5ca73baa4f0fbdb70f3c392674aaf66707bb28a9
[libav.git] / libavcodec / bmp.c
1 /*
2 * BMP image format decoder
3 * Copyright (c) 2005 Mans Rullgard
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 "bmp.h"
25 #include "internal.h"
26 #include "msrledec.h"
27
28 static av_cold int bmp_decode_init(AVCodecContext *avctx)
29 {
30 BMPContext *s = avctx->priv_data;
31
32 avcodec_get_frame_defaults(&s->picture);
33 avctx->coded_frame = &s->picture;
34
35 return 0;
36 }
37
38 static int bmp_decode_frame(AVCodecContext *avctx,
39 void *data, int *got_frame,
40 AVPacket *avpkt)
41 {
42 const uint8_t *buf = avpkt->data;
43 int buf_size = avpkt->size;
44 BMPContext *s = avctx->priv_data;
45 AVFrame *picture = data;
46 AVFrame *p = &s->picture;
47 unsigned int fsize, hsize;
48 int width, height;
49 unsigned int depth;
50 BiCompression comp;
51 unsigned int ihsize;
52 int i, j, n, linesize, ret;
53 uint32_t rgb[3];
54 uint8_t *ptr;
55 int dsize;
56 const uint8_t *buf0 = buf;
57 GetByteContext gb;
58
59 if (buf_size < 14) {
60 av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size);
61 return AVERROR_INVALIDDATA;
62 }
63
64 if (bytestream_get_byte(&buf) != 'B' ||
65 bytestream_get_byte(&buf) != 'M') {
66 av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
67 return AVERROR_INVALIDDATA;
68 }
69
70 fsize = bytestream_get_le32(&buf);
71 if (buf_size < fsize) {
72 av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d), trying to decode anyway\n",
73 buf_size, fsize);
74 fsize = buf_size;
75 }
76
77 buf += 2; /* reserved1 */
78 buf += 2; /* reserved2 */
79
80 hsize = bytestream_get_le32(&buf); /* header size */
81 ihsize = bytestream_get_le32(&buf); /* more header size */
82 if (ihsize + 14 > hsize) {
83 av_log(avctx, AV_LOG_ERROR, "invalid header size %d\n", hsize);
84 return AVERROR_INVALIDDATA;
85 }
86
87 /* sometimes file size is set to some headers size, set a real size in that case */
88 if (fsize == 14 || fsize == ihsize + 14)
89 fsize = buf_size - 2;
90
91 if (fsize <= hsize) {
92 av_log(avctx, AV_LOG_ERROR, "declared file size is less than header size (%d < %d)\n",
93 fsize, hsize);
94 return AVERROR_INVALIDDATA;
95 }
96
97 switch (ihsize) {
98 case 40: // windib v3
99 case 64: // OS/2 v2
100 case 108: // windib v4
101 case 124: // windib v5
102 width = bytestream_get_le32(&buf);
103 height = bytestream_get_le32(&buf);
104 break;
105 case 12: // OS/2 v1
106 width = bytestream_get_le16(&buf);
107 height = bytestream_get_le16(&buf);
108 break;
109 default:
110 av_log(avctx, AV_LOG_ERROR, "unsupported BMP file, patch welcome\n");
111 return AVERROR_PATCHWELCOME;
112 }
113
114 /* planes */
115 if (bytestream_get_le16(&buf) != 1) {
116 av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n");
117 return AVERROR_INVALIDDATA;
118 }
119
120 depth = bytestream_get_le16(&buf);
121
122 if (ihsize == 40)
123 comp = bytestream_get_le32(&buf);
124 else
125 comp = BMP_RGB;
126
127 if (comp != BMP_RGB && comp != BMP_BITFIELDS && comp != BMP_RLE4 &&
128 comp != BMP_RLE8) {
129 av_log(avctx, AV_LOG_ERROR, "BMP coding %d not supported\n", comp);
130 return AVERROR_INVALIDDATA;
131 }
132
133 if (comp == BMP_BITFIELDS) {
134 buf += 20;
135 rgb[0] = bytestream_get_le32(&buf);
136 rgb[1] = bytestream_get_le32(&buf);
137 rgb[2] = bytestream_get_le32(&buf);
138 }
139
140 avctx->width = width;
141 avctx->height = height > 0 ? height : -height;
142
143 avctx->pix_fmt = AV_PIX_FMT_NONE;
144
145 switch (depth) {
146 case 32:
147 if (comp == BMP_BITFIELDS) {
148 rgb[0] = (rgb[0] >> 15) & 3;
149 rgb[1] = (rgb[1] >> 15) & 3;
150 rgb[2] = (rgb[2] >> 15) & 3;
151
152 if (rgb[0] + rgb[1] + rgb[2] != 3 ||
153 rgb[0] == rgb[1] || rgb[0] == rgb[2] || rgb[1] == rgb[2]) {
154 break;
155 }
156 } else {
157 rgb[0] = 2;
158 rgb[1] = 1;
159 rgb[2] = 0;
160 }
161
162 avctx->pix_fmt = AV_PIX_FMT_BGR24;
163 break;
164 case 24:
165 avctx->pix_fmt = AV_PIX_FMT_BGR24;
166 break;
167 case 16:
168 if (comp == BMP_RGB)
169 avctx->pix_fmt = AV_PIX_FMT_RGB555;
170 else if (comp == BMP_BITFIELDS) {
171 if (rgb[0] == 0xF800 && rgb[1] == 0x07E0 && rgb[2] == 0x001F)
172 avctx->pix_fmt = AV_PIX_FMT_RGB565;
173 else if (rgb[0] == 0x7C00 && rgb[1] == 0x03E0 && rgb[2] == 0x001F)
174 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, "Unknown bitfields %0X %0X %0X\n", rgb[0], rgb[1], rgb[2]);
179 return AVERROR(EINVAL);
180 }
181 }
182 break;
183 case 8:
184 if (hsize - ihsize - 14 > 0)
185 avctx->pix_fmt = AV_PIX_FMT_PAL8;
186 else
187 avctx->pix_fmt = AV_PIX_FMT_GRAY8;
188 break;
189 case 1:
190 case 4:
191 if (hsize - ihsize - 14 > 0) {
192 avctx->pix_fmt = AV_PIX_FMT_PAL8;
193 } else {
194 av_log(avctx, AV_LOG_ERROR, "Unknown palette for %d-colour BMP\n", 1<<depth);
195 return AVERROR_INVALIDDATA;
196 }
197 break;
198 default:
199 av_log(avctx, AV_LOG_ERROR, "depth %d 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 (p->data[0])
209 avctx->release_buffer(avctx, p);
210
211 p->reference = 0;
212 if ((ret = ff_get_buffer(avctx, p)) < 0) {
213 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
214 return ret;
215 }
216 p->pict_type = AV_PICTURE_TYPE_I;
217 p->key_frame = 1;
218
219 buf = buf0 + hsize;
220 dsize = buf_size - hsize;
221
222 /* Line size in file multiple of 4 */
223 n = ((avctx->width * depth) / 8 + 3) & ~3;
224
225 if (n * avctx->height > dsize && comp != BMP_RLE4 && comp != BMP_RLE8) {
226 av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
227 dsize, n * avctx->height);
228 return AVERROR_INVALIDDATA;
229 }
230
231 // RLE may skip decoding some picture areas, so blank picture before decoding
232 if (comp == BMP_RLE4 || comp == BMP_RLE8)
233 memset(p->data[0], 0, avctx->height * p->linesize[0]);
234
235 if (height > 0) {
236 ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
237 linesize = -p->linesize[0];
238 } else {
239 ptr = p->data[0];
240 linesize = p->linesize[0];
241 }
242
243 if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
244 int colors = 1 << depth;
245
246 memset(p->data[1], 0, 1024);
247
248 if (ihsize >= 36) {
249 int t;
250 buf = buf0 + 46;
251 t = bytestream_get_le32(&buf);
252 if (t < 0 || t > (1 << depth)) {
253 av_log(avctx, AV_LOG_ERROR, "Incorrect number of colors - %X for bitdepth %d\n", t, depth);
254 } else if (t) {
255 colors = t;
256 }
257 }
258 buf = buf0 + 14 + ihsize; //palette location
259 // OS/2 bitmap, 3 bytes per palette entry
260 if ((hsize-ihsize-14) < (colors << 2)) {
261 for (i = 0; i < colors; i++)
262 ((uint32_t*)p->data[1])[i] = bytestream_get_le24(&buf);
263 } else {
264 for (i = 0; i < colors; i++)
265 ((uint32_t*)p->data[1])[i] = bytestream_get_le32(&buf);
266 }
267 buf = buf0 + hsize;
268 }
269 if (comp == BMP_RLE4 || comp == BMP_RLE8) {
270 if (height < 0) {
271 p->data[0] += p->linesize[0] * (avctx->height - 1);
272 p->linesize[0] = -p->linesize[0];
273 }
274 bytestream2_init(&gb, buf, dsize);
275 ff_msrle_decode(avctx, (AVPicture*)p, depth, &gb);
276 if (height < 0) {
277 p->data[0] += p->linesize[0] * (avctx->height - 1);
278 p->linesize[0] = -p->linesize[0];
279 }
280 } else {
281 switch (depth) {
282 case 1:
283 for (i = 0; i < avctx->height; i++) {
284 int j;
285 for (j = 0; j < n; j++) {
286 ptr[j*8+0] = buf[j] >> 7;
287 ptr[j*8+1] = (buf[j] >> 6) & 1;
288 ptr[j*8+2] = (buf[j] >> 5) & 1;
289 ptr[j*8+3] = (buf[j] >> 4) & 1;
290 ptr[j*8+4] = (buf[j] >> 3) & 1;
291 ptr[j*8+5] = (buf[j] >> 2) & 1;
292 ptr[j*8+6] = (buf[j] >> 1) & 1;
293 ptr[j*8+7] = buf[j] & 1;
294 }
295 buf += n;
296 ptr += linesize;
297 }
298 break;
299 case 8:
300 case 24:
301 for (i = 0; i < avctx->height; i++) {
302 memcpy(ptr, buf, n);
303 buf += n;
304 ptr += linesize;
305 }
306 break;
307 case 4:
308 for (i = 0; i < avctx->height; i++) {
309 int j;
310 for (j = 0; j < n; j++) {
311 ptr[j*2+0] = (buf[j] >> 4) & 0xF;
312 ptr[j*2+1] = buf[j] & 0xF;
313 }
314 buf += n;
315 ptr += linesize;
316 }
317 break;
318 case 16:
319 for (i = 0; i < avctx->height; i++) {
320 const uint16_t *src = (const uint16_t *) buf;
321 uint16_t *dst = (uint16_t *) ptr;
322
323 for (j = 0; j < avctx->width; j++)
324 *dst++ = av_le2ne16(*src++);
325
326 buf += n;
327 ptr += linesize;
328 }
329 break;
330 case 32:
331 for (i = 0; i < avctx->height; i++) {
332 const uint8_t *src = buf;
333 uint8_t *dst = ptr;
334
335 for (j = 0; j < avctx->width; j++) {
336 dst[0] = src[rgb[2]];
337 dst[1] = src[rgb[1]];
338 dst[2] = src[rgb[0]];
339 dst += 3;
340 src += 4;
341 }
342
343 buf += n;
344 ptr += linesize;
345 }
346 break;
347 default:
348 av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n");
349 return AVERROR_INVALIDDATA;
350 }
351 }
352
353 *picture = s->picture;
354 *got_frame = 1;
355
356 return buf_size;
357 }
358
359 static av_cold int bmp_decode_end(AVCodecContext *avctx)
360 {
361 BMPContext* c = avctx->priv_data;
362
363 if (c->picture.data[0])
364 avctx->release_buffer(avctx, &c->picture);
365
366 return 0;
367 }
368
369 AVCodec ff_bmp_decoder = {
370 .name = "bmp",
371 .type = AVMEDIA_TYPE_VIDEO,
372 .id = AV_CODEC_ID_BMP,
373 .priv_data_size = sizeof(BMPContext),
374 .init = bmp_decode_init,
375 .close = bmp_decode_end,
376 .decode = bmp_decode_frame,
377 .capabilities = CODEC_CAP_DR1,
378 .long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
379 };