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/*

 * RoQ Video Encoder.

 *

 * Copyright (C) 2007 Vitor Sessak 

 * 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 

#include "libavutil/attributes.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 255

#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

            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

{

    int eval_dist[4];

    int best_bit_use;

    int best_coding;

    int subCels[4];

    motion_vect motion;

    int cbEntry;

} SubcelEvaluation;

typedef struct

{

    int eval_dist[4];

    int best_coding;

    SubcelEvaluation subCels[4];

    motion_vect motion;

    int cbEntry;

    int sourceX, sourceY;

} CelEvaluation;

typedef struct

{

    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 void create_cel_evals(RoqContext *enc, RoqTempdata *tempData)

{

    int n=0, x, y, i;

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

    /* Map to the ROQ quadtree order */

    for (y=0; yheight; y+=16)

        for (x=0; xwidth; 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;

            }

}

/**

 * 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

            for (j=0; 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

        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; iheight; i+=blocksize)

        for (j=0; jwidth; 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

        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

        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; inumCB2; 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; inumCB4; 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

{

    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

        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);

#if 0

    uint8_t *fdata[3] = {enc->frame_to_enc->data[0],

                           enc->frame_to_enc->data[1],

                           enc->frame_to_enc->data[2]};

    uint8_t *cdata[3] = {enc->current_frame->data[0],

                           enc->current_frame->data[1],

                           enc->current_frame->data[2]};

    av_log(enc->avctx, AV_LOG_ERROR, "Expected distortion: %i Actual: %i\n",

           dist,

           block_sse(fdata, cdata, 0, 0, 0, 0,

                     enc->frame_to_enc->linesize,

                     enc->current_frame->linesize,

                     enc->width));  //WARNING: Square dimensions implied...

#endif

}

/**

 * 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

        for (j=0; j

            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 void generate_codebook(RoqContext *enc, RoqTempdata *tempdata,

                              int *points, int inputCount, roq_cell *results,

                              int size, int cbsize)

{

    int i, j, k;

    int c_size = size*size/4;

    int *buf;

    int *codebook = av_malloc(6*c_size*cbsize*sizeof(int));

    int *closest_cb;

    if (size == 4)

        closest_cb = av_malloc(6*c_size*inputCount*sizeof(int));

    else

        closest_cb = tempdata->closest_cb2;

    ff_init_elbg(points, 6*c_size, inputCount, codebook, cbsize, 1, closest_cb, &enc->randctx);

    ff_do_elbg(points, 6*c_size, inputCount, codebook, cbsize, 1, closest_cb, &enc->randctx);

    if (size == 4)

        av_free(closest_cb);

    buf = codebook;

    for (i=0; i

        for (k=0; 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++;

        }

    av_free(codebook);

}

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

{

    int i,j;

    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(sizeof(int)*max*6*4);

    int *points = av_malloc(max*6*4*sizeof(int));

    int bias;

    /* 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

        bias = ((i%6)<4) ? 1 : CHROMA_BIAS;

        points[i] = bias*yuvClusters[i];

    }

    /* Create 4x4 codebooks */

    generate_codebook(enc, tempData, points, max, results4, 4, MAX_CBS_4x4);

    codebooks->numCB4 = MAX_CBS_4x4;

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

    /* Create 2x2 codebooks */

    generate_codebook(enc, tempData, points, max*4, enc->cb2x2, 2, MAX_CBS_2x2);

    codebooks->numCB2 = MAX_CBS_2x2;

    /* Unpack 2x2 codebook clusters */

    for (i=0; inumCB2; 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; inumCB4; 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);

    }

    av_free(yuvClusters);

    av_free(points);

    av_free(results4);

}

static void roq_encode_video(RoqContext *enc)

{

    RoqTempdata *tempData = enc->tmpData;

    int i;

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

    create_cel_evals(enc, tempData);

    generate_new_codebooks(enc, tempData);

    if (enc->framesSinceKeyframe >= 1) {

        motion_search(enc, 8);

        motion_search(enc, 4);

    }

 retry_encode:

    for (i=0; iwidth*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) {

        av_log(enc->avctx, AV_LOG_ERROR,

               "Warning, generated a frame too big (%d > 65535), "

               "try using a smaller 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);

    enc->avctx->coded_frame = enc->current_frame;

    /* 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_free(tempData->cel_evals);

    av_free(tempData->closest_cb2);

    enc->framesSinceKeyframe++;

}

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_free(enc->tmpData);

    av_free(enc->this_motion4);

    av_free(enc->last_motion4);

    av_free(enc->this_motion8);

    av_free(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->framesSinceKeyframe = 0;

    if ((avctx->width & 0xf) || (avctx->height & 0xf)) {

        av_log(avctx, AV_LOG_ERROR, "Dimensions must be divisible by 16\n");

        return -1;

    }

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

        av_log(avctx, AV_LOG_ERROR, "Warning: dimensions not power of two\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((enc->width*enc->height/16)*sizeof(motion_vect));

    enc->last_motion4 =

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

    enc->this_motion8 =

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

    enc->last_motion8 =

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

    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)

        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 */

    roq_encode_video(enc);

    pkt->size   = enc->out_buf - pkt->data;

    if (enc->framesSinceKeyframe == 1)

        pkt->flags |= AV_PKT_FLAG_KEY;

    *got_packet = 1;

    return 0;

}

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,

    .supported_framerates = (const AVRational[]){ {30,1}, {0,0} },

    .pix_fmts             = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV444P,

                                                        AV_PIX_FMT_NONE },

};