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 || header.header_size >= s->size)

321 {

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

323 return AVERROR_INVALIDDATA;

324 }

325

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

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

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

329

330 header.compression = header_buffer[0];

331 header.deltaset = header_buffer[1];

332 header.vectable = header_buffer[2];

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

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

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

336 header.version = header_buffer[9];

337 header.header_type = header_buffer[10];

338 header.flags = header_buffer[11];

339 header.control = header_buffer[12];

340

341 /* Version 2 */

342 if (header.version >= 2)

343 {

344 if (header.header_type > 3)

345 {

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

347 return AVERROR_INVALIDDATA;

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

349 s->flags = header.flags;

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

351 s->flags |= FLAG_KEYFRAME;

352 } else

353 s->flags = FLAG_KEYFRAME;

354 } else /* Version 1 */

355 s->flags = FLAG_KEYFRAME;

356

357 if (s->flags & FLAG_SPRITE) {

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

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

360 return AVERROR_PATCHWELCOME;

361 } else {

362 s->w = header.xsize;

363 s->h = header.ysize;

364 if (header.header_type < 2) {

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

366 {

367 s->flags |= FLAG_INTERPOLATED;

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

369 }

370 }

371 }

372

373 if (header.compression >= 17) {

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

375 return AVERROR_INVALIDDATA;

376 }

377

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

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

380 select_delta_tables(s, header.deltaset);

381

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

383 sel_vector_table = pc_tbl2;

384 else {

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

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

387 else {

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

389 return AVERROR_INVALIDDATA;

390 }

391 }

392

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

394 new_pix_fmt = AV_PIX_FMT_RGB32;

395 width_shift = 1;

396 } else

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

398

399 s->w >>= width_shift;

400 if ((ret = av_image_check_size(s->w, s->h, 0, s->avctx)) < 0)

401 return ret;

402

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

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

405 av_frame_unref(&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

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

474 * predictor is 0 to start with */

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

476

477 return 0;

478 }

479

480 /*

481 Block decoding order:

482

483 dxi: Y-Y

484 dxic: Y-C-Y

485 dxic2: Y-C-Y-C

486

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

488 2x2 0: 0 dxic2

489 2x2 1: 1 dxi

490 2x2 2: 0 dxic2

491 2x2 3: 1 dxi

492 2x4 0: 0 dxic2

493 2x4 1: 1 dxi

494 2x4 2: 2 dxi

495 2x4 3: 3 dxi

496 4x2 0: 0 dxic

497 4x2 1: 1 dxi

498 4x2 2: 0 dxic

499 4x2 3: 1 dxi

500 4x4 0: 0 dxic

501 4x4 1: 1 dxi

502 4x4 2: 2 dxi

503 4x4 3: 3 dxi

504 */

505

506 #define GET_NEXT_INDEX() \

507 {\

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

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

510 return; \

511 } \

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

513 }

514

515 #define APPLY_C_PREDICTOR() \

516 if(index > 1023){\

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

518 return; \

519 }\

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

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

522 if (predictor_pair & 1) { \

523 GET_NEXT_INDEX() \

524 if (!index) { \

525 GET_NEXT_INDEX() \

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

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

528 if (predictor_pair & 1) \

529 GET_NEXT_INDEX() \

530 else \

531 index++; \

532 } \

533 } else \

534 index++;

535

536 #define APPLY_C_PREDICTOR_24() \

537 if(index > 1023){\

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

539 return; \

540 }\

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

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

543 if (predictor_pair & 1) { \

544 GET_NEXT_INDEX() \

545 if (!index) { \

546 GET_NEXT_INDEX() \

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

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

549 if (predictor_pair & 1) \

550 GET_NEXT_INDEX() \

551 else \

552 index++; \

553 } \

554 } else \

555 index++;

556

557

558 #define APPLY_Y_PREDICTOR() \

559 if(index > 1023){\

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

561 return; \

562 }\

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

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

565 if (predictor_pair & 1) { \

566 GET_NEXT_INDEX() \

567 if (!index) { \

568 GET_NEXT_INDEX() \

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

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

571 if (predictor_pair & 1) \

572 GET_NEXT_INDEX() \

573 else \

574 index++; \

575 } \

576 } else \

577 index++;

578

579 #define APPLY_Y_PREDICTOR_24() \

580 if(index > 1023){\

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

582 return; \

583 }\

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

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

586 if (predictor_pair & 1) { \

587 GET_NEXT_INDEX() \

588 if (!index) { \

589 GET_NEXT_INDEX() \

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

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

592 if (predictor_pair & 1) \

593 GET_NEXT_INDEX() \

594 else \

595 index++; \

596 } \

597 } else \

598 index++;

599

600 #define OUTPUT_PIXEL_PAIR() \

601 *current_pixel_pair = *vert_pred + horiz_pred; \

602 *vert_pred++ = *current_pixel_pair++;

603

604 static void truemotion1_decode_16bit(TrueMotion1Context *s)

605 {

606 int y;

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

608 unsigned int predictor_pair;

609 unsigned int horiz_pred;

610 unsigned int *vert_pred;

611 unsigned int *current_pixel_pair;

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

613 int keyframe = s->flags & FLAG_KEYFRAME;

614

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

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

617 unsigned char mb_change_byte;

618 unsigned char mb_change_byte_mask;

619 int mb_change_index;

620

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

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

623 int index;

624

625 /* clean out the line buffer */

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

627

628 GET_NEXT_INDEX();

629

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

631

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

633 horiz_pred = 0;

634 current_pixel_pair = (unsigned int *)current_line;

635 vert_pred = s->vert_pred;

636 mb_change_index = 0;

637 mb_change_byte = mb_change_bits[mb_change_index++];

638 mb_change_byte_mask = 0x01;

639 pixels_left = s->avctx->width;

640

641 while (pixels_left > 0) {

642

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

644

645 switch (y & 3) {

646 case 0:

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

648 * apply C-Y-Y */

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

650 APPLY_C_PREDICTOR();

651 APPLY_Y_PREDICTOR();

652 OUTPUT_PIXEL_PAIR();

653 APPLY_C_PREDICTOR();

654 APPLY_Y_PREDICTOR();

655 OUTPUT_PIXEL_PAIR();

656 } else {

657 APPLY_C_PREDICTOR();

658 APPLY_Y_PREDICTOR();

659 OUTPUT_PIXEL_PAIR();

660 APPLY_Y_PREDICTOR();

661 OUTPUT_PIXEL_PAIR();

662 }

663 break;

664

665 case 1:

666 case 3:

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

668 APPLY_Y_PREDICTOR();

669 OUTPUT_PIXEL_PAIR();

670 APPLY_Y_PREDICTOR();

671 OUTPUT_PIXEL_PAIR();

672 break;

673

674 case 2:

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

676 * depending on the macroblock type */

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

678 APPLY_C_PREDICTOR();

679 APPLY_Y_PREDICTOR();

680 OUTPUT_PIXEL_PAIR();

681 APPLY_C_PREDICTOR();

682 APPLY_Y_PREDICTOR();

683 OUTPUT_PIXEL_PAIR();

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

685 APPLY_C_PREDICTOR();

686 APPLY_Y_PREDICTOR();

687 OUTPUT_PIXEL_PAIR();

688 APPLY_Y_PREDICTOR();

689 OUTPUT_PIXEL_PAIR();

690 } else {

691 APPLY_Y_PREDICTOR();

692 OUTPUT_PIXEL_PAIR();

693 APPLY_Y_PREDICTOR();

694 OUTPUT_PIXEL_PAIR();

695 }

696 break;

697 }

698

699 } else {

700

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

702 * predictor */

703 *vert_pred++ = *current_pixel_pair++;

704 horiz_pred = *current_pixel_pair - *vert_pred;

705 *vert_pred++ = *current_pixel_pair++;

706

707 }

708

709 if (!keyframe) {

710 mb_change_byte_mask <<= 1;

711

712 /* next byte */

713 if (!mb_change_byte_mask) {

714 mb_change_byte = mb_change_bits[mb_change_index++];

715 mb_change_byte_mask = 0x01;

716 }

717 }

718

719 pixels_left -= 4;

720 }

721

722 /* next change row */

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

724 mb_change_bits += s->mb_change_bits_row_size;

725

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

727 }

728 }

729

730 static void truemotion1_decode_24bit(TrueMotion1Context *s)

731 {

732 int y;

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

734 unsigned int predictor_pair;

735 unsigned int horiz_pred;

736 unsigned int *vert_pred;

737 unsigned int *current_pixel_pair;

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

739 int keyframe = s->flags & FLAG_KEYFRAME;

740

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

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

743 unsigned char mb_change_byte;

744 unsigned char mb_change_byte_mask;

745 int mb_change_index;

746

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

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

749 int index;

750

751 /* clean out the line buffer */

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

753

754 GET_NEXT_INDEX();

755

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

757

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

759 horiz_pred = 0;

760 current_pixel_pair = (unsigned int *)current_line;

761 vert_pred = s->vert_pred;

762 mb_change_index = 0;

763 mb_change_byte = mb_change_bits[mb_change_index++];

764 mb_change_byte_mask = 0x01;

765 pixels_left = s->avctx->width;

766

767 while (pixels_left > 0) {

768

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

770

771 switch (y & 3) {

772 case 0:

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

774 * apply C-Y-Y */

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

776 APPLY_C_PREDICTOR_24();

777 APPLY_Y_PREDICTOR_24();

778 OUTPUT_PIXEL_PAIR();

779 APPLY_C_PREDICTOR_24();

780 APPLY_Y_PREDICTOR_24();

781 OUTPUT_PIXEL_PAIR();

782 } else {

783 APPLY_C_PREDICTOR_24();

784 APPLY_Y_PREDICTOR_24();

785 OUTPUT_PIXEL_PAIR();

786 APPLY_Y_PREDICTOR_24();

787 OUTPUT_PIXEL_PAIR();

788 }

789 break;

790

791 case 1:

792 case 3:

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

794 APPLY_Y_PREDICTOR_24();

795 OUTPUT_PIXEL_PAIR();

796 APPLY_Y_PREDICTOR_24();

797 OUTPUT_PIXEL_PAIR();

798 break;

799

800 case 2:

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

802 * depending on the macroblock type */

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

804 APPLY_C_PREDICTOR_24();

805 APPLY_Y_PREDICTOR_24();

806 OUTPUT_PIXEL_PAIR();

807 APPLY_C_PREDICTOR_24();

808 APPLY_Y_PREDICTOR_24();

809 OUTPUT_PIXEL_PAIR();

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

811 APPLY_C_PREDICTOR_24();

812 APPLY_Y_PREDICTOR_24();

813 OUTPUT_PIXEL_PAIR();

814 APPLY_Y_PREDICTOR_24();

815 OUTPUT_PIXEL_PAIR();

816 } else {

817 APPLY_Y_PREDICTOR_24();

818 OUTPUT_PIXEL_PAIR();

819 APPLY_Y_PREDICTOR_24();

820 OUTPUT_PIXEL_PAIR();

821 }

822 break;

823 }

824

825 } else {

826

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

828 * predictor */

829 *vert_pred++ = *current_pixel_pair++;

830 horiz_pred = *current_pixel_pair - *vert_pred;

831 *vert_pred++ = *current_pixel_pair++;

832

833 }

834

835 if (!keyframe) {

836 mb_change_byte_mask <<= 1;

837

838 /* next byte */

839 if (!mb_change_byte_mask) {

840 mb_change_byte = mb_change_bits[mb_change_index++];

841 mb_change_byte_mask = 0x01;

842 }

843 }

844

845 pixels_left -= 2;

846 }

847

848 /* next change row */

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

850 mb_change_bits += s->mb_change_bits_row_size;

851

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

853 }

854 }

855

856

857 static int truemotion1_decode_frame(AVCodecContext *avctx,

858 void *data, int *got_frame,

859 AVPacket *avpkt)

860 {

861 const uint8_t *buf = avpkt->data;

862 int ret, buf_size = avpkt->size;

863 TrueMotion1Context *s = avctx->priv_data;

864

865 s->buf = buf;

866 s->size = buf_size;

867

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

869 return ret;

870

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

872 return ret;

873

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

875 truemotion1_decode_24bit(s);

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

877 truemotion1_decode_16bit(s);

878 }

879

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

881 return ret;

882

883 *got_frame = 1;

884

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

886 return buf_size;

887 }

888

889 static av_cold int truemotion1_decode_end(AVCodecContext *avctx)

890 {

891 TrueMotion1Context *s = avctx->priv_data;

892

893 av_frame_unref(&s->frame);

894 av_free(s->vert_pred);

895

896 return 0;

897 }

898

899 AVCodec ff_truemotion1_decoder = {

900 .name = "truemotion1",

901 .type = AVMEDIA_TYPE_VIDEO,

902 .id = AV_CODEC_ID_TRUEMOTION1,

903 .priv_data_size = sizeof(TrueMotion1Context),

904 .init = truemotion1_decode_init,

905 .close = truemotion1_decode_end,

906 .decode = truemotion1_decode_frame,

907 .capabilities = CODEC_CAP_DR1,

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

909 };

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