FFmpeg: libavcodec/svq1dec.c Source File

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libavcodec

svq1dec.c

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1 /*

2 * SVQ1 decoder

3 * ported to MPlayer by Arpi <arpi@thot.banki.hu>

4 * ported to libavcodec by Nick Kurshev <nickols_k@mail.ru>

5 *

8 *

10 *

11 * This file is part of FFmpeg.

12 *

13 * FFmpeg is free software; you can redistribute it and/or

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 *

18 * FFmpeg is distributed in the hope that it will be useful,

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

24 * License along with FFmpeg; if not, write to the Free Software

25 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

26 */

28 /**

29 * @file

30 * Sorenson Vector Quantizer #1 (SVQ1) video codec.

31 * For more information of the SVQ1 algorithm, visit:

32 * http://www.pcisys.net/~melanson/codecs/

33 */

35 #include "avcodec.h"

36 #include "get_bits.h"

37 #include "h263.h"

38 #include "hpeldsp.h"

39 #include "internal.h"

40 #include "mathops.h"

41 #include "svq1.h"

43 static VLC svq1_block_type;

44 static VLC svq1_motion_component;

45 static VLC svq1_intra_multistage[6];

46 static VLC svq1_inter_multistage[6];

47 static VLC svq1_intra_mean;

48 static VLC svq1_inter_mean;

50 /* motion vector (prediction) */

51 typedef struct svq1_pmv_s {

52 int x;

53 int y;

54 } svq1_pmv;

56 typedef struct SVQ1Context {

57 HpelDSPContext hdsp;

58 GetBitContext gb;

59 AVFrame *prev;

61 uint8_t *pkt_swapped;

62 int pkt_swapped_allocated;

64 int width;

65 int height;

66 int frame_code;

67 int nonref; // 1 if the current frame won't be referenced

68 } SVQ1Context;

70 static const uint8_t string_table[256] = {

71 0x00, 0xD5, 0x7F, 0xAA, 0xFE, 0x2B, 0x81, 0x54,

72 0x29, 0xFC, 0x56, 0x83, 0xD7, 0x02, 0xA8, 0x7D,

73 0x52, 0x87, 0x2D, 0xF8, 0xAC, 0x79, 0xD3, 0x06,

74 0x7B, 0xAE, 0x04, 0xD1, 0x85, 0x50, 0xFA, 0x2F,

75 0xA4, 0x71, 0xDB, 0x0E, 0x5A, 0x8F, 0x25, 0xF0,

76 0x8D, 0x58, 0xF2, 0x27, 0x73, 0xA6, 0x0C, 0xD9,

77 0xF6, 0x23, 0x89, 0x5C, 0x08, 0xDD, 0x77, 0xA2,

78 0xDF, 0x0A, 0xA0, 0x75, 0x21, 0xF4, 0x5E, 0x8B,

79 0x9D, 0x48, 0xE2, 0x37, 0x63, 0xB6, 0x1C, 0xC9,

80 0xB4, 0x61, 0xCB, 0x1E, 0x4A, 0x9F, 0x35, 0xE0,

81 0xCF, 0x1A, 0xB0, 0x65, 0x31, 0xE4, 0x4E, 0x9B,

82 0xE6, 0x33, 0x99, 0x4C, 0x18, 0xCD, 0x67, 0xB2,

83 0x39, 0xEC, 0x46, 0x93, 0xC7, 0x12, 0xB8, 0x6D,

84 0x10, 0xC5, 0x6F, 0xBA, 0xEE, 0x3B, 0x91, 0x44,

85 0x6B, 0xBE, 0x14, 0xC1, 0x95, 0x40, 0xEA, 0x3F,

86 0x42, 0x97, 0x3D, 0xE8, 0xBC, 0x69, 0xC3, 0x16,

87 0xEF, 0x3A, 0x90, 0x45, 0x11, 0xC4, 0x6E, 0xBB,

88 0xC6, 0x13, 0xB9, 0x6C, 0x38, 0xED, 0x47, 0x92,

89 0xBD, 0x68, 0xC2, 0x17, 0x43, 0x96, 0x3C, 0xE9,

90 0x94, 0x41, 0xEB, 0x3E, 0x6A, 0xBF, 0x15, 0xC0,

91 0x4B, 0x9E, 0x34, 0xE1, 0xB5, 0x60, 0xCA, 0x1F,

92 0x62, 0xB7, 0x1D, 0xC8, 0x9C, 0x49, 0xE3, 0x36,

93 0x19, 0xCC, 0x66, 0xB3, 0xE7, 0x32, 0x98, 0x4D,

94 0x30, 0xE5, 0x4F, 0x9A, 0xCE, 0x1B, 0xB1, 0x64,

95 0x72, 0xA7, 0x0D, 0xD8, 0x8C, 0x59, 0xF3, 0x26,

96 0x5B, 0x8E, 0x24, 0xF1, 0xA5, 0x70, 0xDA, 0x0F,

97 0x20, 0xF5, 0x5F, 0x8A, 0xDE, 0x0B, 0xA1, 0x74,

98 0x09, 0xDC, 0x76, 0xA3, 0xF7, 0x22, 0x88, 0x5D,

99 0xD6, 0x03, 0xA9, 0x7C, 0x28, 0xFD, 0x57, 0x82,

100 0xFF, 0x2A, 0x80, 0x55, 0x01, 0xD4, 0x7E, 0xAB,

101 0x84, 0x51, 0xFB, 0x2E, 0x7A, 0xAF, 0x05, 0xD0,

102 0xAD, 0x78, 0xD2, 0x07, 0x53, 0x86, 0x2C, 0xF9

103 };

104

105 #define SVQ1_PROCESS_VECTOR() \

106 for (; level > 0; i++) { \

107 /* process next depth */ \

108 if (i == m) { \

109 m = n; \

110 if (--level == 0) \

111 break; \

112 } \

113 /* divide block if next bit set */ \

114 if (!get_bits1(bitbuf)) \

115 break; \

116 /* add child nodes */ \

117 list[n++] = list[i]; \

118 list[n++] = list[i] + (((level & 1) ? pitch : 1) << ((level >> 1) + 1));\

119 }

120

121 #define SVQ1_ADD_CODEBOOK() \

122 /* add codebook entries to vector */ \

123 for (j = 0; j < stages; j++) { \

124 n3 = codebook[entries[j]] ^ 0x80808080; \

125 n1 += (n3 & 0xFF00FF00) >> 8; \

126 n2 += n3 & 0x00FF00FF; \

127 } \

128 \

129 /* clip to [0..255] */ \

130 if (n1 & 0xFF00FF00) { \

131 n3 = (n1 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \

132 n1 += 0x7F007F00; \

133 n1 |= (~n1 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \

134 n1 &= n3 & 0x00FF00FF; \

135 } \

136 \

137 if (n2 & 0xFF00FF00) { \

138 n3 = (n2 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \

139 n2 += 0x7F007F00; \

140 n2 |= (~n2 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \

141 n2 &= n3 & 0x00FF00FF; \

142 }

143

144 #define SVQ1_CALC_CODEBOOK_ENTRIES(cbook) \

145 codebook = (const uint32_t *)cbook[level]; \

146 if (stages > 0) \

147 bit_cache = get_bits(bitbuf, 4 * stages); \

148 /* calculate codebook entries for this vector */ \

149 for (j = 0; j < stages; j++) { \

150 entries[j] = (((bit_cache >> (4 * (stages - j - 1))) & 0xF) + \

151 16 * j) << (level + 1); \

152 } \

153 mean -= stages * 128; \

154 n4 = (mean << 16) + mean;

155

156 static int svq1_decode_block_intra(GetBitContext *bitbuf, uint8_t *pixels,

157 int pitch)

158 {

159 uint32_t bit_cache;

160 uint8_t *list[63];

161 uint32_t *dst;

162 const uint32_t *codebook;

163 int entries[6];

164 int i, j, m, n;

165 int mean, stages;

166 unsigned x, y, width, height, level;

167 uint32_t n1, n2, n3, n4;

168

169 /* initialize list for breadth first processing of vectors */

170 list[0] = pixels;

171

172 /* recursively process vector */

173 for (i = 0, m = 1, n = 1, level = 5; i < n; i++) {

174 SVQ1_PROCESS_VECTOR();

175

176 /* destination address and vector size */

177 dst = (uint32_t *)list[i];

178 width = 1 << ((4 + level) / 2);

179 height = 1 << ((3 + level) / 2);

180

181 /* get number of stages (-1 skips vector, 0 for mean only) */

182 stages = get_vlc2(bitbuf, svq1_intra_multistage[level].table, 3, 3) - 1;

183

184 if (stages == -1) {

185 for (y = 0; y < height; y++)

186 memset(&dst[y * (pitch / 4)], 0, width);

187 continue; /* skip vector */

188 }

189

190 if ((stages > 0 && level >= 4)) {

191 av_dlog(NULL,

192 "Error (svq1_decode_block_intra): invalid vector: stages=%i level=%i\n",

193 stages, level);

194 return AVERROR_INVALIDDATA; /* invalid vector */

195 }

196 av_assert0(stages >= 0);

197

198 mean = get_vlc2(bitbuf, svq1_intra_mean.table, 8, 3);

199

200 if (stages == 0) {

201 for (y = 0; y < height; y++)

202 memset(&dst[y * (pitch / 4)], mean, width);

203 } else {

204 SVQ1_CALC_CODEBOOK_ENTRIES(ff_svq1_intra_codebooks);

205

206 for (y = 0; y < height; y++) {

207 for (x = 0; x < width / 4; x++, codebook++) {

208 n1 = n4;

209 n2 = n4;

210 SVQ1_ADD_CODEBOOK()

211 /* store result */

212 dst[x] = n1 << 8 | n2;

213 }

214 dst += pitch / 4;

215 }

216 }

217 }

218

219 return 0;

220 }

221

222 static int svq1_decode_block_non_intra(GetBitContext *bitbuf, uint8_t *pixels,

223 int pitch)

224 {

225 uint32_t bit_cache;

226 uint8_t *list[63];

227 uint32_t *dst;

228 const uint32_t *codebook;

229 int entries[6];

230 int i, j, m, n;

231 int mean, stages;

232 int x, y, width, height, level;

233 uint32_t n1, n2, n3, n4;

234

235 /* initialize list for breadth first processing of vectors */

236 list[0] = pixels;

237

238 /* recursively process vector */

239 for (i = 0, m = 1, n = 1, level = 5; i < n; i++) {

240 SVQ1_PROCESS_VECTOR();

241

242 /* destination address and vector size */

243 dst = (uint32_t *)list[i];

244 width = 1 << ((4 + level) / 2);

245 height = 1 << ((3 + level) / 2);

246

247 /* get number of stages (-1 skips vector, 0 for mean only) */

248 stages = get_vlc2(bitbuf, svq1_inter_multistage[level].table, 3, 2) - 1;

249

250 if (stages == -1)

251 continue; /* skip vector */

252

253 if ((stages > 0 && level >= 4)) {

254 av_dlog(NULL,

255 "Error (svq1_decode_block_non_intra): invalid vector: stages=%i level=%i\n",

256 stages, level);

257 return AVERROR_INVALIDDATA; /* invalid vector */

258 }

259 av_assert0(stages >= 0);

260

261 mean = get_vlc2(bitbuf, svq1_inter_mean.table, 9, 3) - 256;

262

263 SVQ1_CALC_CODEBOOK_ENTRIES(ff_svq1_inter_codebooks);

264

265 for (y = 0; y < height; y++) {

266 for (x = 0; x < width / 4; x++, codebook++) {

267 n3 = dst[x];

268 /* add mean value to vector */

269 n1 = n4 + ((n3 & 0xFF00FF00) >> 8);

270 n2 = n4 + (n3 & 0x00FF00FF);

271 SVQ1_ADD_CODEBOOK()

272 /* store result */

273 dst[x] = n1 << 8 | n2;

274 }

275 dst += pitch / 4;

276 }

277 }

278 return 0;

279 }

280

281 static int svq1_decode_motion_vector(GetBitContext *bitbuf, svq1_pmv *mv,

282 svq1_pmv **pmv)

283 {

284 int diff;

285 int i;

286

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

288 /* get motion code */

289 diff = get_vlc2(bitbuf, svq1_motion_component.table, 7, 2);

290 if (diff < 0)

291 return AVERROR_INVALIDDATA;

292 else if (diff) {

293 if (get_bits1(bitbuf))

294 diff = -diff;

295 }

296

297 /* add median of motion vector predictors and clip result */

298 if (i == 1)

299 mv->y = sign_extend(diff + mid_pred(pmv[0]->y, pmv[1]->y, pmv[2]->y), 6);

300 else

301 mv->x = sign_extend(diff + mid_pred(pmv[0]->x, pmv[1]->x, pmv[2]->x), 6);

302 }

303

304 return 0;

305 }

306

307 static void svq1_skip_block(uint8_t *current, uint8_t *previous,

308 int pitch, int x, int y)

309 {

310 uint8_t *src;

311 uint8_t *dst;

312 int i;

313

314 src = &previous[x + y * pitch];

315 dst = current;

316

317 for (i = 0; i < 16; i++) {

318 memcpy(dst, src, 16);

319 src += pitch;

320 dst += pitch;

321 }

322 }

323

324 static int svq1_motion_inter_block(HpelDSPContext *hdsp, GetBitContext *bitbuf,

325 uint8_t *current, uint8_t *previous,

326 int pitch, svq1_pmv *motion, int x, int y,

327 int width, int height)

328 {

329 uint8_t *src;

330 uint8_t *dst;

331 svq1_pmv mv;

332 svq1_pmv *pmv[3];

333 int result;

334

335 /* predict and decode motion vector */

336 pmv[0] = &motion[0];

337 if (y == 0) {

338 pmv[1] =

339 pmv[2] = pmv[0];

340 } else {

341 pmv[1] = &motion[x / 8 + 2];

342 pmv[2] = &motion[x / 8 + 4];

343 }

344

345 result = svq1_decode_motion_vector(bitbuf, &mv, pmv);

346 if (result)

347 return result;

348

349 motion[0].x =

350 motion[x / 8 + 2].x =

351 motion[x / 8 + 3].x = mv.x;

352 motion[0].y =

353 motion[x / 8 + 2].y =

354 motion[x / 8 + 3].y = mv.y;

355

356 mv.x = av_clip(mv.x, -2 * x, 2 * (width - x - 16));

357 mv.y = av_clip(mv.y, -2 * y, 2 * (height - y - 16));

358

359 src = &previous[(x + (mv.x >> 1)) + (y + (mv.y >> 1)) * pitch];

360 dst = current;

361

362 hdsp->put_pixels_tab[0][(mv.y & 1) << 1 | (mv.x & 1)](dst, src, pitch, 16);

363

364 return 0;

365 }

366

367 static int svq1_motion_inter_4v_block(HpelDSPContext *hdsp, GetBitContext *bitbuf,

368 uint8_t *current, uint8_t *previous,

369 int pitch, svq1_pmv *motion, int x, int y,

370 int width, int height)

371 {

372 uint8_t *src;

373 uint8_t *dst;

374 svq1_pmv mv;

375 svq1_pmv *pmv[4];

376 int i, result;

377

378 /* predict and decode motion vector (0) */

379 pmv[0] = &motion[0];

380 if (y == 0) {

381 pmv[1] =

382 pmv[2] = pmv[0];

383 } else {

384 pmv[1] = &motion[(x / 8) + 2];

385 pmv[2] = &motion[(x / 8) + 4];

386 }

387

388 result = svq1_decode_motion_vector(bitbuf, &mv, pmv);

389 if (result)

390 return result;

391

392 /* predict and decode motion vector (1) */

393 pmv[0] = &mv;

394 if (y == 0) {

395 pmv[1] =

396 pmv[2] = pmv[0];

397 } else {

398 pmv[1] = &motion[(x / 8) + 3];

399 }

400 result = svq1_decode_motion_vector(bitbuf, &motion[0], pmv);

401 if (result)

402 return result;

403

404 /* predict and decode motion vector (2) */

405 pmv[1] = &motion[0];

406 pmv[2] = &motion[(x / 8) + 1];

407

408 result = svq1_decode_motion_vector(bitbuf, &motion[(x / 8) + 2], pmv);

409 if (result)

410 return result;

411

412 /* predict and decode motion vector (3) */

413 pmv[2] = &motion[(x / 8) + 2];

414 pmv[3] = &motion[(x / 8) + 3];

415

416 result = svq1_decode_motion_vector(bitbuf, pmv[3], pmv);

417 if (result)

418 return result;

419

420 /* form predictions */

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

422 int mvx = pmv[i]->x + (i & 1) * 16;

423 int mvy = pmv[i]->y + (i >> 1) * 16;

424

425 // FIXME: clipping or padding?

426 mvx = av_clip(mvx, -2 * x, 2 * (width - x - 8));

427 mvy = av_clip(mvy, -2 * y, 2 * (height - y - 8));

428

429 src = &previous[(x + (mvx >> 1)) + (y + (mvy >> 1)) * pitch];

430 dst = current;

431

432 hdsp->put_pixels_tab[1][((mvy & 1) << 1) | (mvx & 1)](dst, src, pitch, 8);

433

434 /* select next block */

435 if (i & 1)

436 current += 8 * (pitch - 1);

437 else

438 current += 8;

439 }

440

441 return 0;

442 }

443

444 static int svq1_decode_delta_block(AVCodecContext *avctx, HpelDSPContext *hdsp,

445 GetBitContext *bitbuf,

446 uint8_t *current, uint8_t *previous,

447 int pitch, svq1_pmv *motion, int x, int y,

448 int width, int height)

449 {

450 uint32_t block_type;

451 int result = 0;

452

453 /* get block type */

454 block_type = get_vlc2(bitbuf, svq1_block_type.table, 2, 2);

455

456 /* reset motion vectors */

457 if (block_type == SVQ1_BLOCK_SKIP || block_type == SVQ1_BLOCK_INTRA) {

458 motion[0].x =

459 motion[0].y =

460 motion[x / 8 + 2].x =

461 motion[x / 8 + 2].y =

462 motion[x / 8 + 3].x =

463 motion[x / 8 + 3].y = 0;

464 }

465

466 switch (block_type) {

467 case SVQ1_BLOCK_SKIP:

468 svq1_skip_block(current, previous, pitch, x, y);

469 break;

470

471 case SVQ1_BLOCK_INTER:

472 result = svq1_motion_inter_block(hdsp, bitbuf, current, previous,

473 pitch, motion, x, y, width, height);

474

475 if (result != 0) {

476 av_dlog(avctx, "Error in svq1_motion_inter_block %i\n", result);

477 break;

478 }

479 result = svq1_decode_block_non_intra(bitbuf, current, pitch);

480 break;

481

482 case SVQ1_BLOCK_INTER_4V:

483 result = svq1_motion_inter_4v_block(hdsp, bitbuf, current, previous,

484 pitch, motion, x, y, width, height);

485

486 if (result != 0) {

487 av_dlog(avctx, "Error in svq1_motion_inter_4v_block %i\n", result);

488 break;

489 }

490 result = svq1_decode_block_non_intra(bitbuf, current, pitch);

491 break;

492

493 case SVQ1_BLOCK_INTRA:

494 result = svq1_decode_block_intra(bitbuf, current, pitch);

495 break;

496 }

497

498 return result;

499 }

500

501 static void svq1_parse_string(GetBitContext *bitbuf, uint8_t out[257])

502 {

503 uint8_t seed;

504 int i;

505

506 out[0] = get_bits(bitbuf, 8);

507 seed = string_table[out[0]];

508

509 for (i = 1; i <= out[0]; i++) {

510 out[i] = get_bits(bitbuf, 8) ^ seed;

511 seed = string_table[out[i] ^ seed];

512 }

513 out[i] = 0;

514 }

515

516 static int svq1_decode_frame_header(AVCodecContext *avctx, AVFrame *frame)

517 {

518 SVQ1Context *s = avctx->priv_data;

519 GetBitContext *bitbuf = &s->gb;

520 int frame_size_code;

521 int width = s->width;

522 int height = s->height;

523

524 skip_bits(bitbuf, 8); /* temporal_reference */

525

526 /* frame type */

527 s->nonref = 0;

528 switch (get_bits(bitbuf, 2)) {

529 case 0:

530 frame->pict_type = AV_PICTURE_TYPE_I;

531 break;

532 case 2:

533 s->nonref = 1;

534 case 1:

535 frame->pict_type = AV_PICTURE_TYPE_P;

536 break;

537 default:

538 av_log(avctx, AV_LOG_ERROR, "Invalid frame type.\n");

539 return AVERROR_INVALIDDATA;

540 }

541

542 if (frame->pict_type == AV_PICTURE_TYPE_I) {

543 /* unknown fields */

544 if (s->frame_code == 0x50 || s->frame_code == 0x60) {

545 int csum = get_bits(bitbuf, 16);

546

547 csum = ff_svq1_packet_checksum(bitbuf->buffer,

548 bitbuf->size_in_bits >> 3,

549 csum);

550

551 av_dlog(avctx, "%s checksum (%02x) for packet data\n",

552 (csum == 0) ? "correct" : "incorrect", csum);

553 }

554

555 if ((s->frame_code ^ 0x10) >= 0x50) {

556 uint8_t msg[257];

557

558 svq1_parse_string(bitbuf, msg);

559

560 av_log(avctx, AV_LOG_INFO,

561 "embedded message:\n%s\n", ((char *)msg) + 1);

562 }

563

564 skip_bits(bitbuf, 2);

565 skip_bits(bitbuf, 2);

566 skip_bits1(bitbuf);

567

568 /* load frame size */

569 frame_size_code = get_bits(bitbuf, 3);

570

571 if (frame_size_code == 7) {

572 /* load width, height (12 bits each) */

573 width = get_bits(bitbuf, 12);

574 height = get_bits(bitbuf, 12);

575

576 if (!width || !height)

577 return AVERROR_INVALIDDATA;

578 } else {

579 /* get width, height from table */

580 width = ff_svq1_frame_size_table[frame_size_code][0];

581 height = ff_svq1_frame_size_table[frame_size_code][1];

582 }

583 }

584

585 /* unknown fields */

586 if (get_bits1(bitbuf)) {

587 skip_bits1(bitbuf); /* use packet checksum if (1) */

588 skip_bits1(bitbuf); /* component checksums after image data if (1) */

589

590 if (get_bits(bitbuf, 2) != 0)

591 return AVERROR_INVALIDDATA;

592 }

593

594 if (get_bits1(bitbuf)) {

595 skip_bits1(bitbuf);

596 skip_bits(bitbuf, 4);

597 skip_bits1(bitbuf);

598 skip_bits(bitbuf, 2);

599

600 if (skip_1stop_8data_bits(bitbuf) < 0)

601 return AVERROR_INVALIDDATA;

602 }

603

604 s->width = width;

605 s->height = height;

606 return 0;

607 }

608

609 static int svq1_decode_frame(AVCodecContext *avctx, void *data,

610 int *got_frame, AVPacket *avpkt)

611 {

612 const uint8_t *buf = avpkt->data;

613 int buf_size = avpkt->size;

614 SVQ1Context *s = avctx->priv_data;

615 AVFrame *cur = data;

616 uint8_t *current;

617 int result, i, x, y, width, height;

618 svq1_pmv *pmv;

619

620 /* initialize bit buffer */

621 init_get_bits8(&s->gb, buf, buf_size);

622

623 /* decode frame header */

624 s->frame_code = get_bits(&s->gb, 22);

625

626 if ((s->frame_code & ~0x70) || !(s->frame_code & 0x60))

627 return AVERROR_INVALIDDATA;

628

629 /* swap some header bytes (why?) */

630 if (s->frame_code != 0x20) {

631 uint32_t *src;

632

633 if (buf_size < 9 * 4) {

634 av_log(avctx, AV_LOG_ERROR, "Input packet too small\n");

635 return AVERROR_INVALIDDATA;

636 }

637

638 av_fast_padded_malloc(&s->pkt_swapped,

639 &s->pkt_swapped_allocated,

640 buf_size);

641 if (!s->pkt_swapped)

642 return AVERROR(ENOMEM);

643

644 memcpy(s->pkt_swapped, buf, buf_size);

645 buf = s->pkt_swapped;

646 init_get_bits(&s->gb, buf, buf_size * 8);

647 skip_bits(&s->gb, 22);

648

649 src = (uint32_t *)(s->pkt_swapped + 4);

650

651 if (buf_size < 36)

652 return AVERROR_INVALIDDATA;

653

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

655 src[i] = ((src[i] << 16) | (src[i] >> 16)) ^ src[7 - i];

656 }

657

658 result = svq1_decode_frame_header(avctx, cur);

659 if (result != 0) {

660 av_dlog(avctx, "Error in svq1_decode_frame_header %i\n", result);

661 return result;

662 }

663

664 result = ff_set_dimensions(avctx, s->width, s->height);

665 if (result < 0)

666 return result;

667

668 if ((avctx->skip_frame >= AVDISCARD_NONREF && s->nonref) ||

669 (avctx->skip_frame >= AVDISCARD_NONKEY &&

670 cur->pict_type != AV_PICTURE_TYPE_I) ||

671 avctx->skip_frame >= AVDISCARD_ALL)

672 return buf_size;

673

674 result = ff_get_buffer(avctx, cur, s->nonref ? 0 : AV_GET_BUFFER_FLAG_REF);

675 if (result < 0)

676 return result;

677

678 pmv = av_malloc((FFALIGN(s->width, 16) / 8 + 3) * sizeof(*pmv));

679 if (!pmv)

680 return AVERROR(ENOMEM);

681

682 /* decode y, u and v components */

683 for (i = 0; i < 3; i++) {

684 int linesize = cur->linesize[i];

685 if (i == 0) {

686 width = FFALIGN(s->width, 16);

687 height = FFALIGN(s->height, 16);

688 } else {

689 if (avctx->flags & CODEC_FLAG_GRAY)

690 break;

691 width = FFALIGN(s->width / 4, 16);

692 height = FFALIGN(s->height / 4, 16);

693 }

694

695 current = cur->data[i];

696

697 if (cur->pict_type == AV_PICTURE_TYPE_I) {

698 /* keyframe */

699 for (y = 0; y < height; y += 16) {

700 for (x = 0; x < width; x += 16) {

701 result = svq1_decode_block_intra(&s->gb, &current[x],

702 linesize);

703 if (result) {

704 av_log(avctx, AV_LOG_ERROR,

705 "Error in svq1_decode_block %i (keyframe)\n",

706 result);

707 goto err;

708 }

709 }

710 current += 16 * linesize;

711 }

712 } else {

713 /* delta frame */

714 uint8_t *previous = s->prev->data[i];

715 if (!previous ||

716 s->prev->width != s->width || s->prev->height != s->height) {

717 av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");

718 result = AVERROR_INVALIDDATA;

719 goto err;

720 }

721

722 memset(pmv, 0, ((width / 8) + 3) * sizeof(svq1_pmv));

723

724 for (y = 0; y < height; y += 16) {

725 for (x = 0; x < width; x += 16) {

726 result = svq1_decode_delta_block(avctx, &s->hdsp,

727 &s->gb, &current[x],

728 previous, linesize,

729 pmv, x, y, width, height);

730 if (result != 0) {

731 av_dlog(avctx,

732 "Error in svq1_decode_delta_block %i\n",

733 result);

734 goto err;

735 }

736 }

737

738 pmv[0].x =

739 pmv[0].y = 0;

740

741 current += 16 * linesize;

742 }

743 }

744 }

745

746 if (!s->nonref) {

747 av_frame_unref(s->prev);

748 result = av_frame_ref(s->prev, cur);

749 if (result < 0)

750 goto err;

751 }

752

753 *got_frame = 1;

754 result = buf_size;

755

756 err:

757 av_free(pmv);

758 return result;

759 }

760

761 static av_cold int svq1_decode_init(AVCodecContext *avctx)

762 {

763 SVQ1Context *s = avctx->priv_data;

764 int i;

765 int offset = 0;

766

767 s->prev = av_frame_alloc();

768 if (!s->prev)

769 return AVERROR(ENOMEM);

770

771 s->width = avctx->width + 3 & ~3;

772 s->height = avctx->height + 3 & ~3;

773 avctx->pix_fmt = AV_PIX_FMT_YUV410P;

774

775 ff_hpeldsp_init(&s->hdsp, avctx->flags);

776

777 INIT_VLC_STATIC(&svq1_block_type, 2, 4,

778 &ff_svq1_block_type_vlc[0][1], 2, 1,

779 &ff_svq1_block_type_vlc[0][0], 2, 1, 6);

780

781 INIT_VLC_STATIC(&svq1_motion_component, 7, 33,

782 &ff_mvtab[0][1], 2, 1,

783 &ff_mvtab[0][0], 2, 1, 176);

784

785 for (i = 0; i < 6; i++) {

786 static const uint8_t sizes[2][6] = { { 14, 10, 14, 18, 16, 18 },

787 { 10, 10, 14, 14, 14, 16 } };

788 static VLC_TYPE table[168][2];

789 svq1_intra_multistage[i].table = &table[offset];

790 svq1_intra_multistage[i].table_allocated = sizes[0][i];

791 offset += sizes[0][i];

792 init_vlc(&svq1_intra_multistage[i], 3, 8,

793 &ff_svq1_intra_multistage_vlc[i][0][1], 2, 1,

794 &ff_svq1_intra_multistage_vlc[i][0][0], 2, 1,

795 INIT_VLC_USE_NEW_STATIC);

796 svq1_inter_multistage[i].table = &table[offset];

797 svq1_inter_multistage[i].table_allocated = sizes[1][i];

798 offset += sizes[1][i];

799 init_vlc(&svq1_inter_multistage[i], 3, 8,

800 &ff_svq1_inter_multistage_vlc[i][0][1], 2, 1,

801 &ff_svq1_inter_multistage_vlc[i][0][0], 2, 1,

802 INIT_VLC_USE_NEW_STATIC);

803 }

804

805 INIT_VLC_STATIC(&svq1_intra_mean, 8, 256,

806 &ff_svq1_intra_mean_vlc[0][1], 4, 2,

807 &ff_svq1_intra_mean_vlc[0][0], 4, 2, 632);

808

809 INIT_VLC_STATIC(&svq1_inter_mean, 9, 512,

810 &ff_svq1_inter_mean_vlc[0][1], 4, 2,

811 &ff_svq1_inter_mean_vlc[0][0], 4, 2, 1434);

812

813 return 0;

814 }

815

816 static av_cold int svq1_decode_end(AVCodecContext *avctx)

817 {

818 SVQ1Context *s = avctx->priv_data;

819

820 av_frame_free(&s->prev);

821 av_freep(&s->pkt_swapped);

822 s->pkt_swapped_allocated = 0;

823

824 return 0;

825 }

826

827 static void svq1_flush(AVCodecContext *avctx)

828 {

829 SVQ1Context *s = avctx->priv_data;

830

831 av_frame_unref(s->prev);

832 }

833

834 AVCodec ff_svq1_decoder = {

835 .name = "svq1",

836 .long_name = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1"),

837 .type = AVMEDIA_TYPE_VIDEO,

838 .id = AV_CODEC_ID_SVQ1,

839 .priv_data_size = sizeof(SVQ1Context),

840 .init = svq1_decode_init,

841 .close = svq1_decode_end,

842 .decode = svq1_decode_frame,

843 .capabilities = CODEC_CAP_DR1,

844 .flush = svq1_flush,

845 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV410P,

846 AV_PIX_FMT_NONE },

847 };

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