mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
362 lines
11 KiB
C
362 lines
11 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"
|
|
#include "msrledec.h"
|
|
|
|
static av_cold int bmp_decode_init(AVCodecContext *avctx){
|
|
BMPContext *s = avctx->priv_data;
|
|
|
|
avcodec_get_frame_defaults(&s->picture);
|
|
avctx->coded_frame = &s->picture;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bmp_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->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];
|
|
uint32_t alpha = 0;
|
|
uint8_t *ptr;
|
|
int dsize;
|
|
const uint8_t *buf0 = buf;
|
|
GetByteContext gb;
|
|
|
|
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), trying to decode anyway\n",
|
|
buf_size, fsize);
|
|
fsize = buf_size;
|
|
}
|
|
|
|
buf += 2; /* reserved1 */
|
|
buf += 2; /* reserved2 */
|
|
|
|
hsize = bytestream_get_le32(&buf); /* header size */
|
|
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;
|
|
}
|
|
|
|
/* sometimes file size is set to some headers size, set a real size in that case */
|
|
if(fsize == 14 || fsize == ihsize + 14)
|
|
fsize = buf_size - 2;
|
|
|
|
if(fsize <= hsize){
|
|
av_log(avctx, AV_LOG_ERROR, "declared file size is less than header size (%d < %d)\n",
|
|
fsize, hsize);
|
|
return -1;
|
|
}
|
|
|
|
switch(ihsize){
|
|
case 40: // windib
|
|
case 56: // windib v3
|
|
case 64: // OS/2 v2
|
|
case 108: // windib v4
|
|
case 124: // windib v5
|
|
width = bytestream_get_le32(&buf);
|
|
height = bytestream_get_le32(&buf);
|
|
break;
|
|
case 12: // OS/2 v1
|
|
width = bytestream_get_le16(&buf);
|
|
height = bytestream_get_le16(&buf);
|
|
break;
|
|
default:
|
|
av_log(avctx, AV_LOG_ERROR, "unsupported BMP file, patch welcome\n");
|
|
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 && comp != BMP_RLE4 && comp != BMP_RLE8){
|
|
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);
|
|
alpha = bytestream_get_le32(&buf);
|
|
}
|
|
|
|
avctx->width = width;
|
|
avctx->height = height > 0? height: -height;
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_NONE;
|
|
|
|
switch(depth){
|
|
case 32:
|
|
if(comp == BMP_BITFIELDS){
|
|
if (rgb[0] == 0xFF000000 && rgb[1] == 0x00FF0000 && rgb[2] == 0x0000FF00)
|
|
avctx->pix_fmt = alpha ? AV_PIX_FMT_ABGR : AV_PIX_FMT_0BGR;
|
|
else if (rgb[0] == 0x00FF0000 && rgb[1] == 0x0000FF00 && rgb[2] == 0x000000FF)
|
|
avctx->pix_fmt = alpha ? AV_PIX_FMT_BGRA : AV_PIX_FMT_BGR0;
|
|
else if (rgb[0] == 0x0000FF00 && rgb[1] == 0x00FF0000 && rgb[2] == 0xFF000000)
|
|
avctx->pix_fmt = alpha ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
|
|
else if (rgb[0] == 0x000000FF && rgb[1] == 0x0000FF00 && rgb[2] == 0x00FF0000)
|
|
avctx->pix_fmt = alpha ? AV_PIX_FMT_RGBA : AV_PIX_FMT_RGB0;
|
|
else {
|
|
av_log(avctx, AV_LOG_ERROR, "Unknown bitfields %0X %0X %0X\n", rgb[0], rgb[1], rgb[2]);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
} else {
|
|
avctx->pix_fmt = AV_PIX_FMT_BGRA;
|
|
}
|
|
break;
|
|
case 24:
|
|
avctx->pix_fmt = AV_PIX_FMT_BGR24;
|
|
break;
|
|
case 16:
|
|
if(comp == BMP_RGB)
|
|
avctx->pix_fmt = AV_PIX_FMT_RGB555;
|
|
else if (comp == BMP_BITFIELDS) {
|
|
if (rgb[0] == 0xF800 && rgb[1] == 0x07E0 && rgb[2] == 0x001F)
|
|
avctx->pix_fmt = AV_PIX_FMT_RGB565;
|
|
else if (rgb[0] == 0x7C00 && rgb[1] == 0x03E0 && rgb[2] == 0x001F)
|
|
avctx->pix_fmt = AV_PIX_FMT_RGB555;
|
|
else if (rgb[0] == 0x0F00 && rgb[1] == 0x00F0 && rgb[2] == 0x000F)
|
|
avctx->pix_fmt = AV_PIX_FMT_RGB444;
|
|
else {
|
|
av_log(avctx, AV_LOG_ERROR, "Unknown bitfields %0X %0X %0X\n", rgb[0], rgb[1], rgb[2]);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
}
|
|
break;
|
|
case 8:
|
|
if(hsize - ihsize - 14 > 0)
|
|
avctx->pix_fmt = AV_PIX_FMT_PAL8;
|
|
else
|
|
avctx->pix_fmt = AV_PIX_FMT_GRAY8;
|
|
break;
|
|
case 1:
|
|
case 4:
|
|
if(hsize - ihsize - 14 > 0){
|
|
avctx->pix_fmt = AV_PIX_FMT_PAL8;
|
|
}else{
|
|
av_log(avctx, AV_LOG_ERROR, "Unknown palette for %d-colour BMP\n", 1<<depth);
|
|
return -1;
|
|
}
|
|
break;
|
|
default:
|
|
av_log(avctx, AV_LOG_ERROR, "depth %d not supported\n", depth);
|
|
return -1;
|
|
}
|
|
|
|
if(avctx->pix_fmt == AV_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 = AV_PICTURE_TYPE_I;
|
|
p->key_frame = 1;
|
|
|
|
buf = buf0 + hsize;
|
|
dsize = buf_size - hsize;
|
|
|
|
/* Line size in file multiple of 4 */
|
|
n = ((avctx->width * depth + 31) / 8) & ~3;
|
|
|
|
if(n * avctx->height > dsize && comp != BMP_RLE4 && comp != BMP_RLE8){
|
|
av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
|
|
dsize, n * avctx->height);
|
|
return -1;
|
|
}
|
|
|
|
// RLE may skip decoding some picture areas, so blank picture before decoding
|
|
if(comp == BMP_RLE4 || comp == BMP_RLE8)
|
|
memset(p->data[0], 0, avctx->height * p->linesize[0]);
|
|
|
|
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];
|
|
}
|
|
|
|
if(avctx->pix_fmt == AV_PIX_FMT_PAL8){
|
|
int colors = 1 << depth;
|
|
|
|
memset(p->data[1], 0, 1024);
|
|
|
|
if(ihsize >= 36){
|
|
int t;
|
|
buf = buf0 + 46;
|
|
t = bytestream_get_le32(&buf);
|
|
if(t < 0 || t > (1 << depth)){
|
|
av_log(avctx, AV_LOG_ERROR, "Incorrect number of colors - %X for bitdepth %d\n", t, depth);
|
|
}else if(t){
|
|
colors = t;
|
|
}
|
|
}
|
|
buf = buf0 + 14 + ihsize; //palette location
|
|
if((hsize-ihsize-14) < (colors << 2)){ // OS/2 bitmap, 3 bytes per palette entry
|
|
for(i = 0; i < colors; i++)
|
|
((uint32_t*)p->data[1])[i] = (0xff<<24) | bytestream_get_le24(&buf);
|
|
}else{
|
|
for(i = 0; i < colors; i++)
|
|
((uint32_t*)p->data[1])[i] = 0xFFU << 24 | bytestream_get_le32(&buf);
|
|
}
|
|
buf = buf0 + hsize;
|
|
}
|
|
if(comp == BMP_RLE4 || comp == BMP_RLE8){
|
|
if(height < 0){
|
|
p->data[0] += p->linesize[0] * (avctx->height - 1);
|
|
p->linesize[0] = -p->linesize[0];
|
|
}
|
|
bytestream2_init(&gb, buf, dsize);
|
|
ff_msrle_decode(avctx, (AVPicture*)p, depth, &gb);
|
|
if(height < 0){
|
|
p->data[0] += p->linesize[0] * (avctx->height - 1);
|
|
p->linesize[0] = -p->linesize[0];
|
|
}
|
|
}else{
|
|
switch(depth){
|
|
case 1:
|
|
for (i = 0; i < avctx->height; i++) {
|
|
int j;
|
|
for (j = 0; j < n; j++) {
|
|
ptr[j*8+0] = buf[j] >> 7;
|
|
ptr[j*8+1] = (buf[j] >> 6) & 1;
|
|
ptr[j*8+2] = (buf[j] >> 5) & 1;
|
|
ptr[j*8+3] = (buf[j] >> 4) & 1;
|
|
ptr[j*8+4] = (buf[j] >> 3) & 1;
|
|
ptr[j*8+5] = (buf[j] >> 2) & 1;
|
|
ptr[j*8+6] = (buf[j] >> 1) & 1;
|
|
ptr[j*8+7] = buf[j] & 1;
|
|
}
|
|
buf += n;
|
|
ptr += linesize;
|
|
}
|
|
break;
|
|
case 8:
|
|
case 24:
|
|
case 32:
|
|
for(i = 0; i < avctx->height; i++){
|
|
memcpy(ptr, buf, n);
|
|
buf += n;
|
|
ptr += linesize;
|
|
}
|
|
break;
|
|
case 4:
|
|
for(i = 0; i < avctx->height; i++){
|
|
int j;
|
|
for(j = 0; j < n; j++){
|
|
ptr[j*2+0] = (buf[j] >> 4) & 0xF;
|
|
ptr[j*2+1] = buf[j] & 0xF;
|
|
}
|
|
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++ = av_le2ne16(*src++);
|
|
|
|
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 ff_bmp_decoder = {
|
|
.name = "bmp",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_BMP,
|
|
.priv_data_size = sizeof(BMPContext),
|
|
.init = bmp_decode_init,
|
|
.close = bmp_decode_end,
|
|
.decode = bmp_decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("BMP (Windows and OS/2 bitmap)"),
|
|
};
|