FFmpeg: libavcodec/ratecontrol.c Source File

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ratecontrol.c

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1 /*

2 * Rate control for video encoders

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 * Rate control for video encoders.

26 */

28 #include "libavutil/attributes.h"

29 #include "avcodec.h"

30 #include "ratecontrol.h"

31 #include "mpegutils.h"

32 #include "mpegvideo.h"

33 #include "libavutil/eval.h"

35 #undef NDEBUG // Always check asserts, the speed effect is far too small to disable them.

36 #include <assert.h>

38 #ifndef M_E

39 #define M_E 2.718281828

40 #endif

42 static int init_pass2(MpegEncContext *s);

43 static double get_qscale(MpegEncContext *s, RateControlEntry *rce,

44 double rate_factor, int frame_num);

46 void ff_write_pass1_stats(MpegEncContext *s)

47 {

48 snprintf(s->avctx->stats_out, 256,

49 "in:%d out:%d type:%d q:%d itex:%d ptex:%d mv:%d misc:%d "

50 "fcode:%d bcode:%d mc-var:%"PRId64" var:%"PRId64" icount:%d skipcount:%d hbits:%d;\n",

51 s->current_picture_ptr->f->display_picture_number,

52 s->current_picture_ptr->f->coded_picture_number,

53 s->pict_type,

54 s->current_picture.f->quality,

55 s->i_tex_bits,

56 s->p_tex_bits,

57 s->mv_bits,

58 s->misc_bits,

59 s->f_code,

60 s->b_code,

61 s->current_picture.mc_mb_var_sum,

62 s->current_picture.mb_var_sum,

63 s->i_count, s->skip_count,

64 s->header_bits);

65 }

67 static double get_fps(AVCodecContext *avctx)

68 {

69 return 1.0 / av_q2d(avctx->time_base) / FFMAX(avctx->ticks_per_frame, 1);

70 }

72 static inline double qp2bits(RateControlEntry *rce, double qp)

73 {

74 if (qp <= 0.0) {

75 av_log(NULL, AV_LOG_ERROR, "qp<=0.0\n");

76 }

77 return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits + 1) / qp;

78 }

80 static inline double bits2qp(RateControlEntry *rce, double bits)

81 {

82 if (bits < 0.9) {

83 av_log(NULL, AV_LOG_ERROR, "bits<0.9\n");

84 }

85 return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits + 1) / bits;

86 }

88 av_cold int ff_rate_control_init(MpegEncContext *s)

89 {

90 RateControlContext *rcc = &s->rc_context;

91 int i, res;

92 static const char * const const_names[] = {

93 "PI",

94 "E",

95 "iTex",

96 "pTex",

97 "tex",

98 "mv",

99 "fCode",

100 "iCount",

101 "mcVar",

102 "var",

103 "isI",

104 "isP",

105 "isB",

106 "avgQP",

107 "qComp",

108 #if 0

109 "lastIQP",

110 "lastPQP",

111 "lastBQP",

112 "nextNonBQP",

113 #endif

114 "avgIITex",

115 "avgPITex",

116 "avgPPTex",

117 "avgBPTex",

118 "avgTex",

119 NULL

120 };

121 static double (* const func1[])(void *, double) = {

122 (void *)bits2qp,

123 (void *)qp2bits,

124 NULL

125 };

126 static const char * const func1_names[] = {

127 "bits2qp",

128 "qp2bits",

129 NULL

130 };

131 emms_c();

132

133 if (!s->avctx->rc_max_available_vbv_use && s->avctx->rc_buffer_size) {

134 if (s->avctx->rc_max_rate) {

135 s->avctx->rc_max_available_vbv_use = av_clipf(s->avctx->rc_max_rate/(s->avctx->rc_buffer_size*get_fps(s->avctx)), 1.0/3, 1.0);

136 } else

137 s->avctx->rc_max_available_vbv_use = 1.0;

138 }

139

140 res = av_expr_parse(&rcc->rc_eq_eval,

141 s->avctx->rc_eq ? s->avctx->rc_eq : "tex^qComp",

142 const_names, func1_names, func1,

143 NULL, NULL, 0, s->avctx);

144 if (res < 0) {

145 av_log(s->avctx, AV_LOG_ERROR, "Error parsing rc_eq \"%s\"\n", s->avctx->rc_eq);

146 return res;

147 }

148

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

150 rcc->pred[i].coeff = FF_QP2LAMBDA * 7.0;

151 rcc->pred[i].count = 1.0;

152 rcc->pred[i].decay = 0.4;

153

154 rcc->i_cplx_sum [i] =

155 rcc->p_cplx_sum [i] =

156 rcc->mv_bits_sum[i] =

157 rcc->qscale_sum [i] =

158 rcc->frame_count[i] = 1; // 1 is better because of 1/0 and such

159

160 rcc->last_qscale_for[i] = FF_QP2LAMBDA * 5;

161 }

162 rcc->buffer_index = s->avctx->rc_initial_buffer_occupancy;

163 if (!rcc->buffer_index)

164 rcc->buffer_index = s->avctx->rc_buffer_size * 3 / 4;

165

166 if (s->flags & CODEC_FLAG_PASS2) {

167 int i;

168 char *p;

169

170 /* find number of pics */

171 p = s->avctx->stats_in;

172 for (i = -1; p; i++)

173 p = strchr(p + 1, ';');

174 i += s->max_b_frames;

175 if (i <= 0 || i >= INT_MAX / sizeof(RateControlEntry))

176 return -1;

177 rcc->entry = av_mallocz(i * sizeof(RateControlEntry));

178 rcc->num_entries = i;

179

180 /* init all to skipped p frames

181 * (with b frames we might have a not encoded frame at the end FIXME) */

182 for (i = 0; i < rcc->num_entries; i++) {

183 RateControlEntry *rce = &rcc->entry[i];

184

185 rce->pict_type = rce->new_pict_type = AV_PICTURE_TYPE_P;

186 rce->qscale = rce->new_qscale = FF_QP2LAMBDA * 2;

187 rce->misc_bits = s->mb_num + 10;

188 rce->mb_var_sum = s->mb_num * 100;

189 }

190

191 /* read stats */

192 p = s->avctx->stats_in;

193 for (i = 0; i < rcc->num_entries - s->max_b_frames; i++) {

194 RateControlEntry *rce;

195 int picture_number;

196 int e;

197 char *next;

198

199 next = strchr(p, ';');

200 if (next) {

201 (*next) = 0; // sscanf in unbelievably slow on looong strings // FIXME copy / do not write

202 next++;

203 }

204 e = sscanf(p, " in:%d ", &picture_number);

205

206 assert(picture_number >= 0);

207 assert(picture_number < rcc->num_entries);

208 rce = &rcc->entry[picture_number];

209

210 e += sscanf(p, " in:%*d out:%*d type:%d q:%f itex:%d ptex:%d mv:%d misc:%d fcode:%d bcode:%d mc-var:%"SCNd64" var:%"SCNd64" icount:%d skipcount:%d hbits:%d",

211 &rce->pict_type, &rce->qscale, &rce->i_tex_bits, &rce->p_tex_bits,

212 &rce->mv_bits, &rce->misc_bits,

213 &rce->f_code, &rce->b_code,

214 &rce->mc_mb_var_sum, &rce->mb_var_sum,

215 &rce->i_count, &rce->skip_count, &rce->header_bits);

216 if (e != 14) {

217 av_log(s->avctx, AV_LOG_ERROR,

218 "statistics are damaged at line %d, parser out=%d\n",

219 i, e);

220 return -1;

221 }

222

223 p = next;

224 }

225

226 if (init_pass2(s) < 0)

227 return -1;

228

229 // FIXME maybe move to end

230 if ((s->flags & CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID) {

231 #if CONFIG_LIBXVID

232 return ff_xvid_rate_control_init(s);

233 #else

234 av_log(s->avctx, AV_LOG_ERROR,

235 "Xvid ratecontrol requires libavcodec compiled with Xvid support.\n");

236 return -1;

237 #endif

238 }

239 }

240

241 if (!(s->flags & CODEC_FLAG_PASS2)) {

242 rcc->short_term_qsum = 0.001;

243 rcc->short_term_qcount = 0.001;

244

245 rcc->pass1_rc_eq_output_sum = 0.001;

246 rcc->pass1_wanted_bits = 0.001;

247

248 if (s->avctx->qblur > 1.0) {

249 av_log(s->avctx, AV_LOG_ERROR, "qblur too large\n");

250 return -1;

251 }

252 /* init stuff with the user specified complexity */

253 if (s->avctx->rc_initial_cplx) {

254 for (i = 0; i < 60 * 30; i++) {

255 double bits = s->avctx->rc_initial_cplx * (i / 10000.0 + 1.0) * s->mb_num;

256 RateControlEntry rce;

257

258 if (i % ((s->gop_size + 3) / 4) == 0)

259 rce.pict_type = AV_PICTURE_TYPE_I;

260 else if (i % (s->max_b_frames + 1))

261 rce.pict_type = AV_PICTURE_TYPE_B;

262 else

263 rce.pict_type = AV_PICTURE_TYPE_P;

264

265 rce.new_pict_type = rce.pict_type;

266 rce.mc_mb_var_sum = bits * s->mb_num / 100000;

267 rce.mb_var_sum = s->mb_num;

268

269 rce.qscale = FF_QP2LAMBDA * 2;

270 rce.f_code = 2;

271 rce.b_code = 1;

272 rce.misc_bits = 1;

273

274 if (s->pict_type == AV_PICTURE_TYPE_I) {

275 rce.i_count = s->mb_num;

276 rce.i_tex_bits = bits;

277 rce.p_tex_bits = 0;

278 rce.mv_bits = 0;

279 } else {

280 rce.i_count = 0; // FIXME we do know this approx

281 rce.i_tex_bits = 0;

282 rce.p_tex_bits = bits * 0.9;

283 rce.mv_bits = bits * 0.1;

284 }

285 rcc->i_cplx_sum[rce.pict_type] += rce.i_tex_bits * rce.qscale;

286 rcc->p_cplx_sum[rce.pict_type] += rce.p_tex_bits * rce.qscale;

287 rcc->mv_bits_sum[rce.pict_type] += rce.mv_bits;

288 rcc->frame_count[rce.pict_type]++;

289

290 get_qscale(s, &rce, rcc->pass1_wanted_bits / rcc->pass1_rc_eq_output_sum, i);

291

292 // FIXME misbehaves a little for variable fps

293 rcc->pass1_wanted_bits += s->bit_rate / get_fps(s->avctx);

294 }

295 }

296 }

297

298 return 0;

299 }

300

301 av_cold void ff_rate_control_uninit(MpegEncContext *s)

302 {

303 RateControlContext *rcc = &s->rc_context;

304 emms_c();

305

306 av_expr_free(rcc->rc_eq_eval);

307 av_freep(&rcc->entry);

308

309 #if CONFIG_LIBXVID

310 if ((s->flags & CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)

311 ff_xvid_rate_control_uninit(s);

312 #endif

313 }

314

315 int ff_vbv_update(MpegEncContext *s, int frame_size)

316 {

317 RateControlContext *rcc = &s->rc_context;

318 const double fps = get_fps(s->avctx);

319 const int buffer_size = s->avctx->rc_buffer_size;

320 const double min_rate = s->avctx->rc_min_rate / fps;

321 const double max_rate = s->avctx->rc_max_rate / fps;

322

323 av_dlog(s, "%d %f %d %f %f\n",

324 buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate);

325

326 if (buffer_size) {

327 int left;

328

329 rcc->buffer_index -= frame_size;

330 if (rcc->buffer_index < 0) {

331 av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n");

332 if (frame_size > max_rate && s->qscale == s->avctx->qmax) {

333 av_log(s->avctx, AV_LOG_ERROR, "max bitrate possibly too small or try trellis with large lmax or increase qmax\n");

334 }

335 rcc->buffer_index = 0;

336 }

337

338 left = buffer_size - rcc->buffer_index - 1;

339 rcc->buffer_index += av_clip(left, min_rate, max_rate);

340

341 if (rcc->buffer_index > buffer_size) {

342 int stuffing = ceil((rcc->buffer_index - buffer_size) / 8);

343

344 if (stuffing < 4 && s->codec_id == AV_CODEC_ID_MPEG4)

345 stuffing = 4;

346 rcc->buffer_index -= 8 * stuffing;

347

348 if (s->avctx->debug & FF_DEBUG_RC)

349 av_log(s->avctx, AV_LOG_DEBUG, "stuffing %d bytes\n", stuffing);

350

351 return stuffing;

352 }

353 }

354 return 0;

355 }

356

357 /**

358 * Modify the bitrate curve from pass1 for one frame.

359 */

360 static double get_qscale(MpegEncContext *s, RateControlEntry *rce,

361 double rate_factor, int frame_num)

362 {

363 RateControlContext *rcc = &s->rc_context;

364 AVCodecContext *a = s->avctx;

365 const int pict_type = rce->new_pict_type;

366 const double mb_num = s->mb_num;

367 double q, bits;

368 int i;

369

370 double const_values[] = {

371 M_PI,

372 M_E,

373 rce->i_tex_bits * rce->qscale,

374 rce->p_tex_bits * rce->qscale,

375 (rce->i_tex_bits + rce->p_tex_bits) * (double)rce->qscale,

376 rce->mv_bits / mb_num,

377 rce->pict_type == AV_PICTURE_TYPE_B ? (rce->f_code + rce->b_code) * 0.5 : rce->f_code,

378 rce->i_count / mb_num,

379 rce->mc_mb_var_sum / mb_num,

380 rce->mb_var_sum / mb_num,

381 rce->pict_type == AV_PICTURE_TYPE_I,

382 rce->pict_type == AV_PICTURE_TYPE_P,

383 rce->pict_type == AV_PICTURE_TYPE_B,

384 rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type],

385 a->qcompress,

386 #if 0

387 rcc->last_qscale_for[AV_PICTURE_TYPE_I],

388 rcc->last_qscale_for[AV_PICTURE_TYPE_P],

389 rcc->last_qscale_for[AV_PICTURE_TYPE_B],

390 rcc->next_non_b_qscale,

391 #endif

392 rcc->i_cplx_sum[AV_PICTURE_TYPE_I] / (double)rcc->frame_count[AV_PICTURE_TYPE_I],

393 rcc->i_cplx_sum[AV_PICTURE_TYPE_P] / (double)rcc->frame_count[AV_PICTURE_TYPE_P],

394 rcc->p_cplx_sum[AV_PICTURE_TYPE_P] / (double)rcc->frame_count[AV_PICTURE_TYPE_P],

395 rcc->p_cplx_sum[AV_PICTURE_TYPE_B] / (double)rcc->frame_count[AV_PICTURE_TYPE_B],

396 (rcc->i_cplx_sum[pict_type] + rcc->p_cplx_sum[pict_type]) / (double)rcc->frame_count[pict_type],

397 0

398 };

399

400 bits = av_expr_eval(rcc->rc_eq_eval, const_values, rce);

401 if (isnan(bits)) {

402 av_log(s->avctx, AV_LOG_ERROR, "Error evaluating rc_eq \"%s\"\n", s->avctx->rc_eq);

403 return -1;

404 }

405

406 rcc->pass1_rc_eq_output_sum += bits;

407 bits *= rate_factor;

408 if (bits < 0.0)

409 bits = 0.0;

410 bits += 1.0; // avoid 1/0 issues

411

412 /* user override */

413 for (i = 0; i < s->avctx->rc_override_count; i++) {

414 RcOverride *rco = s->avctx->rc_override;

415 if (rco[i].start_frame > frame_num)

416 continue;

417 if (rco[i].end_frame < frame_num)

418 continue;

419

420 if (rco[i].qscale)

421 bits = qp2bits(rce, rco[i].qscale); // FIXME move at end to really force it?

422 else

423 bits *= rco[i].quality_factor;

424 }

425

426 q = bits2qp(rce, bits);

427

428 /* I/B difference */

429 if (pict_type == AV_PICTURE_TYPE_I && s->avctx->i_quant_factor < 0.0)

430 q = -q * s->avctx->i_quant_factor + s->avctx->i_quant_offset;

431 else if (pict_type == AV_PICTURE_TYPE_B && s->avctx->b_quant_factor < 0.0)

432 q = -q * s->avctx->b_quant_factor + s->avctx->b_quant_offset;

433 if (q < 1)

434 q = 1;

435

436 return q;

437 }

438

439 static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q)

440 {

441 RateControlContext *rcc = &s->rc_context;

442 AVCodecContext *a = s->avctx;

443 const int pict_type = rce->new_pict_type;

444 const double last_p_q = rcc->last_qscale_for[AV_PICTURE_TYPE_P];

445 const double last_non_b_q = rcc->last_qscale_for[rcc->last_non_b_pict_type];

446

447 if (pict_type == AV_PICTURE_TYPE_I &&

448 (a->i_quant_factor > 0.0 || rcc->last_non_b_pict_type == AV_PICTURE_TYPE_P))

449 q = last_p_q * FFABS(a->i_quant_factor) + a->i_quant_offset;

450 else if (pict_type == AV_PICTURE_TYPE_B &&

451 a->b_quant_factor > 0.0)

452 q = last_non_b_q * a->b_quant_factor + a->b_quant_offset;

453 if (q < 1)

454 q = 1;

455

456 /* last qscale / qdiff stuff */

457 if (rcc->last_non_b_pict_type == pict_type || pict_type != AV_PICTURE_TYPE_I) {

458 double last_q = rcc->last_qscale_for[pict_type];

459 const int maxdiff = FF_QP2LAMBDA * a->max_qdiff;

460

461 if (q > last_q + maxdiff)

462 q = last_q + maxdiff;

463 else if (q < last_q - maxdiff)

464 q = last_q - maxdiff;

465 }

466

467 rcc->last_qscale_for[pict_type] = q; // Note we cannot do that after blurring

468

469 if (pict_type != AV_PICTURE_TYPE_B)

470 rcc->last_non_b_pict_type = pict_type;

471

472 return q;

473 }

474

475 /**

476 * Get the qmin & qmax for pict_type.

477 */

478 static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pict_type)

479 {

480 int qmin = s->avctx->lmin;

481 int qmax = s->avctx->lmax;

482

483 assert(qmin <= qmax);

484

485 switch (pict_type) {

486 case AV_PICTURE_TYPE_B:

487 qmin = (int)(qmin * FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset + 0.5);

488 qmax = (int)(qmax * FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset + 0.5);

489 break;

490 case AV_PICTURE_TYPE_I:

491 qmin = (int)(qmin * FFABS(s->avctx->i_quant_factor) + s->avctx->i_quant_offset + 0.5);

492 qmax = (int)(qmax * FFABS(s->avctx->i_quant_factor) + s->avctx->i_quant_offset + 0.5);

493 break;

494 }

495

496 qmin = av_clip(qmin, 1, FF_LAMBDA_MAX);

497 qmax = av_clip(qmax, 1, FF_LAMBDA_MAX);

498

499 if (qmax < qmin)

500 qmax = qmin;

501

502 *qmin_ret = qmin;

503 *qmax_ret = qmax;

504 }

505

506 static double modify_qscale(MpegEncContext *s, RateControlEntry *rce,

507 double q, int frame_num)

508 {

509 RateControlContext *rcc = &s->rc_context;

510 const double buffer_size = s->avctx->rc_buffer_size;

511 const double fps = get_fps(s->avctx);

512 const double min_rate = s->avctx->rc_min_rate / fps;

513 const double max_rate = s->avctx->rc_max_rate / fps;

514 const int pict_type = rce->new_pict_type;

515 int qmin, qmax;

516

517 get_qminmax(&qmin, &qmax, s, pict_type);

518

519 /* modulation */

520 if (s->avctx->rc_qmod_freq &&

521 frame_num % s->avctx->rc_qmod_freq == 0 &&

522 pict_type == AV_PICTURE_TYPE_P)

523 q *= s->avctx->rc_qmod_amp;

524

525 /* buffer overflow/underflow protection */

526 if (buffer_size) {

527 double expected_size = rcc->buffer_index;

528 double q_limit;

529

530 if (min_rate) {

531 double d = 2 * (buffer_size - expected_size) / buffer_size;

532 if (d > 1.0)

533 d = 1.0;

534 else if (d < 0.0001)

535 d = 0.0001;

536 q *= pow(d, 1.0 / s->avctx->rc_buffer_aggressivity);

537

538 q_limit = bits2qp(rce,

539 FFMAX((min_rate - buffer_size + rcc->buffer_index) *

540 s->avctx->rc_min_vbv_overflow_use, 1));

541

542 if (q > q_limit) {

543 if (s->avctx->debug & FF_DEBUG_RC)

544 av_log(s->avctx, AV_LOG_DEBUG,

545 "limiting QP %f -> %f\n", q, q_limit);

546 q = q_limit;

547 }

548 }

549

550 if (max_rate) {

551 double d = 2 * expected_size / buffer_size;

552 if (d > 1.0)

553 d = 1.0;

554 else if (d < 0.0001)

555 d = 0.0001;

556 q /= pow(d, 1.0 / s->avctx->rc_buffer_aggressivity);

557

558 q_limit = bits2qp(rce,

559 FFMAX(rcc->buffer_index *

560 s->avctx->rc_max_available_vbv_use,

561 1));

562 if (q < q_limit) {

563 if (s->avctx->debug & FF_DEBUG_RC)

564 av_log(s->avctx, AV_LOG_DEBUG,

565 "limiting QP %f -> %f\n", q, q_limit);

566 q = q_limit;

567 }

568 }

569 }

570 av_dlog(s, "q:%f max:%f min:%f size:%f index:%f agr:%f\n",

571 q, max_rate, min_rate, buffer_size, rcc->buffer_index,

572 s->avctx->rc_buffer_aggressivity);

573 if (s->avctx->rc_qsquish == 0.0 || qmin == qmax) {

574 if (q < qmin)

575 q = qmin;

576 else if (q > qmax)

577 q = qmax;

578 } else {

579 double min2 = log(qmin);

580 double max2 = log(qmax);

581

582 q = log(q);

583 q = (q - min2) / (max2 - min2) - 0.5;

584 q *= -4.0;

585 q = 1.0 / (1.0 + exp(q));

586 q = q * (max2 - min2) + min2;

587

588 q = exp(q);

589 }

590

591 return q;

592 }

593

594 // ----------------------------------

595 // 1 Pass Code

596

597 static double predict_size(Predictor *p, double q, double var)

598 {

599 return p->coeff * var / (q * p->count);

600 }

601

602 static void update_predictor(Predictor *p, double q, double var, double size)

603 {

604 double new_coeff = size * q / (var + 1);

605 if (var < 10)

606 return;

607

608 p->count *= p->decay;

609 p->coeff *= p->decay;

610 p->count++;

611 p->coeff += new_coeff;

612 }

613

614 static void adaptive_quantization(MpegEncContext *s, double q)

615 {

616 int i;

617 const float lumi_masking = s->avctx->lumi_masking / (128.0 * 128.0);

618 const float dark_masking = s->avctx->dark_masking / (128.0 * 128.0);

619 const float temp_cplx_masking = s->avctx->temporal_cplx_masking;

620 const float spatial_cplx_masking = s->avctx->spatial_cplx_masking;

621 const float p_masking = s->avctx->p_masking;

622 const float border_masking = s->avctx->border_masking;

623 float bits_sum = 0.0;

624 float cplx_sum = 0.0;

625 float *cplx_tab = s->cplx_tab;

626 float *bits_tab = s->bits_tab;

627 const int qmin = s->avctx->mb_lmin;

628 const int qmax = s->avctx->mb_lmax;

629 Picture *const pic = &s->current_picture;

630 const int mb_width = s->mb_width;

631 const int mb_height = s->mb_height;

632

633 for (i = 0; i < s->mb_num; i++) {

634 const int mb_xy = s->mb_index2xy[i];

635 float temp_cplx = sqrt(pic->mc_mb_var[mb_xy]); // FIXME merge in pow()

636 float spat_cplx = sqrt(pic->mb_var[mb_xy]);

637 const int lumi = pic->mb_mean[mb_xy];

638 float bits, cplx, factor;

639 int mb_x = mb_xy % s->mb_stride;

640 int mb_y = mb_xy / s->mb_stride;

641 int mb_distance;

642 float mb_factor = 0.0;

643 if (spat_cplx < 4)

644 spat_cplx = 4; // FIXME finetune

645 if (temp_cplx < 4)

646 temp_cplx = 4; // FIXME finetune

647

648 if ((s->mb_type[mb_xy] & CANDIDATE_MB_TYPE_INTRA)) { // FIXME hq mode

649 cplx = spat_cplx;

650 factor = 1.0 + p_masking;

651 } else {

652 cplx = temp_cplx;

653 factor = pow(temp_cplx, -temp_cplx_masking);

654 }

655 factor *= pow(spat_cplx, -spatial_cplx_masking);

656

657 if (lumi > 127)

658 factor *= (1.0 - (lumi - 128) * (lumi - 128) * lumi_masking);

659 else

660 factor *= (1.0 - (lumi - 128) * (lumi - 128) * dark_masking);

661

662 if (mb_x < mb_width / 5) {

663 mb_distance = mb_width / 5 - mb_x;

664 mb_factor = (float)mb_distance / (float)(mb_width / 5);

665 } else if (mb_x > 4 * mb_width / 5) {

666 mb_distance = mb_x - 4 * mb_width / 5;

667 mb_factor = (float)mb_distance / (float)(mb_width / 5);

668 }

669 if (mb_y < mb_height / 5) {

670 mb_distance = mb_height / 5 - mb_y;

671 mb_factor = FFMAX(mb_factor,

672 (float)mb_distance / (float)(mb_height / 5));

673 } else if (mb_y > 4 * mb_height / 5) {

674 mb_distance = mb_y - 4 * mb_height / 5;

675 mb_factor = FFMAX(mb_factor,

676 (float)mb_distance / (float)(mb_height / 5));

677 }

678

679 factor *= 1.0 - border_masking * mb_factor;

680

681 if (factor < 0.00001)

682 factor = 0.00001;

683

684 bits = cplx * factor;

685 cplx_sum += cplx;

686 bits_sum += bits;

687 cplx_tab[i] = cplx;

688 bits_tab[i] = bits;

689 }

690

691 /* handle qmin/qmax clipping */

692 if (s->mpv_flags & FF_MPV_FLAG_NAQ) {

693 float factor = bits_sum / cplx_sum;

694 for (i = 0; i < s->mb_num; i++) {

695 float newq = q * cplx_tab[i] / bits_tab[i];

696 newq *= factor;

697

698 if (newq > qmax) {

699 bits_sum -= bits_tab[i];

700 cplx_sum -= cplx_tab[i] * q / qmax;

701 } else if (newq < qmin) {

702 bits_sum -= bits_tab[i];

703 cplx_sum -= cplx_tab[i] * q / qmin;

704 }

705 }

706 if (bits_sum < 0.001)

707 bits_sum = 0.001;

708 if (cplx_sum < 0.001)

709 cplx_sum = 0.001;

710 }

711

712 for (i = 0; i < s->mb_num; i++) {

713 const int mb_xy = s->mb_index2xy[i];

714 float newq = q * cplx_tab[i] / bits_tab[i];

715 int intq;

716

717 if (s->mpv_flags & FF_MPV_FLAG_NAQ) {

718 newq *= bits_sum / cplx_sum;

719 }

720

721 intq = (int)(newq + 0.5);

722

723 if (intq > qmax)

724 intq = qmax;

725 else if (intq < qmin)

726 intq = qmin;

727 s->lambda_table[mb_xy] = intq;

728 }

729 }

730

731 void ff_get_2pass_fcode(MpegEncContext *s)

732 {

733 RateControlContext *rcc = &s->rc_context;

734 RateControlEntry *rce = &rcc->entry[s->picture_number];

735

736 s->f_code = rce->f_code;

737 s->b_code = rce->b_code;

738 }

739

740 // FIXME rd or at least approx for dquant

741

742 float ff_rate_estimate_qscale(MpegEncContext *s, int dry_run)

743 {

744 float q;

745 int qmin, qmax;

746 float br_compensation;

747 double diff;

748 double short_term_q;

749 double fps;

750 int picture_number = s->picture_number;

751 int64_t wanted_bits;

752 RateControlContext *rcc = &s->rc_context;

753 AVCodecContext *a = s->avctx;

754 RateControlEntry local_rce, *rce;

755 double bits;

756 double rate_factor;

757 int64_t var;

758 const int pict_type = s->pict_type;

759 Picture * const pic = &s->current_picture;

760 emms_c();

761

762 #if CONFIG_LIBXVID

763 if ((s->flags & CODEC_FLAG_PASS2) &&

764 s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)

765 return ff_xvid_rate_estimate_qscale(s, dry_run);

766 #endif

767

768 get_qminmax(&qmin, &qmax, s, pict_type);

769

770 fps = get_fps(s->avctx);

771 /* update predictors */

772 if (picture_number > 2 && !dry_run) {

773 const int64_t last_var =

774 s->last_pict_type == AV_PICTURE_TYPE_I ? rcc->last_mb_var_sum

775 : rcc->last_mc_mb_var_sum;

776 av_assert1(s->frame_bits >= s->stuffing_bits);

777 update_predictor(&rcc->pred[s->last_pict_type],

778 rcc->last_qscale,

779 sqrt(last_var),

780 s->frame_bits - s->stuffing_bits);

781 }

782

783 if (s->flags & CODEC_FLAG_PASS2) {

784 assert(picture_number >= 0);

785 if (picture_number >= rcc->num_entries) {

786 av_log(s, AV_LOG_ERROR, "Input is longer than 2-pass log file\n");

787 return -1;

788 }

789 rce = &rcc->entry[picture_number];

790 wanted_bits = rce->expected_bits;

791 } else {

792 Picture *dts_pic;

793 rce = &local_rce;

794

795 /* FIXME add a dts field to AVFrame and ensure it is set and use it

796 * here instead of reordering but the reordering is simpler for now

797 * until H.264 B-pyramid must be handled. */

798 if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay)

799 dts_pic = s->current_picture_ptr;

800 else

801 dts_pic = s->last_picture_ptr;

802

803 if (!dts_pic || dts_pic->f->pts == AV_NOPTS_VALUE)

804 wanted_bits = (uint64_t)(s->bit_rate * (double)picture_number / fps);

805 else

806 wanted_bits = (uint64_t)(s->bit_rate * (double)dts_pic->f->pts / fps);

807 }

808

809 diff = s->total_bits - wanted_bits;

810 br_compensation = (a->bit_rate_tolerance - diff) / a->bit_rate_tolerance;

811 if (br_compensation <= 0.0)

812 br_compensation = 0.001;

813

814 var = pict_type == AV_PICTURE_TYPE_I ? pic->mb_var_sum : pic->mc_mb_var_sum;

815

816 short_term_q = 0; /* avoid warning */

817 if (s->flags & CODEC_FLAG_PASS2) {

818 if (pict_type != AV_PICTURE_TYPE_I)

819 assert(pict_type == rce->new_pict_type);

820

821 q = rce->new_qscale / br_compensation;

822 av_dlog(s, "%f %f %f last:%d var:%"PRId64" type:%d//\n", q, rce->new_qscale,

823 br_compensation, s->frame_bits, var, pict_type);

824 } else {

825 rce->pict_type =

826 rce->new_pict_type = pict_type;

827 rce->mc_mb_var_sum = pic->mc_mb_var_sum;

828 rce->mb_var_sum = pic->mb_var_sum;

829 rce->qscale = FF_QP2LAMBDA * 2;

830 rce->f_code = s->f_code;

831 rce->b_code = s->b_code;

832 rce->misc_bits = 1;

833

834 bits = predict_size(&rcc->pred[pict_type], rce->qscale, sqrt(var));

835 if (pict_type == AV_PICTURE_TYPE_I) {

836 rce->i_count = s->mb_num;

837 rce->i_tex_bits = bits;

838 rce->p_tex_bits = 0;

839 rce->mv_bits = 0;

840 } else {

841 rce->i_count = 0; // FIXME we do know this approx

842 rce->i_tex_bits = 0;

843 rce->p_tex_bits = bits * 0.9;

844 rce->mv_bits = bits * 0.1;

845 }

846 rcc->i_cplx_sum[pict_type] += rce->i_tex_bits * rce->qscale;

847 rcc->p_cplx_sum[pict_type] += rce->p_tex_bits * rce->qscale;

848 rcc->mv_bits_sum[pict_type] += rce->mv_bits;

849 rcc->frame_count[pict_type]++;

850

851 bits = rce->i_tex_bits + rce->p_tex_bits;

852 rate_factor = rcc->pass1_wanted_bits /

853 rcc->pass1_rc_eq_output_sum * br_compensation;

854

855 q = get_qscale(s, rce, rate_factor, picture_number);

856 if (q < 0)

857 return -1;

858

859 assert(q > 0.0);

860 q = get_diff_limited_q(s, rce, q);

861 assert(q > 0.0);

862

863 // FIXME type dependent blur like in 2-pass

864 if (pict_type == AV_PICTURE_TYPE_P || s->intra_only) {

865 rcc->short_term_qsum *= a->qblur;

866 rcc->short_term_qcount *= a->qblur;

867

868 rcc->short_term_qsum += q;

869 rcc->short_term_qcount++;

870 q = short_term_q = rcc->short_term_qsum / rcc->short_term_qcount;

871 }

872 assert(q > 0.0);

873

874 q = modify_qscale(s, rce, q, picture_number);

875

876 rcc->pass1_wanted_bits += s->bit_rate / fps;

877

878 assert(q > 0.0);

879 }

880

881 if (s->avctx->debug & FF_DEBUG_RC) {

882 av_log(s->avctx, AV_LOG_DEBUG,

883 "%c qp:%d<%2.1f<%d %d want:%d total:%d comp:%f st_q:%2.2f "

884 "size:%d var:%"PRId64"/%"PRId64" br:%d fps:%d\n",

885 av_get_picture_type_char(pict_type),

886 qmin, q, qmax, picture_number,

887 (int)wanted_bits / 1000, (int)s->total_bits / 1000,

888 br_compensation, short_term_q, s->frame_bits,

889 pic->mb_var_sum, pic->mc_mb_var_sum,

890 s->bit_rate / 1000, (int)fps);

891 }

892

893 if (q < qmin)

894 q = qmin;

895 else if (q > qmax)

896 q = qmax;

897

898 if (s->adaptive_quant)

899 adaptive_quantization(s, q);

900 else

901 q = (int)(q + 0.5);

902

903 if (!dry_run) {

904 rcc->last_qscale = q;

905 rcc->last_mc_mb_var_sum = pic->mc_mb_var_sum;

906 rcc->last_mb_var_sum = pic->mb_var_sum;

907 }

908 return q;

909 }

910

911 // ----------------------------------------------

912 // 2-Pass code

913

914 static int init_pass2(MpegEncContext *s)

915 {

916 RateControlContext *rcc = &s->rc_context;

917 AVCodecContext *a = s->avctx;

918 int i, toobig;

919 double fps = get_fps(s->avctx);

920 double complexity[5] = { 0 }; // approximate bits at quant=1

921 uint64_t const_bits[5] = { 0 }; // quantizer independent bits

922 uint64_t all_const_bits;

923 uint64_t all_available_bits = (uint64_t)(s->bit_rate *

924 (double)rcc->num_entries / fps);

925 double rate_factor = 0;

926 double step;

927 const int filter_size = (int)(a->qblur * 4) | 1;

928 double expected_bits = 0; // init to silence gcc warning

929 double *qscale, *blurred_qscale, qscale_sum;

930

931 /* find complexity & const_bits & decide the pict_types */

932 for (i = 0; i < rcc->num_entries; i++) {

933 RateControlEntry *rce = &rcc->entry[i];

934

935 rce->new_pict_type = rce->pict_type;

936 rcc->i_cplx_sum[rce->pict_type] += rce->i_tex_bits * rce->qscale;

937 rcc->p_cplx_sum[rce->pict_type] += rce->p_tex_bits * rce->qscale;

938 rcc->mv_bits_sum[rce->pict_type] += rce->mv_bits;

939 rcc->frame_count[rce->pict_type]++;

940

941 complexity[rce->new_pict_type] += (rce->i_tex_bits + rce->p_tex_bits) *

942 (double)rce->qscale;

943 const_bits[rce->new_pict_type] += rce->mv_bits + rce->misc_bits;

944 }

945

946 all_const_bits = const_bits[AV_PICTURE_TYPE_I] +

947 const_bits[AV_PICTURE_TYPE_P] +

948 const_bits[AV_PICTURE_TYPE_B];

949

950 if (all_available_bits < all_const_bits) {

951 av_log(s->avctx, AV_LOG_ERROR, "requested bitrate is too low\n");

952 return -1;

953 }

954

955 qscale = av_malloc_array(rcc->num_entries, sizeof(double));

956 blurred_qscale = av_malloc_array(rcc->num_entries, sizeof(double));

957 toobig = 0;

958

959 for (step = 256 * 256; step > 0.0000001; step *= 0.5) {

960 expected_bits = 0;

961 rate_factor += step;

962

963 rcc->buffer_index = s->avctx->rc_buffer_size / 2;

964

965 /* find qscale */

966 for (i = 0; i < rcc->num_entries; i++) {

967 RateControlEntry *rce = &rcc->entry[i];

968

969 qscale[i] = get_qscale(s, &rcc->entry[i], rate_factor, i);

970 rcc->last_qscale_for[rce->pict_type] = qscale[i];

971 }

972 assert(filter_size % 2 == 1);

973

974 /* fixed I/B QP relative to P mode */

975 for (i = FFMAX(0, rcc->num_entries - 300); i < rcc->num_entries; i++) {

976 RateControlEntry *rce = &rcc->entry[i];

977

978 qscale[i] = get_diff_limited_q(s, rce, qscale[i]);

979 }

980

981 for (i = rcc->num_entries - 1; i >= 0; i--) {

982 RateControlEntry *rce = &rcc->entry[i];

983

984 qscale[i] = get_diff_limited_q(s, rce, qscale[i]);

985 }

986

987 /* smooth curve */

988 for (i = 0; i < rcc->num_entries; i++) {

989 RateControlEntry *rce = &rcc->entry[i];

990 const int pict_type = rce->new_pict_type;

991 int j;

992 double q = 0.0, sum = 0.0;

993

994 for (j = 0; j < filter_size; j++) {

995 int index = i + j - filter_size / 2;

996 double d = index - i;

997 double coeff = a->qblur == 0 ? 1.0 : exp(-d * d / (a->qblur * a->qblur));

998

999 if (index < 0 || index >= rcc->num_entries)

1000 continue;

1001 if (pict_type != rcc->entry[index].new_pict_type)

1002 continue;

1003 q += qscale[index] * coeff;

1004 sum += coeff;

1005 }

1006 blurred_qscale[i] = q / sum;

1007 }

1008

1009 /* find expected bits */

1010 for (i = 0; i < rcc->num_entries; i++) {

1011 RateControlEntry *rce = &rcc->entry[i];

1012 double bits;

1013

1014 rce->new_qscale = modify_qscale(s, rce, blurred_qscale[i], i);

1015

1016 bits = qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits;

1017 bits += 8 * ff_vbv_update(s, bits);

1018

1019 rce->expected_bits = expected_bits;

1020 expected_bits += bits;

1021 }

1022

1023 av_dlog(s->avctx,

1024 "expected_bits: %f all_available_bits: %d rate_factor: %f\n",

1025 expected_bits, (int)all_available_bits, rate_factor);

1026 if (expected_bits > all_available_bits) {

1027 rate_factor -= step;

1028 ++toobig;

1029 }

1030 }

1031 av_free(qscale);

1032 av_free(blurred_qscale);

1033

1034 /* check bitrate calculations and print info */

1035 qscale_sum = 0.0;

1036 for (i = 0; i < rcc->num_entries; i++) {

1037 av_dlog(s, "[lavc rc] entry[%d].new_qscale = %.3f qp = %.3f\n",

1038 i,

1039 rcc->entry[i].new_qscale,

1040 rcc->entry[i].new_qscale / FF_QP2LAMBDA);

1041 qscale_sum += av_clip(rcc->entry[i].new_qscale / FF_QP2LAMBDA,

1042 s->avctx->qmin, s->avctx->qmax);

1043 }

1044 assert(toobig <= 40);

1045 av_log(s->avctx, AV_LOG_DEBUG,

1046 "[lavc rc] requested bitrate: %d bps expected bitrate: %d bps\n",

1047 s->bit_rate,

1048 (int)(expected_bits / ((double)all_available_bits / s->bit_rate)));

1049 av_log(s->avctx, AV_LOG_DEBUG,

1050 "[lavc rc] estimated target average qp: %.3f\n",

1051 (float)qscale_sum / rcc->num_entries);

1052 if (toobig == 0) {

1053 av_log(s->avctx, AV_LOG_INFO,

1054 "[lavc rc] Using all of requested bitrate is not "

1055 "necessary for this video with these parameters.\n");

1056 } else if (toobig == 40) {

1057 av_log(s->avctx, AV_LOG_ERROR,

1058 "[lavc rc] Error: bitrate too low for this video "

1059 "with these parameters.\n");

1060 return -1;

1061 } else if (fabs(expected_bits / all_available_bits - 1.0) > 0.01) {

1062 av_log(s->avctx, AV_LOG_ERROR,

1063 "[lavc rc] Error: 2pass curve failed to converge\n");

1064 return -1;

1065 }

1066

1067 return 0;

1068 }

Generated on Sun Jul 20 2014 23:05:54 for FFmpeg by doxygen 1.8.2