FFmpeg: libavcodec/bmp.c Source File

FFmpeg
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;
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  av_log(avctx, AV_LOG_ERROR, "unsupported BMP file, patch welcome\n");
104  return AVERROR_PATCHWELCOME;
105  }
106 
107  /* planes */
108  if (bytestream_get_le16(&buf) != 1) {
109  av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n");
110  return AVERROR_INVALIDDATA;
111  }
112 
113  depth = bytestream_get_le16(&buf);
114 
115  if (ihsize >= 40)
116  comp = bytestream_get_le32(&buf);
117  else
118  comp = BMP_RGB;
119 
120  if (comp != BMP_RGB && comp != BMP_BITFIELDS && comp != BMP_RLE4 &&
121  comp != BMP_RLE8) {
122  av_log(avctx, AV_LOG_ERROR, "BMP coding %d not supported\n", comp);
123  return AVERROR_INVALIDDATA;
124  }
125 
126  if (comp == BMP_BITFIELDS) {
127  buf += 20;
128  rgb[0] = bytestream_get_le32(&buf);
129  rgb[1] = bytestream_get_le32(&buf);
130  rgb[2] = bytestream_get_le32(&buf);
131  if (ihsize > 40)
132  alpha = bytestream_get_le32(&buf);
133  }
134 
135  avctx->width = width;
136  avctx->height = height > 0 ? height : -height;
137 
138  avctx->pix_fmt = AV_PIX_FMT_NONE;
139 
140  switch (depth) {
141  case 32:
142  if (comp == BMP_BITFIELDS) {
143  if (rgb[0] == 0xFF000000 && rgb[1] == 0x00FF0000 && rgb[2] == 0x0000FF00)
144  avctx->pix_fmt = alpha ? AV_PIX_FMT_ABGR : AV_PIX_FMT_0BGR;
145  else if (rgb[0] == 0x00FF0000 && rgb[1] == 0x0000FF00 && rgb[2] == 0x000000FF)
146  avctx->pix_fmt = alpha ? AV_PIX_FMT_BGRA : AV_PIX_FMT_BGR0;
147  else if (rgb[0] == 0x0000FF00 && rgb[1] == 0x00FF0000 && rgb[2] == 0xFF000000)
148  avctx->pix_fmt = alpha ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
149  else if (rgb[0] == 0x000000FF && rgb[1] == 0x0000FF00 && rgb[2] == 0x00FF0000)
150  avctx->pix_fmt = alpha ? AV_PIX_FMT_RGBA : AV_PIX_FMT_RGB0;
151  else {
152  av_log(avctx, AV_LOG_ERROR, "Unknown bitfields %0X %0X %0X\n", rgb[0], rgb[1], rgb[2]);
153  return AVERROR(EINVAL);
154  }
155  } else {
156  avctx->pix_fmt = AV_PIX_FMT_BGRA;
157  }
158  break;
159  case 24:
160  avctx->pix_fmt = AV_PIX_FMT_BGR24;
161  break;
162  case 16:
163  if (comp == BMP_RGB)
164  avctx->pix_fmt = AV_PIX_FMT_RGB555;
165  else if (comp == BMP_BITFIELDS) {
166  if (rgb[0] == 0xF800 && rgb[1] == 0x07E0 && rgb[2] == 0x001F)
167  avctx->pix_fmt = AV_PIX_FMT_RGB565;
168  else if (rgb[0] == 0x7C00 && rgb[1] == 0x03E0 && rgb[2] == 0x001F)
169  avctx->pix_fmt = AV_PIX_FMT_RGB555;
170  else if (rgb[0] == 0x0F00 && rgb[1] == 0x00F0 && rgb[2] == 0x000F)
171  avctx->pix_fmt = AV_PIX_FMT_RGB444;
172  else {
173  av_log(avctx, AV_LOG_ERROR,
174  "Unknown bitfields %0"PRIX32" %0"PRIX32" %0"PRIX32"\n",
175  rgb[0], rgb[1], rgb[2]);
176  return AVERROR(EINVAL);
177  }
178  }
179  break;
180  case 8:
181  if (hsize - ihsize - 14 > 0)
182  avctx->pix_fmt = AV_PIX_FMT_PAL8;
183  else
184  avctx->pix_fmt = AV_PIX_FMT_GRAY8;
185  break;
186  case 1:
187  case 4:
188  if (hsize - ihsize - 14 > 0) {
189  avctx->pix_fmt = AV_PIX_FMT_PAL8;
190  } else {
191  av_log(avctx, AV_LOG_ERROR, "Unknown palette for %u-colour BMP\n",
192  1 << depth);
193  return AVERROR_INVALIDDATA;
194  }
195  break;
196  default:
197  av_log(avctx, AV_LOG_ERROR, "depth %u not supported\n", depth);
198  return AVERROR_INVALIDDATA;
199  }
200 
201  if (avctx->pix_fmt == AV_PIX_FMT_NONE) {
202  av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
203  return AVERROR_INVALIDDATA;
204  }
205 
206  if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
207  return ret;
208  p->pict_type = AV_PICTURE_TYPE_I;
209  p->key_frame = 1;
210 
211  buf = buf0 + hsize;
212  dsize = buf_size - hsize;
213 
214  /* Line size in file multiple of 4 */
215  n = ((avctx->width * depth + 31) / 8) & ~3;
216 
217  if (n * avctx->height > dsize && comp != BMP_RLE4 && comp != BMP_RLE8) {
218  n = (avctx->width * depth + 7) / 8;
219  if (n * avctx->height > dsize) {
220  av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
221  dsize, n * avctx->height);
222  return AVERROR_INVALIDDATA;
223  }
224  av_log(avctx, AV_LOG_ERROR, "data size too small, assuming missing line alignment\n");
225  }
226 
227  // RLE may skip decoding some picture areas, so blank picture before decoding
228  if (comp == BMP_RLE4 || comp == BMP_RLE8)
229  memset(p->data[0], 0, avctx->height * p->linesize[0]);
230 
231  if (height > 0) {
232  ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
233  linesize = -p->linesize[0];
234  } else {
235  ptr = p->data[0];
236  linesize = p->linesize[0];
237  }
238 
239  if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
240  int colors = 1 << depth;
241 
242  memset(p->data[1], 0, 1024);
243 
244  if (ihsize >= 36) {
245  int t;
246  buf = buf0 + 46;
247  t = bytestream_get_le32(&buf);
248  if (t < 0 || t > (1 << depth)) {
249  av_log(avctx, AV_LOG_ERROR,
250  "Incorrect number of colors - %X for bitdepth %u\n",
251  t, depth);
252  } else if (t) {
253  colors = t;
254  }
255  } else {
256  colors = FFMIN(256, (hsize-ihsize-14) / 3);
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  if ((hsize-ihsize-14) < colors * 3) {
262  av_log(avctx, AV_LOG_ERROR, "palette doesn't fit in packet\n");
263  return AVERROR_INVALIDDATA;
264  }
265  for (i = 0; i < colors; i++)
266  ((uint32_t*)p->data[1])[i] = (0xFFU<<24) | bytestream_get_le24(&buf);
267  } else {
268  for (i = 0; i < colors; i++)
269  ((uint32_t*)p->data[1])[i] = 0xFFU << 24 | bytestream_get_le32(&buf);
270  }
271  buf = buf0 + hsize;
272  }
273  if (comp == BMP_RLE4 || comp == BMP_RLE8) {
274  if (comp == BMP_RLE8 && height < 0) {
275  p->data[0] += p->linesize[0] * (avctx->height - 1);
276  p->linesize[0] = -p->linesize[0];
277  }
278  bytestream2_init(&gb, buf, dsize);
279  ff_msrle_decode(avctx, p, depth, &gb);
280  if (height < 0) {
281  p->data[0] += p->linesize[0] * (avctx->height - 1);
282  p->linesize[0] = -p->linesize[0];
283  }
284  } else {
285  switch (depth) {
286  case 1:
287  for (i = 0; i < avctx->height; i++) {
288  int j;
289  for (j = 0; j < n; j++) {
290  ptr[j*8+0] = buf[j] >> 7;
291  ptr[j*8+1] = (buf[j] >> 6) & 1;
292  ptr[j*8+2] = (buf[j] >> 5) & 1;
293  ptr[j*8+3] = (buf[j] >> 4) & 1;
294  ptr[j*8+4] = (buf[j] >> 3) & 1;
295  ptr[j*8+5] = (buf[j] >> 2) & 1;
296  ptr[j*8+6] = (buf[j] >> 1) & 1;
297  ptr[j*8+7] = buf[j] & 1;
298  }
299  buf += n;
300  ptr += linesize;
301  }
302  break;
303  case 8:
304  case 24:
305  case 32:
306  for (i = 0; i < avctx->height; i++) {
307  memcpy(ptr, buf, n);
308  buf += n;
309  ptr += linesize;
310  }
311  break;
312  case 4:
313  for (i = 0; i < avctx->height; i++) {
314  int j;
315  for (j = 0; j < n; j++) {
316  ptr[j*2+0] = (buf[j] >> 4) & 0xF;
317  ptr[j*2+1] = buf[j] & 0xF;
318  }
319  buf += n;
320  ptr += linesize;
321  }
322  break;
323  case 16:
324  for (i = 0; i < avctx->height; i++) {
325  const uint16_t *src = (const uint16_t *) buf;
326  uint16_t *dst = (uint16_t *) ptr;
327 
328  for (j = 0; j < avctx->width; j++)
329  *dst++ = av_le2ne16(*src++);
330 
331  buf += n;
332  ptr += linesize;
333  }
334  break;
335  default:
336  av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n");
337  return AVERROR_INVALIDDATA;
338  }
339  }
340  if (avctx->pix_fmt == AV_PIX_FMT_BGRA) {
341  for (i = 0; i < avctx->height; i++) {
342  int j;
343  uint8_t *ptr = p->data[0] + p->linesize[0]*i + 3;
344  for (j = 0; j < avctx->width; j++) {
345  if (ptr[4*j])
346  break;
347  }
348  if (j < avctx->width)
349  break;
350  }
351  if (i == avctx->height)
352  avctx->pix_fmt = p->format = AV_PIX_FMT_BGR0;
353  }
354 
355  *got_frame = 1;
356 
357  return buf_size;
358 }
359 
360  AVCodec ff_bmp_decoder = {
361  .name = "bmp",
362  .long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
363  .type = AVMEDIA_TYPE_VIDEO,
364  .id = AV_CODEC_ID_BMP,
365  .decode = bmp_decode_frame,
366  .capabilities = AV_CODEC_CAP_DR1,
367 };
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:181
ff_msrle_decode
int ff_msrle_decode(AVCodecContext *avctx, AVFrame *pic, int depth, GetByteContext *gb)
Decode stream in MS RLE format into frame.
Definition: msrledec.c:249
data
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
AVPacket::size
int size
Definition: avcodec.h:1468
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1752
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
AV_PIX_FMT_0BGR
packed BGR 8:8:8, 32bpp, XBGRXBGR... X=unused/undefined
Definition: pixfmt.h:247
BMP_BITFIELDS
Definition: bmp.h:31
AV_PIX_FMT_RGB444
#define AV_PIX_FMT_RGB444
Definition: pixfmt.h:319
AVCodec
AVCodec.
Definition: avcodec.h:3392
uint8_t
uint8_t
Definition: audio_convert.c:194
AV_PIX_FMT_RGB0
packed RGB 8:8:8, 32bpp, RGBXRGBX... X=unused/undefined
Definition: pixfmt.h:246
AV_PIX_FMT_PAL8
8 bit with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:74
BMP_RLE8
Definition: bmp.h:29
AV_PIX_FMT_ABGR
packed ABGR 8:8:8:8, 32bpp, ABGRABGR...
Definition: pixfmt.h:96
AVPacket::data
uint8_t * data
Definition: avcodec.h:1467
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
U
#define U(x)
Definition: vp56_arith.h:37
alpha
static double alpha(void *priv, double x, double y)
Definition: vf_geq.c:99
bmp_decode_frame
static int bmp_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: bmp.c:30
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVERROR
#define AVERROR(e)
Definition: error.h:43
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
AV_PIX_FMT_BGRA
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:97
AV_CODEC_ID_BMP
Definition: avcodec.h:185
AVCodec::name
const char * name
Name of the codec implementation.
Definition: avcodec.h:3399
BMP_RLE4
Definition: bmp.h:30
AV_PIX_FMT_ARGB
packed ARGB 8:8:8:8, 32bpp, ARGBARGB...
Definition: pixfmt.h:94
depth
int depth
Definition: v4l.c:62
AV_PIX_FMT_RGBA
packed RGBA 8:8:8:8, 32bpp, RGBARGBA...
Definition: pixfmt.h:95
AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:266
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:252
FFMIN
#define FFMIN(a, b)
Definition: common.h:96
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:1711
n
int n
Definition: avisynth_c.h:547
AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:66
src
#define src
Definition: vp9dsp.c:530
AVCodecContext::height
int height
Definition: avcodec.h:1711
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
AVFrame::format
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:242
avcodec.h
Libavcodec external API header.
av_le2ne16
#define av_le2ne16(x)
Definition: bswap.h:95
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:209
AVCodecContext
main external API structure.
Definition: avcodec.h:1532
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:894
buf
void * buf
Definition: avisynth_c.h:553
height
BYTE int const BYTE int int int height
Definition: avisynth_c.h:676
AV_PIX_FMT_BGR0
packed BGR 8:8:8, 32bpp, BGRXBGRX... X=unused/undefined
Definition: pixfmt.h:248
BMP_RGB
Definition: bmp.h:28
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:192
AV_PIX_FMT_GRAY8
Y , 8bpp.
Definition: pixfmt.h:71
internal.h
common internal api header.
AV_PIX_FMT_RGB555
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:318
BiCompression
BiCompression
Definition: bmp.h:27
AVFrame::key_frame
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:247
AV_PIX_FMT_RGB565
#define AV_PIX_FMT_RGB565
Definition: pixfmt.h:317
ff_bmp_decoder
AVCodec ff_bmp_decoder
Definition: bmp.c:360
comp
static void comp(unsigned char *dst, int dst_stride, unsigned char *src, int src_stride, int add)
Definition: eamad.c:83
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:193
AV_PIX_FMT_0RGB
packed RGB 8:8:8, 32bpp, XRGBXRGB... X=unused/undefined
Definition: pixfmt.h:245
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1444
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:856
width
static int width
Definition: demuxing_decoding.c:39
Generated on Mon Feb 15 2016 15:20:37 for FFmpeg by   doxygen 1.8.6

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