FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/pcx.c
Date: 2024-04-20 14:10:07
Exec Total Coverage
Lines: 62 136 45.6%
Functions: 2 3 66.7%
Branches: 33 99 33.3%

Line Branch Exec Source
1 /*
2 * PC Paintbrush PCX (.pcx) image decoder
3 * Copyright (c) 2007, 2008 Ivo van Poorten
4 *
5 * This decoder does not support CGA palettes. I am unable to find samples
6 * and Netpbm cannot generate them.
7 *
8 * This file is part of FFmpeg.
9 *
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 #include "libavutil/mem.h"
26 #include "avcodec.h"
27 #include "bytestream.h"
28 #include "codec_internal.h"
29 #include "decode.h"
30 #include "get_bits.h"
31
32 #define PCX_HEADER_SIZE 128
33
34 4320 static int pcx_rle_decode(GetByteContext *gb,
35 uint8_t *dst,
36 unsigned int bytes_per_scanline,
37 int compressed)
38 {
39 4320 unsigned int i = 0;
40 unsigned char run, value;
41
42
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4320 if (bytestream2_get_bytes_left(gb) < 1)
43 return AVERROR_INVALIDDATA;
44
45
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4320 if (compressed) {
46
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4330025 while (i < bytes_per_scanline && bytestream2_get_bytes_left(gb)>0) {
47 4325705 run = 1;
48 4325705 value = bytestream2_get_byte(gb);
49
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4325705 if (value >= 0xc0 && bytestream2_get_bytes_left(gb)>0) {
50 1136991 run = value & 0x3f;
51 1136991 value = bytestream2_get_byte(gb);
52 }
53
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8887625 while (i < bytes_per_scanline && run--)
54 4561920 dst[i++] = value;
55 }
56 } else {
57 bytestream2_get_buffer(gb, dst, bytes_per_scanline);
58 }
59 4320 return 0;
60 }
61
62 static void pcx_palette(GetByteContext *gb, uint32_t *dst, int pallen)
63 {
64 int i;
65
66 pallen = FFMIN(pallen, bytestream2_get_bytes_left(gb) / 3);
67 for (i = 0; i < pallen; i++)
68 *dst++ = 0xFF000000 | bytestream2_get_be24u(gb);
69 if (pallen < 256)
70 memset(dst, 0, (256 - pallen) * sizeof(*dst));
71 }
72
73 15 static int pcx_decode_frame(AVCodecContext *avctx, AVFrame *p,
74 int *got_frame, AVPacket *avpkt)
75 {
76 GetByteContext gb;
77 int compressed, xmin, ymin, xmax, ymax;
78 int ret;
79 unsigned int w, h, bits_per_pixel, bytes_per_line, nplanes, y, x,
80 bytes_per_scanline;
81 uint8_t *ptr, *scanline;
82 ptrdiff_t stride;
83
84
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15 if (avpkt->size < PCX_HEADER_SIZE) {
85 av_log(avctx, AV_LOG_ERROR, "Packet too small\n");
86 return AVERROR_INVALIDDATA;
87 }
88
89 15 bytestream2_init(&gb, avpkt->data, avpkt->size);
90
91
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15 if (bytestream2_get_byteu(&gb) != 0x0a || bytestream2_get_byteu(&gb) > 5) {
92 av_log(avctx, AV_LOG_ERROR, "this is not PCX encoded data\n");
93 return AVERROR_INVALIDDATA;
94 }
95
96 15 compressed = bytestream2_get_byteu(&gb);
97 15 bits_per_pixel = bytestream2_get_byteu(&gb);
98 15 xmin = bytestream2_get_le16u(&gb);
99 15 ymin = bytestream2_get_le16u(&gb);
100 15 xmax = bytestream2_get_le16u(&gb);
101 15 ymax = bytestream2_get_le16u(&gb);
102 15 avctx->sample_aspect_ratio.num = bytestream2_get_le16u(&gb);
103 15 avctx->sample_aspect_ratio.den = bytestream2_get_le16u(&gb);
104
105
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15 if (xmax < xmin || ymax < ymin) {
106 av_log(avctx, AV_LOG_ERROR, "invalid image dimensions\n");
107 return AVERROR_INVALIDDATA;
108 }
109
110 15 w = xmax - xmin + 1;
111 15 h = ymax - ymin + 1;
112
113 15 bytestream2_skipu(&gb, 49);
114 15 nplanes = bytestream2_get_byteu(&gb);
115 15 bytes_per_line = bytestream2_get_le16u(&gb);
116 15 bytes_per_scanline = nplanes * bytes_per_line;
117
118
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15 if (bytes_per_scanline < (w * bits_per_pixel * nplanes + 7) / 8 ||
119 (!compressed && bytes_per_scanline > bytestream2_get_bytes_left(&gb) / h)) {
120 av_log(avctx, AV_LOG_ERROR, "PCX data is corrupted\n");
121 return AVERROR_INVALIDDATA;
122 }
123
124
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15 switch ((nplanes << 8) + bits_per_pixel) {
125 15 case 0x0308:
126 15 avctx->pix_fmt = AV_PIX_FMT_RGB24;
127 15 break;
128 case 0x0108:
129 case 0x0104:
130 case 0x0102:
131 case 0x0101:
132 case 0x0401:
133 case 0x0301:
134 case 0x0201:
135 avctx->pix_fmt = AV_PIX_FMT_PAL8;
136 break;
137 default:
138 av_log(avctx, AV_LOG_ERROR, "invalid PCX file\n");
139 return AVERROR_INVALIDDATA;
140 }
141
142 15 bytestream2_skipu(&gb, 60);
143
144
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15 if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
145 return ret;
146
147
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15 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
148 return ret;
149
150 15 p->pict_type = AV_PICTURE_TYPE_I;
151
152 15 ptr = p->data[0];
153 15 stride = p->linesize[0];
154
155 15 scanline = av_malloc(bytes_per_scanline + AV_INPUT_BUFFER_PADDING_SIZE);
156
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15 if (!scanline)
157 return AVERROR(ENOMEM);
158
159
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15 if (nplanes == 3 && bits_per_pixel == 8) {
160
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4335 for (y = 0; y < h; y++) {
161 4320 ret = pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
162
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4320 if (ret < 0)
163 goto end;
164
165
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1524960 for (x = 0; x < w; x++) {
166 1520640 ptr[3 * x] = scanline[x];
167 1520640 ptr[3 * x + 1] = scanline[x + bytes_per_line];
168 1520640 ptr[3 * x + 2] = scanline[x + (bytes_per_line << 1)];
169 }
170
171 4320 ptr += stride;
172 }
173 } else if (nplanes == 1 && bits_per_pixel == 8) {
174 int palstart = avpkt->size - 769;
175
176 if (avpkt->size < 769) {
177 av_log(avctx, AV_LOG_ERROR, "File is too short\n");
178 ret = avctx->err_recognition & AV_EF_EXPLODE ?
179 AVERROR_INVALIDDATA : avpkt->size;
180 goto end;
181 }
182
183 for (y = 0; y < h; y++, ptr += stride) {
184 ret = pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
185 if (ret < 0)
186 goto end;
187 memcpy(ptr, scanline, w);
188 }
189
190 if (bytestream2_tell(&gb) != palstart) {
191 av_log(avctx, AV_LOG_WARNING, "image data possibly corrupted\n");
192 bytestream2_seek(&gb, palstart, SEEK_SET);
193 }
194 if (bytestream2_get_byte(&gb) != 12) {
195 av_log(avctx, AV_LOG_ERROR, "expected palette after image data\n");
196 ret = avctx->err_recognition & AV_EF_EXPLODE ?
197 AVERROR_INVALIDDATA : avpkt->size;
198 goto end;
199 }
200 } else if (nplanes == 1) { /* all packed formats, max. 16 colors */
201 GetBitContext s;
202
203 for (y = 0; y < h; y++) {
204 init_get_bits8(&s, scanline, bytes_per_scanline);
205
206 ret = pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
207 if (ret < 0)
208 goto end;
209
210 for (x = 0; x < w; x++)
211 ptr[x] = get_bits(&s, bits_per_pixel);
212 ptr += stride;
213 }
214 } else { /* planar, 4, 8 or 16 colors */
215 int i;
216
217 for (y = 0; y < h; y++) {
218 ret = pcx_rle_decode(&gb, scanline, bytes_per_scanline, compressed);
219 if (ret < 0)
220 goto end;
221
222 for (x = 0; x < w; x++) {
223 int m = 0x80 >> (x & 7), v = 0;
224 for (i = nplanes - 1; i >= 0; i--) {
225 v <<= 1;
226 v += !!(scanline[i * bytes_per_line + (x >> 3)] & m);
227 }
228 ptr[x] = v;
229 }
230 ptr += stride;
231 }
232 }
233
234 15 ret = bytestream2_tell(&gb);
235
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15 if (nplanes == 1 && bits_per_pixel == 8) {
236 pcx_palette(&gb, (uint32_t *)p->data[1], 256);
237 ret += 256 * 3;
238
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15 } else if (bits_per_pixel * nplanes == 1) {
239 AV_WN32A(p->data[1] , 0xFF000000);
240 AV_WN32A(p->data[1]+4, 0xFFFFFFFF);
241
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15 } else if (bits_per_pixel < 8) {
242 bytestream2_seek(&gb, 16, SEEK_SET);
243 pcx_palette(&gb, (uint32_t *)p->data[1], 16);
244 }
245
246 15 *got_frame = 1;
247
248 15 end:
249 15 av_free(scanline);
250 15 return ret;
251 }
252
253 const FFCodec ff_pcx_decoder = {
254 .p.name = "pcx",
255 CODEC_LONG_NAME("PC Paintbrush PCX image"),
256 .p.type = AVMEDIA_TYPE_VIDEO,
257 .p.id = AV_CODEC_ID_PCX,
258 FF_CODEC_DECODE_CB(pcx_decode_frame),
259 .p.capabilities = AV_CODEC_CAP_DR1,
260 };
261