1/* 2 * Interface to xvidcore for mpeg4 encoding 3 * Copyright (c) 2004 Adam Thayer <krevnik@comcast.net> 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; 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/cpu.h" 32#include "libavutil/intreadwrite.h" 33#include "libavutil/mathematics.h" 34#include "libxvid_internal.h" 35#if !HAVE_MKSTEMP 36#include <fcntl.h> 37#endif 38 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)])) 45 46/** 47 * Structure for the private Xvid context. 48 * This stores all the private context for the codec. 49 */ 50struct 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 unsigned char *intra_matrix; /**< P-Frame Quant Matrix */ 64 unsigned char *inter_matrix; /**< I-Frame Quant Matrix */ 65}; 66 67/** 68 * Structure for the private first-pass plugin. 69 */ 70struct xvid_ff_pass1 { 71 int version; /**< Xvid version */ 72 struct xvid_context *context; /**< Pointer to private context */ 73}; 74 75/* Prototypes - See function implementation for details */ 76int xvid_strip_vol_header(AVCodecContext *avctx, unsigned char *frame, unsigned int header_len, unsigned int frame_len); 77int xvid_ff_2pass(void *ref, int opt, void *p1, void *p2); 78void xvid_correct_framerate(AVCodecContext *avctx); 79 80/* Wrapper to work around the lack of mkstemp() on mingw. 81 * Also, tries to create file in /tmp first, if possible. 82 * *prefix can be a character constant; *filename will be allocated internally. 83 * @return file descriptor of opened file (or -1 on error) 84 * and opened file name in **filename. */ 85int ff_tempfile(const char *prefix, char **filename) { 86 int fd=-1; 87#if !HAVE_MKSTEMP 88 *filename = tempnam(".", prefix); 89#else 90 size_t len = strlen(prefix) + 12; /* room for "/tmp/" and "XXXXXX\0" */ 91 *filename = av_malloc(len); 92#endif 93 /* -----common section-----*/ 94 if (*filename == NULL) { 95 av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot allocate file name\n"); 96 return -1; 97 } 98#if !HAVE_MKSTEMP 99 fd = open(*filename, O_RDWR | O_BINARY | O_CREAT, 0444); 100#else 101 snprintf(*filename, len, "/tmp/%sXXXXXX", prefix); 102 fd = mkstemp(*filename); 103 if (fd < 0) { 104 snprintf(*filename, len, "./%sXXXXXX", prefix); 105 fd = mkstemp(*filename); 106 } 107#endif 108 /* -----common section-----*/ 109 if (fd < 0) { 110 av_log(NULL, AV_LOG_ERROR, "ff_tempfile: Cannot open temporary file %s\n", *filename); 111 return -1; 112 } 113 return fd; /* success */ 114} 115 116#if CONFIG_LIBXVID_ENCODER 117 118/** 119 * Create the private context for the encoder. 120 * All buffers are allocated, settings are loaded from the user, 121 * and the encoder context created. 122 * 123 * @param avctx AVCodecContext pointer to context 124 * @return Returns 0 on success, -1 on failure 125 */ 126static av_cold int xvid_encode_init(AVCodecContext *avctx) { 127 int xerr, i; 128 int xvid_flags = avctx->flags; 129 struct xvid_context *x = avctx->priv_data; 130 uint16_t *intra, *inter; 131 int fd; 132 133 xvid_plugin_single_t single; 134 struct xvid_ff_pass1 rc2pass1; 135 xvid_plugin_2pass2_t rc2pass2; 136 xvid_gbl_init_t xvid_gbl_init; 137 xvid_enc_create_t xvid_enc_create; 138 xvid_enc_plugin_t plugins[7]; 139 140 /* Bring in VOP flags from avconv command-line */ 141 x->vop_flags = XVID_VOP_HALFPEL; /* Bare minimum quality */ 142 if( xvid_flags & CODEC_FLAG_4MV ) 143 x->vop_flags |= XVID_VOP_INTER4V; /* Level 3 */ 144 if( avctx->trellis 145 ) 146 x->vop_flags |= XVID_VOP_TRELLISQUANT; /* Level 5 */ 147 if( xvid_flags & CODEC_FLAG_AC_PRED ) 148 x->vop_flags |= XVID_VOP_HQACPRED; /* Level 6 */ 149 if( xvid_flags & CODEC_FLAG_GRAY ) 150 x->vop_flags |= XVID_VOP_GREYSCALE; 151 152 /* Decide which ME quality setting to use */ 153 x->me_flags = 0; 154 switch( avctx->me_method ) { 155 case ME_FULL: /* Quality 6 */ 156 x->me_flags |= XVID_ME_EXTSEARCH16 157 | XVID_ME_EXTSEARCH8; 158 159 case ME_EPZS: /* Quality 4 */ 160 x->me_flags |= XVID_ME_ADVANCEDDIAMOND8 161 | XVID_ME_HALFPELREFINE8 162 | XVID_ME_CHROMA_PVOP 163 | XVID_ME_CHROMA_BVOP; 164 165 case ME_LOG: /* Quality 2 */ 166 case ME_PHODS: 167 case ME_X1: 168 x->me_flags |= XVID_ME_ADVANCEDDIAMOND16 169 | XVID_ME_HALFPELREFINE16; 170 171 case ME_ZERO: /* Quality 0 */ 172 default: 173 break; 174 } 175 176 /* Decide how we should decide blocks */ 177 switch( avctx->mb_decision ) { 178 case 2: 179 x->vop_flags |= XVID_VOP_MODEDECISION_RD; 180 x->me_flags |= XVID_ME_HALFPELREFINE8_RD 181 | XVID_ME_QUARTERPELREFINE8_RD 182 | XVID_ME_EXTSEARCH_RD 183 | XVID_ME_CHECKPREDICTION_RD; 184 case 1: 185 if( !(x->vop_flags & XVID_VOP_MODEDECISION_RD) ) 186 x->vop_flags |= XVID_VOP_FAST_MODEDECISION_RD; 187 x->me_flags |= XVID_ME_HALFPELREFINE16_RD 188 | XVID_ME_QUARTERPELREFINE16_RD; 189 190 default: 191 break; 192 } 193 194 /* Bring in VOL flags from avconv command-line */ 195 x->vol_flags = 0; 196 if( xvid_flags & CODEC_FLAG_GMC ) { 197 x->vol_flags |= XVID_VOL_GMC; 198 x->me_flags |= XVID_ME_GME_REFINE; 199 } 200 if( xvid_flags & CODEC_FLAG_QPEL ) { 201 x->vol_flags |= XVID_VOL_QUARTERPEL; 202 x->me_flags |= XVID_ME_QUARTERPELREFINE16; 203 if( x->vop_flags & XVID_VOP_INTER4V ) 204 x->me_flags |= XVID_ME_QUARTERPELREFINE8; 205 } 206 207 memset(&xvid_gbl_init, 0, sizeof(xvid_gbl_init)); 208 xvid_gbl_init.version = XVID_VERSION; 209 xvid_gbl_init.debug = 0; 210 211#if ARCH_PPC 212 /* Xvid's PPC support is borked, use libavcodec to detect */ 213#if HAVE_ALTIVEC 214 if (av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC) { 215 xvid_gbl_init.cpu_flags = XVID_CPU_FORCE | XVID_CPU_ALTIVEC; 216 } else 217#endif 218 xvid_gbl_init.cpu_flags = XVID_CPU_FORCE; 219#else 220 /* Xvid can detect on x86 */ 221 xvid_gbl_init.cpu_flags = 0; 222#endif 223 224 /* Initialize */ 225 xvid_global(NULL, XVID_GBL_INIT, &xvid_gbl_init, NULL); 226 227 /* Create the encoder reference */ 228 memset(&xvid_enc_create, 0, sizeof(xvid_enc_create)); 229 xvid_enc_create.version = XVID_VERSION; 230 231 /* Store the desired frame size */ 232 xvid_enc_create.width = x->xsize = avctx->width; 233 xvid_enc_create.height = x->ysize = avctx->height; 234 235 /* Xvid can determine the proper profile to use */ 236 /* xvid_enc_create.profile = XVID_PROFILE_S_L3; */ 237 238 /* We don't use zones */ 239 xvid_enc_create.zones = NULL; 240 xvid_enc_create.num_zones = 0; 241 242 xvid_enc_create.num_threads = avctx->thread_count; 243 244 xvid_enc_create.plugins = plugins; 245 xvid_enc_create.num_plugins = 0; 246 247 /* Initialize Buffers */ 248 x->twopassbuffer = NULL; 249 x->old_twopassbuffer = NULL; 250 x->twopassfile = NULL; 251 252 if( xvid_flags & CODEC_FLAG_PASS1 ) { 253 memset(&rc2pass1, 0, sizeof(struct xvid_ff_pass1)); 254 rc2pass1.version = XVID_VERSION; 255 rc2pass1.context = x; 256 x->twopassbuffer = av_malloc(BUFFER_SIZE); 257 x->old_twopassbuffer = av_malloc(BUFFER_SIZE); 258 if( x->twopassbuffer == NULL || x->old_twopassbuffer == NULL ) { 259 av_log(avctx, AV_LOG_ERROR, 260 "Xvid: Cannot allocate 2-pass log buffers\n"); 261 return -1; 262 } 263 x->twopassbuffer[0] = x->old_twopassbuffer[0] = 0; 264 265 plugins[xvid_enc_create.num_plugins].func = xvid_ff_2pass; 266 plugins[xvid_enc_create.num_plugins].param = &rc2pass1; 267 xvid_enc_create.num_plugins++; 268 } else if( xvid_flags & CODEC_FLAG_PASS2 ) { 269 memset(&rc2pass2, 0, sizeof(xvid_plugin_2pass2_t)); 270 rc2pass2.version = XVID_VERSION; 271 rc2pass2.bitrate = avctx->bit_rate; 272 273 fd = ff_tempfile("xvidff.", &x->twopassfile); 274 if( fd == -1 ) { 275 av_log(avctx, AV_LOG_ERROR, 276 "Xvid: Cannot write 2-pass pipe\n"); 277 return -1; 278 } 279 280 if( avctx->stats_in == NULL ) { 281 av_log(avctx, AV_LOG_ERROR, 282 "Xvid: No 2-pass information loaded for second pass\n"); 283 return -1; 284 } 285 286 if( strlen(avctx->stats_in) > 287 write(fd, avctx->stats_in, strlen(avctx->stats_in)) ) { 288 close(fd); 289 av_log(avctx, AV_LOG_ERROR, 290 "Xvid: Cannot write to 2-pass pipe\n"); 291 return -1; 292 } 293 294 close(fd); 295 rc2pass2.filename = x->twopassfile; 296 plugins[xvid_enc_create.num_plugins].func = xvid_plugin_2pass2; 297 plugins[xvid_enc_create.num_plugins].param = &rc2pass2; 298 xvid_enc_create.num_plugins++; 299 } else if( !(xvid_flags & CODEC_FLAG_QSCALE) ) { 300 /* Single Pass Bitrate Control! */ 301 memset(&single, 0, sizeof(xvid_plugin_single_t)); 302 single.version = XVID_VERSION; 303 single.bitrate = avctx->bit_rate; 304 305 plugins[xvid_enc_create.num_plugins].func = xvid_plugin_single; 306 plugins[xvid_enc_create.num_plugins].param = &single; 307 xvid_enc_create.num_plugins++; 308 } 309 310 /* Luminance Masking */ 311 if( 0.0 != avctx->lumi_masking ) { 312 plugins[xvid_enc_create.num_plugins].func = xvid_plugin_lumimasking; 313 plugins[xvid_enc_create.num_plugins].param = NULL; 314 xvid_enc_create.num_plugins++; 315 } 316 317 /* Frame Rate and Key Frames */ 318 xvid_correct_framerate(avctx); 319 xvid_enc_create.fincr = avctx->time_base.num; 320 xvid_enc_create.fbase = avctx->time_base.den; 321 if( avctx->gop_size > 0 ) 322 xvid_enc_create.max_key_interval = avctx->gop_size; 323 else 324 xvid_enc_create.max_key_interval = 240; /* Xvid's best default */ 325 326 /* Quants */ 327 if( xvid_flags & CODEC_FLAG_QSCALE ) x->qscale = 1; 328 else x->qscale = 0; 329 330 xvid_enc_create.min_quant[0] = avctx->qmin; 331 xvid_enc_create.min_quant[1] = avctx->qmin; 332 xvid_enc_create.min_quant[2] = avctx->qmin; 333 xvid_enc_create.max_quant[0] = avctx->qmax; 334 xvid_enc_create.max_quant[1] = avctx->qmax; 335 xvid_enc_create.max_quant[2] = avctx->qmax; 336 337 /* Quant Matrices */ 338 x->intra_matrix = x->inter_matrix = NULL; 339 if( avctx->mpeg_quant ) 340 x->vol_flags |= XVID_VOL_MPEGQUANT; 341 if( (avctx->intra_matrix || avctx->inter_matrix) ) { 342 x->vol_flags |= XVID_VOL_MPEGQUANT; 343 344 if( avctx->intra_matrix ) { 345 intra = avctx->intra_matrix; 346 x->intra_matrix = av_malloc(sizeof(unsigned char) * 64); 347 } else 348 intra = NULL; 349 if( avctx->inter_matrix ) { 350 inter = avctx->inter_matrix; 351 x->inter_matrix = av_malloc(sizeof(unsigned char) * 64); 352 } else 353 inter = NULL; 354 355 for( i = 0; i < 64; i++ ) { 356 if( intra ) 357 x->intra_matrix[i] = (unsigned char)intra[i]; 358 if( inter ) 359 x->inter_matrix[i] = (unsigned char)inter[i]; 360 } 361 } 362 363 /* Misc Settings */ 364 xvid_enc_create.frame_drop_ratio = 0; 365 xvid_enc_create.global = 0; 366 if( xvid_flags & CODEC_FLAG_CLOSED_GOP ) 367 xvid_enc_create.global |= XVID_GLOBAL_CLOSED_GOP; 368 369 /* Determines which codec mode we are operating in */ 370 avctx->extradata = NULL; 371 avctx->extradata_size = 0; 372 if( xvid_flags & CODEC_FLAG_GLOBAL_HEADER ) { 373 /* In this case, we are claiming to be MPEG4 */ 374 x->quicktime_format = 1; 375 avctx->codec_id = CODEC_ID_MPEG4; 376 } else { 377 /* We are claiming to be Xvid */ 378 x->quicktime_format = 0; 379 if(!avctx->codec_tag) 380 avctx->codec_tag = AV_RL32("xvid"); 381 } 382 383 /* Bframes */ 384 xvid_enc_create.max_bframes = avctx->max_b_frames; 385 xvid_enc_create.bquant_offset = 100 * avctx->b_quant_offset; 386 xvid_enc_create.bquant_ratio = 100 * avctx->b_quant_factor; 387 if( avctx->max_b_frames > 0 && !x->quicktime_format ) xvid_enc_create.global |= XVID_GLOBAL_PACKED; 388 389 /* Create encoder context */ 390 xerr = xvid_encore(NULL, XVID_ENC_CREATE, &xvid_enc_create, NULL); 391 if( xerr ) { 392 av_log(avctx, AV_LOG_ERROR, "Xvid: Could not create encoder reference\n"); 393 return -1; 394 } 395 396 x->encoder_handle = xvid_enc_create.handle; 397 avctx->coded_frame = &x->encoded_picture; 398 399 return 0; 400} 401 402/** 403 * Encode a single frame. 404 * 405 * @param avctx AVCodecContext pointer to context 406 * @param frame Pointer to encoded frame buffer 407 * @param buf_size Size of encoded frame buffer 408 * @param data Pointer to AVFrame of unencoded frame 409 * @return Returns 0 on success, -1 on failure 410 */ 411static int xvid_encode_frame(AVCodecContext *avctx, 412 unsigned char *frame, int buf_size, void *data) { 413 int xerr, i; 414 char *tmp; 415 struct xvid_context *x = avctx->priv_data; 416 AVFrame *picture = data; 417 AVFrame *p = &x->encoded_picture; 418 419 xvid_enc_frame_t xvid_enc_frame; 420 xvid_enc_stats_t xvid_enc_stats; 421 422 /* Start setting up the frame */ 423 memset(&xvid_enc_frame, 0, sizeof(xvid_enc_frame)); 424 xvid_enc_frame.version = XVID_VERSION; 425 memset(&xvid_enc_stats, 0, sizeof(xvid_enc_stats)); 426 xvid_enc_stats.version = XVID_VERSION; 427 *p = *picture; 428 429 /* Let Xvid know where to put the frame. */ 430 xvid_enc_frame.bitstream = frame; 431 xvid_enc_frame.length = buf_size; 432 433 /* Initialize input image fields */ 434 if( avctx->pix_fmt != PIX_FMT_YUV420P ) { 435 av_log(avctx, AV_LOG_ERROR, "Xvid: Color spaces other than 420p not supported\n"); 436 return -1; 437 } 438 439 xvid_enc_frame.input.csp = XVID_CSP_PLANAR; /* YUV420P */ 440 441 for( i = 0; i < 4; i++ ) { 442 xvid_enc_frame.input.plane[i] = picture->data[i]; 443 xvid_enc_frame.input.stride[i] = picture->linesize[i]; 444 } 445 446 /* Encoder Flags */ 447 xvid_enc_frame.vop_flags = x->vop_flags; 448 xvid_enc_frame.vol_flags = x->vol_flags; 449 xvid_enc_frame.motion = x->me_flags; 450 xvid_enc_frame.type = 451 picture->pict_type == AV_PICTURE_TYPE_I ? XVID_TYPE_IVOP : 452 picture->pict_type == AV_PICTURE_TYPE_P ? XVID_TYPE_PVOP : 453 picture->pict_type == AV_PICTURE_TYPE_B ? XVID_TYPE_BVOP : 454 XVID_TYPE_AUTO; 455 456 /* Pixel aspect ratio setting */ 457 if (avctx->sample_aspect_ratio.num < 1 || avctx->sample_aspect_ratio.num > 255 || 458 avctx->sample_aspect_ratio.den < 1 || avctx->sample_aspect_ratio.den > 255) { 459 av_log(avctx, AV_LOG_ERROR, "Invalid pixel aspect ratio %i/%i\n", 460 avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den); 461 return -1; 462 } 463 xvid_enc_frame.par = XVID_PAR_EXT; 464 xvid_enc_frame.par_width = avctx->sample_aspect_ratio.num; 465 xvid_enc_frame.par_height = avctx->sample_aspect_ratio.den; 466 467 /* Quant Setting */ 468 if( x->qscale ) xvid_enc_frame.quant = picture->quality / FF_QP2LAMBDA; 469 else xvid_enc_frame.quant = 0; 470 471 /* Matrices */ 472 xvid_enc_frame.quant_intra_matrix = x->intra_matrix; 473 xvid_enc_frame.quant_inter_matrix = x->inter_matrix; 474 475 /* Encode */ 476 xerr = xvid_encore(x->encoder_handle, XVID_ENC_ENCODE, 477 &xvid_enc_frame, &xvid_enc_stats); 478 479 /* Two-pass log buffer swapping */ 480 avctx->stats_out = NULL; 481 if( x->twopassbuffer ) { 482 tmp = x->old_twopassbuffer; 483 x->old_twopassbuffer = x->twopassbuffer; 484 x->twopassbuffer = tmp; 485 x->twopassbuffer[0] = 0; 486 if( x->old_twopassbuffer[0] != 0 ) { 487 avctx->stats_out = x->old_twopassbuffer; 488 } 489 } 490 491 if( 0 <= xerr ) { 492 p->quality = xvid_enc_stats.quant * FF_QP2LAMBDA; 493 if( xvid_enc_stats.type == XVID_TYPE_PVOP ) 494 p->pict_type = AV_PICTURE_TYPE_P; 495 else if( xvid_enc_stats.type == XVID_TYPE_BVOP ) 496 p->pict_type = AV_PICTURE_TYPE_B; 497 else if( xvid_enc_stats.type == XVID_TYPE_SVOP ) 498 p->pict_type = AV_PICTURE_TYPE_S; 499 else 500 p->pict_type = AV_PICTURE_TYPE_I; 501 if( xvid_enc_frame.out_flags & XVID_KEYFRAME ) { 502 p->key_frame = 1; 503 if( x->quicktime_format ) 504 return xvid_strip_vol_header(avctx, frame, 505 xvid_enc_stats.hlength, xerr); 506 } else 507 p->key_frame = 0; 508 509 return xerr; 510 } else { 511 av_log(avctx, AV_LOG_ERROR, "Xvid: Encoding Error Occurred: %i\n", xerr); 512 return -1; 513 } 514} 515 516/** 517 * Destroy the private context for the encoder. 518 * All buffers are freed, and the Xvid encoder context is destroyed. 519 * 520 * @param avctx AVCodecContext pointer to context 521 * @return Returns 0, success guaranteed 522 */ 523static av_cold int xvid_encode_close(AVCodecContext *avctx) { 524 struct xvid_context *x = avctx->priv_data; 525 526 xvid_encore(x->encoder_handle, XVID_ENC_DESTROY, NULL, NULL); 527 528 av_freep(&avctx->extradata); 529 if( x->twopassbuffer != NULL ) { 530 av_free(x->twopassbuffer); 531 av_free(x->old_twopassbuffer); 532 } 533 av_free(x->twopassfile); 534 av_free(x->intra_matrix); 535 av_free(x->inter_matrix); 536 537 return 0; 538} 539 540/** 541 * Routine to create a global VO/VOL header for MP4 container. 542 * What we do here is extract the header from the Xvid bitstream 543 * as it is encoded. We also strip the repeated headers from the 544 * bitstream when a global header is requested for MPEG-4 ISO 545 * compliance. 546 * 547 * @param avctx AVCodecContext pointer to context 548 * @param frame Pointer to encoded frame data 549 * @param header_len Length of header to search 550 * @param frame_len Length of encoded frame data 551 * @return Returns new length of frame data 552 */ 553int xvid_strip_vol_header(AVCodecContext *avctx, 554 unsigned char *frame, 555 unsigned int header_len, 556 unsigned int frame_len) { 557 int vo_len = 0, i; 558 559 for( i = 0; i < header_len - 3; i++ ) { 560 if( frame[i] == 0x00 && 561 frame[i+1] == 0x00 && 562 frame[i+2] == 0x01 && 563 frame[i+3] == 0xB6 ) { 564 vo_len = i; 565 break; 566 } 567 } 568 569 if( vo_len > 0 ) { 570 /* We need to store the header, so extract it */ 571 if( avctx->extradata == NULL ) { 572 avctx->extradata = av_malloc(vo_len); 573 memcpy(avctx->extradata, frame, vo_len); 574 avctx->extradata_size = vo_len; 575 } 576 /* Less dangerous now, memmove properly copies the two 577 chunks of overlapping data */ 578 memmove(frame, &frame[vo_len], frame_len - vo_len); 579 return frame_len - vo_len; 580 } else 581 return frame_len; 582} 583 584/** 585 * Routine to correct a possibly erroneous framerate being fed to us. 586 * Xvid currently chokes on framerates where the ticks per frame is 587 * extremely large. This function works to correct problems in this area 588 * by estimating a new framerate and taking the simpler fraction of 589 * the two presented. 590 * 591 * @param avctx Context that contains the framerate to correct. 592 */ 593void xvid_correct_framerate(AVCodecContext *avctx) { 594 int frate, fbase; 595 int est_frate, est_fbase; 596 int gcd; 597 float est_fps, fps; 598 599 frate = avctx->time_base.den; 600 fbase = avctx->time_base.num; 601 602 gcd = av_gcd(frate, fbase); 603 if( gcd > 1 ) { 604 frate /= gcd; 605 fbase /= gcd; 606 } 607 608 if( frate <= 65000 && fbase <= 65000 ) { 609 avctx->time_base.den = frate; 610 avctx->time_base.num = fbase; 611 return; 612 } 613 614 fps = (float)frate / (float)fbase; 615 est_fps = roundf(fps * 1000.0) / 1000.0; 616 617 est_frate = (int)est_fps; 618 if( est_fps > (int)est_fps ) { 619 est_frate = (est_frate + 1) * 1000; 620 est_fbase = (int)roundf((float)est_frate / est_fps); 621 } else 622 est_fbase = 1; 623 624 gcd = av_gcd(est_frate, est_fbase); 625 if( gcd > 1 ) { 626 est_frate /= gcd; 627 est_fbase /= gcd; 628 } 629 630 if( fbase > est_fbase ) { 631 avctx->time_base.den = est_frate; 632 avctx->time_base.num = est_fbase; 633 av_log(avctx, AV_LOG_DEBUG, 634 "Xvid: framerate re-estimated: %.2f, %.3f%% correction\n", 635 est_fps, (((est_fps - fps)/fps) * 100.0)); 636 } else { 637 avctx->time_base.den = frate; 638 avctx->time_base.num = fbase; 639 } 640} 641 642/* 643 * Xvid 2-Pass Kludge Section 644 * 645 * Xvid's default 2-pass doesn't allow us to create data as we need to, so 646 * this section spends time replacing the first pass plugin so we can write 647 * statistic information as libavcodec requests in. We have another kludge 648 * that allows us to pass data to the second pass in Xvid without a custom 649 * rate-control plugin. 650 */ 651 652/** 653 * Initialize the two-pass plugin and context. 654 * 655 * @param param Input construction parameter structure 656 * @param handle Private context handle 657 * @return Returns XVID_ERR_xxxx on failure, or 0 on success. 658 */ 659static int xvid_ff_2pass_create(xvid_plg_create_t * param, 660 void ** handle) { 661 struct xvid_ff_pass1 *x = (struct xvid_ff_pass1 *)param->param; 662 char *log = x->context->twopassbuffer; 663 664 /* Do a quick bounds check */ 665 if( log == NULL ) 666 return XVID_ERR_FAIL; 667 668 /* We use snprintf() */ 669 /* This is because we can safely prevent a buffer overflow */ 670 log[0] = 0; 671 snprintf(log, BUFFER_REMAINING(log), 672 "# avconv 2-pass log file, using xvid codec\n"); 673 snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log), 674 "# Do not modify. libxvidcore version: %d.%d.%d\n\n", 675 XVID_VERSION_MAJOR(XVID_VERSION), 676 XVID_VERSION_MINOR(XVID_VERSION), 677 XVID_VERSION_PATCH(XVID_VERSION)); 678 679 *handle = x->context; 680 return 0; 681} 682 683/** 684 * Destroy the two-pass plugin context. 685 * 686 * @param ref Context pointer for the plugin 687 * @param param Destrooy context 688 * @return Returns 0, success guaranteed 689 */ 690static int xvid_ff_2pass_destroy(struct xvid_context *ref, 691 xvid_plg_destroy_t *param) { 692 /* Currently cannot think of anything to do on destruction */ 693 /* Still, the framework should be here for reference/use */ 694 if( ref->twopassbuffer != NULL ) 695 ref->twopassbuffer[0] = 0; 696 return 0; 697} 698 699/** 700 * Enable fast encode mode during the first pass. 701 * 702 * @param ref Context pointer for the plugin 703 * @param param Frame data 704 * @return Returns 0, success guaranteed 705 */ 706static int xvid_ff_2pass_before(struct xvid_context *ref, 707 xvid_plg_data_t *param) { 708 int motion_remove; 709 int motion_replacements; 710 int vop_remove; 711 712 /* Nothing to do here, result is changed too much */ 713 if( param->zone && param->zone->mode == XVID_ZONE_QUANT ) 714 return 0; 715 716 /* We can implement a 'turbo' first pass mode here */ 717 param->quant = 2; 718 719 /* Init values */ 720 motion_remove = ~XVID_ME_CHROMA_PVOP & 721 ~XVID_ME_CHROMA_BVOP & 722 ~XVID_ME_EXTSEARCH16 & 723 ~XVID_ME_ADVANCEDDIAMOND16; 724 motion_replacements = XVID_ME_FAST_MODEINTERPOLATE | 725 XVID_ME_SKIP_DELTASEARCH | 726 XVID_ME_FASTREFINE16 | 727 XVID_ME_BFRAME_EARLYSTOP; 728 vop_remove = ~XVID_VOP_MODEDECISION_RD & 729 ~XVID_VOP_FAST_MODEDECISION_RD & 730 ~XVID_VOP_TRELLISQUANT & 731 ~XVID_VOP_INTER4V & 732 ~XVID_VOP_HQACPRED; 733 734 param->vol_flags &= ~XVID_VOL_GMC; 735 param->vop_flags &= vop_remove; 736 param->motion_flags &= motion_remove; 737 param->motion_flags |= motion_replacements; 738 739 return 0; 740} 741 742/** 743 * Capture statistic data and write it during first pass. 744 * 745 * @param ref Context pointer for the plugin 746 * @param param Statistic data 747 * @return Returns XVID_ERR_xxxx on failure, or 0 on success 748 */ 749static int xvid_ff_2pass_after(struct xvid_context *ref, 750 xvid_plg_data_t *param) { 751 char *log = ref->twopassbuffer; 752 const char *frame_types = " ipbs"; 753 char frame_type; 754 755 /* Quick bounds check */ 756 if( log == NULL ) 757 return XVID_ERR_FAIL; 758 759 /* Convert the type given to us into a character */ 760 if( param->type < 5 && param->type > 0 ) { 761 frame_type = frame_types[param->type]; 762 } else { 763 return XVID_ERR_FAIL; 764 } 765 766 snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log), 767 "%c %d %d %d %d %d %d\n", 768 frame_type, param->stats.quant, param->stats.kblks, param->stats.mblks, 769 param->stats.ublks, param->stats.length, param->stats.hlength); 770 771 return 0; 772} 773 774/** 775 * Dispatch function for our custom plugin. 776 * This handles the dispatch for the Xvid plugin. It passes data 777 * on to other functions for actual processing. 778 * 779 * @param ref Context pointer for the plugin 780 * @param cmd The task given for us to complete 781 * @param p1 First parameter (varies) 782 * @param p2 Second parameter (varies) 783 * @return Returns XVID_ERR_xxxx on failure, or 0 on success 784 */ 785int xvid_ff_2pass(void *ref, int cmd, void *p1, void *p2) { 786 switch( cmd ) { 787 case XVID_PLG_INFO: 788 case XVID_PLG_FRAME: 789 return 0; 790 791 case XVID_PLG_BEFORE: 792 return xvid_ff_2pass_before(ref, p1); 793 794 case XVID_PLG_CREATE: 795 return xvid_ff_2pass_create(p1, p2); 796 797 case XVID_PLG_AFTER: 798 return xvid_ff_2pass_after(ref, p1); 799 800 case XVID_PLG_DESTROY: 801 return xvid_ff_2pass_destroy(ref, p1); 802 803 default: 804 return XVID_ERR_FAIL; 805 } 806} 807 808/** 809 * Xvid codec definition for libavcodec. 810 */ 811AVCodec ff_libxvid_encoder = { 812 .name = "libxvid", 813 .type = AVMEDIA_TYPE_VIDEO, 814 .id = CODEC_ID_MPEG4, 815 .priv_data_size = sizeof(struct xvid_context), 816 .init = xvid_encode_init, 817 .encode = xvid_encode_frame, 818 .close = xvid_encode_close, 819 .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE}, 820 .long_name= NULL_IF_CONFIG_SMALL("libxvidcore MPEG-4 part 2"), 821}; 822 823#endif /* CONFIG_LIBXVID_ENCODER */ 824