 if (!s->sub_version)
94 return 0;
95
dd9b8635 96 if (separated_coeff || !s->filter_header) {
fead30d4 97 coeff_offset = AV_RB16(buf+1) - 2;
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98 buf += 2;
99 buf_size -= 2;
100 }
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101 vp56_init_range_decoder(c, buf+1, buf_size-1);
102
103 *golden_frame = vp56_rac_get(c);
dd9b8635 104 if (s->filter_header) {
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105 s->deblock_filtering = vp56_rac_get(c);
106 if (s->deblock_filtering)
107 vp56_rac_get(c);
108 if (s->sub_version > 7)
109 parse_filter_info = vp56_rac_get(c);
dd9b8635 110 }
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111 }
112
113 if (parse_filter_info) {
114 if (vp56_rac_get(c)) {
115 s->filter_mode = 2;
9110a0e3 116 s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift;
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117 s->max_vector_length = 2 << vp56_rac_gets(c, 3);
118 } else if (vp56_rac_get(c)) {
119 s->filter_mode = 1;
120 } else {
121 s->filter_mode = 0;
122 }
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123 if (s->sub_version > 7)
124 s->filter_selection = vp56_rac_gets(c, 4);
125 else
126 s->filter_selection = 16;
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127 }
128
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129 if (vp56_rac_get(c))
130 av_log(s->avctx, AV_LOG_WARNING,
131 "alternative entropy decoding not supported\n");
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132
133 if (coeff_offset) {
134 vp56_init_range_decoder(&s->cc, buf+coeff_offset,
135 buf_size-coeff_offset);
136 s->ccp = &s->cc;
137 } else {
138 s->ccp = &s->c;
139 }
140
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141 return res;
142}
143
144static void vp6_coeff_order_table_init(vp56_context_t *s)
145{
146 int i, pos, idx = 1;
147
247df384 148 s->modelp->coeff_index_to_pos[0] = 0;
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149 for (i=0; i<16; i++)
150 for (pos=1; pos<64; pos++)
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151 if (s->modelp->coeff_reorder[pos] == i)
152 s->modelp->coeff_index_to_pos[idx++] = pos;
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153}
154
155static void vp6_default_models_init(vp56_context_t *s)
156{
247df384 157 vp56_model_t *model = s->modelp;
5ce117c3 158
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159 model->vector_dct[0] = 0xA2;
160 model->vector_dct[1] = 0xA4;
161 model->vector_sig[0] = 0x80;
162 model->vector_sig[1] = 0x80;
163
164 memcpy(model->mb_types_stats, vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
165 memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv));
166 memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv));
167 memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv));
168 memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder));
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169
170 vp6_coeff_order_table_init(s);
171}
172
173static void vp6_parse_vector_models(vp56_context_t *s)
174{
175 vp56_range_coder_t *c = &s->c;
247df384 176 vp56_model_t *model = s->modelp;
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177 int comp, node;
178
179 for (comp=0; comp<2; comp++) {
180 if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][0]))
247df384 181 model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
5ce117c3 182 if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][1]))
247df384 183 model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
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184 }
185
186 for (comp=0; comp<2; comp++)
187 for (node=0; node<7; node++)
188 if (vp56_rac_get_prob(c, vp6_pdv_pct[comp][node]))
247df384 189 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
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190
191 for (comp=0; comp<2; comp++)
192 for (node=0; node<8; node++)
193 if (vp56_rac_get_prob(c, vp6_fdv_pct[comp][node]))
247df384 194 model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
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195}
196
197static void vp6_parse_coeff_models(vp56_context_t *s)
198{
199 vp56_range_coder_t *c = &s->c;
247df384 200 vp56_model_t *model = s->modelp;
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201 int def_prob[11];
202 int node, cg, ctx, pos;
203 int ct; /* code type */
204 int pt; /* plane type (0 for Y, 1 for U or V) */
205
206 memset(def_prob, 0x80, sizeof(def_prob));
207
208 for (pt=0; pt<2; pt++)
209 for (node=0; node<11; node++)
210 if (vp56_rac_get_prob(c, vp6_dccv_pct[pt][node])) {
211 def_prob[node] = vp56_rac_gets_nn(c, 7);
247df384 212 model->coeff_dccv[pt][node] = def_prob[node];
704a2881 213 } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
247df384 214 model->coeff_dccv[pt][node] = def_prob[node];
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215 }
216
217 if (vp56_rac_get(c)) {
218 for (pos=1; pos<64; pos++)
219 if (vp56_rac_get_prob(c, vp6_coeff_reorder_pct[pos]))
247df384 220 model->coeff_reorder[pos] = vp56_rac_gets(c, 4);
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221 vp6_coeff_order_table_init(s);
222 }
223
224 for (cg=0; cg<2; cg++)
225 for (node=0; node<14; node++)
226 if (vp56_rac_get_prob(c, vp6_runv_pct[cg][node]))
247df384 227 model->coeff_runv[cg][node] = vp56_rac_gets_nn(c, 7);
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228
229 for (ct=0; ct<3; ct++)
230 for (pt=0; pt<2; pt++)
231 for (cg=0; cg<6; cg++)
232 for (node=0; node<11; node++)
233 if (vp56_rac_get_prob(c, vp6_ract_pct[ct][pt][cg][node])) {
234 def_prob[node] = vp56_rac_gets_nn(c, 7);
247df384 235 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
704a2881 236 } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
247df384 237 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
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238 }
239
247df384 240 /* coeff_dcct is a linear combination of coeff_dccv */
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241 for (pt=0; pt<2; pt++)
242 for (ctx=0; ctx<3; ctx++)
243 for (node=0; node<5; node++)
247df384 244 model->coeff_dcct[pt][ctx][node] = av_clip(((model->coeff_dccv[pt][node] * vp6_dccv_lc[ctx][node][0] + 128) >> 8) + vp6_dccv_lc[ctx][node][1], 1, 255);
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245}
246
d120e402 247static void vp6_parse_vector_adjustment(vp56_context_t *s, vp56_mv_t *vect)
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248{
249 vp56_range_coder_t *c = &s->c;
247df384 250 vp56_model_t *model = s->modelp;
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251 int comp;
252
d120e402 253 *vect = (vp56_mv_t) {0,0};
5ce117c3 254 if (s->vector_candidate_pos < 2)
d120e402 255 *vect = s->vector_candidate[0];
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256
257 for (comp=0; comp<2; comp++) {
258 int i, delta = 0;
259
247df384 260 if (vp56_rac_get_prob(c, model->vector_dct[comp])) {
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261 static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};
262 for (i=0; i<sizeof(prob_order); i++) {
263 int j = prob_order[i];
247df384 264 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][j])<<j;
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265 }
266 if (delta & 0xF0)
247df384 267 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3;
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268 else
269 delta |= 8;
270 } else {
271 delta = vp56_rac_get_tree(c, vp56_pva_tree,
247df384 272 model->vector_pdv[comp]);
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273 }
274
247df384 275 if (delta && vp56_rac_get_prob(c, model->vector_sig[comp]))
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276 delta = -delta;
277
278 if (!comp)
d120e402 279 vect->x += delta;
5ce117c3 280 else
d120e402 281 vect->y += delta;
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282 }
283}
284
285static void vp6_parse_coeff(vp56_context_t *s)
286{
dd9b8635 287 vp56_range_coder_t *c = s->ccp;
247df384 288 vp56_model_t *model = s->modelp;
5ce117c3 289 uint8_t *permute = s->scantable.permutated;
247df384 290 uint8_t *model1, *model2, *model3;
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291 int coeff, sign, coeff_idx;
292 int b, i, cg, idx, ctx;
293 int pt = 0; /* plane type (0 for Y, 1 for U or V) */
294
295 for (b=0; b<6; b++) {
296 int ct = 1; /* code type */
297 int run = 1;
298
299 if (b > 3) pt = 1;
300
301 ctx = s->left_block[vp56_b6to4[b]].not_null_dc
302 + s->above_blocks[s->above_block_idx[b]].not_null_dc;
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303 model1 = model->coeff_dccv[pt];
304 model2 = model->coeff_dcct[pt][ctx];
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305
306 for (coeff_idx=0; coeff_idx<64; ) {
307 if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob(c, model2[0])) {
308 /* parse a coeff */
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309 if (vp56_rac_get_prob(c, model2[2])) {
310 if (vp56_rac_get_prob(c, model2[3])) {
247df384 311 idx = vp56_rac_get_tree(c, vp56_pc_tree, model1);
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312 coeff = vp56_coeff_bias[idx];
313 for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
314 coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
315 } else {
316 if (vp56_rac_get_prob(c, model2[4]))
247df384 317 coeff = 3 + vp56_rac_get_prob(c, model1[5]);
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318 else
319 coeff = 2;
320 }
321 ct = 2;
322 } else {
323 ct = 1;
324 coeff = 1;
325 }
326 sign = vp56_rac_get(c);
327 coeff = (coeff ^ -sign) + sign;
328 if (coeff_idx)
329 coeff *= s->dequant_ac;
247df384 330 idx = model->coeff_index_to_pos[coeff_idx];
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331 s->block_coeff[b][permute[idx]] = coeff;
332 run = 1;
333 } else {
334 /* parse a run */
335 ct = 0;
4b8419aa 336 if (coeff_idx > 0) {
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337 if (!vp56_rac_get_prob(c, model2[1]))
338 break;
339
247df384 340 model3 = model->coeff_runv[coeff_idx >= 6];
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341 run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
342 if (!run)
343 for (run=9, i=0; i<6; i++)
344 run += vp56_rac_get_prob(c, model3[i+8]) << i;
345 }
346 }
347
348 cg = vp6_coeff_groups[coeff_idx+=run];
247df384 349 model1 = model2 = model->coeff_ract[pt][ct][cg];
5ce117c3 350 }
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351
352 s->left_block[vp56_b6to4[b]].not_null_dc =
353 s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];
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354 }
355}
356
357static int vp6_adjust(int v, int t)
358{
359 int V = v, s = v >> 31;
360 V ^= s;
361 V -= s;
362 if (V-t-1 >= (unsigned)(t-1))
363 return v;
364 V = 2*t - V;
365 V += s;
366 V ^= s;
367 return V;
368}
369
370static int vp6_block_variance(uint8_t *src, int stride)
371{
372 int sum = 0, square_sum = 0;
373 int y, x;
374
375 for (y=0; y<8; y+=2) {
376 for (x=0; x<8; x+=2) {
377 sum += src[x];
378 square_sum += src[x]*src[x];
379 }
380 src += 2*stride;
381 }
c29ff23c 382 return (16*square_sum - sum*sum) >> 8;
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383}
384
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385static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, int stride,
386 int delta, const int16_t *weights)
387{
388 int x, y;
389
390 for (y=0; y<8; y++) {
391 for (x=0; x<8; x++) {
f66e4f5f 392 dst[x] = av_clip_uint8(( src[x-delta ] * weights[0]
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393 + src[x ] * weights[1]
394 + src[x+delta ] * weights[2]
395 + src[x+2*delta] * weights[3] + 64) >> 7);
396 }
397 src += stride;
398 dst += stride;
399 }
400}
401
402static void vp6_filter_diag2(vp56_context_t *s, uint8_t *dst, uint8_t *src,
403 int stride, int h_weight, int v_weight)
404{
405 uint8_t *tmp = s->edge_emu_buffer+16;
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406 s->dsp.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
407 s->dsp.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
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408}
409
410static void vp6_filter_diag4(uint8_t *dst, uint8_t *src, int stride,
411 const int16_t *h_weights,const int16_t *v_weights)
412{
413 int x, y;
414 int tmp[8*11];
415 int *t = tmp;
416
417 src -= stride;
418
419 for (y=0; y<11; y++) {
420 for (x=0; x<8; x++) {
f66e4f5f 421 t[x] = av_clip_uint8(( src[x-1] * h_weights[0]
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422 + src[x ] * h_weights[1]
423 + src[x+1] * h_weights[2]
424 + src[x+2] * h_weights[3] + 64) >> 7);
425 }
426 src += stride;
427 t += 8;
428 }
429
430 t = tmp + 8;
431 for (y=0; y<8; y++) {
432 for (x=0; x<8; x++) {
f66e4f5f 433 dst[x] = av_clip_uint8(( t[x-8 ] * v_weights[0]
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434 + t[x ] * v_weights[1]
435 + t[x+8 ] * v_weights[2]
436 + t[x+16] * v_weights[3] + 64) >> 7);
437 }
438 dst += stride;
439 t += 8;
440 }
441}
442
443static void vp6_filter(vp56_context_t *s, uint8_t *dst, uint8_t *src,
444 int offset1, int offset2, int stride,
445 vp56_mv_t mv, int mask, int select, int luma)
446{
447 int filter4 = 0;
448 int x8 = mv.x & mask;
449 int y8 = mv.y & mask;
450
451 if (luma) {
452 x8 *= 2;
453 y8 *= 2;
454 filter4 = s->filter_mode;
455 if (filter4 == 2) {
456 if (s->max_vector_length &&
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457 (FFABS(mv.x) > s->max_vector_length ||
458 FFABS(mv.y) > s->max_vector_length)) {
5ce117c3 459 filter4 = 0;
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460 } else if (s->sample_variance_threshold
461 && (vp6_block_variance(src+offset1, stride)
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462 < s->sample_variance_threshold)) {
463 filter4 = 0;
464 }
465 }
466 }
467
468 if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {
469 offset1 = offset2;
470 }
471
472 if (filter4) {
473 if (!y8) { /* left or right combine */
474 vp6_filter_hv4(dst, src+offset1, stride, 1,
475 vp6_block_copy_filter[select][x8]);
476 } else if (!x8) { /* above or below combine */
477 vp6_filter_hv4(dst, src+offset1, stride, stride,
478 vp6_block_copy_filter[select][y8]);
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479 } else {
480 vp6_filter_diag4(dst, src+offset1 + ((mv.x^mv.y)>>31), stride,
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481 vp6_block_copy_filter[select][x8],
482 vp6_block_copy_filter[select][y8]);
483 }
484 } else {
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485 if (!x8 || !y8) {
486 s->dsp.put_h264_chroma_pixels_tab[0](dst, src+offset1, stride, 8, x8, y8);
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487 } else {
488 vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);
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489 }
490 }
491}
492
493static int vp6_decode_init(AVCodecContext *avctx)
494{
495 vp56_context_t *s = avctx->priv_data;
496
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497 vp56_init(avctx, avctx->codec->id == CODEC_ID_VP6,
498 avctx->codec->id == CODEC_ID_VP6A);
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499 s->vp56_coord_div = vp6_coord_div;
500 s->parse_vector_adjustment = vp6_parse_vector_adjustment;
501 s->adjust = vp6_adjust;
502 s->filter = vp6_filter;
503 s->parse_coeff = vp6_parse_coeff;
504 s->default_models_init = vp6_default_models_init;
505 s->parse_vector_models = vp6_parse_vector_models;
506 s->parse_coeff_models = vp6_parse_coeff_models;
507 s->parse_header = vp6_parse_header;
508
509 return 0;
510}
511
512AVCodec vp6_decoder = {
513 "vp6",
514 CODEC_TYPE_VIDEO,
515 CODEC_ID_VP6,
516 sizeof(vp56_context_t),
517 vp6_decode_init,
518 NULL,
519 vp56_free,
520 vp56_decode_frame,
75f6cc26 521 CODEC_CAP_DR1,
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522};
523
524/* flash version, not flipped upside-down */
525AVCodec vp6f_decoder = {
526 "vp6f",
527 CODEC_TYPE_VIDEO,
528 CODEC_ID_VP6F,
529 sizeof(vp56_context_t),
530 vp6_decode_init,
531 NULL,
532 vp56_free,
533 vp56_decode_frame,
75f6cc26 534 CODEC_CAP_DR1,
5ce117c3 535};
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AJ
536
537/* flash version, not flipped upside-down, with alpha channel */
538AVCodec vp6a_decoder = {
539 "vp6a",
540 CODEC_TYPE_VIDEO,
541 CODEC_ID_VP6A,
542 sizeof(vp56_context_t),
543 vp6_decode_init,
544 NULL,
545 vp56_free,
546 vp56_decode_frame,
547 CODEC_CAP_DR1,
548};