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https://git.ffmpeg.org/ffmpeg.git
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363 lines
10 KiB
C
363 lines
10 KiB
C
/*
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* BMP image format decoder
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* Copyright (c) 2005 Mans Rullgard
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* 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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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; 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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*/
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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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static av_cold int bmp_decode_init(AVCodecContext *avctx){
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BMPContext *s = avctx->priv_data;
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avcodec_get_frame_defaults((AVFrame*)&s->picture);
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avctx->coded_frame = (AVFrame*)&s->picture;
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return 0;
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}
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static int bmp_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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BMPContext *s = avctx->priv_data;
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AVFrame *picture = data;
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AVFrame *p = &s->picture;
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unsigned int fsize, hsize;
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int width, height;
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unsigned int depth;
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BiCompression comp;
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unsigned int ihsize;
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int i, j, n, linesize;
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uint32_t rgb[3];
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uint8_t *ptr;
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int dsize;
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const uint8_t *buf0 = buf;
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if(buf_size < 14){
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av_log(avctx, AV_LOG_ERROR, "buf size too small (%d)\n", buf_size);
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return -1;
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}
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if(bytestream_get_byte(&buf) != 'B' ||
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bytestream_get_byte(&buf) != 'M') {
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av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
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return -1;
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}
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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 */
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buf += 2; /* reserved2 */
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hsize = bytestream_get_le32(&buf); /* header size */
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ihsize = bytestream_get_le32(&buf); /* more header size */
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if(ihsize + 14 > hsize){
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av_log(avctx, AV_LOG_ERROR, "invalid header size %d\n", hsize);
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return -1;
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}
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/* sometimes file size is set to some headers size, set a real size in that case */
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if(fsize == 14 || fsize == ihsize + 14)
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fsize = buf_size - 2;
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if(fsize <= hsize){
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av_log(avctx, AV_LOG_ERROR, "declared file size is less than header size (%d < %d)\n",
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fsize, hsize);
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return -1;
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}
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switch(ihsize){
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case 40: // windib v3
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case 64: // OS/2 v2
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case 108: // windib v4
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case 124: // windib v5
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width = bytestream_get_le32(&buf);
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height = bytestream_get_le32(&buf);
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break;
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case 12: // OS/2 v1
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width = bytestream_get_le16(&buf);
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height = bytestream_get_le16(&buf);
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break;
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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");
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return -1;
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}
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depth = bytestream_get_le16(&buf);
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if(ihsize == 40)
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comp = bytestream_get_le32(&buf);
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else
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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);
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return -1;
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}
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if(comp == BMP_BITFIELDS){
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buf += 20;
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rgb[0] = bytestream_get_le32(&buf);
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rgb[1] = bytestream_get_le32(&buf);
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rgb[2] = bytestream_get_le32(&buf);
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}
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avctx->width = width;
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avctx->height = height > 0? height: -height;
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avctx->pix_fmt = PIX_FMT_NONE;
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switch(depth){
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case 32:
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if(comp == BMP_BITFIELDS){
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rgb[0] = (rgb[0] >> 15) & 3;
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rgb[1] = (rgb[1] >> 15) & 3;
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rgb[2] = (rgb[2] >> 15) & 3;
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if(rgb[0] + rgb[1] + rgb[2] != 3 ||
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rgb[0] == rgb[1] || rgb[0] == rgb[2] || rgb[1] == rgb[2]){
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break;
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}
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} else {
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rgb[0] = 2;
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rgb[1] = 1;
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rgb[2] = 0;
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}
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avctx->pix_fmt = PIX_FMT_BGR24;
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break;
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case 24:
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avctx->pix_fmt = PIX_FMT_BGR24;
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break;
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case 16:
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if(comp == BMP_RGB)
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avctx->pix_fmt = PIX_FMT_RGB555;
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if(comp == BMP_BITFIELDS)
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avctx->pix_fmt = rgb[1] == 0x07E0 ? PIX_FMT_RGB565 : PIX_FMT_RGB555;
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break;
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case 8:
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if(hsize - ihsize - 14 > 0)
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avctx->pix_fmt = PIX_FMT_PAL8;
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else
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avctx->pix_fmt = PIX_FMT_GRAY8;
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break;
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case 1:
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case 4:
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if(hsize - ihsize - 14 > 0){
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avctx->pix_fmt = PIX_FMT_PAL8;
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}else{
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av_log(avctx, AV_LOG_ERROR, "Unknown palette for %d-colour BMP\n", 1<<depth);
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return -1;
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}
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "depth %d not supported\n", depth);
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return -1;
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}
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if(avctx->pix_fmt == PIX_FMT_NONE){
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av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
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return -1;
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}
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if(p->data[0])
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avctx->release_buffer(avctx, p);
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p->reference = 0;
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if(avctx->get_buffer(avctx, p) < 0){
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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p->pict_type = AV_PICTURE_TYPE_I;
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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",
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dsize, n * avctx->height);
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return -1;
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}
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// RLE may skip decoding some picture areas, so blank picture before decoding
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if(comp == BMP_RLE4 || comp == BMP_RLE8)
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memset(p->data[0], 0, avctx->height * p->linesize[0]);
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if(depth == 4 || depth == 8)
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memset(p->data[1], 0, 1024);
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if(height > 0){
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ptr = p->data[0] + (avctx->height - 1) * p->linesize[0];
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linesize = -p->linesize[0];
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} else {
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ptr = p->data[0];
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linesize = p->linesize[0];
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}
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if(avctx->pix_fmt == PIX_FMT_PAL8){
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int colors = 1 << depth;
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if(ihsize >= 36){
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int t;
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buf = buf0 + 46;
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t = bytestream_get_le32(&buf);
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if(t < 0 || t > (1 << depth)){
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av_log(avctx, AV_LOG_ERROR, "Incorrect number of colors - %X for bitdepth %d\n", t, depth);
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}else if(t){
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colors = t;
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}
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}
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buf = buf0 + 14 + ihsize; //palette location
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if((hsize-ihsize-14) < (colors << 2)){ // OS/2 bitmap, 3 bytes per palette entry
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for(i = 0; i < colors; i++)
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((uint32_t*)p->data[1])[i] = bytestream_get_le24(&buf);
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}else{
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for(i = 0; i < colors; i++)
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((uint32_t*)p->data[1])[i] = bytestream_get_le32(&buf);
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}
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buf = buf0 + hsize;
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}
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if(comp == BMP_RLE4 || comp == BMP_RLE8){
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if(height < 0){
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p->data[0] += p->linesize[0] * (avctx->height - 1);
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p->linesize[0] = -p->linesize[0];
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}
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ff_msrle_decode(avctx, (AVPicture*)p, depth, buf, dsize);
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if(height < 0){
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p->data[0] += p->linesize[0] * (avctx->height - 1);
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p->linesize[0] = -p->linesize[0];
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}
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}else{
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switch(depth){
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case 1:
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for (i = 0; i < avctx->height; i++) {
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int j;
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for (j = 0; j < n; j++) {
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ptr[j*8+0] = buf[j] >> 7;
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ptr[j*8+1] = (buf[j] >> 6) & 1;
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ptr[j*8+2] = (buf[j] >> 5) & 1;
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ptr[j*8+3] = (buf[j] >> 4) & 1;
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ptr[j*8+4] = (buf[j] >> 3) & 1;
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ptr[j*8+5] = (buf[j] >> 2) & 1;
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ptr[j*8+6] = (buf[j] >> 1) & 1;
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ptr[j*8+7] = buf[j] & 1;
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}
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buf += n;
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ptr += linesize;
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}
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break;
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case 8:
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case 24:
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for(i = 0; i < avctx->height; i++){
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memcpy(ptr, buf, n);
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buf += n;
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ptr += linesize;
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}
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break;
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case 4:
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for(i = 0; i < avctx->height; i++){
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int j;
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for(j = 0; j < n; j++){
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ptr[j*2+0] = (buf[j] >> 4) & 0xF;
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ptr[j*2+1] = buf[j] & 0xF;
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}
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buf += n;
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ptr += linesize;
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}
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break;
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case 16:
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for(i = 0; i < avctx->height; i++){
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const uint16_t *src = (const uint16_t *) buf;
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uint16_t *dst = (uint16_t *) ptr;
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for(j = 0; j < avctx->width; j++)
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*dst++ = av_le2ne16(*src++);
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buf += n;
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ptr += linesize;
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}
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break;
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case 32:
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for(i = 0; i < avctx->height; i++){
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const uint8_t *src = buf;
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uint8_t *dst = ptr;
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for(j = 0; j < avctx->width; j++){
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dst[0] = src[rgb[2]];
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dst[1] = src[rgb[1]];
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dst[2] = src[rgb[0]];
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dst += 3;
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src += 4;
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}
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buf += n;
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ptr += linesize;
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}
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "BMP decoder is broken\n");
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return -1;
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}
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}
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*picture = s->picture;
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*data_size = sizeof(AVPicture);
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return buf_size;
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}
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static av_cold int bmp_decode_end(AVCodecContext *avctx)
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{
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BMPContext* c = avctx->priv_data;
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if (c->picture.data[0])
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avctx->release_buffer(avctx, &c->picture);
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return 0;
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}
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AVCodec ff_bmp_decoder = {
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.name = "bmp",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_BMP,
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.priv_data_size = sizeof(BMPContext),
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.init = bmp_decode_init,
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.close = bmp_decode_end,
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.decode = bmp_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("BMP image"),
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};
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