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/*

 * Zip Motion Blocks Video (ZMBV) encoder

 * Copyright (c) 2006 Konstantin Shishkov

 *

 * 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

 * Zip Motion Blocks Video encoder

 */

#include 

#include 

#include "libavutil/common.h"

#include "libavutil/intreadwrite.h"

#include "avcodec.h"

#include "internal.h"

#include 

#define ZMBV_KEYFRAME 1

#define ZMBV_DELTAPAL 2

#define ZMBV_BLOCK 16

/**

 * Encoder context

 */

typedef struct ZmbvEncContext {

    AVCodecContext *avctx;

    int range;

    uint8_t *comp_buf, *work_buf;

    uint8_t pal[768];

    uint32_t pal2[256]; //for quick comparisons

    uint8_t *prev;

    int pstride;

    int comp_size;

    int keyint, curfrm;

    z_stream zstream;

} ZmbvEncContext;

static int score_tab[256];

/** Block comparing function

 * XXX should be optimized and moved to DSPContext

 * TODO handle out of edge ME

 */

static inline int block_cmp(uint8_t *src, int stride, uint8_t *src2, int stride2,

                            int bw, int bh, int *xored)

{

    int sum = 0;

    int i, j;

    uint8_t histogram[256] = {0};

    *xored = 0;

    for(j = 0; j < bh; j++){

        for(i = 0; i < bw; i++){

            int t = src[i] ^ src2[i];

            histogram[t]++;

            *xored |= t;

        }

        src += stride;

        src2 += stride2;

    }

    for(i = 1; i < 256; i++)

        sum += score_tab[histogram[i]];

    return sum;

}

/** Motion estimation function

 * TODO make better ME decisions

 */

static int zmbv_me(ZmbvEncContext *c, uint8_t *src, int sstride, uint8_t *prev,

                   int pstride, int x, int y, int *mx, int *my, int *xored)

{

    int dx, dy, tx, ty, tv, bv, bw, bh;

    *mx = *my = 0;

    bw = FFMIN(ZMBV_BLOCK, c->avctx->width - x);

    bh = FFMIN(ZMBV_BLOCK, c->avctx->height - y);

    bv = block_cmp(src, sstride, prev, pstride, bw, bh, xored);

    if(!bv) return 0;

    for(ty = FFMAX(y - c->range, 0); ty < FFMIN(y + c->range, c->avctx->height - bh); ty++){

        for(tx = FFMAX(x - c->range, 0); tx < FFMIN(x + c->range, c->avctx->width - bw); tx++){

            if(tx == x && ty == y) continue; // we already tested this block

            dx = tx - x;

            dy = ty - y;

            tv = block_cmp(src, sstride, prev + dx + dy*pstride, pstride, bw, bh, xored);

            if(tv < bv){

                 bv = tv;

                 *mx = dx;

                 *my = dy;

                 if(!bv) return 0;

             }

         }

    }

    return bv;

}

static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,

                        const AVFrame *pict, int *got_packet)

{

    ZmbvEncContext * const c = avctx->priv_data;

    AVFrame * const p = (AVFrame *)pict;

    uint8_t *src, *prev, *buf;

    uint32_t *palptr;

    int keyframe, chpal;

    int fl;

    int work_size = 0, pkt_size;

    int bw, bh;

    int i, j, ret;

    keyframe = !c->curfrm;

    c->curfrm++;

    if(c->curfrm == c->keyint)

        c->curfrm = 0;

    p->pict_type= keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;

    p->key_frame= keyframe;

    chpal = !keyframe && memcmp(p->data[1], c->pal2, 1024);

    palptr = (uint32_t*)p->data[1];

    src = p->data[0];

    prev = c->prev;

    if(chpal){

        uint8_t tpal[3];

        for(i = 0; i < 256; i++){

            AV_WB24(tpal, palptr[i]);

            c->work_buf[work_size++] = tpal[0] ^ c->pal[i * 3 + 0];

            c->work_buf[work_size++] = tpal[1] ^ c->pal[i * 3 + 1];

            c->work_buf[work_size++] = tpal[2] ^ c->pal[i * 3 + 2];

            c->pal[i * 3 + 0] = tpal[0];

            c->pal[i * 3 + 1] = tpal[1];

            c->pal[i * 3 + 2] = tpal[2];

        }

        memcpy(c->pal2, p->data[1], 1024);

    }

    if(keyframe){

        for(i = 0; i < 256; i++){

            AV_WB24(c->pal+(i*3), palptr[i]);

        }

        memcpy(c->work_buf, c->pal, 768);

        memcpy(c->pal2, p->data[1], 1024);

        work_size = 768;

        for(i = 0; i < avctx->height; i++){

            memcpy(c->work_buf + work_size, src, avctx->width);

            src += p->linesize[0];

            work_size += avctx->width;

        }

    }else{

        int x, y, bh2, bw2, xored;

        uint8_t *tsrc, *tprev;

        uint8_t *mv;

        int mx, my;

        bw = (avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK;

        bh = (avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK;

        mv = c->work_buf + work_size;

        memset(c->work_buf + work_size, 0, (bw * bh * 2 + 3) & ~3);

        work_size += (bw * bh * 2 + 3) & ~3;

        /* for now just XOR'ing */

        for(y = 0; y < avctx->height; y += ZMBV_BLOCK) {

            bh2 = FFMIN(avctx->height - y, ZMBV_BLOCK);

            for(x = 0; x < avctx->width; x += ZMBV_BLOCK, mv += 2) {

                bw2 = FFMIN(avctx->width - x, ZMBV_BLOCK);

                tsrc = src + x;

                tprev = prev + x;

                zmbv_me(c, tsrc, p->linesize[0], tprev, c->pstride, x, y, &mx, &my, &xored);

                mv[0] = (mx << 1) | !!xored;

                mv[1] = my << 1;

                tprev += mx + my * c->pstride;

                if(xored){

                    for(j = 0; j < bh2; j++){

                        for(i = 0; i < bw2; i++)

                            c->work_buf[work_size++] = tsrc[i] ^ tprev[i];

                        tsrc += p->linesize[0];

                        tprev += c->pstride;

                    }

                }

            }

            src += p->linesize[0] * ZMBV_BLOCK;

            prev += c->pstride * ZMBV_BLOCK;

        }

    }

    /* save the previous frame */

    src = p->data[0];

    prev = c->prev;

    for(i = 0; i < avctx->height; i++){

        memcpy(prev, src, avctx->width);

        prev += c->pstride;

        src += p->linesize[0];

    }

    if (keyframe)

        deflateReset(&c->zstream);

    c->zstream.next_in = c->work_buf;

    c->zstream.avail_in = work_size;

    c->zstream.total_in = 0;

    c->zstream.next_out = c->comp_buf;

    c->zstream.avail_out = c->comp_size;

    c->zstream.total_out = 0;

    if(deflate(&c->zstream, Z_SYNC_FLUSH) != Z_OK){

        av_log(avctx, AV_LOG_ERROR, "Error compressing data\n");

        return -1;

    }

    pkt_size = c->zstream.total_out + 1 + 6*keyframe;

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

        return ret;

    buf = pkt->data;

    fl = (keyframe ? ZMBV_KEYFRAME : 0) | (chpal ? ZMBV_DELTAPAL : 0);

    *buf++ = fl;

    if (keyframe) {

        *buf++ = 0; // hi ver

        *buf++ = 1; // lo ver

        *buf++ = 1; // comp

        *buf++ = 4; // format - 8bpp

        *buf++ = ZMBV_BLOCK; // block width

        *buf++ = ZMBV_BLOCK; // block height

    }

    memcpy(buf, c->comp_buf, c->zstream.total_out);

    pkt->flags |= AV_PKT_FLAG_KEY*keyframe;

    *got_packet = 1;

    return 0;

}

/**

 * Init zmbv encoder

 */

static av_cold int encode_init(AVCodecContext *avctx)

{

    ZmbvEncContext * const c = avctx->priv_data;

    int zret; // Zlib return code

    int i;

    int lvl = 9;

    for(i=1; i<256; i++)

        score_tab[i]= -i * log(i/(double)(ZMBV_BLOCK*ZMBV_BLOCK)) * (256/M_LN2);

    c->avctx = avctx;

    c->curfrm = 0;

    c->keyint = avctx->keyint_min;

    c->range = 8;

    if(avctx->me_range > 0)

        c->range = FFMIN(avctx->me_range, 127);

    if(avctx->compression_level >= 0)

        lvl = avctx->compression_level;

    if(lvl < 0 || lvl > 9){

        av_log(avctx, AV_LOG_ERROR, "Compression level should be 0-9, not %i\n", lvl);

        return AVERROR(EINVAL);

    }

    // Needed if zlib unused or init aborted before deflateInit

    memset(&c->zstream, 0, sizeof(z_stream));

    c->comp_size = avctx->width * avctx->height + 1024 +

        ((avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * ((avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * 2 + 4;

    if ((c->work_buf = av_malloc(c->comp_size)) == NULL) {

        av_log(avctx, AV_LOG_ERROR, "Can't allocate work buffer.\n");

        return AVERROR(ENOMEM);

    }

    /* Conservative upper bound taken from zlib v1.2.1 source via lcl.c */

    c->comp_size = c->comp_size + ((c->comp_size + 7) >> 3) +

                           ((c->comp_size + 63) >> 6) + 11;

    /* Allocate compression buffer */

    if ((c->comp_buf = av_malloc(c->comp_size)) == NULL) {

        av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");

        return AVERROR(ENOMEM);

    }

    c->pstride = FFALIGN(avctx->width, 16);

    if ((c->prev = av_malloc(c->pstride * avctx->height)) == NULL) {

        av_log(avctx, AV_LOG_ERROR, "Can't allocate picture.\n");

        return AVERROR(ENOMEM);

    }

    c->zstream.zalloc = Z_NULL;

    c->zstream.zfree = Z_NULL;

    c->zstream.opaque = Z_NULL;

    zret = deflateInit(&c->zstream, lvl);

    if (zret != Z_OK) {

        av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);

        return -1;

    }

    return 0;

}

/**

 * Uninit zmbv encoder

 */

static av_cold int encode_end(AVCodecContext *avctx)

{

    ZmbvEncContext * const c = avctx->priv_data;

    av_freep(&c->comp_buf);

    av_freep(&c->work_buf);

    deflateEnd(&c->zstream);

    av_freep(&c->prev);

    return 0;

}

AVCodec ff_zmbv_encoder = {

    .name           = "zmbv",

    .long_name      = NULL_IF_CONFIG_SMALL("Zip Motion Blocks Video"),

    .type           = AVMEDIA_TYPE_VIDEO,

    .id             = AV_CODEC_ID_ZMBV,

    .priv_data_size = sizeof(ZmbvEncContext),

    .init           = encode_init,

    .encode2        = encode_frame,

    .close          = encode_end,

    .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_PAL8, AV_PIX_FMT_NONE },

};