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/* |
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* BMP image format decoder |
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* Copyright (c) 2005 Mans Rullgard
* |
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* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* 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 |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/
#include "avcodec.h" |
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#include "bytestream.h" |
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#include "bmp.h" |
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#include "msrledec.h" |
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|
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static av_cold int bmp_decode_init(AVCodecContext *avctx){ |
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BMPContext *s = avctx->priv_data;
avcodec_get_frame_defaults((AVFrame*)&s->picture);
avctx->coded_frame = (AVFrame*)&s->picture;
return 0;
}
|
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static int bmp_decode_frame(AVCodecContext *avctx, |
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void *data, int *data_size, |
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const uint8_t *buf, int buf_size) |
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{
BMPContext *s = avctx->priv_data;
AVFrame *picture = data;
AVFrame *p = &s->picture;
unsigned int fsize, hsize;
int width, height;
unsigned int depth; |
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BiCompression comp; |
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unsigned int ihsize;
int i, j, n, linesize;
uint32_t rgb[3];
uint8_t *ptr;
int dsize; |
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const uint8_t *buf0 = buf; |
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if(buf_size < 14){
av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size);
return -1;
}
|
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if(bytestream_get_byte(&buf) != 'B' ||
bytestream_get_byte(&buf) != 'M') { |
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av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
return -1;
}
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fsize = bytestream_get_le32(&buf); |
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if(buf_size < fsize){ |
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av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d), trying to decode anyway\n", |
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buf_size, fsize); |
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fsize = buf_size; |
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}
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buf += 2; /* reserved1 */
buf += 2; /* reserved2 */ |
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|
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hsize = bytestream_get_le32(&buf); /* header size */
ihsize = bytestream_get_le32(&buf); /* more header size */ |
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if(ihsize + 14 > hsize){
av_log(avctx, AV_LOG_ERROR, "invalid header size %d\n", hsize);
return -1;
}
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/* 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;
}
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switch(ihsize){
case 40: // windib v3
case 64: // OS/2 v2
case 108: // windib v4
case 124: // windib v5 |
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width = bytestream_get_le32(&buf);
height = bytestream_get_le32(&buf); |
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break;
case 12: // OS/2 v1 |
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width = bytestream_get_le16(&buf);
height = bytestream_get_le16(&buf); |
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break;
default: |
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av_log(avctx, AV_LOG_ERROR, "unsupported BMP file, patch welcome\n"); |
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return -1;
} |
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|
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if(bytestream_get_le16(&buf) != 1){ /* planes */ |
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av_log(avctx, AV_LOG_ERROR, "invalid BMP header\n");
return -1;
}
|
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depth = bytestream_get_le16(&buf); |
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|
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if(ihsize == 40) |
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comp = bytestream_get_le32(&buf); |
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else
comp = BMP_RGB;
|
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if(comp != BMP_RGB && comp != BMP_BITFIELDS && comp != BMP_RLE4 && comp != BMP_RLE8){ |
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av_log(avctx, AV_LOG_ERROR, "BMP coding %d not supported\n", comp);
return -1;
}
if(comp == BMP_BITFIELDS){ |
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buf += 20;
rgb[0] = bytestream_get_le32(&buf);
rgb[1] = bytestream_get_le32(&buf);
rgb[2] = bytestream_get_le32(&buf); |
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}
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; |
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if(comp == BMP_BITFIELDS)
avctx->pix_fmt = rgb[1] == 0x07E0 ? PIX_FMT_RGB565 : PIX_FMT_RGB555;
break;
case 8:
if(hsize - ihsize - 14 > 0)
avctx->pix_fmt = PIX_FMT_PAL8;
else
avctx->pix_fmt = PIX_FMT_GRAY8;
break;
case 4:
if(hsize - ihsize - 14 > 0){
avctx->pix_fmt = PIX_FMT_PAL8;
}else{
av_log(avctx, AV_LOG_ERROR, "Unknown palette for 16-colour BMP\n");
return -1;
}
break;
case 1:
avctx->pix_fmt = PIX_FMT_MONOBLACK; |
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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;
}
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if(p->data[0])
avctx->release_buffer(avctx, p);
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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;
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buf = buf0 + hsize; |
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dsize = buf_size - hsize;
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/* Line size in file multiple of 4 */ |
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n = ((avctx->width * depth) / 8 + 3) & ~3; |
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if(n * avctx->height > dsize && comp != BMP_RLE4 && comp != BMP_RLE8){ |
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av_log(avctx, AV_LOG_ERROR, "not enough data (%d < %d)\n",
dsize, n * avctx->height);
return -1;
}
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// 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]);
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if(depth == 4 || depth == 8)
memset(p->data[1], 0, 1024);
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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];
}
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if(avctx->pix_fmt == PIX_FMT_PAL8){
buf = buf0 + 14 + ihsize; //palette location
if((hsize-ihsize-14)>>depth < 4){ // OS/2 bitmap, 3 bytes per palette entry
for(i = 0; i < (1 << depth); i++)
((uint32_t*)p->data[1])[i] = bytestream_get_le24(&buf);
}else{
for(i = 0; i < (1 << depth); i++)
((uint32_t*)p->data[1])[i] = bytestream_get_le32(&buf);
}
buf = buf0 + hsize;
} |
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if(comp == BMP_RLE4 || comp == BMP_RLE8){ |
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ff_msrle_decode(avctx, (AVPicture*)p, depth, buf, dsize); |
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}else{ |
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switch(depth){
case 1:
for(i = 0; i < avctx->height; i++){
memcpy(ptr, buf, n);
buf += n;
ptr += linesize; |
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} |
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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 8:
for(i = 0; i < avctx->height; i++){
memcpy(ptr, buf, avctx->width);
buf += n;
ptr += linesize;
}
break;
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; |
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|
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for(j = 0; j < avctx->width; j++)
*dst++ = le2me_16(*src++); |
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|
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buf += n;
ptr += linesize; |
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} |
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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; |
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} |
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} |
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*picture = s->picture;
*data_size = sizeof(AVPicture);
return buf_size;
}
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static av_cold int bmp_decode_end(AVCodecContext *avctx) |
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{
BMPContext* c = avctx->priv_data;
if (c->picture.data[0])
avctx->release_buffer(avctx, &c->picture);
return 0;
}
|
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AVCodec bmp_decoder = {
"bmp",
CODEC_TYPE_VIDEO,
CODEC_ID_BMP,
sizeof(BMPContext),
bmp_decode_init,
NULL, |
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bmp_decode_end, |
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bmp_decode_frame, |
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.long_name = NULL_IF_CONFIG_SMALL("BMP image"), |
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}; |