x86: cabac: add operand size suffixes missing from 6c32576
[libav.git] / libavcodec / cdgraphics.c
CommitLineData
a3d995c1
MT
1/*
2 * CD Graphics Video Decoder
3 * Copyright (c) 2009 Michael Tison
4 *
2912e87a 5 * This file is part of Libav.
a3d995c1 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
a3d995c1
MT
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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
a3d995c1
MT
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
2912e87a 18 * License along with Libav; if not, write to the Free Software
a3d995c1
MT
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "avcodec.h"
23#include "bytestream.h"
24
25/**
ba87f080 26 * @file
a3d995c1
MT
27 * @brief CD Graphics Video Decoder
28 * @author Michael Tison
bee6d2fd
DB
29 * @see http://wiki.multimedia.cx/index.php?title=CD_Graphics
30 * @see http://www.ccs.neu.edu/home/bchafy/cdb/info/cdg
a3d995c1
MT
31 */
32
33/// default screen sizes
34#define CDG_FULL_WIDTH 300
35#define CDG_FULL_HEIGHT 216
36#define CDG_DISPLAY_WIDTH 294
37#define CDG_DISPLAY_HEIGHT 204
38#define CDG_BORDER_WIDTH 6
39#define CDG_BORDER_HEIGHT 12
40
41/// masks
42#define CDG_COMMAND 0x09
43#define CDG_MASK 0x3F
44
45/// instruction codes
46#define CDG_INST_MEMORY_PRESET 1
47#define CDG_INST_BORDER_PRESET 2
48#define CDG_INST_TILE_BLOCK 6
49#define CDG_INST_SCROLL_PRESET 20
50#define CDG_INST_SCROLL_COPY 24
51#define CDG_INST_LOAD_PAL_LO 30
52#define CDG_INST_LOAD_PAL_HIGH 31
53#define CDG_INST_TILE_BLOCK_XOR 38
54
55/// data sizes
56#define CDG_PACKET_SIZE 24
57#define CDG_DATA_SIZE 16
58#define CDG_TILE_HEIGHT 12
59#define CDG_TILE_WIDTH 6
60#define CDG_MINIMUM_PKT_SIZE 6
61#define CDG_MINIMUM_SCROLL_SIZE 3
62#define CDG_HEADER_SIZE 8
63#define CDG_PALETTE_SIZE 16
64
65typedef struct CDGraphicsContext {
66 AVFrame frame;
67 int hscroll;
68 int vscroll;
69} CDGraphicsContext;
70
71static void cdg_init_frame(AVFrame *frame)
72{
73 avcodec_get_frame_defaults(frame);
b03a63d1 74 frame->reference = 3;
a3d995c1 75 frame->buffer_hints = FF_BUFFER_HINTS_VALID |
b03a63d1 76 FF_BUFFER_HINTS_READABLE |
a3d995c1
MT
77 FF_BUFFER_HINTS_PRESERVE |
78 FF_BUFFER_HINTS_REUSABLE;
79}
80
81static av_cold int cdg_decode_init(AVCodecContext *avctx)
82{
83 CDGraphicsContext *cc = avctx->priv_data;
84
85 cdg_init_frame(&cc->frame);
86
87 avctx->width = CDG_FULL_WIDTH;
88 avctx->height = CDG_FULL_HEIGHT;
89 avctx->pix_fmt = PIX_FMT_PAL8;
90
91 return 0;
92}
93
94static void cdg_border_preset(CDGraphicsContext *cc, uint8_t *data)
95{
96 int y;
97 int lsize = cc->frame.linesize[0];
98 uint8_t *buf = cc->frame.data[0];
99 int color = data[0] & 0x0F;
100
101 if (!(data[1] & 0x0F)) {
102 /// fill the top and bottom borders
103 memset(buf, color, CDG_BORDER_HEIGHT * lsize);
104 memset(buf + (CDG_FULL_HEIGHT - CDG_BORDER_HEIGHT) * lsize,
105 color, CDG_BORDER_HEIGHT * lsize);
106
107 /// fill the side borders
108 for (y = CDG_BORDER_HEIGHT; y < CDG_FULL_HEIGHT - CDG_BORDER_HEIGHT; y++) {
109 memset(buf + y * lsize, color, CDG_BORDER_WIDTH);
110 memset(buf + CDG_FULL_WIDTH - CDG_BORDER_WIDTH + y * lsize,
111 color, CDG_BORDER_WIDTH);
112 }
113 }
114}
115
116static void cdg_load_palette(CDGraphicsContext *cc, uint8_t *data, int low)
117{
118 uint8_t r, g, b;
119 uint16_t color;
120 int i;
121 int array_offset = low ? 0 : 8;
122 uint32_t *palette = (uint32_t *) cc->frame.data[1];
123
124 for (i = 0; i < 8; i++) {
125 color = (data[2 * i] << 6) + (data[2 * i + 1] & 0x3F);
126 r = ((color >> 8) & 0x000F) * 17;
127 g = ((color >> 4) & 0x000F) * 17;
128 b = ((color ) & 0x000F) * 17;
129 palette[i + array_offset] = r << 16 | g << 8 | b;
130 }
131 cc->frame.palette_has_changed = 1;
132}
133
134static int cdg_tile_block(CDGraphicsContext *cc, uint8_t *data, int b)
135{
136 unsigned ci, ri;
137 int color;
138 int x, y;
139 int ai;
140 int stride = cc->frame.linesize[0];
141 uint8_t *buf = cc->frame.data[0];
142
143 ri = (data[2] & 0x1F) * CDG_TILE_HEIGHT + cc->vscroll;
144 ci = (data[3] & 0x3F) * CDG_TILE_WIDTH + cc->hscroll;
145
146 if (ri > (CDG_FULL_HEIGHT - CDG_TILE_HEIGHT))
147 return AVERROR(EINVAL);
148 if (ci > (CDG_FULL_WIDTH - CDG_TILE_WIDTH))
149 return AVERROR(EINVAL);
150
151 for (y = 0; y < CDG_TILE_HEIGHT; y++) {
152 for (x = 0; x < CDG_TILE_WIDTH; x++) {
153 if (!((data[4 + y] >> (5 - x)) & 0x01))
154 color = data[0] & 0x0F;
155 else
156 color = data[1] & 0x0F;
157
158 ai = ci + x + (stride * (ri + y));
159 if (b)
160 color ^= buf[ai];
161 buf[ai] = color;
162 }
163 }
164
165 return 0;
166}
167
168#define UP 2
169#define DOWN 1
170#define LEFT 2
171#define RIGHT 1
172
173static void cdg_copy_rect_buf(int out_tl_x, int out_tl_y, uint8_t *out,
174 int in_tl_x, int in_tl_y, uint8_t *in,
175 int w, int h, int stride)
176{
177 int y;
178
179 in += in_tl_x + in_tl_y * stride;
180 out += out_tl_x + out_tl_y * stride;
181 for (y = 0; y < h; y++)
182 memcpy(out + y * stride, in + y * stride, w);
183}
184
185static void cdg_fill_rect_preset(int tl_x, int tl_y, uint8_t *out,
186 int color, int w, int h, int stride)
187{
188 int y;
189
190 for (y = tl_y; y < tl_y + h; y++)
191 memset(out + tl_x + y * stride, color, w);
192}
193
194static void cdg_fill_wrapper(int out_tl_x, int out_tl_y, uint8_t *out,
195 int in_tl_x, int in_tl_y, uint8_t *in,
196 int color, int w, int h, int stride, int roll)
197{
198 if (roll) {
199 cdg_copy_rect_buf(out_tl_x, out_tl_y, out, in_tl_x, in_tl_y,
200 in, w, h, stride);
201 } else {
202 cdg_fill_rect_preset(out_tl_x, out_tl_y, out, color, w, h, stride);
203 }
204}
205
206static void cdg_scroll(CDGraphicsContext *cc, uint8_t *data,
207 AVFrame *new_frame, int roll_over)
208{
209 int color;
210 int hscmd, h_off, hinc, vscmd, v_off, vinc;
211 int y;
212 int stride = cc->frame.linesize[0];
213 uint8_t *in = cc->frame.data[0];
214 uint8_t *out = new_frame->data[0];
215
216 color = data[0] & 0x0F;
217 hscmd = (data[1] & 0x30) >> 4;
218 vscmd = (data[2] & 0x30) >> 4;
219
220 h_off = FFMIN(data[1] & 0x07, CDG_BORDER_WIDTH - 1);
221 v_off = FFMIN(data[2] & 0x07, CDG_BORDER_HEIGHT - 1);
222
223 /// find the difference and save the offset for cdg_tile_block usage
224 hinc = h_off - cc->hscroll;
225 vinc = v_off - cc->vscroll;
226 cc->hscroll = h_off;
227 cc->vscroll = v_off;
228
229 if (vscmd == UP)
230 vinc -= 12;
231 if (vscmd == DOWN)
232 vinc += 12;
233 if (hscmd == LEFT)
234 hinc -= 6;
235 if (hscmd == RIGHT)
236 hinc += 6;
237
238 if (!hinc && !vinc)
239 return;
240
241 memcpy(new_frame->data[1], cc->frame.data[1], CDG_PALETTE_SIZE * 4);
242
243 for (y = FFMAX(0, vinc); y < FFMIN(CDG_FULL_HEIGHT + vinc, CDG_FULL_HEIGHT); y++)
244 memcpy(out + FFMAX(0, hinc) + stride * y,
245 in + FFMAX(0, hinc) - hinc + (y - vinc) * stride,
246 FFMIN(stride + hinc, stride));
247
248 if (vinc > 0)
249 cdg_fill_wrapper(0, 0, out,
250 0, CDG_FULL_HEIGHT - vinc, in, color,
251 stride, vinc, stride, roll_over);
252 else if (vinc < 0)
253 cdg_fill_wrapper(0, CDG_FULL_HEIGHT + vinc, out,
254 0, 0, in, color,
255 stride, -1 * vinc, stride, roll_over);
256
257 if (hinc > 0)
258 cdg_fill_wrapper(0, 0, out,
259 CDG_FULL_WIDTH - hinc, 0, in, color,
260 hinc, CDG_FULL_HEIGHT, stride, roll_over);
261 else if (hinc < 0)
262 cdg_fill_wrapper(CDG_FULL_WIDTH + hinc, 0, out,
263 0, 0, in, color,
264 -1 * hinc, CDG_FULL_HEIGHT, stride, roll_over);
265
266}
267
268static int cdg_decode_frame(AVCodecContext *avctx,
269 void *data, int *data_size, AVPacket *avpkt)
270{
271 const uint8_t *buf = avpkt->data;
272 int buf_size = avpkt->size;
273 int ret;
274 uint8_t command, inst;
275 uint8_t cdg_data[CDG_DATA_SIZE];
276 AVFrame new_frame;
277 CDGraphicsContext *cc = avctx->priv_data;
278
279 if (buf_size < CDG_MINIMUM_PKT_SIZE) {
280 av_log(avctx, AV_LOG_ERROR, "buffer too small for decoder\n");
281 return AVERROR(EINVAL);
282 }
283
284 ret = avctx->reget_buffer(avctx, &cc->frame);
285 if (ret) {
286 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
287 return ret;
288 }
289
290 command = bytestream_get_byte(&buf);
291 inst = bytestream_get_byte(&buf);
292 inst &= CDG_MASK;
293 buf += 2; /// skipping 2 unneeded bytes
294 bytestream_get_buffer(&buf, cdg_data, buf_size - CDG_HEADER_SIZE);
295
296 if ((command & CDG_MASK) == CDG_COMMAND) {
297 switch (inst) {
298 case CDG_INST_MEMORY_PRESET:
299 if (!(cdg_data[1] & 0x0F))
300 memset(cc->frame.data[0], cdg_data[0] & 0x0F,
301 cc->frame.linesize[0] * CDG_FULL_HEIGHT);
302 break;
303 case CDG_INST_LOAD_PAL_LO:
304 case CDG_INST_LOAD_PAL_HIGH:
305 if (buf_size - CDG_HEADER_SIZE < CDG_DATA_SIZE) {
306 av_log(avctx, AV_LOG_ERROR, "buffer too small for loading palette\n");
307 return AVERROR(EINVAL);
308 }
309
310 cdg_load_palette(cc, cdg_data, inst == CDG_INST_LOAD_PAL_LO);
311 break;
312 case CDG_INST_BORDER_PRESET:
313 cdg_border_preset(cc, cdg_data);
314 break;
315 case CDG_INST_TILE_BLOCK_XOR:
316 case CDG_INST_TILE_BLOCK:
317 if (buf_size - CDG_HEADER_SIZE < CDG_DATA_SIZE) {
318 av_log(avctx, AV_LOG_ERROR, "buffer too small for drawing tile\n");
319 return AVERROR(EINVAL);
320 }
321
322 ret = cdg_tile_block(cc, cdg_data, inst == CDG_INST_TILE_BLOCK_XOR);
323 if (ret) {
324 av_log(avctx, AV_LOG_ERROR, "tile is out of range\n");
325 return ret;
326 }
327 break;
328 case CDG_INST_SCROLL_PRESET:
329 case CDG_INST_SCROLL_COPY:
330 if (buf_size - CDG_HEADER_SIZE < CDG_MINIMUM_SCROLL_SIZE) {
331 av_log(avctx, AV_LOG_ERROR, "buffer too small for scrolling\n");
332 return AVERROR(EINVAL);
333 }
334
335 cdg_init_frame(&new_frame);
336 ret = avctx->get_buffer(avctx, &new_frame);
337 if (ret) {
338 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
339 return ret;
340 }
341
342 cdg_scroll(cc, cdg_data, &new_frame, inst == CDG_INST_SCROLL_COPY);
343 avctx->release_buffer(avctx, &cc->frame);
344 cc->frame = new_frame;
345 break;
346 default:
347 break;
348 }
349
350 *data_size = sizeof(AVFrame);
351 } else {
352 *data_size = 0;
353 buf_size = 0;
354 }
355
356 *(AVFrame *) data = cc->frame;
357 return buf_size;
358}
359
360static av_cold int cdg_decode_end(AVCodecContext *avctx)
361{
362 CDGraphicsContext *cc = avctx->priv_data;
363
364 if (cc->frame.data[0])
365 avctx->release_buffer(avctx, &cc->frame);
366
367 return 0;
368}
369
d36beb3f 370AVCodec ff_cdgraphics_decoder = {
a3d995c1 371 "cdgraphics",
72415b2a 372 AVMEDIA_TYPE_VIDEO,
a3d995c1
MT
373 CODEC_ID_CDGRAPHICS,
374 sizeof(CDGraphicsContext),
375 cdg_decode_init,
376 NULL,
377 cdg_decode_end,
378 cdg_decode_frame,
379 CODEC_CAP_DR1,
380 .long_name = NULL_IF_CONFIG_SMALL("CD Graphics video"),
381};