FFmpeg: libavcodec/flashsv.c Source File

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libavcodec

flashsv.c

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1 /*

2 * Flash Screen Video decoder

5 *

6 * This file is part of FFmpeg.

7 *

8 * FFmpeg is free software; you can redistribute it and/or

9 * modify it under the terms of the GNU Lesser General Public

10 * License as published by the Free Software Foundation; either

11 * version 2.1 of the License, or (at your option) any later version.

12 *

13 * FFmpeg is distributed in the hope that it will be useful,

14 * but WITHOUT ANY WARRANTY; without even the implied warranty of

15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

16 * Lesser General Public License for more details.

17 *

18 * You should have received a copy of the GNU Lesser General Public

19 * License along with FFmpeg; if not, write to the Free Software

20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

21 */

23 /**

24 * @file

25 * Flash Screen Video decoder

26 * @author Alex Beregszaszi

27 * @author Benjamin Larsson

28 * @author Daniel Verkamp

29 * @author Konstantin Shishkov

30 *

31 * A description of the bitstream format for Flash Screen Video version 1/2

32 * is part of the SWF File Format Specification (version 10), which can be

33 * downloaded from http://www.adobe.com/devnet/swf.html.

34 */

36 #include <stdio.h>

37 #include <stdlib.h>

38 #include <zlib.h>

40 #include "libavutil/intreadwrite.h"

41 #include "avcodec.h"

42 #include "bytestream.h"

43 #include "get_bits.h"

44 #include "internal.h"

46 typedef struct BlockInfo {

47 uint8_t *pos;

48 int size;

49 } BlockInfo;

51 typedef struct FlashSVContext {

52 AVCodecContext *avctx;

53 AVFrame *frame;

54 int image_width, image_height;

55 int block_width, block_height;

56 uint8_t *tmpblock;

57 int block_size;

58 z_stream zstream;

59 int ver;

60 const uint32_t *pal;

61 int is_keyframe;

62 uint8_t *keyframedata;

63 uint8_t *keyframe;

64 BlockInfo *blocks;

65 uint8_t *deflate_block;

66 int deflate_block_size;

67 int color_depth;

68 int zlibprime_curr, zlibprime_prev;

69 int diff_start, diff_height;

70 } FlashSVContext;

72 static int decode_hybrid(const uint8_t *sptr, const uint8_t *sptr_end, uint8_t *dptr, int dx, int dy,

73 int h, int w, int stride, const uint32_t *pal)

74 {

75 int x, y;

76 const uint8_t *orig_src = sptr;

78 for (y = dx + h; y > dx; y--) {

79 uint8_t *dst = dptr + (y * stride) + dy * 3;

80 for (x = 0; x < w; x++) {

81 if (sptr >= sptr_end)

82 return AVERROR_INVALIDDATA;

83 if (*sptr & 0x80) {

84 /* 15-bit color */

85 unsigned c = AV_RB16(sptr) & ~0x8000;

86 unsigned b = c & 0x1F;

87 unsigned g = (c >> 5) & 0x1F;

88 unsigned r = c >> 10;

89 /* 000aaabb -> aaabbaaa */

90 *dst++ = (b << 3) | (b >> 2);

91 *dst++ = (g << 3) | (g >> 2);

92 *dst++ = (r << 3) | (r >> 2);

93 sptr += 2;

94 } else {

95 /* palette index */

96 uint32_t c = pal[*sptr++];

97 bytestream_put_le24(&dst, c);

98 }

99 }

100 }

101 return sptr - orig_src;

102 }

103

104 static av_cold int flashsv_decode_end(AVCodecContext *avctx)

105 {

106 FlashSVContext *s = avctx->priv_data;

107 inflateEnd(&s->zstream);

108 /* release the frame if needed */

109 av_frame_free(&s->frame);

110

111 /* free the tmpblock */

112 av_freep(&s->tmpblock);

113

114 return 0;

115 }

116

117 static av_cold int flashsv_decode_init(AVCodecContext *avctx)

118 {

119 FlashSVContext *s = avctx->priv_data;

120 int zret; // Zlib return code

121

122 s->avctx = avctx;

123 s->zstream.zalloc = Z_NULL;

124 s->zstream.zfree = Z_NULL;

125 s->zstream.opaque = Z_NULL;

126 zret = inflateInit(&s->zstream);

127 if (zret != Z_OK) {

128 av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);

129 return 1;

130 }

131 avctx->pix_fmt = AV_PIX_FMT_BGR24;

132

133 s->frame = av_frame_alloc();

134 if (!s->frame) {

135 flashsv_decode_end(avctx);

136 return AVERROR(ENOMEM);

137 }

138

139 return 0;

140 }

141

142 static int flashsv2_prime(FlashSVContext *s, uint8_t *src, int size)

143 {

144 z_stream zs;

145 int zret; // Zlib return code

146

147 if (!src)

148 return AVERROR_INVALIDDATA;

149

150 zs.zalloc = NULL;

151 zs.zfree = NULL;

152 zs.opaque = NULL;

153

154 s->zstream.next_in = src;

155 s->zstream.avail_in = size;

156 s->zstream.next_out = s->tmpblock;

157 s->zstream.avail_out = s->block_size * 3;

158 inflate(&s->zstream, Z_SYNC_FLUSH);

159

160 if (deflateInit(&zs, 0) != Z_OK)

161 return -1;

162 zs.next_in = s->tmpblock;

163 zs.avail_in = s->block_size * 3 - s->zstream.avail_out;

164 zs.next_out = s->deflate_block;

165 zs.avail_out = s->deflate_block_size;

166 deflate(&zs, Z_SYNC_FLUSH);

167 deflateEnd(&zs);

168

169 if ((zret = inflateReset(&s->zstream)) != Z_OK) {

170 av_log(s->avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);

171 return AVERROR_UNKNOWN;

172 }

173

174 s->zstream.next_in = s->deflate_block;

175 s->zstream.avail_in = s->deflate_block_size - zs.avail_out;

176 s->zstream.next_out = s->tmpblock;

177 s->zstream.avail_out = s->block_size * 3;

178 inflate(&s->zstream, Z_SYNC_FLUSH);

179

180 return 0;

181 }

182

183 static int flashsv_decode_block(AVCodecContext *avctx, AVPacket *avpkt,

184 GetBitContext *gb, int block_size,

185 int width, int height, int x_pos, int y_pos,

186 int blk_idx)

187 {

188 struct FlashSVContext *s = avctx->priv_data;

189 uint8_t *line = s->tmpblock;

190 int k;

191 int ret = inflateReset(&s->zstream);

192 if (ret != Z_OK) {

193 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);

194 return AVERROR_UNKNOWN;

195 }

196 if (s->zlibprime_curr || s->zlibprime_prev) {

197 ret = flashsv2_prime(s,

198 s->blocks[blk_idx].pos,

199 s->blocks[blk_idx].size);

200 if (ret < 0)

201 return ret;

202 }

203 s->zstream.next_in = avpkt->data + get_bits_count(gb) / 8;

204 s->zstream.avail_in = block_size;

205 s->zstream.next_out = s->tmpblock;

206 s->zstream.avail_out = s->block_size * 3;

207 ret = inflate(&s->zstream, Z_FINISH);

208 if (ret == Z_DATA_ERROR) {

209 av_log(avctx, AV_LOG_ERROR, "Zlib resync occurred\n");

210 inflateSync(&s->zstream);

211 ret = inflate(&s->zstream, Z_FINISH);

212 }

213

214 if (ret != Z_OK && ret != Z_STREAM_END) {

215 //return -1;

216 }

217

218 if (s->is_keyframe) {

219 s->blocks[blk_idx].pos = s->keyframedata + (get_bits_count(gb) / 8);

220 s->blocks[blk_idx].size = block_size;

221 }

222

223 y_pos += s->diff_start;

224

225 if (!s->color_depth) {

226 /* Flash Screen Video stores the image upside down, so copy

227 * lines to destination in reverse order. */

228 for (k = 1; k <= s->diff_height; k++) {

229 memcpy(s->frame->data[0] + x_pos * 3 +

230 (s->image_height - y_pos - k) * s->frame->linesize[0],

231 line, width * 3);

232 /* advance source pointer to next line */

233 line += width * 3;

234 }

235 } else {

236 /* hybrid 15-bit/palette mode */

237 ret = decode_hybrid(s->tmpblock, s->zstream.next_out,

238 s->frame->data[0],

239 s->image_height - (y_pos + 1 + s->diff_height),

240 x_pos, s->diff_height, width,

241 s->frame->linesize[0], s->pal);

242 if (ret < 0) {

243 av_log(avctx, AV_LOG_ERROR, "decode_hybrid failed\n");

244 return ret;

245 }

246 }

247 skip_bits_long(gb, 8 * block_size); /* skip the consumed bits */

248 return 0;

249 }

250

251 static int calc_deflate_block_size(int tmpblock_size)

252 {

253 z_stream zstream;

254 int size;

255

256 zstream.zalloc = Z_NULL;

257 zstream.zfree = Z_NULL;

258 zstream.opaque = Z_NULL;

259 if (deflateInit(&zstream, 0) != Z_OK)

260 return -1;

261 size = deflateBound(&zstream, tmpblock_size);

262 deflateEnd(&zstream);

263

264 return size;

265 }

266

267 static int flashsv_decode_frame(AVCodecContext *avctx, void *data,

268 int *got_frame, AVPacket *avpkt)

269 {

270 int buf_size = avpkt->size;

271 FlashSVContext *s = avctx->priv_data;

272 int h_blocks, v_blocks, h_part, v_part, i, j, ret;

273 GetBitContext gb;

274 int last_blockwidth = s->block_width;

275 int last_blockheight= s->block_height;

276

277 /* no supplementary picture */

278 if (buf_size == 0)

279 return 0;

280 if (buf_size < 4)

281 return -1;

282

283 if ((ret = init_get_bits8(&gb, avpkt->data, buf_size)) < 0)

284 return ret;

285

286 /* start to parse the bitstream */

287 s->block_width = 16 * (get_bits(&gb, 4) + 1);

288 s->image_width = get_bits(&gb, 12);

289 s->block_height = 16 * (get_bits(&gb, 4) + 1);

290 s->image_height = get_bits(&gb, 12);

291

292 if ( last_blockwidth != s->block_width

293 || last_blockheight!= s->block_height)

294 av_freep(&s->blocks);

295

296 if (s->ver == 2) {

297 skip_bits(&gb, 6);

298 if (get_bits1(&gb)) {

299 avpriv_request_sample(avctx, "iframe");

300 return AVERROR_PATCHWELCOME;

301 }

302 if (get_bits1(&gb)) {

303 avpriv_request_sample(avctx, "Custom palette");

304 return AVERROR_PATCHWELCOME;

305 }

306 }

307

308 /* calculate number of blocks and size of border (partial) blocks */

309 h_blocks = s->image_width / s->block_width;

310 h_part = s->image_width % s->block_width;

311 v_blocks = s->image_height / s->block_height;

312 v_part = s->image_height % s->block_height;

313

314 /* the block size could change between frames, make sure the buffer

315 * is large enough, if not, get a larger one */

316 if (s->block_size < s->block_width * s->block_height) {

317 int tmpblock_size = 3 * s->block_width * s->block_height, err;

318

319 if ((err = av_reallocp(&s->tmpblock, tmpblock_size)) < 0) {

320 s->block_size = 0;

321 av_log(avctx, AV_LOG_ERROR,

322 "Cannot allocate decompression buffer.\n");

323 return err;

324 }

325 if (s->ver == 2) {

326 s->deflate_block_size = calc_deflate_block_size(tmpblock_size);

327 if (s->deflate_block_size <= 0) {

328 av_log(avctx, AV_LOG_ERROR,

329 "Cannot determine deflate buffer size.\n");

330 return -1;

331 }

332 if ((err = av_reallocp(&s->deflate_block, s->deflate_block_size)) < 0) {

333 s->block_size = 0;

334 av_log(avctx, AV_LOG_ERROR, "Cannot allocate deflate buffer.\n");

335 return err;

336 }

337 }

338 }

339 s->block_size = s->block_width * s->block_height;

340

341 /* initialize the image size once */

342 if (avctx->width == 0 && avctx->height == 0) {

343 if ((ret = ff_set_dimensions(avctx, s->image_width, s->image_height)) < 0)

344 return ret;

345 }

346

347 /* check for changes of image width and image height */

348 if (avctx->width != s->image_width || avctx->height != s->image_height) {

349 av_log(avctx, AV_LOG_ERROR,

350 "Frame width or height differs from first frame!\n");

351 av_log(avctx, AV_LOG_ERROR, "fh = %d, fv %d vs ch = %d, cv = %d\n",

352 avctx->height, avctx->width, s->image_height, s->image_width);

353 return AVERROR_INVALIDDATA;

354 }

355

356 /* we care for keyframes only in Screen Video v2 */

357 s->is_keyframe = (avpkt->flags & AV_PKT_FLAG_KEY) && (s->ver == 2);

358 if (s->is_keyframe) {

359 int err;

360 if ((err = av_reallocp(&s->keyframedata, avpkt->size)) < 0)

361 return err;

362 memcpy(s->keyframedata, avpkt->data, avpkt->size);

363 }

364 if(s->ver == 2 && !s->blocks)

365 s->blocks = av_mallocz((v_blocks + !!v_part) * (h_blocks + !!h_part) *

366 sizeof(s->blocks[0]));

367

368 ff_dlog(avctx, "image: %dx%d block: %dx%d num: %dx%d part: %dx%d\n",

369 s->image_width, s->image_height, s->block_width, s->block_height,

370 h_blocks, v_blocks, h_part, v_part);

371

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

373 return ret;

374

375 /* loop over all block columns */

376 for (j = 0; j < v_blocks + (v_part ? 1 : 0); j++) {

377

378 int y_pos = j * s->block_height; // vertical position in frame

379 int cur_blk_height = (j < v_blocks) ? s->block_height : v_part;

380

381 /* loop over all block rows */

382 for (i = 0; i < h_blocks + (h_part ? 1 : 0); i++) {

383 int x_pos = i * s->block_width; // horizontal position in frame

384 int cur_blk_width = (i < h_blocks) ? s->block_width : h_part;

385 int has_diff = 0;

386

387 /* get the size of the compressed zlib chunk */

388 int size = get_bits(&gb, 16);

389

390 s->color_depth = 0;

391 s->zlibprime_curr = 0;

392 s->zlibprime_prev = 0;

393 s->diff_start = 0;

394 s->diff_height = cur_blk_height;

395

396 if (8 * size > get_bits_left(&gb)) {

397 av_frame_unref(s->frame);

398 return AVERROR_INVALIDDATA;

399 }

400

401 if (s->ver == 2 && size) {

402 skip_bits(&gb, 3);

403 s->color_depth = get_bits(&gb, 2);

404 has_diff = get_bits1(&gb);

405 s->zlibprime_curr = get_bits1(&gb);

406 s->zlibprime_prev = get_bits1(&gb);

407

408 if (s->color_depth != 0 && s->color_depth != 2) {

409 av_log(avctx, AV_LOG_ERROR,

410 "%dx%d invalid color depth %d\n",

411 i, j, s->color_depth);

412 return AVERROR_INVALIDDATA;

413 }

414

415 if (has_diff) {

416 if (size < 3) {

417 av_log(avctx, AV_LOG_ERROR, "size too small for diff\n");

418 return AVERROR_INVALIDDATA;

419 }

420 if (!s->keyframe) {

421 av_log(avctx, AV_LOG_ERROR,

422 "Inter frame without keyframe\n");

423 return AVERROR_INVALIDDATA;

424 }

425 s->diff_start = get_bits(&gb, 8);

426 s->diff_height = get_bits(&gb, 8);

427 if (s->diff_start + s->diff_height > cur_blk_height) {

428 av_log(avctx, AV_LOG_ERROR,

429 "Block parameters invalid: %d + %d > %d\n",

430 s->diff_start, s->diff_height, cur_blk_height);

431 return AVERROR_INVALIDDATA;

432 }

433 av_log(avctx, AV_LOG_DEBUG,

434 "%dx%d diff start %d height %d\n",

435 i, j, s->diff_start, s->diff_height);

436 size -= 2;

437 }

438

439 if (s->zlibprime_prev)

440 av_log(avctx, AV_LOG_DEBUG, "%dx%d zlibprime_prev\n", i, j);

441

442 if (s->zlibprime_curr) {

443 int col = get_bits(&gb, 8);

444 int row = get_bits(&gb, 8);

445 av_log(avctx, AV_LOG_DEBUG, "%dx%d zlibprime_curr %dx%d\n",

446 i, j, col, row);

447 if (size < 3) {

448 av_log(avctx, AV_LOG_ERROR, "size too small for zlibprime_curr\n");

449 return AVERROR_INVALIDDATA;

450 }

451 size -= 2;

452 avpriv_request_sample(avctx, "zlibprime_curr");

453 return AVERROR_PATCHWELCOME;

454 }

455 if (!s->blocks && (s->zlibprime_curr || s->zlibprime_prev)) {

456 av_log(avctx, AV_LOG_ERROR,

457 "no data available for zlib priming\n");

458 return AVERROR_INVALIDDATA;

459 }

460 size--; // account for flags byte

461 }

462

463 if (has_diff) {

464 int k;

465 int off = (s->image_height - y_pos - 1) * s->frame->linesize[0];

466

467 for (k = 0; k < cur_blk_height; k++) {

468 int x = off - k * s->frame->linesize[0] + x_pos * 3;

469 memcpy(s->frame->data[0] + x, s->keyframe + x,

470 cur_blk_width * 3);

471 }

472 }

473

474 /* skip unchanged blocks, which have size 0 */

475 if (size) {

476 if (flashsv_decode_block(avctx, avpkt, &gb, size,

477 cur_blk_width, cur_blk_height,

478 x_pos, y_pos,

479 i + j * (h_blocks + !!h_part)))

480 av_log(avctx, AV_LOG_ERROR,

481 "error in decompression of block %dx%d\n", i, j);

482 }

483 }

484 }

485 if (s->is_keyframe && s->ver == 2) {

486 if (!s->keyframe) {

487 s->keyframe = av_malloc(s->frame->linesize[0] * avctx->height);

488 if (!s->keyframe) {

489 av_log(avctx, AV_LOG_ERROR, "Cannot allocate image data\n");

490 return AVERROR(ENOMEM);

491 }

492 }

493 memcpy(s->keyframe, s->frame->data[0],

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

495 }

496

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

498 return ret;

499

500 *got_frame = 1;

501

502 if ((get_bits_count(&gb) / 8) != buf_size)

503 av_log(avctx, AV_LOG_ERROR, "buffer not fully consumed (%d != %d)\n",

504 buf_size, (get_bits_count(&gb) / 8));

505

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

507 return buf_size;

508 }

509

510 #if CONFIG_FLASHSV_DECODER

511 AVCodec ff_flashsv_decoder = {

512 .name = "flashsv",

513 .long_name = NULL_IF_CONFIG_SMALL("Flash Screen Video v1"),

514 .type = AVMEDIA_TYPE_VIDEO,

515 .id = AV_CODEC_ID_FLASHSV,

516 .priv_data_size = sizeof(FlashSVContext),

517 .init = flashsv_decode_init,

518 .close = flashsv_decode_end,

519 .decode = flashsv_decode_frame,

520 .capabilities = AV_CODEC_CAP_DR1,

521 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },

522 };

523 #endif /* CONFIG_FLASHSV_DECODER */

524

525 #if CONFIG_FLASHSV2_DECODER

526 static const uint32_t ff_flashsv2_default_palette[128] = {

527 0x000000, 0x333333, 0x666666, 0x999999, 0xCCCCCC, 0xFFFFFF,

528 0x330000, 0x660000, 0x990000, 0xCC0000, 0xFF0000, 0x003300,

529 0x006600, 0x009900, 0x00CC00, 0x00FF00, 0x000033, 0x000066,

530 0x000099, 0x0000CC, 0x0000FF, 0x333300, 0x666600, 0x999900,

531 0xCCCC00, 0xFFFF00, 0x003333, 0x006666, 0x009999, 0x00CCCC,

532 0x00FFFF, 0x330033, 0x660066, 0x990099, 0xCC00CC, 0xFF00FF,

533 0xFFFF33, 0xFFFF66, 0xFFFF99, 0xFFFFCC, 0xFF33FF, 0xFF66FF,

534 0xFF99FF, 0xFFCCFF, 0x33FFFF, 0x66FFFF, 0x99FFFF, 0xCCFFFF,

535 0xCCCC33, 0xCCCC66, 0xCCCC99, 0xCCCCFF, 0xCC33CC, 0xCC66CC,

536 0xCC99CC, 0xCCFFCC, 0x33CCCC, 0x66CCCC, 0x99CCCC, 0xFFCCCC,

537 0x999933, 0x999966, 0x9999CC, 0x9999FF, 0x993399, 0x996699,

538 0x99CC99, 0x99FF99, 0x339999, 0x669999, 0xCC9999, 0xFF9999,

539 0x666633, 0x666699, 0x6666CC, 0x6666FF, 0x663366, 0x669966,

540 0x66CC66, 0x66FF66, 0x336666, 0x996666, 0xCC6666, 0xFF6666,

541 0x333366, 0x333399, 0x3333CC, 0x3333FF, 0x336633, 0x339933,

542 0x33CC33, 0x33FF33, 0x663333, 0x993333, 0xCC3333, 0xFF3333,

543 0x003366, 0x336600, 0x660033, 0x006633, 0x330066, 0x663300,

544 0x336699, 0x669933, 0x993366, 0x339966, 0x663399, 0x996633,

545 0x6699CC, 0x99CC66, 0xCC6699, 0x66CC99, 0x9966CC, 0xCC9966,

546 0x99CCFF, 0xCCFF99, 0xFF99CC, 0x99FFCC, 0xCC99FF, 0xFFCC99,

547 0x111111, 0x222222, 0x444444, 0x555555, 0xAAAAAA, 0xBBBBBB,

548 0xDDDDDD, 0xEEEEEE

549 };

550

551 static av_cold int flashsv2_decode_init(AVCodecContext *avctx)

552 {

553 FlashSVContext *s = avctx->priv_data;

554 flashsv_decode_init(avctx);

555 s->pal = ff_flashsv2_default_palette;

556 s->ver = 2;

557

558 return 0;

559 }

560

561 static av_cold int flashsv2_decode_end(AVCodecContext *avctx)

562 {

563 FlashSVContext *s = avctx->priv_data;

564

565 av_freep(&s->keyframedata);

566 av_freep(&s->blocks);

567 av_freep(&s->keyframe);

568 av_freep(&s->deflate_block);

569 flashsv_decode_end(avctx);

570

571 return 0;

572 }

573

574 AVCodec ff_flashsv2_decoder = {

575 .name = "flashsv2",

576 .long_name = NULL_IF_CONFIG_SMALL("Flash Screen Video v2"),

577 .type = AVMEDIA_TYPE_VIDEO,

578 .id = AV_CODEC_ID_FLASHSV2,

579 .priv_data_size = sizeof(FlashSVContext),

580 .init = flashsv2_decode_init,

581 .close = flashsv2_decode_end,

582 .decode = flashsv_decode_frame,

583 .capabilities = AV_CODEC_CAP_DR1,

584 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_NONE },

585 };

586 #endif /* CONFIG_FLASHSV2_DECODER */

FlashSVContext::zlibprime_prev

int zlibprime_prev

Definition: flashsv.c:68

NULL

#define NULL

Definition: coverity.c:32

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

AV_PIX_FMT_NONE

Definition: pixfmt.h:62

Definition: vp9dsp_template.c:2093

data

ptrdiff_t const GLvoid * data

Definition: opengl_enc.c:101

BlockInfo::size

int size

Definition: flashsv.c:48

get_bits

static unsigned int get_bits(GetBitContext *s, int n)

Read 1-25 bits.

Definition: get_bits.h:260

FlashSVContext::keyframe

uint8_t * keyframe

Definition: flashsv.c:63

ff_set_dimensions

int ff_set_dimensions(AVCodecContext *s, int width, int height)

Check that the provided frame dimensions are valid and set them on the codec context.

Definition: utils.c:209

skip_bits_long

static void skip_bits_long(GetBitContext *s, int n)

Definition: get_bits.h:217

const char * g

Definition: vf_curves.c:108

init

static av_cold int init(AVCodecContext *avctx)

Definition: avrndec.c:35

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

FlashSVContext::frame

AVFrame * frame

Definition: flashsv.c:53

BlockInfo

Definition: dvdec.c:53

AV_CODEC_ID_FLASHSV2

Definition: avcodec.h:238

AV_RB16

uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16

Definition: bytestream.h:87

AVCodec

AVCodec.

Definition: avcodec.h:3392

decode_hybrid

static int decode_hybrid(const uint8_t *sptr, const uint8_t *sptr_end, uint8_t *dptr, int dx, int dy, int h, int w, int stride, const uint32_t *pal)

Definition: flashsv.c:72

FlashSVContext::pal

const uint32_t * pal

Definition: flashsv.c:60

flashsv_decode_end

static av_cold int flashsv_decode_end(AVCodecContext *avctx)

Definition: flashsv.c:104

FlashSVContext::avctx

AVCodecContext * avctx

Definition: flashsv.c:52

avpriv_request_sample

void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2

Log a generic warning message about a missing feature.

uint8_t

Definition: audio_convert.c:194

av_cold

#define av_cold

Definition: attributes.h:82

av_malloc

#define av_malloc(s)

Definition: tableprint_vlc.h:31

av_frame_alloc

AVFrame * av_frame_alloc(void)

Allocate an AVFrame and set its fields to default values.

Definition: frame.c:141

deflate

static void deflate(uint8_t *dst, const uint8_t *p1, int width, int threshold, const uint8_t *coordinates[], int coord)

Definition: vf_neighbor.c:114

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

AVPacket::data

uint8_t * data

Definition: avcodec.h:1467

inflate

static void inflate(uint8_t *dst, const uint8_t *p1, int width, int threshold, const uint8_t *coordinates[], int coord)

Definition: vf_neighbor.c:129

get_bits_count

static int get_bits_count(const GetBitContext *s)

Definition: get_bits.h:212

ff_dlog

#define ff_dlog(a,...)

Definition: tableprint_vlc.h:29

get_bits.h

bitstream reader API header.

FlashSVContext::image_width

int image_width

Definition: flashsv.c:54

size

ptrdiff_t size

Definition: opengl_enc.c:101

FlashSVContext::diff_start

int diff_start

Definition: flashsv.c:69

AV_CODEC_ID_FLASHSV

Definition: avcodec.h:193

av_log

#define av_log(a,...)

Definition: tableprint_vlc.h:28

AV_PKT_FLAG_KEY

#define AV_PKT_FLAG_KEY

The packet contains a keyframe.

Definition: avcodec.h:1499

get_bits_left

static int get_bits_left(GetBitContext *gb)

Definition: get_bits.h:607

flashsv_decode_init

static av_cold int flashsv_decode_init(AVCodecContext *avctx)

Definition: flashsv.c:117

AV_LOG_ERROR

#define AV_LOG_ERROR

Something went wrong and cannot losslessly be recovered.

Definition: log.h:176

FlashSVContext::block_width

int block_width

Definition: flashsv.c:55

AVERROR

#define AVERROR(e)

Definition: error.h:43

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

AV_LOG_DEBUG

#define AV_LOG_DEBUG

Stuff which is only useful for libav* developers.

Definition: log.h:197

line

Definition: graph2dot.c:48

AVCodec::name

const char * name

Name of the codec implementation.

Definition: avcodec.h:3399

bytestream.h

AVPacket::flags

int flags

A combination of AV_PKT_FLAG values.

Definition: avcodec.h:1473

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

intreadwrite.h

AVCodecContext::width

int width

picture width / height.

Definition: avcodec.h:1711

flashsv2_prime

static int flashsv2_prime(FlashSVContext *s, uint8_t *src, int size)

Definition: flashsv.c:142

AV_PIX_FMT_BGR24

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

Definition: pixfmt.h:66

flashsv_decode_frame

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

Definition: flashsv.c:267

src

#define src

Definition: vp9dsp.c:530

AVCodecContext::height

int height

Definition: avcodec.h:1711

AVERROR_PATCHWELCOME

#define AVERROR_PATCHWELCOME

Not yet implemented in FFmpeg, patches welcome.

Definition: error.h:62

FlashSVContext::ver

int ver

Definition: flashsv.c:59

FlashSVContext::block_size

int block_size

Definition: flashsv.c:57

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

BlockInfo::pos

uint8_t pos

Definition: dvdec.c:56

FlashSVContext

Definition: flashsv.c:51

init_get_bits8

static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)

Initialize GetBitContext.

Definition: get_bits.h:449

AVCodecContext

main external API structure.

Definition: avcodec.h:1532

get_bits1

static unsigned int get_bits1(GetBitContext *s)

Definition: get_bits.h:312

calc_deflate_block_size

static int calc_deflate_block_size(int tmpblock_size)

Definition: flashsv.c:251

height

BYTE int const BYTE int int int height

Definition: avisynth_c.h:676

FlashSVContext::zlibprime_curr

int zlibprime_curr

Definition: flashsv.c:68

skip_bits

static void skip_bits(GetBitContext *s, int n)

Definition: get_bits.h:305

FlashSVContext::is_keyframe

int is_keyframe

Definition: flashsv.c:61

FlashSVContext::zstream

z_stream zstream

Definition: flashsv.c:58

pix_fmts

static enum AVPixelFormat pix_fmts[]

Definition: libkvazaar.c:262

av_frame_unref

void av_frame_unref(AVFrame *frame)

Unreference all the buffers referenced by frame and reset the frame fields.

Definition: frame.c:474

FlashSVContext::color_depth

int color_depth

Definition: flashsv.c:67

AVFrame::data

uint8_t * data[AV_NUM_DATA_POINTERS]

pointer to the picture/channel planes.

Definition: frame.h:192

FlashSVContext::deflate_block_size

int deflate_block_size

Definition: flashsv.c:66

decode

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

Definition: ccaption_dec.c:572

stride

GLint GLenum GLboolean GLsizei stride

Definition: opengl_enc.c:105

BlockInfo::pos

uint8_t * pos

Definition: flashsv.c:47

GetBitContext

Definition: get_bits.h:54

internal.h

common internal api header.

static double c[64]

Definition: vsrc_mptestsrc.c:87

av_reallocp

int av_reallocp(void *ptr, size_t size)

Allocate or reallocate a block of memory.

Definition: mem.c:187

FlashSVContext::deflate_block

uint8_t * deflate_block

Definition: flashsv.c:65

AVERROR_UNKNOWN

#define AVERROR_UNKNOWN

Unknown error, typically from an external library.

Definition: error.h:71

FlashSVContext::blocks

BlockInfo * blocks

Definition: flashsv.c:64

AVCodecContext::priv_data

void * priv_data

Definition: avcodec.h:1574

FlashSVContext::tmpblock

uint8_t * tmpblock

Definition: flashsv.c:56

FlashSVContext::keyframedata

uint8_t * keyframedata

Definition: flashsv.c:62

av_freep

#define av_freep(p)

Definition: tableprint_vlc.h:35

flashsv_decode_block

static int flashsv_decode_block(AVCodecContext *avctx, AVPacket *avpkt, GetBitContext *gb, int block_size, int width, int height, int x_pos, int y_pos, int blk_idx)

Definition: flashsv.c:183

AVMEDIA_TYPE_VIDEO

Definition: avutil.h:193

FlashSVContext::block_height

int block_height

Definition: flashsv.c:55

stride

#define stride

AVPixelFormat

Pixel format.

Definition: pixfmt.h:61

AVPacket