FFmpeg: libavcodec/libxvid.c Source File

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libxvid.c

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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>

29 #include <unistd.h>

30 #include "avcodec.h"

31 #include "internal.h"

32 #include "libavutil/file.h"

33 #include "libavutil/cpu.h"

34 #include "libavutil/intreadwrite.h"

35 #include "libavutil/mathematics.h"

36 #include "libxvid.h"

37 #include "mpegvideo.h"

39 /**

40 * Buffer management macros.

41 */

42 #define BUFFER_SIZE 1024

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

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

46 /**

47 * Structure for the private Xvid context.

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

49 */

50 struct xvid_context {

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

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

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

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

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

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

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

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

59 AVFrame encoded_picture; /**< Encoded frame information */

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

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

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

63 int twopassfd;

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

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

66 };

68 /**

69 * Structure for the private first-pass plugin.

70 */

71 struct xvid_ff_pass1 {

72 int version; /**< Xvid version */

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

74 };

76 static int xvid_encode_close(AVCodecContext *avctx);

78 /*

79 * Xvid 2-Pass Kludge Section

80 *

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

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

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

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

85 * rate-control plugin.

86 */

88 /**

89 * Initialize the two-pass plugin and context.

90 *

91 * @param param Input construction parameter structure

92 * @param handle Private context handle

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

94 */

95 static int xvid_ff_2pass_create(xvid_plg_create_t * param,

96 void ** handle) {

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

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

100 /* Do a quick bounds check */

101 if( log == NULL )

102 return XVID_ERR_FAIL;

103

104 /* We use snprintf() */

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

106 log[0] = 0;

107 snprintf(log, BUFFER_REMAINING(log),

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

109 snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),

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

111 XVID_VERSION_MAJOR(XVID_VERSION),

112 XVID_VERSION_MINOR(XVID_VERSION),

113 XVID_VERSION_PATCH(XVID_VERSION));

114

115 *handle = x->context;

116 return 0;

117 }

118

119 /**

120 * Destroy the two-pass plugin context.

121 *

122 * @param ref Context pointer for the plugin

123 * @param param Destrooy context

124 * @return Returns 0, success guaranteed

125 */

126 static int xvid_ff_2pass_destroy(struct xvid_context *ref,

127 xvid_plg_destroy_t *param) {

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

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

130 if( ref->twopassbuffer != NULL )

131 ref->twopassbuffer[0] = 0;

132 return 0;

133 }

134

135 /**

136 * Enable fast encode mode during the first pass.

137 *

138 * @param ref Context pointer for the plugin

139 * @param param Frame data

140 * @return Returns 0, success guaranteed

141 */

142 static int xvid_ff_2pass_before(struct xvid_context *ref,

143 xvid_plg_data_t *param) {

144 int motion_remove;

145 int motion_replacements;

146 int vop_remove;

147

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

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

150 return 0;

151

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

153 param->quant = 2;

154

155 /* Init values */

156 motion_remove = ~XVID_ME_CHROMA_PVOP &

157 ~XVID_ME_CHROMA_BVOP &

158 ~XVID_ME_EXTSEARCH16 &

159 ~XVID_ME_ADVANCEDDIAMOND16;

160 motion_replacements = XVID_ME_FAST_MODEINTERPOLATE |

161 XVID_ME_SKIP_DELTASEARCH |

162 XVID_ME_FASTREFINE16 |

163 XVID_ME_BFRAME_EARLYSTOP;

164 vop_remove = ~XVID_VOP_MODEDECISION_RD &

165 ~XVID_VOP_FAST_MODEDECISION_RD &

166 ~XVID_VOP_TRELLISQUANT &

167 ~XVID_VOP_INTER4V &

168 ~XVID_VOP_HQACPRED;

169

170 param->vol_flags &= ~XVID_VOL_GMC;

171 param->vop_flags &= vop_remove;

172 param->motion_flags &= motion_remove;

173 param->motion_flags |= motion_replacements;

174

175 return 0;

176 }

177

178 /**

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

180 *

181 * @param ref Context pointer for the plugin

182 * @param param Statistic data

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

184 */

185 static int xvid_ff_2pass_after(struct xvid_context *ref,

186 xvid_plg_data_t *param) {

187 char *log = ref->twopassbuffer;

188 const char *frame_types = " ipbs";

189 char frame_type;

190

191 /* Quick bounds check */

192 if( log == NULL )

193 return XVID_ERR_FAIL;

194

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

196 if( param->type < 5 && param->type > 0 ) {

197 frame_type = frame_types[param->type];

198 } else {

199 return XVID_ERR_FAIL;

200 }

201

202 snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),

203 "%c %d %d %d %d %d %d\n",

204 frame_type, param->stats.quant, param->stats.kblks, param->stats.mblks,

205 param->stats.ublks, param->stats.length, param->stats.hlength);

206

207 return 0;

208 }

209

210 /**

211 * Dispatch function for our custom plugin.

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

213 * on to other functions for actual processing.

214 *

215 * @param ref Context pointer for the plugin

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

217 * @param p1 First parameter (varies)

218 * @param p2 Second parameter (varies)

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

220 */

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

222 {

223 switch( cmd ) {

224 case XVID_PLG_INFO:

225 case XVID_PLG_FRAME:

226 return 0;

227

228 case XVID_PLG_BEFORE:

229 return xvid_ff_2pass_before(ref, p1);

230

231 case XVID_PLG_CREATE:

232 return xvid_ff_2pass_create(p1, p2);

233

234 case XVID_PLG_AFTER:

235 return xvid_ff_2pass_after(ref, p1);

236

237 case XVID_PLG_DESTROY:

238 return xvid_ff_2pass_destroy(ref, p1);

239

240 default:

241 return XVID_ERR_FAIL;

242 }

243 }

244

245 /**

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

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

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

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

250 * compliance.

251 *

252 * @param avctx AVCodecContext pointer to context

253 * @param frame Pointer to encoded frame data

254 * @param header_len Length of header to search

255 * @param frame_len Length of encoded frame data

256 * @return Returns new length of frame data

257 */

258 static int xvid_strip_vol_header(AVCodecContext *avctx,

259 AVPacket *pkt,

260 unsigned int header_len,

261 unsigned int frame_len) {

262 int vo_len = 0, i;

263

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

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

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

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

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

269 vo_len = i;

270 break;

271 }

272 }

273

274 if( vo_len > 0 ) {

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

276 if( avctx->extradata == NULL ) {

277 avctx->extradata = av_malloc(vo_len);

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

279 avctx->extradata_size = vo_len;

280 }

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

282 chunks of overlapping data */

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

284 pkt->size = frame_len - vo_len;

285 }

286 return 0;

287 }

288

289 /**

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

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

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

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

294 * the two presented.

295 *

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

297 */

298 static void xvid_correct_framerate(AVCodecContext *avctx)

299 {

300 int frate, fbase;

301 int est_frate, est_fbase;

302 int gcd;

303 float est_fps, fps;

304

305 frate = avctx->time_base.den;

306 fbase = avctx->time_base.num;

307

308 gcd = av_gcd(frate, fbase);

309 if( gcd > 1 ) {

310 frate /= gcd;

311 fbase /= gcd;

312 }

313

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

315 avctx->time_base.den = frate;

316 avctx->time_base.num = fbase;

317 return;

318 }

319

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

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

322

323 est_frate = (int)est_fps;

324 if( est_fps > (int)est_fps ) {

325 est_frate = (est_frate + 1) * 1000;

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

327 } else

328 est_fbase = 1;

329

330 gcd = av_gcd(est_frate, est_fbase);

331 if( gcd > 1 ) {

332 est_frate /= gcd;

333 est_fbase /= gcd;

334 }

335

336 if( fbase > est_fbase ) {

337 avctx->time_base.den = est_frate;

338 avctx->time_base.num = est_fbase;

339 av_log(avctx, AV_LOG_DEBUG,

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

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

342 } else {

343 avctx->time_base.den = frate;

344 avctx->time_base.num = fbase;

345 }

346 }

347

348 static av_cold int xvid_encode_init(AVCodecContext *avctx) {

349 int xerr, i;

350 int xvid_flags = avctx->flags;

351 struct xvid_context *x = avctx->priv_data;

352 uint16_t *intra, *inter;

353 int fd;

354

355 xvid_plugin_single_t single = { 0 };

356 struct xvid_ff_pass1 rc2pass1 = { 0 };

357 xvid_plugin_2pass2_t rc2pass2 = { 0 };

358 xvid_gbl_init_t xvid_gbl_init = { 0 };

359 xvid_enc_create_t xvid_enc_create = { 0 };

360 xvid_enc_plugin_t plugins[7];

361

362 x->twopassfd = -1;

363

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

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

366 if( xvid_flags & CODEC_FLAG_4MV )

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

368 if( avctx->trellis

369 )

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

371 if( xvid_flags & CODEC_FLAG_AC_PRED )

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

373 if( xvid_flags & CODEC_FLAG_GRAY )

374 x->vop_flags |= XVID_VOP_GREYSCALE;

375

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

377 x->me_flags = 0;

378 switch( avctx->me_method ) {

379 case ME_FULL: /* Quality 6 */

380 x->me_flags |= XVID_ME_EXTSEARCH16

381 | XVID_ME_EXTSEARCH8;

382

383 case ME_EPZS: /* Quality 4 */

384 x->me_flags |= XVID_ME_ADVANCEDDIAMOND8

385 | XVID_ME_HALFPELREFINE8

386 | XVID_ME_CHROMA_PVOP

387 | XVID_ME_CHROMA_BVOP;

388

389 case ME_LOG: /* Quality 2 */

390 case ME_PHODS:

391 case ME_X1:

392 x->me_flags |= XVID_ME_ADVANCEDDIAMOND16

393 | XVID_ME_HALFPELREFINE16;

394

395 case ME_ZERO: /* Quality 0 */

396 default:

397 break;

398 }

399

400 /* Decide how we should decide blocks */

401 switch( avctx->mb_decision ) {

402 case 2:

403 x->vop_flags |= XVID_VOP_MODEDECISION_RD;

404 x->me_flags |= XVID_ME_HALFPELREFINE8_RD

405 | XVID_ME_QUARTERPELREFINE8_RD

406 | XVID_ME_EXTSEARCH_RD

407 | XVID_ME_CHECKPREDICTION_RD;

408 case 1:

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

410 x->vop_flags |= XVID_VOP_FAST_MODEDECISION_RD;

411 x->me_flags |= XVID_ME_HALFPELREFINE16_RD

412 | XVID_ME_QUARTERPELREFINE16_RD;

413

414 default:

415 break;

416 }

417

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

419 x->vol_flags = 0;

420 if( xvid_flags & CODEC_FLAG_GMC ) {

421 x->vol_flags |= XVID_VOL_GMC;

422 x->me_flags |= XVID_ME_GME_REFINE;

423 }

424 if( xvid_flags & CODEC_FLAG_QPEL ) {

425 x->vol_flags |= XVID_VOL_QUARTERPEL;

426 x->me_flags |= XVID_ME_QUARTERPELREFINE16;

427 if( x->vop_flags & XVID_VOP_INTER4V )

428 x->me_flags |= XVID_ME_QUARTERPELREFINE8;

429 }

430

431 xvid_gbl_init.version = XVID_VERSION;

432 xvid_gbl_init.debug = 0;

433

434 #if ARCH_PPC

435 /* Xvid's PPC support is borked, use libavcodec to detect */

436 #if HAVE_ALTIVEC

437 if (av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC) {

438 xvid_gbl_init.cpu_flags = XVID_CPU_FORCE | XVID_CPU_ALTIVEC;

439 } else

440 #endif

441 xvid_gbl_init.cpu_flags = XVID_CPU_FORCE;

442 #else

443 /* Xvid can detect on x86 */

444 xvid_gbl_init.cpu_flags = 0;

445 #endif

446

447 /* Initialize */

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

449

450 /* Create the encoder reference */

451 xvid_enc_create.version = XVID_VERSION;

452

453 /* Store the desired frame size */

454 xvid_enc_create.width = x->xsize = avctx->width;

455 xvid_enc_create.height = x->ysize = avctx->height;

456

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

458 /* xvid_enc_create.profile = XVID_PROFILE_S_L3; */

459

460 /* We don't use zones */

461 xvid_enc_create.zones = NULL;

462 xvid_enc_create.num_zones = 0;

463

464 xvid_enc_create.num_threads = avctx->thread_count;

465

466 xvid_enc_create.plugins = plugins;

467 xvid_enc_create.num_plugins = 0;

468

469 /* Initialize Buffers */

470 x->twopassbuffer = NULL;

471 x->old_twopassbuffer = NULL;

472 x->twopassfile = NULL;

473

474 if( xvid_flags & CODEC_FLAG_PASS1 ) {

475 rc2pass1.version = XVID_VERSION;

476 rc2pass1.context = x;

477 x->twopassbuffer = av_malloc(BUFFER_SIZE);

478 x->old_twopassbuffer = av_malloc(BUFFER_SIZE);

479 if( x->twopassbuffer == NULL || x->old_twopassbuffer == NULL ) {

480 av_log(avctx, AV_LOG_ERROR,

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

482 goto fail;

483 }

484 x->twopassbuffer[0] = x->old_twopassbuffer[0] = 0;

485

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

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

488 xvid_enc_create.num_plugins++;

489 } else if( xvid_flags & CODEC_FLAG_PASS2 ) {

490 rc2pass2.version = XVID_VERSION;

491 rc2pass2.bitrate = avctx->bit_rate;

492

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

494 if( fd == -1 ) {

495 av_log(avctx, AV_LOG_ERROR,

496 "Xvid: Cannot write 2-pass pipe\n");

497 goto fail;

498 }

499 x->twopassfd = fd;

500

501 if( avctx->stats_in == NULL ) {

502 av_log(avctx, AV_LOG_ERROR,

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

504 goto fail;

505 }

506

507 if( strlen(avctx->stats_in) >

508 write(fd, avctx->stats_in, strlen(avctx->stats_in)) ) {

509 av_log(avctx, AV_LOG_ERROR,

510 "Xvid: Cannot write to 2-pass pipe\n");

511 goto fail;

512 }

513

514 rc2pass2.filename = x->twopassfile;

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

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

517 xvid_enc_create.num_plugins++;

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

519 /* Single Pass Bitrate Control! */

520 single.version = XVID_VERSION;

521 single.bitrate = avctx->bit_rate;

522

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

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

525 xvid_enc_create.num_plugins++;

526 }

527

528 /* Luminance Masking */

529 if( 0.0 != avctx->lumi_masking ) {

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

531 plugins[xvid_enc_create.num_plugins].param = NULL;

532 xvid_enc_create.num_plugins++;

533 }

534

535 /* Frame Rate and Key Frames */

536 xvid_correct_framerate(avctx);

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

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

539 if( avctx->gop_size > 0 )

540 xvid_enc_create.max_key_interval = avctx->gop_size;

541 else

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

543

544 /* Quants */

545 if( xvid_flags & CODEC_FLAG_QSCALE ) x->qscale = 1;

546 else x->qscale = 0;

547

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

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

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

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

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

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

554

555 /* Quant Matrices */

556 x->intra_matrix = x->inter_matrix = NULL;

557 if( avctx->mpeg_quant )

558 x->vol_flags |= XVID_VOL_MPEGQUANT;

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

560 x->vol_flags |= XVID_VOL_MPEGQUANT;

561

562 if( avctx->intra_matrix ) {

563 intra = avctx->intra_matrix;

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

565 } else

566 intra = NULL;

567 if( avctx->inter_matrix ) {

568 inter = avctx->inter_matrix;

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

570 } else

571 inter = NULL;

572

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

574 if( intra )

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

576 if( inter )

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

578 }

579 }

580

581 /* Misc Settings */

582 xvid_enc_create.frame_drop_ratio = 0;

583 xvid_enc_create.global = 0;

584 if( xvid_flags & CODEC_FLAG_CLOSED_GOP )

585 xvid_enc_create.global |= XVID_GLOBAL_CLOSED_GOP;

586

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

588 avctx->extradata = NULL;

589 avctx->extradata_size = 0;

590 if( xvid_flags & CODEC_FLAG_GLOBAL_HEADER ) {

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

592 x->quicktime_format = 1;

593 avctx->codec_id = AV_CODEC_ID_MPEG4;

594 } else {

595 /* We are claiming to be Xvid */

596 x->quicktime_format = 0;

597 if(!avctx->codec_tag)

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

599 }

600

601 /* Bframes */

602 xvid_enc_create.max_bframes = avctx->max_b_frames;

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

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

605 if( avctx->max_b_frames > 0 && !x->quicktime_format ) xvid_enc_create.global |= XVID_GLOBAL_PACKED;

606

607 /* Create encoder context */

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

609 if( xerr ) {

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

611 goto fail;

612 }

613

614 x->encoder_handle = xvid_enc_create.handle;

615 avctx->coded_frame = &x->encoded_picture;

616

617 return 0;

618 fail:

619 xvid_encode_close(avctx);

620 return -1;

621 }

622

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

624 const AVFrame *picture, int *got_packet)

625 {

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

627 char *tmp;

628 struct xvid_context *x = avctx->priv_data;

629 AVFrame *p = &x->encoded_picture;

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

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

632

633 xvid_enc_frame_t xvid_enc_frame = { 0 };

634 xvid_enc_stats_t xvid_enc_stats = { 0 };

635

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

637 return ret;

638

639 /* Start setting up the frame */

640 xvid_enc_frame.version = XVID_VERSION;

641 xvid_enc_stats.version = XVID_VERSION;

642 *p = *picture;

643

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

645 xvid_enc_frame.bitstream = pkt->data;

646 xvid_enc_frame.length = pkt->size;

647

648 /* Initialize input image fields */

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

650 av_log(avctx, AV_LOG_ERROR, "Xvid: Color spaces other than 420p not supported\n");

651 return -1;

652 }

653

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

655

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

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

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

659 }

660

661 /* Encoder Flags */

662 xvid_enc_frame.vop_flags = x->vop_flags;

663 xvid_enc_frame.vol_flags = x->vol_flags;

664 xvid_enc_frame.motion = x->me_flags;

665 xvid_enc_frame.type =

666 picture->pict_type == AV_PICTURE_TYPE_I ? XVID_TYPE_IVOP :

667 picture->pict_type == AV_PICTURE_TYPE_P ? XVID_TYPE_PVOP :

668 picture->pict_type == AV_PICTURE_TYPE_B ? XVID_TYPE_BVOP :

669 XVID_TYPE_AUTO;

670

671 /* Pixel aspect ratio setting */

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

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

674 av_log(avctx, AV_LOG_ERROR, "Invalid pixel aspect ratio %i/%i\n",

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

676 return -1;

677 }

678 xvid_enc_frame.par = XVID_PAR_EXT;

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

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

681

682 /* Quant Setting */

683 if( x->qscale ) xvid_enc_frame.quant = picture->quality / FF_QP2LAMBDA;

684 else xvid_enc_frame.quant = 0;

685

686 /* Matrices */

687 xvid_enc_frame.quant_intra_matrix = x->intra_matrix;

688 xvid_enc_frame.quant_inter_matrix = x->inter_matrix;

689

690 /* Encode */

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

692 &xvid_enc_frame, &xvid_enc_stats);

693

694 /* Two-pass log buffer swapping */

695 avctx->stats_out = NULL;

696 if( x->twopassbuffer ) {

697 tmp = x->old_twopassbuffer;

698 x->old_twopassbuffer = x->twopassbuffer;

699 x->twopassbuffer = tmp;

700 x->twopassbuffer[0] = 0;

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

702 avctx->stats_out = x->old_twopassbuffer;

703 }

704 }

705

706 if (xerr > 0) {

707 *got_packet = 1;

708

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

710 if( xvid_enc_stats.type == XVID_TYPE_PVOP )

711 p->pict_type = AV_PICTURE_TYPE_P;

712 else if( xvid_enc_stats.type == XVID_TYPE_BVOP )

713 p->pict_type = AV_PICTURE_TYPE_B;

714 else if( xvid_enc_stats.type == XVID_TYPE_SVOP )

715 p->pict_type = AV_PICTURE_TYPE_S;

716 else

717 p->pict_type = AV_PICTURE_TYPE_I;

718 if( xvid_enc_frame.out_flags & XVID_KEYFRAME ) {

719 p->key_frame = 1;

720 pkt->flags |= AV_PKT_FLAG_KEY;

721 if( x->quicktime_format )

722 return xvid_strip_vol_header(avctx, pkt,

723 xvid_enc_stats.hlength, xerr);

724 } else

725 p->key_frame = 0;

726

727 pkt->size = xerr;

728

729 return 0;

730 } else {

731 if (!user_packet)

732 av_free_packet(pkt);

733 if (!xerr)

734 return 0;

735 av_log(avctx, AV_LOG_ERROR, "Xvid: Encoding Error Occurred: %i\n", xerr);

736 return -1;

737 }

738 }

739

740 static av_cold int xvid_encode_close(AVCodecContext *avctx) {

741 struct xvid_context *x = avctx->priv_data;

742

743 if(x->encoder_handle)

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

745 x->encoder_handle = NULL;

746

747 av_freep(&avctx->extradata);

748 if( x->twopassbuffer != NULL ) {

749 av_freep(&x->twopassbuffer);

750 av_freep(&x->old_twopassbuffer);

751 avctx->stats_out = NULL;

752 }

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

754 unlink(x->twopassfile);

755 close(x->twopassfd);

756 x->twopassfd = -1;

757 }

758 av_freep(&x->twopassfile);

759 av_freep(&x->intra_matrix);

760 av_freep(&x->inter_matrix);

761

762 return 0;

763 }

764

765 AVCodec ff_libxvid_encoder = {

766 .name = "libxvid",

767 .type = AVMEDIA_TYPE_VIDEO,

768 .id = AV_CODEC_ID_MPEG4,

769 .priv_data_size = sizeof(struct xvid_context),

770 .init = xvid_encode_init,

771 .encode2 = xvid_encode_frame,

772 .close = xvid_encode_close,

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

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

775 };

Generated on Wed Jul 10 2013 23:48:00 for FFmpeg by doxygen 1.8.2