| 1 | /* |
| 2 | * Targa (.tga) image decoder |
| 3 | * Copyright (c) 2006 Konstantin Shishkov |
| 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 "libavutil/intreadwrite.h" |
| 23 | #include "libavutil/imgutils.h" |
| 24 | #include "avcodec.h" |
| 25 | #include "bytestream.h" |
| 26 | #include "internal.h" |
| 27 | #include "targa.h" |
| 28 | |
| 29 | typedef struct TargaContext { |
| 30 | GetByteContext gb; |
| 31 | } TargaContext; |
| 32 | |
| 33 | static uint8_t *advance_line(uint8_t *start, uint8_t *line, |
| 34 | int stride, int *y, int h, int interleave) |
| 35 | { |
| 36 | *y += interleave; |
| 37 | |
| 38 | if (*y < h) { |
| 39 | return line + interleave * stride; |
| 40 | } else { |
| 41 | *y = (*y + 1) & (interleave - 1); |
| 42 | if (*y && *y < h) { |
| 43 | return start + *y * stride; |
| 44 | } else { |
| 45 | return NULL; |
| 46 | } |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | static int targa_decode_rle(AVCodecContext *avctx, TargaContext *s, |
| 51 | uint8_t *start, int w, int h, int stride, |
| 52 | int bpp, int interleave) |
| 53 | { |
| 54 | int x, y; |
| 55 | int depth = (bpp + 1) >> 3; |
| 56 | int type, count; |
| 57 | uint8_t *line = start; |
| 58 | uint8_t *dst = line; |
| 59 | |
| 60 | x = y = count = 0; |
| 61 | while (dst) { |
| 62 | if (bytestream2_get_bytes_left(&s->gb) <= 0) { |
| 63 | av_log(avctx, AV_LOG_ERROR, |
| 64 | "Ran ouf of data before end-of-image\n"); |
| 65 | return AVERROR_INVALIDDATA; |
| 66 | } |
| 67 | type = bytestream2_get_byteu(&s->gb); |
| 68 | count = (type & 0x7F) + 1; |
| 69 | type &= 0x80; |
| 70 | if (!type) { |
| 71 | do { |
| 72 | int n = FFMIN(count, w - x); |
| 73 | bytestream2_get_buffer(&s->gb, dst, n * depth); |
| 74 | count -= n; |
| 75 | dst += n * depth; |
| 76 | x += n; |
| 77 | if (x == w) { |
| 78 | x = 0; |
| 79 | dst = line = advance_line(start, line, stride, &y, h, interleave); |
| 80 | } |
| 81 | } while (dst && count > 0); |
| 82 | } else { |
| 83 | uint8_t tmp[4]; |
| 84 | bytestream2_get_buffer(&s->gb, tmp, depth); |
| 85 | do { |
| 86 | int n = FFMIN(count, w - x); |
| 87 | count -= n; |
| 88 | x += n; |
| 89 | do { |
| 90 | memcpy(dst, tmp, depth); |
| 91 | dst += depth; |
| 92 | } while (--n); |
| 93 | if (x == w) { |
| 94 | x = 0; |
| 95 | dst = line = advance_line(start, line, stride, &y, h, interleave); |
| 96 | } |
| 97 | } while (dst && count > 0); |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | if (count) { |
| 102 | av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds\n"); |
| 103 | return AVERROR_INVALIDDATA; |
| 104 | } |
| 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | static int decode_frame(AVCodecContext *avctx, |
| 110 | void *data, int *got_frame, |
| 111 | AVPacket *avpkt) |
| 112 | { |
| 113 | TargaContext * const s = avctx->priv_data; |
| 114 | AVFrame * const p = data; |
| 115 | uint8_t *dst; |
| 116 | int stride; |
| 117 | int idlen, pal, compr, y, w, h, bpp, flags, ret; |
| 118 | int first_clr, colors, csize; |
| 119 | int interleave; |
| 120 | |
| 121 | bytestream2_init(&s->gb, avpkt->data, avpkt->size); |
| 122 | |
| 123 | /* parse image header */ |
| 124 | idlen = bytestream2_get_byte(&s->gb); |
| 125 | pal = bytestream2_get_byte(&s->gb); |
| 126 | compr = bytestream2_get_byte(&s->gb); |
| 127 | first_clr = bytestream2_get_le16(&s->gb); |
| 128 | colors = bytestream2_get_le16(&s->gb); |
| 129 | csize = bytestream2_get_byte(&s->gb); |
| 130 | bytestream2_skip(&s->gb, 4); /* 2: x, 2: y */ |
| 131 | w = bytestream2_get_le16(&s->gb); |
| 132 | h = bytestream2_get_le16(&s->gb); |
| 133 | bpp = bytestream2_get_byte(&s->gb); |
| 134 | |
| 135 | if (bytestream2_get_bytes_left(&s->gb) <= idlen) { |
| 136 | av_log(avctx, AV_LOG_ERROR, |
| 137 | "Not enough data to read header\n"); |
| 138 | return AVERROR_INVALIDDATA; |
| 139 | } |
| 140 | |
| 141 | flags = bytestream2_get_byte(&s->gb); |
| 142 | |
| 143 | if (!pal && (first_clr || colors || csize)) { |
| 144 | av_log(avctx, AV_LOG_WARNING, "File without colormap has colormap information set.\n"); |
| 145 | // specification says we should ignore those value in this case |
| 146 | first_clr = colors = csize = 0; |
| 147 | } |
| 148 | |
| 149 | // skip identifier if any |
| 150 | bytestream2_skip(&s->gb, idlen); |
| 151 | |
| 152 | switch (bpp) { |
| 153 | case 8: |
| 154 | avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? AV_PIX_FMT_GRAY8 : AV_PIX_FMT_PAL8; |
| 155 | break; |
| 156 | case 15: |
| 157 | case 16: |
| 158 | avctx->pix_fmt = AV_PIX_FMT_RGB555LE; |
| 159 | break; |
| 160 | case 24: |
| 161 | avctx->pix_fmt = AV_PIX_FMT_BGR24; |
| 162 | break; |
| 163 | case 32: |
| 164 | avctx->pix_fmt = AV_PIX_FMT_BGRA; |
| 165 | break; |
| 166 | default: |
| 167 | av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", bpp); |
| 168 | return AVERROR_INVALIDDATA; |
| 169 | } |
| 170 | |
| 171 | if (colors && (colors + first_clr) > 256) { |
| 172 | av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr); |
| 173 | return AVERROR_INVALIDDATA; |
| 174 | } |
| 175 | |
| 176 | if ((ret = ff_set_dimensions(avctx, w, h)) < 0) |
| 177 | return ret; |
| 178 | |
| 179 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
| 180 | return ret; |
| 181 | p->pict_type = AV_PICTURE_TYPE_I; |
| 182 | |
| 183 | if (flags & TGA_TOPTOBOTTOM) { |
| 184 | dst = p->data[0]; |
| 185 | stride = p->linesize[0]; |
| 186 | } else { //image is upside-down |
| 187 | dst = p->data[0] + p->linesize[0] * (h - 1); |
| 188 | stride = -p->linesize[0]; |
| 189 | } |
| 190 | |
| 191 | interleave = flags & TGA_INTERLEAVE2 ? 2 : |
| 192 | flags & TGA_INTERLEAVE4 ? 4 : 1; |
| 193 | |
| 194 | if (colors) { |
| 195 | int pal_size, pal_sample_size; |
| 196 | |
| 197 | switch (csize) { |
| 198 | case 32: pal_sample_size = 4; break; |
| 199 | case 24: pal_sample_size = 3; break; |
| 200 | case 16: |
| 201 | case 15: pal_sample_size = 2; break; |
| 202 | default: |
| 203 | av_log(avctx, AV_LOG_ERROR, "Palette entry size %i bits is not supported\n", csize); |
| 204 | return AVERROR_INVALIDDATA; |
| 205 | } |
| 206 | pal_size = colors * pal_sample_size; |
| 207 | if (avctx->pix_fmt != AV_PIX_FMT_PAL8) //should not occur but skip palette anyway |
| 208 | bytestream2_skip(&s->gb, pal_size); |
| 209 | else { |
| 210 | int t; |
| 211 | uint32_t *pal = ((uint32_t *)p->data[1]) + first_clr; |
| 212 | |
| 213 | if (bytestream2_get_bytes_left(&s->gb) < pal_size) { |
| 214 | av_log(avctx, AV_LOG_ERROR, |
| 215 | "Not enough data to read palette\n"); |
| 216 | return AVERROR_INVALIDDATA; |
| 217 | } |
| 218 | switch (pal_sample_size) { |
| 219 | case 4: |
| 220 | for (t = 0; t < colors; t++) |
| 221 | *pal++ = bytestream2_get_le32u(&s->gb); |
| 222 | break; |
| 223 | case 3: |
| 224 | /* RGB24 */ |
| 225 | for (t = 0; t < colors; t++) |
| 226 | *pal++ = (0xffU<<24) | bytestream2_get_le24u(&s->gb); |
| 227 | break; |
| 228 | case 2: |
| 229 | /* RGB555 */ |
| 230 | for (t = 0; t < colors; t++) { |
| 231 | uint32_t v = bytestream2_get_le16u(&s->gb); |
| 232 | v = ((v & 0x7C00) << 9) | |
| 233 | ((v & 0x03E0) << 6) | |
| 234 | ((v & 0x001F) << 3); |
| 235 | /* left bit replication */ |
| 236 | v |= (v & 0xE0E0E0U) >> 5; |
| 237 | *pal++ = (0xffU<<24) | v; |
| 238 | } |
| 239 | break; |
| 240 | } |
| 241 | p->palette_has_changed = 1; |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | if ((compr & (~TGA_RLE)) == TGA_NODATA) { |
| 246 | memset(p->data[0], 0, p->linesize[0] * h); |
| 247 | } else { |
| 248 | if (compr & TGA_RLE) { |
| 249 | int res = targa_decode_rle(avctx, s, dst, w, h, stride, bpp, interleave); |
| 250 | if (res < 0) |
| 251 | return res; |
| 252 | } else { |
| 253 | size_t img_size = w * ((bpp + 1) >> 3); |
| 254 | uint8_t *line; |
| 255 | if (bytestream2_get_bytes_left(&s->gb) < img_size * h) { |
| 256 | av_log(avctx, AV_LOG_ERROR, |
| 257 | "Not enough data available for image\n"); |
| 258 | return AVERROR_INVALIDDATA; |
| 259 | } |
| 260 | |
| 261 | line = dst; |
| 262 | y = 0; |
| 263 | do { |
| 264 | bytestream2_get_buffer(&s->gb, line, img_size); |
| 265 | line = advance_line(dst, line, stride, &y, h, interleave); |
| 266 | } while (line); |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | if (flags & TGA_RIGHTTOLEFT) { // right-to-left, needs horizontal flip |
| 271 | int x; |
| 272 | for (y = 0; y < h; y++) { |
| 273 | void *line = &p->data[0][y * p->linesize[0]]; |
| 274 | for (x = 0; x < w >> 1; x++) { |
| 275 | switch (bpp) { |
| 276 | case 32: |
| 277 | FFSWAP(uint32_t, ((uint32_t *)line)[x], ((uint32_t *)line)[w - x - 1]); |
| 278 | break; |
| 279 | case 24: |
| 280 | FFSWAP(uint8_t, ((uint8_t *)line)[3 * x ], ((uint8_t *)line)[3 * w - 3 * x - 3]); |
| 281 | FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 1], ((uint8_t *)line)[3 * w - 3 * x - 2]); |
| 282 | FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 2], ((uint8_t *)line)[3 * w - 3 * x - 1]); |
| 283 | break; |
| 284 | case 16: |
| 285 | FFSWAP(uint16_t, ((uint16_t *)line)[x], ((uint16_t *)line)[w - x - 1]); |
| 286 | break; |
| 287 | case 8: |
| 288 | FFSWAP(uint8_t, ((uint8_t *)line)[x], ((uint8_t *)line)[w - x - 1]); |
| 289 | } |
| 290 | } |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | *got_frame = 1; |
| 295 | |
| 296 | return avpkt->size; |
| 297 | } |
| 298 | |
| 299 | AVCodec ff_targa_decoder = { |
| 300 | .name = "targa", |
| 301 | .long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"), |
| 302 | .type = AVMEDIA_TYPE_VIDEO, |
| 303 | .id = AV_CODEC_ID_TARGA, |
| 304 | .priv_data_size = sizeof(TargaContext), |
| 305 | .decode = decode_frame, |
| 306 | .capabilities = CODEC_CAP_DR1, |
| 307 | }; |