FFmpeg: libavcodec/vp56.c Source File

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libavcodec

vp56.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 /**

22 * @file

23 * VP5 and VP6 compatible video decoder (common features)

24 */

26 #include "avcodec.h"

27 #include "bytestream.h"

28 #include "internal.h"

30 #include "vp56.h"

31 #include "vp56data.h"

34 void ff_vp56_init_dequant(VP56Context *s, int quantizer)

35 {

36 s->quantizer = quantizer;

37 s->dequant_dc = vp56_dc_dequant[quantizer] << 2;

38 s->dequant_ac = vp56_ac_dequant[quantizer] << 2;

39 memset(s->qscale_table, quantizer, s->mb_width);

40 }

42 static int vp56_get_vectors_predictors(VP56Context *s, int row, int col,

43 VP56Frame ref_frame)

44 {

45 int nb_pred = 0;

46 VP56mv vect[2] = {{0,0}, {0,0}};

47 int pos, offset;

48 VP56mv mvp;

50 for (pos=0; pos<12; pos++) {

51 mvp.x = col + vp56_candidate_predictor_pos[pos][0];

52 mvp.y = row + vp56_candidate_predictor_pos[pos][1];

53 if (mvp.x < 0 || mvp.x >= s->mb_width ||

54 mvp.y < 0 || mvp.y >= s->mb_height)

55 continue;

56 offset = mvp.x + s->mb_width*mvp.y;

58 if (vp56_reference_frame[s->macroblocks[offset].type] != ref_frame)

59 continue;

60 if ((s->macroblocks[offset].mv.x == vect[0].x &&

61 s->macroblocks[offset].mv.y == vect[0].y) ||

62 (s->macroblocks[offset].mv.x == 0 &&

63 s->macroblocks[offset].mv.y == 0))

64 continue;

66 vect[nb_pred++] = s->macroblocks[offset].mv;

67 if (nb_pred > 1) {

68 nb_pred = -1;

69 break;

70 }

71 s->vector_candidate_pos = pos;

72 }

74 s->vector_candidate[0] = vect[0];

75 s->vector_candidate[1] = vect[1];

77 return nb_pred+1;

78 }

80 static void vp56_parse_mb_type_models(VP56Context *s)

81 {

82 VP56RangeCoder *c = &s->c;

83 VP56Model *model = s->modelp;

84 int i, ctx, type;

86 for (ctx=0; ctx<3; ctx++) {

87 if (vp56_rac_get_prob(c, 174)) {

88 int idx = vp56_rac_gets(c, 4);

89 memcpy(model->mb_types_stats[ctx],

90 vp56_pre_def_mb_type_stats[idx][ctx],

91 sizeof(model->mb_types_stats[ctx]));

92 }

93 if (vp56_rac_get_prob(c, 254)) {

94 for (type=0; type<10; type++) {

95 for(i=0; i<2; i++) {

96 if (vp56_rac_get_prob(c, 205)) {

97 int delta, sign = vp56_rac_get(c);

99 delta = vp56_rac_get_tree(c, vp56_pmbtm_tree,

100 vp56_mb_type_model_model);

101 if (!delta)

102 delta = 4 * vp56_rac_gets(c, 7);

103 model->mb_types_stats[ctx][type][i] += (delta ^ -sign) + sign;

104 }

105 }

106 }

107 }

108 }

109

110 /* compute MB type probability tables based on previous MB type */

111 for (ctx=0; ctx<3; ctx++) {

112 int p[10];

113

114 for (type=0; type<10; type++)

115 p[type] = 100 * model->mb_types_stats[ctx][type][1];

116

117 for (type=0; type<10; type++) {

118 int p02, p34, p0234, p17, p56, p89, p5689, p156789;

119

120 /* conservative MB type probability */

121 model->mb_type[ctx][type][0] = 255 - (255 * model->mb_types_stats[ctx][type][0]) / (1 + model->mb_types_stats[ctx][type][0] + model->mb_types_stats[ctx][type][1]);

122

123 p[type] = 0; /* same MB type => weight is null */

124

125 /* binary tree parsing probabilities */

126 p02 = p[0] + p[2];

127 p34 = p[3] + p[4];

128 p0234 = p02 + p34;

129 p17 = p[1] + p[7];

130 p56 = p[5] + p[6];

131 p89 = p[8] + p[9];

132 p5689 = p56 + p89;

133 p156789 = p17 + p5689;

134

135 model->mb_type[ctx][type][1] = 1 + 255 * p0234/(1+p0234+p156789);

136 model->mb_type[ctx][type][2] = 1 + 255 * p02 / (1+p0234);

137 model->mb_type[ctx][type][3] = 1 + 255 * p17 / (1+p156789);

138 model->mb_type[ctx][type][4] = 1 + 255 * p[0] / (1+p02);

139 model->mb_type[ctx][type][5] = 1 + 255 * p[3] / (1+p34);

140 model->mb_type[ctx][type][6] = 1 + 255 * p[1] / (1+p17);

141 model->mb_type[ctx][type][7] = 1 + 255 * p56 / (1+p5689);

142 model->mb_type[ctx][type][8] = 1 + 255 * p[5] / (1+p56);

143 model->mb_type[ctx][type][9] = 1 + 255 * p[8] / (1+p89);

144

145 /* restore initial value */

146 p[type] = 100 * model->mb_types_stats[ctx][type][1];

147 }

148 }

149 }

150

151 static VP56mb vp56_parse_mb_type(VP56Context *s,

152 VP56mb prev_type, int ctx)

153 {

154 uint8_t *mb_type_model = s->modelp->mb_type[ctx][prev_type];

155 VP56RangeCoder *c = &s->c;

156

157 if (vp56_rac_get_prob(c, mb_type_model[0]))

158 return prev_type;

159 else

160 return vp56_rac_get_tree(c, vp56_pmbt_tree, mb_type_model);

161 }

162

163 static void vp56_decode_4mv(VP56Context *s, int row, int col)

164 {

165 VP56mv mv = {0,0};

166 int type[4];

167 int b;

168

169 /* parse each block type */

170 for (b=0; b<4; b++) {

171 type[b] = vp56_rac_gets(&s->c, 2);

172 if (type[b])

173 type[b]++; /* only returns 0, 2, 3 or 4 (all INTER_PF) */

174 }

175

176 /* get vectors */

177 for (b=0; b<4; b++) {

178 switch (type[b]) {

179 case VP56_MB_INTER_NOVEC_PF:

180 s->mv[b] = (VP56mv) {0,0};

181 break;

182 case VP56_MB_INTER_DELTA_PF:

183 s->parse_vector_adjustment(s, &s->mv[b]);

184 break;

185 case VP56_MB_INTER_V1_PF:

186 s->mv[b] = s->vector_candidate[0];

187 break;

188 case VP56_MB_INTER_V2_PF:

189 s->mv[b] = s->vector_candidate[1];

190 break;

191 }

192 mv.x += s->mv[b].x;

193 mv.y += s->mv[b].y;

194 }

195

196 /* this is the one selected for the whole MB for prediction */

197 s->macroblocks[row * s->mb_width + col].mv = s->mv[3];

198

199 /* chroma vectors are average luma vectors */

200 if (s->avctx->codec->id == AV_CODEC_ID_VP5) {

201 s->mv[4].x = s->mv[5].x = RSHIFT(mv.x,2);

202 s->mv[4].y = s->mv[5].y = RSHIFT(mv.y,2);

203 } else {

204 s->mv[4] = s->mv[5] = (VP56mv) {mv.x/4, mv.y/4};

205 }

206 }

207

208 static VP56mb vp56_decode_mv(VP56Context *s, int row, int col)

209 {

210 VP56mv *mv, vect = {0,0};

211 int ctx, b;

212

213 ctx = vp56_get_vectors_predictors(s, row, col, VP56_FRAME_PREVIOUS);

214 s->mb_type = vp56_parse_mb_type(s, s->mb_type, ctx);

215 s->macroblocks[row * s->mb_width + col].type = s->mb_type;

216

217 switch (s->mb_type) {

218 case VP56_MB_INTER_V1_PF:

219 mv = &s->vector_candidate[0];

220 break;

221

222 case VP56_MB_INTER_V2_PF:

223 mv = &s->vector_candidate[1];

224 break;

225

226 case VP56_MB_INTER_V1_GF:

227 vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);

228 mv = &s->vector_candidate[0];

229 break;

230

231 case VP56_MB_INTER_V2_GF:

232 vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);

233 mv = &s->vector_candidate[1];

234 break;

235

236 case VP56_MB_INTER_DELTA_PF:

237 s->parse_vector_adjustment(s, &vect);

238 mv = &vect;

239 break;

240

241 case VP56_MB_INTER_DELTA_GF:

242 vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);

243 s->parse_vector_adjustment(s, &vect);

244 mv = &vect;

245 break;

246

247 case VP56_MB_INTER_4V:

248 vp56_decode_4mv(s, row, col);

249 return s->mb_type;

250

251 default:

252 mv = &vect;

253 break;

254 }

255

256 s->macroblocks[row*s->mb_width + col].mv = *mv;

257

258 /* same vector for all blocks */

259 for (b=0; b<6; b++)

260 s->mv[b] = *mv;

261

262 return s->mb_type;

263 }

264

265 static void vp56_add_predictors_dc(VP56Context *s, VP56Frame ref_frame)

266 {

267 int idx = s->scantable.permutated[0];

268 int b;

269

270 for (b=0; b<6; b++) {

271 VP56RefDc *ab = &s->above_blocks[s->above_block_idx[b]];

272 VP56RefDc *lb = &s->left_block[ff_vp56_b6to4[b]];

273 int count = 0;

274 int dc = 0;

275 int i;

276

277 if (ref_frame == lb->ref_frame) {

278 dc += lb->dc_coeff;

279 count++;

280 }

281 if (ref_frame == ab->ref_frame) {

282 dc += ab->dc_coeff;

283 count++;

284 }

285 if (s->avctx->codec->id == AV_CODEC_ID_VP5)

286 for (i=0; i<2; i++)

287 if (count < 2 && ref_frame == ab[-1+2*i].ref_frame) {

288 dc += ab[-1+2*i].dc_coeff;

289 count++;

290 }

291 if (count == 0)

292 dc = s->prev_dc[ff_vp56_b2p[b]][ref_frame];

293 else if (count == 2)

294 dc /= 2;

295

296 s->block_coeff[b][idx] += dc;

297 s->prev_dc[ff_vp56_b2p[b]][ref_frame] = s->block_coeff[b][idx];

298 ab->dc_coeff = s->block_coeff[b][idx];

299 ab->ref_frame = ref_frame;

300 lb->dc_coeff = s->block_coeff[b][idx];

301 lb->ref_frame = ref_frame;

302 s->block_coeff[b][idx] *= s->dequant_dc;

303 }

304 }

305

306 static void vp56_deblock_filter(VP56Context *s, uint8_t *yuv,

307 int stride, int dx, int dy)

308 {

309 int t = vp56_filter_threshold[s->quantizer];

310 if (dx) s->vp56dsp.edge_filter_hor(yuv + 10-dx , stride, t);

311 if (dy) s->vp56dsp.edge_filter_ver(yuv + stride*(10-dy), stride, t);

312 }

313

314 static void vp56_mc(VP56Context *s, int b, int plane, uint8_t *src,

315 int stride, int x, int y)

316 {

317 uint8_t *dst=s->framep[VP56_FRAME_CURRENT]->data[plane]+s->block_offset[b];

318 uint8_t *src_block;

319 int src_offset;

320 int overlap_offset = 0;

321 int mask = s->vp56_coord_div[b] - 1;

322 int deblock_filtering = s->deblock_filtering;

323 int dx;

324 int dy;

325

326 if (s->avctx->skip_loop_filter >= AVDISCARD_ALL ||

327 (s->avctx->skip_loop_filter >= AVDISCARD_NONKEY

328 && !s->framep[VP56_FRAME_CURRENT]->key_frame))

329 deblock_filtering = 0;

330

331 dx = s->mv[b].x / s->vp56_coord_div[b];

332 dy = s->mv[b].y / s->vp56_coord_div[b];

333

334 if (b >= 4) {

335 x /= 2;

336 y /= 2;

337 }

338 x += dx - 2;

339 y += dy - 2;

340

341 if (x<0 || x+12>=s->plane_width[plane] ||

342 y<0 || y+12>=s->plane_height[plane]) {

343 s->vdsp.emulated_edge_mc(s->edge_emu_buffer,

344 src + s->block_offset[b] + (dy-2)*stride + (dx-2),

345 stride, 12, 12, x, y,

346 s->plane_width[plane],

347 s->plane_height[plane]);

348 src_block = s->edge_emu_buffer;

349 src_offset = 2 + 2*stride;

350 } else if (deblock_filtering) {

351 /* only need a 12x12 block, but there is no such dsp function, */

352 /* so copy a 16x12 block */

353 s->dsp.put_pixels_tab[0][0](s->edge_emu_buffer,

354 src + s->block_offset[b] + (dy-2)*stride + (dx-2),

355 stride, 12);

356 src_block = s->edge_emu_buffer;

357 src_offset = 2 + 2*stride;

358 } else {

359 src_block = src;

360 src_offset = s->block_offset[b] + dy*stride + dx;

361 }

362

363 if (deblock_filtering)

364 vp56_deblock_filter(s, src_block, stride, dx&7, dy&7);

365

366 if (s->mv[b].x & mask)

367 overlap_offset += (s->mv[b].x > 0) ? 1 : -1;

368 if (s->mv[b].y & mask)

369 overlap_offset += (s->mv[b].y > 0) ? stride : -stride;

370

371 if (overlap_offset) {

372 if (s->filter)

373 s->filter(s, dst, src_block, src_offset, src_offset+overlap_offset,

374 stride, s->mv[b], mask, s->filter_selection, b<4);

375 else

376 s->dsp.put_no_rnd_pixels_l2[1](dst, src_block+src_offset,

377 src_block+src_offset+overlap_offset,

378 stride, 8);

379 } else {

380 s->dsp.put_pixels_tab[1][0](dst, src_block+src_offset, stride, 8);

381 }

382 }

383

384 static void vp56_decode_mb(VP56Context *s, int row, int col, int is_alpha)

385 {

386 AVFrame *frame_current, *frame_ref;

387 VP56mb mb_type;

388 VP56Frame ref_frame;

389 int b, ab, b_max, plane, off;

390

391 if (s->framep[VP56_FRAME_CURRENT]->key_frame)

392 mb_type = VP56_MB_INTRA;

393 else

394 mb_type = vp56_decode_mv(s, row, col);

395 ref_frame = vp56_reference_frame[mb_type];

396

397 s->dsp.clear_blocks(*s->block_coeff);

398

399 s->parse_coeff(s);

400

401 vp56_add_predictors_dc(s, ref_frame);

402

403 frame_current = s->framep[VP56_FRAME_CURRENT];

404 frame_ref = s->framep[ref_frame];

405 if (mb_type != VP56_MB_INTRA && !frame_ref->data[0])

406 return;

407

408 ab = 6*is_alpha;

409 b_max = 6 - 2*is_alpha;

410

411 switch (mb_type) {

412 case VP56_MB_INTRA:

413 for (b=0; b<b_max; b++) {

414 plane = ff_vp56_b2p[b+ab];

415 s->vp3dsp.idct_put(frame_current->data[plane] + s->block_offset[b],

416 s->stride[plane], s->block_coeff[b]);

417 }

418 break;

419

420 case VP56_MB_INTER_NOVEC_PF:

421 case VP56_MB_INTER_NOVEC_GF:

422 for (b=0; b<b_max; b++) {

423 plane = ff_vp56_b2p[b+ab];

424 off = s->block_offset[b];

425 s->dsp.put_pixels_tab[1][0](frame_current->data[plane] + off,

426 frame_ref->data[plane] + off,

427 s->stride[plane], 8);

428 s->vp3dsp.idct_add(frame_current->data[plane] + off,

429 s->stride[plane], s->block_coeff[b]);

430 }

431 break;

432

433 case VP56_MB_INTER_DELTA_PF:

434 case VP56_MB_INTER_V1_PF:

435 case VP56_MB_INTER_V2_PF:

436 case VP56_MB_INTER_DELTA_GF:

437 case VP56_MB_INTER_4V:

438 case VP56_MB_INTER_V1_GF:

439 case VP56_MB_INTER_V2_GF:

440 for (b=0; b<b_max; b++) {

441 int x_off = b==1 || b==3 ? 8 : 0;

442 int y_off = b==2 || b==3 ? 8 : 0;

443 plane = ff_vp56_b2p[b+ab];

444 vp56_mc(s, b, plane, frame_ref->data[plane], s->stride[plane],

445 16*col+x_off, 16*row+y_off);

446 s->vp3dsp.idct_add(frame_current->data[plane] + s->block_offset[b],

447 s->stride[plane], s->block_coeff[b]);

448 }

449 break;

450 }

451 }

452

453 static int vp56_size_changed(VP56Context *s)

454 {

455 AVCodecContext *avctx = s->avctx;

456 int stride = s->framep[VP56_FRAME_CURRENT]->linesize[0];

457 int i;

458

459 s->plane_width[0] = s->plane_width[3] = avctx->coded_width;

460 s->plane_width[1] = s->plane_width[2] = avctx->coded_width/2;

461 s->plane_height[0] = s->plane_height[3] = avctx->coded_height;

462 s->plane_height[1] = s->plane_height[2] = avctx->coded_height/2;

463

464 for (i=0; i<4; i++)

465 s->stride[i] = s->flip * s->framep[VP56_FRAME_CURRENT]->linesize[i];

466

467 s->mb_width = (avctx->coded_width +15) / 16;

468 s->mb_height = (avctx->coded_height+15) / 16;

469

470 if (s->mb_width > 1000 || s->mb_height > 1000) {

471 avcodec_set_dimensions(avctx, 0, 0);

472 av_log(avctx, AV_LOG_ERROR, "picture too big\n");

473 return -1;

474 }

475

476 s->qscale_table = av_realloc(s->qscale_table, s->mb_width);

477 s->above_blocks = av_realloc(s->above_blocks,

478 (4*s->mb_width+6) * sizeof(*s->above_blocks));

479 s->macroblocks = av_realloc(s->macroblocks,

480 s->mb_width*s->mb_height*sizeof(*s->macroblocks));

481 av_free(s->edge_emu_buffer_alloc);

482 s->edge_emu_buffer_alloc = av_malloc(16*stride);

483 s->edge_emu_buffer = s->edge_emu_buffer_alloc;

484 if (s->flip < 0)

485 s->edge_emu_buffer += 15 * stride;

486

487 if (s->alpha_context)

488 return vp56_size_changed(s->alpha_context);

489

490 return 0;

491 }

492

493 static int ff_vp56_decode_mbs(AVCodecContext *avctx, void *, int, int);

494

495 int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

496 AVPacket *avpkt)

497 {

498 const uint8_t *buf = avpkt->data;

499 VP56Context *s = avctx->priv_data;

500 AVFrame *p = 0;

501 int remaining_buf_size = avpkt->size;

502 int av_uninit(alpha_offset);

503 int i, res;

504

505 /* select a current frame from the unused frames */

506 for (i = 0; i < 4; ++i) {

507 if (!s->frames[i].data[0]) {

508 p = &s->frames[i];

509 break;

510 }

511 }

512 av_assert0(p != 0);

513 s->framep[VP56_FRAME_CURRENT] = p;

514 if (s->alpha_context)

515 s->alpha_context->framep[VP56_FRAME_CURRENT] = p;

516

517 if (s->has_alpha) {

518 if (remaining_buf_size < 3)

519 return -1;

520 alpha_offset = bytestream_get_be24(&buf);

521 remaining_buf_size -= 3;

522 if (remaining_buf_size < alpha_offset)

523 return -1;

524 }

525

526 res = s->parse_header(s, buf, remaining_buf_size);

527 if (res < 0)

528 return res;

529

530 if (res == VP56_SIZE_CHANGE) {

531 for (i = 0; i < 4; i++) {

532 if (s->frames[i].data[0])

533 avctx->release_buffer(avctx, &s->frames[i]);

534 }

535 }

536

537 p->reference = 3;

538 if (ff_get_buffer(avctx, p) < 0) {

539 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

540 return -1;

541 }

542

543 if (res == VP56_SIZE_CHANGE) {

544 if (vp56_size_changed(s)) {

545 avctx->release_buffer(avctx, p);

546 return -1;

547 }

548 }

549

550 if (s->has_alpha) {

551 int bak_w = avctx->width;

552 int bak_h = avctx->height;

553 int bak_cw = avctx->coded_width;

554 int bak_ch = avctx->coded_height;

555 buf += alpha_offset;

556 remaining_buf_size -= alpha_offset;

557

558 res = s->alpha_context->parse_header(s->alpha_context, buf, remaining_buf_size);

559 if (res != 0) {

560 if(res==VP56_SIZE_CHANGE) {

561 av_log(avctx, AV_LOG_ERROR, "Alpha reconfiguration\n");

562 avctx->width = bak_w;

563 avctx->height = bak_h;

564 avctx->coded_width = bak_cw;

565 avctx->coded_height = bak_ch;

566 }

567 avctx->release_buffer(avctx, p);

568 return -1;

569 }

570 }

571

572 avctx->execute2(avctx, ff_vp56_decode_mbs, 0, 0, s->has_alpha + 1);

573

574 /* release frames that aren't in use */

575 for (i = 0; i < 4; ++i) {

576 AVFrame *victim = &s->frames[i];

577 if (!victim->data[0])

578 continue;

579 if (victim != s->framep[VP56_FRAME_PREVIOUS] &&

580 victim != s->framep[VP56_FRAME_GOLDEN] &&

581 (!s->has_alpha || victim != s->alpha_context->framep[VP56_FRAME_GOLDEN]))

582 avctx->release_buffer(avctx, victim);

583 }

584

585 p->qstride = 0;

586 p->qscale_table = s->qscale_table;

587 p->qscale_type = FF_QSCALE_TYPE_VP56;

588 *(AVFrame*)data = *p;

589 *got_frame = 1;

590

591 return avpkt->size;

592 }

593

594 static int ff_vp56_decode_mbs(AVCodecContext *avctx, void *data,

595 int jobnr, int threadnr)

596 {

597 VP56Context *s0 = avctx->priv_data;

598 int is_alpha = (jobnr == 1);

599 VP56Context *s = is_alpha ? s0->alpha_context : s0;

600 AVFrame *const p = s->framep[VP56_FRAME_CURRENT];

601 int mb_row, mb_col, mb_row_flip, mb_offset = 0;

602 int block, y, uv, stride_y, stride_uv;

603

604 if (p->key_frame) {

605 p->pict_type = AV_PICTURE_TYPE_I;

606 s->default_models_init(s);

607 for (block=0; block<s->mb_height*s->mb_width; block++)

608 s->macroblocks[block].type = VP56_MB_INTRA;

609 } else {

610 p->pict_type = AV_PICTURE_TYPE_P;

611 vp56_parse_mb_type_models(s);

612 s->parse_vector_models(s);

613 s->mb_type = VP56_MB_INTER_NOVEC_PF;

614 }

615

616 if (s->parse_coeff_models(s))

617 goto next;

618

619 memset(s->prev_dc, 0, sizeof(s->prev_dc));

620 s->prev_dc[1][VP56_FRAME_CURRENT] = 128;

621 s->prev_dc[2][VP56_FRAME_CURRENT] = 128;

622

623 for (block=0; block < 4*s->mb_width+6; block++) {

624 s->above_blocks[block].ref_frame = VP56_FRAME_NONE;

625 s->above_blocks[block].dc_coeff = 0;

626 s->above_blocks[block].not_null_dc = 0;

627 }

628 s->above_blocks[2*s->mb_width + 2].ref_frame = VP56_FRAME_CURRENT;

629 s->above_blocks[3*s->mb_width + 4].ref_frame = VP56_FRAME_CURRENT;

630

631 stride_y = p->linesize[0];

632 stride_uv = p->linesize[1];

633

634 if (s->flip < 0)

635 mb_offset = 7;

636

637 /* main macroblocks loop */

638 for (mb_row=0; mb_row<s->mb_height; mb_row++) {

639 if (s->flip < 0)

640 mb_row_flip = s->mb_height - mb_row - 1;

641 else

642 mb_row_flip = mb_row;

643

644 for (block=0; block<4; block++) {

645 s->left_block[block].ref_frame = VP56_FRAME_NONE;

646 s->left_block[block].dc_coeff = 0;

647 s->left_block[block].not_null_dc = 0;

648 }

649 memset(s->coeff_ctx, 0, sizeof(s->coeff_ctx));

650 memset(s->coeff_ctx_last, 24, sizeof(s->coeff_ctx_last));

651

652 s->above_block_idx[0] = 1;

653 s->above_block_idx[1] = 2;

654 s->above_block_idx[2] = 1;

655 s->above_block_idx[3] = 2;

656 s->above_block_idx[4] = 2*s->mb_width + 2 + 1;

657 s->above_block_idx[5] = 3*s->mb_width + 4 + 1;

658

659 s->block_offset[s->frbi] = (mb_row_flip*16 + mb_offset) * stride_y;

660 s->block_offset[s->srbi] = s->block_offset[s->frbi] + 8*stride_y;

661 s->block_offset[1] = s->block_offset[0] + 8;

662 s->block_offset[3] = s->block_offset[2] + 8;

663 s->block_offset[4] = (mb_row_flip*8 + mb_offset) * stride_uv;

664 s->block_offset[5] = s->block_offset[4];

665

666 for (mb_col=0; mb_col<s->mb_width; mb_col++) {

667 vp56_decode_mb(s, mb_row, mb_col, is_alpha);

668

669 for (y=0; y<4; y++) {

670 s->above_block_idx[y] += 2;

671 s->block_offset[y] += 16;

672 }

673

674 for (uv=4; uv<6; uv++) {

675 s->above_block_idx[uv] += 1;

676 s->block_offset[uv] += 8;

677 }

678 }

679 }

680

681 next:

682 if (p->key_frame || s->golden_frame) {

683 s->framep[VP56_FRAME_GOLDEN] = p;

684 }

685

686 FFSWAP(AVFrame *, s->framep[VP56_FRAME_CURRENT],

687 s->framep[VP56_FRAME_PREVIOUS]);

688 return 0;

689 }

690

691 av_cold void ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha)

692 {

693 VP56Context *s = avctx->priv_data;

694 ff_vp56_init_context(avctx, s, flip, has_alpha);

695 }

696

697 av_cold void ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,

698 int flip, int has_alpha)

699 {

700 int i;

701

702 s->avctx = avctx;

703 avctx->pix_fmt = has_alpha ? AV_PIX_FMT_YUVA420P : AV_PIX_FMT_YUV420P;

704

705 ff_dsputil_init(&s->dsp, avctx);

706 ff_videodsp_init(&s->vdsp, 8);

707 ff_vp3dsp_init(&s->vp3dsp, avctx->flags);

708 ff_vp56dsp_init(&s->vp56dsp, avctx->codec->id);

709 ff_init_scantable_permutation(s->dsp.idct_permutation, s->vp3dsp.idct_perm);

710 ff_init_scantable(s->dsp.idct_permutation, &s->scantable,ff_zigzag_direct);

711

712 for (i=0; i<4; i++) {

713 s->framep[i] = &s->frames[i];

714 avcodec_get_frame_defaults(&s->frames[i]);

715 }

716 s->framep[VP56_FRAME_UNUSED] = s->framep[VP56_FRAME_GOLDEN];

717 s->framep[VP56_FRAME_UNUSED2] = s->framep[VP56_FRAME_GOLDEN2];

718 s->edge_emu_buffer_alloc = NULL;

719

720 s->above_blocks = NULL;

721 s->macroblocks = NULL;

722 s->quantizer = -1;

723 s->deblock_filtering = 1;

724 s->golden_frame = 0;

725

726 s->filter = NULL;

727

728 s->has_alpha = has_alpha;

729

730 s->modelp = &s->model;

731

732 if (flip) {

733 s->flip = -1;

734 s->frbi = 2;

735 s->srbi = 0;

736 } else {

737 s->flip = 1;

738 s->frbi = 0;

739 s->srbi = 2;

740 }

741 }

742

743 av_cold int ff_vp56_free(AVCodecContext *avctx)

744 {

745 VP56Context *s = avctx->priv_data;

746 return ff_vp56_free_context(s);

747 }

748

749 av_cold int ff_vp56_free_context(VP56Context *s)

750 {

751 AVCodecContext *avctx = s->avctx;

752 int i;

753

754 av_freep(&s->qscale_table);

755 av_freep(&s->above_blocks);

756 av_freep(&s->macroblocks);

757 av_freep(&s->edge_emu_buffer_alloc);

758 for (i = 0; i < 4; ++i) {

759 if (s->frames[i].data[0])

760 avctx->release_buffer(avctx, &s->frames[i]);

761 }

762 return 0;

763 }

Generated on Sat May 25 2013 03:58:42 for FFmpeg by doxygen 1.8.2