2 * BMP image format encoder
3 * Copyright (c) 2006, 2007 Michel Bardiaux
5 * This file is part of FFmpeg.
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.
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.
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
23 #include "bytestream.h"
26 static int bmp_encode_init(AVCodecContext *avctx){
27 BMPContext *s = avctx->priv_data;
29 avcodec_get_frame_defaults((AVFrame*)&s->picture);
30 avctx->coded_frame = (AVFrame*)&s->picture;
35 static int bmp_encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
36 BMPContext *s = avctx->priv_data;
38 AVFrame * const p= (AVFrame*)&s->picture;
39 int n_bytes_image, n_bytes_per_row, n_bytes, i, n, hsize;
41 unsigned char* buf0 = buf;
43 p->pict_type= FF_I_TYPE;
45 n_bytes_per_row = (avctx->width*3 + 3) & ~3;
46 n_bytes_image = avctx->height*n_bytes_per_row;
48 // STRUCTURE.field refer to the MSVC documentation for BITMAPFILEHEADER
50 #define SIZE_BITMAPFILEHEADER 14
51 #define SIZE_BITMAPINFOHEADER 40
52 hsize = SIZE_BITMAPFILEHEADER + SIZE_BITMAPINFOHEADER;
53 n_bytes = n_bytes_image + hsize;
54 if(n_bytes>buf_size) {
55 av_log(avctx, AV_LOG_ERROR, "buf size too small (need %d, got %d)\n", n_bytes, buf_size);
58 bytestream_put_byte(&buf, 'B'); // BITMAPFILEHEADER.bfType
59 bytestream_put_byte(&buf, 'M'); // do.
60 bytestream_put_le32(&buf, n_bytes); // BITMAPFILEHEADER.bfSize
61 bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved1
62 bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved2
63 bytestream_put_le32(&buf, hsize); // BITMAPFILEHEADER.bfOffBits
64 bytestream_put_le32(&buf, SIZE_BITMAPINFOHEADER); // BITMAPINFOHEADER.biSize
65 bytestream_put_le32(&buf, avctx->width); // BITMAPINFOHEADER.biWidth
66 bytestream_put_le32(&buf, avctx->height); // BITMAPINFOHEADER.biHeight
67 bytestream_put_le16(&buf, 1); // BITMAPINFOHEADER.biPlanes
68 bytestream_put_le16(&buf, 24); // BITMAPINFOHEADER.biBitCount
69 bytestream_put_le32(&buf, BMP_RGB); // BITMAPINFOHEADER.biCompression
70 bytestream_put_le32(&buf, n_bytes_image); // BITMAPINFOHEADER.biSizeImage
71 bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biXPelsPerMeter
72 bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biYPelsPerMeter
73 bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrUsed
74 bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrImportant
75 // BMP files are bottom-to-top so we start from the end...
76 ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
78 for(i = 0; i < avctx->height; i++) {
82 memset(buf, 0, n_bytes_per_row-n);
83 buf += n_bytes_per_row-n;
84 ptr -= p->linesize[0]; // ... and go back
89 AVCodec bmp_encoder = {
97 .pix_fmts= (enum PixelFormat[]){PIX_FMT_BGR24, -1},