mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-21 06:50:44 +00:00
175 lines
6.7 KiB
C
175 lines
6.7 KiB
C
/*
|
|
* BMP image format encoder
|
|
* Copyright (c) 2006, 2007 Michel Bardiaux
|
|
* Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
|
|
*
|
|
* 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 "config.h"
|
|
|
|
#include "libavutil/imgutils.h"
|
|
#include "libavutil/avassert.h"
|
|
#include "avcodec.h"
|
|
#include "bytestream.h"
|
|
#include "bmp.h"
|
|
#include "codec_internal.h"
|
|
#include "encode.h"
|
|
|
|
static const uint32_t monoblack_pal[] = { 0x000000, 0xFFFFFF };
|
|
static const uint32_t rgb565_masks[] = { 0xF800, 0x07E0, 0x001F };
|
|
static const uint32_t rgb444_masks[] = { 0x0F00, 0x00F0, 0x000F };
|
|
|
|
static av_cold int bmp_encode_init(AVCodecContext *avctx){
|
|
switch (avctx->pix_fmt) {
|
|
case AV_PIX_FMT_BGRA:
|
|
avctx->bits_per_coded_sample = 32;
|
|
break;
|
|
case AV_PIX_FMT_BGR24:
|
|
avctx->bits_per_coded_sample = 24;
|
|
break;
|
|
case AV_PIX_FMT_RGB555:
|
|
case AV_PIX_FMT_RGB565:
|
|
case AV_PIX_FMT_RGB444:
|
|
avctx->bits_per_coded_sample = 16;
|
|
break;
|
|
case AV_PIX_FMT_RGB8:
|
|
case AV_PIX_FMT_BGR8:
|
|
case AV_PIX_FMT_RGB4_BYTE:
|
|
case AV_PIX_FMT_BGR4_BYTE:
|
|
case AV_PIX_FMT_GRAY8:
|
|
case AV_PIX_FMT_PAL8:
|
|
avctx->bits_per_coded_sample = 8;
|
|
break;
|
|
case AV_PIX_FMT_MONOBLACK:
|
|
avctx->bits_per_coded_sample = 1;
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bmp_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
|
|
const AVFrame *pict, int *got_packet)
|
|
{
|
|
const AVFrame * const p = pict;
|
|
int n_bytes_image, n_bytes_per_row, n_bytes, i, n, hsize, ret;
|
|
const uint32_t *pal = NULL;
|
|
uint32_t palette256[256];
|
|
int pad_bytes_per_row, pal_entries = 0, compression = BMP_RGB;
|
|
int bit_count = avctx->bits_per_coded_sample;
|
|
const uint8_t *ptr;
|
|
uint8_t *buf;
|
|
|
|
switch (avctx->pix_fmt) {
|
|
case AV_PIX_FMT_RGB444:
|
|
compression = BMP_BITFIELDS;
|
|
pal = rgb444_masks; // abuse pal to hold color masks
|
|
pal_entries = 3;
|
|
break;
|
|
case AV_PIX_FMT_RGB565:
|
|
compression = BMP_BITFIELDS;
|
|
pal = rgb565_masks; // abuse pal to hold color masks
|
|
pal_entries = 3;
|
|
break;
|
|
case AV_PIX_FMT_RGB8:
|
|
case AV_PIX_FMT_BGR8:
|
|
case AV_PIX_FMT_RGB4_BYTE:
|
|
case AV_PIX_FMT_BGR4_BYTE:
|
|
case AV_PIX_FMT_GRAY8:
|
|
av_assert1(bit_count == 8);
|
|
avpriv_set_systematic_pal2(palette256, avctx->pix_fmt);
|
|
pal = palette256;
|
|
break;
|
|
case AV_PIX_FMT_PAL8:
|
|
pal = (uint32_t *)p->data[1];
|
|
break;
|
|
case AV_PIX_FMT_MONOBLACK:
|
|
pal = monoblack_pal;
|
|
break;
|
|
}
|
|
if (pal && !pal_entries) pal_entries = 1 << bit_count;
|
|
n_bytes_per_row = ((int64_t)avctx->width * (int64_t)bit_count + 7LL) >> 3LL;
|
|
pad_bytes_per_row = (4 - n_bytes_per_row) & 3;
|
|
n_bytes_image = avctx->height * (n_bytes_per_row + pad_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 + (pal_entries << 2);
|
|
n_bytes = n_bytes_image + hsize;
|
|
if ((ret = ff_get_encode_buffer(avctx, pkt, n_bytes, 0)) < 0)
|
|
return ret;
|
|
buf = pkt->data;
|
|
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, bit_count); // BITMAPINFOHEADER.biBitCount
|
|
bytestream_put_le32(&buf, compression); // 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
|
|
for (i = 0; i < pal_entries; i++)
|
|
bytestream_put_le32(&buf, pal[i] & 0xFFFFFF);
|
|
// BMP files are bottom-to-top so we start from the end...
|
|
ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
|
|
buf = pkt->data + hsize;
|
|
for(i = 0; i < avctx->height; i++) {
|
|
if (HAVE_BIGENDIAN && bit_count == 16) {
|
|
const uint16_t *src = (const uint16_t *) ptr;
|
|
for(n = 0; n < avctx->width; n++)
|
|
AV_WL16(buf + 2 * n, src[n]);
|
|
} else {
|
|
memcpy(buf, ptr, n_bytes_per_row);
|
|
}
|
|
buf += n_bytes_per_row;
|
|
memset(buf, 0, pad_bytes_per_row);
|
|
buf += pad_bytes_per_row;
|
|
ptr -= p->linesize[0]; // ... and go back
|
|
}
|
|
|
|
*got_packet = 1;
|
|
return 0;
|
|
}
|
|
|
|
const FFCodec ff_bmp_encoder = {
|
|
.p.name = "bmp",
|
|
CODEC_LONG_NAME("BMP (Windows and OS/2 bitmap)"),
|
|
.p.type = AVMEDIA_TYPE_VIDEO,
|
|
.p.id = AV_CODEC_ID_BMP,
|
|
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
|
|
.init = bmp_encode_init,
|
|
FF_CODEC_ENCODE_CB(bmp_encode_frame),
|
|
.p.pix_fmts = (const enum AVPixelFormat[]){
|
|
AV_PIX_FMT_BGRA, AV_PIX_FMT_BGR24,
|
|
AV_PIX_FMT_RGB565, AV_PIX_FMT_RGB555, AV_PIX_FMT_RGB444,
|
|
AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE, AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
|
|
AV_PIX_FMT_MONOBLACK,
|
|
AV_PIX_FMT_NONE
|
|
},
|
|
};
|