FFmpeg: libavcodec/flicvideo.c Source File

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libavcodec

flicvideo.c

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1 /*

2 * FLI/FLC Animation Video 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 * Autodesk Animator FLI/FLC Video Decoder

25 * by Mike Melanson (melanson@pcisys.net)

26 * for more information on the .fli/.flc file format and all of its many

27 * variations, visit:

28 * http://www.compuphase.com/flic.htm

29 *

30 * This decoder outputs PAL8/RGB555/RGB565 and maybe one day RGB24

31 * colorspace data, depending on the FLC. To use this decoder, be

32 * sure that your demuxer sends the FLI file header to the decoder via

33 * the extradata chunk in AVCodecContext. The chunk should be 128 bytes

34 * large. The only exception is for FLI files from the game "Magic Carpet",

35 * in which the header is only 12 bytes.

36 */

38 #include <stdio.h>

39 #include <stdlib.h>

40 #include <string.h>

42 #include "libavutil/intreadwrite.h"

43 #include "avcodec.h"

44 #include "bytestream.h"

45 #include "internal.h"

46 #include "mathops.h"

48 #define FLI_256_COLOR 4

49 #define FLI_DELTA 7

50 #define FLI_COLOR 11

51 #define FLI_LC 12

52 #define FLI_BLACK 13

53 #define FLI_BRUN 15

54 #define FLI_COPY 16

55 #define FLI_MINI 18

56 #define FLI_DTA_BRUN 25

57 #define FLI_DTA_COPY 26

58 #define FLI_DTA_LC 27

60 #define FLI_TYPE_CODE (0xAF11)

61 #define FLC_FLX_TYPE_CODE (0xAF12)

62 #define FLC_DTA_TYPE_CODE (0xAF44) /* Marks an "Extended FLC" comes from Dave's Targa Animator (DTA) */

63 #define FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE (0xAF13)

65 #define CHECK_PIXEL_PTR(n) \

66 if (pixel_ptr + n > pixel_limit) { \

67 av_log (s->avctx, AV_LOG_ERROR, "Invalid pixel_ptr = %d > pixel_limit = %d\n", \

68 pixel_ptr + n, pixel_limit); \

69 return AVERROR_INVALIDDATA; \

70 } \

72 typedef struct FlicDecodeContext {

73 AVCodecContext *avctx;

74 AVFrame *frame;

76 unsigned int palette[256];

77 int new_palette;

78 int fli_type; /* either 0xAF11 or 0xAF12, affects palette resolution */

79 } FlicDecodeContext;

81 static av_cold int flic_decode_init(AVCodecContext *avctx)

82 {

83 FlicDecodeContext *s = avctx->priv_data;

84 unsigned char *fli_header = (unsigned char *)avctx->extradata;

85 int depth;

87 if (avctx->extradata_size != 0 &&

88 avctx->extradata_size != 12 &&

89 avctx->extradata_size != 128 &&

90 avctx->extradata_size != 256 &&

91 avctx->extradata_size != 904 &&

92 avctx->extradata_size != 1024) {

93 av_log(avctx, AV_LOG_ERROR, "Unexpected extradata size %d\n", avctx->extradata_size);

94 return AVERROR_INVALIDDATA;

95 }

97 s->avctx = avctx;

99 if (s->avctx->extradata_size == 12) {

100 /* special case for magic carpet FLIs */

101 s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE;

102 depth = 8;

103 } else if (avctx->extradata_size == 1024) {

104 uint8_t *ptr = avctx->extradata;

105 int i;

106

107 for (i = 0; i < 256; i++) {

108 s->palette[i] = AV_RL32(ptr);

109 ptr += 4;

110 }

111 depth = 8;

112 /* FLI in MOV, see e.g. FFmpeg trac issue #626 */

113 } else if (avctx->extradata_size == 0 ||

114 avctx->extradata_size == 256 ||

115 /* see FFmpeg ticket #1234 */

116 avctx->extradata_size == 904) {

117 s->fli_type = FLI_TYPE_CODE;

118 depth = 8;

119 } else {

120 s->fli_type = AV_RL16(&fli_header[4]);

121 depth = AV_RL16(&fli_header[12]);

122 }

123

124 if (depth == 0) {

125 depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */

126 }

127

128 if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {

129 depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */

130 }

131

132 switch (depth) {

133 case 8 : avctx->pix_fmt = AV_PIX_FMT_PAL8; break;

134 case 15 : avctx->pix_fmt = AV_PIX_FMT_RGB555; break;

135 case 16 : avctx->pix_fmt = AV_PIX_FMT_RGB565; break;

136 case 24 : avctx->pix_fmt = AV_PIX_FMT_BGR24; /* Supposedly BGR, but havent any files to test with */

137 avpriv_request_sample(avctx, "24Bpp FLC/FLX");

138 return AVERROR_PATCHWELCOME;

139 default :

140 av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);

141 return AVERROR_INVALIDDATA;

142 }

143

144 s->frame = av_frame_alloc();

145 if (!s->frame)

146 return AVERROR(ENOMEM);

147

148 s->new_palette = 0;

149

150 return 0;

151 }

152

153 static int flic_decode_frame_8BPP(AVCodecContext *avctx,

154 void *data, int *got_frame,

155 const uint8_t *buf, int buf_size)

156 {

157 FlicDecodeContext *s = avctx->priv_data;

158

159 GetByteContext g2;

160 int pixel_ptr;

161 int palette_ptr;

162 unsigned char palette_idx1;

163 unsigned char palette_idx2;

164

165 unsigned int frame_size;

166 int num_chunks;

167

168 unsigned int chunk_size;

169 int chunk_type;

170

171 int i, j, ret;

172

173 int color_packets;

174 int color_changes;

175 int color_shift;

176 unsigned char r, g, b;

177

178 int lines;

179 int compressed_lines;

180 int starting_line;

181 signed short line_packets;

182 int y_ptr;

183 int byte_run;

184 int pixel_skip;

185 int pixel_countdown;

186 unsigned char *pixels;

187 unsigned int pixel_limit;

188

189 bytestream2_init(&g2, buf, buf_size);

190

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

192 return ret;

193

194 pixels = s->frame->data[0];

195 pixel_limit = s->avctx->height * s->frame->linesize[0];

196 if (buf_size < 16 || buf_size > INT_MAX - (3 * 256 + FF_INPUT_BUFFER_PADDING_SIZE))

197 return AVERROR_INVALIDDATA;

198 frame_size = bytestream2_get_le32(&g2);

199 if (frame_size > buf_size)

200 frame_size = buf_size;

201 bytestream2_skip(&g2, 2); /* skip the magic number */

202 num_chunks = bytestream2_get_le16(&g2);

203 bytestream2_skip(&g2, 8); /* skip padding */

204

205 frame_size -= 16;

206

207 /* iterate through the chunks */

208 while ((frame_size >= 6) && (num_chunks > 0) &&

209 bytestream2_get_bytes_left(&g2) >= 4) {

210 int stream_ptr_after_chunk;

211 chunk_size = bytestream2_get_le32(&g2);

212 if (chunk_size > frame_size) {

213 av_log(avctx, AV_LOG_WARNING,

214 "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);

215 chunk_size = frame_size;

216 }

217 stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;

218

219 chunk_type = bytestream2_get_le16(&g2);

220

221 switch (chunk_type) {

222 case FLI_256_COLOR:

223 case FLI_COLOR:

224 /* check special case: If this file is from the Magic Carpet

225 * game and uses 6-bit colors even though it reports 256-color

226 * chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during

227 * initialization) */

228 if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))

229 color_shift = 0;

230 else

231 color_shift = 2;

232 /* set up the palette */

233 color_packets = bytestream2_get_le16(&g2);

234 palette_ptr = 0;

235 for (i = 0; i < color_packets; i++) {

236 /* first byte is how many colors to skip */

237 palette_ptr += bytestream2_get_byte(&g2);

238

239 /* next byte indicates how many entries to change */

240 color_changes = bytestream2_get_byte(&g2);

241

242 /* if there are 0 color changes, there are actually 256 */

243 if (color_changes == 0)

244 color_changes = 256;

245

246 if (bytestream2_tell(&g2) + color_changes * 3 > stream_ptr_after_chunk)

247 break;

248

249 for (j = 0; j < color_changes; j++) {

250 unsigned int entry;

251

252 /* wrap around, for good measure */

253 if ((unsigned)palette_ptr >= 256)

254 palette_ptr = 0;

255

256 r = bytestream2_get_byte(&g2) << color_shift;

257 g = bytestream2_get_byte(&g2) << color_shift;

258 b = bytestream2_get_byte(&g2) << color_shift;

259 entry = 0xFFU << 24 | r << 16 | g << 8 | b;

260 if (color_shift == 2)

261 entry |= entry >> 6 & 0x30303;

262 if (s->palette[palette_ptr] != entry)

263 s->new_palette = 1;

264 s->palette[palette_ptr++] = entry;

265 }

266 }

267 break;

268

269 case FLI_DELTA:

270 y_ptr = 0;

271 compressed_lines = bytestream2_get_le16(&g2);

272 while (compressed_lines > 0) {

273 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)

274 break;

275 line_packets = bytestream2_get_le16(&g2);

276 if ((line_packets & 0xC000) == 0xC000) {

277 // line skip opcode

278 line_packets = -line_packets;

279 y_ptr += line_packets * s->frame->linesize[0];

280 } else if ((line_packets & 0xC000) == 0x4000) {

281 av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets);

282 } else if ((line_packets & 0xC000) == 0x8000) {

283 // "last byte" opcode

284 pixel_ptr= y_ptr + s->frame->linesize[0] - 1;

285 CHECK_PIXEL_PTR(0);

286 pixels[pixel_ptr] = line_packets & 0xff;

287 } else {

288 compressed_lines--;

289 pixel_ptr = y_ptr;

290 CHECK_PIXEL_PTR(0);

291 pixel_countdown = s->avctx->width;

292 for (i = 0; i < line_packets; i++) {

293 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)

294 break;

295 /* account for the skip bytes */

296 pixel_skip = bytestream2_get_byte(&g2);

297 pixel_ptr += pixel_skip;

298 pixel_countdown -= pixel_skip;

299 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);

300 if (byte_run < 0) {

301 byte_run = -byte_run;

302 palette_idx1 = bytestream2_get_byte(&g2);

303 palette_idx2 = bytestream2_get_byte(&g2);

304 CHECK_PIXEL_PTR(byte_run * 2);

305 for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {

306 pixels[pixel_ptr++] = palette_idx1;

307 pixels[pixel_ptr++] = palette_idx2;

308 }

309 } else {

310 CHECK_PIXEL_PTR(byte_run * 2);

311 if (bytestream2_tell(&g2) + byte_run * 2 > stream_ptr_after_chunk)

312 break;

313 for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {

314 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);

315 }

316 }

317 }

318

319 y_ptr += s->frame->linesize[0];

320 }

321 }

322 break;

323

324 case FLI_LC:

325 /* line compressed */

326 starting_line = bytestream2_get_le16(&g2);

327 y_ptr = 0;

328 y_ptr += starting_line * s->frame->linesize[0];

329

330 compressed_lines = bytestream2_get_le16(&g2);

331 while (compressed_lines > 0) {

332 pixel_ptr = y_ptr;

333 CHECK_PIXEL_PTR(0);

334 pixel_countdown = s->avctx->width;

335 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)

336 break;

337 line_packets = bytestream2_get_byte(&g2);

338 if (line_packets > 0) {

339 for (i = 0; i < line_packets; i++) {

340 /* account for the skip bytes */

341 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)

342 break;

343 pixel_skip = bytestream2_get_byte(&g2);

344 pixel_ptr += pixel_skip;

345 pixel_countdown -= pixel_skip;

346 byte_run = sign_extend(bytestream2_get_byte(&g2),8);

347 if (byte_run > 0) {

348 CHECK_PIXEL_PTR(byte_run);

349 if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)

350 break;

351 for (j = 0; j < byte_run; j++, pixel_countdown--) {

352 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);

353 }

354 } else if (byte_run < 0) {

355 byte_run = -byte_run;

356 palette_idx1 = bytestream2_get_byte(&g2);

357 CHECK_PIXEL_PTR(byte_run);

358 for (j = 0; j < byte_run; j++, pixel_countdown--) {

359 pixels[pixel_ptr++] = palette_idx1;

360 }

361 }

362 }

363 }

364

365 y_ptr += s->frame->linesize[0];

366 compressed_lines--;

367 }

368 break;

369

370 case FLI_BLACK:

371 /* set the whole frame to color 0 (which is usually black) */

372 memset(pixels, 0,

373 s->frame->linesize[0] * s->avctx->height);

374 break;

375

376 case FLI_BRUN:

377 /* Byte run compression: This chunk type only occurs in the first

378 * FLI frame and it will update the entire frame. */

379 y_ptr = 0;

380 for (lines = 0; lines < s->avctx->height; lines++) {

381 pixel_ptr = y_ptr;

382 /* disregard the line packets; instead, iterate through all

383 * pixels on a row */

384 bytestream2_skip(&g2, 1);

385 pixel_countdown = s->avctx->width;

386 while (pixel_countdown > 0) {

387 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)

388 break;

389 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);

390 if (!byte_run) {

391 av_log(avctx, AV_LOG_ERROR, "Invalid byte run value.\n");

392 return AVERROR_INVALIDDATA;

393 }

394

395 if (byte_run > 0) {

396 palette_idx1 = bytestream2_get_byte(&g2);

397 CHECK_PIXEL_PTR(byte_run);

398 for (j = 0; j < byte_run; j++) {

399 pixels[pixel_ptr++] = palette_idx1;

400 pixel_countdown--;

401 if (pixel_countdown < 0)

402 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",

403 pixel_countdown, lines);

404 }

405 } else { /* copy bytes if byte_run < 0 */

406 byte_run = -byte_run;

407 CHECK_PIXEL_PTR(byte_run);

408 if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)

409 break;

410 for (j = 0; j < byte_run; j++) {

411 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);

412 pixel_countdown--;

413 if (pixel_countdown < 0)

414 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",

415 pixel_countdown, lines);

416 }

417 }

418 }

419

420 y_ptr += s->frame->linesize[0];

421 }

422 break;

423

424 case FLI_COPY:

425 /* copy the chunk (uncompressed frame) */

426 if (chunk_size - 6 != s->avctx->width * s->avctx->height) {

427 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \

428 "has incorrect size, skipping chunk\n", chunk_size - 6);

429 bytestream2_skip(&g2, chunk_size - 6);

430 } else {

431 for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height;

432 y_ptr += s->frame->linesize[0]) {

433 bytestream2_get_buffer(&g2, &pixels[y_ptr],

434 s->avctx->width);

435 }

436 }

437 break;

438

439 case FLI_MINI:

440 /* some sort of a thumbnail? disregard this chunk... */

441 break;

442

443 default:

444 av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);

445 break;

446 }

447

448 if (stream_ptr_after_chunk - bytestream2_tell(&g2) > 0)

449 bytestream2_skip(&g2, stream_ptr_after_chunk - bytestream2_tell(&g2));

450

451 frame_size -= chunk_size;

452 num_chunks--;

453 }

454

455 /* by the end of the chunk, the stream ptr should equal the frame

456 * size (minus 1 or 2, possibly); if it doesn't, issue a warning */

457 if (bytestream2_get_bytes_left(&g2) > 2)

458 av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \

459 "and final chunk ptr = %d\n", buf_size,

460 buf_size - bytestream2_get_bytes_left(&g2));

461

462 /* make the palette available on the way out */

463 memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);

464 if (s->new_palette) {

465 s->frame->palette_has_changed = 1;

466 s->new_palette = 0;

467 }

468

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

470 return ret;

471

472 *got_frame = 1;

473

474 return buf_size;

475 }

476

477 static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,

478 void *data, int *got_frame,

479 const uint8_t *buf, int buf_size)

480 {

481 /* Note, the only difference between the 15Bpp and 16Bpp */

482 /* Format is the pixel format, the packets are processed the same. */

483 FlicDecodeContext *s = avctx->priv_data;

484

485 GetByteContext g2;

486 int pixel_ptr;

487 unsigned char palette_idx1;

488

489 unsigned int frame_size;

490 int num_chunks;

491

492 unsigned int chunk_size;

493 int chunk_type;

494

495 int i, j, ret;

496

497 int lines;

498 int compressed_lines;

499 signed short line_packets;

500 int y_ptr;

501 int byte_run;

502 int pixel_skip;

503 int pixel_countdown;

504 unsigned char *pixels;

505 int pixel;

506 unsigned int pixel_limit;

507

508 bytestream2_init(&g2, buf, buf_size);

509

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

511 return ret;

512

513 pixels = s->frame->data[0];

514 pixel_limit = s->avctx->height * s->frame->linesize[0];

515

516 frame_size = bytestream2_get_le32(&g2);

517 bytestream2_skip(&g2, 2); /* skip the magic number */

518 num_chunks = bytestream2_get_le16(&g2);

519 bytestream2_skip(&g2, 8); /* skip padding */

520 if (frame_size > buf_size)

521 frame_size = buf_size;

522

523 frame_size -= 16;

524

525 /* iterate through the chunks */

526 while ((frame_size > 0) && (num_chunks > 0) &&

527 bytestream2_get_bytes_left(&g2) >= 4) {

528 int stream_ptr_after_chunk;

529 chunk_size = bytestream2_get_le32(&g2);

530 if (chunk_size > frame_size) {

531 av_log(avctx, AV_LOG_WARNING,

532 "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);

533 chunk_size = frame_size;

534 }

535 stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;

536

537 chunk_type = bytestream2_get_le16(&g2);

538

539

540 switch (chunk_type) {

541 case FLI_256_COLOR:

542 case FLI_COLOR:

543 /* For some reason, it seems that non-palettized flics do

544 * include one of these chunks in their first frame.

545 * Why I do not know, it seems rather extraneous. */

546 av_dlog(avctx,

547 "Unexpected Palette chunk %d in non-palettized FLC\n",

548 chunk_type);

549 bytestream2_skip(&g2, chunk_size - 6);

550 break;

551

552 case FLI_DELTA:

553 case FLI_DTA_LC:

554 y_ptr = 0;

555 compressed_lines = bytestream2_get_le16(&g2);

556 while (compressed_lines > 0) {

557 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)

558 break;

559 line_packets = bytestream2_get_le16(&g2);

560 if (line_packets < 0) {

561 line_packets = -line_packets;

562 y_ptr += line_packets * s->frame->linesize[0];

563 } else {

564 compressed_lines--;

565 pixel_ptr = y_ptr;

566 CHECK_PIXEL_PTR(0);

567 pixel_countdown = s->avctx->width;

568 for (i = 0; i < line_packets; i++) {

569 /* account for the skip bytes */

570 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)

571 break;

572 pixel_skip = bytestream2_get_byte(&g2);

573 pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */

574 pixel_countdown -= pixel_skip;

575 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);

576 if (byte_run < 0) {

577 byte_run = -byte_run;

578 pixel = bytestream2_get_le16(&g2);

579 CHECK_PIXEL_PTR(2 * byte_run);

580 for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {

581 *((signed short*)(&pixels[pixel_ptr])) = pixel;

582 pixel_ptr += 2;

583 }

584 } else {

585 if (bytestream2_tell(&g2) + 2*byte_run > stream_ptr_after_chunk)

586 break;

587 CHECK_PIXEL_PTR(2 * byte_run);

588 for (j = 0; j < byte_run; j++, pixel_countdown--) {

589 *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);

590 pixel_ptr += 2;

591 }

592 }

593 }

594

595 y_ptr += s->frame->linesize[0];

596 }

597 }

598 break;

599

600 case FLI_LC:

601 av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-palettized FLC\n");

602 bytestream2_skip(&g2, chunk_size - 6);

603 break;

604

605 case FLI_BLACK:

606 /* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */

607 memset(pixels, 0x0000,

608 s->frame->linesize[0] * s->avctx->height);

609 break;

610

611 case FLI_BRUN:

612 y_ptr = 0;

613 for (lines = 0; lines < s->avctx->height; lines++) {

614 pixel_ptr = y_ptr;

615 /* disregard the line packets; instead, iterate through all

616 * pixels on a row */

617 bytestream2_skip(&g2, 1);

618 pixel_countdown = (s->avctx->width * 2);

619

620 while (pixel_countdown > 0) {

621 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)

622 break;

623 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);

624 if (byte_run > 0) {

625 palette_idx1 = bytestream2_get_byte(&g2);

626 CHECK_PIXEL_PTR(byte_run);

627 for (j = 0; j < byte_run; j++) {

628 pixels[pixel_ptr++] = palette_idx1;

629 pixel_countdown--;

630 if (pixel_countdown < 0)

631 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",

632 pixel_countdown, lines);

633 }

634 } else { /* copy bytes if byte_run < 0 */

635 byte_run = -byte_run;

636 if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)

637 break;

638 CHECK_PIXEL_PTR(byte_run);

639 for (j = 0; j < byte_run; j++) {

640 palette_idx1 = bytestream2_get_byte(&g2);

641 pixels[pixel_ptr++] = palette_idx1;

642 pixel_countdown--;

643 if (pixel_countdown < 0)

644 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",

645 pixel_countdown, lines);

646 }

647 }

648 }

649

650 /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.

651 * This does not give us any good opportunity to perform word endian conversion

652 * during decompression. So if it is required (i.e., this is not a LE target, we do

653 * a second pass over the line here, swapping the bytes.

654 */

655 #if HAVE_BIGENDIAN

656 pixel_ptr = y_ptr;

657 pixel_countdown = s->avctx->width;

658 while (pixel_countdown > 0) {

659 *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[pixel_ptr]);

660 pixel_ptr += 2;

661 }

662 #endif

663 y_ptr += s->frame->linesize[0];

664 }

665 break;

666

667 case FLI_DTA_BRUN:

668 y_ptr = 0;

669 for (lines = 0; lines < s->avctx->height; lines++) {

670 pixel_ptr = y_ptr;

671 /* disregard the line packets; instead, iterate through all

672 * pixels on a row */

673 bytestream2_skip(&g2, 1);

674 pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */

675

676 while (pixel_countdown > 0) {

677 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)

678 break;

679 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);

680 if (byte_run > 0) {

681 pixel = bytestream2_get_le16(&g2);

682 CHECK_PIXEL_PTR(2 * byte_run);

683 for (j = 0; j < byte_run; j++) {

684 *((signed short*)(&pixels[pixel_ptr])) = pixel;

685 pixel_ptr += 2;

686 pixel_countdown--;

687 if (pixel_countdown < 0)

688 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",

689 pixel_countdown);

690 }

691 } else { /* copy pixels if byte_run < 0 */

692 byte_run = -byte_run;

693 if (bytestream2_tell(&g2) + 2 * byte_run > stream_ptr_after_chunk)

694 break;

695 CHECK_PIXEL_PTR(2 * byte_run);

696 for (j = 0; j < byte_run; j++) {

697 *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);

698 pixel_ptr += 2;

699 pixel_countdown--;

700 if (pixel_countdown < 0)

701 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",

702 pixel_countdown);

703 }

704 }

705 }

706

707 y_ptr += s->frame->linesize[0];

708 }

709 break;

710

711 case FLI_COPY:

712 case FLI_DTA_COPY:

713 /* copy the chunk (uncompressed frame) */

714 if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) {

715 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \

716 "bigger than image, skipping chunk\n", chunk_size - 6);

717 bytestream2_skip(&g2, chunk_size - 6);

718 } else {

719

720 for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height;

721 y_ptr += s->frame->linesize[0]) {

722

723 pixel_countdown = s->avctx->width;

724 pixel_ptr = 0;

725 while (pixel_countdown > 0) {

726 *((signed short*)(&pixels[y_ptr + pixel_ptr])) = bytestream2_get_le16(&g2);

727 pixel_ptr += 2;

728 pixel_countdown--;

729 }

730 }

731 }

732 break;

733

734 case FLI_MINI:

735 /* some sort of a thumbnail? disregard this chunk... */

736 bytestream2_skip(&g2, chunk_size - 6);

737 break;

738

739 default:

740 av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);

741 break;

742 }

743

744 frame_size -= chunk_size;

745 num_chunks--;

746 }

747

748 /* by the end of the chunk, the stream ptr should equal the frame

749 * size (minus 1, possibly); if it doesn't, issue a warning */

750 if ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1))

751 av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \

752 "and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2));

753

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

755 return ret;

756

757 *got_frame = 1;

758

759 return buf_size;

760 }

761

762 static int flic_decode_frame_24BPP(AVCodecContext *avctx,

763 void *data, int *got_frame,

764 const uint8_t *buf, int buf_size)

765 {

766 av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");

767 return AVERROR_PATCHWELCOME;

768 }

769

770 static int flic_decode_frame(AVCodecContext *avctx,

771 void *data, int *got_frame,

772 AVPacket *avpkt)

773 {

774 const uint8_t *buf = avpkt->data;

775 int buf_size = avpkt->size;

776 if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {

777 return flic_decode_frame_8BPP(avctx, data, got_frame,

778 buf, buf_size);

779 }

780 else if ((avctx->pix_fmt == AV_PIX_FMT_RGB555) ||

781 (avctx->pix_fmt == AV_PIX_FMT_RGB565)) {

782 return flic_decode_frame_15_16BPP(avctx, data, got_frame,

783 buf, buf_size);

784 }

785 else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {

786 return flic_decode_frame_24BPP(avctx, data, got_frame,

787 buf, buf_size);

788 }

789

790 /* Should not get here, ever as the pix_fmt is processed */

791 /* in flic_decode_init and the above if should deal with */

792 /* the finite set of possibilites allowable by here. */

793 /* But in case we do, just error out. */

794 av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n");

795 return AVERROR_BUG;

796 }

797

798

799 static av_cold int flic_decode_end(AVCodecContext *avctx)

800 {

801 FlicDecodeContext *s = avctx->priv_data;

802

803 av_frame_free(&s->frame);

804

805 return 0;

806 }

807

808 AVCodec ff_flic_decoder = {

809 .name = "flic",

810 .long_name = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"),

811 .type = AVMEDIA_TYPE_VIDEO,

812 .id = AV_CODEC_ID_FLIC,

813 .priv_data_size = sizeof(FlicDecodeContext),

814 .init = flic_decode_init,

815 .close = flic_decode_end,

816 .decode = flic_decode_frame,

817 .capabilities = CODEC_CAP_DR1,

818 };

Generated on Sun Jul 20 2014 23:05:47 for FFmpeg by doxygen 1.8.2