FFmpeg/libavcodec/zmbvenc.c
Stefano Sabatini 72415b2adb Define AVMediaType enum, and use it instead of enum CodecType, which
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-30 23:30:55 +00:00

337 lines
9.7 KiB
C

/*
* 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 libavcodec/zmbvenc.c
* Zip Motion Blocks Video encoder
*/
#include <stdio.h>
#include <stdlib.h>
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include <zlib.h>
#define ZMBV_KEYFRAME 1
#define ZMBV_DELTAPAL 2
#define ZMBV_BLOCK 16
/**
* Encoder context
*/
typedef struct ZmbvEncContext {
AVCodecContext *avctx;
AVFrame pic;
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, uint8_t *buf, int buf_size, void *data)
{
ZmbvEncContext * const c = avctx->priv_data;
AVFrame *pict = data;
AVFrame * const p = &c->pic;
uint8_t *src, *prev;
uint32_t *palptr;
int len = 0;
int keyframe, chpal;
int fl;
int work_size = 0;
int bw, bh;
int i, j;
keyframe = !c->curfrm;
c->curfrm++;
if(c->curfrm == c->keyint)
c->curfrm = 0;
*p = *pict;
p->pict_type= keyframe ? FF_I_TYPE : FF_P_TYPE;
p->key_frame= keyframe;
chpal = !keyframe && memcmp(p->data[1], c->pal2, 1024);
fl = (keyframe ? ZMBV_KEYFRAME : 0) | (chpal ? ZMBV_DELTAPAL : 0);
*buf++ = fl; len++;
if(keyframe){
deflateReset(&c->zstream);
*buf++ = 0; len++; // hi ver
*buf++ = 1; len++; // lo ver
*buf++ = 1; len++; // comp
*buf++ = 4; len++; // format - 8bpp
*buf++ = ZMBV_BLOCK; len++; // block width
*buf++ = ZMBV_BLOCK; len++; // block height
}
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, bv;
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;
bv = 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];
}
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;
}
memcpy(buf, c->comp_buf, c->zstream.total_out);
return len + c->zstream.total_out;
}
/**
* 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 -1;
}
// 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 -1;
}
/* 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 -1;
}
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 -1;
}
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;
}
avctx->coded_frame = (AVFrame*)&c->pic;
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 zmbv_encoder = {
"zmbv",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_ZMBV,
sizeof(ZmbvEncContext),
encode_init,
encode_frame,
encode_end,
.pix_fmts = (const enum PixelFormat[]){PIX_FMT_PAL8, PIX_FMT_NONE},
.long_name = NULL_IF_CONFIG_SMALL("Zip Motion Blocks Video"),
};