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
33
40 };
41
44
49
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
62 {
64
65 start = bytestream2_get_byte(&c->
stream);
66 size = (bytestream2_get_byte(&c->
stream) - 1) & 0xFF;
67 if (start + size > 255) {
69 return;
70 }
71 if (size*3+2 > data_size) {
73 return;
74 }
75 for (i = start; i <= start +
size; i++)
76 c->
pal[i] = 0xFFU << 24 | bytestream2_get_be24(&c->
stream);
77 }
78
80 {
81 return buf >= start && buf <
end;
82 }
83
85 {
86 return buf >= start && (buf + 4) <= end;
87 }
88
90 {
93 int blk, blocks, t, blk2;
94 int blocktypes = 0;
96 int pattype, pattern;
100
102
105
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++)
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
126 }
127 for (y = 0; y < 4; y++)
129 } else { // motion compensation
130 x = ((t & 0xF)^8) - 8;
131 y = ((t >> 4) ^8) - 8;
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;
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))
165 else
167 break;
168 case 3:
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
189 {
193 int i, j, ret;
197
199
201 return ret;
202
203 flags = bytestream2_get_le16(&c->
stream);
204
206 i = (int16_t)bytestream2_get_le16(&c->
stream);
207 j = (int16_t)bytestream2_get_le16(&c->
stream);
211 }
212 offset = i + j * avctx->
width;
213 }
215 size = bytestream2_get_le32(&c->
stream);
218 return -1;
219 }
222 }
224 size = bytestream2_get_le32(&c->
stream);
226 }
227
230
231 outptr = frame->
data[0];
233
234 for (i = 0; i < avctx->
height; i++) {
235 memcpy(outptr, srcptr, avctx->
width);
236 srcptr += avctx->
width;
238 }
239
241
242 *got_frame = 1;
243
244 /* always report that the buffer was completely consumed */
246 }
247
249 {
251
254
257
262 }
263
264 return 0;
265 }
266
268 {
270
273
274 return 0;
275 }
276
287 };
static int check_line(uint8_t *buf, uint8_t *start, uint8_t *end)
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
This structure describes decoded (raw) audio or video data.
ptrdiff_t const GLvoid * data
static av_cold int init(AVCodecContext *avctx)
static av_cold int decode_end(AVCodecContext *avctx)
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
uint32_t pal[AVPALETTE_COUNT]
8 bits with AV_PIX_FMT_RGB32 palette
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
static av_cold int end(AVCodecContext *avctx)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
const char * name
Name of the codec implementation.
static const uint8_t offset[127][2]
static const uint16_t vb_patterns[64]
int width
picture width / height.
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Libavcodec external API header.
static int check_pixel(uint8_t *buf, uint8_t *start, uint8_t *end)
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
main external API structure.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
int palette_has_changed
Tell user application that palette has changed from previous frame.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
common internal api header.
static void vb_decode_palette(VBDecContext *c, int data_size)
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
#define FFSWAP(type, a, b)
This structure stores compressed data.
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
static int vb_decode_framedata(VBDecContext *c, int offset)
static av_cold int decode_init(AVCodecContext *avctx)