449 lines
14 KiB
C
449 lines
14 KiB
C
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/*
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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/common.h"
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "internal.h"
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#include <zlib.h>
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/* Frame header flags */
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#define ZMBV_KEYFRAME 1
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#define ZMBV_DELTAPAL 2
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/* Motion block width/height (maximum allowed value is 255)
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* Note: histogram datatype in block_cmp() must be big enough to hold values
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* up to (4 * ZMBV_BLOCK * ZMBV_BLOCK)
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*/
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#define ZMBV_BLOCK 16
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/* Keyframe header format values */
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enum ZmbvFormat {
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ZMBV_FMT_NONE = 0,
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ZMBV_FMT_1BPP = 1,
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ZMBV_FMT_2BPP = 2,
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ZMBV_FMT_4BPP = 3,
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ZMBV_FMT_8BPP = 4,
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ZMBV_FMT_15BPP = 5,
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ZMBV_FMT_16BPP = 6,
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ZMBV_FMT_24BPP = 7,
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ZMBV_FMT_32BPP = 8
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};
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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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int lrange, urange;
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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, *prev_buf;
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int pstride;
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int comp_size;
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int keyint, curfrm;
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int bypp;
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enum ZmbvFormat fmt;
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z_stream zstream;
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int score_tab[ZMBV_BLOCK * ZMBV_BLOCK * 4 + 1];
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} ZmbvEncContext;
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/** Block comparing function
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* XXX should be optimized and moved to DSPContext
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*/
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static inline int block_cmp(ZmbvEncContext *c, uint8_t *src, int stride,
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uint8_t *src2, int stride2, int bw, int bh,
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int *xored)
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{
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int sum = 0;
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int i, j;
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uint16_t histogram[256] = {0};
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int bw_bytes = bw * c->bypp;
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/* Build frequency histogram of byte values for src[] ^ src2[] */
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for(j = 0; j < bh; j++){
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for(i = 0; i < bw_bytes; i++){
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int t = src[i] ^ src2[i];
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histogram[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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/* If not all the xored values were 0, then the blocks are different */
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*xored = (histogram[0] < bw_bytes * bh);
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/* Exit early if blocks are equal */
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if (!*xored) return 0;
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/* Sum the entropy of all values */
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for(i = 0; i < 256; i++)
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sum += c->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, txored, tv, bv, bw, bh;
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int mx0, my0;
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mx0 = *mx;
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my0 = *my;
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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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/* Try (0,0) */
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bv = block_cmp(c, src, sstride, prev, pstride, bw, bh, xored);
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*mx = *my = 0;
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if(!bv) return 0;
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/* Try previous block's MV (if not 0,0) */
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if (mx0 || my0){
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tv = block_cmp(c, src, sstride, prev + mx0 * c->bypp + my0 * pstride, pstride, bw, bh, &txored);
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if(tv < bv){
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bv = tv;
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*mx = mx0;
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*my = my0;
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*xored = txored;
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if(!bv) return 0;
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}
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}
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/* Try other MVs from top-to-bottom, left-to-right */
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for(dy = -c->lrange; dy <= c->urange; dy++){
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for(dx = -c->lrange; dx <= c->urange; dx++){
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if(!dx && !dy) continue; // we already tested this block
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if(dx == mx0 && dy == my0) continue; // this one too
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tv = block_cmp(c, src, sstride, prev + dx * c->bypp + dy * pstride, pstride, bw, bh, &txored);
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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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*xored = txored;
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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, AVPacket *pkt,
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const AVFrame *pict, int *got_packet)
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{
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ZmbvEncContext * const c = avctx->priv_data;
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const AVFrame * const p = pict;
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uint8_t *src, *prev, *buf;
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uint32_t *palptr;
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int keyframe, chpal;
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int fl;
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int work_size = 0, pkt_size;
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int bw, bh;
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int i, j, ret;
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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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#if FF_API_CODED_FRAME
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FF_DISABLE_DEPRECATION_WARNINGS
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avctx->coded_frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
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avctx->coded_frame->key_frame = keyframe;
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FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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palptr = (avctx->pix_fmt == AV_PIX_FMT_PAL8) ? (uint32_t *)p->data[1] : NULL;
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chpal = !keyframe && palptr && memcmp(palptr, c->pal2, 1024);
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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, palptr, 1024);
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}
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if(keyframe){
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if (palptr){
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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, palptr, 1024);
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work_size = 768;
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}
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for(i = 0; i < avctx->height; i++){
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memcpy(c->work_buf + work_size, src, avctx->width * c->bypp);
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src += p->linesize[0];
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work_size += avctx->width * c->bypp;
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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 = 0, my = 0;
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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 * c->bypp;
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tprev = prev + x * c->bypp;
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zmbv_me(c, tsrc, p->linesize[0], tprev, c->pstride, x, y, &mx, &my, &xored);
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mv[0] = (mx * 2) | !!xored;
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mv[1] = my * 2;
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tprev += mx * c->bypp + 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 * c->bypp; 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 * c->bypp);
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prev += c->pstride;
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src += p->linesize[0];
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}
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if (keyframe)
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deflateReset(&c->zstream);
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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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pkt_size = c->zstream.total_out + 1 + 6*keyframe;
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if ((ret = ff_alloc_packet2(avctx, pkt, pkt_size, 0)) < 0)
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return ret;
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buf = pkt->data;
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fl = (keyframe ? ZMBV_KEYFRAME : 0) | (chpal ? ZMBV_DELTAPAL : 0);
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*buf++ = fl;
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if (keyframe) {
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*buf++ = 0; // hi ver
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*buf++ = 1; // lo ver
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*buf++ = 1; // comp
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*buf++ = c->fmt; // format
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*buf++ = ZMBV_BLOCK; // block width
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*buf++ = ZMBV_BLOCK; // block height
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}
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memcpy(buf, c->comp_buf, c->zstream.total_out);
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pkt->flags |= AV_PKT_FLAG_KEY*keyframe;
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*got_packet = 1;
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return 0;
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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_buf);
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return 0;
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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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int prev_size, prev_offset;
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switch (avctx->pix_fmt) {
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case AV_PIX_FMT_PAL8:
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c->fmt = ZMBV_FMT_8BPP;
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c->bypp = 1;
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break;
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case AV_PIX_FMT_RGB555LE:
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c->fmt = ZMBV_FMT_15BPP;
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c->bypp = 2;
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break;
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case AV_PIX_FMT_RGB565LE:
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c->fmt = ZMBV_FMT_16BPP;
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c->bypp = 2;
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break;
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#ifdef ZMBV_ENABLE_24BPP
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case AV_PIX_FMT_BGR24:
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c->fmt = ZMBV_FMT_24BPP;
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c->bypp = 3;
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break;
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#endif //ZMBV_ENABLE_24BPP
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case AV_PIX_FMT_BGR0:
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c->fmt = ZMBV_FMT_32BPP;
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c->bypp = 4;
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break;
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default:
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av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n");
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return AVERROR(EINVAL);
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|
|
}
|
||
|
|
|
||
|
|
/* Entropy-based score tables for comparing blocks.
|
||
|
|
* Suitable for blocks up to (ZMBV_BLOCK * ZMBV_BLOCK) bytes.
|
||
|
|
* Scores are nonnegative, lower is better.
|
||
|
|
*/
|
||
|
|
for(i = 1; i <= ZMBV_BLOCK * ZMBV_BLOCK * c->bypp; i++)
|
||
|
|
c->score_tab[i] = -i * log2(i / (double)(ZMBV_BLOCK * ZMBV_BLOCK * c->bypp)) * 256;
|
||
|
|
|
||
|
|
c->avctx = avctx;
|
||
|
|
|
||
|
|
c->curfrm = 0;
|
||
|
|
c->keyint = avctx->keyint_min;
|
||
|
|
|
||
|
|
/* Motion estimation range: maximum distance is -64..63 */
|
||
|
|
c->lrange = c->urange = 8;
|
||
|
|
if(avctx->me_range > 0){
|
||
|
|
c->lrange = FFMIN(avctx->me_range, 64);
|
||
|
|
c->urange = FFMIN(avctx->me_range, 63);
|
||
|
|
}
|
||
|
|
|
||
|
|
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 * c->bypp * 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))) {
|
||
|
|
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))) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Allocate prev buffer - pad around the image to allow out-of-edge ME:
|
||
|
|
* - The image should be padded with `lrange` rows before and `urange` rows
|
||
|
|
* after.
|
||
|
|
* - The stride should be padded with `lrange` pixels, then rounded up to a
|
||
|
|
* multiple of 16 bytes.
|
||
|
|
* - The first row should also be padded with `lrange` pixels before, then
|
||
|
|
* aligned up to a multiple of 16 bytes.
|
||
|
|
*/
|
||
|
|
c->pstride = FFALIGN((avctx->width + c->lrange) * c->bypp, 16);
|
||
|
|
prev_size = FFALIGN(c->lrange * c->bypp, 16) + c->pstride * (c->lrange + avctx->height + c->urange);
|
||
|
|
prev_offset = FFALIGN(c->lrange * c->bypp, 16) + c->pstride * c->lrange;
|
||
|
|
if (!(c->prev_buf = av_mallocz(prev_size))) {
|
||
|
|
av_log(avctx, AV_LOG_ERROR, "Can't allocate picture.\n");
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
}
|
||
|
|
c->prev = c->prev_buf + prev_offset;
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
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_RGB555LE,
|
||
|
|
AV_PIX_FMT_RGB565LE,
|
||
|
|
#ifdef ZMBV_ENABLE_24BPP
|
||
|
|
AV_PIX_FMT_BGR24,
|
||
|
|
#endif //ZMBV_ENABLE_24BPP
|
||
|
|
AV_PIX_FMT_BGR0,
|
||
|
|
AV_PIX_FMT_NONE },
|
||
|
|
};
|