FFmpeg: libavcodec/snowdec.c Source File

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libavcodec

snowdec.c

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1 /*

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 */

21 #include "libavutil/intmath.h"

22 #include "libavutil/log.h"

23 #include "libavutil/opt.h"

24 #include "avcodec.h"

25 #include "snow_dwt.h"

26 #include "internal.h"

27 #include "snow.h"

29 #include "rangecoder.h"

30 #include "mathops.h"

32 #include "mpegvideo.h"

33 #include "h263.h"

35 static av_always_inline void predict_slice_buffered(SnowContext *s, slice_buffer * sb, IDWTELEM * old_buffer, int plane_index, int add, int mb_y){

36 Plane *p= &s->plane[plane_index];

37 const int mb_w= s->b_width << s->block_max_depth;

38 const int mb_h= s->b_height << s->block_max_depth;

39 int x, y, mb_x;

40 int block_size = MB_SIZE >> s->block_max_depth;

41 int block_w = plane_index ? block_size>>s->chroma_h_shift : block_size;

42 int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size;

43 const uint8_t *obmc = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth];

44 int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;

45 int ref_stride= s->current_picture->linesize[plane_index];

46 uint8_t *dst8= s->current_picture->data[plane_index];

47 int w= p->width;

48 int h= p->height;

50 if(s->keyframe || (s->avctx->debug&512)){

51 if(mb_y==mb_h)

52 return;

54 if(add){

55 for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){

56 // DWTELEM * line = slice_buffer_get_line(sb, y);

57 IDWTELEM * line = sb->line[y];

58 for(x=0; x<w; x++){

59 // int v= buf[x + y*w] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1));

60 int v= line[x] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1));

61 v >>= FRAC_BITS;

62 if(v&(~255)) v= ~(v>>31);

63 dst8[x + y*ref_stride]= v;

64 }

65 }

66 }else{

67 for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){

68 // DWTELEM * line = slice_buffer_get_line(sb, y);

69 IDWTELEM * line = sb->line[y];

70 for(x=0; x<w; x++){

71 line[x] -= 128 << FRAC_BITS;

72 // buf[x + y*w]-= 128<<FRAC_BITS;

73 }

74 }

75 }

77 return;

78 }

80 for(mb_x=0; mb_x<=mb_w; mb_x++){

81 add_yblock(s, 1, sb, old_buffer, dst8, obmc,

82 block_w*mb_x - block_w/2,

83 block_h*mb_y - block_h/2,

84 block_w, block_h,

85 w, h,

86 w, ref_stride, obmc_stride,

87 mb_x - 1, mb_y - 1,

88 add, 0, plane_index);

89 }

91 if(s->avmv && mb_y < mb_h && plane_index == 0)

92 for(mb_x=0; mb_x<mb_w; mb_x++){

93 AVMotionVector *avmv = s->avmv + s->avmv_index;

94 const int b_width = s->b_width << s->block_max_depth;

95 const int b_stride= b_width;

96 BlockNode *bn= &s->block[mb_x + mb_y*b_stride];

98 if (bn->type)

99 continue;

100

101 s->avmv_index++;

102

103 avmv->w = block_w;

104 avmv->h = block_h;

105 avmv->dst_x = block_w*mb_x - block_w/2;

106 avmv->dst_y = block_h*mb_y - block_h/2;

107 avmv->src_x = avmv->dst_x + (bn->mx * s->mv_scale)/8;

108 avmv->src_y = avmv->dst_y + (bn->my * s->mv_scale)/8;

109 avmv->source= -1 - bn->ref;

110 avmv->flags = 0;

111 }

112 }

113

114 static 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 + 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= ( (v>>1)*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

155 static 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

184 if(type){

185 pred_mv(s, &mx, &my, 0, left, top, tr);

186 l += get_symbol(&s->c, &s->block_state[32], 1);

187 if (s->nb_planes > 2) {

188 cb+= get_symbol(&s->c, &s->block_state[64], 1);

189 cr+= get_symbol(&s->c, &s->block_state[96], 1);

190 }

191 }else{

192 if(s->ref_frames > 1)

193 ref= get_symbol(&s->c, &s->block_state[128 + 1024 + 32*ref_context], 0);

194 if (ref >= s->ref_frames) {

195 av_log(s->avctx, AV_LOG_ERROR, "Invalid ref\n");

196 return AVERROR_INVALIDDATA;

197 }

198 pred_mv(s, &mx, &my, ref, left, top, tr);

199 mx+= get_symbol(&s->c, &s->block_state[128 + 32*(mx_context + 16*!!ref)], 1);

200 my+= get_symbol(&s->c, &s->block_state[128 + 32*(my_context + 16*!!ref)], 1);

201 }

202 set_blocks(s, level, x, y, l, cb, cr, mx, my, ref, type);

203 }else{

204 if ((res = decode_q_branch(s, level+1, 2*x+0, 2*y+0)) < 0 ||

205 (res = decode_q_branch(s, level+1, 2*x+1, 2*y+0)) < 0 ||

206 (res = decode_q_branch(s, level+1, 2*x+0, 2*y+1)) < 0 ||

207 (res = decode_q_branch(s, level+1, 2*x+1, 2*y+1)) < 0)

208 return res;

209 }

210 return 0;

211 }

212

213 static void dequantize_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int start_y, int end_y){

214 const int w= b->width;

215 const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);

216 const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);

217 const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;

218 int x,y;

219

220 if(s->qlog == LOSSLESS_QLOG) return;

221

222 for(y=start_y; y<end_y; y++){

223 // DWTELEM * line = slice_buffer_get_line_from_address(sb, src + (y * stride));

224 IDWTELEM * line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;

225 for(x=0; x<w; x++){

226 int i= line[x];

227 if(i<0){

228 line[x]= -((-i*qmul + qadd)>>(QEXPSHIFT)); //FIXME try different bias

229 }else if(i>0){

230 line[x]= (( i*qmul + qadd)>>(QEXPSHIFT));

231 }

232 }

233 }

234 }

235

236 static 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){

237 const int w= b->width;

238 int x,y;

239

240 IDWTELEM * line=0; // silence silly "could be used without having been initialized" warning

241 IDWTELEM * prev;

242

243 if (start_y != 0)

244 line = slice_buffer_get_line(sb, ((start_y - 1) * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;

245

246 for(y=start_y; y<end_y; y++){

247 prev = line;

248 // line = slice_buffer_get_line_from_address(sb, src + (y * stride));

249 line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;

250 for(x=0; x<w; x++){

251 if(x){

252 if(use_median){

253 if(y && x+1<w) line[x] += mid_pred(line[x - 1], prev[x], prev[x + 1]);

254 else line[x] += line[x - 1];

255 }else{

256 if(y) line[x] += mid_pred(line[x - 1], prev[x], line[x - 1] + prev[x] - prev[x - 1]);

257 else line[x] += line[x - 1];

258 }

259 }else{

260 if(y) line[x] += prev[x];

261 }

262 }

263 }

264 }

265

266 static void decode_qlogs(SnowContext *s){

267 int plane_index, level, orientation;

268

269 for(plane_index=0; plane_index < s->nb_planes; plane_index++){

270 for(level=0; level<s->spatial_decomposition_count; level++){

271 for(orientation=level ? 1:0; orientation<4; orientation++){

272 int q;

273 if (plane_index==2) q= s->plane[1].band[level][orientation].qlog;

274 else if(orientation==2) q= s->plane[plane_index].band[level][1].qlog;

275 else q= get_symbol(&s->c, s->header_state, 1);

276 s->plane[plane_index].band[level][orientation].qlog= q;

277 }

278 }

279 }

280 }

281

282 #define GET_S(dst, check) \

283 tmp= get_symbol(&s->c, s->header_state, 0);\

284 if(!(check)){\

285 av_log(s->avctx, AV_LOG_ERROR, "Error " #dst " is %d\n", tmp);\

286 return AVERROR_INVALIDDATA;\

287 }\

288 dst= tmp;

289

290 static int decode_header(SnowContext *s){

291 int plane_index, tmp;

292 uint8_t kstate[32];

293

294 memset(kstate, MID_STATE, sizeof(kstate));

295

296 s->keyframe= get_rac(&s->c, kstate);

297 if(s->keyframe || s->always_reset){

298 ff_snow_reset_contexts(s);

299 s->spatial_decomposition_type=

300 s->qlog=

301 s->qbias=

302 s->mv_scale=

303 s->block_max_depth= 0;

304 }

305 if(s->keyframe){

306 GET_S(s->version, tmp <= 0U)

307 s->always_reset= get_rac(&s->c, s->header_state);

308 s->temporal_decomposition_type= get_symbol(&s->c, s->header_state, 0);

309 s->temporal_decomposition_count= get_symbol(&s->c, s->header_state, 0);

310 GET_S(s->spatial_decomposition_count, 0 < tmp && tmp <= MAX_DECOMPOSITIONS)

311 s->colorspace_type= get_symbol(&s->c, s->header_state, 0);

312 if (s->colorspace_type == 1) {

313 s->avctx->pix_fmt= AV_PIX_FMT_GRAY8;

314 s->nb_planes = 1;

315 } else if(s->colorspace_type == 0) {

316 s->chroma_h_shift= get_symbol(&s->c, s->header_state, 0);

317 s->chroma_v_shift= get_symbol(&s->c, s->header_state, 0);

318

319 if(s->chroma_h_shift == 1 && s->chroma_v_shift==1){

320 s->avctx->pix_fmt= AV_PIX_FMT_YUV420P;

321 }else if(s->chroma_h_shift == 0 && s->chroma_v_shift==0){

322 s->avctx->pix_fmt= AV_PIX_FMT_YUV444P;

323 }else if(s->chroma_h_shift == 2 && s->chroma_v_shift==2){

324 s->avctx->pix_fmt= AV_PIX_FMT_YUV410P;

325 } else {

326 av_log(s, AV_LOG_ERROR, "unsupported color subsample mode %d %d\n", s->chroma_h_shift, s->chroma_v_shift);

327 s->chroma_h_shift = s->chroma_v_shift = 1;

328 s->avctx->pix_fmt= AV_PIX_FMT_YUV420P;

329 return AVERROR_INVALIDDATA;

330 }

331 s->nb_planes = 3;

332 } else {

333 av_log(s, AV_LOG_ERROR, "unsupported color space\n");

334 s->chroma_h_shift = s->chroma_v_shift = 1;

335 s->avctx->pix_fmt= AV_PIX_FMT_YUV420P;

336 return AVERROR_INVALIDDATA;

337 }

338

339

340 s->spatial_scalability= get_rac(&s->c, s->header_state);

341 // s->rate_scalability= get_rac(&s->c, s->header_state);

342 GET_S(s->max_ref_frames, tmp < (unsigned)MAX_REF_FRAMES)

343 s->max_ref_frames++;

344

345 decode_qlogs(s);

346 }

347

348 if(!s->keyframe){

349 if(get_rac(&s->c, s->header_state)){

350 for(plane_index=0; plane_index<FFMIN(s->nb_planes, 2); plane_index++){

351 int htaps, i, sum=0;

352 Plane *p= &s->plane[plane_index];

353 p->diag_mc= get_rac(&s->c, s->header_state);

354 htaps= get_symbol(&s->c, s->header_state, 0)*2 + 2;

355 if((unsigned)htaps > HTAPS_MAX || htaps==0)

356 return AVERROR_INVALIDDATA;

357 p->htaps= htaps;

358 for(i= htaps/2; i; i--){

359 p->hcoeff[i]= get_symbol(&s->c, s->header_state, 0) * (1-2*(i&1));

360 sum += p->hcoeff[i];

361 }

362 p->hcoeff[0]= 32-sum;

363 }

364 s->plane[2].diag_mc= s->plane[1].diag_mc;

365 s->plane[2].htaps = s->plane[1].htaps;

366 memcpy(s->plane[2].hcoeff, s->plane[1].hcoeff, sizeof(s->plane[1].hcoeff));

367 }

368 if(get_rac(&s->c, s->header_state)){

369 GET_S(s->spatial_decomposition_count, 0 < tmp && tmp <= MAX_DECOMPOSITIONS)

370 decode_qlogs(s);

371 }

372 }

373

374 s->spatial_decomposition_type+= get_symbol(&s->c, s->header_state, 1);

375 if(s->spatial_decomposition_type > 1U){

376 av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_type %d not supported\n", s->spatial_decomposition_type);

377 return AVERROR_INVALIDDATA;

378 }

379 if(FFMIN(s->avctx-> width>>s->chroma_h_shift,

380 s->avctx->height>>s->chroma_v_shift) >> (s->spatial_decomposition_count-1) <= 1){

381 av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_count %d too large for size\n", s->spatial_decomposition_count);

382 return AVERROR_INVALIDDATA;

383 }

384

385

386 s->qlog += get_symbol(&s->c, s->header_state, 1);

387 s->mv_scale += get_symbol(&s->c, s->header_state, 1);

388 s->qbias += get_symbol(&s->c, s->header_state, 1);

389 s->block_max_depth+= get_symbol(&s->c, s->header_state, 1);

390 if(s->block_max_depth > 1 || s->block_max_depth < 0){

391 av_log(s->avctx, AV_LOG_ERROR, "block_max_depth= %d is too large\n", s->block_max_depth);

392 s->block_max_depth= 0;

393 return AVERROR_INVALIDDATA;

394 }

395

396 return 0;

397 }

398

399 static av_cold int decode_init(AVCodecContext *avctx)

400 {

401 int ret;

402

403 if ((ret = ff_snow_common_init(avctx)) < 0) {

404 ff_snow_common_end(avctx->priv_data);

405 return ret;

406 }

407

408 return 0;

409 }

410

411 static int decode_blocks(SnowContext *s){

412 int x, y;

413 int w= s->b_width;

414 int h= s->b_height;

415 int res;

416

417 for(y=0; y<h; y++){

418 for(x=0; x<w; x++){

419 if ((res = decode_q_branch(s, 0, x, y)) < 0)

420 return res;

421 }

422 }

423 return 0;

424 }

425

426 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

427 AVPacket *avpkt)

428 {

429 const uint8_t *buf = avpkt->data;

430 int buf_size = avpkt->size;

431 SnowContext *s = avctx->priv_data;

432 RangeCoder * const c= &s->c;

433 int bytes_read;

434 AVFrame *picture = data;

435 int level, orientation, plane_index;

436 int res;

437

438 ff_init_range_decoder(c, buf, buf_size);

439 ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

440

441 s->current_picture->pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P

442 if ((res = decode_header(s)) < 0)

443 return res;

444 if ((res=ff_snow_common_init_after_header(avctx)) < 0)

445 return res;

446

447 // realloc slice buffer for the case that spatial_decomposition_count changed

448 ff_slice_buffer_destroy(&s->sb);

449 if ((res = ff_slice_buffer_init(&s->sb, s->plane[0].height,

450 (MB_SIZE >> s->block_max_depth) +

451 s->spatial_decomposition_count * 11 + 1,

452 s->plane[0].width,

453 s->spatial_idwt_buffer)) < 0)

454 return res;

455

456 for(plane_index=0; plane_index < s->nb_planes; plane_index++){

457 Plane *p= &s->plane[plane_index];

458 p->fast_mc= p->diag_mc && p->htaps==6 && p->hcoeff[0]==40

459 && p->hcoeff[1]==-10

460 && p->hcoeff[2]==2;

461 }

462

463 ff_snow_alloc_blocks(s);

464

465 if((res = ff_snow_frame_start(s)) < 0)

466 return res;

467

468 s->current_picture->pict_type = s->keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;

469

470 //keyframe flag duplication mess FIXME

471 if(avctx->debug&FF_DEBUG_PICT_INFO)

472 av_log(avctx, AV_LOG_ERROR,

473 "keyframe:%d qlog:%d qbias: %d mvscale: %d "

474 "decomposition_type:%d decomposition_count:%d\n",

475 s->keyframe, s->qlog, s->qbias, s->mv_scale,

476 s->spatial_decomposition_type,

477 s->spatial_decomposition_count

478 );

479

480 av_assert0(!s->avmv);

481 if (s->avctx->flags2 & CODEC_FLAG2_EXPORT_MVS) {

482 s->avmv = av_malloc_array(s->b_width * s->b_height, sizeof(AVMotionVector) << (s->block_max_depth*2));

483 }

484 s->avmv_index = 0;

485

486 if ((res = decode_blocks(s)) < 0)

487 return res;

488

489 for(plane_index=0; plane_index < s->nb_planes; plane_index++){

490 Plane *p= &s->plane[plane_index];

491 int w= p->width;

492 int h= p->height;

493 int x, y;

494 int decode_state[MAX_DECOMPOSITIONS][4][1]; /* Stored state info for unpack_coeffs. 1 variable per instance. */

495

496 if(s->avctx->debug&2048){

497 memset(s->spatial_dwt_buffer, 0, sizeof(DWTELEM)*w*h);

498 predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);

499

500 for(y=0; y<h; y++){

501 for(x=0; x<w; x++){

502 int v= s->current_picture->data[plane_index][y*s->current_picture->linesize[plane_index] + x];

503 s->mconly_picture->data[plane_index][y*s->mconly_picture->linesize[plane_index] + x]= v;

504 }

505 }

506 }

507

508 {

509 for(level=0; level<s->spatial_decomposition_count; level++){

510 for(orientation=level ? 1 : 0; orientation<4; orientation++){

511 SubBand *b= &p->band[level][orientation];

512 unpack_coeffs(s, b, b->parent, orientation);

513 }

514 }

515 }

516

517 {

518 const int mb_h= s->b_height << s->block_max_depth;

519 const int block_size = MB_SIZE >> s->block_max_depth;

520 const int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size;

521 int mb_y;

522 DWTCompose cs[MAX_DECOMPOSITIONS];

523 int yd=0, yq=0;

524 int y;

525 int end_y;

526

527 ff_spatial_idwt_buffered_init(cs, &s->sb, w, h, 1, s->spatial_decomposition_type, s->spatial_decomposition_count);

528 for(mb_y=0; mb_y<=mb_h; mb_y++){

529

530 int slice_starty = block_h*mb_y;

531 int slice_h = block_h*(mb_y+1);

532

533 if (!(s->keyframe || s->avctx->debug&512)){

534 slice_starty = FFMAX(0, slice_starty - (block_h >> 1));

535 slice_h -= (block_h >> 1);

536 }

537

538 for(level=0; level<s->spatial_decomposition_count; level++){

539 for(orientation=level ? 1 : 0; orientation<4; orientation++){

540 SubBand *b= &p->band[level][orientation];

541 int start_y;

542 int end_y;

543 int our_mb_start = mb_y;

544 int our_mb_end = (mb_y + 1);

545 const int extra= 3;

546 start_y = (mb_y ? ((block_h * our_mb_start) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra: 0);

547 end_y = (((block_h * our_mb_end) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra);

548 if (!(s->keyframe || s->avctx->debug&512)){

549 start_y = FFMAX(0, start_y - (block_h >> (1+s->spatial_decomposition_count - level)));

550 end_y = FFMAX(0, end_y - (block_h >> (1+s->spatial_decomposition_count - level)));

551 }

552 start_y = FFMIN(b->height, start_y);

553 end_y = FFMIN(b->height, end_y);

554

555 if (start_y != end_y){

556 if (orientation == 0){

557 SubBand * correlate_band = &p->band[0][0];

558 int correlate_end_y = FFMIN(b->height, end_y + 1);

559 int correlate_start_y = FFMIN(b->height, (start_y ? start_y + 1 : 0));

560 decode_subband_slice_buffered(s, correlate_band, &s->sb, correlate_start_y, correlate_end_y, decode_state[0][0]);

561 correlate_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, 1, 0, correlate_start_y, correlate_end_y);

562 dequantize_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, start_y, end_y);

563 }

564 else

565 decode_subband_slice_buffered(s, b, &s->sb, start_y, end_y, decode_state[level][orientation]);

566 }

567 }

568 }

569

570 for(; yd<slice_h; yd+=4){

571 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);

572 }

573

574 if(s->qlog == LOSSLESS_QLOG){

575 for(; yq<slice_h && yq<h; yq++){

576 IDWTELEM * line = slice_buffer_get_line(&s->sb, yq);

577 for(x=0; x<w; x++){

578 line[x] <<= FRAC_BITS;

579 }

580 }

581 }

582

583 predict_slice_buffered(s, &s->sb, s->spatial_idwt_buffer, plane_index, 1, mb_y);

584

585 y = FFMIN(p->height, slice_starty);

586 end_y = FFMIN(p->height, slice_h);

587 while(y < end_y)

588 ff_slice_buffer_release(&s->sb, y++);

589 }

590

591 ff_slice_buffer_flush(&s->sb);

592 }

593

594 }

595

596 emms_c();

597

598 ff_snow_release_buffer(avctx);

599

600 if(!(s->avctx->debug&2048))

601 res = av_frame_ref(picture, s->current_picture);

602 else

603 res = av_frame_ref(picture, s->mconly_picture);

604 if (res >= 0 && s->avmv_index) {

605 AVFrameSideData *sd;

606

607 sd = av_frame_new_side_data(picture, AV_FRAME_DATA_MOTION_VECTORS, s->avmv_index * sizeof(AVMotionVector));

608 if (!sd)

609 return AVERROR(ENOMEM);

610 memcpy(sd->data, s->avmv, s->avmv_index * sizeof(AVMotionVector));

611 }

612

613 av_freep(&s->avmv);

614

615 if (res < 0)

616 return res;

617

618 *got_frame = 1;

619

620 bytes_read= c->bytestream - c->bytestream_start;

621 if(bytes_read ==0) av_log(s->avctx, AV_LOG_ERROR, "error at end of frame\n"); //FIXME

622

623 return bytes_read;

624 }

625

626 static av_cold int decode_end(AVCodecContext *avctx)

627 {

628 SnowContext *s = avctx->priv_data;

629

630 ff_slice_buffer_destroy(&s->sb);

631

632 ff_snow_common_end(s);

633

634 return 0;

635 }

636

637 AVCodec ff_snow_decoder = {

638 .name = "snow",

639 .long_name = NULL_IF_CONFIG_SMALL("Snow"),

640 .type = AVMEDIA_TYPE_VIDEO,

641 .id = AV_CODEC_ID_SNOW,

642 .priv_data_size = sizeof(SnowContext),

643 .init = decode_init,

644 .close = decode_end,

645 .decode = decode_frame,

646 .capabilities = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,

647 };

Generated on Sun Mar 8 2015 02:35:00 for FFmpeg by doxygen 1.8.2