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https://github.com/FFmpeg/FFmpeg.git
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337 lines
9.7 KiB
C
337 lines
9.7 KiB
C
/*
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* Zip Motion Blocks Video (ZMBV) encoder
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* Copyright (c) 2006 Konstantin Shishkov
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Zip Motion Blocks Video encoder
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include <zlib.h>
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#define ZMBV_KEYFRAME 1
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#define ZMBV_DELTAPAL 2
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#define ZMBV_BLOCK 16
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/**
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* Encoder context
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*/
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typedef struct ZmbvEncContext {
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AVCodecContext *avctx;
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AVFrame pic;
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int range;
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uint8_t *comp_buf, *work_buf;
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uint8_t pal[768];
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uint32_t pal2[256]; //for quick comparisons
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uint8_t *prev;
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int pstride;
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int comp_size;
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int keyint, curfrm;
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z_stream zstream;
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} ZmbvEncContext;
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static int score_tab[256];
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/** Block comparing function
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* XXX should be optimized and moved to DSPContext
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* TODO handle out of edge ME
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*/
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static inline int block_cmp(uint8_t *src, int stride, uint8_t *src2, int stride2,
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int bw, int bh, int *xored)
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{
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int sum = 0;
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int i, j;
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uint8_t histogram[256] = {0};
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*xored = 0;
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for(j = 0; j < bh; j++){
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for(i = 0; i < bw; i++){
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int t = src[i] ^ src2[i];
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histogram[t]++;
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*xored |= t;
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}
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src += stride;
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src2 += stride2;
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}
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for(i = 1; i < 256; i++)
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sum += score_tab[histogram[i]];
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return sum;
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}
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/** Motion estimation function
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* TODO make better ME decisions
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*/
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static int zmbv_me(ZmbvEncContext *c, uint8_t *src, int sstride, uint8_t *prev,
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int pstride, int x, int y, int *mx, int *my, int *xored)
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{
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int dx, dy, tx, ty, tv, bv, bw, bh;
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*mx = *my = 0;
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bw = FFMIN(ZMBV_BLOCK, c->avctx->width - x);
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bh = FFMIN(ZMBV_BLOCK, c->avctx->height - y);
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bv = block_cmp(src, sstride, prev, pstride, bw, bh, xored);
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if(!bv) return 0;
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for(ty = FFMAX(y - c->range, 0); ty < FFMIN(y + c->range, c->avctx->height - bh); ty++){
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for(tx = FFMAX(x - c->range, 0); tx < FFMIN(x + c->range, c->avctx->width - bw); tx++){
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if(tx == x && ty == y) continue; // we already tested this block
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dx = tx - x;
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dy = ty - y;
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tv = block_cmp(src, sstride, prev + dx + dy*pstride, pstride, bw, bh, xored);
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if(tv < bv){
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bv = tv;
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*mx = dx;
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*my = dy;
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if(!bv) return 0;
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}
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}
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}
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return bv;
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}
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static int encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_size, void *data)
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{
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ZmbvEncContext * const c = avctx->priv_data;
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AVFrame *pict = data;
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AVFrame * const p = &c->pic;
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uint8_t *src, *prev;
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uint32_t *palptr;
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int len = 0;
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int keyframe, chpal;
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int fl;
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int work_size = 0;
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int bw, bh;
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int i, j;
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keyframe = !c->curfrm;
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c->curfrm++;
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if(c->curfrm == c->keyint)
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c->curfrm = 0;
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*p = *pict;
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p->pict_type= keyframe ? FF_I_TYPE : FF_P_TYPE;
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p->key_frame= keyframe;
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chpal = !keyframe && memcmp(p->data[1], c->pal2, 1024);
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fl = (keyframe ? ZMBV_KEYFRAME : 0) | (chpal ? ZMBV_DELTAPAL : 0);
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*buf++ = fl; len++;
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if(keyframe){
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deflateReset(&c->zstream);
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*buf++ = 0; len++; // hi ver
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*buf++ = 1; len++; // lo ver
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*buf++ = 1; len++; // comp
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*buf++ = 4; len++; // format - 8bpp
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*buf++ = ZMBV_BLOCK; len++; // block width
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*buf++ = ZMBV_BLOCK; len++; // block height
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}
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palptr = (uint32_t*)p->data[1];
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src = p->data[0];
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prev = c->prev;
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if(chpal){
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uint8_t tpal[3];
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for(i = 0; i < 256; i++){
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AV_WB24(tpal, palptr[i]);
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c->work_buf[work_size++] = tpal[0] ^ c->pal[i * 3 + 0];
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c->work_buf[work_size++] = tpal[1] ^ c->pal[i * 3 + 1];
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c->work_buf[work_size++] = tpal[2] ^ c->pal[i * 3 + 2];
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c->pal[i * 3 + 0] = tpal[0];
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c->pal[i * 3 + 1] = tpal[1];
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c->pal[i * 3 + 2] = tpal[2];
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}
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memcpy(c->pal2, p->data[1], 1024);
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}
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if(keyframe){
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for(i = 0; i < 256; i++){
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AV_WB24(c->pal+(i*3), palptr[i]);
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}
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memcpy(c->work_buf, c->pal, 768);
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memcpy(c->pal2, p->data[1], 1024);
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work_size = 768;
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for(i = 0; i < avctx->height; i++){
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memcpy(c->work_buf + work_size, src, avctx->width);
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src += p->linesize[0];
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work_size += avctx->width;
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}
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}else{
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int x, y, bh2, bw2, xored;
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uint8_t *tsrc, *tprev;
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uint8_t *mv;
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int mx, my, bv;
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bw = (avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK;
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bh = (avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK;
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mv = c->work_buf + work_size;
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memset(c->work_buf + work_size, 0, (bw * bh * 2 + 3) & ~3);
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work_size += (bw * bh * 2 + 3) & ~3;
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/* for now just XOR'ing */
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for(y = 0; y < avctx->height; y += ZMBV_BLOCK) {
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bh2 = FFMIN(avctx->height - y, ZMBV_BLOCK);
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for(x = 0; x < avctx->width; x += ZMBV_BLOCK, mv += 2) {
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bw2 = FFMIN(avctx->width - x, ZMBV_BLOCK);
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tsrc = src + x;
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tprev = prev + x;
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bv = zmbv_me(c, tsrc, p->linesize[0], tprev, c->pstride, x, y, &mx, &my, &xored);
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mv[0] = (mx << 1) | !!xored;
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mv[1] = my << 1;
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tprev += mx + my * c->pstride;
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if(xored){
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for(j = 0; j < bh2; j++){
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for(i = 0; i < bw2; i++)
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c->work_buf[work_size++] = tsrc[i] ^ tprev[i];
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tsrc += p->linesize[0];
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tprev += c->pstride;
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}
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}
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}
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src += p->linesize[0] * ZMBV_BLOCK;
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prev += c->pstride * ZMBV_BLOCK;
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}
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}
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/* save the previous frame */
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src = p->data[0];
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prev = c->prev;
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for(i = 0; i < avctx->height; i++){
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memcpy(prev, src, avctx->width);
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prev += c->pstride;
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src += p->linesize[0];
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}
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c->zstream.next_in = c->work_buf;
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c->zstream.avail_in = work_size;
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c->zstream.total_in = 0;
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c->zstream.next_out = c->comp_buf;
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c->zstream.avail_out = c->comp_size;
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c->zstream.total_out = 0;
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if(deflate(&c->zstream, Z_SYNC_FLUSH) != Z_OK){
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av_log(avctx, AV_LOG_ERROR, "Error compressing data\n");
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return -1;
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}
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memcpy(buf, c->comp_buf, c->zstream.total_out);
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return len + c->zstream.total_out;
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}
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/**
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* Init zmbv encoder
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*/
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static av_cold int encode_init(AVCodecContext *avctx)
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{
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ZmbvEncContext * const c = avctx->priv_data;
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int zret; // Zlib return code
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int i;
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int lvl = 9;
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for(i=1; i<256; i++)
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score_tab[i]= -i * log(i/(double)(ZMBV_BLOCK*ZMBV_BLOCK)) * (256/M_LN2);
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c->avctx = avctx;
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c->curfrm = 0;
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c->keyint = avctx->keyint_min;
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c->range = 8;
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if(avctx->me_range > 0)
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c->range = FFMIN(avctx->me_range, 127);
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if(avctx->compression_level >= 0)
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lvl = avctx->compression_level;
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if(lvl < 0 || lvl > 9){
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av_log(avctx, AV_LOG_ERROR, "Compression level should be 0-9, not %i\n", lvl);
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return -1;
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}
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// Needed if zlib unused or init aborted before deflateInit
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memset(&(c->zstream), 0, sizeof(z_stream));
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c->comp_size = avctx->width * avctx->height + 1024 +
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((avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * ((avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * 2 + 4;
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if ((c->work_buf = av_malloc(c->comp_size)) == NULL) {
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av_log(avctx, AV_LOG_ERROR, "Can't allocate work buffer.\n");
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return -1;
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}
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/* Conservative upper bound taken from zlib v1.2.1 source via lcl.c */
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c->comp_size = c->comp_size + ((c->comp_size + 7) >> 3) +
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((c->comp_size + 63) >> 6) + 11;
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/* Allocate compression buffer */
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if ((c->comp_buf = av_malloc(c->comp_size)) == NULL) {
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av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
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return -1;
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}
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c->pstride = FFALIGN(avctx->width, 16);
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if ((c->prev = av_malloc(c->pstride * avctx->height)) == NULL) {
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av_log(avctx, AV_LOG_ERROR, "Can't allocate picture.\n");
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return -1;
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}
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c->zstream.zalloc = Z_NULL;
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c->zstream.zfree = Z_NULL;
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c->zstream.opaque = Z_NULL;
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zret = deflateInit(&(c->zstream), lvl);
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if (zret != Z_OK) {
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av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
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return -1;
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}
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avctx->coded_frame = (AVFrame*)&c->pic;
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return 0;
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}
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/**
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* Uninit zmbv encoder
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*/
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static av_cold int encode_end(AVCodecContext *avctx)
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{
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ZmbvEncContext * const c = avctx->priv_data;
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av_freep(&c->comp_buf);
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av_freep(&c->work_buf);
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deflateEnd(&(c->zstream));
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av_freep(&c->prev);
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return 0;
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}
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AVCodec ff_zmbv_encoder = {
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"zmbv",
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AVMEDIA_TYPE_VIDEO,
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CODEC_ID_ZMBV,
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sizeof(ZmbvEncContext),
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encode_init,
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encode_frame,
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encode_end,
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.pix_fmts = (const enum PixelFormat[]){PIX_FMT_PAL8, PIX_FMT_NONE},
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.long_name = NULL_IF_CONFIG_SMALL("Zip Motion Blocks Video"),
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};
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