1/* 2 * BMP image format encoder 3 * Copyright (c) 2006, 2007 Michel Bardiaux 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 "avcodec.h" 23#include "bytestream.h" 24#include "bmp.h" 25 26static av_cold int bmp_encode_init(AVCodecContext *avctx){ 27 BMPContext *s = avctx->priv_data; 28 29 avcodec_get_frame_defaults((AVFrame*)&s->picture); 30 avctx->coded_frame = (AVFrame*)&s->picture; 31 32 return 0; 33} 34 35static int bmp_encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){ 36 BMPContext *s = avctx->priv_data; 37 AVFrame *pict = data; 38 AVFrame * const p= (AVFrame*)&s->picture; 39 int n_bytes_image, n_bytes_per_row, n_bytes, i, n, hsize; 40 uint8_t *ptr; 41 unsigned char* buf0 = buf; 42 *p = *pict; 43 p->pict_type= FF_I_TYPE; 44 p->key_frame= 1; 45 n_bytes_per_row = (avctx->width*3 + 3) & ~3; 46 n_bytes_image = avctx->height*n_bytes_per_row; 47 48 // STRUCTURE.field refer to the MSVC documentation for BITMAPFILEHEADER 49 // and related pages. 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); 56 return -1; 57 } 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]; 77 buf = buf0 + hsize; 78 for(i = 0; i < avctx->height; i++) { 79 n = 3*avctx->width; 80 memcpy(buf, ptr, n); 81 buf += n; 82 memset(buf, 0, n_bytes_per_row-n); 83 buf += n_bytes_per_row-n; 84 ptr -= p->linesize[0]; // ... and go back 85 } 86 return n_bytes; 87} 88 89AVCodec bmp_encoder = { 90 "bmp", 91 CODEC_TYPE_VIDEO, 92 CODEC_ID_BMP, 93 sizeof(BMPContext), 94 bmp_encode_init, 95 bmp_encode_frame, 96 NULL, //encode_end, 97 .pix_fmts= (enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_NONE}, 98 .long_name = NULL_IF_CONFIG_SMALL("BMP image"), 99}; 100