mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-12 19:18:44 +02:00
743311a1b0
Originally committed as revision 6844 to svn://svn.ffmpeg.org/ffmpeg/trunk
255 lines
6.3 KiB
C
255 lines
6.3 KiB
C
/*
|
|
* BMP image format
|
|
* Copyright (c) 2005 Mans Rullgard
|
|
*
|
|
* 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 "bitstream.h"
|
|
#include "bswap.h"
|
|
|
|
typedef struct BMPContext {
|
|
AVFrame picture;
|
|
} BMPContext;
|
|
|
|
#define BMP_RGB 0
|
|
#define BMP_RLE8 1
|
|
#define BMP_RLE4 2
|
|
#define BMP_BITFIELDS 3
|
|
|
|
#define read16(bits) bswap_16(get_bits(bits, 16))
|
|
#define read32(bits) bswap_32(get_bits_long(bits, 32))
|
|
|
|
static int bmp_decode_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_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
uint8_t *buf, int buf_size)
|
|
{
|
|
BMPContext *s = avctx->priv_data;
|
|
AVFrame *picture = data;
|
|
AVFrame *p = &s->picture;
|
|
GetBitContext bits;
|
|
unsigned int fsize, hsize;
|
|
int width, height;
|
|
unsigned int depth;
|
|
unsigned int comp;
|
|
unsigned int ihsize;
|
|
int i, j, n, linesize;
|
|
uint32_t rgb[3];
|
|
uint8_t *ptr;
|
|
int dsize;
|
|
|
|
if(buf_size < 14){
|
|
av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size);
|
|
return -1;
|
|
}
|
|
|
|
init_get_bits(&bits, buf, buf_size);
|
|
|
|
if(get_bits(&bits, 16) != 0x424d){ /* 'BM' */
|
|
av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
|
|
return -1;
|
|
}
|
|
|
|
fsize = read32(&bits);
|
|
if(buf_size < fsize){
|
|
av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
|
|
buf_size, fsize);
|
|
return -1;
|
|
}
|
|
|
|
skip_bits(&bits, 16); /* reserved1 */
|
|
skip_bits(&bits, 16); /* reserved2 */
|
|
|
|
hsize = read32(&bits); /* header size */
|
|
if(fsize <= hsize){
|
|
av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
|
|
fsize, hsize);
|
|
return -1;
|
|
}
|
|
|
|
ihsize = read32(&bits); /* more header size */
|
|
if(ihsize + 14 > hsize){
|
|
av_log(avctx, AV_LOG_ERROR, "invalid header size %d\n", hsize);
|
|
return -1;
|
|
}
|
|
|
|
width = read32(&bits);
|
|
height = read32(&bits);
|
|
|
|
if(read16(&bits) != 1){ /* planes */
|
|
av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n");
|
|
return -1;
|
|
}
|
|
|
|
depth = read16(&bits);
|
|
|
|
if(ihsize > 16)
|
|
comp = read32(&bits);
|
|
else
|
|
comp = BMP_RGB;
|
|
|
|
if(comp != BMP_RGB && comp != BMP_BITFIELDS){
|
|
av_log(avctx, AV_LOG_ERROR, "BMP coding %d not supported\n", comp);
|
|
return -1;
|
|
}
|
|
|
|
if(comp == BMP_BITFIELDS){
|
|
skip_bits(&bits, 20 * 8);
|
|
rgb[0] = read32(&bits);
|
|
rgb[1] = read32(&bits);
|
|
rgb[2] = read32(&bits);
|
|
}
|
|
|
|
avctx->codec_id = CODEC_ID_BMP;
|
|
avctx->width = width;
|
|
avctx->height = height > 0? height: -height;
|
|
|
|
avctx->pix_fmt = PIX_FMT_NONE;
|
|
|
|
switch(depth){
|
|
case 32:
|
|
if(comp == BMP_BITFIELDS){
|
|
rgb[0] = (rgb[0] >> 15) & 3;
|
|
rgb[1] = (rgb[1] >> 15) & 3;
|
|
rgb[2] = (rgb[2] >> 15) & 3;
|
|
|
|
if(rgb[0] + rgb[1] + rgb[2] != 3 ||
|
|
rgb[0] == rgb[1] || rgb[0] == rgb[2] || rgb[1] == rgb[2]){
|
|
break;
|
|
}
|
|
} else {
|
|
rgb[0] = 2;
|
|
rgb[1] = 1;
|
|
rgb[2] = 0;
|
|
}
|
|
|
|
avctx->pix_fmt = PIX_FMT_BGR24;
|
|
break;
|
|
case 24:
|
|
avctx->pix_fmt = PIX_FMT_BGR24;
|
|
break;
|
|
case 16:
|
|
if(comp == BMP_RGB)
|
|
avctx->pix_fmt = PIX_FMT_RGB555;
|
|
break;
|
|
default:
|
|
av_log(avctx, AV_LOG_ERROR, "depth %d not supported\n", depth);
|
|
return -1;
|
|
}
|
|
|
|
if(avctx->pix_fmt == PIX_FMT_NONE){
|
|
av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
|
|
return -1;
|
|
}
|
|
|
|
p->reference = 0;
|
|
if(avctx->get_buffer(avctx, p) < 0){
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
p->pict_type = FF_I_TYPE;
|
|
p->key_frame = 1;
|
|
|
|
buf += hsize;
|
|
dsize = buf_size - hsize;
|
|
|
|
/* Line size in file multiple of 4 */
|
|
n = (avctx->width * (depth / 8) + 3) & ~3;
|
|
|
|
if(n * avctx->height > dsize){
|
|
av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
|
|
dsize, n * avctx->height);
|
|
return -1;
|
|
}
|
|
|
|
if(height > 0){
|
|
ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
|
|
linesize = -p->linesize[0];
|
|
} else {
|
|
ptr = p->data[0];
|
|
linesize = p->linesize[0];
|
|
}
|
|
|
|
switch(depth){
|
|
case 24:
|
|
for(i = 0; i < avctx->height; i++){
|
|
memcpy(ptr, buf, n);
|
|
buf += n;
|
|
ptr += linesize;
|
|
}
|
|
break;
|
|
case 16:
|
|
for(i = 0; i < avctx->height; i++){
|
|
uint16_t *src = (uint16_t *) buf;
|
|
uint16_t *dst = (uint16_t *) ptr;
|
|
|
|
for(j = 0; j < avctx->width; j++)
|
|
*dst++ = le2me_16(*src++);
|
|
|
|
buf += n;
|
|
ptr += linesize;
|
|
}
|
|
break;
|
|
case 32:
|
|
for(i = 0; i < avctx->height; i++){
|
|
uint8_t *src = buf;
|
|
uint8_t *dst = ptr;
|
|
|
|
for(j = 0; j < avctx->width; j++){
|
|
dst[0] = src[rgb[2]];
|
|
dst[1] = src[rgb[1]];
|
|
dst[2] = src[rgb[0]];
|
|
dst += 3;
|
|
src += 4;
|
|
}
|
|
|
|
buf += n;
|
|
ptr += linesize;
|
|
}
|
|
break;
|
|
default:
|
|
av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n");
|
|
return -1;
|
|
}
|
|
|
|
*picture = s->picture;
|
|
*data_size = sizeof(AVPicture);
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
AVCodec bmp_decoder = {
|
|
"bmp",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_BMP,
|
|
sizeof(BMPContext),
|
|
bmp_decode_init,
|
|
NULL,
|
|
NULL,
|
|
bmp_decode_frame
|
|
};
|