FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/targa.c
Date: 2024-02-16 17:37:06
Exec Total Coverage
Lines: 116 171 67.8%
Functions: 3 3 100.0%
Branches: 61 104 58.7%

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