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  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.  
  30. #include "libavutil/cpu.h"
  31. #include "libavutil/file.h"
  32. #include "libavutil/intreadwrite.h"
  33. #include "libavutil/mathematics.h"
  34.  
  35. #include "avcodec.h"
  36. #include "internal.h"
  37. #include "libxvid.h"
  38. #include "mpegvideo.h"
  39.  
  40. #if HAVE_UNISTD_H
  41. #include <unistd.h>
  42. #endif
  43.  
  44. #if HAVE_IO_H
  45. #include <io.h>
  46. #endif
  47.  
  48. /**
  49.  * Buffer management macros.
  50.  */
  51. #define BUFFER_SIZE         1024
  52. #define BUFFER_REMAINING(x) (BUFFER_SIZE - strlen(x))
  53. #define BUFFER_CAT(x)       (&((x)[strlen(x)]))
  54.  
  55. /**
  56.  * Structure for the private Xvid context.
  57.  * This stores all the private context for the codec.
  58.  */
  59. struct xvid_context {
  60.     AVClass *class;
  61.     void *encoder_handle;          /**< Handle for Xvid encoder */
  62.     int xsize;                     /**< Frame x size */
  63.     int ysize;                     /**< Frame y size */
  64.     int vop_flags;                 /**< VOP flags for Xvid encoder */
  65.     int vol_flags;                 /**< VOL flags for Xvid encoder */
  66.     int me_flags;                  /**< Motion Estimation flags */
  67.     int qscale;                    /**< Do we use constant scale? */
  68.     int quicktime_format;          /**< Are we in a QT-based format? */
  69.     char *twopassbuffer;           /**< Character buffer for two-pass */
  70.     char *old_twopassbuffer;       /**< Old character buffer (two-pass) */
  71.     char *twopassfile;             /**< second pass temp file name */
  72.     int twopassfd;
  73.     unsigned char *intra_matrix;   /**< P-Frame Quant Matrix */
  74.     unsigned char *inter_matrix;   /**< I-Frame Quant Matrix */
  75.     int lumi_aq;                   /**< Lumi masking as an aq method */
  76.     int variance_aq;               /**< Variance adaptive quantization */
  77.     int ssim;                      /**< SSIM information display mode */
  78.     int ssim_acc;                  /**< SSIM accuracy. 0: accurate. 4: fast. */
  79.     int gmc;
  80.     int me_quality;                /**< Motion estimation quality. 0: fast 6: best. */
  81. };
  82.  
  83. /**
  84.  * Structure for the private first-pass plugin.
  85.  */
  86. struct xvid_ff_pass1 {
  87.     int version;                    /**< Xvid version */
  88.     struct xvid_context *context;   /**< Pointer to private context */
  89. };
  90.  
  91. static int xvid_encode_close(AVCodecContext *avctx);
  92.  
  93. /*
  94.  * Xvid 2-Pass Kludge Section
  95.  *
  96.  * Xvid's default 2-pass doesn't allow us to create data as we need to, so
  97.  * this section spends time replacing the first pass plugin so we can write
  98.  * statistic information as libavcodec requests in. We have another kludge
  99.  * that allows us to pass data to the second pass in Xvid without a custom
  100.  * rate-control plugin.
  101.  */
  102.  
  103. /**
  104.  * Initialize the two-pass plugin and context.
  105.  *
  106.  * @param param Input construction parameter structure
  107.  * @param handle Private context handle
  108.  * @return Returns XVID_ERR_xxxx on failure, or 0 on success.
  109.  */
  110. static int xvid_ff_2pass_create(xvid_plg_create_t *param, void **handle)
  111. {
  112.     struct xvid_ff_pass1 *x = (struct xvid_ff_pass1 *) param->param;
  113.     char *log = x->context->twopassbuffer;
  114.  
  115.     /* Do a quick bounds check */
  116.     if (!log)
  117.         return XVID_ERR_FAIL;
  118.  
  119.     /* We use snprintf() */
  120.     /* This is because we can safely prevent a buffer overflow */
  121.     log[0] = 0;
  122.     snprintf(log, BUFFER_REMAINING(log),
  123.              "# ffmpeg 2-pass log file, using xvid codec\n");
  124.     snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),
  125.              "# Do not modify. libxvidcore version: %d.%d.%d\n\n",
  126.              XVID_VERSION_MAJOR(XVID_VERSION),
  127.              XVID_VERSION_MINOR(XVID_VERSION),
  128.              XVID_VERSION_PATCH(XVID_VERSION));
  129.  
  130.     *handle = x->context;
  131.     return 0;
  132. }
  133.  
  134. /**
  135.  * Destroy the two-pass plugin context.
  136.  *
  137.  * @param ref Context pointer for the plugin
  138.  * @param param Destrooy context
  139.  * @return Returns 0, success guaranteed
  140.  */
  141. static int xvid_ff_2pass_destroy(struct xvid_context *ref,
  142.                                  xvid_plg_destroy_t *param)
  143. {
  144.     /* Currently cannot think of anything to do on destruction */
  145.     /* Still, the framework should be here for reference/use */
  146.     if (ref->twopassbuffer)
  147.         ref->twopassbuffer[0] = 0;
  148.     return 0;
  149. }
  150.  
  151. /**
  152.  * Enable fast encode mode during the first pass.
  153.  *
  154.  * @param ref Context pointer for the plugin
  155.  * @param param Frame data
  156.  * @return Returns 0, success guaranteed
  157.  */
  158. static int xvid_ff_2pass_before(struct xvid_context *ref,
  159.                                 xvid_plg_data_t *param)
  160. {
  161.     int motion_remove;
  162.     int motion_replacements;
  163.     int vop_remove;
  164.  
  165.     /* Nothing to do here, result is changed too much */
  166.     if (param->zone && param->zone->mode == XVID_ZONE_QUANT)
  167.         return 0;
  168.  
  169.     /* We can implement a 'turbo' first pass mode here */
  170.     param->quant = 2;
  171.  
  172.     /* Init values */
  173.     motion_remove       = ~XVID_ME_CHROMA_PVOP &
  174.                           ~XVID_ME_CHROMA_BVOP &
  175.                           ~XVID_ME_EXTSEARCH16 &
  176.                           ~XVID_ME_ADVANCEDDIAMOND16;
  177.     motion_replacements = XVID_ME_FAST_MODEINTERPOLATE |
  178.                           XVID_ME_SKIP_DELTASEARCH     |
  179.                           XVID_ME_FASTREFINE16         |
  180.                           XVID_ME_BFRAME_EARLYSTOP;
  181.     vop_remove          = ~XVID_VOP_MODEDECISION_RD      &
  182.                           ~XVID_VOP_FAST_MODEDECISION_RD &
  183.                           ~XVID_VOP_TRELLISQUANT         &
  184.                           ~XVID_VOP_INTER4V              &
  185.                           ~XVID_VOP_HQACPRED;
  186.  
  187.     param->vol_flags    &= ~XVID_VOL_GMC;
  188.     param->vop_flags    &= vop_remove;
  189.     param->motion_flags &= motion_remove;
  190.     param->motion_flags |= motion_replacements;
  191.  
  192.     return 0;
  193. }
  194.  
  195. /**
  196.  * Capture statistic data and write it during first pass.
  197.  *
  198.  * @param ref Context pointer for the plugin
  199.  * @param param Statistic data
  200.  * @return Returns XVID_ERR_xxxx on failure, or 0 on success
  201.  */
  202. static int xvid_ff_2pass_after(struct xvid_context *ref,
  203.                                xvid_plg_data_t *param)
  204. {
  205.     char *log = ref->twopassbuffer;
  206.     const char *frame_types = " ipbs";
  207.     char frame_type;
  208.  
  209.     /* Quick bounds check */
  210.     if (!log)
  211.         return XVID_ERR_FAIL;
  212.  
  213.     /* Convert the type given to us into a character */
  214.     if (param->type < 5 && param->type > 0)
  215.         frame_type = frame_types[param->type];
  216.     else
  217.         return XVID_ERR_FAIL;
  218.  
  219.     snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),
  220.              "%c %d %d %d %d %d %d\n",
  221.              frame_type, param->stats.quant, param->stats.kblks,
  222.              param->stats.mblks, param->stats.ublks,
  223.              param->stats.length, param->stats.hlength);
  224.  
  225.     return 0;
  226. }
  227.  
  228. /**
  229.  * Dispatch function for our custom plugin.
  230.  * This handles the dispatch for the Xvid plugin. It passes data
  231.  * on to other functions for actual processing.
  232.  *
  233.  * @param ref Context pointer for the plugin
  234.  * @param cmd The task given for us to complete
  235.  * @param p1 First parameter (varies)
  236.  * @param p2 Second parameter (varies)
  237.  * @return Returns XVID_ERR_xxxx on failure, or 0 on success
  238.  */
  239. static int xvid_ff_2pass(void *ref, int cmd, void *p1, void *p2)
  240. {
  241.     switch (cmd) {
  242.     case XVID_PLG_INFO:
  243.     case XVID_PLG_FRAME:
  244.         return 0;
  245.     case XVID_PLG_BEFORE:
  246.         return xvid_ff_2pass_before(ref, p1);
  247.     case XVID_PLG_CREATE:
  248.         return xvid_ff_2pass_create(p1, p2);
  249.     case XVID_PLG_AFTER:
  250.         return xvid_ff_2pass_after(ref, p1);
  251.     case XVID_PLG_DESTROY:
  252.         return xvid_ff_2pass_destroy(ref, p1);
  253.     default:
  254.         return XVID_ERR_FAIL;
  255.     }
  256. }
  257.  
  258. /**
  259.  * Routine to create a global VO/VOL header for MP4 container.
  260.  * What we do here is extract the header from the Xvid bitstream
  261.  * as it is encoded. We also strip the repeated headers from the
  262.  * bitstream when a global header is requested for MPEG-4 ISO
  263.  * compliance.
  264.  *
  265.  * @param avctx AVCodecContext pointer to context
  266.  * @param frame Pointer to encoded frame data
  267.  * @param header_len Length of header to search
  268.  * @param frame_len Length of encoded frame data
  269.  * @return Returns new length of frame data
  270.  */
  271. static int xvid_strip_vol_header(AVCodecContext *avctx, AVPacket *pkt,
  272.                                  unsigned int header_len,
  273.                                  unsigned int frame_len)
  274. {
  275.     int vo_len = 0, i;
  276.  
  277.     for (i = 0; i < header_len - 3; i++) {
  278.         if (pkt->data[i]     == 0x00 &&
  279.             pkt->data[i + 1] == 0x00 &&
  280.             pkt->data[i + 2] == 0x01 &&
  281.             pkt->data[i + 3] == 0xB6) {
  282.             vo_len = i;
  283.             break;
  284.         }
  285.     }
  286.  
  287.     if (vo_len > 0) {
  288.         /* We need to store the header, so extract it */
  289.         if (!avctx->extradata) {
  290.             avctx->extradata = av_malloc(vo_len);
  291.             if (!avctx->extradata)
  292.                 return AVERROR(ENOMEM);
  293.             memcpy(avctx->extradata, pkt->data, vo_len);
  294.             avctx->extradata_size = vo_len;
  295.         }
  296.         /* Less dangerous now, memmove properly copies the two
  297.          * chunks of overlapping data */
  298.         memmove(pkt->data, &pkt->data[vo_len], frame_len - vo_len);
  299.         pkt->size = frame_len - vo_len;
  300.     }
  301.     return 0;
  302. }
  303.  
  304. /**
  305.  * Routine to correct a possibly erroneous framerate being fed to us.
  306.  * Xvid currently chokes on framerates where the ticks per frame is
  307.  * extremely large. This function works to correct problems in this area
  308.  * by estimating a new framerate and taking the simpler fraction of
  309.  * the two presented.
  310.  *
  311.  * @param avctx Context that contains the framerate to correct.
  312.  */
  313. static void xvid_correct_framerate(AVCodecContext *avctx)
  314. {
  315.     int frate, fbase;
  316.     int est_frate, est_fbase;
  317.     int gcd;
  318.     float est_fps, fps;
  319.  
  320.     frate = avctx->time_base.den;
  321.     fbase = avctx->time_base.num;
  322.  
  323.     gcd = av_gcd(frate, fbase);
  324.     if (gcd > 1) {
  325.         frate /= gcd;
  326.         fbase /= gcd;
  327.     }
  328.  
  329.     if (frate <= 65000 && fbase <= 65000) {
  330.         avctx->time_base.den = frate;
  331.         avctx->time_base.num = fbase;
  332.         return;
  333.     }
  334.  
  335.     fps     = (float) frate / (float) fbase;
  336.     est_fps = roundf(fps * 1000.0) / 1000.0;
  337.  
  338.     est_frate = (int) est_fps;
  339.     if (est_fps > (int) est_fps) {
  340.         est_frate = (est_frate + 1) * 1000;
  341.         est_fbase = (int) roundf((float) est_frate / est_fps);
  342.     } else
  343.         est_fbase = 1;
  344.  
  345.     gcd = av_gcd(est_frate, est_fbase);
  346.     if (gcd > 1) {
  347.         est_frate /= gcd;
  348.         est_fbase /= gcd;
  349.     }
  350.  
  351.     if (fbase > est_fbase) {
  352.         avctx->time_base.den = est_frate;
  353.         avctx->time_base.num = est_fbase;
  354.         av_log(avctx, AV_LOG_DEBUG,
  355.                "Xvid: framerate re-estimated: %.2f, %.3f%% correction\n",
  356.                est_fps, (((est_fps - fps) / fps) * 100.0));
  357.     } else {
  358.         avctx->time_base.den = frate;
  359.         avctx->time_base.num = fbase;
  360.     }
  361. }
  362.  
  363. static av_cold int xvid_encode_init(AVCodecContext *avctx)
  364. {
  365.     int xerr, i, ret = -1;
  366.     int xvid_flags = avctx->flags;
  367.     struct xvid_context *x = avctx->priv_data;
  368.     uint16_t *intra, *inter;
  369.     int fd;
  370.  
  371.     xvid_plugin_single_t      single          = { 0 };
  372.     struct xvid_ff_pass1      rc2pass1        = { 0 };
  373.     xvid_plugin_2pass2_t      rc2pass2        = { 0 };
  374.     xvid_plugin_lumimasking_t masking_l       = { 0 }; /* For lumi masking */
  375.     xvid_plugin_lumimasking_t masking_v       = { 0 }; /* For variance AQ */
  376.     xvid_plugin_ssim_t        ssim            = { 0 };
  377.     xvid_gbl_init_t           xvid_gbl_init   = { 0 };
  378.     xvid_enc_create_t         xvid_enc_create = { 0 };
  379.     xvid_enc_plugin_t         plugins[4];
  380.  
  381.     x->twopassfd = -1;
  382.  
  383.     /* Bring in VOP flags from ffmpeg command-line */
  384.     x->vop_flags = XVID_VOP_HALFPEL;              /* Bare minimum quality */
  385.     if (xvid_flags & AV_CODEC_FLAG_4MV)
  386.         x->vop_flags    |= XVID_VOP_INTER4V;      /* Level 3 */
  387.     if (avctx->trellis)
  388.         x->vop_flags    |= XVID_VOP_TRELLISQUANT; /* Level 5 */
  389.     if (xvid_flags & AV_CODEC_FLAG_AC_PRED)
  390.         x->vop_flags    |= XVID_VOP_HQACPRED;     /* Level 6 */
  391.     if (xvid_flags & AV_CODEC_FLAG_GRAY)
  392.         x->vop_flags    |= XVID_VOP_GREYSCALE;
  393.  
  394.     /* Decide which ME quality setting to use */
  395.     x->me_flags = 0;
  396.     switch (x->me_quality) {
  397.     case 6:
  398.     case 5:
  399.         x->me_flags |= XVID_ME_EXTSEARCH16 |
  400.                        XVID_ME_EXTSEARCH8;
  401.     case 4:
  402.     case 3:
  403.         x->me_flags |= XVID_ME_ADVANCEDDIAMOND8 |
  404.                        XVID_ME_HALFPELREFINE8   |
  405.                        XVID_ME_CHROMA_PVOP      |
  406.                        XVID_ME_CHROMA_BVOP;
  407.     case 2:
  408.     case 1:
  409.         x->me_flags |= XVID_ME_ADVANCEDDIAMOND16 |
  410.                        XVID_ME_HALFPELREFINE16;
  411. #if FF_API_MOTION_EST
  412. FF_DISABLE_DEPRECATION_WARNINGS
  413.         break;
  414.     default:
  415.         switch (avctx->me_method) {
  416.         case ME_FULL:   /* Quality 6 */
  417.              x->me_flags |= XVID_ME_EXTSEARCH16 |
  418.                             XVID_ME_EXTSEARCH8;
  419.         case ME_EPZS:   /* Quality 4 */
  420.              x->me_flags |= XVID_ME_ADVANCEDDIAMOND8 |
  421.                             XVID_ME_HALFPELREFINE8   |
  422.                             XVID_ME_CHROMA_PVOP      |
  423.                             XVID_ME_CHROMA_BVOP;
  424.         case ME_LOG:    /* Quality 2 */
  425.         case ME_PHODS:
  426.         case ME_X1:
  427.              x->me_flags |= XVID_ME_ADVANCEDDIAMOND16 |
  428.                             XVID_ME_HALFPELREFINE16;
  429.         case ME_ZERO:   /* Quality 0 */
  430.         default:
  431.             break;
  432.         }
  433. FF_ENABLE_DEPRECATION_WARNINGS
  434. #endif
  435.     }
  436.  
  437.     /* Decide how we should decide blocks */
  438.     switch (avctx->mb_decision) {
  439.     case 2:
  440.         x->vop_flags |=  XVID_VOP_MODEDECISION_RD;
  441.         x->me_flags  |=  XVID_ME_HALFPELREFINE8_RD    |
  442.                          XVID_ME_QUARTERPELREFINE8_RD |
  443.                          XVID_ME_EXTSEARCH_RD         |
  444.                          XVID_ME_CHECKPREDICTION_RD;
  445.     case 1:
  446.         if (!(x->vop_flags & XVID_VOP_MODEDECISION_RD))
  447.             x->vop_flags |= XVID_VOP_FAST_MODEDECISION_RD;
  448.         x->me_flags |= XVID_ME_HALFPELREFINE16_RD |
  449.                        XVID_ME_QUARTERPELREFINE16_RD;
  450.     default:
  451.         break;
  452.     }
  453.  
  454.     /* Bring in VOL flags from ffmpeg command-line */
  455. #if FF_API_GMC
  456.     if (avctx->flags & CODEC_FLAG_GMC)
  457.         x->gmc = 1;
  458. #endif
  459.  
  460.     x->vol_flags = 0;
  461.     if (x->gmc) {
  462.         x->vol_flags |= XVID_VOL_GMC;
  463.         x->me_flags  |= XVID_ME_GME_REFINE;
  464.     }
  465.     if (xvid_flags & AV_CODEC_FLAG_QPEL) {
  466.         x->vol_flags |= XVID_VOL_QUARTERPEL;
  467.         x->me_flags  |= XVID_ME_QUARTERPELREFINE16;
  468.         if (x->vop_flags & XVID_VOP_INTER4V)
  469.             x->me_flags |= XVID_ME_QUARTERPELREFINE8;
  470.     }
  471.  
  472.     xvid_gbl_init.version   = XVID_VERSION;
  473.     xvid_gbl_init.debug     = 0;
  474.     xvid_gbl_init.cpu_flags = 0;
  475.  
  476.     /* Initialize */
  477.     xvid_global(NULL, XVID_GBL_INIT, &xvid_gbl_init, NULL);
  478.  
  479.     /* Create the encoder reference */
  480.     xvid_enc_create.version = XVID_VERSION;
  481.  
  482.     /* Store the desired frame size */
  483.     xvid_enc_create.width  =
  484.     x->xsize               = avctx->width;
  485.     xvid_enc_create.height =
  486.     x->ysize               = avctx->height;
  487.  
  488.     /* Xvid can determine the proper profile to use */
  489.     /* xvid_enc_create.profile = XVID_PROFILE_S_L3; */
  490.  
  491.     /* We don't use zones */
  492.     xvid_enc_create.zones     = NULL;
  493.     xvid_enc_create.num_zones = 0;
  494.  
  495.     xvid_enc_create.num_threads = avctx->thread_count;
  496. #if (XVID_VERSION <= 0x010303) && (XVID_VERSION >= 0x010300)
  497.     /* workaround for a bug in libxvidcore */
  498.     if (avctx->height <= 16) {
  499.         if (avctx->thread_count < 2) {
  500.             xvid_enc_create.num_threads = 0;
  501.         } else {
  502.             av_log(avctx, AV_LOG_ERROR,
  503.                    "Too small height for threads > 1.");
  504.             return AVERROR(EINVAL);
  505.         }
  506.     }
  507. #endif
  508.  
  509.     xvid_enc_create.plugins     = plugins;
  510.     xvid_enc_create.num_plugins = 0;
  511.  
  512.     /* Initialize Buffers */
  513.     x->twopassbuffer     = NULL;
  514.     x->old_twopassbuffer = NULL;
  515.     x->twopassfile       = NULL;
  516.  
  517.     if (xvid_flags & AV_CODEC_FLAG_PASS1) {
  518.         rc2pass1.version     = XVID_VERSION;
  519.         rc2pass1.context     = x;
  520.         x->twopassbuffer     = av_malloc(BUFFER_SIZE);
  521.         x->old_twopassbuffer = av_malloc(BUFFER_SIZE);
  522.         if (!x->twopassbuffer || !x->old_twopassbuffer) {
  523.             av_log(avctx, AV_LOG_ERROR,
  524.                    "Xvid: Cannot allocate 2-pass log buffers\n");
  525.             return AVERROR(ENOMEM);
  526.         }
  527.         x->twopassbuffer[0]     =
  528.         x->old_twopassbuffer[0] = 0;
  529.  
  530.         plugins[xvid_enc_create.num_plugins].func  = xvid_ff_2pass;
  531.         plugins[xvid_enc_create.num_plugins].param = &rc2pass1;
  532.         xvid_enc_create.num_plugins++;
  533.     } else if (xvid_flags & AV_CODEC_FLAG_PASS2) {
  534.         rc2pass2.version = XVID_VERSION;
  535.         rc2pass2.bitrate = avctx->bit_rate;
  536.  
  537.         fd = av_tempfile("xvidff.", &x->twopassfile, 0, avctx);
  538.         if (fd < 0) {
  539.             av_log(avctx, AV_LOG_ERROR, "Xvid: Cannot write 2-pass pipe\n");
  540.             return fd;
  541.         }
  542.         x->twopassfd = fd;
  543.  
  544.         if (!avctx->stats_in) {
  545.             av_log(avctx, AV_LOG_ERROR,
  546.                    "Xvid: No 2-pass information loaded for second pass\n");
  547.             return AVERROR(EINVAL);
  548.         }
  549.  
  550.         ret = write(fd, avctx->stats_in, strlen(avctx->stats_in));
  551.         if (ret == -1)
  552.             ret = AVERROR(errno);
  553.         else if (strlen(avctx->stats_in) > ret) {
  554.             av_log(avctx, AV_LOG_ERROR, "Xvid: Cannot write to 2-pass pipe\n");
  555.             ret = AVERROR(EIO);
  556.         }
  557.         if (ret < 0)
  558.             return ret;
  559.  
  560.         rc2pass2.filename                          = x->twopassfile;
  561.         plugins[xvid_enc_create.num_plugins].func  = xvid_plugin_2pass2;
  562.         plugins[xvid_enc_create.num_plugins].param = &rc2pass2;
  563.         xvid_enc_create.num_plugins++;
  564.     } else if (!(xvid_flags & AV_CODEC_FLAG_QSCALE)) {
  565.         /* Single Pass Bitrate Control! */
  566.         single.version = XVID_VERSION;
  567.         single.bitrate = avctx->bit_rate;
  568.  
  569.         plugins[xvid_enc_create.num_plugins].func  = xvid_plugin_single;
  570.         plugins[xvid_enc_create.num_plugins].param = &single;
  571.         xvid_enc_create.num_plugins++;
  572.     }
  573.  
  574.     if (avctx->lumi_masking != 0.0)
  575.         x->lumi_aq = 1;
  576.  
  577.     /* Luminance Masking */
  578.     if (x->lumi_aq) {
  579.         masking_l.method                          = 0;
  580.         plugins[xvid_enc_create.num_plugins].func = xvid_plugin_lumimasking;
  581.  
  582.         /* The old behavior is that when avctx->lumi_masking is specified,
  583.          * plugins[...].param = NULL. Trying to keep the old behavior here. */
  584.         plugins[xvid_enc_create.num_plugins].param =
  585.             avctx->lumi_masking ? NULL : &masking_l;
  586.         xvid_enc_create.num_plugins++;
  587.     }
  588.  
  589.     /* Variance AQ */
  590.     if (x->variance_aq) {
  591.         masking_v.method                           = 1;
  592.         plugins[xvid_enc_create.num_plugins].func  = xvid_plugin_lumimasking;
  593.         plugins[xvid_enc_create.num_plugins].param = &masking_v;
  594.         xvid_enc_create.num_plugins++;
  595.     }
  596.  
  597.     if (x->lumi_aq && x->variance_aq )
  598.         av_log(avctx, AV_LOG_INFO,
  599.                "Both lumi_aq and variance_aq are enabled. The resulting quality"
  600.                "will be the worse one of the two effects made by the AQ.\n");
  601.  
  602.     /* SSIM */
  603.     if (x->ssim) {
  604.         plugins[xvid_enc_create.num_plugins].func  = xvid_plugin_ssim;
  605.         ssim.b_printstat                           = x->ssim == 2;
  606.         ssim.acc                                   = x->ssim_acc;
  607.         ssim.cpu_flags                             = xvid_gbl_init.cpu_flags;
  608.         ssim.b_visualize                           = 0;
  609.         plugins[xvid_enc_create.num_plugins].param = &ssim;
  610.         xvid_enc_create.num_plugins++;
  611.     }
  612.  
  613.     /* Frame Rate and Key Frames */
  614.     xvid_correct_framerate(avctx);
  615.     xvid_enc_create.fincr = avctx->time_base.num;
  616.     xvid_enc_create.fbase = avctx->time_base.den;
  617.     if (avctx->gop_size > 0)
  618.         xvid_enc_create.max_key_interval = avctx->gop_size;
  619.     else
  620.         xvid_enc_create.max_key_interval = 240; /* Xvid's best default */
  621.  
  622.     /* Quants */
  623.     if (xvid_flags & AV_CODEC_FLAG_QSCALE)
  624.         x->qscale = 1;
  625.     else
  626.         x->qscale = 0;
  627.  
  628.     xvid_enc_create.min_quant[0] = avctx->qmin;
  629.     xvid_enc_create.min_quant[1] = avctx->qmin;
  630.     xvid_enc_create.min_quant[2] = avctx->qmin;
  631.     xvid_enc_create.max_quant[0] = avctx->qmax;
  632.     xvid_enc_create.max_quant[1] = avctx->qmax;
  633.     xvid_enc_create.max_quant[2] = avctx->qmax;
  634.  
  635.     /* Quant Matrices */
  636.     x->intra_matrix =
  637.     x->inter_matrix = NULL;
  638.     if (avctx->mpeg_quant)
  639.         x->vol_flags |= XVID_VOL_MPEGQUANT;
  640.     if ((avctx->intra_matrix || avctx->inter_matrix)) {
  641.         x->vol_flags |= XVID_VOL_MPEGQUANT;
  642.  
  643.         if (avctx->intra_matrix) {
  644.             intra           = avctx->intra_matrix;
  645.             x->intra_matrix = av_malloc(sizeof(unsigned char) * 64);
  646.             if (!x->intra_matrix)
  647.                 return AVERROR(ENOMEM);
  648.         } else
  649.             intra = NULL;
  650.         if (avctx->inter_matrix) {
  651.             inter           = avctx->inter_matrix;
  652.             x->inter_matrix = av_malloc(sizeof(unsigned char) * 64);
  653.             if (!x->inter_matrix)
  654.                 return AVERROR(ENOMEM);
  655.         } else
  656.             inter = NULL;
  657.  
  658.         for (i = 0; i < 64; i++) {
  659.             if (intra)
  660.                 x->intra_matrix[i] = (unsigned char) intra[i];
  661.             if (inter)
  662.                 x->inter_matrix[i] = (unsigned char) inter[i];
  663.         }
  664.     }
  665.  
  666.     /* Misc Settings */
  667.     xvid_enc_create.frame_drop_ratio = 0;
  668.     xvid_enc_create.global           = 0;
  669.     if (xvid_flags & AV_CODEC_FLAG_CLOSED_GOP)
  670.         xvid_enc_create.global |= XVID_GLOBAL_CLOSED_GOP;
  671.  
  672.     /* Determines which codec mode we are operating in */
  673.     avctx->extradata      = NULL;
  674.     avctx->extradata_size = 0;
  675.     if (xvid_flags & AV_CODEC_FLAG_GLOBAL_HEADER) {
  676.         /* In this case, we are claiming to be MPEG4 */
  677.         x->quicktime_format = 1;
  678.         avctx->codec_id     = AV_CODEC_ID_MPEG4;
  679.     } else {
  680.         /* We are claiming to be Xvid */
  681.         x->quicktime_format = 0;
  682.         if (!avctx->codec_tag)
  683.             avctx->codec_tag = AV_RL32("xvid");
  684.     }
  685.  
  686.     /* Bframes */
  687.     xvid_enc_create.max_bframes   = avctx->max_b_frames;
  688.     xvid_enc_create.bquant_offset = 100 * avctx->b_quant_offset;
  689.     xvid_enc_create.bquant_ratio  = 100 * avctx->b_quant_factor;
  690.     if (avctx->max_b_frames > 0 && !x->quicktime_format)
  691.         xvid_enc_create.global |= XVID_GLOBAL_PACKED;
  692.  
  693.     av_assert0(xvid_enc_create.num_plugins + (!!x->ssim) + (!!x->variance_aq) + (!!x->lumi_aq) <= FF_ARRAY_ELEMS(plugins));
  694.  
  695.     /* Create encoder context */
  696.     xerr = xvid_encore(NULL, XVID_ENC_CREATE, &xvid_enc_create, NULL);
  697.     if (xerr) {
  698.         av_log(avctx, AV_LOG_ERROR, "Xvid: Could not create encoder reference\n");
  699.         return AVERROR_EXTERNAL;
  700.     }
  701.  
  702.     x->encoder_handle  = xvid_enc_create.handle;
  703.  
  704.     return 0;
  705. }
  706.  
  707. static int xvid_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
  708.                              const AVFrame *picture, int *got_packet)
  709. {
  710.     int xerr, i, ret, user_packet = !!pkt->data;
  711.     struct xvid_context *x = avctx->priv_data;
  712.     int mb_width  = (avctx->width  + 15) / 16;
  713.     int mb_height = (avctx->height + 15) / 16;
  714.     char *tmp;
  715.  
  716.     xvid_enc_frame_t xvid_enc_frame = { 0 };
  717.     xvid_enc_stats_t xvid_enc_stats = { 0 };
  718.  
  719.     if ((ret = ff_alloc_packet2(avctx, pkt, mb_width*(int64_t)mb_height*MAX_MB_BYTES + AV_INPUT_BUFFER_MIN_SIZE, 0)) < 0)
  720.         return ret;
  721.  
  722.     /* Start setting up the frame */
  723.     xvid_enc_frame.version = XVID_VERSION;
  724.     xvid_enc_stats.version = XVID_VERSION;
  725.  
  726.     /* Let Xvid know where to put the frame. */
  727.     xvid_enc_frame.bitstream = pkt->data;
  728.     xvid_enc_frame.length    = pkt->size;
  729.  
  730.     /* Initialize input image fields */
  731.     if (avctx->pix_fmt != AV_PIX_FMT_YUV420P) {
  732.         av_log(avctx, AV_LOG_ERROR,
  733.                "Xvid: Color spaces other than 420P not supported\n");
  734.         return AVERROR(EINVAL);
  735.     }
  736.  
  737.     xvid_enc_frame.input.csp = XVID_CSP_PLANAR; /* YUV420P */
  738.  
  739.     for (i = 0; i < 4; i++) {
  740.         xvid_enc_frame.input.plane[i]  = picture->data[i];
  741.         xvid_enc_frame.input.stride[i] = picture->linesize[i];
  742.     }
  743.  
  744.     /* Encoder Flags */
  745.     xvid_enc_frame.vop_flags = x->vop_flags;
  746.     xvid_enc_frame.vol_flags = x->vol_flags;
  747.     xvid_enc_frame.motion    = x->me_flags;
  748.     xvid_enc_frame.type      =
  749.         picture->pict_type == AV_PICTURE_TYPE_I ? XVID_TYPE_IVOP :
  750.         picture->pict_type == AV_PICTURE_TYPE_P ? XVID_TYPE_PVOP :
  751.         picture->pict_type == AV_PICTURE_TYPE_B ? XVID_TYPE_BVOP :
  752.                                                   XVID_TYPE_AUTO;
  753.  
  754.     /* Pixel aspect ratio setting */
  755.     if (avctx->sample_aspect_ratio.num < 0 || avctx->sample_aspect_ratio.num > 255 ||
  756.         avctx->sample_aspect_ratio.den < 0 || avctx->sample_aspect_ratio.den > 255) {
  757.         av_log(avctx, AV_LOG_WARNING,
  758.                "Invalid pixel aspect ratio %i/%i, limit is 255/255 reducing\n",
  759.                avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den);
  760.         av_reduce(&avctx->sample_aspect_ratio.num, &avctx->sample_aspect_ratio.den,
  761.                    avctx->sample_aspect_ratio.num,  avctx->sample_aspect_ratio.den, 255);
  762.     }
  763.     xvid_enc_frame.par        = XVID_PAR_EXT;
  764.     xvid_enc_frame.par_width  = avctx->sample_aspect_ratio.num;
  765.     xvid_enc_frame.par_height = avctx->sample_aspect_ratio.den;
  766.  
  767.     /* Quant Setting */
  768.     if (x->qscale)
  769.         xvid_enc_frame.quant = picture->quality / FF_QP2LAMBDA;
  770.     else
  771.         xvid_enc_frame.quant = 0;
  772.  
  773.     /* Matrices */
  774.     xvid_enc_frame.quant_intra_matrix = x->intra_matrix;
  775.     xvid_enc_frame.quant_inter_matrix = x->inter_matrix;
  776.  
  777.     /* Encode */
  778.     xerr = xvid_encore(x->encoder_handle, XVID_ENC_ENCODE,
  779.                        &xvid_enc_frame, &xvid_enc_stats);
  780.  
  781.     /* Two-pass log buffer swapping */
  782.     avctx->stats_out = NULL;
  783.     if (x->twopassbuffer) {
  784.         tmp                  = x->old_twopassbuffer;
  785.         x->old_twopassbuffer = x->twopassbuffer;
  786.         x->twopassbuffer     = tmp;
  787.         x->twopassbuffer[0]  = 0;
  788.         if (x->old_twopassbuffer[0] != 0) {
  789.             avctx->stats_out = x->old_twopassbuffer;
  790.         }
  791.     }
  792.  
  793.     if (xerr > 0) {
  794.         int pict_type;
  795.  
  796.         *got_packet = 1;
  797.  
  798.         if (xvid_enc_stats.type == XVID_TYPE_PVOP)
  799.             pict_type = AV_PICTURE_TYPE_P;
  800.         else if (xvid_enc_stats.type == XVID_TYPE_BVOP)
  801.             pict_type = AV_PICTURE_TYPE_B;
  802.         else if (xvid_enc_stats.type == XVID_TYPE_SVOP)
  803.             pict_type = AV_PICTURE_TYPE_S;
  804.         else
  805.             pict_type = AV_PICTURE_TYPE_I;
  806.  
  807. #if FF_API_CODED_FRAME
  808. FF_DISABLE_DEPRECATION_WARNINGS
  809.         avctx->coded_frame->pict_type = pict_type;
  810.         avctx->coded_frame->quality = xvid_enc_stats.quant * FF_QP2LAMBDA;
  811. FF_ENABLE_DEPRECATION_WARNINGS
  812. #endif
  813.  
  814.         ff_side_data_set_encoder_stats(pkt, xvid_enc_stats.quant * FF_QP2LAMBDA, NULL, 0, pict_type);
  815.  
  816.         if (xvid_enc_frame.out_flags & XVID_KEYFRAME) {
  817. #if FF_API_CODED_FRAME
  818. FF_DISABLE_DEPRECATION_WARNINGS
  819.             avctx->coded_frame->key_frame = 1;
  820. FF_ENABLE_DEPRECATION_WARNINGS
  821. #endif
  822.             pkt->flags  |= AV_PKT_FLAG_KEY;
  823.             if (x->quicktime_format)
  824.                 return xvid_strip_vol_header(avctx, pkt,
  825.                                              xvid_enc_stats.hlength, xerr);
  826.         } else {
  827. #if FF_API_CODED_FRAME
  828. FF_DISABLE_DEPRECATION_WARNINGS
  829.             avctx->coded_frame->key_frame = 0;
  830. FF_ENABLE_DEPRECATION_WARNINGS
  831. #endif
  832.         }
  833.  
  834.         pkt->size = xerr;
  835.  
  836.         return 0;
  837.     } else {
  838.         if (!user_packet)
  839.             av_free_packet(pkt);
  840.         if (!xerr)
  841.             return 0;
  842.         av_log(avctx, AV_LOG_ERROR,
  843.                "Xvid: Encoding Error Occurred: %i\n", xerr);
  844.         return AVERROR_EXTERNAL;
  845.     }
  846. }
  847.  
  848. static av_cold int xvid_encode_close(AVCodecContext *avctx)
  849. {
  850.     struct xvid_context *x = avctx->priv_data;
  851.  
  852.     if (x->encoder_handle) {
  853.         xvid_encore(x->encoder_handle, XVID_ENC_DESTROY, NULL, NULL);
  854.         x->encoder_handle = NULL;
  855.     }
  856.  
  857.     av_freep(&avctx->extradata);
  858.     if (x->twopassbuffer) {
  859.         av_freep(&x->twopassbuffer);
  860.         av_freep(&x->old_twopassbuffer);
  861.         avctx->stats_out = NULL;
  862.     }
  863.     if (x->twopassfd>=0) {
  864.         unlink(x->twopassfile);
  865.         close(x->twopassfd);
  866.         x->twopassfd = -1;
  867.     }
  868.     av_freep(&x->twopassfile);
  869.     av_freep(&x->intra_matrix);
  870.     av_freep(&x->inter_matrix);
  871.  
  872.     return 0;
  873. }
  874.  
  875. #define OFFSET(x) offsetof(struct xvid_context, x)
  876. #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
  877. static const AVOption options[] = {
  878.     { "lumi_aq",     "Luminance masking AQ",            OFFSET(lumi_aq),     AV_OPT_TYPE_INT,   { .i64 = 0 },       0,       1, VE         },
  879.     { "variance_aq", "Variance AQ",                     OFFSET(variance_aq), AV_OPT_TYPE_INT,   { .i64 = 0 },       0,       1, VE         },
  880.     { "ssim",        "Show SSIM information to stdout", OFFSET(ssim),        AV_OPT_TYPE_INT,   { .i64 = 0 },       0,       2, VE, "ssim" },
  881.     { "off",         NULL,                                                0, AV_OPT_TYPE_CONST, { .i64 = 0 }, INT_MIN, INT_MAX, VE, "ssim" },
  882.     { "avg",         NULL,                                                0, AV_OPT_TYPE_CONST, { .i64 = 1 }, INT_MIN, INT_MAX, VE, "ssim" },
  883.     { "frame",       NULL,                                                0, AV_OPT_TYPE_CONST, { .i64 = 2 }, INT_MIN, INT_MAX, VE, "ssim" },
  884.     { "ssim_acc",    "SSIM accuracy",                   OFFSET(ssim_acc),    AV_OPT_TYPE_INT,   { .i64 = 2 },       0,       4, VE         },
  885.     { "gmc",         "use GMC",                         OFFSET(gmc),         AV_OPT_TYPE_INT,   { .i64 = 0 },       0,       1, VE         },
  886.     { "me_quality",  "Motion estimation quality",       OFFSET(me_quality),  AV_OPT_TYPE_INT,   { .i64 = 0 },       0,       6, VE         },
  887.     { NULL },
  888. };
  889.  
  890. static const AVClass xvid_class = {
  891.     .class_name = "libxvid",
  892.     .item_name  = av_default_item_name,
  893.     .option     = options,
  894.     .version    = LIBAVUTIL_VERSION_INT,
  895. };
  896.  
  897. AVCodec ff_libxvid_encoder = {
  898.     .name           = "libxvid",
  899.     .long_name      = NULL_IF_CONFIG_SMALL("libxvidcore MPEG-4 part 2"),
  900.     .type           = AVMEDIA_TYPE_VIDEO,
  901.     .id             = AV_CODEC_ID_MPEG4,
  902.     .priv_data_size = sizeof(struct xvid_context),
  903.     .init           = xvid_encode_init,
  904.     .encode2        = xvid_encode_frame,
  905.     .close          = xvid_encode_close,
  906.     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
  907.     .priv_class     = &xvid_class,
  908.     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |
  909.                       FF_CODEC_CAP_INIT_CLEANUP,
  910. };
  911.