FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/vb.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 124 144 86.1%
Branches: 62 84 73.8%

Line Branch Exec Source
1 /*
2 * Beam Software VB 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 * VB Video decoder
25 */
26
27 #include "avcodec.h"
28 #include "bytestream.h"
29 #include "codec_internal.h"
30 #include "decode.h"
31
32 enum VBFlags {
33 VB_HAS_GMC = 0x01,
34 VB_HAS_AUDIO = 0x04,
35 VB_HAS_VIDEO = 0x08,
36 VB_HAS_PALETTE = 0x10,
37 VB_HAS_LENGTH = 0x20
38 };
39
40 typedef struct VBDecContext {
41 AVCodecContext *avctx;
42
43 uint8_t *frame, *prev_frame;
44 uint32_t pal[AVPALETTE_COUNT];
45 GetByteContext stream;
46 } VBDecContext;
47
48 static const uint16_t vb_patterns[64] = {
49 0x0660, 0xFF00, 0xCCCC, 0xF000, 0x8888, 0x000F, 0x1111, 0xFEC8,
50 0x8CEF, 0x137F, 0xF731, 0xC800, 0x008C, 0x0013, 0x3100, 0xCC00,
51 0x00CC, 0x0033, 0x3300, 0x0FF0, 0x6666, 0x00F0, 0x0F00, 0x2222,
52 0x4444, 0xF600, 0x8CC8, 0x006F, 0x1331, 0x318C, 0xC813, 0x33CC,
53 0x6600, 0x0CC0, 0x0066, 0x0330, 0xF900, 0xC88C, 0x009F, 0x3113,
54 0x6000, 0x0880, 0x0006, 0x0110, 0xCC88, 0xFC00, 0x00CF, 0x88CC,
55 0x003F, 0x1133, 0x3311, 0xF300, 0x6FF6, 0x0603, 0x08C6, 0x8C63,
56 0xC631, 0x6310, 0xC060, 0x0136, 0x136C, 0x36C8, 0x6C80, 0x324C
57 };
58
59 1 static void vb_decode_palette(VBDecContext *c, int data_size)
60 {
61 int start, size, i;
62
63 1 start = bytestream2_get_byte(&c->stream);
64 1 size = (bytestream2_get_byte(&c->stream) - 1) & 0xFF;
65
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1 if (start + size > 255) {
66 av_log(c->avctx, AV_LOG_ERROR, "Palette change runs beyond entry 256\n");
67 return;
68 }
69
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1 if (size*3+2 > data_size) {
70 av_log(c->avctx, AV_LOG_ERROR, "Palette data runs beyond chunk size\n");
71 return;
72 }
73
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237 for (i = start; i <= start + size; i++)
74 236 c->pal[i] = 0xFFU << 24 | bytestream2_get_be24(&c->stream);
75 }
76
77 67819 static inline int check_pixel(uint8_t *buf, uint8_t *start, uint8_t *end)
78 {
79
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67819 return buf >= start && buf < end;
80 }
81
82 369468 static inline int check_line(uint8_t *buf, uint8_t *start, uint8_t *end)
83 {
84
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369468 return buf >= start && (buf + 4) <= end;
85 }
86
87 37 static int vb_decode_framedata(VBDecContext *c, int offset)
88 {
89 GetByteContext g;
90 uint8_t *prev, *cur;
91 int blk, blocks, t, blk2;
92 37 int blocktypes = 0;
93 int x, y, a, b;
94 int pattype, pattern;
95 37 const int width = c->avctx->width;
96 37 uint8_t *pstart = c->prev_frame;
97 37 uint8_t *pend = c->prev_frame + width*c->avctx->height;
98
99 37 g = c->stream;
100
101 37 prev = c->prev_frame + offset;
102 37 cur = c->frame;
103
104 37 blocks = (c->avctx->width >> 2) * (c->avctx->height >> 2);
105 37 blk2 = 0;
106
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177637 for (blk = 0; blk < blocks; blk++) {
107
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177600 if (!(blk & 3)) {
108
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44400 if (bytestream2_get_bytes_left(&g) < 1) {
109 av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n");
110 return AVERROR_INVALIDDATA;
111 }
112 44400 blocktypes = bytestream2_get_byte(&g);
113 }
114
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177600 switch (blocktypes & 0xC0) {
115 14413 case 0x00: //skip
116
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72065 for (y = 0; y < 4; y++)
117
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57652 if (check_line(prev + y*width, pstart, pend))
118 57652 memcpy(cur + y*width, prev + y*width, 4);
119 else
120 memset(cur + y*width, 0, 4);
121 14413 break;
122 93230 case 0x40:
123 93230 t = bytestream2_get_byte(&g);
124
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93230 if (!t) { //raw block
125
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15276 if (bytestream2_get_bytes_left(&g) < 16) {
126 av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n");
127 return AVERROR_INVALIDDATA;
128 }
129
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76380 for (y = 0; y < 4; y++)
130 61104 bytestream2_get_buffer(&g, cur + y * width, 4);
131 } else { // motion compensation
132 77954 x = ((t & 0xF)^8) - 8;
133 77954 y = ((t >> 4) ^8) - 8;
134 77954 t = x + y*width;
135
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389770 for (y = 0; y < 4; y++)
136
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311816 if (check_line(prev + t + y*width, pstart, pend))
137 311816 memcpy(cur + y*width, prev + t + y*width, 4);
138 else
139 memset(cur + y*width, 0, 4);
140 }
141 93230 break;
142 11328 case 0x80: // fill
143 11328 t = bytestream2_get_byte(&g);
144
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56640 for (y = 0; y < 4; y++)
145 45312 memset(cur + y*width, t, 4);
146 11328 break;
147 58629 case 0xC0: // pattern fill
148 58629 t = bytestream2_get_byte(&g);
149 58629 pattype = t >> 6;
150
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58629 pattern = vb_patterns[t & 0x3F];
151 switch (pattype) {
152 51372 case 0:
153 51372 a = bytestream2_get_byte(&g);
154 51372 b = bytestream2_get_byte(&g);
155
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256860 for (y = 0; y < 4; y++)
156
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1027440 for (x = 0; x < 4; x++, pattern >>= 1)
157
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821952 cur[x + y*width] = (pattern & 1) ? b : a;
158 51372 break;
159 4746 case 1:
160 4746 pattern = ~pattern;
161 7257 case 2:
162 7257 a = bytestream2_get_byte(&g);
163
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36285 for (y = 0; y < 4; y++)
164
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145140 for (x = 0; x < 4; x++, pattern >>= 1)
165
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116112 if (pattern & 1 && check_pixel(prev + x + y*width, pstart, pend))
166 67819 cur[x + y*width] = prev[x + y*width];
167 else
168 48293 cur[x + y*width] = a;
169 7257 break;
170 case 3:
171 av_log(c->avctx, AV_LOG_ERROR, "Invalid opcode seen @%d\n", blk);
172 return AVERROR_INVALIDDATA;
173 }
174 58629 break;
175 }
176 177600 blocktypes <<= 2;
177 177600 cur += 4;
178 177600 prev += 4;
179 177600 blk2++;
180
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177600 if (blk2 == (width >> 2)) {
181 2220 blk2 = 0;
182 2220 cur += width * 3;
183 2220 prev += width * 3;
184 }
185 }
186 37 return 0;
187 }
188
189 37 static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
190 int *got_frame, AVPacket *avpkt)
191 {
192 37 VBDecContext * const c = avctx->priv_data;
193 uint8_t *outptr, *srcptr;
194 int i, j, ret;
195 int flags;
196 uint32_t size;
197 37 int offset = 0;
198
199
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37 if (avpkt->size < 2)
200 return AVERROR_INVALIDDATA;
201
202 37 bytestream2_init(&c->stream, avpkt->data, avpkt->size);
203
204
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37 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
205 return ret;
206
207 37 flags = bytestream2_get_le16(&c->stream);
208
209
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37 if (flags & VB_HAS_GMC) {
210 8 i = (int16_t)bytestream2_get_le16(&c->stream);
211 8 j = (int16_t)bytestream2_get_le16(&c->stream);
212
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8 if (FFABS(j) > avctx->height) {
213 av_log(avctx, AV_LOG_ERROR, "GMV out of range\n");
214 return AVERROR_INVALIDDATA;
215 }
216 8 offset = i + j * avctx->width;
217 }
218
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37 if (flags & VB_HAS_VIDEO) {
219 37 size = bytestream2_get_le32(&c->stream);
220
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37 if(size > bytestream2_get_bytes_left(&c->stream)+4 || size<4){
221 av_log(avctx, AV_LOG_ERROR, "Frame size invalid\n");
222 return -1;
223 }
224 37 vb_decode_framedata(c, offset);
225 37 bytestream2_skip(&c->stream, size - 4);
226 }
227
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37 if (flags & VB_HAS_PALETTE) {
228 1 size = bytestream2_get_le32(&c->stream);
229 1 vb_decode_palette(c, size);
230 }
231
232 37 memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
233 37 frame->palette_has_changed = flags & VB_HAS_PALETTE;
234
235 37 outptr = frame->data[0];
236 37 srcptr = c->frame;
237
238
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8917 for (i = 0; i < avctx->height; i++) {
239 8880 memcpy(outptr, srcptr, avctx->width);
240 8880 srcptr += avctx->width;
241 8880 outptr += frame->linesize[0];
242 }
243
244 37 FFSWAP(uint8_t*, c->frame, c->prev_frame);
245
246 37 *got_frame = 1;
247
248 /* always report that the buffer was completely consumed */
249 37 return avpkt->size;
250 }
251
252 3 static av_cold int decode_init(AVCodecContext *avctx)
253 {
254 3 VBDecContext * const c = avctx->priv_data;
255
256 3 c->avctx = avctx;
257 3 avctx->pix_fmt = AV_PIX_FMT_PAL8;
258
259 3 c->frame = av_mallocz(avctx->width * avctx->height);
260 3 c->prev_frame = av_mallocz(avctx->width * avctx->height);
261
262
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3 if (!c->frame || !c->prev_frame)
263 return AVERROR(ENOMEM);
264
265 3 return 0;
266 }
267
268 3 static av_cold int decode_end(AVCodecContext *avctx)
269 {
270 3 VBDecContext *c = avctx->priv_data;
271
272 3 av_freep(&c->frame);
273 3 av_freep(&c->prev_frame);
274
275 3 return 0;
276 }
277
278 const FFCodec ff_vb_decoder = {
279 .p.name = "vb",
280 CODEC_LONG_NAME("Beam Software VB"),
281 .p.type = AVMEDIA_TYPE_VIDEO,
282 .p.id = AV_CODEC_ID_VB,
283 .priv_data_size = sizeof(VBDecContext),
284 .init = decode_init,
285 .close = decode_end,
286 FF_CODEC_DECODE_CB(decode_frame),
287 .p.capabilities = AV_CODEC_CAP_DR1,
288 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
289 };
290