FFmpeg: libavcodec/truemotion1.c Source File

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truemotion1.c

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1 /*

2 * Duck TrueMotion 1.0 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 TrueMotion v1 Video Decoder by

25 * Alex Beregszaszi and

26 * Mike Melanson (melanson@pcisys.net)

27 *

28 * The TrueMotion v1 decoder presently only decodes 16-bit TM1 data and

29 * outputs RGB555 (or RGB565) data. 24-bit TM1 data is not supported yet.

30 */

32 #include <stdio.h>

33 #include <stdlib.h>

34 #include <string.h>

36 #include "avcodec.h"

37 #include "dsputil.h"

38 #include "libavutil/imgutils.h"

39 #include "libavutil/internal.h"

40 #include "libavutil/mem.h"

42 #include "truemotion1data.h"

44 typedef struct TrueMotion1Context {

45 AVCodecContext *avctx;

46 AVFrame frame;

48 const uint8_t *buf;

49 int size;

51 const uint8_t *mb_change_bits;

52 int mb_change_bits_row_size;

53 const uint8_t *index_stream;

54 int index_stream_size;

56 int flags;

57 int x, y, w, h;

59 uint32_t y_predictor_table[1024];

60 uint32_t c_predictor_table[1024];

61 uint32_t fat_y_predictor_table[1024];

62 uint32_t fat_c_predictor_table[1024];

64 int compression;

65 int block_type;

66 int block_width;

67 int block_height;

69 int16_t ydt[8];

70 int16_t cdt[8];

71 int16_t fat_ydt[8];

72 int16_t fat_cdt[8];

74 int last_deltaset, last_vectable;

76 unsigned int *vert_pred;

77 int vert_pred_size;

79 } TrueMotion1Context;

81 #define FLAG_SPRITE 32

82 #define FLAG_KEYFRAME 16

83 #define FLAG_INTERFRAME 8

84 #define FLAG_INTERPOLATED 4

86 struct frame_header {

87 uint8_t header_size;

88 uint8_t compression;

89 uint8_t deltaset;

90 uint8_t vectable;

91 uint16_t ysize;

92 uint16_t xsize;

93 uint16_t checksum;

94 uint8_t version;

95 uint8_t header_type;

96 uint8_t flags;

97 uint8_t control;

98 uint16_t xoffset;

99 uint16_t yoffset;

100 uint16_t width;

101 uint16_t height;

102 };

103

104 #define ALGO_NOP 0

105 #define ALGO_RGB16V 1

106 #define ALGO_RGB16H 2

107 #define ALGO_RGB24H 3

108

109 /* these are the various block sizes that can occupy a 4x4 block */

110 #define BLOCK_2x2 0

111 #define BLOCK_2x4 1

112 #define BLOCK_4x2 2

113 #define BLOCK_4x4 3

114

115 typedef struct comp_types {

116 int algorithm;

117 int block_width; // vres

118 int block_height; // hres

119 int block_type;

120 } comp_types;

121

122 /* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */

123 static const comp_types compression_types[17] = {

124 { ALGO_NOP, 0, 0, 0 },

125

126 { ALGO_RGB16V, 4, 4, BLOCK_4x4 },

127 { ALGO_RGB16H, 4, 4, BLOCK_4x4 },

128 { ALGO_RGB16V, 4, 2, BLOCK_4x2 },

129 { ALGO_RGB16H, 4, 2, BLOCK_4x2 },

130

131 { ALGO_RGB16V, 2, 4, BLOCK_2x4 },

132 { ALGO_RGB16H, 2, 4, BLOCK_2x4 },

133 { ALGO_RGB16V, 2, 2, BLOCK_2x2 },

134 { ALGO_RGB16H, 2, 2, BLOCK_2x2 },

135

136 { ALGO_NOP, 4, 4, BLOCK_4x4 },

137 { ALGO_RGB24H, 4, 4, BLOCK_4x4 },

138 { ALGO_NOP, 4, 2, BLOCK_4x2 },

139 { ALGO_RGB24H, 4, 2, BLOCK_4x2 },

140

141 { ALGO_NOP, 2, 4, BLOCK_2x4 },

142 { ALGO_RGB24H, 2, 4, BLOCK_2x4 },

143 { ALGO_NOP, 2, 2, BLOCK_2x2 },

144 { ALGO_RGB24H, 2, 2, BLOCK_2x2 }

145 };

146

147 static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)

148 {

149 int i;

150

151 if (delta_table_index > 3)

152 return;

153

154 memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));

155 memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));

156 memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));

157 memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));

158

159 /* Y skinny deltas need to be halved for some reason; maybe the

160 * skinny Y deltas should be modified */

161 for (i = 0; i < 8; i++)

162 {

163 /* drop the lsb before dividing by 2-- net effect: round down

164 * when dividing a negative number (e.g., -3/2 = -2, not -1) */

165 s->ydt[i] &= 0xFFFE;

166 s->ydt[i] /= 2;

167 }

168 }

169

170 #if HAVE_BIGENDIAN

171 static int make_ydt15_entry(int p2, int p1, int16_t *ydt)

172 #else

173 static int make_ydt15_entry(int p1, int p2, int16_t *ydt)

174 #endif

175 {

176 int lo, hi;

177

178 lo = ydt[p1];

179 lo += (lo << 5) + (lo << 10);

180 hi = ydt[p2];

181 hi += (hi << 5) + (hi << 10);

182 return (lo + (hi << 16)) << 1;

183 }

184

185 static int make_cdt15_entry(int p1, int p2, int16_t *cdt)

186 {

187 int r, b, lo;

188

189 b = cdt[p2];

190 r = cdt[p1] << 10;

191 lo = b + r;

192 return (lo + (lo << 16)) << 1;

193 }

194

195 #if HAVE_BIGENDIAN

196 static int make_ydt16_entry(int p2, int p1, int16_t *ydt)

197 #else

198 static int make_ydt16_entry(int p1, int p2, int16_t *ydt)

199 #endif

200 {

201 int lo, hi;

202

203 lo = ydt[p1];

204 lo += (lo << 6) + (lo << 11);

205 hi = ydt[p2];

206 hi += (hi << 6) + (hi << 11);

207 return (lo + (hi << 16)) << 1;

208 }

209

210 static int make_cdt16_entry(int p1, int p2, int16_t *cdt)

211 {

212 int r, b, lo;

213

214 b = cdt[p2];

215 r = cdt[p1] << 11;

216 lo = b + r;

217 return (lo + (lo << 16)) << 1;

218 }

219

220 static int make_ydt24_entry(int p1, int p2, int16_t *ydt)

221 {

222 int lo, hi;

223

224 lo = ydt[p1];

225 hi = ydt[p2];

226 return (lo + (hi << 8) + (hi << 16)) << 1;

227 }

228

229 static int make_cdt24_entry(int p1, int p2, int16_t *cdt)

230 {

231 int r, b;

232

233 b = cdt[p2];

234 r = cdt[p1]<<16;

235 return (b+r) << 1;

236 }

237

238 static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)

239 {

240 int len, i, j;

241 unsigned char delta_pair;

242

243 for (i = 0; i < 1024; i += 4)

244 {

245 len = *sel_vector_table++ / 2;

246 for (j = 0; j < len; j++)

247 {

248 delta_pair = *sel_vector_table++;

249 s->y_predictor_table[i+j] = 0xfffffffe &

250 make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);

251 s->c_predictor_table[i+j] = 0xfffffffe &

252 make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);

253 }

254 s->y_predictor_table[i+(j-1)] |= 1;

255 s->c_predictor_table[i+(j-1)] |= 1;

256 }

257 }

258

259 static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)

260 {

261 int len, i, j;

262 unsigned char delta_pair;

263

264 for (i = 0; i < 1024; i += 4)

265 {

266 len = *sel_vector_table++ / 2;

267 for (j = 0; j < len; j++)

268 {

269 delta_pair = *sel_vector_table++;

270 s->y_predictor_table[i+j] = 0xfffffffe &

271 make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);

272 s->c_predictor_table[i+j] = 0xfffffffe &

273 make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);

274 }

275 s->y_predictor_table[i+(j-1)] |= 1;

276 s->c_predictor_table[i+(j-1)] |= 1;

277 }

278 }

279

280 static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)

281 {

282 int len, i, j;

283 unsigned char delta_pair;

284

285 for (i = 0; i < 1024; i += 4)

286 {

287 len = *sel_vector_table++ / 2;

288 for (j = 0; j < len; j++)

289 {

290 delta_pair = *sel_vector_table++;

291 s->y_predictor_table[i+j] = 0xfffffffe &

292 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);

293 s->c_predictor_table[i+j] = 0xfffffffe &

294 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);

295 s->fat_y_predictor_table[i+j] = 0xfffffffe &

296 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);

297 s->fat_c_predictor_table[i+j] = 0xfffffffe &

298 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);

299 }

300 s->y_predictor_table[i+(j-1)] |= 1;

301 s->c_predictor_table[i+(j-1)] |= 1;

302 s->fat_y_predictor_table[i+(j-1)] |= 1;

303 s->fat_c_predictor_table[i+(j-1)] |= 1;

304 }

305 }

306

307 /* Returns the number of bytes consumed from the bytestream. Returns -1 if

308 * there was an error while decoding the header */

309 static int truemotion1_decode_header(TrueMotion1Context *s)

310 {

311 int i;

312 int width_shift = 0;

313 int new_pix_fmt;

314 struct frame_header header;

315 uint8_t header_buffer[128] = { 0 }; /* logical maximum size of the header */

316 const uint8_t *sel_vector_table;

317

318 header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;

319 if (s->buf[0] < 0x10 || header.header_size >= s->size)

320 {

321 av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);

322 return -1;

323 }

324

325 /* unscramble the header bytes with a XOR operation */

326 for (i = 1; i < header.header_size; i++)

327 header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];

328

329 header.compression = header_buffer[0];

330 header.deltaset = header_buffer[1];

331 header.vectable = header_buffer[2];

332 header.ysize = AV_RL16(&header_buffer[3]);

333 header.xsize = AV_RL16(&header_buffer[5]);

334 header.checksum = AV_RL16(&header_buffer[7]);

335 header.version = header_buffer[9];

336 header.header_type = header_buffer[10];

337 header.flags = header_buffer[11];

338 header.control = header_buffer[12];

339

340 /* Version 2 */

341 if (header.version >= 2)

342 {

343 if (header.header_type > 3)

344 {

345 av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);

346 return -1;

347 } else if ((header.header_type == 2) || (header.header_type == 3)) {

348 s->flags = header.flags;

349 if (!(s->flags & FLAG_INTERFRAME))

350 s->flags |= FLAG_KEYFRAME;

351 } else

352 s->flags = FLAG_KEYFRAME;

353 } else /* Version 1 */

354 s->flags = FLAG_KEYFRAME;

355

356 if (s->flags & FLAG_SPRITE) {

357 av_log_ask_for_sample(s->avctx, "SPRITE frame found.\n");

358 /* FIXME header.width, height, xoffset and yoffset aren't initialized */

359 return AVERROR_PATCHWELCOME;

360 } else {

361 s->w = header.xsize;

362 s->h = header.ysize;

363 if (header.header_type < 2) {

364 if ((s->w < 213) && (s->h >= 176))

365 {

366 s->flags |= FLAG_INTERPOLATED;

367 av_log_ask_for_sample(s->avctx, "INTERPOLATION selected.\n");

368 }

369 }

370 }

371

372 if (header.compression >= 17) {

373 av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);

374 return -1;

375 }

376

377 if ((header.deltaset != s->last_deltaset) ||

378 (header.vectable != s->last_vectable))

379 select_delta_tables(s, header.deltaset);

380

381 if ((header.compression & 1) && header.header_type)

382 sel_vector_table = pc_tbl2;

383 else {

384 if (header.vectable > 0 && header.vectable < 4)

385 sel_vector_table = tables[header.vectable - 1];

386 else {

387 av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);

388 return -1;

389 }

390 }

391

392 if (compression_types[header.compression].algorithm == ALGO_RGB24H) {

393 new_pix_fmt = AV_PIX_FMT_RGB32;

394 width_shift = 1;

395 } else

396 new_pix_fmt = AV_PIX_FMT_RGB555; // RGB565 is supported as well

397

398 s->w >>= width_shift;

399 if (av_image_check_size(s->w, s->h, 0, s->avctx) < 0)

400 return -1;

401

402 if (s->w != s->avctx->width || s->h != s->avctx->height ||

403 new_pix_fmt != s->avctx->pix_fmt) {

404 if (s->frame.data[0])

405 s->avctx->release_buffer(s->avctx, &s->frame);

406 s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 };

407 s->avctx->pix_fmt = new_pix_fmt;

408 avcodec_set_dimensions(s->avctx, s->w, s->h);

409 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));

410 }

411

412 /* There is 1 change bit per 4 pixels, so each change byte represents

413 * 32 pixels; divide width by 4 to obtain the number of change bits and

414 * then round up to the nearest byte. */

415 s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3;

416

417 if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))

418 {

419 if (compression_types[header.compression].algorithm == ALGO_RGB24H)

420 gen_vector_table24(s, sel_vector_table);

421 else

422 if (s->avctx->pix_fmt == AV_PIX_FMT_RGB555)

423 gen_vector_table15(s, sel_vector_table);

424 else

425 gen_vector_table16(s, sel_vector_table);

426 }

427

428 /* set up pointers to the other key data chunks */

429 s->mb_change_bits = s->buf + header.header_size;

430 if (s->flags & FLAG_KEYFRAME) {

431 /* no change bits specified for a keyframe; only index bytes */

432 s->index_stream = s->mb_change_bits;

433 } else {

434 /* one change bit per 4x4 block */

435 s->index_stream = s->mb_change_bits +

436 (s->mb_change_bits_row_size * (s->avctx->height >> 2));

437 }

438 s->index_stream_size = s->size - (s->index_stream - s->buf);

439

440 s->last_deltaset = header.deltaset;

441 s->last_vectable = header.vectable;

442 s->compression = header.compression;

443 s->block_width = compression_types[header.compression].block_width;

444 s->block_height = compression_types[header.compression].block_height;

445 s->block_type = compression_types[header.compression].block_type;

446

447 if (s->avctx->debug & FF_DEBUG_PICT_INFO)

448 av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",

449 s->last_deltaset, s->last_vectable, s->compression, s->block_width,

450 s->block_height, s->block_type,

451 s->flags & FLAG_KEYFRAME ? " KEY" : "",

452 s->flags & FLAG_INTERFRAME ? " INTER" : "",

453 s->flags & FLAG_SPRITE ? " SPRITE" : "",

454 s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");

455

456 return header.header_size;

457 }

458

459 static av_cold int truemotion1_decode_init(AVCodecContext *avctx)

460 {

461 TrueMotion1Context *s = avctx->priv_data;

462

463 s->avctx = avctx;

464

465 // FIXME: it may change ?

466 // if (avctx->bits_per_sample == 24)

467 // avctx->pix_fmt = AV_PIX_FMT_RGB24;

468 // else

469 // avctx->pix_fmt = AV_PIX_FMT_RGB555;

470

471 avcodec_get_frame_defaults(&s->frame);

472 s->frame.data[0] = NULL;

473

474 /* there is a vertical predictor for each pixel in a line; each vertical

475 * predictor is 0 to start with */

476 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));

477

478 return 0;

479 }

480

481 /*

482 Block decoding order:

483

484 dxi: Y-Y

485 dxic: Y-C-Y

486 dxic2: Y-C-Y-C

487

488 hres,vres,i,i%vres (0 < i < 4)

489 2x2 0: 0 dxic2

490 2x2 1: 1 dxi

491 2x2 2: 0 dxic2

492 2x2 3: 1 dxi

493 2x4 0: 0 dxic2

494 2x4 1: 1 dxi

495 2x4 2: 2 dxi

496 2x4 3: 3 dxi

497 4x2 0: 0 dxic

498 4x2 1: 1 dxi

499 4x2 2: 0 dxic

500 4x2 3: 1 dxi

501 4x4 0: 0 dxic

502 4x4 1: 1 dxi

503 4x4 2: 2 dxi

504 4x4 3: 3 dxi

505 */

506

507 #define GET_NEXT_INDEX() \

508 {\

509 if (index_stream_index >= s->index_stream_size) { \

510 av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \

511 return; \

512 } \

513 index = s->index_stream[index_stream_index++] * 4; \

514 }

515

516 #define APPLY_C_PREDICTOR() \

517 if(index > 1023){\

518 av_log(s->avctx, AV_LOG_ERROR, " index %d went out of bounds\n", index); \

519 return; \

520 }\

521 predictor_pair = s->c_predictor_table[index]; \

522 horiz_pred += (predictor_pair >> 1); \

523 if (predictor_pair & 1) { \

524 GET_NEXT_INDEX() \

525 if (!index) { \

526 GET_NEXT_INDEX() \

527 predictor_pair = s->c_predictor_table[index]; \

528 horiz_pred += ((predictor_pair >> 1) * 5); \

529 if (predictor_pair & 1) \

530 GET_NEXT_INDEX() \

531 else \

532 index++; \

533 } \

534 } else \

535 index++;

536

537 #define APPLY_C_PREDICTOR_24() \

538 if(index > 1023){\

539 av_log(s->avctx, AV_LOG_ERROR, " index %d went out of bounds\n", index); \

540 return; \

541 }\

542 predictor_pair = s->c_predictor_table[index]; \

543 horiz_pred += (predictor_pair >> 1); \

544 if (predictor_pair & 1) { \

545 GET_NEXT_INDEX() \

546 if (!index) { \

547 GET_NEXT_INDEX() \

548 predictor_pair = s->fat_c_predictor_table[index]; \

549 horiz_pred += (predictor_pair >> 1); \

550 if (predictor_pair & 1) \

551 GET_NEXT_INDEX() \

552 else \

553 index++; \

554 } \

555 } else \

556 index++;

557

558

559 #define APPLY_Y_PREDICTOR() \

560 if(index > 1023){\

561 av_log(s->avctx, AV_LOG_ERROR, " index %d went out of bounds\n", index); \

562 return; \

563 }\

564 predictor_pair = s->y_predictor_table[index]; \

565 horiz_pred += (predictor_pair >> 1); \

566 if (predictor_pair & 1) { \

567 GET_NEXT_INDEX() \

568 if (!index) { \

569 GET_NEXT_INDEX() \

570 predictor_pair = s->y_predictor_table[index]; \

571 horiz_pred += ((predictor_pair >> 1) * 5); \

572 if (predictor_pair & 1) \

573 GET_NEXT_INDEX() \

574 else \

575 index++; \

576 } \

577 } else \

578 index++;

579

580 #define APPLY_Y_PREDICTOR_24() \

581 if(index > 1023){\

582 av_log(s->avctx, AV_LOG_ERROR, " index %d went out of bounds\n", index); \

583 return; \

584 }\

585 predictor_pair = s->y_predictor_table[index]; \

586 horiz_pred += (predictor_pair >> 1); \

587 if (predictor_pair & 1) { \

588 GET_NEXT_INDEX() \

589 if (!index) { \

590 GET_NEXT_INDEX() \

591 predictor_pair = s->fat_y_predictor_table[index]; \

592 horiz_pred += (predictor_pair >> 1); \

593 if (predictor_pair & 1) \

594 GET_NEXT_INDEX() \

595 else \

596 index++; \

597 } \

598 } else \

599 index++;

600

601 #define OUTPUT_PIXEL_PAIR() \

602 *current_pixel_pair = *vert_pred + horiz_pred; \

603 *vert_pred++ = *current_pixel_pair++;

604

605 static void truemotion1_decode_16bit(TrueMotion1Context *s)

606 {

607 int y;

608 int pixels_left; /* remaining pixels on this line */

609 unsigned int predictor_pair;

610 unsigned int horiz_pred;

611 unsigned int *vert_pred;

612 unsigned int *current_pixel_pair;

613 unsigned char *current_line = s->frame.data[0];

614 int keyframe = s->flags & FLAG_KEYFRAME;

615

616 /* these variables are for managing the stream of macroblock change bits */

617 const unsigned char *mb_change_bits = s->mb_change_bits;

618 unsigned char mb_change_byte;

619 unsigned char mb_change_byte_mask;

620 int mb_change_index;

621

622 /* these variables are for managing the main index stream */

623 int index_stream_index = 0; /* yes, the index into the index stream */

624 int index;

625

626 /* clean out the line buffer */

627 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));

628

629 GET_NEXT_INDEX();

630

631 for (y = 0; y < s->avctx->height; y++) {

632

633 /* re-init variables for the next line iteration */

634 horiz_pred = 0;

635 current_pixel_pair = (unsigned int *)current_line;

636 vert_pred = s->vert_pred;

637 mb_change_index = 0;

638 mb_change_byte = mb_change_bits[mb_change_index++];

639 mb_change_byte_mask = 0x01;

640 pixels_left = s->avctx->width;

641

642 while (pixels_left > 0) {

643

644 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {

645

646 switch (y & 3) {

647 case 0:

648 /* if macroblock width is 2, apply C-Y-C-Y; else

649 * apply C-Y-Y */

650 if (s->block_width == 2) {

651 APPLY_C_PREDICTOR();

652 APPLY_Y_PREDICTOR();

653 OUTPUT_PIXEL_PAIR();

654 APPLY_C_PREDICTOR();

655 APPLY_Y_PREDICTOR();

656 OUTPUT_PIXEL_PAIR();

657 } else {

658 APPLY_C_PREDICTOR();

659 APPLY_Y_PREDICTOR();

660 OUTPUT_PIXEL_PAIR();

661 APPLY_Y_PREDICTOR();

662 OUTPUT_PIXEL_PAIR();

663 }

664 break;

665

666 case 1:

667 case 3:

668 /* always apply 2 Y predictors on these iterations */

669 APPLY_Y_PREDICTOR();

670 OUTPUT_PIXEL_PAIR();

671 APPLY_Y_PREDICTOR();

672 OUTPUT_PIXEL_PAIR();

673 break;

674

675 case 2:

676 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y

677 * depending on the macroblock type */

678 if (s->block_type == BLOCK_2x2) {

679 APPLY_C_PREDICTOR();

680 APPLY_Y_PREDICTOR();

681 OUTPUT_PIXEL_PAIR();

682 APPLY_C_PREDICTOR();

683 APPLY_Y_PREDICTOR();

684 OUTPUT_PIXEL_PAIR();

685 } else if (s->block_type == BLOCK_4x2) {

686 APPLY_C_PREDICTOR();

687 APPLY_Y_PREDICTOR();

688 OUTPUT_PIXEL_PAIR();

689 APPLY_Y_PREDICTOR();

690 OUTPUT_PIXEL_PAIR();

691 } else {

692 APPLY_Y_PREDICTOR();

693 OUTPUT_PIXEL_PAIR();

694 APPLY_Y_PREDICTOR();

695 OUTPUT_PIXEL_PAIR();

696 }

697 break;

698 }

699

700 } else {

701

702 /* skip (copy) four pixels, but reassign the horizontal

703 * predictor */

704 *vert_pred++ = *current_pixel_pair++;

705 horiz_pred = *current_pixel_pair - *vert_pred;

706 *vert_pred++ = *current_pixel_pair++;

707

708 }

709

710 if (!keyframe) {

711 mb_change_byte_mask <<= 1;

712

713 /* next byte */

714 if (!mb_change_byte_mask) {

715 mb_change_byte = mb_change_bits[mb_change_index++];

716 mb_change_byte_mask = 0x01;

717 }

718 }

719

720 pixels_left -= 4;

721 }

722

723 /* next change row */

724 if (((y + 1) & 3) == 0)

725 mb_change_bits += s->mb_change_bits_row_size;

726

727 current_line += s->frame.linesize[0];

728 }

729 }

730

731 static void truemotion1_decode_24bit(TrueMotion1Context *s)

732 {

733 int y;

734 int pixels_left; /* remaining pixels on this line */

735 unsigned int predictor_pair;

736 unsigned int horiz_pred;

737 unsigned int *vert_pred;

738 unsigned int *current_pixel_pair;

739 unsigned char *current_line = s->frame.data[0];

740 int keyframe = s->flags & FLAG_KEYFRAME;

741

742 /* these variables are for managing the stream of macroblock change bits */

743 const unsigned char *mb_change_bits = s->mb_change_bits;

744 unsigned char mb_change_byte;

745 unsigned char mb_change_byte_mask;

746 int mb_change_index;

747

748 /* these variables are for managing the main index stream */

749 int index_stream_index = 0; /* yes, the index into the index stream */

750 int index;

751

752 /* clean out the line buffer */

753 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));

754

755 GET_NEXT_INDEX();

756

757 for (y = 0; y < s->avctx->height; y++) {

758

759 /* re-init variables for the next line iteration */

760 horiz_pred = 0;

761 current_pixel_pair = (unsigned int *)current_line;

762 vert_pred = s->vert_pred;

763 mb_change_index = 0;

764 mb_change_byte = mb_change_bits[mb_change_index++];

765 mb_change_byte_mask = 0x01;

766 pixels_left = s->avctx->width;

767

768 while (pixels_left > 0) {

769

770 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {

771

772 switch (y & 3) {

773 case 0:

774 /* if macroblock width is 2, apply C-Y-C-Y; else

775 * apply C-Y-Y */

776 if (s->block_width == 2) {

777 APPLY_C_PREDICTOR_24();

778 APPLY_Y_PREDICTOR_24();

779 OUTPUT_PIXEL_PAIR();

780 APPLY_C_PREDICTOR_24();

781 APPLY_Y_PREDICTOR_24();

782 OUTPUT_PIXEL_PAIR();

783 } else {

784 APPLY_C_PREDICTOR_24();

785 APPLY_Y_PREDICTOR_24();

786 OUTPUT_PIXEL_PAIR();

787 APPLY_Y_PREDICTOR_24();

788 OUTPUT_PIXEL_PAIR();

789 }

790 break;

791

792 case 1:

793 case 3:

794 /* always apply 2 Y predictors on these iterations */

795 APPLY_Y_PREDICTOR_24();

796 OUTPUT_PIXEL_PAIR();

797 APPLY_Y_PREDICTOR_24();

798 OUTPUT_PIXEL_PAIR();

799 break;

800

801 case 2:

802 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y

803 * depending on the macroblock type */

804 if (s->block_type == BLOCK_2x2) {

805 APPLY_C_PREDICTOR_24();

806 APPLY_Y_PREDICTOR_24();

807 OUTPUT_PIXEL_PAIR();

808 APPLY_C_PREDICTOR_24();

809 APPLY_Y_PREDICTOR_24();

810 OUTPUT_PIXEL_PAIR();

811 } else if (s->block_type == BLOCK_4x2) {

812 APPLY_C_PREDICTOR_24();

813 APPLY_Y_PREDICTOR_24();

814 OUTPUT_PIXEL_PAIR();

815 APPLY_Y_PREDICTOR_24();

816 OUTPUT_PIXEL_PAIR();

817 } else {

818 APPLY_Y_PREDICTOR_24();

819 OUTPUT_PIXEL_PAIR();

820 APPLY_Y_PREDICTOR_24();

821 OUTPUT_PIXEL_PAIR();

822 }

823 break;

824 }

825

826 } else {

827

828 /* skip (copy) four pixels, but reassign the horizontal

829 * predictor */

830 *vert_pred++ = *current_pixel_pair++;

831 horiz_pred = *current_pixel_pair - *vert_pred;

832 *vert_pred++ = *current_pixel_pair++;

833

834 }

835

836 if (!keyframe) {

837 mb_change_byte_mask <<= 1;

838

839 /* next byte */

840 if (!mb_change_byte_mask) {

841 mb_change_byte = mb_change_bits[mb_change_index++];

842 mb_change_byte_mask = 0x01;

843 }

844 }

845

846 pixels_left -= 2;

847 }

848

849 /* next change row */

850 if (((y + 1) & 3) == 0)

851 mb_change_bits += s->mb_change_bits_row_size;

852

853 current_line += s->frame.linesize[0];

854 }

855 }

856

857

858 static int truemotion1_decode_frame(AVCodecContext *avctx,

859 void *data, int *got_frame,

860 AVPacket *avpkt)

861 {

862 const uint8_t *buf = avpkt->data;

863 int buf_size = avpkt->size;

864 TrueMotion1Context *s = avctx->priv_data;

865

866 s->buf = buf;

867 s->size = buf_size;

868

869 if (truemotion1_decode_header(s) == -1)

870 return -1;

871

872 s->frame.reference = 3;

873 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID |

874 FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;

875 if (avctx->reget_buffer(avctx, &s->frame) < 0) {

876 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

877 return -1;

878 }

879

880 if (compression_types[s->compression].algorithm == ALGO_RGB24H) {

881 truemotion1_decode_24bit(s);

882 } else if (compression_types[s->compression].algorithm != ALGO_NOP) {

883 truemotion1_decode_16bit(s);

884 }

885

886 *got_frame = 1;

887 *(AVFrame*)data = s->frame;

888

889 /* report that the buffer was completely consumed */

890 return buf_size;

891 }

892

893 static av_cold int truemotion1_decode_end(AVCodecContext *avctx)

894 {

895 TrueMotion1Context *s = avctx->priv_data;

896

897 if (s->frame.data[0])

898 avctx->release_buffer(avctx, &s->frame);

899

900 av_free(s->vert_pred);

901

902 return 0;

903 }

904

905 AVCodec ff_truemotion1_decoder = {

906 .name = "truemotion1",

907 .type = AVMEDIA_TYPE_VIDEO,

908 .id = AV_CODEC_ID_TRUEMOTION1,

909 .priv_data_size = sizeof(TrueMotion1Context),

910 .init = truemotion1_decode_init,

911 .close = truemotion1_decode_end,

912 .decode = truemotion1_decode_frame,

913 .capabilities = CODEC_CAP_DR1,

914 .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),

915 };

Generated on Sat May 25 2013 03:58:41 for FFmpeg by doxygen 1.8.2