FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
bmpenc.c
Go to the documentation of this file.
1 /*
2  * BMP image format encoder
3  * Copyright (c) 2006, 2007 Michel Bardiaux
4  * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include "libavutil/imgutils.h"
24 #include "libavutil/avassert.h"
25 #include "avcodec.h"
26 #include "bytestream.h"
27 #include "bmp.h"
28 #include "internal.h"
29 
30 static const uint32_t monoblack_pal[] = { 0x000000, 0xFFFFFF };
31 static const uint32_t rgb565_masks[] = { 0xF800, 0x07E0, 0x001F };
32 static const uint32_t rgb444_masks[] = { 0x0F00, 0x00F0, 0x000F };
33 
35  switch (avctx->pix_fmt) {
36  case AV_PIX_FMT_BGRA:
37  avctx->bits_per_coded_sample = 32;
38  break;
39  case AV_PIX_FMT_BGR24:
40  avctx->bits_per_coded_sample = 24;
41  break;
42  case AV_PIX_FMT_RGB555:
43  case AV_PIX_FMT_RGB565:
44  case AV_PIX_FMT_RGB444:
45  avctx->bits_per_coded_sample = 16;
46  break;
47  case AV_PIX_FMT_RGB8:
48  case AV_PIX_FMT_BGR8:
51  case AV_PIX_FMT_GRAY8:
52  case AV_PIX_FMT_PAL8:
53  avctx->bits_per_coded_sample = 8;
54  break;
56  avctx->bits_per_coded_sample = 1;
57  break;
58  default:
59  av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n");
60  return AVERROR(EINVAL);
61  }
62 
63  return 0;
64 }
65 
67  const AVFrame *pict, int *got_packet)
68 {
69  const AVFrame * const p = pict;
70  int n_bytes_image, n_bytes_per_row, n_bytes, i, n, hsize, ret;
71  const uint32_t *pal = NULL;
72  uint32_t palette256[256];
73  int pad_bytes_per_row, pal_entries = 0, compression = BMP_RGB;
74  int bit_count = avctx->bits_per_coded_sample;
75  uint8_t *ptr, *buf;
76 
77 #if FF_API_CODED_FRAME
80  avctx->coded_frame->key_frame = 1;
82 #endif
83  switch (avctx->pix_fmt) {
84  case AV_PIX_FMT_RGB444:
85  compression = BMP_BITFIELDS;
86  pal = rgb444_masks; // abuse pal to hold color masks
87  pal_entries = 3;
88  break;
89  case AV_PIX_FMT_RGB565:
90  compression = BMP_BITFIELDS;
91  pal = rgb565_masks; // abuse pal to hold color masks
92  pal_entries = 3;
93  break;
94  case AV_PIX_FMT_RGB8:
95  case AV_PIX_FMT_BGR8:
98  case AV_PIX_FMT_GRAY8:
99  av_assert1(bit_count == 8);
100  avpriv_set_systematic_pal2(palette256, avctx->pix_fmt);
101  pal = palette256;
102  break;
103  case AV_PIX_FMT_PAL8:
104  pal = (uint32_t *)p->data[1];
105  break;
107  pal = monoblack_pal;
108  break;
109  }
110  if (pal && !pal_entries) pal_entries = 1 << bit_count;
111  n_bytes_per_row = ((int64_t)avctx->width * (int64_t)bit_count + 7LL) >> 3LL;
112  pad_bytes_per_row = (4 - n_bytes_per_row) & 3;
113  n_bytes_image = avctx->height * (n_bytes_per_row + pad_bytes_per_row);
114 
115  // STRUCTURE.field refer to the MSVC documentation for BITMAPFILEHEADER
116  // and related pages.
117 #define SIZE_BITMAPFILEHEADER 14
118 #define SIZE_BITMAPINFOHEADER 40
119  hsize = SIZE_BITMAPFILEHEADER + SIZE_BITMAPINFOHEADER + (pal_entries << 2);
120  n_bytes = n_bytes_image + hsize;
121  if ((ret = ff_alloc_packet2(avctx, pkt, n_bytes, 0)) < 0)
122  return ret;
123  buf = pkt->data;
124  bytestream_put_byte(&buf, 'B'); // BITMAPFILEHEADER.bfType
125  bytestream_put_byte(&buf, 'M'); // do.
126  bytestream_put_le32(&buf, n_bytes); // BITMAPFILEHEADER.bfSize
127  bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved1
128  bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved2
129  bytestream_put_le32(&buf, hsize); // BITMAPFILEHEADER.bfOffBits
130  bytestream_put_le32(&buf, SIZE_BITMAPINFOHEADER); // BITMAPINFOHEADER.biSize
131  bytestream_put_le32(&buf, avctx->width); // BITMAPINFOHEADER.biWidth
132  bytestream_put_le32(&buf, avctx->height); // BITMAPINFOHEADER.biHeight
133  bytestream_put_le16(&buf, 1); // BITMAPINFOHEADER.biPlanes
134  bytestream_put_le16(&buf, bit_count); // BITMAPINFOHEADER.biBitCount
135  bytestream_put_le32(&buf, compression); // BITMAPINFOHEADER.biCompression
136  bytestream_put_le32(&buf, n_bytes_image); // BITMAPINFOHEADER.biSizeImage
137  bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biXPelsPerMeter
138  bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biYPelsPerMeter
139  bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrUsed
140  bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrImportant
141  for (i = 0; i < pal_entries; i++)
142  bytestream_put_le32(&buf, pal[i] & 0xFFFFFF);
143  // BMP files are bottom-to-top so we start from the end...
144  ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
145  buf = pkt->data + hsize;
146  for(i = 0; i < avctx->height; i++) {
147  if (bit_count == 16) {
148  const uint16_t *src = (const uint16_t *) ptr;
149  uint16_t *dst = (uint16_t *) buf;
150  for(n = 0; n < avctx->width; n++)
151  AV_WL16(dst + n, src[n]);
152  } else {
153  memcpy(buf, ptr, n_bytes_per_row);
154  }
155  buf += n_bytes_per_row;
156  memset(buf, 0, pad_bytes_per_row);
157  buf += pad_bytes_per_row;
158  ptr -= p->linesize[0]; // ... and go back
159  }
160 
161  pkt->flags |= AV_PKT_FLAG_KEY;
162  *got_packet = 1;
163  return 0;
164 }
165 
167  .name = "bmp",
168  .long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
169  .type = AVMEDIA_TYPE_VIDEO,
170  .id = AV_CODEC_ID_BMP,
171  .init = bmp_encode_init,
172  .encode2 = bmp_encode_frame,
173  .pix_fmts = (const enum AVPixelFormat[]){
179  },
180 };
AVCodec ff_bmp_encoder
Definition: bmpenc.c:166
#define NULL
Definition: coverity.c:32
This structure describes decoded (raw) audio or video data.
Definition: frame.h:180
misc image utilities
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1870
static AVPacket pkt
#define AV_PIX_FMT_RGB444
Definition: pixfmt.h:327
#define SIZE_BITMAPINFOHEADER
AVCodec.
Definition: avcodec.h:3535
static const uint32_t rgb565_masks[]
Definition: bmpenc.c:31
packed RGB 1:2:1, 8bpp, (msb)1B 2G 1R(lsb)
Definition: pixfmt.h:86
uint8_t
#define av_cold
Definition: attributes.h:82
8 bit with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:73
int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt)
Definition: imgutils.c:151
uint8_t * data
Definition: avcodec.h:1577
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:3035
#define av_log(a,...)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1609
#define SIZE_BITMAPFILEHEADER
#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:176
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
Definition: pixfmt.h:96
simple assert() macros that are a bit more flexible than ISO C assert().
static const uint32_t monoblack_pal[]
Definition: bmpenc.c:30
const char * name
Name of the codec implementation.
Definition: avcodec.h:3542
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1583
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:254
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
packed RGB 1:2:1, 8bpp, (msb)1R 2G 1B(lsb)
Definition: pixfmt.h:89
int width
picture width / height.
Definition: avcodec.h:1829
int n
Definition: avisynth_c.h:547
packed RGB 8:8:8, 24bpp, BGRBGR...
Definition: pixfmt.h:65
#define src
Definition: vp9dsp.c:530
packed RGB 3:3:2, 8bpp, (msb)2B 3G 3R(lsb)
Definition: pixfmt.h:84
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:211
static int bmp_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)
Definition: bmpenc.c:66
main external API structure.
Definition: avcodec.h:1642
static av_cold int bmp_encode_init(AVCodecContext *avctx)
Definition: bmpenc.c:34
void * buf
Definition: avisynth_c.h:553
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.
Definition: utils.c:1683
Definition: bmp.h:28
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:194
Y , 1bpp, 0 is black, 1 is white, in each byte pixels are ordered from the msb to the lsb...
Definition: pixfmt.h:72
Y , 8bpp.
Definition: pixfmt.h:70
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:80
common internal api header.
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
Definition: avcodec.h:3063
packed RGB 3:3:2, 8bpp, (msb)2R 3G 3B(lsb)
Definition: pixfmt.h:87
#define AV_PIX_FMT_RGB555
Definition: pixfmt.h:326
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:81
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:249
#define AV_PIX_FMT_RGB565
Definition: pixfmt.h:325
#define height
AVPixelFormat
Pixel format.
Definition: pixfmt.h:60
This structure stores compressed data.
Definition: avcodec.h:1554
static const uint32_t rgb444_masks[]
Definition: bmpenc.c:32