FFmpeg: libavcodec/ffv1dec.c Source File

FFmpeg

[フレーム]

libavcodec

ffv1dec.c

Go to the documentation of this file.

1 /*

2 * FFV1 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 * FF Video Codec 1 (a lossless codec) decoder

26 */

28 #include "libavutil/avassert.h"

29 #include "libavutil/crc.h"

30 #include "libavutil/opt.h"

31 #include "libavutil/imgutils.h"

32 #include "libavutil/pixdesc.h"

33 #include "libavutil/timer.h"

34 #include "avcodec.h"

35 #include "internal.h"

36 #include "get_bits.h"

37 #include "rangecoder.h"

38 #include "golomb.h"

39 #include "mathops.h"

40 #include "ffv1.h"

42 static inline av_flatten int get_symbol_inline(RangeCoder *c, uint8_t *state,

43 int is_signed)

44 {

45 if (get_rac(c, state + 0))

46 return 0;

47 else {

48 int i, e, a;

49 e = 0;

50 while (get_rac(c, state + 1 + FFMIN(e, 9))) // 1..10

51 e++;

53 a = 1;

54 for (i = e - 1; i >= 0; i--)

55 a += a + get_rac(c, state + 22 + FFMIN(i, 9)); // 22..31

57 e = -(is_signed && get_rac(c, state + 11 + FFMIN(e, 10))); // 11..21

58 return (a ^ e) - e;

59 }

60 }

62 static av_noinline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed)

63 {

64 return get_symbol_inline(c, state, is_signed);

65 }

67 static inline int get_vlc_symbol(GetBitContext *gb, VlcState *const state,

68 int bits)

69 {

70 int k, i, v, ret;

72 i = state->count;

73 k = 0;

74 while (i < state->error_sum) { // FIXME: optimize

75 k++;

76 i += i;

77 }

79 v = get_sr_golomb(gb, k, 12, bits);

80 av_dlog(NULL, "v:%d bias:%d error:%d drift:%d count:%d k:%d",

81 v, state->bias, state->error_sum, state->drift, state->count, k);

83 #if 0 // JPEG LS

84 if (k == 0 && 2 * state->drift <= -state->count)

85 v ^= (-1);

86 #else

87 v ^= ((2 * state->drift + state->count) >> 31);

88 #endif

90 ret = fold(v + state->bias, bits);

92 update_vlc_state(state, v);

94 return ret;

95 }

97 static av_always_inline void decode_line(FFV1Context *s, int w,

98 int16_t *sample[2],

99 int plane_index, int bits)

100 {

101 PlaneContext *const p = &s->plane[plane_index];

102 RangeCoder *const c = &s->c;

103 int x;

104 int run_count = 0;

105 int run_mode = 0;

106 int run_index = s->run_index;

107

108 if (s->slice_coding_mode == 1) {

109 int i;

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

111 int v = 0;

112 for (i=0; i<bits; i++) {

113 uint8_t state = 128;

114 v += v + get_rac(c, &state);

115 }

116 sample[1][x] = v;

117 }

118 return;

119 }

120

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

122 int diff, context, sign;

123

124 context = get_context(p, sample[1] + x, sample[0] + x, sample[1] + x);

125 if (context < 0) {

126 context = -context;

127 sign = 1;

128 } else

129 sign = 0;

130

131 av_assert2(context < p->context_count);

132

133 if (s->ac) {

134 diff = get_symbol_inline(c, p->state[context], 1);

135 } else {

136 if (context == 0 && run_mode == 0)

137 run_mode = 1;

138

139 if (run_mode) {

140 if (run_count == 0 && run_mode == 1) {

141 if (get_bits1(&s->gb)) {

142 run_count = 1 << ff_log2_run[run_index];

143 if (x + run_count <= w)

144 run_index++;

145 } else {

146 if (ff_log2_run[run_index])

147 run_count = get_bits(&s->gb, ff_log2_run[run_index]);

148 else

149 run_count = 0;

150 if (run_index)

151 run_index--;

152 run_mode = 2;

153 }

154 }

155 run_count--;

156 if (run_count < 0) {

157 run_mode = 0;

158 run_count = 0;

159 diff = get_vlc_symbol(&s->gb, &p->vlc_state[context],

160 bits);

161 if (diff >= 0)

162 diff++;

163 } else

164 diff = 0;

165 } else

166 diff = get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);

167

168 av_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n",

169 run_count, run_index, run_mode, x, get_bits_count(&s->gb));

170 }

171

172 if (sign)

173 diff = -diff;

174

175 sample[1][x] = (predict(sample[1] + x, sample[0] + x) + diff) &

176 ((1 << bits) - 1);

177 }

178 s->run_index = run_index;

179 }

180

181 static void decode_plane(FFV1Context *s, uint8_t *src,

182 int w, int h, int stride, int plane_index)

183 {

184 int x, y;

185 int16_t *sample[2];

186 sample[0] = s->sample_buffer + 3;

187 sample[1] = s->sample_buffer + w + 6 + 3;

188

189 s->run_index = 0;

190

191 memset(s->sample_buffer, 0, 2 * (w + 6) * sizeof(*s->sample_buffer));

192

193 for (y = 0; y < h; y++) {

194 int16_t *temp = sample[0]; // FIXME: try a normal buffer

195

196 sample[0] = sample[1];

197 sample[1] = temp;

198

199 sample[1][-1] = sample[0][0];

200 sample[0][w] = sample[0][w - 1];

201

202 // { START_TIMER

203 if (s->avctx->bits_per_raw_sample <= 8) {

204 decode_line(s, w, sample, plane_index, 8);

205 for (x = 0; x < w; x++)

206 src[x + stride * y] = sample[1][x];

207 } else {

208 decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);

209 if (s->packed_at_lsb) {

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

211 ((uint16_t*)(src + stride*y))[x] = sample[1][x];

212 }

213 } else {

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

215 ((uint16_t*)(src + stride*y))[x] = sample[1][x] << (16 - s->avctx->bits_per_raw_sample);

216 }

217 }

218 }

219 // STOP_TIMER("decode-line") }

220 }

221 }

222

223 static void decode_rgb_frame(FFV1Context *s, uint8_t *src[3], int w, int h, int stride[3])

224 {

225 int x, y, p;

226 int16_t *sample[4][2];

227 int lbd = s->avctx->bits_per_raw_sample <= 8;

228 int bits = s->avctx->bits_per_raw_sample > 0 ? s->avctx->bits_per_raw_sample : 8;

229 int offset = 1 << bits;

230

231 for (x = 0; x < 4; x++) {

232 sample[x][0] = s->sample_buffer + x * 2 * (w + 6) + 3;

233 sample[x][1] = s->sample_buffer + (x * 2 + 1) * (w + 6) + 3;

234 }

235

236 s->run_index = 0;

237

238 memset(s->sample_buffer, 0, 8 * (w + 6) * sizeof(*s->sample_buffer));

239

240 for (y = 0; y < h; y++) {

241 for (p = 0; p < 3 + s->transparency; p++) {

242 int16_t *temp = sample[p][0]; // FIXME: try a normal buffer

243

244 sample[p][0] = sample[p][1];

245 sample[p][1] = temp;

246

247 sample[p][1][-1]= sample[p][0][0 ];

248 sample[p][0][ w]= sample[p][0][w-1];

249 if (lbd && s->slice_coding_mode == 0)

250 decode_line(s, w, sample[p], (p + 1)/2, 9);

251 else

252 decode_line(s, w, sample[p], (p + 1)/2, bits + (s->slice_coding_mode != 1));

253 }

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

255 int g = sample[0][1][x];

256 int b = sample[1][1][x];

257 int r = sample[2][1][x];

258 int a = sample[3][1][x];

259

260 if (s->slice_coding_mode != 1) {

261 b -= offset;

262 r -= offset;

263 g -= (b * s->slice_rct_by_coef + r * s->slice_rct_ry_coef) >> 2;

264 b += g;

265 r += g;

266 }

267

268 if (lbd)

269 *((uint32_t*)(src[0] + x*4 + stride[0]*y)) = b + (g<<8) + (r<<16) + (a<<24);

270 else {

271 *((uint16_t*)(src[0] + x*2 + stride[0]*y)) = b;

272 *((uint16_t*)(src[1] + x*2 + stride[1]*y)) = g;

273 *((uint16_t*)(src[2] + x*2 + stride[2]*y)) = r;

274 }

275 }

276 }

277 }

278

279 static int decode_slice_header(FFV1Context *f, FFV1Context *fs)

280 {

281 RangeCoder *c = &fs->c;

282 uint8_t state[CONTEXT_SIZE];

283 unsigned ps, i, context_count;

284 memset(state, 128, sizeof(state));

285

286 av_assert0(f->version > 2);

287

288 fs->slice_x = get_symbol(c, state, 0) * f->width ;

289 fs->slice_y = get_symbol(c, state, 0) * f->height;

290 fs->slice_width = (get_symbol(c, state, 0) + 1) * f->width + fs->slice_x;

291 fs->slice_height = (get_symbol(c, state, 0) + 1) * f->height + fs->slice_y;

292

293 fs->slice_x /= f->num_h_slices;

294 fs->slice_y /= f->num_v_slices;

295 fs->slice_width = fs->slice_width /f->num_h_slices - fs->slice_x;

296 fs->slice_height = fs->slice_height/f->num_v_slices - fs->slice_y;

297 if ((unsigned)fs->slice_width > f->width || (unsigned)fs->slice_height > f->height)

298 return -1;

299 if ( (unsigned)fs->slice_x + (uint64_t)fs->slice_width > f->width

300 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)

301 return -1;

302

303 for (i = 0; i < f->plane_count; i++) {

304 PlaneContext * const p = &fs->plane[i];

305 int idx = get_symbol(c, state, 0);

306 if (idx > (unsigned)f->quant_table_count) {

307 av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");

308 return -1;

309 }

310 p->quant_table_index = idx;

311 memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table));

312 context_count = f->context_count[idx];

313

314 if (p->context_count < context_count) {

315 av_freep(&p->state);

316 av_freep(&p->vlc_state);

317 }

318 p->context_count = context_count;

319 }

320

321 ps = get_symbol(c, state, 0);

322 if (ps == 1) {

323 f->cur->interlaced_frame = 1;

324 f->cur->top_field_first = 1;

325 } else if (ps == 2) {

326 f->cur->interlaced_frame = 1;

327 f->cur->top_field_first = 0;

328 } else if (ps == 3) {

329 f->cur->interlaced_frame = 0;

330 }

331 f->cur->sample_aspect_ratio.num = get_symbol(c, state, 0);

332 f->cur->sample_aspect_ratio.den = get_symbol(c, state, 0);

333

334 if (av_image_check_sar(f->width, f->height,

335 f->cur->sample_aspect_ratio) < 0) {

336 av_log(f->avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",

337 f->cur->sample_aspect_ratio.num,

338 f->cur->sample_aspect_ratio.den);

339 f->cur->sample_aspect_ratio = (AVRational){ 0, 1 };

340 }

341

342 if (fs->version > 3) {

343 fs->slice_reset_contexts = get_rac(c, state);

344 fs->slice_coding_mode = get_symbol(c, state, 0);

345 if (fs->slice_coding_mode != 1) {

346 fs->slice_rct_by_coef = get_symbol(c, state, 0);

347 fs->slice_rct_ry_coef = get_symbol(c, state, 0);

348 if ((uint64_t)fs->slice_rct_by_coef + (uint64_t)fs->slice_rct_ry_coef > 4) {

349 av_log(f->avctx, AV_LOG_ERROR, "slice_rct_y_coef out of range\n");

350 return AVERROR_INVALIDDATA;

351 }

352 }

353 }

354

355 return 0;

356 }

357

358 static int decode_slice(AVCodecContext *c, void *arg)

359 {

360 FFV1Context *fs = *(void **)arg;

361 FFV1Context *f = fs->avctx->priv_data;

362 int width, height, x, y, ret;

363 const int ps = av_pix_fmt_desc_get(c->pix_fmt)->comp[0].step_minus1 + 1;

364 AVFrame * const p = f->cur;

365 int i, si;

366

367 for( si=0; fs != f->slice_context[si]; si ++)

368 ;

369

370 if(f->fsrc && !p->key_frame)

371 ff_thread_await_progress(&f->last_picture, si, 0);

372

373 if(f->fsrc && !p->key_frame) {

374 FFV1Context *fssrc = f->fsrc->slice_context[si];

375 FFV1Context *fsdst = f->slice_context[si];

376 av_assert1(fsdst->plane_count == fssrc->plane_count);

377 av_assert1(fsdst == fs);

378

379 if (!p->key_frame)

380 fsdst->slice_damaged |= fssrc->slice_damaged;

381

382 for (i = 0; i < f->plane_count; i++) {

383 PlaneContext *psrc = &fssrc->plane[i];

384 PlaneContext *pdst = &fsdst->plane[i];

385

386 av_free(pdst->state);

387 av_free(pdst->vlc_state);

388 memcpy(pdst, psrc, sizeof(*pdst));

389 pdst->state = NULL;

390 pdst->vlc_state = NULL;

391

392 if (fssrc->ac) {

393 pdst->state = av_malloc_array(CONTEXT_SIZE, psrc->context_count);

394 memcpy(pdst->state, psrc->state, CONTEXT_SIZE * psrc->context_count);

395 } else {

396 pdst->vlc_state = av_malloc_array(sizeof(*pdst->vlc_state), psrc->context_count);

397 memcpy(pdst->vlc_state, psrc->vlc_state, sizeof(*pdst->vlc_state) * psrc->context_count);

398 }

399 }

400 }

401

402 fs->slice_rct_by_coef = 1;

403 fs->slice_rct_ry_coef = 1;

404

405 if (f->version > 2) {

406 if (ffv1_init_slice_state(f, fs) < 0)

407 return AVERROR(ENOMEM);

408 if (decode_slice_header(f, fs) < 0) {

409 fs->slice_damaged = 1;

410 return AVERROR_INVALIDDATA;

411 }

412 }

413 if ((ret = ffv1_init_slice_state(f, fs)) < 0)

414 return ret;

415 if (f->cur->key_frame || fs->slice_reset_contexts)

416 ffv1_clear_slice_state(f, fs);

417

418 width = fs->slice_width;

419 height = fs->slice_height;

420 x = fs->slice_x;

421 y = fs->slice_y;

422

423 if (!fs->ac) {

424 if (f->version == 3 && f->micro_version > 1 || f->version > 3)

425 get_rac(&fs->c, (uint8_t[]) { 129 });

426 fs->ac_byte_count = f->version > 2 || (!x && !y) ? fs->c.bytestream - fs->c.bytestream_start - 1 : 0;

427 init_get_bits(&fs->gb,

428 fs->c.bytestream_start + fs->ac_byte_count,

429 (fs->c.bytestream_end - fs->c.bytestream_start - fs->ac_byte_count) * 8);

430 }

431

432 av_assert1(width && height);

433 if (f->colorspace == 0) {

434 const int chroma_width = FF_CEIL_RSHIFT(width, f->chroma_h_shift);

435 const int chroma_height = FF_CEIL_RSHIFT(height, f->chroma_v_shift);

436 const int cx = x >> f->chroma_h_shift;

437 const int cy = y >> f->chroma_v_shift;

438 decode_plane(fs, p->data[0] + ps*x + y*p->linesize[0], width, height, p->linesize[0], 0);

439

440 if (f->chroma_planes) {

441 decode_plane(fs, p->data[1] + ps*cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);

442 decode_plane(fs, p->data[2] + ps*cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1);

443 }

444 if (fs->transparency)

445 decode_plane(fs, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], 2);

446 } else {

447 uint8_t *planes[3] = { p->data[0] + ps * x + y * p->linesize[0],

448 p->data[1] + ps * x + y * p->linesize[1],

449 p->data[2] + ps * x + y * p->linesize[2] };

450 decode_rgb_frame(fs, planes, width, height, p->linesize);

451 }

452 if (fs->ac && f->version > 2) {

453 int v;

454 get_rac(&fs->c, (uint8_t[]) { 129 });

455 v = fs->c.bytestream_end - fs->c.bytestream - 2 - 5*f->ec;

456 if (v) {

457 av_log(f->avctx, AV_LOG_ERROR, "bytestream end mismatching by %d\n", v);

458 fs->slice_damaged = 1;

459 }

460 }

461

462 emms_c();

463

464 ff_thread_report_progress(&f->picture, si, 0);

465

466 return 0;

467 }

468

469 static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale)

470 {

471 int v;

472 int i = 0;

473 uint8_t state[CONTEXT_SIZE];

474

475 memset(state, 128, sizeof(state));

476

477 for (v = 0; i < 128; v++) {

478 unsigned len = get_symbol(c, state, 0) + 1;

479

480 if (len > 128 - i)

481 return AVERROR_INVALIDDATA;

482

483 while (len--) {

484 quant_table[i] = scale * v;

485 i++;

486 }

487 }

488

489 for (i = 1; i < 128; i++)

490 quant_table[256 - i] = -quant_table[i];

491 quant_table[128] = -quant_table[127];

492

493 return 2 * v - 1;

494 }

495

496 static int read_quant_tables(RangeCoder *c,

497 int16_t quant_table[MAX_CONTEXT_INPUTS][256])

498 {

499 int i;

500 int context_count = 1;

501

502 for (i = 0; i < 5; i++) {

503 context_count *= read_quant_table(c, quant_table[i], context_count);

504 if (context_count > 32768U) {

505 return AVERROR_INVALIDDATA;

506 }

507 }

508 return (context_count + 1) / 2;

509 }

510

511 static int read_extra_header(FFV1Context *f)

512 {

513 RangeCoder *const c = &f->c;

514 uint8_t state[CONTEXT_SIZE];

515 int i, j, k, ret;

516 uint8_t state2[32][CONTEXT_SIZE];

517

518 memset(state2, 128, sizeof(state2));

519 memset(state, 128, sizeof(state));

520

521 ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);

522 ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);

523

524 f->version = get_symbol(c, state, 0);

525 if (f->version < 2) {

526 av_log(f->avctx, AV_LOG_ERROR, "Invalid version in global header\n");

527 return AVERROR_INVALIDDATA;

528 }

529 if (f->version > 2) {

530 c->bytestream_end -= 4;

531 f->micro_version = get_symbol(c, state, 0);

532 }

533 f->ac = f->avctx->coder_type = get_symbol(c, state, 0);

534 if (f->ac > 1) {

535 for (i = 1; i < 256; i++)

536 f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i];

537 }

538

539 f->colorspace = get_symbol(c, state, 0); //YUV cs type

540 f->avctx->bits_per_raw_sample = get_symbol(c, state, 0);

541 f->chroma_planes = get_rac(c, state);

542 f->chroma_h_shift = get_symbol(c, state, 0);

543 f->chroma_v_shift = get_symbol(c, state, 0);

544 f->transparency = get_rac(c, state);

545 f->plane_count = 1 + (f->chroma_planes || f->version<4) + f->transparency;

546 f->num_h_slices = 1 + get_symbol(c, state, 0);

547 f->num_v_slices = 1 + get_symbol(c, state, 0);

548

549 if (f->num_h_slices > (unsigned)f->width || !f->num_h_slices ||

550 f->num_v_slices > (unsigned)f->height || !f->num_v_slices

551 ) {

552 av_log(f->avctx, AV_LOG_ERROR, "slice count invalid\n");

553 return AVERROR_INVALIDDATA;

554 }

555

556 f->quant_table_count = get_symbol(c, state, 0);

557 if (f->quant_table_count > (unsigned)MAX_QUANT_TABLES)

558 return AVERROR_INVALIDDATA;

559

560 for (i = 0; i < f->quant_table_count; i++) {

561 f->context_count[i] = read_quant_tables(c, f->quant_tables[i]);

562 if (f->context_count[i] < 0) {

563 av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

564 return AVERROR_INVALIDDATA;

565 }

566 }

567 if ((ret = ffv1_allocate_initial_states(f)) < 0)

568 return ret;

569

570 for (i = 0; i < f->quant_table_count; i++)

571 if (get_rac(c, state)) {

572 for (j = 0; j < f->context_count[i]; j++)

573 for (k = 0; k < CONTEXT_SIZE; k++) {

574 int pred = j ? f->initial_states[i][j - 1][k] : 128;

575 f->initial_states[i][j][k] =

576 (pred + get_symbol(c, state2[k], 1)) & 0xFF;

577 }

578 }

579

580 if (f->version > 2) {

581 f->ec = get_symbol(c, state, 0);

582 if (f->micro_version > 2)

583 f->intra = get_symbol(c, state, 0);

584 }

585

586 if (f->version > 2) {

587 unsigned v;

588 v = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0,

589 f->avctx->extradata, f->avctx->extradata_size);

590 if (v) {

591 av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!\n", v);

592 return AVERROR_INVALIDDATA;

593 }

594 }

595

596 if (f->avctx->debug & FF_DEBUG_PICT_INFO)

597 av_log(f->avctx, AV_LOG_DEBUG,

598 "global: ver:%d.%d, coder:%d, colorspace: %d bpr:%d chroma:%d(%d:%d), alpha:%d slices:%dx%d qtabs:%d ec:%d intra:%d\n",

599 f->version, f->micro_version,

600 f->ac,

601 f->colorspace,

602 f->avctx->bits_per_raw_sample,

603 f->chroma_planes, f->chroma_h_shift, f->chroma_v_shift,

604 f->transparency,

605 f->num_h_slices, f->num_v_slices,

606 f->quant_table_count,

607 f->ec,

608 f->intra

609 );

610 return 0;

611 }

612

613 static int read_header(FFV1Context *f)

614 {

615 uint8_t state[CONTEXT_SIZE];

616 int i, j, context_count = -1; //-1 to avoid warning

617 RangeCoder *const c = &f->slice_context[0]->c;

618

619 memset(state, 128, sizeof(state));

620

621 if (f->version < 2) {

622 int chroma_planes, chroma_h_shift, chroma_v_shift, transparency, colorspace, bits_per_raw_sample;

623 unsigned v= get_symbol(c, state, 0);

624 if (v >= 2) {

625 av_log(f->avctx, AV_LOG_ERROR, "invalid version %d in ver01 header\n", v);

626 return AVERROR_INVALIDDATA;

627 }

628 f->version = v;

629 f->ac = f->avctx->coder_type = get_symbol(c, state, 0);

630 if (f->ac > 1) {

631 for (i = 1; i < 256; i++)

632 f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i];

633 }

634

635 colorspace = get_symbol(c, state, 0); //YUV cs type

636 bits_per_raw_sample = f->version > 0 ? get_symbol(c, state, 0) : f->avctx->bits_per_raw_sample;

637 chroma_planes = get_rac(c, state);

638 chroma_h_shift = get_symbol(c, state, 0);

639 chroma_v_shift = get_symbol(c, state, 0);

640 transparency = get_rac(c, state);

641

642 if (f->plane_count) {

643 if (colorspace != f->colorspace ||

644 bits_per_raw_sample != f->avctx->bits_per_raw_sample ||

645 chroma_planes != f->chroma_planes ||

646 chroma_h_shift != f->chroma_h_shift ||

647 chroma_v_shift != f->chroma_v_shift ||

648 transparency != f->transparency) {

649 av_log(f->avctx, AV_LOG_ERROR, "Invalid change of global parameters\n");

650 return AVERROR_INVALIDDATA;

651 }

652 }

653

654 f->colorspace = colorspace;

655 f->avctx->bits_per_raw_sample = bits_per_raw_sample;

656 f->chroma_planes = chroma_planes;

657 f->chroma_h_shift = chroma_h_shift;

658 f->chroma_v_shift = chroma_v_shift;

659 f->transparency = transparency;

660

661 f->plane_count = 2 + f->transparency;

662 }

663

664 if (f->colorspace == 0) {

665 if (f->avctx->skip_alpha) f->transparency = 0;

666 if (!f->transparency && !f->chroma_planes) {

667 if (f->avctx->bits_per_raw_sample <= 8)

668 f->avctx->pix_fmt = AV_PIX_FMT_GRAY8;

669 else

670 f->avctx->pix_fmt = AV_PIX_FMT_GRAY16;

671 } else if (f->avctx->bits_per_raw_sample<=8 && !f->transparency) {

672 switch(16 * f->chroma_h_shift + f->chroma_v_shift) {

673 case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P; break;

674 case 0x01: f->avctx->pix_fmt = AV_PIX_FMT_YUV440P; break;

675 case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P; break;

676 case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P; break;

677 case 0x20: f->avctx->pix_fmt = AV_PIX_FMT_YUV411P; break;

678 case 0x22: f->avctx->pix_fmt = AV_PIX_FMT_YUV410P; break;

679 }

680 } else if (f->avctx->bits_per_raw_sample <= 8 && f->transparency) {

681 switch(16*f->chroma_h_shift + f->chroma_v_shift) {

682 case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P; break;

683 case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P; break;

684 case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P; break;

685 }

686 } else if (f->avctx->bits_per_raw_sample == 9 && !f->transparency) {

687 f->packed_at_lsb = 1;

688 switch(16 * f->chroma_h_shift + f->chroma_v_shift) {

689 case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P9; break;

690 case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P9; break;

691 case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P9; break;

692 }

693 } else if (f->avctx->bits_per_raw_sample == 9 && f->transparency) {

694 f->packed_at_lsb = 1;

695 switch(16 * f->chroma_h_shift + f->chroma_v_shift) {

696 case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P9; break;

697 case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P9; break;

698 case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P9; break;

699 }

700 } else if (f->avctx->bits_per_raw_sample == 10 && !f->transparency) {

701 f->packed_at_lsb = 1;

702 switch(16 * f->chroma_h_shift + f->chroma_v_shift) {

703 case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P10; break;

704 case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P10; break;

705 case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P10; break;

706 }

707 } else if (f->avctx->bits_per_raw_sample == 10 && f->transparency) {

708 f->packed_at_lsb = 1;

709 switch(16 * f->chroma_h_shift + f->chroma_v_shift) {

710 case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P10; break;

711 case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P10; break;

712 case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P10; break;

713 }

714 } else if (f->avctx->bits_per_raw_sample == 16 && !f->transparency){

715 switch(16 * f->chroma_h_shift + f->chroma_v_shift) {

716 case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P16; break;

717 case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P16; break;

718 case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P16; break;

719 }

720 } else if (f->avctx->bits_per_raw_sample == 16 && f->transparency){

721 switch(16 * f->chroma_h_shift + f->chroma_v_shift) {

722 case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P16; break;

723 case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P16; break;

724 case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P16; break;

725 }

726 }

727 } else if (f->colorspace == 1) {

728 if (f->chroma_h_shift || f->chroma_v_shift) {

729 av_log(f->avctx, AV_LOG_ERROR,

730 "chroma subsampling not supported in this colorspace\n");

731 return AVERROR(ENOSYS);

732 }

733 if ( f->avctx->bits_per_raw_sample == 9)

734 f->avctx->pix_fmt = AV_PIX_FMT_GBRP9;

735 else if (f->avctx->bits_per_raw_sample == 10)

736 f->avctx->pix_fmt = AV_PIX_FMT_GBRP10;

737 else if (f->avctx->bits_per_raw_sample == 12)

738 f->avctx->pix_fmt = AV_PIX_FMT_GBRP12;

739 else if (f->avctx->bits_per_raw_sample == 14)

740 f->avctx->pix_fmt = AV_PIX_FMT_GBRP14;

741 else

742 if (f->transparency) f->avctx->pix_fmt = AV_PIX_FMT_RGB32;

743 else f->avctx->pix_fmt = AV_PIX_FMT_0RGB32;

744 } else {

745 av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");

746 return AVERROR(ENOSYS);

747 }

748 if (f->avctx->pix_fmt == AV_PIX_FMT_NONE) {

749 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");

750 return AVERROR(ENOSYS);

751 }

752

753 av_dlog(f->avctx, "%d %d %d\n",

754 f->chroma_h_shift, f->chroma_v_shift, f->avctx->pix_fmt);

755 if (f->version < 2) {

756 context_count = read_quant_tables(c, f->quant_table);

757 if (context_count < 0) {

758 av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");

759 return AVERROR_INVALIDDATA;

760 }

761 } else if (f->version < 3) {

762 f->slice_count = get_symbol(c, state, 0);

763 } else {

764 const uint8_t *p = c->bytestream_end;

765 for (f->slice_count = 0;

766 f->slice_count < MAX_SLICES && 3 < p - c->bytestream_start;

767 f->slice_count++) {

768 int trailer = 3 + 5*!!f->ec;

769 int size = AV_RB24(p-trailer);

770 if (size + trailer > p - c->bytestream_start)

771 break;

772 p -= size + trailer;

773 }

774 }

775 if (f->slice_count > (unsigned)MAX_SLICES || f->slice_count <= 0) {

776 av_log(f->avctx, AV_LOG_ERROR, "slice count %d is invalid\n", f->slice_count);

777 return AVERROR_INVALIDDATA;

778 }

779

780 for (j = 0; j < f->slice_count; j++) {

781 FFV1Context *fs = f->slice_context[j];

782 fs->ac = f->ac;

783 fs->packed_at_lsb = f->packed_at_lsb;

784

785 fs->slice_damaged = 0;

786

787 if (f->version == 2) {

788 fs->slice_x = get_symbol(c, state, 0) * f->width ;

789 fs->slice_y = get_symbol(c, state, 0) * f->height;

790 fs->slice_width = (get_symbol(c, state, 0) + 1) * f->width + fs->slice_x;

791 fs->slice_height = (get_symbol(c, state, 0) + 1) * f->height + fs->slice_y;

792

793 fs->slice_x /= f->num_h_slices;

794 fs->slice_y /= f->num_v_slices;

795 fs->slice_width = fs->slice_width / f->num_h_slices - fs->slice_x;

796 fs->slice_height = fs->slice_height / f->num_v_slices - fs->slice_y;

797 if ((unsigned)fs->slice_width > f->width ||

798 (unsigned)fs->slice_height > f->height)

799 return AVERROR_INVALIDDATA;

800 if ( (unsigned)fs->slice_x + (uint64_t)fs->slice_width > f->width

801 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)

802 return AVERROR_INVALIDDATA;

803 }

804

805 for (i = 0; i < f->plane_count; i++) {

806 PlaneContext *const p = &fs->plane[i];

807

808 if (f->version == 2) {

809 int idx = get_symbol(c, state, 0);

810 if (idx > (unsigned)f->quant_table_count) {

811 av_log(f->avctx, AV_LOG_ERROR,

812 "quant_table_index out of range\n");

813 return AVERROR_INVALIDDATA;

814 }

815 p->quant_table_index = idx;

816 memcpy(p->quant_table, f->quant_tables[idx],

817 sizeof(p->quant_table));

818 context_count = f->context_count[idx];

819 } else {

820 memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));

821 }

822

823 if (f->version <= 2) {

824 av_assert0(context_count >= 0);

825 if (p->context_count < context_count) {

826 av_freep(&p->state);

827 av_freep(&p->vlc_state);

828 }

829 p->context_count = context_count;

830 }

831 }

832 }

833 return 0;

834 }

835

836 static av_cold int decode_init(AVCodecContext *avctx)

837 {

838 FFV1Context *f = avctx->priv_data;

839 int ret;

840

841 if ((ret = ffv1_common_init(avctx)) < 0)

842 return ret;

843

844 if (avctx->extradata && (ret = read_extra_header(f)) < 0)

845 return ret;

846

847 if ((ret = ffv1_init_slice_contexts(f)) < 0)

848 return ret;

849

850 avctx->internal->allocate_progress = 1;

851

852 return 0;

853 }

854

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

856 {

857 uint8_t *buf = avpkt->data;

858 int buf_size = avpkt->size;

859 FFV1Context *f = avctx->priv_data;

860 RangeCoder *const c = &f->slice_context[0]->c;

861 int i, ret;

862 uint8_t keystate = 128;

863 uint8_t *buf_p;

864 AVFrame *p;

865

866 if (f->last_picture.f)

867 ff_thread_release_buffer(avctx, &f->last_picture);

868 FFSWAP(ThreadFrame, f->picture, f->last_picture);

869

870 f->cur = p = f->picture.f;

871

872 if (f->version < 3 && avctx->field_order > AV_FIELD_PROGRESSIVE) {

873 /* we have interlaced material flagged in container */

874 p->interlaced_frame = 1;

875 if (avctx->field_order == AV_FIELD_TT || avctx->field_order == AV_FIELD_TB)

876 p->top_field_first = 1;

877 }

878

879 f->avctx = avctx;

880 ff_init_range_decoder(c, buf, buf_size);

881 ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);

882

883 p->pict_type = AV_PICTURE_TYPE_I; //FIXME I vs. P

884 if (get_rac(c, &keystate)) {

885 p->key_frame = 1;

886 f->key_frame_ok = 0;

887 if ((ret = read_header(f)) < 0)

888 return ret;

889 f->key_frame_ok = 1;

890 } else {

891 if (!f->key_frame_ok) {

892 av_log(avctx, AV_LOG_ERROR,

893 "Cannot decode non-keyframe without valid keyframe\n");

894 return AVERROR_INVALIDDATA;

895 }

896 p->key_frame = 0;

897 }

898

899 if ((ret = ff_thread_get_buffer(avctx, &f->picture, AV_GET_BUFFER_FLAG_REF)) < 0)

900 return ret;

901

902 if (avctx->debug & FF_DEBUG_PICT_INFO)

903 av_log(avctx, AV_LOG_DEBUG, "ver:%d keyframe:%d coder:%d ec:%d slices:%d bps:%d\n",

904 f->version, p->key_frame, f->ac, f->ec, f->slice_count, f->avctx->bits_per_raw_sample);

905

906 ff_thread_finish_setup(avctx);

907

908 buf_p = buf + buf_size;

909 for (i = f->slice_count - 1; i >= 0; i--) {

910 FFV1Context *fs = f->slice_context[i];

911 int trailer = 3 + 5*!!f->ec;

912 int v;

913

914 if (i || f->version > 2) v = AV_RB24(buf_p-trailer) + trailer;

915 else v = buf_p - c->bytestream_start;

916 if (buf_p - c->bytestream_start < v) {

917 av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");

918 return AVERROR_INVALIDDATA;

919 }

920 buf_p -= v;

921

922 if (f->ec) {

923 unsigned crc = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0, buf_p, v);

924 if (crc) {

925 int64_t ts = avpkt->pts != AV_NOPTS_VALUE ? avpkt->pts : avpkt->dts;

926 av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!", crc);

927 if (ts != AV_NOPTS_VALUE && avctx->pkt_timebase.num) {

928 av_log(f->avctx, AV_LOG_ERROR, "at %f seconds\n", ts*av_q2d(avctx->pkt_timebase));

929 } else if (ts != AV_NOPTS_VALUE) {

930 av_log(f->avctx, AV_LOG_ERROR, "at %"PRId64"\n", ts);

931 } else {

932 av_log(f->avctx, AV_LOG_ERROR, "\n");

933 }

934 fs->slice_damaged = 1;

935 }

936 }

937

938 if (i) {

939 ff_init_range_decoder(&fs->c, buf_p, v);

940 } else

941 fs->c.bytestream_end = buf_p + v;

942

943 fs->avctx = avctx;

944 fs->cur = p;

945 }

946

947 avctx->execute(avctx,

948 decode_slice,

949 &f->slice_context[0],

950 NULL,

951 f->slice_count,

952 sizeof(void*));

953

954 for (i = f->slice_count - 1; i >= 0; i--) {

955 FFV1Context *fs = f->slice_context[i];

956 int j;

957 if (fs->slice_damaged && f->last_picture.f->data[0]) {

958 const uint8_t *src[4];

959 uint8_t *dst[4];

960 ff_thread_await_progress(&f->last_picture, INT_MAX, 0);

961 for (j = 0; j < 4; j++) {

962 int sh = (j == 1 || j == 2) ? f->chroma_h_shift : 0;

963 int sv = (j == 1 || j == 2) ? f->chroma_v_shift : 0;

964 dst[j] = p->data[j] + p->linesize[j] *

965 (fs->slice_y >> sv) + (fs->slice_x >> sh);

966 src[j] = f->last_picture.f->data[j] + f->last_picture.f->linesize[j] *

967 (fs->slice_y >> sv) + (fs->slice_x >> sh);

968 }

969 av_image_copy(dst, p->linesize, src,

970 f->last_picture.f->linesize,

971 avctx->pix_fmt,

972 fs->slice_width,

973 fs->slice_height);

974 }

975 }

976 ff_thread_report_progress(&f->picture, INT_MAX, 0);

977

978 f->picture_number++;

979

980 if (f->last_picture.f)

981 ff_thread_release_buffer(avctx, &f->last_picture);

982 f->cur = NULL;

983 if ((ret = av_frame_ref(data, f->picture.f)) < 0)

984 return ret;

985

986 *got_frame = 1;

987

988 return buf_size;

989 }

990

991 static int init_thread_copy(AVCodecContext *avctx)

992 {

993 FFV1Context *f = avctx->priv_data;

994 int i, ret;

995

996 f->picture.f = NULL;

997 f->last_picture.f = NULL;

998 f->sample_buffer = NULL;

999 f->slice_count = 0;

1000

1001 for (i = 0; i < f->quant_table_count; i++) {

1002 av_assert0(f->version > 1);

1003 f->initial_states[i] = av_memdup(f->initial_states[i],

1004 f->context_count[i] * sizeof(*f->initial_states[i]));

1005 }

1006

1007 f->picture.f = av_frame_alloc();

1008 f->last_picture.f = av_frame_alloc();

1009

1010 if ((ret = ffv1_init_slice_contexts(f)) < 0)

1011 return ret;

1012

1013 return 0;

1014 }

1015

1016 static void copy_fields(FFV1Context *fsdst, FFV1Context *fssrc, FFV1Context *fsrc)

1017 {

1018 fsdst->version = fsrc->version;

1019 fsdst->micro_version = fsrc->micro_version;

1020 fsdst->chroma_planes = fsrc->chroma_planes;

1021 fsdst->chroma_h_shift = fsrc->chroma_h_shift;

1022 fsdst->chroma_v_shift = fsrc->chroma_v_shift;

1023 fsdst->transparency = fsrc->transparency;

1024 fsdst->plane_count = fsrc->plane_count;

1025 fsdst->ac = fsrc->ac;

1026 fsdst->colorspace = fsrc->colorspace;

1027

1028 fsdst->ec = fsrc->ec;

1029 fsdst->intra = fsrc->intra;

1030 fsdst->slice_damaged = fssrc->slice_damaged;

1031 fsdst->key_frame_ok = fsrc->key_frame_ok;

1032

1033 fsdst->bits_per_raw_sample = fsrc->bits_per_raw_sample;

1034 fsdst->packed_at_lsb = fsrc->packed_at_lsb;

1035 fsdst->slice_count = fsrc->slice_count;

1036 if (fsrc->version<3){

1037 fsdst->slice_x = fssrc->slice_x;

1038 fsdst->slice_y = fssrc->slice_y;

1039 fsdst->slice_width = fssrc->slice_width;

1040 fsdst->slice_height = fssrc->slice_height;

1041 }

1042 }

1043

1044 static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)

1045 {

1046 FFV1Context *fsrc = src->priv_data;

1047 FFV1Context *fdst = dst->priv_data;

1048 int i, ret;

1049

1050 if (dst == src)

1051 return 0;

1052

1053 {

1054 ThreadFrame picture = fdst->picture, last_picture = fdst->last_picture;

1055 uint8_t (*initial_states[MAX_QUANT_TABLES])[32];

1056 struct FFV1Context *slice_context[MAX_SLICES];

1057 memcpy(initial_states, fdst->initial_states, sizeof(fdst->initial_states));

1058 memcpy(slice_context, fdst->slice_context , sizeof(fdst->slice_context));

1059

1060 memcpy(fdst, fsrc, sizeof(*fdst));

1061 memcpy(fdst->initial_states, initial_states, sizeof(fdst->initial_states));

1062 memcpy(fdst->slice_context, slice_context , sizeof(fdst->slice_context));

1063 fdst->picture = picture;

1064 fdst->last_picture = last_picture;

1065 for (i = 0; i<fdst->num_h_slices * fdst->num_v_slices; i++) {

1066 FFV1Context *fssrc = fsrc->slice_context[i];

1067 FFV1Context *fsdst = fdst->slice_context[i];

1068 copy_fields(fsdst, fssrc, fsrc);

1069 }

1070 av_assert0(!fdst->plane[0].state);

1071 av_assert0(!fdst->sample_buffer);

1072 }

1073

1074 av_assert1(fdst->slice_count == fsrc->slice_count);

1075

1076

1077 ff_thread_release_buffer(dst, &fdst->picture);

1078 if (fsrc->picture.f->data[0]) {

1079 if ((ret = ff_thread_ref_frame(&fdst->picture, &fsrc->picture)) < 0)

1080 return ret;

1081 }

1082

1083 fdst->fsrc = fsrc;

1084

1085 return 0;

1086 }

1087

1088 AVCodec ff_ffv1_decoder = {

1089 .name = "ffv1",

1090 .long_name = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),

1091 .type = AVMEDIA_TYPE_VIDEO,

1092 .id = AV_CODEC_ID_FFV1,

1093 .priv_data_size = sizeof(FFV1Context),

1094 .init = decode_init,

1095 .close = ffv1_close,

1096 .decode = decode_frame,

1097 .init_thread_copy = ONLY_IF_THREADS_ENABLED(init_thread_copy),

1098 .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),

1099 .capabilities = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/ |

1100 CODEC_CAP_FRAME_THREADS | CODEC_CAP_SLICE_THREADS,

1101 };

Generated on Sun Mar 8 2015 02:34:51 for FFmpeg by doxygen 1.8.2