FFmpeg: libavcodec/qtrle.c Source File

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libavcodec

qtrle.c

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1 /*

2 * Quicktime Animation (RLE) 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 * QT RLE Video Decoder by Mike Melanson (melanson@pcisys.net)

25 * For more information about the QT RLE format, visit:

26 * http://www.pcisys.net/~melanson/codecs/

27 *

28 * The QT RLE decoder has seven modes of operation:

29 * 1, 2, 4, 8, 16, 24, and 32 bits per pixel. For modes 1, 2, 4, and 8

30 * the decoder outputs PAL8 colorspace data. 16-bit data yields RGB555

31 * data. 24-bit data is RGB24 and 32-bit data is RGB32.

32 */

34 #include <stdio.h>

35 #include <stdlib.h>

36 #include <string.h>

38 #include "avcodec.h"

39 #include "bytestream.h"

40 #include "internal.h"

42 typedef struct QtrleContext {

43 AVCodecContext *avctx;

44 AVFrame *frame;

46 GetByteContext g;

47 uint32_t pal[256];

48 } QtrleContext;

50 #define CHECK_PIXEL_PTR(n) \

51 if ((pixel_ptr + n > pixel_limit) || (pixel_ptr + n < 0)) { \

52 av_log (s->avctx, AV_LOG_ERROR, "Problem: pixel_ptr = %d, pixel_limit = %d\n",\

53 pixel_ptr + n, pixel_limit); \

54 return; \

55 } \

57 static void qtrle_decode_1bpp(QtrleContext *s, int row_ptr, int lines_to_change)

58 {

59 int rle_code;

60 int pixel_ptr;

61 int row_inc = s->frame->linesize[0];

62 uint8_t pi0, pi1; /* 2 8-pixel values */

63 uint8_t *rgb = s->frame->data[0];

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

65 int skip;

66 /* skip & 0x80 appears to mean 'start a new line', which can be interpreted

67 * as 'go to next line' during the decoding of a frame but is 'go to first

68 * line' at the beginning. Since we always interpret it as 'go to next line'

69 * in the decoding loop (which makes code simpler/faster), the first line

70 * would not be counted, so we count one more.

71 * See: https://trac.ffmpeg.org/ticket/226

72 * In the following decoding loop, row_ptr will be the position of the

73 * current row. */

75 row_ptr -= row_inc;

76 pixel_ptr = row_ptr;

77 lines_to_change++;

78 while (lines_to_change) {

79 skip = bytestream2_get_byte(&s->g);

80 rle_code = (int8_t)bytestream2_get_byte(&s->g);

81 if (rle_code == 0)

82 break;

83 if(skip & 0x80) {

84 lines_to_change--;

85 row_ptr += row_inc;

86 pixel_ptr = row_ptr + 2 * 8 * (skip & 0x7f);

87 } else

88 pixel_ptr += 2 * 8 * skip;

89 CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */

91 if(rle_code == -1)

92 continue;

94 if (rle_code < 0) {

95 /* decode the run length code */

96 rle_code = -rle_code;

97 /* get the next 2 bytes from the stream, treat them as groups

98 * of 8 pixels, and output them rle_code times */

100 pi0 = bytestream2_get_byte(&s->g);

101 pi1 = bytestream2_get_byte(&s->g);

102 CHECK_PIXEL_PTR(rle_code * 2 * 8);

103

104 while (rle_code--) {

105 rgb[pixel_ptr++] = (pi0 >> 7) & 0x01;

106 rgb[pixel_ptr++] = (pi0 >> 6) & 0x01;

107 rgb[pixel_ptr++] = (pi0 >> 5) & 0x01;

108 rgb[pixel_ptr++] = (pi0 >> 4) & 0x01;

109 rgb[pixel_ptr++] = (pi0 >> 3) & 0x01;

110 rgb[pixel_ptr++] = (pi0 >> 2) & 0x01;

111 rgb[pixel_ptr++] = (pi0 >> 1) & 0x01;

112 rgb[pixel_ptr++] = pi0 & 0x01;

113 rgb[pixel_ptr++] = (pi1 >> 7) & 0x01;

114 rgb[pixel_ptr++] = (pi1 >> 6) & 0x01;

115 rgb[pixel_ptr++] = (pi1 >> 5) & 0x01;

116 rgb[pixel_ptr++] = (pi1 >> 4) & 0x01;

117 rgb[pixel_ptr++] = (pi1 >> 3) & 0x01;

118 rgb[pixel_ptr++] = (pi1 >> 2) & 0x01;

119 rgb[pixel_ptr++] = (pi1 >> 1) & 0x01;

120 rgb[pixel_ptr++] = pi1 & 0x01;

121 }

122 } else {

123 /* copy the same pixel directly to output 2 times */

124 rle_code *= 2;

125 CHECK_PIXEL_PTR(rle_code * 8);

126

127 while (rle_code--) {

128 int x = bytestream2_get_byte(&s->g);

129 rgb[pixel_ptr++] = (x >> 7) & 0x01;

130 rgb[pixel_ptr++] = (x >> 6) & 0x01;

131 rgb[pixel_ptr++] = (x >> 5) & 0x01;

132 rgb[pixel_ptr++] = (x >> 4) & 0x01;

133 rgb[pixel_ptr++] = (x >> 3) & 0x01;

134 rgb[pixel_ptr++] = (x >> 2) & 0x01;

135 rgb[pixel_ptr++] = (x >> 1) & 0x01;

136 rgb[pixel_ptr++] = x & 0x01;

137 }

138 }

139 }

140 }

141

142 static inline void qtrle_decode_2n4bpp(QtrleContext *s, int row_ptr,

143 int lines_to_change, int bpp)

144 {

145 int rle_code, i;

146 int pixel_ptr;

147 int row_inc = s->frame->linesize[0];

148 uint8_t pi[16]; /* 16 palette indices */

149 uint8_t *rgb = s->frame->data[0];

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

151 int num_pixels = (bpp == 4) ? 8 : 16;

152

153 while (lines_to_change--) {

154 pixel_ptr = row_ptr + (num_pixels * (bytestream2_get_byte(&s->g) - 1));

155 CHECK_PIXEL_PTR(0);

156

157 while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {

158 if (rle_code == 0) {

159 /* there's another skip code in the stream */

160 pixel_ptr += (num_pixels * (bytestream2_get_byte(&s->g) - 1));

161 CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */

162 } else if (rle_code < 0) {

163 /* decode the run length code */

164 rle_code = -rle_code;

165 /* get the next 4 bytes from the stream, treat them as palette

166 * indexes, and output them rle_code times */

167 for (i = num_pixels-1; i >= 0; i--) {

168 pi[num_pixels-1-i] = (bytestream2_peek_byte(&s->g) >> ((i*bpp) & 0x07)) & ((1<<bpp)-1);

169 bytestream2_skip(&s->g, ((i & ((num_pixels>>2)-1)) == 0));

170 }

171 CHECK_PIXEL_PTR(rle_code * num_pixels);

172 while (rle_code--) {

173 memcpy(&rgb[pixel_ptr], &pi, num_pixels);

174 pixel_ptr += num_pixels;

175 }

176 } else {

177 /* copy the same pixel directly to output 4 times */

178 rle_code *= 4;

179 CHECK_PIXEL_PTR(rle_code*(num_pixels>>2));

180 while (rle_code--) {

181 if(bpp == 4) {

182 int x = bytestream2_get_byte(&s->g);

183 rgb[pixel_ptr++] = (x >> 4) & 0x0f;

184 rgb[pixel_ptr++] = x & 0x0f;

185 } else {

186 int x = bytestream2_get_byte(&s->g);

187 rgb[pixel_ptr++] = (x >> 6) & 0x03;

188 rgb[pixel_ptr++] = (x >> 4) & 0x03;

189 rgb[pixel_ptr++] = (x >> 2) & 0x03;

190 rgb[pixel_ptr++] = x & 0x03;

191 }

192 }

193 }

194 }

195 row_ptr += row_inc;

196 }

197 }

198

199 static void qtrle_decode_8bpp(QtrleContext *s, int row_ptr, int lines_to_change)

200 {

201 int rle_code;

202 int pixel_ptr;

203 int row_inc = s->frame->linesize[0];

204 uint8_t pi1, pi2, pi3, pi4; /* 4 palette indexes */

205 uint8_t *rgb = s->frame->data[0];

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

207

208 while (lines_to_change--) {

209 pixel_ptr = row_ptr + (4 * (bytestream2_get_byte(&s->g) - 1));

210 CHECK_PIXEL_PTR(0);

211

212 while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {

213 if (rle_code == 0) {

214 /* there's another skip code in the stream */

215 pixel_ptr += (4 * (bytestream2_get_byte(&s->g) - 1));

216 CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */

217 } else if (rle_code < 0) {

218 /* decode the run length code */

219 rle_code = -rle_code;

220 /* get the next 4 bytes from the stream, treat them as palette

221 * indexes, and output them rle_code times */

222 pi1 = bytestream2_get_byte(&s->g);

223 pi2 = bytestream2_get_byte(&s->g);

224 pi3 = bytestream2_get_byte(&s->g);

225 pi4 = bytestream2_get_byte(&s->g);

226

227 CHECK_PIXEL_PTR(rle_code * 4);

228

229 while (rle_code--) {

230 rgb[pixel_ptr++] = pi1;

231 rgb[pixel_ptr++] = pi2;

232 rgb[pixel_ptr++] = pi3;

233 rgb[pixel_ptr++] = pi4;

234 }

235 } else {

236 /* copy the same pixel directly to output 4 times */

237 rle_code *= 4;

238 CHECK_PIXEL_PTR(rle_code);

239

240 bytestream2_get_buffer(&s->g, &rgb[pixel_ptr], rle_code);

241 pixel_ptr += rle_code;

242 }

243 }

244 row_ptr += row_inc;

245 }

246 }

247

248 static void qtrle_decode_16bpp(QtrleContext *s, int row_ptr, int lines_to_change)

249 {

250 int rle_code;

251 int pixel_ptr;

252 int row_inc = s->frame->linesize[0];

253 uint16_t rgb16;

254 uint8_t *rgb = s->frame->data[0];

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

256

257 while (lines_to_change--) {

258 pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 2;

259 CHECK_PIXEL_PTR(0);

260

261 while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {

262 if (rle_code == 0) {

263 /* there's another skip code in the stream */

264 pixel_ptr += (bytestream2_get_byte(&s->g) - 1) * 2;

265 CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */

266 } else if (rle_code < 0) {

267 /* decode the run length code */

268 rle_code = -rle_code;

269 rgb16 = bytestream2_get_be16(&s->g);

270

271 CHECK_PIXEL_PTR(rle_code * 2);

272

273 while (rle_code--) {

274 *(uint16_t *)(&rgb[pixel_ptr]) = rgb16;

275 pixel_ptr += 2;

276 }

277 } else {

278 CHECK_PIXEL_PTR(rle_code * 2);

279

280 /* copy pixels directly to output */

281 while (rle_code--) {

282 rgb16 = bytestream2_get_be16(&s->g);

283 *(uint16_t *)(&rgb[pixel_ptr]) = rgb16;

284 pixel_ptr += 2;

285 }

286 }

287 }

288 row_ptr += row_inc;

289 }

290 }

291

292 static void qtrle_decode_24bpp(QtrleContext *s, int row_ptr, int lines_to_change)

293 {

294 int rle_code;

295 int pixel_ptr;

296 int row_inc = s->frame->linesize[0];

297 uint8_t r, g, b;

298 uint8_t *rgb = s->frame->data[0];

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

300

301 while (lines_to_change--) {

302 pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 3;

303 CHECK_PIXEL_PTR(0);

304

305 while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {

306 if (rle_code == 0) {

307 /* there's another skip code in the stream */

308 pixel_ptr += (bytestream2_get_byte(&s->g) - 1) * 3;

309 CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */

310 } else if (rle_code < 0) {

311 /* decode the run length code */

312 rle_code = -rle_code;

313 r = bytestream2_get_byte(&s->g);

314 g = bytestream2_get_byte(&s->g);

315 b = bytestream2_get_byte(&s->g);

316

317 CHECK_PIXEL_PTR(rle_code * 3);

318

319 while (rle_code--) {

320 rgb[pixel_ptr++] = r;

321 rgb[pixel_ptr++] = g;

322 rgb[pixel_ptr++] = b;

323 }

324 } else {

325 CHECK_PIXEL_PTR(rle_code * 3);

326

327 /* copy pixels directly to output */

328 while (rle_code--) {

329 rgb[pixel_ptr++] = bytestream2_get_byte(&s->g);

330 rgb[pixel_ptr++] = bytestream2_get_byte(&s->g);

331 rgb[pixel_ptr++] = bytestream2_get_byte(&s->g);

332 }

333 }

334 }

335 row_ptr += row_inc;

336 }

337 }

338

339 static void qtrle_decode_32bpp(QtrleContext *s, int row_ptr, int lines_to_change)

340 {

341 int rle_code;

342 int pixel_ptr;

343 int row_inc = s->frame->linesize[0];

344 unsigned int argb;

345 uint8_t *rgb = s->frame->data[0];

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

347

348 while (lines_to_change--) {

349 pixel_ptr = row_ptr + (bytestream2_get_byte(&s->g) - 1) * 4;

350 CHECK_PIXEL_PTR(0);

351

352 while ((rle_code = (int8_t)bytestream2_get_byte(&s->g)) != -1) {

353 if (rle_code == 0) {

354 /* there's another skip code in the stream */

355 pixel_ptr += (bytestream2_get_byte(&s->g) - 1) * 4;

356 CHECK_PIXEL_PTR(0); /* make sure pixel_ptr is positive */

357 } else if (rle_code < 0) {

358 /* decode the run length code */

359 rle_code = -rle_code;

360 argb = bytestream2_get_be32(&s->g);

361

362 CHECK_PIXEL_PTR(rle_code * 4);

363

364 while (rle_code--) {

365 AV_WN32A(rgb + pixel_ptr, argb);

366 pixel_ptr += 4;

367 }

368 } else {

369 CHECK_PIXEL_PTR(rle_code * 4);

370

371 /* copy pixels directly to output */

372 while (rle_code--) {

373 argb = bytestream2_get_be32(&s->g);

374 AV_WN32A(rgb + pixel_ptr, argb);

375 pixel_ptr += 4;

376 }

377 }

378 }

379 row_ptr += row_inc;

380 }

381 }

382

383 static av_cold int qtrle_decode_init(AVCodecContext *avctx)

384 {

385 QtrleContext *s = avctx->priv_data;

386

387 s->avctx = avctx;

388 switch (avctx->bits_per_coded_sample) {

389 case 1:

390 case 2:

391 case 4:

392 case 8:

393 case 33:

394 case 34:

395 case 36:

396 case 40:

397 avctx->pix_fmt = AV_PIX_FMT_PAL8;

398 break;

399

400 case 16:

401 avctx->pix_fmt = AV_PIX_FMT_RGB555;

402 break;

403

404 case 24:

405 avctx->pix_fmt = AV_PIX_FMT_RGB24;

406 break;

407

408 case 32:

409 avctx->pix_fmt = AV_PIX_FMT_RGB32;

410 break;

411

412 default:

413 av_log (avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n",

414 avctx->bits_per_coded_sample);

415 return AVERROR_INVALIDDATA;

416 }

417

418 s->frame = av_frame_alloc();

419 if (!s->frame)

420 return AVERROR(ENOMEM);

421

422 return 0;

423 }

424

425 static int qtrle_decode_frame(AVCodecContext *avctx,

426 void *data, int *got_frame,

427 AVPacket *avpkt)

428 {

429 QtrleContext *s = avctx->priv_data;

430 int header, start_line;

431 int height, row_ptr;

432 int has_palette = 0;

433 int ret;

434

435 bytestream2_init(&s->g, avpkt->data, avpkt->size);

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

437 return ret;

438

439 /* check if this frame is even supposed to change */

440 if (avpkt->size < 8)

441 goto done;

442

443 /* start after the chunk size */

444 bytestream2_seek(&s->g, 4, SEEK_SET);

445

446 /* fetch the header */

447 header = bytestream2_get_be16(&s->g);

448

449 /* if a header is present, fetch additional decoding parameters */

450 if (header & 0x0008) {

451 if (avpkt->size < 14)

452 goto done;

453 start_line = bytestream2_get_be16(&s->g);

454 bytestream2_skip(&s->g, 2);

455 height = bytestream2_get_be16(&s->g);

456 bytestream2_skip(&s->g, 2);

457 if (height > s->avctx->height - start_line)

458 goto done;

459 } else {

460 start_line = 0;

461 height = s->avctx->height;

462 }

463 row_ptr = s->frame->linesize[0] * start_line;

464

465 switch (avctx->bits_per_coded_sample) {

466 case 1:

467 case 33:

468 qtrle_decode_1bpp(s, row_ptr, height);

469 has_palette = 1;

470 break;

471

472 case 2:

473 case 34:

474 qtrle_decode_2n4bpp(s, row_ptr, height, 2);

475 has_palette = 1;

476 break;

477

478 case 4:

479 case 36:

480 qtrle_decode_2n4bpp(s, row_ptr, height, 4);

481 has_palette = 1;

482 break;

483

484 case 8:

485 case 40:

486 qtrle_decode_8bpp(s, row_ptr, height);

487 has_palette = 1;

488 break;

489

490 case 16:

491 qtrle_decode_16bpp(s, row_ptr, height);

492 break;

493

494 case 24:

495 qtrle_decode_24bpp(s, row_ptr, height);

496 break;

497

498 case 32:

499 qtrle_decode_32bpp(s, row_ptr, height);

500 break;

501

502 default:

503 av_log (s->avctx, AV_LOG_ERROR, "Unsupported colorspace: %d bits/sample?\n",

504 avctx->bits_per_coded_sample);

505 break;

506 }

507

508 if(has_palette) {

509 const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);

510

511 if (pal) {

512 s->frame->palette_has_changed = 1;

513 memcpy(s->pal, pal, AVPALETTE_SIZE);

514 }

515

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

517 memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE);

518 }

519

520 done:

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

522 return ret;

523 *got_frame = 1;

524

525 /* always report that the buffer was completely consumed */

526 return avpkt->size;

527 }

528

529 static av_cold int qtrle_decode_end(AVCodecContext *avctx)

530 {

531 QtrleContext *s = avctx->priv_data;

532

533 av_frame_free(&s->frame);

534

535 return 0;

536 }

537

538 AVCodec ff_qtrle_decoder = {

539 .name = "qtrle",

540 .long_name = NULL_IF_CONFIG_SMALL("QuickTime Animation (RLE) video"),

541 .type = AVMEDIA_TYPE_VIDEO,

542 .id = AV_CODEC_ID_QTRLE,

543 .priv_data_size = sizeof(QtrleContext),

544 .init = qtrle_decode_init,

545 .close = qtrle_decode_end,

546 .decode = qtrle_decode_frame,

547 .capabilities = AV_CODEC_CAP_DR1,

548 };

NULL

#define NULL

Definition: coverity.c:32

qtrle_decode_2n4bpp

static void qtrle_decode_2n4bpp(QtrleContext *s, int row_ptr, int lines_to_change, int bpp)

Definition: qtrle.c:142

GetByteContext

Definition: bytestream.h:33

const char * s

Definition: avisynth_c.h:631

AVERROR_INVALIDDATA

#define AVERROR_INVALIDDATA

Invalid data found when processing input.

Definition: error.h:59

AVFrame

This structure describes decoded (raw) audio or video data.

Definition: frame.h:181

QtrleContext::g

GetByteContext g

Definition: qtrle.c:46

data

ptrdiff_t const GLvoid * data

Definition: opengl_enc.c:101

AV_PIX_FMT_RGB24

packed RGB 8:8:8, 24bpp, RGBRGB...

Definition: pixfmt.h:65

const char * g

Definition: vf_curves.c:108

init

static av_cold int init(AVCodecContext *avctx)

Definition: avrndec.c:35

QtrleContext::frame

AVFrame * frame

Definition: qtrle.c:44

AVPacket::size

int size

Definition: avcodec.h:1468

const char * b

Definition: vf_curves.c:109

AVCodecContext::pix_fmt

enum AVPixelFormat pix_fmt

Pixel format, see AV_PIX_FMT_xxx.

Definition: avcodec.h:1752

bytestream2_init

static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)

Definition: bytestream.h:133

AV_CODEC_ID_QTRLE

Definition: avcodec.h:162

AVCodec

AVCodec.

Definition: avcodec.h:3392

AV_WN32A

#define AV_WN32A(p, v)

Definition: intreadwrite.h:538

uint8_t

Definition: audio_convert.c:194

av_cold

#define av_cold

Definition: attributes.h:82

av_frame_alloc

AVFrame * av_frame_alloc(void)

Allocate an AVFrame and set its fields to default values.

Definition: frame.c:141

qtrle_decode_24bpp

static void qtrle_decode_24bpp(QtrleContext *s, int row_ptr, int lines_to_change)

Definition: qtrle.c:292

AV_PIX_FMT_PAL8

8 bit with AV_PIX_FMT_RGB32 palette

Definition: pixfmt.h:74

AVPALETTE_SIZE

#define AVPALETTE_SIZE

Definition: pixfmt.h:33

av_frame_ref

int av_frame_ref(AVFrame *dst, const AVFrame *src)

Set up a new reference to the data described by the source frame.

Definition: frame.c:375

QtrleContext::avctx

AVCodecContext * avctx

Definition: qtrle.c:43

AVPacket::data

uint8_t * data

Definition: avcodec.h:1467

qtrle_decode_init

static av_cold int qtrle_decode_init(AVCodecContext *avctx)

Definition: qtrle.c:383

qtrle_decode_1bpp

static void qtrle_decode_1bpp(QtrleContext *s, int row_ptr, int lines_to_change)

Definition: qtrle.c:57

header

static const uint8_t header[24]

Definition: sdr2.c:67

AVCodecContext::bits_per_coded_sample

int bits_per_coded_sample

bits per sample/pixel from the demuxer (needed for huffyuv).

Definition: avcodec.h:2917

av_log

#define av_log(a,...)

Definition: tableprint_vlc.h:28

AV_LOG_ERROR

#define AV_LOG_ERROR

Something went wrong and cannot losslessly be recovered.

Definition: log.h:176

AV_PKT_DATA_PALETTE

Definition: avcodec.h:1250

AVERROR

#define AVERROR(e)

Definition: error.h:43

bytestream2_skip

static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)

Definition: bytestream.h:164

av_frame_free

void av_frame_free(AVFrame **frame)

Free the frame and any dynamically allocated objects in it, e.g.

Definition: frame.c:154

NULL_IF_CONFIG_SMALL

#define NULL_IF_CONFIG_SMALL(x)

Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...

Definition: internal.h:176

const char * r

Definition: vf_curves.c:107

bytestream2_get_buffer

static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)

Definition: bytestream.h:263

AVCodec::name

const char * name

Name of the codec implementation.

Definition: avcodec.h:3399

bytestream.h

QtrleContext

Definition: qtrle.c:42

ff_reget_buffer

int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)

Identical in function to av_frame_make_writable(), except it uses ff_get_buffer() to allocate the buf...

Definition: utils.c:943

qtrle_decode_8bpp

static void qtrle_decode_8bpp(QtrleContext *s, int row_ptr, int lines_to_change)

Definition: qtrle.c:199

QtrleContext::pal

uint32_t pal[256]

Definition: qtrle.c:47

CHECK_PIXEL_PTR

#define CHECK_PIXEL_PTR(n)

Definition: qtrle.c:50

AVCodecContext::height

int height

Definition: avcodec.h:1711

avcodec.h

Libavcodec external API header.

AVFrame::linesize

int linesize[AV_NUM_DATA_POINTERS]

For video, size in bytes of each picture line.

Definition: frame.h:209

AVCodecContext

main external API structure.

Definition: avcodec.h:1532

AV_PIX_FMT_RGB32

#define AV_PIX_FMT_RGB32

Definition: pixfmt.h:307

height

BYTE int const BYTE int int int height

Definition: avisynth_c.h:676

AVFrame::palette_has_changed

int palette_has_changed

Tell user application that palette has changed from previous frame.

Definition: frame.h:322

qtrle_decode_32bpp

static void qtrle_decode_32bpp(QtrleContext *s, int row_ptr, int lines_to_change)

Definition: qtrle.c:339

AVFrame::data

uint8_t * data[AV_NUM_DATA_POINTERS]

pointer to the picture/channel planes.

Definition: frame.h:192

decode

static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)

Definition: ccaption_dec.c:572

internal.h

common internal api header.

qtrle_decode_frame

static int qtrle_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)

Definition: qtrle.c:425

AV_PIX_FMT_RGB555

#define AV_PIX_FMT_RGB555

Definition: pixfmt.h:318

AVCodecContext::priv_data

void * priv_data

Definition: avcodec.h:1574

ff_qtrle_decoder

AVCodec ff_qtrle_decoder

Definition: qtrle.c:538

bytestream2_seek

static av_always_inline int bytestream2_seek(GetByteContext *g, int offset, int whence)

Definition: bytestream.h:208

AVMEDIA_TYPE_VIDEO

Definition: avutil.h:193

av_packet_get_side_data

uint8_t * av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int *size)

Get side information from packet.

Definition: avpacket.c:320

qtrle_decode_16bpp

static void qtrle_decode_16bpp(QtrleContext *s, int row_ptr, int lines_to_change)

Definition: qtrle.c:248

qtrle_decode_end

static av_cold int qtrle_decode_end(AVCodecContext *avctx)

Definition: qtrle.c:529

AVPacket

This structure stores compressed data.

Definition: avcodec.h:1444

AV_CODEC_CAP_DR1

#define AV_CODEC_CAP_DR1

Codec uses get_buffer() for allocating buffers and supports custom allocators.

Definition: avcodec.h:856

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