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1 | /* | ||
2 | * CD Graphics Video Decoder | ||
3 | * Copyright (c) 2009 Michael Tison | ||
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 | #include "avcodec.h" | ||
23 | #include "bytestream.h" | ||
24 | #include "codec_internal.h" | ||
25 | #include "decode.h" | ||
26 | |||
27 | /** | ||
28 | * @file | ||
29 | * @brief CD Graphics Video Decoder | ||
30 | * @author Michael Tison | ||
31 | * @see http://wiki.multimedia.cx/index.php?title=CD_Graphics | ||
32 | * @see http://www.ccs.neu.edu/home/bchafy/cdb/info/cdg | ||
33 | */ | ||
34 | |||
35 | /// default screen sizes | ||
36 | #define CDG_FULL_WIDTH 300 | ||
37 | #define CDG_FULL_HEIGHT 216 | ||
38 | #define CDG_DISPLAY_WIDTH 294 | ||
39 | #define CDG_DISPLAY_HEIGHT 204 | ||
40 | #define CDG_BORDER_WIDTH 6 | ||
41 | #define CDG_BORDER_HEIGHT 12 | ||
42 | |||
43 | /// masks | ||
44 | #define CDG_COMMAND 0x09 | ||
45 | #define CDG_MASK 0x3F | ||
46 | |||
47 | /// instruction codes | ||
48 | #define CDG_INST_MEMORY_PRESET 1 | ||
49 | #define CDG_INST_BORDER_PRESET 2 | ||
50 | #define CDG_INST_TILE_BLOCK 6 | ||
51 | #define CDG_INST_SCROLL_PRESET 20 | ||
52 | #define CDG_INST_SCROLL_COPY 24 | ||
53 | #define CDG_INST_TRANSPARENT_COL 28 | ||
54 | #define CDG_INST_LOAD_PAL_LO 30 | ||
55 | #define CDG_INST_LOAD_PAL_HIGH 31 | ||
56 | #define CDG_INST_TILE_BLOCK_XOR 38 | ||
57 | |||
58 | /// data sizes | ||
59 | #define CDG_PACKET_SIZE 24 | ||
60 | #define CDG_DATA_SIZE 16 | ||
61 | #define CDG_TILE_HEIGHT 12 | ||
62 | #define CDG_TILE_WIDTH 6 | ||
63 | #define CDG_MINIMUM_PKT_SIZE 6 | ||
64 | #define CDG_MINIMUM_SCROLL_SIZE 3 | ||
65 | #define CDG_HEADER_SIZE 8 | ||
66 | #define CDG_PALETTE_SIZE 16 | ||
67 | |||
68 | typedef struct CDGraphicsContext { | ||
69 | AVFrame *frame; | ||
70 | int hscroll; | ||
71 | int vscroll; | ||
72 | uint8_t alpha[CDG_PALETTE_SIZE]; | ||
73 | int cleared; | ||
74 | } CDGraphicsContext; | ||
75 | |||
76 | 2 | static av_cold int cdg_decode_init(AVCodecContext *avctx) | |
77 | { | ||
78 | 2 | CDGraphicsContext *cc = avctx->priv_data; | |
79 | |||
80 | 2 | cc->frame = av_frame_alloc(); | |
81 |
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2 | if (!cc->frame) |
82 | ✗ | return AVERROR(ENOMEM); | |
83 | |||
84 |
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34 | for (int i = 0; i < CDG_PALETTE_SIZE; i++) |
85 | 32 | cc->alpha[i] = 0xFFU; | |
86 | |||
87 | 2 | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
88 | 2 | return ff_set_dimensions(avctx, CDG_FULL_WIDTH, CDG_FULL_HEIGHT); | |
89 | } | ||
90 | |||
91 | 6 | static void cdg_border_preset(CDGraphicsContext *cc, uint8_t *data) | |
92 | { | ||
93 | int y; | ||
94 | 6 | int lsize = cc->frame->linesize[0]; | |
95 | 6 | uint8_t *buf = cc->frame->data[0]; | |
96 | 6 | int color = data[0] & 0x0F; | |
97 | |||
98 |
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6 | if (!(data[1] & 0x0F)) { |
99 | /// fill the top and bottom borders | ||
100 | 6 | memset(buf, color, CDG_BORDER_HEIGHT * lsize); | |
101 | 6 | memset(buf + (CDG_FULL_HEIGHT - CDG_BORDER_HEIGHT) * lsize, | |
102 | 6 | color, CDG_BORDER_HEIGHT * lsize); | |
103 | |||
104 | /// fill the side borders | ||
105 |
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1158 | for (y = CDG_BORDER_HEIGHT; y < CDG_FULL_HEIGHT - CDG_BORDER_HEIGHT; y++) { |
106 | 1152 | memset(buf + y * lsize, color, CDG_BORDER_WIDTH); | |
107 | 1152 | memset(buf + CDG_FULL_WIDTH - CDG_BORDER_WIDTH + y * lsize, | |
108 | color, CDG_BORDER_WIDTH); | ||
109 | } | ||
110 | } | ||
111 | 6 | } | |
112 | |||
113 | 10 | static void cdg_load_palette(CDGraphicsContext *cc, uint8_t *data, int low) | |
114 | { | ||
115 | uint8_t r, g, b; | ||
116 | uint16_t color; | ||
117 | int i; | ||
118 |
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10 | int array_offset = low ? 0 : 8; |
119 | 10 | uint32_t *palette = (uint32_t *) cc->frame->data[1]; | |
120 | |||
121 |
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90 | for (i = 0; i < 8; i++) { |
122 | 80 | color = (data[2 * i] << 6) + (data[2 * i + 1] & 0x3F); | |
123 | 80 | r = ((color >> 8) & 0x000F) * 17; | |
124 | 80 | g = ((color >> 4) & 0x000F) * 17; | |
125 | 80 | b = ((color ) & 0x000F) * 17; | |
126 | 80 | palette[i + array_offset] = (uint32_t)cc->alpha[i + array_offset] << 24 | r << 16 | g << 8 | b; | |
127 | } | ||
128 | 10 | cc->frame->palette_has_changed = 1; | |
129 | 10 | } | |
130 | |||
131 | 180 | static int cdg_tile_block(CDGraphicsContext *cc, uint8_t *data, int b) | |
132 | { | ||
133 | unsigned ci, ri; | ||
134 | int color; | ||
135 | int x, y; | ||
136 | int ai; | ||
137 | 180 | int stride = cc->frame->linesize[0]; | |
138 | 180 | uint8_t *buf = cc->frame->data[0]; | |
139 | |||
140 | 180 | ri = (data[2] & 0x1F) * CDG_TILE_HEIGHT + cc->vscroll; | |
141 | 180 | ci = (data[3] & 0x3F) * CDG_TILE_WIDTH + cc->hscroll; | |
142 | |||
143 |
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180 | if (ri > (CDG_FULL_HEIGHT - CDG_TILE_HEIGHT)) |
144 | ✗ | return AVERROR(EINVAL); | |
145 |
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180 | if (ci > (CDG_FULL_WIDTH - CDG_TILE_WIDTH)) |
146 | ✗ | return AVERROR(EINVAL); | |
147 | |||
148 |
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2340 | for (y = 0; y < CDG_TILE_HEIGHT; y++) { |
149 |
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15120 | for (x = 0; x < CDG_TILE_WIDTH; x++) { |
150 |
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12960 | if (!((data[4 + y] >> (5 - x)) & 0x01)) |
151 | 10153 | color = data[0] & 0x0F; | |
152 | else | ||
153 | 2807 | color = data[1] & 0x0F; | |
154 | |||
155 | 12960 | ai = ci + x + (stride * (ri + y)); | |
156 |
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12960 | if (b) |
157 | 12960 | color ^= buf[ai]; | |
158 | 12960 | buf[ai] = color; | |
159 | } | ||
160 | } | ||
161 | |||
162 | 180 | return 0; | |
163 | } | ||
164 | |||
165 | #define UP 2 | ||
166 | #define DOWN 1 | ||
167 | #define LEFT 2 | ||
168 | #define RIGHT 1 | ||
169 | |||
170 | ✗ | static void cdg_copy_rect_buf(int out_tl_x, int out_tl_y, uint8_t *out, | |
171 | int in_tl_x, int in_tl_y, uint8_t *in, | ||
172 | int w, int h, int stride) | ||
173 | { | ||
174 | int y; | ||
175 | |||
176 | ✗ | in += in_tl_x + in_tl_y * stride; | |
177 | ✗ | out += out_tl_x + out_tl_y * stride; | |
178 | ✗ | for (y = 0; y < h; y++) | |
179 | ✗ | memcpy(out + y * stride, in + y * stride, w); | |
180 | } | ||
181 | |||
182 | ✗ | static void cdg_fill_rect_preset(int tl_x, int tl_y, uint8_t *out, | |
183 | int color, int w, int h, int stride) | ||
184 | { | ||
185 | int y; | ||
186 | |||
187 | ✗ | for (y = tl_y; y < tl_y + h; y++) | |
188 | ✗ | memset(out + tl_x + y * stride, color, w); | |
189 | } | ||
190 | |||
191 | ✗ | static void cdg_fill_wrapper(int out_tl_x, int out_tl_y, uint8_t *out, | |
192 | int in_tl_x, int in_tl_y, uint8_t *in, | ||
193 | int color, int w, int h, int stride, int roll) | ||
194 | { | ||
195 | ✗ | if (roll) { | |
196 | ✗ | cdg_copy_rect_buf(out_tl_x, out_tl_y, out, in_tl_x, in_tl_y, | |
197 | in, w, h, stride); | ||
198 | } else { | ||
199 | ✗ | cdg_fill_rect_preset(out_tl_x, out_tl_y, out, color, w, h, stride); | |
200 | } | ||
201 | } | ||
202 | |||
203 | ✗ | static void cdg_scroll(CDGraphicsContext *cc, uint8_t *data, | |
204 | AVFrame *new_frame, int roll_over) | ||
205 | { | ||
206 | int color; | ||
207 | int hscmd, h_off, hinc, vscmd, v_off, vinc; | ||
208 | int y; | ||
209 | ✗ | int stride = cc->frame->linesize[0]; | |
210 | ✗ | uint8_t *in = cc->frame->data[0]; | |
211 | ✗ | uint8_t *out = new_frame->data[0]; | |
212 | |||
213 | ✗ | color = data[0] & 0x0F; | |
214 | ✗ | hscmd = (data[1] & 0x30) >> 4; | |
215 | ✗ | vscmd = (data[2] & 0x30) >> 4; | |
216 | |||
217 | ✗ | h_off = FFMIN(data[1] & 0x07, CDG_BORDER_WIDTH - 1); | |
218 | ✗ | v_off = FFMIN(data[2] & 0x0F, CDG_BORDER_HEIGHT - 1); | |
219 | |||
220 | /// find the difference and save the offset for cdg_tile_block usage | ||
221 | ✗ | hinc = h_off - cc->hscroll; | |
222 | ✗ | vinc = cc->vscroll - v_off; | |
223 | ✗ | cc->hscroll = h_off; | |
224 | ✗ | cc->vscroll = v_off; | |
225 | |||
226 | ✗ | if (vscmd == UP) | |
227 | ✗ | vinc -= 12; | |
228 | ✗ | if (vscmd == DOWN) | |
229 | ✗ | vinc += 12; | |
230 | ✗ | if (hscmd == LEFT) | |
231 | ✗ | hinc -= 6; | |
232 | ✗ | if (hscmd == RIGHT) | |
233 | ✗ | hinc += 6; | |
234 | |||
235 | ✗ | if (!hinc && !vinc) | |
236 | ✗ | return; | |
237 | |||
238 | ✗ | memcpy(new_frame->data[1], cc->frame->data[1], CDG_PALETTE_SIZE * 4); | |
239 | |||
240 | ✗ | for (y = FFMAX(0, vinc); y < FFMIN(CDG_FULL_HEIGHT + vinc, CDG_FULL_HEIGHT); y++) | |
241 | ✗ | memcpy(out + FFMAX(0, hinc) + stride * y, | |
242 | ✗ | in + FFMAX(0, hinc) - hinc + (y - vinc) * stride, | |
243 | ✗ | FFABS(stride) - FFABS(hinc)); | |
244 | |||
245 | ✗ | if (vinc > 0) | |
246 | ✗ | cdg_fill_wrapper(0, 0, out, | |
247 | 0, CDG_FULL_HEIGHT - vinc, in, color, | ||
248 | stride, vinc, stride, roll_over); | ||
249 | ✗ | else if (vinc < 0) | |
250 | ✗ | cdg_fill_wrapper(0, CDG_FULL_HEIGHT + vinc, out, | |
251 | 0, 0, in, color, | ||
252 | stride, -1 * vinc, stride, roll_over); | ||
253 | |||
254 | ✗ | if (hinc > 0) | |
255 | ✗ | cdg_fill_wrapper(0, 0, out, | |
256 | CDG_FULL_WIDTH - hinc, 0, in, color, | ||
257 | hinc, CDG_FULL_HEIGHT, stride, roll_over); | ||
258 | ✗ | else if (hinc < 0) | |
259 | ✗ | cdg_fill_wrapper(CDG_FULL_WIDTH + hinc, 0, out, | |
260 | 0, 0, in, color, | ||
261 | -1 * hinc, CDG_FULL_HEIGHT, stride, roll_over); | ||
262 | |||
263 | } | ||
264 | |||
265 | 302 | static int cdg_decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
266 | int *got_frame, AVPacket *avpkt) | ||
267 | { | ||
268 | GetByteContext gb; | ||
269 | 302 | int buf_size = avpkt->size; | |
270 | int ret; | ||
271 | uint8_t command, inst; | ||
272 | 302 | uint8_t cdg_data[CDG_DATA_SIZE] = {0}; | |
273 | 302 | CDGraphicsContext *cc = avctx->priv_data; | |
274 | |||
275 |
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302 | if (buf_size < CDG_MINIMUM_PKT_SIZE) { |
276 | ✗ | av_log(avctx, AV_LOG_ERROR, "buffer too small for decoder\n"); | |
277 | ✗ | return AVERROR(EINVAL); | |
278 | } | ||
279 |
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302 | if (buf_size > CDG_HEADER_SIZE + CDG_DATA_SIZE) { |
280 | ✗ | av_log(avctx, AV_LOG_ERROR, "buffer too big for decoder\n"); | |
281 | ✗ | return AVERROR(EINVAL); | |
282 | } | ||
283 | |||
284 | 302 | bytestream2_init(&gb, avpkt->data, avpkt->size); | |
285 | |||
286 |
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302 | if ((ret = ff_reget_buffer(avctx, cc->frame, 0)) < 0) |
287 | ✗ | return ret; | |
288 |
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302 | if (!cc->cleared) { |
289 | 1 | memset(cc->frame->data[0], 0, cc->frame->linesize[0] * avctx->height); | |
290 | 1 | memset(cc->frame->data[1], 0, AVPALETTE_SIZE); | |
291 | 1 | cc->cleared = 1; | |
292 | } | ||
293 | |||
294 | 302 | command = bytestream2_get_byte(&gb); | |
295 | 302 | inst = bytestream2_get_byte(&gb); | |
296 | 302 | inst &= CDG_MASK; | |
297 | 302 | bytestream2_skip(&gb, 2); | |
298 | 302 | bytestream2_get_buffer(&gb, cdg_data, sizeof(cdg_data)); | |
299 | |||
300 |
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302 | if ((command & CDG_MASK) == CDG_COMMAND) { |
301 |
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213 | switch (inst) { |
302 | 16 | case CDG_INST_MEMORY_PRESET: | |
303 |
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16 | if (!(cdg_data[1] & 0x0F)) |
304 | 1 | memset(cc->frame->data[0], cdg_data[0] & 0x0F, | |
305 | 1 | cc->frame->linesize[0] * CDG_FULL_HEIGHT); | |
306 | 16 | break; | |
307 | 10 | case CDG_INST_LOAD_PAL_LO: | |
308 | case CDG_INST_LOAD_PAL_HIGH: | ||
309 |
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10 | if (buf_size - CDG_HEADER_SIZE < CDG_DATA_SIZE) { |
310 | ✗ | av_log(avctx, AV_LOG_ERROR, "buffer too small for loading palette\n"); | |
311 | ✗ | return AVERROR(EINVAL); | |
312 | } | ||
313 | |||
314 | 10 | cdg_load_palette(cc, cdg_data, inst == CDG_INST_LOAD_PAL_LO); | |
315 | 10 | break; | |
316 | 6 | case CDG_INST_BORDER_PRESET: | |
317 | 6 | cdg_border_preset(cc, cdg_data); | |
318 | 6 | break; | |
319 | 180 | case CDG_INST_TILE_BLOCK_XOR: | |
320 | case CDG_INST_TILE_BLOCK: | ||
321 |
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180 | if (buf_size - CDG_HEADER_SIZE < CDG_DATA_SIZE) { |
322 | ✗ | av_log(avctx, AV_LOG_ERROR, "buffer too small for drawing tile\n"); | |
323 | ✗ | return AVERROR(EINVAL); | |
324 | } | ||
325 | |||
326 | 180 | ret = cdg_tile_block(cc, cdg_data, inst == CDG_INST_TILE_BLOCK_XOR); | |
327 |
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180 | if (ret) { |
328 | ✗ | av_log(avctx, AV_LOG_ERROR, "tile is out of range\n"); | |
329 | ✗ | return ret; | |
330 | } | ||
331 | 180 | break; | |
332 | ✗ | case CDG_INST_SCROLL_PRESET: | |
333 | case CDG_INST_SCROLL_COPY: | ||
334 | ✗ | if (buf_size - CDG_HEADER_SIZE < CDG_MINIMUM_SCROLL_SIZE) { | |
335 | ✗ | av_log(avctx, AV_LOG_ERROR, "buffer too small for scrolling\n"); | |
336 | ✗ | return AVERROR(EINVAL); | |
337 | } | ||
338 | |||
339 | ✗ | if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) | |
340 | ✗ | return ret; | |
341 | |||
342 | ✗ | cdg_scroll(cc, cdg_data, frame, inst == CDG_INST_SCROLL_COPY); | |
343 | ✗ | av_frame_unref(cc->frame); | |
344 | ✗ | ret = av_frame_ref(cc->frame, frame); | |
345 | ✗ | if (ret < 0) | |
346 | ✗ | return ret; | |
347 | ✗ | break; | |
348 | 1 | case CDG_INST_TRANSPARENT_COL: | |
349 |
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17 | for (int i = 0; i < CDG_PALETTE_SIZE; i++) |
350 | 16 | cc->alpha[i] = 255 - ((cdg_data[i] & 0x3f) << 2); | |
351 | 1 | break; | |
352 | ✗ | default: | |
353 | ✗ | break; | |
354 | } | ||
355 | |||
356 |
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213 | if (!frame->data[0]) { |
357 | 213 | ret = av_frame_ref(frame, cc->frame); | |
358 |
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213 | if (ret < 0) |
359 | ✗ | return ret; | |
360 | } | ||
361 | 213 | *got_frame = 1; | |
362 | } else { | ||
363 | 89 | *got_frame = 0; | |
364 | } | ||
365 | |||
366 | 302 | return avpkt->size; | |
367 | } | ||
368 | |||
369 | ✗ | static void cdg_decode_flush(AVCodecContext *avctx) | |
370 | { | ||
371 | ✗ | CDGraphicsContext *cc = avctx->priv_data; | |
372 | |||
373 | ✗ | if (!cc->frame->data[0]) | |
374 | ✗ | return; | |
375 | |||
376 | ✗ | memset(cc->frame->data[0], 0, cc->frame->linesize[0] * avctx->height); | |
377 | ✗ | if (!avctx->frame_num) | |
378 | ✗ | memset(cc->frame->data[1], 0, AVPALETTE_SIZE); | |
379 | } | ||
380 | |||
381 | 2 | static av_cold int cdg_decode_end(AVCodecContext *avctx) | |
382 | { | ||
383 | 2 | CDGraphicsContext *cc = avctx->priv_data; | |
384 | |||
385 | 2 | av_frame_free(&cc->frame); | |
386 | |||
387 | 2 | return 0; | |
388 | } | ||
389 | |||
390 | const FFCodec ff_cdgraphics_decoder = { | ||
391 | .p.name = "cdgraphics", | ||
392 | CODEC_LONG_NAME("CD Graphics video"), | ||
393 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
394 | .p.id = AV_CODEC_ID_CDGRAPHICS, | ||
395 | .priv_data_size = sizeof(CDGraphicsContext), | ||
396 | .init = cdg_decode_init, | ||
397 | .close = cdg_decode_end, | ||
398 | FF_CODEC_DECODE_CB(cdg_decode_frame), | ||
399 | .flush = cdg_decode_flush, | ||
400 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
401 | }; | ||
402 |