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1
/*
2
 * Zip Motion Blocks Video (ZMBV) decoder
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
 *
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 * You should have received a copy of the GNU Lesser General Public
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 * 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
 * @file libavcodec/zmbv.c
24
 * Zip Motion Blocks Video decoder
25
 */
26

    
27
#include <stdio.h>
28
#include <stdlib.h>
29

    
30
#include "libavutil/intreadwrite.h"
31
#include "avcodec.h"
32

    
33
#include <zlib.h>
34

    
35
#define ZMBV_KEYFRAME 1
36
#define ZMBV_DELTAPAL 2
37

    
38
enum ZmbvFormat {
39
    ZMBV_FMT_NONE  = 0,
40
    ZMBV_FMT_1BPP  = 1,
41
    ZMBV_FMT_2BPP  = 2,
42
    ZMBV_FMT_4BPP  = 3,
43
    ZMBV_FMT_8BPP  = 4,
44
    ZMBV_FMT_15BPP = 5,
45
    ZMBV_FMT_16BPP = 6,
46
    ZMBV_FMT_24BPP = 7,
47
    ZMBV_FMT_32BPP = 8
48
};
49

    
50
/*
51
 * Decoder context
52
 */
53
typedef struct ZmbvContext {
54
    AVCodecContext *avctx;
55
    AVFrame pic;
56

    
57
    int bpp;
58
    unsigned int decomp_size;
59
    uint8_t* decomp_buf;
60
    uint8_t pal[768];
61
    uint8_t *prev, *cur;
62
    int width, height;
63
    int fmt;
64
    int comp;
65
    int flags;
66
    int bw, bh, bx, by;
67
    int decomp_len;
68
    z_stream zstream;
69
    int (*decode_intra)(struct ZmbvContext *c);
70
    int (*decode_xor)(struct ZmbvContext *c);
71
} ZmbvContext;
72

    
73
/**
74
 * Decode XOR'ed frame - 8bpp version
75
 */
76

    
77
static int zmbv_decode_xor_8(ZmbvContext *c)
78
{
79
    uint8_t *src = c->decomp_buf;
80
    uint8_t *output, *prev;
81
    int8_t *mvec;
82
    int x, y;
83
    int d, dx, dy, bw2, bh2;
84
    int block;
85
    int i, j;
86
    int mx, my;
87

    
88
    output = c->cur;
89
    prev = c->prev;
90

    
91
    if(c->flags & ZMBV_DELTAPAL){
92
        for(i = 0; i < 768; i++)
93
            c->pal[i] ^= *src++;
94
    }
95

    
96
    mvec = (int8_t*)src;
97
    src += ((c->bx * c->by * 2 + 3) & ~3);
98

    
99
    block = 0;
100
    for(y = 0; y < c->height; y += c->bh) {
101
        bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
102
        for(x = 0; x < c->width; x += c->bw) {
103
            uint8_t *out, *tprev;
104

    
105
            d = mvec[block] & 1;
106
            dx = mvec[block] >> 1;
107
            dy = mvec[block + 1] >> 1;
108
            block += 2;
109

    
110
            bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
111

    
112
            /* copy block - motion vectors out of bounds are used to zero blocks */
113
            out = output + x;
114
            tprev = prev + x + dx + dy * c->width;
115
            mx = x + dx;
116
            my = y + dy;
117
            for(j = 0; j < bh2; j++){
118
                if((my + j < 0) || (my + j >= c->height)) {
119
                    memset(out, 0, bw2);
120
                } else {
121
                    for(i = 0; i < bw2; i++){
122
                        if((mx + i < 0) || (mx + i >= c->width))
123
                            out[i] = 0;
124
                        else
125
                            out[i] = tprev[i];
126
                    }
127
                }
128
                out += c->width;
129
                tprev += c->width;
130
            }
131

    
132
            if(d) { /* apply XOR'ed difference */
133
                out = output + x;
134
                for(j = 0; j < bh2; j++){
135
                    for(i = 0; i < bw2; i++)
136
                        out[i] ^= *src++;
137
                    out += c->width;
138
                }
139
            }
140
        }
141
        output += c->width * c->bh;
142
        prev += c->width * c->bh;
143
    }
144
    if(src - c->decomp_buf != c->decomp_len)
145
        av_log(c->avctx, AV_LOG_ERROR, "Used %ti of %i bytes\n", src-c->decomp_buf, c->decomp_len);
146
    return 0;
147
}
148

    
149
/**
150
 * Decode XOR'ed frame - 15bpp and 16bpp version
151
 */
152

    
153
static int zmbv_decode_xor_16(ZmbvContext *c)
154
{
155
    uint8_t *src = c->decomp_buf;
156
    uint16_t *output, *prev;
157
    int8_t *mvec;
158
    int x, y;
159
    int d, dx, dy, bw2, bh2;
160
    int block;
161
    int i, j;
162
    int mx, my;
163

    
164
    output = (uint16_t*)c->cur;
165
    prev = (uint16_t*)c->prev;
166

    
167
    mvec = (int8_t*)src;
168
    src += ((c->bx * c->by * 2 + 3) & ~3);
169

    
170
    block = 0;
171
    for(y = 0; y < c->height; y += c->bh) {
172
        bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
173
        for(x = 0; x < c->width; x += c->bw) {
174
            uint16_t *out, *tprev;
175

    
176
            d = mvec[block] & 1;
177
            dx = mvec[block] >> 1;
178
            dy = mvec[block + 1] >> 1;
179
            block += 2;
180

    
181
            bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
182

    
183
            /* copy block - motion vectors out of bounds are used to zero blocks */
184
            out = output + x;
185
            tprev = prev + x + dx + dy * c->width;
186
            mx = x + dx;
187
            my = y + dy;
188
            for(j = 0; j < bh2; j++){
189
                if((my + j < 0) || (my + j >= c->height)) {
190
                    memset(out, 0, bw2 * 2);
191
                } else {
192
                    for(i = 0; i < bw2; i++){
193
                        if((mx + i < 0) || (mx + i >= c->width))
194
                            out[i] = 0;
195
                        else
196
                            out[i] = tprev[i];
197
                    }
198
                }
199
                out += c->width;
200
                tprev += c->width;
201
            }
202

    
203
            if(d) { /* apply XOR'ed difference */
204
                out = output + x;
205
                for(j = 0; j < bh2; j++){
206
                    for(i = 0; i < bw2; i++) {
207
                        out[i] ^= *((uint16_t*)src);
208
                        src += 2;
209
                    }
210
                    out += c->width;
211
                }
212
            }
213
        }
214
        output += c->width * c->bh;
215
        prev += c->width * c->bh;
216
    }
217
    if(src - c->decomp_buf != c->decomp_len)
218
        av_log(c->avctx, AV_LOG_ERROR, "Used %ti of %i bytes\n", src-c->decomp_buf, c->decomp_len);
219
    return 0;
220
}
221

    
222
#ifdef ZMBV_ENABLE_24BPP
223
/**
224
 * Decode XOR'ed frame - 24bpp version
225
 */
226

    
227
static int zmbv_decode_xor_24(ZmbvContext *c)
228
{
229
    uint8_t *src = c->decomp_buf;
230
    uint8_t *output, *prev;
231
    int8_t *mvec;
232
    int x, y;
233
    int d, dx, dy, bw2, bh2;
234
    int block;
235
    int i, j;
236
    int mx, my;
237
    int stride;
238

    
239
    output = c->cur;
240
    prev = c->prev;
241

    
242
    stride = c->width * 3;
243
    mvec = (int8_t*)src;
244
    src += ((c->bx * c->by * 2 + 3) & ~3);
245

    
246
    block = 0;
247
    for(y = 0; y < c->height; y += c->bh) {
248
        bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
249
        for(x = 0; x < c->width; x += c->bw) {
250
            uint8_t *out, *tprev;
251

    
252
            d = mvec[block] & 1;
253
            dx = mvec[block] >> 1;
254
            dy = mvec[block + 1] >> 1;
255
            block += 2;
256

    
257
            bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
258

    
259
            /* copy block - motion vectors out of bounds are used to zero blocks */
260
            out = output + x * 3;
261
            tprev = prev + (x + dx) * 3 + dy * stride;
262
            mx = x + dx;
263
            my = y + dy;
264
            for(j = 0; j < bh2; j++){
265
                if((my + j < 0) || (my + j >= c->height)) {
266
                    memset(out, 0, bw2 * 3);
267
                } else {
268
                    for(i = 0; i < bw2; i++){
269
                        if((mx + i < 0) || (mx + i >= c->width)) {
270
                            out[i * 3 + 0] = 0;
271
                            out[i * 3 + 1] = 0;
272
                            out[i * 3 + 2] = 0;
273
                        } else {
274
                            out[i * 3 + 0] = tprev[i * 3 + 0];
275
                            out[i * 3 + 1] = tprev[i * 3 + 1];
276
                            out[i * 3 + 2] = tprev[i * 3 + 2];
277
                        }
278
                    }
279
                }
280
                out += stride;
281
                tprev += stride;
282
            }
283

    
284
            if(d) { /* apply XOR'ed difference */
285
                out = output + x * 3;
286
                for(j = 0; j < bh2; j++){
287
                    for(i = 0; i < bw2; i++) {
288
                        out[i * 3 + 0] ^= *src++;
289
                        out[i * 3 + 1] ^= *src++;
290
                        out[i * 3 + 2] ^= *src++;
291
                    }
292
                    out += stride;
293
                }
294
            }
295
        }
296
        output += stride * c->bh;
297
        prev += stride * c->bh;
298
    }
299
    if(src - c->decomp_buf != c->decomp_len)
300
        av_log(c->avctx, AV_LOG_ERROR, "Used %i of %i bytes\n", src-c->decomp_buf, c->decomp_len);
301
    return 0;
302
}
303
#endif //ZMBV_ENABLE_24BPP
304

    
305
/**
306
 * Decode XOR'ed frame - 32bpp version
307
 */
308

    
309
static int zmbv_decode_xor_32(ZmbvContext *c)
310
{
311
    uint8_t *src = c->decomp_buf;
312
    uint32_t *output, *prev;
313
    int8_t *mvec;
314
    int x, y;
315
    int d, dx, dy, bw2, bh2;
316
    int block;
317
    int i, j;
318
    int mx, my;
319

    
320
    output = (uint32_t*)c->cur;
321
    prev = (uint32_t*)c->prev;
322

    
323
    mvec = (int8_t*)src;
324
    src += ((c->bx * c->by * 2 + 3) & ~3);
325

    
326
    block = 0;
327
    for(y = 0; y < c->height; y += c->bh) {
328
        bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
329
        for(x = 0; x < c->width; x += c->bw) {
330
            uint32_t *out, *tprev;
331

    
332
            d = mvec[block] & 1;
333
            dx = mvec[block] >> 1;
334
            dy = mvec[block + 1] >> 1;
335
            block += 2;
336

    
337
            bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
338

    
339
            /* copy block - motion vectors out of bounds are used to zero blocks */
340
            out = output + x;
341
            tprev = prev + x + dx + dy * c->width;
342
            mx = x + dx;
343
            my = y + dy;
344
            for(j = 0; j < bh2; j++){
345
                if((my + j < 0) || (my + j >= c->height)) {
346
                    memset(out, 0, bw2 * 4);
347
                } else {
348
                    for(i = 0; i < bw2; i++){
349
                        if((mx + i < 0) || (mx + i >= c->width))
350
                            out[i] = 0;
351
                        else
352
                            out[i] = tprev[i];
353
                    }
354
                }
355
                out += c->width;
356
                tprev += c->width;
357
            }
358

    
359
            if(d) { /* apply XOR'ed difference */
360
                out = output + x;
361
                for(j = 0; j < bh2; j++){
362
                    for(i = 0; i < bw2; i++) {
363
                        out[i] ^= *((uint32_t*)src);
364
                        src += 4;
365
                    }
366
                    out += c->width;
367
                }
368
            }
369
        }
370
        output += c->width * c->bh;
371
        prev += c->width * c->bh;
372
    }
373
    if(src - c->decomp_buf != c->decomp_len)
374
        av_log(c->avctx, AV_LOG_ERROR, "Used %ti of %i bytes\n", src-c->decomp_buf, c->decomp_len);
375
    return 0;
376
}
377

    
378
/**
379
 * Decode intraframe
380
 */
381
static int zmbv_decode_intra(ZmbvContext *c)
382
{
383
    uint8_t *src = c->decomp_buf;
384

    
385
    /* make the palette available on the way out */
386
    if (c->fmt == ZMBV_FMT_8BPP) {
387
        memcpy(c->pal, src, 768);
388
        src += 768;
389
    }
390

    
391
    memcpy(c->cur, src, c->width * c->height * (c->bpp / 8));
392
    return 0;
393
}
394

    
395
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
396
{
397
    const uint8_t *buf = avpkt->data;
398
    int buf_size = avpkt->size;
399
    ZmbvContext * const c = avctx->priv_data;
400
    uint8_t *outptr;
401
    int zret = Z_OK; // Zlib return code
402
    int len = buf_size;
403
    int hi_ver, lo_ver;
404

    
405
    if(c->pic.data[0])
406
            avctx->release_buffer(avctx, &c->pic);
407

    
408
    c->pic.reference = 1;
409
    c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
410
    if(avctx->get_buffer(avctx, &c->pic) < 0){
411
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
412
        return -1;
413
    }
414

    
415
    outptr = c->pic.data[0]; // Output image pointer
416

    
417
    /* parse header */
418
    c->flags = buf[0];
419
    buf++; len--;
420
    if(c->flags & ZMBV_KEYFRAME) {
421
        hi_ver = buf[0];
422
        lo_ver = buf[1];
423
        c->comp = buf[2];
424
        c->fmt = buf[3];
425
        c->bw = buf[4];
426
        c->bh = buf[5];
427

    
428
        buf += 6;
429
        len -= 6;
430
        av_log(avctx, AV_LOG_DEBUG, "Flags=%X ver=%i.%i comp=%i fmt=%i blk=%ix%i\n",c->flags,hi_ver,lo_ver,c->comp,c->fmt,c->bw,c->bh);
431
        if(hi_ver != 0 || lo_ver != 1) {
432
            av_log(avctx, AV_LOG_ERROR, "Unsupported version %i.%i\n", hi_ver, lo_ver);
433
            return -1;
434
        }
435
        if(c->bw == 0 || c->bh == 0) {
436
            av_log(avctx, AV_LOG_ERROR, "Unsupported block size %ix%i\n", c->bw, c->bh);
437
        }
438
        if(c->comp != 0 && c->comp != 1) {
439
            av_log(avctx, AV_LOG_ERROR, "Unsupported compression type %i\n", c->comp);
440
            return -1;
441
        }
442

    
443
        switch(c->fmt) {
444
        case ZMBV_FMT_8BPP:
445
            c->bpp = 8;
446
            c->decode_intra = zmbv_decode_intra;
447
            c->decode_xor = zmbv_decode_xor_8;
448
            break;
449
        case ZMBV_FMT_15BPP:
450
        case ZMBV_FMT_16BPP:
451
            c->bpp = 16;
452
            c->decode_intra = zmbv_decode_intra;
453
            c->decode_xor = zmbv_decode_xor_16;
454
            break;
455
#ifdef ZMBV_ENABLE_24BPP
456
        case ZMBV_FMT_24BPP:
457
            c->bpp = 24;
458
            c->decode_intra = zmbv_decode_intra;
459
            c->decode_xor = zmbv_decode_xor_24;
460
            break;
461
#endif //ZMBV_ENABLE_24BPP
462
        case ZMBV_FMT_32BPP:
463
            c->bpp = 32;
464
            c->decode_intra = zmbv_decode_intra;
465
            c->decode_xor = zmbv_decode_xor_32;
466
            break;
467
        default:
468
            c->decode_intra = NULL;
469
            c->decode_xor = NULL;
470
            av_log(avctx, AV_LOG_ERROR, "Unsupported (for now) format %i\n", c->fmt);
471
            return -1;
472
        }
473

    
474
        zret = inflateReset(&c->zstream);
475
        if (zret != Z_OK) {
476
            av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
477
            return -1;
478
        }
479

    
480
        c->cur = av_realloc(c->cur, avctx->width * avctx->height * (c->bpp / 8));
481
        c->prev = av_realloc(c->prev, avctx->width * avctx->height * (c->bpp / 8));
482
        c->bx = (c->width + c->bw - 1) / c->bw;
483
        c->by = (c->height+ c->bh - 1) / c->bh;
484
    }
485

    
486
    if(c->decode_intra == NULL) {
487
        av_log(avctx, AV_LOG_ERROR, "Error! Got no format or no keyframe!\n");
488
        return -1;
489
    }
490

    
491
    if(c->comp == 0) { //Uncompressed data
492
        memcpy(c->decomp_buf, buf, len);
493
        c->decomp_size = 1;
494
    } else { // ZLIB-compressed data
495
        c->zstream.total_in = c->zstream.total_out = 0;
496
        c->zstream.next_in = buf;
497
        c->zstream.avail_in = len;
498
        c->zstream.next_out = c->decomp_buf;
499
        c->zstream.avail_out = c->decomp_size;
500
        inflate(&c->zstream, Z_FINISH);
501
        c->decomp_len = c->zstream.total_out;
502
    }
503
    if(c->flags & ZMBV_KEYFRAME) {
504
        c->pic.key_frame = 1;
505
        c->pic.pict_type = FF_I_TYPE;
506
        c->decode_intra(c);
507
    } else {
508
        c->pic.key_frame = 0;
509
        c->pic.pict_type = FF_P_TYPE;
510
        if(c->decomp_len)
511
            c->decode_xor(c);
512
    }
513

    
514
    /* update frames */
515
    {
516
        uint8_t *out, *src;
517
        int i, j;
518

    
519
        out = c->pic.data[0];
520
        src = c->cur;
521
        switch(c->fmt) {
522
        case ZMBV_FMT_8BPP:
523
            for(j = 0; j < c->height; j++) {
524
                for(i = 0; i < c->width; i++) {
525
                    out[i * 3 + 0] = c->pal[(*src) * 3 + 0];
526
                    out[i * 3 + 1] = c->pal[(*src) * 3 + 1];
527
                    out[i * 3 + 2] = c->pal[(*src) * 3 + 2];
528
                    src++;
529
                }
530
                out += c->pic.linesize[0];
531
            }
532
            break;
533
        case ZMBV_FMT_15BPP:
534
            for(j = 0; j < c->height; j++) {
535
                for(i = 0; i < c->width; i++) {
536
                    uint16_t tmp = AV_RL16(src);
537
                    src += 2;
538
                    out[i * 3 + 0] = (tmp & 0x7C00) >> 7;
539
                    out[i * 3 + 1] = (tmp & 0x03E0) >> 2;
540
                    out[i * 3 + 2] = (tmp & 0x001F) << 3;
541
                }
542
                out += c->pic.linesize[0];
543
            }
544
            break;
545
        case ZMBV_FMT_16BPP:
546
            for(j = 0; j < c->height; j++) {
547
                for(i = 0; i < c->width; i++) {
548
                    uint16_t tmp = AV_RL16(src);
549
                    src += 2;
550
                    out[i * 3 + 0] = (tmp & 0xF800) >> 8;
551
                    out[i * 3 + 1] = (tmp & 0x07E0) >> 3;
552
                    out[i * 3 + 2] = (tmp & 0x001F) << 3;
553
                }
554
                out += c->pic.linesize[0];
555
            }
556
            break;
557
#ifdef ZMBV_ENABLE_24BPP
558
        case ZMBV_FMT_24BPP:
559
            for(j = 0; j < c->height; j++) {
560
                memcpy(out, src, c->width * 3);
561
                src += c->width * 3;
562
                out += c->pic.linesize[0];
563
            }
564
            break;
565
#endif //ZMBV_ENABLE_24BPP
566
        case ZMBV_FMT_32BPP:
567
            for(j = 0; j < c->height; j++) {
568
                for(i = 0; i < c->width; i++) {
569
                    uint32_t tmp = AV_RL32(src);
570
                    src += 4;
571
                    AV_WB24(out+(i*3), tmp);
572
                }
573
                out += c->pic.linesize[0];
574
            }
575
            break;
576
        default:
577
            av_log(avctx, AV_LOG_ERROR, "Cannot handle format %i\n", c->fmt);
578
        }
579
        memcpy(c->prev, c->cur, c->width * c->height * (c->bpp / 8));
580
    }
581
    *data_size = sizeof(AVFrame);
582
    *(AVFrame*)data = c->pic;
583

    
584
    /* always report that the buffer was completely consumed */
585
    return buf_size;
586
}
587

    
588

    
589

    
590
/*
591
 *
592
 * Init zmbv decoder
593
 *
594
 */
595
static av_cold int decode_init(AVCodecContext *avctx)
596
{
597
    ZmbvContext * const c = avctx->priv_data;
598
    int zret; // Zlib return code
599

    
600
    c->avctx = avctx;
601

    
602
    c->width = avctx->width;
603
    c->height = avctx->height;
604

    
605
    c->bpp = avctx->bits_per_coded_sample;
606

    
607
    // Needed if zlib unused or init aborted before inflateInit
608
    memset(&(c->zstream), 0, sizeof(z_stream));
609

    
610
    avctx->pix_fmt = PIX_FMT_RGB24;
611
    c->decomp_size = (avctx->width + 255) * 4 * (avctx->height + 64);
612

    
613
    /* Allocate decompression buffer */
614
    if (c->decomp_size) {
615
        if ((c->decomp_buf = av_malloc(c->decomp_size)) == NULL) {
616
            av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
617
            return 1;
618
        }
619
    }
620

    
621
    c->zstream.zalloc = Z_NULL;
622
    c->zstream.zfree = Z_NULL;
623
    c->zstream.opaque = Z_NULL;
624
    zret = inflateInit(&(c->zstream));
625
    if (zret != Z_OK) {
626
        av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
627
        return 1;
628
    }
629

    
630
    return 0;
631
}
632

    
633

    
634

    
635
/*
636
 *
637
 * Uninit zmbv decoder
638
 *
639
 */
640
static av_cold int decode_end(AVCodecContext *avctx)
641
{
642
    ZmbvContext * const c = avctx->priv_data;
643

    
644
    av_freep(&c->decomp_buf);
645

    
646
    if (c->pic.data[0])
647
        avctx->release_buffer(avctx, &c->pic);
648
    inflateEnd(&(c->zstream));
649
    av_freep(&c->cur);
650
    av_freep(&c->prev);
651

    
652
    return 0;
653
}
654

    
655
AVCodec zmbv_decoder = {
656
    "zmbv",
657
    AVMEDIA_TYPE_VIDEO,
658
    CODEC_ID_ZMBV,
659
    sizeof(ZmbvContext),
660
    decode_init,
661
    NULL,
662
    decode_end,
663
    decode_frame,
664
    CODEC_CAP_DR1,
665
    .long_name = NULL_IF_CONFIG_SMALL("Zip Motion Blocks Video"),
666
};
667