FFmpeg: libavcodec/truemotion2.c Source File

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libavcodec

truemotion2.c

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1 /*

2 * Duck/ON2 TrueMotion 2 Decoder

4 *

5 * This file is part of FFmpeg.

6 *

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

8 * modify it under the terms of the GNU Lesser General Public

9 * License as published by the Free Software Foundation; either

10 * version 2.1 of the License, or (at your option) any later version.

11 *

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

13 * but WITHOUT ANY WARRANTY; without even the implied warranty of

14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

15 * Lesser General Public License for more details.

16 *

17 * You should have received a copy of the GNU Lesser General Public

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

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

20 */

22 /**

23 * @file

24 * Duck TrueMotion2 decoder.

25 */

27 #include "avcodec.h"

28 #include "bytestream.h"

29 #include "get_bits.h"

30 #include "dsputil.h"

31 #include "internal.h"

33 #define TM2_ESCAPE 0x80000000

34 #define TM2_DELTAS 64

36 /* Huffman-coded streams of different types of blocks */

37 enum TM2_STREAMS {

38 TM2_C_HI = 0,

39 TM2_C_LO,

40 TM2_L_HI,

41 TM2_L_LO,

42 TM2_UPD,

43 TM2_MOT,

44 TM2_TYPE,

45 TM2_NUM_STREAMS

46 };

48 /* Block types */

49 enum TM2_BLOCKS {

50 TM2_HI_RES = 0,

51 TM2_MED_RES,

52 TM2_LOW_RES,

53 TM2_NULL_RES,

54 TM2_UPDATE,

55 TM2_STILL,

56 TM2_MOTION

57 };

59 typedef struct TM2Context {

60 AVCodecContext *avctx;

61 AVFrame pic;

63 GetBitContext gb;

64 DSPContext dsp;

66 uint8_t *buffer;

67 int buffer_size;

69 /* TM2 streams */

70 int *tokens[TM2_NUM_STREAMS];

71 int tok_lens[TM2_NUM_STREAMS];

72 int tok_ptrs[TM2_NUM_STREAMS];

73 int deltas[TM2_NUM_STREAMS][TM2_DELTAS];

74 /* for blocks decoding */

75 int D[4];

76 int CD[4];

77 int *last;

78 int *clast;

80 /* data for current and previous frame */

81 int *Y1_base, *U1_base, *V1_base, *Y2_base, *U2_base, *V2_base;

82 int *Y1, *U1, *V1, *Y2, *U2, *V2;

83 int y_stride, uv_stride;

84 int cur;

85 } TM2Context;

87 /**

88 * Huffman codes for each of streams

89 */

90 typedef struct TM2Codes {

91 VLC vlc; ///< table for FFmpeg bitstream reader

92 int bits;

93 int *recode; ///< table for converting from code indexes to values

94 int length;

95 } TM2Codes;

97 /**

98 * structure for gathering Huffman codes information

99 */

100 typedef struct TM2Huff {

101 int val_bits; ///< length of literal

102 int max_bits; ///< maximum length of code

103 int min_bits; ///< minimum length of code

104 int nodes; ///< total number of nodes in tree

105 int num; ///< current number filled

106 int max_num; ///< total number of codes

107 int *nums; ///< literals

108 uint32_t *bits; ///< codes

109 int *lens; ///< codelengths

110 } TM2Huff;

111

112 static int tm2_read_tree(TM2Context *ctx, uint32_t prefix, int length, TM2Huff *huff)

113 {

114 int ret;

115 if (length > huff->max_bits) {

116 av_log(ctx->avctx, AV_LOG_ERROR, "Tree exceeded its given depth (%i)\n",

117 huff->max_bits);

118 return AVERROR_INVALIDDATA;

119 }

120

121 if (!get_bits1(&ctx->gb)) { /* literal */

122 if (length == 0) {

123 length = 1;

124 }

125 if (huff->num >= huff->max_num) {

126 av_log(ctx->avctx, AV_LOG_DEBUG, "Too many literals\n");

127 return AVERROR_INVALIDDATA;

128 }

129 huff->nums[huff->num] = get_bits_long(&ctx->gb, huff->val_bits);

130 huff->bits[huff->num] = prefix;

131 huff->lens[huff->num] = length;

132 huff->num++;

133 return 0;

134 } else { /* non-terminal node */

135 if ((ret = tm2_read_tree(ctx, prefix << 1, length + 1, huff)) < 0)

136 return ret;

137 if ((ret = tm2_read_tree(ctx, (prefix << 1) | 1, length + 1, huff)) < 0)

138 return ret;

139 }

140 return 0;

141 }

142

143 static int tm2_build_huff_table(TM2Context *ctx, TM2Codes *code)

144 {

145 TM2Huff huff;

146 int res = 0;

147

148 huff.val_bits = get_bits(&ctx->gb, 5);

149 huff.max_bits = get_bits(&ctx->gb, 5);

150 huff.min_bits = get_bits(&ctx->gb, 5);

151 huff.nodes = get_bits_long(&ctx->gb, 17);

152 huff.num = 0;

153

154 /* check for correct codes parameters */

155 if ((huff.val_bits < 1) || (huff.val_bits > 32) ||

156 (huff.max_bits < 0) || (huff.max_bits > 25)) {

157 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect tree parameters - literal "

158 "length: %i, max code length: %i\n", huff.val_bits, huff.max_bits);

159 return AVERROR_INVALIDDATA;

160 }

161 if ((huff.nodes <= 0) || (huff.nodes > 0x10000)) {

162 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of Huffman tree "

163 "nodes: %i\n", huff.nodes);

164 return AVERROR_INVALIDDATA;

165 }

166 /* one-node tree */

167 if (huff.max_bits == 0)

168 huff.max_bits = 1;

169

170 /* allocate space for codes - it is exactly ceil(nodes / 2) entries */

171 huff.max_num = (huff.nodes + 1) >> 1;

172 huff.nums = av_mallocz(huff.max_num * sizeof(int));

173 huff.bits = av_mallocz(huff.max_num * sizeof(uint32_t));

174 huff.lens = av_mallocz(huff.max_num * sizeof(int));

175

176 res = tm2_read_tree(ctx, 0, 0, &huff);

177

178 if (huff.num != huff.max_num) {

179 av_log(ctx->avctx, AV_LOG_ERROR, "Got less codes than expected: %i of %i\n",

180 huff.num, huff.max_num);

181 res = AVERROR_INVALIDDATA;

182 }

183

184 /* convert codes to vlc_table */

185 if (res >= 0) {

186 int i;

187

188 res = init_vlc(&code->vlc, huff.max_bits, huff.max_num,

189 huff.lens, sizeof(int), sizeof(int),

190 huff.bits, sizeof(uint32_t), sizeof(uint32_t), 0);

191 if (res < 0)

192 av_log(ctx->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");

193 else {

194 code->bits = huff.max_bits;

195 code->length = huff.max_num;

196 code->recode = av_malloc(code->length * sizeof(int));

197 for (i = 0; i < code->length; i++)

198 code->recode[i] = huff.nums[i];

199 }

200 }

201 /* free allocated memory */

202 av_free(huff.nums);

203 av_free(huff.bits);

204 av_free(huff.lens);

205

206 return res;

207 }

208

209 static void tm2_free_codes(TM2Codes *code)

210 {

211 av_free(code->recode);

212 if (code->vlc.table)

213 ff_free_vlc(&code->vlc);

214 }

215

216 static inline int tm2_get_token(GetBitContext *gb, TM2Codes *code)

217 {

218 int val;

219 val = get_vlc2(gb, code->vlc.table, code->bits, 1);

220 if(val<0)

221 return -1;

222 return code->recode[val];

223 }

224

225 #define TM2_OLD_HEADER_MAGIC 0x00000100

226 #define TM2_NEW_HEADER_MAGIC 0x00000101

227

228 static inline int tm2_read_header(TM2Context *ctx, const uint8_t *buf)

229 {

230 uint32_t magic = AV_RL32(buf);

231

232 switch (magic) {

233 case TM2_OLD_HEADER_MAGIC:

234 avpriv_request_sample(ctx->avctx, "Old TM2 header");

235 return 0;

236 case TM2_NEW_HEADER_MAGIC:

237 return 0;

238 default:

239 av_log(ctx->avctx, AV_LOG_ERROR, "Not a TM2 header: 0x%08X\n", magic);

240 return AVERROR_INVALIDDATA;

241 }

242 }

243

244 static int tm2_read_deltas(TM2Context *ctx, int stream_id)

245 {

246 int d, mb;

247 int i, v;

248

249 d = get_bits(&ctx->gb, 9);

250 mb = get_bits(&ctx->gb, 5);

251

252 if ((d < 1) || (d > TM2_DELTAS) || (mb < 1) || (mb > 32)) {

253 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect delta table: %i deltas x %i bits\n", d, mb);

254 return AVERROR_INVALIDDATA;

255 }

256

257 for (i = 0; i < d; i++) {

258 v = get_bits_long(&ctx->gb, mb);

259 if (v & (1 << (mb - 1)))

260 ctx->deltas[stream_id][i] = v - (1 << mb);

261 else

262 ctx->deltas[stream_id][i] = v;

263 }

264 for (; i < TM2_DELTAS; i++)

265 ctx->deltas[stream_id][i] = 0;

266

267 return 0;

268 }

269

270 static int tm2_read_stream(TM2Context *ctx, const uint8_t *buf, int stream_id, int buf_size)

271 {

272 int i, ret;

273 int skip = 0;

274 int len, toks, pos;

275 TM2Codes codes;

276 GetByteContext gb;

277

278 if (buf_size < 4) {

279 av_log(ctx->avctx, AV_LOG_ERROR, "not enough space for len left\n");

280 return AVERROR_INVALIDDATA;

281 }

282

283 /* get stream length in dwords */

284 bytestream2_init(&gb, buf, buf_size);

285 len = bytestream2_get_be32(&gb);

286 skip = len * 4 + 4;

287

288 if (len == 0)

289 return 4;

290

291 if (len >= INT_MAX/4-1 || len < 0 || skip > buf_size) {

292 av_log(ctx->avctx, AV_LOG_ERROR, "invalid stream size\n");

293 return AVERROR_INVALIDDATA;

294 }

295

296 toks = bytestream2_get_be32(&gb);

297 if (toks & 1) {

298 len = bytestream2_get_be32(&gb);

299 if (len == TM2_ESCAPE) {

300 len = bytestream2_get_be32(&gb);

301 }

302 if (len > 0) {

303 pos = bytestream2_tell(&gb);

304 if (skip <= pos)

305 return AVERROR_INVALIDDATA;

306 init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);

307 if ((ret = tm2_read_deltas(ctx, stream_id)) < 0)

308 return ret;

309 bytestream2_skip(&gb, ((get_bits_count(&ctx->gb) + 31) >> 5) << 2);

310 }

311 }

312 /* skip unused fields */

313 len = bytestream2_get_be32(&gb);

314 if (len == TM2_ESCAPE) { /* some unknown length - could be escaped too */

315 bytestream2_skip(&gb, 8); /* unused by decoder */

316 } else {

317 bytestream2_skip(&gb, 4); /* unused by decoder */

318 }

319

320 pos = bytestream2_tell(&gb);

321 if (skip <= pos)

322 return AVERROR_INVALIDDATA;

323 init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);

324 if ((ret = tm2_build_huff_table(ctx, &codes)) < 0)

325 return ret;

326 bytestream2_skip(&gb, ((get_bits_count(&ctx->gb) + 31) >> 5) << 2);

327

328 toks >>= 1;

329 /* check if we have sane number of tokens */

330 if ((toks < 0) || (toks > 0xFFFFFF)) {

331 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);

332 tm2_free_codes(&codes);

333 return AVERROR_INVALIDDATA;

334 }

335 ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));

336 ctx->tok_lens[stream_id] = toks;

337 len = bytestream2_get_be32(&gb);

338 if (len > 0) {

339 pos = bytestream2_tell(&gb);

340 if (skip <= pos)

341 return AVERROR_INVALIDDATA;

342 init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);

343 for (i = 0; i < toks; i++) {

344 if (get_bits_left(&ctx->gb) <= 0) {

345 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);

346 return AVERROR_INVALIDDATA;

347 }

348 ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);

349 if (stream_id <= TM2_MOT && ctx->tokens[stream_id][i] >= TM2_DELTAS || ctx->tokens[stream_id][i]<0) {

350 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid delta token index %d for type %d, n=%d\n",

351 ctx->tokens[stream_id][i], stream_id, i);

352 return AVERROR_INVALIDDATA;

353 }

354 }

355 } else {

356 for (i = 0; i < toks; i++) {

357 ctx->tokens[stream_id][i] = codes.recode[0];

358 if (stream_id <= TM2_MOT && ctx->tokens[stream_id][i] >= TM2_DELTAS) {

359 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid delta token index %d for type %d, n=%d\n",

360 ctx->tokens[stream_id][i], stream_id, i);

361 return AVERROR_INVALIDDATA;

362 }

363 }

364 }

365 tm2_free_codes(&codes);

366

367 return skip;

368 }

369

370 static inline int GET_TOK(TM2Context *ctx,int type)

371 {

372 if (ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {

373 av_log(ctx->avctx, AV_LOG_ERROR, "Read token from stream %i out of bounds (%i>=%i)\n", type, ctx->tok_ptrs[type], ctx->tok_lens[type]);

374 return 0;

375 }

376 if (type <= TM2_MOT) {

377 if (ctx->tokens[type][ctx->tok_ptrs[type]] >= TM2_DELTAS) {

378 av_log(ctx->avctx, AV_LOG_ERROR, "token %d is too large\n", ctx->tokens[type][ctx->tok_ptrs[type]]);

379 return 0;

380 }

381 return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];

382 }

383 return ctx->tokens[type][ctx->tok_ptrs[type]++];

384 }

385

386 /* blocks decoding routines */

387

388 /* common Y, U, V pointers initialisation */

389 #define TM2_INIT_POINTERS() \

390 int *last, *clast; \

391 int *Y, *U, *V;\

392 int Ystride, Ustride, Vstride;\

393 \

394 Ystride = ctx->y_stride;\

395 Vstride = ctx->uv_stride;\

396 Ustride = ctx->uv_stride;\

397 Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\

398 V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\

399 U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\

400 last = ctx->last + bx * 4;\

401 clast = ctx->clast + bx * 4;

402

403 #define TM2_INIT_POINTERS_2() \

404 int *Yo, *Uo, *Vo;\

405 int oYstride, oUstride, oVstride;\

406 \

407 TM2_INIT_POINTERS();\

408 oYstride = Ystride;\

409 oVstride = Vstride;\

410 oUstride = Ustride;\

411 Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\

412 Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\

413 Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;

414

415 /* recalculate last and delta values for next blocks */

416 #define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\

417 CD[0] = CHR[1] - last[1];\

418 CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\

419 last[0] = (int)CHR[stride + 0];\

420 last[1] = (int)CHR[stride + 1];}

421

422 /* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */

423 static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)

424 {

425 int ct, d;

426 int i, j;

427

428 for (j = 0; j < 4; j++){

429 ct = ctx->D[j];

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

431 d = deltas[i + j * 4];

432 ct += d;

433 last[i] += ct;

434 Y[i] = av_clip_uint8(last[i]);

435 }

436 Y += stride;

437 ctx->D[j] = ct;

438 }

439 }

440

441 static inline void tm2_high_chroma(int *data, int stride, int *last, int *CD, int *deltas)

442 {

443 int i, j;

444 for (j = 0; j < 2; j++) {

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

446 CD[j] += deltas[i + j * 2];

447 last[i] += CD[j];

448 data[i] = last[i];

449 }

450 data += stride;

451 }

452 }

453

454 static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)

455 {

456 int t;

457 int l;

458 int prev;

459

460 if (bx > 0)

461 prev = clast[-3];

462 else

463 prev = 0;

464 t = (CD[0] + CD[1]) >> 1;

465 l = (prev - CD[0] - CD[1] + clast[1]) >> 1;

466 CD[1] = CD[0] + CD[1] - t;

467 CD[0] = t;

468 clast[0] = l;

469

470 tm2_high_chroma(data, stride, clast, CD, deltas);

471 }

472

473 static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)

474 {

475 int i;

476 int deltas[16];

477 TM2_INIT_POINTERS();

478

479 /* hi-res chroma */

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

481 deltas[i] = GET_TOK(ctx, TM2_C_HI);

482 deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);

483 }

484 tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);

485 tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);

486

487 /* hi-res luma */

488 for (i = 0; i < 16; i++)

489 deltas[i] = GET_TOK(ctx, TM2_L_HI);

490

491 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);

492 }

493

494 static inline void tm2_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)

495 {

496 int i;

497 int deltas[16];

498 TM2_INIT_POINTERS();

499

500 /* low-res chroma */

501 deltas[0] = GET_TOK(ctx, TM2_C_LO);

502 deltas[1] = deltas[2] = deltas[3] = 0;

503 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);

504

505 deltas[0] = GET_TOK(ctx, TM2_C_LO);

506 deltas[1] = deltas[2] = deltas[3] = 0;

507 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);

508

509 /* hi-res luma */

510 for (i = 0; i < 16; i++)

511 deltas[i] = GET_TOK(ctx, TM2_L_HI);

512

513 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);

514 }

515

516 static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)

517 {

518 int i;

519 int t1, t2;

520 int deltas[16];

521 TM2_INIT_POINTERS();

522

523 /* low-res chroma */

524 deltas[0] = GET_TOK(ctx, TM2_C_LO);

525 deltas[1] = deltas[2] = deltas[3] = 0;

526 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);

527

528 deltas[0] = GET_TOK(ctx, TM2_C_LO);

529 deltas[1] = deltas[2] = deltas[3] = 0;

530 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);

531

532 /* low-res luma */

533 for (i = 0; i < 16; i++)

534 deltas[i] = 0;

535

536 deltas[ 0] = GET_TOK(ctx, TM2_L_LO);

537 deltas[ 2] = GET_TOK(ctx, TM2_L_LO);

538 deltas[ 8] = GET_TOK(ctx, TM2_L_LO);

539 deltas[10] = GET_TOK(ctx, TM2_L_LO);

540

541 if (bx > 0)

542 last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;

543 else

544 last[0] = (last[1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;

545 last[2] = (last[1] + last[3]) >> 1;

546

547 t1 = ctx->D[0] + ctx->D[1];

548 ctx->D[0] = t1 >> 1;

549 ctx->D[1] = t1 - (t1 >> 1);

550 t2 = ctx->D[2] + ctx->D[3];

551 ctx->D[2] = t2 >> 1;

552 ctx->D[3] = t2 - (t2 >> 1);

553

554 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);

555 }

556

557 static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)

558 {

559 int i;

560 int ct;

561 int left, right, diff;

562 int deltas[16];

563 TM2_INIT_POINTERS();

564

565 /* null chroma */

566 deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;

567 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);

568

569 deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;

570 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);

571

572 /* null luma */

573 for (i = 0; i < 16; i++)

574 deltas[i] = 0;

575

576 ct = ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];

577

578 if (bx > 0)

579 left = last[-1] - ct;

580 else

581 left = 0;

582

583 right = last[3];

584 diff = right - left;

585 last[0] = left + (diff >> 2);

586 last[1] = left + (diff >> 1);

587 last[2] = right - (diff >> 2);

588 last[3] = right;

589 {

590 int tp = left;

591

592 ctx->D[0] = (tp + (ct >> 2)) - left;

593 left += ctx->D[0];

594 ctx->D[1] = (tp + (ct >> 1)) - left;

595 left += ctx->D[1];

596 ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;

597 left += ctx->D[2];

598 ctx->D[3] = (tp + ct) - left;

599 }

600 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);

601 }

602

603 static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)

604 {

605 int i, j;

606 TM2_INIT_POINTERS_2();

607

608 /* update chroma */

609 for (j = 0; j < 2; j++) {

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

611 U[i] = Uo[i];

612 V[i] = Vo[i];

613 }

614 U += Ustride; V += Vstride;

615 Uo += oUstride; Vo += oVstride;

616 }

617 U -= Ustride * 2;

618 V -= Vstride * 2;

619 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);

620 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));

621

622 /* update deltas */

623 ctx->D[0] = Yo[3] - last[3];

624 ctx->D[1] = Yo[3 + oYstride] - Yo[3];

625 ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];

626 ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];

627

628 for (j = 0; j < 4; j++) {

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

630 Y[i] = Yo[i];

631 last[i] = Yo[i];

632 }

633 Y += Ystride;

634 Yo += oYstride;

635 }

636 }

637

638 static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)

639 {

640 int i, j;

641 int d;

642 TM2_INIT_POINTERS_2();

643

644 /* update chroma */

645 for (j = 0; j < 2; j++) {

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

647 U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);

648 V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);

649 }

650 U += Ustride;

651 V += Vstride;

652 Uo += oUstride;

653 Vo += oVstride;

654 }

655 U -= Ustride * 2;

656 V -= Vstride * 2;

657 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);

658 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));

659

660 /* update deltas */

661 ctx->D[0] = Yo[3] - last[3];

662 ctx->D[1] = Yo[3 + oYstride] - Yo[3];

663 ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];

664 ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];

665

666 for (j = 0; j < 4; j++) {

667 d = last[3];

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

669 Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);

670 last[i] = Y[i];

671 }

672 ctx->D[j] = last[3] - d;

673 Y += Ystride;

674 Yo += oYstride;

675 }

676 }

677

678 static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)

679 {

680 int i, j;

681 int mx, my;

682 TM2_INIT_POINTERS_2();

683

684 mx = GET_TOK(ctx, TM2_MOT);

685 my = GET_TOK(ctx, TM2_MOT);

686 mx = av_clip(mx, -(bx * 4 + 4), ctx->avctx->width - bx * 4);

687 my = av_clip(my, -(by * 4 + 4), ctx->avctx->height - by * 4);

688

689 if (4*bx+mx<0 || 4*by+my<0 || 4*bx+mx+4 > ctx->avctx->width || 4*by+my+4 > ctx->avctx->height) {

690 av_log(ctx->avctx, AV_LOG_ERROR, "MV out of picture\n");

691 return;

692 }

693

694 Yo += my * oYstride + mx;

695 Uo += (my >> 1) * oUstride + (mx >> 1);

696 Vo += (my >> 1) * oVstride + (mx >> 1);

697

698 /* copy chroma */

699 for (j = 0; j < 2; j++) {

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

701 U[i] = Uo[i];

702 V[i] = Vo[i];

703 }

704 U += Ustride;

705 V += Vstride;

706 Uo += oUstride;

707 Vo += oVstride;

708 }

709 U -= Ustride * 2;

710 V -= Vstride * 2;

711 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);

712 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));

713

714 /* copy luma */

715 for (j = 0; j < 4; j++) {

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

717 Y[i] = Yo[i];

718 }

719 Y += Ystride;

720 Yo += oYstride;

721 }

722 /* calculate deltas */

723 Y -= Ystride * 4;

724 ctx->D[0] = Y[3] - last[3];

725 ctx->D[1] = Y[3 + Ystride] - Y[3];

726 ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];

727 ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];

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

729 last[i] = Y[i + Ystride * 3];

730 }

731

732 static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)

733 {

734 int i, j;

735 int w = ctx->avctx->width, h = ctx->avctx->height, bw = w >> 2, bh = h >> 2, cw = w >> 1;

736 int type;

737 int keyframe = 1;

738 int *Y, *U, *V;

739 uint8_t *dst;

740

741 for (i = 0; i < TM2_NUM_STREAMS; i++)

742 ctx->tok_ptrs[i] = 0;

743

744 if (ctx->tok_lens[TM2_TYPE]<bw*bh) {

745 av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);

746 return AVERROR_INVALIDDATA;

747 }

748

749 memset(ctx->last, 0, 4 * bw * sizeof(int));

750 memset(ctx->clast, 0, 4 * bw * sizeof(int));

751

752 for (j = 0; j < bh; j++) {

753 memset(ctx->D, 0, 4 * sizeof(int));

754 memset(ctx->CD, 0, 4 * sizeof(int));

755 for (i = 0; i < bw; i++) {

756 type = GET_TOK(ctx, TM2_TYPE);

757 switch(type) {

758 case TM2_HI_RES:

759 tm2_hi_res_block(ctx, p, i, j);

760 break;

761 case TM2_MED_RES:

762 tm2_med_res_block(ctx, p, i, j);

763 break;

764 case TM2_LOW_RES:

765 tm2_low_res_block(ctx, p, i, j);

766 break;

767 case TM2_NULL_RES:

768 tm2_null_res_block(ctx, p, i, j);

769 break;

770 case TM2_UPDATE:

771 tm2_update_block(ctx, p, i, j);

772 keyframe = 0;

773 break;

774 case TM2_STILL:

775 tm2_still_block(ctx, p, i, j);

776 keyframe = 0;

777 break;

778 case TM2_MOTION:

779 tm2_motion_block(ctx, p, i, j);

780 keyframe = 0;

781 break;

782 default:

783 av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);

784 }

785 }

786 }

787

788 /* copy data from our buffer to AVFrame */

789 Y = (ctx->cur?ctx->Y2:ctx->Y1);

790 U = (ctx->cur?ctx->U2:ctx->U1);

791 V = (ctx->cur?ctx->V2:ctx->V1);

792 dst = p->data[0];

793 for (j = 0; j < h; j++) {

794 for (i = 0; i < w; i++) {

795 int y = Y[i], u = U[i >> 1], v = V[i >> 1];

796 dst[3*i+0] = av_clip_uint8(y + v);

797 dst[3*i+1] = av_clip_uint8(y);

798 dst[3*i+2] = av_clip_uint8(y + u);

799 }

800

801 /* horizontal edge extension */

802 Y[-4] = Y[-3] = Y[-2] = Y[-1] = Y[0];

803 Y[w + 3] = Y[w + 2] = Y[w + 1] = Y[w] = Y[w - 1];

804

805 /* vertical edge extension */

806 if (j == 0) {

807 memcpy(Y - 4 - 1 * ctx->y_stride, Y - 4, ctx->y_stride);

808 memcpy(Y - 4 - 2 * ctx->y_stride, Y - 4, ctx->y_stride);

809 memcpy(Y - 4 - 3 * ctx->y_stride, Y - 4, ctx->y_stride);

810 memcpy(Y - 4 - 4 * ctx->y_stride, Y - 4, ctx->y_stride);

811 } else if (j == h - 1) {

812 memcpy(Y - 4 + 1 * ctx->y_stride, Y - 4, ctx->y_stride);

813 memcpy(Y - 4 + 2 * ctx->y_stride, Y - 4, ctx->y_stride);

814 memcpy(Y - 4 + 3 * ctx->y_stride, Y - 4, ctx->y_stride);

815 memcpy(Y - 4 + 4 * ctx->y_stride, Y - 4, ctx->y_stride);

816 }

817

818 Y += ctx->y_stride;

819 if (j & 1) {

820 /* horizontal edge extension */

821 U[-2] = U[-1] = U[0];

822 V[-2] = V[-1] = V[0];

823 U[cw + 1] = U[cw] = U[cw - 1];

824 V[cw + 1] = V[cw] = V[cw - 1];

825

826 /* vertical edge extension */

827 if (j == 1) {

828 memcpy(U - 2 - 1 * ctx->uv_stride, U - 2, ctx->uv_stride);

829 memcpy(V - 2 - 1 * ctx->uv_stride, V - 2, ctx->uv_stride);

830 memcpy(U - 2 - 2 * ctx->uv_stride, U - 2, ctx->uv_stride);

831 memcpy(V - 2 - 2 * ctx->uv_stride, V - 2, ctx->uv_stride);

832 } else if (j == h - 1) {

833 memcpy(U - 2 + 1 * ctx->uv_stride, U - 2, ctx->uv_stride);

834 memcpy(V - 2 + 1 * ctx->uv_stride, V - 2, ctx->uv_stride);

835 memcpy(U - 2 + 2 * ctx->uv_stride, U - 2, ctx->uv_stride);

836 memcpy(V - 2 + 2 * ctx->uv_stride, V - 2, ctx->uv_stride);

837 }

838

839 U += ctx->uv_stride;

840 V += ctx->uv_stride;

841 }

842 dst += p->linesize[0];

843 }

844

845 return keyframe;

846 }

847

848 static const int tm2_stream_order[TM2_NUM_STREAMS] = {

849 TM2_C_HI, TM2_C_LO, TM2_L_HI, TM2_L_LO, TM2_UPD, TM2_MOT, TM2_TYPE

850 };

851

852 #define TM2_HEADER_SIZE 40

853

854 static int decode_frame(AVCodecContext *avctx,

855 void *data, int *got_frame,

856 AVPacket *avpkt)

857 {

858 TM2Context * const l = avctx->priv_data;

859 const uint8_t *buf = avpkt->data;

860 int buf_size = avpkt->size & ~3;

861 AVFrame * const p = &l->pic;

862 int offset = TM2_HEADER_SIZE;

863 int i, t, ret;

864

865 av_fast_padded_malloc(&l->buffer, &l->buffer_size, buf_size);

866 if (!l->buffer) {

867 av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");

868 return AVERROR(ENOMEM);

869 }

870

871 if ((ret = ff_reget_buffer(avctx, p)) < 0)

872 return ret;

873

874 l->dsp.bswap_buf((uint32_t*)l->buffer, (const uint32_t*)buf, buf_size >> 2);

875

876 if ((ret = tm2_read_header(l, l->buffer)) < 0) {

877 return ret;

878 }

879

880 for (i = 0; i < TM2_NUM_STREAMS; i++) {

881 if (offset >= buf_size) {

882 av_log(avctx, AV_LOG_ERROR, "no space for tm2_read_stream\n");

883 return AVERROR_INVALIDDATA;

884 }

885

886 t = tm2_read_stream(l, l->buffer + offset, tm2_stream_order[i],

887 buf_size - offset);

888 if (t < 0) {

889 int j = tm2_stream_order[i];

890 memset(l->tokens[j], 0, sizeof(**l->tokens) * l->tok_lens[j]);

891 return t;

892 }

893 offset += t;

894 }

895 p->key_frame = tm2_decode_blocks(l, p);

896 if (p->key_frame)

897 p->pict_type = AV_PICTURE_TYPE_I;

898 else

899 p->pict_type = AV_PICTURE_TYPE_P;

900

901 l->cur = !l->cur;

902 *got_frame = 1;

903 ret = av_frame_ref(data, &l->pic);

904

905 return (ret < 0) ? ret : buf_size;

906 }

907

908 static av_cold int decode_init(AVCodecContext *avctx)

909 {

910 TM2Context * const l = avctx->priv_data;

911 int i, w = avctx->width, h = avctx->height;

912

913 if ((avctx->width & 3) || (avctx->height & 3)) {

914 av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");

915 return AVERROR(EINVAL);

916 }

917

918 l->avctx = avctx;

919 avcodec_get_frame_defaults(&l->pic);

920 avctx->pix_fmt = AV_PIX_FMT_BGR24;

921

922 ff_dsputil_init(&l->dsp, avctx);

923

924 l->last = av_malloc(4 * sizeof(*l->last) * (w >> 2));

925 l->clast = av_malloc(4 * sizeof(*l->clast) * (w >> 2));

926

927 for (i = 0; i < TM2_NUM_STREAMS; i++) {

928 l->tokens[i] = NULL;

929 l->tok_lens[i] = 0;

930 }

931

932 w += 8;

933 h += 8;

934 l->Y1_base = av_mallocz(sizeof(*l->Y1_base) * w * h);

935 l->Y2_base = av_mallocz(sizeof(*l->Y2_base) * w * h);

936 l->y_stride = w;

937 w = (w + 1) >> 1;

938 h = (h + 1) >> 1;

939 l->U1_base = av_mallocz(sizeof(*l->U1_base) * w * h);

940 l->V1_base = av_mallocz(sizeof(*l->V1_base) * w * h);

941 l->U2_base = av_mallocz(sizeof(*l->U2_base) * w * h);

942 l->V2_base = av_mallocz(sizeof(*l->V1_base) * w * h);

943 l->uv_stride = w;

944 l->cur = 0;

945 if (!l->Y1_base || !l->Y2_base || !l->U1_base ||

946 !l->V1_base || !l->U2_base || !l->V2_base ||

947 !l->last || !l->clast) {

948 av_freep(l->Y1_base);

949 av_freep(l->Y2_base);

950 av_freep(l->U1_base);

951 av_freep(l->U2_base);

952 av_freep(l->V1_base);

953 av_freep(l->V2_base);

954 av_freep(l->last);

955 av_freep(l->clast);

956 return AVERROR(ENOMEM);

957 }

958 l->Y1 = l->Y1_base + l->y_stride * 4 + 4;

959 l->Y2 = l->Y2_base + l->y_stride * 4 + 4;

960 l->U1 = l->U1_base + l->uv_stride * 2 + 2;

961 l->U2 = l->U2_base + l->uv_stride * 2 + 2;

962 l->V1 = l->V1_base + l->uv_stride * 2 + 2;

963 l->V2 = l->V2_base + l->uv_stride * 2 + 2;

964

965 return 0;

966 }

967

968 static av_cold int decode_end(AVCodecContext *avctx)

969 {

970 TM2Context * const l = avctx->priv_data;

971 AVFrame *pic = &l->pic;

972 int i;

973

974 av_free(l->last);

975 av_free(l->clast);

976 for (i = 0; i < TM2_NUM_STREAMS; i++)

977 av_free(l->tokens[i]);

978 if (l->Y1) {

979 av_free(l->Y1_base);

980 av_free(l->U1_base);

981 av_free(l->V1_base);

982 av_free(l->Y2_base);

983 av_free(l->U2_base);

984 av_free(l->V2_base);

985 }

986 av_freep(&l->buffer);

987 l->buffer_size = 0;

988

989 av_frame_unref(pic);

990

991 return 0;

992 }

993

994 AVCodec ff_truemotion2_decoder = {

995 .name = "truemotion2",

996 .type = AVMEDIA_TYPE_VIDEO,

997 .id = AV_CODEC_ID_TRUEMOTION2,

998 .priv_data_size = sizeof(TM2Context),

999 .init = decode_init,

1000 .close = decode_end,

1001 .decode = decode_frame,

1002 .capabilities = CODEC_CAP_DR1,

1003 .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),

1004 };

Generated on Wed Jul 10 2013 23:48:05 for FFmpeg by doxygen 1.8.2