1
by Reinhard Tartler
Import upstream version 0.6.2 |
1 |
/*
|
2 |
* CD Graphics Video Decoder
|
|
3 |
* Copyright (c) 2009 Michael Tison
|
|
4 |
*
|
|
1.1.1
by Reinhard Tartler
Import upstream version 0.7~b1 |
5 |
* This file is part of Libav.
|
1
by Reinhard Tartler
Import upstream version 0.6.2 |
6 |
*
|
1.1.1
by Reinhard Tartler
Import upstream version 0.7~b1 |
7 |
* Libav is free software; you can redistribute it and/or
|
1
by Reinhard Tartler
Import upstream version 0.6.2 |
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 |
*
|
|
1.1.1
by Reinhard Tartler
Import upstream version 0.7~b1 |
12 |
* Libav is distributed in the hope that it will be useful,
|
1
by Reinhard Tartler
Import upstream version 0.6.2 |
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
|
|
1.1.1
by Reinhard Tartler
Import upstream version 0.7~b1 |
18 |
* License along with Libav; if not, write to the Free Software
|
1
by Reinhard Tartler
Import upstream version 0.6.2 |
19 |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
20 |
*/
|
|
21 |
||
22 |
#include "avcodec.h" |
|
23 |
#include "bytestream.h" |
|
1.1.14
by Reinhard Tartler
Import upstream version 9~beta3 |
24 |
#include "internal.h" |
1
by Reinhard Tartler
Import upstream version 0.6.2 |
25 |
|
26 |
/**
|
|
27 |
* @file
|
|
28 |
* @brief CD Graphics Video Decoder
|
|
29 |
* @author Michael Tison
|
|
1.2.1
by Reinhard Tartler
Import upstream version 0.8~beta1 |
30 |
* @see http://wiki.multimedia.cx/index.php?title=CD_Graphics
|
31 |
* @see http://www.ccs.neu.edu/home/bchafy/cdb/info/cdg
|
|
1
by Reinhard Tartler
Import upstream version 0.6.2 |
32 |
*/
|
33 |
||
34 |
/// default screen sizes
|
|
35 |
#define CDG_FULL_WIDTH 300
|
|
36 |
#define CDG_FULL_HEIGHT 216
|
|
37 |
#define CDG_DISPLAY_WIDTH 294
|
|
38 |
#define CDG_DISPLAY_HEIGHT 204
|
|
39 |
#define CDG_BORDER_WIDTH 6
|
|
40 |
#define CDG_BORDER_HEIGHT 12
|
|
41 |
||
42 |
/// masks
|
|
43 |
#define CDG_COMMAND 0x09
|
|
44 |
#define CDG_MASK 0x3F
|
|
45 |
||
46 |
/// instruction codes
|
|
47 |
#define CDG_INST_MEMORY_PRESET 1
|
|
48 |
#define CDG_INST_BORDER_PRESET 2
|
|
49 |
#define CDG_INST_TILE_BLOCK 6
|
|
50 |
#define CDG_INST_SCROLL_PRESET 20
|
|
51 |
#define CDG_INST_SCROLL_COPY 24
|
|
52 |
#define CDG_INST_LOAD_PAL_LO 30
|
|
53 |
#define CDG_INST_LOAD_PAL_HIGH 31
|
|
54 |
#define CDG_INST_TILE_BLOCK_XOR 38
|
|
55 |
||
56 |
/// data sizes
|
|
57 |
#define CDG_PACKET_SIZE 24
|
|
58 |
#define CDG_DATA_SIZE 16
|
|
59 |
#define CDG_TILE_HEIGHT 12
|
|
60 |
#define CDG_TILE_WIDTH 6
|
|
61 |
#define CDG_MINIMUM_PKT_SIZE 6
|
|
62 |
#define CDG_MINIMUM_SCROLL_SIZE 3
|
|
63 |
#define CDG_HEADER_SIZE 8
|
|
64 |
#define CDG_PALETTE_SIZE 16
|
|
65 |
||
66 |
typedef struct CDGraphicsContext { |
|
1.1.23
by Reinhard Tartler
Import upstream version 10~alpha1 |
67 |
AVFrame *frame; |
1
by Reinhard Tartler
Import upstream version 0.6.2 |
68 |
int hscroll; |
69 |
int vscroll; |
|
70 |
} CDGraphicsContext; |
|
71 |
||
72 |
static av_cold int cdg_decode_init(AVCodecContext *avctx) |
|
73 |
{
|
|
74 |
CDGraphicsContext *cc = avctx->priv_data; |
|
75 |
||
1.1.23
by Reinhard Tartler
Import upstream version 10~alpha1 |
76 |
cc->frame = av_frame_alloc(); |
77 |
if (!cc->frame) |
|
78 |
return AVERROR(ENOMEM); |
|
1
by Reinhard Tartler
Import upstream version 0.6.2 |
79 |
|
80 |
avctx->width = CDG_FULL_WIDTH; |
|
81 |
avctx->height = CDG_FULL_HEIGHT; |
|
1.1.12
by Reinhard Tartler
Import upstream version 9~beta1 |
82 |
avctx->pix_fmt = AV_PIX_FMT_PAL8; |
1
by Reinhard Tartler
Import upstream version 0.6.2 |
83 |
|
84 |
return 0; |
|
85 |
}
|
|
86 |
||
87 |
static void cdg_border_preset(CDGraphicsContext *cc, uint8_t *data) |
|
88 |
{
|
|
89 |
int y; |
|
1.1.23
by Reinhard Tartler
Import upstream version 10~alpha1 |
90 |
int lsize = cc->frame->linesize[0]; |
91 |
uint8_t *buf = cc->frame->data[0]; |
|
1
by Reinhard Tartler
Import upstream version 0.6.2 |
92 |
int color = data[0] & 0x0F; |
93 |
||
94 |
if (!(data[1] & 0x0F)) { |
|
95 |
/// fill the top and bottom borders
|
|
96 |
memset(buf, color, CDG_BORDER_HEIGHT * lsize); |
|
97 |
memset(buf + (CDG_FULL_HEIGHT - CDG_BORDER_HEIGHT) * lsize, |
|
98 |
color, CDG_BORDER_HEIGHT * lsize); |
|
99 |
||
100 |
/// fill the side borders
|
|
101 |
for (y = CDG_BORDER_HEIGHT; y < CDG_FULL_HEIGHT - CDG_BORDER_HEIGHT; y++) { |
|
102 |
memset(buf + y * lsize, color, CDG_BORDER_WIDTH); |
|
103 |
memset(buf + CDG_FULL_WIDTH - CDG_BORDER_WIDTH + y * lsize, |
|
104 |
color, CDG_BORDER_WIDTH); |
|
105 |
}
|
|
106 |
}
|
|
107 |
}
|
|
108 |
||
109 |
static void cdg_load_palette(CDGraphicsContext *cc, uint8_t *data, int low) |
|
110 |
{
|
|
111 |
uint8_t r, g, b; |
|
112 |
uint16_t color; |
|
113 |
int i; |
|
114 |
int array_offset = low ? 0 : 8; |
|
1.1.23
by Reinhard Tartler
Import upstream version 10~alpha1 |
115 |
uint32_t *palette = (uint32_t *) cc->frame->data[1]; |
1
by Reinhard Tartler
Import upstream version 0.6.2 |
116 |
|
117 |
for (i = 0; i < 8; i++) { |
|
118 |
color = (data[2 * i] << 6) + (data[2 * i + 1] & 0x3F); |
|
119 |
r = ((color >> 8) & 0x000F) * 17; |
|
120 |
g = ((color >> 4) & 0x000F) * 17; |
|
121 |
b = ((color ) & 0x000F) * 17; |
|
122 |
palette[i + array_offset] = r << 16 | g << 8 | b; |
|
123 |
}
|
|
1.1.23
by Reinhard Tartler
Import upstream version 10~alpha1 |
124 |
cc->frame->palette_has_changed = 1; |
1
by Reinhard Tartler
Import upstream version 0.6.2 |
125 |
}
|
126 |
||
127 |
static int cdg_tile_block(CDGraphicsContext *cc, uint8_t *data, int b) |
|
128 |
{
|
|
129 |
unsigned ci, ri; |
|
130 |
int color; |
|
131 |
int x, y; |
|
132 |
int ai; |
|
1.1.23
by Reinhard Tartler
Import upstream version 10~alpha1 |
133 |
int stride = cc->frame->linesize[0]; |
134 |
uint8_t *buf = cc->frame->data[0]; |
|
1
by Reinhard Tartler
Import upstream version 0.6.2 |
135 |
|
136 |
ri = (data[2] & 0x1F) * CDG_TILE_HEIGHT + cc->vscroll; |
|
137 |
ci = (data[3] & 0x3F) * CDG_TILE_WIDTH + cc->hscroll; |
|
138 |
||
139 |
if (ri > (CDG_FULL_HEIGHT - CDG_TILE_HEIGHT)) |
|
140 |
return AVERROR(EINVAL); |
|
141 |
if (ci > (CDG_FULL_WIDTH - CDG_TILE_WIDTH)) |
|
142 |
return AVERROR(EINVAL); |
|
143 |
||
144 |
for (y = 0; y < CDG_TILE_HEIGHT; y++) { |
|
145 |
for (x = 0; x < CDG_TILE_WIDTH; x++) { |
|
146 |
if (!((data[4 + y] >> (5 - x)) & 0x01)) |
|
147 |
color = data[0] & 0x0F; |
|
148 |
else
|
|
149 |
color = data[1] & 0x0F; |
|
150 |
||
151 |
ai = ci + x + (stride * (ri + y)); |
|
152 |
if (b) |
|
153 |
color ^= buf[ai]; |
|
154 |
buf[ai] = color; |
|
155 |
}
|
|
156 |
}
|
|
157 |
||
158 |
return 0; |
|
159 |
}
|
|
160 |
||
161 |
#define UP 2
|
|
162 |
#define DOWN 1
|
|
163 |
#define LEFT 2
|
|
164 |
#define RIGHT 1
|
|
165 |
||
166 |
static void cdg_copy_rect_buf(int out_tl_x, int out_tl_y, uint8_t *out, |
|
167 |
int in_tl_x, int in_tl_y, uint8_t *in, |
|
168 |
int w, int h, int stride) |
|
169 |
{
|
|
170 |
int y; |
|
171 |
||
172 |
in += in_tl_x + in_tl_y * stride; |
|
173 |
out += out_tl_x + out_tl_y * stride; |
|
174 |
for (y = 0; y < h; y++) |
|
175 |
memcpy(out + y * stride, in + y * stride, w); |
|
176 |
}
|
|
177 |
||
178 |
static void cdg_fill_rect_preset(int tl_x, int tl_y, uint8_t *out, |
|
179 |
int color, int w, int h, int stride) |
|
180 |
{
|
|
181 |
int y; |
|
182 |
||
183 |
for (y = tl_y; y < tl_y + h; y++) |
|
184 |
memset(out + tl_x + y * stride, color, w); |
|
185 |
}
|
|
186 |
||
187 |
static void cdg_fill_wrapper(int out_tl_x, int out_tl_y, uint8_t *out, |
|
188 |
int in_tl_x, int in_tl_y, uint8_t *in, |
|
189 |
int color, int w, int h, int stride, int roll) |
|
190 |
{
|
|
191 |
if (roll) { |
|
192 |
cdg_copy_rect_buf(out_tl_x, out_tl_y, out, in_tl_x, in_tl_y, |
|
193 |
in, w, h, stride); |
|
194 |
} else { |
|
195 |
cdg_fill_rect_preset(out_tl_x, out_tl_y, out, color, w, h, stride); |
|
196 |
}
|
|
197 |
}
|
|
198 |
||
199 |
static void cdg_scroll(CDGraphicsContext *cc, uint8_t *data, |
|
200 |
AVFrame *new_frame, int roll_over) |
|
201 |
{
|
|
202 |
int color; |
|
203 |
int hscmd, h_off, hinc, vscmd, v_off, vinc; |
|
204 |
int y; |
|
1.1.23
by Reinhard Tartler
Import upstream version 10~alpha1 |
205 |
int stride = cc->frame->linesize[0]; |
206 |
uint8_t *in = cc->frame->data[0]; |
|
1
by Reinhard Tartler
Import upstream version 0.6.2 |
207 |
uint8_t *out = new_frame->data[0]; |
208 |
||
209 |
color = data[0] & 0x0F; |
|
210 |
hscmd = (data[1] & 0x30) >> 4; |
|
211 |
vscmd = (data[2] & 0x30) >> 4; |
|
212 |
||
213 |
h_off = FFMIN(data[1] & 0x07, CDG_BORDER_WIDTH - 1); |
|
1.1.14
by Reinhard Tartler
Import upstream version 9~beta3 |
214 |
v_off = FFMIN(data[2] & 0x0F, CDG_BORDER_HEIGHT - 1); |
1
by Reinhard Tartler
Import upstream version 0.6.2 |
215 |
|
216 |
/// find the difference and save the offset for cdg_tile_block usage
|
|
217 |
hinc = h_off - cc->hscroll; |
|
218 |
vinc = v_off - cc->vscroll; |
|
219 |
cc->hscroll = h_off; |
|
220 |
cc->vscroll = v_off; |
|
221 |
||
222 |
if (vscmd == UP) |
|
223 |
vinc -= 12; |
|
224 |
if (vscmd == DOWN) |
|
225 |
vinc += 12; |
|
226 |
if (hscmd == LEFT) |
|
227 |
hinc -= 6; |
|
228 |
if (hscmd == RIGHT) |
|
229 |
hinc += 6; |
|
230 |
||
231 |
if (!hinc && !vinc) |
|
232 |
return; |
|
233 |
||
1.1.23
by Reinhard Tartler
Import upstream version 10~alpha1 |
234 |
memcpy(new_frame->data[1], cc->frame->data[1], CDG_PALETTE_SIZE * 4); |
1
by Reinhard Tartler
Import upstream version 0.6.2 |
235 |
|
236 |
for (y = FFMAX(0, vinc); y < FFMIN(CDG_FULL_HEIGHT + vinc, CDG_FULL_HEIGHT); y++) |
|
237 |
memcpy(out + FFMAX(0, hinc) + stride * y, |
|
238 |
in + FFMAX(0, hinc) - hinc + (y - vinc) * stride, |
|
239 |
FFMIN(stride + hinc, stride)); |
|
240 |
||
241 |
if (vinc > 0) |
|
242 |
cdg_fill_wrapper(0, 0, out, |
|
243 |
0, CDG_FULL_HEIGHT - vinc, in, color, |
|
244 |
stride, vinc, stride, roll_over); |
|
245 |
else if (vinc < 0) |
|
246 |
cdg_fill_wrapper(0, CDG_FULL_HEIGHT + vinc, out, |
|
247 |
0, 0, in, color, |
|
248 |
stride, -1 * vinc, stride, roll_over); |
|
249 |
||
250 |
if (hinc > 0) |
|
251 |
cdg_fill_wrapper(0, 0, out, |
|
252 |
CDG_FULL_WIDTH - hinc, 0, in, color, |
|
253 |
hinc, CDG_FULL_HEIGHT, stride, roll_over); |
|
254 |
else if (hinc < 0) |
|
255 |
cdg_fill_wrapper(CDG_FULL_WIDTH + hinc, 0, out, |
|
256 |
0, 0, in, color, |
|
257 |
-1 * hinc, CDG_FULL_HEIGHT, stride, roll_over); |
|
258 |
||
259 |
}
|
|
260 |
||
261 |
static int cdg_decode_frame(AVCodecContext *avctx, |
|
1.1.14
by Reinhard Tartler
Import upstream version 9~beta3 |
262 |
void *data, int *got_frame, AVPacket *avpkt) |
1
by Reinhard Tartler
Import upstream version 0.6.2 |
263 |
{
|
1.1.28
by Reinhard Tartler
Import upstream version 11~alpha1 |
264 |
GetByteContext gb; |
1
by Reinhard Tartler
Import upstream version 0.6.2 |
265 |
int buf_size = avpkt->size; |
266 |
int ret; |
|
267 |
uint8_t command, inst; |
|
268 |
uint8_t cdg_data[CDG_DATA_SIZE]; |
|
1.1.23
by Reinhard Tartler
Import upstream version 10~alpha1 |
269 |
AVFrame *frame = data; |
1
by Reinhard Tartler
Import upstream version 0.6.2 |
270 |
CDGraphicsContext *cc = avctx->priv_data; |
271 |
||
1.1.28
by Reinhard Tartler
Import upstream version 11~alpha1 |
272 |
bytestream2_init(&gb, avpkt->data, avpkt->size); |
273 |
||
1
by Reinhard Tartler
Import upstream version 0.6.2 |
274 |
|
1.1.23
by Reinhard Tartler
Import upstream version 10~alpha1 |
275 |
ret = ff_reget_buffer(avctx, cc->frame); |
1
by Reinhard Tartler
Import upstream version 0.6.2 |
276 |
if (ret) { |
277 |
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); |
|
278 |
return ret; |
|
279 |
}
|
|
1.1.23
by Reinhard Tartler
Import upstream version 10~alpha1 |
280 |
if (!avctx->frame_number) |
281 |
memset(cc->frame->data[0], 0, cc->frame->linesize[0] * avctx->height); |
|
1
by Reinhard Tartler
Import upstream version 0.6.2 |
282 |
|
1.1.28
by Reinhard Tartler
Import upstream version 11~alpha1 |
283 |
command = bytestream2_get_byte(&gb); |
284 |
inst = bytestream2_get_byte(&gb); |
|
1
by Reinhard Tartler
Import upstream version 0.6.2 |
285 |
inst &= CDG_MASK; |
1.1.28
by Reinhard Tartler
Import upstream version 11~alpha1 |
286 |
bytestream2_skip(&gb, 2); |
287 |
bytestream2_get_buffer(&gb, cdg_data, sizeof(cdg_data)); |
|
1
by Reinhard Tartler
Import upstream version 0.6.2 |
288 |
|
289 |
if ((command & CDG_MASK) == CDG_COMMAND) { |
|
290 |
switch (inst) { |
|
291 |
case CDG_INST_MEMORY_PRESET: |
|
292 |
if (!(cdg_data[1] & 0x0F)) |
|
1.1.23
by Reinhard Tartler
Import upstream version 10~alpha1 |
293 |
memset(cc->frame->data[0], cdg_data[0] & 0x0F, |
294 |
cc->frame->linesize[0] * CDG_FULL_HEIGHT); |
|
1
by Reinhard Tartler
Import upstream version 0.6.2 |
295 |
break; |
296 |
case CDG_INST_LOAD_PAL_LO: |
|
297 |
case CDG_INST_LOAD_PAL_HIGH: |
|
298 |
if (buf_size - CDG_HEADER_SIZE < CDG_DATA_SIZE) { |
|
299 |
av_log(avctx, AV_LOG_ERROR, "buffer too small for loading palette\n"); |
|
300 |
return AVERROR(EINVAL); |
|
301 |
}
|
|
302 |
||
303 |
cdg_load_palette(cc, cdg_data, inst == CDG_INST_LOAD_PAL_LO); |
|
304 |
break; |
|
305 |
case CDG_INST_BORDER_PRESET: |
|
306 |
cdg_border_preset(cc, cdg_data); |
|
307 |
break; |
|
308 |
case CDG_INST_TILE_BLOCK_XOR: |
|
309 |
case CDG_INST_TILE_BLOCK: |
|
310 |
if (buf_size - CDG_HEADER_SIZE < CDG_DATA_SIZE) { |
|
311 |
av_log(avctx, AV_LOG_ERROR, "buffer too small for drawing tile\n"); |
|
312 |
return AVERROR(EINVAL); |
|
313 |
}
|
|
314 |
||
315 |
ret = cdg_tile_block(cc, cdg_data, inst == CDG_INST_TILE_BLOCK_XOR); |
|
316 |
if (ret) { |
|
317 |
av_log(avctx, AV_LOG_ERROR, "tile is out of range\n"); |
|
318 |
return ret; |
|
319 |
}
|
|
320 |
break; |
|
321 |
case CDG_INST_SCROLL_PRESET: |
|
322 |
case CDG_INST_SCROLL_COPY: |
|
323 |
if (buf_size - CDG_HEADER_SIZE < CDG_MINIMUM_SCROLL_SIZE) { |
|
324 |
av_log(avctx, AV_LOG_ERROR, "buffer too small for scrolling\n"); |
|
325 |
return AVERROR(EINVAL); |
|
326 |
}
|
|
327 |
||
1.1.23
by Reinhard Tartler
Import upstream version 10~alpha1 |
328 |
ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF); |
1
by Reinhard Tartler
Import upstream version 0.6.2 |
329 |
if (ret) { |
330 |
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
|
331 |
return ret; |
|
332 |
}
|
|
333 |
||
1.1.23
by Reinhard Tartler
Import upstream version 10~alpha1 |
334 |
cdg_scroll(cc, cdg_data, frame, inst == CDG_INST_SCROLL_COPY); |
335 |
av_frame_unref(cc->frame); |
|
336 |
ret = av_frame_ref(cc->frame, frame); |
|
337 |
if (ret < 0) |
|
338 |
return ret; |
|
1
by Reinhard Tartler
Import upstream version 0.6.2 |
339 |
break; |
340 |
default: |
|
341 |
break; |
|
342 |
}
|
|
343 |
||
1.1.23
by Reinhard Tartler
Import upstream version 10~alpha1 |
344 |
if (!frame->data[0]) { |
345 |
ret = av_frame_ref(frame, cc->frame); |
|
346 |
if (ret < 0) |
|
347 |
return ret; |
|
348 |
}
|
|
1.1.14
by Reinhard Tartler
Import upstream version 9~beta3 |
349 |
*got_frame = 1; |
1
by Reinhard Tartler
Import upstream version 0.6.2 |
350 |
} else { |
1.1.14
by Reinhard Tartler
Import upstream version 9~beta3 |
351 |
*got_frame = 0; |
1
by Reinhard Tartler
Import upstream version 0.6.2 |
352 |
}
|
353 |
||
1.1.28
by Reinhard Tartler
Import upstream version 11~alpha1 |
354 |
return avpkt->size; |
1
by Reinhard Tartler
Import upstream version 0.6.2 |
355 |
}
|
356 |
||
357 |
static av_cold int cdg_decode_end(AVCodecContext *avctx) |
|
358 |
{
|
|
359 |
CDGraphicsContext *cc = avctx->priv_data; |
|
360 |
||
1.1.23
by Reinhard Tartler
Import upstream version 10~alpha1 |
361 |
av_frame_free(&cc->frame); |
1
by Reinhard Tartler
Import upstream version 0.6.2 |
362 |
|
363 |
return 0; |
|
364 |
}
|
|
365 |
||
1.1.1
by Reinhard Tartler
Import upstream version 0.7~b1 |
366 |
AVCodec ff_cdgraphics_decoder = { |
1.2.1
by Reinhard Tartler
Import upstream version 0.8~beta1 |
367 |
.name = "cdgraphics", |
1.1.23
by Reinhard Tartler
Import upstream version 10~alpha1 |
368 |
.long_name = NULL_IF_CONFIG_SMALL("CD Graphics video"), |
1.2.1
by Reinhard Tartler
Import upstream version 0.8~beta1 |
369 |
.type = AVMEDIA_TYPE_VIDEO, |
1.1.12
by Reinhard Tartler
Import upstream version 9~beta1 |
370 |
.id = AV_CODEC_ID_CDGRAPHICS, |
1.2.1
by Reinhard Tartler
Import upstream version 0.8~beta1 |
371 |
.priv_data_size = sizeof(CDGraphicsContext), |
372 |
.init = cdg_decode_init, |
|
373 |
.close = cdg_decode_end, |
|
374 |
.decode = cdg_decode_frame, |
|
375 |
.capabilities = CODEC_CAP_DR1, |
|
1
by Reinhard Tartler
Import upstream version 0.6.2 |
376 |
};
|