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