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