FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/zmbv.c
Date: 2026-04-30 23:37:26
Exec Total Coverage
Lines: 243 289 84.1%
Functions: 7 7 100.0%
Branches: 118 161 73.3%
Line Branch Exec Source
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 *
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 * @file
24 * Zip Motion Blocks Video decoder
25 */
26
27 #include <stddef.h>
28
29 #include "libavutil/attributes.h"
30 #include "libavutil/common.h"
31 #include "libavutil/imgutils.h"
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/mem.h"
34 #include "avcodec.h"
35 #include "codec_internal.h"
36 #include "decode.h"
37 #include "zlib_wrapper.h"
38
39 #include <zlib.h>
40
41 #define ZMBV_KEYFRAME 1
42 #define ZMBV_DELTAPAL 2
43
44 enum ZmbvFormat {
45 ZMBV_FMT_NONE = 0,
46 ZMBV_FMT_1BPP = 1,
47 ZMBV_FMT_2BPP = 2,
48 ZMBV_FMT_4BPP = 3,
49 ZMBV_FMT_8BPP = 4,
50 ZMBV_FMT_15BPP = 5,
51 ZMBV_FMT_16BPP = 6,
52 ZMBV_FMT_24BPP = 7,
53 ZMBV_FMT_32BPP = 8
54 };
55
56 /*
57 * Decoder context
58 */
59 typedef struct ZmbvContext {
60 AVCodecContext *avctx;
61
62 int bpp;
63 int alloc_bpp;
64 unsigned int decomp_size;
65 uint8_t* decomp_buf;
66 uint8_t pal[768];
67 uint8_t *prev, *cur;
68 int width, height;
69 int fmt;
70 int comp;
71 int flags;
72 int stride;
73 int bw, bh, bx, by;
74 int decomp_len;
75 int got_keyframe;
76 FFZStream zstream;
77 int (*decode_xor)(struct ZmbvContext *c);
78 } ZmbvContext;
79
80 /**
81 * Decode XOR'ed frame - 8bpp version
82 */
83
84 275 static int zmbv_decode_xor_8(ZmbvContext *c)
85 {
86 275 uint8_t *src = c->decomp_buf;
87 uint8_t *output, *prev;
88 int8_t *mvec;
89 int x, y;
90 int d, dx, dy, bw2, bh2;
91 int block;
92 int i, j;
93 int mx, my;
94
95 275 output = c->cur;
96 275 prev = c->prev;
97
98
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 275 times.
 275 if (c->flags & ZMBV_DELTAPAL) {
99 ✗ for (i = 0; i < 768; i++)
100 ✗ c->pal[i] ^= *src++;
101 }
102
103 275 mvec = (int8_t*)src;
104 275 src += ((c->bx * c->by * 2 + 3) & ~3);
105
106 275 block = 0;
107
2/2
✓ Branch 0 taken 3575 times.
✓ Branch 1 taken 275 times.
 3850 for (y = 0; y < c->height; y += c->bh) {
108 3575 bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
109
2/2
✓ Branch 0 taken 71500 times.
✓ Branch 1 taken 3575 times.
 75075 for (x = 0; x < c->width; x += c->bw) {
110 uint8_t *out, *tprev;
111
112 71500 d = mvec[block] & 1;
113 71500 dx = mvec[block] >> 1;
114 71500 dy = mvec[block + 1] >> 1;
115 71500 block += 2;
116
117 71500 bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
118
119 /* copy block - motion vectors out of bounds are used to zero blocks */
120 71500 out = output + x;
121 71500 tprev = prev + x + dx + dy * c->width;
122 71500 mx = x + dx;
123 71500 my = y + dy;
124
2/2
✓ Branch 0 taken 1100000 times.
✓ Branch 1 taken 71500 times.
 1171500 for (j = 0; j < bh2; j++) {
125
2/4
✓ Branch 0 taken 1100000 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 1100000 times.
 1100000 if (my + j < 0 || my + j >= c->height) {
126 ✗ memset(out, 0, bw2);
127
2/4
✓ Branch 0 taken 1100000 times.
✗ Branch 1 not taken.
✓ Branch 2 taken 1100000 times.
✗ Branch 3 not taken.
 1100000 } else if (mx >= 0 && mx + bw2 <= c->width){
128 1100000 memcpy(out, tprev, sizeof(*out) * bw2);
129 } else {
130 ✗ for (i = 0; i < bw2; i++) {
131 ✗ if (mx + i < 0 || mx + i >= c->width)
132 ✗ out[i] = 0;
133 else
134 ✗ out[i] = tprev[i];
135 }
136 }
137 1100000 out += c->width;
138 1100000 tprev += c->width;
139 }
140
141
2/2
✓ Branch 0 taken 1486 times.
✓ Branch 1 taken 70014 times.
 71500 if (d) { /* apply XOR'ed difference */
142 1486 out = output + x;
143
2/2
✓ Branch 0 taken 23776 times.
✓ Branch 1 taken 1486 times.
 25262 for (j = 0; j < bh2; j++) {
144
2/2
✓ Branch 0 taken 380416 times.
✓ Branch 1 taken 23776 times.
 404192 for (i = 0; i < bw2; i++)
145 380416 out[i] ^= *src++;
146 23776 out += c->width;
147 }
148 }
149 }
150 3575 output += c->width * c->bh;
151 3575 prev += c->width * c->bh;
152 }
153
2/2
✓ Branch 0 taken 1 times.
✓ Branch 1 taken 274 times.
 275 if (src - c->decomp_buf != c->decomp_len)
154 1 av_log(c->avctx, AV_LOG_ERROR, "Used %td of %i bytes\n",
155 1 src-c->decomp_buf, c->decomp_len);
156 275 return 0;
157 }
158
159 /**
160 * Decode XOR'ed frame - 15bpp and 16bpp version
161 */
162
163 323 static int zmbv_decode_xor_16(ZmbvContext *c)
164 {
165 323 uint8_t *src = c->decomp_buf;
166 uint16_t *output, *prev;
167 int8_t *mvec;
168 int x, y;
169 int d, dx, dy, bw2, bh2;
170 int block;
171 int i, j;
172 int mx, my;
173
174 323 output = (uint16_t*)c->cur;
175 323 prev = (uint16_t*)c->prev;
176
177 323 mvec = (int8_t*)src;
178 323 src += ((c->bx * c->by * 2 + 3) & ~3);
179
180 323 block = 0;
181
2/2
✓ Branch 0 taken 4199 times.
✓ Branch 1 taken 323 times.
 4522 for (y = 0; y < c->height; y += c->bh) {
182 4199 bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
183
2/2
✓ Branch 0 taken 83980 times.
✓ Branch 1 taken 4199 times.
 88179 for (x = 0; x < c->width; x += c->bw) {
184 uint16_t *out, *tprev;
185
186 83980 d = mvec[block] & 1;
187 83980 dx = mvec[block] >> 1;
188 83980 dy = mvec[block + 1] >> 1;
189 83980 block += 2;
190
191 83980 bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
192
193 /* copy block - motion vectors out of bounds are used to zero blocks */
194 83980 out = output + x;
195 83980 tprev = prev + x + dx + dy * c->width;
196 83980 mx = x + dx;
197 83980 my = y + dy;
198
2/2
✓ Branch 0 taken 1292000 times.
✓ Branch 1 taken 83980 times.
 1375980 for (j = 0; j < bh2; j++) {
199
4/4
✓ Branch 0 taken 1291985 times.
✓ Branch 1 taken 15 times.
✓ Branch 2 taken 320 times.
✓ Branch 3 taken 1291665 times.
 1292000 if (my + j < 0 || my + j >= c->height) {
200 335 memset(out, 0, bw2 * 2);
201
4/4
✓ Branch 0 taken 1291633 times.
✓ Branch 1 taken 32 times.
✓ Branch 2 taken 1291577 times.
✓ Branch 3 taken 56 times.
 1291665 } else if (mx >= 0 && mx + bw2 <= c->width){
202 1291577 memcpy(out, tprev, sizeof(*out) * bw2);
203 } else {
204
2/2
✓ Branch 0 taken 1408 times.
✓ Branch 1 taken 88 times.
 1496 for (i = 0; i < bw2; i++) {
205
4/4
✓ Branch 0 taken 1264 times.
✓ Branch 1 taken 144 times.
✓ Branch 2 taken 160 times.
✓ Branch 3 taken 1104 times.
 1408 if (mx + i < 0 || mx + i >= c->width)
206 304 out[i] = 0;
207 else
208 1104 out[i] = tprev[i];
209 }
210 }
211 1292000 out += c->width;
212 1292000 tprev += c->width;
213 }
214
215
2/2
✓ Branch 0 taken 7935 times.
✓ Branch 1 taken 76045 times.
 83980 if (d) { /* apply XOR'ed difference */
216 7935 out = output + x;
217
2/2
✓ Branch 0 taken 123312 times.
✓ Branch 1 taken 7935 times.
 131247 for (j = 0; j < bh2; j++){
218
2/2
✓ Branch 0 taken 1972992 times.
✓ Branch 1 taken 123312 times.
 2096304 for (i = 0; i < bw2; i++) {
219 1972992 out[i] ^= *((uint16_t*)src);
220 1972992 src += 2;
221 }
222 123312 out += c->width;
223 }
224 }
225 }
226 4199 output += c->width * c->bh;
227 4199 prev += c->width * c->bh;
228 }
229
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 323 times.
 323 if (src - c->decomp_buf != c->decomp_len)
230 ✗ av_log(c->avctx, AV_LOG_ERROR, "Used %td of %i bytes\n",
231 ✗ src-c->decomp_buf, c->decomp_len);
232 323 return 0;
233 }
234
235 #ifdef ZMBV_ENABLE_24BPP
236 /**
237 * Decode XOR'ed frame - 24bpp version
238 */
239
240 static int zmbv_decode_xor_24(ZmbvContext *c)
241 {
242 uint8_t *src = c->decomp_buf;
243 uint8_t *output, *prev;
244 int8_t *mvec;
245 int x, y;
246 int d, dx, dy, bw2, bh2;
247 int block;
248 int i, j;
249 int mx, my;
250 int stride;
251
252 output = c->cur;
253 prev = c->prev;
254
255 stride = c->width * 3;
256 mvec = (int8_t*)src;
257 src += ((c->bx * c->by * 2 + 3) & ~3);
258
259 block = 0;
260 for (y = 0; y < c->height; y += c->bh) {
261 bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
262 for (x = 0; x < c->width; x += c->bw) {
263 uint8_t *out, *tprev;
264
265 d = mvec[block] & 1;
266 dx = mvec[block] >> 1;
267 dy = mvec[block + 1] >> 1;
268 block += 2;
269
270 bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
271
272 /* copy block - motion vectors out of bounds are used to zero blocks */
273 out = output + x * 3;
274 tprev = prev + (x + dx) * 3 + dy * stride;
275 mx = x + dx;
276 my = y + dy;
277 for (j = 0; j < bh2; j++) {
278 if (my + j < 0 || my + j >= c->height) {
279 memset(out, 0, bw2 * 3);
280 } else if (mx >= 0 && mx + bw2 <= c->width){
281 memcpy(out, tprev, 3 * bw2);
282 } else {
283 for (i = 0; i < bw2; i++){
284 if (mx + i < 0 || mx + i >= c->width) {
285 out[i * 3 + 0] = 0;
286 out[i * 3 + 1] = 0;
287 out[i * 3 + 2] = 0;
288 } else {
289 out[i * 3 + 0] = tprev[i * 3 + 0];
290 out[i * 3 + 1] = tprev[i * 3 + 1];
291 out[i * 3 + 2] = tprev[i * 3 + 2];
292 }
293 }
294 }
295 out += stride;
296 tprev += stride;
297 }
298
299 if (d) { /* apply XOR'ed difference */
300 out = output + x * 3;
301 for (j = 0; j < bh2; j++) {
302 for (i = 0; i < bw2; i++) {
303 out[i * 3 + 0] ^= *src++;
304 out[i * 3 + 1] ^= *src++;
305 out[i * 3 + 2] ^= *src++;
306 }
307 out += stride;
308 }
309 }
310 }
311 output += stride * c->bh;
312 prev += stride * c->bh;
313 }
314 if (src - c->decomp_buf != c->decomp_len)
315 av_log(c->avctx, AV_LOG_ERROR, "Used %td of %i bytes\n",
316 src-c->decomp_buf, c->decomp_len);
317 return 0;
318 }
319 #endif //ZMBV_ENABLE_24BPP
320
321 /**
322 * Decode XOR'ed frame - 32bpp version
323 */
324
325 162 static int zmbv_decode_xor_32(ZmbvContext *c)
326 {
327 162 uint8_t *src = c->decomp_buf;
328 uint32_t *output, *prev;
329 int8_t *mvec;
330 int x, y;
331 int d, dx, dy, bw2, bh2;
332 int block;
333 int i, j;
334 int mx, my;
335
336 162 output = (uint32_t*)c->cur;
337 162 prev = (uint32_t*)c->prev;
338
339 162 mvec = (int8_t*)src;
340 162 src += ((c->bx * c->by * 2 + 3) & ~3);
341
342 162 block = 0;
343
2/2
✓ Branch 0 taken 2106 times.
✓ Branch 1 taken 162 times.
 2268 for (y = 0; y < c->height; y += c->bh) {
344 2106 bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y);
345
2/2
✓ Branch 0 taken 42120 times.
✓ Branch 1 taken 2106 times.
 44226 for (x = 0; x < c->width; x += c->bw) {
346 uint32_t *out, *tprev;
347
348 42120 d = mvec[block] & 1;
349 42120 dx = mvec[block] >> 1;
350 42120 dy = mvec[block + 1] >> 1;
351 42120 block += 2;
352
353 42120 bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x);
354
355 /* copy block - motion vectors out of bounds are used to zero blocks */
356 42120 out = output + x;
357 42120 tprev = prev + x + dx + dy * c->width;
358 42120 mx = x + dx;
359 42120 my = y + dy;
360
2/2
✓ Branch 0 taken 648000 times.
✓ Branch 1 taken 42120 times.
 690120 for (j = 0; j < bh2; j++) {
361
4/4
✓ Branch 0 taken 647984 times.
✓ Branch 1 taken 16 times.
✓ Branch 2 taken 160 times.
✓ Branch 3 taken 647824 times.
 648000 if (my + j < 0 || my + j >= c->height) {
362 176 memset(out, 0, bw2 * 4);
363
4/4
✓ Branch 0 taken 647792 times.
✓ Branch 1 taken 32 times.
✓ Branch 2 taken 647760 times.
✓ Branch 3 taken 32 times.
 647824 } else if (mx >= 0 && mx + bw2 <= c->width){
364 647760 memcpy(out, tprev, sizeof(*out) * bw2);
365 } else {
366
2/2
✓ Branch 0 taken 1024 times.
✓ Branch 1 taken 64 times.
 1088 for (i = 0; i < bw2; i++){
367
4/4
✓ Branch 0 taken 880 times.
✓ Branch 1 taken 144 times.
✓ Branch 2 taken 112 times.
✓ Branch 3 taken 768 times.
 1024 if (mx + i < 0 || mx + i >= c->width)
368 256 out[i] = 0;
369 else
370 768 out[i] = tprev[i];
371 }
372 }
373 648000 out += c->width;
374 648000 tprev += c->width;
375 }
376
377
2/2
✓ Branch 0 taken 4451 times.
✓ Branch 1 taken 37669 times.
 42120 if (d) { /* apply XOR'ed difference */
378 4451 out = output + x;
379
2/2
✓ Branch 0 taken 69136 times.
✓ Branch 1 taken 4451 times.
 73587 for (j = 0; j < bh2; j++){
380
2/2
✓ Branch 0 taken 1106176 times.
✓ Branch 1 taken 69136 times.
 1175312 for (i = 0; i < bw2; i++) {
381 1106176 out[i] ^= *((uint32_t *) src);
382 1106176 src += 4;
383 }
384 69136 out += c->width;
385 }
386 }
387 }
388 2106 output += c->width * c->bh;
389 2106 prev += c->width * c->bh;
390 }
391
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 162 times.
 162 if (src - c->decomp_buf != c->decomp_len)
392 ✗ av_log(c->avctx, AV_LOG_ERROR, "Used %td of %i bytes\n",
393 ✗ src-c->decomp_buf, c->decomp_len);
394 162 return 0;
395 }
396
397 /**
398 * Decode intraframe
399 */
400 8 static int zmbv_decode_intra(ZmbvContext *c)
401 {
402 8 uint8_t *src = c->decomp_buf;
403
404 /* make the palette available on the way out */
405
2/2
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 6 times.
 8 if (c->fmt == ZMBV_FMT_8BPP) {
406 2 memcpy(c->pal, src, 768);
407 2 src += 768;
408 }
409
410 8 memcpy(c->cur, src, c->width * c->height * (c->bpp / 8));
411 8 return 0;
412 }
413
414 768 static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
415 int *got_frame, AVPacket *avpkt)
416 {
417 768 const uint8_t *buf = avpkt->data;
418 768 int buf_size = avpkt->size;
419 768 ZmbvContext * const c = avctx->priv_data;
420 768 int zret = Z_OK; // Zlib return code
421 768 int len = buf_size;
422 int hi_ver, lo_ver, ret;
423 int expected_size;
424
425 /* parse header */
426
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 768 times.
 768 if (len < 1)
427 ✗ return AVERROR_INVALIDDATA;
428 768 c->flags = buf[0];
429 768 buf++; len--;
430
2/2
✓ Branch 0 taken 8 times.
✓ Branch 1 taken 760 times.
 768 if (c->flags & ZMBV_KEYFRAME) {
431 8 c->got_keyframe = 0;
432
433
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 8 times.
 8 if (len < 6)
434 ✗ return AVERROR_INVALIDDATA;
435 8 hi_ver = buf[0];
436 8 lo_ver = buf[1];
437 8 c->comp = buf[2];
438 8 c->fmt = buf[3];
439 8 c->bw = buf[4];
440 8 c->bh = buf[5];
441 8 c->decode_xor = NULL;
442
443 8 buf += 6;
444 8 len -= 6;
445 8 av_log(avctx, AV_LOG_DEBUG,
446 "Flags=%X ver=%i.%i comp=%i fmt=%i blk=%ix%i\n",
447 c->flags,hi_ver,lo_ver,c->comp,c->fmt,c->bw,c->bh);
448
2/4
✓ Branch 0 taken 8 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 8 times.
 8 if (hi_ver != 0 || lo_ver != 1) {
449 ✗ avpriv_request_sample(avctx, "Version %i.%i", hi_ver, lo_ver);
450 ✗ return AVERROR_PATCHWELCOME;
451 }
452
2/4
✓ Branch 0 taken 8 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 8 times.
 8 if (c->bw == 0 || c->bh == 0) {
453 ✗ avpriv_request_sample(avctx, "Block size %ix%i", c->bw, c->bh);
454 ✗ return AVERROR_PATCHWELCOME;
455 }
456
2/4
✓ Branch 0 taken 8 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 8 times.
 8 if (c->comp != 0 && c->comp != 1) {
457 ✗ avpriv_request_sample(avctx, "Compression type %i", c->comp);
458 ✗ return AVERROR_PATCHWELCOME;
459 }
460
461
3/4
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 4 times.
✓ Branch 2 taken 2 times.
✗ Branch 3 not taken.
 8 switch (c->fmt) {
462 2 case ZMBV_FMT_8BPP:
463 2 c->bpp = 8;
464 2 c->decode_xor = zmbv_decode_xor_8;
465 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
466 2 c->stride = c->width;
467 2 break;
468 4 case ZMBV_FMT_15BPP:
469 case ZMBV_FMT_16BPP:
470 4 c->bpp = 16;
471 4 c->decode_xor = zmbv_decode_xor_16;
472
2/2
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 2 times.
 4 if (c->fmt == ZMBV_FMT_15BPP)
473 2 avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
474 else
475 2 avctx->pix_fmt = AV_PIX_FMT_RGB565LE;
476 4 c->stride = c->width * 2;
477 4 break;
478 #ifdef ZMBV_ENABLE_24BPP
479 case ZMBV_FMT_24BPP:
480 c->bpp = 24;
481 c->decode_xor = zmbv_decode_xor_24;
482 avctx->pix_fmt = AV_PIX_FMT_BGR24;
483 c->stride = c->width * 3;
484 break;
485 #endif //ZMBV_ENABLE_24BPP
486 2 case ZMBV_FMT_32BPP:
487 2 c->bpp = 32;
488 2 c->decode_xor = zmbv_decode_xor_32;
489 2 avctx->pix_fmt = AV_PIX_FMT_BGR0;
490 2 c->stride = c->width * 4;
491 2 break;
492 ✗ default:
493 ✗ c->decode_xor = NULL;
494 ✗ avpriv_request_sample(avctx, "Format %i", c->fmt);
495 ✗ return AVERROR_PATCHWELCOME;
496 }
497
498 8 zret = inflateReset(&c->zstream.zstream);
499
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 8 times.
 8 if (zret != Z_OK) {
500 ✗ av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
501 ✗ return AVERROR_UNKNOWN;
502 }
503
504
1/2
✓ Branch 0 taken 8 times.
✗ Branch 1 not taken.
 8 if (c->alloc_bpp < c->bpp) {
505 8 c->cur = av_realloc_f(c->cur, avctx->width * avctx->height, (c->bpp / 8));
506 8 c->prev = av_realloc_f(c->prev, avctx->width * avctx->height, (c->bpp / 8));
507 8 c->alloc_bpp = c->bpp;
508 }
509 8 c->bx = (c->width + c->bw - 1) / c->bw;
510 8 c->by = (c->height+ c->bh - 1) / c->bh;
511
2/4
✓ Branch 0 taken 8 times.
✗ Branch 1 not taken.
✗ Branch 2 not taken.
✓ Branch 3 taken 8 times.
 8 if (!c->cur || !c->prev) {
512 ✗ c->alloc_bpp = 0;
513 ✗ return AVERROR(ENOMEM);
514 }
515 8 memset(c->cur, 0, avctx->width * avctx->height * (c->bpp / 8));
516 8 memset(c->prev, 0, avctx->width * avctx->height * (c->bpp / 8));
517 8 c->got_keyframe = 1;
518 }
519
2/2
✓ Branch 0 taken 8 times.
✓ Branch 1 taken 760 times.
 768 if (c->flags & ZMBV_KEYFRAME) {
520 8 expected_size = avctx->width * avctx->height * (c->bpp / 8);
521 } else {
522 760 expected_size = (c->bx * c->by * 2 + 3) & ~3;
523 }
524
2/2
✓ Branch 0 taken 277 times.
✓ Branch 1 taken 491 times.
 768 if (avctx->pix_fmt == AV_PIX_FMT_PAL8 &&
525
2/2
✓ Branch 0 taken 2 times.
✓ Branch 1 taken 275 times.
 277 (c->flags & (ZMBV_DELTAPAL | ZMBV_KEYFRAME)))
526 2 expected_size += 768;
527
528
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 768 times.
 768 if (!c->got_keyframe) {
529 ✗ av_log(avctx, AV_LOG_ERROR, "Error! Got no format or no keyframe!\n");
530 ✗ return AVERROR_INVALIDDATA;
531 }
532
533
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 768 times.
 768 if (c->comp == 0) { // uncompressed data
534 ✗ if (c->decomp_size < len) {
535 ✗ av_log(avctx, AV_LOG_ERROR, "Buffer too small\n");
536 ✗ return AVERROR_INVALIDDATA;
537 }
538 ✗ memcpy(c->decomp_buf, buf, len);
539 ✗ c->decomp_len = len;
540 } else { // ZLIB-compressed data
541 768 z_stream *const zstream = &c->zstream.zstream;
542
543 768 zstream->total_in = zstream->total_out = 0;
544 768 zstream->next_in = buf;
545 768 zstream->avail_in = len;
546 768 zstream->next_out = c->decomp_buf;
547 768 zstream->avail_out = c->decomp_size;
548 768 zret = inflate(zstream, Z_SYNC_FLUSH);
549
1/4
✗ Branch 0 not taken.
✓ Branch 1 taken 768 times.
✗ Branch 2 not taken.
✗ Branch 3 not taken.
 768 if (zret != Z_OK && zret != Z_STREAM_END) {
550 ✗ av_log(avctx, AV_LOG_ERROR, "inflate error %d\n", zret);
551 ✗ return AVERROR_INVALIDDATA;
552 }
553 768 c->decomp_len = zstream->total_out;
554 }
555
1/2
✓ Branch 0 taken 768 times.
✗ Branch 1 not taken.
 768 if (expected_size > c->decomp_len ||
556
3/4
✓ Branch 0 taken 8 times.
✓ Branch 1 taken 760 times.
✗ Branch 2 not taken.
✓ Branch 3 taken 8 times.
 768 (c->flags & ZMBV_KEYFRAME) && expected_size < c->decomp_len) {
557 ✗ av_log(avctx, AV_LOG_ERROR, "decompressed size %d is incorrect, expected %d\n", c->decomp_len, expected_size);
558 ✗ return AVERROR_INVALIDDATA;
559 }
560
1/2
✗ Branch 1 not taken.
✓ Branch 2 taken 768 times.
 768 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
561 ✗ return ret;
562
563
2/2
✓ Branch 0 taken 8 times.
✓ Branch 1 taken 760 times.
 768 if (c->flags & ZMBV_KEYFRAME) {
564 8 frame->flags |= AV_FRAME_FLAG_KEY;
565 8 frame->pict_type = AV_PICTURE_TYPE_I;
566 8 zmbv_decode_intra(c);
567 } else {
568 760 frame->flags &= ~AV_FRAME_FLAG_KEY;
569 760 frame->pict_type = AV_PICTURE_TYPE_P;
570
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 760 times.
 760 if (c->decomp_len < 2LL * ((c->width + c->bw - 1) / c->bw) * ((c->height + c->bh - 1) / c->bh))
571 ✗ return AVERROR_INVALIDDATA;
572
1/2
✓ Branch 0 taken 760 times.
✗ Branch 1 not taken.
 760 if (c->decomp_len)
573 760 c->decode_xor(c);
574 }
575
576 /* update frames */
577 {
578 uint8_t *out, *src;
579 int j;
580
581 768 out = frame->data[0];
582 768 src = c->cur;
583
2/3
✓ Branch 0 taken 277 times.
✓ Branch 1 taken 491 times.
✗ Branch 2 not taken.
 768 switch (c->fmt) {
584 277 case ZMBV_FMT_8BPP:
585
2/2
✓ Branch 0 taken 70912 times.
✓ Branch 1 taken 277 times.
 71189 for (j = 0; j < 256; j++)
586 70912 AV_WN32(&frame->data[1][j * 4], 0xFFU << 24 | AV_RB24(&c->pal[j * 3]));
587 av_fallthrough;
588 case ZMBV_FMT_15BPP:
589 case ZMBV_FMT_16BPP:
590 #ifdef ZMBV_ENABLE_24BPP
591 case ZMBV_FMT_24BPP:
592 #endif
593 case ZMBV_FMT_32BPP:
594 768 av_image_copy_plane(out, frame->linesize[0], src, c->stride,
595 c->stride, c->height);
596 768 break;
597 ✗ default:
598 ✗ av_log(avctx, AV_LOG_ERROR, "Cannot handle format %i\n", c->fmt);
599 }
600 768 FFSWAP(uint8_t *, c->cur, c->prev);
601 }
602 768 *got_frame = 1;
603
604 /* always report that the buffer was completely consumed */
605 768 return buf_size;
606 }
607
608 8 static av_cold int decode_init(AVCodecContext *avctx)
609 {
610 8 ZmbvContext * const c = avctx->priv_data;
611
612 8 c->avctx = avctx;
613
614 8 c->width = avctx->width;
615 8 c->height = avctx->height;
616
617 8 c->bpp = avctx->bits_per_coded_sample;
618
619
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 8 times.
 8 if ((avctx->width + 255ULL) * (avctx->height + 64ULL) > FFMIN(avctx->max_pixels, INT_MAX / 4) ) {
620 ✗ av_log(avctx, AV_LOG_ERROR, "Internal buffer (decomp_size) larger than max_pixels or too large\n");
621 ✗ return AVERROR_INVALIDDATA;
622 }
623
624 8 c->decomp_size = (avctx->width + 255) * 4 * (avctx->height + 64);
625
626 /* Allocate decompression buffer */
627 8 c->decomp_buf = av_mallocz(c->decomp_size);
628
1/2
✗ Branch 0 not taken.
✓ Branch 1 taken 8 times.
 8 if (!c->decomp_buf) {
629 ✗ av_log(avctx, AV_LOG_ERROR,
630 "Can't allocate decompression buffer.\n");
631 ✗ return AVERROR(ENOMEM);
632 }
633
634 8 return ff_inflate_init(&c->zstream, avctx);
635 }
636
637 8 static av_cold int decode_end(AVCodecContext *avctx)
638 {
639 8 ZmbvContext * const c = avctx->priv_data;
640
641 8 av_freep(&c->decomp_buf);
642
643 8 av_freep(&c->cur);
644 8 av_freep(&c->prev);
645 8 ff_inflate_end(&c->zstream);
646
647 8 return 0;
648 }
649
650 const FFCodec ff_zmbv_decoder = {
651 .p.name = "zmbv",
652 CODEC_LONG_NAME("Zip Motion Blocks Video"),
653 .p.type = AVMEDIA_TYPE_VIDEO,
654 .p.id = AV_CODEC_ID_ZMBV,
655 .priv_data_size = sizeof(ZmbvContext),
656 .init = decode_init,
657 .close = decode_end,
658 FF_CODEC_DECODE_CB(decode_frame),
659 .p.capabilities = AV_CODEC_CAP_DR1,
660 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
661 };
662