2 * Zip Motion Blocks Video (ZMBV) encoder
3 * Copyright (c) 2006 Konstantin Shishkov
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 * @file libavcodec/zmbvenc.c
24 * Zip Motion Blocks Video encoder
30 #include "libavutil/intreadwrite.h"
35 #define ZMBV_KEYFRAME 1
36 #define ZMBV_DELTAPAL 2
43 typedef struct ZmbvEncContext {
44 AVCodecContext *avctx;
48 uint8_t *comp_buf, *work_buf;
50 uint32_t pal2[256]; //for quick comparisons
58 static int score_tab[256];
60 /** Block comparing function
61 * XXX should be optimized and moved to DSPContext
62 * TODO handle out of edge ME
64 static inline int block_cmp(uint8_t *src, int stride, uint8_t *src2, int stride2, int bw, int bh)
68 uint8_t histogram[256]={0};
70 for(j = 0; j < bh; j++){
71 for(i = 0; i < bw; i++)
72 histogram[src[i] ^ src2[i]]++;
78 sum+= score_tab[histogram[i]];
83 /** Motion estimation function
84 * TODO make better ME decisions
86 static int zmbv_me(ZmbvEncContext *c, uint8_t *src, int sstride, uint8_t *prev, int pstride,
87 int x, int y, int *mx, int *my)
89 int dx, dy, tx, ty, tv, bv, bw, bh;
92 bw = FFMIN(ZMBV_BLOCK, c->avctx->width - x);
93 bh = FFMIN(ZMBV_BLOCK, c->avctx->height - y);
94 bv = block_cmp(src, sstride, prev, pstride, bw, bh);
96 for(ty = FFMAX(y - c->range, 0); ty < FFMIN(y + c->range, c->avctx->height - bh); ty++){
97 for(tx = FFMAX(x - c->range, 0); tx < FFMIN(x + c->range, c->avctx->width - bw); tx++){
98 if(tx == x && ty == y) continue; // we already tested this block
101 tv = block_cmp(src, sstride, prev + dx + dy*pstride, pstride, bw, bh);
113 static int encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_size, void *data)
115 ZmbvEncContext * const c = avctx->priv_data;
116 AVFrame *pict = data;
117 AVFrame * const p = &c->pic;
128 keyframe = !c->curfrm;
130 if(c->curfrm == c->keyint)
133 p->pict_type= keyframe ? FF_I_TYPE : FF_P_TYPE;
134 p->key_frame= keyframe;
135 chpal = !keyframe && memcmp(p->data[1], c->pal2, 1024);
137 fl = (keyframe ? ZMBV_KEYFRAME : 0) | (chpal ? ZMBV_DELTAPAL : 0);
140 deflateReset(&c->zstream);
141 *buf++ = 0; len++; // hi ver
142 *buf++ = 1; len++; // lo ver
143 *buf++ = 1; len++; // comp
144 *buf++ = 4; len++; // format - 8bpp
145 *buf++ = ZMBV_BLOCK; len++; // block width
146 *buf++ = ZMBV_BLOCK; len++; // block height
148 palptr = (uint32_t*)p->data[1];
153 for(i = 0; i < 256; i++){
154 AV_WB24(tpal, palptr[i]);
155 c->work_buf[work_size++] = tpal[0] ^ c->pal[i * 3 + 0];
156 c->work_buf[work_size++] = tpal[1] ^ c->pal[i * 3 + 1];
157 c->work_buf[work_size++] = tpal[2] ^ c->pal[i * 3 + 2];
158 c->pal[i * 3 + 0] = tpal[0];
159 c->pal[i * 3 + 1] = tpal[1];
160 c->pal[i * 3 + 2] = tpal[2];
162 memcpy(c->pal2, p->data[1], 1024);
165 for(i = 0; i < 256; i++){
166 AV_WB24(c->pal+(i*3), palptr[i]);
168 memcpy(c->work_buf, c->pal, 768);
169 memcpy(c->pal2, p->data[1], 1024);
171 for(i = 0; i < avctx->height; i++){
172 memcpy(c->work_buf + work_size, src, avctx->width);
173 src += p->linesize[0];
174 work_size += avctx->width;
178 uint8_t *tsrc, *tprev;
182 bw = (avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK;
183 bh = (avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK;
184 mv = c->work_buf + work_size;
185 memset(c->work_buf + work_size, 0, (bw * bh * 2 + 3) & ~3);
186 work_size += (bw * bh * 2 + 3) & ~3;
187 /* for now just XOR'ing */
188 for(y = 0; y < avctx->height; y += ZMBV_BLOCK) {
189 bh2 = FFMIN(avctx->height - y, ZMBV_BLOCK);
190 for(x = 0; x < avctx->width; x += ZMBV_BLOCK, mv += 2) {
191 bw2 = FFMIN(avctx->width - x, ZMBV_BLOCK);
196 bv = zmbv_me(c, tsrc, p->linesize[0], tprev, c->pstride, x, y, &mx, &my);
197 mv[0] = (mx << 1) | !!bv;
199 tprev += mx + my * c->pstride;
201 for(j = 0; j < bh2; j++){
202 for(i = 0; i < bw2; i++)
203 c->work_buf[work_size++] = tsrc[i] ^ tprev[i];
204 tsrc += p->linesize[0];
209 src += p->linesize[0] * ZMBV_BLOCK;
210 prev += c->pstride * ZMBV_BLOCK;
213 /* save the previous frame */
216 for(i = 0; i < avctx->height; i++){
217 memcpy(prev, src, avctx->width);
219 src += p->linesize[0];
222 c->zstream.next_in = c->work_buf;
223 c->zstream.avail_in = work_size;
224 c->zstream.total_in = 0;
226 c->zstream.next_out = c->comp_buf;
227 c->zstream.avail_out = c->comp_size;
228 c->zstream.total_out = 0;
229 if((zret = deflate(&c->zstream, Z_SYNC_FLUSH)) != Z_OK){
230 av_log(avctx, AV_LOG_ERROR, "Error compressing data\n");
234 memcpy(buf, c->comp_buf, c->zstream.total_out);
235 return len + c->zstream.total_out;
242 static av_cold int encode_init(AVCodecContext *avctx)
244 ZmbvEncContext * const c = avctx->priv_data;
245 int zret; // Zlib return code
250 score_tab[i]= -i * log(i/(double)(ZMBV_BLOCK*ZMBV_BLOCK)) * (256/M_LN2);
255 c->keyint = avctx->keyint_min;
257 if(avctx->me_range > 0)
258 c->range = FFMIN(avctx->me_range, 127);
260 if(avctx->compression_level >= 0)
261 lvl = avctx->compression_level;
262 if(lvl < 0 || lvl > 9){
263 av_log(avctx, AV_LOG_ERROR, "Compression level should be 0-9, not %i\n", lvl);
267 if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
271 // Needed if zlib unused or init aborted before deflateInit
272 memset(&(c->zstream), 0, sizeof(z_stream));
273 c->comp_size = avctx->width * avctx->height + 1024 +
274 ((avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * ((avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * 2 + 4;
275 if ((c->work_buf = av_malloc(c->comp_size)) == NULL) {
276 av_log(avctx, AV_LOG_ERROR, "Can't allocate work buffer.\n");
279 /* Conservative upper bound taken from zlib v1.2.1 source via lcl.c */
280 c->comp_size = c->comp_size + ((c->comp_size + 7) >> 3) +
281 ((c->comp_size + 63) >> 6) + 11;
283 /* Allocate compression buffer */
284 if ((c->comp_buf = av_malloc(c->comp_size)) == NULL) {
285 av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
288 c->pstride = (avctx->width + 15) & ~15;
289 if ((c->prev = av_malloc(c->pstride * avctx->height)) == NULL) {
290 av_log(avctx, AV_LOG_ERROR, "Can't allocate picture.\n");
294 c->zstream.zalloc = Z_NULL;
295 c->zstream.zfree = Z_NULL;
296 c->zstream.opaque = Z_NULL;
297 zret = deflateInit(&(c->zstream), lvl);
299 av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
303 avctx->coded_frame = (AVFrame*)&c->pic;
311 * Uninit zmbv encoder
313 static av_cold int encode_end(AVCodecContext *avctx)
315 ZmbvEncContext * const c = avctx->priv_data;
317 av_freep(&c->comp_buf);
318 av_freep(&c->work_buf);
320 deflateEnd(&(c->zstream));
326 AVCodec zmbv_encoder = {
330 sizeof(ZmbvEncContext),
334 .pix_fmts = (enum PixelFormat[]){PIX_FMT_PAL8, PIX_FMT_NONE},
335 .long_name = NULL_IF_CONFIG_SMALL("Zip Motion Blocks Video"),