FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/dxa.c
Date: 2024-04-19 07:31:02
Exec Total Coverage
Lines: 185 219 84.5%
Functions: 4 4 100.0%
Branches: 90 121 74.4%
Line Branch Exec Source
1 /*
2 * Feeble Files/ScummVM DXA decoder
3 * Copyright (c) 2007 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 * DXA Video decoder
25 */
26
27 #include "libavutil/intreadwrite.h"
28 #include "libavutil/mem.h"
29 #include "bytestream.h"
30 #include "avcodec.h"
31 #include "codec_internal.h"
32 #include "decode.h"
33
34 #include <zlib.h>
35
36 /*
37 * Decoder context
38 */
39 typedef struct DxaDecContext {
40 AVFrame *prev;
41
42 int dsize;
43 #define DECOMP_BUF_PADDING 16
44 uint8_t *decomp_buf;
45 uint32_t pal[256];
46 } DxaDecContext;
47
48 static const uint8_t shift1[6] = { 0, 8, 8, 8, 4, 4 };
49 static const uint8_t shift2[6] = { 0, 0, 8, 4, 0, 4 };
50
51 5 static int decode_13(AVCodecContext *avctx, DxaDecContext *c, uint8_t* dst,
52 int stride, uint8_t *src, int srcsize, uint8_t *ref)
53 {
54 uint8_t *code, *data, *mv, *msk, *tmp, *tmp2;
55 5 uint8_t *src_end = src + srcsize;
56 int i, j, k;
57 int type, x, y, d, d2;
58 uint32_t mask;
59
60
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 5 if (12ULL + ((avctx->width * avctx->height) >> 4) + AV_RB32(src + 0) + AV_RB32(src + 4) > srcsize)
61 ✗ return AVERROR_INVALIDDATA;
62
63 5 code = src + 12;
64 5 data = code + ((avctx->width * avctx->height) >> 4);
65 5 mv = data + AV_RB32(src + 0);
66 5 msk = mv + AV_RB32(src + 4);
67
68
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 255 for(j = 0; j < avctx->height; j += 4){
69
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 40000 if (data > src_end || mv > src_end || msk > src_end)
71 ✗ return AVERROR_INVALIDDATA;
72 40000 tmp = dst + i;
73 40000 tmp2 = ref + i;
74 40000 type = *code++;
75
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 40000 switch(type){
76 227 case 4: // motion compensation
77
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 227 x = (*mv) >> 4; if(x & 8) x = 8 - x;
78
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 227 y = (*mv++) & 0xF; if(y & 8) y = 8 - y;
79
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 227 if (i < -x || avctx->width - i - 4 < x ||
80
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 227 j < -y || avctx->height - j - 4 < y) {
81 ✗ av_log(avctx, AV_LOG_ERROR, "MV %d %d out of bounds\n", x,y);
82 ✗ return AVERROR_INVALIDDATA;
83 }
84 227 tmp2 += x + y*stride;
85 26615 case 0: // skip
86 case 5: // skip in method 12
87
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 133075 for(y = 0; y < 4; y++){
88 106460 memcpy(tmp, tmp2, 4);
89 106460 tmp += stride;
90 106460 tmp2 += stride;
91 }
92 26615 break;
93 326 case 1: // masked change
94 case 10: // masked change with only half of pixels changed
95 case 11: // cases 10-15 are for method 12 only
96 case 12:
97 case 13:
98 case 14:
99 case 15:
100
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 326 if(type == 1){
101 326 mask = AV_RB16(msk);
102 326 msk += 2;
103 }else{
104 ✗ type -= 10;
105 ✗ mask = ((msk[0] & 0xF0) << shift1[type]) | ((msk[0] & 0xF) << shift2[type]);
106 ✗ msk++;
107 }
108
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 5216 tmp[x] = (mask & 0x8000) ? *data++ : tmp2[x];
111 5216 mask <<= 1;
112 }
113 1304 tmp += stride;
114 1304 tmp2 += stride;
115 }
116 326 break;
117 2428 case 2: // fill block
118
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 12140 for(y = 0; y < 4; y++){
119 9712 memset(tmp, data[0], 4);
120 9712 tmp += stride;
121 }
122 2428 data++;
123 2428 break;
124 705 case 3: // raw block
125
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 3525 for(y = 0; y < 4; y++){
126 2820 memcpy(tmp, data, 4);
127 2820 data += 4;
128 2820 tmp += stride;
129 }
130 705 break;
131 681 case 8: // subblocks - method 13 only
132 681 mask = *msk++;
133
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 3405 for(k = 0; k < 4; k++){
134 2724 d = ((k & 1) << 1) + ((k & 2) * stride);
135 2724 d2 = ((k & 1) << 1) + ((k & 2) * stride);
136 2724 tmp2 = ref + i + d2;
137
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 2724 switch(mask & 0xC0){
138 361 case 0x80: // motion compensation
139
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 361 x = (*mv) >> 4; if(x & 8) x = 8 - x;
140
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 361 y = (*mv++) & 0xF; if(y & 8) y = 8 - y;
141
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 361 if (i + 2*(k & 1) < -x || avctx->width - i - 2*(k & 1) - 2 < x ||
142
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 361 j + (k & 2) < -y || avctx->height - j - (k & 2) - 2 < y) {
143 ✗ av_log(avctx, AV_LOG_ERROR, "MV %d %d out of bounds\n", x,y);
144 ✗ return AVERROR_INVALIDDATA;
145 }
146 361 tmp2 += x + y*stride;
147 1446 case 0x00: // skip
148 1446 tmp[d + 0 ] = tmp2[0];
149 1446 tmp[d + 1 ] = tmp2[1];
150 1446 tmp[d + 0 + stride] = tmp2[0 + stride];
151 1446 tmp[d + 1 + stride] = tmp2[1 + stride];
152 1446 break;
153 696 case 0x40: // fill
154 696 tmp[d + 0 ] = data[0];
155 696 tmp[d + 1 ] = data[0];
156 696 tmp[d + 0 + stride] = data[0];
157 696 tmp[d + 1 + stride] = data[0];
158 696 data++;
159 696 break;
160 582 case 0xC0: // raw
161 582 tmp[d + 0 ] = *data++;
162 582 tmp[d + 1 ] = *data++;
163 582 tmp[d + 0 + stride] = *data++;
164 582 tmp[d + 1 + stride] = *data++;
165 582 break;
166 }
167 2724 mask <<= 2;
168 }
169 681 break;
170 9229 case 32: // vector quantization - 2 colors
171 9229 mask = AV_RB16(msk);
172 9229 msk += 2;
173
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174
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175 147664 tmp[x] = data[mask & 1];
176 147664 mask >>= 1;
177 }
178 36916 tmp += stride;
179 36916 tmp2 += stride;
180 }
181 9229 data += 2;
182 9229 break;
183 16 case 33: // vector quantization - 3 or 4 colors
184 case 34:
185 16 mask = AV_RB32(msk);
186 16 msk += 4;
187
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188
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 320 for(x = 0; x < 4; x++){
189 256 tmp[x] = data[mask & 3];
190 256 mask >>= 2;
191 }
192 64 tmp += stride;
193 64 tmp2 += stride;
194 }
195 16 data += type - 30;
196 16 break;
197 ✗ default:
198 ✗ av_log(avctx, AV_LOG_ERROR, "Unknown opcode %d\n", type);
199 ✗ return AVERROR_INVALIDDATA;
200 }
201 }
202 250 dst += stride * 4;
203 250 ref += stride * 4;
204 }
205 5 return 0;
206 }
207
208 39 static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
209 int *got_frame, AVPacket *avpkt)
210 {
211 39 DxaDecContext * const c = avctx->priv_data;
212 uint8_t *outptr, *srcptr, *tmpptr;
213 unsigned long dsize;
214 int i, j, compr, ret;
215 int stride;
216 39 int pc = 0;
217 GetByteContext gb;
218
219 39 bytestream2_init(&gb, avpkt->data, avpkt->size);
220
221 /* make the palette available on the way out */
222
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 39 if (bytestream2_peek_le32(&gb) == MKTAG('C','M','A','P')) {
223 2 bytestream2_skip(&gb, 4);
224
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 514 for(i = 0; i < 256; i++){
225 512 c->pal[i] = 0xFFU << 24 | bytestream2_get_be24(&gb);
226 }
227 2 pc = 1;
228 }
229
230
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 39 if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
231 ✗ return ret;
232 39 memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
233 #if FF_API_PALETTE_HAS_CHANGED
234 FF_DISABLE_DEPRECATION_WARNINGS
235 39 frame->palette_has_changed = pc;
236 FF_ENABLE_DEPRECATION_WARNINGS
237 #endif
238
239 39 outptr = frame->data[0];
240 39 srcptr = c->decomp_buf;
241 39 tmpptr = c->prev->data[0];
242 39 stride = frame->linesize[0];
243
244
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 39 if (bytestream2_get_le32(&gb) == MKTAG('N','U','L','L'))
245 19 compr = -1;
246 else
247 20 compr = bytestream2_get_byte(&gb);
248
249 39 dsize = c->dsize;
250
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 39 if (compr != 4 && compr != -1) {
251 20 bytestream2_skip(&gb, 4);
252
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 20 if (uncompress(c->decomp_buf, &dsize, avpkt->data + bytestream2_tell(&gb),
253 20 bytestream2_get_bytes_left(&gb)) != Z_OK) {
254 ✗ av_log(avctx, AV_LOG_ERROR, "Uncompress failed!\n");
255 ✗ return AVERROR_UNKNOWN;
256 }
257 20 memset(c->decomp_buf + dsize, 0, DECOMP_BUF_PADDING);
258 }
259
260
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 39 if (avctx->debug & FF_DEBUG_PICT_INFO)
261 ✗ av_log(avctx, AV_LOG_DEBUG, "compr:%2d, dsize:%d\n", compr, (int)dsize);
262
263
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 39 switch(compr){
264 19 case -1:
265 19 frame->flags &= ~AV_FRAME_FLAG_KEY;
266 19 frame->pict_type = AV_PICTURE_TYPE_P;
267
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 19 if (c->prev->data[0])
268 19 memcpy(frame->data[0], c->prev->data[0], frame->linesize[0] * avctx->height);
269 else{ // Should happen only when first frame is 'NULL'
270 ✗ memset(frame->data[0], 0, frame->linesize[0] * avctx->height);
271 ✗ frame->flags |= AV_FRAME_FLAG_KEY;
272 ✗ frame->pict_type = AV_PICTURE_TYPE_I;
273 }
274 19 break;
275 2 case 2:
276 case 4:
277 2 frame->flags |= AV_FRAME_FLAG_KEY;
278 2 frame->pict_type = AV_PICTURE_TYPE_I;
279
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 682 for (j = 0; j < avctx->height; j++) {
280 680 memcpy(outptr, srcptr, avctx->width);
281 680 outptr += stride;
282 680 srcptr += avctx->width;
283 }
284 2 break;
285 13 case 3:
286 case 5:
287
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 13 if (!tmpptr) {
288 ✗ av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
289 ✗ if (!(avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
290 ✗ return AVERROR_INVALIDDATA;
291 }
292 13 frame->flags &= ~AV_FRAME_FLAG_KEY;
293 13 frame->pict_type = AV_PICTURE_TYPE_P;
294
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295
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296
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 3999840 for(i = 0; i < avctx->width; i++)
297 3993600 outptr[i] = srcptr[i] ^ tmpptr[i];
298 6240 tmpptr += stride;
299 }else
300 ✗ memcpy(outptr, srcptr, avctx->width);
301 6240 outptr += stride;
302 6240 srcptr += avctx->width;
303 }
304 13 break;
305 5 case 12: // ScummVM coding
306 case 13:
307 5 frame->flags &= ~AV_FRAME_FLAG_KEY;
308 5 frame->pict_type = AV_PICTURE_TYPE_P;
309
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 5 if (!c->prev->data[0]) {
310 ✗ av_log(avctx, AV_LOG_ERROR, "Missing reference frame\n");
311 ✗ return AVERROR_INVALIDDATA;
312 }
313 5 decode_13(avctx, c, frame->data[0], frame->linesize[0], srcptr, dsize, c->prev->data[0]);
314 5 break;
315 ✗ default:
316 ✗ av_log(avctx, AV_LOG_ERROR, "Unknown/unsupported compression type %d\n", compr);
317 ✗ return AVERROR_INVALIDDATA;
318 }
319
320
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 39 if ((ret = av_frame_replace(c->prev, frame)) < 0)
321 ✗ return ret;
322
323 39 *got_frame = 1;
324
325 /* always report that the buffer was completely consumed */
326 39 return avpkt->size;
327 }
328
329 5 static av_cold int decode_init(AVCodecContext *avctx)
330 {
331 5 DxaDecContext * const c = avctx->priv_data;
332
333
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 5 if (avctx->width%4 || avctx->height%4) {
334 ✗ avpriv_request_sample(avctx, "dimensions are not a multiple of 4");
335 ✗ return AVERROR_INVALIDDATA;
336 }
337
338 5 c->prev = av_frame_alloc();
339
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 5 if (!c->prev)
340 ✗ return AVERROR(ENOMEM);
341
342 5 avctx->pix_fmt = AV_PIX_FMT_PAL8;
343
344 5 c->dsize = avctx->width * avctx->height * 2;
345 5 c->decomp_buf = av_malloc(c->dsize + DECOMP_BUF_PADDING);
346
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 5 if (!c->decomp_buf) {
347 ✗ av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
348 ✗ return AVERROR(ENOMEM);
349 }
350
351 5 return 0;
352 }
353
354 5 static av_cold int decode_end(AVCodecContext *avctx)
355 {
356 5 DxaDecContext * const c = avctx->priv_data;
357
358 5 av_freep(&c->decomp_buf);
359 5 av_frame_free(&c->prev);
360
361 5 return 0;
362 }
363
364 const FFCodec ff_dxa_decoder = {
365 .p.name = "dxa",
366 CODEC_LONG_NAME("Feeble Files/ScummVM DXA"),
367 .p.type = AVMEDIA_TYPE_VIDEO,
368 .p.id = AV_CODEC_ID_DXA,
369 .priv_data_size = sizeof(DxaDecContext),
370 .init = decode_init,
371 .close = decode_end,
372 FF_CODEC_DECODE_CB(decode_frame),
373 .p.capabilities = AV_CODEC_CAP_DR1,
374 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
375 };
376