Directory: | ../../../ffmpeg/ |
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File: | src/libavcodec/dxa.c |
Date: | 2022-07-04 00:18:54 |
Exec | Total | Coverage | |
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Lines: | 186 | 220 | 84.5% |
Branches: | 90 | 121 | 74.4% |
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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 <stdio.h> | ||
28 | #include <stdlib.h> | ||
29 | |||
30 | #include "libavutil/common.h" | ||
31 | #include "libavutil/intreadwrite.h" | ||
32 | #include "bytestream.h" | ||
33 | #include "avcodec.h" | ||
34 | #include "codec_internal.h" | ||
35 | #include "internal.h" | ||
36 | |||
37 | #include <zlib.h> | ||
38 | |||
39 | /* | ||
40 | * Decoder context | ||
41 | */ | ||
42 | typedef struct DxaDecContext { | ||
43 | AVFrame *prev; | ||
44 | |||
45 | int dsize; | ||
46 | #define DECOMP_BUF_PADDING 16 | ||
47 | uint8_t *decomp_buf; | ||
48 | uint32_t pal[256]; | ||
49 | } DxaDecContext; | ||
50 | |||
51 | static const int shift1[6] = { 0, 8, 8, 8, 4, 4 }; | ||
52 | static const int shift2[6] = { 0, 0, 8, 4, 0, 4 }; | ||
53 | |||
54 | 5 | static int decode_13(AVCodecContext *avctx, DxaDecContext *c, uint8_t* dst, | |
55 | int stride, uint8_t *src, int srcsize, uint8_t *ref) | ||
56 | { | ||
57 | uint8_t *code, *data, *mv, *msk, *tmp, *tmp2; | ||
58 | 5 | uint8_t *src_end = src + srcsize; | |
59 | int i, j, k; | ||
60 | int type, x, y, d, d2; | ||
61 | uint32_t mask; | ||
62 | |||
63 |
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5 | if (12ULL + ((avctx->width * avctx->height) >> 4) + AV_RB32(src + 0) + AV_RB32(src + 4) > srcsize) |
64 | ✗ | return AVERROR_INVALIDDATA; | |
65 | |||
66 | 5 | code = src + 12; | |
67 | 5 | data = code + ((avctx->width * avctx->height) >> 4); | |
68 | 5 | mv = data + AV_RB32(src + 0); | |
69 | 5 | msk = mv + AV_RB32(src + 4); | |
70 | |||
71 |
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255 | for(j = 0; j < avctx->height; j += 4){ |
72 |
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40250 | for(i = 0; i < avctx->width; i += 4){ |
73 |
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40000 | if (data > src_end || mv > src_end || msk > src_end) |
74 | ✗ | return AVERROR_INVALIDDATA; | |
75 | 40000 | tmp = dst + i; | |
76 | 40000 | tmp2 = ref + i; | |
77 | 40000 | type = *code++; | |
78 |
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40000 | switch(type){ |
79 | 227 | case 4: // motion compensation | |
80 |
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227 | x = (*mv) >> 4; if(x & 8) x = 8 - x; |
81 |
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227 | y = (*mv++) & 0xF; if(y & 8) y = 8 - y; |
82 |
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227 | if (i < -x || avctx->width - i - 4 < x || |
83 |
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227 | j < -y || avctx->height - j - 4 < y) { |
84 | ✗ | av_log(avctx, AV_LOG_ERROR, "MV %d %d out of bounds\n", x,y); | |
85 | ✗ | return AVERROR_INVALIDDATA; | |
86 | } | ||
87 | 227 | tmp2 += x + y*stride; | |
88 | 26615 | case 0: // skip | |
89 | case 5: // skip in method 12 | ||
90 |
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133075 | for(y = 0; y < 4; y++){ |
91 | 106460 | memcpy(tmp, tmp2, 4); | |
92 | 106460 | tmp += stride; | |
93 | 106460 | tmp2 += stride; | |
94 | } | ||
95 | 26615 | break; | |
96 | 326 | case 1: // masked change | |
97 | case 10: // masked change with only half of pixels changed | ||
98 | case 11: // cases 10-15 are for method 12 only | ||
99 | case 12: | ||
100 | case 13: | ||
101 | case 14: | ||
102 | case 15: | ||
103 |
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326 | if(type == 1){ |
104 | 326 | mask = AV_RB16(msk); | |
105 | 326 | msk += 2; | |
106 | }else{ | ||
107 | ✗ | type -= 10; | |
108 | ✗ | mask = ((msk[0] & 0xF0) << shift1[type]) | ((msk[0] & 0xF) << shift2[type]); | |
109 | ✗ | msk++; | |
110 | } | ||
111 |
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1630 | for(y = 0; y < 4; y++){ |
112 |
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113 |
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5216 | tmp[x] = (mask & 0x8000) ? *data++ : tmp2[x]; |
114 | 5216 | mask <<= 1; | |
115 | } | ||
116 | 1304 | tmp += stride; | |
117 | 1304 | tmp2 += stride; | |
118 | } | ||
119 | 326 | break; | |
120 | 2428 | case 2: // fill block | |
121 |
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12140 | for(y = 0; y < 4; y++){ |
122 | 9712 | memset(tmp, data[0], 4); | |
123 | 9712 | tmp += stride; | |
124 | } | ||
125 | 2428 | data++; | |
126 | 2428 | break; | |
127 | 705 | case 3: // raw block | |
128 |
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3525 | for(y = 0; y < 4; y++){ |
129 | 2820 | memcpy(tmp, data, 4); | |
130 | 2820 | data += 4; | |
131 | 2820 | tmp += stride; | |
132 | } | ||
133 | 705 | break; | |
134 | 681 | case 8: // subblocks - method 13 only | |
135 | 681 | mask = *msk++; | |
136 |
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3405 | for(k = 0; k < 4; k++){ |
137 | 2724 | d = ((k & 1) << 1) + ((k & 2) * stride); | |
138 | 2724 | d2 = ((k & 1) << 1) + ((k & 2) * stride); | |
139 | 2724 | tmp2 = ref + i + d2; | |
140 |
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2724 | switch(mask & 0xC0){ |
141 | 361 | case 0x80: // motion compensation | |
142 |
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361 | x = (*mv) >> 4; if(x & 8) x = 8 - x; |
143 |
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361 | y = (*mv++) & 0xF; if(y & 8) y = 8 - y; |
144 |
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361 | if (i + 2*(k & 1) < -x || avctx->width - i - 2*(k & 1) - 2 < x || |
145 |
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361 | j + (k & 2) < -y || avctx->height - j - (k & 2) - 2 < y) { |
146 | ✗ | av_log(avctx, AV_LOG_ERROR, "MV %d %d out of bounds\n", x,y); | |
147 | ✗ | return AVERROR_INVALIDDATA; | |
148 | } | ||
149 | 361 | tmp2 += x + y*stride; | |
150 | 1446 | case 0x00: // skip | |
151 | 1446 | tmp[d + 0 ] = tmp2[0]; | |
152 | 1446 | tmp[d + 1 ] = tmp2[1]; | |
153 | 1446 | tmp[d + 0 + stride] = tmp2[0 + stride]; | |
154 | 1446 | tmp[d + 1 + stride] = tmp2[1 + stride]; | |
155 | 1446 | break; | |
156 | 696 | case 0x40: // fill | |
157 | 696 | tmp[d + 0 ] = data[0]; | |
158 | 696 | tmp[d + 1 ] = data[0]; | |
159 | 696 | tmp[d + 0 + stride] = data[0]; | |
160 | 696 | tmp[d + 1 + stride] = data[0]; | |
161 | 696 | data++; | |
162 | 696 | break; | |
163 | 582 | case 0xC0: // raw | |
164 | 582 | tmp[d + 0 ] = *data++; | |
165 | 582 | tmp[d + 1 ] = *data++; | |
166 | 582 | tmp[d + 0 + stride] = *data++; | |
167 | 582 | tmp[d + 1 + stride] = *data++; | |
168 | 582 | break; | |
169 | } | ||
170 | 2724 | mask <<= 2; | |
171 | } | ||
172 | 681 | break; | |
173 | 9229 | case 32: // vector quantization - 2 colors | |
174 | 9229 | mask = AV_RB16(msk); | |
175 | 9229 | msk += 2; | |
176 |
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46145 | for(y = 0; y < 4; y++){ |
177 |
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184580 | for(x = 0; x < 4; x++){ |
178 | 147664 | tmp[x] = data[mask & 1]; | |
179 | 147664 | mask >>= 1; | |
180 | } | ||
181 | 36916 | tmp += stride; | |
182 | 36916 | tmp2 += stride; | |
183 | } | ||
184 | 9229 | data += 2; | |
185 | 9229 | break; | |
186 | 16 | case 33: // vector quantization - 3 or 4 colors | |
187 | case 34: | ||
188 | 16 | mask = AV_RB32(msk); | |
189 | 16 | msk += 4; | |
190 |
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80 | for(y = 0; y < 4; y++){ |
191 |
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320 | for(x = 0; x < 4; x++){ |
192 | 256 | tmp[x] = data[mask & 3]; | |
193 | 256 | mask >>= 2; | |
194 | } | ||
195 | 64 | tmp += stride; | |
196 | 64 | tmp2 += stride; | |
197 | } | ||
198 | 16 | data += type - 30; | |
199 | 16 | break; | |
200 | ✗ | default: | |
201 | ✗ | av_log(avctx, AV_LOG_ERROR, "Unknown opcode %d\n", type); | |
202 | ✗ | return AVERROR_INVALIDDATA; | |
203 | } | ||
204 | } | ||
205 | 250 | dst += stride * 4; | |
206 | 250 | ref += stride * 4; | |
207 | } | ||
208 | 5 | return 0; | |
209 | } | ||
210 | |||
211 | 33 | static int decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
212 | int *got_frame, AVPacket *avpkt) | ||
213 | { | ||
214 | 33 | DxaDecContext * const c = avctx->priv_data; | |
215 | uint8_t *outptr, *srcptr, *tmpptr; | ||
216 | unsigned long dsize; | ||
217 | int i, j, compr, ret; | ||
218 | int stride; | ||
219 | 33 | int pc = 0; | |
220 | GetByteContext gb; | ||
221 | |||
222 | 33 | bytestream2_init(&gb, avpkt->data, avpkt->size); | |
223 | |||
224 | /* make the palette available on the way out */ | ||
225 |
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33 | if (bytestream2_peek_le32(&gb) == MKTAG('C','M','A','P')) { |
226 | 2 | bytestream2_skip(&gb, 4); | |
227 |
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514 | for(i = 0; i < 256; i++){ |
228 | 512 | c->pal[i] = 0xFFU << 24 | bytestream2_get_be24(&gb); | |
229 | } | ||
230 | 2 | pc = 1; | |
231 | } | ||
232 | |||
233 |
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33 | if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) |
234 | ✗ | return ret; | |
235 | 33 | memcpy(frame->data[1], c->pal, AVPALETTE_SIZE); | |
236 | 33 | frame->palette_has_changed = pc; | |
237 | |||
238 | 33 | outptr = frame->data[0]; | |
239 | 33 | srcptr = c->decomp_buf; | |
240 | 33 | tmpptr = c->prev->data[0]; | |
241 | 33 | stride = frame->linesize[0]; | |
242 | |||
243 |
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33 | if (bytestream2_get_le32(&gb) == MKTAG('N','U','L','L')) |
244 | 16 | compr = -1; | |
245 | else | ||
246 | 17 | compr = bytestream2_get_byte(&gb); | |
247 | |||
248 | 33 | dsize = c->dsize; | |
249 |
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33 | if (compr != 4 && compr != -1) { |
250 | 17 | bytestream2_skip(&gb, 4); | |
251 |
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17 | if (uncompress(c->decomp_buf, &dsize, avpkt->data + bytestream2_tell(&gb), |
252 | 17 | bytestream2_get_bytes_left(&gb)) != Z_OK) { | |
253 | ✗ | av_log(avctx, AV_LOG_ERROR, "Uncompress failed!\n"); | |
254 | ✗ | return AVERROR_UNKNOWN; | |
255 | } | ||
256 | 17 | memset(c->decomp_buf + dsize, 0, DECOMP_BUF_PADDING); | |
257 | } | ||
258 | |||
259 |
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33 | if (avctx->debug & FF_DEBUG_PICT_INFO) |
260 | ✗ | av_log(avctx, AV_LOG_DEBUG, "compr:%2d, dsize:%d\n", compr, (int)dsize); | |
261 | |||
262 |
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33 | switch(compr){ |
263 | 16 | case -1: | |
264 | 16 | frame->key_frame = 0; | |
265 | 16 | frame->pict_type = AV_PICTURE_TYPE_P; | |
266 |
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16 | if (c->prev->data[0]) |
267 | 16 | memcpy(frame->data[0], c->prev->data[0], frame->linesize[0] * avctx->height); | |
268 | else{ // Should happen only when first frame is 'NULL' | ||
269 | ✗ | memset(frame->data[0], 0, frame->linesize[0] * avctx->height); | |
270 | ✗ | frame->key_frame = 1; | |
271 | ✗ | frame->pict_type = AV_PICTURE_TYPE_I; | |
272 | } | ||
273 | 16 | break; | |
274 | 2 | case 2: | |
275 | case 4: | ||
276 | 2 | frame->key_frame = 1; | |
277 | 2 | frame->pict_type = AV_PICTURE_TYPE_I; | |
278 |
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682 | for (j = 0; j < avctx->height; j++) { |
279 | 680 | memcpy(outptr, srcptr, avctx->width); | |
280 | 680 | outptr += stride; | |
281 | 680 | srcptr += avctx->width; | |
282 | } | ||
283 | 2 | break; | |
284 | 10 | case 3: | |
285 | case 5: | ||
286 |
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10 | if (!tmpptr) { |
287 | ✗ | av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n"); | |
288 | ✗ | if (!(avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL)) | |
289 | ✗ | return AVERROR_INVALIDDATA; | |
290 | } | ||
291 | 10 | frame->key_frame = 0; | |
292 | 10 | frame->pict_type = AV_PICTURE_TYPE_P; | |
293 |
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4810 | for (j = 0; j < avctx->height; j++) { |
294 |
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4800 | if(tmpptr){ |
295 |
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3076800 | for(i = 0; i < avctx->width; i++) |
296 | 3072000 | outptr[i] = srcptr[i] ^ tmpptr[i]; | |
297 | 4800 | tmpptr += stride; | |
298 | }else | ||
299 | ✗ | memcpy(outptr, srcptr, avctx->width); | |
300 | 4800 | outptr += stride; | |
301 | 4800 | srcptr += avctx->width; | |
302 | } | ||
303 | 10 | break; | |
304 | 5 | case 12: // ScummVM coding | |
305 | case 13: | ||
306 | 5 | frame->key_frame = 0; | |
307 | 5 | frame->pict_type = AV_PICTURE_TYPE_P; | |
308 |
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5 | if (!c->prev->data[0]) { |
309 | ✗ | av_log(avctx, AV_LOG_ERROR, "Missing reference frame\n"); | |
310 | ✗ | return AVERROR_INVALIDDATA; | |
311 | } | ||
312 | 5 | decode_13(avctx, c, frame->data[0], frame->linesize[0], srcptr, dsize, c->prev->data[0]); | |
313 | 5 | break; | |
314 | ✗ | default: | |
315 | ✗ | av_log(avctx, AV_LOG_ERROR, "Unknown/unsupported compression type %d\n", compr); | |
316 | ✗ | return AVERROR_INVALIDDATA; | |
317 | } | ||
318 | |||
319 | 33 | av_frame_unref(c->prev); | |
320 |
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33 | if ((ret = av_frame_ref(c->prev, frame)) < 0) |
321 | ✗ | return ret; | |
322 | |||
323 | 33 | *got_frame = 1; | |
324 | |||
325 | /* always report that the buffer was completely consumed */ | ||
326 | 33 | 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 | .p.long_name = NULL_IF_CONFIG_SMALL("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_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, | ||
375 | }; | ||
376 |