| /* |
| * BMP image format encoder |
| * Copyright (c) 2006, 2007 Michel Bardiaux |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "avcodec.h" |
| #include "bytestream.h" |
| #include "bmp.h" |
| |
| static av_cold int bmp_encode_init(AVCodecContext *avctx){ |
| BMPContext *s = avctx->priv_data; |
| |
| avcodec_get_frame_defaults((AVFrame*)&s->picture); |
| avctx->coded_frame = (AVFrame*)&s->picture; |
| |
| return 0; |
| } |
| |
| static int bmp_encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){ |
| BMPContext *s = avctx->priv_data; |
| AVFrame *pict = data; |
| AVFrame * const p= (AVFrame*)&s->picture; |
| int n_bytes_image, n_bytes_per_row, n_bytes, i, n, hsize; |
| uint8_t *ptr; |
| unsigned char* buf0 = buf; |
| *p = *pict; |
| p->pict_type= FF_I_TYPE; |
| p->key_frame= 1; |
| n_bytes_per_row = (avctx->width*3 + 3) & ~3; |
| n_bytes_image = avctx->height*n_bytes_per_row; |
| |
| // STRUCTURE.field refer to the MSVC documentation for BITMAPFILEHEADER |
| // and related pages. |
| #define SIZE_BITMAPFILEHEADER 14 |
| #define SIZE_BITMAPINFOHEADER 40 |
| hsize = SIZE_BITMAPFILEHEADER + SIZE_BITMAPINFOHEADER; |
| n_bytes = n_bytes_image + hsize; |
| if(n_bytes>buf_size) { |
| av_log(avctx, AV_LOG_ERROR, "buf size too small (need %d, got %d)\n", n_bytes, buf_size); |
| return -1; |
| } |
| bytestream_put_byte(&buf, 'B'); // BITMAPFILEHEADER.bfType |
| bytestream_put_byte(&buf, 'M'); // do. |
| bytestream_put_le32(&buf, n_bytes); // BITMAPFILEHEADER.bfSize |
| bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved1 |
| bytestream_put_le16(&buf, 0); // BITMAPFILEHEADER.bfReserved2 |
| bytestream_put_le32(&buf, hsize); // BITMAPFILEHEADER.bfOffBits |
| bytestream_put_le32(&buf, SIZE_BITMAPINFOHEADER); // BITMAPINFOHEADER.biSize |
| bytestream_put_le32(&buf, avctx->width); // BITMAPINFOHEADER.biWidth |
| bytestream_put_le32(&buf, avctx->height); // BITMAPINFOHEADER.biHeight |
| bytestream_put_le16(&buf, 1); // BITMAPINFOHEADER.biPlanes |
| bytestream_put_le16(&buf, 24); // BITMAPINFOHEADER.biBitCount |
| bytestream_put_le32(&buf, BMP_RGB); // BITMAPINFOHEADER.biCompression |
| bytestream_put_le32(&buf, n_bytes_image); // BITMAPINFOHEADER.biSizeImage |
| bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biXPelsPerMeter |
| bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biYPelsPerMeter |
| bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrUsed |
| bytestream_put_le32(&buf, 0); // BITMAPINFOHEADER.biClrImportant |
| // BMP files are bottom-to-top so we start from the end... |
| ptr = p->data[0] + (avctx->height - 1) * p->linesize[0]; |
| buf = buf0 + hsize; |
| for(i = 0; i < avctx->height; i++) { |
| n = 3*avctx->width; |
| memcpy(buf, ptr, n); |
| buf += n; |
| memset(buf, 0, n_bytes_per_row-n); |
| buf += n_bytes_per_row-n; |
| ptr -= p->linesize[0]; // ... and go back |
| } |
| return n_bytes; |
| } |
| |
| AVCodec bmp_encoder = { |
| "bmp", |
| CODEC_TYPE_VIDEO, |
| CODEC_ID_BMP, |
| sizeof(BMPContext), |
| bmp_encode_init, |
| bmp_encode_frame, |
| NULL, //encode_end, |
| .pix_fmts= (enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_NONE}, |
| .long_name = NULL_IF_CONFIG_SMALL("BMP image"), |
| }; |