1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
|
#include <stdio.h>
#include <stdlib.h>
#include "config.h"
#include "mp_msg.h"
#include "vd_internal.h"
static vd_info_t info = {
"Microsoft RLE decoder",
"msrle",
VFM_MSRLE,
"A'rpi",
"Mike Melanson",
"native codec"
};
LIBVD_EXTERN(msrle)
// to set/get/query special features/parameters
static int control(sh_video_t *sh,int cmd,void* arg,...){
return CONTROL_UNKNOWN;
}
// init driver
static int init(sh_video_t *sh){
unsigned char *palette = (unsigned char *)sh->bih+40;
int i;
unsigned short color;
// if BGR15 & BGR16, modify palette in place
for (i = 0; i < sh->bih->biClrUsed; i++)
{
}
return mpcodecs_config_vo(sh,sh->disp_w,sh->disp_h,IMGFMT_BGR24);
}
// uninit driver
static void uninit(sh_video_t *sh){
}
//mp_image_t* mpcodecs_get_image(sh_video_t *sh, int mp_imgtype, int mp_imgflag, int w, int h);
#define FETCH_NEXT_STREAM_BYTE() \
if (stream_ptr >= encoded_size) \
{ \
mp_msg(MSGT_DECVIDEO, MSGL_WARN, \
"MS RLE: stream ptr just went out of bounds (1)\n"); \
return; \
} \
stream_byte = encoded[stream_ptr++];
void decode_msrle4(
unsigned char *encoded,
int encoded_size,
unsigned char *decoded,
int width,
int height,
unsigned char *palette_map,
int bits_per_pixel)
{
int bytes_per_pixel = (bits_per_pixel + 1) / 8;
unsigned char r1, g1, b1;
unsigned char r2, g2, b2;
int stream_ptr = 0;
unsigned char rle_code;
unsigned char extra_byte;
unsigned char stream_byte;
int frame_size = width * height * bytes_per_pixel;
int pixel_ptr = 0;
int row_dec = width * bytes_per_pixel;
int row_ptr = (height - 1) * row_dec;
int i;
while (row_ptr >= 0)
{
FETCH_NEXT_STREAM_BYTE();
rle_code = stream_byte;
if (rle_code == 0)
{
// fetch the next byte to see how to handle escape code
FETCH_NEXT_STREAM_BYTE();
if (stream_byte == 0)
{
// line is done, goto the next one
row_ptr -= row_dec;
pixel_ptr = 0;
}
else if (stream_byte == 1)
// decode is done
return;
else if (stream_byte == 2)
{
// reposition frame decode coordinates
FETCH_NEXT_STREAM_BYTE();
pixel_ptr += stream_byte * bytes_per_pixel;
FETCH_NEXT_STREAM_BYTE();
row_ptr -= stream_byte * row_dec;
}
else
{
// copy pixels from encoded stream
rle_code = stream_byte;
rle_code /= 2;
extra_byte = rle_code & 0x01;
if ((row_ptr + pixel_ptr + rle_code * bytes_per_pixel > frame_size) ||
(row_ptr < 0))
{
mp_msg(MSGT_DECVIDEO, MSGL_WARN,
"MS RLE: frame ptr just went out of bounds (1)\n");
return;
}
for (i = 0; i < rle_code; i++)
{
if (pixel_ptr >= row_dec)
break;
r1 = palette_map[(encoded[stream_ptr + i] >> 4) * 4 + 2];
g1 = palette_map[(encoded[stream_ptr + i] >> 4) * 4 + 1];
b1 = palette_map[(encoded[stream_ptr + i] >> 4) * 4 + 0];
decoded[row_ptr + pixel_ptr + 0] = b1;
decoded[row_ptr + pixel_ptr + 1] = g1;
decoded[row_ptr + pixel_ptr + 2] = r1;
pixel_ptr += bytes_per_pixel;
if (pixel_ptr >= row_dec)
break;
r1 = palette_map[(encoded[stream_ptr + i] & 0x0F) * 4 + 2];
g1 = palette_map[(encoded[stream_ptr + i] & 0x0F) * 4 + 1];
b1 = palette_map[(encoded[stream_ptr + i] & 0x0F) * 4 + 0];
decoded[row_ptr + pixel_ptr + 0] = b1;
decoded[row_ptr + pixel_ptr + 1] = g1;
decoded[row_ptr + pixel_ptr + 2] = r1;
pixel_ptr += bytes_per_pixel;
}
stream_ptr += rle_code;
// if the RLE code is odd, skip a byte in the stream
if (extra_byte)
stream_ptr++;
}
}
else
{
// decode a run of data
FETCH_NEXT_STREAM_BYTE();
r1 = palette_map[(stream_byte >> 4) * 4 + 2];
g1 = palette_map[(stream_byte >> 4) * 4 + 1];
b1 = palette_map[(stream_byte >> 4) * 4 + 0];
r2 = palette_map[(stream_byte & 0x0F) * 4 + 2];
g2 = palette_map[(stream_byte & 0x0F) * 4 + 1];
b2 = palette_map[(stream_byte & 0x0F) * 4 + 0];
for (i = 0; i < rle_code; i++)
{
if (pixel_ptr >= row_dec)
break;
if ((i & 1) == 0)
{
decoded[row_ptr + pixel_ptr + 0] = b1;
decoded[row_ptr + pixel_ptr + 1] = g1;
decoded[row_ptr + pixel_ptr + 2] = r1;
}
else
{
decoded[row_ptr + pixel_ptr + 0] = b2;
decoded[row_ptr + pixel_ptr + 1] = g2;
decoded[row_ptr + pixel_ptr + 2] = r2;
}
pixel_ptr += bytes_per_pixel;
}
}
}
// one last sanity check on the way out
if (stream_ptr < encoded_size)
mp_msg(MSGT_DECVIDEO, MSGL_WARN,
"MS RLE: ended frame decode with bytes left over (%d < %d)\n",
stream_ptr, encoded_size);
}
void decode_msrle8(
unsigned char *encoded,
int encoded_size,
unsigned char *decoded,
int width,
int height,
unsigned char *palette_map,
int bits_per_pixel)
{
int bytes_per_pixel = (bits_per_pixel + 1) / 8;
unsigned char r, g, b;
int stream_ptr = 0;
unsigned char rle_code;
unsigned char extra_byte;
unsigned char stream_byte;
int frame_size = width * height * bytes_per_pixel;
int pixel_ptr = 0;
int row_dec = width * bytes_per_pixel;
int row_ptr = (height - 1) * row_dec;
while (row_ptr >= 0)
{
FETCH_NEXT_STREAM_BYTE();
rle_code = stream_byte;
if (rle_code == 0)
{
// fetch the next byte to see how to handle escape code
FETCH_NEXT_STREAM_BYTE();
if (stream_byte == 0)
{
// line is done, goto the next one
row_ptr -= row_dec;
pixel_ptr = 0;
}
else if (stream_byte == 1)
// decode is done
return;
else if (stream_byte == 2)
{
// reposition frame decode coordinates
FETCH_NEXT_STREAM_BYTE();
pixel_ptr += stream_byte * bytes_per_pixel;
FETCH_NEXT_STREAM_BYTE();
row_ptr -= stream_byte * row_dec;
}
else
{
// copy pixels from encoded stream
if ((row_ptr + pixel_ptr + stream_byte * bytes_per_pixel > frame_size) ||
(row_ptr < 0))
{
mp_msg(MSGT_DECVIDEO, MSGL_WARN,
"MS RLE: frame ptr just went out of bounds (1)\n");
return;
}
rle_code = stream_byte;
extra_byte = stream_byte & 0x01;
if (stream_ptr + rle_code + extra_byte > encoded_size)
{
mp_msg(MSGT_DECVIDEO, MSGL_WARN,
"MS RLE: stream ptr just went out of bounds (2)\n");
return;
}
while (rle_code--)
{
r = palette_map[encoded[stream_ptr] * 4 + 2];
g = palette_map[encoded[stream_ptr] * 4 + 1];
b = palette_map[encoded[stream_ptr] * 4 + 0];
stream_ptr++;
decoded[row_ptr + pixel_ptr + 0] = b;
decoded[row_ptr + pixel_ptr + 1] = g;
decoded[row_ptr + pixel_ptr + 2] = r;
pixel_ptr += bytes_per_pixel;
}
// if the RLE code is odd, skip a byte in the stream
if (extra_byte)
stream_ptr++;
}
}
else
{
// decode a run of data
if ((row_ptr + pixel_ptr + stream_byte * bytes_per_pixel > frame_size) ||
(row_ptr < 0))
{
mp_msg(MSGT_DECVIDEO, MSGL_WARN,
"MS RLE: frame ptr just went out of bounds (2)\n");
return;
}
FETCH_NEXT_STREAM_BYTE();
r = palette_map[stream_byte * 4 + 2];
g = palette_map[stream_byte * 4 + 1];
b = palette_map[stream_byte * 4 + 0];
while(rle_code--)
{
decoded[row_ptr + pixel_ptr + 0] = b;
decoded[row_ptr + pixel_ptr + 1] = g;
decoded[row_ptr + pixel_ptr + 2] = r;
pixel_ptr += bytes_per_pixel;
}
}
}
// one last sanity check on the way out
if (stream_ptr < encoded_size)
mp_msg(MSGT_DECVIDEO, MSGL_WARN,
"MS RLE: ended frame decode with bytes left over (%d < %d)\n",
stream_ptr, encoded_size);
}
// decode a frame
static mp_image_t* decode(sh_video_t *sh,void* data,int len,int flags){
mp_image_t* mpi;
if(len<=0) return NULL; // skipped frame
mpi=mpcodecs_get_image(sh, MP_IMGTYPE_STATIC, MP_IMGFLAG_PRESERVE,
sh->disp_w, sh->disp_h);
if(!mpi) return NULL;
if (sh->format == 1)
decode_msrle8(
data,len, mpi->planes[0],
sh->disp_w, sh->disp_h,
(unsigned char *)sh->bih+40,
mpi->bpp);
else if (sh->format == 2)
decode_msrle4(
data,len, mpi->planes[0],
sh->disp_w, sh->disp_h,
(unsigned char *)sh->bih+40,
mpi->bpp);
else
mp_msg(MSGT_DECVIDEO, MSGL_WARN,
"MS RLE: Don't know how to decode format %08X", sh->format);
return mpi;
}
|
