FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/targa.c
Date: 2026-09-30 23:40:17
Exec Total Coverage
Lines: 116 175 66.3%
Functions: 3 3 100.0%
Branches: 63 108 58.3%
Line Branch Exec Source
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 "avcodec.h"
23 #include "bytestream.h"
24 #include "codec_internal.h"
25 #include "decode.h"
26 #include "targa.h"
27
28 typedef struct TargaContext {
29 GetByteContext gb;
30 } TargaContext;
31
32 7392 static uint8_t *advance_line(uint8_t *start, uint8_t *line,
33 int stride, int *y, int h, int interleave)
34 {
35 7392 *y += interleave;
36
37
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 7392 if (*y < h) {
38 7355 return line + interleave * stride;
39 } else {
40 37 *y = (*y + 1) & (interleave - 1);
41
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 37 if (*y && *y < h) {
42 ✗ return start + *y * stride;
43 } else {
44 37 return NULL;
45 }
46 }
47 }
48
49 12 static int targa_decode_rle(AVCodecContext *avctx, TargaContext *s,
50 uint8_t *start, int w, int h, int stride,
51 int bpp, int interleave)
52 {
53 int x, y;
54 12 int depth = (bpp + 1) >> 3;
55 int type, count;
56 12 uint8_t *line = start;
57 12 uint8_t *dst = line;
58
59 12 x = y = count = 0;
60
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 22056 while (dst) {
61
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 22044 if (bytestream2_get_bytes_left(&s->gb) <= 0) {
62 ✗ av_log(avctx, AV_LOG_ERROR,
63 "Ran ouf of data before end-of-image\n");
64 ✗ return AVERROR_INVALIDDATA;
65 }
66 22044 type = bytestream2_get_byteu(&s->gb);
67 22044 count = (type & 0x7F) + 1;
68 22044 type &= 0x80;
69
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 22044 if (!type) {
70 do {
71 1284 int n = FFMIN(count, w - x);
72
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 1284 if (bytestream2_get_bytes_left(&s->gb) < n * depth) {
73 ✗ av_log(avctx, AV_LOG_ERROR,
74 "Not enough data for raw RLE packet\n");
75 ✗ return AVERROR_INVALIDDATA;
76 }
77 1284 bytestream2_get_bufferu(&s->gb, dst, n * depth);
78 1284 count -= n;
79 1284 dst += n * depth;
80 1284 x += n;
81
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 1284 if (x == w) {
82 512 x = 0;
83 512 dst = line = advance_line(start, line, stride, &y, h, interleave);
84 }
85
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 1284 } while (dst && count > 0);
86 } else {
87 uint8_t tmp[4];
88
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 20760 if (bytestream2_get_buffer(&s->gb, tmp, depth) != depth) {
89 ✗ av_log(avctx, AV_LOG_ERROR,
90 "Not enough data for RLE pixel\n");
91 ✗ return AVERROR_INVALIDDATA;
92 }
93 do {
94 20760 int n = FFMIN(count, w - x);
95 20760 count -= n;
96 20760 x += n;
97 do {
98 164400 memcpy(dst, tmp, depth);
99 164400 dst += depth;
100
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 164400 } while (--n);
101
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 20760 if (x == w) {
102 1280 x = 0;
103 1280 dst = line = advance_line(start, line, stride, &y, h, interleave);
104 }
105
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 20760 } while (dst && count > 0);
106 }
107 }
108
109
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 12 if (count) {
110 ✗ av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds\n");
111 ✗ return AVERROR_INVALIDDATA;
112 }
113
114 12 return 0;
115 }
116
117 37 static int decode_frame(AVCodecContext *avctx, AVFrame *p,
118 int *got_frame, AVPacket *avpkt)
119 {
120 37 TargaContext * const s = avctx->priv_data;
121 uint8_t *dst;
122 int stride;
123 int idlen, pal, compr, y, w, h, bpp, flags, ret;
124 int first_clr, colors, csize;
125 int interleave;
126 size_t img_size;
127
128 37 bytestream2_init(&s->gb, avpkt->data, avpkt->size);
129
130 /* parse image header */
131 37 idlen = bytestream2_get_byte(&s->gb);
132 37 pal = bytestream2_get_byte(&s->gb);
133 37 compr = bytestream2_get_byte(&s->gb);
134 37 first_clr = bytestream2_get_le16(&s->gb);
135 37 colors = bytestream2_get_le16(&s->gb);
136 37 csize = bytestream2_get_byte(&s->gb);
137 37 bytestream2_skip(&s->gb, 4); /* 2: x, 2: y */
138 37 w = bytestream2_get_le16(&s->gb);
139 37 h = bytestream2_get_le16(&s->gb);
140 37 bpp = bytestream2_get_byte(&s->gb);
141
142 37 flags = bytestream2_get_byte(&s->gb);
143
144
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 37 if (!pal && (first_clr || colors || csize)) {
145 ✗ av_log(avctx, AV_LOG_WARNING, "File without colormap has colormap information set.\n");
146 // specification says we should ignore those value in this case
147 ✗ first_clr = colors = csize = 0;
148 }
149
150
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 37 if (bytestream2_get_bytes_left(&s->gb) < idlen + 2*colors) {
151 ✗ av_log(avctx, AV_LOG_ERROR,
152 "Not enough data to read header\n");
153 ✗ return AVERROR_INVALIDDATA;
154 }
155
156 // skip identifier if any
157 37 bytestream2_skip(&s->gb, idlen);
158
159
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 37 switch (bpp) {
160 8 case 8:
161
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 8 avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? AV_PIX_FMT_GRAY8 : AV_PIX_FMT_PAL8;
162 8 break;
163 4 case 15:
164 case 16:
165 4 avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
166 4 break;
167 21 case 24:
168 21 avctx->pix_fmt = AV_PIX_FMT_BGR24;
169 21 break;
170 4 case 32:
171 4 avctx->pix_fmt = AV_PIX_FMT_BGRA;
172 4 break;
173 ✗ default:
174 ✗ av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", bpp);
175 ✗ return AVERROR_INVALIDDATA;
176 }
177
178
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 37 if (colors && (colors + first_clr) > 256) {
179 ✗ av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr);
180 ✗ return AVERROR_INVALIDDATA;
181 }
182
183
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 37 if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
184 ✗ return ret;
185
186
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 37 if ((compr & (~TGA_RLE)) == TGA_NODATA) {
187 ✗ return avpkt->size;
188 }
189
190
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 37 if (!(compr & TGA_RLE)) {
191 25 img_size = w * ((bpp + 1) >> 3);
192
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 25 if (bytestream2_get_bytes_left(&s->gb) < img_size * h) {
193 ✗ av_log(avctx, AV_LOG_ERROR,
194 "Not enough data available for image\n");
195 ✗ return AVERROR_INVALIDDATA;
196 }
197 }
198
199
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 37 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
200 ✗ return ret;
201 37 p->pict_type = AV_PICTURE_TYPE_I;
202
203
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 37 if (flags & TGA_TOPTOBOTTOM) {
204 17 dst = p->data[0];
205 17 stride = p->linesize[0];
206 } else { //image is upside-down
207 20 dst = p->data[0] + p->linesize[0] * (h - 1);
208 20 stride = -p->linesize[0];
209 }
210
211
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 74 interleave = flags & TGA_INTERLEAVE2 ? 2 :
212
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 37 flags & TGA_INTERLEAVE4 ? 4 : 1;
213
214
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 37 if (colors) {
215 int pal_size, pal_sample_size;
216
217
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 4 switch (csize) {
218 ✗ case 32: pal_sample_size = 4; break;
219 ✗ case 24: pal_sample_size = 3; break;
220 4 case 16:
221 4 case 15: pal_sample_size = 2; break;
222 ✗ default:
223 ✗ av_log(avctx, AV_LOG_ERROR, "Palette entry size %i bits is not supported\n", csize);
224 ✗ return AVERROR_INVALIDDATA;
225 }
226 4 pal_size = colors * pal_sample_size;
227
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 4 if (avctx->pix_fmt != AV_PIX_FMT_PAL8) //should not occur but skip palette anyway
228 ✗ bytestream2_skip(&s->gb, pal_size);
229 else {
230 int t;
231 4 uint32_t *pal = ((uint32_t *)p->data[1]) + first_clr;
232
233
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 4 if (bytestream2_get_bytes_left(&s->gb) < pal_size) {
234 ✗ av_log(avctx, AV_LOG_ERROR,
235 "Not enough data to read palette\n");
236 ✗ return AVERROR_INVALIDDATA;
237 }
238
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 4 switch (pal_sample_size) {
239 ✗ case 4:
240 ✗ for (t = 0; t < colors; t++)
241 ✗ *pal++ = bytestream2_get_le32u(&s->gb);
242 ✗ break;
243 ✗ case 3:
244 /* RGB24 */
245 ✗ for (t = 0; t < colors; t++)
246 ✗ *pal++ = (0xffU<<24) | bytestream2_get_le24u(&s->gb);
247 ✗ break;
248 4 case 2:
249 /* RGB555 */
250
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 1028 for (t = 0; t < colors; t++) {
251 1024 uint32_t v = bytestream2_get_le16u(&s->gb);
252 1024 v = ((v & 0x7C00) << 9) |
253 1024 ((v & 0x03E0) << 6) |
254 1024 ((v & 0x001F) << 3);
255 /* left bit replication */
256 1024 v |= (v & 0xE0E0E0U) >> 5;
257 1024 *pal++ = (0xffU<<24) | v;
258 }
259 4 break;
260 }
261 }
262 }
263
264
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 37 if (compr & TGA_RLE) {
265 12 int res = targa_decode_rle(avctx, s, dst, w, h, stride, bpp, interleave);
266
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 12 if (res < 0)
267 ✗ return res;
268 } else {
269 uint8_t *line;
270
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 25 if (bytestream2_get_bytes_left(&s->gb) < img_size * h) {
271 ✗ av_log(avctx, AV_LOG_ERROR,
272 "Not enough data available for image\n");
273 ✗ return AVERROR_INVALIDDATA;
274 }
275
276 25 line = dst;
277 25 y = 0;
278 do {
279 5600 bytestream2_get_buffer(&s->gb, line, img_size);
280 5600 line = advance_line(dst, line, stride, &y, h, interleave);
281
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 5600 } while (line);
282 }
283
284
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 37 if (flags & TGA_RIGHTTOLEFT) { // right-to-left, needs horizontal flip
285 ✗ for (int y = 0; y < h; y++) {
286 ✗ void *line = &p->data[0][y * p->linesize[0]];
287 ✗ for (int x = 0; x < w >> 1; x++) {
288 ✗ switch (bpp) {
289 ✗ case 32:
290 ✗ FFSWAP(uint32_t, ((uint32_t *)line)[x], ((uint32_t *)line)[w - x - 1]);
291 ✗ break;
292 ✗ case 24:
293 ✗ FFSWAP(uint8_t, ((uint8_t *)line)[3 * x ], ((uint8_t *)line)[3 * w - 3 * x - 3]);
294 ✗ FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 1], ((uint8_t *)line)[3 * w - 3 * x - 2]);
295 ✗ FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 2], ((uint8_t *)line)[3 * w - 3 * x - 1]);
296 ✗ break;
297 ✗ case 16:
298 ✗ FFSWAP(uint16_t, ((uint16_t *)line)[x], ((uint16_t *)line)[w - x - 1]);
299 ✗ break;
300 ✗ case 8:
301 ✗ FFSWAP(uint8_t, ((uint8_t *)line)[x], ((uint8_t *)line)[w - x - 1]);
302 }
303 }
304 }
305 }
306
307
308 37 *got_frame = 1;
309
310 37 return avpkt->size;
311 }
312
313 const FFCodec ff_targa_decoder = {
314 .p.name = "targa",
315 CODEC_LONG_NAME("Truevision Targa image"),
316 .p.type = AVMEDIA_TYPE_VIDEO,
317 .p.id = AV_CODEC_ID_TARGA,
318 .p.capabilities = AV_CODEC_CAP_DR1,
319 .priv_data_size = sizeof(TargaContext),
320 FF_CODEC_DECODE_CB(decode_frame),
321 };
322