blob: 93e0ef7905db8306ad65c6d8270384e743668dba
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 | if (flags & TGA_RIGHTTOLEFT) { // right-to-left, needs horizontal flip |
270 | int x; |
271 | for (y = 0; y < h; y++) { |
272 | void *line = &p->data[0][y * p->linesize[0]]; |
273 | for (x = 0; x < w >> 1; x++) { |
274 | switch (bpp) { |
275 | case 32: |
276 | FFSWAP(uint32_t, ((uint32_t *)line)[x], ((uint32_t *)line)[w - x - 1]); |
277 | break; |
278 | case 24: |
279 | FFSWAP(uint8_t, ((uint8_t *)line)[3 * x ], ((uint8_t *)line)[3 * w - 3 * x - 3]); |
280 | FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 1], ((uint8_t *)line)[3 * w - 3 * x - 2]); |
281 | FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 2], ((uint8_t *)line)[3 * w - 3 * x - 1]); |
282 | break; |
283 | case 16: |
284 | FFSWAP(uint16_t, ((uint16_t *)line)[x], ((uint16_t *)line)[w - x - 1]); |
285 | break; |
286 | case 8: |
287 | FFSWAP(uint8_t, ((uint8_t *)line)[x], ((uint8_t *)line)[w - x - 1]); |
288 | } |
289 | } |
290 | } |
291 | } |
292 | } |
293 | |
294 | |
295 | *got_frame = 1; |
296 | |
297 | return avpkt->size; |
298 | } |
299 | |
300 | AVCodec ff_targa_decoder = { |
301 | .name = "targa", |
302 | .long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"), |
303 | .type = AVMEDIA_TYPE_VIDEO, |
304 | .id = AV_CODEC_ID_TARGA, |
305 | .priv_data_size = sizeof(TargaContext), |
306 | .decode = decode_frame, |
307 | .capabilities = AV_CODEC_CAP_DR1, |
308 | }; |
309 |