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
24
* Zip Motion Blocks Video encoder
34
#define ZMBV_KEYFRAME 1
35
#define ZMBV_DELTAPAL 2
42
typedef struct ZmbvEncContext {
43
AVCodecContext *avctx;
47
uint8_t *comp_buf, *work_buf;
49
uint32_t pal2[256]; //for quick comparisons
57
static int score_tab[256];
59
/** Block comparing function
60
* XXX should be optimized and moved to DSPContext
61
* TODO handle out of edge ME
63
static inline int block_cmp(uint8_t *src, int stride, uint8_t *src2, int stride2, int bw, int bh)
67
uint8_t histogram[256]={0};
69
for(j = 0; j < bh; j++){
70
for(i = 0; i < bw; i++)
71
histogram[src[i] ^ src2[i]]++;
77
sum+= score_tab[histogram[i]];
82
/** Motion estimation function
83
* TODO make better ME decisions
85
static int zmbv_me(ZmbvEncContext *c, uint8_t *src, int sstride, uint8_t *prev, int pstride,
86
int x, int y, int *mx, int *my)
88
int dx, dy, tx, ty, tv, bv, bw, bh;
91
bw = FFMIN(ZMBV_BLOCK, c->avctx->width - x);
92
bh = FFMIN(ZMBV_BLOCK, c->avctx->height - y);
93
bv = block_cmp(src, sstride, prev, pstride, bw, bh);
95
for(ty = FFMAX(y - c->range, 0); ty < FFMIN(y + c->range, c->avctx->height - bh); ty++){
96
for(tx = FFMAX(x - c->range, 0); tx < FFMIN(x + c->range, c->avctx->width - bw); tx++){
97
if(tx == x && ty == y) continue; // we already tested this block
100
tv = block_cmp(src, sstride, prev + dx + dy*pstride, pstride, bw, bh);
112
static int encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_size, void *data)
114
ZmbvEncContext * const c = avctx->priv_data;
115
AVFrame *pict = data;
116
AVFrame * const p = &c->pic;
127
keyframe = !c->curfrm;
129
if(c->curfrm == c->keyint)
132
p->pict_type= keyframe ? FF_I_TYPE : FF_P_TYPE;
133
p->key_frame= keyframe;
134
chpal = !keyframe && memcmp(p->data[1], c->pal2, 1024);
136
fl = (keyframe ? ZMBV_KEYFRAME : 0) | (chpal ? ZMBV_DELTAPAL : 0);
139
deflateReset(&c->zstream);
140
*buf++ = 0; len++; // hi ver
141
*buf++ = 1; len++; // lo ver
142
*buf++ = 1; len++; // comp
143
*buf++ = 4; len++; // format - 8bpp
144
*buf++ = ZMBV_BLOCK; len++; // block width
145
*buf++ = ZMBV_BLOCK; len++; // block height
147
palptr = (uint32_t*)p->data[1];
152
for(i = 0; i < 256; i++){
153
AV_WB24(tpal, palptr[i]);
154
c->work_buf[work_size++] = tpal[0] ^ c->pal[i * 3 + 0];
155
c->work_buf[work_size++] = tpal[1] ^ c->pal[i * 3 + 1];
156
c->work_buf[work_size++] = tpal[2] ^ c->pal[i * 3 + 2];
157
c->pal[i * 3 + 0] = tpal[0];
158
c->pal[i * 3 + 1] = tpal[1];
159
c->pal[i * 3 + 2] = tpal[2];
161
memcpy(c->pal2, p->data[1], 1024);
164
for(i = 0; i < 256; i++){
165
AV_WB24(c->pal+(i*3), palptr[i]);
167
memcpy(c->work_buf, c->pal, 768);
168
memcpy(c->pal2, p->data[1], 1024);
170
for(i = 0; i < avctx->height; i++){
171
memcpy(c->work_buf + work_size, src, avctx->width);
172
src += p->linesize[0];
173
work_size += avctx->width;
177
uint8_t *tsrc, *tprev;
181
bw = (avctx->width + ZMBV_BLOCK - 1) / ZMBV_BLOCK;
182
bh = (avctx->height + ZMBV_BLOCK - 1) / ZMBV_BLOCK;
183
mv = c->work_buf + work_size;
184
memset(c->work_buf + work_size, 0, (bw * bh * 2 + 3) & ~3);
185
work_size += (bw * bh * 2 + 3) & ~3;
186
/* for now just XOR'ing */
187
for(y = 0; y < avctx->height; y += ZMBV_BLOCK) {
188
bh2 = FFMIN(avctx->height - y, ZMBV_BLOCK);
189
for(x = 0; x < avctx->width; x += ZMBV_BLOCK, mv += 2) {
190
bw2 = FFMIN(avctx->width - x, ZMBV_BLOCK);
195
bv = zmbv_me(c, tsrc, p->linesize[0], tprev, c->pstride, x, y, &mx, &my);
196
mv[0] = (mx << 1) | !!bv;
198
tprev += mx + my * c->pstride;
200
for(j = 0; j < bh2; j++){
201
for(i = 0; i < bw2; i++)
202
c->work_buf[work_size++] = tsrc[i] ^ tprev[i];
203
tsrc += p->linesize[0];
208
src += p->linesize[0] * ZMBV_BLOCK;
209
prev += c->pstride * ZMBV_BLOCK;
212
/* save the previous frame */
215
for(i = 0; i < avctx->height; i++){
216
memcpy(prev, src, avctx->width);
218
src += p->linesize[0];
221
c->zstream.next_in = c->work_buf;
222
c->zstream.avail_in = work_size;
223
c->zstream.total_in = 0;
225
c->zstream.next_out = c->comp_buf;
226
c->zstream.avail_out = c->comp_size;
227
c->zstream.total_out = 0;
228
if((zret = deflate(&c->zstream, Z_SYNC_FLUSH)) != Z_OK){
229
av_log(avctx, AV_LOG_ERROR, "Error compressing data\n");
233
memcpy(buf, c->comp_buf, c->zstream.total_out);
234
return len + c->zstream.total_out;
241
static av_cold int encode_init(AVCodecContext *avctx)
243
ZmbvEncContext * const c = avctx->priv_data;
244
int zret; // Zlib return code
249
score_tab[i]= -i * log(i/(double)(ZMBV_BLOCK*ZMBV_BLOCK)) * (256/M_LN2);
253
c->pic.data[0] = NULL;
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);
309
* Uninit zmbv encoder
311
static av_cold int encode_end(AVCodecContext *avctx)
313
ZmbvEncContext * const c = avctx->priv_data;
315
av_freep(&c->comp_buf);
316
av_freep(&c->work_buf);
318
deflateEnd(&(c->zstream));
324
AVCodec zmbv_encoder = {
328
sizeof(ZmbvEncContext),
332
.pix_fmts = (enum PixelFormat[]){PIX_FMT_PAL8, PIX_FMT_NONE},
333
.long_name = "Zip Motion Blocks Video",