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
25 * Zip Motion Blocks Video encoder
37 #define ZMBV_KEYFRAME 1
38 #define ZMBV_DELTAPAL 2
45 typedef struct ZmbvEncContext {
46 AVCodecContext *avctx;
50 uint8_t *comp_buf, *work_buf;
52 uint32_t pal2[256]; //for quick comparisons
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)
69 for(j = 0; j < bh; j++){
70 for(i = 0; i < bw; i++)
71 sum += src[i] ^ src2[i];
78 /** Motion estimation function
79 * TODO make better ME decisions
81 static int zmbv_me(ZmbvEncContext *c, uint8_t *src, int sstride, uint8_t *prev, int pstride,
82 int x, int y, int *mx, int *my)
84 int dx, dy, tx, ty, tv, bv;
87 bv = block_cmp(src, sstride, prev, pstride, ZMBV_BLOCK, ZMBV_BLOCK);
89 for(ty = FFMAX(y - c->range, 0); ty < FFMIN(y + c->range, c->avctx->height - ZMBV_BLOCK); ty++){
90 for(tx = FFMAX(x - c->range, 0); tx < FFMIN(x + c->range, c->avctx->width - ZMBV_BLOCK); tx++){
91 if(tx == x && ty == y) continue; // we already tested this block
94 tv = block_cmp(src, sstride, prev + dx + dy*pstride, pstride, ZMBV_BLOCK, ZMBV_BLOCK);
106 static int encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_size, void *data)
108 ZmbvEncContext * const c = (ZmbvEncContext *)avctx->priv_data;
109 AVFrame *pict = data;
110 AVFrame * const p = &c->pic;
121 keyframe = !c->curfrm;
122 c->curfrm = c->curfrm++;
123 if(c->curfrm == c->keyint)
126 p->pict_type= keyframe ? FF_I_TYPE : FF_P_TYPE;
127 p->key_frame= keyframe;
128 chpal = !keyframe && memcmp(p->data[1], c->pal2, 1024);
130 fl = (keyframe ? ZMBV_KEYFRAME : 0) | (chpal ? ZMBV_DELTAPAL : 0);
133 deflateReset(&c->zstream);
134 *buf++ = 0; len++; // hi ver
135 *buf++ = 1; len++; // lo ver
136 *buf++ = 1; len++; // comp
137 *buf++ = 4; len++; // format - 8bpp
138 *buf++ = ZMBV_BLOCK; len++; // block width
139 *buf++ = ZMBV_BLOCK; len++; // block height
141 palptr = (uint32_t*)p->data[1];
146 for(i = 0; i < 256; i++){
147 tpal[0] = palptr[i] >> 16;
148 tpal[1] = palptr[i] >> 8;
150 c->work_buf[work_size++] = tpal[0] ^ c->pal[i * 3 + 0];
151 c->work_buf[work_size++] = tpal[1] ^ c->pal[i * 3 + 1];
152 c->work_buf[work_size++] = tpal[2] ^ c->pal[i * 3 + 2];
153 c->pal[i * 3 + 0] = tpal[0];
154 c->pal[i * 3 + 1] = tpal[1];
155 c->pal[i * 3 + 2] = tpal[2];
157 memcpy(c->pal2, p->data[1], 1024);
160 for(i = 0; i < 256; i++){
161 c->pal[i*3 + 0] = palptr[i] >> 16;
162 c->pal[i*3 + 1] = palptr[i] >> 8;
163 c->pal[i*3 + 2] = palptr[i];
165 memcpy(c->work_buf, c->pal, 768);
166 memcpy(c->pal2, p->data[1], 1024);
168 for(i = 0; i < avctx->height; i++){
169 memcpy(c->work_buf + work_size, src, avctx->width);
170 src += p->linesize[0];
171 work_size += avctx->width;
175 uint8_t *tsrc, *tprev;
179 bw = (avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK;
180 bh = (avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK;
181 mv = c->work_buf + work_size;
182 memset(c->work_buf + work_size, 0, (bw * bh * 2 + 3) & ~3);
183 work_size += (bw * bh * 2 + 3) & ~3;
184 /* for now just XOR'ing */
185 for(y = 0; y < avctx->height; y += ZMBV_BLOCK) {
186 bh2 = FFMIN(avctx->height - y, ZMBV_BLOCK);
187 for(x = 0; x < avctx->width; x += ZMBV_BLOCK, mv += 2) {
188 bw2 = FFMIN(avctx->width - x, ZMBV_BLOCK);
193 bv = zmbv_me(c, tsrc, p->linesize[0], tprev, c->pstride, x, y, &mx, &my);
194 mv[0] = (mx << 1) | !!bv;
196 tprev += mx + my * c->pstride;
198 for(j = 0; j < bh2; j++){
199 for(i = 0; i < bw2; i++)
200 c->work_buf[work_size++] = tsrc[i] ^ tprev[i];
201 tsrc += p->linesize[0];
206 src += p->linesize[0] * ZMBV_BLOCK;
207 prev += c->pstride * ZMBV_BLOCK;
210 /* save the previous frame */
213 for(i = 0; i < avctx->height; i++){
214 memcpy(prev, src, avctx->width);
216 src += p->linesize[0];
219 c->zstream.next_in = c->work_buf;
220 c->zstream.avail_in = work_size;
221 c->zstream.total_in = 0;
223 c->zstream.next_out = c->comp_buf;
224 c->zstream.avail_out = c->comp_size;
225 c->zstream.total_out = 0;
226 if((zret = deflate(&c->zstream, Z_SYNC_FLUSH)) != Z_OK){
227 av_log(avctx, AV_LOG_ERROR, "Error compressing data\n");
231 memcpy(buf, c->comp_buf, c->zstream.total_out);
232 return len + c->zstream.total_out;
239 static int encode_init(AVCodecContext *avctx)
241 ZmbvEncContext * const c = (ZmbvEncContext *)avctx->priv_data;
242 int zret; // Zlib return code
247 c->pic.data[0] = NULL;
249 c->keyint = avctx->keyint_min;
251 if(avctx->me_range > 0)
252 c->range = FFMIN(avctx->me_range, 127);
254 if(avctx->compression_level >= 0)
255 lvl = avctx->compression_level;
256 if(lvl < 0 || lvl > 9){
257 av_log(avctx, AV_LOG_ERROR, "Compression level should be 0-9, not %i\n", lvl);
261 if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
265 // Needed if zlib unused or init aborted before deflateInit
266 memset(&(c->zstream), 0, sizeof(z_stream));
267 c->comp_size = avctx->width * avctx->height + 1024 +
268 ((avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * ((avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK) * 2 + 4;
269 if ((c->work_buf = av_malloc(c->comp_size)) == NULL) {
270 av_log(avctx, AV_LOG_ERROR, "Can't allocate work buffer.\n");
273 /* Conservative upper bound taken from zlib v1.2.1 source via lcl.c */
274 c->comp_size = c->comp_size + ((c->comp_size + 7) >> 3) +
275 ((c->comp_size + 63) >> 6) + 11;
277 /* Allocate compression buffer */
278 if ((c->comp_buf = av_malloc(c->comp_size)) == NULL) {
279 av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
282 c->pstride = (avctx->width + 15) & ~15;
283 if ((c->prev = av_malloc(c->pstride * avctx->height)) == NULL) {
284 av_log(avctx, AV_LOG_ERROR, "Can't allocate picture.\n");
288 c->zstream.zalloc = Z_NULL;
289 c->zstream.zfree = Z_NULL;
290 c->zstream.opaque = Z_NULL;
291 zret = deflateInit(&(c->zstream), lvl);
293 av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
303 * Uninit zmbv decoder
305 static int encode_end(AVCodecContext *avctx)
307 ZmbvEncContext * const c = (ZmbvEncContext *)avctx->priv_data;
309 av_freep(&c->comp_buf);
310 av_freep(&c->work_buf);
312 deflateEnd(&(c->zstream));
318 AVCodec zmbv_encoder = {
322 sizeof(ZmbvEncContext),
326 .pix_fmts = (enum PixelFormat[]){PIX_FMT_PAL8, -1},