00001
00028 #include <stdlib.h>
00029
00030 #include "avcodec.h"
00031 #include "dsputil.h"
00032 #include "bitstream.h"
00033 #include "huffman.h"
00034
00035 #include "vp56.h"
00036 #include "vp56data.h"
00037 #include "vp6data.h"
00038
00039
00040 static void vp6_parse_coeff(VP56Context *s);
00041 static void vp6_parse_coeff_huffman(VP56Context *s);
00042
00043 static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
00044 int *golden_frame)
00045 {
00046 VP56RangeCoder *c = &s->c;
00047 int parse_filter_info = 0;
00048 int coeff_offset = 0;
00049 int vrt_shift = 0;
00050 int sub_version;
00051 int rows, cols;
00052 int res = 1;
00053 int separated_coeff = buf[0] & 1;
00054
00055 s->framep[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
00056 vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
00057
00058 if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
00059 sub_version = buf[1] >> 3;
00060 if (sub_version > 8)
00061 return 0;
00062 s->filter_header = buf[1] & 0x06;
00063 if (buf[1] & 1) {
00064 av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
00065 return 0;
00066 }
00067 if (separated_coeff || !s->filter_header) {
00068 coeff_offset = AV_RB16(buf+2) - 2;
00069 buf += 2;
00070 buf_size -= 2;
00071 }
00072
00073 rows = buf[2];
00074 cols = buf[3];
00075
00076
00077
00078 if (!s->macroblocks ||
00079 16*cols != s->avctx->coded_width ||
00080 16*rows != s->avctx->coded_height) {
00081 avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);
00082 if (s->avctx->extradata_size == 1) {
00083 s->avctx->width -= s->avctx->extradata[0] >> 4;
00084 s->avctx->height -= s->avctx->extradata[0] & 0x0F;
00085 }
00086 res = 2;
00087 }
00088
00089 vp56_init_range_decoder(c, buf+6, buf_size-6);
00090 vp56_rac_gets(c, 2);
00091
00092 parse_filter_info = s->filter_header;
00093 if (sub_version < 8)
00094 vrt_shift = 5;
00095 s->sub_version = sub_version;
00096 } else {
00097 if (!s->sub_version)
00098 return 0;
00099
00100 if (separated_coeff || !s->filter_header) {
00101 coeff_offset = AV_RB16(buf+1) - 2;
00102 buf += 2;
00103 buf_size -= 2;
00104 }
00105 vp56_init_range_decoder(c, buf+1, buf_size-1);
00106
00107 *golden_frame = vp56_rac_get(c);
00108 if (s->filter_header) {
00109 s->deblock_filtering = vp56_rac_get(c);
00110 if (s->deblock_filtering)
00111 vp56_rac_get(c);
00112 if (s->sub_version > 7)
00113 parse_filter_info = vp56_rac_get(c);
00114 }
00115 }
00116
00117 if (parse_filter_info) {
00118 if (vp56_rac_get(c)) {
00119 s->filter_mode = 2;
00120 s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift;
00121 s->max_vector_length = 2 << vp56_rac_gets(c, 3);
00122 } else if (vp56_rac_get(c)) {
00123 s->filter_mode = 1;
00124 } else {
00125 s->filter_mode = 0;
00126 }
00127 if (s->sub_version > 7)
00128 s->filter_selection = vp56_rac_gets(c, 4);
00129 else
00130 s->filter_selection = 16;
00131 }
00132
00133 s->use_huffman = vp56_rac_get(c);
00134
00135 s->parse_coeff = vp6_parse_coeff;
00136 if (coeff_offset) {
00137 buf += coeff_offset;
00138 buf_size -= coeff_offset;
00139 if (buf_size < 0)
00140 return 0;
00141 if (s->use_huffman) {
00142 s->parse_coeff = vp6_parse_coeff_huffman;
00143 init_get_bits(&s->gb, buf, buf_size<<3);
00144 } else {
00145 vp56_init_range_decoder(&s->cc, buf, buf_size);
00146 s->ccp = &s->cc;
00147 }
00148 } else {
00149 s->ccp = &s->c;
00150 }
00151
00152 return res;
00153 }
00154
00155 static void vp6_coeff_order_table_init(VP56Context *s)
00156 {
00157 int i, pos, idx = 1;
00158
00159 s->modelp->coeff_index_to_pos[0] = 0;
00160 for (i=0; i<16; i++)
00161 for (pos=1; pos<64; pos++)
00162 if (s->modelp->coeff_reorder[pos] == i)
00163 s->modelp->coeff_index_to_pos[idx++] = pos;
00164 }
00165
00166 static void vp6_default_models_init(VP56Context *s)
00167 {
00168 VP56Model *model = s->modelp;
00169
00170 model->vector_dct[0] = 0xA2;
00171 model->vector_dct[1] = 0xA4;
00172 model->vector_sig[0] = 0x80;
00173 model->vector_sig[1] = 0x80;
00174
00175 memcpy(model->mb_types_stats, vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
00176 memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv));
00177 memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv));
00178 memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv));
00179 memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder));
00180
00181 vp6_coeff_order_table_init(s);
00182 }
00183
00184 static void vp6_parse_vector_models(VP56Context *s)
00185 {
00186 VP56RangeCoder *c = &s->c;
00187 VP56Model *model = s->modelp;
00188 int comp, node;
00189
00190 for (comp=0; comp<2; comp++) {
00191 if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][0]))
00192 model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
00193 if (vp56_rac_get_prob(c, vp6_sig_dct_pct[comp][1]))
00194 model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
00195 }
00196
00197 for (comp=0; comp<2; comp++)
00198 for (node=0; node<7; node++)
00199 if (vp56_rac_get_prob(c, vp6_pdv_pct[comp][node]))
00200 model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
00201
00202 for (comp=0; comp<2; comp++)
00203 for (node=0; node<8; node++)
00204 if (vp56_rac_get_prob(c, vp6_fdv_pct[comp][node]))
00205 model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
00206 }
00207
00208
00209 static int vp6_huff_cmp(const void *va, const void *vb)
00210 {
00211 const Node *a = va, *b = vb;
00212 return (a->count - b->count)*16 + (b->sym - a->sym);
00213 }
00214
00215 static void vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[],
00216 const uint8_t *map, unsigned size, VLC *vlc)
00217 {
00218 Node nodes[2*size], *tmp = &nodes[size];
00219 int a, b, i;
00220
00221
00222 tmp[0].count = 256;
00223 for (i=0; i<size-1; i++) {
00224 a = tmp[i].count * coeff_model[i] >> 8;
00225 b = tmp[i].count * (255 - coeff_model[i]) >> 8;
00226 nodes[map[2*i ]].count = a + !a;
00227 nodes[map[2*i+1]].count = b + !b;
00228 }
00229
00230
00231 ff_huff_build_tree(s->avctx, vlc, size, nodes, vp6_huff_cmp,
00232 FF_HUFFMAN_FLAG_HNODE_FIRST);
00233 }
00234
00235 static void vp6_parse_coeff_models(VP56Context *s)
00236 {
00237 VP56RangeCoder *c = &s->c;
00238 VP56Model *model = s->modelp;
00239 int def_prob[11];
00240 int node, cg, ctx, pos;
00241 int ct;
00242 int pt;
00243
00244 memset(def_prob, 0x80, sizeof(def_prob));
00245
00246 for (pt=0; pt<2; pt++)
00247 for (node=0; node<11; node++)
00248 if (vp56_rac_get_prob(c, vp6_dccv_pct[pt][node])) {
00249 def_prob[node] = vp56_rac_gets_nn(c, 7);
00250 model->coeff_dccv[pt][node] = def_prob[node];
00251 } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
00252 model->coeff_dccv[pt][node] = def_prob[node];
00253 }
00254
00255 if (vp56_rac_get(c)) {
00256 for (pos=1; pos<64; pos++)
00257 if (vp56_rac_get_prob(c, vp6_coeff_reorder_pct[pos]))
00258 model->coeff_reorder[pos] = vp56_rac_gets(c, 4);
00259 vp6_coeff_order_table_init(s);
00260 }
00261
00262 for (cg=0; cg<2; cg++)
00263 for (node=0; node<14; node++)
00264 if (vp56_rac_get_prob(c, vp6_runv_pct[cg][node]))
00265 model->coeff_runv[cg][node] = vp56_rac_gets_nn(c, 7);
00266
00267 for (ct=0; ct<3; ct++)
00268 for (pt=0; pt<2; pt++)
00269 for (cg=0; cg<6; cg++)
00270 for (node=0; node<11; node++)
00271 if (vp56_rac_get_prob(c, vp6_ract_pct[ct][pt][cg][node])) {
00272 def_prob[node] = vp56_rac_gets_nn(c, 7);
00273 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
00274 } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
00275 model->coeff_ract[pt][ct][cg][node] = def_prob[node];
00276 }
00277
00278 if (s->use_huffman) {
00279 for (pt=0; pt<2; pt++) {
00280 vp6_build_huff_tree(s, model->coeff_dccv[pt],
00281 vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]);
00282 vp6_build_huff_tree(s, model->coeff_runv[pt],
00283 vp6_huff_run_map, 9, &s->runv_vlc[pt]);
00284 for (ct=0; ct<3; ct++)
00285 for (cg = 0; cg < 6; cg++)
00286 vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg],
00287 vp6_huff_coeff_map, 12,
00288 &s->ract_vlc[pt][ct][cg]);
00289 }
00290 memset(s->nb_null, 0, sizeof(s->nb_null));
00291 } else {
00292
00293 for (pt=0; pt<2; pt++)
00294 for (ctx=0; ctx<3; ctx++)
00295 for (node=0; node<5; node++)
00296 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);
00297 }
00298 }
00299
00300 static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
00301 {
00302 VP56RangeCoder *c = &s->c;
00303 VP56Model *model = s->modelp;
00304 int comp;
00305
00306 *vect = (VP56mv) {0,0};
00307 if (s->vector_candidate_pos < 2)
00308 *vect = s->vector_candidate[0];
00309
00310 for (comp=0; comp<2; comp++) {
00311 int i, delta = 0;
00312
00313 if (vp56_rac_get_prob(c, model->vector_dct[comp])) {
00314 static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};
00315 for (i=0; i<sizeof(prob_order); i++) {
00316 int j = prob_order[i];
00317 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][j])<<j;
00318 }
00319 if (delta & 0xF0)
00320 delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3;
00321 else
00322 delta |= 8;
00323 } else {
00324 delta = vp56_rac_get_tree(c, vp56_pva_tree,
00325 model->vector_pdv[comp]);
00326 }
00327
00328 if (delta && vp56_rac_get_prob(c, model->vector_sig[comp]))
00329 delta = -delta;
00330
00331 if (!comp)
00332 vect->x += delta;
00333 else
00334 vect->y += delta;
00335 }
00336 }
00337
00342 static unsigned vp6_get_nb_null(VP56Context *s)
00343 {
00344 unsigned val = get_bits(&s->gb, 2);
00345 if (val == 2)
00346 val += get_bits(&s->gb, 2);
00347 else if (val == 3) {
00348 val = get_bits1(&s->gb) << 2;
00349 val = 6+val + get_bits(&s->gb, 2+val);
00350 }
00351 return val;
00352 }
00353
00354 static void vp6_parse_coeff_huffman(VP56Context *s)
00355 {
00356 VP56Model *model = s->modelp;
00357 uint8_t *permute = s->scantable.permutated;
00358 VLC *vlc_coeff;
00359 int coeff, sign, coeff_idx;
00360 int b, cg, idx;
00361 int pt = 0;
00362
00363 for (b=0; b<6; b++) {
00364 int ct = 0;
00365 if (b > 3) pt = 1;
00366 vlc_coeff = &s->dccv_vlc[pt];
00367
00368 for (coeff_idx=0; coeff_idx<64; ) {
00369 int run = 1;
00370 if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
00371 s->nb_null[coeff_idx][pt]--;
00372 if (coeff_idx)
00373 break;
00374 } else {
00375 coeff = get_vlc2(&s->gb, vlc_coeff->table, 9, 3);
00376 if (coeff == 0) {
00377 if (coeff_idx) {
00378 int pt = (coeff_idx >= 6);
00379 run += get_vlc2(&s->gb, s->runv_vlc[pt].table, 9, 3);
00380 if (run >= 9)
00381 run += get_bits(&s->gb, 6);
00382 } else
00383 s->nb_null[0][pt] = vp6_get_nb_null(s);
00384 ct = 0;
00385 } else if (coeff == 11) {
00386 if (coeff_idx == 1)
00387 s->nb_null[1][pt] = vp6_get_nb_null(s);
00388 break;
00389 } else {
00390 int coeff2 = vp56_coeff_bias[coeff];
00391 if (coeff > 4)
00392 coeff2 += get_bits(&s->gb, coeff <= 9 ? coeff - 4 : 11);
00393 ct = 1 + (coeff2 > 1);
00394 sign = get_bits1(&s->gb);
00395 coeff2 = (coeff2 ^ -sign) + sign;
00396 if (coeff_idx)
00397 coeff2 *= s->dequant_ac;
00398 idx = model->coeff_index_to_pos[coeff_idx];
00399 s->block_coeff[b][permute[idx]] = coeff2;
00400 }
00401 }
00402 coeff_idx+=run;
00403 cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
00404 vlc_coeff = &s->ract_vlc[pt][ct][cg];
00405 }
00406 }
00407 }
00408
00409 static void vp6_parse_coeff(VP56Context *s)
00410 {
00411 VP56RangeCoder *c = s->ccp;
00412 VP56Model *model = s->modelp;
00413 uint8_t *permute = s->scantable.permutated;
00414 uint8_t *model1, *model2, *model3;
00415 int coeff, sign, coeff_idx;
00416 int b, i, cg, idx, ctx;
00417 int pt = 0;
00418
00419 for (b=0; b<6; b++) {
00420 int ct = 1;
00421 int run = 1;
00422
00423 if (b > 3) pt = 1;
00424
00425 ctx = s->left_block[vp56_b6to4[b]].not_null_dc
00426 + s->above_blocks[s->above_block_idx[b]].not_null_dc;
00427 model1 = model->coeff_dccv[pt];
00428 model2 = model->coeff_dcct[pt][ctx];
00429
00430 for (coeff_idx=0; coeff_idx<64; ) {
00431 if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob(c, model2[0])) {
00432
00433 if (vp56_rac_get_prob(c, model2[2])) {
00434 if (vp56_rac_get_prob(c, model2[3])) {
00435 idx = vp56_rac_get_tree(c, vp56_pc_tree, model1);
00436 coeff = vp56_coeff_bias[idx+5];
00437 for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
00438 coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
00439 } else {
00440 if (vp56_rac_get_prob(c, model2[4]))
00441 coeff = 3 + vp56_rac_get_prob(c, model1[5]);
00442 else
00443 coeff = 2;
00444 }
00445 ct = 2;
00446 } else {
00447 ct = 1;
00448 coeff = 1;
00449 }
00450 sign = vp56_rac_get(c);
00451 coeff = (coeff ^ -sign) + sign;
00452 if (coeff_idx)
00453 coeff *= s->dequant_ac;
00454 idx = model->coeff_index_to_pos[coeff_idx];
00455 s->block_coeff[b][permute[idx]] = coeff;
00456 run = 1;
00457 } else {
00458
00459 ct = 0;
00460 if (coeff_idx > 0) {
00461 if (!vp56_rac_get_prob(c, model2[1]))
00462 break;
00463
00464 model3 = model->coeff_runv[coeff_idx >= 6];
00465 run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
00466 if (!run)
00467 for (run=9, i=0; i<6; i++)
00468 run += vp56_rac_get_prob(c, model3[i+8]) << i;
00469 }
00470 }
00471
00472 cg = vp6_coeff_groups[coeff_idx+=run];
00473 model1 = model2 = model->coeff_ract[pt][ct][cg];
00474 }
00475
00476 s->left_block[vp56_b6to4[b]].not_null_dc =
00477 s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];
00478 }
00479 }
00480
00481 static int vp6_adjust(int v, int t)
00482 {
00483 int V = v, s = v >> 31;
00484 V ^= s;
00485 V -= s;
00486 if (V-t-1 >= (unsigned)(t-1))
00487 return v;
00488 V = 2*t - V;
00489 V += s;
00490 V ^= s;
00491 return V;
00492 }
00493
00494 static int vp6_block_variance(uint8_t *src, int stride)
00495 {
00496 int sum = 0, square_sum = 0;
00497 int y, x;
00498
00499 for (y=0; y<8; y+=2) {
00500 for (x=0; x<8; x+=2) {
00501 sum += src[x];
00502 square_sum += src[x]*src[x];
00503 }
00504 src += 2*stride;
00505 }
00506 return (16*square_sum - sum*sum) >> 8;
00507 }
00508
00509 static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, int stride,
00510 int delta, const int16_t *weights)
00511 {
00512 int x, y;
00513
00514 for (y=0; y<8; y++) {
00515 for (x=0; x<8; x++) {
00516 dst[x] = av_clip_uint8(( src[x-delta ] * weights[0]
00517 + src[x ] * weights[1]
00518 + src[x+delta ] * weights[2]
00519 + src[x+2*delta] * weights[3] + 64) >> 7);
00520 }
00521 src += stride;
00522 dst += stride;
00523 }
00524 }
00525
00526 static void vp6_filter_diag2(VP56Context *s, uint8_t *dst, uint8_t *src,
00527 int stride, int h_weight, int v_weight)
00528 {
00529 uint8_t *tmp = s->edge_emu_buffer+16;
00530 s->dsp.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
00531 s->dsp.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
00532 }
00533
00534 static void vp6_filter(VP56Context *s, uint8_t *dst, uint8_t *src,
00535 int offset1, int offset2, int stride,
00536 VP56mv mv, int mask, int select, int luma)
00537 {
00538 int filter4 = 0;
00539 int x8 = mv.x & mask;
00540 int y8 = mv.y & mask;
00541
00542 if (luma) {
00543 x8 *= 2;
00544 y8 *= 2;
00545 filter4 = s->filter_mode;
00546 if (filter4 == 2) {
00547 if (s->max_vector_length &&
00548 (FFABS(mv.x) > s->max_vector_length ||
00549 FFABS(mv.y) > s->max_vector_length)) {
00550 filter4 = 0;
00551 } else if (s->sample_variance_threshold
00552 && (vp6_block_variance(src+offset1, stride)
00553 < s->sample_variance_threshold)) {
00554 filter4 = 0;
00555 }
00556 }
00557 }
00558
00559 if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {
00560 offset1 = offset2;
00561 }
00562
00563 if (filter4) {
00564 if (!y8) {
00565 vp6_filter_hv4(dst, src+offset1, stride, 1,
00566 vp6_block_copy_filter[select][x8]);
00567 } else if (!x8) {
00568 vp6_filter_hv4(dst, src+offset1, stride, stride,
00569 vp6_block_copy_filter[select][y8]);
00570 } else {
00571 s->dsp.vp6_filter_diag4(dst, src+offset1+((mv.x^mv.y)>>31), stride,
00572 vp6_block_copy_filter[select][x8],
00573 vp6_block_copy_filter[select][y8]);
00574 }
00575 } else {
00576 if (!x8 || !y8) {
00577 s->dsp.put_h264_chroma_pixels_tab[0](dst, src+offset1, stride, 8, x8, y8);
00578 } else {
00579 vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);
00580 }
00581 }
00582 }
00583
00584 static av_cold int vp6_decode_init(AVCodecContext *avctx)
00585 {
00586 VP56Context *s = avctx->priv_data;
00587
00588 vp56_init(avctx, avctx->codec->id == CODEC_ID_VP6,
00589 avctx->codec->id == CODEC_ID_VP6A);
00590 s->vp56_coord_div = vp6_coord_div;
00591 s->parse_vector_adjustment = vp6_parse_vector_adjustment;
00592 s->adjust = vp6_adjust;
00593 s->filter = vp6_filter;
00594 s->default_models_init = vp6_default_models_init;
00595 s->parse_vector_models = vp6_parse_vector_models;
00596 s->parse_coeff_models = vp6_parse_coeff_models;
00597 s->parse_header = vp6_parse_header;
00598
00599 return 0;
00600 }
00601
00602 AVCodec vp6_decoder = {
00603 "vp6",
00604 CODEC_TYPE_VIDEO,
00605 CODEC_ID_VP6,
00606 sizeof(VP56Context),
00607 vp6_decode_init,
00608 NULL,
00609 vp56_free,
00610 vp56_decode_frame,
00611 CODEC_CAP_DR1,
00612 .long_name = NULL_IF_CONFIG_SMALL("On2 VP6"),
00613 };
00614
00615
00616 AVCodec vp6f_decoder = {
00617 "vp6f",
00618 CODEC_TYPE_VIDEO,
00619 CODEC_ID_VP6F,
00620 sizeof(VP56Context),
00621 vp6_decode_init,
00622 NULL,
00623 vp56_free,
00624 vp56_decode_frame,
00625 CODEC_CAP_DR1,
00626 .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version)"),
00627 };
00628
00629
00630 AVCodec vp6a_decoder = {
00631 "vp6a",
00632 CODEC_TYPE_VIDEO,
00633 CODEC_ID_VP6A,
00634 sizeof(VP56Context),
00635 vp6_decode_init,
00636 NULL,
00637 vp56_free,
00638 vp56_decode_frame,
00639 CODEC_CAP_DR1,
00640 .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"),
00641 };