1/* 2 * Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at> 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21#include "libavutil/intmath.h" 22#include "libavutil/log.h" 23#include "libavutil/opt.h" 24#include "avcodec.h" 25#include "codec_internal.h" 26#include "snow_dwt.h" 27#include "snow.h" 28 29#include "rangecoder.h" 30#include "mathops.h" 31 32static av_always_inline void predict_slice_buffered(SnowContext *s, slice_buffer * sb, IDWTELEM * old_buffer, int plane_index, int add, int mb_y){ 33 Plane *p= &s->plane[plane_index]; 34 const int mb_w= s->b_width << s->block_max_depth; 35 const int mb_h= s->b_height << s->block_max_depth; 36 int x, y, mb_x; 37 int block_size = MB_SIZE >> s->block_max_depth; 38 int block_w = plane_index ? block_size>>s->chroma_h_shift : block_size; 39 int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size; 40 const uint8_t *obmc = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth]; 41 int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size; 42 int ref_stride= s->current_picture->linesize[plane_index]; 43 uint8_t *dst8= s->current_picture->data[plane_index]; 44 int w= p->width; 45 int h= p->height; 46 47 if(s->keyframe || (s->avctx->debug&512)){ 48 if(mb_y==mb_h) 49 return; 50 51 if(add){ 52 for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){ 53// DWTELEM * line = slice_buffer_get_line(sb, y); 54 IDWTELEM * line = sb->line[y]; 55 for(x=0; x<w; x++){ 56// int v= buf[x + y*w] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1)); 57 int v= line[x] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1)); 58 v >>= FRAC_BITS; 59 if(v&(~255)) v= ~(v>>31); 60 dst8[x + y*ref_stride]= v; 61 } 62 } 63 }else{ 64 for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){ 65// DWTELEM * line = slice_buffer_get_line(sb, y); 66 IDWTELEM * line = sb->line[y]; 67 for(x=0; x<w; x++){ 68 line[x] -= 128 << FRAC_BITS; 69// buf[x + y*w]-= 128<<FRAC_BITS; 70 } 71 } 72 } 73 74 return; 75 } 76 77 for(mb_x=0; mb_x<=mb_w; mb_x++){ 78 add_yblock(s, 1, sb, old_buffer, dst8, obmc, 79 block_w*mb_x - block_w/2, 80 block_h*mb_y - block_h/2, 81 block_w, block_h, 82 w, h, 83 w, ref_stride, obmc_stride, 84 mb_x - 1, mb_y - 1, 85 add, 0, plane_index); 86 } 87 88 if(s->avmv && mb_y < mb_h && plane_index == 0) 89 for(mb_x=0; mb_x<mb_w; mb_x++){ 90 AVMotionVector *avmv = s->avmv + s->avmv_index; 91 const int b_width = s->b_width << s->block_max_depth; 92 const int b_stride= b_width; 93 BlockNode *bn= &s->block[mb_x + mb_y*b_stride]; 94 95 if (bn->type) 96 continue; 97 98 s->avmv_index++; 99 100 avmv->w = block_w; 101 avmv->h = block_h; 102 avmv->dst_x = block_w*mb_x - block_w/2; 103 avmv->dst_y = block_h*mb_y - block_h/2; 104 avmv->motion_scale = 8; 105 avmv->motion_x = bn->mx * s->mv_scale; 106 avmv->motion_y = bn->my * s->mv_scale; 107 avmv->src_x = avmv->dst_x + avmv->motion_x / 8; 108 avmv->src_y = avmv->dst_y + avmv->motion_y / 8; 109 avmv->source= -1 - bn->ref; 110 avmv->flags = 0; 111 } 112} 113 114static inline void decode_subband_slice_buffered(SnowContext *s, SubBand *b, slice_buffer * sb, int start_y, int h, int save_state[1]){ 115 const int w= b->width; 116 int y; 117 const int qlog= av_clip(s->qlog + (int64_t)b->qlog, 0, QROOT*16); 118 int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT); 119 int qadd= (s->qbias*qmul)>>QBIAS_SHIFT; 120 int new_index = 0; 121 122 if(b->ibuf == s->spatial_idwt_buffer || s->qlog == LOSSLESS_QLOG){ 123 qadd= 0; 124 qmul= 1<<QEXPSHIFT; 125 } 126 127 /* If we are on the second or later slice, restore our index. */ 128 if (start_y != 0) 129 new_index = save_state[0]; 130 131 132 for(y=start_y; y<h; y++){ 133 int x = 0; 134 int v; 135 IDWTELEM * line = slice_buffer_get_line(sb, y * b->stride_line + b->buf_y_offset) + b->buf_x_offset; 136 memset(line, 0, b->width*sizeof(IDWTELEM)); 137 v = b->x_coeff[new_index].coeff; 138 x = b->x_coeff[new_index++].x; 139 while(x < w){ 140 register int t= (int)( (v>>1)*(unsigned)qmul + qadd)>>QEXPSHIFT; 141 register int u= -(v&1); 142 line[x] = (t^u) - u; 143 144 v = b->x_coeff[new_index].coeff; 145 x = b->x_coeff[new_index++].x; 146 } 147 } 148 149 /* Save our variables for the next slice. */ 150 save_state[0] = new_index; 151 152 return; 153} 154 155static int decode_q_branch(SnowContext *s, int level, int x, int y){ 156 const int w= s->b_width << s->block_max_depth; 157 const int rem_depth= s->block_max_depth - level; 158 const int index= (x + y*w) << rem_depth; 159 int trx= (x+1)<<rem_depth; 160 const BlockNode *left = x ? &s->block[index-1] : &null_block; 161 const BlockNode *top = y ? &s->block[index-w] : &null_block; 162 const BlockNode *tl = y && x ? &s->block[index-w-1] : left; 163 const BlockNode *tr = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt 164 int s_context= 2*left->level + 2*top->level + tl->level + tr->level; 165 int res; 166 167 if(s->keyframe){ 168 set_blocks(s, level, x, y, null_block.color[0], null_block.color[1], null_block.color[2], null_block.mx, null_block.my, null_block.ref, BLOCK_INTRA); 169 return 0; 170 } 171 172 if(level==s->block_max_depth || get_rac(&s->c, &s->block_state[4 + s_context])){ 173 int type, mx, my; 174 int l = left->color[0]; 175 int cb= left->color[1]; 176 int cr= left->color[2]; 177 unsigned ref = 0; 178 int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref); 179 int mx_context= av_log2(2*FFABS(left->mx - top->mx)) + 0*av_log2(2*FFABS(tr->mx - top->mx)); 180 int my_context= av_log2(2*FFABS(left->my - top->my)) + 0*av_log2(2*FFABS(tr->my - top->my)); 181 182 type= get_rac(&s->c, &s->block_state[1 + left->type + top->type]) ? BLOCK_INTRA : 0; 183 if(type){ 184 int ld, cbd, crd; 185 pred_mv(s, &mx, &my, 0, left, top, tr); 186 ld = get_symbol(&s->c, &s->block_state[32], 1); 187 if (ld < -255 || ld > 255) { 188 return AVERROR_INVALIDDATA; 189 } 190 l += ld; 191 if (s->nb_planes > 2) { 192 cbd = get_symbol(&s->c, &s->block_state[64], 1); 193 crd = get_symbol(&s->c, &s->block_state[96], 1); 194 if (cbd < -255 || cbd > 255 || crd < -255 || crd > 255) { 195 return AVERROR_INVALIDDATA; 196 } 197 cb += cbd; 198 cr += crd; 199 } 200 }else{ 201 if(s->ref_frames > 1) 202 ref= get_symbol(&s->c, &s->block_state[128 + 1024 + 32*ref_context], 0); 203 if (ref >= s->ref_frames) { 204 av_log(s->avctx, AV_LOG_ERROR, "Invalid ref\n"); 205 return AVERROR_INVALIDDATA; 206 } 207 pred_mv(s, &mx, &my, ref, left, top, tr); 208 mx+= (unsigned)get_symbol(&s->c, &s->block_state[128 + 32*(mx_context + 16*!!ref)], 1); 209 my+= (unsigned)get_symbol(&s->c, &s->block_state[128 + 32*(my_context + 16*!!ref)], 1); 210 } 211 set_blocks(s, level, x, y, l, cb, cr, mx, my, ref, type); 212 }else{ 213 if ((res = decode_q_branch(s, level+1, 2*x+0, 2*y+0)) < 0 || 214 (res = decode_q_branch(s, level+1, 2*x+1, 2*y+0)) < 0 || 215 (res = decode_q_branch(s, level+1, 2*x+0, 2*y+1)) < 0 || 216 (res = decode_q_branch(s, level+1, 2*x+1, 2*y+1)) < 0) 217 return res; 218 } 219 return 0; 220} 221 222static void dequantize_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int start_y, int end_y){ 223 const int w= b->width; 224 const int qlog= av_clip(s->qlog + (int64_t)b->qlog, 0, QROOT*16); 225 const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT); 226 const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT; 227 int x,y; 228 229 if(s->qlog == LOSSLESS_QLOG) return; 230 231 for(y=start_y; y<end_y; y++){ 232// DWTELEM * line = slice_buffer_get_line_from_address(sb, src + (y * stride)); 233 IDWTELEM * line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset; 234 for(x=0; x<w; x++){ 235 int i= line[x]; 236 if(i<0){ 237 line[x]= -((-i*(unsigned)qmul + qadd)>>(QEXPSHIFT)); //FIXME try different bias 238 }else if(i>0){ 239 line[x]= (( i*(unsigned)qmul + qadd)>>(QEXPSHIFT)); 240 } 241 } 242 } 243} 244 245static void correlate_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int inverse, int use_median, int start_y, int end_y){ 246 const int w= b->width; 247 int x,y; 248 249 IDWTELEM * line=0; // silence silly "could be used without having been initialized" warning 250 IDWTELEM * prev; 251 252 if (start_y != 0) 253 line = slice_buffer_get_line(sb, ((start_y - 1) * b->stride_line) + b->buf_y_offset) + b->buf_x_offset; 254 255 for(y=start_y; y<end_y; y++){ 256 prev = line; 257// line = slice_buffer_get_line_from_address(sb, src + (y * stride)); 258 line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset; 259 for(x=0; x<w; x++){ 260 if(x){ 261 if(use_median){ 262 if(y && x+1<w) line[x] += mid_pred(line[x - 1], prev[x], prev[x + 1]); 263 else line[x] += line[x - 1]; 264 }else{ 265 if(y) line[x] += mid_pred(line[x - 1], prev[x], line[x - 1] + prev[x] - prev[x - 1]); 266 else line[x] += line[x - 1]; 267 } 268 }else{ 269 if(y) line[x] += prev[x]; 270 } 271 } 272 } 273} 274 275static void decode_qlogs(SnowContext *s){ 276 int plane_index, level, orientation; 277 278 for(plane_index=0; plane_index < s->nb_planes; plane_index++){ 279 for(level=0; level<s->spatial_decomposition_count; level++){ 280 for(orientation=level ? 1:0; orientation<4; orientation++){ 281 int q; 282 if (plane_index==2) q= s->plane[1].band[level][orientation].qlog; 283 else if(orientation==2) q= s->plane[plane_index].band[level][1].qlog; 284 else q= get_symbol(&s->c, s->header_state, 1); 285 s->plane[plane_index].band[level][orientation].qlog= q; 286 } 287 } 288 } 289} 290 291#define GET_S(dst, check) \ 292 tmp= get_symbol(&s->c, s->header_state, 0);\ 293 if(!(check)){\ 294 av_log(s->avctx, AV_LOG_ERROR, "Error " #dst " is %d\n", tmp);\ 295 return AVERROR_INVALIDDATA;\ 296 }\ 297 dst= tmp; 298 299static int decode_header(SnowContext *s){ 300 int plane_index, tmp; 301 uint8_t kstate[32]; 302 303 memset(kstate, MID_STATE, sizeof(kstate)); 304 305 s->keyframe= get_rac(&s->c, kstate); 306 if(s->keyframe || s->always_reset){ 307 ff_snow_reset_contexts(s); 308 s->spatial_decomposition_type= 309 s->qlog= 310 s->qbias= 311 s->mv_scale= 312 s->block_max_depth= 0; 313 } 314 if(s->keyframe){ 315 GET_S(s->version, tmp <= 0U) 316 s->always_reset= get_rac(&s->c, s->header_state); 317 s->temporal_decomposition_type= get_symbol(&s->c, s->header_state, 0); 318 s->temporal_decomposition_count= get_symbol(&s->c, s->header_state, 0); 319 GET_S(s->spatial_decomposition_count, 0 < tmp && tmp <= MAX_DECOMPOSITIONS) 320 s->colorspace_type= get_symbol(&s->c, s->header_state, 0); 321 if (s->colorspace_type == 1) { 322 s->avctx->pix_fmt= AV_PIX_FMT_GRAY8; 323 s->nb_planes = 1; 324 } else if(s->colorspace_type == 0) { 325 s->chroma_h_shift= get_symbol(&s->c, s->header_state, 0); 326 s->chroma_v_shift= get_symbol(&s->c, s->header_state, 0); 327 328 if(s->chroma_h_shift == 1 && s->chroma_v_shift==1){ 329 s->avctx->pix_fmt= AV_PIX_FMT_YUV420P; 330 }else if(s->chroma_h_shift == 0 && s->chroma_v_shift==0){ 331 s->avctx->pix_fmt= AV_PIX_FMT_YUV444P; 332 }else if(s->chroma_h_shift == 2 && s->chroma_v_shift==2){ 333 s->avctx->pix_fmt= AV_PIX_FMT_YUV410P; 334 } else { 335 av_log(s, AV_LOG_ERROR, "unsupported color subsample mode %d %d\n", s->chroma_h_shift, s->chroma_v_shift); 336 s->chroma_h_shift = s->chroma_v_shift = 1; 337 s->avctx->pix_fmt= AV_PIX_FMT_YUV420P; 338 return AVERROR_INVALIDDATA; 339 } 340 s->nb_planes = 3; 341 } else { 342 av_log(s, AV_LOG_ERROR, "unsupported color space\n"); 343 s->chroma_h_shift = s->chroma_v_shift = 1; 344 s->avctx->pix_fmt= AV_PIX_FMT_YUV420P; 345 return AVERROR_INVALIDDATA; 346 } 347 348 349 s->spatial_scalability= get_rac(&s->c, s->header_state); 350// s->rate_scalability= get_rac(&s->c, s->header_state); 351 GET_S(s->max_ref_frames, tmp < (unsigned)MAX_REF_FRAMES) 352 s->max_ref_frames++; 353 354 decode_qlogs(s); 355 } 356 357 if(!s->keyframe){ 358 if(get_rac(&s->c, s->header_state)){ 359 for(plane_index=0; plane_index<FFMIN(s->nb_planes, 2); plane_index++){ 360 int htaps, i, sum=0; 361 Plane *p= &s->plane[plane_index]; 362 p->diag_mc= get_rac(&s->c, s->header_state); 363 htaps= get_symbol(&s->c, s->header_state, 0); 364 if((unsigned)htaps >= HTAPS_MAX/2 - 1) 365 return AVERROR_INVALIDDATA; 366 htaps = htaps*2 + 2; 367 p->htaps= htaps; 368 for(i= htaps/2; i; i--){ 369 unsigned hcoeff = get_symbol(&s->c, s->header_state, 0); 370 if (hcoeff > 127) 371 return AVERROR_INVALIDDATA; 372 p->hcoeff[i]= hcoeff * (1-2*(i&1)); 373 sum += p->hcoeff[i]; 374 } 375 p->hcoeff[0]= 32-sum; 376 } 377 s->plane[2].diag_mc= s->plane[1].diag_mc; 378 s->plane[2].htaps = s->plane[1].htaps; 379 memcpy(s->plane[2].hcoeff, s->plane[1].hcoeff, sizeof(s->plane[1].hcoeff)); 380 } 381 if(get_rac(&s->c, s->header_state)){ 382 GET_S(s->spatial_decomposition_count, 0 < tmp && tmp <= MAX_DECOMPOSITIONS) 383 decode_qlogs(s); 384 } 385 } 386 387 s->spatial_decomposition_type+= (unsigned)get_symbol(&s->c, s->header_state, 1); 388 if(s->spatial_decomposition_type > 1U){ 389 av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_type %d not supported\n", s->spatial_decomposition_type); 390 return AVERROR_INVALIDDATA; 391 } 392 if(FFMIN(s->avctx-> width>>s->chroma_h_shift, 393 s->avctx->height>>s->chroma_v_shift) >> (s->spatial_decomposition_count-1) <= 1){ 394 av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_count %d too large for size\n", s->spatial_decomposition_count); 395 return AVERROR_INVALIDDATA; 396 } 397 if (s->avctx->width > 65536-4) { 398 av_log(s->avctx, AV_LOG_ERROR, "Width %d is too large\n", s->avctx->width); 399 return AVERROR_INVALIDDATA; 400 } 401 402 403 s->qlog += (unsigned)get_symbol(&s->c, s->header_state, 1); 404 s->mv_scale += (unsigned)get_symbol(&s->c, s->header_state, 1); 405 s->qbias += (unsigned)get_symbol(&s->c, s->header_state, 1); 406 s->block_max_depth+= (unsigned)get_symbol(&s->c, s->header_state, 1); 407 if(s->block_max_depth > 1 || s->block_max_depth < 0 || s->mv_scale > 256U){ 408 av_log(s->avctx, AV_LOG_ERROR, "block_max_depth= %d is too large\n", s->block_max_depth); 409 s->block_max_depth= 0; 410 s->mv_scale = 0; 411 return AVERROR_INVALIDDATA; 412 } 413 if (FFABS(s->qbias) > 127) { 414 av_log(s->avctx, AV_LOG_ERROR, "qbias %d is too large\n", s->qbias); 415 s->qbias = 0; 416 return AVERROR_INVALIDDATA; 417 } 418 419 return 0; 420} 421 422static int decode_blocks(SnowContext *s){ 423 int x, y; 424 int w= s->b_width; 425 int h= s->b_height; 426 int res; 427 428 for(y=0; y<h; y++){ 429 for(x=0; x<w; x++){ 430 if (s->c.bytestream >= s->c.bytestream_end) 431 return AVERROR_INVALIDDATA; 432 if ((res = decode_q_branch(s, 0, x, y)) < 0) 433 return res; 434 } 435 } 436 return 0; 437} 438 439static int decode_frame(AVCodecContext *avctx, AVFrame *picture, 440 int *got_frame, AVPacket *avpkt) 441{ 442 const uint8_t *buf = avpkt->data; 443 int buf_size = avpkt->size; 444 SnowContext *s = avctx->priv_data; 445 RangeCoder * const c= &s->c; 446 int bytes_read; 447 int level, orientation, plane_index; 448 int res; 449 450 ff_init_range_decoder(c, buf, buf_size); 451 ff_build_rac_states(c, 0.05*(1LL<<32), 256-8); 452 453 s->current_picture->pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P 454 if ((res = decode_header(s)) < 0) 455 return res; 456 if ((res=ff_snow_common_init_after_header(avctx)) < 0) 457 return res; 458 459 // realloc slice buffer for the case that spatial_decomposition_count changed 460 ff_slice_buffer_destroy(&s->sb); 461 if ((res = ff_slice_buffer_init(&s->sb, s->plane[0].height, 462 (MB_SIZE >> s->block_max_depth) + 463 s->spatial_decomposition_count * 11 + 1, 464 s->plane[0].width, 465 s->spatial_idwt_buffer)) < 0) 466 return res; 467 468 for(plane_index=0; plane_index < s->nb_planes; plane_index++){ 469 Plane *p= &s->plane[plane_index]; 470 p->fast_mc= p->diag_mc && p->htaps==6 && p->hcoeff[0]==40 471 && p->hcoeff[1]==-10 472 && p->hcoeff[2]==2; 473 } 474 475 ff_snow_alloc_blocks(s); 476 477 if((res = ff_snow_frame_start(s)) < 0) 478 return res; 479 480 s->current_picture->pict_type = s->keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; 481 482 //keyframe flag duplication mess FIXME 483 if(avctx->debug&FF_DEBUG_PICT_INFO) 484 av_log(avctx, AV_LOG_ERROR, 485 "keyframe:%d qlog:%d qbias: %d mvscale: %d " 486 "decomposition_type:%d decomposition_count:%d\n", 487 s->keyframe, s->qlog, s->qbias, s->mv_scale, 488 s->spatial_decomposition_type, 489 s->spatial_decomposition_count 490 ); 491 492 if (s->avctx->export_side_data & AV_CODEC_EXPORT_DATA_MVS) { 493 size_t size; 494 res = av_size_mult(s->b_width * s->b_height, sizeof(AVMotionVector) << (s->block_max_depth*2), &size); 495 if (res) 496 return res; 497 av_fast_malloc(&s->avmv, &s->avmv_size, size); 498 if (!s->avmv) 499 return AVERROR(ENOMEM); 500 } else { 501 s->avmv_size = 0; 502 av_freep(&s->avmv); 503 } 504 s->avmv_index = 0; 505 506 if ((res = decode_blocks(s)) < 0) 507 return res; 508 509 for(plane_index=0; plane_index < s->nb_planes; plane_index++){ 510 Plane *p= &s->plane[plane_index]; 511 int w= p->width; 512 int h= p->height; 513 int x, y; 514 int decode_state[MAX_DECOMPOSITIONS][4][1]; /* Stored state info for unpack_coeffs. 1 variable per instance. */ 515 516 if(s->avctx->debug&2048){ 517 memset(s->spatial_dwt_buffer, 0, sizeof(DWTELEM)*w*h); 518 predict_plane(s, s->spatial_idwt_buffer, plane_index, 1); 519 520 for(y=0; y<h; y++){ 521 for(x=0; x<w; x++){ 522 int v= s->current_picture->data[plane_index][y*s->current_picture->linesize[plane_index] + x]; 523 s->mconly_picture->data[plane_index][y*s->mconly_picture->linesize[plane_index] + x]= v; 524 } 525 } 526 } 527 528 for(level=0; level<s->spatial_decomposition_count; level++){ 529 for(orientation=level ? 1 : 0; orientation<4; orientation++){ 530 SubBand *b= &p->band[level][orientation]; 531 unpack_coeffs(s, b, b->parent, orientation); 532 } 533 } 534 535 { 536 const int mb_h= s->b_height << s->block_max_depth; 537 const int block_size = MB_SIZE >> s->block_max_depth; 538 const int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size; 539 int mb_y; 540 DWTCompose cs[MAX_DECOMPOSITIONS]; 541 int yd=0, yq=0; 542 int y; 543 int end_y; 544 545 ff_spatial_idwt_buffered_init(cs, &s->sb, w, h, 1, s->spatial_decomposition_type, s->spatial_decomposition_count); 546 for(mb_y=0; mb_y<=mb_h; mb_y++){ 547 548 int slice_starty = block_h*mb_y; 549 int slice_h = block_h*(mb_y+1); 550 551 if (!(s->keyframe || s->avctx->debug&512)){ 552 slice_starty = FFMAX(0, slice_starty - (block_h >> 1)); 553 slice_h -= (block_h >> 1); 554 } 555 556 for(level=0; level<s->spatial_decomposition_count; level++){ 557 for(orientation=level ? 1 : 0; orientation<4; orientation++){ 558 SubBand *b= &p->band[level][orientation]; 559 int start_y; 560 int end_y; 561 int our_mb_start = mb_y; 562 int our_mb_end = (mb_y + 1); 563 const int extra= 3; 564 start_y = (mb_y ? ((block_h * our_mb_start) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra: 0); 565 end_y = (((block_h * our_mb_end) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra); 566 if (!(s->keyframe || s->avctx->debug&512)){ 567 start_y = FFMAX(0, start_y - (block_h >> (1+s->spatial_decomposition_count - level))); 568 end_y = FFMAX(0, end_y - (block_h >> (1+s->spatial_decomposition_count - level))); 569 } 570 start_y = FFMIN(b->height, start_y); 571 end_y = FFMIN(b->height, end_y); 572 573 if (start_y != end_y){ 574 if (orientation == 0){ 575 SubBand * correlate_band = &p->band[0][0]; 576 int correlate_end_y = FFMIN(b->height, end_y + 1); 577 int correlate_start_y = FFMIN(b->height, (start_y ? start_y + 1 : 0)); 578 decode_subband_slice_buffered(s, correlate_band, &s->sb, correlate_start_y, correlate_end_y, decode_state[0][0]); 579 correlate_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, 1, 0, correlate_start_y, correlate_end_y); 580 dequantize_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, start_y, end_y); 581 } 582 else 583 decode_subband_slice_buffered(s, b, &s->sb, start_y, end_y, decode_state[level][orientation]); 584 } 585 } 586 } 587 588 for(; yd<slice_h; yd+=4){ 589 ff_spatial_idwt_buffered_slice(&s->dwt, cs, &s->sb, s->temp_idwt_buffer, w, h, 1, s->spatial_decomposition_type, s->spatial_decomposition_count, yd); 590 } 591 592 if(s->qlog == LOSSLESS_QLOG){ 593 for(; yq<slice_h && yq<h; yq++){ 594 IDWTELEM * line = slice_buffer_get_line(&s->sb, yq); 595 for(x=0; x<w; x++){ 596 line[x] *= 1<<FRAC_BITS; 597 } 598 } 599 } 600 601 predict_slice_buffered(s, &s->sb, s->spatial_idwt_buffer, plane_index, 1, mb_y); 602 603 y = FFMIN(p->height, slice_starty); 604 end_y = FFMIN(p->height, slice_h); 605 while(y < end_y) 606 ff_slice_buffer_release(&s->sb, y++); 607 } 608 609 ff_slice_buffer_flush(&s->sb); 610 } 611 612 } 613 614 emms_c(); 615 616 ff_snow_release_buffer(avctx); 617 618 if(!(s->avctx->debug&2048)) 619 res = av_frame_ref(picture, s->current_picture); 620 else 621 res = av_frame_ref(picture, s->mconly_picture); 622 if (res >= 0 && s->avmv_index) { 623 AVFrameSideData *sd; 624 625 sd = av_frame_new_side_data(picture, AV_FRAME_DATA_MOTION_VECTORS, s->avmv_index * sizeof(AVMotionVector)); 626 if (!sd) 627 return AVERROR(ENOMEM); 628 memcpy(sd->data, s->avmv, s->avmv_index * sizeof(AVMotionVector)); 629 } 630 631 if (res < 0) 632 return res; 633 634 *got_frame = 1; 635 636 bytes_read= c->bytestream - c->bytestream_start; 637 if(bytes_read ==0) av_log(s->avctx, AV_LOG_ERROR, "error at end of frame\n"); //FIXME 638 639 return bytes_read; 640} 641 642static av_cold int decode_end(AVCodecContext *avctx) 643{ 644 SnowContext *s = avctx->priv_data; 645 646 ff_slice_buffer_destroy(&s->sb); 647 648 ff_snow_common_end(s); 649 650 s->avmv_size = 0; 651 av_freep(&s->avmv); 652 653 return 0; 654} 655 656const FFCodec ff_snow_decoder = { 657 .p.name = "snow", 658 .p.long_name = NULL_IF_CONFIG_SMALL("Snow"), 659 .p.type = AVMEDIA_TYPE_VIDEO, 660 .p.id = AV_CODEC_ID_SNOW, 661 .priv_data_size = sizeof(SnowContext), 662 .init = ff_snow_common_init, 663 .close = decode_end, 664 FF_CODEC_DECODE_CB(decode_frame), 665 .p.capabilities = AV_CODEC_CAP_DR1 /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/, 666 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | 667 FF_CODEC_CAP_INIT_CLEANUP, 668}; 669