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path: root/libavcodec/bmp.c (plain)
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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
30static int bmp_decode_frame(AVCodecContext *avctx,
31 void *data, int *got_frame,
32 AVPacket *avpkt)
33{
34 const uint8_t *buf = avpkt->data;
35 int buf_size = avpkt->size;
36 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 uint32_t rgb[3] = {0};
44 uint32_t alpha = 0;
45 uint8_t *ptr;
46 int dsize;
47 const uint8_t *buf0 = buf;
48 GetByteContext gb;
49
50 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 if (bytestream_get_byte(&buf) != 'B' ||
56 bytestream_get_byte(&buf) != 'M') {
57 av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
58 return AVERROR_INVALIDDATA;
59 }
60
61 fsize = bytestream_get_le32(&buf);
62 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 buf += 2; /* reserved1 */
69 buf += 2; /* reserved2 */
70
71 hsize = bytestream_get_le32(&buf); /* header size */
72 ihsize = bytestream_get_le32(&buf); /* more header size */
73 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 if (fsize == 14 || fsize == ihsize + 14)
80 fsize = buf_size - 2;
81
82 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 switch (ihsize) {
90 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 width = bytestream_get_le32(&buf);
96 height = bytestream_get_le32(&buf);
97 break;
98 case 12: // OS/2 v1
99 width = bytestream_get_le16(&buf);
100 height = bytestream_get_le16(&buf);
101 break;
102 default:
103 avpriv_report_missing_feature(avctx, "Information header size %u",
104 ihsize);
105 return AVERROR_PATCHWELCOME;
106 }
107
108 /* planes */
109 if (bytestream_get_le16(&buf) != 1) {
110 av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n");
111 return AVERROR_INVALIDDATA;
112 }
113
114 depth = bytestream_get_le16(&buf);
115
116 if (ihsize >= 40)
117 comp = bytestream_get_le32(&buf);
118 else
119 comp = BMP_RGB;
120
121 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 if (comp == BMP_BITFIELDS) {
128 buf += 20;
129 rgb[0] = bytestream_get_le32(&buf);
130 rgb[1] = bytestream_get_le32(&buf);
131 rgb[2] = bytestream_get_le32(&buf);
132 if (ihsize > 40)
133 alpha = bytestream_get_le32(&buf);
134 }
135
136 avctx->width = width;
137 avctx->height = height > 0 ? height : -(unsigned)height;
138
139 avctx->pix_fmt = AV_PIX_FMT_NONE;
140
141 switch (depth) {
142 case 32:
143 if (comp == BMP_BITFIELDS) {
144 if (rgb[0] == 0xFF000000 && rgb[1] == 0x00FF0000 && rgb[2] == 0x0000FF00)
145 avctx->pix_fmt = alpha ? AV_PIX_FMT_ABGR : AV_PIX_FMT_0BGR;
146 else if (rgb[0] == 0x00FF0000 && rgb[1] == 0x0000FF00 && rgb[2] == 0x000000FF)
147 avctx->pix_fmt = alpha ? AV_PIX_FMT_BGRA : AV_PIX_FMT_BGR0;
148 else if (rgb[0] == 0x0000FF00 && rgb[1] == 0x00FF0000 && rgb[2] == 0xFF000000)
149 avctx->pix_fmt = alpha ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
150 else if (rgb[0] == 0x000000FF && rgb[1] == 0x0000FF00 && rgb[2] == 0x00FF0000)
151 avctx->pix_fmt = alpha ? AV_PIX_FMT_RGBA : AV_PIX_FMT_RGB0;
152 else {
153 av_log(avctx, AV_LOG_ERROR, "Unknown bitfields "
154 "%0"PRIX32" %0"PRIX32" %0"PRIX32"\n", rgb[0], rgb[1], rgb[2]);
155 return AVERROR(EINVAL);
156 }
157 } else {
158 avctx->pix_fmt = AV_PIX_FMT_BGRA;
159 }
160 break;
161 case 24:
162 avctx->pix_fmt = AV_PIX_FMT_BGR24;
163 break;
164 case 16:
165 if (comp == BMP_RGB)
166 avctx->pix_fmt = AV_PIX_FMT_RGB555;
167 else if (comp == BMP_BITFIELDS) {
168 if (rgb[0] == 0xF800 && rgb[1] == 0x07E0 && rgb[2] == 0x001F)
169 avctx->pix_fmt = AV_PIX_FMT_RGB565;
170 else if (rgb[0] == 0x7C00 && rgb[1] == 0x03E0 && rgb[2] == 0x001F)
171 avctx->pix_fmt = AV_PIX_FMT_RGB555;
172 else if (rgb[0] == 0x0F00 && rgb[1] == 0x00F0 && rgb[2] == 0x000F)
173 avctx->pix_fmt = AV_PIX_FMT_RGB444;
174 else {
175 av_log(avctx, AV_LOG_ERROR,
176 "Unknown bitfields %0"PRIX32" %0"PRIX32" %0"PRIX32"\n",
177 rgb[0], rgb[1], rgb[2]);
178 return AVERROR(EINVAL);
179 }
180 }
181 break;
182 case 8:
183 if (hsize - ihsize - 14 > 0)
184 avctx->pix_fmt = AV_PIX_FMT_PAL8;
185 else
186 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
187 break;
188 case 1:
189 case 4:
190 if (hsize - ihsize - 14 > 0) {
191 avctx->pix_fmt = AV_PIX_FMT_PAL8;
192 } else {
193 av_log(avctx, AV_LOG_ERROR, "Unknown palette for %u-colour BMP\n",
194 1 << depth);
195 return AVERROR_INVALIDDATA;
196 }
197 break;
198 default:
199 av_log(avctx, AV_LOG_ERROR, "depth %u not supported\n", depth);
200 return AVERROR_INVALIDDATA;
201 }
202
203 if (avctx->pix_fmt == AV_PIX_FMT_NONE) {
204 av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
205 return AVERROR_INVALIDDATA;
206 }
207
208 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
209 return ret;
210 p->pict_type = AV_PICTURE_TYPE_I;
211 p->key_frame = 1;
212
213 buf = buf0 + hsize;
214 dsize = buf_size - hsize;
215
216 /* Line size in file multiple of 4 */
217 n = ((avctx->width * depth + 31) / 8) & ~3;
218
219 if (n * avctx->height > dsize && comp != BMP_RLE4 && comp != BMP_RLE8) {
220 n = (avctx->width * depth + 7) / 8;
221 if (n * avctx->height > dsize) {
222 av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
223 dsize, n * avctx->height);
224 return AVERROR_INVALIDDATA;
225 }
226 av_log(avctx, AV_LOG_ERROR, "data size too small, assuming missing line alignment\n");
227 }
228
229 // RLE may skip decoding some picture areas, so blank picture before decoding
230 if (comp == BMP_RLE4 || comp == BMP_RLE8)
231 memset(p->data[0], 0, avctx->height * p->linesize[0]);
232
233 if (height > 0) {
234 ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
235 linesize = -p->linesize[0];
236 } else {
237 ptr = p->data[0];
238 linesize = p->linesize[0];
239 }
240
241 if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
242 int colors = 1 << depth;
243
244 memset(p->data[1], 0, 1024);
245
246 if (ihsize >= 36) {
247 int t;
248 buf = buf0 + 46;
249 t = bytestream_get_le32(&buf);
250 if (t < 0 || t > (1 << depth)) {
251 av_log(avctx, AV_LOG_ERROR,
252 "Incorrect number of colors - %X for bitdepth %u\n",
253 t, depth);
254 } else if (t) {
255 colors = t;
256 }
257 } else {
258 colors = FFMIN(256, (hsize-ihsize-14) / 3);
259 }
260 buf = buf0 + 14 + ihsize; //palette location
261 // OS/2 bitmap, 3 bytes per palette entry
262 if ((hsize-ihsize-14) < (colors << 2)) {
263 if ((hsize-ihsize-14) < colors * 3) {
264 av_log(avctx, AV_LOG_ERROR, "palette doesn't fit in packet\n");
265 return AVERROR_INVALIDDATA;
266 }
267 for (i = 0; i < colors; i++)
268 ((uint32_t*)p->data[1])[i] = (0xFFU<<24) | bytestream_get_le24(&buf);
269 } else {
270 for (i = 0; i < colors; i++)
271 ((uint32_t*)p->data[1])[i] = 0xFFU << 24 | bytestream_get_le32(&buf);
272 }
273 buf = buf0 + hsize;
274 }
275 if (comp == BMP_RLE4 || comp == BMP_RLE8) {
276 if (comp == BMP_RLE8 && height < 0) {
277 p->data[0] += p->linesize[0] * (avctx->height - 1);
278 p->linesize[0] = -p->linesize[0];
279 }
280 bytestream2_init(&gb, buf, dsize);
281 ff_msrle_decode(avctx, p, depth, &gb);
282 if (height < 0) {
283 p->data[0] += p->linesize[0] * (avctx->height - 1);
284 p->linesize[0] = -p->linesize[0];
285 }
286 } else {
287 switch (depth) {
288 case 1:
289 for (i = 0; i < avctx->height; i++) {
290 int j;
291 for (j = 0; j < n; j++) {
292 ptr[j*8+0] = buf[j] >> 7;
293 ptr[j*8+1] = (buf[j] >> 6) & 1;
294 ptr[j*8+2] = (buf[j] >> 5) & 1;
295 ptr[j*8+3] = (buf[j] >> 4) & 1;
296 ptr[j*8+4] = (buf[j] >> 3) & 1;
297 ptr[j*8+5] = (buf[j] >> 2) & 1;
298 ptr[j*8+6] = (buf[j] >> 1) & 1;
299 ptr[j*8+7] = buf[j] & 1;
300 }
301 buf += n;
302 ptr += linesize;
303 }
304 break;
305 case 8:
306 case 24:
307 case 32:
308 for (i = 0; i < avctx->height; i++) {
309 memcpy(ptr, buf, n);
310 buf += n;
311 ptr += linesize;
312 }
313 break;
314 case 4:
315 for (i = 0; i < avctx->height; i++) {
316 int j;
317 for (j = 0; j < n; j++) {
318 ptr[j*2+0] = (buf[j] >> 4) & 0xF;
319 ptr[j*2+1] = buf[j] & 0xF;
320 }
321 buf += n;
322 ptr += linesize;
323 }
324 break;
325 case 16:
326 for (i = 0; i < avctx->height; i++) {
327 const uint16_t *src = (const uint16_t *) buf;
328 uint16_t *dst = (uint16_t *) ptr;
329
330 for (j = 0; j < avctx->width; j++)
331 *dst++ = av_le2ne16(*src++);
332
333 buf += n;
334 ptr += linesize;
335 }
336 break;
337 default:
338 av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n");
339 return AVERROR_INVALIDDATA;
340 }
341 }
342 if (avctx->pix_fmt == AV_PIX_FMT_BGRA) {
343 for (i = 0; i < avctx->height; i++) {
344 int j;
345 uint8_t *ptr = p->data[0] + p->linesize[0]*i + 3;
346 for (j = 0; j < avctx->width; j++) {
347 if (ptr[4*j])
348 break;
349 }
350 if (j < avctx->width)
351 break;
352 }
353 if (i == avctx->height)
354 avctx->pix_fmt = p->format = AV_PIX_FMT_BGR0;
355 }
356
357 *got_frame = 1;
358
359 return buf_size;
360}
361
362AVCodec ff_bmp_decoder = {
363 .name = "bmp",
364 .long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
365 .type = AVMEDIA_TYPE_VIDEO,
366 .id = AV_CODEC_ID_BMP,
367 .decode = bmp_decode_frame,
368 .capabilities = AV_CODEC_CAP_DR1,
369};
370
generated by cgit at 2024-05-17 05:14:36 (GMT)