/*
  * RoQ Video Encoder.
  *

  * Copyright (C) 2007 Vitor Sessak <vitor1001@gmail.com>

  * Copyright (C) 2004-2007 Eric Lasota
  *    Based on RoQ specs (C) 2001 Tim Ferguson
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**

  * @file

  * id RoQ encoder by Vitor. Based on the Switchblade3 library and the

  * Switchblade3 FFmpeg glue by Eric Lasota.
  */
 
 /*
  * COSTS:
  * Level 1:
  *  SKIP - 2 bits
  *  MOTION - 2 + 8 bits
  *  CODEBOOK - 2 + 8 bits
  *  SUBDIVIDE - 2 + combined subcel cost
  *
  * Level 2:
  *  SKIP - 2 bits
  *  MOTION - 2 + 8 bits
  *  CODEBOOK - 2 + 8 bits
  *  SUBDIVIDE - 2 + 4*8 bits
  *
  * Maximum cost: 138 bits per cel
  *
  * Proper evaluation requires LCD fraction comparison, which requires
  * Squared Error (SE) loss * savings increase
  *
  * Maximum savings increase: 136 bits
  * Maximum SE loss without overflow: 31580641
  * Components in 8x8 supercel: 192
  * Maximum SE precision per component: 164482
  *    >65025, so no truncation is needed (phew)
  */
 
 #include <string.h>
 

 #include "libavutil/attributes.h"

 #include "libavutil/opt.h"

 #include "roqvideo.h"
 #include "bytestream.h"
 #include "elbg.h"

 #include "internal.h"

 #include "mathops.h"

 
 #define CHROMA_BIAS 1
 
 /**
  * Maximum number of generated 4x4 codebooks. Can't be 256 to workaround a
  * Quake 3 bug.
  */

 #define MAX_CBS_4x4 256

 
 #define MAX_CBS_2x2 256 ///< Maximum number of 2x2 codebooks.
 
 /* The cast is useful when multiplying it by INT_MAX */
 #define ROQ_LAMBDA_SCALE ((uint64_t) FF_LAMBDA_SCALE)
 
 /* Macroblock support functions */
 static void unpack_roq_cell(roq_cell *cell, uint8_t u[4*3])
 {
     memcpy(u  , cell->y, 4);
     memset(u+4, cell->u, 4);
     memset(u+8, cell->v, 4);
 }
 
 static void unpack_roq_qcell(uint8_t cb2[], roq_qcell *qcell, uint8_t u[4*4*3])
 {
     int i,cp;
     static const int offsets[4] = {0, 2, 8, 10};
 
     for (cp=0; cp<3; cp++)
         for (i=0; i<4; i++) {
             u[4*4*cp + offsets[i]  ] = cb2[qcell->idx[i]*2*2*3 + 4*cp  ];
             u[4*4*cp + offsets[i]+1] = cb2[qcell->idx[i]*2*2*3 + 4*cp+1];
             u[4*4*cp + offsets[i]+4] = cb2[qcell->idx[i]*2*2*3 + 4*cp+2];
             u[4*4*cp + offsets[i]+5] = cb2[qcell->idx[i]*2*2*3 + 4*cp+3];
         }
 }
 
 
 static void enlarge_roq_mb4(uint8_t base[3*16], uint8_t u[3*64])
 {
     int x,y,cp;
 
     for(cp=0; cp<3; cp++)
         for(y=0; y<8; y++)
             for(x=0; x<8; x++)
                 *u++ = base[(y/2)*4 + (x/2) + 16*cp];
 }
 
 static inline int square(int x)
 {
     return x*x;
 }
 

 static inline int eval_sse(const uint8_t *a, const uint8_t *b, int count)

 {
     int diff=0;
 
     while(count--)
         diff += square(*b++ - *a++);
 
     return diff;
 }
 
 // FIXME Could use DSPContext.sse, but it is not so speed critical (used
 // just for motion estimation).

 static int block_sse(uint8_t * const *buf1, uint8_t * const *buf2, int x1, int y1,
                      int x2, int y2, const int *stride1, const int *stride2, int size)

 {
     int i, k;
     int sse=0;
 
     for (k=0; k<3; k++) {
         int bias = (k ? CHROMA_BIAS : 4);
         for (i=0; i<size; i++)

             sse += bias*eval_sse(buf1[k] + (y1+i)*stride1[k] + x1,
                                  buf2[k] + (y2+i)*stride2[k] + x2, size);

     }
 
     return sse;
 }
 
 static int eval_motion_dist(RoqContext *enc, int x, int y, motion_vect vect,
                              int size)
 {
     int mx=vect.d[0];
     int my=vect.d[1];
 
     if (mx < -7 || mx > 7)
         return INT_MAX;
 
     if (my < -7 || my > 7)
         return INT_MAX;
 
     mx += x;
     my += y;
 
     if ((unsigned) mx > enc->width-size || (unsigned) my > enc->height-size)
         return INT_MAX;
 
     return block_sse(enc->frame_to_enc->data, enc->last_frame->data, x, y,

                      mx, my,
                      enc->frame_to_enc->linesize, enc->last_frame->linesize,
                      size);

 }
 
 /**

  * @return distortion between two macroblocks

  */
 static inline int squared_diff_macroblock(uint8_t a[], uint8_t b[], int size)
 {
     int cp, sdiff=0;
 
     for(cp=0;cp<3;cp++) {
         int bias = (cp ? CHROMA_BIAS : 4);
         sdiff += bias*eval_sse(a, b, size*size);
         a += size*size;
         b += size*size;
     }
 
     return sdiff;
 }
 

 typedef struct SubcelEvaluation {

     int eval_dist[4];
     int best_bit_use;
     int best_coding;
 
     int subCels[4];
     motion_vect motion;
     int cbEntry;

 } SubcelEvaluation;

 typedef struct CelEvaluation {

     int eval_dist[4];
     int best_coding;
 

     SubcelEvaluation subCels[4];

 
     motion_vect motion;
     int cbEntry;
 
     int sourceX, sourceY;

 } CelEvaluation;

 typedef struct RoqCodebooks {

     int numCB4;
     int numCB2;
     int usedCB2[MAX_CBS_2x2];
     int usedCB4[MAX_CBS_4x4];
     uint8_t unpacked_cb2[MAX_CBS_2x2*2*2*3];
     uint8_t unpacked_cb4[MAX_CBS_4x4*4*4*3];
     uint8_t unpacked_cb4_enlarged[MAX_CBS_4x4*8*8*3];

 } RoqCodebooks;

 
 /**
  * Temporary vars
  */

 typedef struct RoqTempData

 {

     CelEvaluation *cel_evals;

 
     int f2i4[MAX_CBS_4x4];
     int i2f4[MAX_CBS_4x4];
     int f2i2[MAX_CBS_2x2];
     int i2f2[MAX_CBS_2x2];
 
     int mainChunkSize;
 
     int numCB4;
     int numCB2;
 

     RoqCodebooks codebooks;

 
     int *closest_cb2;
     int used_option[4];

 } RoqTempdata;

 
 /**

  * Initialize cel evaluators and set their source coordinates

  */

 static int create_cel_evals(RoqContext *enc, RoqTempdata *tempData)

 {
     int n=0, x, y, i;
 

     tempData->cel_evals = av_malloc_array(enc->width*enc->height/64, sizeof(CelEvaluation));

     if (!tempData->cel_evals)
         return AVERROR(ENOMEM);

 
     /* Map to the ROQ quadtree order */
     for (y=0; y<enc->height; y+=16)
         for (x=0; x<enc->width; x+=16)
             for(i=0; i<4; i++) {
                 tempData->cel_evals[n  ].sourceX = x + (i&1)*8;
                 tempData->cel_evals[n++].sourceY = y + (i&2)*4;
             }

 
     return 0;

 }
 
 /**
  * Get macroblocks from parts of the image
  */

 static void get_frame_mb(const AVFrame *frame, int x, int y, uint8_t mb[], int dim)

 {
     int i, j, cp;
 

     for (cp=0; cp<3; cp++) {
         int stride = frame->linesize[cp];

         for (i=0; i<dim; i++)
             for (j=0; j<dim; j++)
                 *mb++ = frame->data[cp][(y+i)*stride + x + j];

     }

 }
 
 /**
  * Find the codebook with the lowest distortion from an image
  */
 static int index_mb(uint8_t cluster[], uint8_t cb[], int numCB,
                     int *outIndex, int dim)
 {
     int i, lDiff = INT_MAX, pick=0;
 
     /* Diff against the others */
     for (i=0; i<numCB; i++) {
         int diff = squared_diff_macroblock(cluster, cb + i*dim*dim*3, dim);
         if (diff < lDiff) {
             lDiff = diff;
             pick = i;
         }
     }
 
     *outIndex = pick;
     return lDiff;
 }
 
 #define EVAL_MOTION(MOTION) \
     do { \
         diff = eval_motion_dist(enc, j, i, MOTION, blocksize); \
             \
         if (diff < lowestdiff) { \
             lowestdiff = diff; \
             bestpick = MOTION; \
         } \
     } while(0)
 
 static void motion_search(RoqContext *enc, int blocksize)
 {
     static const motion_vect offsets[8] = {
         {{ 0,-1}},
         {{ 0, 1}},
         {{-1, 0}},
         {{ 1, 0}},
         {{-1, 1}},
         {{ 1,-1}},
         {{-1,-1}},
         {{ 1, 1}},
     };
 
     int diff, lowestdiff, oldbest;
     int off[3];
     motion_vect bestpick = {{0,0}};
     int i, j, k, offset;
 
     motion_vect *last_motion;
     motion_vect *this_motion;
     motion_vect vect, vect2;
 
     int max=(enc->width/blocksize)*enc->height/blocksize;
 
     if (blocksize == 4) {
         last_motion = enc->last_motion4;
         this_motion = enc->this_motion4;
     } else {
         last_motion = enc->last_motion8;
         this_motion = enc->this_motion8;
     }
 
     for (i=0; i<enc->height; i+=blocksize)
         for (j=0; j<enc->width; j+=blocksize) {
             lowestdiff = eval_motion_dist(enc, j, i, (motion_vect) {{0,0}},
                                           blocksize);
             bestpick.d[0] = 0;
             bestpick.d[1] = 0;
 
             if (blocksize == 4)
                 EVAL_MOTION(enc->this_motion8[(i/8)*(enc->width/8) + j/8]);
 
             offset = (i/blocksize)*enc->width/blocksize + j/blocksize;
             if (offset < max && offset >= 0)
                 EVAL_MOTION(last_motion[offset]);
 
             offset++;
             if (offset < max && offset >= 0)
                 EVAL_MOTION(last_motion[offset]);
 
             offset = (i/blocksize + 1)*enc->width/blocksize + j/blocksize;
             if (offset < max && offset >= 0)
                 EVAL_MOTION(last_motion[offset]);
 
             off[0]= (i/blocksize)*enc->width/blocksize + j/blocksize - 1;
             off[1]= off[0] - enc->width/blocksize + 1;
             off[2]= off[1] + 1;
 
             if (i) {
 
                 for(k=0; k<2; k++)
                     vect.d[k]= mid_pred(this_motion[off[0]].d[k],
                                         this_motion[off[1]].d[k],
                                         this_motion[off[2]].d[k]);
 
                 EVAL_MOTION(vect);
                 for(k=0; k<3; k++)
                     EVAL_MOTION(this_motion[off[k]]);
             } else if(j)
                 EVAL_MOTION(this_motion[off[0]]);
 
             vect = bestpick;
 
             oldbest = -1;
             while (oldbest != lowestdiff) {
                 oldbest = lowestdiff;
                 for (k=0; k<8; k++) {
                     vect2 = vect;
                     vect2.d[0] += offsets[k].d[0];
                     vect2.d[1] += offsets[k].d[1];
                     EVAL_MOTION(vect2);
                 }
                 vect = bestpick;
             }
             offset = (i/blocksize)*enc->width/blocksize + j/blocksize;
             this_motion[offset] = bestpick;
         }
 }
 
 /**

  * Get distortion for all options available to a subcel

  */

 static void gather_data_for_subcel(SubcelEvaluation *subcel, int x,
                                    int y, RoqContext *enc, RoqTempdata *tempData)

 {
     uint8_t mb4[4*4*3];
     uint8_t mb2[2*2*3];
     int cluster_index;
     int i, best_dist;
 
     static const int bitsUsed[4] = {2, 10, 10, 34};
 
     if (enc->framesSinceKeyframe >= 1) {
         subcel->motion = enc->this_motion4[y*enc->width/16 + x/4];
 
         subcel->eval_dist[RoQ_ID_FCC] =
             eval_motion_dist(enc, x, y,
                              enc->this_motion4[y*enc->width/16 + x/4], 4);
     } else
         subcel->eval_dist[RoQ_ID_FCC] = INT_MAX;
 
     if (enc->framesSinceKeyframe >= 2)
         subcel->eval_dist[RoQ_ID_MOT] = block_sse(enc->frame_to_enc->data,
                                                   enc->current_frame->data, x,

                                                   y, x, y,
                                                   enc->frame_to_enc->linesize,

                                                   enc->current_frame->linesize,

                                                   4);

     else
         subcel->eval_dist[RoQ_ID_MOT] = INT_MAX;
 
     cluster_index = y*enc->width/16 + x/4;
 
     get_frame_mb(enc->frame_to_enc, x, y, mb4, 4);
 
     subcel->eval_dist[RoQ_ID_SLD] = index_mb(mb4,
                                              tempData->codebooks.unpacked_cb4,
                                              tempData->codebooks.numCB4,
                                              &subcel->cbEntry, 4);
 
     subcel->eval_dist[RoQ_ID_CCC] = 0;
 
     for(i=0;i<4;i++) {
         subcel->subCels[i] = tempData->closest_cb2[cluster_index*4+i];
 
         get_frame_mb(enc->frame_to_enc, x+2*(i&1),
                      y+(i&2), mb2, 2);
 
         subcel->eval_dist[RoQ_ID_CCC] +=
             squared_diff_macroblock(tempData->codebooks.unpacked_cb2 + subcel->subCels[i]*2*2*3, mb2, 2);
     }
 
     best_dist = INT_MAX;
     for (i=0; i<4; i++)
         if (ROQ_LAMBDA_SCALE*subcel->eval_dist[i] + enc->lambda*bitsUsed[i] <
             best_dist) {
             subcel->best_coding = i;
             subcel->best_bit_use = bitsUsed[i];
             best_dist = ROQ_LAMBDA_SCALE*subcel->eval_dist[i] +
                 enc->lambda*bitsUsed[i];
         }
 }
 
 /**

  * Get distortion for all options available to a cel

  */

 static void gather_data_for_cel(CelEvaluation *cel, RoqContext *enc,
                                 RoqTempdata *tempData)

 {
     uint8_t mb8[8*8*3];
     int index = cel->sourceY*enc->width/64 + cel->sourceX/8;
     int i, j, best_dist, divide_bit_use;
 
     int bitsUsed[4] = {2, 10, 10, 0};
 
     if (enc->framesSinceKeyframe >= 1) {
         cel->motion = enc->this_motion8[index];
 
         cel->eval_dist[RoQ_ID_FCC] =
             eval_motion_dist(enc, cel->sourceX, cel->sourceY,
                              enc->this_motion8[index], 8);
     } else
         cel->eval_dist[RoQ_ID_FCC] = INT_MAX;
 
     if (enc->framesSinceKeyframe >= 2)
         cel->eval_dist[RoQ_ID_MOT] = block_sse(enc->frame_to_enc->data,
                                                enc->current_frame->data,
                                                cel->sourceX, cel->sourceY,
                                                cel->sourceX, cel->sourceY,

                                                enc->frame_to_enc->linesize,
                                                enc->current_frame->linesize,8);

     else
         cel->eval_dist[RoQ_ID_MOT] = INT_MAX;
 
     get_frame_mb(enc->frame_to_enc, cel->sourceX, cel->sourceY, mb8, 8);
 
     cel->eval_dist[RoQ_ID_SLD] =
         index_mb(mb8, tempData->codebooks.unpacked_cb4_enlarged,
                  tempData->codebooks.numCB4, &cel->cbEntry, 8);
 
     gather_data_for_subcel(cel->subCels + 0, cel->sourceX+0, cel->sourceY+0, enc, tempData);
     gather_data_for_subcel(cel->subCels + 1, cel->sourceX+4, cel->sourceY+0, enc, tempData);
     gather_data_for_subcel(cel->subCels + 2, cel->sourceX+0, cel->sourceY+4, enc, tempData);
     gather_data_for_subcel(cel->subCels + 3, cel->sourceX+4, cel->sourceY+4, enc, tempData);
 
     cel->eval_dist[RoQ_ID_CCC] = 0;
     divide_bit_use = 0;
     for (i=0; i<4; i++) {
         cel->eval_dist[RoQ_ID_CCC] +=
             cel->subCels[i].eval_dist[cel->subCels[i].best_coding];
         divide_bit_use += cel->subCels[i].best_bit_use;
     }
 
     best_dist = INT_MAX;
     bitsUsed[3] = 2 + divide_bit_use;
 
     for (i=0; i<4; i++)
         if (ROQ_LAMBDA_SCALE*cel->eval_dist[i] + enc->lambda*bitsUsed[i] <
             best_dist) {
             cel->best_coding = i;
             best_dist = ROQ_LAMBDA_SCALE*cel->eval_dist[i] +
                 enc->lambda*bitsUsed[i];
         }
 
     tempData->used_option[cel->best_coding]++;
     tempData->mainChunkSize += bitsUsed[cel->best_coding];
 
     if (cel->best_coding == RoQ_ID_SLD)
         tempData->codebooks.usedCB4[cel->cbEntry]++;
 
     if (cel->best_coding == RoQ_ID_CCC)
         for (i=0; i<4; i++) {
             if (cel->subCels[i].best_coding == RoQ_ID_SLD)
                 tempData->codebooks.usedCB4[cel->subCels[i].cbEntry]++;
             else if (cel->subCels[i].best_coding == RoQ_ID_CCC)
                 for (j=0; j<4; j++)
                     tempData->codebooks.usedCB2[cel->subCels[i].subCels[j]]++;
         }
 }
 

 static void remap_codebooks(RoqContext *enc, RoqTempdata *tempData)

 {
     int i, j, idx=0;
 
     /* Make remaps for the final codebook usage */

     for (i=0; i<(enc->quake3_compat ? MAX_CBS_4x4-1 : MAX_CBS_4x4); i++) {

         if (tempData->codebooks.usedCB4[i]) {
             tempData->i2f4[i] = idx;
             tempData->f2i4[idx] = i;
             for (j=0; j<4; j++)
                 tempData->codebooks.usedCB2[enc->cb4x4[i].idx[j]]++;
             idx++;
         }
     }
 
     tempData->numCB4 = idx;
 
     idx = 0;
     for (i=0; i<MAX_CBS_2x2; i++) {
         if (tempData->codebooks.usedCB2[i]) {
             tempData->i2f2[i] = idx;
             tempData->f2i2[idx] = i;
             idx++;
         }
     }
     tempData->numCB2 = idx;
 
 }
 
 /**
  * Write codebook chunk
  */

 static void write_codebooks(RoqContext *enc, RoqTempdata *tempData)

 {
     int i, j;
     uint8_t **outp= &enc->out_buf;
 
     if (tempData->numCB2) {
         bytestream_put_le16(outp, RoQ_QUAD_CODEBOOK);
         bytestream_put_le32(outp, tempData->numCB2*6 + tempData->numCB4*4);
         bytestream_put_byte(outp, tempData->numCB4);
         bytestream_put_byte(outp, tempData->numCB2);
 
         for (i=0; i<tempData->numCB2; i++) {
             bytestream_put_buffer(outp, enc->cb2x2[tempData->f2i2[i]].y, 4);
             bytestream_put_byte(outp, enc->cb2x2[tempData->f2i2[i]].u);
             bytestream_put_byte(outp, enc->cb2x2[tempData->f2i2[i]].v);
         }
 
         for (i=0; i<tempData->numCB4; i++)
             for (j=0; j<4; j++)
                 bytestream_put_byte(outp, tempData->i2f2[enc->cb4x4[tempData->f2i4[i]].idx[j]]);
 
     }
 }
 
 static inline uint8_t motion_arg(motion_vect mot)
 {
     uint8_t ax = 8 - ((uint8_t) mot.d[0]);
     uint8_t ay = 8 - ((uint8_t) mot.d[1]);
     return ((ax&15)<<4) | (ay&15);
 }
 

 typedef struct CodingSpool {

     int typeSpool;
     int typeSpoolLength;
     uint8_t argumentSpool[64];
     uint8_t *args;
     uint8_t **pout;
 } CodingSpool;
 
 /* NOTE: Typecodes must be spooled AFTER arguments!! */
 static void write_typecode(CodingSpool *s, uint8_t type)
 {

     s->typeSpool |= (type & 3) << (14 - s->typeSpoolLength);

     s->typeSpoolLength += 2;
     if (s->typeSpoolLength == 16) {
         bytestream_put_le16(s->pout, s->typeSpool);
         bytestream_put_buffer(s->pout, s->argumentSpool,
                               s->args - s->argumentSpool);
         s->typeSpoolLength = 0;
         s->typeSpool = 0;
         s->args = s->argumentSpool;
     }
 }
 

 static void reconstruct_and_encode_image(RoqContext *enc, RoqTempdata *tempData, int w, int h, int numBlocks)

 {
     int i, j, k;
     int x, y;
     int subX, subY;
     int dist=0;
 
     roq_qcell *qcell;

     CelEvaluation *eval;

 
     CodingSpool spool;
 
     spool.typeSpool=0;
     spool.typeSpoolLength=0;
     spool.args = spool.argumentSpool;
     spool.pout = &enc->out_buf;
 
     if (tempData->used_option[RoQ_ID_CCC]%2)
         tempData->mainChunkSize+=8; //FIXME
 
     /* Write the video chunk header */
     bytestream_put_le16(&enc->out_buf, RoQ_QUAD_VQ);
     bytestream_put_le32(&enc->out_buf, tempData->mainChunkSize/8);
     bytestream_put_byte(&enc->out_buf, 0x0);
     bytestream_put_byte(&enc->out_buf, 0x0);
 
     for (i=0; i<numBlocks; i++) {
         eval = tempData->cel_evals + i;
 
         x = eval->sourceX;
         y = eval->sourceY;
         dist += eval->eval_dist[eval->best_coding];
 
         switch (eval->best_coding) {
         case RoQ_ID_MOT:
             write_typecode(&spool, RoQ_ID_MOT);
             break;
 
         case RoQ_ID_FCC:
             bytestream_put_byte(&spool.args, motion_arg(eval->motion));
 
             write_typecode(&spool, RoQ_ID_FCC);
             ff_apply_motion_8x8(enc, x, y,
                                 eval->motion.d[0], eval->motion.d[1]);
             break;
 
         case RoQ_ID_SLD:
             bytestream_put_byte(&spool.args, tempData->i2f4[eval->cbEntry]);
             write_typecode(&spool, RoQ_ID_SLD);
 
             qcell = enc->cb4x4 + eval->cbEntry;
             ff_apply_vector_4x4(enc, x  , y  , enc->cb2x2 + qcell->idx[0]);
             ff_apply_vector_4x4(enc, x+4, y  , enc->cb2x2 + qcell->idx[1]);
             ff_apply_vector_4x4(enc, x  , y+4, enc->cb2x2 + qcell->idx[2]);
             ff_apply_vector_4x4(enc, x+4, y+4, enc->cb2x2 + qcell->idx[3]);
             break;
 
         case RoQ_ID_CCC:
             write_typecode(&spool, RoQ_ID_CCC);
 
             for (j=0; j<4; j++) {
                 subX = x + 4*(j&1);
                 subY = y + 2*(j&2);
 
                 switch(eval->subCels[j].best_coding) {
                 case RoQ_ID_MOT:
                     break;
 
                 case RoQ_ID_FCC:
                     bytestream_put_byte(&spool.args,
                                         motion_arg(eval->subCels[j].motion));
 
                     ff_apply_motion_4x4(enc, subX, subY,
                                         eval->subCels[j].motion.d[0],
                                         eval->subCels[j].motion.d[1]);
                     break;
 
                 case RoQ_ID_SLD:
                     bytestream_put_byte(&spool.args,
                                         tempData->i2f4[eval->subCels[j].cbEntry]);
 
                     qcell = enc->cb4x4 + eval->subCels[j].cbEntry;
 
                     ff_apply_vector_2x2(enc, subX  , subY  ,
                                         enc->cb2x2 + qcell->idx[0]);
                     ff_apply_vector_2x2(enc, subX+2, subY  ,
                                         enc->cb2x2 + qcell->idx[1]);
                     ff_apply_vector_2x2(enc, subX  , subY+2,
                                         enc->cb2x2 + qcell->idx[2]);
                     ff_apply_vector_2x2(enc, subX+2, subY+2,
                                         enc->cb2x2 + qcell->idx[3]);
                     break;
 
                 case RoQ_ID_CCC:
                     for (k=0; k<4; k++) {
                         int cb_idx = eval->subCels[j].subCels[k];
                         bytestream_put_byte(&spool.args,
                                             tempData->i2f2[cb_idx]);
 
                         ff_apply_vector_2x2(enc, subX + 2*(k&1), subY + (k&2),
                                             enc->cb2x2 + cb_idx);
                     }
                     break;
                 }
                 write_typecode(&spool, eval->subCels[j].best_coding);
             }
             break;
         }
     }
 
     /* Flush the remainder of the argument/type spool */
     while (spool.typeSpoolLength)
         write_typecode(&spool, 0x0);
 }
 
 
 /**
  * Create a single YUV cell from a 2x2 section of the image
  */

 static inline void frame_block_to_cell(uint8_t *block, uint8_t * const *data,
                                        int top, int left, const int *stride)

 {
     int i, j, u=0, v=0;
 
     for (i=0; i<2; i++)
         for (j=0; j<2; j++) {
             int x = (top+i)*stride[0] + left + j;
             *block++ = data[0][x];

             x = (top+i)*stride[1] + left + j;

             u       += data[1][x];
             v       += data[2][x];
         }
 
     *block++ = (u+2)/4;
     *block++ = (v+2)/4;
 }
 
 /**

  * Create YUV clusters for the entire image

  */

 static void create_clusters(const AVFrame *frame, int w, int h, uint8_t *yuvClusters)

 {
     int i, j, k, l;
 
     for (i=0; i<h; i+=4)
         for (j=0; j<w; j+=4) {
             for (k=0; k < 2; k++)
                 for (l=0; l < 2; l++)
                     frame_block_to_cell(yuvClusters + (l + 2*k)*6, frame->data,
                                         i+2*k, j+2*l, frame->linesize);
             yuvClusters += 24;
         }
 }
 

 static int generate_codebook(RoqContext *enc, RoqTempdata *tempdata,
                              int *points, int inputCount, roq_cell *results,
                              int size, int cbsize)

 {

     int i, j, k, ret = 0;

     int c_size = size*size/4;

     int *buf;

     int *codebook = av_malloc_array(6*c_size, cbsize*sizeof(int));

     int *closest_cb;
 

     if (!codebook)
         return AVERROR(ENOMEM);
 
     if (size == 4) {

         closest_cb = av_malloc_array(6*c_size, inputCount*sizeof(int));

         if (!closest_cb) {
             ret = AVERROR(ENOMEM);
             goto out;
         }
     } else

         closest_cb = tempdata->closest_cb2;
 

     ret = avpriv_init_elbg(points, 6 * c_size, inputCount, codebook,

                        cbsize, 1, closest_cb, &enc->randctx);
     if (ret < 0)
         goto out;

     ret = avpriv_do_elbg(points, 6 * c_size, inputCount, codebook,

                      cbsize, 1, closest_cb, &enc->randctx);
     if (ret < 0)
         goto out;

 
     buf = codebook;
     for (i=0; i<cbsize; i++)
         for (k=0; k<c_size; k++) {
             for(j=0; j<4; j++)
                 results->y[j] = *buf++;
 
             results->u =    (*buf++ + CHROMA_BIAS/2)/CHROMA_BIAS;
             results->v =    (*buf++ + CHROMA_BIAS/2)/CHROMA_BIAS;
             results++;
         }

 out:
     if (size == 4)
         av_free(closest_cb);

     av_free(codebook);

     return ret;

 }
 

 static int generate_new_codebooks(RoqContext *enc, RoqTempdata *tempData)

 {

     int i, j, ret = 0;

     RoqCodebooks *codebooks = &tempData->codebooks;

     int max = enc->width*enc->height/16;
     uint8_t mb2[3*4];
     roq_cell *results4 = av_malloc(sizeof(roq_cell)*MAX_CBS_4x4*4);

     uint8_t *yuvClusters=av_malloc_array(max, sizeof(int)*6*4);
     int *points = av_malloc_array(max, 6*4*sizeof(int));

     int bias;
 

     if (!results4 || !yuvClusters || !points) {
         ret = AVERROR(ENOMEM);
         goto out;
     }
 

     /* Subsample YUV data */
     create_clusters(enc->frame_to_enc, enc->width, enc->height, yuvClusters);
 
     /* Cast to integer and apply chroma bias */
     for (i=0; i<max*24; i++) {
         bias = ((i%6)<4) ? 1 : CHROMA_BIAS;
         points[i] = bias*yuvClusters[i];
     }
 
     /* Create 4x4 codebooks */

     if ((ret = generate_codebook(enc, tempData, points, max,

                                  results4, 4, (enc->quake3_compat ? MAX_CBS_4x4-1 : MAX_CBS_4x4))) < 0)

         goto out;

     codebooks->numCB4 = (enc->quake3_compat ? MAX_CBS_4x4-1 : MAX_CBS_4x4);

     tempData->closest_cb2 = av_malloc_array(max, 4*sizeof(int));

     if (!tempData->closest_cb2) {
         ret = AVERROR(ENOMEM);
         goto out;
     }

 
     /* Create 2x2 codebooks */

     if ((ret = generate_codebook(enc, tempData, points, max * 4,
                                  enc->cb2x2, 2, MAX_CBS_2x2)) < 0)
         goto out;

 
     codebooks->numCB2 = MAX_CBS_2x2;
 
     /* Unpack 2x2 codebook clusters */
     for (i=0; i<codebooks->numCB2; i++)
         unpack_roq_cell(enc->cb2x2 + i, codebooks->unpacked_cb2 + i*2*2*3);
 
     /* Index all 4x4 entries to the 2x2 entries, unpack, and enlarge */
     for (i=0; i<codebooks->numCB4; i++) {
         for (j=0; j<4; j++) {
             unpack_roq_cell(&results4[4*i + j], mb2);
             index_mb(mb2, codebooks->unpacked_cb2, codebooks->numCB2,
                      &enc->cb4x4[i].idx[j], 2);
         }
         unpack_roq_qcell(codebooks->unpacked_cb2, enc->cb4x4 + i,
                          codebooks->unpacked_cb4 + i*4*4*3);
         enlarge_roq_mb4(codebooks->unpacked_cb4 + i*4*4*3,
                         codebooks->unpacked_cb4_enlarged + i*8*8*3);
     }

 out:

     av_free(yuvClusters);
     av_free(points);
     av_free(results4);

     return ret;

 }
 

 static int roq_encode_video(RoqContext *enc)

 {

     RoqTempdata *tempData = enc->tmpData;

     int i, ret;

     memset(tempData, 0, sizeof(*tempData));

     ret = create_cel_evals(enc, tempData);
     if (ret < 0)
         return ret;

     ret = generate_new_codebooks(enc, tempData);
     if (ret < 0)
         return ret;

 
     if (enc->framesSinceKeyframe >= 1) {
         motion_search(enc, 8);
         motion_search(enc, 4);
     }
 
  retry_encode:
     for (i=0; i<enc->width*enc->height/64; i++)

         gather_data_for_cel(tempData->cel_evals + i, enc, tempData);

     /* Quake 3 can't handle chunks bigger than 65535 bytes */

     if (tempData->mainChunkSize/8 > 65535 && enc->quake3_compat) {

         if (enc->lambda > 100000) {
             av_log(enc->avctx, AV_LOG_ERROR, "Cannot encode video in Quake compatible form\n");
             return AVERROR(EINVAL);
         }

         av_log(enc->avctx, AV_LOG_ERROR,

                "Warning, generated a frame too big for Quake (%d > 65535), "
                "now switching to a bigger qscale value.\n",

                tempData->mainChunkSize/8);
         enc->lambda *= 1.5;
         tempData->mainChunkSize = 0;
         memset(tempData->used_option, 0, sizeof(tempData->used_option));
         memset(tempData->codebooks.usedCB4, 0,
                sizeof(tempData->codebooks.usedCB4));
         memset(tempData->codebooks.usedCB2, 0,
                sizeof(tempData->codebooks.usedCB2));
 

         goto retry_encode;
     }
 

     remap_codebooks(enc, tempData);

     write_codebooks(enc, tempData);

     reconstruct_and_encode_image(enc, tempData, enc->width, enc->height,

                                  enc->width*enc->height/64);
 
     /* Rotate frame history */
     FFSWAP(AVFrame *, enc->current_frame, enc->last_frame);
     FFSWAP(motion_vect *, enc->last_motion4, enc->this_motion4);
     FFSWAP(motion_vect *, enc->last_motion8, enc->this_motion8);
 

     av_freep(&tempData->cel_evals);
     av_freep(&tempData->closest_cb2);

 
     enc->framesSinceKeyframe++;

 
     return 0;

 }
 

 static av_cold int roq_encode_end(AVCodecContext *avctx)

 {
     RoqContext *enc = avctx->priv_data;
 
     av_frame_free(&enc->current_frame);
     av_frame_free(&enc->last_frame);
 

     av_freep(&enc->tmpData);
     av_freep(&enc->this_motion4);
     av_freep(&enc->last_motion4);
     av_freep(&enc->this_motion8);
     av_freep(&enc->last_motion8);

 
     return 0;
 }
 

 static av_cold int roq_encode_init(AVCodecContext *avctx)

 {
     RoqContext *enc = avctx->priv_data;
 

     av_lfg_init(&enc->randctx, 1);

     enc->avctx = avctx;
 

     enc->framesSinceKeyframe = 0;
     if ((avctx->width & 0xf) || (avctx->height & 0xf)) {
         av_log(avctx, AV_LOG_ERROR, "Dimensions must be divisible by 16\n");

         return AVERROR(EINVAL);

     }
 

     if (avctx->width > 65535 || avctx->height > 65535) {

         av_log(avctx, AV_LOG_ERROR, "Dimensions are max %d\n", enc->quake3_compat ? 32768 : 65535);

         return AVERROR(EINVAL);
     }
 

     if (((avctx->width)&(avctx->width-1))||((avctx->height)&(avctx->height-1)))

         av_log(avctx, AV_LOG_ERROR, "Warning: dimensions not power of two, this is not supported by quake\n");

 
     enc->width = avctx->width;
     enc->height = avctx->height;
 
     enc->framesSinceKeyframe = 0;
     enc->first_frame = 1;
 

     enc->last_frame    = av_frame_alloc();
     enc->current_frame = av_frame_alloc();
     if (!enc->last_frame || !enc->current_frame) {
         roq_encode_end(avctx);
         return AVERROR(ENOMEM);
     }

     enc->tmpData      = av_malloc(sizeof(RoqTempdata));
 

     enc->this_motion4 =

         av_mallocz_array((enc->width*enc->height/16), sizeof(motion_vect));

 
     enc->last_motion4 =

         av_malloc_array ((enc->width*enc->height/16), sizeof(motion_vect));

 
     enc->this_motion8 =

         av_mallocz_array((enc->width*enc->height/64), sizeof(motion_vect));

 
     enc->last_motion8 =

         av_malloc_array ((enc->width*enc->height/64), sizeof(motion_vect));

     if (!enc->tmpData || !enc->this_motion4 || !enc->last_motion4 ||
         !enc->this_motion8 || !enc->last_motion8) {
         roq_encode_end(avctx);
         return AVERROR(ENOMEM);
     }
 

     return 0;
 }
 
 static void roq_write_video_info_chunk(RoqContext *enc)
 {
     /* ROQ info chunk */
     bytestream_put_le16(&enc->out_buf, RoQ_INFO);
 
     /* Size: 8 bytes */
     bytestream_put_le32(&enc->out_buf, 8);
 
     /* Unused argument */
     bytestream_put_byte(&enc->out_buf, 0x00);
     bytestream_put_byte(&enc->out_buf, 0x00);
 
     /* Width */
     bytestream_put_le16(&enc->out_buf, enc->width);
 
     /* Height */
     bytestream_put_le16(&enc->out_buf, enc->height);
 
     /* Unused in Quake 3, mimics the output of the real encoder */
     bytestream_put_byte(&enc->out_buf, 0x08);
     bytestream_put_byte(&enc->out_buf, 0x00);
     bytestream_put_byte(&enc->out_buf, 0x04);
     bytestream_put_byte(&enc->out_buf, 0x00);
 }
 

 static int roq_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                             const AVFrame *frame, int *got_packet)

 {
     RoqContext *enc = avctx->priv_data;

     int size, ret;

 
     enc->avctx = avctx;
 
     enc->frame_to_enc = frame;
 
     if (frame->quality)
         enc->lambda = frame->quality - 1;
     else
         enc->lambda = 2*ROQ_LAMBDA_SCALE;
 
     /* 138 bits max per 8x8 block +
      *     256 codebooks*(6 bytes 2x2 + 4 bytes 4x4) + 8 bytes frame header */

     size = ((enc->width * enc->height / 64) * 138 + 7) / 8 + 256 * (6 + 4) + 8;

     if ((ret = ff_alloc_packet2(avctx, pkt, size, 0)) < 0)

         return ret;
     enc->out_buf = pkt->data;

     /* Check for I-frame */

     if (enc->framesSinceKeyframe == avctx->gop_size)
         enc->framesSinceKeyframe = 0;
 
     if (enc->first_frame) {
         /* Alloc memory for the reconstruction data (we must know the stride
          for that) */

         if ((ret = ff_get_buffer(avctx, enc->current_frame, 0)) < 0 ||
             (ret = ff_get_buffer(avctx, enc->last_frame,    0)) < 0)
             return ret;

 
         /* Before the first video frame, write a "video info" chunk */
         roq_write_video_info_chunk(enc);
 
         enc->first_frame = 0;
     }
 
     /* Encode the actual frame */

     ret = roq_encode_video(enc);
     if (ret < 0)

         return ret;

     pkt->size   = enc->out_buf - pkt->data;
     if (enc->framesSinceKeyframe == 1)
         pkt->flags |= AV_PKT_FLAG_KEY;
     *got_packet = 1;
 
     return 0;

 }
 

 #define OFFSET(x) offsetof(RoqContext, x)
 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
 static const AVOption options[] = {

     { "quake3_compat", "Whether to respect known limitations in Quake 3 decoder", OFFSET(quake3_compat), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, VE },

     { NULL },
 };
 
 static const AVClass roq_class = {
     .class_name = "RoQ",
     .item_name  = av_default_item_name,
     .option     = options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 

 AVCodec ff_roq_encoder = {
     .name                 = "roqvideo",

     .long_name            = NULL_IF_CONFIG_SMALL("id RoQ video"),

     .type                 = AVMEDIA_TYPE_VIDEO,

     .id                   = AV_CODEC_ID_ROQ,

     .priv_data_size       = sizeof(RoqContext),
     .init                 = roq_encode_init,

     .encode2              = roq_encode_frame,

     .close                = roq_encode_end,

     .pix_fmts             = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUVJ444P,

                                                         AV_PIX_FMT_NONE },

     .priv_class     = &roq_class,

 };