mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-29 22:40:23 +00:00
263 lines
6.8 KiB
C
263 lines
6.8 KiB
C
/*
|
|
* BMP image format decoder
|
|
* 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 "bytestream.h"
|
|
#include "bmp.h"
|
|
|
|
static av_cold 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,
|
|
const uint8_t *buf, int buf_size)
|
|
{
|
|
BMPContext *s = avctx->priv_data;
|
|
AVFrame *picture = data;
|
|
AVFrame *p = &s->picture;
|
|
unsigned int fsize, hsize;
|
|
int width, height;
|
|
unsigned int depth;
|
|
BiCompression comp;
|
|
unsigned int ihsize;
|
|
int i, j, n, linesize;
|
|
uint32_t rgb[3];
|
|
uint8_t *ptr;
|
|
int dsize;
|
|
const uint8_t *buf0 = buf;
|
|
|
|
if(buf_size < 14){
|
|
av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size);
|
|
return -1;
|
|
}
|
|
|
|
if(bytestream_get_byte(&buf) != 'B' ||
|
|
bytestream_get_byte(&buf) != 'M') {
|
|
av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
|
|
return -1;
|
|
}
|
|
|
|
fsize = bytestream_get_le32(&buf);
|
|
if(buf_size < fsize){
|
|
av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
|
|
buf_size, fsize);
|
|
return -1;
|
|
}
|
|
|
|
buf += 2; /* reserved1 */
|
|
buf += 2; /* reserved2 */
|
|
|
|
hsize = bytestream_get_le32(&buf); /* header size */
|
|
if(fsize <= hsize){
|
|
av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
|
|
fsize, hsize);
|
|
return -1;
|
|
}
|
|
|
|
ihsize = bytestream_get_le32(&buf); /* more header size */
|
|
if(ihsize + 14 > hsize){
|
|
av_log(avctx, AV_LOG_ERROR, "invalid header size %d\n", hsize);
|
|
return -1;
|
|
}
|
|
|
|
if (ihsize == 40) {
|
|
width = bytestream_get_le32(&buf);
|
|
height = bytestream_get_le32(&buf);
|
|
} else if (ihsize == 12) {
|
|
width = bytestream_get_le16(&buf);
|
|
height = bytestream_get_le16(&buf);
|
|
} else {
|
|
av_log(avctx, AV_LOG_ERROR, "unsupported BMP file, patch welcome");
|
|
return -1;
|
|
}
|
|
|
|
if(bytestream_get_le16(&buf) != 1){ /* planes */
|
|
av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n");
|
|
return -1;
|
|
}
|
|
|
|
depth = bytestream_get_le16(&buf);
|
|
|
|
if(ihsize == 40)
|
|
comp = bytestream_get_le32(&buf);
|
|
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){
|
|
buf += 20;
|
|
rgb[0] = bytestream_get_le32(&buf);
|
|
rgb[1] = bytestream_get_le32(&buf);
|
|
rgb[2] = bytestream_get_le32(&buf);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
if(p->data[0])
|
|
avctx->release_buffer(avctx, p);
|
|
|
|
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 = buf0 + 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, avctx->width*(depth>>3));
|
|
buf += n;
|
|
ptr += linesize;
|
|
}
|
|
break;
|
|
case 16:
|
|
for(i = 0; i < avctx->height; i++){
|
|
const uint16_t *src = (const 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++){
|
|
const 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;
|
|
}
|
|
|
|
static av_cold int bmp_decode_end(AVCodecContext *avctx)
|
|
{
|
|
BMPContext* c = avctx->priv_data;
|
|
|
|
if (c->picture.data[0])
|
|
avctx->release_buffer(avctx, &c->picture);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec bmp_decoder = {
|
|
"bmp",
|
|
CODEC_TYPE_VIDEO,
|
|
CODEC_ID_BMP,
|
|
sizeof(BMPContext),
|
|
bmp_decode_init,
|
|
NULL,
|
|
bmp_decode_end,
|
|
bmp_decode_frame,
|
|
.long_name = NULL_IF_CONFIG_SMALL("BMP image"),
|
|
};
|