blob: 560165adc7d4e7fabcd8b6b7d5ce9a1ed232fbbb
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 | if (!c->frame || !c->prev_frame) { |
255 | av_freep(&c->frame); |
256 | av_freep(&c->prev_frame); |
257 | return AVERROR(ENOMEM); |
258 | } |
259 | |
260 | return 0; |
261 | } |
262 | |
263 | static av_cold int decode_end(AVCodecContext *avctx) |
264 | { |
265 | VBDecContext *c = avctx->priv_data; |
266 | |
267 | av_freep(&c->frame); |
268 | av_freep(&c->prev_frame); |
269 | |
270 | return 0; |
271 | } |
272 | |
273 | AVCodec ff_vb_decoder = { |
274 | .name = "vb", |
275 | .long_name = NULL_IF_CONFIG_SMALL("Beam Software VB"), |
276 | .type = AVMEDIA_TYPE_VIDEO, |
277 | .id = AV_CODEC_ID_VB, |
278 | .priv_data_size = sizeof(VBDecContext), |
279 | .init = decode_init, |
280 | .close = decode_end, |
281 | .decode = decode_frame, |
282 | .capabilities = AV_CODEC_CAP_DR1, |
283 | }; |
284 |