| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 | 6 | ptrdiff_t lsize = cc->frame->linesize[0]; | |
| 94 | 6 | uint8_t *buf = cc->frame->data[0]; | |
| 95 | 6 | int color = data[0] & 0x0F; | |
| 96 | |||
| 97 |
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6 | if (!(data[1] & 0x0F)) { |
| 98 | /// fill the top and bottom borders | ||
| 99 |
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78 | for (int y = 0; y < CDG_BORDER_HEIGHT; y++) |
| 100 | 72 | memset(buf + y * lsize, color, cc->frame->width); | |
| 101 |
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78 | for (int y = CDG_FULL_HEIGHT-CDG_BORDER_HEIGHT; y < CDG_FULL_HEIGHT; y++) |
| 102 | 72 | memset(buf + y * lsize, color, cc->frame->width); | |
| 103 | |||
| 104 | /// fill the side borders | ||
| 105 |
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1158 | for (int 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 | } | |
| 129 | |||
| 130 | 189 | static int cdg_tile_block(CDGraphicsContext *cc, uint8_t *data, int b) | |
| 131 | { | ||
| 132 | unsigned ci, ri; | ||
| 133 | int color; | ||
| 134 | int x, y; | ||
| 135 | int ai; | ||
| 136 | 189 | ptrdiff_t stride = cc->frame->linesize[0]; | |
| 137 | 189 | uint8_t *buf = cc->frame->data[0]; | |
| 138 | |||
| 139 | 189 | ri = (data[2] & 0x1F) * CDG_TILE_HEIGHT + cc->vscroll; | |
| 140 | 189 | ci = (data[3] & 0x3F) * CDG_TILE_WIDTH + cc->hscroll; | |
| 141 | |||
| 142 |
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189 | if (ri > (CDG_FULL_HEIGHT - CDG_TILE_HEIGHT)) |
| 143 | ✗ | return AVERROR(EINVAL); | |
| 144 |
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189 | if (ci > (CDG_FULL_WIDTH - CDG_TILE_WIDTH)) |
| 145 | ✗ | return AVERROR(EINVAL); | |
| 146 | |||
| 147 |
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2457 | for (y = 0; y < CDG_TILE_HEIGHT; y++) { |
| 148 |
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15876 | for (x = 0; x < CDG_TILE_WIDTH; x++) { |
| 149 |
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13608 | if (!((data[4 + y] >> (5 - x)) & 0x01)) |
| 150 | 10669 | color = data[0] & 0x0F; | |
| 151 | else | ||
| 152 | 2939 | color = data[1] & 0x0F; | |
| 153 | |||
| 154 | 13608 | ai = ci + x + (stride * (ri + y)); | |
| 155 |
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13608 | if (b) |
| 156 | 13608 | color ^= buf[ai]; | |
| 157 | 13608 | buf[ai] = color; | |
| 158 | } | ||
| 159 | } | ||
| 160 | |||
| 161 | 189 | return 0; | |
| 162 | } | ||
| 163 | |||
| 164 | #define UP 2 | ||
| 165 | #define DOWN 1 | ||
| 166 | #define LEFT 2 | ||
| 167 | #define RIGHT 1 | ||
| 168 | |||
| 169 | ✗ | static void cdg_copy_rect_buf(int out_tl_x, int out_tl_y, uint8_t *out, | |
| 170 | int in_tl_x, int in_tl_y, uint8_t *in, | ||
| 171 | int w, int h, int stride) | ||
| 172 | { | ||
| 173 | int y; | ||
| 174 | |||
| 175 | ✗ | in += in_tl_x + in_tl_y * stride; | |
| 176 | ✗ | out += out_tl_x + out_tl_y * stride; | |
| 177 | ✗ | for (y = 0; y < h; y++) | |
| 178 | ✗ | memcpy(out + y * stride, in + y * stride, w); | |
| 179 | ✗ | } | |
| 180 | |||
| 181 | ✗ | static void cdg_fill_rect_preset(int tl_x, int tl_y, uint8_t *out, | |
| 182 | int color, int w, int h, int stride) | ||
| 183 | { | ||
| 184 | int y; | ||
| 185 | |||
| 186 | ✗ | for (y = tl_y; y < tl_y + h; y++) | |
| 187 | ✗ | memset(out + tl_x + y * stride, color, w); | |
| 188 | ✗ | } | |
| 189 | |||
| 190 | ✗ | static void cdg_fill_wrapper(int out_tl_x, int out_tl_y, uint8_t *out, | |
| 191 | int in_tl_x, int in_tl_y, uint8_t *in, | ||
| 192 | int color, int w, int h, int stride, int roll) | ||
| 193 | { | ||
| 194 | ✗ | if (roll) { | |
| 195 | ✗ | cdg_copy_rect_buf(out_tl_x, out_tl_y, out, in_tl_x, in_tl_y, | |
| 196 | in, w, h, stride); | ||
| 197 | } else { | ||
| 198 | ✗ | cdg_fill_rect_preset(out_tl_x, out_tl_y, out, color, w, h, stride); | |
| 199 | } | ||
| 200 | ✗ | } | |
| 201 | |||
| 202 | ✗ | static void cdg_scroll(CDGraphicsContext *cc, uint8_t *data, | |
| 203 | AVFrame *new_frame, int roll_over) | ||
| 204 | { | ||
| 205 | int color; | ||
| 206 | int hscmd, h_off, hinc, vscmd, v_off, vinc; | ||
| 207 | int y; | ||
| 208 | ✗ | ptrdiff_t stride = cc->frame->linesize[0]; | |
| 209 | ✗ | uint8_t *in = cc->frame->data[0]; | |
| 210 | ✗ | uint8_t *out = new_frame->data[0]; | |
| 211 | |||
| 212 | ✗ | color = data[0] & 0x0F; | |
| 213 | ✗ | hscmd = (data[1] & 0x30) >> 4; | |
| 214 | ✗ | vscmd = (data[2] & 0x30) >> 4; | |
| 215 | |||
| 216 | ✗ | h_off = FFMIN(data[1] & 0x07, CDG_BORDER_WIDTH - 1); | |
| 217 | ✗ | v_off = FFMIN(data[2] & 0x0F, CDG_BORDER_HEIGHT - 1); | |
| 218 | |||
| 219 | /// find the difference and save the offset for cdg_tile_block usage | ||
| 220 | ✗ | hinc = h_off - cc->hscroll; | |
| 221 | ✗ | vinc = cc->vscroll - v_off; | |
| 222 | ✗ | cc->hscroll = h_off; | |
| 223 | ✗ | cc->vscroll = v_off; | |
| 224 | |||
| 225 | ✗ | if (vscmd == UP) | |
| 226 | ✗ | vinc -= 12; | |
| 227 | ✗ | if (vscmd == DOWN) | |
| 228 | ✗ | vinc += 12; | |
| 229 | ✗ | if (hscmd == LEFT) | |
| 230 | ✗ | hinc -= 6; | |
| 231 | ✗ | if (hscmd == RIGHT) | |
| 232 | ✗ | hinc += 6; | |
| 233 | |||
| 234 | ✗ | if (!hinc && !vinc) | |
| 235 | ✗ | return; | |
| 236 | |||
| 237 | ✗ | memcpy(new_frame->data[1], cc->frame->data[1], CDG_PALETTE_SIZE * 4); | |
| 238 | |||
| 239 | ✗ | for (y = FFMAX(0, vinc); y < FFMIN(CDG_FULL_HEIGHT + vinc, CDG_FULL_HEIGHT); y++) | |
| 240 | ✗ | memcpy(out + FFMAX(0, hinc) + stride * y, | |
| 241 | ✗ | in + FFMAX(0, hinc) - hinc + (y - vinc) * stride, | |
| 242 | ✗ | FFABS(stride) - FFABS(hinc)); | |
| 243 | |||
| 244 | ✗ | if (vinc > 0) | |
| 245 | ✗ | cdg_fill_wrapper(0, 0, out, | |
| 246 | 0, CDG_FULL_HEIGHT - vinc, in, color, | ||
| 247 | ✗ | FFABS(stride), vinc, stride, roll_over); | |
| 248 | ✗ | else if (vinc < 0) | |
| 249 | ✗ | cdg_fill_wrapper(0, CDG_FULL_HEIGHT + vinc, out, | |
| 250 | 0, 0, in, color, | ||
| 251 | ✗ | FFABS(stride), -1 * vinc, stride, roll_over); | |
| 252 | |||
| 253 | ✗ | if (hinc > 0) | |
| 254 | ✗ | cdg_fill_wrapper(0, 0, out, | |
| 255 | CDG_FULL_WIDTH - hinc, 0, in, color, | ||
| 256 | hinc, CDG_FULL_HEIGHT, stride, roll_over); | ||
| 257 | ✗ | else if (hinc < 0) | |
| 258 | ✗ | cdg_fill_wrapper(CDG_FULL_WIDTH + hinc, 0, out, | |
| 259 | 0, 0, in, color, | ||
| 260 | -1 * hinc, CDG_FULL_HEIGHT, stride, roll_over); | ||
| 261 | |||
| 262 | } | ||
| 263 | |||
| 264 | 315 | static int cdg_decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| 265 | int *got_frame, AVPacket *avpkt) | ||
| 266 | { | ||
| 267 | GetByteContext gb; | ||
| 268 | 315 | int buf_size = avpkt->size; | |
| 269 | int ret; | ||
| 270 | uint8_t command, inst; | ||
| 271 | 315 | uint8_t cdg_data[CDG_DATA_SIZE] = {0}; | |
| 272 | 315 | CDGraphicsContext *cc = avctx->priv_data; | |
| 273 | |||
| 274 |
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315 | if (buf_size < CDG_MINIMUM_PKT_SIZE) { |
| 275 | ✗ | av_log(avctx, AV_LOG_ERROR, "buffer too small for decoder\n"); | |
| 276 | ✗ | return AVERROR(EINVAL); | |
| 277 | } | ||
| 278 |
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315 | if (buf_size > CDG_HEADER_SIZE + CDG_DATA_SIZE) { |
| 279 | ✗ | av_log(avctx, AV_LOG_ERROR, "buffer too big for decoder\n"); | |
| 280 | ✗ | return AVERROR(EINVAL); | |
| 281 | } | ||
| 282 | |||
| 283 | 315 | bytestream2_init(&gb, avpkt->data, avpkt->size); | |
| 284 | |||
| 285 |
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315 | if ((ret = ff_reget_buffer(avctx, cc->frame, 0)) < 0) |
| 286 | ✗ | return ret; | |
| 287 |
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315 | if (!cc->cleared) { |
| 288 |
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217 | for (int y = 0; y < avctx->height; y++) |
| 289 | 216 | memset(cc->frame->data[0] + y * cc->frame->linesize[0], 0, avctx->width); | |
| 290 | 1 | memset(cc->frame->data[1], 0, AVPALETTE_SIZE); | |
| 291 | 1 | cc->cleared = 1; | |
| 292 | } | ||
| 293 | |||
| 294 | 315 | command = bytestream2_get_byte(&gb); | |
| 295 | 315 | inst = bytestream2_get_byte(&gb); | |
| 296 | 315 | inst &= CDG_MASK; | |
| 297 | 315 | bytestream2_skip(&gb, 2); | |
| 298 | 315 | bytestream2_get_buffer(&gb, cdg_data, sizeof(cdg_data)); | |
| 299 | |||
| 300 |
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315 | if ((command & CDG_MASK) == CDG_COMMAND) { |
| 301 |
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222 | switch (inst) { |
| 302 | 16 | case CDG_INST_MEMORY_PRESET: | |
| 303 |
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16 | if (!(cdg_data[1] & 0x0F)) { |
| 304 |
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217 | for (int y = 0; y < avctx->height; y++) |
| 305 | 216 | memset(cc->frame->data[0] + y * cc->frame->linesize[0], | |
| 306 | 216 | cdg_data[0] & 0x0F, avctx->width); | |
| 307 | } | ||
| 308 | 16 | break; | |
| 309 | 10 | case CDG_INST_LOAD_PAL_LO: | |
| 310 | case CDG_INST_LOAD_PAL_HIGH: | ||
| 311 |
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10 | if (buf_size - CDG_HEADER_SIZE < CDG_DATA_SIZE) { |
| 312 | ✗ | av_log(avctx, AV_LOG_ERROR, "buffer too small for loading palette\n"); | |
| 313 | ✗ | return AVERROR(EINVAL); | |
| 314 | } | ||
| 315 | |||
| 316 | 10 | cdg_load_palette(cc, cdg_data, inst == CDG_INST_LOAD_PAL_LO); | |
| 317 | 10 | break; | |
| 318 | 6 | case CDG_INST_BORDER_PRESET: | |
| 319 | 6 | cdg_border_preset(cc, cdg_data); | |
| 320 | 6 | break; | |
| 321 | 189 | case CDG_INST_TILE_BLOCK_XOR: | |
| 322 | case CDG_INST_TILE_BLOCK: | ||
| 323 |
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189 | if (buf_size - CDG_HEADER_SIZE < CDG_DATA_SIZE) { |
| 324 | ✗ | av_log(avctx, AV_LOG_ERROR, "buffer too small for drawing tile\n"); | |
| 325 | ✗ | return AVERROR(EINVAL); | |
| 326 | } | ||
| 327 | |||
| 328 | 189 | ret = cdg_tile_block(cc, cdg_data, inst == CDG_INST_TILE_BLOCK_XOR); | |
| 329 |
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189 | if (ret) { |
| 330 | ✗ | av_log(avctx, AV_LOG_ERROR, "tile is out of range\n"); | |
| 331 | ✗ | return ret; | |
| 332 | } | ||
| 333 | 189 | break; | |
| 334 | ✗ | case CDG_INST_SCROLL_PRESET: | |
| 335 | case CDG_INST_SCROLL_COPY: | ||
| 336 | ✗ | if (buf_size - CDG_HEADER_SIZE < CDG_MINIMUM_SCROLL_SIZE) { | |
| 337 | ✗ | av_log(avctx, AV_LOG_ERROR, "buffer too small for scrolling\n"); | |
| 338 | ✗ | return AVERROR(EINVAL); | |
| 339 | } | ||
| 340 | |||
| 341 | ✗ | if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) | |
| 342 | ✗ | return ret; | |
| 343 | |||
| 344 | ✗ | cdg_scroll(cc, cdg_data, frame, inst == CDG_INST_SCROLL_COPY); | |
| 345 | ✗ | ret = av_frame_replace(cc->frame, frame); | |
| 346 | ✗ | if (ret < 0) | |
| 347 | ✗ | return ret; | |
| 348 | ✗ | break; | |
| 349 | 1 | case CDG_INST_TRANSPARENT_COL: | |
| 350 |
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17 | for (int i = 0; i < CDG_PALETTE_SIZE; i++) |
| 351 | 16 | cc->alpha[i] = 255 - ((cdg_data[i] & 0x3f) << 2); | |
| 352 | 1 | break; | |
| 353 | ✗ | default: | |
| 354 | ✗ | break; | |
| 355 | } | ||
| 356 | |||
| 357 |
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222 | if (!frame->data[0]) { |
| 358 | 222 | ret = av_frame_ref(frame, cc->frame); | |
| 359 |
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222 | if (ret < 0) |
| 360 | ✗ | return ret; | |
| 361 | } | ||
| 362 | 222 | *got_frame = 1; | |
| 363 | } else { | ||
| 364 | 93 | *got_frame = 0; | |
| 365 | } | ||
| 366 | |||
| 367 | 315 | return avpkt->size; | |
| 368 | } | ||
| 369 | |||
| 370 | ✗ | static void cdg_decode_flush(AVCodecContext *avctx) | |
| 371 | { | ||
| 372 | ✗ | CDGraphicsContext *cc = avctx->priv_data; | |
| 373 | |||
| 374 | ✗ | if (!cc->frame->data[0]) | |
| 375 | ✗ | return; | |
| 376 | |||
| 377 | ✗ | for (int y = 0; y < avctx->height; y++) | |
| 378 | ✗ | memset(cc->frame->data[0] + y * cc->frame->linesize[0], 0, avctx->width); | |
| 379 | ✗ | if (!avctx->frame_num) | |
| 380 | ✗ | memset(cc->frame->data[1], 0, AVPALETTE_SIZE); | |
| 381 | } | ||
| 382 | |||
| 383 | 2 | static av_cold int cdg_decode_end(AVCodecContext *avctx) | |
| 384 | { | ||
| 385 | 2 | CDGraphicsContext *cc = avctx->priv_data; | |
| 386 | |||
| 387 | 2 | av_frame_free(&cc->frame); | |
| 388 | |||
| 389 | 2 | return 0; | |
| 390 | } | ||
| 391 | |||
| 392 | const FFCodec ff_cdgraphics_decoder = { | ||
| 393 | .p.name = "cdgraphics", | ||
| 394 | CODEC_LONG_NAME("CD Graphics video"), | ||
| 395 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
| 396 | .p.id = AV_CODEC_ID_CDGRAPHICS, | ||
| 397 | .priv_data_size = sizeof(CDGraphicsContext), | ||
| 398 | .init = cdg_decode_init, | ||
| 399 | .close = cdg_decode_end, | ||
| 400 | FF_CODEC_DECODE_CB(cdg_decode_frame), | ||
| 401 | .flush = cdg_decode_flush, | ||
| 402 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
| 403 | }; | ||
| 404 |