Statistics
| Branch: | Revision:

ffmpeg / libavcodec / zmbvenc.c @ 76693729

History | View | Annotate | Download (9.45 KB)

1 76693729 Kostya Shishkov
/*
2
 * Zip Motion Blocks Video (ZMBV) encoder
3
 * Copyright (c) 2006 Konstantin Shishkov
4
 *
5
 * This file is part of FFmpeg.
6
 *
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.
11
 *
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.
16
 *
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
20
 *
21
 */
22
23
/**
24
 * @file zmbvenc.c
25
 * Zip Motion Blocks Video encoder
26
 */
27
28
#include <stdio.h>
29
#include <stdlib.h>
30
31
#include "common.h"
32
#include "avcodec.h"
33
34
#ifdef CONFIG_ZLIB
35
#include <zlib.h>
36
37
#define ZMBV_KEYFRAME 1
38
#define ZMBV_DELTAPAL 2
39
40
#define ZMBV_BLOCK 16
41
42
/**
43
 * Encoder context
44
 */
45
typedef struct ZmbvEncContext {
46
    AVCodecContext *avctx;
47
    AVFrame pic;
48
49
    int range;
50
    uint8_t *comp_buf, *work_buf;
51
    uint8_t pal[768];
52
    uint32_t pal2[256]; //for quick comparisons
53
    uint8_t *prev;
54
    int pstride;
55
    int comp_size;
56
    int keyint, curfrm;
57
    z_stream zstream;
58
} ZmbvEncContext;
59
60
/** Block comparing function
61
 * XXX should be optimized and moved to DSPContext
62
 * TODO handle out of edge ME
63
 */
64
static inline int block_cmp(uint8_t *src, int stride, uint8_t *src2, int stride2, int bw, int bh)
65
{
66
    int sum = 0;
67
    int i, j;
68
69
    for(j = 0; j < bh; j++){
70
        for(i = 0; i < bw; i++)
71
            sum += src[i] ^ src2[i];
72
        src += stride;
73
        src2 += stride2;
74
    }
75
    return sum;
76
}
77
78
/** Motion estimation function
79
 * TODO make better ME decisions
80
 */
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)
83
{
84
    int dx, dy, tx, ty, tv, bv;
85
86
    *mx = *my = 0;
87
    bv = block_cmp(src, sstride, prev, pstride, ZMBV_BLOCK, ZMBV_BLOCK);
88
    if(!bv) return 0;
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
92
            dx = tx - x;
93
            dy = ty - y;
94
            tv = block_cmp(src, sstride, prev + dx + dy*pstride, pstride, ZMBV_BLOCK, ZMBV_BLOCK);
95
            if(tv < bv){
96
                 bv = tv;
97
                 *mx = dx;
98
                 *my = dy;
99
                 if(!bv) return 0;
100
             }
101
         }
102
    }
103
    return bv;
104
}
105
106
static int encode_frame(AVCodecContext *avctx, uint8_t *buf, int buf_size, void *data)
107
{
108
    ZmbvEncContext * const c = (ZmbvEncContext *)avctx->priv_data;
109
    AVFrame *pict = data;
110
    AVFrame * const p = &c->pic;
111
    uint8_t *src, *prev;
112
    uint32_t *palptr;
113
    int zret = Z_OK;
114
    int len = 0;
115
    int keyframe, chpal;
116
    int fl;
117
    int work_size = 0;
118
    int bw, bh;
119
    int i, j;
120
121
    keyframe = !c->curfrm;
122
    c->curfrm = c->curfrm++;
123
    if(c->curfrm == c->keyint)
124
        c->curfrm = 0;
125
    *p = *pict;
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);
129
130
    fl = (keyframe ? ZMBV_KEYFRAME : 0) | (chpal ? ZMBV_DELTAPAL : 0);
131
    *buf++ = fl; len++;
132
    if(keyframe){
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
140
    }
141
    palptr = (uint32_t*)p->data[1];
142
    src = p->data[0];
143
    prev = c->prev;
144
    if(chpal){
145
        uint8_t tpal[3];
146
        for(i = 0; i < 256; i++){
147
            tpal[0] = palptr[i] >> 16;
148
            tpal[1] = palptr[i] >>  8;
149
            tpal[2] = palptr[i];
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];
156
        }
157
        memcpy(c->pal2, p->data[1], 1024);
158
    }
159
    if(keyframe){
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];
164
        }
165
        memcpy(c->work_buf, c->pal, 768);
166
        memcpy(c->pal2, p->data[1], 1024);
167
        work_size = 768;
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;
172
        }
173
    }else{
174
        int x, y, bh2, bw2;
175
        uint8_t *tsrc, *tprev;
176
        uint8_t *mv;
177
        int mx, my, bv;
178
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);
189
190
                tsrc = src + x;
191
                tprev = prev + x;
192
193
                bv = zmbv_me(c, tsrc, p->linesize[0], tprev, c->pstride, x, y, &mx, &my);
194
                mv[0] = (mx << 1) | !!bv;
195
                mv[1] = my << 1;
196
                tprev += mx + my * c->pstride;
197
                if(bv){
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];
202
                        tprev += c->pstride;
203
                    }
204
                }
205
            }
206
            src += p->linesize[0] * ZMBV_BLOCK;
207
            prev += c->pstride * ZMBV_BLOCK;
208
        }
209
    }
210
    /* save the previous frame */
211
    src = p->data[0];
212
    prev = c->prev;
213
    for(i = 0; i < avctx->height; i++){
214
        memcpy(prev, src, avctx->width);
215
        prev += c->pstride;
216
        src += p->linesize[0];
217
    }
218
219
    c->zstream.next_in = c->work_buf;
220
    c->zstream.avail_in = work_size;
221
    c->zstream.total_in = 0;
222
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");
228
        return -1;
229
    }
230
231
    memcpy(buf, c->comp_buf, c->zstream.total_out);
232
    return len + c->zstream.total_out;
233
}
234
235
236
/**
237
 * Init zmbv encoder
238
 */
239
static int encode_init(AVCodecContext *avctx)
240
{
241
    ZmbvEncContext * const c = (ZmbvEncContext *)avctx->priv_data;
242
    int zret; // Zlib return code
243
    int lvl = 9;
244
245
    c->avctx = avctx;
246
247
    c->pic.data[0] = NULL;
248
    c->curfrm = 0;
249
    c->keyint = avctx->keyint_min;
250
    c->range = 8;
251
    if(avctx->me_range > 0)
252
        c->range = FFMIN(avctx->me_range, 127);
253
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);
258
        return -1;
259
    }
260
261
    if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
262
        return -1;
263
    }
264
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");
271
        return -1;
272
    }
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;
276
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");
280
        return -1;
281
    }
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");
285
        return -1;
286
    }
287
288
    c->zstream.zalloc = Z_NULL;
289
    c->zstream.zfree = Z_NULL;
290
    c->zstream.opaque = Z_NULL;
291
    zret = deflateInit(&(c->zstream), lvl);
292
    if (zret != Z_OK) {
293
        av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
294
        return -1;
295
    }
296
297
    return 0;
298
}
299
300
301
302
/**
303
 * Uninit zmbv decoder
304
 */
305
static int encode_end(AVCodecContext *avctx)
306
{
307
    ZmbvEncContext * const c = (ZmbvEncContext *)avctx->priv_data;
308
309
    av_freep(&c->comp_buf);
310
    av_freep(&c->work_buf);
311
312
    deflateEnd(&(c->zstream));
313
    av_freep(&c->prev);
314
315
    return 0;
316
}
317
318
AVCodec zmbv_encoder = {
319
    "zmbv",
320
    CODEC_TYPE_VIDEO,
321
    CODEC_ID_ZMBV,
322
    sizeof(ZmbvEncContext),
323
    encode_init,
324
    encode_frame,
325
    encode_end,
326
    .pix_fmts = (enum PixelFormat[]){PIX_FMT_PAL8, -1},
327
};
328
#endif