1/* 2 * GEM Raster image decoder 3 * Copyright (c) 2021 Peter Ross (pross@xvid.org) 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/** 23 * @file 24 * GEM Raster image decoder 25 */ 26 27#include "avcodec.h" 28#include "bytestream.h" 29#include "codec_internal.h" 30#include "internal.h" 31 32static const uint32_t gem_color_palette[16]={ 33 0xFFFFFFFF, 0xFFFF0000, 0xFF00FF00, 0xFFFFFF00, 34 0xFF0000FF, 0xFFFF00FF, 0xFF00FFFF, 0xFFAEAEAE, 35 0xFF555555, 0xFFAE0000, 0xFF00AE00, 0xFFAEAE00, 36 0xFF0000AE, 0xFFAE00AE, 0xFF00AEAE, 0xFF000000, 37}; 38 39static const uint8_t gem_gray[256]={ 40 0xFF, 0x7F, 0xBF, 0x3F, 0xDF, 0x5F, 0x9F, 0x1F, 0xEF, 0x6F, 0xAF, 0x2F, 0xCF, 0x4F, 0x8F, 0x0F, 41 0xF7, 0x77, 0xB7, 0x37, 0xD7, 0x57, 0x97, 0x17, 0xE7, 0x67, 0xA7, 0x27, 0xC7, 0x47, 0x87, 0x07, 42 0xFB, 0x7B, 0xBB, 0x3B, 0xDB, 0x5B, 0x9B, 0x1B, 0xEB, 0x6B, 0xAB, 0x2B, 0xCB, 0x4B, 0x8B, 0x0B, 43 0xF3, 0x73, 0xB3, 0x33, 0xD3, 0x53, 0x93, 0x13, 0xE3, 0x63, 0xA3, 0x23, 0xC3, 0x43, 0x83, 0x03, 44 0xFD, 0x7D, 0xBD, 0x3D, 0xDD, 0x5D, 0x9D, 0x1D, 0xED, 0x6D, 0xAD, 0x2D, 0xCD, 0x4D, 0x8D, 0x0D, 45 0xF5, 0x75, 0xB5, 0x35, 0xD5, 0x55, 0x95, 0x15, 0xE5, 0x65, 0xA5, 0x25, 0xC5, 0x45, 0x85, 0x05, 46 0xF9, 0x79, 0xB9, 0x39, 0xD9, 0x59, 0x99, 0x19, 0xE9, 0x69, 0xA9, 0x29, 0xC9, 0x49, 0x89, 0x09, 47 0xF1, 0x71, 0xB1, 0x31, 0xD1, 0x51, 0x91, 0x11, 0xE1, 0x61, 0xA1, 0x21, 0xC1, 0x41, 0x81, 0x01, 48 0xFE, 0x7E, 0xBE, 0x3E, 0xDE, 0x5E, 0x9E, 0x1E, 0xEE, 0x6E, 0xAE, 0x2E, 0xCE, 0x4E, 0x8E, 0x0E, 49 0xF6, 0x76, 0xB6, 0x36, 0xD6, 0x56, 0x96, 0x16, 0xE6, 0x66, 0xA6, 0x26, 0xC6, 0x46, 0x86, 0x06, 50 0xFA, 0x7A, 0xBA, 0x3A, 0xDA, 0x5A, 0x9A, 0x1A, 0xEA, 0x6A, 0xAA, 0x2A, 0xCA, 0x4A, 0x8A, 0x0A, 51 0xF2, 0x72, 0xB2, 0x32, 0xD2, 0x52, 0x92, 0x12, 0xE2, 0x62, 0xA2, 0x22, 0xC2, 0x42, 0x82, 0x02, 52 0xFC, 0x7C, 0xBC, 0x3C, 0xDC, 0x5C, 0x9C, 0x1C, 0xEC, 0x6C, 0xAC, 0x2C, 0xCC, 0x4C, 0x8C, 0x0C, 53 0xF4, 0x74, 0xB4, 0x34, 0xD4, 0x54, 0x94, 0x14, 0xE4, 0x64, 0xA4, 0x24, 0xC4, 0x44, 0x84, 0x04, 54 0xF8, 0x78, 0xB8, 0x38, 0xD8, 0x58, 0x98, 0x18, 0xE8, 0x68, 0xA8, 0x28, 0xC8, 0x48, 0x88, 0x08, 55 0xF0, 0x70, 0xB0, 0x30, 0xD0, 0x50, 0x90, 0x10, 0xE0, 0x60, 0xA0, 0x20, 0xC0, 0x40, 0x80, 0x00, 56}; 57 58typedef struct { 59 int y, pl, x, vdup; 60} State; 61 62static void put_lines_bits(AVCodecContext *avctx, int planes, int row_width, int pixel_size, State * state, uint8_t * row, AVFrame *p) 63{ 64 int pl_byte = state->pl / 8; 65 int pl_bit = state->pl & 7; 66 for (int y = 0; y < state->vdup && (state->y + y) < avctx->height; y++) 67 for (int x = 0; x < row_width; x++) 68 for (int i = 7; i >= 0 && x * 8 + 7 - i < avctx->width; i--) 69 p->data[0][ (state->y + y) * p->linesize[0] + (x * 8 + 7 - i) * pixel_size + pl_byte] |= !!(row[x] & (1 << i)) << pl_bit; 70 71 state->pl++; 72 if (state->pl >= planes) { 73 state->pl = 0; 74 state->y += state->vdup; 75 state->vdup = 1; 76 } 77} 78 79static void put_lines_bytes(AVCodecContext *avctx, int planes, int row_width, int pixel_size, State * state, uint8_t * row, AVFrame *p) 80{ 81 for (int y = 0; y < state->vdup && (state->y + y) < avctx->height; y++) 82 memcpy(p->data[0] + (state->y + y) * p->linesize[0], row, avctx->width * pixel_size); 83 84 state->y += state->vdup; 85 state->vdup = 1; 86} 87 88static int gem_decode_frame(AVCodecContext *avctx, AVFrame *p, 89 int *got_frame, AVPacket *avpkt) 90{ 91 const uint8_t *buf = avpkt->data; 92 int buf_size = avpkt->size; 93 const uint8_t *buf_end = buf + buf_size; 94 int header_size, planes, pattern_size, tag = 0, count_scalar = 1, ret; 95 unsigned int x, count, v; 96 GetByteContext gb; 97 uint32_t *palette; 98 const uint8_t * b; 99 uint8_t * row; 100 int row_width, pixel_size; 101 State state = {.y = 0, .pl = 0, .x = 0, .vdup = 1}; 102 void (*put_lines)(AVCodecContext *avctx, int planes, int row_width, int pixel_size, State * state, uint8_t * row, AVFrame *p); 103 int width, height; 104 105 if (buf_size <= 16) 106 return AVERROR_INVALIDDATA; 107 108 bytestream2_init(&gb, buf + 2, buf_size - 2); 109 header_size = bytestream2_get_be16(&gb); 110 if (header_size < 8 || buf_size <= header_size * 2) 111 return AVERROR_INVALIDDATA; 112 113 planes = bytestream2_get_be16(&gb); 114 pattern_size = bytestream2_get_be16(&gb); 115 avctx->sample_aspect_ratio.num = bytestream2_get_be16(&gb); 116 avctx->sample_aspect_ratio.den = bytestream2_get_be16(&gb); 117 width = bytestream2_get_be16(&gb); 118 height = bytestream2_get_be16(&gb); 119 ret = ff_set_dimensions(avctx, width, height); 120 if (ret < 0) 121 return ret; 122 123 row_width = (avctx->width + 7) / 8; 124 put_lines = put_lines_bits; 125 126 if (header_size == 9) { 127 count_scalar = bytestream2_get_be16(&gb); 128 if (count_scalar != 3) { 129 avpriv_request_sample(avctx, "count_scalar=%d", count_scalar); 130 return AVERROR_PATCHWELCOME; 131 } 132 planes = 24; 133 avctx->pix_fmt = AV_PIX_FMT_BGR24; 134 pixel_size = 3; 135 } else if (planes == 15) { 136#if HAVE_BIGENDIAN 137 avctx->pix_fmt = AV_PIX_FMT_BGR555BE; 138#else 139 avctx->pix_fmt = AV_PIX_FMT_BGR555LE; 140#endif 141 pixel_size = 2; 142 } else if (planes == 16) { 143 avctx->pix_fmt = AV_PIX_FMT_RGB565BE; 144 pixel_size = 2; 145 } else if (planes == 24) { 146 avctx->pix_fmt = AV_PIX_FMT_RGB24; 147 pixel_size = 3; 148 } else if (planes == 32) { 149 avctx->pix_fmt = AV_PIX_FMT_0RGB; 150 pixel_size = 4; 151 } else { 152 avctx->pix_fmt = AV_PIX_FMT_PAL8; 153 pixel_size = 1; 154 } 155 156 if (header_size >= 11) 157 tag = bytestream2_peek_be32(&gb); 158 159 if (tag == AV_RB32("STTT")) { 160 if (planes != 4) { 161 avpriv_request_sample(avctx, "STTT planes=%d", planes); 162 return AVERROR_PATCHWELCOME; 163 } 164 } else if (tag == AV_RB32("TIMG")) { 165 if (planes != 15) { 166 avpriv_request_sample(avctx, "TIMG planes=%d", planes); 167 return AVERROR_PATCHWELCOME; 168 } 169 } else if (tag == AV_RB32("XIMG")) { 170 if (planes != 1 && planes != 2 && planes != 4 && planes != 8 && planes != 16 && planes != 24 && planes != 32) { 171 avpriv_request_sample(avctx, "XIMG planes=%d", planes); 172 return AVERROR_PATCHWELCOME; 173 } 174 } else if (planes != 1 && planes != 2 && planes != 3 && planes != 4 && planes != 8 && planes != 16 && planes != 24) { 175 avpriv_request_sample(avctx, "planes=%d", planes); 176 return AVERROR_PATCHWELCOME; 177 } 178 179 if ((ret = ff_get_buffer(avctx, p, 0)) < 0) 180 return ret; 181 182 p->pict_type = AV_PICTURE_TYPE_I; 183 p->key_frame = 1; 184 p->palette_has_changed = 1; 185 palette = (uint32_t *)p->data[1]; 186 187 if (tag == AV_RB32("STTT")) { 188 bytestream2_skip(&gb, 6); 189 if (planes == 4) { 190 for (int i = 0; i < (1 << planes); i++) { 191 int v = bytestream2_get_be16(&gb); 192 int r = ((v >> 8) & 0x7) << 5; 193 int g = ((v >> 4) & 0x7) << 5; 194 int b = ((v ) & 0x7) << 5; 195 palette[i] = 0xFF000000 | r << 16 | g << 8 | b; 196 } 197 } else { 198 av_assert0(0); 199 } 200 } else if (tag == AV_RB32("TIMG")) { 201 bytestream2_skip(&gb, 4); 202 if (planes != 15) { 203 av_assert0(0); 204 } 205 } else if (tag == AV_RB32("XIMG")) { 206 bytestream2_skip(&gb, 6); 207 if (planes == 1 || planes == 2 || planes == 4 || planes == 8) { 208 for (int i = 0; i < (1 << planes); i++) { 209 int r = (bytestream2_get_be16(&gb) * 51 + 100) / 200; 210 int g = (bytestream2_get_be16(&gb) * 51 + 100) / 200; 211 int b = (bytestream2_get_be16(&gb) * 51 + 100) / 200; 212 palette[i] = 0xFF000000 | r << 16 | g << 8 | b; 213 } 214 } else if (planes == 16) { 215 planes = 1; 216 row_width = ((avctx->width + 7)/8)*8 * pixel_size; 217 put_lines = put_lines_bytes; 218 } else if (planes == 24) { 219 planes = 1; 220 row_width = ((avctx->width + 15)/16)*16 * pixel_size; 221 put_lines = put_lines_bytes; 222 } else if (planes == 32) { 223 planes = 1; 224 row_width = avctx->width * pixel_size; 225 put_lines = put_lines_bytes; 226 } else { 227 av_assert0(0); 228 } 229 } else if (planes == 1) { 230 palette[0] = 0xFFFFFFFF; 231 palette[1] = 0xFF000000; 232 } else if (planes == 2 || planes == 3 || planes == 4) { 233 if (header_size == 9 + (1 << planes)) { 234 bytestream2_skip(&gb, 2); 235 for (int i = 0; i < (1 << planes); i++) { 236 int v = bytestream2_get_be16(&gb); 237 int r = ((v >> 8) & 0x7) << 5; 238 int g = ((v >> 4) & 0x7) << 5; 239 int b = ((v ) & 0x7) << 5; 240 palette[i] = 0xFF000000 | r << 16 | g << 8 | b; 241 } 242 } else 243 memcpy(palette, gem_color_palette, sizeof(gem_color_palette)); 244 } else if (planes == 8) { 245 for (int i = 0; i < 256; i++) 246 palette[i] = 0xFF000000 | (gem_gray[i]<<16) | (gem_gray[i]<<8) | gem_gray[i]; 247 } else if (planes == 16) { 248 planes = 1; 249 row_width = avctx->width * pixel_size; 250 put_lines = put_lines_bytes; 251 } else if (planes == 24) { 252 planes = 1; 253 row_width = avctx->width * pixel_size; 254 put_lines = put_lines_bytes; 255 } else 256 av_assert0(0); 257 258 ret = av_reallocp_array(&avctx->priv_data, planes, row_width); 259 if (ret < 0) 260 return ret; 261 row = avctx->priv_data; 262 263 memset(p->data[0], 0, avctx->height * p->linesize[0]); 264 b = buf + header_size * 2; 265 x = 0; 266 267#define SKIP \ 268do { \ 269 x++; \ 270 if (x >= row_width) { \ 271 put_lines(avctx, planes, row_width, pixel_size, &state, row + state.pl * row_width, p); \ 272 if (state.y >= avctx->height) goto abort; \ 273 x = 0; \ 274 } \ 275} while(0) 276 277#define PUT(v) \ 278do { \ 279 row[state.pl * row_width + x++] = v; \ 280 if (x >= row_width) { \ 281 put_lines(avctx, planes, row_width, pixel_size, &state, row + state.pl * row_width, p); \ 282 if (state.y >= avctx->height) goto abort; \ 283 x = 0; \ 284 } \ 285} while(0) 286 287 while(b < buf_end) { 288 int opcode = *b++; 289 if (opcode == 0x80) { /* copy */ 290 if (b >= buf_end) 291 goto abort; 292 count = *b++; 293 if (!count) 294 count = 256; 295 count *= count_scalar; 296 for (int j = 0; j < count; j++) { 297 if (b >= buf_end) 298 goto abort; 299 PUT(*b++); 300 } 301 } else if (opcode) { /* run */ 302 count = opcode & 0x7f; 303 if (!count) 304 count = 256; 305 count *= count_scalar; 306 v = opcode & 0x80 ? 0xFF : 0x00; 307 for (int i = 0; i < count; i++) 308 PUT(v); 309 } else { 310 if (b >= buf_end) 311 goto abort; 312 count = *b++; 313 if (count) { /* pattern */ 314 if (b > buf_end - pattern_size) 315 goto abort; 316 317 count *= count_scalar; 318 for (int j = 0; j < count; j++) 319 for (int k = 0; k < pattern_size; k++) 320 PUT(b[k]); 321 322 b += pattern_size; 323 } else { 324 if (b >= buf_end) 325 goto abort; 326 count = *b++; 327 if (count == 0xFF) { /* vertical duplication */ 328 if (b >= buf_end) 329 goto abort; 330 state.vdup = *b++; 331 if (!state.vdup) 332 state.vdup = 256; 333 } else { /* horizontal duplication */ 334 for (int i = 0; i < count + 1; i++) 335 SKIP; 336 } 337 } 338 } 339 } 340 341abort: 342 343 *got_frame = 1; 344 return buf_size; 345} 346 347static av_cold int gem_close(AVCodecContext *avctx) 348{ 349 av_freep(&avctx->priv_data); 350 return 0; 351} 352 353const FFCodec ff_gem_decoder = { 354 .p.name = "gem", 355 .p.long_name = NULL_IF_CONFIG_SMALL("GEM Raster image"), 356 .p.type = AVMEDIA_TYPE_VIDEO, 357 .p.id = AV_CODEC_ID_GEM, 358 .p.capabilities = AV_CODEC_CAP_DR1, 359 FF_CODEC_DECODE_CB(gem_decode_frame), 360 .close = gem_close, 361}; 362