99 lines
4.0 KiB
C
99 lines
4.0 KiB
C
/*
|
|
* 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, -1},
|
|
};
|