FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/bmp.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 158 218 72.5%
Branches: 115 186 61.8%

Line Branch Exec Source
1 /*
2 * BMP image format decoder
3 * Copyright (c) 2005 Mans Rullgard
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 <inttypes.h>
23
24 #include "avcodec.h"
25 #include "bytestream.h"
26 #include "bmp.h"
27 #include "internal.h"
28 #include "msrledec.h"
29
30 51 static int bmp_decode_frame(AVCodecContext *avctx,
31 void *data, int *got_frame,
32 AVPacket *avpkt)
33 {
34 51 const uint8_t *buf = avpkt->data;
35 51 int buf_size = avpkt->size;
36 51 AVFrame *p = data;
37 unsigned int fsize, hsize;
38 int width, height;
39 unsigned int depth;
40 BiCompression comp;
41 unsigned int ihsize;
42 int i, j, n, linesize, ret;
43 51 uint32_t rgb[3] = {0};
44 51 uint32_t alpha = 0;
45 uint8_t *ptr;
46 int dsize;
47 51 const uint8_t *buf0 = buf;
48 GetByteContext gb;
49
50
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51 if (buf_size < 14) {
51 av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size);
52 return AVERROR_INVALIDDATA;
53 }
54
55
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102 if (bytestream_get_byte(&buf) != 'B' ||
56 51 bytestream_get_byte(&buf) != 'M') {
57 av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
58 return AVERROR_INVALIDDATA;
59 }
60
61 51 fsize = bytestream_get_le32(&buf);
62
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51 if (buf_size < fsize) {
63 av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %u), trying to decode anyway\n",
64 buf_size, fsize);
65 fsize = buf_size;
66 }
67
68 51 buf += 2; /* reserved1 */
69 51 buf += 2; /* reserved2 */
70
71 51 hsize = bytestream_get_le32(&buf); /* header size */
72 51 ihsize = bytestream_get_le32(&buf); /* more header size */
73
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51 if (ihsize + 14LL > hsize) {
74 av_log(avctx, AV_LOG_ERROR, "invalid header size %u\n", hsize);
75 return AVERROR_INVALIDDATA;
76 }
77
78 /* sometimes file size is set to some headers size, set a real size in that case */
79
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51 if (fsize == 14 || fsize == ihsize + 14)
80 2 fsize = buf_size - 2;
81
82
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51 if (fsize <= hsize) {
83 av_log(avctx, AV_LOG_ERROR,
84 "Declared file size is less than header size (%u < %u)\n",
85 fsize, hsize);
86 return AVERROR_INVALIDDATA;
87 }
88
89
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51 switch (ihsize) {
90 49 case 40: // windib
91 case 56: // windib v3
92 case 64: // OS/2 v2
93 case 108: // windib v4
94 case 124: // windib v5
95 49 width = bytestream_get_le32(&buf);
96 49 height = bytestream_get_le32(&buf);
97 49 break;
98 2 case 12: // OS/2 v1
99 2 width = bytestream_get_le16(&buf);
100 2 height = bytestream_get_le16(&buf);
101 2 break;
102 default:
103 avpriv_report_missing_feature(avctx, "Information header size %u",
104 ihsize);
105 return AVERROR_PATCHWELCOME;
106 }
107
108 /* planes */
109
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51 if (bytestream_get_le16(&buf) != 1) {
110 av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n");
111 return AVERROR_INVALIDDATA;
112 }
113
114 51 depth = bytestream_get_le16(&buf);
115
116
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51 if (ihsize >= 40)
117 49 comp = bytestream_get_le32(&buf);
118 else
119 2 comp = BMP_RGB;
120
121
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51 if (comp != BMP_RGB && comp != BMP_BITFIELDS && comp != BMP_RLE4 &&
122 comp != BMP_RLE8) {
123 av_log(avctx, AV_LOG_ERROR, "BMP coding %d not supported\n", comp);
124 return AVERROR_INVALIDDATA;
125 }
126
127
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51 if (comp == BMP_BITFIELDS) {
128 7 buf += 20;
129 7 rgb[0] = bytestream_get_le32(&buf);
130 7 rgb[1] = bytestream_get_le32(&buf);
131 7 rgb[2] = bytestream_get_le32(&buf);
132
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7 if (ihsize > 40)
133 alpha = bytestream_get_le32(&buf);
134 }
135
136
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51 ret = ff_set_dimensions(avctx, width, height > 0 ? height : -(unsigned)height);
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51 if (ret < 0) {
138 av_log(avctx, AV_LOG_ERROR, "Failed to set dimensions %d %d\n", width, height);
139 return AVERROR_INVALIDDATA;
140 }
141
142 51 avctx->pix_fmt = AV_PIX_FMT_NONE;
143
144
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51 switch (depth) {
145 5 case 32:
146
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5 if (comp == BMP_BITFIELDS) {
147
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3 if (rgb[0] == 0xFF000000 && rgb[1] == 0x00FF0000 && rgb[2] == 0x0000FF00)
148 avctx->pix_fmt = alpha ? AV_PIX_FMT_ABGR : AV_PIX_FMT_0BGR;
149
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3 else if (rgb[0] == 0x00FF0000 && rgb[1] == 0x0000FF00 && rgb[2] == 0x000000FF)
150
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3 avctx->pix_fmt = alpha ? AV_PIX_FMT_BGRA : AV_PIX_FMT_BGR0;
151 else if (rgb[0] == 0x0000FF00 && rgb[1] == 0x00FF0000 && rgb[2] == 0xFF000000)
152 avctx->pix_fmt = alpha ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
153 else if (rgb[0] == 0x000000FF && rgb[1] == 0x0000FF00 && rgb[2] == 0x00FF0000)
154 avctx->pix_fmt = alpha ? AV_PIX_FMT_RGBA : AV_PIX_FMT_RGB0;
155 else {
156 av_log(avctx, AV_LOG_ERROR, "Unknown bitfields "
157 "%0"PRIX32" %0"PRIX32" %0"PRIX32"\n", rgb[0], rgb[1], rgb[2]);
158 return AVERROR(EINVAL);
159 }
160 } else {
161 2 avctx->pix_fmt = AV_PIX_FMT_BGRA;
162 }
163 5 break;
164 26 case 24:
165 26 avctx->pix_fmt = AV_PIX_FMT_BGR24;
166 26 break;
167 6 case 16:
168
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6 if (comp == BMP_RGB)
169 2 avctx->pix_fmt = AV_PIX_FMT_RGB555;
170
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4 else if (comp == BMP_BITFIELDS) {
171
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4 if (rgb[0] == 0xF800 && rgb[1] == 0x07E0 && rgb[2] == 0x001F)
172 2 avctx->pix_fmt = AV_PIX_FMT_RGB565;
173
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2 else if (rgb[0] == 0x7C00 && rgb[1] == 0x03E0 && rgb[2] == 0x001F)
174 2 avctx->pix_fmt = AV_PIX_FMT_RGB555;
175 else if (rgb[0] == 0x0F00 && rgb[1] == 0x00F0 && rgb[2] == 0x000F)
176 avctx->pix_fmt = AV_PIX_FMT_RGB444;
177 else {
178 av_log(avctx, AV_LOG_ERROR,
179 "Unknown bitfields %0"PRIX32" %0"PRIX32" %0"PRIX32"\n",
180 rgb[0], rgb[1], rgb[2]);
181 return AVERROR(EINVAL);
182 }
183 }
184 6 break;
185 6 case 8:
186
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6 if (hsize - ihsize - 14 > 0)
187 6 avctx->pix_fmt = AV_PIX_FMT_PAL8;
188 else
189 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
190 6 break;
191 8 case 1:
192 case 4:
193
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8 if (hsize - ihsize - 14 > 0) {
194 8 avctx->pix_fmt = AV_PIX_FMT_PAL8;
195 } else {
196 av_log(avctx, AV_LOG_ERROR, "Unknown palette for %u-colour BMP\n",
197 1 << depth);
198 return AVERROR_INVALIDDATA;
199 }
200 8 break;
201 default:
202 av_log(avctx, AV_LOG_ERROR, "depth %u not supported\n", depth);
203 return AVERROR_INVALIDDATA;
204 }
205
206
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51 if (avctx->pix_fmt == AV_PIX_FMT_NONE) {
207 av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
208 return AVERROR_INVALIDDATA;
209 }
210
211
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51 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
212 return ret;
213 51 p->pict_type = AV_PICTURE_TYPE_I;
214 51 p->key_frame = 1;
215
216 51 buf = buf0 + hsize;
217 51 dsize = buf_size - hsize;
218
219 /* Line size in file multiple of 4 */
220 51 n = ((avctx->width * depth + 31) / 8) & ~3;
221
222
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51 if (n * avctx->height > dsize && comp != BMP_RLE4 && comp != BMP_RLE8) {
223 n = (avctx->width * depth + 7) / 8;
224 if (n * avctx->height > dsize) {
225 av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
226 dsize, n * avctx->height);
227 return AVERROR_INVALIDDATA;
228 }
229 av_log(avctx, AV_LOG_ERROR, "data size too small, assuming missing line alignment\n");
230 }
231
232 // RLE may skip decoding some picture areas, so blank picture before decoding
233
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51 if (comp == BMP_RLE4 || comp == BMP_RLE8)
234 4 memset(p->data[0], 0, avctx->height * p->linesize[0]);
235
236
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51 if (height > 0) {
237 51 ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
238 51 linesize = -p->linesize[0];
239 } else {
240 ptr = p->data[0];
241 linesize = p->linesize[0];
242 }
243
244
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51 if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
245 14 int colors = 1 << depth;
246
247 14 memset(p->data[1], 0, 1024);
248
249
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14 if (ihsize >= 36) {
250 int t;
251 12 buf = buf0 + 46;
252 12 t = bytestream_get_le32(&buf);
253
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12 if (t < 0 || t > (1 << depth)) {
254 av_log(avctx, AV_LOG_ERROR,
255 "Incorrect number of colors - %X for bitdepth %u\n",
256 t, depth);
257
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12 } else if (t) {
258 2 colors = t;
259 }
260 } else {
261
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2 colors = FFMIN(256, (hsize-ihsize-14) / 3);
262 }
263 14 buf = buf0 + 14 + ihsize; //palette location
264 // OS/2 bitmap, 3 bytes per palette entry
265
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14 if ((hsize-ihsize-14) < (colors << 2)) {
266
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2 if ((hsize-ihsize-14) < colors * 3) {
267 av_log(avctx, AV_LOG_ERROR, "palette doesn't fit in packet\n");
268 return AVERROR_INVALIDDATA;
269 }
270
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514 for (i = 0; i < colors; i++)
271 512 ((uint32_t*)p->data[1])[i] = (0xFFU<<24) | bytestream_get_le24(&buf);
272 } else {
273
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1136 for (i = 0; i < colors; i++)
274 1124 ((uint32_t*)p->data[1])[i] = 0xFFU << 24 | bytestream_get_le32(&buf);
275 }
276 14 buf = buf0 + hsize;
277 }
278
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51 if (comp == BMP_RLE4 || comp == BMP_RLE8) {
279
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4 if (comp == BMP_RLE8 && height < 0) {
280 p->data[0] += p->linesize[0] * (avctx->height - 1);
281 p->linesize[0] = -p->linesize[0];
282 }
283 4 bytestream2_init(&gb, buf, dsize);
284 4 ff_msrle_decode(avctx, p, depth, &gb);
285
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4 if (height < 0) {
286 p->data[0] += p->linesize[0] * (avctx->height - 1);
287 p->linesize[0] = -p->linesize[0];
288 }
289 } else {
290
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47 switch (depth) {
291 2 case 1:
292
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130 for (i = 0; i < avctx->height; i++) {
293 int j;
294
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2048 for (j = 0; j < avctx->width >> 3; j++) {
295 1920 ptr[j*8+0] = buf[j] >> 7;
296 1920 ptr[j*8+1] = (buf[j] >> 6) & 1;
297 1920 ptr[j*8+2] = (buf[j] >> 5) & 1;
298 1920 ptr[j*8+3] = (buf[j] >> 4) & 1;
299 1920 ptr[j*8+4] = (buf[j] >> 3) & 1;
300 1920 ptr[j*8+5] = (buf[j] >> 2) & 1;
301 1920 ptr[j*8+6] = (buf[j] >> 1) & 1;
302 1920 ptr[j*8+7] = buf[j] & 1;
303 }
304
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1024 for (j = 0; j < (avctx->width & 7); j++) {
305 896 ptr[avctx->width - (avctx->width & 7) + j] = buf[avctx->width >> 3] >> (7 - j) & 1;
306 }
307 128 buf += n;
308 128 ptr += linesize;
309 }
310 2 break;
311 35 case 8:
312 case 24:
313 case 32:
314
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6435 for (i = 0; i < avctx->height; i++) {
315 6400 memcpy(ptr, buf, n);
316 6400 buf += n;
317 6400 ptr += linesize;
318 }
319 35 break;
320 4 case 4:
321
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176 for (i = 0; i < avctx->height; i++) {
322 int j;
323
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15052 for (j = 0; j < n; j++) {
324 14880 ptr[j*2+0] = (buf[j] >> 4) & 0xF;
325 14880 ptr[j*2+1] = buf[j] & 0xF;
326 }
327 172 buf += n;
328 172 ptr += linesize;
329 }
330 4 break;
331 6 case 16:
332
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390 for (i = 0; i < avctx->height; i++) {
333 384 const uint16_t *src = (const uint16_t *) buf;
334 384 uint16_t *dst = (uint16_t *) ptr;
335
336
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49152 for (j = 0; j < avctx->width; j++)
337 48768 *dst++ = av_le2ne16(*src++);
338
339 384 buf += n;
340 384 ptr += linesize;
341 }
342 6 break;
343 default:
344 av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n");
345 return AVERROR_INVALIDDATA;
346 }
347 }
348
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51 if (avctx->pix_fmt == AV_PIX_FMT_BGRA) {
349
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130 for (i = 0; i < avctx->height; i++) {
350 int j;
351 128 uint8_t *ptr = p->data[0] + p->linesize[0]*i + 3;
352
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16384 for (j = 0; j < avctx->width; j++) {
353
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16256 if (ptr[4*j])
354 break;
355 }
356
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128 if (j < avctx->width)
357 break;
358 }
359
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2 if (i == avctx->height)
360 2 avctx->pix_fmt = p->format = AV_PIX_FMT_BGR0;
361 }
362
363 51 *got_frame = 1;
364
365 51 return buf_size;
366 }
367
368 const AVCodec ff_bmp_decoder = {
369 .name = "bmp",
370 .long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
371 .type = AVMEDIA_TYPE_VIDEO,
372 .id = AV_CODEC_ID_BMP,
373 .decode = bmp_decode_frame,
374 .capabilities = AV_CODEC_CAP_DR1,
375 };
376