libavcodec/libxvid.c

   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.h"
  35 #include "mpegvideo.h"
  36
  37 /**
  38  * Buffer management macros.
  39  */
  40 #define BUFFER_SIZE                 1024
  41 #define BUFFER_REMAINING(x)         (BUFFER_SIZE - strlen(x))
  42 #define BUFFER_CAT(x)               (&((x)[strlen(x)]))
  43
  44 /**
  45  * Structure for the private Xvid context.
  46  * This stores all the private context for the codec.
  47  */
  48 struct xvid_context {
  49     void *encoder_handle;          /**< Handle for Xvid encoder */
  50     int xsize;                     /**< Frame x size */
  51     int ysize;                     /**< Frame y size */
  52     int vop_flags;                 /**< VOP flags for Xvid encoder */
  53     int vol_flags;                 /**< VOL flags for Xvid encoder */
  54     int me_flags;                  /**< Motion Estimation flags */
  55     int qscale;                    /**< Do we use constant scale? */
  56     int quicktime_format;          /**< Are we in a QT-based format? */
  57     AVFrame encoded_picture;       /**< Encoded frame information */
  58     char *twopassbuffer;           /**< Character buffer for two-pass */
  59     char *old_twopassbuffer;       /**< Old character buffer (two-pass) */
  60     char *twopassfile;             /**< second pass temp file name */
  61     unsigned char *intra_matrix;   /**< P-Frame Quant Matrix */
  62     unsigned char *inter_matrix;   /**< I-Frame Quant Matrix */
  63 };
  64
  65 /**
  66  * Structure for the private first-pass plugin.
  67  */
  68 struct xvid_ff_pass1 {
  69     int     version;                /**< Xvid version */
  70     struct xvid_context *context;   /**< Pointer to private context */
  71 };
  72
  73 /*
  74  * Xvid 2-Pass Kludge Section
  75  *
  76  * Xvid's default 2-pass doesn't allow us to create data as we need to, so
  77  * this section spends time replacing the first pass plugin so we can write
  78  * statistic information as libavcodec requests in. We have another kludge
  79  * that allows us to pass data to the second pass in Xvid without a custom
  80  * rate-control plugin.
  81  */
  82
  83 /**
  84  * Initialize the two-pass plugin and context.
  85  *
  86  * @param param Input construction parameter structure
  87  * @param handle Private context handle
  88  * @return Returns XVID_ERR_xxxx on failure, or 0 on success.
  89  */
  90 static int xvid_ff_2pass_create(xvid_plg_create_t * param,
  91                                 void ** handle) {
  92     struct xvid_ff_pass1 *x = (struct xvid_ff_pass1 *)param->param;
  93     char *log = x->context->twopassbuffer;
  94
  95     /* Do a quick bounds check */
  96     if( log == NULL )
  97         return XVID_ERR_FAIL;
  98
  99     /* We use snprintf() */
 100     /* This is because we can safely prevent a buffer overflow */
 101     log[0] = 0;
 102     snprintf(log, BUFFER_REMAINING(log),
 103         "# avconv 2-pass log file, using xvid codec\n");
 104     snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),
 105         "# Do not modify. libxvidcore version: %d.%d.%d\n\n",
 106         XVID_VERSION_MAJOR(XVID_VERSION),
 107         XVID_VERSION_MINOR(XVID_VERSION),
 108         XVID_VERSION_PATCH(XVID_VERSION));
 109
 110     *handle = x->context;
 111     return 0;
 112 }
 113
 114 /**
 115  * Destroy the two-pass plugin context.
 116  *
 117  * @param ref Context pointer for the plugin
 118  * @param param Destrooy context
 119  * @return Returns 0, success guaranteed
 120  */
 121 static int xvid_ff_2pass_destroy(struct xvid_context *ref,
 122                                 xvid_plg_destroy_t *param) {
 123     /* Currently cannot think of anything to do on destruction */
 124     /* Still, the framework should be here for reference/use */
 125     if( ref->twopassbuffer != NULL )
 126         ref->twopassbuffer[0] = 0;
 127     return 0;
 128 }
 129
 130 /**
 131  * Enable fast encode mode during the first pass.
 132  *
 133  * @param ref Context pointer for the plugin
 134  * @param param Frame data
 135  * @return Returns 0, success guaranteed
 136  */
 137 static int xvid_ff_2pass_before(struct xvid_context *ref,
 138                                 xvid_plg_data_t *param) {
 139     int motion_remove;
 140     int motion_replacements;
 141     int vop_remove;
 142
 143     /* Nothing to do here, result is changed too much */
 144     if( param->zone && param->zone->mode == XVID_ZONE_QUANT )
 145         return 0;
 146
 147     /* We can implement a 'turbo' first pass mode here */
 148     param->quant = 2;
 149
 150     /* Init values */
 151     motion_remove = ~XVID_ME_CHROMA_PVOP &
 152                     ~XVID_ME_CHROMA_BVOP &
 153                     ~XVID_ME_EXTSEARCH16 &
 154                     ~XVID_ME_ADVANCEDDIAMOND16;
 155     motion_replacements = XVID_ME_FAST_MODEINTERPOLATE |
 156                           XVID_ME_SKIP_DELTASEARCH |
 157                           XVID_ME_FASTREFINE16 |
 158                           XVID_ME_BFRAME_EARLYSTOP;
 159     vop_remove = ~XVID_VOP_MODEDECISION_RD &
 160                  ~XVID_VOP_FAST_MODEDECISION_RD &
 161                  ~XVID_VOP_TRELLISQUANT &
 162                  ~XVID_VOP_INTER4V &
 163                  ~XVID_VOP_HQACPRED;
 164
 165     param->vol_flags &= ~XVID_VOL_GMC;
 166     param->vop_flags &= vop_remove;
 167     param->motion_flags &= motion_remove;
 168     param->motion_flags |= motion_replacements;
 169
 170     return 0;
 171 }
 172
 173 /**
 174  * Capture statistic data and write it during first pass.
 175  *
 176  * @param ref Context pointer for the plugin
 177  * @param param Statistic data
 178  * @return Returns XVID_ERR_xxxx on failure, or 0 on success
 179  */
 180 static int xvid_ff_2pass_after(struct xvid_context *ref,
 181                                 xvid_plg_data_t *param) {
 182     char *log = ref->twopassbuffer;
 183     const char *frame_types = " ipbs";
 184     char frame_type;
 185
 186     /* Quick bounds check */
 187     if( log == NULL )
 188         return XVID_ERR_FAIL;
 189
 190     /* Convert the type given to us into a character */
 191     if( param->type < 5 && param->type > 0 ) {
 192         frame_type = frame_types[param->type];
 193     } else {
 194         return XVID_ERR_FAIL;
 195     }
 196
 197     snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),
 198         "%c %d %d %d %d %d %d\n",
 199         frame_type, param->stats.quant, param->stats.kblks, param->stats.mblks,
 200         param->stats.ublks, param->stats.length, param->stats.hlength);
 201
 202     return 0;
 203 }
 204
 205 /**
 206  * Dispatch function for our custom plugin.
 207  * This handles the dispatch for the Xvid plugin. It passes data
 208  * on to other functions for actual processing.
 209  *
 210  * @param ref Context pointer for the plugin
 211  * @param cmd The task given for us to complete
 212  * @param p1 First parameter (varies)
 213  * @param p2 Second parameter (varies)
 214  * @return Returns XVID_ERR_xxxx on failure, or 0 on success
 215  */
 216 static int xvid_ff_2pass(void *ref, int cmd, void *p1, void *p2)
 217 {
 218     switch( cmd ) {
 219         case XVID_PLG_INFO:
 220         case XVID_PLG_FRAME:
 221             return 0;
 222
 223         case XVID_PLG_BEFORE:
 224             return xvid_ff_2pass_before(ref, p1);
 225
 226         case XVID_PLG_CREATE:
 227             return xvid_ff_2pass_create(p1, p2);
 228
 229         case XVID_PLG_AFTER:
 230             return xvid_ff_2pass_after(ref, p1);
 231
 232         case XVID_PLG_DESTROY:
 233             return xvid_ff_2pass_destroy(ref, p1);
 234
 235         default:
 236             return XVID_ERR_FAIL;
 237     }
 238 }
 239
 240 /**
 241  * Routine to create a global VO/VOL header for MP4 container.
 242  * What we do here is extract the header from the Xvid bitstream
 243  * as it is encoded. We also strip the repeated headers from the
 244  * bitstream when a global header is requested for MPEG-4 ISO
 245  * compliance.
 246  *
 247  * @param avctx AVCodecContext pointer to context
 248  * @param frame Pointer to encoded frame data
 249  * @param header_len Length of header to search
 250  * @param frame_len Length of encoded frame data
 251  * @return Returns new length of frame data
 252  */
 253 static int xvid_strip_vol_header(AVCodecContext *avctx,
 254                   AVPacket *pkt,
 255                   unsigned int header_len,
 256                   unsigned int frame_len) {
 257     int vo_len = 0, i;
 258
 259     for( i = 0; i < header_len - 3; i++ ) {
 260         if( pkt->data[i] == 0x00 &&
 261             pkt->data[i+1] == 0x00 &&
 262             pkt->data[i+2] == 0x01 &&
 263             pkt->data[i+3] == 0xB6 ) {
 264             vo_len = i;
 265             break;
 266         }
 267     }
 268
 269     if( vo_len > 0 ) {
 270         /* We need to store the header, so extract it */
 271         if( avctx->extradata == NULL ) {
 272             avctx->extradata = av_malloc(vo_len);
 273             memcpy(avctx->extradata, pkt->data, vo_len);
 274             avctx->extradata_size = vo_len;
 275         }
 276         /* Less dangerous now, memmove properly copies the two
 277            chunks of overlapping data */
 278         memmove(pkt->data, &pkt->data[vo_len], frame_len - vo_len);
 279         pkt->size = frame_len - vo_len;
 280     }
 281     return 0;
 282 }
 283
 284 /**
 285  * Routine to correct a possibly erroneous framerate being fed to us.
 286  * Xvid currently chokes on framerates where the ticks per frame is
 287  * extremely large. This function works to correct problems in this area
 288  * by estimating a new framerate and taking the simpler fraction of
 289  * the two presented.
 290  *
 291  * @param avctx Context that contains the framerate to correct.
 292  */
 293 static void xvid_correct_framerate(AVCodecContext *avctx)
 294 {
 295     int frate, fbase;
 296     int est_frate, est_fbase;
 297     int gcd;
 298     float est_fps, fps;
 299
 300     frate = avctx->time_base.den;
 301     fbase = avctx->time_base.num;
 302
 303     gcd = av_gcd(frate, fbase);
 304     if( gcd > 1 ) {
 305         frate /= gcd;
 306         fbase /= gcd;
 307     }
 308
 309     if( frate <= 65000 && fbase <= 65000 ) {
 310         avctx->time_base.den = frate;
 311         avctx->time_base.num = fbase;
 312         return;
 313     }
 314
 315     fps = (float)frate / (float)fbase;
 316     est_fps = roundf(fps * 1000.0) / 1000.0;
 317
 318     est_frate = (int)est_fps;
 319     if( est_fps > (int)est_fps ) {
 320         est_frate = (est_frate + 1) * 1000;
 321         est_fbase = (int)roundf((float)est_frate / est_fps);
 322     } else
 323         est_fbase = 1;
 324
 325     gcd = av_gcd(est_frate, est_fbase);
 326     if( gcd > 1 ) {
 327         est_frate /= gcd;
 328         est_fbase /= gcd;
 329     }
 330
 331     if( fbase > est_fbase ) {
 332         avctx->time_base.den = est_frate;
 333         avctx->time_base.num = est_fbase;
 334         av_log(avctx, AV_LOG_DEBUG,
 335             "Xvid: framerate re-estimated: %.2f, %.3f%% correction\n",
 336             est_fps, (((est_fps - fps)/fps) * 100.0));
 337     } else {
 338         avctx->time_base.den = frate;
 339         avctx->time_base.num = fbase;
 340     }
 341 }
 342
 343 static av_cold int xvid_encode_init(AVCodecContext *avctx)  {
 344     int xerr, i;
 345     int xvid_flags = avctx->flags;
 346     struct xvid_context *x = avctx->priv_data;
 347     uint16_t *intra, *inter;
 348     int fd;
 349
 350     xvid_plugin_single_t single       = { 0 };
 351     struct xvid_ff_pass1 rc2pass1     = { 0 };
 352     xvid_plugin_2pass2_t rc2pass2     = { 0 };
 353     xvid_gbl_init_t xvid_gbl_init     = { 0 };
 354     xvid_enc_create_t xvid_enc_create = { 0 };
 355     xvid_enc_plugin_t plugins[7];
 356
 357     /* Bring in VOP flags from avconv command-line */
 358     x->vop_flags = XVID_VOP_HALFPEL; /* Bare minimum quality */
 359     if( xvid_flags & CODEC_FLAG_4MV )
 360         x->vop_flags |= XVID_VOP_INTER4V; /* Level 3 */
 361     if( avctx->trellis
 362         )
 363         x->vop_flags |= XVID_VOP_TRELLISQUANT; /* Level 5 */
 364     if( xvid_flags & CODEC_FLAG_AC_PRED )
 365         x->vop_flags |= XVID_VOP_HQACPRED; /* Level 6 */
 366     if( xvid_flags & CODEC_FLAG_GRAY )
 367         x->vop_flags |= XVID_VOP_GREYSCALE;
 368
 369     /* Decide which ME quality setting to use */
 370     x->me_flags = 0;
 371     switch( avctx->me_method ) {
 372        case ME_FULL:   /* Quality 6 */
 373            x->me_flags |=  XVID_ME_EXTSEARCH16
 374                        |   XVID_ME_EXTSEARCH8;
 375
 376        case ME_EPZS:   /* Quality 4 */
 377            x->me_flags |=  XVID_ME_ADVANCEDDIAMOND8
 378                        |   XVID_ME_HALFPELREFINE8
 379                        |   XVID_ME_CHROMA_PVOP
 380                        |   XVID_ME_CHROMA_BVOP;
 381
 382        case ME_LOG:    /* Quality 2 */
 383        case ME_PHODS:
 384        case ME_X1:
 385            x->me_flags |=  XVID_ME_ADVANCEDDIAMOND16
 386                        |   XVID_ME_HALFPELREFINE16;
 387
 388        case ME_ZERO:   /* Quality 0 */
 389        default:
 390            break;
 391     }
 392
 393     /* Decide how we should decide blocks */
 394     switch( avctx->mb_decision ) {
 395        case 2:
 396            x->vop_flags |= XVID_VOP_MODEDECISION_RD;
 397            x->me_flags |=  XVID_ME_HALFPELREFINE8_RD
 398                        |   XVID_ME_QUARTERPELREFINE8_RD
 399                        |   XVID_ME_EXTSEARCH_RD
 400                        |   XVID_ME_CHECKPREDICTION_RD;
 401        case 1:
 402            if( !(x->vop_flags & XVID_VOP_MODEDECISION_RD) )
 403                x->vop_flags |= XVID_VOP_FAST_MODEDECISION_RD;
 404            x->me_flags |=  XVID_ME_HALFPELREFINE16_RD
 405                        |   XVID_ME_QUARTERPELREFINE16_RD;
 406
 407        default:
 408            break;
 409     }
 410
 411     /* Bring in VOL flags from avconv command-line */
 412     x->vol_flags = 0;
 413     if( xvid_flags & CODEC_FLAG_GMC ) {
 414         x->vol_flags |= XVID_VOL_GMC;
 415         x->me_flags |= XVID_ME_GME_REFINE;
 416     }
 417     if( xvid_flags & CODEC_FLAG_QPEL ) {
 418         x->vol_flags |= XVID_VOL_QUARTERPEL;
 419         x->me_flags |= XVID_ME_QUARTERPELREFINE16;
 420         if( x->vop_flags & XVID_VOP_INTER4V )
 421             x->me_flags |= XVID_ME_QUARTERPELREFINE8;
 422     }
 423
 424     xvid_gbl_init.version = XVID_VERSION;
 425     xvid_gbl_init.debug = 0;
 426
 427 #if ARCH_PPC
 428     /* Xvid's PPC support is borked, use libavcodec to detect */
 429 #if HAVE_ALTIVEC
 430     if (av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC) {
 431         xvid_gbl_init.cpu_flags = XVID_CPU_FORCE | XVID_CPU_ALTIVEC;
 432     } else
 433 #endif
 434         xvid_gbl_init.cpu_flags = XVID_CPU_FORCE;
 435 #else
 436     /* Xvid can detect on x86 */
 437     xvid_gbl_init.cpu_flags = 0;
 438 #endif
 439
 440     /* Initialize */
 441     xvid_global(NULL, XVID_GBL_INIT, &xvid_gbl_init, NULL);
 442
 443     /* Create the encoder reference */
 444     xvid_enc_create.version = XVID_VERSION;
 445
 446     /* Store the desired frame size */
 447     xvid_enc_create.width = x->xsize = avctx->width;
 448     xvid_enc_create.height = x->ysize = avctx->height;
 449
 450     /* Xvid can determine the proper profile to use */
 451     /* xvid_enc_create.profile = XVID_PROFILE_S_L3; */
 452
 453     /* We don't use zones */
 454     xvid_enc_create.zones = NULL;
 455     xvid_enc_create.num_zones = 0;
 456
 457     xvid_enc_create.num_threads = avctx->thread_count;
 458
 459     xvid_enc_create.plugins = plugins;
 460     xvid_enc_create.num_plugins = 0;
 461
 462     /* Initialize Buffers */
 463     x->twopassbuffer = NULL;
 464     x->old_twopassbuffer = NULL;
 465     x->twopassfile = NULL;
 466
 467     if( xvid_flags & CODEC_FLAG_PASS1 ) {
 468         rc2pass1.version = XVID_VERSION;
 469         rc2pass1.context = x;
 470         x->twopassbuffer = av_malloc(BUFFER_SIZE);
 471         x->old_twopassbuffer = av_malloc(BUFFER_SIZE);
 472         if( x->twopassbuffer == NULL || x->old_twopassbuffer == NULL ) {
 473             av_log(avctx, AV_LOG_ERROR,
 474                 "Xvid: Cannot allocate 2-pass log buffers\n");
 475             return -1;
 476         }
 477         x->twopassbuffer[0] = x->old_twopassbuffer[0] = 0;
 478
 479         plugins[xvid_enc_create.num_plugins].func = xvid_ff_2pass;
 480         plugins[xvid_enc_create.num_plugins].param = &rc2pass1;
 481         xvid_enc_create.num_plugins++;
 482     } else if( xvid_flags & CODEC_FLAG_PASS2 ) {
 483         rc2pass2.version = XVID_VERSION;
 484         rc2pass2.bitrate = avctx->bit_rate;
 485
 486         fd = ff_tempfile("xvidff.", &x->twopassfile);
 487         if( fd == -1 ) {
 488             av_log(avctx, AV_LOG_ERROR,
 489                 "Xvid: Cannot write 2-pass pipe\n");
 490             return -1;
 491         }
 492
 493         if( avctx->stats_in == NULL ) {
 494             av_log(avctx, AV_LOG_ERROR,
 495                 "Xvid: No 2-pass information loaded for second pass\n");
 496             return -1;
 497         }
 498
 499         if( strlen(avctx->stats_in) >
 500               write(fd, avctx->stats_in, strlen(avctx->stats_in)) ) {
 501             close(fd);
 502             av_log(avctx, AV_LOG_ERROR,
 503                 "Xvid: Cannot write to 2-pass pipe\n");
 504             return -1;
 505         }
 506
 507         close(fd);
 508         rc2pass2.filename = x->twopassfile;
 509         plugins[xvid_enc_create.num_plugins].func = xvid_plugin_2pass2;
 510         plugins[xvid_enc_create.num_plugins].param = &rc2pass2;
 511         xvid_enc_create.num_plugins++;
 512     } else if( !(xvid_flags & CODEC_FLAG_QSCALE) ) {
 513         /* Single Pass Bitrate Control! */
 514         single.version = XVID_VERSION;
 515         single.bitrate = avctx->bit_rate;
 516
 517         plugins[xvid_enc_create.num_plugins].func = xvid_plugin_single;
 518         plugins[xvid_enc_create.num_plugins].param = &single;
 519         xvid_enc_create.num_plugins++;
 520     }
 521
 522     /* Luminance Masking */
 523     if( 0.0 != avctx->lumi_masking ) {
 524         plugins[xvid_enc_create.num_plugins].func = xvid_plugin_lumimasking;
 525         plugins[xvid_enc_create.num_plugins].param = NULL;
 526         xvid_enc_create.num_plugins++;
 527     }
 528
 529     /* Frame Rate and Key Frames */
 530     xvid_correct_framerate(avctx);
 531     xvid_enc_create.fincr = avctx->time_base.num;
 532     xvid_enc_create.fbase = avctx->time_base.den;
 533     if( avctx->gop_size > 0 )
 534         xvid_enc_create.max_key_interval = avctx->gop_size;
 535     else
 536         xvid_enc_create.max_key_interval = 240; /* Xvid's best default */
 537
 538     /* Quants */
 539     if( xvid_flags & CODEC_FLAG_QSCALE ) x->qscale = 1;
 540     else x->qscale = 0;
 541
 542     xvid_enc_create.min_quant[0] = avctx->qmin;
 543     xvid_enc_create.min_quant[1] = avctx->qmin;
 544     xvid_enc_create.min_quant[2] = avctx->qmin;
 545     xvid_enc_create.max_quant[0] = avctx->qmax;
 546     xvid_enc_create.max_quant[1] = avctx->qmax;
 547     xvid_enc_create.max_quant[2] = avctx->qmax;
 548
 549     /* Quant Matrices */
 550     x->intra_matrix = x->inter_matrix = NULL;
 551     if( avctx->mpeg_quant )
 552        x->vol_flags |= XVID_VOL_MPEGQUANT;
 553     if( (avctx->intra_matrix || avctx->inter_matrix) ) {
 554        x->vol_flags |= XVID_VOL_MPEGQUANT;
 555
 556        if( avctx->intra_matrix ) {
 557            intra = avctx->intra_matrix;
 558            x->intra_matrix = av_malloc(sizeof(unsigned char) * 64);
 559        } else
 560            intra = NULL;
 561        if( avctx->inter_matrix ) {
 562            inter = avctx->inter_matrix;
 563            x->inter_matrix = av_malloc(sizeof(unsigned char) * 64);
 564        } else
 565            inter = NULL;
 566
 567        for( i = 0; i < 64; i++ ) {
 568            if( intra )
 569                x->intra_matrix[i] = (unsigned char)intra[i];
 570            if( inter )
 571                x->inter_matrix[i] = (unsigned char)inter[i];
 572        }
 573     }
 574
 575     /* Misc Settings */
 576     xvid_enc_create.frame_drop_ratio = 0;
 577     xvid_enc_create.global = 0;
 578     if( xvid_flags & CODEC_FLAG_CLOSED_GOP )
 579         xvid_enc_create.global |= XVID_GLOBAL_CLOSED_GOP;
 580
 581     /* Determines which codec mode we are operating in */
 582     avctx->extradata = NULL;
 583     avctx->extradata_size = 0;
 584     if( xvid_flags & CODEC_FLAG_GLOBAL_HEADER ) {
 585         /* In this case, we are claiming to be MPEG4 */
 586         x->quicktime_format = 1;
 587         avctx->codec_id = AV_CODEC_ID_MPEG4;
 588     } else {
 589         /* We are claiming to be Xvid */
 590         x->quicktime_format = 0;
 591         if(!avctx->codec_tag)
 592             avctx->codec_tag = AV_RL32("xvid");
 593     }
 594
 595     /* Bframes */
 596     xvid_enc_create.max_bframes = avctx->max_b_frames;
 597     xvid_enc_create.bquant_offset = 100 * avctx->b_quant_offset;
 598     xvid_enc_create.bquant_ratio = 100 * avctx->b_quant_factor;
 599     if( avctx->max_b_frames > 0  && !x->quicktime_format ) xvid_enc_create.global |= XVID_GLOBAL_PACKED;
 600
 601     /* Create encoder context */
 602     xerr = xvid_encore(NULL, XVID_ENC_CREATE, &xvid_enc_create, NULL);
 603     if( xerr ) {
 604         av_log(avctx, AV_LOG_ERROR, "Xvid: Could not create encoder reference\n");
 605         return -1;
 606     }
 607
 608     x->encoder_handle = xvid_enc_create.handle;
 609     avctx->coded_frame = &x->encoded_picture;
 610
 611     return 0;
 612 }
 613
 614 static int xvid_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
 615                              const AVFrame *picture, int *got_packet)
 616 {
 617     int xerr, i, ret, user_packet = !!pkt->data;
 618     char *tmp;
 619     struct xvid_context *x = avctx->priv_data;
 620     AVFrame *p = &x->encoded_picture;
 621     int mb_width   = (avctx->width  + 15) / 16;
 622     int mb_height  = (avctx->height + 15) / 16;
 623
 624     xvid_enc_frame_t xvid_enc_frame = { 0 };
 625     xvid_enc_stats_t xvid_enc_stats = { 0 };
 626
 627     if (!user_packet &&
 628         (ret = av_new_packet(pkt, mb_width*mb_height*MAX_MB_BYTES + FF_MIN_BUFFER_SIZE)) < 0) {
 629         av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
 630         return ret;
 631     }
 632
 633     /* Start setting up the frame */
 634     xvid_enc_frame.version = XVID_VERSION;
 635     xvid_enc_stats.version = XVID_VERSION;
 636     *p = *picture;
 637
 638     /* Let Xvid know where to put the frame. */
 639     xvid_enc_frame.bitstream = pkt->data;
 640     xvid_enc_frame.length    = pkt->size;
 641
 642     /* Initialize input image fields */
 643     if( avctx->pix_fmt != AV_PIX_FMT_YUV420P ) {
 644         av_log(avctx, AV_LOG_ERROR, "Xvid: Color spaces other than 420p not supported\n");
 645         return -1;
 646     }
 647
 648     xvid_enc_frame.input.csp = XVID_CSP_PLANAR; /* YUV420P */
 649
 650     for( i = 0; i < 4; i++ ) {
 651         xvid_enc_frame.input.plane[i] = picture->data[i];
 652         xvid_enc_frame.input.stride[i] = picture->linesize[i];
 653     }
 654
 655     /* Encoder Flags */
 656     xvid_enc_frame.vop_flags = x->vop_flags;
 657     xvid_enc_frame.vol_flags = x->vol_flags;
 658     xvid_enc_frame.motion = x->me_flags;
 659     xvid_enc_frame.type =
 660         picture->pict_type == AV_PICTURE_TYPE_I ? XVID_TYPE_IVOP :
 661         picture->pict_type == AV_PICTURE_TYPE_P ? XVID_TYPE_PVOP :
 662         picture->pict_type == AV_PICTURE_TYPE_B ? XVID_TYPE_BVOP :
 663                                           XVID_TYPE_AUTO;
 664
 665     /* Pixel aspect ratio setting */
 666     if (avctx->sample_aspect_ratio.num < 1 || avctx->sample_aspect_ratio.num > 255 ||
 667         avctx->sample_aspect_ratio.den < 1 || avctx->sample_aspect_ratio.den > 255) {
 668         av_log(avctx, AV_LOG_ERROR, "Invalid pixel aspect ratio %i/%i\n",
 669                avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den);
 670         return -1;
 671     }
 672     xvid_enc_frame.par = XVID_PAR_EXT;
 673     xvid_enc_frame.par_width  = avctx->sample_aspect_ratio.num;
 674     xvid_enc_frame.par_height = avctx->sample_aspect_ratio.den;
 675
 676     /* Quant Setting */
 677     if( x->qscale ) xvid_enc_frame.quant = picture->quality / FF_QP2LAMBDA;
 678     else xvid_enc_frame.quant = 0;
 679
 680     /* Matrices */
 681     xvid_enc_frame.quant_intra_matrix = x->intra_matrix;
 682     xvid_enc_frame.quant_inter_matrix = x->inter_matrix;
 683
 684     /* Encode */
 685     xerr = xvid_encore(x->encoder_handle, XVID_ENC_ENCODE,
 686         &xvid_enc_frame, &xvid_enc_stats);
 687
 688     /* Two-pass log buffer swapping */
 689     avctx->stats_out = NULL;
 690     if( x->twopassbuffer ) {
 691         tmp = x->old_twopassbuffer;
 692         x->old_twopassbuffer = x->twopassbuffer;
 693         x->twopassbuffer = tmp;
 694         x->twopassbuffer[0] = 0;
 695         if( x->old_twopassbuffer[0] != 0 ) {
 696             avctx->stats_out = x->old_twopassbuffer;
 697         }
 698     }
 699
 700     if (xerr > 0) {
 701         *got_packet = 1;
 702
 703         p->quality = xvid_enc_stats.quant * FF_QP2LAMBDA;
 704         if( xvid_enc_stats.type == XVID_TYPE_PVOP )
 705             p->pict_type = AV_PICTURE_TYPE_P;
 706         else if( xvid_enc_stats.type == XVID_TYPE_BVOP )
 707             p->pict_type = AV_PICTURE_TYPE_B;
 708         else if( xvid_enc_stats.type == XVID_TYPE_SVOP )
 709             p->pict_type = AV_PICTURE_TYPE_S;
 710         else
 711             p->pict_type = AV_PICTURE_TYPE_I;
 712         if( xvid_enc_frame.out_flags & XVID_KEYFRAME ) {
 713             p->key_frame = 1;
 714             pkt->flags |= AV_PKT_FLAG_KEY;
 715             if( x->quicktime_format )
 716                 return xvid_strip_vol_header(avctx, pkt,
 717                     xvid_enc_stats.hlength, xerr);
 718          } else
 719             p->key_frame = 0;
 720
 721         pkt->size = xerr;
 722
 723         return 0;
 724     } else {
 725         if (!user_packet)
 726             av_free_packet(pkt);
 727         if (!xerr)
 728             return 0;
 729         av_log(avctx, AV_LOG_ERROR, "Xvid: Encoding Error Occurred: %i\n", xerr);
 730         return -1;
 731     }
 732 }
 733
 734 static av_cold int xvid_encode_close(AVCodecContext *avctx) {
 735     struct xvid_context *x = avctx->priv_data;
 736
 737     xvid_encore(x->encoder_handle, XVID_ENC_DESTROY, NULL, NULL);
 738
 739     av_freep(&avctx->extradata);
 740     if( x->twopassbuffer != NULL ) {
 741         av_free(x->twopassbuffer);
 742         av_free(x->old_twopassbuffer);
 743     }
 744     av_free(x->twopassfile);
 745     av_free(x->intra_matrix);
 746     av_free(x->inter_matrix);
 747
 748     return 0;
 749 }
 750
 751 AVCodec ff_libxvid_encoder = {
 752     .name           = "libxvid",
 753     .type           = AVMEDIA_TYPE_VIDEO,
 754     .id             = AV_CODEC_ID_MPEG4,
 755     .priv_data_size = sizeof(struct xvid_context),
 756     .init           = xvid_encode_init,
 757     .encode2        = xvid_encode_frame,
 758     .close          = xvid_encode_close,
 759     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
 760     .long_name      = NULL_IF_CONFIG_SMALL("libxvidcore MPEG-4 part 2"),
 761 };