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 "internal.h"

38 #include "libavutil/imgutils.h"

39 #include "libavutil/internal.h"

40 #include "libavutil/intreadwrite.h"

41 #include "libavutil/mem.h"

43 #include "truemotion1data.h"

45 typedef struct TrueMotion1Context {

46 AVCodecContext *avctx;

47 AVFrame *frame;

49 const uint8_t *buf;

50 int size;

52 const uint8_t *mb_change_bits;

53 int mb_change_bits_row_size;

54 const uint8_t *index_stream;

55 int index_stream_size;

57 int flags;

58 int x, y, w, h;

60 uint32_t y_predictor_table[1024];

61 uint32_t c_predictor_table[1024];

62 uint32_t fat_y_predictor_table[1024];

63 uint32_t fat_c_predictor_table[1024];

65 int compression;

66 int block_type;

67 int block_width;

68 int block_height;

70 int16_t ydt[8];

71 int16_t cdt[8];

72 int16_t fat_ydt[8];

73 int16_t fat_cdt[8];

75 int last_deltaset, last_vectable;

77 unsigned int *vert_pred;

78 int vert_pred_size;

80 } TrueMotion1Context;

82 #define FLAG_SPRITE 32

83 #define FLAG_KEYFRAME 16

84 #define FLAG_INTERFRAME 8

85 #define FLAG_INTERPOLATED 4

87 struct frame_header {

88 uint8_t header_size;

89 uint8_t compression;

90 uint8_t deltaset;

91 uint8_t vectable;

92 uint16_t ysize;

93 uint16_t xsize;

94 uint16_t checksum;

95 uint8_t version;

96 uint8_t header_type;

97 uint8_t flags;

98 uint8_t control;

99 uint16_t xoffset;

100 uint16_t yoffset;

101 uint16_t width;

102 uint16_t height;

103 };

104

105 #define ALGO_NOP 0

106 #define ALGO_RGB16V 1

107 #define ALGO_RGB16H 2

108 #define ALGO_RGB24H 3

109

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

111 #define BLOCK_2x2 0

112 #define BLOCK_2x4 1

113 #define BLOCK_4x2 2

114 #define BLOCK_4x4 3

115

116 typedef struct comp_types {

117 int algorithm;

118 int block_width; // vres

119 int block_height; // hres

120 int block_type;

121 } comp_types;

122

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

124 static const comp_types compression_types[17] = {

125 { ALGO_NOP, 0, 0, 0 },

126

127 { ALGO_RGB16V, 4, 4, BLOCK_4x4 },

128 { ALGO_RGB16H, 4, 4, BLOCK_4x4 },

129 { ALGO_RGB16V, 4, 2, BLOCK_4x2 },

130 { ALGO_RGB16H, 4, 2, BLOCK_4x2 },

131

132 { ALGO_RGB16V, 2, 4, BLOCK_2x4 },

133 { ALGO_RGB16H, 2, 4, BLOCK_2x4 },

134 { ALGO_RGB16V, 2, 2, BLOCK_2x2 },

135 { ALGO_RGB16H, 2, 2, BLOCK_2x2 },

136

137 { ALGO_NOP, 4, 4, BLOCK_4x4 },

138 { ALGO_RGB24H, 4, 4, BLOCK_4x4 },

139 { ALGO_NOP, 4, 2, BLOCK_4x2 },

140 { ALGO_RGB24H, 4, 2, BLOCK_4x2 },

141

142 { ALGO_NOP, 2, 4, BLOCK_2x4 },

143 { ALGO_RGB24H, 2, 4, BLOCK_2x4 },

144 { ALGO_NOP, 2, 2, BLOCK_2x2 },

145 { ALGO_RGB24H, 2, 2, BLOCK_2x2 }

146 };

147

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

149 {

150 int i;

151

152 if (delta_table_index > 3)

153 return;

154

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

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

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

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

159

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

161 * skinny Y deltas should be modified */

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

163 {

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

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

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

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

168 }

169 }

170

171 #if HAVE_BIGENDIAN

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

173 #else

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

175 #endif

176 {

177 int lo, hi;

178

179 lo = ydt[p1];

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

181 hi = ydt[p2];

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

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

184 }

185

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

187 {

188 int r, b, lo;

189

190 b = cdt[p2];

191 r = cdt[p1] << 10;

192 lo = b + r;

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

194 }

195

196 #if HAVE_BIGENDIAN

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

198 #else

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

200 #endif

201 {

202 int lo, hi;

203

204 lo = ydt[p1];

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

206 hi = ydt[p2];

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

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

209 }

210

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

212 {

213 int r, b, lo;

214

215 b = cdt[p2];

216 r = cdt[p1] << 11;

217 lo = b + r;

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

219 }

220

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

222 {

223 int lo, hi;

224

225 lo = ydt[p1];

226 hi = ydt[p2];

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

228 }

229

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

231 {

232 int r, b;

233

234 b = cdt[p2];

235 r = cdt[p1]<<16;

236 return (b+r) << 1;

237 }

238

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

240 {

241 int len, i, j;

242 unsigned char delta_pair;

243

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

245 {

246 len = *sel_vector_table++ / 2;

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

248 {

249 delta_pair = *sel_vector_table++;

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

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

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

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

254 }

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

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

257 }

258 }

259

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

261 {

262 int len, i, j;

263 unsigned char delta_pair;

264

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

266 {

267 len = *sel_vector_table++ / 2;

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

269 {

270 delta_pair = *sel_vector_table++;

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

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

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

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

275 }

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

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

278 }

279 }

280

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

282 {

283 int len, i, j;

284 unsigned char delta_pair;

285

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

287 {

288 len = *sel_vector_table++ / 2;

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

290 {

291 delta_pair = *sel_vector_table++;

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

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

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

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

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

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

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

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

300 }

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

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

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

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

305 }

306 }

307

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

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

310 static int truemotion1_decode_header(TrueMotion1Context *s)

311 {

312 int i, ret;

313 int width_shift = 0;

314 int new_pix_fmt;

315 struct frame_header header;

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

317 const uint8_t *sel_vector_table;

318

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

320 if (s->buf[0] < 0x10)

321 {

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

323 return AVERROR_INVALIDDATA;

324 }

325

326 if (header.header_size + 1 > s->size) {

327 av_log(s->avctx, AV_LOG_ERROR, "Input packet too small.\n");

328 return AVERROR_INVALIDDATA;

329 }

330

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

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

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

334

335 header.compression = header_buffer[0];

336 header.deltaset = header_buffer[1];

337 header.vectable = header_buffer[2];

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

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

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

341 header.version = header_buffer[9];

342 header.header_type = header_buffer[10];

343 header.flags = header_buffer[11];

344 header.control = header_buffer[12];

345

346 /* Version 2 */

347 if (header.version >= 2)

348 {

349 if (header.header_type > 3)

350 {

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

352 return AVERROR_INVALIDDATA;

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

354 s->flags = header.flags;

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

356 s->flags |= FLAG_KEYFRAME;

357 } else

358 s->flags = FLAG_KEYFRAME;

359 } else /* Version 1 */

360 s->flags = FLAG_KEYFRAME;

361

362 if (s->flags & FLAG_SPRITE) {

363 avpriv_request_sample(s->avctx, "Frame with sprite");

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

365 return AVERROR_PATCHWELCOME;

366 } else {

367 s->w = header.xsize;

368 s->h = header.ysize;

369 if (header.header_type < 2) {

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

371 {

372 s->flags |= FLAG_INTERPOLATED;

373 avpriv_request_sample(s->avctx, "Interpolated frame");

374 }

375 }

376 }

377

378 if (header.compression >= 17) {

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

380 return AVERROR_INVALIDDATA;

381 }

382

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

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

385 select_delta_tables(s, header.deltaset);

386

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

388 sel_vector_table = pc_tbl2;

389 else {

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

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

392 else {

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

394 return AVERROR_INVALIDDATA;

395 }

396 }

397

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

399 new_pix_fmt = AV_PIX_FMT_RGB32;

400 width_shift = 1;

401 } else

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

403

404 s->w >>= width_shift;

405

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

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

408 av_frame_unref(s->frame);

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

410 s->avctx->pix_fmt = new_pix_fmt;

411

412 if ((ret = ff_set_dimensions(s->avctx, s->w, s->h)) < 0)

413 return ret;

414

415 ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);

416

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

418 if (!s->vert_pred)

419 return AVERROR(ENOMEM);

420 }

421

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

423 * 32 pixels; divide width by 4 to obtain the number of change bits and

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

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

426

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

428 {

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

430 gen_vector_table24(s, sel_vector_table);

431 else

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

433 gen_vector_table15(s, sel_vector_table);

434 else

435 gen_vector_table16(s, sel_vector_table);

436 }

437

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

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

440 if (s->flags & FLAG_KEYFRAME) {

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

442 s->index_stream = s->mb_change_bits;

443 } else {

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

445 s->index_stream = s->mb_change_bits +

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

447 }

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

449

450 s->last_deltaset = header.deltaset;

451 s->last_vectable = header.vectable;

452 s->compression = header.compression;

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

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

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

456

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

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

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

460 s->block_height, s->block_type,

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

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

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

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

465

466 return header.header_size;

467 }

468

469 static av_cold int truemotion1_decode_init(AVCodecContext *avctx)

470 {

471 TrueMotion1Context *s = avctx->priv_data;

472

473 s->avctx = avctx;

474

475 // FIXME: it may change ?

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

477 // avctx->pix_fmt = AV_PIX_FMT_RGB24;

478 // else

479 // avctx->pix_fmt = AV_PIX_FMT_RGB555;

480

481 s->frame = av_frame_alloc();

482 if (!s->frame)

483 return AVERROR(ENOMEM);

484

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

486 * predictor is 0 to start with */

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

488 if (!s->vert_pred)

489 return AVERROR(ENOMEM);

490

491 return 0;

492 }

493

494 /*

495 Block decoding order:

496

497 dxi: Y-Y

498 dxic: Y-C-Y

499 dxic2: Y-C-Y-C

500

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

502 2x2 0: 0 dxic2

503 2x2 1: 1 dxi

504 2x2 2: 0 dxic2

505 2x2 3: 1 dxi

506 2x4 0: 0 dxic2

507 2x4 1: 1 dxi

508 2x4 2: 2 dxi

509 2x4 3: 3 dxi

510 4x2 0: 0 dxic

511 4x2 1: 1 dxi

512 4x2 2: 0 dxic

513 4x2 3: 1 dxi

514 4x4 0: 0 dxic

515 4x4 1: 1 dxi

516 4x4 2: 2 dxi

517 4x4 3: 3 dxi

518 */

519

520 #define GET_NEXT_INDEX() \

521 {\

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

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

524 return; \

525 } \

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

527 }

528

529 #define INC_INDEX \

530 do { \

531 if (index >= 1023) { \

532 av_log(s->avctx, AV_LOG_ERROR, "Invalid index value.\n"); \

533 return; \

534 } \

535 index++; \

536 } while (0)

537

538 #define APPLY_C_PREDICTOR() \

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

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

541 if (predictor_pair & 1) { \

542 GET_NEXT_INDEX() \

543 if (!index) { \

544 GET_NEXT_INDEX() \

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

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

547 if (predictor_pair & 1) \

548 GET_NEXT_INDEX() \

549 else \

550 INC_INDEX; \

551 } \

552 } else \

553 INC_INDEX;

554

555 #define APPLY_C_PREDICTOR_24() \

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

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

558 if (predictor_pair & 1) { \

559 GET_NEXT_INDEX() \

560 if (!index) { \

561 GET_NEXT_INDEX() \

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

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

564 if (predictor_pair & 1) \

565 GET_NEXT_INDEX() \

566 else \

567 INC_INDEX; \

568 } \

569 } else \

570 INC_INDEX;

571

572

573 #define APPLY_Y_PREDICTOR() \

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

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

576 if (predictor_pair & 1) { \

577 GET_NEXT_INDEX() \

578 if (!index) { \

579 GET_NEXT_INDEX() \

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

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

582 if (predictor_pair & 1) \

583 GET_NEXT_INDEX() \

584 else \

585 INC_INDEX; \

586 } \

587 } else \

588 INC_INDEX;

589

590 #define APPLY_Y_PREDICTOR_24() \

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

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

593 if (predictor_pair & 1) { \

594 GET_NEXT_INDEX() \

595 if (!index) { \

596 GET_NEXT_INDEX() \

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

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

599 if (predictor_pair & 1) \

600 GET_NEXT_INDEX() \

601 else \

602 INC_INDEX; \

603 } \

604 } else \

605 INC_INDEX;

606

607 #define OUTPUT_PIXEL_PAIR() \

608 *current_pixel_pair = *vert_pred + horiz_pred; \

609 *vert_pred++ = *current_pixel_pair++;

610

611 static void truemotion1_decode_16bit(TrueMotion1Context *s)

612 {

613 int y;

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

615 unsigned int predictor_pair;

616 unsigned int horiz_pred;

617 unsigned int *vert_pred;

618 unsigned int *current_pixel_pair;

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

620 int keyframe = s->flags & FLAG_KEYFRAME;

621

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

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

624 unsigned char mb_change_byte;

625 unsigned char mb_change_byte_mask;

626 int mb_change_index;

627

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

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

630 int index;

631

632 /* clean out the line buffer */

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

634

635 GET_NEXT_INDEX();

636

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

638

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

640 horiz_pred = 0;

641 current_pixel_pair = (unsigned int *)current_line;

642 vert_pred = s->vert_pred;

643 mb_change_index = 0;

644 mb_change_byte = mb_change_bits[mb_change_index++];

645 mb_change_byte_mask = 0x01;

646 pixels_left = s->avctx->width;

647

648 while (pixels_left > 0) {

649

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

651

652 switch (y & 3) {

653 case 0:

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

655 * apply C-Y-Y */

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

657 APPLY_C_PREDICTOR();

658 APPLY_Y_PREDICTOR();

659 OUTPUT_PIXEL_PAIR();

660 APPLY_C_PREDICTOR();

661 APPLY_Y_PREDICTOR();

662 OUTPUT_PIXEL_PAIR();

663 } else {

664 APPLY_C_PREDICTOR();

665 APPLY_Y_PREDICTOR();

666 OUTPUT_PIXEL_PAIR();

667 APPLY_Y_PREDICTOR();

668 OUTPUT_PIXEL_PAIR();

669 }

670 break;

671

672 case 1:

673 case 3:

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

675 APPLY_Y_PREDICTOR();

676 OUTPUT_PIXEL_PAIR();

677 APPLY_Y_PREDICTOR();

678 OUTPUT_PIXEL_PAIR();

679 break;

680

681 case 2:

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

683 * depending on the macroblock type */

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

685 APPLY_C_PREDICTOR();

686 APPLY_Y_PREDICTOR();

687 OUTPUT_PIXEL_PAIR();

688 APPLY_C_PREDICTOR();

689 APPLY_Y_PREDICTOR();

690 OUTPUT_PIXEL_PAIR();

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

692 APPLY_C_PREDICTOR();

693 APPLY_Y_PREDICTOR();

694 OUTPUT_PIXEL_PAIR();

695 APPLY_Y_PREDICTOR();

696 OUTPUT_PIXEL_PAIR();

697 } else {

698 APPLY_Y_PREDICTOR();

699 OUTPUT_PIXEL_PAIR();

700 APPLY_Y_PREDICTOR();

701 OUTPUT_PIXEL_PAIR();

702 }

703 break;

704 }

705

706 } else {

707

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

709 * predictor */

710 *vert_pred++ = *current_pixel_pair++;

711 horiz_pred = *current_pixel_pair - *vert_pred;

712 *vert_pred++ = *current_pixel_pair++;

713

714 }

715

716 if (!keyframe) {

717 mb_change_byte_mask <<= 1;

718

719 /* next byte */

720 if (!mb_change_byte_mask) {

721 mb_change_byte = mb_change_bits[mb_change_index++];

722 mb_change_byte_mask = 0x01;

723 }

724 }

725

726 pixels_left -= 4;

727 }

728

729 /* next change row */

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

731 mb_change_bits += s->mb_change_bits_row_size;

732

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

734 }

735 }

736

737 static void truemotion1_decode_24bit(TrueMotion1Context *s)

738 {

739 int y;

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

741 unsigned int predictor_pair;

742 unsigned int horiz_pred;

743 unsigned int *vert_pred;

744 unsigned int *current_pixel_pair;

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

746 int keyframe = s->flags & FLAG_KEYFRAME;

747

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

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

750 unsigned char mb_change_byte;

751 unsigned char mb_change_byte_mask;

752 int mb_change_index;

753

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

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

756 int index;

757

758 /* clean out the line buffer */

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

760

761 GET_NEXT_INDEX();

762

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

764

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

766 horiz_pred = 0;

767 current_pixel_pair = (unsigned int *)current_line;

768 vert_pred = s->vert_pred;

769 mb_change_index = 0;

770 mb_change_byte = mb_change_bits[mb_change_index++];

771 mb_change_byte_mask = 0x01;

772 pixels_left = s->avctx->width;

773

774 while (pixels_left > 0) {

775

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

777

778 switch (y & 3) {

779 case 0:

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

781 * apply C-Y-Y */

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

783 APPLY_C_PREDICTOR_24();

784 APPLY_Y_PREDICTOR_24();

785 OUTPUT_PIXEL_PAIR();

786 APPLY_C_PREDICTOR_24();

787 APPLY_Y_PREDICTOR_24();

788 OUTPUT_PIXEL_PAIR();

789 } else {

790 APPLY_C_PREDICTOR_24();

791 APPLY_Y_PREDICTOR_24();

792 OUTPUT_PIXEL_PAIR();

793 APPLY_Y_PREDICTOR_24();

794 OUTPUT_PIXEL_PAIR();

795 }

796 break;

797

798 case 1:

799 case 3:

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

801 APPLY_Y_PREDICTOR_24();

802 OUTPUT_PIXEL_PAIR();

803 APPLY_Y_PREDICTOR_24();

804 OUTPUT_PIXEL_PAIR();

805 break;

806

807 case 2:

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

809 * depending on the macroblock type */

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

811 APPLY_C_PREDICTOR_24();

812 APPLY_Y_PREDICTOR_24();

813 OUTPUT_PIXEL_PAIR();

814 APPLY_C_PREDICTOR_24();

815 APPLY_Y_PREDICTOR_24();

816 OUTPUT_PIXEL_PAIR();

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

818 APPLY_C_PREDICTOR_24();

819 APPLY_Y_PREDICTOR_24();

820 OUTPUT_PIXEL_PAIR();

821 APPLY_Y_PREDICTOR_24();

822 OUTPUT_PIXEL_PAIR();

823 } else {

824 APPLY_Y_PREDICTOR_24();

825 OUTPUT_PIXEL_PAIR();

826 APPLY_Y_PREDICTOR_24();

827 OUTPUT_PIXEL_PAIR();

828 }

829 break;

830 }

831

832 } else {

833

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

835 * predictor */

836 *vert_pred++ = *current_pixel_pair++;

837 horiz_pred = *current_pixel_pair - *vert_pred;

838 *vert_pred++ = *current_pixel_pair++;

839

840 }

841

842 if (!keyframe) {

843 mb_change_byte_mask <<= 1;

844

845 /* next byte */

846 if (!mb_change_byte_mask) {

847 mb_change_byte = mb_change_bits[mb_change_index++];

848 mb_change_byte_mask = 0x01;

849 }

850 }

851

852 pixels_left -= 2;

853 }

854

855 /* next change row */

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

857 mb_change_bits += s->mb_change_bits_row_size;

858

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

860 }

861 }

862

863

864 static int truemotion1_decode_frame(AVCodecContext *avctx,

865 void *data, int *got_frame,

866 AVPacket *avpkt)

867 {

868 const uint8_t *buf = avpkt->data;

869 int ret, buf_size = avpkt->size;

870 TrueMotion1Context *s = avctx->priv_data;

871

872 s->buf = buf;

873 s->size = buf_size;

874

875 if ((ret = truemotion1_decode_header(s)) < 0)

876 return ret;

877

878 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)

879 return ret;

880

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

882 truemotion1_decode_24bit(s);

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

884 truemotion1_decode_16bit(s);

885 }

886

887 if ((ret = av_frame_ref(data, s->frame)) < 0)

888 return ret;

889

890 *got_frame = 1;

891

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

893 return buf_size;

894 }

895

896 static av_cold int truemotion1_decode_end(AVCodecContext *avctx)

897 {

898 TrueMotion1Context *s = avctx->priv_data;

899

900 av_frame_free(&s->frame);

901 av_freep(&s->vert_pred);

902

903 return 0;

904 }

905

906 AVCodec ff_truemotion1_decoder = {

907 .name = "truemotion1",

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

909 .type = AVMEDIA_TYPE_VIDEO,

910 .id = AV_CODEC_ID_TRUEMOTION1,

911 .priv_data_size = sizeof(TrueMotion1Context),

912 .init = truemotion1_decode_init,

913 .close = truemotion1_decode_end,

914 .decode = truemotion1_decode_frame,

915 .capabilities = CODEC_CAP_DR1,

916 };

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