FFmpeg: libavcodec/proresdec_lgpl.c Source File

FFmpeg

[フレーム]

libavcodec

proresdec_lgpl.c

Go to the documentation of this file.

1 /*

2 * Apple ProRes compatible decoder

3 *

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 * This is a decoder for Apple ProRes 422 SD/HQ/LT/Proxy and ProRes 4444.

26 * It is used for storing and editing high definition video data in Apple's Final Cut Pro.

27 *

28 * @see http://wiki.multimedia.cx/index.php?title=Apple_ProRes

29 */

31 #define LONG_BITSTREAM_READER // some ProRes vlc codes require up to 28 bits to be read at once

33 #include <stdint.h>

35 #include "libavutil/intmath.h"

36 #include "avcodec.h"

37 #include "dsputil.h"

38 #include "internal.h"

39 #include "proresdata.h"

40 #include "proresdsp.h"

41 #include "get_bits.h"

43 typedef struct {

44 const uint8_t *index; ///< pointers to the data of this slice

45 int slice_num;

46 int x_pos, y_pos;

47 int slice_width;

48 int prev_slice_sf; ///< scalefactor of the previous decoded slice

49 DECLARE_ALIGNED(16, int16_t, blocks)[8 * 4 * 64];

50 DECLARE_ALIGNED(16, int16_t, qmat_luma_scaled)[64];

51 DECLARE_ALIGNED(16, int16_t, qmat_chroma_scaled)[64];

52 } ProresThreadData;

54 typedef struct {

55 ProresDSPContext dsp;

56 AVFrame *frame;

57 ScanTable scantable;

58 int scantable_type; ///< -1 = uninitialized, 0 = progressive, 1/2 = interlaced

60 int frame_type; ///< 0 = progressive, 1 = top-field first, 2 = bottom-field first

61 int pic_format; ///< 2 = 422, 3 = 444

62 uint8_t qmat_luma[64]; ///< dequantization matrix for luma

63 uint8_t qmat_chroma[64]; ///< dequantization matrix for chroma

64 int qmat_changed; ///< 1 - global quantization matrices changed

65 int total_slices; ///< total number of slices in a picture

66 ProresThreadData *slice_data;

67 int pic_num;

68 int chroma_factor;

69 int mb_chroma_factor;

70 int num_chroma_blocks; ///< number of chrominance blocks in a macroblock

71 int num_x_slices;

72 int num_y_slices;

73 int slice_width_factor;

74 int slice_height_factor;

75 int num_x_mbs;

76 int num_y_mbs;

77 int alpha_info;

78 } ProresContext;

81 static av_cold int decode_init(AVCodecContext *avctx)

82 {

83 ProresContext *ctx = avctx->priv_data;

85 ctx->total_slices = 0;

86 ctx->slice_data = NULL;

88 avctx->bits_per_raw_sample = PRORES_BITS_PER_SAMPLE;

89 ff_proresdsp_init(&ctx->dsp, avctx);

91 ctx->scantable_type = -1; // set scantable type to uninitialized

92 memset(ctx->qmat_luma, 4, 64);

93 memset(ctx->qmat_chroma, 4, 64);

95 return 0;

96 }

99 static int decode_frame_header(ProresContext *ctx, const uint8_t *buf,

100 const int data_size, AVCodecContext *avctx)

101 {

102 int hdr_size, version, width, height, flags;

103 const uint8_t *ptr;

104

105 hdr_size = AV_RB16(buf);

106 if (hdr_size > data_size) {

107 av_log(avctx, AV_LOG_ERROR, "frame data too small\n");

108 return AVERROR_INVALIDDATA;

109 }

110

111 version = AV_RB16(buf + 2);

112 if (version >= 2) {

113 av_log(avctx, AV_LOG_ERROR,

114 "unsupported header version: %d\n", version);

115 return AVERROR_INVALIDDATA;

116 }

117

118 width = AV_RB16(buf + 8);

119 height = AV_RB16(buf + 10);

120 if (width != avctx->width || height != avctx->height) {

121 av_log(avctx, AV_LOG_ERROR,

122 "picture dimension changed: old: %d x %d, new: %d x %d\n",

123 avctx->width, avctx->height, width, height);

124 return AVERROR_INVALIDDATA;

125 }

126

127 ctx->frame_type = (buf[12] >> 2) & 3;

128 if (ctx->frame_type > 2) {

129 av_log(avctx, AV_LOG_ERROR,

130 "unsupported frame type: %d\n", ctx->frame_type);

131 return AVERROR_INVALIDDATA;

132 }

133

134 ctx->chroma_factor = (buf[12] >> 6) & 3;

135 ctx->mb_chroma_factor = ctx->chroma_factor + 2;

136 ctx->num_chroma_blocks = (1 << ctx->chroma_factor) >> 1;

137 ctx->alpha_info = buf[17] & 0xf;

138

139 if (ctx->alpha_info > 2) {

140 av_log(avctx, AV_LOG_ERROR, "Invalid alpha mode %d\n", ctx->alpha_info);

141 return AVERROR_INVALIDDATA;

142 }

143 if (avctx->skip_alpha) ctx->alpha_info = 0;

144

145 switch (ctx->chroma_factor) {

146 case 2:

147 avctx->pix_fmt = ctx->alpha_info ? AV_PIX_FMT_YUVA422P10

148 : AV_PIX_FMT_YUV422P10;

149 break;

150 case 3:

151 avctx->pix_fmt = ctx->alpha_info ? AV_PIX_FMT_YUVA444P10

152 : AV_PIX_FMT_YUV444P10;

153 break;

154 default:

155 av_log(avctx, AV_LOG_ERROR,

156 "unsupported picture format: %d\n", ctx->pic_format);

157 return AVERROR_INVALIDDATA;

158 }

159

160 if (ctx->scantable_type != ctx->frame_type) {

161 if (!ctx->frame_type)

162 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable,

163 ff_prores_progressive_scan);

164 else

165 ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable,

166 ff_prores_interlaced_scan);

167 ctx->scantable_type = ctx->frame_type;

168 }

169

170 if (ctx->frame_type) { /* if interlaced */

171 ctx->frame->interlaced_frame = 1;

172 ctx->frame->top_field_first = ctx->frame_type & 1;

173 } else {

174 ctx->frame->interlaced_frame = 0;

175 }

176

177 avctx->color_primaries = buf[14];

178 avctx->color_trc = buf[15];

179 avctx->colorspace = buf[16];

180

181 ctx->qmat_changed = 0;

182 ptr = buf + 20;

183 flags = buf[19];

184 if (flags & 2) {

185 if (ptr - buf > hdr_size - 64) {

186 av_log(avctx, AV_LOG_ERROR, "header data too small\n");

187 return AVERROR_INVALIDDATA;

188 }

189 if (memcmp(ctx->qmat_luma, ptr, 64)) {

190 memcpy(ctx->qmat_luma, ptr, 64);

191 ctx->qmat_changed = 1;

192 }

193 ptr += 64;

194 } else {

195 memset(ctx->qmat_luma, 4, 64);

196 ctx->qmat_changed = 1;

197 }

198

199 if (flags & 1) {

200 if (ptr - buf > hdr_size - 64) {

201 av_log(avctx, AV_LOG_ERROR, "header data too small\n");

202 return -1;

203 }

204 if (memcmp(ctx->qmat_chroma, ptr, 64)) {

205 memcpy(ctx->qmat_chroma, ptr, 64);

206 ctx->qmat_changed = 1;

207 }

208 } else {

209 memset(ctx->qmat_chroma, 4, 64);

210 ctx->qmat_changed = 1;

211 }

212

213 return hdr_size;

214 }

215

216

217 static int decode_picture_header(ProresContext *ctx, const uint8_t *buf,

218 const int data_size, AVCodecContext *avctx)

219 {

220 int i, hdr_size, pic_data_size, num_slices;

221 int slice_width_factor, slice_height_factor;

222 int remainder, num_x_slices;

223 const uint8_t *data_ptr, *index_ptr;

224

225 hdr_size = data_size > 0 ? buf[0] >> 3 : 0;

226 if (hdr_size < 8 || hdr_size > data_size) {

227 av_log(avctx, AV_LOG_ERROR, "picture header too small\n");

228 return AVERROR_INVALIDDATA;

229 }

230

231 pic_data_size = AV_RB32(buf + 1);

232 if (pic_data_size > data_size) {

233 av_log(avctx, AV_LOG_ERROR, "picture data too small\n");

234 return AVERROR_INVALIDDATA;

235 }

236

237 slice_width_factor = buf[7] >> 4;

238 slice_height_factor = buf[7] & 0xF;

239 if (slice_width_factor > 3 || slice_height_factor) {

240 av_log(avctx, AV_LOG_ERROR,

241 "unsupported slice dimension: %d x %d\n",

242 1 << slice_width_factor, 1 << slice_height_factor);

243 return AVERROR_INVALIDDATA;

244 }

245

246 ctx->slice_width_factor = slice_width_factor;

247 ctx->slice_height_factor = slice_height_factor;

248

249 ctx->num_x_mbs = (avctx->width + 15) >> 4;

250 ctx->num_y_mbs = (avctx->height +

251 (1 << (4 + ctx->frame->interlaced_frame)) - 1) >>

252 (4 + ctx->frame->interlaced_frame);

253

254 remainder = ctx->num_x_mbs & ((1 << slice_width_factor) - 1);

255 num_x_slices = (ctx->num_x_mbs >> slice_width_factor) + (remainder & 1) +

256 ((remainder >> 1) & 1) + ((remainder >> 2) & 1);

257

258 num_slices = num_x_slices * ctx->num_y_mbs;

259 if (num_slices != AV_RB16(buf + 5)) {

260 av_log(avctx, AV_LOG_ERROR, "invalid number of slices\n");

261 return AVERROR_INVALIDDATA;

262 }

263

264 if (ctx->total_slices != num_slices) {

265 av_freep(&ctx->slice_data);

266 ctx->slice_data = av_malloc((num_slices + 1) * sizeof(ctx->slice_data[0]));

267 if (!ctx->slice_data)

268 return AVERROR(ENOMEM);

269 ctx->total_slices = num_slices;

270 }

271

272 if (hdr_size + num_slices * 2 > data_size) {

273 av_log(avctx, AV_LOG_ERROR, "slice table too small\n");

274 return AVERROR_INVALIDDATA;

275 }

276

277 /* parse slice table allowing quick access to the slice data */

278 index_ptr = buf + hdr_size;

279 data_ptr = index_ptr + num_slices * 2;

280

281 for (i = 0; i < num_slices; i++) {

282 ctx->slice_data[i].index = data_ptr;

283 ctx->slice_data[i].prev_slice_sf = 0;

284 data_ptr += AV_RB16(index_ptr + i * 2);

285 }

286 ctx->slice_data[i].index = data_ptr;

287 ctx->slice_data[i].prev_slice_sf = 0;

288

289 if (data_ptr > buf + data_size) {

290 av_log(avctx, AV_LOG_ERROR, "out of slice data\n");

291 return -1;

292 }

293

294 return pic_data_size;

295 }

296

297

298 /**

299 * Read an unsigned rice/exp golomb codeword.

300 */

301 static inline int decode_vlc_codeword(GetBitContext *gb, unsigned codebook)

302 {

303 unsigned int rice_order, exp_order, switch_bits;

304 unsigned int buf, code;

305 int log, prefix_len, len;

306

307 OPEN_READER(re, gb);

308 UPDATE_CACHE(re, gb);

309 buf = GET_CACHE(re, gb);

310

311 /* number of prefix bits to switch between Rice and expGolomb */

312 switch_bits = (codebook & 3) + 1;

313 rice_order = codebook >> 5; /* rice code order */

314 exp_order = (codebook >> 2) & 7; /* exp golomb code order */

315

316 log = 31 - av_log2(buf); /* count prefix bits (zeroes) */

317

318 if (log < switch_bits) { /* ok, we got a rice code */

319 if (!rice_order) {

320 /* shortcut for faster decoding of rice codes without remainder */

321 code = log;

322 LAST_SKIP_BITS(re, gb, log + 1);

323 } else {

324 prefix_len = log + 1;

325 code = (log << rice_order) + NEG_USR32(buf << prefix_len, rice_order);

326 LAST_SKIP_BITS(re, gb, prefix_len + rice_order);

327 }

328 } else { /* otherwise we got a exp golomb code */

329 len = (log << 1) - switch_bits + exp_order + 1;

330 code = NEG_USR32(buf, len) - (1 << exp_order) + (switch_bits << rice_order);

331 LAST_SKIP_BITS(re, gb, len);

332 }

333

334 CLOSE_READER(re, gb);

335

336 return code;

337 }

338

339 #define LSB2SIGN(x) (-((x) & 1))

340 #define TOSIGNED(x) (((x) >> 1) ^ LSB2SIGN(x))

341

342 /**

343 * Decode DC coefficients for all blocks in a slice.

344 */

345 static inline void decode_dc_coeffs(GetBitContext *gb, int16_t *out,

346 int nblocks)

347 {

348 int16_t prev_dc;

349 int i, sign;

350 int16_t delta;

351 unsigned int code;

352

353 code = decode_vlc_codeword(gb, FIRST_DC_CB);

354 out[0] = prev_dc = TOSIGNED(code);

355

356 out += 64; /* move to the DC coeff of the next block */

357 delta = 3;

358

359 for (i = 1; i < nblocks; i++, out += 64) {

360 code = decode_vlc_codeword(gb, ff_prores_dc_codebook[FFMIN(FFABS(delta), 3)]);

361

362 sign = -(((delta >> 15) & 1) ^ (code & 1));

363 delta = (((code + 1) >> 1) ^ sign) - sign;

364 prev_dc += delta;

365 out[0] = prev_dc;

366 }

367 }

368

369

370 /**

371 * Decode AC coefficients for all blocks in a slice.

372 */

373 static inline int decode_ac_coeffs(GetBitContext *gb, int16_t *out,

374 int blocks_per_slice,

375 int plane_size_factor,

376 const uint8_t *scan)

377 {

378 int pos, block_mask, run, level, sign, run_cb_index, lev_cb_index;

379 int max_coeffs, bits_left;

380

381 /* set initial prediction values */

382 run = 4;

383 level = 2;

384

385 max_coeffs = blocks_per_slice << 6;

386 block_mask = blocks_per_slice - 1;

387

388 for (pos = blocks_per_slice - 1; pos < max_coeffs;) {

389 run_cb_index = ff_prores_run_to_cb_index[FFMIN(run, 15)];

390 lev_cb_index = ff_prores_lev_to_cb_index[FFMIN(level, 9)];

391

392 bits_left = get_bits_left(gb);

393 if (bits_left <= 0 || (bits_left <= 8 && !show_bits(gb, bits_left)))

394 return 0;

395

396 run = decode_vlc_codeword(gb, ff_prores_ac_codebook[run_cb_index]);

397 if (run < 0)

398 return AVERROR_INVALIDDATA;

399

400 bits_left = get_bits_left(gb);

401 if (bits_left <= 0 || (bits_left <= 8 && !show_bits(gb, bits_left)))

402 return AVERROR_INVALIDDATA;

403

404 level = decode_vlc_codeword(gb, ff_prores_ac_codebook[lev_cb_index]) + 1;

405 if (level < 0)

406 return AVERROR_INVALIDDATA;

407

408 pos += run + 1;

409 if (pos >= max_coeffs)

410 break;

411

412 sign = get_sbits(gb, 1);

413 out[((pos & block_mask) << 6) + scan[pos >> plane_size_factor]] =

414 (level ^ sign) - sign;

415 }

416

417 return 0;

418 }

419

420

421 /**

422 * Decode a slice plane (luma or chroma).

423 */

424 static int decode_slice_plane(ProresContext *ctx, ProresThreadData *td,

425 const uint8_t *buf,

426 int data_size, uint16_t *out_ptr,

427 int linesize, int mbs_per_slice,

428 int blocks_per_mb, int plane_size_factor,

429 const int16_t *qmat, int is_chroma)

430 {

431 GetBitContext gb;

432 int16_t *block_ptr;

433 int mb_num, blocks_per_slice, ret;

434

435 blocks_per_slice = mbs_per_slice * blocks_per_mb;

436

437 memset(td->blocks, 0, 8 * 4 * 64 * sizeof(*td->blocks));

438

439 init_get_bits(&gb, buf, data_size << 3);

440

441 decode_dc_coeffs(&gb, td->blocks, blocks_per_slice);

442

443 ret = decode_ac_coeffs(&gb, td->blocks, blocks_per_slice,

444 plane_size_factor, ctx->scantable.permutated);

445 if (ret < 0)

446 return ret;

447

448 /* inverse quantization, inverse transform and output */

449 block_ptr = td->blocks;

450

451 if (!is_chroma) {

452 for (mb_num = 0; mb_num < mbs_per_slice; mb_num++, out_ptr += blocks_per_mb * 4) {

453 ctx->dsp.idct_put(out_ptr, linesize, block_ptr, qmat);

454 block_ptr += 64;

455 if (blocks_per_mb > 2) {

456 ctx->dsp.idct_put(out_ptr + 8, linesize, block_ptr, qmat);

457 block_ptr += 64;

458 }

459 ctx->dsp.idct_put(out_ptr + linesize * 4, linesize, block_ptr, qmat);

460 block_ptr += 64;

461 if (blocks_per_mb > 2) {

462 ctx->dsp.idct_put(out_ptr + linesize * 4 + 8, linesize, block_ptr, qmat);

463 block_ptr += 64;

464 }

465 }

466 } else {

467 for (mb_num = 0; mb_num < mbs_per_slice; mb_num++, out_ptr += blocks_per_mb * 4) {

468 ctx->dsp.idct_put(out_ptr, linesize, block_ptr, qmat);

469 block_ptr += 64;

470 ctx->dsp.idct_put(out_ptr + linesize * 4, linesize, block_ptr, qmat);

471 block_ptr += 64;

472 if (blocks_per_mb > 2) {

473 ctx->dsp.idct_put(out_ptr + 8, linesize, block_ptr, qmat);

474 block_ptr += 64;

475 ctx->dsp.idct_put(out_ptr + linesize * 4 + 8, linesize, block_ptr, qmat);

476 block_ptr += 64;

477 }

478 }

479 }

480 return 0;

481 }

482

483

484 static void unpack_alpha(GetBitContext *gb, uint16_t *dst, int num_coeffs,

485 const int num_bits)

486 {

487 const int mask = (1 << num_bits) - 1;

488 int i, idx, val, alpha_val;

489

490 idx = 0;

491 alpha_val = mask;

492 do {

493 do {

494 if (get_bits1(gb))

495 val = get_bits(gb, num_bits);

496 else {

497 int sign;

498 val = get_bits(gb, num_bits == 16 ? 7 : 4);

499 sign = val & 1;

500 val = (val + 2) >> 1;

501 if (sign)

502 val = -val;

503 }

504 alpha_val = (alpha_val + val) & mask;

505 if (num_bits == 16)

506 dst[idx++] = alpha_val >> 6;

507 else

508 dst[idx++] = (alpha_val << 2) | (alpha_val >> 6);

509 if (idx >= num_coeffs) {

510 break;

511 }

512 } while (get_bits1(gb));

513 val = get_bits(gb, 4);

514 if (!val)

515 val = get_bits(gb, 11);

516 if (idx + val > num_coeffs)

517 val = num_coeffs - idx;

518 if (num_bits == 16)

519 for (i = 0; i < val; i++)

520 dst[idx++] = alpha_val >> 6;

521 else

522 for (i = 0; i < val; i++)

523 dst[idx++] = (alpha_val << 2) | (alpha_val >> 6);

524 } while (idx < num_coeffs);

525 }

526

527 /**

528 * Decode alpha slice plane.

529 */

530 static void decode_alpha_plane(ProresContext *ctx, ProresThreadData *td,

531 const uint8_t *buf, int data_size,

532 uint16_t *out_ptr, int linesize,

533 int mbs_per_slice)

534 {

535 GetBitContext gb;

536 int i;

537 uint16_t *block_ptr;

538

539 memset(td->blocks, 0, 8 * 4 * 64 * sizeof(*td->blocks));

540

541 init_get_bits(&gb, buf, data_size << 3);

542

543 if (ctx->alpha_info == 2)

544 unpack_alpha(&gb, td->blocks, mbs_per_slice * 4 * 64, 16);

545 else

546 unpack_alpha(&gb, td->blocks, mbs_per_slice * 4 * 64, 8);

547

548 block_ptr = td->blocks;

549

550 for (i = 0; i < 16; i++) {

551 memcpy(out_ptr, block_ptr, 16 * mbs_per_slice * sizeof(*out_ptr));

552 out_ptr += linesize >> 1;

553 block_ptr += 16 * mbs_per_slice;

554 }

555 }

556

557 static int decode_slice(AVCodecContext *avctx, void *tdata)

558 {

559 ProresThreadData *td = tdata;

560 ProresContext *ctx = avctx->priv_data;

561 int mb_x_pos = td->x_pos;

562 int mb_y_pos = td->y_pos;

563 int pic_num = ctx->pic_num;

564 int slice_num = td->slice_num;

565 int mbs_per_slice = td->slice_width;

566 const uint8_t *buf;

567 uint8_t *y_data, *u_data, *v_data, *a_data;

568 AVFrame *pic = ctx->frame;

569 int i, sf, slice_width_factor;

570 int slice_data_size, hdr_size;

571 int y_data_size, u_data_size, v_data_size, a_data_size;

572 int y_linesize, u_linesize, v_linesize, a_linesize;

573 int coff[4];

574 int ret;

575

576 buf = ctx->slice_data[slice_num].index;

577 slice_data_size = ctx->slice_data[slice_num + 1].index - buf;

578

579 slice_width_factor = av_log2(mbs_per_slice);

580

581 y_data = pic->data[0];

582 u_data = pic->data[1];

583 v_data = pic->data[2];

584 a_data = pic->data[3];

585 y_linesize = pic->linesize[0];

586 u_linesize = pic->linesize[1];

587 v_linesize = pic->linesize[2];

588 a_linesize = pic->linesize[3];

589

590 if (pic->interlaced_frame) {

591 if (!(pic_num ^ pic->top_field_first)) {

592 y_data += y_linesize;

593 u_data += u_linesize;

594 v_data += v_linesize;

595 if (a_data)

596 a_data += a_linesize;

597 }

598 y_linesize <<= 1;

599 u_linesize <<= 1;

600 v_linesize <<= 1;

601 a_linesize <<= 1;

602 }

603 y_data += (mb_y_pos << 4) * y_linesize + (mb_x_pos << 5);

604 u_data += (mb_y_pos << 4) * u_linesize + (mb_x_pos << ctx->mb_chroma_factor);

605 v_data += (mb_y_pos << 4) * v_linesize + (mb_x_pos << ctx->mb_chroma_factor);

606 if (a_data)

607 a_data += (mb_y_pos << 4) * a_linesize + (mb_x_pos << 5);

608

609 if (slice_data_size < 6) {

610 av_log(avctx, AV_LOG_ERROR, "slice data too small\n");

611 return AVERROR_INVALIDDATA;

612 }

613

614 /* parse slice header */

615 hdr_size = buf[0] >> 3;

616 coff[0] = hdr_size;

617 y_data_size = AV_RB16(buf + 2);

618 coff[1] = coff[0] + y_data_size;

619 u_data_size = AV_RB16(buf + 4);

620 coff[2] = coff[1] + u_data_size;

621 v_data_size = hdr_size > 7 ? AV_RB16(buf + 6) : slice_data_size - coff[2];

622 coff[3] = coff[2] + v_data_size;

623 a_data_size = ctx->alpha_info ? slice_data_size - coff[3] : 0;

624

625 /* if V or alpha component size is negative that means that previous

626 component sizes are too large */

627 if (v_data_size < 0 || a_data_size < 0 || hdr_size < 6) {

628 av_log(avctx, AV_LOG_ERROR, "invalid data size\n");

629 return AVERROR_INVALIDDATA;

630 }

631

632 sf = av_clip(buf[1], 1, 224);

633 sf = sf > 128 ? (sf - 96) << 2 : sf;

634

635 /* scale quantization matrixes according with slice's scale factor */

636 /* TODO: this can be SIMD-optimized a lot */

637 if (ctx->qmat_changed || sf != td->prev_slice_sf) {

638 td->prev_slice_sf = sf;

639 for (i = 0; i < 64; i++) {

640 td->qmat_luma_scaled[ctx->dsp.idct_permutation[i]] = ctx->qmat_luma[i] * sf;

641 td->qmat_chroma_scaled[ctx->dsp.idct_permutation[i]] = ctx->qmat_chroma[i] * sf;

642 }

643 }

644

645 /* decode luma plane */

646 ret = decode_slice_plane(ctx, td, buf + coff[0], y_data_size,

647 (uint16_t*) y_data, y_linesize,

648 mbs_per_slice, 4, slice_width_factor + 2,

649 td->qmat_luma_scaled, 0);

650

651 if (ret < 0)

652 return ret;

653

654 /* decode U chroma plane */

655 ret = decode_slice_plane(ctx, td, buf + coff[1], u_data_size,

656 (uint16_t*) u_data, u_linesize,

657 mbs_per_slice, ctx->num_chroma_blocks,

658 slice_width_factor + ctx->chroma_factor - 1,

659 td->qmat_chroma_scaled, 1);

660 if (ret < 0)

661 return ret;

662

663 /* decode V chroma plane */

664 ret = decode_slice_plane(ctx, td, buf + coff[2], v_data_size,

665 (uint16_t*) v_data, v_linesize,

666 mbs_per_slice, ctx->num_chroma_blocks,

667 slice_width_factor + ctx->chroma_factor - 1,

668 td->qmat_chroma_scaled, 1);

669 if (ret < 0)

670 return ret;

671

672 /* decode alpha plane if available */

673 if (a_data && a_data_size)

674 decode_alpha_plane(ctx, td, buf + coff[3], a_data_size,

675 (uint16_t*) a_data, a_linesize,

676 mbs_per_slice);

677

678 return 0;

679 }

680

681

682 static int decode_picture(ProresContext *ctx, int pic_num,

683 AVCodecContext *avctx)

684 {

685 int slice_num, slice_width, x_pos, y_pos;

686

687 slice_num = 0;

688

689 ctx->pic_num = pic_num;

690 for (y_pos = 0; y_pos < ctx->num_y_mbs; y_pos++) {

691 slice_width = 1 << ctx->slice_width_factor;

692

693 for (x_pos = 0; x_pos < ctx->num_x_mbs && slice_width;

694 x_pos += slice_width) {

695 while (ctx->num_x_mbs - x_pos < slice_width)

696 slice_width >>= 1;

697

698 ctx->slice_data[slice_num].slice_num = slice_num;

699 ctx->slice_data[slice_num].x_pos = x_pos;

700 ctx->slice_data[slice_num].y_pos = y_pos;

701 ctx->slice_data[slice_num].slice_width = slice_width;

702

703 slice_num++;

704 }

705 }

706

707 return avctx->execute(avctx, decode_slice,

708 ctx->slice_data, NULL, slice_num,

709 sizeof(ctx->slice_data[0]));

710 }

711

712

713 #define MOVE_DATA_PTR(nbytes) buf += (nbytes); buf_size -= (nbytes)

714

715 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

716 AVPacket *avpkt)

717 {

718 ProresContext *ctx = avctx->priv_data;

719 const uint8_t *buf = avpkt->data;

720 int buf_size = avpkt->size;

721 int frame_hdr_size, pic_num, pic_data_size;

722

723 ctx->frame = data;

724 ctx->frame->pict_type = AV_PICTURE_TYPE_I;

725 ctx->frame->key_frame = 1;

726

727 /* check frame atom container */

728 if (buf_size < 28 || buf_size < AV_RB32(buf) ||

729 AV_RB32(buf + 4) != FRAME_ID) {

730 av_log(avctx, AV_LOG_ERROR, "invalid frame\n");

731 return AVERROR_INVALIDDATA;

732 }

733

734 MOVE_DATA_PTR(8);

735

736 frame_hdr_size = decode_frame_header(ctx, buf, buf_size, avctx);

737 if (frame_hdr_size < 0)

738 return AVERROR_INVALIDDATA;

739

740 MOVE_DATA_PTR(frame_hdr_size);

741

742 if (ff_get_buffer(avctx, ctx->frame, 0) < 0)

743 return -1;

744

745 for (pic_num = 0; ctx->frame->interlaced_frame - pic_num + 1; pic_num++) {

746 pic_data_size = decode_picture_header(ctx, buf, buf_size, avctx);

747 if (pic_data_size < 0)

748 return AVERROR_INVALIDDATA;

749

750 if (decode_picture(ctx, pic_num, avctx))

751 return -1;

752

753 MOVE_DATA_PTR(pic_data_size);

754 }

755

756 ctx->frame = NULL;

757 *got_frame = 1;

758

759 return avpkt->size;

760 }

761

762

763 static av_cold int decode_close(AVCodecContext *avctx)

764 {

765 ProresContext *ctx = avctx->priv_data;

766

767 av_freep(&ctx->slice_data);

768

769 return 0;

770 }

771

772

773 AVCodec ff_prores_lgpl_decoder = {

774 .name = "prores_lgpl",

775 .long_name = NULL_IF_CONFIG_SMALL("Apple ProRes (iCodec Pro)"),

776 .type = AVMEDIA_TYPE_VIDEO,

777 .id = AV_CODEC_ID_PRORES,

778 .priv_data_size = sizeof(ProresContext),

779 .init = decode_init,

780 .close = decode_close,

781 .decode = decode_frame,

782 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS,

783 };

Generated on Sat Jan 25 2014 19:51:53 for FFmpeg by doxygen 1.8.2