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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 <stdio.h> | |
28 | #include <stdlib.h> | |
29 | ||
30 | #include "avcodec.h" | |
31 | #include "bytestream.h" | |
32 | #include "internal.h" | |
33 | ||
34 | enum VBFlags { | |
35 | VB_HAS_GMC = 0x01, | |
36 | VB_HAS_AUDIO = 0x04, | |
37 | VB_HAS_VIDEO = 0x08, | |
38 | VB_HAS_PALETTE = 0x10, | |
39 | VB_HAS_LENGTH = 0x20 | |
40 | }; | |
41 | ||
42 | typedef struct VBDecContext { | |
43 | AVCodecContext *avctx; | |
44 | ||
45 | uint8_t *frame, *prev_frame; | |
46 | uint32_t pal[AVPALETTE_COUNT]; | |
47 | GetByteContext stream; | |
48 | } VBDecContext; | |
49 | ||
50 | static const uint16_t vb_patterns[64] = { | |
51 | 0x0660, 0xFF00, 0xCCCC, 0xF000, 0x8888, 0x000F, 0x1111, 0xFEC8, | |
52 | 0x8CEF, 0x137F, 0xF731, 0xC800, 0x008C, 0x0013, 0x3100, 0xCC00, | |
53 | 0x00CC, 0x0033, 0x3300, 0x0FF0, 0x6666, 0x00F0, 0x0F00, 0x2222, | |
54 | 0x4444, 0xF600, 0x8CC8, 0x006F, 0x1331, 0x318C, 0xC813, 0x33CC, | |
55 | 0x6600, 0x0CC0, 0x0066, 0x0330, 0xF900, 0xC88C, 0x009F, 0x3113, | |
56 | 0x6000, 0x0880, 0x0006, 0x0110, 0xCC88, 0xFC00, 0x00CF, 0x88CC, | |
57 | 0x003F, 0x1133, 0x3311, 0xF300, 0x6FF6, 0x0603, 0x08C6, 0x8C63, | |
58 | 0xC631, 0x6310, 0xC060, 0x0136, 0x136C, 0x36C8, 0x6C80, 0x324C | |
59 | }; | |
60 | ||
61 | static void vb_decode_palette(VBDecContext *c, int data_size) | |
62 | { | |
63 | int start, size, i; | |
64 | ||
65 | start = bytestream2_get_byte(&c->stream); | |
66 | size = (bytestream2_get_byte(&c->stream) - 1) & 0xFF; | |
67 | if (start + size > 255) { | |
68 | av_log(c->avctx, AV_LOG_ERROR, "Palette change runs beyond entry 256\n"); | |
69 | return; | |
70 | } | |
71 | if (size*3+2 > data_size) { | |
72 | av_log(c->avctx, AV_LOG_ERROR, "Palette data runs beyond chunk size\n"); | |
73 | return; | |
74 | } | |
75 | for (i = start; i <= start + size; i++) | |
76 | c->pal[i] = 0xFFU << 24 | bytestream2_get_be24(&c->stream); | |
77 | } | |
78 | ||
79 | static inline int check_pixel(uint8_t *buf, uint8_t *start, uint8_t *end) | |
80 | { | |
81 | return buf >= start && buf < end; | |
82 | } | |
83 | ||
84 | static inline int check_line(uint8_t *buf, uint8_t *start, uint8_t *end) | |
85 | { | |
86 | return buf >= start && (buf + 4) <= end; | |
87 | } | |
88 | ||
89 | static int vb_decode_framedata(VBDecContext *c, int offset) | |
90 | { | |
91 | GetByteContext g; | |
92 | uint8_t *prev, *cur; | |
93 | int blk, blocks, t, blk2; | |
94 | int blocktypes = 0; | |
95 | int x, y, a, b; | |
96 | int pattype, pattern; | |
97 | const int width = c->avctx->width; | |
98 | uint8_t *pstart = c->prev_frame; | |
99 | uint8_t *pend = c->prev_frame + width*c->avctx->height; | |
100 | ||
101 | g = c->stream; | |
102 | ||
103 | prev = c->prev_frame + offset; | |
104 | cur = c->frame; | |
105 | ||
106 | blocks = (c->avctx->width >> 2) * (c->avctx->height >> 2); | |
107 | blk2 = 0; | |
108 | for (blk = 0; blk < blocks; blk++) { | |
109 | if (!(blk & 3)) { | |
110 | blocktypes = bytestream2_get_byte(&g); | |
111 | } | |
112 | switch (blocktypes & 0xC0) { | |
113 | case 0x00: //skip | |
114 | for (y = 0; y < 4; y++) | |
115 | if (check_line(prev + y*width, pstart, pend)) | |
116 | memcpy(cur + y*width, prev + y*width, 4); | |
117 | else | |
118 | memset(cur + y*width, 0, 4); | |
119 | break; | |
120 | case 0x40: | |
121 | t = bytestream2_get_byte(&g); | |
122 | if (!t) { //raw block | |
123 | if (bytestream2_get_bytes_left(&g) < 16) { | |
124 | av_log(c->avctx, AV_LOG_ERROR, "Insufficient data\n"); | |
125 | return AVERROR_INVALIDDATA; | |
126 | } | |
127 | for (y = 0; y < 4; y++) | |
128 | bytestream2_get_buffer(&g, cur + y * width, 4); | |
129 | } else { // motion compensation | |
130 | x = ((t & 0xF)^8) - 8; | |
131 | y = ((t >> 4) ^8) - 8; | |
132 | t = x + y*width; | |
133 | for (y = 0; y < 4; y++) | |
134 | if (check_line(prev + t + y*width, pstart, pend)) | |
135 | memcpy(cur + y*width, prev + t + y*width, 4); | |
136 | else | |
137 | memset(cur + y*width, 0, 4); | |
138 | } | |
139 | break; | |
140 | case 0x80: // fill | |
141 | t = bytestream2_get_byte(&g); | |
142 | for (y = 0; y < 4; y++) | |
143 | memset(cur + y*width, t, 4); | |
144 | break; | |
145 | case 0xC0: // pattern fill | |
146 | t = bytestream2_get_byte(&g); | |
147 | pattype = t >> 6; | |
148 | pattern = vb_patterns[t & 0x3F]; | |
149 | switch (pattype) { | |
150 | case 0: | |
151 | a = bytestream2_get_byte(&g); | |
152 | b = bytestream2_get_byte(&g); | |
153 | for (y = 0; y < 4; y++) | |
154 | for (x = 0; x < 4; x++, pattern >>= 1) | |
155 | cur[x + y*width] = (pattern & 1) ? b : a; | |
156 | break; | |
157 | case 1: | |
158 | pattern = ~pattern; | |
159 | case 2: | |
160 | a = bytestream2_get_byte(&g); | |
161 | for (y = 0; y < 4; y++) | |
162 | for (x = 0; x < 4; x++, pattern >>= 1) | |
163 | if (pattern & 1 && check_pixel(prev + x + y*width, pstart, pend)) | |
164 | cur[x + y*width] = prev[x + y*width]; | |
165 | else | |
166 | cur[x + y*width] = a; | |
167 | break; | |
168 | case 3: | |
169 | av_log(c->avctx, AV_LOG_ERROR, "Invalid opcode seen @%d\n", blk); | |
170 | return AVERROR_INVALIDDATA; | |
171 | } | |
172 | break; | |
173 | } | |
174 | blocktypes <<= 2; | |
175 | cur += 4; | |
176 | prev += 4; | |
177 | blk2++; | |
178 | if (blk2 == (width >> 2)) { | |
179 | blk2 = 0; | |
180 | cur += width * 3; | |
181 | prev += width * 3; | |
182 | } | |
183 | } | |
184 | return 0; | |
185 | } | |
186 | ||
187 | static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, | |
188 | AVPacket *avpkt) | |
189 | { | |
190 | VBDecContext * const c = avctx->priv_data; | |
191 | AVFrame *frame = data; | |
192 | uint8_t *outptr, *srcptr; | |
193 | int i, j, ret; | |
194 | int flags; | |
195 | uint32_t size; | |
196 | int offset = 0; | |
197 | ||
198 | bytestream2_init(&c->stream, avpkt->data, avpkt->size); | |
199 | ||
200 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
201 | return ret; | |
202 | ||
203 | flags = bytestream2_get_le16(&c->stream); | |
204 | ||
205 | if (flags & VB_HAS_GMC) { | |
206 | i = (int16_t)bytestream2_get_le16(&c->stream); | |
207 | j = (int16_t)bytestream2_get_le16(&c->stream); | |
208 | offset = i + j * avctx->width; | |
209 | } | |
210 | if (flags & VB_HAS_VIDEO) { | |
211 | size = bytestream2_get_le32(&c->stream); | |
212 | if(size > bytestream2_get_bytes_left(&c->stream)+4 || size<4){ | |
213 | av_log(avctx, AV_LOG_ERROR, "Frame size invalid\n"); | |
214 | return -1; | |
215 | } | |
216 | vb_decode_framedata(c, offset); | |
217 | bytestream2_skip(&c->stream, size - 4); | |
218 | } | |
219 | if (flags & VB_HAS_PALETTE) { | |
220 | size = bytestream2_get_le32(&c->stream); | |
221 | vb_decode_palette(c, size); | |
222 | } | |
223 | ||
224 | memcpy(frame->data[1], c->pal, AVPALETTE_SIZE); | |
225 | frame->palette_has_changed = flags & VB_HAS_PALETTE; | |
226 | ||
227 | outptr = frame->data[0]; | |
228 | srcptr = c->frame; | |
229 | ||
230 | for (i = 0; i < avctx->height; i++) { | |
231 | memcpy(outptr, srcptr, avctx->width); | |
232 | srcptr += avctx->width; | |
233 | outptr += frame->linesize[0]; | |
234 | } | |
235 | ||
236 | FFSWAP(uint8_t*, c->frame, c->prev_frame); | |
237 | ||
238 | *got_frame = 1; | |
239 | ||
240 | /* always report that the buffer was completely consumed */ | |
241 | return avpkt->size; | |
242 | } | |
243 | ||
244 | static av_cold int decode_init(AVCodecContext *avctx) | |
245 | { | |
246 | VBDecContext * const c = avctx->priv_data; | |
247 | ||
248 | c->avctx = avctx; | |
249 | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
250 | ||
251 | c->frame = av_mallocz(avctx->width * avctx->height); | |
252 | c->prev_frame = av_mallocz(avctx->width * avctx->height); | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
257 | static av_cold int decode_end(AVCodecContext *avctx) | |
258 | { | |
259 | VBDecContext *c = avctx->priv_data; | |
260 | ||
261 | av_freep(&c->frame); | |
262 | av_freep(&c->prev_frame); | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | AVCodec ff_vb_decoder = { | |
268 | .name = "vb", | |
269 | .long_name = NULL_IF_CONFIG_SMALL("Beam Software VB"), | |
270 | .type = AVMEDIA_TYPE_VIDEO, | |
271 | .id = AV_CODEC_ID_VB, | |
272 | .priv_data_size = sizeof(VBDecContext), | |
273 | .init = decode_init, | |
274 | .close = decode_end, | |
275 | .decode = decode_frame, | |
276 | .capabilities = CODEC_CAP_DR1, | |
277 | }; |