FFmpeg: libavcodec/libxvid.c Source File

FFmpeg

[フレーム]

libavcodec

libxvid.c

Go to the documentation of this file.

1 /*

2 * Interface to xvidcore for mpeg4 encoding

4 *

5 * This file is part of FFmpeg.

6 *

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

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

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

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

11 *

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

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

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

15 * Lesser General Public License for more details.

16 *

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

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

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

20 */

22 /**

23 * @file

24 * Interface to xvidcore for MPEG-4 compliant encoding.

25 * @author Adam Thayer (krevnik@comcast.net)

26 */

28 #include <xvid.h>

30 #include "libavutil/cpu.h"

31 #include "libavutil/file.h"

32 #include "libavutil/intreadwrite.h"

33 #include "libavutil/mathematics.h"

35 #include "avcodec.h"

36 #include "internal.h"

37 #include "libxvid.h"

38 #include "mpegvideo.h"

40 #if HAVE_UNISTD_H

41 #include <unistd.h>

42 #endif

44 #if HAVE_IO_H

45 #include <io.h>

46 #endif

48 /**

49 * Buffer management macros.

50 */

51 #define BUFFER_SIZE 1024

52 #define BUFFER_REMAINING(x) (BUFFER_SIZE - strlen(x))

53 #define BUFFER_CAT(x) (&((x)[strlen(x)]))

55 /**

56 * Structure for the private Xvid context.

57 * This stores all the private context for the codec.

58 */

59 struct xvid_context {

60 AVClass *class;

61 void *encoder_handle; /**< Handle for Xvid encoder */

62 int xsize; /**< Frame x size */

63 int ysize; /**< Frame y size */

64 int vop_flags; /**< VOP flags for Xvid encoder */

65 int vol_flags; /**< VOL flags for Xvid encoder */

66 int me_flags; /**< Motion Estimation flags */

67 int qscale; /**< Do we use constant scale? */

68 int quicktime_format; /**< Are we in a QT-based format? */

69 char *twopassbuffer; /**< Character buffer for two-pass */

70 char *old_twopassbuffer; /**< Old character buffer (two-pass) */

71 char *twopassfile; /**< second pass temp file name */

72 int twopassfd;

73 unsigned char *intra_matrix; /**< P-Frame Quant Matrix */

74 unsigned char *inter_matrix; /**< I-Frame Quant Matrix */

75 int lumi_aq; /**< Lumi masking as an aq method */

76 int variance_aq; /**< Variance adaptive quantization */

77 int ssim; /**< SSIM information display mode */

78 int ssim_acc; /**< SSIM accuracy. 0: accurate. 4: fast. */

79 int gmc;

80 };

82 /**

83 * Structure for the private first-pass plugin.

84 */

85 struct xvid_ff_pass1 {

86 int version; /**< Xvid version */

87 struct xvid_context *context; /**< Pointer to private context */

88 };

90 static int xvid_encode_close(AVCodecContext *avctx);

92 /*

93 * Xvid 2-Pass Kludge Section

94 *

95 * Xvid's default 2-pass doesn't allow us to create data as we need to, so

96 * this section spends time replacing the first pass plugin so we can write

97 * statistic information as libavcodec requests in. We have another kludge

98 * that allows us to pass data to the second pass in Xvid without a custom

99 * rate-control plugin.

100 */

101

102 /**

103 * Initialize the two-pass plugin and context.

104 *

105 * @param param Input construction parameter structure

106 * @param handle Private context handle

107 * @return Returns XVID_ERR_xxxx on failure, or 0 on success.

108 */

109 static int xvid_ff_2pass_create(xvid_plg_create_t *param, void **handle)

110 {

111 struct xvid_ff_pass1 *x = (struct xvid_ff_pass1 *) param->param;

112 char *log = x->context->twopassbuffer;

113

114 /* Do a quick bounds check */

115 if (!log)

116 return XVID_ERR_FAIL;

117

118 /* We use snprintf() */

119 /* This is because we can safely prevent a buffer overflow */

120 log[0] = 0;

121 snprintf(log, BUFFER_REMAINING(log),

122 "# ffmpeg 2-pass log file, using xvid codec\n");

123 snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),

124 "# Do not modify. libxvidcore version: %d.%d.%d\n\n",

125 XVID_VERSION_MAJOR(XVID_VERSION),

126 XVID_VERSION_MINOR(XVID_VERSION),

127 XVID_VERSION_PATCH(XVID_VERSION));

128

129 *handle = x->context;

130 return 0;

131 }

132

133 /**

134 * Destroy the two-pass plugin context.

135 *

136 * @param ref Context pointer for the plugin

137 * @param param Destrooy context

138 * @return Returns 0, success guaranteed

139 */

140 static int xvid_ff_2pass_destroy(struct xvid_context *ref,

141 xvid_plg_destroy_t *param)

142 {

143 /* Currently cannot think of anything to do on destruction */

144 /* Still, the framework should be here for reference/use */

145 if (ref->twopassbuffer)

146 ref->twopassbuffer[0] = 0;

147 return 0;

148 }

149

150 /**

151 * Enable fast encode mode during the first pass.

152 *

153 * @param ref Context pointer for the plugin

154 * @param param Frame data

155 * @return Returns 0, success guaranteed

156 */

157 static int xvid_ff_2pass_before(struct xvid_context *ref,

158 xvid_plg_data_t *param)

159 {

160 int motion_remove;

161 int motion_replacements;

162 int vop_remove;

163

164 /* Nothing to do here, result is changed too much */

165 if (param->zone && param->zone->mode == XVID_ZONE_QUANT)

166 return 0;

167

168 /* We can implement a 'turbo' first pass mode here */

169 param->quant = 2;

170

171 /* Init values */

172 motion_remove = ~XVID_ME_CHROMA_PVOP &

173 ~XVID_ME_CHROMA_BVOP &

174 ~XVID_ME_EXTSEARCH16 &

175 ~XVID_ME_ADVANCEDDIAMOND16;

176 motion_replacements = XVID_ME_FAST_MODEINTERPOLATE |

177 XVID_ME_SKIP_DELTASEARCH |

178 XVID_ME_FASTREFINE16 |

179 XVID_ME_BFRAME_EARLYSTOP;

180 vop_remove = ~XVID_VOP_MODEDECISION_RD &

181 ~XVID_VOP_FAST_MODEDECISION_RD &

182 ~XVID_VOP_TRELLISQUANT &

183 ~XVID_VOP_INTER4V &

184 ~XVID_VOP_HQACPRED;

185

186 param->vol_flags &= ~XVID_VOL_GMC;

187 param->vop_flags &= vop_remove;

188 param->motion_flags &= motion_remove;

189 param->motion_flags |= motion_replacements;

190

191 return 0;

192 }

193

194 /**

195 * Capture statistic data and write it during first pass.

196 *

197 * @param ref Context pointer for the plugin

198 * @param param Statistic data

199 * @return Returns XVID_ERR_xxxx on failure, or 0 on success

200 */

201 static int xvid_ff_2pass_after(struct xvid_context *ref,

202 xvid_plg_data_t *param)

203 {

204 char *log = ref->twopassbuffer;

205 const char *frame_types = " ipbs";

206 char frame_type;

207

208 /* Quick bounds check */

209 if (!log)

210 return XVID_ERR_FAIL;

211

212 /* Convert the type given to us into a character */

213 if (param->type < 5 && param->type > 0)

214 frame_type = frame_types[param->type];

215 else

216 return XVID_ERR_FAIL;

217

218 snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),

219 "%c %d %d %d %d %d %d\n",

220 frame_type, param->stats.quant, param->stats.kblks,

221 param->stats.mblks, param->stats.ublks,

222 param->stats.length, param->stats.hlength);

223

224 return 0;

225 }

226

227 /**

228 * Dispatch function for our custom plugin.

229 * This handles the dispatch for the Xvid plugin. It passes data

230 * on to other functions for actual processing.

231 *

232 * @param ref Context pointer for the plugin

233 * @param cmd The task given for us to complete

234 * @param p1 First parameter (varies)

235 * @param p2 Second parameter (varies)

236 * @return Returns XVID_ERR_xxxx on failure, or 0 on success

237 */

238 static int xvid_ff_2pass(void *ref, int cmd, void *p1, void *p2)

239 {

240 switch (cmd) {

241 case XVID_PLG_INFO:

242 case XVID_PLG_FRAME:

243 return 0;

244 case XVID_PLG_BEFORE:

245 return xvid_ff_2pass_before(ref, p1);

246 case XVID_PLG_CREATE:

247 return xvid_ff_2pass_create(p1, p2);

248 case XVID_PLG_AFTER:

249 return xvid_ff_2pass_after(ref, p1);

250 case XVID_PLG_DESTROY:

251 return xvid_ff_2pass_destroy(ref, p1);

252 default:

253 return XVID_ERR_FAIL;

254 }

255 }

256

257 /**

258 * Routine to create a global VO/VOL header for MP4 container.

259 * What we do here is extract the header from the Xvid bitstream

260 * as it is encoded. We also strip the repeated headers from the

261 * bitstream when a global header is requested for MPEG-4 ISO

262 * compliance.

263 *

264 * @param avctx AVCodecContext pointer to context

265 * @param frame Pointer to encoded frame data

266 * @param header_len Length of header to search

267 * @param frame_len Length of encoded frame data

268 * @return Returns new length of frame data

269 */

270 static int xvid_strip_vol_header(AVCodecContext *avctx, AVPacket *pkt,

271 unsigned int header_len,

272 unsigned int frame_len)

273 {

274 int vo_len = 0, i;

275

276 for (i = 0; i < header_len - 3; i++) {

277 if (pkt->data[i] == 0x00 &&

278 pkt->data[i + 1] == 0x00 &&

279 pkt->data[i + 2] == 0x01 &&

280 pkt->data[i + 3] == 0xB6) {

281 vo_len = i;

282 break;

283 }

284 }

285

286 if (vo_len > 0) {

287 /* We need to store the header, so extract it */

288 if (!avctx->extradata) {

289 avctx->extradata = av_malloc(vo_len);

290 if (!avctx->extradata)

291 return AVERROR(ENOMEM);

292 memcpy(avctx->extradata, pkt->data, vo_len);

293 avctx->extradata_size = vo_len;

294 }

295 /* Less dangerous now, memmove properly copies the two

296 * chunks of overlapping data */

297 memmove(pkt->data, &pkt->data[vo_len], frame_len - vo_len);

298 pkt->size = frame_len - vo_len;

299 }

300 return 0;

301 }

302

303 /**

304 * Routine to correct a possibly erroneous framerate being fed to us.

305 * Xvid currently chokes on framerates where the ticks per frame is

306 * extremely large. This function works to correct problems in this area

307 * by estimating a new framerate and taking the simpler fraction of

308 * the two presented.

309 *

310 * @param avctx Context that contains the framerate to correct.

311 */

312 static void xvid_correct_framerate(AVCodecContext *avctx)

313 {

314 int frate, fbase;

315 int est_frate, est_fbase;

316 int gcd;

317 float est_fps, fps;

318

319 frate = avctx->time_base.den;

320 fbase = avctx->time_base.num;

321

322 gcd = av_gcd(frate, fbase);

323 if (gcd > 1) {

324 frate /= gcd;

325 fbase /= gcd;

326 }

327

328 if (frate <= 65000 && fbase <= 65000) {

329 avctx->time_base.den = frate;

330 avctx->time_base.num = fbase;

331 return;

332 }

333

334 fps = (float) frate / (float) fbase;

335 est_fps = roundf(fps * 1000.0) / 1000.0;

336

337 est_frate = (int) est_fps;

338 if (est_fps > (int) est_fps) {

339 est_frate = (est_frate + 1) * 1000;

340 est_fbase = (int) roundf((float) est_frate / est_fps);

341 } else

342 est_fbase = 1;

343

344 gcd = av_gcd(est_frate, est_fbase);

345 if (gcd > 1) {

346 est_frate /= gcd;

347 est_fbase /= gcd;

348 }

349

350 if (fbase > est_fbase) {

351 avctx->time_base.den = est_frate;

352 avctx->time_base.num = est_fbase;

353 av_log(avctx, AV_LOG_DEBUG,

354 "Xvid: framerate re-estimated: %.2f, %.3f%% correction\n",

355 est_fps, (((est_fps - fps) / fps) * 100.0));

356 } else {

357 avctx->time_base.den = frate;

358 avctx->time_base.num = fbase;

359 }

360 }

361

362 static av_cold int xvid_encode_init(AVCodecContext *avctx)

363 {

364 int xerr, i, ret = -1;

365 int xvid_flags = avctx->flags;

366 struct xvid_context *x = avctx->priv_data;

367 uint16_t *intra, *inter;

368 int fd;

369

370 xvid_plugin_single_t single = { 0 };

371 struct xvid_ff_pass1 rc2pass1 = { 0 };

372 xvid_plugin_2pass2_t rc2pass2 = { 0 };

373 xvid_plugin_lumimasking_t masking_l = { 0 }; /* For lumi masking */

374 xvid_plugin_lumimasking_t masking_v = { 0 }; /* For variance AQ */

375 xvid_plugin_ssim_t ssim = { 0 };

376 xvid_gbl_init_t xvid_gbl_init = { 0 };

377 xvid_enc_create_t xvid_enc_create = { 0 };

378 xvid_enc_plugin_t plugins[4];

379

380 x->twopassfd = -1;

381

382 /* Bring in VOP flags from ffmpeg command-line */

383 x->vop_flags = XVID_VOP_HALFPEL; /* Bare minimum quality */

384 if (xvid_flags & CODEC_FLAG_4MV)

385 x->vop_flags |= XVID_VOP_INTER4V; /* Level 3 */

386 if (avctx->trellis)

387 x->vop_flags |= XVID_VOP_TRELLISQUANT; /* Level 5 */

388 if (xvid_flags & CODEC_FLAG_AC_PRED)

389 x->vop_flags |= XVID_VOP_HQACPRED; /* Level 6 */

390 if (xvid_flags & CODEC_FLAG_GRAY)

391 x->vop_flags |= XVID_VOP_GREYSCALE;

392

393 /* Decide which ME quality setting to use */

394 x->me_flags = 0;

395 switch (avctx->me_method) {

396 case ME_FULL: /* Quality 6 */

397 x->me_flags |= XVID_ME_EXTSEARCH16 |

398 XVID_ME_EXTSEARCH8;

399

400 case ME_EPZS: /* Quality 4 */

401 x->me_flags |= XVID_ME_ADVANCEDDIAMOND8 |

402 XVID_ME_HALFPELREFINE8 |

403 XVID_ME_CHROMA_PVOP |

404 XVID_ME_CHROMA_BVOP;

405

406 case ME_LOG: /* Quality 2 */

407 case ME_PHODS:

408 case ME_X1:

409 x->me_flags |= XVID_ME_ADVANCEDDIAMOND16 |

410 XVID_ME_HALFPELREFINE16;

411

412 case ME_ZERO: /* Quality 0 */

413 default:

414 break;

415 }

416

417 /* Decide how we should decide blocks */

418 switch (avctx->mb_decision) {

419 case 2:

420 x->vop_flags |= XVID_VOP_MODEDECISION_RD;

421 x->me_flags |= XVID_ME_HALFPELREFINE8_RD |

422 XVID_ME_QUARTERPELREFINE8_RD |

423 XVID_ME_EXTSEARCH_RD |

424 XVID_ME_CHECKPREDICTION_RD;

425 case 1:

426 if (!(x->vop_flags & XVID_VOP_MODEDECISION_RD))

427 x->vop_flags |= XVID_VOP_FAST_MODEDECISION_RD;

428 x->me_flags |= XVID_ME_HALFPELREFINE16_RD |

429 XVID_ME_QUARTERPELREFINE16_RD;

430 default:

431 break;

432 }

433

434 /* Bring in VOL flags from ffmpeg command-line */

435 #if FF_API_GMC

436 if (avctx->flags & CODEC_FLAG_GMC)

437 x->gmc = 1;

438 #endif

439

440 x->vol_flags = 0;

441 if (x->gmc) {

442 x->vol_flags |= XVID_VOL_GMC;

443 x->me_flags |= XVID_ME_GME_REFINE;

444 }

445 if (xvid_flags & CODEC_FLAG_QPEL) {

446 x->vol_flags |= XVID_VOL_QUARTERPEL;

447 x->me_flags |= XVID_ME_QUARTERPELREFINE16;

448 if (x->vop_flags & XVID_VOP_INTER4V)

449 x->me_flags |= XVID_ME_QUARTERPELREFINE8;

450 }

451

452 xvid_gbl_init.version = XVID_VERSION;

453 xvid_gbl_init.debug = 0;

454 xvid_gbl_init.cpu_flags = 0;

455

456 /* Initialize */

457 xvid_global(NULL, XVID_GBL_INIT, &xvid_gbl_init, NULL);

458

459 /* Create the encoder reference */

460 xvid_enc_create.version = XVID_VERSION;

461

462 /* Store the desired frame size */

463 xvid_enc_create.width =

464 x->xsize = avctx->width;

465 xvid_enc_create.height =

466 x->ysize = avctx->height;

467

468 /* Xvid can determine the proper profile to use */

469 /* xvid_enc_create.profile = XVID_PROFILE_S_L3; */

470

471 /* We don't use zones */

472 xvid_enc_create.zones = NULL;

473 xvid_enc_create.num_zones = 0;

474

475 xvid_enc_create.num_threads = avctx->thread_count;

476 #if (XVID_VERSION <= 0x010303) && (XVID_VERSION >= 0x010300)

477 /* workaround for a bug in libxvidcore */

478 if (avctx->height <= 16) {

479 if (avctx->thread_count < 2) {

480 xvid_enc_create.num_threads = 0;

481 } else {

482 av_log(avctx, AV_LOG_ERROR,

483 "Too small height for threads > 1.");

484 ret = AVERROR(EINVAL);

485 goto fail;

486 }

487 }

488 #endif

489

490 xvid_enc_create.plugins = plugins;

491 xvid_enc_create.num_plugins = 0;

492

493 /* Initialize Buffers */

494 x->twopassbuffer = NULL;

495 x->old_twopassbuffer = NULL;

496 x->twopassfile = NULL;

497

498 if (xvid_flags & CODEC_FLAG_PASS1) {

499 rc2pass1.version = XVID_VERSION;

500 rc2pass1.context = x;

501 x->twopassbuffer = av_malloc(BUFFER_SIZE);

502 x->old_twopassbuffer = av_malloc(BUFFER_SIZE);

503 if (!x->twopassbuffer || !x->old_twopassbuffer) {

504 av_log(avctx, AV_LOG_ERROR,

505 "Xvid: Cannot allocate 2-pass log buffers\n");

506 ret = AVERROR(ENOMEM);

507 goto fail;

508 }

509 x->twopassbuffer[0] =

510 x->old_twopassbuffer[0] = 0;

511

512 plugins[xvid_enc_create.num_plugins].func = xvid_ff_2pass;

513 plugins[xvid_enc_create.num_plugins].param = &rc2pass1;

514 xvid_enc_create.num_plugins++;

515 } else if (xvid_flags & CODEC_FLAG_PASS2) {

516 rc2pass2.version = XVID_VERSION;

517 rc2pass2.bitrate = avctx->bit_rate;

518

519 fd = av_tempfile("xvidff.", &x->twopassfile, 0, avctx);

520 if (fd < 0) {

521 av_log(avctx, AV_LOG_ERROR, "Xvid: Cannot write 2-pass pipe\n");

522 ret = fd;

523 goto fail;

524 }

525 x->twopassfd = fd;

526

527 if (!avctx->stats_in) {

528 av_log(avctx, AV_LOG_ERROR,

529 "Xvid: No 2-pass information loaded for second pass\n");

530 ret = AVERROR(EINVAL);

531 goto fail;

532 }

533

534 ret = write(fd, avctx->stats_in, strlen(avctx->stats_in));

535 if (ret == -1)

536 ret = AVERROR(errno);

537 else if (strlen(avctx->stats_in) > ret) {

538 av_log(avctx, AV_LOG_ERROR, "Xvid: Cannot write to 2-pass pipe\n");

539 ret = AVERROR(EIO);

540 }

541 if (ret < 0)

542 goto fail;

543

544 rc2pass2.filename = x->twopassfile;

545 plugins[xvid_enc_create.num_plugins].func = xvid_plugin_2pass2;

546 plugins[xvid_enc_create.num_plugins].param = &rc2pass2;

547 xvid_enc_create.num_plugins++;

548 } else if (!(xvid_flags & CODEC_FLAG_QSCALE)) {

549 /* Single Pass Bitrate Control! */

550 single.version = XVID_VERSION;

551 single.bitrate = avctx->bit_rate;

552

553 plugins[xvid_enc_create.num_plugins].func = xvid_plugin_single;

554 plugins[xvid_enc_create.num_plugins].param = &single;

555 xvid_enc_create.num_plugins++;

556 }

557

558 if (avctx->lumi_masking != 0.0)

559 x->lumi_aq = 1;

560

561 /* Luminance Masking */

562 if (x->lumi_aq) {

563 masking_l.method = 0;

564 plugins[xvid_enc_create.num_plugins].func = xvid_plugin_lumimasking;

565

566 /* The old behavior is that when avctx->lumi_masking is specified,

567 * plugins[...].param = NULL. Trying to keep the old behavior here. */

568 plugins[xvid_enc_create.num_plugins].param =

569 avctx->lumi_masking ? NULL : &masking_l;

570 xvid_enc_create.num_plugins++;

571 }

572

573 /* Variance AQ */

574 if (x->variance_aq) {

575 masking_v.method = 1;

576 plugins[xvid_enc_create.num_plugins].func = xvid_plugin_lumimasking;

577 plugins[xvid_enc_create.num_plugins].param = &masking_v;

578 xvid_enc_create.num_plugins++;

579 }

580

581 if (x->lumi_aq && x->variance_aq )

582 av_log(avctx, AV_LOG_INFO,

583 "Both lumi_aq and variance_aq are enabled. The resulting quality"

584 "will be the worse one of the two effects made by the AQ.\n");

585

586 /* SSIM */

587 if (x->ssim) {

588 plugins[xvid_enc_create.num_plugins].func = xvid_plugin_ssim;

589 ssim.b_printstat = x->ssim == 2;

590 ssim.acc = x->ssim_acc;

591 ssim.cpu_flags = xvid_gbl_init.cpu_flags;

592 ssim.b_visualize = 0;

593 plugins[xvid_enc_create.num_plugins].param = &ssim;

594 xvid_enc_create.num_plugins++;

595 }

596

597 /* Frame Rate and Key Frames */

598 xvid_correct_framerate(avctx);

599 xvid_enc_create.fincr = avctx->time_base.num;

600 xvid_enc_create.fbase = avctx->time_base.den;

601 if (avctx->gop_size > 0)

602 xvid_enc_create.max_key_interval = avctx->gop_size;

603 else

604 xvid_enc_create.max_key_interval = 240; /* Xvid's best default */

605

606 /* Quants */

607 if (xvid_flags & CODEC_FLAG_QSCALE)

608 x->qscale = 1;

609 else

610 x->qscale = 0;

611

612 xvid_enc_create.min_quant[0] = avctx->qmin;

613 xvid_enc_create.min_quant[1] = avctx->qmin;

614 xvid_enc_create.min_quant[2] = avctx->qmin;

615 xvid_enc_create.max_quant[0] = avctx->qmax;

616 xvid_enc_create.max_quant[1] = avctx->qmax;

617 xvid_enc_create.max_quant[2] = avctx->qmax;

618

619 /* Quant Matrices */

620 x->intra_matrix =

621 x->inter_matrix = NULL;

622 if (avctx->mpeg_quant)

623 x->vol_flags |= XVID_VOL_MPEGQUANT;

624 if ((avctx->intra_matrix || avctx->inter_matrix)) {

625 x->vol_flags |= XVID_VOL_MPEGQUANT;

626

627 if (avctx->intra_matrix) {

628 intra = avctx->intra_matrix;

629 x->intra_matrix = av_malloc(sizeof(unsigned char) * 64);

630 if (!x->intra_matrix) {

631 ret = AVERROR(ENOMEM);

632 goto fail;

633 }

634 } else

635 intra = NULL;

636 if (avctx->inter_matrix) {

637 inter = avctx->inter_matrix;

638 x->inter_matrix = av_malloc(sizeof(unsigned char) * 64);

639 if (!x->inter_matrix) {

640 ret = AVERROR(ENOMEM);

641 goto fail;

642 }

643 } else

644 inter = NULL;

645

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

647 if (intra)

648 x->intra_matrix[i] = (unsigned char) intra[i];

649 if (inter)

650 x->inter_matrix[i] = (unsigned char) inter[i];

651 }

652 }

653

654 /* Misc Settings */

655 xvid_enc_create.frame_drop_ratio = 0;

656 xvid_enc_create.global = 0;

657 if (xvid_flags & CODEC_FLAG_CLOSED_GOP)

658 xvid_enc_create.global |= XVID_GLOBAL_CLOSED_GOP;

659

660 /* Determines which codec mode we are operating in */

661 avctx->extradata = NULL;

662 avctx->extradata_size = 0;

663 if (xvid_flags & CODEC_FLAG_GLOBAL_HEADER) {

664 /* In this case, we are claiming to be MPEG4 */

665 x->quicktime_format = 1;

666 avctx->codec_id = AV_CODEC_ID_MPEG4;

667 } else {

668 /* We are claiming to be Xvid */

669 x->quicktime_format = 0;

670 if (!avctx->codec_tag)

671 avctx->codec_tag = AV_RL32("xvid");

672 }

673

674 /* Bframes */

675 xvid_enc_create.max_bframes = avctx->max_b_frames;

676 xvid_enc_create.bquant_offset = 100 * avctx->b_quant_offset;

677 xvid_enc_create.bquant_ratio = 100 * avctx->b_quant_factor;

678 if (avctx->max_b_frames > 0 && !x->quicktime_format)

679 xvid_enc_create.global |= XVID_GLOBAL_PACKED;

680

681 av_assert0(xvid_enc_create.num_plugins + (!!x->ssim) + (!!x->variance_aq) + (!!x->lumi_aq) <= FF_ARRAY_ELEMS(plugins));

682

683 /* Create encoder context */

684 xerr = xvid_encore(NULL, XVID_ENC_CREATE, &xvid_enc_create, NULL);

685 if (xerr) {

686 av_log(avctx, AV_LOG_ERROR, "Xvid: Could not create encoder reference\n");

687 goto fail;

688 }

689

690 x->encoder_handle = xvid_enc_create.handle;

691 avctx->coded_frame = av_frame_alloc();

692 if (!avctx->coded_frame) {

693 ret = AVERROR(ENOMEM);

694 goto fail;

695 }

696

697 return 0;

698 fail:

699 xvid_encode_close(avctx);

700 return ret;

701 }

702

703 static int xvid_encode_frame(AVCodecContext *avctx, AVPacket *pkt,

704 const AVFrame *picture, int *got_packet)

705 {

706 int xerr, i, ret, user_packet = !!pkt->data;

707 struct xvid_context *x = avctx->priv_data;

708 AVFrame *p = avctx->coded_frame;

709 int mb_width = (avctx->width + 15) / 16;

710 int mb_height = (avctx->height + 15) / 16;

711 char *tmp;

712

713 xvid_enc_frame_t xvid_enc_frame = { 0 };

714 xvid_enc_stats_t xvid_enc_stats = { 0 };

715

716 if ((ret = ff_alloc_packet2(avctx, pkt, mb_width*(int64_t)mb_height*MAX_MB_BYTES + FF_MIN_BUFFER_SIZE)) < 0)

717 return ret;

718

719 /* Start setting up the frame */

720 xvid_enc_frame.version = XVID_VERSION;

721 xvid_enc_stats.version = XVID_VERSION;

722

723 /* Let Xvid know where to put the frame. */

724 xvid_enc_frame.bitstream = pkt->data;

725 xvid_enc_frame.length = pkt->size;

726

727 /* Initialize input image fields */

728 if (avctx->pix_fmt != AV_PIX_FMT_YUV420P) {

729 av_log(avctx, AV_LOG_ERROR,

730 "Xvid: Color spaces other than 420P not supported\n");

731 return AVERROR(EINVAL);

732 }

733

734 xvid_enc_frame.input.csp = XVID_CSP_PLANAR; /* YUV420P */

735

736 for (i = 0; i < 4; i++) {

737 xvid_enc_frame.input.plane[i] = picture->data[i];

738 xvid_enc_frame.input.stride[i] = picture->linesize[i];

739 }

740

741 /* Encoder Flags */

742 xvid_enc_frame.vop_flags = x->vop_flags;

743 xvid_enc_frame.vol_flags = x->vol_flags;

744 xvid_enc_frame.motion = x->me_flags;

745 xvid_enc_frame.type =

746 picture->pict_type == AV_PICTURE_TYPE_I ? XVID_TYPE_IVOP :

747 picture->pict_type == AV_PICTURE_TYPE_P ? XVID_TYPE_PVOP :

748 picture->pict_type == AV_PICTURE_TYPE_B ? XVID_TYPE_BVOP :

749 XVID_TYPE_AUTO;

750

751 /* Pixel aspect ratio setting */

752 if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.num > 255 ||

753 avctx->sample_aspect_ratio.den < 0 || avctx->sample_aspect_ratio.den > 255) {

754 av_log(avctx, AV_LOG_WARNING,

755 "Invalid pixel aspect ratio %i/%i, limit is 255/255 reducing\n",

756 avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den);

757 av_reduce(&avctx->sample_aspect_ratio.num, &avctx->sample_aspect_ratio.den,

758 avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den, 255);

759 }

760 xvid_enc_frame.par = XVID_PAR_EXT;

761 xvid_enc_frame.par_width = avctx->sample_aspect_ratio.num;

762 xvid_enc_frame.par_height = avctx->sample_aspect_ratio.den;

763

764 /* Quant Setting */

765 if (x->qscale)

766 xvid_enc_frame.quant = picture->quality / FF_QP2LAMBDA;

767 else

768 xvid_enc_frame.quant = 0;

769

770 /* Matrices */

771 xvid_enc_frame.quant_intra_matrix = x->intra_matrix;

772 xvid_enc_frame.quant_inter_matrix = x->inter_matrix;

773

774 /* Encode */

775 xerr = xvid_encore(x->encoder_handle, XVID_ENC_ENCODE,

776 &xvid_enc_frame, &xvid_enc_stats);

777

778 /* Two-pass log buffer swapping */

779 avctx->stats_out = NULL;

780 if (x->twopassbuffer) {

781 tmp = x->old_twopassbuffer;

782 x->old_twopassbuffer = x->twopassbuffer;

783 x->twopassbuffer = tmp;

784 x->twopassbuffer[0] = 0;

785 if (x->old_twopassbuffer[0] != 0) {

786 avctx->stats_out = x->old_twopassbuffer;

787 }

788 }

789

790 if (xerr > 0) {

791 *got_packet = 1;

792

793 p->quality = xvid_enc_stats.quant * FF_QP2LAMBDA;

794 if (xvid_enc_stats.type == XVID_TYPE_PVOP)

795 p->pict_type = AV_PICTURE_TYPE_P;

796 else if (xvid_enc_stats.type == XVID_TYPE_BVOP)

797 p->pict_type = AV_PICTURE_TYPE_B;

798 else if (xvid_enc_stats.type == XVID_TYPE_SVOP)

799 p->pict_type = AV_PICTURE_TYPE_S;

800 else

801 p->pict_type = AV_PICTURE_TYPE_I;

802 if (xvid_enc_frame.out_flags & XVID_KEYFRAME) {

803 p->key_frame = 1;

804 pkt->flags |= AV_PKT_FLAG_KEY;

805 if (x->quicktime_format)

806 return xvid_strip_vol_header(avctx, pkt,

807 xvid_enc_stats.hlength, xerr);

808 } else

809 p->key_frame = 0;

810

811 pkt->size = xerr;

812

813 return 0;

814 } else {

815 if (!user_packet)

816 av_free_packet(pkt);

817 if (!xerr)

818 return 0;

819 av_log(avctx, AV_LOG_ERROR,

820 "Xvid: Encoding Error Occurred: %i\n", xerr);

821 return AVERROR_EXTERNAL;

822 }

823 }

824

825 static av_cold int xvid_encode_close(AVCodecContext *avctx)

826 {

827 struct xvid_context *x = avctx->priv_data;

828

829 if(x->encoder_handle)

830 xvid_encore(x->encoder_handle, XVID_ENC_DESTROY, NULL, NULL);

831 x->encoder_handle = NULL;

832

833 av_freep(&avctx->extradata);

834 if (x->twopassbuffer) {

835 av_freep(&x->twopassbuffer);

836 av_freep(&x->old_twopassbuffer);

837 avctx->stats_out = NULL;

838 }

839 if (x->twopassfd>=0) {

840 unlink(x->twopassfile);

841 close(x->twopassfd);

842 x->twopassfd = -1;

843 }

844 av_freep(&x->twopassfile);

845 av_freep(&x->intra_matrix);

846 av_freep(&x->inter_matrix);

847 av_frame_free(&avctx->coded_frame);

848

849 return 0;

850 }

851

852 #define OFFSET(x) offsetof(struct xvid_context, x)

853 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

854 static const AVOption options[] = {

855 { "lumi_aq", "Luminance masking AQ", OFFSET(lumi_aq), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },

856 { "variance_aq", "Variance AQ", OFFSET(variance_aq), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },

857 { "ssim", "Show SSIM information to stdout", OFFSET(ssim), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, VE, "ssim" },

858 { "off", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 0 }, INT_MIN, INT_MAX, VE, "ssim" },

859 { "avg", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "ssim" },

860 { "frame", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "ssim" },

861 { "ssim_acc", "SSIM accuracy", OFFSET(ssim_acc), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, 4, VE },

862 { "gmc", "use GMC", OFFSET(gmc), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VE },

863 { NULL },

864 };

865

866 static const AVClass xvid_class = {

867 .class_name = "libxvid",

868 .item_name = av_default_item_name,

869 .option = options,

870 .version = LIBAVUTIL_VERSION_INT,

871 };

872

873 AVCodec ff_libxvid_encoder = {

874 .name = "libxvid",

875 .long_name = NULL_IF_CONFIG_SMALL("libxvidcore MPEG-4 part 2"),

876 .type = AVMEDIA_TYPE_VIDEO,

877 .id = AV_CODEC_ID_MPEG4,

878 .priv_data_size = sizeof(struct xvid_context),

879 .init = xvid_encode_init,

880 .encode2 = xvid_encode_frame,

881 .close = xvid_encode_close,

882 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },

883 .priv_class = &xvid_class,

884 };

Generated on Sun Mar 8 2015 02:34:55 for FFmpeg by doxygen 1.8.2