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bmp.c
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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 
30 static 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;
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  ret = ff_set_dimensions(avctx, width, height > 0 ? height : -(unsigned)height);
137  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  avctx->pix_fmt = AV_PIX_FMT_NONE;
143 
144  switch (depth) {
145  case 32:
146  if (comp == BMP_BITFIELDS) {
147  if (rgb[0] == 0xFF000000 && rgb[1] == 0x00FF0000 && rgb[2] == 0x0000FF00)
148  avctx->pix_fmt = alpha ? AV_PIX_FMT_ABGR : AV_PIX_FMT_0BGR;
149  else if (rgb[0] == 0x00FF0000 && rgb[1] == 0x0000FF00 && rgb[2] == 0x000000FF)
150  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  avctx->pix_fmt = AV_PIX_FMT_BGRA;
162  }
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,
179  "Unknown bitfields %0"PRIX32" %0"PRIX32" %0"PRIX32"\n",
180  rgb[0], rgb[1], rgb[2]);
181  return AVERROR(EINVAL);
182  }
183  }
184  break;
185  case 8:
186  if (hsize - ihsize - 14 > 0)
187  avctx->pix_fmt = AV_PIX_FMT_PAL8;
188  else
189  avctx->pix_fmt = AV_PIX_FMT_GRAY8;
190  break;
191  case 1:
192  case 4:
193  if (hsize - ihsize - 14 > 0) {
194  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  break;
201  default:
202  av_log(avctx, AV_LOG_ERROR, "depth %u not supported\n", depth);
203  return AVERROR_INVALIDDATA;
204  }
205 
206  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  if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
212  return ret;
214  p->key_frame = 1;
215 
216  buf = buf0 + hsize;
217  dsize = buf_size - hsize;
218 
219  /* Line size in file multiple of 4 */
220  n = ((avctx->width * depth + 31) / 8) & ~3;
221 
222  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  if (comp == BMP_RLE4 || comp == BMP_RLE8)
234  memset(p->data[0], 0, avctx->height * p->linesize[0]);
235 
236  if (height > 0) {
237  ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
238  linesize = -p->linesize[0];
239  } else {
240  ptr = p->data[0];
241  linesize = p->linesize[0];
242  }
243 
244  if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
245  int colors = 1 << depth;
246 
247  memset(p->data[1], 0, 1024);
248 
249  if (ihsize >= 36) {
250  int t;
251  buf = buf0 + 46;
252  t = bytestream_get_le32(&buf);
253  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  } else if (t) {
258  colors = t;
259  }
260  } else {
261  colors = FFMIN(256, (hsize-ihsize-14) / 3);
262  }
263  buf = buf0 + 14 + ihsize; //palette location
264  // OS/2 bitmap, 3 bytes per palette entry
265  if ((hsize-ihsize-14) < (colors << 2)) {
266  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  for (i = 0; i < colors; i++)
271  ((uint32_t*)p->data[1])[i] = (0xFFU<<24) | bytestream_get_le24(&buf);
272  } else {
273  for (i = 0; i < colors; i++)
274  ((uint32_t*)p->data[1])[i] = 0xFFU << 24 | bytestream_get_le32(&buf);
275  }
276  buf = buf0 + hsize;
277  }
278  if (comp == BMP_RLE4 || comp == BMP_RLE8) {
279  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  bytestream2_init(&gb, buf, dsize);
284  ff_msrle_decode(avctx, p, depth, &gb);
285  if (height < 0) {
286  p->data[0] += p->linesize[0] * (avctx->height - 1);
287  p->linesize[0] = -p->linesize[0];
288  }
289  } else {
290  switch (depth) {
291  case 1:
292  for (i = 0; i < avctx->height; i++) {
293  int j;
294  for (j = 0; j < n; j++) {
295  ptr[j*8+0] = buf[j] >> 7;
296  ptr[j*8+1] = (buf[j] >> 6) & 1;
297  ptr[j*8+2] = (buf[j] >> 5) & 1;
298  ptr[j*8+3] = (buf[j] >> 4) & 1;
299  ptr[j*8+4] = (buf[j] >> 3) & 1;
300  ptr[j*8+5] = (buf[j] >> 2) & 1;
301  ptr[j*8+6] = (buf[j] >> 1) & 1;
302  ptr[j*8+7] = buf[j] & 1;
303  }
304  buf += n;
305  ptr += linesize;
306  }
307  break;
308  case 8:
309  case 24:
310  case 32:
311  for (i = 0; i < avctx->height; i++) {
312  memcpy(ptr, buf, n);
313  buf += n;
314  ptr += linesize;
315  }
316  break;
317  case 4:
318  for (i = 0; i < avctx->height; i++) {
319  int j;
320  for (j = 0; j < n; j++) {
321  ptr[j*2+0] = (buf[j] >> 4) & 0xF;
322  ptr[j*2+1] = buf[j] & 0xF;
323  }
324  buf += n;
325  ptr += linesize;
326  }
327  break;
328  case 16:
329  for (i = 0; i < avctx->height; i++) {
330  const uint16_t *src = (const uint16_t *) buf;
331  uint16_t *dst = (uint16_t *) ptr;
332 
333  for (j = 0; j < avctx->width; j++)
334  *dst++ = av_le2ne16(*src++);
335 
336  buf += n;
337  ptr += linesize;
338  }
339  break;
340  default:
341  av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n");
342  return AVERROR_INVALIDDATA;
343  }
344  }
345  if (avctx->pix_fmt == AV_PIX_FMT_BGRA) {
346  for (i = 0; i < avctx->height; i++) {
347  int j;
348  uint8_t *ptr = p->data[0] + p->linesize[0]*i + 3;
349  for (j = 0; j < avctx->width; j++) {
350  if (ptr[4*j])
351  break;
352  }
353  if (j < avctx->width)
354  break;
355  }
356  if (i == avctx->height)
357  avctx->pix_fmt = p->format = AV_PIX_FMT_BGR0;
358  }
359 
360  *got_frame = 1;
361 
362  return buf_size;
363 }
364 
366  .name = "bmp",
367  .long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
368  .type = AVMEDIA_TYPE_VIDEO,
369  .id = AV_CODEC_ID_BMP,
370  .decode = bmp_decode_frame,
371  .capabilities = AV_CODEC_CAP_DR1,
372 };
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static float alpha(float a)
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
int ff_msrle_decode(AVCodecContext *avctx, AVFrame *pic, int depth, GetByteContext *gb)
Decode stream in MS RLE format into frame.
Definition: msrledec.c:249
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:211
int size
Definition: avcodec.h:1673
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1982
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
packed BGR 8:8:8, 32bpp, XBGRXBGR... X=unused/undefined
Definition: pixfmt.h:253
#define AV_PIX_FMT_RGB444
Definition: pixfmt.h:368
#define src
Definition: vp8dsp.c:254
AVCodec.
Definition: avcodec.h:3730
uint8_t
packed RGB 8:8:8, 32bpp, RGBXRGBX... X=unused/undefined
Definition: pixfmt.h:252
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:73
Definition: bmp.h:29
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:95
#define height
uint8_t * data
Definition: avcodec.h:1672
#define av_log(a,...)
#define U(x)
Definition: vp56_arith.h:37
static int bmp_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: bmp.c:30
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:179
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:96
uint16_t width
Definition: gdv.c:47
const char * name
Name of the codec implementation.
Definition: avcodec.h:3737
Definition: bmp.h:30
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:93
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:94
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:284
#define FFMIN(a, b)
Definition: common.h:96
int width
picture width / height.
Definition: avcodec.h:1941
int n
Definition: avisynth_c.h:684
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:65
static void comp(unsigned char *dst, ptrdiff_t dst_stride, unsigned char *src, ptrdiff_t src_stride, int add)
Definition: eamad.c:83
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:274
Libavcodec external API header.
#define av_le2ne16(x)
Definition: bswap.h:95
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:232
main external API structure.
Definition: avcodec.h:1754
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1663
void * buf
Definition: avisynth_c.h:690
packed BGR 8:8:8, 32bpp, BGRXBGRX... X=unused/undefined
Definition: pixfmt.h:254
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
Definition: bmp.h:28
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:215
Y , 8bpp.
Definition: pixfmt.h:70
common internal api header.
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:367
BiCompression
Definition: bmp.h:27
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:279
#define AV_PIX_FMT_RGB565
Definition: pixfmt.h:366
AVCodec ff_bmp_decoder
Definition: bmp.c:365
static int64_t fsize(FILE *f)
Definition: audiomatch.c:28
packed RGB 8:8:8, 32bpp, XRGBXRGB... X=unused/undefined
Definition: pixfmt.h:251
This structure stores compressed data.
Definition: avcodec.h:1649
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:1002