1/* 2 * Interface to xvidcore for mpeg4 encoding 3 * Copyright (c) 2004 Adam Thayer <krevnik@comcast.net> 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 */ 21 22/** 23 * @file 24 * Interface to xvidcore for MPEG-4 compliant encoding. 25 * @author Adam Thayer (krevnik@comcast.net) 26 */ 27 28#include <xvid.h> 29#include <unistd.h> 30#include "avcodec.h" 31#include "libavutil/intreadwrite.h" 32#include "libxvid_internal.h" 33 34/** 35 * Buffer management macros. 36 */ 37#define BUFFER_SIZE 1024 38#define BUFFER_REMAINING(x) (BUFFER_SIZE - strlen(x)) 39#define BUFFER_CAT(x) (&((x)[strlen(x)])) 40 41/* For PPC Use */ 42int has_altivec(void); 43 44/** 45 * Structure for the private Xvid context. 46 * This stores all the private context for the codec. 47 */ 48struct xvid_context { 49 void *encoder_handle; /** Handle for Xvid encoder */ 50 int xsize, ysize; /** Frame size */ 51 int vop_flags; /** VOP flags for Xvid encoder */ 52 int vol_flags; /** VOL flags for Xvid encoder */ 53 int me_flags; /** Motion Estimation flags */ 54 int qscale; /** Do we use constant scale? */ 55 int quicktime_format; /** Are we in a QT-based format? */ 56 AVFrame encoded_picture; /** Encoded frame information */ 57 char *twopassbuffer; /** Character buffer for two-pass */ 58 char *old_twopassbuffer; /** Old character buffer (two-pass) */ 59 char *twopassfile; /** second pass temp file name */ 60 unsigned char *intra_matrix; /** P-Frame Quant Matrix */ 61 unsigned char *inter_matrix; /** I-Frame Quant Matrix */ 62}; 63 64/** 65 * Structure for the private first-pass plugin. 66 */ 67struct xvid_ff_pass1 { 68 int version; /** Xvid version */ 69 struct xvid_context *context; /** Pointer to private context */ 70}; 71 72/* Prototypes - See function implementation for details */ 73int xvid_strip_vol_header(AVCodecContext *avctx, unsigned char *frame, unsigned int header_len, unsigned int frame_len); 74int xvid_ff_2pass(void *ref, int opt, void *p1, void *p2); 75void xvid_correct_framerate(AVCodecContext *avctx); 76 77/** 78 * Creates the private context for the encoder. 79 * All buffers are allocated, settings are loaded from the user, 80 * and the encoder context created. 81 * 82 * @param avctx AVCodecContext pointer to context 83 * @return Returns 0 on success, -1 on failure 84 */ 85static av_cold int xvid_encode_init(AVCodecContext *avctx) { 86 int xerr, i; 87 int xvid_flags = avctx->flags; 88 struct xvid_context *x = avctx->priv_data; 89 uint16_t *intra, *inter; 90 int fd; 91 92 xvid_plugin_single_t single; 93 struct xvid_ff_pass1 rc2pass1; 94 xvid_plugin_2pass2_t rc2pass2; 95 xvid_gbl_init_t xvid_gbl_init; 96 xvid_enc_create_t xvid_enc_create; 97 xvid_enc_plugin_t plugins[7]; 98 99 /* Bring in VOP flags from ffmpeg command-line */ 100 x->vop_flags = XVID_VOP_HALFPEL; /* Bare minimum quality */ 101 if( xvid_flags & CODEC_FLAG_4MV ) 102 x->vop_flags |= XVID_VOP_INTER4V; /* Level 3 */ 103 if( avctx->trellis 104 ) 105 x->vop_flags |= XVID_VOP_TRELLISQUANT; /* Level 5 */ 106 if( xvid_flags & CODEC_FLAG_AC_PRED ) 107 x->vop_flags |= XVID_VOP_HQACPRED; /* Level 6 */ 108 if( xvid_flags & CODEC_FLAG_GRAY ) 109 x->vop_flags |= XVID_VOP_GREYSCALE; 110 111 /* Decide which ME quality setting to use */ 112 x->me_flags = 0; 113 switch( avctx->me_method ) { 114 case ME_FULL: /* Quality 6 */ 115 x->me_flags |= XVID_ME_EXTSEARCH16 116 | XVID_ME_EXTSEARCH8; 117 118 case ME_EPZS: /* Quality 4 */ 119 x->me_flags |= XVID_ME_ADVANCEDDIAMOND8 120 | XVID_ME_HALFPELREFINE8 121 | XVID_ME_CHROMA_PVOP 122 | XVID_ME_CHROMA_BVOP; 123 124 case ME_LOG: /* Quality 2 */ 125 case ME_PHODS: 126 case ME_X1: 127 x->me_flags |= XVID_ME_ADVANCEDDIAMOND16 128 | XVID_ME_HALFPELREFINE16; 129 130 case ME_ZERO: /* Quality 0 */ 131 default: 132 break; 133 } 134 135 /* Decide how we should decide blocks */ 136 switch( avctx->mb_decision ) { 137 case 2: 138 x->vop_flags |= XVID_VOP_MODEDECISION_RD; 139 x->me_flags |= XVID_ME_HALFPELREFINE8_RD 140 | XVID_ME_QUARTERPELREFINE8_RD 141 | XVID_ME_EXTSEARCH_RD 142 | XVID_ME_CHECKPREDICTION_RD; 143 case 1: 144 if( !(x->vop_flags & XVID_VOP_MODEDECISION_RD) ) 145 x->vop_flags |= XVID_VOP_FAST_MODEDECISION_RD; 146 x->me_flags |= XVID_ME_HALFPELREFINE16_RD 147 | XVID_ME_QUARTERPELREFINE16_RD; 148 149 default: 150 break; 151 } 152 153 /* Bring in VOL flags from ffmpeg command-line */ 154 x->vol_flags = 0; 155 if( xvid_flags & CODEC_FLAG_GMC ) { 156 x->vol_flags |= XVID_VOL_GMC; 157 x->me_flags |= XVID_ME_GME_REFINE; 158 } 159 if( xvid_flags & CODEC_FLAG_QPEL ) { 160 x->vol_flags |= XVID_VOL_QUARTERPEL; 161 x->me_flags |= XVID_ME_QUARTERPELREFINE16; 162 if( x->vop_flags & XVID_VOP_INTER4V ) 163 x->me_flags |= XVID_ME_QUARTERPELREFINE8; 164 } 165 166 memset(&xvid_gbl_init, 0, sizeof(xvid_gbl_init)); 167 xvid_gbl_init.version = XVID_VERSION; 168 xvid_gbl_init.debug = 0; 169 170#if ARCH_PPC 171 /* Xvid's PPC support is borked, use libavcodec to detect */ 172#if HAVE_ALTIVEC 173 if( has_altivec() ) { 174 xvid_gbl_init.cpu_flags = XVID_CPU_FORCE | XVID_CPU_ALTIVEC; 175 } else 176#endif 177 xvid_gbl_init.cpu_flags = XVID_CPU_FORCE; 178#else 179 /* Xvid can detect on x86 */ 180 xvid_gbl_init.cpu_flags = 0; 181#endif 182 183 /* Initialize */ 184 xvid_global(NULL, XVID_GBL_INIT, &xvid_gbl_init, NULL); 185 186 /* Create the encoder reference */ 187 memset(&xvid_enc_create, 0, sizeof(xvid_enc_create)); 188 xvid_enc_create.version = XVID_VERSION; 189 190 /* Store the desired frame size */ 191 xvid_enc_create.width = x->xsize = avctx->width; 192 xvid_enc_create.height = x->ysize = avctx->height; 193 194 /* Xvid can determine the proper profile to use */ 195 /* xvid_enc_create.profile = XVID_PROFILE_S_L3; */ 196 197 /* We don't use zones */ 198 xvid_enc_create.zones = NULL; 199 xvid_enc_create.num_zones = 0; 200 201 xvid_enc_create.num_threads = avctx->thread_count; 202 203 xvid_enc_create.plugins = plugins; 204 xvid_enc_create.num_plugins = 0; 205 206 /* Initialize Buffers */ 207 x->twopassbuffer = NULL; 208 x->old_twopassbuffer = NULL; 209 x->twopassfile = NULL; 210 211 if( xvid_flags & CODEC_FLAG_PASS1 ) { 212 memset(&rc2pass1, 0, sizeof(struct xvid_ff_pass1)); 213 rc2pass1.version = XVID_VERSION; 214 rc2pass1.context = x; 215 x->twopassbuffer = av_malloc(BUFFER_SIZE); 216 x->old_twopassbuffer = av_malloc(BUFFER_SIZE); 217 if( x->twopassbuffer == NULL || x->old_twopassbuffer == NULL ) { 218 av_log(avctx, AV_LOG_ERROR, 219 "Xvid: Cannot allocate 2-pass log buffers\n"); 220 return -1; 221 } 222 x->twopassbuffer[0] = x->old_twopassbuffer[0] = 0; 223 224 plugins[xvid_enc_create.num_plugins].func = xvid_ff_2pass; 225 plugins[xvid_enc_create.num_plugins].param = &rc2pass1; 226 xvid_enc_create.num_plugins++; 227 } else if( xvid_flags & CODEC_FLAG_PASS2 ) { 228 memset(&rc2pass2, 0, sizeof(xvid_plugin_2pass2_t)); 229 rc2pass2.version = XVID_VERSION; 230 rc2pass2.bitrate = avctx->bit_rate; 231 232 fd = av_tempfile("xvidff.", &(x->twopassfile)); 233 if( fd == -1 ) { 234 av_log(avctx, AV_LOG_ERROR, 235 "Xvid: Cannot write 2-pass pipe\n"); 236 return -1; 237 } 238 239 if( avctx->stats_in == NULL ) { 240 av_log(avctx, AV_LOG_ERROR, 241 "Xvid: No 2-pass information loaded for second pass\n"); 242 return -1; 243 } 244 245 if( strlen(avctx->stats_in) > 246 write(fd, avctx->stats_in, strlen(avctx->stats_in)) ) { 247 close(fd); 248 av_log(avctx, AV_LOG_ERROR, 249 "Xvid: Cannot write to 2-pass pipe\n"); 250 return -1; 251 } 252 253 close(fd); 254 rc2pass2.filename = x->twopassfile; 255 plugins[xvid_enc_create.num_plugins].func = xvid_plugin_2pass2; 256 plugins[xvid_enc_create.num_plugins].param = &rc2pass2; 257 xvid_enc_create.num_plugins++; 258 } else if( !(xvid_flags & CODEC_FLAG_QSCALE) ) { 259 /* Single Pass Bitrate Control! */ 260 memset(&single, 0, sizeof(xvid_plugin_single_t)); 261 single.version = XVID_VERSION; 262 single.bitrate = avctx->bit_rate; 263 264 plugins[xvid_enc_create.num_plugins].func = xvid_plugin_single; 265 plugins[xvid_enc_create.num_plugins].param = &single; 266 xvid_enc_create.num_plugins++; 267 } 268 269 /* Luminance Masking */ 270 if( 0.0 != avctx->lumi_masking ) { 271 plugins[xvid_enc_create.num_plugins].func = xvid_plugin_lumimasking; 272 plugins[xvid_enc_create.num_plugins].param = NULL; 273 xvid_enc_create.num_plugins++; 274 } 275 276 /* Frame Rate and Key Frames */ 277 xvid_correct_framerate(avctx); 278 xvid_enc_create.fincr = avctx->time_base.num; 279 xvid_enc_create.fbase = avctx->time_base.den; 280 if( avctx->gop_size > 0 ) 281 xvid_enc_create.max_key_interval = avctx->gop_size; 282 else 283 xvid_enc_create.max_key_interval = 240; /* Xvid's best default */ 284 285 /* Quants */ 286 if( xvid_flags & CODEC_FLAG_QSCALE ) x->qscale = 1; 287 else x->qscale = 0; 288 289 xvid_enc_create.min_quant[0] = avctx->qmin; 290 xvid_enc_create.min_quant[1] = avctx->qmin; 291 xvid_enc_create.min_quant[2] = avctx->qmin; 292 xvid_enc_create.max_quant[0] = avctx->qmax; 293 xvid_enc_create.max_quant[1] = avctx->qmax; 294 xvid_enc_create.max_quant[2] = avctx->qmax; 295 296 /* Quant Matrices */ 297 x->intra_matrix = x->inter_matrix = NULL; 298 if( avctx->mpeg_quant ) 299 x->vol_flags |= XVID_VOL_MPEGQUANT; 300 if( (avctx->intra_matrix || avctx->inter_matrix) ) { 301 x->vol_flags |= XVID_VOL_MPEGQUANT; 302 303 if( avctx->intra_matrix ) { 304 intra = avctx->intra_matrix; 305 x->intra_matrix = av_malloc(sizeof(unsigned char) * 64); 306 } else 307 intra = NULL; 308 if( avctx->inter_matrix ) { 309 inter = avctx->inter_matrix; 310 x->inter_matrix = av_malloc(sizeof(unsigned char) * 64); 311 } else 312 inter = NULL; 313 314 for( i = 0; i < 64; i++ ) { 315 if( intra ) 316 x->intra_matrix[i] = (unsigned char)intra[i]; 317 if( inter ) 318 x->inter_matrix[i] = (unsigned char)inter[i]; 319 } 320 } 321 322 /* Misc Settings */ 323 xvid_enc_create.frame_drop_ratio = 0; 324 xvid_enc_create.global = 0; 325 if( xvid_flags & CODEC_FLAG_CLOSED_GOP ) 326 xvid_enc_create.global |= XVID_GLOBAL_CLOSED_GOP; 327 328 /* Determines which codec mode we are operating in */ 329 avctx->extradata = NULL; 330 avctx->extradata_size = 0; 331 if( xvid_flags & CODEC_FLAG_GLOBAL_HEADER ) { 332 /* In this case, we are claiming to be MPEG4 */ 333 x->quicktime_format = 1; 334 avctx->codec_id = CODEC_ID_MPEG4; 335 } else { 336 /* We are claiming to be Xvid */ 337 x->quicktime_format = 0; 338 if(!avctx->codec_tag) 339 avctx->codec_tag = AV_RL32("xvid"); 340 } 341 342 /* Bframes */ 343 xvid_enc_create.max_bframes = avctx->max_b_frames; 344 xvid_enc_create.bquant_offset = 100 * avctx->b_quant_offset; 345 xvid_enc_create.bquant_ratio = 100 * avctx->b_quant_factor; 346 if( avctx->max_b_frames > 0 && !x->quicktime_format ) xvid_enc_create.global |= XVID_GLOBAL_PACKED; 347 348 /* Create encoder context */ 349 xerr = xvid_encore(NULL, XVID_ENC_CREATE, &xvid_enc_create, NULL); 350 if( xerr ) { 351 av_log(avctx, AV_LOG_ERROR, "Xvid: Could not create encoder reference\n"); 352 return -1; 353 } 354 355 x->encoder_handle = xvid_enc_create.handle; 356 avctx->coded_frame = &x->encoded_picture; 357 358 return 0; 359} 360 361/** 362 * Encodes a single frame. 363 * 364 * @param avctx AVCodecContext pointer to context 365 * @param frame Pointer to encoded frame buffer 366 * @param buf_size Size of encoded frame buffer 367 * @param data Pointer to AVFrame of unencoded frame 368 * @return Returns 0 on success, -1 on failure 369 */ 370static int xvid_encode_frame(AVCodecContext *avctx, 371 unsigned char *frame, int buf_size, void *data) { 372 int xerr, i; 373 char *tmp; 374 struct xvid_context *x = avctx->priv_data; 375 AVFrame *picture = data; 376 AVFrame *p = &(x->encoded_picture); 377 378 xvid_enc_frame_t xvid_enc_frame; 379 xvid_enc_stats_t xvid_enc_stats; 380 381 /* Start setting up the frame */ 382 memset(&xvid_enc_frame, 0, sizeof(xvid_enc_frame)); 383 xvid_enc_frame.version = XVID_VERSION; 384 memset(&xvid_enc_stats, 0, sizeof(xvid_enc_stats)); 385 xvid_enc_stats.version = XVID_VERSION; 386 *p = *picture; 387 388 /* Let Xvid know where to put the frame. */ 389 xvid_enc_frame.bitstream = frame; 390 xvid_enc_frame.length = buf_size; 391 392 /* Initialize input image fields */ 393 if( avctx->pix_fmt != PIX_FMT_YUV420P ) { 394 av_log(avctx, AV_LOG_ERROR, "Xvid: Color spaces other than 420p not supported\n"); 395 return -1; 396 } 397 398 xvid_enc_frame.input.csp = XVID_CSP_PLANAR; /* YUV420P */ 399 400 for( i = 0; i < 4; i++ ) { 401 xvid_enc_frame.input.plane[i] = picture->data[i]; 402 xvid_enc_frame.input.stride[i] = picture->linesize[i]; 403 } 404 405 /* Encoder Flags */ 406 xvid_enc_frame.vop_flags = x->vop_flags; 407 xvid_enc_frame.vol_flags = x->vol_flags; 408 xvid_enc_frame.motion = x->me_flags; 409 xvid_enc_frame.type = XVID_TYPE_AUTO; 410 411 /* Pixel aspect ratio setting */ 412 if (avctx->sample_aspect_ratio.num < 1 || avctx->sample_aspect_ratio.num > 255 || 413 avctx->sample_aspect_ratio.den < 1 || avctx->sample_aspect_ratio.den > 255) { 414 av_log(avctx, AV_LOG_ERROR, "Invalid pixel aspect ratio %i/%i\n", 415 avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den); 416 return -1; 417 } 418 xvid_enc_frame.par = XVID_PAR_EXT; 419 xvid_enc_frame.par_width = avctx->sample_aspect_ratio.num; 420 xvid_enc_frame.par_height = avctx->sample_aspect_ratio.den; 421 422 /* Quant Setting */ 423 if( x->qscale ) xvid_enc_frame.quant = picture->quality / FF_QP2LAMBDA; 424 else xvid_enc_frame.quant = 0; 425 426 /* Matrices */ 427 xvid_enc_frame.quant_intra_matrix = x->intra_matrix; 428 xvid_enc_frame.quant_inter_matrix = x->inter_matrix; 429 430 /* Encode */ 431 xerr = xvid_encore(x->encoder_handle, XVID_ENC_ENCODE, 432 &xvid_enc_frame, &xvid_enc_stats); 433 434 /* Two-pass log buffer swapping */ 435 avctx->stats_out = NULL; 436 if( x->twopassbuffer ) { 437 tmp = x->old_twopassbuffer; 438 x->old_twopassbuffer = x->twopassbuffer; 439 x->twopassbuffer = tmp; 440 x->twopassbuffer[0] = 0; 441 if( x->old_twopassbuffer[0] != 0 ) { 442 avctx->stats_out = x->old_twopassbuffer; 443 } 444 } 445 446 if( 0 <= xerr ) { 447 p->quality = xvid_enc_stats.quant * FF_QP2LAMBDA; 448 if( xvid_enc_stats.type == XVID_TYPE_PVOP ) 449 p->pict_type = FF_P_TYPE; 450 else if( xvid_enc_stats.type == XVID_TYPE_BVOP ) 451 p->pict_type = FF_B_TYPE; 452 else if( xvid_enc_stats.type == XVID_TYPE_SVOP ) 453 p->pict_type = FF_S_TYPE; 454 else 455 p->pict_type = FF_I_TYPE; 456 if( xvid_enc_frame.out_flags & XVID_KEYFRAME ) { 457 p->key_frame = 1; 458 if( x->quicktime_format ) 459 return xvid_strip_vol_header(avctx, frame, 460 xvid_enc_stats.hlength, xerr); 461 } else 462 p->key_frame = 0; 463 464 return xerr; 465 } else { 466 av_log(avctx, AV_LOG_ERROR, "Xvid: Encoding Error Occurred: %i\n", xerr); 467 return -1; 468 } 469} 470 471/** 472 * Destroys the private context for the encoder. 473 * All buffers are freed, and the Xvid encoder context is destroyed. 474 * 475 * @param avctx AVCodecContext pointer to context 476 * @return Returns 0, success guaranteed 477 */ 478static av_cold int xvid_encode_close(AVCodecContext *avctx) { 479 struct xvid_context *x = avctx->priv_data; 480 481 xvid_encore(x->encoder_handle, XVID_ENC_DESTROY, NULL, NULL); 482 483 if( avctx->extradata != NULL ) 484 av_freep(&avctx->extradata); 485 if( x->twopassbuffer != NULL ) { 486 av_free(x->twopassbuffer); 487 av_free(x->old_twopassbuffer); 488 } 489 if( x->twopassfile != NULL ) 490 av_free(x->twopassfile); 491 if( x->intra_matrix != NULL ) 492 av_free(x->intra_matrix); 493 if( x->inter_matrix != NULL ) 494 av_free(x->inter_matrix); 495 496 return 0; 497} 498 499/** 500 * Routine to create a global VO/VOL header for MP4 container. 501 * What we do here is extract the header from the Xvid bitstream 502 * as it is encoded. We also strip the repeated headers from the 503 * bitstream when a global header is requested for MPEG-4 ISO 504 * compliance. 505 * 506 * @param avctx AVCodecContext pointer to context 507 * @param frame Pointer to encoded frame data 508 * @param header_len Length of header to search 509 * @param frame_len Length of encoded frame data 510 * @return Returns new length of frame data 511 */ 512int xvid_strip_vol_header(AVCodecContext *avctx, 513 unsigned char *frame, 514 unsigned int header_len, 515 unsigned int frame_len) { 516 int vo_len = 0, i; 517 518 for( i = 0; i < header_len - 3; i++ ) { 519 if( frame[i] == 0x00 && 520 frame[i+1] == 0x00 && 521 frame[i+2] == 0x01 && 522 frame[i+3] == 0xB6 ) { 523 vo_len = i; 524 break; 525 } 526 } 527 528 if( vo_len > 0 ) { 529 /* We need to store the header, so extract it */ 530 if( avctx->extradata == NULL ) { 531 avctx->extradata = av_malloc(vo_len); 532 memcpy(avctx->extradata, frame, vo_len); 533 avctx->extradata_size = vo_len; 534 } 535 /* Less dangerous now, memmove properly copies the two 536 chunks of overlapping data */ 537 memmove(frame, &(frame[vo_len]), frame_len - vo_len); 538 return frame_len - vo_len; 539 } else 540 return frame_len; 541} 542 543/** 544 * Routine to correct a possibly erroneous framerate being fed to us. 545 * Xvid currently chokes on framerates where the ticks per frame is 546 * extremely large. This function works to correct problems in this area 547 * by estimating a new framerate and taking the simpler fraction of 548 * the two presented. 549 * 550 * @param avctx Context that contains the framerate to correct. 551 */ 552void xvid_correct_framerate(AVCodecContext *avctx) { 553 int frate, fbase; 554 int est_frate, est_fbase; 555 int gcd; 556 float est_fps, fps; 557 558 frate = avctx->time_base.den; 559 fbase = avctx->time_base.num; 560 561 gcd = av_gcd(frate, fbase); 562 if( gcd > 1 ) { 563 frate /= gcd; 564 fbase /= gcd; 565 } 566 567 if( frate <= 65000 && fbase <= 65000 ) { 568 avctx->time_base.den = frate; 569 avctx->time_base.num = fbase; 570 return; 571 } 572 573 fps = (float)frate / (float)fbase; 574 est_fps = roundf(fps * 1000.0) / 1000.0; 575 576 est_frate = (int)est_fps; 577 if( est_fps > (int)est_fps ) { 578 est_frate = (est_frate + 1) * 1000; 579 est_fbase = (int)roundf((float)est_frate / est_fps); 580 } else 581 est_fbase = 1; 582 583 gcd = av_gcd(est_frate, est_fbase); 584 if( gcd > 1 ) { 585 est_frate /= gcd; 586 est_fbase /= gcd; 587 } 588 589 if( fbase > est_fbase ) { 590 avctx->time_base.den = est_frate; 591 avctx->time_base.num = est_fbase; 592 av_log(avctx, AV_LOG_DEBUG, 593 "Xvid: framerate re-estimated: %.2f, %.3f%% correction\n", 594 est_fps, (((est_fps - fps)/fps) * 100.0)); 595 } else { 596 avctx->time_base.den = frate; 597 avctx->time_base.num = fbase; 598 } 599} 600 601/* 602 * Xvid 2-Pass Kludge Section 603 * 604 * Xvid's default 2-pass doesn't allow us to create data as we need to, so 605 * this section spends time replacing the first pass plugin so we can write 606 * statistic information as libavcodec requests in. We have another kludge 607 * that allows us to pass data to the second pass in Xvid without a custom 608 * rate-control plugin. 609 */ 610 611/** 612 * Initializes the two-pass plugin and context. 613 * 614 * @param param Input construction parameter structure 615 * @param handle Private context handle 616 * @return Returns XVID_ERR_xxxx on failure, or 0 on success. 617 */ 618static int xvid_ff_2pass_create(xvid_plg_create_t * param, 619 void ** handle) { 620 struct xvid_ff_pass1 *x = (struct xvid_ff_pass1 *)param->param; 621 char *log = x->context->twopassbuffer; 622 623 /* Do a quick bounds check */ 624 if( log == NULL ) 625 return XVID_ERR_FAIL; 626 627 /* We use snprintf() */ 628 /* This is because we can safely prevent a buffer overflow */ 629 log[0] = 0; 630 snprintf(log, BUFFER_REMAINING(log), 631 "# ffmpeg 2-pass log file, using xvid codec\n"); 632 snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log), 633 "# Do not modify. libxvidcore version: %d.%d.%d\n\n", 634 XVID_VERSION_MAJOR(XVID_VERSION), 635 XVID_VERSION_MINOR(XVID_VERSION), 636 XVID_VERSION_PATCH(XVID_VERSION)); 637 638 *handle = x->context; 639 return 0; 640} 641 642/** 643 * Destroys the two-pass plugin context. 644 * 645 * @param ref Context pointer for the plugin 646 * @param param Destrooy context 647 * @return Returns 0, success guaranteed 648 */ 649static int xvid_ff_2pass_destroy(struct xvid_context *ref, 650 xvid_plg_destroy_t *param) { 651 /* Currently cannot think of anything to do on destruction */ 652 /* Still, the framework should be here for reference/use */ 653 if( ref->twopassbuffer != NULL ) 654 ref->twopassbuffer[0] = 0; 655 return 0; 656} 657 658/** 659 * Enables fast encode mode during the first pass. 660 * 661 * @param ref Context pointer for the plugin 662 * @param param Frame data 663 * @return Returns 0, success guaranteed 664 */ 665static int xvid_ff_2pass_before(struct xvid_context *ref, 666 xvid_plg_data_t *param) { 667 int motion_remove; 668 int motion_replacements; 669 int vop_remove; 670 671 /* Nothing to do here, result is changed too much */ 672 if( param->zone && param->zone->mode == XVID_ZONE_QUANT ) 673 return 0; 674 675 /* We can implement a 'turbo' first pass mode here */ 676 param->quant = 2; 677 678 /* Init values */ 679 motion_remove = ~XVID_ME_CHROMA_PVOP & 680 ~XVID_ME_CHROMA_BVOP & 681 ~XVID_ME_EXTSEARCH16 & 682 ~XVID_ME_ADVANCEDDIAMOND16; 683 motion_replacements = XVID_ME_FAST_MODEINTERPOLATE | 684 XVID_ME_SKIP_DELTASEARCH | 685 XVID_ME_FASTREFINE16 | 686 XVID_ME_BFRAME_EARLYSTOP; 687 vop_remove = ~XVID_VOP_MODEDECISION_RD & 688 ~XVID_VOP_FAST_MODEDECISION_RD & 689 ~XVID_VOP_TRELLISQUANT & 690 ~XVID_VOP_INTER4V & 691 ~XVID_VOP_HQACPRED; 692 693 param->vol_flags &= ~XVID_VOL_GMC; 694 param->vop_flags &= vop_remove; 695 param->motion_flags &= motion_remove; 696 param->motion_flags |= motion_replacements; 697 698 return 0; 699} 700 701/** 702 * Captures statistic data and writes it during first pass. 703 * 704 * @param ref Context pointer for the plugin 705 * @param param Statistic data 706 * @return Returns XVID_ERR_xxxx on failure, or 0 on success 707 */ 708static int xvid_ff_2pass_after(struct xvid_context *ref, 709 xvid_plg_data_t *param) { 710 char *log = ref->twopassbuffer; 711 char *frame_types = " ipbs"; 712 char frame_type; 713 714 /* Quick bounds check */ 715 if( log == NULL ) 716 return XVID_ERR_FAIL; 717 718 /* Convert the type given to us into a character */ 719 if( param->type < 5 && param->type > 0 ) { 720 frame_type = frame_types[param->type]; 721 } else { 722 return XVID_ERR_FAIL; 723 } 724 725 snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log), 726 "%c %d %d %d %d %d %d\n", 727 frame_type, param->stats.quant, param->stats.kblks, param->stats.mblks, 728 param->stats.ublks, param->stats.length, param->stats.hlength); 729 730 return 0; 731} 732 733/** 734 * Dispatch function for our custom plugin. 735 * This handles the dispatch for the Xvid plugin. It passes data 736 * on to other functions for actual processing. 737 * 738 * @param ref Context pointer for the plugin 739 * @param cmd The task given for us to complete 740 * @param p1 First parameter (varies) 741 * @param p2 Second parameter (varies) 742 * @return Returns XVID_ERR_xxxx on failure, or 0 on success 743 */ 744int xvid_ff_2pass(void *ref, int cmd, void *p1, void *p2) { 745 switch( cmd ) { 746 case XVID_PLG_INFO: 747 case XVID_PLG_FRAME: 748 return 0; 749 750 case XVID_PLG_BEFORE: 751 return xvid_ff_2pass_before(ref, p1); 752 753 case XVID_PLG_CREATE: 754 return xvid_ff_2pass_create(p1, p2); 755 756 case XVID_PLG_AFTER: 757 return xvid_ff_2pass_after(ref, p1); 758 759 case XVID_PLG_DESTROY: 760 return xvid_ff_2pass_destroy(ref, p1); 761 762 default: 763 return XVID_ERR_FAIL; 764 } 765} 766 767/** 768 * Xvid codec definition for libavcodec. 769 */ 770AVCodec libxvid_encoder = { 771 "libxvid", 772 AVMEDIA_TYPE_VIDEO, 773 CODEC_ID_MPEG4, 774 sizeof(struct xvid_context), 775 xvid_encode_init, 776 xvid_encode_frame, 777 xvid_encode_close, 778 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE}, 779 .long_name= NULL_IF_CONFIG_SMALL("libxvidcore MPEG-4 part 2"), 780}; 781